CN218394441U - Hot air atmosphere protection nanoliter injection dispensing valve nozzle - Google Patents

Abstract

The utility model discloses a hot air atmosphere protected nano-liter jet dispensing valve nozzle, which comprises a hot air atmosphere protected nano-liter jet dispensing valve, which comprises an air nozzle and a dispensing nozzle, the air nozzle is connected with a dispensing valve shell, and There are air supply channel A and air supply channel B on both sides, the air supply channel A and air supply channel B are inclined upward, and the lower side is provided with a circular air outlet; the dispensing nozzle is installed inside the air nozzle, and the dispensing There is a glue outlet at the bottom of the nozzle, which has the function of protecting the heat of the glue droplet from dissipating too quickly.

Description

A hot air atmosphere protects nanoliter jet dispensing valve nozzles

technical field

The utility model belongs to the field of glue dispensing technology, in particular to a special nozzle for a hot air atmosphere protection nanoliter jet dispensing valve.

Background technique

Colloid dispensing is a key technology for the packaging and connection of tiny parts. It is to distribute the colloid to the designated position, so as to realize the fixing, encapsulation and welding of electronic components. Widely used in rapid manufacturing, chip manufacturing, genetic engineering microelectronic packaging and other fields. Among them, the dispensing valve is a mechanism that controls the operation and stop of the colloid injection, and the dispensing valve nozzle is a component that ejects the colloid from the lower end of the dispensing valve.

Dispensing technology is divided into traditional contact dispensing and non-contact dispensing. Non-contact dispensing has a certain jet height, which is conducive to adapting to the shape of the workpiece. At present, the technical level of the single dispensing volume of the non-contact jet dispensing valve has developed to the level of nanoliter or even sub-nanometer. When the dispensing valve sprays non-Newtonian fluid colloids such as hot melt adhesive, the tiny glue droplets are easy to flow in the dispensing jet. Excessive heat dissipation during the process causes the temperature to drop too quickly, so that premature gelation occurs during the glue spraying process, which affects the wettability of the glue droplet and the target material, thereby affecting the adhesion of the glue droplet.

Some devices for dispensing glue by setting air protection devices are also disclosed in existing patents, but the air outlets provided by these devices are only a few round holes distributed around, and the ability to protect the sprayed glue drops is extremely limited. If each round hole The uneven flow rate of the sprayed air will also interfere with the dispensing process; at the same time, because the air nozzle and the dispensing nozzle are integrated in these devices, the adaptability to the popular dispensing valves on the Chinese market is poor.

Utility model content

The purpose of this utility model is to solve the problem of excessive heat dissipation in the dispensing process, improve the adhesive force of the glue drop, and provide a special nozzle for the nano-liter jet dispensing valve protected by a hot air atmosphere. The nozzle has the function of protecting the glue drop from heat. dissipate the function too quickly.

The technical scheme that the utility model adopts is as follows:

