Piezoelectric pump and electronic device

Abstract

The utility model discloses a piezoelectric pump and electronic equipment, relates to microfluid delivery technical field, the piezoelectric pump includes valve body subassembly and drive subassembly, the valve body subassembly includes valve seat and two check valve, the valve seat is provided with two mutually independent flow channel, and the two flow channel both penetrate through the opposite surface of valve seat, and the drive subassembly includes the valve seat and two check valve. The two one-way valves are respectively and movably plugged in the two flow channels; the driving assembly is arranged on one surface of the valve seat, a pump cavity is formed in the driving assembly, and the pump cavity penetrates through the surface, facing the valve seat, of the driving assembly and communicates with the two flow channels; the driving assembly vibrates to change the volume of the pump cavity and drive the one-way valve to move, so that fluid flows unidirectionally between the flow channel and the pump cavity; according to the piezoelectric pump, a fluid storage structure, a fluid flow direction control structure and a driving structure are integrated into a whole, the integration level is high, the size of the piezoelectric pump is effectively reduced, the energy consumption of the piezoelectric pump is reduced, and the piezoelectric pump can serve as a conveying element to be applied to the field of consumer electronics.

Description

Technical Field

[0001] The utility model relates to the technical field of microfluid delivery, in particular to a piezoelectric pump and electronic equipment. Background Art

[0002] Piezoelectric pumps are a new type of fluid delivery device that uses the inverse piezoelectric effect of piezoelectric ceramics and uses piezoelectric vibrators as drivers. They are widely used in the fields of biomedicine, heat dissipation, and portable testing equipment. In the field of liquid cooling of consumer electronic products, due to the limitation of the overall space of the product, the delivery element is required to be small in size and low in energy consumption. However, traditional piezoelectric pumps have low integration, large size, and high energy consumption, so they cannot be used as delivery elements in the field of consumer electronic products. Utility Model Content

[0003] The main purpose of the utility model is to provide a piezoelectric pump and an electronic device, aiming to improve the integration of the piezoelectric pump, reduce the size and reduce the energy consumption.

[0004] To achieve the above-mentioned purpose, the utility model proposes a piezoelectric pump, which comprises: a valve body assembly, comprising a valve seat and two one-way valves, wherein the valve seat is provided with two independent flow channels, wherein the two flow channels both penetrate the two opposite surfaces of the valve seat, and the two one-way valves are respectively and movably blocked in the two flow channels; and a drive assembly, which is arranged on one surface of the valve seat and has a pump cavity formed therein, wherein the pump cavity penetrates the surface of the drive assembly facing the valve seat and is connected to the two flow channels; the drive assembly vibrates to change the volume of the pump cavity, thereby driving the one-way valve to move, so that the fluid flows unidirectionally between the flow channel and the pump cavity.

[0005] In one embodiment, a surface of the valve seat facing away from the drive assembly is provided with a flow channel inlet and a flow channel outlet, the flow channel includes a first flow channel and a second flow channel, the flow channel inlet is connected to the first flow channel, and the flow channel outlet is connected to the second flow channel; the one-way valve includes a first one-way valve and a second one-way valve, the first one-way valve is blocked in the first flow channel, and can move in a direction away from the flow channel inlet to allow the fluid in the first flow channel to flow in one direction; the second one-way valve is blocked in the second flow channel, and can move in a direction close to the flow channel outlet to allow the fluid in the second flow channel to flow in one direction.

[0006] In one embodiment, the first one-way valve includes a first main body and a first movable part connected to each other, the first main body is fixed to the valve seat, the first movable part blocks the first flow channel, and can move in a direction away from the flow channel inlet to allow the fluid in the first flow channel to flow in one direction: the second one-way valve includes a second main body and a second movable part connected to each other, the second main body is fixed to the valve seat, the second movable part blocks the second flow channel, and can move in a direction close to the flow channel outlet to allow the fluid in the second flow channel to flow in one direction.

[0007] In one embodiment, the first movable part is disc-shaped, and the surface of the first movable part facing the flow channel inlet is a concave surface, and the end of the first main body away from the flow channel inlet is connected to the middle of the first movable part; the second movable part is disc-shaped, and the surface of the second movable part facing away from the flow channel outlet is a concave surface, and the end of the second main body close to the flow channel outlet is connected to the middle of the second movable part.

[0008] In one embodiment, the material of the first movable part is elastic material, and the material of the second movable part is elastic material; and / or the thickness of the first movable part is in the range of 0.1-0.2 mm, and the thickness of the second movable part is in the range of 0.1-0.2 mm.

