A piezoelectric ceramic actuator switch valve

Abstract

The present invention provides a piezoelectric ceramic actuator switch valve, comprising an upper valve seat, a diaphragm, and a lower valve seat; the upper valve seat is internally provided with a first cavity and a second cavity; the diaphragm is located between the upper valve seat and the lower valve seat; an elastic member and a valve stem are internally provided with the upper valve seat; the lower valve seat is provided with a through hole; the end of the valve stem away from the second cavity abuts the elastic member so that, under the elastic force of the elastic member, the port of the second cavity near the first cavity is closed; a piezoelectric ceramic actuator is disposed in the through hole; the driving end of the piezoelectric ceramic actuator abuts the diaphragm pressure plate; the end of the diaphragm pressure plate away from the piezoelectric ceramic actuator penetrates the diaphragm and is fixedly connected to the valve stem. By utilizing the piezoelectric effect instead of conventional electromagnetic drive and using a piezoelectric ceramic actuator to achieve precise displacement adjustment, the holding current can be reduced, saving energy consumption; and by controlling the excitation voltage, the deformation within the piezoelectric ceramic actuator can be precisely controlled, thereby improving the control accuracy of the flow rate.

Description

Technical Field

[0001] The present invention belongs to the technical field of fluid control, and in particular relates to a piezoelectric ceramic actuator switch valve. Background Art

[0002] A valve is a device used to control the direction, pressure, and flow of fluids in a fluid system. It enables or stops the flow of media (liquids, gases, powders) within piping and equipment, and can control their flow. Valves are control components in pipeline fluid transportation systems, used to change the cross-section of the passage and the direction of the medium's flow. They perform functions such as diverting, shutting off, throttling, checking, diverting, or providing overflow and pressure relief. Valves used for fluid control come in a wide variety of types and specifications, from the simplest globe valves to valves used in highly complex automatic control systems. Their nominal diameters range from tiny instrument valves to valves for industrial pipelines with diameters up to 10 meters. They can be used to control the flow of various types of fluids, including water, steam, oil, gas, slurry, various corrosive media, liquid metal, and radioactive fluids.

[0003] Most existing automatic control system valves use electromagnetic actuators, which consume a large amount of holding current during operation. These actuators are also susceptible to interference from external electromagnetic fields, resulting in low displacement accuracy and difficulty in precisely controlling the gate opening. Therefore, addressing the low control accuracy and high energy consumption of existing solenoid valves is a pressing issue for those skilled in the art. Summary of the Invention

[0004] The present invention aims to address the deficiencies in the prior art and provides a piezoelectric ceramic actuator switch valve.

[0005] The present invention provides a piezoelectric ceramic actuator switch valve, comprising an upper valve seat, a diaphragm, and a lower valve seat; the upper valve seat is provided with a first cavity and a second cavity interconnected from top to bottom; a port of the second cavity away from the first cavity passes through the upper valve seat; the diaphragm is located between the upper valve seat and the lower valve seat to seal the port of the second cavity away from the first cavity; an elastic member and a valve stem are provided inside the upper valve seat; the valve stem is located in the first cavity and the second cavity; the lower valve seat is provided with a through hole passing through the lower valve seat;

[0006] The elastic member is fixedly connected to the upper valve seat; one end of the valve stem away from the second cavity abuts against the elastic member, so that under the elastic force of the elastic member, the port of the second cavity close to the first cavity is closed;

[0007] The upper valve seat is provided with an air inlet hole communicating with the first cavity and an air exhaust hole communicating with the second cavity; the first cavity, the second cavity, the air inlet hole and the air exhaust hole are in communication with each other when the valve stem does not close the port of the second cavity close to the first cavity;

[0008] A piezoelectric ceramic actuator is provided in the through hole; a driving end of the piezoelectric ceramic actuator abuts against a diaphragm pressure plate; an end of the diaphragm pressure plate away from the piezoelectric ceramic actuator passes through the diaphragm and is fixedly connected to the valve stem.

[0009] Furthermore, the valve stem includes a base, a first connecting column, a blocking block, a second connecting column and a third connecting column that are fixedly connected in sequence;

[0010] One end of the base away from the third connecting column abuts against the elastic member; under the elastic force of the elastic member, the blocking block abuts against the port of the second cavity close to the first cavity to close the port of the second cavity close to the first cavity;

[0011] The side walls of the first connecting column along the circumference of the first cavity do not contact the inner wall of the first cavity; the side walls of the second connecting column along the circumference of the second cavity do not contact the inner wall of the second cavity; the third connecting column is fixedly connected to the diaphragm pressure plate.

