JPH0543880Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a spray nozzle used for example in agricultural chemical spraying vehicles such as boom sprayers and speed sumlayers. This invention relates to a spray nozzle that prevents dripping.

[Conventional technology]

In boom sprayers, speed sprayers, etc., it is harmful for the spray liquid to come into contact with people.
After the spraying is finished, it is necessary to prevent the spray liquid remaining in the spray pipe etc. from dripping from the nozzle.

In Japanese Patent Publication No. 61-5786, an elastic membrane with a notch is provided at the base of the nozzle, and when liquid pressure exceeding a predetermined value is applied to the elastic membrane, the notch opens and directs the spray liquid toward the tip of the nozzle. After the spraying is finished,
When the hydraulic pressure applied to the elastic membrane becomes less than a predetermined value, the notch elastically closes to prevent the spray liquid from passing toward the nozzle tip.

Further, in Japanese Utility Model Application Publication No. 61-48069, an elastic membrane-like valve element is provided which elastically displaces to open and close the through hole. After the spraying is finished, the fluid pressure applied to the elastic membrane valve element from the through hole side decreases, so the elastic membrane valve element is elastically displaced and closes the through hole, causing the remaining spray liquid to drip off. It is now possible to prevent

Furthermore, in Japanese Utility Model Publication No. 61-895, the valve body for the check valve, the compression coil spring that biases the valve body for the check valve, and the nozzle tip are housed in a common inner hole, and after the end of spraying, The check valve body is biased against the valve seat by the biasing force of the compression coil spring to close the passage.

[Problem to be solved by the invention] When an elastic membrane is used, as in Japanese Patent Publication No. 61-5786 and Utility Model Application Publication No. 61-48069, the membrane deteriorates due to the sprayed liquid and the problem is reversed. There is a problem in that the function of the stop valve deteriorates as the period of use passes. According to Japanese Patent Publication No. 61-5786, one of the notch edges in the elastic membrane rides on the other and does not return to its original closed position, causing the check valve function to fail.

In Japanese Utility Model Publication No. 1989-895, when replacing the nozzle tip in each spray nozzle in order to perform spraying that suits the spraying situation, when the nozzle tip is removed, the valve body of the check valve and the compression coil spring are removed from the nozzle. These parts come off and disassemble, making it complicated to replace the nozzle tip.

For example, in the case of a boom sprayer, multiple spray nozzles with check valves are arranged in a long spray pipe.
The internal pressure of the spray pipe is higher toward the base end closer to the pump, so the spray nozzle starts spraying near the base end and stops near the tip, making it difficult to spray uniformly over a rectangular field.

The purpose of this invention is to eliminate the problem of deterioration due to spray liquid, prevent the check valve from disassembling when replacing nozzle tips, etc., and cope with the pressure drop in the spray pipe when multiple rows are installed in a long spray pipe. To provide a spray nozzle that can start and stop spraying all at once over the entire length of a spray pipe by adjusting the biasing force to a check valve.

[Means to solve the problem]

In this invention, the check valve units 10 and 10b, which are removably attached to the tip of the nozzle base member 32 that communicates with the spray pipe 46, are attached to a case body 12 having a valve seat 14 and a through hole 18 at both ends, respectively. and a valve body 26 disposed within the case body 12 so as to be able to sit freely on the valve seat portion 14 disposed toward the spray pipe 46 side.
The valve body 26 is disposed within the case body 12 and the valve body 26 is connected to the valve seat portion 14.
The case body 12 includes a cylindrical portion 16 having a valve seat portion 14, and a lid having a through hole 18 and detachably attached to the opening side of the cylindrical portion 16. portion 20, the lid portion 20 is screwed onto the cylindrical portion 16 so as to be freely displaceable relative to the cylindrical portion 16 in the center line direction in order to change the initial load of the biasing member 28. let me,
Alternatively, a spray nozzle characterized in that a spacer 68 is interposed between the lid member 20 and the biasing member 28 is proposed.

[Effect]

The spray liquid at a predetermined pressure is sent from the spray pipe 46 to the spray nozzle 4.
1, the check valve unit 10,
10b, the valve body 26 moves away from the valve seat 14 of the case body 12 against the biasing member 28, and the spray liquid enters the case body 12 from the valve seat 14 and flows through the passage at the end of the case body 12. It flows from the hole 18 toward the tip of the spray nozzle 41 .

