Pump structure

Abstract

The embodiment of the utility model discloses a pump structure which comprises a moving assembly and a valve body assembly, the moving assembly comprises a moving body and a supporting piece, and the moving body is arranged on the supporting piece; the valve body assembly is connected with the supporting piece in a sealed mode, and a containing cavity is formed among the moving body, the supporting piece and the valve body assembly. The valve body assembly comprises a valve plate plate, each valve plate is located in one hollow area, one end of each connecting part is connected with the movable part, the other end of each connecting part is connected with the plate body, and the movable part can move in the height direction of the pump structure and open the corresponding valve plate. In the moving process of the movable part, the multiple connecting parts on the periphery of the movable part can apply constraining force to the movable part from different directions so as to guarantee the moving stability of the movable part, distortion, deformation and the like caused by one-way stress of the movable part can be avoided, and therefore the stability and performance consistency of the pump structure can be improved.

Description

Pump structure Technical Field

[0001] This utility model relates to the field of piezoelectric pump technology, and more specifically, to a pump structure. Background Technology

[0002] A piezoelectric pump is a fluid device that utilizes the inverse piezoelectric effect of piezoelectric ceramics, using a piezoelectric oscillator as its actuator. Due to its advantages such as compact structure, high control precision, fast response speed, and long lifespan, it is widely used in fields such as biomedicine, heat dissipation and cooling, and portable testing equipment.

[0003] In existing piezoelectric pump structures, the valve plate section mostly adopts cantilever beam or wheel type. However, the cantilever beam type has poor valve plate sealing performance, and the wheel type valve plate is prone to abnormalities such as twisting due to liquid impact during vibration. Both of these result in poor performance consistency of the piezoelectric pump structure. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a new technical solution for pump structure.

[0005] According to one aspect of the present invention, a pump structure is provided.

[0006] The pump structure includes:

[0007] A motion assembly, comprising a motion body and a support member, wherein the motion body is disposed on the support member;

[0008] A valve body assembly, wherein the valve body assembly is sealed to the support member, and a receiving chamber is formed between the moving body, the support member and the valve body assembly;

[0009] The valve body assembly includes a valve plate, which includes a plate body and two valve plates. Each valve plate includes a movable part and at least two connecting parts. The plate body has two hollow areas, and each valve plate is located in one of the hollow areas. One end of each connecting part is connected to the movable part, and the other end of each connecting part is connected to the plate body. The movable part can move along the height direction of the pump structure and open the corresponding valve plate.

[0010] Optionally, the valve plate includes a plurality of the connecting portions, which are connected to the outer periphery of the movable portion.

[0011] Optionally, the number of connecting parts is four, and the four connecting parts are evenly connected to the outer periphery of the movable part.

[0012] Optionally, the extending direction of the connecting portion forms an acute angle with the axis of symmetry of the valve plate.

[0013] Optionally, the valve body assembly has an inlet and an outlet, the inlet being connected to a first valve plate and the outlet being connected to a second valve plate;

[0014] When the moving body moves away from the support member, the pressure in the receiving chamber decreases. Driven by the pressure difference between the receiving chamber and the outside, the movable part of the first valve plate can move and open the first valve plate. Fluid enters the receiving chamber in sequence along the inlet and the first valve plate, and the second valve plate closes.

[0015] When the moving body moves in the direction close to the support member, the pressure in the receiving chamber increases. Driven by the pressure difference between the receiving chamber and the outside, the movable part of the second valve plate can move and open the second valve plate. The fluid flows out of the receiving chamber along the second valve plate and the outlet in sequence, and the first valve plate closes.

[0016] Optionally, the second valve plate has the same structure as the first valve plate.

[0017] Optionally, the valve body assembly further includes a first pressure plate having a first opening and a second opening, the first opening being opposite to the first valve piece, and the size of the first opening being smaller than the size of the first valve piece, and the second opening being opposite to the second valve piece.

[0018] Optionally, the valve body assembly further includes a second pressure plate, the second pressure plate and the first pressure plate being located on opposite sides of the valve plate, the second pressure plate having a third opening and a fourth opening, the third opening being opposite to the first valve plate, the fourth opening being opposite to the second valve plate, and the size of the fourth opening being smaller than the size of the second valve plate.

[0019] Optionally, the size of the second opening is larger than the size of the second valve plate, and the size of the third opening is larger than the size of the first valve plate.

