CN113623187B - Double-cavity asynchronous suction-exhaust type piezoelectric pump - Google Patents

Abstract

The invention relates to the technical field of piezoelectric pumps, and discloses a double-cavity asynchronous suction and discharge type piezoelectric pump, which comprises: the first pump body and the first drive plate are connected, and the first pump body and the first drive plate surround to form a first cavity; the first pump body is provided with a first inlet and a first outlet; a first driving inclined plane is arranged on the first driving plate; the second pump body and the second drive plate are connected and surround to form a second cavity; a second inlet and a second outlet are arranged on the second pump body; a second driving inclined plane is arranged on the second driving plate; the piezoelectric sheet is connected with the first driving plate and the second driving plate, and the first driving plate can convey fluid from the first inlet to the first outlet through the first chamber; the second drive plate may convey fluid from the second inlet port through the second chamber to the first inlet port. The piezoelectric pump has the advantages that the piezoelectric pump is simple in overall structure, the double cavities are arranged to alternately suck and discharge fluid, the fluid flowing speed is improved, and the efficiency is high.

Description

A double-cavity asynchronous suction-discharge piezoelectric pump

technical field

The invention relates to the technical field of piezoelectric pumps, in particular to a double-chamber asynchronous suction-discharge piezoelectric pump.

Background technique

Nowadays, piezoelectric pumps have been widely used in the field of fluid transmission. It relies on the reciprocating vibration of the piezoelectric vibrator to provide driving force for the fluid, and controls the flow direction of the fluid through the valve to achieve fluid transmission.

The existing piezoelectric pump usually has only one chamber, under the action of the piezoelectric vibrator, the fluid is sucked in from the inlet and discharged from the outlet through the chamber, but the fluid flow rate is slow and the transmission efficiency is low; and the existing piezoelectric pump Pump displacement is low and fluid delivery is not continuous. In addition, the one-way valve of the existing valved piezoelectric pump has poor sealing performance, and the one-way valve cannot be opened and closed smoothly.

Contents of the invention

In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to propose a double-cavity asynchronous suction-discharge piezoelectric pump with simple structure and high fluid transmission efficiency.

The technical solution adopted by the present invention to solve the technical problem is to propose a double-cavity asynchronous suction-discharge piezoelectric pump, including:

A connected first pump body and a first drive plate, the first pump body and the first drive plate enclose a first chamber; the first pump body is provided with a first inlet and a first outlet ; Wherein, the first driving plate is provided with a first driving slope, and the first driving slope is inclined from the side of the first inlet to the side of the first outlet;

A connected second pump body and a second drive plate, the second pump body and the second drive plate enclose a second chamber; the second pump body is provided with a second inlet and a second outlet ; Wherein, the second driving plate is provided with a second driving slope, and the second driving slope is inclined from the second inlet side to the second outlet side;

a piezoelectric sheet connected to the first drive plate and the second drive plate, the first drive plate can transport fluid from the first inlet to the first outlet through the first chamber place; the second driving plate can deliver fluid from the second inlet through the second chamber to the second outlet.

Further, a first connection surface is provided on the first drive plate, a second connection surface is provided on the second drive plate, and a plurality of the first drive slope and the second drive slope are provided;

The first connection surface is connected to two adjacent first driving slopes in an N-shape, and the second connection surface is connected to two adjacent second driving slopes in an N-shape.

Further, it also includes a first inflow valve, a second inflow valve, a first outflow valve and a second outflow valve, the first inflow valve is arranged in the first inflow port, the second inflow valve The inlet valve is arranged in the second inlet, the first outlet valve is arranged in the first outlet, and the second outlet valve is arranged in the second outlet.

Further, the first inflow valve, the second inflow valve, the first outflow valve and the second outflow valve are all one-way valves.

Further, the one-way valve includes an openable and closable valve head and a channel that can communicate with the valve head, and the valve head includes a plurality of movable blocks; the movable blocks can block the channel.

Further, it also includes a connecting piece, the first driving board is connected to the piezoelectric sheet through the connecting piece, the second driving board is connected to the piezoelectric piece through the connecting piece; and the connection A component is connected to the bottom of the first driving slope or the second driving slope.

Further, it also includes a sealing ring, the piezoelectric sheet is arranged between the first pump body and the second pump body, the first pump body is provided with a first groove along its circumference, and the first pump body The second pump body is provided with a second groove along its circumference, and the sealing ring is respectively arranged in the first groove and the second groove; and both sides of the piezoelectric sheet are in contact with the sealing ring .

