CN116045055A

CN116045055A - Piezoelectric actuator and fluid control valve

Info

Publication number: CN116045055A
Application number: CN202310019552.6A
Authority: CN
Inventors: 韦文术; 卢德来; 王伟; 姚卓; 李向波; 任伟
Original assignee: Beijing Meike Tianma Automation Technology Co Ltd; Beijing Tianma Intelligent Control Technology Co Ltd
Current assignee: Beijing Meike Tianma Automation Technology Co Ltd; Beijing Tianma Intelligent Control Technology Co Ltd
Priority date: 2023-01-06
Filing date: 2023-01-06
Publication date: 2023-05-02

Abstract

The invention relates to the technical field of flow control equipment, in particular to a piezoelectric actuator and a fluid control valve.

Description

Piezoelectric actuator and fluid control valve

Technical Field

Background

Piezoelectric ceramics are information-function ceramic materials capable of mutually converting mechanical energy and electric energy, including positive piezoelectric properties and reverse piezoelectric properties. Positive-voltage electrical property means that under the action of mechanical external force, positive and negative charge centers in a certain dielectric medium are relatively displaced to cause polarization, so that bound charges with opposite signs appear in the surfaces of two ends of the dielectric medium, and a potential difference is formed. Conversely, piezoelectricity refers to the application of a potential difference across the end surfaces of some dielectrics to cause displacement and mechanical forces.

The piezoelectric actuator is a micro-distance telescopic device based on piezoelectric ceramics, and the inside of the micro-distance telescopic device is provided with a plurality of layers of stacked sheet piezoelectric ceramics, and the driving rod is driven to displace through the action of the plurality of layers of piezoelectric ceramics.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, the embodiment of the invention provides the piezoelectric actuator, which can improve the stroke of the piezoelectric actuator and reduce the energy consumption of the piezoelectric actuator.

The embodiment of the invention also provides a fluid control valve.

The piezoelectric actuator of the embodiment of the invention comprises: a housing; the driving component is arranged in the shell and can move in the length direction of the shell; the piezoelectric ceramic piece and the cable are arranged in the shell, the piezoelectric ceramic piece is arranged in the cavity, one end of the cable penetrates through the shell to be connected with one end of the piezoelectric ceramic piece, and the other end of the piezoelectric ceramic piece is connected with the driving part; and one end of the swing rod is pivoted with the shell, the other end of the swing rod can swing, and the swing rod is abutted with the driving part.

The piezoelectric actuator provided by the embodiment of the invention can improve the stroke of the piezoelectric actuator and reduce the energy consumption of the piezoelectric actuator.

In some embodiments, the piezoelectric actuator further comprises an adjustment assembly for adjusting the depth to which the end of the pendulum rod remote from the housing extends into the valve body.

In some embodiments, the driving component comprises a detachably connected driving block and a driving rod, the adjusting component is arranged in the shell, the adjusting component comprises a connecting sleeve, the connecting sleeve penetrates through the driving block, the driving rod stretches into the connecting sleeve, and the depth of the driving rod stretching into the connecting sleeve is adjustable.

In some embodiments, the driving component comprises a driving block and a driving rod which are integrally formed, the adjusting component is arranged outside the shell, the adjusting component is connected with the swinging rod, the adjusting component is connected with one end of the swinging rod away from the shell, the adjusting component comprises an adjusting rod, the adjusting rod is arranged in the swinging rod in a penetrating mode, the adjusting rod is movable in the length direction of the shell, and one end of the adjusting rod is suitable for extending into the valve body.

In some embodiments, the piezoelectric actuator further includes a first elastic member disposed in the chamber, the first elastic member is sleeved on the driving member, one end of the first elastic member abuts against one side of the driving member away from the piezoelectric ceramic sheet, and the other end of the first elastic member abuts against an inner wall surface of the housing.

In some embodiments, the distance between the end of the pendulum bar remote from the pivot point and the pivot point is D1, the distance between the abutment of the drive member with the pendulum bar and the pivot point of the pendulum bar is D2, and D1: d2 =1 to 10.

