Micro air pump

Abstract

A micro air pump comprises: a tube plate having an air inlet and an air outlet; a check valve plate arranged inside the tube plate, the check valve plate having a valve hole and a recessed space, and the valve hole is located at the center of the recessed space; a check baffle plate arranged on the check valve plate, the check baffle plate having a convex portion, and the convex portion is convex toward the valve hole of the check valve plate; an insulating plate arranged on the check baffle plate; a conductive foam arranged on the convex portion of the check baffle plate; an actuator arranged on the insulating plate and in contact with the conductive foam, the actuator having a second pin and a piezoelectric plate, the piezoelectric plate of the actuator and the conductive foam are in contact with each other; and a cover plate arranged on the actuator and sealed with the tube plate.

Description

[Technical field]

[0001] This case is about a gas transmission device, in particular a miniature air pump which can automatically lock the air inlet and outlet when the power is off. [Background technology]

[0002] See also Figure 1A and Figure 1B , is a known micro air pump 10, comprising a tube sheet 101, a check valve sheet 102, a check baffle 103, a first insulating sheet 104, a conductive sheet 105a, a second insulating sheet 105b, a pump 106 and a cover plate 107. The tube sheet 101 has an air inlet 1011 and an air outlet 1012. The check valve sheet 102 is disposed in the tube sheet 101 and has a valve hole 1021. The check baffle 103 is disposed on the check valve sheet 102 and has at least one air flow hole 1031 and a convex portion 1032. The first insulating sheet 104 is disposed on the check baffle 103. The conductive sheet 105a is disposed on the first insulating sheet 104 and has a conductive sheet pin 1051, a conductive sheet contact 1052 and a conductive sheet welding point 1053. The second insulating sheet 105b is disposed on the conductive sheet 105a. The pump 106 is disposed on the second insulating sheet 105 b and has a pump pin 1061 and a piezoelectric sheet 1062 . The cover plate 107 is disposed on the tube plate 101 .

[0003] In the known micro air pump 10, due to the design of the convex portion 1032 of the check baffle 103, it is difficult to make the plane of the check baffle 103 flat during the manufacturing process, resulting in poor yield and poor reliability. In addition, the conductive sheet 105a receives the power of the power system electrode through the conductive sheet pin 1051, and transmits it to the conductive sheet contact 1052 through the conductive sheet solder point 1053, and supplies power to the piezoelectric sheet 1062 of the pump 106 through the conductive sheet contact 1052, wherein the conductive sheet contact 1052 needs to be welded to the conductive sheet 105a through the conductive sheet solder point 1053, which makes it difficult to reduce the solder joint in the welding process, and the use of welding is prone to related problems (such as false welding, solder joint oxidation, and short circuit with other parts caused by too large a solder joint), which reduces the yield and reliability.

[0004] Therefore, how to increase the yield rate of micro air pump manufacturing process, improve reliability, reduce the number of overall product parts, and simplify the manufacturing process is an urgent problem that needs to be solved. [Summary of the invention]

[0005] The main purpose of this case is to provide a micro air pump, which has a power-off non-return effect, has no welding points and uses only one insulating sheet.

[0006] To achieve the above-mentioned purpose, the broader implementation of the present case is to provide a micro air pump, comprising: a tube plate, having an air inlet and an air outlet; a check valve plate, arranged inside the tube plate, the check valve plate having a valve hole and a recessed space, and the valve hole is located at the center of the recessed space; a check baffle, arranged on the check valve plate, the check baffle having at least one air flow hole, a convex portion, at least one buffer bracket and a first pin, and the convex portion is convex to the valve hole of the check valve plate; an insulating sheet, arranged on the check baffle; a conductive foam, arranged on the On the convex portion; an actuator, arranged on the insulating sheet and in contact with the conductive foam, the actuator having a second pin and a piezoelectric sheet, the piezoelectric sheet of the actuator and the conductive foam are in contact with each other; and a cover plate, arranged on the actuator and sealed with the tube plate sleeve; wherein the first pin of the check baffle receives an electrode power supply at one end of a power system, which is transmitted to the conductive foam through the check baffle, and then transmitted to the piezoelectric sheet of the actuator by the conductive foam, and the second pin of the actuator receives the electrode power supply at the other end of the power system to complete the circuit of the power system.

Brief Description of the Drawings

[0007] Figure 1A Shown is a schematic diagram of a known micro air pump in a first perspective view.