Further, it also includes a housing, the housing has an accommodating cavity, an inflow cavity and an outflow cavity, and the inflow cavity and the outflow cavity communicate with both ends of the accommodating cavity respectively;

The first pump body and the second pump body are accommodated in the accommodation chamber, the first inlet port and the second inlet port are both connected to the inlet chamber, and the first outlet port and the second outlet port are both connected to the inlet chamber. Both outlets are in communication with the outlet cavity.

Further, the housing is provided with a third inlet and a third outlet, the third inlet communicates with the inlet cavity, and the third outlet communicates with the outlet cavity connected.

Further, the housing includes a first housing and a second housing, and the first housing and the second housing are detachably connected.

Compared with the prior art, the present invention has at least the following beneficial effects:

In the present invention, the first pump body and the first drive plate form the first chamber, and the second pump body and the second drive plate form the second chamber, that is, the entire piezoelectric pump has two chambers. The driving plate and the second driving plate are separated, the piezoelectric sheet is connected to the first driving plate and the second driving plate, and the piezoelectric sheet vibrates so that the first driving slope on the first driving plate and the second driving slope on the second driving plate push the fluid flow, the overall structure is simple, and the fluid flow rate can be accelerated to increase the fluid output power. The piezoelectric pump has a first inlet and a first outlet, a second inlet and a second outlet, and under the action of the piezoelectric sheet, when the fluid is sucked into the first chamber from the first inlet , the fluid in the second chamber is discharged from the second outlet; when the fluid is sucked into the second chamber from the second inlet, the fluid in the first chamber is discharged from the first outlet; the whole process can be realized The continuous transmission of fluid doubles the pumping efficiency. And the inlet chamber on the housing is connected with the first inlet port and the second inlet port, and the outlet chamber is connected with the first outlet port and the second outlet port, so that the whole piezoelectric pump has only one inlet port with the outside. Stream interface and outflow interface, easy to use. The first inflow valve, the second inflow valve, the first outflow valve and the second outflow valve are all one-way valves, which can realize the opening and closing of the valve head according to the pressure of the fluid, thereby controlling the flow direction of the fluid. The valve has good sealing performance and the valve head opens and closes smoothly to ensure fluid transmission.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the present invention;

Figure 2 is an exploded view of Figure 1;

Fig. 3 is the sectional view of Fig. 1;

Fig. 4 is a schematic diagram of the structure after removing the housing in Fig. 1;

Fig. 5 is a sectional view of Fig. 4;

Fig. 6 is the structural representation of one-way valve;

FIG. 7 is a schematic diagram of another perspective of FIG. 6;

Figure 8 is a sectional view of the housing;

Fig. 9 is a schematic diagram of force decomposition on the first driving slope or the second driving slope.

In the picture:

1. The first pump body; 10. The first inlet; 11. The first outlet; 12. The first groove; 100. The first chamber;

2. The first driving plate; 20. The first driving slope; 21. The first connecting surface; 200. The second chamber;

3. The second pump body; 30. The second inlet; 31. The second outlet; 32. The second groove;

4. The second driving plate; 40. The second driving slope; 41. The second connecting surface;

5. Piezoelectric sheet; 6. Connector; 61. First inlet valve; 62. Second inlet valve; 63. First outlet valve; 64. Second outlet valve; 610. Valve head; 611. channel; 6100, active block;

7. Housing; 70. First housing; 71. Second housing; 72. Accommodating chamber; 73. Inflow chamber; 74. Outflow chamber; 75. Third inlet; 76. Third outlet mouth;

8. Wires.

Detailed ways

The following are specific embodiments of the present invention and in conjunction with the accompanying drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

As shown in Figures 1 to 8, a double-cavity asynchronous suction-discharge piezoelectric pump needs to be explained: the double-cavity asynchronous suction-discharge piezoelectric pump refers to that the first chamber 100 and the second chamber 200 When the electric sheet 5 vibrates upwards or downwards, one of them is a suction flow, and the other is a discharge flow; that is, the two chambers are not synchronous suction flow and discharge flow.