[0012] Furthermore, the elastic member includes a spring mounting seat and a spring;

[0013] The spring mounting seat is screwed to the upper valve seat to close the port of the first cavity away from the second cavity; the two ends of the spring respectively abut against the spring mounting seat and the base.

[0014] Furthermore, the first cavity, the second cavity, the base, the first connecting column, the blocking block, the second connecting column, the third connecting column and the through hole all have circular structures in cross-section along a direction perpendicular to the length of the first cavity.

[0015] Furthermore, a pre-tightening assembly is screwed onto one end of the through hole away from the upper valve seat;

[0016] The pre-tightening assembly includes a pre-tightening connector and a pre-tightening bolt; the pre-tightening connector is screwed into the through hole; the pre-tightening bolt is screwed into the pre-tightening connector and an end portion is fixedly connected to the piezoelectric ceramic actuator.

[0017] Furthermore, the first cavity, the second cavity, the spring mounting seat, the spring, the base, the first connecting column, the blocking block, the second connecting column, the third connecting column, the through hole, the piezoelectric ceramic actuator, the pre-tightening connector and the pre-tightening bolt are on the same axis along an axis parallel to the length direction of the first cavity.

[0018] Furthermore, the number of the first cavity, the second cavity, the elastic member, the valve stem, the through hole, the piezoelectric ceramic actuator and the diaphragm pressure plate are all multiple and equal; the multiple first cavities and the multiple second cavities are interconnected when the valve stem does not close the port of the second cavity close to the first cavity.

[0019] Furthermore, the piezoelectric ceramic actuator switch valve further includes a controller; the controller is electrically connected to the piezoelectric ceramic actuator and is used to control the excitation voltage of the piezoelectric ceramic actuator.

[0020] Furthermore, the piezoelectric ceramic actuator switching valve further includes a display connected to the controller by signal, and the display is used to display the excitation voltage of the piezoelectric ceramic actuator.

[0021] The present invention provides a piezoelectric ceramic actuator switch valve, comprising an upper valve seat, a diaphragm and a lower valve seat; the upper valve seat is provided with a first cavity and a second cavity interconnected from top to bottom; the second cavity is away from the port of the first cavity and passes through the upper valve seat; the diaphragm is located between the upper valve seat and the lower valve seat to close the port of the second cavity away from the first cavity; an elastic member and a valve stem are provided inside the upper valve seat; the valve stem is located in the first cavity and the second cavity; the lower valve seat is provided with a through hole passing through the lower valve seat; the elastic member is fixedly connected to the upper valve seat; the valve stem is away from the One end of the second cavity abuts the elastic member to close the port of the second cavity close to the first cavity under the elastic force of the elastic member; the upper valve seat is provided with an air inlet hole connected to the first cavity and an exhaust hole connected to the second cavity; the first cavity, the second cavity, the air inlet hole and the exhaust hole are connected to each other when the valve stem does not close the port of the second cavity close to the first cavity; a piezoelectric ceramic actuator is provided in the through hole; the driving end of the piezoelectric ceramic actuator abuts the diaphragm pressure plate; the end of the diaphragm pressure plate away from the piezoelectric ceramic actuator passes through the diaphragm and is fixedly connected to the valve stem.

[0022] The present invention utilizes the aforementioned device, controlling the excitation voltage of the piezoelectric ceramic actuator through a controller, thereby controlling the displacement change of the driving end of the piezoelectric ceramic actuator, thereby controlling the distance between the blocking block and the port of the second cavity close to the first cavity, thereby achieving control of the flow rate within the second cavity. Therefore, the piezoelectric ceramic actuator switch valve provided by the present invention utilizes the piezoelectric effect instead of conventional electromagnetic drive. By using a piezoelectric ceramic actuator to achieve precise displacement adjustment, it can reduce the holding current and save energy. At the same time, because the deformation within the piezoelectric ceramic actuator is related to the voltage applied to it and is not subject to electromagnetic interference, the deformation within the piezoelectric ceramic actuator can be precisely controlled by controlling the excitation voltage, thereby improving the control accuracy of the flow rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 A schematic structural diagram of a piezoelectric ceramic actuator switch valve provided in an embodiment of the present invention;

[0025] Figure 2 A three-dimensional diagram of a piezoelectric ceramic actuator switch valve provided in an embodiment of the present invention.

