Piezoelectric pump and wearable device

Abstract

The utility model provides a piezoelectric pump and wearable equipment. The pump shell of piezoelectric pump includes at least one accommodation cavity, and is equipped with first air port, second air port and actuating mechanism in each accommodation cavity. Actuating mechanism includes actuator and check valve, and the actuator includes circuit board, piezoelectric ceramic and reset board, and the circuit board sealedly connects the inner wall of accommodation cavity and divides the accommodation cavity into the first cavity that communicates with first air port and the second cavity that communicates with second air port, and the piezoelectric ceramic is connected with circuit board and is laminated on the side of circuit board facing the first cavity, and the reset board is laminated on the side of circuit board facing the second cavity, and the circuit board can drive piezoelectric ceramic to drive actuator to vibrate, and the circuit board is equipped with first through -hole, and the piezoelectric ceramic is equipped with second through -hole communicating with first through -hole, and the check valve is laminated on the side of reset board away from the second cavity and is equipped with gas passage with reset board, and the both ends of gas passage communicate with second cavity and first cavity respectively, and when the actuator vibrates in the direction away from the first cavity, the gas passage is conducted.

Description

Technical Field

[0001] This utility model relates to the field of fluid transport technology, and in particular to a piezoelectric pump and a wearable device. Background Technology

[0002] Piezoelectric pumps are widely used in fluid transport. They rely on the reciprocating vibration of a piezoelectric transducer to provide the driving force for pumping fluid and control the flow direction of the fluid through a one-way valve. However, due to their large size and large amplitude, existing piezoelectric pumps suffer from uneven internal stress distribution in the piezoelectric ceramic sheet during long-term vibration. This can easily lead to cracking of the piezoelectric ceramic sheet, causing it to lose its original function and ultimately resulting in pump failure. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention provides a piezoelectric pump and a wearable device. The piezoelectric pump includes a piezoelectric ceramic with a ring structure, which can reduce the risk of breakage caused by local stress concentration during reciprocating vibration, thereby extending the service life of the piezoelectric pump and improving its performance stability.

[0004] To achieve the above objectives, in a first aspect, embodiments of the present invention provide a piezoelectric pump, including a pump housing and at least one actuating mechanism. The pump housing includes at least one receiving cavity, each receiving cavity having a first air port, a second air port, and the actuating mechanism; each actuating mechanism includes: An actuator includes a circuit board, a piezoelectric ceramic, and a reset plate. The circuit board is sealed to the inner wall of the receiving cavity and divides the receiving cavity into a first cavity and a second cavity. The first cavity is connected to a first air port, and the second cavity is connected to a second air port. The piezoelectric ceramic is electrically connected to the circuit board and is stacked on the side of the circuit board facing the first cavity. The reset plate is stacked on the side of the circuit board facing the second cavity. The circuit board is configured to be powered so that the piezoelectric ceramic drives the actuator to reciprocate. The circuit board has a first through hole in the middle, and the piezoelectric ceramic has a second through hole in the middle that connects to the first through hole. A one-way valve is stacked on the side of the reset plate facing away from the second cavity and has an air passage with the reset plate. One end of the air passage is connected to the second cavity, and the other end of the air passage is connected to the first cavity. When the actuator vibrates in a direction away from the first cavity, the air passage is open; when the actuator vibrates in a direction away from the second cavity, the air passage is closed.

[0005] Secondly, embodiments of the present invention provide a wearable device, including the piezoelectric pump described above.

[0006] Compared with the prior art, the beneficial effects of this utility model are as follows: In the piezoelectric pump and wearable device provided in the embodiments of this utility model, the piezoelectric ceramic of the piezoelectric pump adopts a ring structure, which can reduce the risk of breakage caused by local stress concentration during reciprocating vibration, thereby helping to extend the service life of the piezoelectric pump and improve the performance stability of the piezoelectric pump; furthermore, the one-way valve of the piezoelectric pump is integrated into the actuator, so that the one-way valve can reciprocate axially with the actuator, which helps to improve the response efficiency of the one-way valve, and the integration of the one-way valve into the actuator also helps to reduce the size of the piezoelectric pump, realizing the miniaturization and compact design of the piezoelectric pump.

[0007] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0008] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0009] Figure 1 This is a three-dimensional structural schematic diagram of a piezoelectric pump provided in one embodiment of the present invention.

[0010] Figure 2 yes Figure 1 The diagram shows a three-dimensional structure of the piezoelectric pump from another perspective.

[0011] Figure 3 yes Figure 1 The diagram shows a three-dimensional exploded view of the piezoelectric pump.

[0012] Figure 4 yes Figure 3 The diagram shows a three-dimensional structure of the piezoelectric pump from another perspective.

[0013] Figure 5 yes Figure 1 The image shows a cross-sectional view of the piezoelectric pump.

[0014] Figure 6 yes Figure 5 An enlarged schematic diagram of part A shown.