[0020] Optionally, the valve body assembly further includes a base, which is located on the side of the valve plate away from the moving component, and the base is provided with the water inlet and the water outlet.

[0021] Optionally, the moving body includes a piezoelectric element disposed on the support member. When energized, the piezoelectric element can deform and change the pressure of the accommodating chamber.

[0022] Optionally, the moving body further includes a reinforcing member connected to the side of the piezoelectric element near the support member.

[0023] One technical advantage of the embodiments disclosed herein is that:

[0024] In the pump structure provided by this utility model, during the movement of the movable part, multiple connecting parts on the outer periphery of the movable part can apply constraint forces to the movable part from different directions to ensure the stability of the movable part's movement. This avoids twisting and deformation caused by unidirectional force on the movable part, thereby improving the stability and performance consistency of the pump structure. Furthermore, the arrangement of multiple connecting parts can also improve the structural strength and sensitivity of the valve plate, thereby improving the performance of the pump structure.

[0025] Other features and advantages of the present invention will become clear from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. Attached Figure Description

[0026] The accompanying drawings, which form part of this specification, illustrate embodiments of the present invention and, together with the specification, serve to explain the principles of the present invention.

[0027] Figure 1 is an exploded view of a pump structure according to an embodiment of the present disclosure;

[0028] Figure 2 is a schematic diagram of a valve plate according to an embodiment of the present disclosure;

[0029] Figure 3 is a cross-sectional view of a pump structure according to an embodiment of the present disclosure;

[0030] Figure 4 is another cross-sectional view of a pump structure according to an embodiment of the present disclosure.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Motion component; 11. Motion body; 111. Piezoelectric element; 112. Reinforcing element; 12. Support element; 2. Valve body assembly; 21. Receiving chamber; 22. First valve plate; 221. Movable part; 222. Connecting part; 23. Second valve plate; 24. Inlet; 25. Outlet; 26. Valve plate; 261. Plate body; 262. Hollowed-out area; 27. First pressure plate; 271. First opening; 272. Second opening; 28. Second pressure plate; 281. Third opening; 282. Fourth opening; 29. ​​Base. Detailed Implementation

[0033] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0034] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0035] Technologies and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such technologies and equipment should be considered part of the specification.

[0036] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0037] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0038] This utility model provides a pump structure that serves as a fluid drive device and can be applied in fields such as biomedicine and portable testing equipment.

[0039] As shown in Figures 1 to 4, the pump structure provided in this embodiment of the present invention includes:

[0040] Motion component 1, the motion component 1 includes a motion body 11 and a support member 12, the motion body 11 is disposed on the support member 12;

[0041] Valve body assembly 2, which is sealed to the support member 12, and a receiving chamber 21 is formed between the moving body 11, the support member 12 and the valve body assembly 2;

[0042] The valve body assembly 2 includes a valve plate 26, which includes a plate body 261 and two valve plates. Each valve plate includes a movable part 221 and at least two connecting parts 222. The plate body 261 has two hollow areas 262, and each valve plate is located in one of the hollow areas 262. One end of each connecting part 222 is connected to the movable part 221, and the other end of each connecting part 222 is connected to the plate body 261. The movable part 221 can move along the height direction of the pump structure and open the corresponding valve plate.

[0043] As shown in Figure 1, the moving body 11 may include a piezoelectric element 111, which can deform when energized, thereby generating vibration. The moving body 11 may also include a moving element and a driving element, with the output end of the driving element connected to the moving element, and the driving element used to drive the moving element to move.

[0044] The support member 12 can be made of stainless steel or other metal materials. The support member 12 is designed as a frame structure, which is used to fix and support the moving body 11. The support member 12 has a through hole in the center, allowing the moving body 11 to reciprocate inside it.

[0045] The valve body assembly 2 is sealed to the support member 12. On the one hand, this connects the moving assembly 1 to the valve body assembly 2, facilitating the assembly of the pump structure; on the other hand, it seals the connection between the moving assembly 1 and the valve body assembly 2, forming a sealed receiving chamber 21 between the moving body 11, the support member 12, and the valve body assembly 2, as shown in Figures 3 and 4. When the moving body 11 moves along the height direction of the pump structure, it changes the volume of the receiving chamber 21, thereby changing the pressure within the receiving chamber 21.

[0046] As shown in Figure 2, the valve plate may include a movable part 221 and at least two connecting parts 222. The movable part 221 is located in the hollow area 262, and the multiple connecting parts 222 are uniformly or non-uniformly connected to the outer periphery of the movable part 221 so as to realize the setting of the movable part 221.