The fluid control valve of the embodiment of the invention comprises: the valve comprises a valve body and a valve core, wherein the valve core is arranged in the valve body and can move in the length direction of the valve body; a piezoelectric actuator coupled to the valve body, the piezoelectric actuator comprising a piezoelectric actuator according to any one of the embodiments described above; the transmission rod, the one end of transmission rod with the pendulum rod butt, the other end of transmission rod with the case butt, or, the one end of transmission rod with adjust the pole butt, the other end of transmission rod with the case butt.

The fluid control valve provided by the embodiment of the invention can improve the control precision of the fluid control valve.

In some embodiments, the valve core is provided with a containing groove, and the valve core is provided with a connecting hole, one end of the connecting hole is connected with the liquid inlet, and the other end of the connecting hole is communicated with the containing groove.

In some embodiments, the fluid control valve further comprises an end cap coupled to the valve body to seal the valve body and a second resilient member abutting the end cap at an end thereof remote from the valve core.

In some embodiments, the fluid control valve further comprises a first seal ring that is sleeved on the end cap, and the first seal ring is located between the end cap and the valve body.

In some embodiments, the fluid control valve further comprises a lock nut that is sleeved on the housing.

Drawings

Fig. 1 is a schematic structural view of a piezoelectric actuator according to an embodiment of the present invention.

Fig. 2 is a schematic structural view of a piezoelectric actuator according to another embodiment of the present invention.

FIG. 3 is a schematic structural view of a fluid control valve according to an embodiment of the present invention, and the fluid control valve is in a closed state.

FIG. 4 is a schematic structural view of a fluid control valve according to an embodiment of the present invention, and the fluid control valve is in an open state.

Reference numerals:

valve body 100, valve core 110, coupling hole 1101, piezoelectric actuator 200, transmission rod 300, first seal ring 400, end cap 500, second elastic member 600, coupling sleeve 700, lock nut 710, second seal ring 800,

the device comprises a shell 1, a chamber 11, a driving part 2, a driving block 21, a driving rod 22, a piezoelectric ceramic plate 3, a second through hole 31, a cable 4, a swinging rod 5, a first through hole 51, an adjusting component 6, a connecting sleeve 61, an adjusting rod 62, a first elastic piece 7, a mounting seat 8 and a rotating shaft 9.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.

As shown in fig. 1 and 2, the piezoelectric actuator 200 of the embodiment of the present invention includes a housing 1, a driving part 2, a piezoelectric ceramic plate 3, a cable 4, a swing link 5, and an adjustment assembly 6.

In some embodiments, the driving part 2 is provided inside the housing 1, and the driving part 2 is movable in a length direction (left-right direction as shown in fig. 1) of the housing 1. The casing 1 is internally provided with a cavity 11, the piezoelectric ceramic plate 3 is arranged in the cavity 11, one end of the cable 4 penetrates through the casing 1 to be connected with one end of the piezoelectric ceramic plate 3, and the other end of the piezoelectric ceramic plate 3 is connected with the driving part 2. One end of the swing rod 5 is pivoted with the shell 1, the other end of the swing rod 5 can swing, and the swing rod 5 is abutted with the driving part 2. The adjusting assembly 6 is used for adjusting the depth of the end of the swing rod 5, which is far away from the shell 1, extending into the valve body 100.

Specifically, the piezoelectric ceramic plate 3 is disposed in the cavity 11, the right end of the driving component 2 is connected with the left end of the piezoelectric ceramic plate 3, the left end of the driving component 2 is abutted against the middle of the right side of the swing rod 5, the upper end of the swing rod 5 is pivoted with the housing 1, the lower end of the swing rod 5 can rotate around the pivot point, the distance between the lower end of the swing rod 5 and the housing 1 is adjusted through the adjusting component 6, and then the depth of the lower end of the swing rod 5 extending into the valve core 110 is adjusted, so that the initial installation position of the swing rod 5 is adjusted.