The utility model hot air atmosphere protection nano-liter injection dispensing valve special nozzle includes a power supply system, a glue supply system, an air supply system and a hot air atmosphere protection nano-liter injection dispensing valve; the hot air atmosphere protection nano-liter injection point The glue valve includes a dispensing valve shell, a power supply pipeline, a piezoelectric stack preload device, a piezoelectric stack preload bolt, a piezoelectric stack, a lever amplification mechanism, a striker, a pan seal, a glue chamber, a spring, and a glue flow channel , air nozzle, dispensing nozzle and colloid heating device; the piezoelectric stack pretensioning device is installed in the inner groove of the dispensing valve shell; the upper end of the piezoelectric stack is closely connected to the piezoelectric stack pretensioning device contact, and a power supply pipeline is connected to the piezoelectric stack; the piezoelectric stack pre-tightening bolt is installed on the dispensing valve shell, and penetrates the dispensing valve shell to be in close contact with the piezoelectric stack pre-tightening device; In the lever amplification mechanism, the near fulcrum end of the lever is in close contact with the lower end of the piezoelectric stack, and the lever fulcrum is fixed inside the dispensing valve shell; the striker is in close contact with the far fulcrum end of the lever amplification mechanism through a cylindrical boss structure, and the striker A pan-seal is provided between the side and the firing pin chamber, and the pan-seal seals the lower part of the firing pin chamber. This part is called the rubber chamber, and the bottom end of the firing pin is embedded in the firing pin chamber of the dispensing valve shell; the upper end of the spring and The lower side of the cylindrical boss structure on the striker is in close contact, and the lower end is fixed on the dispensing valve housing; the colloid flow channel is provided with a colloid supply pipe inside, and the colloid flow channel is connected with the dispensing valve housing through thread fit; The above-mentioned air nozzle is connected with the dispensing valve shell through thread fit, and there are air supply channel A and air supply channel B on both sides, the air supply channel A and air supply channel B are inclined upward, and the axis and the vertical plane are 10-30 °, a circular air outlet is provided on the lower side; the dispensing nozzle is installed inside the air nozzle through shape fit, and a glue outlet is opened at the bottom; the colloid heating device is connected with the colloid flow channel through thread fit, And there is a colloid supply pipeline inside. The power supply system is connected to the hot air atmosphere protected nanoliter jet dispensing valve through the power supply pipeline; the glue supply system is connected to the hot air atmosphere protected nanoliter jet dispensing valve through the glue supply pipeline; the air supply system It is connected to the hot air atmosphere protected nanoliter jet dispensing valve through air supply channel A and air supply channel B.

Preferably, the two air supply channels A and B on the air nozzle are distributed symmetrically along the central axis of the air nozzle. The temperature of the warm air in the air supply system should be 5-10°C higher than the temperature of the sprayed colloid droplets to ensure that the temperature of the sprayed warm air flow is consistent with the temperature of the glue droplets, and strengthen the air nozzle’s effect on the dispensing process. Protective effects.

Preferably, the axis of the air supply channel A and the air supply channel B should be 10-30° with respect to the vertical plane, so as to ensure that the sprayed warm air flow will not affect the fluid dispensing.

Preferably, the air supply system should change the air supply pressure according to the ejected dispensing speed, so as to ensure that the speed of the ejected glue droplets is consistent with the ejected warm air flow speed, and prevent the warm air flow from disturbing the dispensing process ;According to the simulation results, when the velocity of the sprayed glue droplet is 20-25m/s, the static pressure of the air supply pressure should be 500-600pa; when the sprayed glue droplet velocity is 25-30m/s, the air supply pressure The static pressure of the air supply should be 600-800pa. When the velocity of the sprayed glue droplet is 30-35m/s, the static pressure of the air supply pressure should be 800-1100pa. When the sprayed glue droplet velocity is 35-40m/s , The static pressure of the air supply pressure should be 1100-1400pa.

The hot air atmosphere protects the working method of the special nozzle of the nanoliter jet dispensing valve, as follows:

First, by twisting the piezoelectric stack pre-tightening bolt, the piezoelectric stack pre-tightening device is pressed from the side to pre-tighten the piezoelectric stack; then, the glue supply system delivers the glue to the glue heating device through the glue supply pipe After heating, the colloid flows into the colloid supply pipe inside the colloid flow channel, and then enters the glue cavity; after the power supply system supplies high voltage to the piezoelectric stack through the power supply pipeline, the piezoelectric stack stretches and presses the lever amplification mechanism downward. ; Due to the displacement amplification effect of the lever amplification mechanism, the striker is driven to move vertically downward, and the glue liquid in the extruded glue chamber is ejected from the glue outlet in the dispensing nozzle, and the spring is compressed at the same time; After the piezoelectric stack is connected to the low voltage, the piezoelectric stack retracts, and the compressed spring pushes the striker to move vertically upwards, and at the same time drives the lever amplification mechanism to lift upwards. When the striker moves vertically upwards, the colloid passes through the colloid supply pipe Enter the glue cavity; input a pulse voltage of a specific frequency to the piezoelectric stack, drive the striker to move at the corresponding frequency and extrude the glue to be ejected from the glue outlet; Hot air (temperature 5-10°C higher than the droplet temperature) is delivered to the air nozzle and sprayed out from the lower air outlet to form a warm air protection airflow to protect the droplet sprayed from the nozzle outlet and prevent it from being damaged by thermal diffusion. Premature condensation.