Specifically, the main body of the dual-cavity asynchronous suction-discharge piezoelectric pump includes: a first pump body 1 , a first drive plate 2 , a second pump body 3 , a second drive plate 4 and a piezoelectric sheet 5 . The first pump body 1 and the first drive plate 2 are connected to form a first chamber 100, and the first pump body 1 is provided with a first inlet 10 and a first outlet 11; the second pump body 3 and the second drive The plates 4 are connected to form a second chamber 200 , and the second pump body 3 is provided with a second inlet 30 and a second outlet 31 . That is, the main body of the piezoelectric pump has two chambers, the first chamber 100 and the second chamber 200, and the two chambers are not communicated with each other. The first inlet 10 and the first outlet 11 are connected to the first chamber 100. The second inlet 30 and the second outlet 31 communicate with the second chamber 200 . Wherein, the first driving plate 2 is provided with a first driving slope 20, and the first driving slope 20 is inclined from the side of the first inlet 10 to the side of the first outlet 11; the second driving board 4 is provided with a second driving Inclined surface 40, the second driving inclined surface 40 is inclined from the side of the second inlet port 30 to the side of the second outlet port 31; the piezoelectric sheet 5 is connected and can drive the first driving plate 2 and the second driving plate 4 to vibrate, through the first The first driving slope 20 on the driving plate 2 can transport the fluid from the first inlet 10 to the first outlet 11 through the first chamber; the second driving plate 4 can transport the fluid from the second inlet 30 It is transported to the second outlet 31 through the second chamber.

As shown in Fig. 3 and Fig. 5, the first driving plate 2 is provided with a first connecting surface 21, the second driving plate 4 is provided with a second connecting surface 41, and the first driving inclined surface 20 and the second driving inclined surface 40 are both A plurality of first driving slopes 20 are arranged at intervals, and a plurality of second driving slopes 40 are arranged at intervals; the first connecting surface 21 connects two adjacent first driving slopes 20, and forms an N shape after connection. type; the second connecting surface 41 connects two adjacent second driving slopes 40, and is N-shaped after being connected.

The double-cavity asynchronous suction-discharge piezoelectric pump also includes a first inlet valve 61, a second inlet valve 62, a first outlet valve 63 and a second outlet valve 64, and the first inlet valve 61 is arranged on the first inlet valve. In the outlet 10, the second inlet valve 62 is arranged in the second inlet 30, the first outlet valve 63 is arranged in the first outlet 11, and the second outlet valve 64 is arranged in the second outlet. 31 in.

As shown in FIG. 6 and FIG. 7 , the first inflow valve 61 , the second inflow valve 62 , the first outflow valve 63 and the second outflow valve 64 are all one-way valves. The one-way valve includes a valve head 610 that can be opened and closed and a channel 611 that can communicate with the valve head 610 . The valve head 610 includes a plurality of movable blocks 6100 ; the movable blocks 6100 can block the channel 611 . The valve head 610 can be opened and closed according to the pressure of the fluid. When the fluid flows from the channel 611 to the valve head 610, the movable blocks 6100 are squeezed by the fluid to open each other, so that the fluid flows through the one-way valve; When the block 6100 side flows to the channel 611, the pressure generated by the fluid perpendicular to the movable blocks 6100 will make the movable blocks 6100 close to each other, and the valve head 610 will be closed, thereby preventing the fluid from flowing through the one-way valve; the one-way valve passes through each movable block 6100 The opening and closing of the valve head 610 is realized by opening and closing, the valve head 610 opens and closes smoothly, and under the action of fluid, the one-way valve has good sealing performance.

As shown in Figure 3 and Figure 8, the dual-chamber asynchronous suction-discharge piezoelectric pump also includes a housing 7, the housing has a housing chamber 72, an inlet chamber 73 and an outlet chamber 74, the inlet chamber 73 and the outlet chamber 74 They communicate with both ends of the chamber 72 respectively; the first pump body 1 and the second pump body 3 are housed in the chamber 72, that is, the piezoelectric pump forms a closed whole; the first inlet 10 and the second inlet 30 are connected with the inlet chamber 73, the fluid is collected in the inlet chamber 73 through the first inlet port 10 and the second inlet port 30, and the first outlet port 11 and the second outlet port 31 are connected with the outlet chamber 74 communicates, and the fluid is collected in the outflow chamber 74 through the first outflow port 11 and the second outflow port 31; and the inflow chamber 73 and outflow chamber 74 are tapered to facilitate fluid collection. A third inlet 75 and a third outlet 76 are opened on the housing 7, the third inlet 75 communicates with the inlet chamber 73, the third outlet 76 communicates with the outlet chamber 74, and the outside passes through the first Three inlet ports 75 and a third outlet port 76 input and output fluid.