[0015] Figure 7 yes Figure 1 The diagram shows a half-section three-dimensional structure of the piezoelectric pump after omitting the first housing.

[0016] Figure 8 This is a cross-sectional view of a piezoelectric pump provided in another embodiment of the present invention.

[0017] Explanation of key figure labels: 1-Pump casing; 11-First casing; 12-Second casing; 13-Third casing; 100-Receiving cavity; 101-First air port; 102-Second air port; 103-First cavity; 104-Second cavity; 112-First receiving groove; 113-Air outlet pipe; 115-Protrusion; 117-Filling block; 122-Second receiving groove; 124-Mounting platform; 125-Annular step; 126-Ear; 127-Avoidance notch; 2-Actuation mechanism ; 20-Actuator; 21-Circuit board; 22-Piezoelectric ceramic; 23-Reset plate; 212-First through hole; 214-Electrode terminal; 222-Second through hole; 232-First via hole; 234-Mounting groove; 236-Protrusion; 30-One-way valve; 32-Valve diaphragm; 322-Second via hole; 34-Cover plate; 342-Third via hole; 344-Allowing groove; 326-First positioning groove; 346-Second positioning groove; 1000-Piezoelectric pump.

[0018] The following detailed description, in conjunction with the accompanying drawings, further illustrates this utility model. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "horizontal," "vertical," "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 utility model 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 utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" 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 direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0022] Please combine Figures 1 to 5 This utility model provides a piezoelectric pump 1000, including a pump housing 1 and at least one actuating mechanism 2 disposed within the pump housing 1. Specifically, the pump housing 1 includes at least one receiving cavity 100, each receiving cavity 100 having a first air port 101, a second air port 102, and an actuating mechanism 2; each actuating mechanism 2 includes an actuator 20 and a one-way valve 30. The actuator 20 includes a circuit board 21, a piezoelectric ceramic 22, and a reset plate 23. The edge of the circuit board 21 is sealed to the inner wall of the receiving cavity 100 and divides the receiving cavity 100 into a first cavity 103 and a second cavity 104. The first cavity 103 is connected to the first air port 101, and the second cavity 104 is connected to the second air port 102. The piezoelectric ceramic 22 is electrically connected to the circuit board 21 and is stacked on top of the circuit board. On the side of the circuit board 21 facing the first cavity 103, a reset plate 23 is stacked on the side of the circuit board 21 facing the second cavity 104. The circuit board 21 is configured to be powered on so that the piezoelectric ceramic 22 drives the actuator 20 to reciprocate. A first through hole 212 is formed in the middle of the circuit board 21, and a second through hole 222 connecting the first through hole 212 is formed in the middle of the piezoelectric ceramic 22. A one-way valve 30 is stacked on the side of the reset plate 23 facing away from the second cavity 104 and shares an air passage with the reset plate 23. One end of the air passage connects to the second cavity 104, and the other end connects to the first cavity 103. It should be noted that in this embodiment of the invention, when the actuator 20 vibrates in a direction away from the first cavity 103, the air passage can be open; when the actuator 20 vibrates in a direction away from the second cavity 104, the air passage can be closed. The air passage can have different structural designs, and its specific composition will be explained later, so it will not be elaborated here.

[0023] It is understood that in the piezoelectric pump 1000 provided in the embodiments of this utility model, the reciprocating vibration of the actuator 20 will cause the first cavity 103 and the second cavity 104 to repeatedly expand and contract, resulting in large pressure fluctuations in both the first cavity 103 and the second cavity 104. The first cavity 103 and the second cavity 104 can alternately generate positive and negative pressures. Specifically, the volume changes of the first cavity 103 and the second cavity 104 are opposite, and the pressure fluctuations generated by the first cavity 103 and the second cavity 104 are also exactly opposite. That is, when the air pressure in the first cavity 103 is positive, the air pressure in the second cavity 104 is negative, and when the air pressure in the first cavity 103 is negative, the air pressure in the second cavity 104 is positive. When the actuator 20 vibrates in a direction away from the first cavity 103, the air passage is opened, the volume of the first cavity 103 increases, and the volume of the second cavity 104 decreases. At this time, the air pressure in the first cavity 103 gradually changes to negative pressure, while the air pressure in the second cavity 104 gradually changes to positive pressure, allowing the gas in the second cavity 104 to flow into the first cavity 103 through the opened air passage. When the actuator 20 vibrates in a direction away from the second cavity 104, the air passage is closed, the volume of the first cavity 103 decreases, and the volume of the second cavity 104 increases. At this time, the air pressure in the first cavity 103 gradually turns into positive pressure while the air pressure in the second cavity 104 gradually turns into negative pressure, so that the gas outside the pump housing 1 can flow into the second cavity 104 through the second air port 102, while the gas in the first cavity 103 can only flow out through the first air port 101; in this way, the reciprocating vibration of the actuator 20 can realize the function of unidirectional pumping of gas from the second air port 102 to the first air port 101, wherein the first air port 101 serves as the air outlet of the receiving cavity 100 and the second air port 102 serves as the air inlet of the receiving cavity 100.

