CN113623187B

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

Info

Publication number: CN113623187B
Application number: CN202110722135.9A
Authority: CN
Inventors: 陈啟源; 陈晓平; 李军军; 蔡贤杰; 陈劲松; 吴潇
Original assignee: Ningbo University of Technology
Current assignee: Ningbo University of Technology
Priority date: 2021-06-28
Filing date: 2021-06-28
Publication date: 2023-02-03
Anticipated expiration: 2041-06-28
Also published as: CN113623187A

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

Double-cavity asynchronous suction-exhaust type piezoelectric pump

Technical Field

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

Background

Nowadays, piezoelectric pumps are widely used in the field of fluid transmission, and rely on the reciprocating vibration of a piezoelectric vibrator to provide a driving force for a fluid, and control the flow direction of the fluid through a valve, thereby realizing the transmission of the fluid.

The existing piezoelectric pump is generally provided with only one chamber, fluid is sucked from a fluid inlet under the action of a piezoelectric vibrator and is discharged from a fluid outlet through the chamber, but the fluid flow rate is slow and the transmission efficiency is low; and the prior piezoelectric pump has small displacement and discontinuous fluid transmission. In addition, the one-way valve of the existing valved piezoelectric pump has poor sealing performance and is not smoothly opened and closed.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides a double-cavity asynchronous suction-exhaust type piezoelectric pump which is simple in structure and high in fluid transmission efficiency.

The technical scheme adopted by the invention for solving the technical problem is to provide a double-cavity asynchronous suction-discharge type piezoelectric pump, which comprises the following components:

the pump comprises a first pump body and a first driving plate which are connected, wherein the first pump body and the first driving plate surround to form a first cavity; the first pump body is provided with a first inlet and a first outlet; the first driving plate is provided with a first driving inclined surface, and the first driving inclined surface inclines from the first inflow port side to the first outflow port side;

the second pump body and the second driving plate are connected and surround to form a second cavity; a second inlet and a second outlet are arranged on the second pump body; the second driving plate is provided with a second driving inclined surface, and the second driving inclined surface inclines from the second inflow port side to the second outflow port side;

a piezoelectric sheet connected to the first and second drive plates, wherein the first drive plate can deliver fluid from the first inlet port to the first outlet port via the first chamber; the second drive plate may deliver fluid from the second inlet port through the second chamber to the second outlet port.

Furthermore, the first driving plate is provided with a first connecting surface, the second driving plate is provided with a second connecting surface, and the first driving inclined surfaces and the second driving inclined surfaces are provided with a plurality of connecting surfaces;

the first connecting surface is connected with two adjacent first driving inclined surfaces to form an N shape, and the second connecting surface is connected with two adjacent second driving inclined surfaces to form an N shape.

The first outlet valve is arranged in the first outlet, and the second outlet valve is arranged in the second outlet.

Further, the first inlet valve, the second inlet valve, the first outlet valve and the second outlet valve are all one-way valves.

Further, the one-way valve comprises an openable valve head and a channel communicated with the valve head, and the valve head comprises a plurality of movable blocks; the movable block can block the channel.

The piezoelectric patch is characterized by further comprising a connecting piece, the first driving plate is connected with the piezoelectric patch through the connecting piece, and the second driving plate is connected with the piezoelectric patch through the connecting piece; and the connecting piece is connected to the bottom of the first driving inclined plane or the second driving inclined plane.

The piezoelectric piece is arranged between the first pump body and the second pump body, a first groove is formed in the first pump body along the circumferential direction of the first pump body, a second groove is formed in the second pump body along the circumferential direction of the second pump body, and the sealing rings are arranged in the first groove and the second groove respectively; and the two sides of the piezoelectric piece are abutted to the sealing ring.

The shell is provided with a containing cavity, a flow inlet cavity and a flow outlet cavity, and the flow inlet cavity and the flow outlet cavity are respectively communicated with two ends of the containing cavity;

the first pump body and the second pump body are accommodated in the accommodating cavity, the first inflow port and the second inflow port are communicated with the inflow cavity, and the first outflow port and the second outflow port are communicated with the outflow cavity.