The beneficial effect that the utility model has is:

1) The utility model wraps the sprayed glue droplets through the warm air flow, and creates a warm air protective layer in the same direction as the glue dispensing flow field during the glue dispensing process, reducing the heat dissipation of the glue droplets, thereby optimizing The wettability of the glue droplet and the target increases the adhesion of the glue droplet after solidification.

2) The utility model greatly reduces the disturbance and influence of the surrounding air on the dispensing during the dispensing process, and at the same time, the airflow field in the same direction is conducive to the spraying of the colloid into droplets, thereby increasing the maximum spray height of the dispensing, which is beneficial to the dispensing The valve can adapt to a wider range of workpiece process conditions.

3) The two air supply channels A and B on the air nozzle in the present utility model are distributed symmetrically along the central axis of the air nozzle. The temperature of the warm air in the air supply system should be 5-10°C higher than the temperature of the sprayed colloid droplets to ensure that the temperature of the sprayed warm air flow is consistent with the temperature of the glue droplets, and strengthen the air nozzle’s effect on the dispensing process. Protective effects.

4) The axes of the air supply channel A and the air supply channel B in the present invention should be 10-30° to the vertical plane to ensure that the sprayed warm air flow will not affect the fluid dispensing.

Description of drawings

The accompanying drawings constituting a part of the utility model are used to provide a further understanding of the utility model, and the schematic embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute improper limitations to the utility model.

Figure 1 is a schematic cross-sectional structure diagram of the air nozzle in the special nozzle of the hot air atmosphere protection nanoliter jet dispensing valve of the present invention.

Fig. 2 is a schematic cross-sectional structure diagram of the dispensing nozzle in the special nozzle of the hot air atmosphere protection nanoliter jet dispensing valve of the present invention.

Fig. 3 is a schematic cross-sectional structure diagram of the hot air atmosphere protection nanoliter jet dispensing valve of the present invention.

Fig. 4 is a side cross-sectional structural schematic diagram of the hot air atmosphere protection nanoliter jet dispensing valve of the present invention.

Fig. 5 is a partial cross-sectional structure schematic diagram of the hot air atmosphere protection nanoliter jet dispensing valve nozzle of the present invention.

Fig. 6 is a three-dimensional top view of the overall structure of the hot air atmosphere protection nanoliter jet dispensing valve of the present invention.

Fig. 7 is a three-dimensional bottom view of the overall structure of the hot air atmosphere protection nanoliter jet dispensing valve of the present invention.

In the figure: 1. Air nozzle; 2. Air supply channel A; 3. Air supply channel B; 4. Air outlet; 5. Dispensing nozzle; 6. Glue outlet; 7. Glue cavity; 8. Universal plug seal; 9. Spring; 10. Striker; 11. Piezoelectric stack pretensioning device; 12. Dispensing valve shell; 13 Piezoelectric stack; 14. Lever amplification mechanism; 15. Colloid flow channel; 16. Colloid heating device; 17 .Colloid supply pipeline; 18. Power supply pipeline; 19. Piezoelectric stack pre-tightening bolts; 101. Power supply system; 102. Glue supply system; 103. Gas supply system.

Detailed ways

It should be pointed out that the following detailed descriptions are all exemplary and are intended to provide further description of the present utility model. Unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by those of ordinary skill in the art to which this application belongs.