[0026] Among them, 1. upper valve seat, 11. first cavity, 12. second cavity; 2. diaphragm; 3. lower valve seat, 31. through hole, 32. piezoelectric ceramic actuator, 33. diaphragm pressure plate, 34. pre-tightening assembly, 341. pre-tightening connector, 342. pre-tightening bolt; 4. elastic part, 41. spring mounting seat, 42. spring; 5. valve stem, 51. base, 52. first connecting column, 53. sealing block, 54. second connecting column, 55. third connecting column; 6. air inlet; 7. exhaust hole. DETAILED DESCRIPTION

[0027] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0028] like Figure 1As shown, an embodiment of the present invention provides a piezoelectric ceramic actuator switch valve, comprising an upper valve seat 1, a diaphragm 2 and a lower valve seat 3; the upper valve seat 1 is provided with a first cavity 11 and a second cavity 12 that are interconnected from top to bottom; the port of the second cavity 12 away from the first cavity 11 passes through the upper valve seat 1; the diaphragm 2 is located between the upper valve seat 1 and the lower valve seat 3 to close the port of the second cavity 12 away from the first cavity 11; an elastic member 4 and a valve stem 5 are provided inside the upper valve seat 1; the valve stem 5 is located in the first cavity 11 and the second cavity 12; the lower valve seat 3 is provided with a through hole 31 that passes through the lower valve seat 3; the elastic member 4 is fixedly connected to the upper valve seat 1; the valve stem 5 is away from The end away from the second cavity 12 abuts against the elastic member 4, so that under the elastic force of the elastic member 4, the port of the second cavity 12 close to the first cavity 11 is closed; the upper valve seat 1 is provided with an air inlet 6 connected to the first cavity 11 and an exhaust hole 7 connected to the second cavity 12; the first cavity 11, the second cavity 12, the air inlet 6 and the exhaust hole 7 are connected to each other when the valve stem 5 does not close the port of the second cavity 12 close to the first cavity 11; a piezoelectric ceramic actuator 32 is provided in the through hole 31; the driving end of the piezoelectric ceramic actuator 32 abuts against the diaphragm pressure plate 33; the end of the diaphragm pressure plate 33 away from the piezoelectric ceramic actuator 32 passes through the diaphragm 2 and is fixedly connected to the valve stem 5.

[0029] In the embodiment, the fluid enters the first cavity 11 from the air inlet 6. When the piezoelectric ceramic actuator 32 is not excited by voltage or the voltage excitation is insufficient, the driving end of the piezoelectric ceramic actuator 32 does not move. Under the elastic force of the elastic member 4, the valve stem 5 is in close contact with the port of the second cavity 12 near the first cavity 11, thereby sealing the port of the second cavity 12 near the first cavity 11. The fluid in the first cavity 11 cannot enter the second cavity 12, that is, the fluid passage is closed. When a suitable excitation voltage is applied to the piezoelectric ceramic actuator 32, the driving end of the piezoelectric ceramic actuator 32 is thrusted and displaced. The driving end of the piezoelectric ceramic actuator 32 pushes the diaphragm pressure plate 33, thereby causing the valve stem 5 to close the port of the second cavity 12 near the first cavity 11 and move away from the port of the second cavity 12 near the first cavity 11. In other words, a passage is formed between the first cavity 11 and the second cavity 12, and the fluid in the first cavity 11 enters the second cavity 12 and is finally discharged through the exhaust hole 7.

[0030] For example, the piezoelectric ceramic actuator switching valve provided in an embodiment of the present invention further includes a controller and a display connected to the controller via a signal. The controller is electrically connected to the piezoelectric ceramic actuator 32 and is used to control the excitation voltage of the piezoelectric ceramic actuator 32. The display is used to display the excitation voltage of the piezoelectric ceramic actuator 32. The controller sends a signal to apply voltage to the piezoelectric ceramic actuator 32, causing the piezoelectric ceramic disc inside the piezoelectric ceramic actuator 32 to deform and expand due to the piezoelectric effect. The controller can detect the deformation of the piezoelectric ceramic disc as a feedback signal. The controller determines the actual deformation of the piezoelectric ceramic disc and displays it on the display to facilitate the next adjustment.

[0031] By controlling the excitation voltage of the piezoelectric ceramic actuator 32 through a controller, the displacement change of the driving end of the piezoelectric ceramic actuator 32 can be controlled to control the distance between the port of the valve stem 5 that closes the second cavity 12 close to the first cavity 11 and the port of the second cavity 12 close to the first cavity 11, thereby achieving control of the flow rate in the second cavity 12. Therefore, the piezoelectric ceramic actuator switch valve provided by the present invention utilizes the piezoelectric effect to replace the conventional electromagnetic drive. By using the piezoelectric ceramic actuator 32 to achieve precise displacement adjustment, it is possible to reduce the holding current and save energy. At the same time, because the deformation of the piezoelectric ceramic sheet inside the piezoelectric ceramic actuator 32 is related to the voltage applied thereto and is not subject to electromagnetic interference, the deformation of the piezoelectric ceramic sheet inside the piezoelectric ceramic actuator 32 can be precisely controlled by controlling the excitation voltage, thereby improving the control accuracy of the flow rate.

