Piezoelectric injection valve and glue injection apparatus

Abstract

The utility model discloses a piezoelectric injection valve and glue spraying equipment relates to point gum device technical field, wherein, piezoelectric injection valve is used to install liquid storage cylinder and sprays the fluid in liquid storage cylinder, and piezoelectric injection valve includes valve body, movable injection device and check valve subassembly, and the outer wall of valve body is equipped with the fixing piece for fixing liquid storage cylinder, and valve body forms fluid transmission channel and the liquid inlet and liquid outlet of intercommunication fluid transmission channel, and the liquid inlet is used for intercommunication liquid storage cylinder, movable injection device is located at valve body, and movable injection device moves and blocks in liquid outlet, check valve subassembly is located at valve body, and check valve subassembly is used to block or conduct fluid transmission channel. The utility model discloses a technical scheme through setting up check valve subassembly to block or conduct the fluid transmission channel, has improved the consistency of piezoelectric injection valve injection.

Description

Technical Field

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

[0002] Piezoelectric jet valves are widely used in high-speed, controlled-flow dispensing of various fluid materials, such as surface mount adhesives, conductive silver pastes, underfill adhesives, sealants, and surface coating adhesives. Traditional piezoelectric jet valves typically utilize the length change of the piezoelectric ceramic to drive a lever mechanism, which in turn drives a striker to perform high-frequency motion to complete the jetting. However, due to the compressibility and fluidity of the fluid, backflow can easily occur during jetting, leading to unstable liquid flow and affecting the consistency of the jetting. Utility Model Content

[0003] The main purpose of this invention is to provide a piezoelectric jet valve and adhesive spraying equipment, which aims to improve the consistency of the piezoelectric jet valve during spraying.

[0004] To achieve the above objectives, the present invention proposes a piezoelectric injection valve for installing a liquid storage tank and injecting fluid from the liquid storage tank. The piezoelectric injection valve includes: The valve body has a fixing member on its outer wall for fixing the liquid storage cylinder. The valve body forms a fluid transmission channel and an inlet and an outlet that communicate with the fluid transmission channel. The inlet is used to communicate with the liquid storage cylinder. A movable spraying device is disposed on the valve body, and the movable spraying device is movably sealed to the liquid outlet; and A check valve assembly is disposed in the valve body, and the check valve assembly is used to block or open the fluid transmission channel.

[0005] In one embodiment, the fluid transport channel has an opening, and the check valve assembly includes a valve needle movably disposed along its axial direction through the opening, such that the valve needle has a first position for opening the fluid transport channel and a second position for blocking the fluid transport channel.

[0006] In one embodiment, the fluid transmission channel includes two spaced-apart transmission sections, the gap between the two transmission sections forming the through port, and the valve needle forming a liquid passage. At the first position, the liquid passage is connected to the two transmission sections respectively, and at the second position, the ports of the two transmission sections at their closest ends are positioned opposite to the outer peripheral wall of the valve needle.

[0007] In one embodiment, there is a gap between the ports of the two transmission segments at their closest points to each other and the valve needle.

[0008] In one embodiment, the two transmission segments are configured as a first transmission segment connecting the liquid inlet and a second transmission segment connecting the liquid outlet, wherein the length of the second transmission segment is less than or equal to the length of the first transmission segment.

[0009] In one embodiment, the valve body has a receiving cavity, and the fluid transmission channel is formed in the receiving cavity. The valve needle passes through the receiving cavity. The piezoelectric injection valve also includes a sealing element disposed in the receiving cavity. The sealing element is connected to the inner wall surface of the receiving cavity and is sleeved on the outer side of the valve needle. The inner peripheral wall of the sealing element has a lip that abuts against the valve needle.

[0010] In one embodiment, the check valve assembly further includes a first drive member and a first transmission assembly disposed on the valve body, the first drive member being driven to connect the first transmission assembly, and the first transmission assembly being movably connected to the valve needle to move the valve needle along its axial direction.

[0011] In one embodiment, the valve body includes a first housing portion, a second housing portion, and a third housing portion connected to each other. The first housing portion and the second housing portion are disposed opposite to each other. The fixing member is connected to the outer side wall of the first housing portion and the second housing portion. A first receiving groove is formed on the side of the first housing portion away from the second housing portion, and the first driving member and the first transmission assembly are located in the first receiving groove. A second receiving groove is formed on the side of the second housing portion away from the first housing portion, and the movable injection device is located in the second receiving groove. The fluid transmission channel is formed inside the third shell. The first shell and the second shell are located on the same side of the third shell. The liquid outlet is formed on the side of the third shell away from the second shell, and the liquid inlet is formed on the side of the first shell away from the second shell. The valve needle passes through the third shell and is movably connected to the first shell.

