WO2018230589A1 - Spray gun - Google Patents

Abstract

This spray gun comprises a gun body and a baffle ring that can be attached to and detached from the gun body. The gun body comprises: a gun head part provided on the tip end side, the gun head part having a first inner diameter; a rib part having a second inner diameter that is less than the first inner diameter, the rib part being integrally formed with the gun head part so as to be positioned rearward of the gun head part; and a gas supply hole formed in a part in the circumferential direction of the rib part, the gas supply hole supplying a gas toward the gun head part. The baffle ring comprises a base part that can be attached to and detached from the rib part by screwing, a flange part having a first outer diameter that is greater than the outer diameter of the base part, and a projecting part that projects farther forward than the tip end of the gun head part. A gap is formed between the inner circumferential wall of the gun head part and the outer circumferential wall of the flange part.

Description

Spray gun

The present invention relates to a spray gun.

Conventionally, a spray gun having a head and into which a liquid and a compressed gas are introduced is generally known.

For example, the spray gun disclosed in Patent Document 1 below is a gas rectified by a gap between the outer periphery of the nozzle passage gas passage and the main body baffle plate integrally formed at the tip of the gun main body in order to obtain a normal pattern with a stable spray pattern. To the side gas channel at the corner of the gas cap, and the side gas channel adopts a rectifying structure having a hole shape that is gradually narrowed from the base toward the side gas hole Yes.

Japanese Patent Laid-Open No. 9-267060

However, in the spray gun described in Patent Document 1, the gas is rectified by the baffle plate. However, since the baffle plate is integrally formed with the gun body, the space surrounded by the baffle plate and the gun body is washed well. There was a problem that it was not possible.

The present invention has been made in view of the above problems, and an object thereof is to provide a spray gun that is easy to clean while maintaining gas rectification.

In order to solve the above problems, a spray gun according to the present invention is a spray gun including a gun body and a baffle ring that can be attached to and detached from the gun body. The gun body is provided on a distal end side and has a first inner diameter. A cylindrical gun head portion having a second inner diameter smaller than the first inner diameter, and is integrally formed with the gun head portion so as to be located rearward of the gun head portion, and an internal thread is provided on an inner peripheral wall A cylindrical rib portion and a gas supply hole formed in a part of the rib portion in the circumferential direction for supplying gas to the gun head portion side, and the baffle ring has an internal thread on the outer peripheral wall. And a cylindrical base part that can be attached to and detached from the rib part by screwing the male screw and the female screw, and an outer diameter of the base part. Than A ring-shaped flange portion having a large first outer diameter; and a projecting portion integrally formed with the flange portion and projecting forward from the tip of the gun head portion; and an inner peripheral wall of the gun head portion and the flange portion A gap is formed between the outer peripheral wall and the baffle ring can be attached to and detached from the gun body when the baffle ring is rotated in a state where the protruding portion is gripped.

It is a schematic diagram of the whole spray gun of the embodiment concerning the present invention. It is a disassembled perspective view of the principal part of the spray gun of embodiment which concerns on this invention. It is an exploded sectional view of the principal part of the spray gun of the embodiment concerning the present invention. It is sectional drawing of the principal part of the spray gun of embodiment which concerns on this invention.

Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as “embodiments”) will be described in detail with reference to the accompanying drawings. Note that the same number is assigned to the same element throughout the description of the embodiment.

Further, in the following description, the expressions “front end” and “front” represent the position and direction on the side close to the injection port for injecting liquid in each member or the like, and conversely “rear end” and “rear” Is used to represent the position and direction on the side far from the ejection port for ejecting the liquid.

Hereinafter, a spray gun 1 according to an embodiment of the present invention will be described in detail with reference to FIGS.

[Overall structure of spray gun]
FIG. 1 is a schematic view showing the entire spray gun 1 according to an embodiment of the present invention.

Hereinafter, the overall configuration of the spray gun 1 according to the embodiment of the present invention will be described with reference to FIG.

The spray gun 1 according to the embodiment of the present invention mainly includes a gun body 2, a baffle ring 3, a liquid nozzle 4, a packing 5, a gas cap 6 and a cover 7, as shown in FIG. That is, the gun body 2, the baffle ring 3, the liquid nozzle 4, the packing 5, the gas cap 6 and the cover 7 constitute the main part of the spray gun 1.

The configuration of the main part of the spray gun 1 will be described later with reference to FIGS.