It should be noted that the terminology used here is only used to describe specific embodiments, and is not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the utility model clearly states otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprising" and/or "comprising" are used in this specification, It specifies the presence of features, steps, operations, means, components and/or combinations thereof;

For the convenience of description, if the words "up", "down", "left" and "right" appear in the utility model, it only means that it is consistent with the directions of up, down, left and right of the drawings themselves, and does not limit the structure , is only for the convenience of describing the utility model and simplifying the description, but does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the utility model.

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

As shown in Figure 1 and Figure 2, the hot air atmosphere protection nano-liter jet dispensing valve special nozzle, including air nozzle 1 and dispensing nozzle 5, the air nozzle 1 includes air supply channel A2, air supply channel B3 and outlet The air port 4, the air supply channel A2 and the air supply channel B3 are inclined upwards, the axis and the vertical plane are 10-30°, and the circular air outlet 4 is set on the lower side of the air nozzle 1; the dispensing nozzle 5 includes an outlet The glue port 6 and the dispensing nozzle 5 are installed inside the air nozzle 1 through form fit.

As shown in Figure 3 and Figure 4, the hot air atmosphere protects the nanoliter jet dispensing valve, including air nozzle 1, dispensing nozzle 5, glue chamber 7, pan seal 8, spring 9, striker 10, piezoelectric stack pre- Tightening device 11, dispensing valve shell 12, piezoelectric stack 13, lever amplification mechanism 14, colloid flow channel 15, colloid heating device 16, colloid supply pipeline 17, power supply pipeline 18 and piezoelectric stack pre-tightening bolt 19; The electric stack pretensioning device 11 is installed in the groove inside the dispensing valve housing 12, and is fixed by the piezoelectric stack pretensioning bolt 19; the piezoelectric stack 13 is provided with a power supply pipeline 18 and communicated with the outside world, and the piezoelectric stack 13 is connected with the outside world. The upper end of the stack 13 is in close contact with the piezoelectric stack pretensioner 11, and the lower end of the piezoelectric stack 13 is in close contact with the end of the lever amplification mechanism 14 near the fulcrum; The far fulcrum end of the mechanism 14 is in close contact with the upper side of the cylindrical boss structure of the upper section of the striker 10; the upper end of the spring 9 is in close contact with the lower side of the cylindrical boss structure of the upper section of the striker 10, and the lower end of the spring 9 is fixed on the dispensing valve shell 12 There is a pan seal 8 between the side of the striker 10 and the striker chamber, the pan seal 8 seals the lower part of the striker chamber, this part is called the glue chamber 7, and the bottom end of the striker 10 is embedded in the striker chamber of the dispensing valve shell Middle; the air nozzle 5 is connected with the dispensing valve housing 12 through thread fit, the dispensing nozzle 5 is installed inside the air nozzle 1 through shape fit, the colloid flow channel 15 is connected with the dispensing valve housing 12 through thread fit, and the colloid heating device 16 passes through The screw thread is connected with the colloid flow channel 15 , and a colloid supply pipe 17 is provided inside the colloid heating device 16 and the colloid flow channel 15 .

As shown in Figures 3 and 4, the hot air atmosphere protects the nanoliter jet dispensing valve system, including a power supply system 101, a glue supply system 102, and an air supply system 103. The hot air atmosphere protects the nanoliter jet dispensing valve, and the power supply system 101 passes through The power supply pipeline 18 is connected to the hot air atmosphere protected nanoliter jet dispensing valve, the glue supply system 102 is connected to the hot air atmosphere protected nanoliter jet dispensing valve through the glue supply pipeline 17, and the air supply system 103 is connected to the gas supply pipeline A2 and the air supply Channel B3 connects to the hot air atmosphere protected nanoliter jet dispensing valve.

As a preferred embodiment, the said flood seal 8 between the striker 10 and the striker chamber is a PBT plastic flood seal.

