Piezoelectric fluid injection valve

Abstract

The utility model discloses a piezoelectric fluid injection valve, which is characterized in that the lower end of a rotary adjusting screw rod arranged on a valve body is contacted with the upper surface of the left end of a first lever, and the lower surface of the left end of a second lever is contacted with the upper end surface of a firing pin; the lower end of the firing pin with the upper portion located in the containing groove penetrates into the glue outlet runner of the glue inlet body and is matched with the nozzle, a guide sleeve allowing the firing pin to penetrate through is arranged at an opening in the lower end of the valve body, and a flange part facing outwards in the radial direction is arranged at the upper end of the firing pin. A reset spring is arranged between the lower end face of the flange part and the guide sleeve, the reset spring and the outer side of the guide sleeve are sleeved with a second spring, and the second spring coaxial with the reset spring is located between the lower surface of the left end of the second lever and the inner wall of the bottom of the containing groove. According to the utility model, the consistency of the impact force between the firing pin and the nozzle in the repeated high-frequency movement process can be improved, and the glue outlet precision and the stability in the long-term use process are improved.

Description

Technical Field

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

[0002] Piezoelectric jet valves utilize the inverse piezoelectric effect of piezoelectric materials, offering advantages such as high jetting frequency and simple equipment structure. Furthermore, by using a piezoelectric structure to control the stroke of the ejector pin, they achieve precise dispensing. The main principle of the piezoelectric valve is as follows: an amplifier amplifies the deformation of the piezoelectric ceramic in the piezoelectric actuator after energization, using a lever principle, and transmits this amplification to the jetting pusher in the flow channel assembly. This pusher then ejects the adhesive from the flow channel assembly. However, the high-frequency impact jetting can lead to poor stability. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a piezoelectric fluid jet valve, which can improve the consistency of the impact force between the impact pin and the nozzle during repeated high-frequency movement, improve the accuracy of dispensing and the stability during long-term use.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a piezoelectric fluid jet valve, comprising: a valve body with an internal receiving groove, an inlet body mounted on the lower end face of the valve body, a nozzle mounted on the inlet body, a striking pin configured to cooperate with the nozzle, and a first lever, a piezoelectric column, and a second lever arranged sequentially from top to bottom within the receiving groove. The inlet body has an inlet channel and an outlet channel respectively. The lower end of the outlet channel, whose upper end communicates with the inlet channel, communicates with the nozzle. The right end of the first lever and the inner wall of the receiving groove above it are connected by a mutually cooperating first protrusion. The first groove is rotatably connected. The right end of the second lever is rotatably connected to the inner wall of the receiving groove below it through a mutually cooperating second protrusion and the second groove. The upper end of the piezoelectric column is rotatably contacted with the first lever through a mutually cooperating third protrusion and the third groove. The lower end of the piezoelectric column is rotatably contacted with the second lever through a mutually cooperating fourth protrusion and the fourth groove. The third protrusion and the third groove are located near the right end of the first lever and are located to the left of the first protrusion and the first groove. The fourth protrusion and the fourth groove are located near the right end of the second lever and are located to the left of the second protrusion and the second groove.

[0005] A support column is provided in the receiving groove of the valve body and below the left end of the first lever. A first spring is provided between the support column and the lower surface of the left end of the first lever. The lower end of a rotary screw installed on the valve body contacts the upper surface of the left end of the first lever. The lower surface of the left end of the second lever contacts the upper end face of the striker. The lower end of the striker, located in the receiving groove, passes through the glue outlet channel of the glue inlet body and cooperates with the nozzle. A guide sleeve for the striker to pass through is provided at the lower opening of the valve body. The upper end of the striker has a radially outward flange. A return spring is provided between the lower end face of this flange and the guide sleeve. A second spring is fitted on the outside of the return spring and the guide sleeve. The second spring, coaxial with the return spring, is located between the lower surface of the left end of the second lever and the inner wall of the bottom of the receiving groove.

[0006] The following are further improvements to the above technical solution:

[0007] 1. In the above scheme, the surface on the rotary screw that contacts the upper surface of the left end of the first lever is a spherical surface.