Further, as shown in FIG. 1, the spray gun 1 according to the embodiment of the present invention is connected to a trigger 11 and opens / closes a liquid injection port 4 a at the tip of the liquid nozzle 4 by operating the trigger 11. And a needle valve spring 12 that constantly urges the needle valve 10 toward the liquid jet port 4a.

Therefore, when the trigger 11 is not pulled, the needle valve 10 is urged by the needle valve spring 12 toward the liquid ejection port 4 a at the tip of the liquid nozzle 4. For this reason, the tip of the needle valve 10 is inserted into the liquid jet 4 a at the tip of the liquid nozzle 4, and the liquid jet 4 a is blocked by the tip of the needle valve 10.

On the other hand, when the trigger 11 is pulled, the needle valve 10 moves to the rear end side in conjunction with the trigger 11, and the tip of the needle valve 10 comes out of the liquid jet 4 a at the tip of the liquid nozzle 4. When the liquid is supplied to the liquid ejection port 4a, the liquid is ejected from the liquid ejection port 4a.

Further, in conjunction with the trigger 11, a gas valve 13 for opening and closing the gas flow path is provided. Therefore, when the needle valve 10 is urged toward the liquid injection port 4a at the tip of the liquid nozzle 4 without operating the trigger 11, the flow of gas (gas) supplied from the gas supply port 14 is stopped. It is like that.

When the trigger 11 is pulled, the gas valve 13 first moves to the rear end side, the gas flow path is opened, the gas is supplied to the front end 23 of the gas flow path, and the gas supplied to the front end 23 of the gas flow path is Injected from an annular gap formed between the atomizing gas blowing hole 61a, which will be described later, and the outer diameter of the tip of the liquid nozzle 4 on the liquid jet port 4a side, the auxiliary gas blowing hole 61b and the pattern adjusting gas blowing hole 62a. Subsequently, when the trigger 11 is further pulled, when the liquid is supplied to the liquid ejection port 4a, the liquid is ejected from the liquid ejection port 4a.

Note that the gas supply amount to the pattern adjustment gas blowout holes 62 a can be adjusted by the pattern gas adjustment knob 15.

Specifically, when the pattern gas adjusting knob 15 is rotated, the opening of the gas flow path to the pattern adjusting gas blowing hole 62a is changed by the gas adjusting needle 8, and the gas is supplied to the pattern adjusting gas blowing hole 62a. It can be adjusted up to the fully closed position.

Further, an overall gas adjustment knob 16 is provided in the vicinity of the gas supply port 14, and by adjusting the overall gas adjustment knob 16, it is sent to a gas valve 13 for opening and closing the gas flow path. It is possible to adjust the amount of gas.

Here, at the time of use, a liquid supply pipe (not shown) is connected to the liquid supply port 17, and the liquid is supplied from the liquid supply port 17 to the gap between the liquid nozzle 4 and the needle valve 10.

Further, since a gas supply pipe (not shown) is connected to the gas supply port 14 and gas is supplied to the gas valve 13, when the trigger 11 is pulled, the atomization gas blowout hole is formed. Gas is jetted from the annular gap formed between 61a and the outer diameter of the tip of the liquid nozzle 4 on the liquid jet port 4a side, the auxiliary gas blow hole 61b and the pattern adjusting gas blow hole 62a, and then the liquid nozzle 4 Liquid is ejected from the liquid ejection port 4a at the tip.

The jetted liquid is atomized (misted) by the gas jetted from an annular gap formed between the atomizing gas blowout hole 61a and the tip of the liquid nozzle 4 on the liquid jet port 4a side at the same time when jetted. The atomized liquid which has been atomized (atomized) with the gas jetted from the pattern adjusting gas blowing holes 62a is adjusted to an elliptical pattern, and the auxiliary gas blowing holes 61b are obtained. Finely correct the pattern with the gas injected from

Then, when the pulling of the trigger 11 is stopped, the ejection of the liquid is stopped, and then, an annular gap formed between the atomizing gas blowing hole 61a and the outer diameter of the liquid nozzle 4 on the tip side of the liquid nozzle 4a. Then, gas injection from the auxiliary gas blowing holes 61b and the pattern adjusting gas blowing holes 62a is also stopped.

[Configuration of main parts of spray gun]
Next, the configuration of the main part of the spray gun 1 according to the embodiment of the present invention will be described in detail with reference to FIGS.