On the other hand, after the spraying is finished, the hydraulic pressure applied from the spray pipe 46 to the valve body 26 decreases, and the valve body 26 is pressed against the valve seat portion 14 by the biasing member 28. As a result, the spray liquid remaining on the side of the spray pipe 46 from the valve seat portion 14 is prevented from flowing toward the tip of the spray nozzle.

In the case body 12, the lid portion 20 is removed from the cylinder portion 16, and the valve body 26 is inserted into the case body 12.
Then, the biasing member 28 is installed and removed.

When the lid portion 20 is rotated with respect to the cylindrical portion 16, the relative position between the cylindrical portion 16 and the through hole 18 in the center line direction changes, and as a result, the initial load of the biasing member 28 changes, and the valve body The liquid pressure when the valve 26 leaves the valve seat 14, that is, the spray start pressure changes.

Alternatively, the spacer 68 is disposed within the case body 12 with the center lines of the valve body 26 and the biasing member 28 aligned. When the dimension, ie, the thickness, of the spacer 68 in the centerline direction is changed, the initial load of the biasing member 28 is also changed, and the hydraulic pressure when the valve body 26 is separated from the valve seat 14, that is, the spray start pressure is changed.

〔Example〕

This invention will be described below with reference to embodiments shown in the drawings.

2 and 3 are longitudinal sectional views of the check valve unit 10 in the closed and open states, respectively. The check valve unit 10 includes a hollow box-shaped case body 12,
The case body 12 has a cylindrical portion 16 whose one end surface is the valve seat portion 14, and a lid portion 20 that closes the opening side of the cylindrical portion 16 and has a through hole 18 in the center. are doing. Figure 4 shows check valve unit 1.
5 is a plan view of the lid portion 20 of the check valve unit 10, and FIG. 6 is a sectional view taken along the line - in FIG. Thread grooves 22 and 24 are formed on the inner periphery of the end portion and the outer periphery of the lid portion 20, respectively.Thread grooves 22 and 24 allow the cylinder portion 16 and the lid portion 20 to
They are screwed together and their relative positions in the center line direction can be changed. The through hole 18 is formed in a square shape, and the tip of a predetermined rotational operation tool is inserted into the through hole 18 when the cylindrical portion 16 and the lid portion 20 are rotated relative to each other.

Returning to FIGS. 2 and 3, the spherical valve body 26
is disposed movably within the case body 12 and can be freely seated on the valve seat portion 14. The compression coil spring 28 is wound into a conical shape and is
0 and the valve body 26, and urges the valve body 26 toward the valve seat portion 14. The O-ring 30 is fitted into an annular groove on the outer periphery of the cylindrical portion 16.

FIG. 7 is a plan view of the nozzle base member 32, and FIG. 8 is a sectional view taken along the line - in FIG. Passage section 3
4 and the check valve unit insertion hole 36 are formed at one end and the other end, respectively, along the center line of the nozzle base member 32, and communicate with each other. The check valve unit insertion hole 36 has a diameter equal to the outer diameter of the cylindrical portion 16 and has a larger diameter than the passage portion 34. The thread grooves 38 and 40 are formed in the outer peripheral portion of the nozzle base member 32 at positions corresponding to the passage portion 34 and the check valve unit fitting hole 36, respectively, in the axial direction.