[0009] In one embodiment, the valve seat includes a first pressing plate, a fixed plate, a second pressing plate and a bottom plate which are stacked in sequence, the first pressing plate is provided with a first through hole and a second through hole at intervals, the first through hole and the second through hole both penetrate two opposite surfaces of the first pressing plate, and the size of the first through hole is larger than the size of the second through hole; the fixed plate is provided with a third through hole and a fourth through hole at intervals, the third through hole and the fourth through hole both penetrate two opposite surfaces of the fixed plate, and are respectively arranged corresponding to the first through hole and the second through hole; the second pressing plate is provided with a fifth through hole and a sixth through hole at intervals, the fifth through hole and the sixth through hole both penetrate two opposite surfaces of the second pressing plate, and are respectively arranged corresponding to the third through hole and the fourth through hole , and the size of the fifth through hole is smaller than that of the sixth through hole; the bottom plate is provided with the flow channel inlet and the flow channel outlet at intervals, the flow channel inlet and the flow channel outlet both penetrate the two opposite surfaces of the bottom plate, and are respectively arranged corresponding to the fifth through hole and the sixth through hole; the first through hole, the third through hole and the fifth through hole form the first flow channel, and the second through hole, the fourth through hole and the sixth through hole form the second flow channel; the first main body is fixed to the fixed plate, the first movable part is located in the first through hole, and can be movably covered with the third through hole; the second main body is fixed to the fixed plate, the second movable part is located in the sixth through hole, and can be movably covered with the fourth through hole.

[0010] In one embodiment, the third via hole is provided in plurality, and the plurality of the third via holes are provided at intervals along the circumference of the first main body on the outer side of the first main body, and the first movable part can movably cover the plurality of the third via holes; the fourth via hole is provided in plurality, and the plurality of the fourth via holes are provided at intervals along the circumference of the second main body on the outer side of the second main body, and the second movable part can movably cover the plurality of the fourth via holes.

[0011] In one embodiment, the fixing plate is further provided with a first fixing hole and a second fixing hole at intervals, the first fixing hole and the second fixing hole both pass through the two opposite surfaces of the pressure plate, and are respectively arranged adjacent to the third through hole and the fourth through hole; the first main body is provided with a first annular groove, the first annular groove is clamped in the first fixing hole, and the second main body is provided with a second annular groove, the second annular groove is clamped in the second fixing hole.

[0012] In one embodiment, the driving assembly includes a piezoelectric element, a vibration plate and a cover plate which are stacked in sequence, and the surface of the cover plate facing away from the vibration plate is arranged on a surface of the valve seat, and the cover plate is provided with a pump chamber, which passes through two opposite surfaces of the cover plate and connects the two flow channels.

[0013] The utility model also proposes an electronic device, which includes the piezoelectric pump as described above. The technical solution of the utility model is that the piezoelectric pump includes a valve body assembly and a drive assembly, the valve body assembly includes a valve seat and two one-way valves, two independent flow channels are arranged in the valve seat, the two flow channels both penetrate the two opposite surfaces of the valve seat, and the two one-way valves are respectively movably blocked in the two flow channels; the drive assembly is arranged on one surface of the valve seat, and a pump cavity is formed inside, the pump cavity penetrates the surface of the drive assembly facing the valve seat, and is connected to the two flow channels; under the vibration of the drive assembly, the volume of the pump cavity will change and bring about a pressure difference, and at the same time drive the one-way valve to move, thereby driving the fluid to flow unidirectionally between the flow channel and the pump cavity, so as to realize the circulation of the fluid in the piezoelectric pump. The utility model integrates the structure for storing fluid, the structure for controlling the flow direction of the fluid and the drive structure into a whole, with a high degree of integration, effectively reducing the size of the piezoelectric pump, reducing the energy consumption of the piezoelectric pump, and can be used as a conveying element in the field of consumer electronic products. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0015] Figure 1 A cross-sectional structural diagram of an embodiment of a piezoelectric pump provided by the utility model;

[0016] Figure 2 A schematic diagram of the explosion structure of an embodiment of a piezoelectric pump provided by the utility model;

[0017] Figure 3 This is a schematic diagram of the structure of the piezoelectric pump provided by the utility model in the liquid-filled state, wherein the arrow direction on the upper side indicates the vibration direction of the vibration plate, the inner arrow indicates the flow direction of the fluid, and the inner circle indicates the fluid;

[0018] Figure 4 This is a schematic diagram of the structure of the piezoelectric pump provided by the utility model in the liquid discharge state, wherein the arrow direction on the upper side indicates the vibration direction of the vibration plate, the inner arrow indicates the flow direction of the fluid, and the inner circle indicates the fluid;

[0019] Figure 5 for Figure 1 A schematic diagram of the structure of the first one-way valve;

[0020] Figure 6 for Figure 1 Schematic diagram of the structure of the second one-way valve.