2 is an exploded perspective view of the main part of the spray gun 1 according to the embodiment of the present invention, and FIG. 3 is a cross-sectional view of the main part of the spray gun 1 of the embodiment of the present invention disassembled. FIG. 4 is a sectional view showing the main part of the spray gun 1 according to the embodiment of the present invention.

3 and 4, the left side is the front and the right side is the rear.

As shown in FIGS. 2 to 4, the gun body 2 is provided on the distal end side, and has a cylindrical gun head portion 21 having a first inner diameter d1 and a second inner diameter d2 smaller than the first inner diameter d1. It is formed between the cylindrical rib portion 22 located on the rear side of the portion 21, and the gas outlet hole 61 a for atomizing the gas from the gas supply port 14 and the outer diameter of the liquid nozzle 4 at the tip of the liquid nozzle 4 side. The annular gap, the tip 23 of the gas flow path for supplying the auxiliary gas blowing holes 61b and the pattern adjusting gas blowing holes 62a, the nozzle connecting portion 24 located on the rear side of the gun head portion 21, and the gas flow A gas branch for supplying the gas from the tip 23 of the passage to the annular gap formed between the atomizing gas blowing hole 61a and the outer diameter of the liquid nozzle 4 at the tip of the liquid jet port 4a and the auxiliary gas blowing hole 61b. Groove 25 is provided.

The gun head portion 21 is provided with a male screw 21a on the outer peripheral wall along a circumferential direction centering on the axis O (hereinafter referred to as a circumferential direction). The male screw 21a is screwed with a female screw 71 of the cover 7 described later. It is configured to be compatible.

The rib portion 22 is integrally formed with the gun head portion 21, and a female screw 22 a is provided on the inner peripheral wall along the circumferential direction. The female screw 22 a can be screwed with a male screw 31 a of a baffle ring 3 to be described later. It is configured.

A taper 22b is provided on the inner peripheral wall of the rib portion 22 along the circumferential direction. The taper 22b is located in front of the female screw 22a and can be engaged with a taper 31b of a baffle ring 3 described later. It is configured.

Furthermore, a gas supply hole 22c is provided in a part of the circumferential direction of the rib portion 22 so as to penetrate the rib portion 22 along the extending direction of the axis O (hereinafter referred to as the axial direction). Since the gas supply hole 22c communicates the space on the gun head portion 21 side with the tip 23 of the gas channel, gas from the tip 23 of the gas channel can be supplied to the gun head portion 21 side (see FIG. 4).

The nozzle connecting portion 24 is a cylindrical member that can be connected to the liquid nozzle 4, and is provided so as to penetrate the opening of the rib portion 22.

Also, the nozzle connecting portion 24 is preferably made of a corrosion-resistant material such as stainless steel in order to come into contact with a liquid such as paint.

The inner peripheral wall of the nozzle connecting portion 24 is provided with a female screw 24a along the circumferential direction, and the female screw 24a is configured to be screwable with a male screw 41a of the liquid nozzle 4 described later.

Further, a taper 24b (first taper) is provided along the circumferential direction on the inner peripheral wall of the nozzle connecting portion 24. The taper 24b is located behind the female screw 24a and is a liquid nozzle described later. 4 taper 41b is configured to be engageable.

As shown in FIG. 4, the gas branch groove 25 communicates the distal end 23 of the gas flow path with a gas branch flow path to be described later. Can be supplied.

As shown in FIGS. 3 and 4, the baffle ring 3 includes a cylindrical base portion 31 that can be attached to and detached from the rib portion 22 by screwing, and a first outer diameter D1 that is larger than the outer diameter of the base portion 31. The ring-shaped flange part 32 which has this, and the cylindrical protrusion part 33 which protrudes ahead from the flange part 32 are provided.

The base portion 31 has a male screw 31a for screwing with the female screw 22a on the outer peripheral wall, so that the base portion 31 can be attached to and detached from the rib portion 22 by screwing the male screw 31a with the female screw 22a of the gun body 2. It becomes.

Further, the outer peripheral wall of the base portion 31 is provided with a taper 31b for engaging with the taper 22b of the gun body 2 so as to be positioned in front of the male screw 31a.

The flange portion 32 is integrally formed with the base portion 31 so as to be positioned in front of the base portion 31, and has a fourth inner diameter d4 larger than the inner diameter of the base portion 31.

