Piezoelectric pump with check valve and air release valve structure

Abstract

The utility model relates to a piezoelectric pump with a check valve and air release valve structure, which comprises a piezoelectric device and a valve body, the piezoelectric device applies power to the valve body to enable the valve body to work, the valve body is provided with a valve body cavity and an inflating nozzle, the valve body cavity comprises an inflating cavity, an air outlet cavity and a communicating pipe cavity, and the communicating pipe cavity is used for communicating the inflating cavity with the air outlet cavity; the charging connector is communicated with the air outlet cavity; the inflation cavity is provided with a deflation hole column; the diaphragm is arranged on the upper portion of the valve body cavity, covers the valve body cavity and is provided with a check valve hole capable of being communicated with the inflation nozzle, during inflation, pressure enables the diaphragm to be attached downwards, a circulation cavity channel is formed in the upper portion of the diaphragm, the diaphragm covers and seals the deflation hole column, the position of the check valve hole of the diaphragm is downward, and at the moment, the check valve hole is communicated with the inflation nozzle. And the air / fluid is discharged from the charging connector. The piezoelectric pump with the check valve and air release valve structure has the functions of the check valve and the air release valve, and is stable in check and air release and stable in air pressure output.

Description

Technical Field

[0001] The utility model relates to the field of piezoelectric pumps, in particular to a piezoelectric pump with a check valve and an air release valve structure. Background Art

[0002] The rapid development of electronic product technology and the miniaturization of new components are a major development trend of modern electronic equipment. The size of various smart wearable devices, medical, biological, chemical and other equipment are constantly being miniaturized.

[0003] Piezoelectric pumps are new components for fluid transportation in miniaturized electronic devices. They use the reverse piezoelectric effect of piezoelectric vibrators (piezoelectric ceramics) to convert electrical energy into mechanical energy. They have no motors or rotating parts. Piezoelectric vibrators (piezoelectric ceramics) are key components for their power actuation. The vibration plate deforms at high frequency, thereby changing the volume of the pump chamber in the tiny pump body. When the volume of the pump chamber increases, the pressure in the chamber decreases, and the fluid is sucked into the pump chamber. When the volume of the pump chamber decreases, the pressure in the chamber increases, and the fluid is squeezed out through the check valve in the pump body. When the piezoelectric vibrator stops working, the fluid is discharged through the air relief valve.

[0004] Many existing piezoelectric pumps do not have a check valve function or have both a check valve and a deflation valve function. Some of the piezoelectric pumps with a check valve and a deflation valve in the existing market have unstable deflation valves that leak during the inflation process, thereby reducing the air pressure output and ultimately affecting the functionality of the product. Summary of the invention

[0005] In order to overcome the above problems, the utility model provides a piezoelectric pump with a check valve and a gas relief valve structure, which has the functions of the check valve and the gas relief valve, and has stable check and gas relief and stable air pressure output.

[0006] The technical solution adopted by the utility model to solve the technical problem is: a piezoelectric pump with a check valve and a gas relief valve structure, including a piezoelectric device and a valve body, the piezoelectric device applies power to the valve body to make the valve body work, the valve body is provided with a valve body cavity and an air filling nozzle, the valve body cavity includes an air filling cavity, an air outlet cavity and a connecting tube cavity, the connecting tube cavity connects the air filling cavity and the air outlet cavity; the air filling nozzle is connected to the air outlet cavity; the air filling cavity is provided with an air relief hole column;

[0007] A diaphragm is provided on the upper part of the valve body cavity to cover the valve body cavity. The diaphragm is provided with a check valve hole that can be connected to the inflation nozzle. During inflation, the pressure causes the diaphragm to press downward, a flow cavity is formed on the upper part of the diaphragm, and the diaphragm covers and seals the air leakage hole column. The check valve hole of the diaphragm is positioned downward. At this time, the check valve hole is connected to the inflation nozzle, and the gas / fluid is discharged from the inflation nozzle. When inflation stops, the reverse airflow causes the diaphragm to press upward, and the check valve hole of the diaphragm is pressed tightly and closed to a wall of the valve body cavity, which has a check effect. The diaphragm leaves the air leakage hole column. After the air leakage hole column is opened, a flow cavity is formed at the lower part of the diaphragm, and the gas is discharged from the air leakage hole column to complete the deflation.

