Piezoceramic pump and spacecraft

Abstract

This application relates to the field of aerospace technology, specifically to a piezoelectric ceramic pump and spacecraft, comprising a piezoelectric ceramic plate assembly, a first one-way valve diaphragm, a second one-way valve diaphragm, and a body. The body contains an inlet channel, a first liquid chamber, and an outlet channel. The inlet channel is connected to the first liquid chamber via the first one-way valve diaphragm, allowing liquid to flow unidirectionally from the inlet channel into the first liquid chamber. The outlet channel is connected to the first liquid chamber via the second one-way valve diaphragm, allowing liquid to flow unidirectionally from the first liquid chamber into the outlet channel. The body also contains a second liquid chamber, which is connected to the inlet channel. The first and second liquid chambers are separated by the piezoelectric ceramic plate assembly. The purpose of this application is to address at least one technical problem mentioned in the background art by providing a piezoelectric ceramic pump and spacecraft.

Description

Technical Field

[0001] This application relates to the field of aerospace technology, and more specifically, to a piezoelectric ceramic pump and a spacecraft. Background Technology

[0002] Piezoelectric pumps utilize the inverse piezoelectric effect of piezoelectric ceramics to drive fluid flow. They offer advantages such as small size, light weight, and low power consumption, showing broad application prospects in the aerospace field. In space applications, piezoelectric pumps are mainly used in spacecraft thermal control fluid loops and propellant delivery systems. However, the drastic alternation of high and low temperatures in the space environment causes significant fluctuations in the liquid pressure within the loop. Because piezoelectric ceramics are highly sensitive to stress, when a large pressure difference exists across them, the ceramic sheet will bear additional bending stress, leading to a decrease in output performance. Especially under repeated alternating pressure, piezoelectric ceramics are prone to fatigue damage, significantly shortening their service life. This poses a significant reliability risk for spacecraft requiring long-term on-orbit operation. Summary of the Invention

[0003] The purpose of this application is to provide a piezoelectric ceramic pump and a spacecraft that address at least one of the technical problems mentioned in the background art.

[0004] To achieve the above objectives, this application adopts the following technical solution: One aspect of this application provides a piezoelectric ceramic pump, including a piezoelectric ceramic plate assembly, a first one-way valve diaphragm, a second one-way valve diaphragm, and a body. The body is provided with an inlet channel, a first liquid chamber, and an outlet channel. The inlet channel and the first liquid chamber are connected by the first one-way valve diaphragm to allow liquid to enter the first liquid chamber unidirectionally from the inlet channel. The outlet channel and the first liquid chamber are connected by the second one-way valve diaphragm to allow liquid to enter the outlet channel unidirectionally from the first liquid chamber. The body is also provided with a second liquid chamber, which is connected to the inlet channel. The first liquid chamber and the second liquid chamber are separated by the piezoelectric ceramic plate assembly.

[0005] Optionally, the piezoelectric ceramic sheet assembly includes a vibrating metal sheet and a piezoelectric ceramic sheet stacked on top of each other, the piezoelectric ceramic sheet being attached to the vibrating metal sheet, and the first liquid cavity and the second liquid cavity being located on both sides of the piezoelectric ceramic sheet assembly in a first direction, the first direction being perpendicular to the piezoelectric ceramic sheet.

[0006] The beneficial effect of this technical solution is that, by attaching the piezoelectric ceramic sheet to the vibrating metal sheet to form a piezoelectric ceramic sheet assembly, and arranging the first liquid cavity and the second liquid cavity on both sides of the piezoelectric ceramic sheet assembly in a first direction perpendicular to the piezoelectric ceramic sheet, the bending vibration generated by the piezoelectric ceramic sheet assembly under alternating voltage excitation can directly drive the volume of the first liquid cavity to change.

[0007] Optionally, the body includes a pump body portion and a first cover plate stacked and connected to each other in the first direction, and the outer edge of the vibrating metal sheet is fixed between the pump body portion and the first cover plate.

