Piezoelectric stacking lever type valve

Abstract

The invention discloses a piezoelectric stacking lever type valve which comprises a valve body, the valve body is provided with an air inlet, an air outlet and a valve cavity, and the valve cavity communicates with the air inlet and the air outlet; the control assembly comprises a control rod, the control rod is installed in the valve cavity in the second direction, and one side of the control rod can adjust the air inlet facing the valve body; the driving assembly comprises a piezoelectric driving part and a pre-pressing piece, the pre-pressing piece elastically extends from the piezoelectric driving part to the other side of the control rod, so that the pre-pressing piece elastically abuts against the other side of the control rod in the first direction, and when the driving assembly is powered on, the piezoelectric driving part drives the pre-pressing piece and the control rod to move in the first direction, so that the air inlet amount of the air inlet is adjusted; therefore, fine adjustment of the position of the control rod is achieved through accurate displacement control of the piezoelectric driving part, the valve can control the opening degree of the air inlet very accurately, and then high-precision adjustment of the air inlet amount is achieved.

Description

Technical Field

[0001] This application relates to the technical field of lever valves, and more particularly, to a piezoelectric stack lever valve. Background Art

[0002] A control valve for fluids is a device used to control the flow and flow rate of fluids and is widely used in industrial fields. Its working environment is diverse, with temperature ranges from cryogenic to high temperature, pressure ranges from low pressure to high pressure, and it can handle various fluids such as air, water, steam, and corrosive media, and can operate in complex environments such as humid, corrosive gas, or dust; in terms of internal structure, a fluid control valve usually includes key components such as a valve body, a valve core and a valve seat, an actuator, a positioner, and a sealing component, where the valve core and the valve seat cooperate to control the fluid flow rate, the actuator provides driving force, the positioner ensures precise control, and the sealing component prevents medium leakage; in terms of working voltage, different types of control valves vary: the working voltage of a control valve is generally 24V DC, such as solenoid valves and electric ball valves, but common control valves have low precision and are difficult to be used in applications with micro flow control.

[0003] The piezoelectric drive method is a drive method that converts electrical energy into mechanical energy using the inverse piezoelectric effect of piezoelectric materials and is widely used in the processing fields of precision instruments, such as in lithography machines, dispensing machines, or piezoelectric drive motors. The control precision of piezoelectric drive is relatively high and can meet the requirements of precise control. However, due to its high cost, it will increase the manufacturing cost of the equipment, and its working voltage is also relatively high, generally 220V or 360V, resulting in certain safety hazards during the application process and restricting its application in more scenarios. Summary of the Invention

[0004] An object of this application is to provide a piezoelectric stack lever valve. A piezoelectric drive part is arranged on one side of the control rod, so that after the valve is powered on, through the piezoelectric actuation of the piezoelectric drive part, the control rod is driven to move along the first direction, thereby achieving the purpose of adjusting the air intake of the valve to realize precise adjustment of the air intake.

[0005] To achieve the above object, the technical solution adopted in this application is as follows: A piezoelectric stack lever valve, characterized by comprising: a valve body, the valve body is provided with an air inlet, an air outlet and a valve cavity, and the valve cavity communicates with the air inlet and the air outlet; a control assembly, the control assembly includes a control rod, the control rod is installed in the valve cavity along a second direction, and one side of the control rod faces the air inlet of the valve body adjustably; a driving assembly, the driving assembly includes a piezoelectric driving part and a preloading member, the preloading member elastically extends from the piezoelectric driving part to the other side of the control rod, so that the preloading member and the other side of the control rod are elastically abutted along a first direction, and when powered on, the piezoelectric driving part drives the preloading member and the control rod to move along the first direction, so as to adjust the air intake of the air inlet.

[0006] As a preference, the valve body further includes a first valve part and a second valve part, the air inlet and the air outlet are spacedly arranged on the first valve part, the driving assembly is adjustably installed on the second valve part, and the control rod is installed on the first valve part and the second valve part in a tiltable driving manner.

[0007] As another preference, the control rod is provided with a first rod body, a second rod body and a fulcrum part, the first rod body is located on one side of the control rod and faces the air inlet of the first valve part, the second rod body is located on the other side of the control rod and abuts against the preloading member in the second valve part, the fulcrum part is connected to the inner wall of the valve body, and the distance between the fulcrum part and the preloading member along the second direction is less than the distance between the fulcrum part and the air inlet along the second direction.

[0008] Further preferably, the valve body further includes an elastic member, the elastic member is deformably installed between the first rod body and the inner wall of the first valve part, the elastic member and the air inlet are arranged opposite to each other along the first direction, the elastic member provides a supporting force for the free section of the first rod body, and at the same time, the preloading member provides a preloading force for the contact section of the second rod body. When the piezoelectric driving part drives the preloading member to move upward so that the preloading force is greater than the supporting force, the free section of the first rod body deviates from the air inlet. When the piezoelectric driving part drives the preloading member to move downward so that the preloading force is less than the supporting force, the free section of the first rod body approaches the air inlet.

[0009] Further preferably, the first valve portion is provided with a first cavity and a sealing groove, the second valve portion is provided with a second cavity, the first cavity and the second cavity form the valve cavity, the first cavity communicates with the air inlet and the air outlet, the sealing groove is disposed between the first cavity and the second cavity, the control assembly is provided with a sealing member, and the sealing member extends from the first rod body along a first direction towards the sealing groove, so as to cut off the gas flow between the first cavity and the second cavity.

[0010] Further preferably, the driving assembly further includes a positioning member and a base, the positioning member is provided with a positioning hole, the piezoelectric driving portion is piezoelectrically actuatedly installed in the base along the first direction, the positioning member is fixed above the base, and the preloading member is deformably passed through the positioning hole and abuts against the contact section of the second rod body.