[0047] The movable part 221 can be circular, rectangular, or other shapes, and the connecting part 222 is used to connect the movable part 221 and the plate body 261 to realize the assembly of the valve plate. According to the actual design, one, two, three, or even more connecting parts 222 can be set, which can adjust the connection strength of the valve plate accordingly.

[0048] As shown in Figure 3, when the moving body 11 moves away from the support member 12, that is, when the moving body 11 moves upward, the volume of the receiving chamber 21 increases, resulting in a decrease in the pressure of the receiving chamber 21. At this time, the external pressure is greater than the pressure of the receiving chamber 21. Driven by the pressure difference between the receiving chamber 21 and the external pressure, the movable part 221 of the first valve plate 22 can move and open the first valve plate 22, so that the hollow area 262 at the first valve plate 22 is connected to the receiving chamber 21. At this time, the fluid enters the receiving chamber 21 sequentially through the inlet 24 and the first valve plate 22, while the second valve plate 23 is closed, thereby realizing the unidirectional flow of fluid.

[0049] As shown in Figure 4, when the moving body 11 moves in the direction close to the support member 12, that is, when the moving body 11 moves downward, the volume of the receiving chamber 21 decreases, resulting in an increase in the pressure of the receiving chamber 21. At this time, the external pressure is less than the pressure of the receiving chamber 21. Driven by the pressure difference between the receiving chamber 21 and the external pressure, the movable part of the second valve plate 23 can move and open the second valve plate 23, so that the hollow area 262 at the second valve plate 23 is connected to the receiving chamber 21. At this time, the fluid flows out sequentially through the receiving chamber 21, the second valve plate 23 and the outlet 25, while the first valve plate 22 is closed, thereby realizing the unidirectional flow of the fluid.

[0050] In the pump structure provided by this utility model, during the movement of the movable part 221, multiple connecting parts 222 on the outer periphery of the movable part 221 can apply constraint forces to the movable part 221 from different directions to ensure the stability of the movement of the movable part 221. This avoids twisting, deformation, etc., caused by unidirectional force on the movable part 221, thereby improving the stability and performance consistency of the pump structure. Furthermore, the arrangement of multiple connecting parts 222 can also improve the structural strength and sensitivity of the valve plate, thereby improving the performance of the pump structure.

[0051] Optionally, the valve plate includes a plurality of connecting portions 222, which are connected to the outer periphery of the movable portion 221. As shown in FIG2, the arrangement of the plurality of first connecting portions 222 can enhance the connection strength of the valve plate and ensure the reliability of the up-and-down movement of the movable portion 221, preventing the movable portion 221 from tilting, twisting or other abnormalities, thereby ensuring the reliability of the pump structure.

[0052] Optionally, the number of connecting parts 222 is four, and the four connecting parts 222 are evenly connected to the outer periphery of the movable part 221.

[0053] As shown in Figure 2, during the movement of the movable part 221, the four connecting parts 222 on the outer periphery of the movable part 221 can apply constraint forces to the movable part 221 from four directions to ensure the stability of the movement of the movable part 221. This can avoid twisting, deformation, etc. caused by the movable part 221 being subjected to unidirectional force, thereby improving the stability of the pump structure.

[0054] Furthermore, the even arrangement of the four connecting parts 222 can also improve the uniformity of the force on the valve plate, thereby ensuring the smoothness of the movement of the moving part 221.

[0055] Optionally, the extending direction of the connecting portion 222 forms an acute angle with the axis of symmetry of the valve plate 26.

[0056] Specifically, the multiple connecting parts 222 are arranged at an angle, so that during the movement of the movable part 221, the four connecting parts 222 on the outer periphery of the movable part 221 can apply constraint forces to the movable part 221 from four directions to ensure the stability of the movement of the movable part 221. This avoids twisting and deformation caused by unidirectional force on the movable part 221, thereby improving the stability of the pump structure. Furthermore, the angled arrangement of the connecting parts 222 can also increase the opening and closing distance of the valve plate, thereby increasing the output flow of the pump structure.

