CN220285943U - Miniature piezoelectric pump - Google Patents

Abstract

The application provides a miniature piezoelectric pump, which comprises a shell and an actuating device arranged in the shell, wherein the shell is provided with a fluid inlet and a fluid outlet, and the actuating device acts to drive fluid to be conveyed from the fluid inlet to the fluid outlet; wherein the micro piezoelectric pump further comprises a filter arranged at the fluid inlet, the filter being adapted to filter the fluid before the fluid flows through the actuation means. The miniature piezoelectric pump that this application provided from taking filtering capability, reducible part quantity, reduction assembly complexity and solve the sealed bad problem when assembling.

Description

Miniature piezoelectric pump

Technical Field

The application relates to the technical field of fluid transportation, in particular to a miniature piezoelectric pump.

Background

The miniature piezoelectric pump is one fluid conveying device with small volume, high precision and high internal structure and parts for conveying airflow or water flow. The fluid inlet hole, the fluid outlet hole and the internal fluid channel of the micro piezoelectric pump are usually very tiny, and if the sucked fluid is not clean enough, the inlet hole and the channel are easily blocked, so that the micro piezoelectric pump is disabled. Thus, the fluid entering the micro piezoelectric pump needs to be relatively clean.

The micro piezoelectric pump in the prior art generally has no filtering function, and the fluid entering the micro piezoelectric pump can only be the fluid purified in advance. That is, a filtering device is usually required to be arranged at the upstream of the micro piezoelectric pump, thus complicating components and having high requirements on tightness of assembly, and increasing cost and assembly difficulty.

In view of this, a new solution is needed to overcome the above-mentioned drawbacks.

Disclosure of Invention

The application provides a miniature piezoelectric pump, from taking filtering capability.

In order to achieve the above purpose, the present application adopts the following technical scheme: a micro piezoelectric pump comprising a housing having a fluid inlet and a fluid outlet, and an actuation device disposed within the housing, the actuation device acting to drive fluid delivery from the fluid inlet to the fluid outlet; wherein the micro piezoelectric pump further comprises a filter arranged at the fluid inlet, the filter being adapted to filter the fluid before the fluid flows through the actuation means.

Optionally, the filter is sealingly connected to an edge of the fluid inlet.

Optionally, the micro-piezoelectric pump comprises a crimp, the filter comprising a flexible crimp edge; wherein,

the crimping edges are extruded on the crimping pieces through the crimping pieces to form sealing connection; and/or the number of the groups of groups,

the crimping edge is adhered to the crimping piece through colloid to form sealing connection.

Optionally, the filter element is filter cotton, and a plurality of micro air holes are formed in the filter element.

Optionally, the micro piezoelectric pump further comprises a support member for supporting the filter member, and the support member is provided with a through hole for the fluid to pass through.

Optionally, the filter is crimped between the crimp and the support.

Optionally, the support member is adhesively secured to the housing.

Optionally, the crimping member is a sheet metal ring, and the support member is a sheet metal.

Optionally, the actuating device includes a piezoelectric element, a vibration plate driven to vibrate by the piezoelectric element, and a resonance plate disposed at a distance from the vibration plate, and a chamber is formed between the resonance plate and the vibration plate.

Optionally, the resonance plate includes a plurality of cantilever pins supported by the housing, and the resonance plate is elastically and vibratingly configured in the housing through the cantilever pins.

Optionally, the shell includes the lateral wall, offer on the lateral wall and supply the mounting groove of cantilever pin installation, install in the mounting groove and pack the chock of mounting groove.

The miniature piezoelectric pump that this application provided includes the casing and locates actuating device in the casing, the casing has fluid inlet and fluid outlet, and fluid inlet department is furnished with the filter, the filter is suitable for before the fluid flows through actuating device, to fluid filtration, through setting up miniature piezoelectric pump from taking the filter for miniature piezoelectric pump can directly use in the fluid that has not purified, and need not assemble filter in miniature piezoelectric pump's the upper reaches, reduced part quantity and assembly complexity and avoided the poor problem of sealing when assembling like this.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following brief description of the drawings of the embodiments will make it apparent that the drawings in the following description relate only to some embodiments of the present application and are not limiting of the present application.