[0008] The beneficial effects of this technical solution are as follows: by stacking and connecting the pump body and the first cover plate in the first direction, and fixing the outer edge of the vibrating metal plate between the pump body and the first cover plate, the periphery of the vibrating metal plate is stably clamped and constrained. This helps to provide clear boundary conditions for the vibrating metal plate when the piezoelectric ceramic plate generates bending vibration, thereby reducing the possibility of unexpected displacement or local deformation of the vibrating metal plate during operation. At the same time, since the outer edge of the vibrating metal plate is clamped between the pump body and the first cover plate, the separation and sealing between the first liquid chamber and the second liquid chamber are enhanced, reducing the risk of liquid leakage between the first liquid chamber and the second liquid chamber, which helps to maintain the stability of the pressure balance on both sides of the piezoelectric ceramic plate assembly, thereby improving the working reliability of the piezoelectric ceramic pump in the extreme environment of space.

[0009] Optionally, the piezoelectric ceramic pump provided in this application further includes a first sealing ring, which is located between the pump body and the first cover plate in the first direction to seal the connection between the pump body and the first cover plate. The piezoelectric ceramic plate assembly, the first liquid chamber, and the second liquid chamber are all located inside the first sealing ring.

[0010] The beneficial effects of this technical solution are as follows: By setting the first sealing ring between the pump body and the first cover plate, and forming a sealed connection between the pump body and the first cover plate, while arranging the piezoelectric ceramic plate assembly, the first liquid chamber, and the second liquid chamber inside the first sealing ring, the area where the piezoelectric ceramic plate assembly, the first liquid chamber, and the second liquid chamber are located is separated from the external environment by the first sealing ring. This reduces the possibility of the external high vacuum environment interfering with the internal pressure balance through the gap between the pump body and the first cover plate, and reduces the risk of leakage of the internal liquid working fluid to the outside. Moreover, since the first sealing ring surrounds the key working components inside, the pressure environment on both sides of the piezoelectric ceramic plate assembly depends more on the internal flow channel than on the external vacuum conditions, thereby helping to maintain the pressure on both sides of the piezoelectric ceramic plate in a state of equilibrium and mitigating the adverse effects of changes in the external environment on the internal pressure stability of the piezoelectric ceramic pump.

[0011] Optionally, the piezoelectric ceramic pump provided in this application further includes a second sealing ring, wherein the first cover plate, the outer edge of the vibrating metal sheet, the second sealing ring and the pump body are stacked sequentially in the first direction, and the second sealing ring and the first sealing ring are coaxially arranged.

[0012] The beneficial effects of this technical solution are as follows: it enables the outer edge of the vibrating metal plate to be stably clamped between the first cover plate and the pump body, while the second sealing ring forms a partial seal on the contact area between the outer edge of the vibrating metal plate and the pump body; moreover, the second sealing ring and the first sealing ring are located on the same axis, and together they form a multi-layer sealing interface distributed radially, thereby reducing the possibility of liquid in the first liquid chamber or the second liquid chamber leaking to the external environment along the outer edge of the vibrating metal plate.

[0013] Optionally, a connecting hole is provided on the pump body, the liquid inlet channel is formed in the pump body, the liquid inlet channel and the second liquid chamber are connected through the connecting hole, and the connecting hole is located between the first sealing ring and the second sealing ring.

[0014] The beneficial effects of this technical solution are as follows: In this way, the connecting hole provides the second liquid chamber with a pressure transmission path that is consistent with the pressure of the liquid inlet channel, so that the pressure reference on both sides of the piezoelectric ceramic sheet assembly originates from the liquid inlet channel; at the same time, since the connecting hole is located between the first sealing ring and the second sealing ring, the first sealing ring and the second sealing ring form multiple sealing barriers around the connecting hole, reducing the possibility of liquid leakage through the periphery of the connecting hole, or the possibility of external vacuum environment interfering with the internal pressure balance through the connecting hole area.

[0015] Optionally, the body is further provided with an inlet buffer chamber connected to the inlet channel and an outlet buffer chamber connected to the outlet channel. The inlet buffer chamber is connected to the first liquid chamber through the first one-way valve diaphragm so that liquid can enter the first liquid chamber unidirectionally from the inlet channel. The outlet buffer chamber is connected to the first liquid chamber through the second one-way valve diaphragm so that liquid can enter the outlet buffer chamber unidirectionally from the first liquid chamber.

[0016] The beneficial effects of this technical solution are as follows: it allows the liquid to flow through the corresponding buffer chamber when entering and exiting the first liquid chamber. The inlet buffer chamber can reduce the direct impact of pressure fluctuations in the inlet flow channel on the opening and closing behavior of the first one-way valve diaphragm. The outlet buffer chamber can also mitigate the pressure fluctuations of the liquid discharged from the first liquid chamber.