[0012] In one embodiment, the movable spraying device includes a second driving member, a second transmission assembly, and a striking pin assembly. The second driving member is connected to the sidewall of the second receiving groove. The second transmission assembly is movably connected to the sidewall of the second receiving groove and abuts against the second driving member. The striking pin assembly abuts between the end of the second transmission assembly facing away from the second driving member and the sidewall of the second receiving groove. The end of the striking pin assembly facing away from the second transmission assembly passes through the fluid transmission channel and movably seals the liquid outlet.

[0013] In one embodiment, both the first shell portion and the second shell portion are provided with heat dissipation components, which are located on the outer side walls of the corresponding shell portions.

[0014] This utility model also proposes a glue spraying device, including the aforementioned piezoelectric spray valve.

[0015] The technical solution of this utility model blocks or opens the fluid transmission channel by setting a check valve assembly, so as to block the fluid backflow path during the injection process of the piezoelectric injection valve, effectively reducing fluid backflow and compression phenomena. This helps to avoid pressure fluctuations and unstable liquid output caused by fluid compressibility or fluidity, thereby improving the consistency of the piezoelectric injection valve during injection and improving the accuracy of fluid output. Attached Figure Description

[0016] 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 the structures shown in these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the structure of an embodiment of the piezoelectric injection valve provided by this utility model; Figure 2 A structural schematic diagram of the piezoelectric injection valve provided by this utility model from another perspective; Figure 3 for Figure 1 A partial cross-sectional view of the piezoelectric injection valve in the image; Figure 4 This is a partial perspective view of the piezoelectric injection valve when the valve needle is in the first position. Figure 5 This is a partial cross-sectional view of the piezoelectric injection valve when the valve needle is in the second position; Figure 6 for Figure 2 A partial cross-sectional view of the piezoelectric injection valve in the image.

[0018] Explanation of icon numbers: 10. Piezoelectric injection valve; 20. Liquid reservoir; 100. Valve body; 200. Movable injection device; 300. Check valve assembly; 400. Seal; 500. Heat sink; 600. Fixing component; 110. First housing; 111. First receiving groove; 120. Second housing; 121. Second receiving groove; 130. Third housing; 131. Receiving cavity; 132. Fluid transmission channel; 1321. First transmission section; 1322. Second transmission section; 133. Liquid inlet; 134. Liquid outlet; 210. Second drive component; 220. Second transmission assembly; 230. Impact pin assembly; 310. Valve needle; 311. Liquid passage; 320. First drive component; 330. First transmission assembly; 410. Lip.

[0019] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0021] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0022] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0023] This utility model proposes a piezoelectric injection valve.

[0024] Please see Figure 1 , Figures 3 to 5In one embodiment of this utility model, the piezoelectric jet valve 10 is used to install a liquid storage cylinder 20 and jet the fluid inside the liquid storage cylinder 20. The piezoelectric jet valve 10 includes a valve body 100, a movable jetting device 200, and a check valve assembly 300. The outer wall of the valve body 100 is provided with a fixing member 600 for fixing the liquid storage cylinder 20. The valve body 100 forms a fluid transmission channel 132 and an inlet 133 and an outlet 134 that connect to the fluid transmission channel 132. The inlet 133 is used to connect to the liquid storage cylinder 20. The movable jetting device 200 is disposed on the valve body 100 and is movablely blocked at the outlet 134. The check valve assembly 300 is disposed on the valve body 100 and is used to block or open the fluid transmission channel 132.

[0025] Specifically, a fixing member 600 is provided on the outer wall of the valve body 100 for mounting the liquid storage cylinder 20. The fixing member 600 has an arc-shaped groove with an opening. When installing the liquid storage cylinder 20, the liquid storage cylinder 20 is clamped into the arc-shaped groove of the fixing member 600 through the opening, thereby fixing the liquid storage cylinder 20. The opening on the fixing member 600 facilitates the replacement and installation of the liquid storage cylinder 20. A fluid transmission channel 132 for fluid flow is formed inside the valve body 100, and inlet ports 133 and outlet ports 134 connected to the fluid transmission channel 132 are formed at both ends of the valve body 100. The opening of the liquid storage cylinder 20 is connected to the inlet port 133. Under the squeezing action of the squeezing member, the fluid in the liquid storage cylinder 20 flows into the fluid transmission channel 132 through the inlet port 133 and flows along the fluid transmission channel 132 towards the outlet port 134.