Furthermore, a third inlet and a third outlet are formed in the shell, the third inlet is communicated with the inlet cavity, and the third outlet is communicated with the outlet cavity.

Further, the shell comprises a first shell and a second shell, and the first shell is detachably connected with the second shell.

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

according to the piezoelectric pump, the first pump body and the first drive plate are encircled to form a first cavity, the second pump body and the second drive plate are encircled to form a second cavity, namely the whole piezoelectric pump is provided with two cavities, the two cavities are separated through the first drive plate and the second drive plate, the piezoelectric sheet is connected with the first drive plate and the second drive plate, and the piezoelectric sheet vibrates to enable the first drive inclined surface on the first drive plate and the second drive inclined surface on the second drive plate to push fluid to flow. The piezoelectric pump is provided with a first fluid inlet, a first fluid outlet, a second fluid inlet and a second fluid outlet, and under the action of the piezoelectric sheet, when fluid is sucked into the first chamber from the first fluid inlet, the fluid in the second chamber is discharged from the second fluid outlet; when fluid is sucked into the second chamber from the second inflow port, the fluid in the first chamber is discharged from the first outflow port; the whole process can realize the continuous transmission of the fluid, and the pumping efficiency is doubly improved. And the inflow cavity on the shell is communicated with the first inflow port and the second inflow port, and the outflow cavity is communicated with the first outflow port and the second outflow port, so that the whole piezoelectric pump only has one inflow interface and one outflow interface with the outside, and the piezoelectric pump is convenient to use. The first inlet valve, the second inlet valve, the first outlet valve and the second outlet valve are all one-way valves, the valve heads can be opened and closed according to the pressure of fluid, so that the flow direction of the fluid is controlled, the one-way valves are good in sealing performance, the valve heads are opened and closed smoothly, and the transmission of the fluid is guaranteed.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is an exploded view of FIG. 1;

FIG. 3 is a cross-sectional view of FIG. 1;

FIG. 4 is a schematic view of the structure of FIG. 1 with the housing removed;

FIG. 5 is a cross-sectional view of FIG. 4;

FIG. 6 is a schematic view of the check valve;

FIG. 7 is another schematic view of FIG. 6;

FIG. 8 is a cross-sectional view of the housing;

fig. 9 is a force exploded view of the first driving ramp or the second driving ramp.

In the figure:

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

2. a first drive plate; 20. a first drive ramp; 21. a first connection face; 200. a second chamber;

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

4. a second drive plate; 40. a second drive ramp; 41. a second connection face;

5. a piezoelectric sheet; 6. a connecting member; 61. a first inlet valve; 62. a second inlet valve; 63. a first outlet valve; 64. a second outlet valve; 610. a valve head; 611. a channel; 6100. a movable block;

7. a housing; 70. a first housing; 71. a second housing; 72. an accommodating chamber; 73. a flow inlet cavity; 74. an outflow cavity; 75. a third inlet; 76. a third outlet;

8. an electric wire.

Detailed Description

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

As shown in fig. 1 to fig. 8, a dual-cavity asynchronous suction and discharge type piezoelectric pump is explained as follows: the double-cavity asynchronous suction and discharge type piezoelectric pump means that when the piezoelectric sheet 5 vibrates upwards or downwards, one of the first chamber 100 and the second chamber 200 is used for sucking flow, and the other one is used for discharging flow; i.e. the two chambers are not simultaneously sucking and discharging.