[0008] Preferably, the air outlet cavity is provided with an isolation bracket, which corresponds to the check valve hole. The isolation bracket stands on the bottom surface of the air outlet cavity. When the diaphragm is pressed downward, the check valve hole of the diaphragm is pressed against the isolation bracket, so that the check valve hole is located in a suspended position, ensuring that the check valve hole is in an open and connected state.

[0009] Preferably, at least one layer of stepped trough is provided at the bottom of the air outlet cavity, and the stepped trough is an inclined surface, which is inclined toward one end from the isolation bracket, and the inflation nozzle is arranged at the bottom end of the inclined surface of the stepped trough.

[0010] Preferably, the valve body cavity is a groove cavity structure arranged on the bottom surface of the valve body.

[0011] Preferably, an air intake plate is provided at the bottom of the piezoelectric device, and the air intake plate forms the upper side surface of the valve body cavity; the air intake plate is designed with an air inlet, the position of the air inlet corresponds to the air leakage hole column, and the air inlet has a avoiding effect.

[0012] Preferably, the diaphragm separates the valve body cavity into an inflation flow channel and an deflation flow channel, and the inflation flow channel is formed by an air inlet, a check valve hole, a valve body cavity, and an inflation nozzle connected in sequence.

[0013] Preferably, the air leakage flow channel is formed by connecting an air filling nozzle, a valve body cavity, and an air leakage hole column in sequence.

[0014] Preferably, the diaphragm is a silicone diaphragm.

[0015] Preferably, the air intake sheet presses the diaphragm tightly, and an adhesive layer is provided between the air intake sheet and the diaphragm, and between the diaphragm and the valve body. The adhesive layer has a vacant area in the middle, which corresponds to the valve body cavity, so that the diaphragm can expand and contract in the valve body cavity.

[0016] Preferably, the piezoelectric device includes, from top to bottom, a heat sink, an air suction cavity, an air suction vibration sheet, a vibration substrate, a piezoelectric ceramic sheet, an electrode assembly, and the air intake sheet; at least one air suction hole is provided on the heat sink; the air suction cavity and the air suction vibration sheet are provided with hollow areas around their edges, the air suction holes correspond to the hollow areas, and the air suction holes, the hollow areas and the hollow gaps of the vibration substrate correspond to each other.

[0017] The beneficial effects of the utility model are: a piezoelectric pump with a check valve and a relief valve structure has stable pressure output, a stable and reliable relief valve, no air leakage, and no problem of unstable relief valve causing air leakage and thus reducing air pressure output, and the product has stable functions. The piezoelectric pump is miniaturized (compact and thin) and has both the check valve and the relief valve functions. The check valve and the relief valve of the piezoelectric pump of this design are detachable integrated modularization. This structural design improves the output gas volume and air pressure stability, and is convenient for detection and quality control before the device is packaged as a finished product. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0019] Figure 1 It is a schematic diagram of the overall structure of the piezoelectric pump with a check valve and a bleed valve structure described in the utility model;

[0020] Figure 2 It is a schematic diagram of the rear structure of the piezoelectric pump with a check valve and a bleed valve structure described in the utility model;

[0021] Figure 3 It is a schematic diagram of the disassembled structure of the piezoelectric pump with a check valve and a bleed valve structure described in the utility model;

[0022] Figure 4 It is a schematic diagram of the cross-sectional structure of the valve body in the utility model;

[0023] Figure 5 It is a simplified schematic diagram of the structure of the valve body in the inflated state of the utility model;

[0024] Figure 6 It is a schematic cross-sectional structure diagram of the valve body in the inflated state of the utility model;

[0025] Figure 7 It is a cross-sectional structural schematic diagram of the valve body in the exhaust state of the utility model;

[0026] Figure 8 It is an exploded view of the piezoelectric pump with a check valve and an air release valve structure described in the utility model.