Optionally, the piezoelectric actuator 200 further includes a mounting seat 8 and a rotation shaft 9, the right end of the mounting seat 8 is connected with the left end of the housing 1, the upper end of the swing rod 5 is provided with a first through hole 51, the lower end of the rotation shaft 9 sequentially passes through the mounting seat 8 and the first through hole 51 to fix the upper end of the swing rod 5 on the mounting seat 8, so that the pivot joint between the swing rod 5 and the mounting seat 8 is realized, that is, the swing rod 5 can rotate around the rotation shaft.

For example, the mounting seat 8 and the housing 1 may be connected by screw, and the present invention is not limited to a specific connection manner between the mounting seat 8 and the housing 1, as long as the rigid connection between the mounting seat 8 and the housing 1 can be achieved, which falls within the scope of the present invention.

It should be noted that, since the distance of the piezoelectric ceramic plate 3 extending axially is in the micrometer level, the adjustment of the piezoelectric actuator 200 to the displacement is in the micrometer level, generally in the range of 0-500 μm, and the moving distance of the valve core 110 is in the millimeter level, generally in the range of 0.1-50mm, when the piezoelectric actuator 200 is in use, if the initial installation position of the piezoelectric actuator 200 deviates, the working area of the piezoelectric actuator 200 is exceeded, and the piezoelectric actuator 200 is caused to fail to adjust, frequent disassembly of the piezoelectric actuator 200 is required to adjust the installation position of the piezoelectric actuator 200, that is, the installation position of the piezoelectric actuator 200 is required to be very high when the piezoelectric actuator 200 is in use, the distance of the swing rod 5 extending into the valve body 100 is adjusted by setting the adjusting assembly 6, so that the accuracy requirement of the piezoelectric actuator 200 to the installation position is reduced, the initial installation position adjustment of the piezoelectric actuator 200 is realized, and the installation efficiency of the piezoelectric actuator 200 is improved.

When the lower end of the cable 4 passes through the shell 1 to apply potential difference to the two ends of the piezoelectric ceramic sheet 3, the piezoelectric ceramic sheet 3 axially extends, the driving part 2 moves leftwards under the axial extension effect of the piezoelectric ceramic sheet 3, the left end of the driving part 2 is abutted with the middle part of the right side of the swing rod 5 to push the swing rod 5 to move leftwards, the swing rod 5 is driven to rotate leftwards around the rotating shaft 9 by the leftwards movement of the swing rod 5, the lower end of the swing rod 5 can generate larger displacement under the leftwards effect of the driving part 2, namely, the middle part of the swing rod 5 is pushed to rotate leftwards by the driving part 2, so that the lower end of the swing rod 5 can generate larger displacement, and the stroke of the piezoelectric actuator 200 is improved.

It should be noted that, in the related art, in order to increase the displacement amount generated by the piezoelectric actuator 200, several tens to several hundreds of piezoelectric ceramic plates 3 need to be stacked to increase the displacement amount of the piezoelectric actuator 200, but stacking a plurality of piezoelectric ceramic plates 3 increases the size and volume of the piezoelectric actuator 200, by using a smaller number of piezoelectric ceramic plates 3 to stack, the driving member 2 is driven to move leftwards, so that the driving member 2 drives the middle part of the swing rod 5 to displace leftwards, and according to the lever principle, the displacement amount of the driving member 2 leftwards under the action force of the axial extension of the piezoelectric ceramic plates 3 is smaller than the displacement amount of the lower part of the swing rod 5, that is, by using a smaller number of piezoelectric ceramic plates 3 to stack, the stroke of the piezoelectric actuator 200 is increased, and by using a smaller number of piezoelectric ceramic plates 3, the size and volume of the piezoelectric actuator 200 can be reduced, so that the cost and consumption of the piezoelectric actuator 200 can be reduced.

In some embodiments, the drive member 2 comprises a drive block 21 and a drive rod 22 detachably connected, the adjustment assembly 6 is provided in the housing 1, and the adjustment assembly 6 comprises a connection sleeve 61, the connection sleeve 61 is provided in the drive block 21 in a penetrating manner, the drive rod 22 extends into the connection sleeve 61, and the depth of the drive rod 22 extending into the connection sleeve 61 is adjustable.