[0008] 2. In the above scheme, the surfaces that cooperate with each other between the first protrusion and the first groove, the second protrusion and the second groove, the third protrusion and the third groove, and the fourth protrusion and the fourth groove are all arc surfaces.

[0009] 3. In the above scheme, the first protrusion is formed on the upper surface of the right end of the first lever, and the first groove into which the first protrusion is embedded is formed on the inner wall of the receiving groove.

[0010] 4. In the above scheme, the second groove is formed on the lower surface of the right end of the second lever, and the second protrusion is provided on the inner wall of the receiving groove.

[0011] 5. In the above scheme, the third protrusion is disposed at the upper end of the piezoelectric column, and the third groove is formed on the lower surface of the first lever.

[0012] 6. In the above scheme, the fourth protrusion is integrally formed on the upper surface of the second lever, and the fourth groove is formed on the lower end face of the piezoelectric column.

[0013] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0014] This utility model relates to a piezoelectric fluid jet valve. A support column is located within the receiving groove of the valve body, below the left end of a first lever. A first spring is positioned between the support column and the lower surface of the left end of the first lever. The lower end of a rotary screw mounted on the valve body contacts the upper surface of the left end of the first lever. The lower surface of the left end of the second lever contacts the upper end face of a striking pin. The lower end of the striking pin, located within the receiving groove, penetrates the dispensing channel of the glue inlet body and engages with the nozzle. A guide sleeve is provided at the lower opening of the valve body for the striking pin to pass through. The upper end of the firing pin has a radially outward flange. A return spring is provided between the lower end face of this flange and the guide sleeve. A second spring is fitted on the outer side of the guide sleeve and the return spring. The second spring, which is coaxial with the return spring, is located between the lower surface of the left end of the second lever and the inner wall of the bottom of the receiving groove. This can improve the stability of the second lever and the firing pin that moves with the second lever during repeated high-frequency movement, as well as the consistency of the glue dispensing gap formed between the firing pin and the nozzle and the impact force between them, thereby improving the glue dispensing accuracy and stability during long-term use. Attached Figure Description

[0015] Appendix Figure 1 This is a schematic diagram of the structure of the piezoelectric fluid jet valve of this utility model;

[0016] Appendix Figure 2 This is a cross-sectional view of the structure of the piezoelectric fluid jet valve of this utility model;

[0017] Appendix Figure 3 for Figure 2 A partially enlarged schematic diagram of the upper and middle sections;

[0018] Appendix Figure 4 for Figure 2 A partially enlarged schematic diagram of the lower and middle sections;

[0019] Appendix Figure 5 for Figure 2 A partially enlarged schematic diagram of the bottom structure.

[0020] In the above attached figures: 1. Inlet body; 2. Nozzle; 3. Impact pin; 31. Flange; 41. Inlet channel; 42. Outlet channel; 51. Mounting protrusion; 52. Mounting base; 14. Guide sleeve; 15. Return spring; 21. Receiving groove; 22. Valve body; 23. First lever; 231. First protrusion; 232. First groove; 24. Piezoelectric column; 241. Third protrusion; 242. Third groove; 243. Fourth protrusion; 244. Fourth groove; 25. Second lever; 251. Second protrusion; 252. Second groove; 26. Support column; 271. First spring; 272. Second spring; 28. Adjusting screw. Detailed Implementation

[0021] The present patent can be further understood through the specific embodiments given below, but they are not intended to limit the present patent.

[0022] Example 1: A piezoelectric fluid jet valve includes: a valve body 22 with an internal receiving groove 21, an inlet body 1 mounted on the lower end face of the valve body 22, a nozzle 2 mounted on the inlet body 1, a striking pin 3 cooperating with the nozzle 2, and a first lever 23, a piezoelectric column 24, and a second lever 25 arranged sequentially from top to bottom within the receiving groove 21. The inlet body 1 has an inlet channel 41 and an outlet channel 42 respectively. The outlet channel 42, whose upper end communicates with the inlet channel 41, communicates with the nozzle 2 at its lower end. The right end of the first lever 23 is rotatably connected to the inner wall of the receiving groove 21 above it via a first protrusion 231 and a first groove 232 that cooperate with each other. The right end of the second lever 25... The piezoelectric column 24 is rotatably connected to the inner wall of the receiving groove 21 located below it through a second protrusion 251 and a second groove 252 that cooperate with each other. The upper end of the piezoelectric column 24 is rotatably contacted to the first lever 23 through a third protrusion 241 and a third groove 242 that cooperate with each other. The lower end of the piezoelectric column 24 is rotatably contacted to the second lever 25 through a fourth protrusion 243 and a fourth groove 244 that cooperate with each other. The third protrusion 241 and the third groove 242 are located near the right end of the first lever 23 and are located to the left of the first protrusion 231 and the first groove 232. The fourth protrusion 243 and the fourth groove 244 are located near the right end of the second lever 25 and are located to the left of the second protrusion 251 and the second groove 252.