[0024] It is also understood that in the piezoelectric pump 1000 provided in the embodiments of this utility model, the piezoelectric ceramic 22 is made into a ring structure by opening a second through hole 222 in the middle of the piezoelectric ceramic 22. Compared with the sheet-like piezoelectric ceramic of the prior art, the ring structure of the piezoelectric ceramic 22 can reduce the risk of breakage caused by local stress concentration during reciprocating vibration, thereby helping to extend the service life of the piezoelectric pump 1000 and improve the performance stability of the piezoelectric pump 1000. Furthermore, the one-way valve 30 is stacked on one side of the reset plate 23 and integrated into the actuator 20, so that the one-way valve 30 can perform axial reciprocating vibration with the actuator 20, which helps to improve the response efficiency of the one-way valve 30. Moreover, the integration of the one-way valve 30 into the actuator 20 also helps to reduce the volume of the piezoelectric pump 1000 and realize the miniaturization and compact design of the piezoelectric pump 1000.

[0025] The following will be combined with the appendix Figure 1 To be continued Figure 8 The piezoelectric pump 1000 provided in the embodiments of this utility model will be described in detail below.

[0026] Please combine again Figures 1 to 5 In one embodiment of this utility model, the pump housing 1 includes a first housing 11 and a second housing 12 mating and connected to the first housing 11. The first housing 11 and the second housing 12 are located at opposite ends of the pump housing 1, and a receiving cavity 100 for accommodating and installing the actuating mechanism 2 is formed between the first housing 11 and the second housing 12. The mating of the first housing 11 and the second housing 12 is not limited to snap-fit ​​connections, threaded connections, etc., and is preferably achieved by using sealant or sealing rings to seal between the first housing 11 and the second housing 12. In this embodiment, the pump housing 1 is composed of two mating housings, which facilitates disassembly and assembly, thereby enabling quick installation of the actuating mechanism 2 into the receiving cavity 100 of the pump housing 1 or replacement of any component in the actuating mechanism 2. The first housing 11 and the second housing 12 may be made of plastic or metal, but this will not be elaborated further.

[0027] Specifically, in Figures 1 to 5 In the example, the first housing 11 is a generally disc-shaped housing with at least one first air port 101 extending through both sides of its axial direction. Preferably, in this embodiment, the first housing 11 is provided with a first air port 101 along the vibration direction of the actuator 20, and the first air port 101 is located on the vibration axis of the actuator 20. By setting the first air port 101 (i.e., the air outlet of the piezoelectric pump 1000) on the vibration axis of the actuator 20, that is, corresponding to the position where the amplitude of the actuator 20 is the largest, the gas discharge volume is the largest and the discharge speed is the fastest, which is beneficial to improving the exhaust speed of the piezoelectric pump 1000. Preferably, in this embodiment, an air outlet pipe 113 communicating with the first air port 101 is provided on the outer side of the first housing 11 (i.e., the side facing away from the second housing 12). By providing an air outlet pipe 113 communicating with the first air port 101 on the outer side of the first housing 11, it is convenient for the piezoelectric pump 1000 to connect to an external device through the air outlet pipe 113, thereby inflating the air storage element of the external device (not limited to the airbag of an airbag massage device). The air outlet pipe 113 can be a straight pipe coaxially arranged with the first air port 101, or a curved pipe communicating with the first air port 101.

[0028] exist Figures 1 to 5In the example, similar to the first housing 11, the second housing 12 is a generally disc-shaped housing with at least one second air port 102 extending through both sides of its axial direction. Preferably, in this embodiment, the second housing 12 is provided with at least two second air ports 102 along the vibration direction of the actuator 20, and the at least two second air ports 102 are located at the vibration nodes of the actuator 20. By placing the second air ports 102 (i.e., the air inlets of the piezoelectric pump 1000) at the vibration nodes of the actuator 20, since the vibration of the actuator 20 at the vibration node position is very small, a large air intake space is left, thus facilitating the entry of external gas into the second cavity 104 through the second air ports 102. Even more preferably, in this embodiment, the at least two second air ports 102 are evenly spaced along the circumference of the second housing 12 to ensure that gas enters the second cavity 104 uniformly.

[0029] Furthermore, in Figures 1 to 5 In the example, the inner peripheral wall of the second housing 12 is provided with an annular step 125, and the inner side of the first housing 11 (the side facing the second housing 12) is provided with a protrusion 115 corresponding to the annular step 125. In this way, the edge of the circuit board 21 of the actuator 20 can be placed on the annular step 125, and then the first housing 11 is mated with the second housing 12 so that the protrusion 115 presses and fixes the edge of the circuit board 21 (see Figure 5 The actuating mechanism 2 is then installed inside the pump housing 1. A sealant (e.g., epoxy adhesive) can be applied between the protrusion 115 and the annular step 125 to bond and fix the first housing 11 and the second housing 12, achieving a seal between them. It can be understood that the cooperation between the protrusion 115 and the annular step 125 also serves as a positioning mechanism, allowing for quick engagement of the first housing 11 and the second housing 12.