In the state where the base portion 31 is attached to the rib portion 22 of the gun body 2, the space surrounded by the baffle ring 3, the gun head portion 21 and the rib portion 22 becomes the gas rectifying chamber 9, as shown in FIG. A gap is formed between the outer peripheral wall of the flange portion 32 and the inner peripheral wall on the distal end side of the gun head portion 21 facing it.

As described above, the gas rectifying chamber 9 corresponding to the space on the gun head portion 21 side communicates with the tip 23 of the gas flow path via the gas supply hole 22c. As a result, the gas supplied from the distal end 23 of the gas flow path passes through the gap formed between the outer peripheral wall of the flange portion 32 and the inner peripheral wall on the distal end side of the gun head portion 21 via the gas rectifying chamber 9. By doing so, it is rectified.

The protruding portion 33 is integrally formed with the flange portion 32 so as to protrude forward from the flange portion 32, and has a third inner diameter d3 larger than the fourth inner diameter d4 of the flange portion 32.

In addition, the packing 5 is disposed on the inner peripheral wall of the projecting portion 33 so as to be able to come into contact therewith. Then, on the rear side of the inner peripheral wall of the protrusion 33, a flange portion 32 having a fourth inner diameter d4 smaller than the third inner diameter d3 of the protrusion 33 is formed so as to be adjacent to the protrusion 33. The backward movement of the packing 5 is restricted.

That is, when the packing 5 moves rearward along the inner peripheral wall of the projecting portion 33, the rearward movement of the packing 5 is restricted by contacting the inner edge side of the flange portion 32.

Further, as shown in FIG. 4, the protruding portion 33 protrudes forward from the tip of the gun head portion 21.

Furthermore, in this embodiment, although the protrusion part 33 is comprised from a hexagon part (refer FIG. 2), it is not limited to this, For example, even if a pair of parallel planes are formed in an outer peripheral wall In this case, the baffle ring 3 only needs to be rotatable in a state where the pair of parallel planes of the projecting portion 33 are gripped by a standard tool or the like.

Thus, the baffle ring 3 can be easily attached to and detached from the gun body 2 when the projection 33 is rotated with the projection 33 held by a standard tool or the like, and the gas rectification blocked by the baffle ring 3 is achieved. The space of the chamber 9 can be easily cleaned.

The liquid nozzle 4 is attached to the nozzle connecting portion 24 so as to penetrate the opening of the base portion 31, as shown in FIGS.

The liquid nozzle 4 includes a nozzle body 41 that can eject liquid and can be attached to the nozzle connecting portion 24, a baffle plate 42 that is provided on the outer peripheral wall of the nozzle body 41 along the circumferential direction, and a baffle plate 42. Has a diameter-enlarged portion 43 provided along the circumferential direction on the outer peripheral wall of the nozzle body 41 so as to be positioned on the front side.

The nozzle main body 41 extends along the axial direction, has an outer diameter smaller than the inner diameter of the base portion 31, and is screwed into the outer peripheral wall on the rear end side with the female screw 24a of the nozzle connecting portion 24. A male screw 41a is provided.

Thereby, the nozzle body 41 can be attached to and detached from the nozzle connecting portion 24 by screwing so as to penetrate the opening of the base portion 31.

A gas branch channel that communicates with the tip 23 of the gas channel is formed between the outer peripheral wall of the nozzle body 41 and the base portion 31 of the baffle ring 3 and the inner peripheral wall of the flange portion 32 facing each other. Yes.

The outer peripheral wall of the nozzle body 41 is provided with a taper 41b (second taper) for engaging with the taper 24b of the nozzle connecting portion 24 so as to be positioned on the rear side of the male screw 41a.

For this reason, in the state where the nozzle body 41 is attached to the nozzle connecting portion 24 by screwing, liquid leakage of paint or the like from the connecting portion between the nozzle main body 41 and the nozzle connecting portion 24 is caused by the engagement between the taper 24b and the taper 41b. Can be reliably prevented.

The location where the liquid nozzle 4 and the gun body 2 are engaged is only the location where the taper 24b of the nozzle connecting portion 24 and the taper 41b of the nozzle body 41 are engaged.

The baffle plate 42 is integrally formed with the nozzle main body 41 so as to be located on the rear side of the enlarged diameter portion 43, and is larger than the outer diameter of the nozzle main body 41 and larger than the inner diameter of the base portion 31 of the baffle ring 3. Has a small outer diameter.