[0027] Reference numerals:

[0028] 1. Piezoelectric device, 11. Air inlet sheet, 12. Air inlet, 13. Heat sink, 131. Air suction hole, 14. Air suction cavity sheet, 15. Air suction vibration sheet, 16. Vibration substrate, 161. Vibration sheet, 162. Elastic support arm, 17. Piezoelectric ceramic sheet, 18. Electrode assembly, 2. Valve body, 21. Valve body cavity, 211. Inflating cavity, 212. Air outlet cavity, 213. Connecting tube cavity, 22. Inflating nozzle, 23. Air release hole column, 3. Diaphragm, 31. Check valve hole, 4. Isolation bracket, 5. Step sink, 6. Adhesive layer. DETAILED DESCRIPTION

[0029] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0030] like Figure 1-8 The piezoelectric pump with a check valve and a bleed valve structure shown in the figure has a stable bleed valve, no air leakage, and stable air pressure output. There is no problem of unstable bleed valve causing air leakage and thus reducing air pressure output, and the product has stable functions. The piezoelectric pump is miniaturized (compact and thin) and has both the check valve and bleed valve functions. The check valve and bleed valve of the piezoelectric pump of this design are detachable integrated modularization. This structural design improves the output gas volume and air pressure stability, and is convenient for detection and quality control before the device is packaged as a finished product.

[0031] See also Figure 1 , 2 3. The piezoelectric pump comprises a piezoelectric device 1 and a valve body 2. The piezoelectric device 1 works continuously to deliver gas or fluid to the valve body 2.

[0032] The valve body 2 includes a valve body cavity 21 and an inflation nozzle 22. The inflation nozzle 22 is connected to the valve body cavity 21. The piezoelectric device 1 is attached to the valve body cavity 21. One side of the piezoelectric device 1 forms a side surface of the valve body cavity 21. When the piezoelectric device 1 vibrates internally, gas / fluid is transported to the space of the valve body cavity 21, and the gas / fluid in the valve body cavity 21 is squeezed out through the inflation nozzle 22.

[0033] An air intake sheet 11 is disposed at the bottom of the piezoelectric device 1 , and the air intake sheet 11 forms the upper side of the valve body cavity 21 . The air intake sheet 11 is designed with an air inlet 12 , and air / fluid is transported to the space of the valve body cavity 21 through the air inlet 12 .

[0034] See also Figure 3 , 45. The valve body cavity 21 includes an air filling cavity 211 and an air outlet cavity 212. A narrow connecting tube cavity 213 is provided between the air filling cavity 211 and the air outlet cavity 212 to connect the two. In this embodiment, the valve body cavity 21 is a groove cavity structure provided on the inner wall of the valve body 2. The air inlet 12 of the air inlet plate 11 corresponds to the air filling cavity 211. The position of the air filling cavity 211 corresponding to the air inlet 12 is provided with an air leakage hole column 23. When inflating, refer to Figure 5 , 6 , the air leakage hole column 23 is in a closed state.

[0035] Among them, a layer of diaphragm 3 is arranged on the upper part of the valve body cavity 21, and the diaphragm 3 is between the valve body cavity 21 and the air inlet sheet 11, covering the valve body cavity 21, and the diaphragm 3 is provided with a check valve hole 31, and the check valve hole 31 can be connected to the inflation nozzle 22; during inflation, the pressure makes the diaphragm 3 pressed downward, and the diaphragm 3 covers the air leakage hole column 23 tightly, and the check valve hole 31 of the diaphragm 3 is positioned downward, at this time, the check valve hole 31 is connected to the inflation nozzle 22, and the gas / fluid is discharged from the inflation nozzle 22. At this time, during the inflation process, the circulation position of the gas / fluid is at the upper part of the diaphragm 3.

[0036] When the inflation stops, the reverse airflow makes the diaphragm 3 press upward, and the check valve hole 31 of the diaphragm 3 is tightly closed against the upper wall of the air inlet sheet 11, which has a check effect. In addition, the reverse airflow makes the diaphragm 3 leave the air leakage hole column 23, and the diaphragm 3 presses upward against the air inlet 12 of the air inlet sheet 11, closing the air inlet 12, and the airflow is closed under the diaphragm 3. When exhaust is required, that is, when the piezoelectric device stops working, the inflation is stopped, see Figure 7 After the venting hole column 23 is opened, a flow channel is formed at the lower part of the diaphragm 3, and the gas is discharged from the venting hole column 23 to complete the exhaust. In one embodiment, the upper part of the venting hole column 23 has a plug for closing the venting hole, and exhaust can be performed after the plug is removed.