FIG. 1 is a perspective view of one embodiment of a micro piezoelectric pump of the present application.

FIG. 2 is a perspective view of another perspective assembly of an embodiment of a micro piezoelectric pump of the present application.

Fig. 3 is an exploded perspective view of one embodiment of a micro piezoelectric pump of the present application.

Fig. 4 is another exploded perspective view of one embodiment of a micro piezoelectric pump of the present application.

Fig. 5 is a cross-sectional view taken along line A-A of fig. 1.

Fig. 6 is a sectional view taken along line B-B of fig. 1.

Fig. 7 is a schematic diagram of the suction process of the micro piezoelectric pump of the present application.

Fig. 8 is a schematic diagram of the venting process of the micro piezoelectric pump of the present application.

Reference numerals illustrate: 100-micro piezoelectric pump; 1-a housing; 101-a fluid inlet; 102-fluid outlet; 103-chamber; 11-sidewalls; 111-lugs; 110-mounting slots; 12-plugs; 2-a filter; 201-micro air holes; 21-crimping the piece; 22-a support; 220-through holes; 3-actuating means; 31-a piezoelectric element; 32-a vibrating plate; 33-a compression ring; 34-spacer rings; 35-a resonator plate; 350-air holes; 351—cantilever pins; 36-electrode.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

Unless defined otherwise, technical or scientific terms used in this patent document should be given the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. The terms "first," "second," and the like in the description and in the claims, are not used for any order, quantity, or importance, but are used for distinguishing between different elements. Likewise, the terms "a," "an," or "the" and similar terms do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprising" or "comprises", and the like, is intended to mean that elements or items that are present in front of "comprising" or "comprising" are included in the word "comprising" or "comprising", and equivalents thereof, without excluding other elements or items. "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used merely to denote relative positional relationships, which may also change accordingly when the absolute position of the object being described changes, merely to facilitate description of the present application and simplify description, and do not indicate or imply that the apparatus or elements being referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the present application.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.

Some embodiments of the present application are described in detail below with reference to the accompanying drawings. Features of the embodiments described below may be combined with each other without conflict.

Referring to fig. 1-6, a micro piezoelectric pump 100 is provided. In an embodiment, the micro piezoelectric pump 100 comprises a housing 1 and an actuating device 3 arranged in the housing 1, the housing 1 has a fluid inlet 101 and a fluid outlet 102, and the actuating device 3 acts to drive the fluid to be transported from the fluid inlet 101 to the fluid outlet 102. Wherein the micro piezoelectric pump 100 further comprises a filter element 2 arranged at the fluid inlet 101, the filter element 2 being adapted to filter the fluid before the fluid flows through the actuation means 3. The fluid may be a liquid or a gas.

Referring to fig. 3 to 5, the housing 1 may be a plastic member, and has a circular shape as a whole, and a bottom wall and an annular side wall 11 extending from an edge of the bottom wall, and the upper portion of the housing 1 is open or at least a partial area of the upper portion is open to form the fluid inlet 101. The bottom wall of the housing 1 is provided with a fluid outlet 102, and in this embodiment, the fluid outlet 102 is a small hole that is far smaller than the fluid inlet 101, so that the fluid discharged by the micro piezoelectric pump 100 has higher pressure and speed.

A plurality of mounting grooves 110 are formed in the inner side surface of the side wall 11 of the shell 1, the cross section of each mounting groove 110 is T-shaped, each mounting groove 110 extends from top to bottom, the upper end of each mounting groove penetrates through the upper surface of the side wall 11, and the lower end of each mounting groove does not penetrate through the lower surface of the side wall 11; the mounting groove 110 is used for mounting the cantilever pin 351 of the resonator plate 35 so that the cantilever pin 351 can be fitted into the mounting groove 110 from top to bottom and the cantilever pin 351 is restrained in the mounting groove 110. In this embodiment, the number of the mounting grooves 110 is 4, and the side walls 11 are uniformly distributed. A plug 12 filling the mounting groove 110 is further installed in the mounting groove 110, and the plug 12 is used for being plugged in the mounting groove 110 to compress the cantilever pin 351 and fill the mounting groove 110 to facilitate the installation of other components after the cantilever pin 351 is installed in the mounting groove 110. The shape of the plug 12 matches the shape of the mounting groove 110, and the cross section thereof is T-shaped. The side wall 11 of the housing 1 is further provided with a ledge 111 extending outwards for supporting the electrode 36 for connection of the electrode 36 to an external power supply.