[0026] The movable spraying device 200 is located within the valve body 100 and is movably sealed at the outlet 134 to open and close the outlet 134, controlling the spraying of fluid. By aligning the outlet 134 with the target location to be sprayed, fluid is sprayed along the outlet 134 to the target location. By setting the movable spraying device 200 to movably seal the outlet 134, the extruder and the movable spraying device 200 work simultaneously, so that each time the movable spraying device 200 moves, a certain amount of fluid is sprayed from the outlet 134. During the fluid spraying process, the movable spraying device 200 moves at high speed and controls the overall movement of the piezoelectric spray valve 10, thus connecting the dots of fluid sprayed from the outlet 134 into a line to complete the operation at the target location. The fluid can be conductive silver paste, various adhesives, or other liquids that require spraying. For example, with adhesives, connecting the dots sprayed from the outlet 134 into a line completes the application of adhesive to the target location.

[0027] Because fluids possess a certain degree of compressibility and fluidity, backflow can easily occur during injection, leading to unstable output. This invention addresses this by incorporating a check valve assembly 300, which blocks the backflow path during injection, effectively reducing fluid backflow and compression. This ensures a more consistent pressure state for the fluid during each injection, thereby guaranteeing consistent output. Even with complex fluids possessing certain viscosity and compressibility, such as conductive silver paste and underfill adhesives, it maintains excellent injection performance. The piezoelectric injection valve 10 is particularly suitable for industrial applications requiring high precision and stability, such as electronic packaging and chip bonding.

[0028] Understandably, please refer to Figure 4 When the movable injection device 200 is raised to allow liquid to enter, the check valve assembly 300 opens the fluid transmission channel 132, allowing the fluid in the storage tank 20 to smoothly reach the outlet 134 through the fluid transmission channel 132; please refer to Figure 5 When the active jet device 200 presses down to discharge liquid, the check valve assembly 300 blocks the fluid transmission channel 132, preventing fluid near the outlet 134 from flowing back towards the inlet 133 through the fluid transmission channel 132. Simultaneously, because the check valve assembly 300 blocks the fluid transmission channel 132, the space at the end of the fluid transmission channel 132 near the outlet 134 is reduced, confining the fluid near the outlet 134 to a small volume. Even if the fluid is compressed, its impact is limited to a localized area, reducing overall pressure fluctuations. Therefore, by using the check valve assembly 300 to block or open the fluid transmission channel 132, it is beneficial to avoid pressure fluctuations and unstable discharge caused by fluid compressibility or flowability, thereby improving the consistency of the piezoelectric jet valve 10's spray and increasing the accuracy of the fluid discharge volume.

[0029] The technical solution of this utility model is to block or open the fluid transmission channel 132 by setting a check valve assembly 300, so that it blocks the backflow path of the fluid during the injection process of the piezoelectric injection valve 10, effectively reducing fluid backflow and compression phenomena, thereby helping to avoid pressure fluctuations and unstable liquid output caused by fluid compressibility or fluidity, and thus improving the consistency of the injection of the piezoelectric injection valve 10 and improving the accuracy of fluid output.

[0030] In one implementation, please refer to Figures 3 to 5 The fluid transmission channel 132 has an outlet, and the check valve assembly 300 includes a valve needle 310 that is movably disposed in the outlet along its axial direction, such that the valve needle 310 has a first position that opens the fluid transmission channel 132 and a second position that blocks the fluid transmission channel 132.

[0031] The opening can be an opening formed in the inner wall of the fluid transmission channel 132, or it can be a channel section provided in the fluid transmission channel 132, for the valve needle 310 of the check valve assembly 300 to pass through, so that the valve needle 310 can move along its axial direction, thereby opening or blocking the fluid transmission channel 132.

[0032] The valve needle 310 has a cylindrical or conical structure and is movable along its axial direction, thus having a first position and a second position. (See also...) Figure 4 During the liquid aspiration or preparation phase, the valve needle 310 moves to the first position, the fluid transmission channel 132 is open, and the fluid can flow smoothly from the inlet 133 to the outlet 134. (See also...) Figure 5 During the injection process, when the movable injection device 200 is pressed down, the valve needle 310 moves to the second position, the fluid transmission channel 132 is blocked, the valve needle 310 prevents the fluid from flowing back, and realizes the anti-backflow function, thereby effectively reducing the fluid backflow and compression phenomenon during the injection process of the piezoelectric injection valve 10. This helps to avoid pressure fluctuations and unstable liquid output caused by fluid compressibility or fluidity, thereby improving the consistency and accuracy of the piezoelectric injection valve 10 during injection.