[0021] Description of Figure Numbers:

[0022] 100. Piezoelectric pump; 1. Valve seat; 11. First pressure plate; 111. First through hole; 112. Second through hole; 12. Fixing plate; 121. Third through hole; 122. Fourth through hole; 123. First fixing hole; 124. Second fixing hole; 13. Second pressure plate; 131. Fifth through hole; 132. Sixth through hole; 14. Bottom plate; 141. Channel inlet; 142. Channel outlet; 2. First one-way valve; 21. First main body; 211. First annular groove; 22. First movable part; 3. Second one-way valve; 31. Second main body; 311. Second annular groove; 32. First movable part; 4. Driving assembly; 41. Piezoelectric element; 42. Vibrating plate; 43. Cover plate; 431. Pump chamber.

[0023] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0026] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0027] In order to solve the technical problem that the traditional piezoelectric pump has low integration, large size, high energy consumption and therefore cannot be used as a conveying element in the field of consumer electronic products, the utility model proposes a piezoelectric pump 100 .

[0028] See also Figure 1 In one embodiment of the utility model, the piezoelectric pump 100 includes a valve body assembly and a drive assembly 4. The valve body assembly includes a valve seat 1 and two one-way valves. Two independent flow channels are arranged in the valve seat 1. The two flow channels both penetrate the two opposite surfaces of the valve seat 1. The two one-way valves are respectively and movably blocked in the two flow channels; the drive assembly 4 is arranged on one surface of the valve seat 1, and a pump cavity 431 is formed inside. The pump cavity 431 penetrates the surface of the drive assembly 4 facing the valve seat 1 and is connected to the two flow channels; the drive assembly 4 vibrates to change the volume of the pump cavity 431, thereby driving the one-way valve to move, so that the fluid flows unidirectionally between the flow channel and the pump cavity 431.

[0029] Specifically, the valve seat 1 has a first surface and a second surface relative to each other, and two flow channels are arranged inside. Both flow channels penetrate the first surface and the second surface. Two one-way valves are movably arranged to block the two flow channels, that is, the one-way valve has a closed state and an open state. In the closed state, the one-way valve blocks the corresponding flow channel to block the flow of the fluid in the flow channel; in the open state, the one-way valve opens the corresponding flow channel, so that the fluid in the flow channel flows in one direction. The one-way valve can be fully movable or partially movable, as long as it can block or open the corresponding flow channel. The drive component 4 is arranged on the first surface, and a pump chamber 431 is formed inside the drive component 4. The pump chamber 431 penetrates the surface of the drive component 4 facing the first surface and is connected to the two flow channels, that is, the two flow channels are connected through the pump chamber 431. The drive component 4 can change the volume in the pump chamber 431 by vibration, so that there is a pressure difference between the flow channel and the pump chamber 431. Under the action of the pressure difference, the fluid can flow in one direction between the flow channel and the pump chamber 431.

[0030] It should be noted that the unidirectional flow direction of the fluid between one of the flow channels and the pump chamber 431 is opposite to the unidirectional flow direction of the fluid between the other flow channel and the pump chamber 431 to ensure that the fluid can flow in the entire piezoelectric pump 100 .

[0031] The technical solution of the utility model is that the piezoelectric pump 100 includes a valve body assembly and a drive assembly 4. The valve body assembly includes a valve seat 1 and two one-way valves. Two independent flow channels are arranged in the valve seat 1. The two flow channels both penetrate the two opposite surfaces of the valve seat 1. The two one-way valves are respectively movably blocked in the two flow channels; the drive assembly 4 is arranged on one surface of the valve seat 1, and a pump cavity 431 is formed inside, and the pump cavity 431 is connected to the two flow channels; when the drive assembly 4 vibrates, the volume of the pump cavity 431 will change and bring about a pressure difference, and at the same time drive the one-way valve to move, thereby driving the fluid to flow unidirectionally between the flow channel and the pump cavity 431, so as to realize the circulation of the fluid in the piezoelectric pump 100. The utility model integrates the structure for storing fluid, the structure for controlling the flow direction of fluid and the drive structure into a whole, with a high degree of integration, effectively reducing the size of the piezoelectric pump 100, reducing the energy consumption of the piezoelectric pump 100, and can be used as a conveying element in the field of consumer electronic products.