[0023] A support column 26 is disposed within the receiving groove 21 of the valve body 22 and below the left end of the first lever 23. A first spring 271 is disposed between the support column 26 and the lower surface of the left end of the first lever 23. The lower end of a rotary screw 28 mounted on the valve body 22 contacts the upper surface of the left end of the first lever 23. The lower surface of the left end of the second lever 25 contacts the upper end face of the striker 3. The lower end of the striker 3, located in the receiving groove 21, penetrates into the glue outlet channel 42 of the glue inlet body 1 and... The nozzle 2 is used in conjunction with a guide sleeve 14 provided at the lower opening of the valve body 22 for the striker 3 to pass through. The upper end of the striker 3 has a radially outward flange 31. A return spring 15 is provided between the lower end face of the flange 31 and the guide sleeve 14. A second spring 272 is fitted on the outside of the return spring 15 and the guide sleeve 14. The second spring 272, which is coaxially arranged with the return spring 15, is located between the lower surface of the left end of the second lever 25 and the inner wall of the bottom of the receiving groove 21.

[0024] The glue enters the glue inlet channel 41 on the glue inlet body 1 and then enters the glue outlet channel 42. The lower end of the impact pin 3, which cooperates with the nozzle 2, penetrates into the glue outlet channel 42. Through repeated impacts between the impact pin 3 and the nozzle 2, the glue in the glue outlet channel 42 is sprayed out from the lower end of the nozzle 2 to perform the glue dispensing operation.

[0025] The surface of the aforementioned adjusting screw 28 that contacts the upper surface of the left end of the first lever 23 is a spherical surface; the aforementioned first protrusion 231 is formed on the upper surface of the right end of the first lever 23, and the aforementioned first groove 232 into which the first protrusion 231 is inserted is opened on the inner wall of the receiving groove 21.

[0026] The lower surface of the aforementioned glue-feeding body 1 has a mounting protrusion 51, and the aforementioned nozzle 2 is mounted on the lower end face of the aforementioned mounting protrusion 51 via a mounting seat 52; the aforementioned mounting seat 52, which has internal threads, and the mounting protrusion 51, which has external threads, are connected by threads.

[0027] Example 2: A piezoelectric fluid jet valve includes: a valve body 22 with an internal receiving groove 21, an inlet body 1 mounted on the lower end face of the valve body 22, a nozzle 2 mounted on the inlet body 1, a striking pin 3 cooperating with the nozzle 2, and a first lever 23, a piezoelectric column 24, and a second lever 25 arranged sequentially from top to bottom within the receiving groove 21. The inlet body 1 has an inlet channel 41 and an outlet channel 42 respectively. The outlet channel 42, whose upper end communicates with the inlet channel 41, communicates with the nozzle 2 at its lower end. The right end of the first lever 23 is rotatably connected to the inner wall of the receiving groove 21 above it via a first protrusion 231 and a first groove 232 that cooperate with each other. The right end of the second lever 25... The piezoelectric column 24 is rotatably connected to the inner wall of the receiving groove 21 located below it through a second protrusion 251 and a second groove 252 that cooperate with each other. The upper end of the piezoelectric column 24 is rotatably contacted to the first lever 23 through a third protrusion 241 and a third groove 242 that cooperate with each other. The lower end of the piezoelectric column 24 is rotatably contacted to the second lever 25 through a fourth protrusion 243 and a fourth groove 244 that cooperate with each other. The third protrusion 241 and the third groove 242 are located near the right end of the first lever 23 and are located to the left of the first protrusion 231 and the first groove 232. The fourth protrusion 243 and the fourth groove 244 are located near the right end of the second lever 25 and are located to the left of the second protrusion 251 and the second groove 252.