[0017] Optionally, the body further includes a second cover plate stacked and fixedly connected to the pump body portion. In the first direction, the first cover plate is located on one side of the pump body portion, and the second cover plate is located on the other side of the pump body portion. The inlet buffer chamber and the outlet buffer chamber are both located between the pump body portion and the second cover plate. In the second direction, the inlet flow channel, the inlet buffer chamber, the outlet buffer chamber, and the outlet flow channel are arranged sequentially. The first direction is perpendicular to the second direction.

[0018] The beneficial effects of this technical solution are as follows: It spatially separates the inlet buffer chamber and the outlet buffer chamber from the piezoelectric ceramic plate assembly located on the other side of the pump body. This separated arrangement reduces the direct transmission path of pressure fluctuations and temperature changes within the inlet and outlet buffer chambers to the piezoelectric ceramic plate assembly. Simultaneously, the fixed connection between the second cover plate and the pump body provides independent sealing boundaries for the inlet and outlet buffer chambers, reducing the risk of liquid leakage in the buffer chamber area and helping to maintain the flow stability of the piezoelectric ceramic pump in the alternating high and low temperature environment of space.

[0019] Optionally, the piezoelectric ceramic pump provided in this application further includes a third sealing ring, which includes an annular portion and a strip portion. The two ends of the strip portion are connected to the two radially opposite ends of the annular portion. The pump body has a separating end for separating the inlet buffer chamber and the outlet buffer chamber. The pump body and the second cover plate are sealed together by the third sealing ring. The strip portion is sealed to the separating end. The inlet buffer chamber and the outlet buffer chamber are both located inside the annular portion.

[0020] The beneficial effects of this technical solution are as follows: the structure of the third sealing ring reduces the need for setting multiple independent sealing elements, and at the same time reduces the possibility of unexpected cross-flow of liquid between the inlet buffer chamber and the outlet buffer chamber; at the same time, the sealing fit between the strip and the dividing end helps to maintain a stable pressure difference between the two buffer chambers, thereby mitigating the adverse effects of mutual pressure interference between the buffer chambers on the pressure balance in the first liquid chamber.

[0021] Another aspect of this application provides a spacecraft including the piezoelectric ceramic pump provided in this application.

[0022] The technical solution provided in this application can achieve at least one of the following beneficial effects: The piezoelectric ceramic pump and spacecraft provided in this application reduce the pressure difference between the two sides of the piezoelectric ceramic plate assembly during the operation of the piezoelectric ceramic pump. This reduces the direct impact of large fluctuations in the circuit liquid pressure caused by the drastic alternation of high and low temperatures in space on the piezoelectric ceramic plate assembly, reduces the additional bending stress borne by the piezoelectric ceramic plate assembly, alleviates the tendency of the piezoelectric ceramic plate assembly to suffer fatigue damage under alternating pressure, helps to extend the service life of the piezoelectric ceramic pump under long-term on-orbit operation conditions, and improves the working reliability of the piezoelectric ceramic pump in the extreme environment of space.

[0023] The additional technical features and advantages of this application will become more apparent from the following description or from practical application. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the specific embodiments of this application, the accompanying drawings used in the description of the specific embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 An exploded structural diagram of one embodiment of the piezoelectric ceramic pump provided in this application; Figure 2 A cross-sectional structural schematic diagram of one embodiment of the piezoelectric ceramic pump provided in this application; Figure 3 This is a cross-sectional structural schematic diagram of one embodiment of the piezoelectric ceramic pump provided in this application, wherein the arrow indicates the direction of liquid flow.

[0026] Figure label: 01. Second cover plate; 02. Third sealing ring; 03. Second one-way valve diaphragm; 04. Pump body; 05. First one-way valve diaphragm; 06. Second sealing ring; 07. First sealing ring; 08. Vibrating metal plate; 9. Piezoelectric ceramic sheet; 10. First cover plate; 11. Strip-shaped section; 12. Liquid inlet channel; 13. Connecting hole; 14. Inlet buffer chamber; 15. Separator end; 16. Outlet buffer chamber; 17. Liquid outlet channel; 18. First liquid chamber; 19. Second liquid cavity; 20. Annular part. Detailed Implementation