[0011] Further preferably, the preloading member is provided with a deformation cavity, a preloading section, a pair of elastic inclined sections and a pair of limiting sections, the elastic inclined sections are integrally and obliquely connected to the preloading section and the limiting sections, the preloading section is arc-connected to the top ends of the elastic inclined sections, the deformation cavity is formed between the elastic inclined sections and the preloading section, the limiting sections bend and extend outwards from the bottom ends of the elastic inclined sections, and the elastic inclined sections are elastically connected to both sides of the opening of the positioning hole, so that the preloading member can be adaptively deformed and clamped in the positioning hole.

[0012] Further preferably, the shape of the preloading member is generally in a V structure, the preloading section is disposed between the pair of elastic inclined sections, the elastic inclined sections include a first elastic inclined section and a second elastic inclined section, one end of the preloading section is connected to the first elastic inclined section, the other end of the preloading section is connected to the second elastic inclined section, and the first elastic inclined section and the second elastic inclined section are oppositely arranged along the second direction. When the piezoelectric driving portion is powered on, the piezoelectric driving portion generates an upward first driving force, the first driving force pushes the preloading member to move upwards, the elastic inclined sections approach each other to generate an upward second driving force, and the resultant force of the first driving force and the second driving force drives the control rod to tilt and move.

[0013] Further preferably, the base is provided with a receiving cavity, the piezoelectric driving portion is disposed in the receiving cavity, the piezoelectric driving portion includes a plurality of piezoelectric sheets, and the piezoelectric sheets are stacked along the first direction.

[0014] Further preferably, the fulcrum portion is disposed between the first rod body and the second rod body; or the fulcrum portion is disposed at an end of the second rod body away from the first rod body; wherein, the piezoelectric sheet includes a ceramic sheet and a metal sheet, the ceramic sheet and the metal sheet are alternately stacked along the first direction, a tab is provided on the peripheral side of the metal sheet, and the tab protrudes along the extension direction of the metal plate and bends along the first direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of a valve according to some embodiments of the present application;

[0016] Figure 2 is a top view of a valve according to some embodiments of the present application;

[0017] Figure 3 is Figure 2 a cross-sectional view taken along the A-A direction in

[0018] Figure 4 is Figure 3 an enlarged view of region B in

[0019] Figure 5 is a schematic partial structural diagram according to some embodiments of the present application;

[0020] Figure 6 is Figure 5 a cross-sectional view taken along the C-C direction in

[0021] Figure 7 is a schematic structural diagram of a control component;

[0022] Figure 8 is a schematic structural diagram of a second valve portion;

[0023] Figure 9 is Figure 8 a cross-sectional view taken along the D-D direction in

[0024] Figure 10 is a schematic structural diagram of the preloading member and the positioning member cooperating with each other;

[0025] Figure 11 is a schematic structural diagram of a valve according to some other embodiments of the present application;

[0026] Figure 12 is a schematic structural diagram of a piezoelectric driving portion.

[0027] In the figure: 10, valve body; 101, air inlet; 102, air outlet; 11, first valve part; 111, first cavity; 112, elastic member; 113, sealing groove; 12, second valve part; 121, second cavity; 20, control assembly; 21, control rod; 211, first rod body; 212, second rod body; 213, fulcrum part; 214, free section; 215, contact section; 22, seal; 30, drive assembly; 31, piezoelectric drive part; 311, metal sheet; 3111, tab; 32, preloading member; 321, deformation cavity; 322, preloading section; 323, first elastic inclined section; 324, second elastic inclined section; 325, limiting section; 33, positioning member; 331, positioning hole; 332, mounting hole; 34, base; 341, accommodating cavity; 343, first locking part; 344, second locking part. Detailed implementation manners

[0028] Next, with reference to the detailed implementation manners, the present application will be further described. It should be noted that, on the premise of no conflict, the following-described embodiments or technical features can be arbitrarily combined to form new embodiments.

[0029] In the description of the present application, it should be noted that for orientation terms, such as terms "center", "transverse", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the orientation and position relationships indicated are based on the orientation or position relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as limiting the specific protection scope of the present application.

[0030] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence.

[0031] The terms "comprising" and "having" and any variations thereof in the description and claims of the present application are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0032] The present application provides a piezoelectric stack lever type valve. The valve provided by the present application is as Figure 1 shown, and the internal structure of the valve is as Figure 3 shown, where Figure 3 isFigure 2 Cross-sectional view along the A-A direction; including: valve body 10, the valve body 10 is provided with an air inlet 101, an air outlet 102 and a valve cavity, and the valve cavity communicates with the air inlet 101 and the air outlet 102; a control assembly 20, the control assembly 20 includes a control rod 21, the control rod 21 is installed in the valve cavity along the second direction, and one side of the control rod 21 faces the air inlet 101 of the valve body 10 adjustably; a driving assembly 30, the driving assembly 30 includes a piezoelectric driving part 31 and a preloading member 32, the preloading member 32 elastically extends from the piezoelectric driving part 31 to the other side of the control rod 21, so that the preloading member 32 elastically abuts against the other side of the control rod 21 along the first direction. When energized, the piezoelectric driving part 31 drives the preloading member 32 and the control rod 21 to move along the first direction, so as to adjust the air intake of the air inlet 101. Thus, by arranging the piezoelectric driving part 31 on one side of the control rod 21, after the valve is energized, through the piezoelectric actuation of the piezoelectric driving part 31, the control rod 21 is driven to move along the first direction, so as to achieve the purpose of adjusting the air intake of the valve and realize precise air intake adjustment. It can be understood that when the valve is closed, one side of the control rod 21 abuts against the air inlet 101 for sealing to prevent gas leakage. When the piezoelectric driving part 31 piezoelectrically actuates the other side of the control rod 21 along the first direction, the distance between the control rod 21 and the air inlet 101 increases, and the valve opens.