As shown in FIG. 4, in the gas branch flow path, a gap for rectifying the gas is formed between the outer peripheral wall of the baffle plate 42 and the inner peripheral wall of the base portion 31 facing the baffle plate 42.

As a result, the gas supplied from the tip 23 of the gas channel enters the gas branch channel via the gas branch groove 25 separately from the gas supply hole 22 c, and the inner wall of the baffle plate 42 and the base portion 31. Rectification is achieved by passing through a gap formed between the peripheral wall and the peripheral wall.

The enlarged diameter portion 43 includes a packing disposing portion 43a having a second outer diameter D2 smaller than the third inner diameter d3 of the protrusion 33, and a third outer portion larger than the second outer diameter D2 and smaller than the third inner diameter d3. A movement restricting portion 43b that has a diameter D3, is located on the front side of the packing disposing portion 43a and is adjacent to the packing disposing portion 43a, and has an outer diameter larger than the third outer diameter D3. And it has the front side part 43c provided so that it might be located ahead rather than the movement control part 43b, and the some through-hole 43d which penetrates the enlarged diameter part 43 along an axial direction.

The packing 5 is disposed on the outer peripheral wall of the packing disposing portion 43a so as to be in contact therewith. And the movement regulation which has the 3rd outer diameter D3 larger than the 2nd outer diameter D2 of the packing arrangement | positioning part 43a so that it may adjoin the packing arrangement | positioning part 43a in the front side of the outer peripheral wall of the packing arrangement | positioning part 43a. By forming the portion 43b, the forward movement of the packing 5 is restricted.

That is, when the packing 5 moves forward along the outer peripheral wall of the packing arrangement portion 43a, the forward movement of the packing 5 is restricted by coming into contact with the movement restricting portion 43b.

A taper 43e that can be engaged with a ring-shaped taper 63 of the gas cap 6 to be described later is provided on the front end side of the front side portion 43c.

The plurality of through-holes 43d have an annular gap formed between the atomizing gas blowing hole 61a and the outer diameter of the liquid nozzle 4 side tip of the liquid nozzle 4 through the gas branch passage. These are supplied to the auxiliary gas blowing holes 61b and are provided at predetermined intervals in the circumferential direction.

As shown in FIG. 4, the ring-shaped packing 5 is disposed between the inner peripheral wall of the projecting portion 33 of the baffle ring 3 and the outer peripheral wall of the packing disposing portion 43 a of the liquid nozzle 4 opposed thereto.

Specifically, the packing 5 is arranged along the circumferential direction so that the outer peripheral wall and the inner peripheral wall thereof are in contact with the inner peripheral wall of the protruding portion 33 and the outer peripheral wall of the packing disposing portion 43a, respectively. It arrange | positions between the arrangement | positioning parts 43a.

In other words, the enlarged diameter portion 43 of the liquid nozzle 4 is held by the baffle ring 3 via the packing 5.

For this reason, the packing 5 can be easily attached to and detached from the inner peripheral wall of the protruding portion 33 without using a dedicated tool.

The packing 5 is sandwiched between the movement restricting portion 43b and the flange portion 32 so as not to contact at least one of the movement restricting portion 43b and the flange portion 32 in the front-rear direction (axial direction). .

That is, the distance r from the rear end surface of the movement restricting portion 43b to the front end surface of the flange portion 32 is formed larger than the width t of the packing 5 in the front-rear direction (axial direction). For this reason, the packing 5 is not pressed or deformed by tightening the male screw 41a of the nozzle body 41 and the female screw 24a of the nozzle connecting portion 24 in the front-rear direction (axial direction), and is reliable as a sealing material. Can be improved.

In this embodiment, the packing 5 is sandwiched between the movement restricting portion 43b and the flange portion 32 so as not to contact the flange portion 32 while contacting the movement restricting portion 43b in the front-rear direction (axial direction). (See FIG. 4).

Further, the packing 5 has a groove 5a formed along a circumferential direction on a surface (rear end surface) facing the flange portion 32.

For this reason, the gas supplied from the tip 23 of the gas flow path via the gas branch flow path enters the groove 5a, thereby pressing the inner peripheral wall of the packing 5 against the outer peripheral wall of the packing disposing portion 43a. Since the outer peripheral wall of the packing 5 is pressed against the inner peripheral wall of the protrusion 33, the sealing effect of the packing 5 can be enhanced.