[0027] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0030] like Figures 1 to 3As shown, one aspect of this application provides a piezoelectric ceramic pump, including a piezoelectric ceramic plate assembly, a first one-way valve diaphragm 05, a second one-way valve diaphragm 03, and a body. The body is provided with an inlet channel 12, a first liquid chamber 18, and an outlet channel 17. The inlet channel 12 and the first liquid chamber 18 are connected by the first one-way valve diaphragm 05 to allow liquid to enter the first liquid chamber 18 unidirectionally from the inlet channel 12. The outlet channel 17 and the first liquid chamber 18 are connected by the second one-way valve diaphragm 03 to allow liquid to enter the outlet channel 17 unidirectionally from the first liquid chamber 18. The body is also provided with a second liquid chamber 19, which is connected to the inlet channel 12. The first liquid chamber 18 and the second liquid chamber 19 are separated by the piezoelectric ceramic plate assembly.

[0031] Optionally, the piezoelectric ceramic sheet assembly includes a vibrating metal sheet 08 and a piezoelectric ceramic sheet 09 stacked on top of each other. The piezoelectric ceramic sheet 09 is attached to the vibrating metal sheet 08. In a first direction, the first liquid cavity 18 and the second liquid cavity 19 are located on both sides of the piezoelectric ceramic sheet assembly, and the first direction is perpendicular to the piezoelectric ceramic sheet 09. In this way, by attaching the piezoelectric ceramic sheet 09 to the vibrating metal sheet 08 to form the piezoelectric ceramic sheet assembly, and arranging the first liquid cavity 18 and the second liquid cavity 19 on both sides of the piezoelectric ceramic sheet assembly in a first direction perpendicular to the piezoelectric ceramic sheet 09, the bending vibration generated by the piezoelectric ceramic sheet assembly under alternating voltage excitation can directly drive the volume of the first liquid cavity 18 to change.

[0032] Optionally, the body includes a pump body portion 04 and a first cover plate 10 stacked and connected to each other in the first direction, and the outer edge of the vibrating metal plate 08 is fixed between the pump body portion 04 and the first cover plate 10. By stacking and connecting the pump body 04 and the first cover plate 10 in the first direction, and fixing the outer edge of the vibrating metal plate 08 between the pump body 04 and the first cover plate 10, the periphery of the vibrating metal plate 08 is stably clamped and constrained. This provides clear boundary conditions for the vibrating metal plate 08 when the piezoelectric ceramic plate 09 undergoes bending vibration, thereby reducing the possibility of unexpected displacement or local deformation of the vibrating metal plate 08 during operation. At the same time, since the outer edge of the vibrating metal plate 08 is clamped between the pump body 04 and the first cover plate 10, the separation and sealing between the first liquid chamber 18 and the second liquid chamber 19 is enhanced, reducing the risk of liquid leakage between the first liquid chamber 18 and the second liquid chamber 19. This helps maintain the stability of the pressure balance on both sides of the piezoelectric ceramic plate assembly, thereby improving the working reliability of the piezoelectric ceramic pump in the extreme environment of space.

[0033] Optionally, the piezoelectric ceramic pump provided in this application further includes a first sealing ring 07, which is located between the pump body portion 04 and the first cover plate 10 in the first direction to seal the connection between the pump body portion 04 and the first cover plate 10. The piezoelectric ceramic sheet assembly, the first liquid chamber 18 and the second liquid chamber 19 are all located inside the first sealing ring 07. By providing the first sealing ring 07 between the pump body 04 and the first cover plate 10, and forming a sealed connection between the pump body 04 and the first cover plate 10, while arranging the piezoelectric ceramic plate assembly, the first liquid chamber 18, and the second liquid chamber 19 inside the first sealing ring 07, the area where the piezoelectric ceramic plate assembly, the first liquid chamber 18, and the second liquid chamber 19 are located is separated from the external environment by the first sealing ring 07. This reduces the possibility of the external high vacuum environment interfering with the internal pressure balance through the gap between the pump body 04 and the first cover plate 10, and reduces the risk of leakage of the internal liquid working fluid to the outside. Moreover, since the first sealing ring 07 surrounds the key working components inside, the pressure environment on both sides of the piezoelectric ceramic plate assembly depends more on the internal flow channel than on the external vacuum conditions, thereby helping to maintain the pressure on both sides of the piezoelectric ceramic plate 09 tending to be balanced and mitigating the adverse effects of changes in the external environment on the internal pressure stability of the piezoelectric ceramic pump.