[0008] Figure 1B Shown is a schematic diagram of a known micro air pump at a second viewing angle.

[0009] Figure 2A Shown is a schematic diagram of the micro air pump of this case from a first perspective.

[0010] Figure 2B Shown is a schematic diagram of the micro air pump of this case at a second viewing angle.

[0011] Figure 3A Shown is a schematic diagram of the micro air pump in this case from a top view.

[0012] Figure 3B The micro air pump of this case is shown Figure 3A A cross-sectional diagram of the airflow direction along the AA section line during normal operation.

[0013] Figure 3C The micro air pump of this case is shown Figure 3A A cross-sectional diagram of the airflow direction at the BB section line during normal operation.

[0014] Figure 3D The micro air pump of this case is shown Figure 3A The BB section line is a cross-sectional diagram showing the airflow stopping when the operation is interrupted.

[0015]

Explanation of symbols

[0016] 10: Micro air pump

[0017] 101: Tube sheet

[0018] 1011: Air Inlet

[0019] 1012: Air outlet

[0020] 102: Check valve plate

[0021] 1021: Valve hole

[0022] 103: Check plate

[0023] 1031: Air flow hole

[0024] 1032: convex part

[0025] 104: First insulation sheet

[0026] 105a: Conductive sheet

[0027] 105b: Second insulating sheet

[0028] 1051: Conductive sheet pin

[0029] 1052: Conductive sheet contact

[0030] 1053: Conductive sheet solder joint

[0031] 106: Pump

[0032] 1061: Pump pin

[0033] 1062: Piezoelectric sheet

[0034] 107: Cover

[0035] 20: Micro air pump

[0036] 201: Tube sheet

[0037] 2011: Air Intake

[0038] 2012: Vent

[0039] 202: Check valve disc

[0040] 2021: Valve Hole

[0041] 2022: Recessed Space

[0042] 203: Check plate

[0043] 2031: Airflow hole

[0044] 2032: convex part

[0045] 2033: Buffer bracket

[0046] 2034: First pin

[0047] 204: Insulation sheet

[0048] 205: Conductive foam

[0049] 2051: Conductive foam through hole

[0050] 206: Actuator

[0051] 2061: Second pin

[0052] 2062: Piezoelectric sheet

[0053] 207: Cover

[0054] AA, BB: Section line

[0055] R1: First diameter

[0056] T: Total thickness [Specific implementation method]

[0057] The embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various variations in different aspects without departing from the scope of the present invention, and the descriptions and illustrations therein are essentially for illustrative purposes rather than for limiting the present invention.

[0058] See also FIG. 2A to FIG. 3DA micro air pump 20 comprises: a tube sheet 201, having an air inlet 2011 and an air outlet 2012; a check valve plate 202, arranged in the tube sheet 201, the check valve plate 202 having a valve hole 2021 and a recessed space 2022, and the valve hole 2021 is located at the center of the recessed space 2022; a check baffle 203, arranged on the check valve plate 202, the check baffle 203 having at least one air flow hole 2031, a convex portion 2032, at least one buffer bracket 2033 and a first pin 2034, and the convex portion 2032 is convex to the valve hole 2021 of the check valve plate 202; an insulating sheet 204, arranged on the check baffle 203; a conductive foam 205, arranged on the convex portion 2032 of the check baffle 203 032; the actuator 206 is arranged on the insulating sheet 204 and in contact with the conductive foam 205. The actuator 206 has a second pin 2061 and a piezoelectric sheet 2062. The piezoelectric sheet 2062 of the actuator 206 and the conductive foam 205 are in contact with each other; and the cover plate 207 is arranged on the actuator 206 and is sleeved and sealed with the tube plate 201; wherein the first pin 2034 of the check baffle 203 receives the electrode power of one end of the power system, which is transmitted to the conductive foam 205 through the check baffle 203, and then transmitted to the piezoelectric sheet 2062 of the actuator 206 by the conductive foam 205, and the second pin 2061 of the actuator 206 receives the electrode power of the other end of the power system to complete the circuit of the power system.

[0059] It is worth noting that one of the differences between the micro air pump 20 of this case and the known micro air pump 10 is that the known conductive sheet 105a and the second insulating sheet 105b are integrated into a conductive foam 205. The micro air pump 20 of this case does not have solder joints, so there will be no problems associated with welding (such as false welding, solder joint oxidation, and short circuits with other parts caused by excessive solder joints). In addition, due to the reduction in the number of parts, the process yield can be improved and the process steps can be simplified. The second difference between the micro air pump 20 of this case and the known micro air pump 10 is that the check baffle 203 has a buffer bracket 2033. The setting of the buffer bracket 2033 can effectively ensure the flatness of other planes of the check baffle 203, thereby improving its reliability.