As described above, the liquid nozzle 4 uses the taper 41 b at the connecting portion with the nozzle connecting portion 24 and uses the packing 5 at the joint portion with the protruding portion 33 of the baffle ring 3, so the connecting portion with the nozzle connecting portion 24 is used. And the reliability of a sealing effect can be improved compared with what uses a taper in all the joint parts with the baffle ring 3. FIG.

That is, in the liquid nozzle 4, when a taper is used for both the connecting portion with the nozzle connecting portion 24 and the joint portion with the baffle ring 3, the male screw 41 a of the nozzle body 41 and the female screw 24 a of the nozzle connecting portion 24 are tightened. Even if the taper at one location is successfully engaged due to the adjustment, there is a risk that the taper at the other location may not be properly engaged. On the other hand, in this embodiment, as described above, the combination of the taper 41b and the packing 5 By using this, it is possible to eliminate the problem that the taper does not engage well when the liquid nozzle 4 is fixed.

In addition, when using a taper for both the connecting portion with the nozzle connecting portion 24 and the joint portion with the baffle ring 3, high manufacturing accuracy for each component is required to engage the two tapers together. In this embodiment, since it is not necessary to engage two tapers together, high-precision manufacturing is not required, and it is easy to manufacture each component constituting the spray gun 1.

As shown in FIGS. 2 and 3, the gas cap 6 includes a cap body 61, a pair of corner portions 62 provided on the cap body 61, and a ring-shaped taper 63 that protrudes rearward from the back surface of the cap body 61. Have

The cap body 61 includes an atomizing gas blowing hole 61a and a plurality of auxiliary gas blowing holes 61b for discharging the gas supplied through the plurality of through holes 43d of the nozzle body 41 to the outside.

The pair of corner portions 62 pass the gas supplied through the gap formed between the outer peripheral wall of the flange portion 32 of the baffle ring 3 and the inner peripheral wall on the distal end side of the gun head portion 21 of the gun body 2 to the outside. A plurality of pattern adjusting gas blowing holes 62a for discharging are provided.

As described above, the ring-shaped taper 63 is for engaging with the taper 43e of the diameter-expanded portion 43 of the liquid nozzle 4, and as shown in FIG. 43 is engaged with the taper 43e through the plurality of through holes 43d of the nozzle body 41, and between the outer peripheral wall of the flange portion 32 and the inner peripheral wall on the tip side of the gun head portion 21. The gas supplied through the formed gap does not mix with each other, and is reliably formed between the atomizing gas blowing hole 61a and the outer diameter of the liquid nozzle 4 at the tip of the liquid injection port 4a. The gas is discharged from the gap, the plurality of auxiliary gas blowing holes 61b, and the plurality of pattern adjusting gas blowing holes 62a.

The cover 7 is provided on the inner peripheral wall on the rear end side and is provided with a female screw 71 for screwing with the male screw 21a of the gun body 2 and a packing arrangement groove provided on the inner peripheral wall so as to be positioned in front of the female screw 71. 72 and a cover packing 73 fitted in the packing disposition groove 72 and capable of contacting the outer peripheral wall of the gun head portion 21.

As shown in FIG. 4, the cover packing 73 is disposed between the packing disposition groove 72 of the cover 7 and the outer peripheral wall of the gun head portion 21. The gas supplied through the gap formed between the outer peripheral wall and the inner peripheral wall on the distal end side of the gun head portion 21 is more reliably discharged from the plurality of pattern adjusting gas blowing holes 62a.

(1) A spray gun according to an embodiment is a spray gun including a gun body and a baffle ring that can be attached to and detached from the gun body. The gun body is provided on a distal end side and has a first inner diameter. A cylindrical gun head having a second gun inner diameter smaller than the first inner diameter, integrally formed with the gun head so as to be located rearward of the gun head, and provided with an internal thread on the inner peripheral wall And a gas supply hole for supplying a gas to the gun head portion side, and the baffle ring is screwed to the outer peripheral wall with the female screw. And a cylindrical base portion that can be attached to and detached from the rib portion by screwing between the male screw and the female screw, and is integrally formed with the base portion, and is larger than the outer diameter of the base portion. 1st outside A ring-shaped flange portion having a projecting portion that is integrally formed with the flange portion and projects forward from the tip of the gun head portion, and between the inner peripheral wall of the gun head portion and the outer peripheral wall of the flange portion A gap is formed in the gun body, and the baffle ring can be attached to and detached from the gun body when the baffle ring is rotated in a state where the protrusion is held.