Specifically, this asynchronous row formula piezoelectric pump main part that inhales of two-chamber includes: the pump comprises 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 is connected with the first driving plate 2 to form a first cavity 100, and a first inlet 10 and a first outlet 11 are arranged on the first pump body 1; the second pump body 3 and the second driving plate 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 piezoelectric pump body has two chambers, i.e., a first chamber 100 and a second chamber 200, which are not communicated with each other, the first inlet 10 and the first outlet 11 are communicated with the first chamber 100, and the second inlet 30 and the second outlet 31 are communicated with the second chamber 200. Wherein, the first driving plate 2 is provided with a first driving inclined plane 20, and the first driving inclined plane 20 inclines from the first inlet 10 side to the first outlet 11 side; a second driving inclined plane 40 is arranged on the second driving plate 4, and the second driving inclined plane 40 inclines from the second inlet 30 side to the second outlet 31 side; the piezoelectric sheet 5 is connected with the first driving plate 2 and the second driving plate 4 and can drive the first driving plate 2 and the second driving plate 4 to vibrate, and fluid can be conveyed from the first inlet 10 to the first outlet 11 through the first chamber by the first driving inclined plane 20 on the first driving plate 2; the second drive plate 4 may deliver fluid from the second inlet 30 through the second chamber to the second outlet 31.

As shown in fig. 3 and 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, the first driving inclined surfaces 20 and the second driving inclined surfaces 40 are provided in plurality, the plurality of first driving inclined surfaces 20 are arranged at intervals, and the plurality of second driving inclined surfaces 40 are arranged at intervals; the first connecting surface 21 is connected with two adjacent first driving inclined surfaces 20 and is in an N shape after being connected; the second connecting surface 41 connects two adjacent second driving slopes 40, and is in an N shape after being connected.

The double-cavity asynchronous suction-discharge type piezoelectric pump further comprises a first inlet valve 61, a second inlet valve 62, a first outlet valve 63 and a second outlet valve 64, wherein the first inlet valve 61 is arranged in the first inlet 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.

As shown in fig. 6 and 7, the first intake valve 61, the second intake valve 62, the first outlet valve 63, and the second outlet valve 64 are all check valves. The one-way valve comprises an openable and closable valve head 610 and a channel 611 which can communicate with the valve head 610, the valve head 610 comprises a plurality of movable blocks 6100; the movable block 6100 may block the channel 611. The valve head 610 can open and close according to the pressure of the fluid, when the fluid flows to the valve head 610 from the channel 611, the movable blocks 6100 are mutually opened under the extrusion of the fluid, so that the fluid flows through the one-way valve; when fluid flows from the movable block 6100 side to the channel 611, the pressure perpendicular to the movable block 6100 generated by the fluid causes the movable blocks 6100 to move toward each other, and the valve head 610 closes, thereby preventing the fluid from flowing through the one-way valve; this check valve realizes opening and shutting of valve head 610 through opening and drawing in of each movable block 6100, and valve head 610 opens and shuts smoothly, and under the fluid action, the check valve leakproofness is good.

As shown in fig. 3 and 8, the dual-cavity asynchronous suction and discharge type piezoelectric pump further comprises a housing 7, the housing has a containing cavity 72, an inlet cavity 73 and an outlet cavity 74, and the inlet cavity 73 and the outlet cavity 74 are respectively communicated with two ends of the containing cavity 72; the first pump body 1 and the second pump body 3 are accommodated in the accommodating cavity 72, i.e. the piezoelectric pump forms a closed whole; the first inlet 10 and the second inlet 30 are both communicated with the inlet cavity 73, fluid is collected in the inlet cavity 73 through the first inlet 10 and the second inlet 30, the first outlet 11 and the second outlet 31 are both communicated with the outlet cavity 74, and fluid is collected in the outlet cavity 74 through the first outlet 11 and the second outlet 31; and the inlet chamber 73 and the outlet chamber 74 are tapered to facilitate fluid collection. A third inlet 75 and a third outlet 76 are formed in the housing 7, the third inlet 75 is communicated with the inlet chamber 73, the third outlet 76 is communicated with the outlet chamber 74, and fluid is input and output from the outside through the third inlet 75 and the third outlet 76.