[0033] The movement of the valve needle 310 can be achieved by mechanical linkage, hydraulic differential, spring return, or electromagnetic drive. The valve needle 310 achieves the function of opening and closing the fluid transmission channel 132 through axial movement. The valve needle 310 is not only simple in structure and stable in action, but also has a fast response speed. It can move synchronously with the movable injection device 200 (such as a piezoelectric ceramic driven impact pin). During high-speed liquid discharge operation, it can achieve rapid opening and closing, ensuring the accuracy and continuity of the work.

[0034] In other embodiments, the check valve assembly 300 may also be a one-way valve. The fluid transmission channel 132 does not have an outlet, and the one-way valve is directly fixedly installed in the fluid transmission channel 132. The one-way valve can unidirectionally guide the fluid in the fluid transmission channel 132 near the inlet 133 to the outlet 134, thereby blocking the backflow path of the fluid during the injection process of the piezoelectric injection valve 10.

[0035] In one implementation, please refer to Figures 3 to 5 The fluid transmission channel 132 includes two transmission sections spaced apart, with the gap between the two transmission sections forming an opening. The valve needle 310 forms a liquid passage 311. In the first position, the liquid passage 311 is connected to the two transmission sections respectively. In the second position, the ports of the two transmission sections at their closest ends are positioned opposite to the outer peripheral wall of the valve needle 310.

[0036] The gap between the two transmission sections forms an orifice, one located upstream and the other downstream. This orifice serves as the movement space for the valve needle 310, allowing it to move axially to control the flow of fluid. The valve needle 310 internally contains a fluid passage 311; please refer to [reference needed]. Figure 4 When the valve needle 310 moves to the first position, the liquid passage 311 aligns with the ports of the two transmission sections closest to each other, thus connecting the two transmission sections. The fluid flows sequentially along the path of the storage tank 20, inlet 133, upstream transmission section (i.e., first transmission section 1321), liquid passage 311, downstream transmission section (i.e., second transmission section 1322), and outlet 134. Please refer to [link / reference]. Figure 5 When the valve needle 310 moves to the second position, the ports of the two transmission sections at their closest ends are offset from the liquid passage 311 and are opposite to the outer peripheral wall of the valve needle 310, so as to block the connection between the two transmission sections. The fluid at the outlet 134 cannot flow back to the inlet 133 side, avoiding backflow and flow fluctuation caused by fluid compressibility. The fluid can only be ejected at high speed from the outlet 134 to complete the dispensing or spraying operation and ensure stable spraying.

[0037] In other embodiments, the port is an opening formed on one side wall of the fluid transmission channel 132. When the valve needle 310 moves to the second position, the valve needle 310 is inserted into the fluid transmission channel 132 from the port and abuts against the other side wall opposite to the port to block the flow path of the fluid. When the valve needle 310 moves to the first position, there is a gap between the other side wall opposite to the port and the valve needle 310, and the fluid can flow from the gap to the outlet 134.

[0038] In one embodiment, there is a gap between the ports of the two transmission segments at their respective ends and the valve needle 310.

[0039] During the movement of the valve needle 310, the gap prevents the valve needle 310 from directly and rigidly contacting the transmission section port, reducing the risk of wear and jamming, ensuring the valve needle 310 operates flexibly and reliably, and improving the stability and durability of the valve needle 310 during long-term use. Moreover, the existence of a small gap allows for a certain degree of tolerance, reducing manufacturing costs and difficulty.

[0040] It is worth mentioning that the gap between the valve needle 310 and the transmission section is very small, much smaller than the effective flow channel for fluid. When the valve needle 310 is in the first position, the fluid flow velocity is very high, and this gap does not affect the connectivity of the fluid passage 311; the fluid can still pass smoothly through the fluid transmission channel 132. When the valve needle 310 is in the second position, during the injection process, due to the high-speed compression of the fluid by the movable injection device 200, the resistance of the fluid passing through this tiny gap is extremely high, almost equivalent to being blocked. This allows for a good anti-backflow effect even without complete sealing.

[0041] In other embodiments, there may be no gap between the ports of the two transmission segments at their respective ends and the valve needle 310, and the end faces of the ports may fit against the outer peripheral wall of the valve needle 310, and both may be coated with a wear-resistant coating, a smooth coating, etc.