[0030] like Figures 3 to 5 As shown, in this embodiment, the internal space of the protrusion 115 forms a first receiving groove 112, and the internal space of the annular step 125 forms a second receiving groove 122. After the first housing 11 and the second housing 12 are engaged, the first receiving groove 112 and the second receiving groove 122 enclose each other to form a large receiving groove for accommodating the other components of the actuation mechanism 2 except for the edge of the circuit board 21 (the middle part of the circuit board 21, the piezoelectric ceramic 22, the reset plate 23, and the one-way valve 30).

[0031] It should be noted that in this embodiment, the edge of the second housing 12 is provided with a clearance notch 127, which is adjacent to the annular step 125. A pair of electrode terminals 214 are connected to the edge of the circuit board 21. When the edge of the circuit board 21 is pressed between the protrusion 115 and the annular step 125, the electrode terminals 214 extend out of the pump housing 1 through the clearance notch 127 to connect to the external power supply. Preferably, in this embodiment, the first housing 11 is provided with a filler block 117 on the outside of the protrusion 115. The shape of the filler block 117 is adapted to the shape of the clearance notch 127. The filler block 117 is configured to fit into the clearance notch 127, thereby pressing the part of the electrode terminal 214 located in the clearance notch 127. Furthermore, the fit of the filler block 117 into the clearance notch 127 also helps to further improve the sealing effect between the first housing 11 and the second housing 12 by the sealant.

[0032] Optionally, in Figures 1 to 5 In the example, a mounting platform 124 can be provided on the outer side of the second housing 12 at a position corresponding to the clearance notch 127. The mounting platform 124 has a limiting groove, and the portion of the electrode terminal 214 extending out of the pump housing 1 is placed in the limiting groove of the mounting platform 124. The mounting platform 124 can support and limit the electrode terminal 214, which helps to improve the reliability of the electrical connection between the electrode terminal 214 and the external power supply. Alternatively, in Figures 1 to 5 In the example, at least one lug 126 is provided on the outer side of the second housing 12. Preferably, there are at least two lugs 126, and the lugs 126 and the mounting platform 124 are distributed at intervals along the circumference of the second housing 12. The lugs 126 are used to fix the second housing 12, for example, but not limited to, opening through holes in the lugs 126 and fixing the second housing 12 by screws inserted through the through holes. This will not be elaborated further.

[0033] It is not difficult to understand that in other embodiments of this utility model, the pump housing 1 may also adopt other structural designs, such as, but not limited to, opening multiple first air ports 101 on the first housing 11 to improve the air output speed of the piezoelectric pump 1000. The specific structure of the pump housing 1 is not limited, as long as the actuation mechanism 2 can be set in the receiving cavity 100 to realize the function of pumping gas.

[0034] Please combine Figures 3 to 6In one embodiment of this utility model, the edge of the circuit board 21 is pressed and fixed between the protrusion 115 of the first housing 11 and the annular step 125 of the second housing 12, thereby dividing the receiving cavity 100 of the pump housing 1 into a first cavity 103 and a second cavity 104. The disc-shaped reset plate 23 and the annular piezoelectric ceramic 22 are respectively stacked on opposite sides of the circuit board 21, and are not limited to being fixed to the circuit board 21 by epoxy adhesive. The side of the circuit board 21 facing the piezoelectric ceramic 22 is provided with two electrodes of opposite polarity, and the side of the piezoelectric ceramic 22 facing the circuit board 21 is also provided with two electrodes of opposite polarity. The two electrodes of the piezoelectric ceramic 22 and the two electrodes of the circuit board 21 are electrically connected one-to-one according to the principle of the same polarity. Thus, when the circuit board 21 is connected to an external power source through the electrode terminal 214, the piezoelectric ceramic 22 can be energized to drive the actuator 20 to drive the one-way valve 30 integrated in the actuator 20 to reciprocate. It should be noted that in the embodiments of this utility model, the circuit board 21 is a sheet-shaped circuit board, preferably a flexible circuit board, to ensure that the circuit board 21 can reciprocate with the piezoelectric ceramic 22; the reset plate 23 can be the reset plate in the existing piezoelectric actuator, which will not be described in detail.

[0035] exist Figures 3 to 6 In the example, the one-way valve 30 is stacked on the side of the reset plate 23 facing the piezoelectric ceramic 22. Specifically, in this embodiment, the one-way valve 30 includes at least a deformable valve diaphragm 32. The shape of the valve diaphragm 32 may be, but is not limited to, a circular valve diaphragm, and it may be, but is not limited to, made of materials such as polyimide (PI) or polyethylene terephthalate (PET).