Specifically, the connecting sleeve 61 is arranged in the driving block 21 in a penetrating manner, the right end of the driving rod 22 stretches into the connecting sleeve 61 and is detachably connected with the driving block 21 to adjust the depth of the right end of the driving rod 22 stretching into the driving block 21, the right end of the driving block 21 is connected with the piezoelectric ceramic plate 3, the left end of the driving rod 22 is abutted with the middle part of the right side of the swinging rod 5, the upper end of the swinging rod 5 is pivoted with the mounting seat 8, the lower end of the swinging rod 5 can rotate around a pivot point, and the length of the left end of the swinging rod 5 stretching into the valve body 100 is adjusted by adjusting the depth of the right end of the driving rod 22 stretching into the connecting sleeve 61, so that the adjustment of the initial mounting position of the piezoelectric actuator 200 is realized, and the mounting efficiency of the piezoelectric actuator 200 is improved.

Optionally, the piezoelectric ceramic plate 3 is in an annular structure, the second through hole 31 is arranged at the central shaft position of the piezoelectric ceramic plate 3, the connecting sleeve 61 is arranged in the driving block 21 in a penetrating manner, the left end of the adjusting tool can extend into the second through hole 31 to be inserted into the connecting sleeve 61 so as to adjust the distance that the right end of the driving rod 22 extends into the connecting sleeve 61, and then the length that the lower end of the swing rod 5 extends into the valve body 100 is adjusted, so that the initial installation position of the piezoelectric actuator 200 is adjusted, and the installation efficiency of the piezoelectric actuator 200 is improved.

According to the embodiment of the invention, the second through hole 31 is formed in the piezoelectric actuator 200, the connecting sleeve 61 is arranged on the driving block 21, the adjusting tool is inserted into the connecting sleeve 61 through the second through hole 31 to adjust the depth of the right end of the driving rod 22 extending into the driving block 21, and further adjust the distance of the swing rod 5 extending into the valve body 100, so that after the initial installation position of the piezoelectric actuator 200 is adjusted, potential difference is applied to two ends of the piezoelectric ceramic plate 3, the piezoelectric ceramic plate 3 axially extends, the driving block 21 moves leftwards under the axial extension action of the piezoelectric ceramic plate 3, and the leftward movement of the driving block 21 drives the driving rod 22 to move leftwards, so that the swing rod 5 is pushed to move leftwards.

For example, the driving rod 22 and the driving block 21 are connected by screw threads, the connection position of the driving rod 22 and the connecting sleeve 61 is correspondingly set to be an adjusting structure matched with the internal screw threads and the external screw threads, the structure of the screw threads is finer, the adjusting precision is higher, and the adjusting is quick and convenient.

For example, the second through hole 31 is a hexagon socket hole, the adjusting tool is a hexagon socket screw driver or a hexagon socket wrench which is matched with the hexagon socket hole, that is, the left end of the hexagon screw driver is inserted into the connecting sleeve 61 through the second through hole 31, the hexagon socket screw driver is rotated to adjust the position of the driving rod, so as to realize accurate adjustment of the depth of the driving rod 22 extending into the connecting sleeve 61, it is understood that the shape of the second through hole 31 and the adjusting tool can be set into other shapes, such as a hexagon socket hole, a straight slot, a cross slot, an outer hexagon boss and an outer tetragonal boss, and the embodiment of the invention does not limit the shape of the second through hole 31 and the type of the adjusting tool, as long as the rotating torque is matched structure is used to adjust the distance of the right end of the driving rod 22 extending into the connecting sleeve 61.

In some embodiments, the driving part 2 comprises a driving block 21 and a driving rod 22 which are integrally formed, the adjusting assembly 6 is arranged outside the shell 1, the adjusting assembly 6 is connected with the swinging rod 5, and the adjusting assembly 6 is connected with one end of the swinging rod 5 far away from the shell 1, the adjusting assembly 6 comprises an adjusting rod 62, the adjusting rod 62 is arranged in the swinging rod 5 in a penetrating way, the adjusting rod 62 is movable in the length direction of the shell 1, and one end of the adjusting rod 62 is suitable for extending into the valve body 100.