The working principle of the invention is as follows: the piezoelectric pump is composed of a shell 7, a first pump body 1 and a second pump body 2 contained in the shell 7, and the like; when the device is used, external inflow and outflow pipelines are respectively connected with a third inflow port 75 and a third outflow port 76 on the shell 7, fluid enters the inflow cavity 73 through the third inflow port 75 and then enters the first chamber 100 and the second chamber 200 through the first inflow port 10 and the second inflow port 30, the first drive plate 2 and the second drive plate 4 vibrate under the action of the piezoelectric plate 5, so that the fluid is pushed to the first outflow port 11 from the first inflow port 10 side and pushed to the second outflow port 31 from the second inflow port 30 side, and then enters the outflow cavity 74 through the first outflow port 11 and the second outflow port 31 and is discharged through the third outflow port 76; the piezoelectric sheet 5 vibrates the first and second driving plates 2 and 4 upward or downward, respectively, and when fluid is sucked into the first chamber 100 from the first inlet 10, the fluid in the second chamber 200 is discharged from the second outlet 31; when the fluid is sucked into the second chamber 200 from the second inlet 30, the fluid in the first chamber 100 is discharged from the first outlet 10, the continuous transmission of the fluid can be realized in the whole process, the output pressure of the fluid is increased, and the fluid transmission efficiency is improved.

As shown in fig. 5 and 9, when the piezoelectric sheet 5 moves upwards, the first driving inclined surface 20 on the first driving plate 2 generates a force F1 perpendicular to the first driving inclined surface 20, and under the action of the force F1, the fluid above the first driving inclined surface 20 generates an acceleration a1 perpendicular to the first driving inclined surface 20, and the acceleration a1 can be decomposed into an acceleration a3 in the horizontal direction and an acceleration a2 in the vertical direction. When the fluid has an upward acceleration, the inner wall of the first pump body 1 generates a downward force F2, and the accelerations a2' and a2 of the fluid in F2 cancel each other out. So that the fluid as a whole is subjected to only the force F3 in the horizontal direction, the first driving ramp 20 thereby increases the flow rate of the fluid. When the piezoelectric sheet 5 moves downward, the second drive plate 4 is stressed as above.

As shown in fig. 5, the piezoelectric pump further comprises a connecting piece 6, the first driving plate 2 is connected with the piezoelectric sheet 5 through the connecting piece 6, and the second driving plate 4 is connected with the piezoelectric sheet 5 through the connecting piece 6; and the link 6 is connected to the bottom of the first driving ramp 20 or the second driving ramp 40. The connecting piece 6 has certain elasticity, can effectively prevent the first driving plate 2, the second driving plate 4 and the piezoelectric sheet 5 from being worn, and ensures that the first driving plate 2 and the second driving plate 4 respectively vibrate along with the piezoelectric sheet 5.

In this embodiment, the pump further includes a sealing ring (not shown in the drawings), the piezoelectric sheet 5 is disposed between the first pump body 1 and the second pump body 3, a first groove 12 is disposed on the first pump body 1 along the circumferential direction thereof, a second groove 32 is disposed on the second pump body 3 along the circumferential direction thereof, and the sealing ring is disposed in the first groove 12 and the second groove 32; and both sides of the piezoelectric sheet 5 are abutted against the sealing ring. That is, the piezoelectric plate 5 is fixed in the housing 7 through the first pump body 1 and the second pump body 3, and the upper and lower sides of the piezoelectric plate 5 are both provided with the sealing rings, so that fluid can be prevented from entering between the first drive plate 2 and the piezoelectric plate 5 or between the second drive plate 4 and the piezoelectric plate 5, and the fluid is prevented from contacting with the piezoelectric plate 5.

As shown in fig. 1 to 3, the housing 7 includes a first housing 70 and a second housing 71, and the first housing 70 is detachably connected to the second housing 71 to facilitate mounting of the first pump body 1 and the second pump body 3, and the like. The electric wire 8 penetrates through the shell 7 to be connected with the piezoelectric sheet 5, and the inner wall of the shell 7 has a gap with the first pump body 1 and the second pump body 3, so that the arrangement of the electric wire 8 is facilitated.

In the scheme, the double-cavity asynchronous suction and discharge type piezoelectric pump increases the flow rate of fluid through the driving plate with the driving inclined plane, improves the fluid transmission efficiency, and has a simple structure and convenient manufacture; the piezoelectric pump is provided with two chambers, and the two chambers alternately suck and discharge fluid under the action of the piezoelectric sheet, so that the continuous transmission of the fluid is ensured; the whole piezoelectric pump is connected with the outside only through the inlet and the outlet on the shell, and is convenient to use.