[0028] A support column 26 is provided in the receiving groove 21 of the valve body 22 and below the left end of the first lever 23. A first spring 271 is provided between the support column 26 and the lower surface of the left end of the first lever 23. The lower end of a rotary screw 28 mounted on the valve body 22 contacts the upper surface of the left end of the first lever 23. The lower surface of the left end of the second lever 25 contacts the upper end face of the impact pin 3. The lower end of the impact pin 3, located in the receiving groove 21, passes through the glue outlet channel 42 of the glue inlet body 1 and cooperates with the nozzle 2. A guide sleeve 14 is provided at the lower opening of the valve body 22 for the impact pin 3 to pass through. The upper end of the impact pin 3 has a A flange portion 31 extends radially outward. A return spring 15 is provided between the lower end face of this flange portion 31 and the guide sleeve 14. A second spring 272 is fitted on the outer side of the return spring 15 and the guide sleeve 14. The second spring 272, which is coaxially arranged with the return spring 15, is located between the lower surface of the left end of the second lever 25 and the inner wall of the bottom of the receiving groove 21. The return spring 15 of the striker promotes the striker to quickly return to the raised state, so that a gap is formed between the striker and the nozzle, which facilitates the rapid entry of fluid. The return spring of the second lever (i.e., the second spring 272) promotes the rapid rebound of the lever after the piezoelectric ceramic shortens, which protects the piezoelectric ceramic and facilitates the rapid raising of the striker.

[0029] When the piezoelectric column 24 is energized, it expands downward to create a thrust on the right end of the second lever 25, causing the left end of the second lever 25, which rotates around the second protrusion 251, to push the striker 3 downward to strike the nozzle 2 and dispense glue. When the piezoelectric column 24 is de-energized, it retracts, and the nested reset spring 15 and the second spring 272 reset respectively, causing the striker 2 and the second lever 25 to return to their initial positions.

[0030] The surfaces that mate with each other between the first protrusion 231 and the first groove 232, the second protrusion 251 and the second groove 252, the third protrusion 241 and the third groove 242, and the fourth protrusion 243 and the fourth groove 244 are all arc surfaces.

[0031] The first protrusion 231 is formed on the upper surface of the right end of the first lever 23, and the first groove 232 into which the first protrusion 231 is inserted is opened on the inner wall of the receiving groove 21; the second groove 252 is opened on the lower surface of the right end of the second lever 25, and the second protrusion 251 is disposed on the inner wall of the receiving groove 21.

[0032] The third protrusion 241 is disposed on the upper end of the piezoelectric column 24, and the third groove 242 is formed on the lower surface of the first lever 23; the fourth protrusion 243 is integrally formed on the upper surface of the second lever 25, and the fourth groove 244 is formed on the lower end surface of the piezoelectric column 24.

[0033] In use, the glue enters the glue inlet channel on the glue inlet body and then enters the glue outlet channel. The lower end of the ejector pin, which cooperates with the nozzle, penetrates into the glue outlet channel. Through repeated impacts between the ejector pin and the nozzle, the glue in the glue outlet channel is sprayed out from the lower end of the nozzle to perform the dispensing operation. Specifically: after the piezoelectric column is energized, it expands downward to create a thrust on the right end of the second lever, which causes the left end of the second lever, which rotates around the second protrusion, to push the ejector pin downward to strike the nozzle and dispense glue. After the piezoelectric column is de-energized, it retracts, and the nested reset spring and the second spring reset respectively, so that the ejector pin and the second lever return to their initial positions. The excitation voltage of the piezoelectric column is a square wave. Therefore, the ejector pin performs high-speed reciprocating motion under the action of the piezoelectric column, so that the glue can be continuously sprayed out from the nozzle.

[0034] When the above-mentioned piezoelectric fluid jet valve is used, it can improve the stability of the second lever and the impact pin that moves with the second lever during repeated high-frequency movement, as well as the consistency of the dispensing gap formed between the impact pin and the nozzle and the impact force between them, thereby improving the dispensing accuracy and stability during long-term use.