Specifically, the adjusting component 6 is arranged outside the shell 1, the adjusting component 6 is connected with the lower end of the swing rod 5, the left end of the adjusting rod 62 stretches into the valve body 100, the right end of the adjusting rod 62 stretches into the lower end of the swing rod 5, the length of the adjusting rod 62 stretching into the valve body 100 is adjusted by adjusting the depth of the adjusting rod 62 stretching into the swing rod 5, the adjustment of the initial installation position of the piezoelectric actuator 200 is achieved, and the installation efficiency of the piezoelectric actuator 200 is improved.

Optionally, the adjusting component 6 is arranged outside the shell 1, so that the angle between the swing rod 5 and the driving rod 22 can be conveniently adjusted, namely, the depth of the adjusting rod 62 extending into the swing rod 5 can be conveniently adjusted, and when the swing rod 5 is worn, the swing rod 5 can be conveniently replaced.

For example, when the adjusting rod 62 is connected with the swing rod 5 by adopting threads, the depth of the adjusting rod 62 extending into the swing rod 5 can be adjusted by only clamping the wrench to rotate the adjusting rod 62.

In some embodiments, the piezoelectric actuator 200 further includes a first elastic member 7, the first elastic member 7 is disposed in the chamber 11, the driving member 2 is sleeved on the first elastic member 7, one end of the first elastic member 7 abuts against a side of the driving member 2 away from the piezoelectric ceramic sheet 3, and the other end of the first elastic member 7 abuts against an inner wall surface of the housing 1.

Specifically, the left end at cavity 11 is established to first elastic component 7, and first elastic component 7 cover is established on drive part 2, and the left end of first elastic component 7 and the internal face butt of mount pad 8, the right-hand member butt of first elastic component 7 makes drive part 2 closely link to each other with piezoceramics piece 3 through setting up of first elastic component 7, ensures that piezoceramics piece 3 takes place the displacement that axial extension can effectively transmit drive part 2 for drive part 2 drives pendulum rod 5 and rotates around rotation axis 9, and then reduces the energy consumption of piezoceramics actuator 200.

In some embodiments, the distance between the end of the swing link 5 remote from the pivot point and the pivot point is D1, the distance between the abutment of the driving member 2 with the swing link 5 and the pivot point of the swing link 5 is D2, and D1: d2 =1 to 10.

Specifically, by providing the swing link 5 and the rotation shaft 9, the swing link 5 can be rotated around the rotation shaft 9 under the action of the driving lever 22 to increase the stroke of the piezoelectric actuator 200, and by adjusting the distance between the abutment point of the driving lever 22 and the swing link 5 and the pivot point of the swing link 5, the displacement magnification of the swing link 5 can be adjusted.

Alternatively, the pair D1 is based on the difference between the thrust generated by the piezoelectric actuator 200 and the thrust actually required: the ratio of D2 is determined. Namely, the difference between the thrust of the driving rod 22 and the thrust generated by the lower end of the swing rod 5 is combined with the actual thrust pair D1 required by the lower end of the swing rod 5: the ratio of D2 makes the actual determination. When D1: when D2 is smaller than 1, the displacement magnification of the swing rod 5 is too small, and when D1: when D2 is more than 10, the thrust generated by the lower end of the swing rod 5 is too small.

The fluid control valve of the embodiment of the present invention includes a valve body 100, a valve core 110, a piezoelectric actuator 200, and a transmission rod 300.

As shown in fig. 3 and 4, the valve body 100 is provided with the valve body 110, and the valve body 110 is movable in the longitudinal direction of the valve body 100 (the left-right direction as viewed in fig. 3). The piezoelectric actuator 200 is connected to the valve body 100, and the piezoelectric actuator 200 includes the piezoelectric actuator 200 employing any of the above embodiments. One end of the transmission rod 300 is abutted with the swing rod 5, the other end of the transmission rod 300 is abutted with the valve core 110, or one end of the transmission rod 300 is abutted with the adjusting rod 62, and the other end of the transmission rod 300 is abutted with the valve core 110.