[0036] The edge of the valve diaphragm 32 can be sealed to the reset plate 23. The reset plate 23 is provided with a first through hole 232 in the middle part of the valve diaphragm 32. The first through hole 232 is connected to the second cavity 104. The valve diaphragm 32 is provided with a second through hole 322. The second through hole 322 is offset from the first through hole 232 and is connected to the second through hole 222. Thus, when the actuator 20 vibrates away from the first cavity 103, under the impact of the gas in the second cavity 104, the middle part of the valve diaphragm 32 deforms away from the reset plate 23. The first through hole 232, the space created by the deformation of the valve diaphragm 32, and the second through hole 322 are connected to form the aforementioned gas passage. At this time, the gas in the second cavity 104 can enter the first cavity 103. When the actuator 20 vibrates away from the second cavity 104, under the impact of the gas in the first cavity 103, the deformed valve diaphragm 32 returns to its natural state and seals the first through hole 232, thereby closing the gas passage. At this time, the gas in the first cavity 103 cannot flow back to the second cavity 104.

[0037] Furthermore, in Figures 3 to 6In the example, the one-way valve 30 also includes a cover plate 34 stacked on the side of the valve diaphragm 32 facing away from the reset plate 23. The cover plate 34 is fixedly connected to the reset plate 23 and pressed against the edge of the valve diaphragm 32. The cover plate 34 has a third through hole 342, which connects to the second through hole 222 and the second through hole 322. The shape of the cover plate 34 is similar to that of the valve diaphragm 32, and the side of the cover plate 34 facing the valve diaphragm 32 has a relief groove 344 at the middle part of the valve diaphragm 32. The relief groove 344 provides deformation space for the middle part of the valve diaphragm 32. In this embodiment, the cover plate 34 is provided to press and fix the edge of the valve diaphragm 32, which can prevent the sealing connection between the valve diaphragm 32 and the reset plate 23 from failing. At the same time, it can limit the size of the deformation of the valve diaphragm 32 and prevent the valve diaphragm 32 from deforming too much and breaking under the impact of strong airflow. Preferably, the depth of the clearance groove 344 along the vibration direction of the actuator 20 is 0.03 mm to 0.05 mm. By limiting the reasonable depth of the clearance groove 344, while ensuring that the valve diaphragm 32 has sufficient deformation space, the cover plate 34 can be prevented from being too thick, thus avoiding an increase in the volume of the one-way valve 30. The cover plate 34 and the reset plate 23 can be fixedly connected by means of, but not limited to, adhesive bonding. When the cover plate 34 and the reset plate 23 are made of metal, they can also be fixed by welding.

[0038] It is understood that, in another embodiment of this utility model, when the one-way valve 30 includes a valve diaphragm 32 and a cover plate 34 stacked on the side of the reset plate 23 facing away from the second cavity 104, the edge of the cover plate 34 can be sealed to the reset plate 23, and a receiving groove is provided on the side of the cover plate 34 facing the reset plate 23 and / or the side of the reset plate 23 facing the cover plate 34. The third through hole 342 on the cover plate 34 connects the second through hole 222 and the receiving groove. The valve diaphragm 32 is located between the cover plate 34 and the reset plate 23 and is movably disposed in the receiving groove. Within the receiving groove; when the actuator 20 vibrates in a direction away from the first cavity 103, under the impact of the gas in the second cavity 104, the valve diaphragm 32 moves in a direction away from the reset plate 23. The first through hole 232, the receiving groove, the second through hole 322, and the third through hole 342 can connect to form the aforementioned air passage; when the actuator 20 vibrates in a direction away from the second cavity 104, under the impact of the gas in the first cavity 103, the valve diaphragm 32 adheres to the reset plate 23 and seals the first through hole 232, thereby closing the air passage. In this embodiment, the valve diaphragm 32 is movably disposed within the receiving groove between the cover plate 34 and the reset plate 23, eliminating the need for a sealed connection to the reset plate 23, which facilitates replacement when the valve diaphragm 32 is damaged.

[0039] Preferably, in Figures 3 to 6In the example, the reset plate 23 has multiple first through holes 232, the valve diaphragm 32 has multiple second through holes 322, and the cover plate 34 has multiple third through holes 342. This design allows the gas passage to have a larger flow area, thereby increasing the gas flow rate. More preferably, the multiple first through holes 232 are concentrated in the middle region of the reset plate 23, the multiple second through holes 322 are concentrated in the middle region of the valve diaphragm 32, and the multiple third through holes 342 are concentrated in the middle region of the cover plate 34. By concentrating multiple through holes on different components in the middle region of the component, the flow channel formed by the interconnection of different through holes can be approximately understood as a straight-line extending and conducting flow channel, and is the same as the vibration axis of the actuator 20, which is more conducive to improving the gas flow rate. Among them, some of the multiple third through holes 342 are coaxially arranged in a one-to-one correspondence with multiple second through holes 322, and another part of the multiple third through holes 342 is coaxially arranged in a one-to-one correspondence with multiple first through holes 232. This design can ensure smooth gas flow when the gas passage is open, and can quickly and evenly press the valve diaphragm 32 onto the reset plate 23 when the actuator 20 vibrates in a direction away from the second cavity 104.