[0032] It should be noted that since two independent flow channels are formed inside the valve seat 1, when the fluid flows in the piezoelectric pump 100, the fluid flows through the pump chamber 431. The volume change generated by the pump chamber 431 can not only drive the fluid flow, but also effectively avoid a large pressure difference in the entire circulation channel, thereby achieving the effect of balancing the pressure and effectively avoiding the occurrence of flow channel vibration.

[0033] See also Figures 1 to 3 A flow channel inlet 141 and a flow channel outlet 142 are provided on the surface of the valve seat 1 facing away from the driving assembly 4. The flow channel includes a first flow channel and a second flow channel. The flow channel inlet 141 is connected to the first flow channel, and the flow channel outlet 142 is connected to the second flow channel. The one-way valve includes a first one-way valve 2 and a second one-way valve 3. The first one-way valve 2 is blocked in the first flow channel and can move in a direction away from the flow channel inlet 141 to allow the fluid in the first flow channel to flow in one direction. The second one-way valve 3 is blocked in the second flow channel and can move in a direction close to the flow channel outlet 142 to allow the fluid in the second flow channel to flow in one direction.

[0034] Specifically, the channel inlet 141 and the channel outlet 142 are arranged at intervals on the second surface, and are respectively connected to the first channel and the second channel; the first one-way valve 2 is located in the first channel, and can move as a whole or partially relative to the first channel to block or open the first channel, and the second one-way valve 3 is located in the second channel, and can move as a whole or partially relative to the second channel to block or open the second channel.

[0035] like Figure 3As shown, when the drive assembly 4 vibrates in a direction away from the valve seat 1 (i.e. upward), the volume of the pump chamber 431 increases, the pressure in the pump chamber 431 decreases, and a pressure difference exists between the pump chamber 431 and the first flow channel. Under the action of the pressure difference, the fluid enters the first flow channel from the flow channel inlet 141, and prompts the first one-way valve 2 to move in a direction away from the flow channel inlet 141, thereby opening the first flow channel, and the fluid entering the first flow channel enters the pump chamber 431. At the same time, there is also a pressure difference between the pump chamber 431 and the second flow channel. Under the action of the pressure difference, the second one-way valve 3 moves in a direction away from the flow channel outlet 142, thereby blocking the second flow channel and preventing the fluid passing through the flow channel outlet 142 from flowing in the second flow channel.

[0036] like Figure 4 As shown, when the driving assembly 4 vibrates in the direction close to the valve seat 1 (i.e. downward), the volume of the pump chamber 431 decreases, the pressure in the pump chamber 431 increases, and there is a pressure difference between the pump chamber 431 and the first flow channel. Under the action of the pressure difference, the fluid enters the second flow channel from the pump chamber 431, and the second one-way valve 3 is prompted to move in the direction close to the flow channel outlet 142, opening the second flow channel, and the fluid entering the second flow channel flows out through the flow channel outlet 142; at the same time, there is also a pressure difference between the pump chamber 431 and the first flow channel. Under the action of the pressure difference, the first one-way valve 2 moves in the direction close to the flow channel inlet 141, blocking the first flow channel, and preventing the fluid in the pump chamber 431 from flowing into the flow channel inlet 141 through the first flow channel. This reciprocating cycle can ensure that the fluid in the selected waterway can circulate in a directional manner.

[0037] It should be noted that the specific structure of the first one-way valve 2 is not limited, as long as it can move in a direction away from the flow channel inlet 141 to allow the fluid in the first flow channel to flow in one direction, or block the first flow channel. The specific structure of the second one-way valve 3 is not limited, as long as it can move in a direction close to the flow channel outlet 142 to allow the fluid in the second flow channel to flow in one direction, or block the second flow channel.

[0038] See also Figure 3 and Figure 5 The first one-way valve 2 includes a first main body 21 and a first movable part 22 connected to each other. The first main body 21 is fixed to the valve seat 1. The first movable part 22 blocks the first flow channel and can move in a direction away from the flow channel inlet 141 to allow the fluid in the first flow channel to flow in one direction.

[0039] See also Figure 3 and Figure 6 The second one-way valve 3 includes a second main body portion 31 and a second movable portion 32 connected to each other. The second main body portion 31 is fixed to the valve seat 1, and the second movable portion 32 blocks the second flow channel and can move toward the direction close to the flow channel outlet 142 to allow the fluid in the second flow channel to flow in one direction.

