Pulse jet dispensing valve

Abstract

The utility model relates to the technical field of dispensing, and particularly discloses a pulse jet dispensing valve, which comprises a dispensing valve body provided with a nozzle; the glue barrel is provided with a glue storage cavity communicated to the nozzle; the firing pin is mounted in the dispensing valve body in a sliding manner; the spring abuts against the firing pin and is used for driving the firing pin to slide in the direction away from the nozzle so as to open the nozzle. The elastic membrane is located on the side, away from the nozzle, of the firing pin. And the air supply valve is communicated to the side, away from the firing pin, of the elastic membrane and used for supplying air to the elastic membrane, so that the firing pin slides in the direction close to the nozzle to block the nozzle. The pulse jet dispensing valve provided by the utility model not only can provide enough displacement of the firing pin, but also can keep the stability of the displacement, so that the shaking of the firing pin is reduced, and the consistency and accuracy of dispensing are improved.

Description

Technical Field

[0001] This utility model relates to the field of dispensing technology, and in particular to a pulse jet dispensing valve. Background Technology

[0002] Jet dispensing technology is widely used in precision coating operations in industries such as electronics manufacturing, precision instruments, and medical devices. Currently, most jet dispensing valves on the market use piezoelectric ceramics to drive the dispensing action.

[0003] The displacement of a piezoelectric ceramic when fully extended is only about 40 micrometers, while the displacement required by the ejector pin in actual dispensing processes is between 100 and 280 micrometers. To meet this requirement, existing jet dispensing valve designs typically employ a lever amplification structure to amplify the output displacement of the piezoelectric ceramic. While the lever amplification structure solves the problem of insufficient ejector pin displacement to some extent, it also introduces new technical challenges:

[0004] The lever amplification structure amplifies not only the displacement but also the output displacement deviation of the piezoelectric ceramic actuator. Since the displacement accuracy of the piezoelectric ceramic actuator is affected by various factors, such as temperature changes and performance degradation due to long-term use, these factors can lead to displacement instability. When this instability is transmitted through the lever amplification structure, the originally small displacement deviation is amplified, resulting in significant fluctuations in the trajectory of the ejector pin during the dispensing process.

[0005] This fluctuation manifests as the vibration of the dispensing needle, which causes the problem of scattered dots during dispensing. Specifically, scattered dots refer to the inconsistency in the size and shape of the glue dots during the dispensing process, as well as the phenomenon that the position of the glue dots deviates from the predetermined trajectory.

[0006] The presence of scattering issues seriously affects the quality of the dispensing process, especially in high-precision electronic assembly and precision manufacturing fields. Scattering issues can lead to increased product defect rates, reduced production efficiency, and lower product quality.

[0007] Therefore, it is necessary to develop a new dispensing valve that can provide sufficient needle displacement while maintaining displacement stability, thereby reducing needle vibration and improving dispensing consistency and accuracy.

[0008] The information disclosed in this background section is included only to enhance the understanding of the context of this disclosure, and therefore may contain information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0009] One objective of this invention is to provide a pulse jet dispensing valve that can provide sufficient needle displacement while maintaining displacement stability, thereby reducing needle vibration and improving dispensing consistency and accuracy.

[0010] To achieve the above objectives, this utility model provides a pulse jet dispensing valve, comprising:

[0011] A dispensing valve body, wherein the dispensing valve body is provided with a nozzle;

[0012] A glue cartridge, wherein the glue cartridge is provided with a glue storage cavity communicating with the nozzle;

[0013] A firing pin, which is slidably mounted in the dispensing valve body;

[0014] A spring, which abuts against the firing pin, is used to drive the firing pin to slide away from the nozzle in order to open the nozzle;

[0015] An elastic diaphragm is located on the side of the firing pin away from the nozzle;

[0016] An air supply valve is connected to the side of the elastic diaphragm away from the firing pin, for supplying air to the elastic diaphragm, causing the firing pin to slide toward the nozzle to block the nozzle.

[0017] Optionally, a guide sleeve is provided inside the dispensing valve body at a position directly above the nozzle, and the firing pin slides through the guide sleeve.

[0018] Optionally, the dispensing valve body further includes a valve seat connected to the nozzle and a connecting block connected to the glue cartridge;

[0019] The valve seat and the connecting block are fastened together by fasteners.

[0020] Optionally, the connecting block is provided with a glue inlet communicating with the glue tube, and the valve seat is provided with an inclined flow channel communicating with the glue inlet to the nozzle.