Specifically, the valve element 110 is disposed in the valve body 100, the piezoelectric actuator 200 is connected to the valve body 100, and when the adjustment assembly 6 is disposed in the housing 1, the right end of the transmission rod 300 abuts against the left lower end of the swing rod 5, and the left end of the transmission rod 300 abuts against the valve element 110. When the adjusting assembly 6 is disposed outside the housing 1, the right end of the transmission rod 300 is connected to the left end of the adjusting rod 62, and the left end of the transmission rod 300 abuts against the valve core 110.

Alternatively, the piezoelectric actuator 200 and the valve body 100 may be connected by a threaded connection or a flange, and the present invention is not limited to a specific connection manner between the piezoelectric actuator 200 and the valve body 100, so long as a rigid connection between the piezoelectric actuator 200 and the valve body 100 is achieved.

It should be noted that, when a certain gap exists between each part on the transmission path from the driving rod 22 of the piezoelectric actuator 200 to the valve core 110, and when the total length of the gap exceeds the working area of the piezoelectric actuator 200, or when the effective total length of each part on the transmission path is greater than the required length between the piezoelectric actuator 200 and the valve core 110, the initial installation position of the piezoelectric actuator 200 needs to be adjusted when the valve core 110 cannot be in sealed connection with the valve body 100 at the initial position, in the related art, the installation position needs to be adjusted after the piezoelectric actuator 200 is removed as a whole, so that the piezoelectric actuator 200 is frequently installed and the accuracy of adjusting the installation position each time is difficult to ensure.

When the adjusting assembly 6 is located in the housing 1, the second through hole 31 is formed in the piezoelectric ceramic plate 3 of the piezoelectric actuator 200, the connecting sleeve 61 is arranged on the driving block 21, and the adjusting tool is inserted into the second through hole and inserted into the connecting sleeve 61 to adjust the depth of the driving rod 22 extending into the driving block 21, so as to adjust the distance that the left end of the adjusting rod 62 extends into the valve body 100. When the adjusting assembly 6 is positioned outside the shell 1, the adjusting rod 62 is adjusted to extend into the swing rod 5 to adjust the length of the left end of the adjusting rod 62 extending into the valve body 100, so as to realize the adjustment of the initial installation position of the piezoelectric actuator 200.

It should be noted that, the fluid control valve is a two-position two-way switch valve, and in the initial position, the fluid control valve is in a closed state, and the valve core 110 is tightly contacted with the valve body 100 to form a sealing surface to block the liquid port a and the liquid port B, i.e. the working medium cannot flow

When a potential difference is applied to the piezoelectric actuator 200 after the piezoelectric actuator 200 is installed and the installation position is adjusted, the driving rod 22 of the piezoelectric actuator 200 drives the swing rod 5 to move leftwards, the lower end of the swing rod 5 pushes the driving rod 300 to move leftwards, the movement of the driving rod 300 drives the valve core 110 to move leftwards so as to be communicated with the port A and the port B, and working media can be communicated between the port A and the port B, namely, a fluid control valve is opened.

The fluid control valve of the present embodiment of the invention fluid controls the movement of valve element 110 through piezoelectric actuator 200, piezoelectric actuation

Compared with the control modes such as an electromagnet and the like in the related art, the actuator 200 has faster response speed, larger output force and lower power consumption of 0, and the control accuracy of the fluid control valve is improved by controlling the displacement of the valve core 110 through the piezoelectric actuator 200.

Optionally, the fluid control valve further includes a second sealing ring 800, the second sealing ring 800 is sleeved on the transmission rod 300, the second sealing ring 800 is located between the transmission rod 300 and the valve body 100, and the second sealing ring 800 is arranged to enable the transmission rod 300 to form sealing connection with the valve body 100, so that the working efficiency of the fluid control valve is improved.

Alternatively, the valve body 100 includes a valve body, and the valve body 100 and the valve body are integrally formed as one part in the embodiment of the present invention, and it is understood that the valve body 100 and the valve body may be separately provided, i.e., the valve body 100 may be separately provided as one part and the valve

The core 110 seals against both ports a and B.