[0042] In one implementation, please refer to Figures 3 to 5 The two transmission segments are configured as a first transmission segment 1321 connecting the liquid inlet 133 and a second transmission segment 1322 connecting the liquid outlet 134, wherein the length of the second transmission segment 1322 is less than or equal to the length of the first transmission segment 1321.

[0043] The first transmission section 1321 is the channel from the inlet 133 to the outlet, and the second transmission section 1322 is the channel from the outlet to the outlet 134. The lengths of the first transmission section 1321 and the second transmission section 1322 can be the same, or the first transmission section 1321 can be relatively longer and the second transmission section 1322 relatively shorter. The longer first transmission section 1321 helps maintain the stability of fluid input. The shorter second transmission section 1322 reduces the volume change of the fluid under pressure, weakens the impact of pressure fluctuations on the spray volume, reduces spraying errors caused by fluid compressibility, and improves dispensing accuracy. The check valve assembly 300 only needs to block the fluid in a small space, resulting in a faster response and better effect. The fluid is more easily propelled out by the movable spray device 200, which helps to achieve high-speed, high-frequency operations.

[0044] In other embodiments, the length of the second transmission segment 1322 may be greater than the length of the first transmission segment 1321, and the outlet may be located closer to the midpoint of the fluid transmission channel 132.

[0045] In one implementation, please refer to Figure 3 and Figure 6 The valve body 100 has a receiving cavity 131, and a fluid transmission channel 132 is formed in the receiving cavity 131. The valve needle 310 passes through the receiving cavity 131. The piezoelectric injection valve 10 also includes a sealing member 400 disposed in the receiving cavity 131. The sealing member 400 is connected to the inner wall surface of the receiving cavity 131 and is sleeved on the outer side of the valve needle 310. The inner peripheral wall of the sealing member 400 has a lip 410 that abuts against the valve needle 310.

[0046] The valve body 100 has a receiving cavity 131, and a fluid transmission pipe is installed in the receiving cavity 131. The fluid transmission pipe forms a fluid transmission channel 132; or the fluid transmission channel 132 is integrally formed by the valve body 100; of course, in other embodiments, the valve body 100 may only form a cavity, which serves as the fluid transmission channel 132 and is equipped with a one-way valve.

[0047] In this embodiment, the valve needle 310 passes through the receiving cavity 131 and moves at the outlet of the fluid transmission channel 132. A small amount of fluid may flow into the receiving cavity 131 from the outlet. By providing a sealing element 400, fluid leakage from the gap between the valve needle 310 and the valve body 100 can be prevented. The sealing element 400 is disposed inside the receiving cavity 131 and connected to the inner wall surface of the receiving cavity 131, and surrounds the valve needle 310. The inner peripheral wall of the sealing element 400 is provided with a lip 410. During the injection process, the valve needle 310 moves axially. During this process, the lip 410 of the sealing element 400 always remains in contact with the outer peripheral wall of the valve needle 310, forming a dynamic seal. The lip 410 structure has a certain elastic deformation capability and can undergo slight deformation with the axial movement of the valve needle 310, ensuring that the valve needle 310 can still maintain good sealing performance during high-speed reciprocating motion. The seal 400 and the lip 410 are integrally molded and can be made of corrosion-resistant and wear-resistant elastic materials (such as fluororubber, silicone, etc.) to extend service life.

[0048] In other embodiments, the valve needle 310 and the drive structure for moving the valve needle 310 are both located in the receiving cavity 131. The valve needle 310 does not need to extend out of the valve body 100, and there is no gap between the valve needle 310 and the valve body 100, so there is no need to provide a sealing element 400.

[0049] In one implementation, please refer to Figure 2 and Figure 6 The check valve assembly 300 also includes a first drive member 320 and a first transmission assembly 330 disposed on the valve body 100. The first drive member 320 is driven to connect to the first transmission assembly 330. The first transmission assembly 330 is movably connected to the valve needle 310 so that the valve needle 310 moves along its axial direction.

[0050] The first driving element 320 is mounted on the valve body 100 and is electrically connected to an external control circuit. When connected, the first driving element 320 can generate high-frequency vibration to provide power. The first transmission assembly 330 is movably connected to the valve body 100 and to the first driving element 320. During the high-frequency vibration of the first driving element 320, it can drive the first transmission assembly 330 to move. The valve needle 310 abuts against the end of the first transmission assembly 330 opposite to the first driving element 320, and the end of the valve needle 310 opposite to the first transmission assembly 330 corresponds to the opening of the fluid transmission channel 132. The first transmission assembly 330 drives the valve needle 310 to move, thereby movably sealing the opening and thus blocking or opening the fluid transmission channel 132.