FIG. 1 is a structural diagram in which a spray nozzle 41 is connected to a spray pipe 46. As shown in FIG. The spray nozzle 41 is used, for example, in an agricultural chemical spraying vehicle such as a boom sprayer or a speed sprayer. The cover 42 and the body 44 are arranged so that the spray pipe 46 is sandwiched between them.
They are joined together and fixed to the spray tube 46. The connection hole 48 of the body 44 is fitted into the hole of the spray pipe 46, and the O-ring 50 is inserted into the body 4 near the connection hole 48.
4 and the spray pipe 46, and the spray pipe 4
6 and the connection hole 48 is prevented from leaking. The nozzle base member 32 of the spray nozzle 41 is screwed into the inner periphery of the end of the body 44 on the opposite side from the connection hole 48 via the thread groove 38, and the O-ring 52 is fitted into an annular groove adjacent to the thread groove 38. This prevents liquid from leaking from the threaded groove 38 to the outside of the spray nozzle 41.
In the check valve unit 10, the valve seat portion 14 is connected to the passage portion 34.
It is inserted into the check valve unit insertion hole 36 of the nozzle base member 32 so that it is on the side. The core 54 is adjacent to the lid portion 20 side of the check valve unit 10, the packing 56 is fitted to the outer periphery of the core 54, and the nozzle tip 58 is adjacent to the core 54 on the opposite side from the check valve unit 10.
adjacent to the surface of The cap 60 is screwed into the thread groove 40 of the nozzle base member 32 to assemble the core 54, packing 56, and nozzle tip 58 to the spray nozzle 41, and tighten them to the nozzle base member 32. The liquid that has passed through the through hole 18 passes through the through hole 64 of the core 54 and enters the core 54 and the nozzle tip 5.
This leads to a vortex chamber 62 formed by 8 and 8. The spout 66 is
A nozzle tip 58 is bored in the center so as to face the central opening of the cap 60, and sprays a spray liquid made into a vortex in a vortex chamber 62.

The operation of the embodiment will be explained.

The spray liquid sent from the spray pump (not shown) reaches the valve seat 14 of the check valve unit 10 via the spray pipe 46, the connection hole 48 and the passage section 34. During operation of the spray pump, the hydraulic pressure applied to the valve body 26 is higher than a predetermined value, so in the check valve unit 10, the valve body 26 moves away from the valve seat 14 against the compression coil spring 28, and the spray is released. The liquid enters the check valve unit 10 through the valve seat part 14, and also proceeds to the outside of the check valve unit 10 through the through hole 18 of the lid part 20, reaches the swirl chamber 62 of the core 54, and enters the nozzle tip 58. The water is ejected from the nozzle 66.

On the other hand, after the spraying is finished, the hydraulic pressure applied to the valve body 26 from the passage portion 34 side decreases to less than a predetermined value, and the valve body 26 is pressed against the valve seat portion 14 by the compression coil spring 28. As a result, the spray liquid remaining upstream from the valve seat portion 14 is prevented from flowing downstream from the valve body 26, and the remaining spray liquid is prevented from dripping from the spray nozzle 41 after spraying is completed. be done.

When changing the spray state of the spray liquid according to the spray conditions, the cap 60 is rotated relative to the nozzle base member 32 and removed from the nozzle base member 32. As a result, the core 54 and the nozzle tip 58
is removed from the nozzle base member 32 and replaced with a desired core 54 and nozzle tip 58. that time,
The check valve unit 10 may also come out from the nozzle base member 32, but the valve body 26 and the compression coil spring 2
Each component of the check valve unit 10 such as 8 is prevented from being disassembled. After replacing the core 54 and nozzle tip 58 with the desired ones, the cap 60 is again screwed into the thread groove 40 of the nozzle base member 32.

When adjusting the spray start pressure of the spray nozzle 41, in the check valve unit 10, insert a rotary operation tool into the square-shaped through hole 18 of the lid portion 20, and press the lid portion 20 against the case body 12. The relative rotation is performed to change the relative position of the lid portion 20 with respect to the case body 12 in the axial direction. By changing the relative position, the axial length of the compression coil spring 28 when the valve body 26 is closed changes, that is, the compression coil spring 28
The initial load of changes. As a result, the hydraulic pressure when the valve body 26 separates from the valve seat portion 14, that is, the spray start pressure changes.

FIG. 9 is a longitudinal sectional view of a modification of the check valve unit 10. In this check valve unit 10b,
The spacers 68 have a suitable thickness, and a suitable number of spacers 68, one or more, are disposed between the lid portion 20 and the compression coil spring 28. Spacer 6
8, the axial length of the compression coil spring 28 when the valve body 26 is closed changes, that is, the initial load of the compression coil spring 28 changes. As a result, the hydraulic pressure when the valve body 26 separates from the valve seat portion 14, that is, the spray start pressure changes.