[0033] Among them, the piezoelectric driving part 31 can realize precise adjustment of the air intake of the air inlet 101 through precisely controllable piezoelectric actuation. The piezoelectric driving part 31 is made of stacked piezoelectric sheets and can realize very precise displacement control. Thus, by adjusting the position of the control rod 21 moving along the first direction, the air intake can be precisely controlled. The response time of the piezoelectric driving part 31 is very short, and it can complete the process from energization to driving the control rod 21 to move in a short time, which is suitable for application scenarios that require rapid response and avoids the hysteresis of the valve; at the same time, the piezoelectric driving part 31 only needs a voltage of ±24V to drive and does not require too high a voltage for driving. A large force output is achieved through the lever structure of the control rod 21. Therefore, the energy consumption during operation is lower and the safety is higher.

[0034] Moreover, the gas consumption of the valve provided by the present application is also lower. When the valve is in a relatively stable regulation position, the air inlet 101 is closed and the air outlet 102 is also closed, so that the gas volume in the valve body 10 is static for a period of time and there is no air consumption; compared with traditional valves, when reaching a certain stable value, the air inlet always has air supply and the exhaust port always has air discharge, and the air supply volume is equal to the exhaust volume. It can be seen from this that the gas consumption of the valve provided by the present application is lower.

[0035] In some embodiments, the air inlet 101 and the air outlet 102 are provided on opposite sides of the valve body 10 in a staggered manner. The air inlet 101 and the air outlet 102 communicate with each other through the valve cavity, so that gas flows into the valve cavity from the air inlet 101 and then flows out of the valve cavity through the air outlet 102, as Figure 3 shown.

[0036] In some embodiments, the air inlet 101 and the air outlet 102 are provided on one side of the valve body 10 at intervals. The air inlet 101 and the air outlet 102 communicate with each other through the valve cavity, so that gas flows into the valve cavity from the air inlet 101 and then flows out of the valve cavity through the air outlet 102, as Figure 11 shown.

[0037] In some embodiments, the first direction is not only the height direction of the valve body 10, i.e., the direction of the Z-axis, but also includes directions close to being parallel to the Z-axis. The second direction is not only the length direction of the valve body 10, i.e., the X-axis direction, but also includes directions close to being parallel to the X-axis. The Y-axis direction is the width direction of the valve body 10.

[0038] In some embodiments, as Figure 3 shown, the valve body 10 further includes a first valve portion 11 and a second valve portion 12. The air inlet 101 and the air outlet 102 are provided on the first valve portion 11 at intervals. The driving assembly 30 is adjustably installed on the second valve portion 12. The air inlet 101 and the air outlet 102 are provided on the first valve portion 11 at intervals, and the driving assembly 30 is installed on the second valve portion. Moreover, by reasonably setting the air inlet 101 and the air outlet 102, the positions of the air inlet 101 and the air outlet 102 can be flexibly set on the same side or different sides of the valve body 10 to adapt to the laying requirements of different external pipelines; the control rod 21 is installed on the first valve portion 11 and the second valve portion 12 in a tiltable driving manner. The control rod 21 penetrates through the first valve portion 11 and the second valve portion 12. The tiltable driving control rod 21 can be dynamically adjusted according to real-time requirements, so that the valve can quickly respond to changes in the system and maintain stable flow control.

[0039] In some embodiments, the control rod 21 is provided with a first rod body 211, a second rod body 212 and a fulcrum portion 213. The first rod body 211 is located on one side of the control rod 21 and faces the air inlet 101 of the first valve portion 11. The second rod body 212 is located on the other side of the control rod 21 and abuts against the preloading member 32 in the second valve portion 12. The fulcrum portion 213 is connected to the inner wall of the valve body 10. The distance between the fulcrum portion 213 and the preloading member 32 in the second direction is smaller than the distance between the fulcrum portion 213 and the air inlet 101 in the second direction. By designing the fulcrum portion 213, the first rod body 211 and the second rod body 212 of the control rod 21, a lever system is formed. The distance between the fulcrum portion 213 and the preloading member 32 in the second direction is smaller than the distance between the fulcrum portion 213 and the air inlet 101 in the second direction. That is to say, the distance from the second rod body 212 to the fulcrum portion 213 is shorter, while the distance from the first rod body 211 to the fulcrum portion 213 is longer. According to the lever principle, such a setting can amplify the driving force transmitted by the preloading member 32, so that a smaller driving force can achieve a larger control force, and thus the opening and closing of the air inlet 101 can be adjusted more easily. The piezoelectric driving portion 31 precisely controls the displacement amount through voltage change. The application of the lever principle not only amplifies the driving force, but also makes the movement of the control rod 21 more precise. A smaller input displacement can be converted into a larger output displacement. Therefore, the piezoelectric driving portion 31 only needs to provide a smaller driving force and displacement amount to achieve fine adjustment of the air intake volume.

[0040] In some embodiments, the piezoelectric wafers are stacked on top of each other, and the internal electrodes of the piezoelectric wafers are connected in parallel. When the size of the piezoelectric wafer is 8 mm * 8 mm and the thickness is 0.08 mm, the output force of the piezoelectric wafer is 6 N. After each piezoelectric wafer is energized and deforms, a displacement amount of 1 μm can be generated. Then, if 40 layers of piezoelectric wafers are connected in parallel, an output force of 240 N and a displacement amount of 40 μm can be obtained. If it is calculated according to the requirement of 98 N of driving force per square centimeter, assuming that the diameter of the air inlet 101 is 0.7 cm and the radius is 0.35 cm, the area of the air inlet 101 is 0.385 cm 2 , then the driving force required for the opening and closing of the air inlet 101 is 37.73 N, and the displacement amount required for the opening and closing of the valve is 0.2 mm.