[0051] In one implementation, please refer to Figure 1 and Figure 2The valve body 100 includes a first housing portion 110, a second housing portion 120, and a third housing portion 130 connected to each other. The first housing portion 110 and the second housing portion 120 are arranged opposite to each other. A fixing member 600 is connected to the outer side wall of the first housing portion 110 and the second housing portion 120. A first receiving groove 111 is formed on the side of the first housing portion 110 opposite to the second housing portion 120. A first driving member 320 and a first transmission assembly 330 are located in the first receiving groove 111. A third housing portion 130 is formed on the side of the second housing portion 120 opposite to the first housing portion 110. There is a second receiving groove 121, and the movable spray device 200 is located in the second receiving groove 121; a fluid transmission channel 132 is formed in the third housing 130, the first housing 110 and the second housing 120 are located on the same side of the third housing 130, an outlet 134 is formed on the side of the third housing 130 away from the second housing 120, and an inlet 133 is formed on the side of the first housing 110 away from the second housing 120; a valve needle 310 passes through the third housing 130 and is movably connected to the first housing 110.

[0052] The fixing member 600 is connected to the outer wall of the first housing 110 and the second housing 120. The liquid storage cylinder 20 is installed on the end of the fixing member 600 opposite to the first housing 110 and the second housing 120. The fixing member 600 fixes the liquid storage cylinder 20 to the outer wall of the first housing 110 and the second housing 120, thereby enabling the liquid storage cylinder 20 to move synchronously with the valve body 100 for operation. The fixing member 600 can be fixedly connected to the outer wall of the first housing 110 and the second housing 120 by a screw, which facilitates installation and disassembly. The fixing member 600 connects the first housing 110 and the second housing 120 simultaneously, making the installation of the fixing member 600 more stable. Even if the fixing member 600 becomes loose from one housing, it can still be firmly installed on the other housing. In other embodiments, the fixing member 600 can be integrally formed with the first housing 110 or the second housing 120 to enhance the installation firmness and prevent the screw from loosening and falling off due to vibration during operation.

[0053] The third housing 130 can be connected to the first housing 110 and the second housing 120 via screws for easy installation and disassembly. A nozzle connected to the fluid transmission channel 132 is provided on the side of the third housing 130 opposite to the second housing 120. The end of the nozzle opposite to the fluid transmission channel 132 forms an outlet 134. The movable spraying device 200 passes through the fluid transmission channel 132 and the nozzle sequentially, and is movably sealed at the outlet 134. Under the squeezing action of the extruder, the fluid in the reservoir 20 flows into the fluid transmission channel 132 and then into the nozzle. The extruder and the movable spraying device 200 act simultaneously, causing the fluid in the nozzle to be ejected through the outlet 134 with each movement of the movable spraying device 200. During the fluid ejection process, the movable spraying device 200 moves at high speed and simultaneously controls the nozzle to align with the target position, thus connecting the point-like fluid ejected from the outlet 134 into a line to complete the spraying operation at the target position.

[0054] The third housing 130 has a liquid inlet 133 on the side opposite to the first housing 110. The opening of the liquid storage cylinder 20 is located at the liquid inlet 133 and communicates with the fluid transmission channel 132. One end of the valve needle 310 is located in the first housing 110 and connected to the first transmission assembly, while the other end passes through the third housing 130 and is movably disposed in the fluid transmission channel 132. When the movable injection device 200 is raised to allow liquid inflow, the first drive member 320 is activated, driving the first transmission assembly 330 to move the valve needle 310 to the first position, so that the fluid transmission channel 132 is in a conductive state. The fluid in the liquid storage cylinder 20 flows into the fluid transmission channel 132 and smoothly flows into the nozzle along the fluid transmission channel 132. When the active spray device 200 presses down to discharge liquid, the first drive component 320 drives the valve needle 310 to move to the second position through the first transmission component 330, so that the fluid transmission channel 132 is in a blocked state. At this time, the valve needle 310 blocks the fluid transmission channel 132 to prevent the fluid in the nozzle from flowing back. The fluid can only be sprayed out at high speed from the liquid outlet 134 to complete the precise spraying operation.

[0055] In other embodiments, the first shell portion 110 and the second shell portion 120 may also be integrally formed. That is, the first shell portion 110 and the second shell portion 120 are the same shell portion, and the first receiving groove 111 and the second receiving groove 121 are respectively machined on the two opposite sides of the same shell portion.