With continued reference to fig. 3 to 5, in the present embodiment, the actuating device 3 is a device that uses a piezoelectric effect to perform an action. Specifically, the actuator 3 includes a piezoelectric element 31, a vibration plate 32 driven to vibrate by the piezoelectric element 31, and a resonance plate 35 disposed at a distance from the vibration plate 32, and a chamber 103 is formed between the resonance plate 35 and the vibration plate 32. The vibration plate 32 is a metal sheet, the piezoelectric element 31 is connected to the middle position of the vibration plate 32, and the piezoelectric element 31 drives the middle of the vibration plate 32 of the metal sheet to bulge, flatten, swell and flatten due to the piezoelectric effect after being subjected to the changed voltage, so that the air blowing is repeatedly realized, the air flow enters the cavity 103, and the resonance plate 35 is driven to vibrate, so that the air flow is discharged from the fluid outlet 102. A spacer ring 34 is arranged between the resonance plate 35 and the vibration plate 32, the edge of the vibration plate 32 is supported on the spacer ring 34 and is fixed with the spacer ring 34 through double faced adhesive tape, the upper part of the edge of the vibration plate 32 is fixed by compression joint of the compression ring 33, and the upper surface of the edge of the vibration plate 32 is also fixed by double faced adhesive tape connection with the compression ring 33. The resonance plate 35 is a metal sheet, and includes a plurality of cantilever pins 351 supported on the housing 1, and the resonance plate 35 is elastically and vibratably disposed in the housing 1 through the cantilever pins 351, so that the resonance plate 35 can elastically vibrate. The resonance plate 35 is provided with an air hole 350, and the air hole 350 is opposite to the fluid outlet 102 on the bottom wall of the housing 1.

With continued reference to fig. 3-5, in this embodiment, the filter element 2 is sealingly connected to the edge of the fluid inlet 101. Specifically, the micro piezoelectric pump 100 includes a crimping member 21, and the filter element 2 includes a flexible crimping edge; in an embodiment, the pressing edge is pressed on the pressing edge by the pressing piece 21 to form sealing connection, and the pressing piece 21 is installed in a pressing mode by means of elastic buckling, screws, rotary buckling and the like; in another embodiment, the crimp edge is adhesively bonded to the crimp 21 to form a sealed connection. The press-connection edge of the filter element 2 is flexible, so that the sealing connection is convenient to realize. In this embodiment, the filter element 2 is a filter cotton, and a plurality of micro air holes 201 are formed thereon. In some embodiments, the micro air holes 201 may not be formed on the filter cotton, but the air flow is realized through the fiber gaps between the filter cotton; i.e. it is configured to allow the passage of fluid while filtering impurities. Further, the micro piezoelectric pump 100 further includes a supporting member 22 for supporting the filter element 2, where the supporting member 22 may play a supporting role to prevent the flexible filter element 2 such as filter cotton from collapsing when the fluid passes through. In this embodiment, the supporting member 22 is a thin plate with a shape matching that of the filtering member 2, and is disposed below the filtering member 2, that is, disposed at a surface of the filtering member 2 opposite to the air inlet surface, and the supporting member 22 is provided with a through hole 220 for the fluid to pass through. The size of the through hole 220 is much larger than the size of the micro air hole 201 on the filter 2 to reduce the blocking of the fluid; the size of the through-hole 220 is preferably not too large to impair its supporting function. In this embodiment, the pressing member 21 is a sheet-shaped metal ring, and the supporting member 22 is a metal sheet. In this embodiment, the supporting member 22 is adhesively fixed to the housing 1, the supporting member 22 is supported on the side wall 11 of the housing 1 and the top surface of the plug 12, and the filter element 2 is crimped between the crimping member 21 and the supporting member 22.