[0040] Specifically, the first main body 21 and the second main body 31 are both roughly columnar, and their materials can be selected from metal, plastic or silicone rubber. The first movable part 22 and the second movable part 32 are both roughly sheet-shaped and have a certain elasticity, so that they can move to open the corresponding flow channel under the drive of the fluid.

[0041] It should be noted that in order to ensure the overall firmness of the first one-way valve 2 and the second one-way valve 3, the first main body 21 and the first movable part 22 are made of the same material and are an integral structure; the second main body 31 and the second movable part 32 are made of the same material and are an integral structure.

[0042] In an optional embodiment of the present utility model, the first movable part 22 is disc-shaped, and the surface of the first movable part 22 facing the flow channel inlet 141 is a concave surface, and the end of the first main body 21 away from the flow channel inlet 141 is connected to the middle of the first movable part 22; the second movable part 32 is disc-shaped, and the surface of the second movable part 32 facing away from the flow channel outlet 142 is a concave surface, and the end of the second main body 31 close to the flow channel outlet 142 is connected to the middle of the second movable part 32.

[0043] In this embodiment, both the first check valve 2 and the second check valve 3 are mushroom-shaped valve disc structures, and the arrangement directions thereof are opposite, that is, the first check valve 2 is a mushroom-shaped valve disc structure placed in the forward direction, and the second check valve 3 is a mushroom-shaped structure placed in an inverted manner. With such an arrangement, only when the first movable portion 22 of the first check valve 2 moves in a direction away from the flow channel inlet 141 can the fluid in the first flow channel flow in one direction, otherwise the first flow channel is blocked, and only when the second movable portion 32 of the second check valve 3 moves in a direction close to the flow channel outlet 142 can the fluid in the second flow channel flow in one direction, otherwise the second flow channel is blocked.

[0044] Optionally, the first movable part 22 is made of an elastic material, and the second movable part 32 is made of an elastic material. The elastic material may be elastic plastic or silicone rubber, so that the piezoelectric pump 100 can quickly respond to the pressure difference and move, that is, the piezoelectric pump 100 has a faster response speed.

[0045] Optionally, the thickness of the first movable part 22 is in the range of 0.1-0.2 mm, and the thickness of the second movable part 32 is in the range of 0.1-0.2 mm. The first movable part 22 and the second movable part 32 with the above thickness range can be moved in quick response to the pressure difference, that is, the piezoelectric pump 100 has a faster response speed.

[0046] The first one-way valve 2 and the second one-way valve 3 of the utility model have a simple structure and high stability, which can increase the service life of the piezoelectric pump 100. At the same time, the first one-way valve 2 and the second one-way valve 3 both adopt a mushroom-shaped valve plate structure, which can effectively improve the response speed of the piezoelectric pump 100 and increase the delivery flow rate of the piezoelectric pump 100.

[0047] See also Figure 1 and Figure 2 In one embodiment of the utility model, the valve seat 1 includes a first pressing plate 11, a fixing plate 12, a second pressing plate 13 and a bottom plate 14 which are stacked in sequence. The first pressing plate 11 is provided with a first through hole 111 and a second through hole 112 at intervals. The first through hole 111 and the second through hole 112 both penetrate the two opposite surfaces of the first pressing plate 11, and the size of the first through hole 111 is larger than the size of the second through hole 112. The fixing plate 12 is provided with a third through hole 121 and a fourth through hole 122 at intervals. The third through hole 121 and the fourth through hole 122 both penetrate the two opposite surfaces of the fixing plate 12, and are respectively arranged corresponding to the first through hole 111 and the second through hole 112. The second pressing plate 13 is provided with a fifth through hole 131 and a sixth through hole 132 at intervals. The fifth through hole 131 and the sixth through hole 132 both penetrate the two opposite surfaces of the second pressing plate 13, and are respectively arranged corresponding to the first through hole 111 and the second through hole 112. The third through hole 121 and the fourth through hole 122 are arranged correspondingly, and the size of the fifth through hole 131 is smaller than that of the sixth through hole 132; the bottom plate 14 is provided with a flow channel inlet 141 and a flow channel outlet 142 at intervals, and the flow channel inlet 141 and the flow channel outlet 142 both penetrate the two opposite surfaces of the bottom plate 14, and are respectively arranged corresponding to the fifth through hole 131 and the sixth through hole 132; the first through hole 111, the third through hole 121 and the fifth through hole 131 form a first flow channel, and the second through hole 112, the fourth through hole 122 and the sixth through hole 132 form a second flow channel; the first main body 21 is fixed to the fixed plate 12, the first movable part 22 is located in the first through hole 111, and can be movably covered on the third through hole 121; the second main body 31 is fixed to the fixed plate 12, the second movable part 32 is located in the sixth through hole 132, and can be movably covered on the fourth through hole 122.