[0041] In some embodiments, if it is necessary to further adjust the opening and closing degree of the air inlet 101, the opening and closing degree of the air inlet 101 can be adjusted by adjusting the stacking layer number of the piezoelectric wafers, the voltage applied to the piezoelectric wafers, the overlapping surface area between the piezoelectric wafers, and the thickness of the piezoelectric wafers.

[0042] In some embodiments, each part of the control rod 21 is arranged inside the valve body 10, making the structure of the entire valve more compact. The first rod body 211 faces the air inlet 101, the second rod body 212 abuts against the preloading member 32, the fulcrum portion 213 is connected to the inner wall of the valve body 10, and the control rod 21 rotates around the fulcrum portion 213, so that the free section 214 of the first rod body 211 abuts against or moves away from the air inlet 101. The fulcrum portion 213 can be arranged between the free section 214 and the contact section 215 of the control rod 21. For example, the free section 214 and the fulcrum portion 213 are respectively located at both ends of the first rod body 211, and the contact section 215 is located on the second rod body 212, as Figure 3 shown; alternatively, the fulcrum portion 213 can also be arranged at the outer end of the second rod body 212, and the contact section 215 is located between the free section 214 and the fulcrum portion 213 of the control rod 21. For example, the free section 214 is located at one end of the first rod body 211, and the contact section 215 and the fulcrum portion 213 are located on the second rod body 212. Thus, by flexibly setting the position of the fulcrum portion 213, the piezoelectric driving portion 31 can drive the control rod 21 in the first direction, making the valve body 10 highly adaptable and having a wider application range.

[0043] In other words, different fulcrum positions can adapt to different mechanical requirements and motion modes. For example, when the fulcrum portion 213 is arranged between the first rod body 211 and the second rod body 212, that is, the valve shown in Fig. 3, it is more suitable for scenarios that require balanced or symmetric motion; while when the fulcrum portion 213 is arranged at the end of the second rod body 212 far from the first rod body 211, that is, the valve shown in Figure 11 shown, it is more suitable for scenarios that require lever effect or one-way motion.

[0044] In some embodiments, the valve body 10 further includes an elastic member 112. The elastic member 112 is deformably mounted between the first rod body 211 and the inner wall of the first valve portion 11. The elastic member 112 can be in flexible contact with the first rod body 211 and the inner wall, reducing the hard friction between mechanical components, lowering the wear rate, and thus extending the service life of the valve. Moreover, the elastic deformation of the elastic member 112 can automatically compensate for the minute displacement changes caused by factors such as temperature variations and mechanical deformations, ensuring the sealing performance and control accuracy of the valve. The elastic member 112 and the air inlet 101 are oppositely arranged in the first direction. The elastic member 112 provides a supporting force to the free section 214 of the first rod body 211. At the same time, the preloading member 32 provides a preloading force to the contact section 215 of the second rod body 212. When the piezoelectric driving portion 31 drives the preloading member 32 to move upward so that the preloading force is greater than the supporting force, the free section 214 of the first rod body 211 deviates from the air inlet 101. When the piezoelectric driving portion 31 drives the preloading member 32 to move downward so that the preloading force is less than the supporting force, the free section 214 of the first rod body 211 approaches the air inlet 101. The elastic member 112 provides the supporting force and the preloading member 32 provides the preloading force. By means of the minute displacement of the piezoelectric driving portion 31, the dynamic balance between the preloading force and the supporting force can be achieved, thereby precisely controlling the distance between the free section 214 and the air inlet 101 and realizing the fine adjustment of the air intake volume.

[0045] In some embodiments, as Figure 4 shown, the first valve portion 11 is provided with a first cavity 111 and a sealing groove 113; as Figure 3 shown, the second valve portion 12 is provided with a second cavity 121; the first cavity 111 and the second cavity 121 form a valve cavity. The first cavity 111 communicates with the air inlet 101 and the air outlet 102. The sealing groove 113 is arranged between the first cavity 111 and the second cavity 121. As Figure 7 shown, the control assembly 20 is provided with a sealing member 22. The sealing member 22 extends from the first rod body 211 in the first direction towards the sealing groove 113, thereby blocking the gas flow between the first cavity 111 and the second cavity 121. By providing the sealing groove 113 between the first valve portion 11 and the second valve portion 12 and arranging the sealing member 22 on the control assembly 20, with the sealing member 22 extending from the first rod body 211 to the sealing groove 113, the gas flow between the first cavity 111 and the second cavity 121 can be effectively blocked, ensuring the sealing performance of the valve in the closed state. The flexible contact between the sealing member 22 and the sealing groove 113 reduces the hard friction between mechanical components, lowers the wear rate, and thus extends the service life of the valve.

[0046] In some embodiments, a seal 22 is provided between the control rod 21 and the air inlet 101, and the two are abutted against each other through the seal 22 to achieve opening and closing by abutting against each other or moving away from each other. Compared with a ball valve, a sphere is provided inside the ball valve, and a channel is provided on the sphere. When the ball valve is opened, the sphere needs to overcome the friction with the air inlet and rotate to open the ball valve. This results in the deterioration of the sealing performance of the ball valve due to severe wear of the sphere during long-term use. Therefore, for the valve provided in this application, a seal 22 is provided between the control rod 21 and the air inlet 101. On the one hand, the sealing performance of the air inlet 101 is increased, and on the other hand, the wear between the control rod 21 and the air inlet 101 is reduced to increase the service life of the valve, so that the valve still maintains a good sealing effect during long-term use.