[0034] Optionally, the piezoelectric ceramic pump provided in this application further includes a second sealing ring 06. The first cover plate 10, the outer edge of the vibrating metal plate 08, the second sealing ring 06, and the pump body 04 are stacked sequentially in the first direction, with the second sealing ring 06 and the first sealing ring 07 coaxially arranged. This allows the outer edge of the vibrating metal plate 08 to be stably clamped between the first cover plate 10 and the pump body 04. Simultaneously, the second sealing ring 06 forms a partial seal on the contact area between the outer edge of the vibrating metal plate 08 and the pump body 04. Furthermore, the second sealing ring 06 and the first sealing ring 07 are located on the same axis, together forming a radially distributed multi-seal interface, thereby reducing the possibility of liquid in the first liquid chamber 18 or the second liquid chamber 19 leaking to the external environment along the outer edge of the vibrating metal plate 08.

[0035] Optionally, a connecting hole 13 is provided on the pump body 04, and the liquid inlet channel 12 is formed on the pump body 04. The liquid inlet channel 12 and the second liquid chamber 19 are connected through the connecting hole 13, which is located between the first sealing ring 07 and the second sealing ring 06. In this way, the connecting hole 13 provides the second liquid chamber 19 with a pressure transmission path that maintains the same pressure as the liquid inlet channel 12, ensuring that the pressure references on both sides of the piezoelectric ceramic plate assembly originate from the liquid inlet channel 12. Simultaneously, since the connecting hole 13 is located between the first sealing ring 07 and the second sealing ring 06, the first sealing ring 07 and the second sealing ring 06 form multiple sealing barriers around the connecting hole 13, reducing the possibility of liquid leakage through the periphery of the connecting hole 13 or the possibility of external vacuum interfering with the internal pressure balance through the area of ​​the connecting hole 13. Preferably, the liquid outlet channel 17 is formed on the pump body 04.

[0036] Optionally, the body further includes an inlet buffer chamber 14 connected to the inlet channel 12 and an outlet buffer chamber 16 connected to the outlet channel 17. The inlet buffer chamber 14 is connected to the first liquid chamber 18 via a first one-way valve diaphragm 05, allowing liquid to flow unidirectionally from the inlet channel 12 into the first liquid chamber 18. The outlet buffer chamber 16 is connected to the first liquid chamber 18 via a second one-way valve diaphragm 03, allowing liquid to flow unidirectionally from the first liquid chamber 18 into the outlet buffer chamber 16. This ensures that the liquid flows through the corresponding buffer chamber when entering and exiting the first liquid chamber 18. The inlet buffer chamber 14 reduces the direct impact of pressure fluctuations within the inlet channel 12 on the opening and closing behavior of the first one-way valve diaphragm 05, and the outlet buffer chamber 16 similarly mitigates pressure fluctuations in the liquid discharged from the first liquid chamber 18.

[0037] Optionally, the body further includes a second cover plate 01 stacked and fixedly connected to the pump body 04. In the first direction, the first cover plate 10 is located on one side of the pump body 04, and the second cover plate 01 is located on the other side of the pump body 04. The inlet buffer chamber 14 and the outlet buffer chamber 16 are both located between the pump body 04 and the second cover plate 01. In the second direction, the inlet flow channel 12, the inlet buffer chamber 14, the outlet buffer chamber 16, and the outlet flow channel 17 are arranged sequentially, with the first direction perpendicular to the second direction. This spatially separates the inlet buffer chamber 14 and the outlet buffer chamber 16 from the piezoelectric ceramic sheet assembly located on the other side of the pump body 04. This separated arrangement reduces the direct transmission path of pressure fluctuations and temperature changes within the inlet buffer chamber 14 and the outlet buffer chamber 16 to the piezoelectric ceramic sheet assembly. Meanwhile, the fixed connection between the second cover plate 01 and the pump body 04 provides an independent sealing boundary for the inlet buffer chamber 14 and the outlet buffer chamber 16, reducing the risk of liquid leakage in the buffer chamber area and helping to maintain the flow stability of the piezoelectric ceramic pump in the alternating high and low temperature environment of space.