[0056] In one implementation, please refer to Figure 1 and Figure 3The movable spraying device 200 includes a second drive member 210, a second transmission assembly 220, and a striker assembly 230. The second drive member 210 is connected to the side wall of the second receiving groove 121. The second transmission assembly 220 is movably connected to the side wall of the second receiving groove 121 and abuts against the second drive member 210. The striker assembly 230 abuts between the end of the second transmission assembly 220 away from the second drive member 210 and the side wall of the second receiving groove 121. The end of the striker assembly 230 away from the second transmission assembly 220 passes through the fluid transmission channel 132 and is movably sealed at the liquid outlet 134.

[0057] The second driving member 210 is connected to the side wall of the second receiving groove 121 and is electrically connected to an external control circuit. After connection, the second driving member 210 can generate high-frequency vibration to provide power. The second transmission assembly 220 is movably connected to the side wall of the second receiving groove 121 and abuts against the second driving member 210. During the high-frequency vibration of the second driving member 210, it can drive the second transmission assembly 220 to move. The striking pin assembly 230 abuts between the end of the second transmission assembly 220 away from the second driving member 210 and the side wall of the second receiving groove 121. The end of the striking pin assembly 230 away from the second transmission assembly 220 passes through the fluid transmission channel 132 and the nozzle and seals the outlet 134. The second transmission assembly 220 drives the striking pin assembly 230 to move, thereby movably sealing the outlet 134, thus realizing the opening and closing of the outlet 134.

[0058] The active spraying device 200 also includes a counter, which is electrically connected to an external circuit and located at the end of the second transmission assembly 220 near the second drive member 210, and on the side facing away from the second drive member 210. When the second drive member 210 vibrates at high frequency and drives the impactor assembly 230 through the second transmission assembly 220, each time the second drive member 210 strikes the second transmission assembly 220, it causes the second transmission assembly 220 to strike the contact of the counter once, thus obtaining the movement frequency of the impactor assembly 230. By setting the counter to monitor the movement frequency of the impactor assembly 230 and adjusting the travel speed of the nozzle, the spraying of adhesive to the target position can be achieved, preventing uneven spraying.

[0059] Understandably, after the second driving component 210 is connected to the external circuit, it generates high-frequency vibration, which drives the impact pin assembly 230 to move through the second transmission component 220. Each cycle of the impact pin assembly 230 completes one opening and closing of the liquid outlet 134, and a certain amount of fluid is ejected from the nozzle. By controlling the nozzle to move along the target position, under the high-frequency movement of the impact pin assembly 230, the point-like fluid ejected through the liquid outlet 134 can be connected into a line to complete the spraying operation at the target position.

[0060] In one implementation, please refer to Figure 1 and Figure 2 Both the first shell portion 110 and the second shell portion 120 are provided with heat dissipation components 500, which are located on the outer side wall of the corresponding shell portion.

[0061] Both the first housing 110 and the second housing 120 are provided with heat dissipation components 500. The heat dissipation component 500 on the first housing 110 is connected to the outer wall of the first housing 110, and the heat dissipation component 500 on the second housing 120 is connected to the outer wall of the second housing 120. Taking the heat dissipation component 500 on the second housing 120 as an example, the heat dissipation component 500 includes a heat dissipation body, an input pipe, and an output pipe. The heat dissipation body is connected to the outer wall of the second housing 120 and is close to the movable spraying device 200. A heat dissipation cavity (not shown in the figure) for the flow of cryogenic liquid or cryogenic gas is formed inside the heat dissipation body, and both the input pipe and the output pipe are connected to the heat dissipation body. During the spraying operation, due to the high-speed movement of the movable spraying device 200, a large amount of heat is generated by friction, and the heat is conducted to the heat dissipation body through the second housing 120. Cryogenic liquid or gas is injected into the heat dissipation cavity of the heat sink through the inlet pipe. During its flow within the cavity, the liquid or gas exchanges heat with the heat sink. The liquid or gas, having completed the heat exchange, exits the cavity through the outlet pipe, carrying away heat and thus cooling the second housing 120. This prevents the movable spray device 200 from overheating during spraying, which could affect its performance. Similarly, the high-speed movement of the check valve assembly 300 generates significant heat through friction. This heat is conducted through the first housing 110 to the heat sink 500, cooling the first housing 110 and preventing the check valve assembly 300 from overheating during the movement of the valve needle 310, which could also affect its performance.