As a preferred embodiment, the dispensing valve housing 12 is provided with two M8 threaded holes, the colloid flow channel 15 is provided with four M8 threaded holes, and the lower side of the colloid heating device 16 is provided with two Four M8 threaded holes, a total of four M8 bolts pass through a threaded hole of the glue flow channel 15, and are connected with a corresponding M8 threaded hole of the dispensing valve housing 12 and the glue heating device 16.

As a preferred embodiment, the air supply channel A2 and the air supply channel B3 on the air nozzle 1 are symmetrically distributed along the central axis of the air nozzle 1, which can effectively balance the air flow and avoid the hot air flow field direction from dispensing. The direction of the flow field is inconsistent.

As a preferred embodiment, the temperature of the warm air in the air supply system 103 should be 5-10°C higher than the temperature of the sprayed colloid drops, so as to ensure that the temperature of the sprayed warm air flow is consistent with the temperature of the glue drops, strengthening The air nozzle protects the dispensing process.

As a preferred embodiment, the axis of the air supply channel A2 and the air supply channel B3 should be 10-30° to the vertical plane, so as to ensure that the sprayed warm air flow will not affect the fluid dispensing.

As a preferred embodiment, the air supply system 103 should change the air supply pressure according to the ejected dispensing speed to ensure that the speed of the ejected glue droplets is consistent with the ejected warm air flow rate, preventing the warm air from converging on the points. The glue process causes disturbance; according to the simulation results, when the speed of the sprayed glue drops is 20-25m/s, the static pressure of the air supply should be 500-600pa; The static pressure of the air should be 600-800pa. When the speed of the sprayed glue drops is 30-35m/s, the static pressure of the air supply should be 800-1100pa. When the speed of the sprayed glue drops is 35-40m/s, the air supply The air static pressure should be 1100-1400pa.

The hot air atmosphere protects the working method of the special nozzle of the nanoliter jet dispensing valve, as follows:

Firstly, the piezoelectric stack pre-tightening device 11 is compressed by twisting the piezoelectric stack pre-tightening bolt 19, and the piezoelectric stack 13 is pre-tightened; then, the glue supply system 102 delivers the glue to the glue heating through the glue supply pipe 17. In the device 16, after heating, the colloid flows into the colloid supply pipe 17 inside the colloid channel 15, and then enters the glue cavity 7; after the power supply system 101 feeds high voltage to the piezoelectric stack 13 through the power supply pipeline 18, the piezoelectric stack 13 stretches and presses down the lever amplifying mechanism 14; due to the displacement amplification effect of the lever amplifying mechanism 14, the striker 10 is driven to move vertically downward, extruding the glue in the glue chamber 7 from the dispensing nozzle 5 The glue outlet 6 is ejected, and the spring 9 is compressed at the same time; after the power supply system 101 supplies a low voltage to the piezoelectric stack 13 through the power supply pipe 18, the piezoelectric stack 13 retracts, and the compressed spring 9 pushes the striker 10 vertically Move upwards, and at the same time drive the lever amplification mechanism 14 to lift upwards. When the striker 10 moves vertically upwards, the glue enters the glue chamber 7 through the glue flow channel 15; input a pulse voltage of a specific frequency to the piezoelectric stack 13, and the striker 10 Move according to the corresponding frequency and squeeze the glue to be ejected from the glue outlet 6; the air supply system 103 sends warm air (5-10°C higher than the temperature of the glue drop) to the air through the air supply channel A2 and the air supply channel B3 In the nozzle 1, and spray from the lower air outlet 4; form a warm air protection airflow, protect the glue droplets sprayed from the nozzle outlet, and prevent premature condensation due to thermal diffusion.

Finally, it should be noted that relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any relationship between these entities or operations. This actual relationship or sequence.