[0040] Optionally, in Figures 3 to 6 In the example, the diameter of the first through-hole 232 is less than or equal to 0.3 mm, and / or the diameter of the second through-hole 322 is less than or equal to 0.3 mm, and / or the diameter of the third through-hole 342 is less than or equal to 0.3 mm. In this embodiment, by limiting the size of different through-holes, it is avoided that any through-hole being too small will cause obstructed gas flow, and any through-hole being too large will cause a large gas flow that could break through the valve diaphragm 32. It is easy to understand that in the embodiment of this utility model, the flow rate and pressure of the pumped gas of the piezoelectric pump 1000 can be adjusted by adjusting the size of the second through-hole 322 on the valve diaphragm 32.

[0041] Alternatively, in Figures 3 to 6 In the example, the thickness of the valve diaphragm 32 is 3 to 5 micrometers. In this embodiment, by limiting the thickness of the valve diaphragm 32, it is possible to avoid the valve diaphragm 32 being too thin and prone to breakage, and to avoid the valve diaphragm 32 being too thick and difficult to deform or move, resulting in low response efficiency.

[0042] Please combine Figure 3 , Figure 6 and Figure 7In one embodiment of this utility model, a mounting groove 234 is preferably provided on the side of the reset plate 23 facing away from the second cavity 104, and at least a portion of the one-way valve 30 (e.g., the valve diaphragm 32 and the portion of the cover plate 34 near the valve diaphragm 32) is accommodated in the mounting groove 234. In this embodiment, by providing a mounting groove on the reset plate 23 to accommodate at least a portion of the one-way valve 30, the overall thickness and volume of the actuation mechanism 2 can be reduced. Optionally, the groove depth of the mounting groove 234 along the vibration direction of the actuator 20 is 0.1 mm. Of course, the groove depth of the mounting groove 234 can also be other values, as long as the basic structural strength of the reset plate 23 is ensured to meet the usage requirements.

[0043] Please combine Figure 3 , Figure 4 and Figure 7 In one embodiment of this utility model, the reset plate 23 preferably has a first positioning structure, and the one-way valve 30 has a second positioning structure. The first positioning structure and the second positioning structure are adapted to each other, thereby enabling the one-way valve 30 to be positioned for assembly, thus quickly stacking the one-way valve 30 on one side of the reset plate 23 and improving the assembly efficiency of the actuation mechanism 2. Specifically, in this embodiment, the first positioning mechanism of the reset plate 23 can be one or more protrusions 236, and the second positioning mechanism of the one-way valve 30 includes one or more first positioning grooves 326 provided on the edge of the valve diaphragm 32, and one or more second positioning grooves 346 provided on the edge of the cover plate 34. The first positioning grooves 326 and the second positioning grooves 346 correspond one-to-one to form a positioning groove for receiving a corresponding protrusion 236. Of course, in other embodiments of this utility model, the first positioning mechanism and the second positioning mechanism can also adopt the cooperation of positioning pins and positioning holes, or other positioning combination mechanisms, which are not limited.

[0044] In the above embodiment, the pump housing 1 has only one receiving cavity 100 and one actuating mechanism 2 disposed within the receiving cavity 100. It is understood that in other embodiments of this invention, the pump housing 1 may also have two or more receiving cavities 100, and each receiving cavity 100 may contain a corresponding actuating mechanism 2, so that the piezoelectric pump 1000 integrates multiple actuators 20. For details, please refer to... Figure 8In another embodiment of the present invention, the pump housing 1 has at least two receiving cavities 100, which are spaced apart along the vibration direction of the actuator 20, and each receiving cavity 100 is provided with an actuation mechanism 2; in each pair of adjacent receiving cavities 100, the first air port 101 of one receiving cavity 100 is connected to the second air port 102 of the other receiving cavity 100. This design allows the piezoelectric pump 1000 to integrate multiple actuation mechanisms 2, and the pressure of the pumped gas generated by the reciprocating vibration of the actuators 20 of the multiple actuation mechanisms 2 can be superimposed, thereby increasing the pressure of the pumped gas of the piezoelectric pump 1000.

[0045] Preferably, in Figure 8 In the example, in each pair of adjacent receiving cavities 100, the first air port 101 of one receiving cavity 100 and the second air port 102 of the connected receiving cavity 100 are coaxially arranged to facilitate smooth gas flow. More preferably, the diameters of the first air port 101 and the connected second air port 102 are the same or smoothly transitioned, that is, the first air port 101 and the second air port 102 are the same through hole, which further facilitates smooth gas flow.