[0047] In some embodiments, as Figure 6 shown, the drive assembly 30 further includes a positioning member 33 and a base 34; as Figure 11 shown, the positioning member 33 is provided with a positioning hole 331, at least a part of the preloading member 32 passes through the positioning hole 331, the positioning member 33 is fixed above the base 34, and the preloading member 32 deformably passes through the positioning hole 331 and abuts against the contact section 215 of the second rod body 212 to precisely control the position of the preloading member 32, ensure that its contact section 215 with the second rod body 212 can be accurately aligned and abutted, and effectively reduce the error during the assembly process, improve the accuracy and reliability of the valve body 10. The preloading member 32 deformably passes through the positioning hole 331, which can buffer external forces to a certain extent and reduce the impact on the piezoelectric drive portion 31 and the second rod body 212, thereby improving the stability of the valve body 10. As Figure 6 and Figure 9 shown, wherein Figure 9 is Figure 8 a cross-sectional view taken along the D-D direction in

[0048] In some embodiments, as Figure 10As shown, the preloading member 32 is provided with a deformation cavity 321, a preloading section 322, a pair of elastic inclined sections, and a pair of limiting sections. The elastic inclined sections are integrally and obliquely connected to the preloading section 322 and the limiting sections 325. The preloading section 322 is arc-connected to the top ends of the elastic inclined sections. The deformation cavity 321 is formed between the elastic inclined sections and the preloading section 322. When the preloading member 32 is subjected to an external force, the deformation cavity 321 can provide additional buffer space, enabling the preloading member 32 to better adapt to different working conditions. The limiting sections 325 extend outward and bend from the bottom ends of the elastic inclined sections, enhancing the stability of the preloading member 32. The limiting sections 325 can prevent the preloading member 32 from excessive deformation or displacement, ensuring its reliability during operation. The elastic inclined sections are elastically connected to both sides of the opening of the positioning hole 331, enabling the preloading member 32 to be adaptively deformed and clamped in the positioning hole 331. The preloading member 32 can be stably clamped in the positioning hole 331. Even under vibration or external force, the preloading member 32 is not easily loosened or detached.

[0049] In some embodiments, the deformation cavity 321, the preloading section 322, the elastic inclined sections, and the limiting sections 325 of the preloading member 32 adopt an integrated design, reducing the number of components and assembly steps, making the assembly process simpler and faster, and improving production efficiency.

[0050] In some embodiments, as Figure 10 shown, the shape of the preloading member 32 is generally in a V structure. The structural design of the preloading member 32 makes the internal structure of the valve body 10 more compact, reducing the space occupied by each component. The preloading section 322 is disposed between a pair of elastic inclined sections. The elastic inclined sections include a first elastic inclined section 323 and a second elastic inclined section 324. One end of the preloading section 322 is connected to the first elastic inclined section 323, and the other end of the preloading section 322 is connected to the second elastic inclined section 324. And the first elastic inclined section 323 and the second elastic inclined section 324 are oppositely arranged along the second direction. The elastic deformation of the elastic inclined sections can reduce the impact and wear on the preloading member 32 during operation, thereby extending the service life of the preloading member 32. When the piezoelectric driving portion 31 is powered on, the piezoelectric driving portion 31 generates an upward first driving force. The first driving force pushes the preloading member 32 to move upward. The elastic inclined sections approach each other to generate an upward second driving force. The second driving force generated by the mutual approach of the two elastic inclined sections can further amplify the driving force of the piezoelectric driving portion 31, so as to achieve a greater preloading force output with a smaller input power. The preloading force synthesized by the first driving force and the second driving force is greater than the supporting force of the elastic member 112, making the output of the preloading force more efficient.

[0051] In some embodiments, as Figure 3As shown, the base 34 is provided with a receiving cavity 341, and the piezoelectric driving part 31 is arranged in the receiving cavity 341. Installing the piezoelectric driving part 31 in the receiving cavity 341 of the base 34 makes the internal structure of the valve body 10 more compact. It reduces the volume and occupied space of the valve body 10 and is suitable for applications in space-constrained scenarios; the piezoelectric driving part 31 includes a plurality of piezoelectric sheets, and the piezoelectric sheets are stacked along the first direction. By stacking, the total displacement and driving force output of the piezoelectric driving part 31 can be significantly increased. The plurality of piezoelectric sheets work together to generate greater force and displacement, thereby improving the overall performance of the valve body 10. Moreover, by increasing or decreasing the number of piezoelectric sheets, the driving force and displacement range of the piezoelectric driving part 31 can be flexibly adjusted to meet different application requirements; the piezoelectric driving part 31 can convert electrical energy into mechanical energy more efficiently. By reasonably designing the number and stacking method of the piezoelectric sheets, the energy conversion efficiency can be improved and energy loss can be reduced.

[0052] In some embodiments, the base 34 is further provided with a first locking part 343 and a second locking part 344. The base 34 is threadedly connected to the first valve part 11 through the first locking part 343, and the base 34 is threadedly connected to the second valve body 12 through the second locking part 344, ensuring that the valve body 10 will not loosen or shift during operation, guaranteeing the sealing and stability of the valve; moreover, the detachable connection method facilitates the maintenance, replacement or repair of the valve body 10. When the valve body 10 needs to be operated, it can be easily disassembled by unlocking, improving the maintainability of the equipment. When the intake air volume of the valve needs to be adjusted significantly, the base 34 can be disassembled, and the piezoelectric driving part 31 and the base 34 as a whole can be replaced, and the piezoelectric driving part 31 with different numbers of layers, different surface areas or different thicknesses can be replaced, so as to achieve the purpose of significantly adjusting the intake air volume.

[0053] In some embodiments, as Figure 10 shown, the positioning member 33 is further provided with mounting holes 332, and the mounting holes 332 are arranged in pairs, enabling the positioning member 33 to be detachably mounted on the base 34. As Figure 9 shown, the base 34 is provided with threaded holes adapted to the mounting holes 332, and the threaded holes coincide with the mounting holes 332, so that screws pass through the mounting holes 332 and engage with the threads in the threaded holes, so that the positioning member 33 is fixed on the top of the base 34.