For example, the transmission rod 300 is a cylindrical shaft, and the transmission rod 300 may be formed in other shapes, so long as the arrangement of receiving the pushing force of the driving rod 22 and transmitting the pushing force to the valve core 110 is within the protection scope of the present invention.

In some embodiments, the valve core is provided with a containing groove, the valve core 110 is provided with a connecting hole 1101, one end 0 of the connecting hole 1101 is connected with the liquid inlet, and the other end of the connecting hole 1101 is communicated with the containing groove. Valve core 110 can be left by providing connecting hole 1101

The balance of the right pressure makes the movement of the valve body 110 smoother.

In some embodiments, the fluid control valve further includes an end cap 500 coupled to the valve body 100 to seal the valve body 100, and a second elastic member 600 abutting the end cap 500 at an end of the second elastic member 600 remote from the valve body 110.

Specifically, the end cap 500 is connected to the valve body 100 to seal the valve body 100, the left end of the second elastic member 600 abuts against the right end of the end cap 5005, the right end of the second elastic member 600 abuts against the left inner wall of the valve core 110, and by the arrangement of the second elastic member 600, the valve core 110 is tightly contacted with the valve body 100 to form a sealing surface to block the liquid port a and the liquid port B, that is, when the second elastic member 600 is in the extended state, the fluid control valve is in the closed state.

For example, the second elastic member 600 is a spring, and the second elastic member 600 may be other members for enabling the fluid control valve to be in

The closed state may be provided, for example, by providing compressed gas or filling an elastic material between the valve element 110 and the end cap 500 to form a sealed connection between the valve element 110 and the valve body 100.

In some embodiments, the control valve further comprises a first sealing ring 400, the first sealing ring 400 is sleeved on the end cover 100, and the first sealing ring 400 is located between the end cover 100 and the valve body 100.

Optionally, a sealing connection is formed between the end cap 100 and the valve body 100 by the provision of the first sealing ring 400.

In some embodiments, the fluid control valve further includes a connection sleeve 700, the piezoelectric actuator 200 is disposed through the connection sleeve 700, and one end of the connection sleeve 700 protrudes into the valve body 100.

The piezoelectric actuator 200 may be connected to the valve body 100 by a flange, or the piezoelectric actuator 200 may be connected to the valve body 100 by a snap-fit connection.

In some embodiments, the fluid control valve further comprises a lock nut 710, the lock nut 710 being sleeved over the connection sleeve 700.

Specifically, the connection sleeve 700 is provided at the right end of the fluid control valve, and the left end portion of the connection sleeve 700 is extended into the valve body 100 to fix the position of the connection sleeve 700, and the piezoelectric actuator 200 is connected to the valve body 100 by fitting the lock nut 710 over the connection sleeve 700.

Optionally, an end face seal, a cone seal, or a ball seal is provided between the valve element 110 and the valve body 100.

When the piezoelectric actuator 200 of the fluid control valve is installed, the piezoelectric actuator 200 is rigidly connected with the valve body 100, the adjusting assembly 6 is used for adjusting the depth of the lower end of the swing rod 5 extending into the valve body 100, the effect of adjusting the initial installation position of the piezoelectric actuator 200 is achieved, the valve core 110 and the valve body 100 are kept in sealing connection, a gap is ensured to be located in the working area of the piezoelectric actuator 200, and the installation efficiency of the fluid control valve is improved.

When the fluid control valve is at the initial position, that is, when the fluid control valve is at the closed state, the valve core 110 is tightly contacted with the valve body 100 under the combined action of the second elastic member 600 and the corresponding hydraulic force to form a sealing surface so as to isolate the liquid port A from the liquid port B.

When a potential difference is applied to the piezoelectric actuator 200, the driving block 21 moves leftwards under the axial extension action of the piezoelectric ceramic plate 3, the left end of the driving rod 22 is abutted against the middle part of the right side of the swinging rod 5 to push the swinging rod 5 to move leftwards, the leftwards movement of the swinging rod 5 drives the swinging rod 5 to rotate leftwards around the rotating shaft 9, the lower end of the swinging rod 5 can generate larger displacement under the leftwards action of the driving rod 22, and then the driving rod 300 and the valve core 110 are pushed to move leftwards, so that the valve core 110 and the valve body 100 are separated, working media can be communicated between an opening A and an opening B, and the hydraulic valve is opened.