[0046] More specifically, in Figure 8 In the example, the pump housing 1 includes, in addition to a first housing 11 and a second housing 12 located at its axial ends, at least one third housing 13. The third housing 13 is stacked between the first housing 11 and the second housing 12, and each pair of adjacent housings is sealed (e.g., sealed with sealant). This forms at least two receiving cavities 100 spaced apart along the vibration direction of the actuator 20. Each third housing 13 has a through hole extending through its axial ends, which serves as a first air port 101 of one of the two adjacent receiving cavities 100 and a second air port 102 of the other receiving cavity 100. Preferably, as shown in the example... Figure 8 As shown, the through hole on the third housing 13 is located at the vibration node of the actuator 20. This design ensures the efficiency of the piezoelectric pump 1000 in unidirectional gas pumping.

[0047] Of course, in other embodiments of this utility model, the piezoelectric pump 1000, which integrates multiple receiving cavities 100 and multiple actuation mechanisms 2, may also have other structural designs, such as, but not limited to, each third housing 13 having a mounting platform for mounting the portion of the electrode terminal 214 of the receiving circuit board 21 that extends out of the pump housing 1, which will not be elaborated here.

[0048] Furthermore, embodiments of this utility model also provide a wearable device, which includes the piezoelectric pump 1000 of any of the above embodiments. Therefore, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be elaborated further. In embodiments of this utility model, the wearable device can be an eye airbag massager, a head airbag massager, a portable blood pressure monitor, an airbag blood pressure monitoring watch, a negative pressure adsorption massager, or other products with airbag inflation or canister negative pressure suction functions, and is not limited thereto.

[0049] In the description of this utility model, the terms "embodiment," "specific embodiment," "example," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0050] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A piezoelectric pump (1000), characterized in that, The pump housing (1) includes a pump housing (1) and at least one actuating mechanism (2). The pump housing (1) includes at least one receiving cavity (100), each receiving cavity (100) having a first air port (101), a second air port (102), and one of the actuating mechanisms (2). Each actuating mechanism (2) includes: The actuator (20) includes a circuit board (21), a piezoelectric ceramic (22), and a reset plate (23). The circuit board (21) is sealed to the inner wall of the receiving cavity (100) and divides the receiving cavity (100) into a first cavity (103) and a second cavity (104). The first cavity (103) is connected to the first air port (101), and the second cavity (104) is connected to the second air port (102). The piezoelectric ceramic (22) is electrically connected to the circuit board (21) and is stacked. On the side of the circuit board (21) facing the first cavity (103), the reset plate (23) is stacked on the side of the circuit board (21) facing the second cavity (104). The circuit board (21) is configured to be powered on so that the piezoelectric ceramic (22) drives the actuator (20) to reciprocate. The circuit board (21) has a first through hole (212) in the middle, and the piezoelectric ceramic (22) has a second through hole (222) in the middle that connects to the first through hole (212). A one-way valve (30) is stacked on the side of the reset plate (23) facing away from the second cavity (104) and has an air passage with the reset plate (23). One end of the air passage is connected to the second cavity (104) and the other end of the air passage is connected to the first cavity (103). When the actuator (20) vibrates in a direction away from the first cavity (103), the air passage is open. When the actuator (20) vibrates in a direction away from the second cavity (104), the air passage is closed.

2. The piezoelectric pump (1000) as described in claim 1, characterized in that, The one-way valve (30) includes a deformable valve diaphragm (32), the edge of which is sealed to the reset plate (23). The reset plate (23) has a first through hole (232) at the part corresponding to the middle of the valve diaphragm (32), which communicates with the second cavity (104). The valve diaphragm (32) has a second through hole (322), which is offset from the first through hole (232) and communicates with the second through hole (222). When the actuator (20) vibrates in a direction away from the first cavity (103), the middle part of the valve diaphragm (32) deforms in a direction away from the reset plate (23), and the first through hole (232), the space generated by the deformation of the valve diaphragm (32) and the second through hole (322) are connected to form the air passage; when the actuator (20) vibrates in a direction away from the second cavity (104), the valve diaphragm (32) seals the first through hole (232), and the air passage is closed.

3. The piezoelectric pump (1000) as described in claim 2, characterized in that, The one-way valve (30) further includes a cover plate (34) stacked on the side of the valve diaphragm (32) facing away from the reset plate (23). The cover plate (34) is fixedly connected to the reset plate (23) and pressed against the edge of the valve diaphragm (32). The cover plate (34) is provided with a third through hole (342), which connects the second through hole (222) and the second through hole (322). The cover plate (34) facing the valve diaphragm (32) has a relief groove (344) at the part corresponding to the middle of the valve diaphragm (32), and the relief groove (344) provides deformation space for the middle of the valve diaphragm (32).