[0057] Optionally, the valve body assembly 2 has an inlet 24 and an outlet 25, the inlet 24 being connected to the first valve plate 22 and the outlet 25 being connected to the second valve plate 23;

[0058] When the moving body 11 moves away from the support member 12, the pressure in the receiving chamber 21 decreases. Driven by the pressure difference between the receiving chamber 21 and the outside, the movable part 221 of the first valve plate 22 can move and open the first valve plate 22. Fluid enters the receiving chamber 21 in sequence along the inlet 24 and the first valve plate 22, and the second valve plate 23 closes.

[0059] When the moving body 11 moves in a direction close to the support member 12, the pressure in the receiving chamber 21 increases. Driven by the pressure difference between the receiving chamber 21 and the outside, the movable part of the second valve plate 23 can move and open the second valve plate 23. The fluid flows out of the receiving chamber 21 along the second valve plate 23 and the outlet 25 in sequence, and the first valve plate 22 closes.

[0060] As shown in Figure 1, the first valve plate 22 is opposite to and connected to the inlet 24. The first valve plate 22 can be made of elastic materials such as rubber, silicone, or elastic metal. The second valve plate 23 is opposite to and connected to the outlet 25. The second valve plate 23 can also be made of elastic materials such as rubber, silicone, or elastic metal. The inlet 24 and outlet 25 are respectively located on both sides of the valve body assembly 2 for connecting to external pipes to realize the input and output of fluid.

[0061] As shown in Figure 3, when the moving body 11 moves away from the support member 12, that is, when the moving body 11 moves upward, the volume of the receiving chamber 21 increases, causing the pressure in the receiving chamber 21 to decrease. At this time, the external pressure is greater than the pressure in the receiving chamber 21. Driven by the pressure difference between the receiving chamber 21 and the external pressure, the movable part 221 of the first valve plate 22 can move and open the first valve plate 22. At this time, the fluid enters the receiving chamber 21 sequentially through the inlet 24 and the first valve plate 22, while the second valve plate 23 closes, thereby realizing the unidirectional inflow of fluid.

[0062] As shown in Figure 4, when the moving body 11 moves in the direction close to the support member 12, that is, when the moving body 11 moves downward, the volume of the receiving chamber 21 decreases, resulting in an increase in the pressure of the receiving chamber 21. At this time, the external pressure is less than the pressure of the receiving chamber 21. Driven by the pressure difference between the receiving chamber 21 and the external pressure, the movable part of the second valve plate 23 can move and open the second valve plate 23. At this time, the fluid flows out of the receiving chamber 21 sequentially along the second valve plate 23 and the outlet 25, while the first valve plate 22 is closed, thereby realizing the unidirectional flow of fluid.

[0063] Therefore, by utilizing the reciprocating motion of the moving body 11, the pressure can be changed by altering the volume of the receiving chamber 21, creating a pressure difference between the receiving chamber 21 and the outside. This, in turn, drives one of the first valve plate 22 and the second valve plate 23 to open, enabling unidirectional inflow and outflow of fluid, thus achieving the function of the pump structure. This process relies solely on the energy conversion of mechanical motion, requiring no additional electricity or fuel consumption, thereby reducing the energy consumption of the pump structure.

[0064] Compared to traditional pumps, this invention's pump structure has fewer components, and the ingenious design of the connections and fits between these components results in a compact overall structure that is easy to manufacture and maintain. This not only reduces the manufacturing cost of the pump structure but also facilitates improved performance consistency, reliability, and service life.

[0065] Optionally, the second valve plate 23 has the same structure as the first valve plate 22, which facilitates the easy forming of the valve plate 26, thereby reducing the forming difficulty of the pump structure.

[0066] Optionally, the valve body assembly 2 further includes a first pressure plate 27 having a first opening 271 and a second opening 272. The first opening 271 is opposite to the first valve plate 22, and the size of the first opening 271 is smaller than the size of the first valve plate 22. The second opening 272 is opposite to the second valve plate 23.

[0067] As shown in Figure 1, a first opening 271 is positioned opposite to the first valve plate 22, and the size of the first opening 271 is smaller than the size of the first valve plate 22. This allows the first pressure plate 27 to close the first gap within the first valve plate 22, thus shutting off the first valve plate 22 and preventing fluid outflow. A second opening 272 is positioned opposite to the second valve plate 23, and the size of the second opening 272 is larger than the size of the second valve plate 23. This allows the second gap within the second valve plate 23 to connect with the receiving chamber 21, allowing fluid outflow and thus enabling unidirectional fluid flow.