[0038] Optionally, the piezoelectric ceramic pump provided in this application further includes a third sealing ring 02, which includes an annular portion 20 and a strip portion 11. The two ends of the strip portion 11 are connected to the radially opposite ends of the annular portion 20. The pump body portion 04 has a separating end 15 for separating the inlet buffer chamber 14 and the outlet buffer chamber 16. The pump body portion 04 and the second cover plate 01 are sealed together by the third sealing ring 02. The strip portion 11 and the separating end 15 are sealed together. Both the inlet buffer chamber 14 and the outlet buffer chamber 16 are located inside the annular portion 20. The structure of the third sealing ring 02 reduces the need for multiple independent seals and also reduces the possibility of unintended cross-flow of liquid between the inlet buffer chamber 14 and the outlet buffer chamber 16. Simultaneously, the sealing fit between the strip portion 11 and the separating end 15 helps maintain a stable pressure difference between the two buffer chambers, thereby mitigating the adverse effects of pressure interference between the buffer chambers on the pressure balance within the first liquid chamber 18.

[0039] The working process of the piezoelectric ceramic pump provided in this application is as follows: Under alternating voltage excitation, the piezoelectric ceramic sheet 09 drives the vibrating metal sheet 08 to bend and vibrate together, causing the volume of the first liquid chamber 18 to change periodically.

[0040] Intake Stroke: When the piezoelectric ceramic plate assembly bends upward, the volume of the first liquid chamber 18 increases and the pressure decreases. The first one-way valve diaphragm 05 opens under the action of the pressure difference, while the second one-way valve diaphragm 03 remains closed. Liquid flows from the inlet channel 12 through the inlet buffer chamber 14 and the first one-way valve diaphragm 05 into the first liquid chamber 18. At this time, the second liquid chamber 19 remains connected to the inlet channel 12 through the connecting hole 13, and its pressure is always equal to the pressure of the inlet channel 12.

[0041] Discharge Stroke: When the piezoelectric ceramic plate assembly bends downwards, the volume of the first liquid chamber 18 decreases and the pressure increases. The second one-way valve diaphragm 03 opens, and the first one-way valve diaphragm 05 closes. Liquid flows from the first liquid chamber 18 through the second one-way valve diaphragm 03 and the outlet buffer chamber 16 to the outlet flow channel 17. At this time, the second liquid chamber 19 remains connected to the inlet flow channel 12, and the pressure is maintained at the pressure of the inlet flow channel 12.

[0042] Throughout the entire working cycle, one side of the piezoelectric ceramic plate assembly bears the pressure of the first liquid chamber 18, and the other side bears the pressure of the second liquid chamber 19. Since the pressure of the second liquid chamber 19 is always equal to that of the inlet channel 12, while the pressure of the first liquid chamber 18 is equal to that of the inlet channel 12 during the suction stroke and equal to that of the outlet channel 17 during the discharge stroke, the dynamic pressure difference between the two sides of the piezoelectric ceramic plate assembly is extremely small, thereby significantly reducing the risk of bending stress and fatigue damage.

[0043] Another aspect of this application provides a spacecraft including the piezoelectric ceramic pump provided in this application.

[0044] The spacecraft provided in this application utilizes the piezoelectric ceramic pump provided in this application. A second liquid chamber 19, connected to the inlet channel 12, is provided within the spacecraft body. A piezoelectric ceramic plate assembly separates the first liquid chamber 18 from the second liquid chamber 19, such that one side of the piezoelectric ceramic plate assembly bears the pressure within the first liquid chamber 18, and the other side bears the pressure within the second liquid chamber 19. Since the second liquid chamber 19 remains connected to the inlet channel 12, the pressure within the second liquid chamber 19 is the same as the pressure within the inlet channel 12. During the suction stroke, the first liquid chamber 18 is connected to the inlet channel 12 through the first one-way valve diaphragm 05, and its pressure is similar to that of the inlet channel 12. During the discharge stroke, it is connected through the second one-way valve diaphragm... Plate 03 is connected to the liquid outlet channel 17, and its pressure is close to that of the liquid outlet channel 17. The piezoelectric ceramic pump provided in this application reduces the pressure difference between the two sides of the piezoelectric ceramic plate assembly during the operation of the piezoelectric ceramic pump, thereby reducing the direct impact of large fluctuations in the circuit liquid pressure caused by the drastic alternation of high and low temperatures in space (between -100℃ and +100℃) on the piezoelectric ceramic plate assembly, reducing the additional bending stress borne by the piezoelectric ceramic plate assembly, alleviating the tendency of the piezoelectric ceramic plate assembly to undergo fatigue damage under alternating pressure, helping to extend the service life of the piezoelectric ceramic pump under long-term on-orbit operation conditions, and improving the working reliability of the piezoelectric ceramic pump in the extreme environment of space.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A piezoelectric ceramic pump, characterized by, The device includes a piezoelectric ceramic sheet assembly, a first one-way valve diaphragm, a second one-way valve diaphragm, and a body. The body has an inlet channel, a first liquid chamber, and an outlet channel. The inlet channel and the first liquid chamber are connected by the first one-way valve diaphragm to allow liquid to flow unidirectionally from the inlet channel into the first liquid chamber. The outlet channel and the first liquid chamber are connected by the second one-way valve diaphragm to allow liquid to flow unidirectionally from the first liquid chamber into the outlet channel. The body also has a second liquid chamber, which is connected to the inlet channel. The first liquid chamber and the second liquid chamber are separated by the piezoelectric ceramic sheet assembly.