4. The piezoelectric pump (1000) as described in claim 3, characterized in that, Along the vibration direction of the actuator (20), the groove depth of the clearance groove (344) is 0.03 mm to 0.05 mm.

5. The piezoelectric pump (1000) as described in claim 1, characterized in that, The one-way valve (30) includes a valve diaphragm (32) and a cover plate (34) stacked on the side of the reset plate (23) facing away from the second cavity (104). The valve diaphragm (32) is located between the cover plate (34) and the reset plate (23). The edge of the cover plate (34) is sealed to the reset plate (23). A receiving groove is provided on the side of the cover plate (34) facing the reset plate (23) and / or on the side of the reset plate (23) facing the cover plate (34). The valve diaphragm (32) is movably disposed in the receiving groove. The reset plate (23) is provided with a first through hole (232), which connects the second cavity (104) and the receiving groove. The valve diaphragm (32) is provided with a second through hole (322), which is offset from the first through hole (232). The cover plate (34) is provided with a third through hole (342), which connects the second through hole (222) and the receiving groove. When the actuator (20) vibrates in a direction away from the first cavity (103), the valve diaphragm (32) moves in a direction away from the reset plate (23), and the first through hole (232), the receiving groove, the second through hole (322) and the third through hole (342) are connected to form the air passage; when the actuator (20) vibrates in a direction away from the second cavity (104), the valve diaphragm (32) is attached to the reset plate (23) and seals the first through hole (232), and the air passage is closed.

6. The piezoelectric pump (1000) as described in any one of claims 3 to 5, characterized in that, The reset plate (23) is provided with a plurality of first through holes (232), the valve diaphragm (32) is provided with a plurality of second through holes (322), and the cover plate (34) is provided with a plurality of third through holes (342). Among them, a portion of the plurality of third vias (342) is coaxially arranged in a one-to-one correspondence with a plurality of second vias (322), and another portion of the plurality of third vias (342) is coaxially arranged in a one-to-one correspondence with a plurality of first vias (232).

7. The piezoelectric pump (1000) as described in any one of claims 3 to 5, characterized in that, The diameter of the first via (232) is less than or equal to 0.3 mm, and / or the diameter of the second via (322) is less than or equal to 0.3 mm, and / or the diameter of the third via (342) is less than or equal to 0.3 mm.

8. The piezoelectric pump (1000) as described in any one of claims 2 to 5, characterized in that, The thickness of the valve diaphragm (32) is 3 to 5 micrometers.

9. The piezoelectric pump (1000) according to any one of claims 1 to 5, characterized in that, The reset plate (23) has a mounting groove (234) on the side facing away from the second cavity (104), and at least a portion of the one-way valve (30) is housed in the mounting groove (234).

10. The piezoelectric pump (1000) as claimed in claim 9, characterized in that, Along the vibration direction of the actuator (20), the groove depth of the mounting groove (234) is 0.1 mm.

11. The piezoelectric pump (1000) according to any one of claims 1 to 5, characterized in that, The reset plate (23) is provided with a first positioning structure, and the one-way valve (30) is provided with a second positioning structure. The first positioning structure is adapted to the second positioning structure.

12. The piezoelectric pump (1000) according to any one of claims 1 to 5, characterized in that, The pump housing (1) has at least two of the receiving cavities (100), which are spaced apart along the vibration direction of the actuator (20); In each of two adjacent receiving cavities (100), the first air port (101) of one receiving cavity (100) is connected to the second air port (102) of the other receiving cavity (100).

13. The piezoelectric pump (1000) as described in claim 12, characterized in that, In each pair of adjacent receiving cavities (100), the first air port (101) of one receiving cavity (100) is coaxially arranged with the second air port (102) of the connected receiving cavity (100).

14. The piezoelectric pump (1000) according to any one of claims 1 to 5, characterized in that, Along the vibration direction of the actuator (20), a first air port (101) is provided at one end of the pump housing (1), and the first air port (101) is located on the vibration axis of the actuator (20). And / or, along the vibration direction of the actuator (20), at least two second air ports (102) are provided at the other end of the pump housing (1), the at least two second air ports (102) being located at the vibration nodes of the actuator (20).

15. The piezoelectric pump (1000) according to any one of claims 1 to 5, characterized in that, The pump housing (1) includes a first housing (11) and a second housing (12) connected to the first housing (11). The second housing (12) has a mounting platform (124) on its outer side. The actuator (20) also includes an electrode terminal (214). The portion of the electrode terminal (214) extending out of the pump housing (1) is placed on the mounting platform (124), and one end of the electrode terminal (214) extends into the corresponding receiving cavity (100) and is electrically connected to the circuit board (21) included in the actuator (20). The electrode terminal (214) is used to connect the power supply.

16. A wearable device, characterized in that, Including the piezoelectric pump (1000) as described in any one of claims 1 to 15.

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