FIG. 10 shows the arrangement of spray nozzles 41 in a boom sprayer. The boom sprayer includes a center boom 70 at the center, and side booms 72 and 74 that are respectively disposed on the left and right sides of the center boom 70 and are expanded horizontally during operation. The plurality of spray nozzles 41 are attached to each of the center boom 70 and side booms 72, 74 in a line, and are supplied with spray liquid from a common spray pump 76. Although the discharge pressure of the spray pump 76 is constant, the pressure in the liquid feeding path decreases as the distance from the spray pump 76 increases. Therefore, by adjusting the relative positions of the cylindrical portion 16 and the lid portion 20 due to their relative rotation, or the number of spacers 68 disposed inside the case body 12, the spray nozzle 41 closer to the spray pump 76 has a lower position. Check valve unit 10,1
The initial load of the compression coil spring 28 of 0b is increased, thereby making the start of spraying at each spray nozzle 41 constant regardless of the distance between the spray nozzle 41 and the spray pump 76, and achieving uniform dispersion of the spray liquid. be able to. Although FIG. 10 relates to a boom sprayer, the spray start pressure related to the distance between the spray pump 76 and the spray nozzle 41 can also be adjusted for the spray nozzle 41 in other spreaders such as a speed sprayer.

[Effect of idea]

The check valve is made into a unit as a whole, and is attached to the nozzle base member as a check valve unit. Therefore, even when the tip of the spray nozzle is removed in order to replace the nozzle tip, etc., the valve body, biasing member, etc. that make up the check valve do not disassemble, and work efficiency can be improved. . Also,
Since it is not necessary to use materials such as elastic membranes that are easily deteriorated by sprayed liquid as components of the check valve, the life and durability can be extended. When the valve seat portion becomes worn over the course of use, there is no need to replace the entire spray nozzle, and only the case body needs to be replaced, so maintenance costs can be reduced.

The initial load of the biasing member, that is, when the valve body separates from the valve seat, may be affected by changes in the screwing position of the lid part in the cylinder part or by the thickness of the spacer arranged in series with the biasing member in the case body. hydraulic pressure,
That is, the start of spraying changes. Therefore, the spray start pressure in each spray nozzle can be easily adjusted. In particular, when a plurality of spray nozzles are connected to a common spray pump, such as in a boom sprayer, the farther the spray nozzle is from the spray pump, the longer the liquid delivery path to the spray pump. The longer the spray nozzle is, the lower the spray start pressure becomes. On the other hand, the farther the spray nozzle is from the spray pump, the lower the initial load on the biasing member of the check valve unit, which makes it easier for each spray nozzle to start spraying. , regardless of the distance to the spray pump.
The spray liquid can be uniformly distributed at a constant rate.

[Brief explanation of the drawing]

The drawings relate to an embodiment of the invention; FIG. 1 is a structural diagram of a spray nozzle connected to a spray pipe; FIGS. 2 and 3 are longitudinal sectional views of the check valve unit in the closed and open states, respectively; Fig. 4 is a longitudinal sectional view of the cylindrical portion of the check valve unit, Fig. 5 is a plan view of the lid portion of the check valve unit, Fig. 6 is a sectional view taken along the - line in Fig. 5, and Fig. 7 is a longitudinal sectional view of the cylindrical portion of the check valve unit. FIG. 8 is a plan view of the nozzle base member, FIG. 8 is a sectional view taken along the - line in FIG. 7, FIG. 9 is a longitudinal sectional view of a modified example of the check valve unit, and FIG. FIG. 10, 10b...Check valve unit, 12...Case body, 14...Valve seat portion, 16...Cylinder portion, 18
...Through hole, 20...Lid part, 26...Valve body, 28
... Compression coil spring (biasing member), 32 ... Nozzle base member, 41 ... Spray nozzle, 68 ... Spacer.

Claims (1)

[Scope of utility model registration request] a check valve unit 10 that is removably attached to the tip of the nozzle base member 32 that communicates with the spray pipe 46;
10b is disposed within the case body 12 so as to be able to sit freely on the case body 12 having a valve seat portion 14 and a through hole 18 at both ends, and the valve seat portion 14 disposed toward the spray pipe 46 side. a valve body 26 arranged in the case body 12 and the valve body 26 disposed in the case body 12
4, and the case body 12 has a cylindrical portion 16 having the valve seat portion 14.
and a lid portion 20 that has the through hole 18 and is detachably attached to the opening side of the cylinder portion 16. In order to change the initial load of the biasing member 28, the lid portion 20 is screwed onto the cylindrical portion 16 so as to be freely displaceable relative to the cylindrical portion 16 in the center line direction, or a spacer 68 is interposed between the lid portion 20 and the biasing member 28. spray nozzle.