[0032] On the basis of the above embodiment, the valve stem 5 includes a base 51, a first connecting column 52, a blocking block 53, a second connecting column 54 and a third connecting column 55, which are fixedly connected in sequence. The end of the base 51 away from the third connecting column 55 abuts the elastic member 4; under the elastic force of the elastic member 4, the blocking block 53 abuts the port of the second cavity 12 close to the first cavity 11 to close the port of the second cavity 12 close to the first cavity 11. The side walls of the first connecting column 52 along the circumference of the first cavity 11 do not contact the inner wall of the first cavity 11, ensuring that the fluid in the air inlet 6 can enter the first cavity 11; the side walls of the second connecting column 54 along the circumference of the second cavity 12 do not contact the inner wall of the second cavity 12, preventing the second connecting column 54 from preventing the fluid in the first cavity 11 from entering the second cavity 12; the third connecting column 55 is fixedly connected to the diaphragm pressure plate 33.

[0033] Based on the above embodiment, the elastic member 4 includes a spring mounting seat 41 and a spring 42; the spring mounting seat 41 is screwed to the upper valve seat 1 to close the port of the first cavity 11 away from the second cavity 12; the two ends of the spring 42 respectively abut the spring mounting seat 41 and the base 51 to provide a force for the sealing block 53 to closely contact the port of the second cavity 12 close to the first cavity 11.

[0034] Based on the above embodiments, the first cavity 11, the second cavity 12, the base 51, the first connecting column 52, the blocking block 53, the second connecting column 54, the third connecting column 55 and the through hole 31 are all circular structures along the cross-section perpendicular to the length direction of the first cavity 11, which reduces the resistance of the base 51, the first connecting column 52 and the blocking block 53 to move in the first cavity 11 and the resistance of the second connecting column 54 and the third connecting column 55 to move in the second cavity 12.

[0035] Based on the above embodiment, a pre-tightening assembly 34 is threadedly connected to the end of through-hole 31 away from upper valve seat 1. Pre-tightening assembly 34 comprises a pre-tightening connector 341 and a pre-tightening bolt 342. Pre-tightening connector 341 is threadedly connected to through-hole 31. Pre-tightening bolt 342 is threadedly connected to pre-tightening connector 341 and its end is fixedly connected to piezoelectric ceramic actuator 32. Pre-tightening bolt 342 is used to adjust the driving end of piezoelectric ceramic actuator 32 against diaphragm pressure plate 33 and also serves to secure piezoelectric ceramic actuator 32.

[0036] On the basis of the above embodiment, the first cavity 11, the second cavity 12, the spring mounting seat 41, the spring 42, the base 51, the first connecting column 52, the blocking block 53, the second connecting column 54, the third connecting column 55, the through hole 31, the piezoelectric ceramic actuator 32, the pre-tightening connector 341 and the pre-tightening bolt 342 are arranged along the same axis parallel to the length direction of the first cavity 11, so as to maximize the collinearity of the elastic force direction of the spring 42 and the thrust direction of the piezoelectric ceramic actuator 32, and also reduce the resistance of the base 51, the first connecting column 52 and the blocking block 53 to move in the first cavity 11 and the resistance of the second connecting column 54 and the third connecting column 55 to move in the second cavity 12.

[0037] Based on the above embodiments, Figure 2 As shown, the number of the first cavity 11, the second cavity 12, the elastic member 4, the valve stem 5, the through hole 31, the piezoelectric ceramic actuator 32 and the diaphragm pressure plate 33 are all multiple and equal, and the specific number can be flexibly set according to actual needs; the multiple first cavities 11 and the multiple second cavities 12 are interconnected when the valve stem 5 does not close the port of the second cavity 12 close to the first cavity 11, and the connection method can also be flexibly set according to actual needs.