2. The piezoelectric ceramic pump according to claim 1, characterized by The piezoelectric ceramic sheet assembly includes a vibrating metal sheet and a piezoelectric ceramic sheet stacked on top of each other. The piezoelectric ceramic sheet is attached to the vibrating metal sheet. In a first direction, the first liquid cavity and the second liquid cavity are located on both sides of the piezoelectric ceramic sheet assembly, and the first direction is perpendicular to the piezoelectric ceramic sheet.

3. The piezoelectric ceramic pump according to claim 2, characterized by The body includes a pump body portion and a first cover plate stacked and connected to each other in the first direction, and the outer edge of the vibrating metal plate is fixed between the pump body portion and the first cover plate.

4. The piezoelectric ceramic pump according to claim 3, characterized by It also includes a first sealing ring, which is located between the pump body and the first cover plate in the first direction to make a sealed connection between the pump body and the first cover plate. The piezoelectric ceramic plate assembly, the first liquid chamber and the second liquid chamber are all located inside the first sealing ring.

5. The piezoelectric ceramic pump according to claim 4, characterized in that, It also includes a second sealing ring. The first cover plate, the outer edge of the vibrating metal sheet, the second sealing ring and the pump body are stacked in sequence in the first direction, and the second sealing ring and the first sealing ring are coaxially arranged.

6. The piezoelectric ceramic pump according to claim 5, characterized by A connecting hole is provided on the pump body, and the liquid inlet channel is formed on the pump body. The liquid inlet channel and the second liquid chamber are connected through the connecting hole, which is located between the first sealing ring and the second sealing ring.

7. The piezoelectric ceramic pump according to any one of claims 3 to 6, characterized by The body is further provided with an inlet buffer chamber connected to the inlet channel and an outlet buffer chamber connected to the outlet channel. The inlet buffer chamber is connected to the first liquid chamber through the first one-way valve diaphragm so that liquid can enter the first liquid chamber unidirectionally from the inlet channel. The outlet buffer chamber is connected to the first liquid chamber through the second one-way valve diaphragm so that liquid can enter the outlet buffer chamber unidirectionally from the first liquid chamber.

8. The piezoelectric ceramic pump according to claim 7, characterized by The body also includes a second cover plate stacked and fixedly connected to the pump body portion. In the first direction, the first cover plate is located on one side of the pump body portion, and the second cover plate is located on the other side of the pump body portion. The inlet buffer chamber and the outlet buffer chamber are both located between the pump body portion and the second cover plate. In the second direction, the inlet flow channel, the inlet buffer chamber, the outlet buffer chamber and the outlet flow channel are arranged sequentially. The first direction is perpendicular to the second direction.

9. The piezoelectric ceramic pump according to claim 8, characterized by It also includes a third sealing ring, which includes an annular portion and a strip portion. The two ends of the strip portion are connected to the two radially opposite ends of the annular portion. The pump body has a separating end for separating the inlet buffer chamber and the outlet buffer chamber. The pump body and the second cover plate are sealed together by the third sealing ring. The strip portion is sealed to the separating end. The inlet buffer chamber and the outlet buffer chamber are both located inside the annular portion.

10. A spacecraft, characterized in that, Including the piezoelectric ceramic pump as described in any one of claims 1 to 9.

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