[0062] In other embodiments, the first housing portion 110 and the second housing portion 120 may also share a heat sink 500. A third receiving groove is formed on the opposite side of the first housing portion 110 and the second housing portion 120, and the heat sink 500 is disposed in the third receiving groove and connected to the outer side wall of the first housing portion 110 and the second housing portion 120.

[0063] This utility model also proposes a glue spraying device, which includes a piezoelectric jet valve. The specific structure of the piezoelectric jet valve is as described in the above embodiments. Since the glue spraying device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0064] The above description is merely an exemplary embodiment of the present utility model and does not limit the scope of protection of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present utility model.

Claims

1. A piezoelectric injection valve for mounting a liquid storage tank and injecting fluid from the liquid storage tank, characterized in that, The piezoelectric injection valve includes: The valve body has a fixing member on its outer wall for fixing the liquid storage cylinder. The valve body forms a fluid transmission channel and an inlet and an outlet that communicate with the fluid transmission channel. The inlet is used to communicate with the liquid storage cylinder. A movable spraying device is disposed on the valve body, and the movable spraying device is movably sealed to the liquid outlet; and A check valve assembly is disposed in the valve body, and the check valve assembly is used to block or open the fluid transmission channel.

2. The piezoelectric injection valve as described in claim 1, characterized in that, The fluid transmission channel has an opening, and the check valve assembly includes a valve needle that is movably disposed along its axial direction through the opening, such that the valve needle has a first position for opening the fluid transmission channel and a second position for blocking the fluid transmission channel.

3. The piezoelectric injection valve as described in claim 2, characterized in that, The fluid transmission channel includes two spaced-apart transmission sections, with the gap between the two transmission sections forming the through port. The valve needle forms a liquid passage. At the first position, the liquid passage is connected to both transmission sections. At the second position, the ports of the two transmission sections at their closest ends are positioned opposite to the outer peripheral wall of the valve needle.

4. The piezoelectric injection valve as described in claim 3, characterized in that, There is a gap between the ports of the two transmission segments at their closest points to each other and the valve needle; And / or, the two transmission segments are configured to connect a first transmission segment to the inlet and a second transmission segment to the outlet, wherein the length of the second transmission segment is less than or equal to the length of the first transmission segment.

5. The piezoelectric injection valve as described in claim 2, characterized in that, The valve body has a receiving cavity, and the fluid transmission channel is formed in the receiving cavity. The valve needle passes through the receiving cavity. The piezoelectric injection valve also includes a sealing element disposed in the receiving cavity. The sealing element is connected to the inner wall surface of the receiving cavity and is sleeved on the outer side of the valve needle. The inner peripheral wall of the sealing element has a lip that abuts against the valve needle.

6. The piezoelectric injection valve as described in claim 2, characterized in that, The check valve assembly further includes a first drive member and a first transmission assembly disposed on the valve body. The first drive member is driven to connect to the first transmission assembly, and the first transmission assembly is movably connected to the valve needle so that the valve needle can move along its axial direction.

7. The piezoelectric injection valve as described in claim 6, characterized in that, The valve body includes a first housing, a second housing, and a third housing connected to each other. The first housing and the second housing are arranged opposite to each other. The fixing member is connected to the outer side wall of the first housing and the second housing. A first receiving groove is formed on the side of the first housing away from the second housing, and the first driving member and the first transmission assembly are located in the first receiving groove. A second receiving groove is formed on the side of the second housing away from the first housing, and the movable injection device is located in the second receiving groove. The fluid transmission channel is formed inside the third shell. The first shell and the second shell are located on the same side of the third shell. The liquid outlet is formed on the side of the third shell away from the second shell, and the liquid inlet is formed on the side of the first shell away from the second shell. The valve needle passes through the third shell and is movably connected to the first shell.

8. The piezoelectric injection valve as described in claim 7, characterized in that, The movable spraying device includes a second driving member, a second transmission assembly, and a striking pin assembly. The second driving member is connected to the side wall of the second receiving groove. The second transmission assembly is movably connected to the side wall of the second receiving groove and abuts against the second driving member. The striking pin assembly abuts between the end of the second transmission assembly opposite to the second driving member and the side wall of the second receiving groove. The end of the striking pin assembly opposite to the second transmission assembly passes through the fluid transmission channel and movably seals the liquid outlet.

9. The piezoelectric injection valve as described in claim 7, characterized in that, Both the first shell portion and the second shell portion are provided with heat dissipation components, which are located on the outer side wall of the corresponding shell portion.

10. A glue spraying device, characterized in that, Includes the piezoelectric injection valve as described in any one of claims 1 to 9.

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