[0068] A first limiting part can be provided on the outer periphery of the first opening 271. The first limiting part includes, but is not limited to, limiting ribs, limiting strips, and limiting protrusions. When the moving body 11 moves in the direction close to the support member 12, since the external pressure is less than the pressure of the receiving chamber 21, the pressure difference between the two allows the first valve plate 22 to circumferentially fit against the first limiting part and seal the first gap inside the first valve plate 22. At this time, the first gap is not connected to the receiving chamber 21, and the fluid cannot flow out. In this way, the unidirectional shut-off of the first valve plate 22 can be guaranteed, and the control requirements for the flatness of the first pressure plate 27 can be reduced, thereby reducing the processing cost of the pump structure. The first pressure plate 27 is mostly made of rigid metal, which can ensure the sealing reliability of the first gap inside the first valve plate 22, thereby ensuring the working reliability of the pump structure.

[0069] Optionally, the valve body assembly 2 further includes a second pressure plate 28, the second pressure plate 28 and the first pressure plate 27 are respectively located on opposite sides of the valve plate 26, the second pressure plate 28 has a third opening 281 and a fourth opening 282, the third opening 281 is opposite to the first valve plate 22, the fourth opening 282 is opposite to the second valve plate 23, and the size of the fourth opening 282 is smaller than the size of the second valve plate 23.

[0070] As shown in Figure 1, the first pressure plate 27 controls the closing of the first valve plate 22 and the opening of the second valve plate 23, and the second pressure plate 28 controls the opening of the first valve plate 22 and the closing of the second valve plate 23. A third opening 281 is provided opposite to the first valve plate 22, and the size of the third opening 281 is larger than the size of the first valve plate 22, so that the first gap inside the first valve plate 22 can be connected to the receiving chamber 21 through the third opening 281, allowing fluid to flow in. A fourth opening 282 is provided opposite to the second valve plate 23, and the size of the fourth opening 282 is smaller than the size of the second valve plate 23, so that the second gap inside the second valve plate 23 can be closed by the second pressure plate 28, and the second valve plate 23 can be closed to prevent fluid from flowing in, thereby enabling unidirectional fluid flow.

[0071] A second limiting part can also be provided on the outer periphery of the fourth opening 282. The second limiting part includes, but is not limited to, limiting ribs, limiting strips, and limiting protrusions. When the moving body 11 moves away from the support member 12, the external pressure is greater than the pressure of the receiving chamber 21. The pressure difference between the two allows the second valve plate 23 to circumferentially fit against the second limiting part and seal the second gap inside the second valve plate 23. At this time, the second gap is not connected to the receiving chamber 21, and fluid cannot flow in. The second pressure plate 28 is mostly made of rigid metal, which can ensure the sealing reliability of the second gap inside the second valve plate 23, thereby ensuring the working reliability of the pump structure.

[0072] Optionally, the size of the second opening 272 is larger than the size of the second valve plate 23, and the size of the third opening 281 is larger than the size of the first valve plate 22, so as to facilitate the smooth flow of fluid through the corresponding gaps.

[0073] Optionally, the valve body assembly 2 further includes a base 29, which is located on the side of the valve plate 26 away from the moving component 1. The base 29 has the inlet 24 and the outlet 25. As shown in Figure 1, the inlet 24 and the outlet 25 are respectively opened on the base 29 for connecting to external pipes to realize the input and output of fluid.

[0074] Optionally, the moving body 11 includes a piezoelectric element 111, which is disposed on the support member 12. When energized, the piezoelectric element 111 can deform and change the pressure of the accommodating chamber 21.

[0075] Specifically, the moving body 11 may include a piezoelectric element 111. When energized, the piezoelectric element 111 can deform, thereby generating vibration. The reciprocating motion of the piezoelectric element 111 can change the pressure by altering the volume of the receiving chamber 21, creating a pressure difference between the receiving chamber 21 and the outside. This drives one of the first valve plate 22 and the second valve plate 23 to open, enabling unidirectional inflow and outflow of fluid, thus realizing the function of the pump structure. Furthermore, using the piezoelectric element 111 as the driving element for fluid flow makes the overall structure of the pump compact, with advantages such as easy miniaturization, easy integration, high control precision, fast response speed, low power consumption, long life, and high reliability.

[0076] Optionally, the moving body 11 further includes a reinforcing member 112, which is connected to the side of the piezoelectric member 111 near the support member 12.