[0054] In some embodiments, as Figure 6 shown, the fulcrum part 213 is arranged between the first rod body 211 and the second rod body 212. When the piezoelectric driving part 31 is powered on, the piezoelectric sheets are bent and deformed, causing the piezoelectric driving part 31 to generate a displacement in the vertical direction, thereby pushing the preloading member 32 to elastically abut against the contact section 215. The second rod body 212 moves upward, and the first rod body 211 moves downward. As Figure 3As shown, when the first rod body 211 moves downward, the air inlet 101 is opened; when the piezoelectric drive part 31 is powered off, the piezoelectric sheet resumes its shape, the piezoelectric drive part 31 resets, the pre-pressing part 32 moves away from the contact section 215, the second rod body 212 moves downward, the first rod body 211 moves upward, and the elastic member 112 pushes the first rod body 211 upward to seal the air inlet 101.

[0055] In actual application scenarios, the price of the piezoelectric drive part 31 is relatively high, mainly because the assembly process of the piezoelectric drive part 31 is difficult and the cost is high. As a result, in many application scenarios, only solenoid valves with lower costs can be selected for control. However, the control accuracy of solenoid valves is not high, the contact surface is prone to wear, and effective control of micro-flows cannot be achieved, resulting in the application effect of solenoid valves failing to meet expectations.

[0056] In addition, after assembly, electrodes need to be dot-mounted on the piezoelectric sheet. If the piezoelectric drive part 31 is tilted, electrode adhesion will occur during dot-mounting of the electrodes, resulting in a short circuit when the piezoelectric drive part 31 is powered on. Therefore, the structure of the piezoelectric sheet in this application is improved. Most piezoelectric sheets are made of metal or ceramic. Here, the metal sheet 311 is used as an example, as Figure 12 shown, ear tabs 3111 are provided on the periphery of the metal sheet 311. The number of ear tabs 3111 is set according to actual usage and is not limited here; after the ear tabs 3111 are provided, manual electrode dot-mounting is not required, reducing the processing steps. At the same time, there are gaps between the ear tabs 3111, which can prevent the piezoelectric drive part 31 from short-circuiting.

[0057] Specifically, a piezoelectric drive part 31 is provided inside the valve, and the piezoelectric sheets are stacked vertically. It is required that the piezoelectric drive part 31 forms a straight line in the vertical direction, that is, the centers of the piezoelectric sheets are on the same straight line, and this straight line is perpendicular to the horizontal line. Moreover, when the piezoelectric drive part 31 is in direct contact with the control rod 21, this requires a high level of flatness for the end face of the piezoelectric drive part 31. If the flatness of the piezoelectric drive part 31 cannot meet the requirements, there will be a situation where it cannot effectively contact the control rod 21; and during the assembly process, the piezoelectric drive part 31 will have uncontrollable tilting, and the direction and degree of tilting cannot be effectively controlled, resulting in a high assembly difficulty. The tilted piezoelectric drive part 31 cannot be used continuously, resulting in a low yield rate. Therefore, the cost of piezoelectric valves remains high, and piezoelectric drive is only used for control in some special fields, such as glue dispensers and camera modules with piezoelectric motors, resulting in limited application scenarios for piezoelectric valves.

[0058] Therefore, based on the above analysis, the present application provides a valve that can not only meet the requirements of micro-flow control but also has a low price. To reduce the requirements of the valve for flatness, a preloading member 32 is provided between the piezoelectric driving portion 31 and the control rod 21. To prevent the preloading member 32 from shifting during the operation of the valve body 10, a positioning member 33 is provided to limit the movement of the preloading member 32. The driving force is transmitted between the piezoelectric driving portion 31 and the control rod 21 through the preloading member 32. Compared with the structure where the piezoelectric driving portion 31 and the control rod 21 are in direct surface-to-surface contact, the provision of the deformable preloading member 32 can effectively reduce the requirements of the valve body 10 for the flatness of the contact surface of the piezoelectric driving portion 31. In case the piezoelectric driving portion 31 stacks to form an inclined surface, the upper surface of the piezoelectric driving portion 31 cannot contact the control rod 21. This not only ensures that the piezoelectric driving portion 31 can effectively drive the control rod 21 to move but also greatly reduces the assembly process difficulty. When the piezoelectric driving portion 31 is inclined during the assembly process, it can also be installed into the accommodating cavity 341, greatly improving the assembly fault tolerance rate. After the manufacturing cost is reduced, the valve provided by the present application can be used in more usage scenarios.

[0059] For example, as Figure 3 shown, assuming that the piezoelectric driving portion 31 is inclined. If the preloading member 32 is not provided, after the piezoelectric driving portion 31 is powered on, it will generate a displacement amount along the inclined direction of the piezoelectric driving portion 31, and the upper surface of the piezoelectric driving portion 31 cannot effectively contact the control rod 21, that is, surface-to-surface contact, resulting in inaccurate adjustment during the process of controlling the opening and closing of the valve or adjusting the intake air volume. If the preloading member 32 is provided, the piezoelectric driving portion 31 will generate a displacement amount along the inclined direction. Although there is an angle in the horizontal direction on the upper surface of the piezoelectric driving portion 31 and the preloading member 32 will be inclined, however, even if the preloading member 32 is inclined, there is always a part of the preloading section 322 of the preloading member 32 that is in contact with the control rod 21. As the piezoelectric driving portion 31 generates a displacement amount, it will push the preloading section 322 to abut against the control rod 21 to increase the contact area between the preloading section 322 and the control rod 21, so that the preloading member 32 and the control rod 21 always maintain effective contact, thereby driving the control rod 21 to move.

[0060] In some embodiments, the piezoelectric driving portion 31 includes piezoelectric sheets, and the piezoelectric sheets include ceramic sheets and metal sheets 311. The ceramic sheets and the metal sheets 311 are alternately stacked and bonded to each other to form the piezoelectric driving portion 31. Alternatively, the piezoelectric driving portion 31 can be formed by stacking ceramic sheets with each other, which is set according to specific circumstances and is not limited herein.