[0048] Specifically, the materials of the first pressing plate 11, the fixing plate 12, the second pressing plate 13 and the bottom plate 14 can be selected from metal or plastic materials, and are stacked in sequence. The first through hole 111 and the second through hole 112 are both circular holes or elliptical holes, and the first through hole 111 and the second through hole 112 both penetrate the two opposite surfaces of the first pressing plate 11, and the size of the first through hole 111 is larger than the size of the second through hole 112. The size of the first through hole 111 is larger than the size of the first movable part 22, and is used to accommodate the first movable part 22. The size of the second through hole 112 is larger than the first main body 21, and can accommodate an end of the first main body 21 away from the first movable part 22. The third through hole 121 and the fourth through hole 122 are respectively arranged corresponding to the first through hole 111 and the second through hole 112 and are connected, and both penetrate the two opposite surfaces of the fixed plate 12. The shapes of the third through hole 121 and the fourth through hole 122 are not limited, and the size of the third through hole 121 is smaller than the size of the first movable part 22, so that the first movable part 22 can cover the third through hole 121 and thus block the first flow channel. The size of the fourth through hole 122 is smaller than the size of the second movable part 32, so that the second movable part 32 can cover the fourth through hole 122 and thus block the second flow channel. The fifth through hole 131 and the sixth through hole 132 are both circular holes or elliptical holes, which are arranged at intervals on the second pressing plate 13, and correspond to and communicate with the third through hole 121 and the fourth through hole 122 respectively. The size of the fifth through hole 131 is smaller than that of the sixth through hole 132, and the size of the fifth through hole 131 is larger than that of the second main body 31, and is used to accommodate an end of the second main body 31 away from the second movable part 32. The size of the sixth through hole 132 is larger than that of the second movable part 32, and is used to accommodate the second movable part 32. The flow channel inlet 141 and the flow channel outlet 142 are both roughly circular or elliptical, and penetrate the two opposite surfaces of the bottom plate 14. The flow channel inlet 141 corresponds to and communicates with the fifth through hole 131, and the flow channel outlet 142 corresponds to and communicates with the sixth through hole 132. Thus, the first via hole 111 , the third via hole 121 and the fifth via hole 131 together form a first flow channel, the flow channel inlet 141 is connected to the first flow channel, the second via hole 112 , the fourth via hole 122 and the sixth via hole 132 form a second flow channel, and the flow channel outlet 142 is connected to the second flow channel.

[0049] Furthermore, in one embodiment of the utility model, a plurality of third via holes 121 are provided, and the plurality of third via holes 121 are arranged at intervals along the circumference of the first main body portion 21 on the outer side of the first main body portion 21, and the first movable portion 22 can movably cover the plurality of third via holes 121; a plurality of fourth via holes 122 are provided, and the plurality of fourth via holes 122 are arranged at intervals along the circumference of the second main body portion 31 on the outer side of the second main body portion 31, and the second movable portion 32 can movably cover the plurality of fourth via holes 122.

[0050] In this embodiment, a plurality of third via holes 121 are provided, and the plurality of third via holes 121 are uniformly provided on the outer side of the first main body portion 21 along the circumferential direction, and the first movable portion 22 can movably cover the plurality of third via holes 121 to achieve blocking of the first flow channel. When the first movable portion 22 moves in a direction away from the flow channel inlet 141, the first movable portion 22 opens the plurality of third via holes 121, thereby achieving opening of the first flow channel. Such a setting can promote the fluid to flow through the plurality of third via holes 121 in the first flow channel, effectively improving the delivery flow rate of the piezoelectric pump 100. Optionally, the third via hole 121 is in an arc shape to facilitate manufacturing, and the setting is relatively compact, and the fluid flows relatively smoothly.

[0051] It should be noted that, when a plurality of third via holes 121 are provided, the plurality of third via holes 121 , the first via hole 111 and the fifth via hole 131 together form a first flow channel.

[0052] Correspondingly, a plurality of fourth via holes 122 are provided, and the plurality of fourth via holes 122 are uniformly provided on the outer side of the second main body portion 31 along the circumferential direction, and the second movable portion 32 can movably cover the plurality of fourth via holes 122 to achieve blocking of the second flow channel, and when the second movable portion 32 moves toward the direction close to the flow channel outlet 142, the second movable portion 32 opens the plurality of fourth via holes 122, thereby achieving opening of the second flow channel, and such a setting can promote the fluid to flow through the plurality of fourth via holes 122 in the second flow channel, effectively improving the delivery flow of the piezoelectric pump 100. Optionally, the fourth via hole 122 is in an arc shape to facilitate manufacturing, and the setting is relatively compact, and the fluid flows relatively smoothly.