It should be noted that all directional indicators (such as up, down, left, right, front, back \8230;) in the embodiments of the present invention are only used to explain the relative positional relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

Furthermore, descriptions of the present invention as related to "first," "second," "a," etc. are for descriptive purposes only and are not to be construed as indicating or implying relative importance or to imply that the number of technical features indicated is indicative. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.

In the present invention, unless otherwise explicitly stated or limited, the terms "connected", "fixed", and the like are to be understood broadly, for example, "fixed" may be fixedly connected, may be detachably connected, or may be integrated; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

Claims

1. The utility model provides a two-chamber asynchronous suction-discharge formula piezoelectric pump which characterized in that, including:

the pump comprises a first pump body and a first drive plate which are connected, wherein the first pump body and the first drive plate surround to form a first cavity; a first inlet and a first outlet are arranged on the first pump body; the first driving plate is provided with a first driving inclined surface which is gradually inclined downwards from the first inflow port side to the first outflow port side;

the second pump body and the second driving plate are connected and surround to form a second cavity; a second inlet and a second outlet are arranged on the second pump body; the second driving inclined plane is arranged on the second driving plate and gradually inclines upwards from the second flow inlet side to the second flow outlet side;

a piezoelectric sheet connecting the first drive plate and the second drive plate, wherein the first drive plate can convey fluid from the first inlet to the first outlet through the first chamber; the second drive plate can convey fluid from the second inlet through the second chamber to the second outlet;

the first driving plate is provided with a first connecting surface, the second driving plate is provided with a second connecting surface, and the first driving inclined surfaces and the second driving inclined surfaces are provided with a plurality of driving inclined surfaces; the first connecting surface is connected with two adjacent first driving inclined surfaces to form an N shape, and the second connecting surface is connected with two adjacent second driving inclined surfaces to form an N shape.

2. The dual-cavity asynchronous suction and discharge type piezoelectric pump according to claim 1, further comprising a first inlet valve disposed in the first inlet port, a second inlet valve disposed in the second inlet port, a first outlet valve disposed in the first outlet port, and a second outlet valve disposed in the second outlet port.

3. The dual-cavity asynchronous suction and discharge type 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 one-way valves.

4. The dual-cavity asynchronous suction and discharge type piezoelectric pump according to claim 3, wherein the one-way valve comprises an openable and closable valve head and a channel communicated with the valve head, and the valve head comprises a plurality of movable blocks; the movable block can block the channel.

5. The dual-cavity asynchronous suction and discharge type piezoelectric pump as claimed in claim 1, further comprising a connecting member, wherein the first driving plate and the piezoelectric sheet are connected through the connecting member, and the second driving plate and the piezoelectric sheet are connected through the connecting member; and the connecting piece is connected to the bottom of the first driving inclined plane or the second driving inclined plane.

6. The dual-cavity asynchronous suction and discharge type piezoelectric pump according to claim 1, further comprising a sealing ring, wherein the piezoelectric sheet is disposed between the first pump body and the second pump body, the first pump body is provided with a first groove along a circumferential direction thereof, the second pump body is provided with a second groove along a circumferential direction thereof, and the sealing ring is disposed in the first groove and the second groove respectively; and the two sides of the piezoelectric piece are abutted to the sealing ring.

7. The dual-cavity asynchronous suction and discharge type piezoelectric pump according to claim 1, further comprising a housing, wherein the housing has a containing cavity, an inflow cavity and an outflow cavity, and the inflow cavity and the outflow cavity are respectively communicated with two ends of the containing cavity;

8. The dual-cavity asynchronous suction and discharge type piezoelectric pump according to claim 7, wherein the housing defines a third inlet and a third outlet, the third inlet is in communication with the inlet cavity, and the third outlet is in communication with the outlet cavity.

9. The dual-cavity asynchronous suction and discharge type piezoelectric pump according to claim 7, wherein the housing comprises a first housing and a second housing, and the first housing is detachably connected with the second housing.