The working principle of the present invention is: the piezoelectric pump is composed of a housing 7 and a first pump body 1 and a second pump body 2 accommodated in the housing 7; The third inlet 75 and the third outlet 76 on the housing 7, the fluid enters the inlet cavity 73 through the third inlet 75, and then passes through the first inlet 10 and the second inlet 30 Entering the first chamber 100 and the second chamber 200 respectively, the first driving plate 2 and the second driving plate 4 vibrate under the action of the piezoelectric sheet 5, pushing the fluid from the first inlet 10 side to the first outlet. The outlet 11 is pushed from the second inlet port 30 to the second outlet port 31, and then enters the outlet chamber 74 from the first outlet port 11 and the second outlet port 31 respectively, and passes through the third outlet port. 76 discharge; the piezoelectric sheet 5 makes the first drive plate 2 and the second drive plate 4 vibrate upwards or downwards respectively, when the fluid is sucked into the first chamber 100 from the first inlet 10, the second chamber 200 The fluid in the first chamber 100 is discharged from the first outlet 10 when the fluid is sucked into the second chamber 200 from the second inlet 30, and the whole process can realize fluid flow. Continuous transmission, and increase the output pressure of the fluid, improve the efficiency of fluid transmission.

As shown in Figures 5 and 9, when the piezoelectric sheet 5 moves upwards, the first driving slope 20 on the first driving plate 2 will generate a force F1 perpendicular to the first driving slope 20, under the action of F1, The fluid above the first driving slope 20 will generate an acceleration a1 perpendicular to the first driving slope 20, which can be decomposed into a horizontal acceleration a3 and a vertical acceleration a2. When the fluid has an upward acceleration, the inner wall of the first pump body 1 will generate a downward force F2, and the acceleration a2' and a2 of the fluid by F2 cancel each other out. Therefore, the whole fluid is only subjected to the force F3 in the horizontal direction, and the first driving slope 20 increases the flow velocity of the fluid. When the piezoelectric sheet 5 moves downward, the second drive plate 4 is stressed in the same way as above.

As shown in Figure 5, the piezoelectric pump also includes a connector 6, the first drive plate 2 is connected to the piezoelectric sheet 5 through the connector 6, and the second drive plate 4 is connected to the piezoelectric sheet 5 through the connector 6; and the connection The member 6 is connected to the bottom of the first driving ramp 20 or the second driving ramp 40 . The connector 6 has a certain elasticity, which can effectively prevent the wear of the first drive plate 2, the second drive plate 4 and the piezoelectric sheet 5, and ensure that the first drive plate 2 and the second drive plate 4 vibrate with the piezoelectric sheet 5 respectively .

In this embodiment, it also includes a sealing ring (not shown in the figure), the piezoelectric sheet 5 is arranged between the first pump body 1 and the second pump body 3, and the first pump body 1 is provided with a first recess along its circumference. groove 12, the second pump body 3 is provided with a second groove 32 along its circumference, and the sealing ring is arranged in the first groove 12 and the second groove 32; and both sides of the piezoelectric sheet 5 are in contact with the sealing ring . That is, the piezoelectric sheet 5 is fixed in the casing 7 through the first pump body 1 and the second pump body 3, and the upper and lower sides of the piezoelectric sheet 5 are provided with sealing rings, which can prevent fluid from entering the first drive plate 2 and the Between the piezoelectric sheet 5 or the second driving board 4 and the piezoelectric sheet 5 , the contact between the fluid and the piezoelectric sheet 5 is avoided.

As shown in Figures 1-3, the housing 7 includes a first housing 70 and a second housing 71, and the first housing 70 and the second housing 71 are detachably connected to facilitate the first pump body 1 and the second pump Installation of body 3 etc. The wires 8 pass through the housing 7 and are connected to the piezoelectric sheet 5 , and the inner wall of the housing 7 has a gap with the first pump body 1 and the second pump body 3 , which facilitates the arrangement of the wires 8 .

In this solution, the double-cavity asynchronous suction-discharge piezoelectric pump increases the flow rate of the fluid through the driving plate with the driving slope, and improves the fluid transmission efficiency. The structure of the driving plate is simple and easy to manufacture; Under the action, the alternate suction and discharge of the two chambers can be realized to ensure the continuous transmission of the fluid; the whole piezoelectric pump is only connected to the outside through the inlet and outlet ports on the shell, which is convenient for use.

It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relationship between the components in a certain posture (as shown in the figure). Relative positional relationship, movement conditions, etc., if the specific posture changes, the directional indication will also change accordingly.