[0053] It should be noted that, when a plurality of fourth via holes 122 are provided, the plurality of fourth via holes 122 , the second via hole 112 and the sixth via hole 132 together form a second flow channel.

[0054] See also Figure 1 , Figure 2 , Figure 5 and Figure 6 In one embodiment of the utility model, the fixing plate 12 is further provided with a first fixing hole 123 and a second fixing hole 124 at intervals, the first fixing hole 123 and the second fixing hole 124 both penetrate the two opposite surfaces of the pressing plate, and are respectively arranged adjacent to the third through hole 121 and the fourth through hole 122; the first main body 21 is provided with a first annular groove 211, the first annular groove 211 is clamped in the first fixing hole 123, and the second main body 31 is provided with a second annular groove 311, the second annular groove 311 is clamped in the second fixing hole 124.

[0055] In this embodiment, the first main body 21 and the second main body 31 are fixed to the fixing plate 12 by means of a snap-fitting method, which makes the fixing operation more convenient and more secure. Optionally, the materials of the first main body 21 and the second main body 31 can both be elastic materials to facilitate assembly and fixing operations.

[0056] It should be noted that when the third via hole 121 and the fourth via hole 122 are both provided in plurality, the plurality of third via holes 121 are evenly arranged outside the first fixing hole 123 , and the plurality of fourth via holes 122 are evenly arranged outside the second fixing hole 124 .

[0057] See also Figures 1 to 4 In one embodiment of the utility model, the driving assembly 4 includes a piezoelectric element 41, a vibration plate 42 and a cover plate 43 which are stacked in sequence. The surface of the cover plate 43 which is away from the vibration plate 42 is arranged on a surface of the valve seat 1. The cover plate 43 is provided with a pump cavity 431. The pump cavity 431 passes through two opposite surfaces of the cover plate 43 and connects two flow channels.

[0058] Specifically, the cover plate 43 is glued to the surface of the first pressing plate 11 facing away from the fixed plate 12, the pump cavity 431 is elliptical, runs through the two opposite surfaces of the cover plate 43, and its size is larger than the size of the first flow channel and the second flow channel, and the first flow channel and the second flow channel are connected through the pump cavity 431. The vibration plate 42 is glued to the surface of the cover plate 43 facing away from the first pressing plate 11 and covers the pump cavity 431, and the piezoelectric element 41 is glued to the surface of the vibration plate 42 facing away from the cover plate 43. The piezoelectric element 41 can be a piezoelectric ceramic, which can produce a reverse electric effect, thereby driving the vibration plate 42 to vibrate, thereby causing the volume of the pump cavity 431 to change.

[0059] Optionally, the piezoelectric element 41 covers the area of ​​the vibration plate 42 corresponding to the pump chamber 431, so as to ensure that the area of ​​the vibration plate 42 corresponding to the pump chamber 431 vibrates so that the volume of the entire pump chamber 431 changes, thereby generating a pressure difference between the flow channel and the pump chamber 431, thereby providing driving force for the flow of the fluid.

[0060] The utility model also provides an electronic device, which includes a piezoelectric pump 100. The specific structure of the piezoelectric pump 100 refers to the above embodiment. Since the electronic device adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. Among them, the electronic device can be a consumer electronic device.

[0061] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A piezoelectric pump, characterized in that: The piezoelectric pump comprises: A valve body assembly, comprising a valve seat and two one-way valves, wherein the valve seat is provided with two independent flow channels, the two flow channels both penetrate two opposite surfaces of the valve seat, and the two one-way valves are respectively and movably blocked in the two flow channels; and A drive assembly is disposed on a surface of the valve seat, and a pump cavity is formed inside the drive assembly. The pump cavity penetrates the surface of the drive assembly facing the valve seat and is connected to the two flow channels. The driving assembly vibrates to change the volume of the pump chamber, driving the one-way valve to move, so that the fluid flows in one direction between the flow channel and the pump chamber.