[0021] Optionally, the valve seat and the connecting block are made of SUS316, SUS304, PEEK, POM, or Teflon.

[0022] Optionally, a pressure sensor is abutted against the surface of the elastic diaphragm away from the striker.

[0023] Optionally, the firing pin and the nozzle are made of tungsten carbide, SKH51, or 440C.

[0024] Optionally, the elastic diaphragm is made of silicone rubber, fluororubber, or nitrile rubber.

[0025] The beneficial effects of this utility model are as follows: It provides a pulse jet dispensing valve. When in use, it is necessary to first store the adhesive in the storage chamber and provide a stable air pressure to the storage chamber so that the adhesive in the storage chamber flows toward the nozzle under the action of air pressure. When the air supply valve is closed, the air supply valve does not blow air to the elastic diaphragm. Then, the firing pin will slide away from the nozzle under the driving action of the spring to open the nozzle, and the adhesive in the storage chamber can be sprayed out through the nozzle.

[0026] When the air supply valve is opened, it blows air into the elastic diaphragm, causing the diaphragm to deform downwards and overcome the spring force, driving the ejector pin to slide towards the nozzle to block the nozzle and thus stop the dispensing.

[0027] Therefore, by rapidly switching the on / off state of the air supply valve, a pulsed airflow can be provided to the elastic diaphragm, which in turn causes the elastic diaphragm to rapidly reciprocate, ultimately achieving pulse jet dispensing.

[0028] The pulse jet dispensing valve provided by this utility model eliminates the traditional lever amplification structure and replaces it with a structure that uses an elastic diaphragm to directly drive the firing pin. The elastic diaphragm has good deformation capability, so it can provide sufficient kinetic energy for the firing pin, thereby achieving a larger displacement and enabling the firing pin to reach a greater displacement range.

[0029] Therefore, the pulse jet dispensing valve provided by this utility model can provide sufficient needle displacement and maintain displacement stability, thereby reducing needle vibration and improving the consistency and accuracy of dispensing. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 A schematic diagram of the pulse jet dispensing valve provided in the embodiment;

[0032] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle;

[0033] Figure 3 An exploded view of the dispensing valve body provided in the embodiment.

[0034] In the picture:

[0035] 1. Dispensing valve body; 101. Nozzle; 102. Guide sleeve; 103. Valve seat; 1031. Inclined flow channel; 104. Connecting block; 1041. Glue inlet;

[0036] 2. Glue cartridge; 201. Glue storage chamber;

[0037] 3. Firing pin;

[0038] 4. Spring;

[0039] 5. Elastic diaphragm;

[0040] 6. Gas supply valve;

[0041] 7. Pressure sensor. Detailed Implementation

[0042] In this utility model, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment can be included in at least one embodiment of this utility model. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this utility model, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0043] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit the invention.

[0044] In the description of this utility model, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " generally indicates that the preceding and following objects have an "or" logical relationship.

[0045] In this invention, terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy, or order between these entities or operations.

[0046] Without further limitations, the use of terms such as “comprising,” “including,” “having,” or other similar expressions in this invention is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a series of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.

[0047] Similar to the understanding in the Examination Guidelines, in this utility model, expressions such as "greater than," "less than," and "exceeding" are understood to exclude the stated number; expressions such as "above," "below," and "within" are understood to include the stated number. Furthermore, in the description of the embodiments of this utility model, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times," unless otherwise explicitly specified.

[0048] In the description of the embodiments of this utility model, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the convenience of describing the specific embodiments of this utility model or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0049] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this utility model, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two components or the interaction between two components. For those skilled in the art to which this utility model pertains, the specific meaning of the above terms in the embodiments of this utility model can be understood according to the specific circumstances.

[0050] This invention provides a pulse jet dispensing valve suitable for dispensing applications. It can provide sufficient needle displacement and maintain displacement stability, thereby reducing needle vibration and improving dispensing consistency and accuracy.

[0051] See Figures 1-3 The pulse jet dispensing valve proposed in this embodiment includes a dispensing valve body 1, a glue cylinder 2, a striking pin 3, a spring 4, an elastic diaphragm 5, and an air supply valve 6.

[0052] The dispensing valve body 1 is provided with a nozzle 101; the glue cartridge 2 is provided with a glue storage cavity 201 connected to the nozzle 101; the ejector pin 3 is slidably installed in the dispensing valve body 1; the spring 4 abuts against the ejector pin 3 and is used to drive the ejector pin 3 to slide away from the nozzle 101 to open the nozzle 101.