In addition, in the present invention, descriptions such as "first", "second", "one" and so on are used for descriptive purposes only, and should not be understood as indicating or implying their relative importance or implicitly indicating the indicated technical features quantity. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

In the present invention, unless otherwise specified and limited, the terms "connection" and "fixation" should be understood in a broad sense, for example, "fixation" can be a fixed connection, a detachable connection, or an integral body; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be an internal communication between two elements or an interaction relationship between two elements, unless otherwise clearly defined. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In addition, the technical solutions of the various embodiments of the present invention can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered as a combination of technical solutions. Does not exist, nor is it within the scope of protection required by the present invention.

Claims (9)

1. A double-chamber asynchronous suction-discharge piezoelectric pump, characterized in that it includes: A connected first pump body and a first drive plate, the first pump body and the first drive plate enclose a first chamber; the first pump body is provided with a first inlet and a first outlet ; Wherein, the first driving plate is provided with a first driving slope, and the first driving slope is gradually inclined downward from the side of the first inlet to the side of the first outlet; A connected second pump body and a second drive plate, the second pump body and the second drive plate enclose a second chamber; the second pump body is provided with a second inlet and a second outlet ; Wherein, the second driving plate is provided with a second driving slope, and the second driving slope is gradually inclined upward from the side of the second inlet to the side of the second outlet; a piezoelectric sheet connected to the first drive plate and the second drive plate, the first drive plate can transport fluid from the first inlet to the first outlet through the first chamber place; the second driving plate can deliver fluid from the second inlet through the second chamber to the second outlet; Wherein, the first drive plate is provided with a first connection surface, the second drive plate is provided with a second connection surface, and the first drive slope and the second drive slope are provided with a plurality; The first connection surface is connected to the two adjacent first driving slopes in an N-shape, and the second connection surface is connected to the two adjacent second driving slopes in an N-shape. 2. A double-cavity asynchronous suction-discharge piezoelectric pump according to claim 1, further comprising a first inlet valve, a second inlet valve, a first outlet valve and a second outlet valve, The first inflow valve is set in the first inflow port, the second inflow valve is in the second inflow port, and the first outflow valve is in the first outflow port , the second outflow valve is disposed in the second outflow port. 3. A double-cavity asynchronous suction-discharge piezoelectric pump according to claim 2, wherein the first inlet valve, the second inlet valve, the first outlet valve and the second outlet valve are all is a one-way valve. 4. A double-cavity asynchronous suction-discharge piezoelectric pump according to claim 3, wherein the one-way valve includes a valve head that can be opened and closed and a channel that can communicate with the valve head, and the valve head The head includes a plurality of movable blocks; the movable blocks can block the channel. 5. A double-chamber asynchronous suction-discharge piezoelectric pump according to claim 1, further comprising a connecting piece, the first drive plate and the piezoelectric sheet are connected through the connecting piece, the The second driving plate is connected to the piezoelectric sheet through the connecting piece; and the connecting piece is connected to the bottom of the first driving slope or the second driving slope. 6. A double-chamber asynchronous suction-discharge piezoelectric pump according to claim 1, further comprising a sealing ring, the piezoelectric sheet is arranged between the first pump body and the second pump body Between, the first pump body is provided with a first groove along its circumference, the second pump body is provided with a second groove along its circumference, and the sealing rings are respectively arranged in the first groove and the second groove. In the groove; and both sides of the piezoelectric sheet abut against the sealing ring. 7. A double-chamber asynchronous suction-discharge piezoelectric pump according to claim 1, further comprising a housing, the housing has a receiving chamber, an inlet chamber and an outlet chamber, and the inlet chamber The outflow cavity and the outflow cavity are respectively communicated with the two ends of the accommodating cavity; The first pump body and the second pump body are accommodated in the accommodation chamber, the first inlet port and the second inlet port are both connected to the inlet chamber, and the first outlet port and the second outlet port are both connected to the inlet chamber. Both outlets are in communication with the outlet cavity. 8. A double-chamber asynchronous suction-discharge piezoelectric pump according to claim 7, wherein a third inlet and a third outlet are opened on the housing, and the third inlet It communicates with the inlet chamber, and the third outlet port communicates with the outlet chamber. 9. A double-cavity asynchronous suction-discharge piezoelectric pump according to claim 7, wherein the housing comprises a first housing and a second housing, and the first housing and the second housing Detachable connection.

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