2. The piezoelectric pump according to claim 1, wherein: The surface of the valve seat facing away from the drive assembly is provided with a flow channel inlet and a flow channel outlet, the flow channel includes a first flow channel and a second flow channel, the flow channel inlet is communicated with the first flow channel, and the flow channel outlet is communicated with the second flow channel; The one-way valve comprises a first one-way valve and a second one-way valve, wherein the first one-way valve blocks the first flow channel and can move in a direction away from the flow channel inlet, so that the fluid in the first flow channel can flow in one direction; The second one-way valve blocks the second flow channel and can move toward a direction close to the flow channel outlet, so that the fluid in the second flow channel can flow in one direction.

3. The piezoelectric pump according to claim 2, characterized in that The first one-way valve comprises a first main body and a first movable part connected to each other, wherein the first main body is fixed to the valve seat, and the first movable part blocks the first flow channel and can move in a direction away from the flow channel inlet, so that the fluid in the first flow channel can flow in one direction. The second one-way valve includes a second main body and a second movable part connected to each other. The second main body is fixed to the valve seat. The second movable part blocks the second flow channel and can move toward a direction close to the flow channel outlet to allow the fluid in the second flow channel to flow in one direction.

4. The piezoelectric pump according to claim 3, wherein: The first movable part is disc-shaped, and the surface of the first movable part facing the flow channel inlet is a concave surface, and one end of the first main body part away from the flow channel inlet is connected to the middle part of the first movable part; The second movable portion is disc-shaped, and a surface of the second movable portion facing away from the flow channel outlet is a concave surface. One end of the second main body portion close to the flow channel outlet is connected to the middle of the second movable portion.

5. The piezoelectric pump according to claim 4, characterized in that The material of the first movable part is elastic material, and the material of the second movable part is elastic material; and / or, The thickness of the first movable part is in the range of 0.1-0.2 mm, and the thickness of the second movable part is in the range of 0.1-0.2 mm.

6. The piezoelectric pump according to claim 3, wherein: The valve seat comprises a first pressing plate, a fixing plate, a second pressing plate and a bottom plate which are stacked in sequence, the first pressing plate is provided with a first through hole and a second through hole at intervals, the first through hole and the second through hole both penetrate two opposite surfaces of the first pressing plate, and the size of the first through hole is larger than the size of the second through hole; The fixing plate is provided with a third through hole and a fourth through hole at intervals, the third through hole and the fourth through hole both penetrate two opposite surfaces of the fixing plate and are respectively provided corresponding to the first through hole and the second through hole; The second pressing plate is provided with a fifth through hole and a sixth through hole at intervals, the fifth through hole and the sixth through hole both penetrate two opposite surfaces of the second pressing plate, and are respectively provided corresponding to the third through hole and the fourth through hole, and the size of the fifth through hole is smaller than the size of the sixth through hole; The bottom plate is provided with the flow channel inlet and the flow channel outlet at intervals, the flow channel inlet and the flow channel outlet both penetrate two opposite surfaces of the bottom plate, and are respectively arranged corresponding to the fifth through hole and the sixth through hole; The first via hole, the third via hole and the fifth via hole form the first flow channel, and the second via hole, the fourth via hole and the sixth via hole form the second flow channel; The first main body is fixed to the fixed plate, and the first movable part is located in the first through hole and can movably cover the third through hole; The second main body is fixed to the fixing plate, and the second movable portion is located in the sixth through hole and can movably cover the fourth through hole.

7. The piezoelectric pump according to claim 6, wherein: The third via holes are provided in plurality, and the plurality of the third via holes are arranged at intervals on the outer side of the first main body along the circumferential direction of the first main body, and the first movable part can movably cover the plurality of the third via holes; The fourth via holes are provided in plurality, and the plurality of the fourth via holes are arranged at intervals along the circumferential direction of the second main body on the outer side of the second main body, and the second movable part can movably cover the plurality of the fourth via holes.

8. The piezoelectric pump according to claim 6, wherein: The fixing plate is also provided with a first fixing hole and a second fixing hole at intervals, the first fixing hole and the second fixing hole both penetrate two opposite surfaces of the pressing plate and are respectively arranged adjacent to the third through hole and the fourth through hole; The first main body is provided with a first annular groove, which is engaged in the first fixing hole, and the second main body is provided with a second annular groove, which is engaged in the second fixing hole.

9. The piezoelectric pump according to any one of claims 1 to 8, characterized in that The driving assembly includes a piezoelectric element, a vibration plate and a cover plate which are stacked in sequence. The surface of the cover plate facing away from the vibration plate is arranged on a surface of the valve seat. The cover plate is provided with a pump cavity which passes through two opposite surfaces of the cover plate and connects the two flow channels.

10. An electronic device, characterized in that: The electronic device comprises the piezoelectric pump according to any one of claims 1 to 9.

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