[0038] The present invention has been described in detail above with reference to specific embodiments and exemplary examples. However, these descriptions should not be construed as limiting the present invention. Those skilled in the art will appreciate that various equivalent substitutions, modifications, or improvements may be made to the technical solutions and implementations of the present invention without departing from the spirit and scope of the present invention, all of which fall within the scope of the present invention. The scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A piezoelectric ceramic actuator switch valve, characterized in that: The invention comprises an upper valve seat (1), a diaphragm (2) and a lower valve seat (3); the upper valve seat (1) is provided with a first cavity (11) and a second cavity (12) which are interconnected from top to bottom; the port of the second cavity (12) away from the first cavity (11) passes through the upper valve seat (1); the diaphragm (2) is located between the upper valve seat (1) and the lower valve seat (3) to seal the port of the second cavity (12) away from the first cavity (11); the upper valve seat (1) is provided with an elastic member (4) and a valve stem (5); the valve stem (5) is located in the first cavity (11) and the second cavity (12); the lower valve seat (3) is provided with a through hole (31) which passes through the lower valve seat (3); The elastic member (4) is fixedly connected to the upper valve seat (1); one end of the valve stem (5) away from the second cavity (12) abuts against the elastic member (4), so as to close the port of the second cavity (12) close to the first cavity (11) under the elastic force of the elastic member (4); The upper valve seat (1) is provided with an air inlet (6) communicating with the first cavity (11) and an air outlet (7) communicating with the second cavity (12); the first cavity (11), the second cavity (12), the air inlet (6) and the air outlet (7) are in communication with each other when the valve stem (5) does not close the port of the second cavity (12) close to the first cavity (11); A piezoelectric ceramic actuator (32) is provided in the through hole (31); a driving end of the piezoelectric ceramic actuator (32) abuts against a diaphragm pressure plate (33); an end of the diaphragm pressure plate (33) away from the piezoelectric ceramic actuator (32) passes through the diaphragm (2) and is fixedly connected to the valve stem (5); The valve stem (5) comprises a base (51), a first connecting column (52), a blocking block (53), a second connecting column (54) and a third connecting column (55) which are fixedly connected in sequence; One end of the base (51) away from the third connecting column (55) abuts against the elastic member (4); under the elastic force of the elastic member (4), the blocking block (53) abuts against the port of the second cavity (12) close to the first cavity (11) to close the port of the second cavity (12) close to the first cavity (11); The side walls of the first connecting column (52) along the circumference of the first cavity (11) do not contact the inner wall of the first cavity (11); the side walls of the second connecting column (54) along the circumference of the second cavity (12) do not contact the inner wall of the second cavity (12); and the third connecting column (55) is fixedly connected to the diaphragm pressure plate (33).

2. The piezoelectric ceramic actuator switch valve according to claim 1, characterized in that: The elastic member (4) includes a spring mounting seat (41) and a spring (42); The spring mounting seat (41) is screwed to the upper valve seat (1) to close the port of the first cavity (11) away from the second cavity (12); the two ends of the spring (42) respectively abut the spring mounting seat (41) and the base (51).

3. The piezoelectric ceramic actuator switch valve according to claim 2, characterized in that: The first cavity (11), the second cavity (12), the base (51), the first connecting column (52), the blocking block (53), the second connecting column (54), the third connecting column (55) and the through hole (31) are all circular structures in cross-section along a direction perpendicular to the length of the first cavity (11).

4. The piezoelectric ceramic actuator switch valve according to claim 3, characterized in that: One end of the through hole (31) away from the upper valve seat (1) is screwed with a pre-tightening component (34); The pre-tightening assembly (34) comprises a pre-tightening connector (341) and a pre-tightening bolt (342); the pre-tightening connector (341) is screwed to the through hole (31); the pre-tightening bolt (342) is screwed to the pre-tightening connector (341) and its end is fixedly connected to the piezoelectric ceramic actuator (32).

5. The piezoelectric ceramic actuator switch valve according to claim 4, characterized in that: The first cavity (11), the second cavity (12), the spring mounting seat (41), the spring (42), the base (51), the first connecting column (52), the blocking block (53), the second connecting column (54), the third connecting column (55), the through hole (31), the piezoelectric ceramic actuator (32), the pre-tightening connecting member (341) and the pre-tightening bolt (342) are arranged on the same axis along an axis parallel to the length direction of the first cavity (11).

6. The piezoelectric ceramic actuator switch valve according to claim 1, characterized in that: The number of the first cavity (11), the second cavity (12), the elastic member (4), the valve stem (5), the through hole (31), the piezoelectric ceramic actuator (32) and the diaphragm pressure plate (33) are all multiple and equal; the multiple first cavities (11) and the multiple second cavities (12) are interconnected when the valve stem (5) does not close the port of the second cavity (12) close to the first cavity (11).

7. The piezoelectric ceramic actuator switch valve according to claim 1, characterized in that: A controller is also included; the controller is electrically connected to the piezoelectric ceramic actuator (32) and is used to control the excitation voltage of the piezoelectric ceramic actuator (32).

8. The piezoelectric ceramic actuator switching valve according to claim 7, characterized in that: Also included is a display connected to the controller by signal, the display being used to display the excitation voltage of the piezoelectric ceramic actuator (32).

Images