According to this embodiment, since the baffle ring can be attached to and detached from the gun body by rotating while gripping the protruding portion of the baffle ring, the space blocked by the baffle ring can be easily washed. Further, the gas to be supplied can be rectified by passing it through a gap formed between the outer peripheral wall of the flange portion and the inner peripheral wall on the distal end side of the gun head portion.

(2) In the configuration of the above (1), the gun body has a nozzle connecting portion that is located on the rear side of the gun head portion and that penetrates the opening of the rib portion, and the spray gun Further includes a liquid nozzle attached to the nozzle connecting portion by screwing so as to pass through the opening of the base portion, and the protruding portion of the baffle ring has a third inner diameter larger than the inner diameter of the flange portion The flange portion has a fourth inner diameter that is smaller than the third inner diameter, the liquid nozzle is capable of injecting liquid, and a cylindrical nozzle body attached to the nozzle connecting portion; An enlarged diameter portion provided along the circumferential direction on the outer peripheral wall of the nozzle body, the enlarged diameter portion having a second outer diameter smaller than the third inner diameter, and the second OD And a movement restricting portion that is located on the front side of the packing arrangement portion and adjacent to the packing arrangement portion. A ring-shaped packing is disposed between the outer peripheral wall and the inner peripheral wall of the protruding portion so as to contact the outer peripheral wall of the packing mounting portion and the inner peripheral wall of the protruding portion. In this case, it is preferable to be sandwiched between the movement restricting portion and the flange portion so as not to contact at least one of the movement restricting portion and the flange portion.

According to this configuration, the packing improves the reliability as a sealing material in the front-rear direction (axial direction) without being pressed or deformed by tightening the liquid nozzle and the nozzle connecting portion of the gun body. Can be made.

(3) In the configuration of (2), the nozzle coupling portion has a first taper, and the nozzle body has a second taper for engaging with the first taper, and the liquid nozzle It is preferable that the location where the gun body engages is only the location where the first taper and the second taper engage.

According to this embodiment, the liquid nozzle uses a taper at a connection portion with the nozzle connection portion and uses a packing at a joint portion with the protruding portion of the baffle ring, so the connection portion with the nozzle connection portion and the baffle ring The reliability of the sealing effect can be improved as compared with a case where a taper is used at any of the joint portions. That is, in the liquid nozzle, when using a taper at both the connection point with the nozzle connection part and the joint part with the baffle ring, the taper at one point can be engaged well by tightening the nozzle body and the nozzle connection part. Even if it does, there exists a possibility that the taper of another location may not engage well. On the other hand, in this embodiment, by using a combination of a taper and packing, it is possible to solve the problem that the taper does not engage well when the liquid nozzle is fixed.

In addition, when using a taper for both the connecting portion with the nozzle connecting portion and the joint portion with the baffle ring, high manufacturing accuracy for each component is required to engage the two tapers together. In this case, since it is not necessary to engage the two tapers together, high-precision manufacturing is not required, and it becomes easy to manufacture each component constituting the spray gun.

(4) In any one of the constitutions (1) to (3), it is preferable that the protruding portion has a pair of parallel planes formed on the outer peripheral wall. In this case, the baffle ring can rotate with a pair of parallel planes of the protrusions held by a standard tool or the like, and can be easily attached to and detached from the gun body.

According to the above embodiment, it is possible to provide a spray gun that is easy to clean while maintaining gas rectification by the flange portion corresponding to the baffle plate.

As mentioned above, although this invention was demonstrated using embodiment, it cannot be overemphasized that the technical scope of this invention is not limited to the range of the invention as described in said embodiment, A various change or It will be apparent to those skilled in the art that improvements can be made. Further, it is apparent from the scope of the claims that embodiments with such changes or improvements can also be included in the technical scope of the present invention.

This application claims priority based on Japanese Patent Application No. 2017-116177 filed on June 14, 2017. The entire disclosure including the specification, claims and abstract of Japanese Patent Application No. 2017-116177 filed on June 14, 2017 is incorporated herein by reference in its entirety.