[0060] The check baffle 203 has four air flow holes 2031. The diameter of the protrusion 2032 of the check baffle 203 is larger than the diameter of the valve hole 2021 of the check valve plate 202. Four buffer brackets 2033 are arranged around the outer periphery of the protrusion 2032 of the check baffle 203. The buffer bracket 2033 of the check baffle 203 is coplanar with the first pin 2034. It is worth noting that the number of air flow holes 2031 of the check baffle 203 is four, but it is not limited to this. The number of air flow holes 2031 can be adjusted according to the design. The purpose of the air flow holes 2031 is to circulate the gas. In addition, it is worth noting that the diameter of the protrusion 2032 of the non-return baffle 203 must be larger than the diameter of the valve hole 2021 of the non-return valve plate 202. Its function is to ensure that the gas outlet 2012 of the tube plate 201 withstands the gas pressure, and the valve hole 2021 of the non-return valve plate 202 can just block the protrusion 2032 of the non-return baffle 203 to achieve the non-return effect. In addition, it is worth noting that four buffer brackets 2033 are arranged around the outer periphery of the protrusion 2032 of the check baffle 203, but this is not limited to the above. The number of buffer brackets 2033 can be adjusted according to the design. The purpose of the buffer brackets 2033 is to improve the known check baffle 103. When manufacturing the protrusion 1032, it is easy to cause the surface of the check baffle 103 to be uneven, which affects the overall yield and reliability of the check baffle 103. After the improvement, the buffer bracket 2033 makes it easy to keep the buffer bracket 2033 and the first pin 2034 coplanar when manufacturing the protrusion 2032 of the check baffle 203.

[0061] The conductive foam 205 has a first diameter R1, which is smaller than the distance from any airflow hole 2031 to another airflow hole 2031 diagonally opposite to it. In other words, the maximum first diameter R1 of the conductive foam 205 will not block any airflow hole 2031 of the check baffle 203. The purpose of the conductive foam 205 is to conduct power to the piezoelectric sheet 2062 of the actuator 206, and the elasticity of the conductive foam 205 can be used to closely contact the piezoelectric sheet 2062. It is worth noting that the size of the conductive foam through hole 2051 of the conductive foam 205 can be the size of the protrusion 2032 of the check baffle 203. The purpose of the conductive foam through hole 2051 is to facilitate and quickly align it on the check baffle 203.

[0062] The first pin 2034 of the check baffle 203 receives the electrode power of one end of the power system, which is transmitted to the conductive foam 205 through the check baffle 203, and then transmitted to the piezoelectric sheet 2062 of the actuator 206 by the conductive foam 205. The second pin 2061 of the actuator 206 then receives the electrode power of the other end of the power system, completing the circuit of the power system. When the power supply of the power system is interrupted, the valve hole 2021 of the check valve plate 202 and the convex part 2032 of the check baffle 203 are tightly fitted, so that the gas outlet 2012 of the tube plate 201 achieves a check effect. It is worth noting that the first pin 2034 and the second pin 2061 are used to receive the electrode power supply at one end and the electrode power supply at the other end, respectively, so that the piezoelectric sheet 2062 generates reciprocating bending vibrations, and the electrode power supply at one end and the electrode power supply at the other end are applied to the piezoelectric sheet 2062 alternately at a frequency; wherein, the electrode power supply at one end and the electrode power supply at the other end can be respectively the positive pole and the negative pole of the same power supply system (not shown), but not limited to this. In other embodiments, the power supply system of the electrode power supply at one end and the electrode power supply at the other end can also be adjusted according to design requirements (such as sine wave, pulse wave, square wave, sawtooth wave, etc.). In other embodiments of the present case, the power supply system, voltage value, and the alternating frequency of the electrode power supply at one end and the electrode power supply at the other end can also be adjusted according to design requirements. In addition, it is worth noting that the check baffle 203 and the conductive foam 205 are conductive materials, and the conductive material can be one of gold, silver, copper, alloys, or a combination thereof.