[0053] The elastic diaphragm 5 is located on the side of the impact pin 3 away from the nozzle 101; the air supply valve 6 is connected to the side of the elastic diaphragm 5 away from the impact pin 3, and is used to supply air to the elastic diaphragm 5, so that the impact pin 3 slides toward the nozzle 101 to block the nozzle 101.

[0054] The pulse jet dispensing valve provided by this utility model requires the glue to be stored in the glue storage chamber 201 first, and a stable air pressure to be provided to the top of the glue storage chamber 201 so that the glue in the glue storage chamber 201 flows toward the nozzle 101 under the action of air pressure; when the air supply valve 6 is closed, the air supply valve 6 does not blow air to the elastic diaphragm 5, and the striking pin 3 will slide away from the nozzle 101 under the driving action of the spring 4 to open the nozzle 101, and the glue in the glue storage chamber 201 can be sprayed out through the nozzle 101;

[0055] When the air supply valve 6 is opened, the air supply valve 6 blows air into the elastic diaphragm 5, which deforms downward and overcomes the elastic force of the spring 4, driving the ejector pin 3 to slide towards the nozzle 101 to block the nozzle 101 and thus stop the dispensing.

[0056] Therefore, by rapidly switching the on / off state of the air supply valve 6, a pulsed airflow can be provided to the elastic diaphragm 5, thereby causing the elastic diaphragm 5 to rapidly reciprocate and ultimately achieve pulse jet dispensing.

[0057] The pulse jet dispensing valve provided by this utility model eliminates the traditional lever amplification structure and instead uses an elastic diaphragm 5 to directly drive the impact pin 3. The elastic diaphragm 5 has good deformation capability, so it can provide sufficient kinetic energy for the impact pin 3, thereby achieving a larger displacement and enabling the impact pin 3 to reach a greater displacement range.

[0058] Therefore, the pulse jet dispensing valve provided by this utility model can provide sufficient displacement of the ejector pin 3 and maintain the stability of the displacement, thereby reducing the vibration of the ejector pin 3 and improving the consistency and accuracy of dispensing.

[0059] Optionally, the air supply valve 6 is a high-speed solenoid valve to enable high-frequency switching control, thereby achieving high-frequency pulse air blowing.

[0060] Inside the dispensing valve body 1, a guide sleeve 102 is provided directly above the nozzle 101, through which the ejector pin 3 slides. The guide sleeve 102 improves the smoothness of the ejector pin 3's up-and-down sliding.

[0061] Optionally, the dispensing valve body 1 further includes a valve seat 103 connected to the nozzle 101 and a connecting block 104 connected to the glue cartridge 2; wherein the valve seat 103 and the connecting block 104 are fastened together by fasteners.

[0062] In this embodiment, the connecting block 104 is provided with a glue inlet 1041 communicating with the glue cartridge 2, and the valve seat 103 is provided with an inclined flow channel 1031 communicating with the glue inlet 1041 to the nozzle 101. The connecting block 104 is detachable, which is beneficial for replacing glue cartridges 2 of different sizes.

[0063] Optionally, the valve seat 103 and the connecting block 104 are made of SUS316, SUS304, PEEK, POM, or Teflon. These materials all possess excellent chemical stability, temperature resistance, mechanical strength, and processing performance. They can withstand the erosion of corrosive adhesives, keep the flow channel clean, are not prone to reacting with adhesives, and can withstand the pressure and temperature changes generated during the dispensing process. This material selection not only ensures the stable operation of the dispensing valve in various environments but also provides flexibility, allowing the selection of the most suitable material according to different adhesive types and working conditions, thereby improving the overall performance and service life of the dispensing valve.

[0064] In this embodiment, a pressure sensor 7 is attached to the surface of the elastic diaphragm 5 away from the impact pin 3. The pressure sensor 7 can collect deformation information of the elastic diaphragm 5, thereby controlling the start and stop timing of the air supply valve 6. Specifically, when the pressure value detected by the pressure sensor 7 reaches a preset value, it indicates that the upward stroke of the impact pin 3 has reached its limit position. At this time, air can be blown onto the elastic diaphragm 5 through the air supply valve 6 to make the impact pin 3 enter the downward stroke.

[0065] Optionally, the firing pin 3 and the nozzle 101 are made of tungsten carbide, SKH51, or 440C. These materials all possess high hardness, excellent wear resistance, and good corrosion resistance. These properties enable the firing pin 3 and nozzle 101 to maintain shape and dimensional stability during frequent dispensing operations, reducing wear, extending service life, and maintaining good performance when in contact with various adhesives and other materials. Furthermore, these materials can be machined into high-precision components, ensuring accurate operation of the dispensing valve, thereby improving the precision of the dispensing process and product quality.