The entire disclosure including the specification, claims, and abstract of JP-A-9-267060 (Patent Document 1) is incorporated herein by reference in its entirety.

DESCRIPTION OF SYMBOLS 1 Spray gun 2 Gun body 3 Baffle ring 4 Liquid nozzle 4a Liquid injection port 5 Packing 5a Groove 6 Gas cap 7 Cover 8 Gas adjustment needle 9 Gas rectifying chamber 10 Needle valve 11 Trigger 12 Needle valve spring 13 Gas valve 14 Gas supply Port 15 Pattern gas control knob 16 Whole gas control knob 17 Liquid supply port 21 Gun head part 21a Male screw 22 Rib part 22a Female screw 22b Taper 22c Gas supply hole 23 Gas flow path tip 24 Nozzle connection part 24a Female screw 24b Taper (first taper)
25 Gas branch groove 31 Base part 31a Male thread 31b Taper 32 Flange part 33 Projection part 41 Nozzle body 41a Male thread 41b Taper (second taper)
42 baffle plate 43 enlarged diameter portion 43a packing arrangement portion 43b movement restricting portion 43c front side portion 43d through hole 43e taper 61 gas cap main body 61a atomizing gas blowing hole 61b auxiliary gas blowing hole 62 corner portion 62a gas blowing hole for pattern adjustment 63 Taper 71 Female thread 72 Packing groove 73 Packing for cover D1 First outer diameter D2 Second outer diameter D3 Third outer diameter O Axis d1 First inner diameter d2 Second inner diameter d3 Third inner diameter d4 Fourth inner diameter r Distance t Width

Claims (4)

A spray gun comprising a gun body and a baffle ring detachable from the gun body,
The gun body
A cylindrical gun head portion provided on the distal end side and having a first inner diameter;
A cylindrical rib portion having a second inner diameter smaller than the first inner diameter, integrally formed with the gun head portion so as to be located rearward of the gun head portion, and having an internal thread on an inner peripheral wall;
It is formed in a part of the rib portion in the circumferential direction, and includes a gas supply hole for supplying gas to the gun head portion side,
The baffle ring is
A cylindrical base portion provided on the outer peripheral wall with a male screw to be screwed with the female screw, and removable with respect to the rib portion by screwing of the male screw and the female screw;
A ring-shaped flange portion integrally formed with the base portion and having a first outer diameter larger than the outer diameter of the base portion;
A protrusion formed integrally with the flange portion and protruding forward from the tip of the gun head portion;
A gap is formed between the inner peripheral wall of the gun head part and the outer peripheral wall of the flange part,
The spray gun according to claim 1, wherein the baffle ring can be attached to and detached from the gun body when the baffle ring is rotated in a state where the protrusion is held. The gun body has a nozzle connecting portion that is located on the rear side of the gun head portion and is provided so as to penetrate the opening of the rib portion,
The spray gun further includes a liquid nozzle attached to the nozzle connecting portion by screwing so as to penetrate the opening of the base portion,
The protruding portion of the baffle ring has a third inner diameter that is larger than the inner diameter of the flange portion,
The flange portion has a fourth inner diameter smaller than the third inner diameter;
The liquid nozzle is
A cylindrical nozzle body capable of ejecting liquid and attached to the nozzle connecting portion;
An enlarged diameter portion provided along the circumferential direction on the outer peripheral wall of the nozzle body,
The expanded diameter portion is
A packing arrangement portion having a second outer diameter smaller than the third inner diameter;
A third outer diameter that is larger than the second outer diameter, a movement restricting portion that is located on the front side of the packing disposing portion and is adjacent to the packing disposing portion;
Between the outer peripheral wall of the packing disposing portion and the inner peripheral wall of the protruding portion, a ring-shaped packing is disposed so as to contact the outer peripheral wall of the packing disposing portion and the inner peripheral wall of the protruding portion,
The packing is sandwiched between the movement restricting portion and the flange portion so as not to contact at least one of the movement restricting portion and the flange portion in the front-rear direction. Item 4. The spray gun according to Item 1. The nozzle connecting portion has a first taper,
The nozzle body has a second taper for engaging the first taper;
The spray gun according to claim 2, wherein the portion where the liquid nozzle and the gun main body are engaged is only the portion where the first taper and the second taper are engaged. The spray gun according to any one of claims 1 to 3, wherein the protrusion has a pair of parallel flat surfaces formed on an outer peripheral wall.

Images