The above descriptions are only preferred embodiments of the utility model, and are not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (11)

1. A hot air atmosphere protection nano-liter jet dispensing valve nozzle is characterized in that it comprises a hot air atmosphere protection nano-liter jet dispensing valve; a hot air atmosphere protection nano-liter jet dispensing valve includes a shell, a piezoelectric stack pre- tightening device, piezoelectric stack, lever amplification mechanism, striker, spring, colloid flow channel, air nozzle, dispensing nozzle and colloid heating device; piezoelectric stack pretensioning device is installed in the inner groove of the shell; piezoelectric stack The upper end is in close contact with the piezoelectric stack pretensioning device, and the lower end of the piezoelectric stack is in close contact with the near fulcrum end of the lever in the lever amplifying mechanism; the lever fulcrum is fixed inside the shell; the striker contacts the far fulcrum end of the lever amplifying mechanism through a cylindrical boss structure In close contact, the lower part of the firing pin is embedded in the firing pin chamber of the shell, and a pan-seal is provided between the firing pin and the firing pin chamber of the shell, and the pan-seal seals the lower part of the firing pin chamber, which is called the rubber chamber; the spring The upper end is in close contact with the lower side of the cylindrical boss structure on the striker, and the lower end is fixed on the dispensing valve housing; the air nozzle is connected with the dispensing valve housing through threaded fit, and the air supply channel A and the air supply channel A are opened on both sides. The supply channel B, the air supply channel A and the air supply channel B are inclined upward, and the lower side is provided with a circular air outlet; the dispensing nozzle is installed inside the air nozzle, and the bottom of the dispensing nozzle is provided with a glue outlet; A colloid supply pipe is opened inside the colloid flow channel, and the colloid flow channel is connected with the dispensing valve shell through thread fit; the colloid heating device is connected with the colloid flow channel through thread fit. 2 . The hot air atmosphere protected nanoliter jet dispensing valve nozzle according to claim 1 , further comprising a power supply system, and the power supply system is connected to the piezoelectric stack through a power supply pipeline. 3 . 3. The hot air atmosphere protection nano-liter injection dispensing valve nozzle as claimed in claim 1, further comprising a glue supply system, and the glue supply system protects the nanoliter injection point through a glue supply pipeline and a hot air atmosphere The glue valve is connected. 4. The hot air atmosphere protection nano-liter jet dispensing valve nozzle as claimed in claim 1, is characterized in that, also comprises air supply system, described air supply system passes air supply channel A and air supply channel B and hot air Atmosphere protected nanoliter jet dispensing valve attached. 5. The hot air atmosphere protection nano-liter jet dispensing valve nozzle as claimed in claim 4, is characterized in that, the temperature of the warm air in the air supply system should be 5-10% higher than the temperature of the sprayed colloid drops. ℃. 6. The hot air atmosphere protected nano-liter jet dispensing valve nozzle as claimed in claim 1, characterized in that, the flood seal between the striker and the striker chamber is a PBT plastic flood seal. 7. The hot air atmosphere protected nano-liter jet dispensing valve nozzle as claimed in claim 1, wherein two threaded holes are provided on the housing of the dispensing valve, and four holes are provided on the described colloid flow channel. Threaded holes, two threaded holes are provided on the side of the colloid heating device, each bolt passes through a threaded hole of the colloid flow channel, and is connected with a corresponding threaded hole of the dispensing valve shell and the colloid heating device. 8. The hot air atmosphere protection nano-liter jet dispensing valve nozzle as claimed in claim 1, characterized in that, the two air supply passages A and air supply passage B on the air nozzle are symmetrical along the central axis of the air nozzle distributed. 9. The hot air atmosphere protected nanoliter jet dispensing valve nozzle as claimed in claim 1, wherein the axis of the air supply channel A and the air supply channel B should be 10-30° on the vertical plane. 10. The hot air atmosphere protection nano-liter jet dispensing valve nozzle as claimed in claim 4, wherein the air supply system should change the air supply pressure according to the ejected dispensing speed to ensure the ejected glue droplet speed Consistent with the velocity of the ejected warm air flow. 11. The hot air atmosphere protected nanoliter jet dispensing valve nozzle as claimed in claim 1, wherein the dispensing nozzle is installed inside the air nozzle through a boss.

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