[0037] The middle part of the air leakage hole column 23 is provided with an air leakage hole for exhausting gas. When the diaphragm 3 covers the air leakage hole column 23, the air leakage hole is covered and closed.

[0038] Among them, the diaphragm 3 separates the valve body cavity 21 to form an inflation flow cavity and a deflation flow cavity. The inflation flow cavity is formed by the air inlet 12, the check valve hole 31, the valve body cavity 21, and the inflation nozzle 22 connected in sequence, and is located on the upper part of the diaphragm 3.

[0039] See also Figure 7 The air leakage flow channel is formed by the inflation nozzle 22, the valve body cavity 21, and the air leakage hole column 23 connected in sequence, and is located below the diaphragm 3.

[0040] Wherein, the diaphragm 3 is a silicone diaphragm.

[0041] See also Figure 4The air outlet cavity 212 is provided with an isolation bracket 4, and the isolation bracket 4 corresponds to the check valve hole 31. The isolation bracket 4 stands on the bottom surface of the air outlet cavity 212. When the diaphragm 3 is pressed downward, the check valve hole 31 of the diaphragm 3 is attached to the isolation bracket 4 and is located in the middle of the isolation bracket 4, so that the check valve hole 31 is located in a suspended position, ensuring that the check valve hole 31 is in an open and connected state.

[0042] See also Figure 4 At least one layer of stepped trough 5 is also provided at the bottom of the outlet cavity 212, and the middle of the stepped trough 5 corresponds to the check valve hole 31, which further prevents the check valve hole 31 from sticking to the bottom of the outlet cavity 212 and causing the diaphragm 3 to be blocked during inflation. The bottom surface of the stepped trough 5 is an inclined surface, extending from the isolation bracket 4 to one side and inclined toward the lower end. The inflation nozzle 22 is provided at the bottom end of the inclined surface of the stepped trough 5. When used for liquid / fluid, the inclined surface helps to discharge the fluid. That is, the piezoelectric pump in this embodiment is not limited to a gas pressure pump, but can also be used for a fluid pressure pump.

[0043] In this embodiment, see Figure 8 The air intake sheet 11 presses the diaphragm 3 tightly, and the diaphragm 3 has an adhesive layer 6 on the upper and lower layers, that is, there is an adhesive layer 6 between the air intake sheet 11 and the diaphragm 3, and there is an adhesive layer 6 between the diaphragm 3 and the valve body 2, and there is a vacant area in the middle of the adhesive layer 6, and the vacant area corresponds to the valve body cavity 21, so that the diaphragm 3 can expand and contract in the valve body cavity 21. The adhesive layer 6 is a double-sided adhesive.

[0044] In this embodiment, the piezoelectric device 1 includes, from top to bottom, a heat sink 13, an air suction cavity 14, an air suction vibration sheet 15, a vibration substrate 16, a piezoelectric ceramic sheet 17, an electrode assembly 18, and the air intake sheet 11; at least one air suction hole 131 is provided on the heat sink 13; the air suction cavity 14 and the air suction vibration sheet 15 are provided with hollow areas around their edges, the air suction holes 131 correspond to the hollow areas, and the air suction holes 131 and the hollow areas correspond to the hollow gaps of the vibration substrate 16.

[0045] The middle of the vibration substrate 16 is a vibration plate 161, and the periphery of the vibration plate 161 is connected to the vibration substrate 16 via a plurality of elastic support arms 162, and a hollow gap is formed between the periphery of the vibration plate 161 and the vibration substrate 16. The piezoelectric device is miniaturized, which is conducive to device packaging.

[0046] In a possible implementation, the air inlet sheet 11 vibrates along with the piezoelectric device 1, delivering gas / fluid to the space of the valve body cavity 21. In this implementation, when pressed down, the air inlet 12 has a position-avoiding effect. In an implementation, when the side of the piezoelectric device 1 is pressed down, the air vent column 23 presses against the air inlet 12, closing the air inlet 12, so that the piezoelectric device 1 can press the gas / fluid into the inflation nozzle 22.

[0047] The piezoelectric pump with a check valve and a relief valve structure described in the utility model has stable pressure output, a stable and reliable relief valve, no air leakage, and no problem of unstable relief valve causing air leakage and thus reducing air pressure output. The product has stable functions. The piezoelectric pump is miniaturized (compact and thin) and has both check valve and relief valve functions.