[0061] In some embodiments, as Figure 12 shown, Figure 12Shown is a piezoelectric drive unit 31 formed by alternately stacking ceramic sheets and metal sheets 311. The metal sheets 311 are in a sheet structure, and tab ears 3111 are provided on the peripheral side of the metal sheets 311, eliminating the need for assemblers to manually dot electrodes. Among them, the tab ears 3111 of two adjacent metal sheets 311 are arranged in a staggered manner. That is to say, when the tab ears 3111 of one layer of metal sheets 311 are arranged on one side of the metal sheets 311, after stacking one layer of ceramic sheets and then stacking another layer of metal sheets 311, the tab ears 3111 of this layer of metal sheets 311 can be arranged on the same side and be staggered with the tab ears 3111 of the upper layer of metal sheets 311. Or, the tab ears 3111 of this layer of metal sheets 311 can also be arranged on the other side of the metal sheets 311 to prevent the tab ears 3111 of two adjacent metal sheets 311 from coming into contact with each other and prevent the piezoelectric drive unit 31 from short-circuiting. Among them, the tab ears 3111 can extend relative to the extending direction of the metal sheets 311 and bend along the first direction.

[0062] In some embodiments, in the present application, the piezoelectric drive unit 31 is used as the I / P conversion unit of the valve. The size of the piezoelectric drive unit 31 is 30mm × 45mm × 63mm, reducing the internal space occupied by the piezoelectric drive unit 31. And, since the piezoelectric sheets hardly come into contact with other components during use, the situation of the piezoelectric sheets being worn is avoided. Moreover, the operating life of the piezoelectric sheets is as high as billions of times. During use, the valve will not malfunction due to the damage of the piezoelectric sheets, making the valve more reliable during use.

[0063] Embodiment 1

[0064] As Figure 3 shown, the present application provides a valve body 10. The air inlet 101 and the air outlet 102 are staggeredly arranged on opposite sides of the valve body 10. The control rod 21 passes through the first valve portion 11 and the second valve portion 12. The control rod 21 includes a first rod body 211, a second rod body 212, and a fulcrum portion 213. The fulcrum portion 213 is provided between the first rod body 211 and the second rod body 212. The control rod 21 rotates around the fulcrum portion 213 as the rotation center. When the piezoelectric drive unit 31 is powered on, the piezoelectric sheets bend and deform, causing the piezoelectric drive unit 31 to generate a displacement in the vertical direction, pushing the contact section 215 of the second rod body 212 to move along the first direction and abut against the preloading member 32, causing the control rod 21 to rotate around the fulcrum portion 213 as the rotation center. The free section 214 of the first rod body 211 moves away from the air inlet 101, and the free section 214 presses against the elastic member 112. At this moment, the preloading force is greater than the supporting force of the elastic member 112, and the valve opens. After the piezoelectric drive unit 31 is powered off, the piezoelectric drive unit 31 resets, the contact section 215 moves downward, the free section 214 moves upward, and the elastic member 112 pushes the free section 214 to abut against the air inlet 101. At this time, the preloading force is less than the supporting force to seal the air inlet 101, and the valve closes.

[0065] Embodiment 2

[0066] As Figure 11 shown, the present application also provides another valve body 10. The air inlet 101 and the air outlet 102 are arranged on the same side of the valve body 10. The first rod body 211 is arranged in the first valve portion 11, and the second rod body 212 is arranged in the second valve portion 12. Moreover, the first rod body 211 and the second rod body 212 form a control rod 21, and the fulcrum portion 213 is arranged at the end of the second rod body 212 away from the first rod body 211. When the piezoelectric driving portion 31 is powered on, the piezoelectric sheet bends and deforms, and the piezoelectric driving portion 31 generates a displacement amount in the vertical direction, pushing the pre-compression member 32 to deform, so as to elastically abut against the second rod body 212. The second rod body 212 moves upward, driving the first rod body 211 to move upward. The first rod body 211 moves upward, squeezing the elastic member 112, and the air inlet 101 is opened. When the piezoelectric driving portion 31 is powered off, the piezoelectric sheet returns to its original shape, the piezoelectric driving portion 31 resets, the second rod body 212 moves downward, driving the first rod body 211 to move downward. The elastic member 112 elongates, pushing the first rod body 211 to move downward to seal the air inlet 101. The fulcrum portion 213 is arranged at the end of the second rod body 212 away from the first rod body 211, which can, to a certain extent, avoid the wear of the control rod 21 and improve the service life of the control rod 21.

[0067] In some embodiments, the valve selects the piezoelectric driving portion 31 as the I / P conversion unit. Among them, the I / P conversion unit is an electrical-pneumatic conversion device, and its main function is: to convert an electrical signal into a pneumatic pressure signal, so as to control the opening degree of a pneumatic control valve to achieve precise control of the fluid flow rate. The working principle of the traditional force balance type I / P conversion unit is: based on the balance between the electromagnetic force and the spring reaction force, the air pressure output is controlled through the nozzle baffle mechanism. There is always a small distance between the nozzle and the baffle, and this distance is maintained by the balance of forces. When the valve is installed in an environment with large vibrations, the vibrations will cause the distance between the nozzle and the baffle to change. Because the position of the baffle is prone to swing left and right, the output air pressure is unstable, which in turn affects the positioning accuracy and control effect of the valve. However, the valve provided by the present application is based on the characteristics of the piezoelectric sheet. When powered on, the piezoelectric sheet bends and deforms, thereby controlling the on-off of the fluid. The opening and closing of the valve are realized by the piezoelectric sheet deforming when powered on and recovering when powered off. It will not change the deformation degree of the piezoelectric sheet due to vibrations. At the same time, the number of movable parts inside the valve is reduced. The fewer the movable parts, the lower the probability of being affected by vibrations, thereby improving the anti-vibration performance of the valve.