[0035] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A piezoelectric fluid ejection valve, comprising: The valve body (22) has an internal receiving groove (21), an inlet body (1) mounted on the lower end face of the valve body (22), a nozzle (2) mounted on the inlet body (1), a striker (3) that cooperates with the nozzle (2), and a first lever (23), a piezoelectric column (24), and a second lever (25) arranged sequentially from top to bottom in the receiving groove (21). The inlet body (1) has an inlet channel (41) and an outlet channel (42) respectively. The outlet channel (42), whose upper end is connected to the inlet channel (41), is connected to the nozzle (2) at its lower end. The first lever (23) is rotatably connected to the inner wall of the receiving groove (21) above it through a first protrusion (231) and a first groove (232) that cooperate with each other. The second lever (25) is connected to the inner wall of the receiving groove (21) above it through a first protrusion (231) and a first groove (232) that cooperate with each other. The inner walls of the lower receiving groove (21) are rotatably connected by a second protrusion (251) and a second groove (252) that cooperate with each other. The upper end of the piezoelectric column (24) is rotatably contacted with the first lever (23) by a third protrusion (241) and a third groove (242) that cooperate with each other. The lower end of the piezoelectric column (24) is rotatably contacted with the second lever (25) by a fourth protrusion (243) and a fourth groove (244) that cooperate with each other. The third protrusion (241) and the third groove (242) are located near the right end of the first lever (23) and are located to the left of the first protrusion (231) and the first groove (232). The fourth protrusion (243) and the fourth groove (244) are located near the right end of the second lever (25) and are located to the left of the second protrusion (251) and the second groove (252). A support column (26) is provided in the receiving groove (21) of the valve body (22) and below the left end of the first lever (23). A first spring (271) is provided between the support column (26) and the lower surface of the left end of the first lever (23). The lower end of a rotary screw (28) mounted on the valve body (22) contacts the upper surface of the left end of the first lever (23). The lower surface of the left end of the second lever (25) contacts the upper end face of the striker (3). The lower end of the striker (3) located in the receiving groove (21) penetrates into the glue outlet channel (42) of the glue inlet body (1) and is in contact with the glue outlet channel (42) of the glue inlet body (1). The nozzle (2) is fitted with a guide sleeve (14) at the lower opening of the valve body (22) for the striker (3) to pass through. The upper end of the striker (3) has a radially outward flange (31). A return spring (15) is provided between the lower end face of the flange (31) and the guide sleeve (14). A second spring (272) is fitted on the outside of the guide sleeve (14) and the return spring (15). The second spring (272) is coaxially arranged with the return spring (15) and is located between the lower surface of the left end of the second lever (25) and the inner wall of the bottom of the receiving groove (21).

2. The piezoelectric fluid jet valve according to claim 1, characterized in that: The surface of the rotary screw (28) that contacts the upper surface of the left end of the first lever (23) is a spherical surface.

3. The piezoelectric fluid jet valve according to claim 1, characterized in that: The surfaces that mate with each other between the first protrusion (231) and the first groove (232), the second protrusion (251) and the second groove (252), the third protrusion (241) and the third groove (242), and the fourth protrusion (243) and the fourth groove (244) are all arc surfaces.

4. The piezoelectric fluid jet valve according to claim 1 or 3, characterized in that: The first protrusion (231) is formed on the upper surface of the right end of the first lever (23), and the first groove (232) into which the first protrusion (231) is inserted is opened on the inner wall of the receiving groove (21).

5. The piezoelectric fluid injection valve according to claim 1 or 3, characterized in that: The second groove (252) is formed on the lower surface of the right end of the second lever (25), and the second protrusion (251) is provided on the inner wall of the receiving groove (21).

6. The piezoelectric fluid jet valve according to claim 1 or 3, characterized in that: The third protrusion (241) is disposed at the upper end of the piezoelectric column (24), and the third groove (242) is formed on the lower surface of the first lever (23).

7. The piezoelectric fluid jet valve according to claim 1 or 3, characterized in that: The fourth protrusion (243) is integrally formed on the upper surface of the second lever (25), and the fourth groove (244) is formed on the lower end face of the piezoelectric column (24).

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