[0048] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A piezoelectric pump with a check valve and a bleed valve structure, comprising a piezoelectric device and a valve body, wherein the piezoelectric device applies power to the valve body to make the valve body work, and wherein: The valve body is provided with a valve body cavity and an air-inflating nozzle, the valve body cavity includes an air-inflating cavity, an air-outlet cavity and a connecting tube cavity, the connecting tube cavity connects the air-inflating cavity and the air-outlet cavity; the air-inflating nozzle is connected to the air-outlet cavity; the air-inflating cavity is provided with an air-release hole column; A diaphragm is provided on the upper part of the valve body cavity to cover the valve body cavity. The diaphragm is provided with a check valve hole that can be connected to the inflation nozzle. During inflation, the pressure causes the diaphragm to press downward, a flow cavity is formed on the upper part of the diaphragm, and the diaphragm covers and seals the air leakage hole column. The check valve hole of the diaphragm is positioned downward. At this time, the check valve hole is connected to the inflation nozzle, and the gas / fluid is discharged from the inflation nozzle. When inflation stops, the reverse airflow causes the diaphragm to press upward, and the check valve hole of the diaphragm is pressed tightly and closed to a wall of the valve body cavity, which has a check effect. The diaphragm leaves the air leakage hole column. After the air leakage hole column is opened, a flow cavity is formed at the lower part of the diaphragm, and the gas is discharged from the air leakage hole column to complete the deflation.

2. A piezoelectric pump with a check valve and a bleed valve structure according to claim 1, characterized in that: The air outlet cavity is provided with an isolation bracket, which corresponds to the check valve hole. The isolation bracket stands on the bottom surface of the air outlet cavity. When the diaphragm is pressed downward, the check valve hole of the diaphragm is pressed against the isolation bracket, so that the check valve hole is located in a suspended position, ensuring that the check valve hole is in an open and connected state.

3. A piezoelectric pump with a check valve and a bleed valve structure according to claim 2, characterized in that: The bottom of the air outlet cavity is also provided with at least one layer of stepped trough, the stepped trough is an inclined surface, inclined toward one end from the isolation bracket, and the inflation nozzle is arranged at the bottom end of the inclined surface of the stepped trough.

4. A piezoelectric pump with a check valve and a bleed valve structure according to claim 3, characterized in that: The valve body cavity is a groove cavity structure arranged on the bottom surface of the valve body.

5. A piezoelectric pump with a check valve and a bleed valve structure according to any one of claims 1 to 4, characterized in that: An air intake plate is arranged at the bottom of the piezoelectric device, and the air intake plate forms the upper side surface of the valve body cavity; the air intake plate is designed with an air intake port, and the position of the air intake port corresponds to the air leakage hole column, and the air intake port has a avoiding effect.

6. The piezoelectric pump with a check valve and a bleed valve structure according to claim 5, characterized in that: The diaphragm separates the valve body cavity into an inflation flow channel and an deflation flow channel, and the inflation flow channel is formed by sequentially connecting an air inlet, a check valve hole, a valve body cavity, and an inflation nozzle.

7. The piezoelectric pump with a check valve and a bleed valve structure according to claim 6, characterized in that: The degassing flow cavity is formed by sequentially connecting the inflation nozzle, the valve body cavity and the degassing hole column.

8. The piezoelectric pump with a check valve and a bleed valve structure according to claim 7, characterized in that: The air intake sheet presses the diaphragm tightly, and an adhesive layer is arranged between the air intake sheet and the diaphragm, and between the diaphragm and the valve body. The middle of the adhesive layer has a vacant area, which corresponds to the valve body cavity, so that the diaphragm can expand and contract in the valve body cavity.

9. The piezoelectric pump with a check valve and a bleed valve structure according to claim 8, characterized in that: The piezoelectric device includes, arranged from top to bottom, a heat sink, an air suction cavity, an air suction vibration sheet, a vibration substrate, a piezoelectric ceramic sheet, an electrode assembly, and the air intake sheet; at least one air suction hole is arranged on the heat sink; the air suction cavity and the air suction vibration sheet are provided with hollow areas around their edges, the air suction holes correspond to the hollow areas, and the air suction holes, the hollow areas and the hollow gaps of the vibration substrate correspond to each other.

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