[0077] As shown in Figure 1, the reinforcing member 112 serves to enhance motion, and the piezoelectric element 111 can be connected to the reinforcing member 112 by means of bonding, welding, or other methods. When energized, the piezoelectric element 111 can deform, causing the reinforcing member 112 to move together and changing the pressure in the accommodating chamber 21. The reinforcing member 112 may include a vibrating plate, or it may include both a vibrating plate and a vibrating diaphragm.

[0078] The above embodiments mainly describe the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. For the sake of brevity, they will not be elaborated here.

[0079] While specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A pump structure, characterized in that, include: A motion assembly (1) includes a motion body (11) and a support member (12), the motion body (11) being disposed on the support member (12); a valve body assembly (2) is sealed to the support member (12), and a receiving chamber (21) is formed between the motion body (11), the support member (12), and the valve body assembly (2); the valve body assembly (2) includes a valve plate (26), the valve plate (26) including a plate body (261) and two... Each valve plate includes a movable part (221) and at least two connecting parts (222). The plate body (261) has two hollow areas (262). Each valve plate is located in one of the hollow areas (262). One end of each connecting part (222) is connected to the movable part (221), and the other end of each connecting part (222) is connected to the plate body (261). The movable part (221) can move along the height direction of the pump structure and open the corresponding valve plate.

2. The pump structure according to claim 1, characterized in that, The valve plate includes a plurality of connecting portions (222) which are connected to the outer periphery of the movable portion (221).

3. The pump structure according to claim 2, characterized in that, The number of the connecting parts (222) is four, and the four connecting parts (222) are evenly connected to the outer periphery of the movable part (221).

4. The pump structure according to claim 2, characterized in that, The extension direction of the connecting part (222) forms an acute angle with the axis of symmetry of the valve plate (26).

5. The pump structure according to claim 1, characterized in that, The valve body assembly (2) has an inlet (24) and an outlet (25). The inlet (24) is connected to the first valve plate (22), and the outlet (25) is connected to the second valve plate (23). When the moving body (11) moves away from the support member (12), the pressure in the receiving chamber (21) decreases. Driven by the pressure difference between the receiving chamber (21) and the outside, the movable part (221) of the first valve plate (22) can move and open the first valve plate (22), and the fluid flows sequentially along the inlet (24). When the first valve plate (22) enters the receiving chamber (21), the second valve plate (23) closes; when the moving body (11) moves in the direction close to the support (12), the pressure in the receiving chamber (21) increases. Driven by the pressure difference between the receiving chamber (21) and the outside, the movable part of the second valve plate (23) can move and open the second valve plate (23). The fluid flows out of the receiving chamber (21) along the second valve plate (23) and the outlet (25) in sequence, and the first valve plate (22) closes.

6. The pump structure according to claim 5, characterized in that, The second valve plate (23) has the same structure as the first valve plate (22).

7. The pump structure according to claim 5, characterized in that, The valve body assembly (2) further includes a first pressure plate (27), the first pressure plate (27) having a first opening (271) and a second opening (272), the first opening (271) being opposite to the first valve plate (22), and the size of the first opening (271) being smaller than the size of the first valve plate (22), and the second opening (272) being opposite to the second valve plate (23).

8. The pump structure according to claim 7, characterized in that, The valve body assembly (2) further includes a second pressure plate (28), the second pressure plate (28) and the first pressure plate (27) are respectively located on opposite sides of the valve plate (26), the second pressure plate (28) has a third opening (281) and a fourth opening (282), the third opening (281) is opposite to the first valve plate (22), the fourth opening (282) is opposite to the second valve plate (23), and the size of the fourth opening (282) is smaller than the size of the second valve plate (23).

9. The pump structure according to claim 8, characterized in that, The size of the second opening (272) is larger than the size of the second valve plate (23), and the size of the third opening (281) is larger than the size of the first valve plate (22).

10. The pump structure according to claim 5, characterized in that, The valve body assembly (2) also includes a base (29), which is located on the side of the valve plate (26) away from the moving assembly (1). The base (29) is provided with the inlet (24) and the outlet (25).

11. The pump structure according to claim 1, characterized in that, The moving body (11) includes a piezoelectric element (111) which is disposed on the support (12). When energized, the piezoelectric element (111) can deform and change the pressure of the accommodating chamber (21).

12. The pump structure according to claim 11, characterized in that, The moving body (11) also includes a reinforcing member (112), which is connected to the side of the piezoelectric element (111) near the support member (12).

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