When the potential difference of the piezoelectric actuator 200 is removed, the driving rod 22 of the piezoelectric actuator 200 generates a retraction displacement and a pulling force, and pushes the valve core 110 to move rightward under the combined action of the second elastic member 600 and the corresponding hydraulic force, so that the valve core 110 and the valve body 100 are attached again to form a seal, and the driving rod 300 is pushed to move rightward, and returns to the initial position, the working medium cannot communicate between the port a and the port B, and the hydraulic valve is closed.

Alternatively, the expansion and contraction amount of the piezoelectric actuator 200 and the control voltage are in a certain proportional relationship, and the flow and pressure passing through the valve port can be controlled by controlling the magnitude of the potential difference so as to further accurately control the displacement amount of the valve core 110.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims

1. A piezoelectric actuator, comprising:

a housing;

the driving component is arranged in the shell and can move in the length direction of the shell;

the piezoelectric ceramic piece and the cable are arranged in the shell, the piezoelectric ceramic piece is arranged in the cavity, one end of the cable penetrates through the shell to be connected with one end of the piezoelectric ceramic piece, and the other end of the piezoelectric ceramic piece is connected with the driving part;

and one end of the swing rod is pivoted with the shell, the other end of the swing rod can swing, and the swing rod is abutted with the driving part.

2. The piezoelectric actuator of claim 1 further comprising an adjustment assembly for adjusting the depth to which the end of the pendulum rod remote from the housing extends into the valve body.

3. The piezoelectric actuator of claim 2 wherein the drive member comprises a drive block and a drive rod removably connected, the adjustment assembly is disposed within the housing, and the adjustment assembly comprises a connection sleeve disposed through the drive block, the drive rod extending into the connection sleeve, and the depth of the drive rod extending into the connection sleeve is adjustable.

4. The piezoelectric actuator according to claim 2, wherein the driving member comprises a driving block and a driving rod which are integrally formed, the adjusting assembly is arranged outside the housing, the adjusting assembly is connected with the swing rod, the adjusting assembly is connected with one end of the swing rod away from the housing, the adjusting assembly comprises an adjusting rod, the adjusting rod is arranged in the swing rod in a penetrating manner, the adjusting rod is movable in the length direction of the housing, and one end of the adjusting rod is suitable for extending into the valve body.

5. The piezoelectric actuator according to any one of claims 1 to 4, further comprising a first elastic member provided in the chamber, the first elastic member being fitted over the driving member, one end of the first elastic member abutting against a side of the driving member away from the piezoelectric ceramic sheet, and the other end of the first elastic member abutting against an inner wall surface of the housing.

6. The piezoelectric actuator of any one of claims 1-4 wherein the distance between the end of the pendulum rod remote from the pivot point and the pivot point is D1, the distance between the abutment of the drive member with the pendulum rod and the pivot point of the pendulum rod is D2, and D1: d2 =1 to 10.

7. A fluid control valve, comprising:

the valve comprises a valve body and a valve core, wherein the valve core is arranged in the valve body and can move in the length direction of the valve body;

a piezoelectric actuator connected to the valve body, and the piezoelectric actuator is the piezoelectric actuator of any one of claims 1-6;

the transmission rod, the one end of transmission rod with the pendulum rod butt, the other end of transmission rod with the case butt, or, the one end of transmission rod with adjust the pole butt, the other end of transmission rod with the case butt.

8. The fluid control valve of claim 7, wherein the valve core has a receiving groove therein, and the valve core is provided with a connecting hole, one end of the connecting hole is connected to the liquid inlet, and the other end of the connecting hole is communicated with the receiving groove.

9. The fluid control valve of claim 7 further comprising an end cap coupled to the valve body to seal the valve body and a second resilient member abutting the end cap at an end thereof remote from the valve spool.

10. The fluid control valve of claim 9 further comprising a first seal ring sleeved on said end cap, said first seal ring being located between said end cap and said valve body.