[0063] See also Figure 2A , Figure 2B , Figure 3B and Figure 3C The total thickness T of the micro air pump 20 is between 2 mm and 5 mm. The air inlet 2011 of the micro air pump 20 provides negative air pressure, i.e., suction, while the air outlet 2012 provides positive air pressure, i.e., blowing. When the actuator 206 is driven, gas enters from the air inlet 2011. As the actuator 206 is continuously actuated, gas is continuously introduced from the air inlet 2011 and flows through the actuator 206, and flows into the concave space 2022 of the check valve plate 202 through the four air flow holes 2031, so that the gas is then introduced into the tube plate 201 through the valve hole 2021, and finally discharged from the air outlet 2012. The flow of gas generates thrust, which causes the bottom of the concave space 2022 of the check valve plate 202 to deform. This action causes the valve hole 2021 to just break away from the convex portion 2032 of the check baffle 203, so that the gas pressure is released, and the gas flows through the air flow holes 2031 of the check baffle 203 (such as Figure 3B As shown), the gas is finally discharged from the gas outlet 2012 to complete the gas transmission.

[0064] See also Figure 3DWhen the gas from the gas outlet 2012 flows back to the micro air pump 20, the check valve plate 202 is pushed toward the check partition 203 by the gas pressure, so that the original valve hole 2021 blocks the convex part 2032, so that the gas cannot flow back and the effect of non-return flow is achieved.

[0065] In summary, the present invention can effectively ensure the flatness of other planes of the check baffle 203 by virtue of the micro air pump 20 having no welding points and the buffer bracket 2033 of the check baffle 203, and integrate the known conductive sheet 105a and the second insulating sheet 105b into the conductive foam 205, thereby improving the process yield, improving reliability, reducing the number of overall product parts, and simplifying the process. In addition, through the design of the valve hole 2021 and the convex portion 2032, the actuator 206 has a check effect when it stops operating. Therefore, the present invention has great industrial utilization value, and the application is filed in accordance with the law.

[0066] This case can be modified in various ways by those skilled in the art, but all of them will not deviate from the scope of protection sought by the attached patent application.

Claims

1. A micro air pump, comprising: A tube sheet having an air inlet and an air outlet; A check valve plate is disposed inside the tube plate, the check valve plate has a valve hole and a recessed space, and the valve hole is located at the center of the recessed space; A check baffle is disposed on the check valve plate, the check baffle having at least one air flow hole, a convex portion, at least one buffer bracket and a first pin, and the convex portion is convex toward the valve hole of the check valve plate; an insulating sheet, disposed on the non-return baffle; A conductive foam is disposed on the convex portion of the check baffle; an actuator, disposed on the insulating sheet and in contact with the conductive foam, the actuator having a second pin and a piezoelectric sheet, the piezoelectric sheet of the actuator and the conductive foam being in contact with each other; and A cover plate is disposed on the actuator and is sleeved and sealed with the tube plate; Among them, the first pin of the check baffle receives the power of one electrode of a power system, which is transmitted to the conductive foam through the check baffle, and then transmitted to the piezoelectric piece of the actuator by the conductive foam. The second pin of the actuator then receives the power of the other electrode of the power system to complete the circuit of the power system.

2. The micro air pump according to claim 1, characterized in that: The non-return baffle has four air flow holes, the diameter of the convex part of the non-return baffle is larger than the diameter of the valve hole of the non-return valve plate, and four buffer brackets are arranged around the periphery of the convex part of the non-return baffle.

3. The micro air pump according to claim 2, characterized in that: The conductive foam has a first diameter, which is smaller than the distance from any of the air flow holes to another air flow hole diagonally opposite to the first diameter.

4. The micro air pump according to claim 3, characterized in that: The plurality of buffer brackets of the check baffle are coplanar with the first pin.

5. The micro air pump according to claim 1, characterized in that: When the actuator is driven, gas enters from the air inlet, flows into the concave space of the check valve plate through at least one air flow hole, is introduced into the tube plate through the valve hole, and is finally discharged from the air outlet.

6. The micro air pump according to claim 1, characterized in that: When the power supply of the power system is interrupted, the valve hole of the check valve plate is tightly fitted with the convex part of the check baffle, so that the gas outlet of the tube plate forms a non-return flow.

7. The micro air pump according to claim 1, characterized in that: The check baffle and the conductive foam are made of conductive materials.

8. The micro air pump according to claim 1, characterized in that: The total thickness of the micro air pump is between 2 mm and 5 mm.

9. The micro air pump according to claim 1, characterized in that: The air inlet of the micro air pump provides negative air pressure, while the air outlet provides positive air pressure.

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