[0068] The foregoing has described the basic principles, main features, and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present application. Without departing from the spirit and scope of the present application, various changes and improvements will occur to the present application, and these changes and improvements all fall within the scope of the present application claimed. The scope of protection required by the present application is defined by the appended claims and their equivalents.

Claims

1. A piezoelectric stacked lever valve, characterized in that: include: A valve body, wherein the valve body is provided with an air inlet, an air outlet and a valve cavity, and the valve cavity is connected with the air inlet and the air outlet; A control assembly, the control assembly comprising a control rod, the control rod being installed in the valve cavity along a second direction, and one side of the control rod being adjustably facing the air inlet of the valve body; A driving assembly, the driving assembly includes a piezoelectric driving part and a pre-stressed part, the pre-stressed part elastically extends from the piezoelectric driving part to the other side of the control rod, so that the pre-stressed part and the other side of the control rod elastically abut against each other along a first direction, and when power is turned on, the piezoelectric driving part drives the pre-stressed part and the control rod to move along the first direction, so as to adjust the air intake amount of the air inlet.

2. The piezoelectric stack lever valve according to claim 1, characterized in that: The valve body further includes a first valve part and a second valve part, the air inlet and the air outlet are arranged at intervals in the first valve part, the drive assembly is adjustably mounted on the second valve part, and the control rod can be tiltably driven and mounted on the first valve part and the second valve part.

3. The piezoelectric stack lever valve according to claim 2, characterized in that: The control rod is provided with a first rod body, a second rod body and a fulcrum portion, wherein the first rod body is located on one side of the control rod and faces the air inlet of the first valve portion, the second rod body is located on the other side of the control rod and abuts against a pre-pressed piece in the second valve portion, the fulcrum portion is connected to an inner wall of the valve body, and a distance between the fulcrum portion and the pre-pressed piece along the second direction is smaller than a distance between the fulcrum portion and the air inlet along the second direction.

4. The piezoelectric stack lever valve according to claim 3, characterized in that: The valve body further includes an elastic member, which is deformably installed between the first rod body and the inner wall of the first valve part. The elastic member and the air inlet are arranged relatively to each other along a first direction. The elastic member provides a supporting force for the free section of the first rod body. At the same time, the pre-pressing member provides a pre-pressure for the contact section of the second rod body. When the piezoelectric driving part drives the pre-pressing member to move upward so that the pre-pressure is greater than the supporting force, the free section of the first rod body deviates from the air inlet. When the piezoelectric driving part drives the pre-pressing member to move downward so that the pre-pressure is less than the supporting force, the free section of the first rod body approaches the air inlet.

5. The piezoelectric stack lever valve according to claim 4, characterized in that: The first valve part is provided with a first cavity and a sealing groove, the second valve part is provided with a second cavity, the first cavity and the second cavity form the valve cavity, the first cavity is connected to the air inlet and the air outlet, the sealing groove is arranged between the first cavity and the second cavity, and the control component is provided with a sealing member, and the sealing member extends from the first rod body along a first direction to the sealing groove to cut off the gas flow in the first cavity and the second cavity.

6. The piezoelectric stacked lever valve according to any one of claims 3 to 5, characterized in that: The driving assembly further includes a positioning member and a base, the positioning member is provided with a positioning hole, the piezoelectric driving unit can be installed in the base along a first direction by piezoelectric actuation, the positioning member is fixed above the base, and the pre-pressed member can deformably pass through the positioning hole and abut against the contact section of the second rod body.

7. The piezoelectric stack lever valve according to claim 6, characterized in that: The pre-stressing component is provided with a deformation cavity, a pre-stressing section, a pair of elastic inclined sections and a pair of limiting sections. The elastic inclined section is integrally and obliquely connected to the pre-stressing section and the limiting section. The pre-stressing section is arc-shaped and connected to the top of the elastic inclined section. The deformation cavity is formed between the elastic inclined section and the pre-stressing section. The limiting section is bent outward and extends from the bottom end of the elastic inclined section. The elastic inclined section is elastically connected to both sides of the opening of the positioning hole, so that the pre-stressing component can be adaptively deformed and clamped in the positioning hole.

8. The piezoelectric stack lever valve according to claim 7, characterized in that: The shape of the pre-stressed part is generally V-structured, and the pre-stressed section is arranged between the pair of elastic oblique sections. The elastic oblique sections include a first elastic oblique section and a second elastic oblique section. One end of the pre-stressed section is connected to the first elastic oblique section, and the other end of the pre-stressed section is connected to the second elastic oblique section, and the first elastic oblique section and the second elastic oblique section are arranged opposite to each other along the second direction. When the piezoelectric driving part is energized, the piezoelectric driving part generates a first upward driving force, and the first driving force pushes the pre-stressed part to move upward, and the elastic oblique sections approach each other to generate a second upward driving force, and the combined force of the first driving force and the second driving force drives the control rod to move tiltedly.

9. The piezoelectric stack lever valve according to claim 6, characterized in that: The base is provided with a receiving cavity, the piezoelectric driving part is arranged in the receiving cavity, the piezoelectric driving part includes a plurality of piezoelectric sheets, and the piezoelectric sheets are stacked along the first direction.

10. The piezoelectric stack lever valve according to claim 9, characterized in that: The fulcrum portion is arranged between the first rod body and the second rod body; or the fulcrum portion is arranged at the end of the second rod body away from the first rod body; wherein the piezoelectric sheet includes a ceramic sheet and a metal sheet, the ceramic sheet and the metal sheet are alternately stacked along the first direction, and a pole ear is provided on the circumferential side of the metal sheet, the pole ear extends along the extension direction of the metal sheet, and is bent along the first direction.

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