[0066] In this embodiment, the elastic diaphragm 5 is made of silicone rubber, fluororubber, or nitrile rubber. These materials can withstand repeated compression and release processes without rapid fatigue, while also resisting the erosion of adhesives and other chemicals, ensuring the long-term stable operation of the elastic diaphragm 5 in the dispensing valve. Silicone rubber is a preferred choice for the elastic diaphragm 5 due to its excellent temperature resistance and wide applicability.

[0067] In summary, the pulse jet dispensing valve provided in this embodiment has the following advantages:

[0068] ① High-frequency pulse control: By using a high-speed solenoid valve as the air supply valve 6, this invention can achieve high-frequency switching control, thereby realizing high-frequency pulse blowing. This control method can precisely adjust the dispensing frequency and pulse width, improving the accuracy and consistency of dispensing.

[0069] ② Simplified structure: The traditional lever amplification structure has been eliminated, and the elastic diaphragm 5 is used to directly drive the impact pin 3, which simplifies the structure of the dispensing valve, reduces potential failure points, and improves the reliability of the equipment.

[0070] ③ Improve kinetic energy and displacement range: The elastic diaphragm 5 has good deformation ability, which can provide sufficient kinetic energy for the ejector pin 3 to achieve a larger displacement range, so that the ejector pin 3 can reach a farther displacement and adapt to different dispensing needs.

[0071] ④ Reduce vibration and improve stability: Due to the direct drive of the elastic diaphragm 5, the displacement output of the impact pin 3 is smoother, reducing vibration and improving the consistency and accuracy of dispensing.

[0072] ⑤ Intelligent control: By collecting deformation information of the elastic diaphragm 5 through the pressure sensor 7, the timing of the start and stop of the air supply valve 6 can be precisely controlled, further optimizing the dispensing process.

[0073] Finally, it should be noted that although the above embodiments have been described in the text and drawings of this application, this should not limit the scope of patent protection of this application. Any technical solutions that are based on the essential concept of this application and utilize the content described in the text and drawings of this application, resulting in equivalent structural or procedural substitutions or modifications, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of patent protection of this application.

Claims

1. A pulse jet dispensing valve, characterized in that, include: Dispensing valve body (1), wherein the dispensing valve body (1) is provided with a nozzle (101); The glue cylinder (2) is provided with a glue storage chamber (201) connected to the nozzle (101). The striking pin (3) is slidably installed inside the dispensing valve body (1); A spring (4) abuts against the striker (3) to drive the striker (3) to slide away from the nozzle (101) to open the nozzle (101). An elastic diaphragm (5) is located on the side of the firing pin (3) away from the nozzle (101); An air supply valve (6) is connected to the side of the elastic diaphragm (5) away from the striker (3) for supplying air to the elastic diaphragm (5) so that the striker (3) slides toward the nozzle (101) to block the nozzle (101).

2. The pulse jet dispensing valve according to claim 1, characterized in that, The dispensing valve body (1) has a guide sleeve (102) located directly above the nozzle (101) inside, and the firing pin (3) slides through the guide sleeve (102).

3. The pulse jet dispensing valve according to claim 1, characterized in that, The dispensing valve body (1) also includes a valve seat (103) connected to the nozzle (101) and a connecting block (104) connected to the glue cartridge (2). The valve seat (103) and the connecting block (104) are fastened together by fasteners.

4. The pulse jet dispensing valve according to claim 3, characterized in that, The connecting block (104) is provided with an inlet (1041) communicating with the glue tube (2), and the valve seat (103) is provided with an inclined flow channel (1031) communicating with the inlet (1041) to the nozzle (101).

5. The pulse jet dispensing valve according to claim 3, characterized in that, The valve seat (103) and the connecting block (104) are made of SUS316, SUS304, PEEK, POM, or Teflon.

6. The pulse jet dispensing valve according to claim 1, characterized in that, The surface of the elastic diaphragm (5) away from the impact pin (3) is abutted against a pressure sensor (7).

7. The pulse jet dispensing valve according to claim 1, characterized in that, The firing pin (3) and the nozzle (101) are made of tungsten steel, SKH51 or 440C.

8. The pulse jet dispensing valve according to claim 1, characterized in that, The elastic diaphragm (5) is made of silicone rubber, fluororubber, or nitrile rubber.

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