Referring to fig. 6, the actuating device 3 includes a pressing ring 33, a vibrating plate 32, a spacer ring 34, and a resonant plate 35, which have a gap with the inner wall surface of the sidewall 11 of the housing 1, and the gas filtered by the filter 2 passes through the gap and is finally discharged from the fluid outlet 102 on the bottom wall of the housing 1, as indicated by the arrow in fig. 6. Referring to fig. 7 and 8 together, schematic diagrams of the suction and discharge processes are shown, and in order to clearly show the operation states of the vibration plate 32 and the resonance plate 35 and the airflow direction during suction and discharge, the components shown in fig. 7 and 8 are not drawn to scale, and at the same time, some of the components are omitted. As shown in fig. 7, during the air suction process, the vibration plate 32 and the resonance plate 35 are bent, an expansion cavity is formed between the vibration plate 32 and the resonance plate 35, the air flows into the shell 1 after being filtered by the filter 2 and flows around, and flows through the gap between the actuating device 3 and the shell 1, and part of the air flows into the cavity 103 through the air holes 350 of the resonance plate 35, and the air is discharged through the fluid outlet 102 of the shell 1; in the exhaust process, as shown in fig. 8, the vibration plate 32 and the resonance plate 35 are bent to form a compression chamber therebetween, the gas flows into the housing 1 after being filtered by the filter 2 as shown by arrows in the figure, flows around, flows through the gap between the actuator 3 and the housing 1, is discharged from the fluid outlet 102, and the gas in the chamber 103 is also discharged from the chamber 103 under compression.

The connection relationship of an embodiment of the micro piezoelectric pump 100 is as follows: the resonance plate 35 is installed in the shell 1, and the cantilever pins 351 of the resonance plate 35 are installed in the installation grooves 110 of the shell 1; the plug 12 is plugged into the mounting groove 110 to compress the cantilever pins 351; the actuating device 3 composed of the piezoelectric element 31, the vibration plate 32, the compression ring 33 and the spacer ring 34 is mounted on the resonance plate 35, the piezoelectric element 31 is connected to the power supply device through the electrode 36, and a cavity 103 is formed between the vibration plate 32 and the resonance plate 35; the supporting member 22, the filter element 2 and the pressing member 21 are sequentially supported on the upper end surface formed by the side wall 11 of the housing 1 and the plug 12 and are fixedly connected. In use, the power supply device provides voltage to the piezoelectric element 31, and the piezoelectric element 31 drives the vibration plate 32 to vibrate, so that air flows through the filter element 2 into the housing 1 and is discharged from the fluid outlet 102.

As can be seen from the above description of the specific embodiments, the micro-piezoelectric pump 100 provided in the present application includes a housing 1 and an actuating device 3 disposed in the housing 1, the housing 1 has a fluid inlet 101 and a fluid outlet 102, a filter 2 is disposed at the fluid inlet 101, the filter 2 is adapted to filter the fluid before the fluid flows through the actuating device 3, and by providing the micro-piezoelectric pump 100 with the filter 2, the micro-piezoelectric pump 100 can be directly used in the unpurified fluid without assembling the filter upstream of the micro-piezoelectric pump 100, so as to reduce the number of parts, assembly complexity, and poor sealing during assembly.

The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions easily conceivable by those skilled in the art within the technical scope of the present application should be covered in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (11)

1. A micro piezoelectric pump comprising a housing having a fluid inlet and a fluid outlet, and an actuation device disposed within the housing, the actuation device acting to drive fluid delivery from the fluid inlet to the fluid outlet; wherein the micro piezoelectric pump further comprises a filter element arranged at the fluid inlet, the filter element being adapted to filter the fluid before the fluid flows through the actuation means.

2. The micro piezoelectric pump of claim 1, wherein the filter is sealingly connected to an edge of the fluid inlet.

3. The micro piezoelectric pump of claim 2, wherein the micro piezoelectric pump comprises a crimp, the filter comprising a flexible crimp edge; wherein,

the crimping edges are extruded on the crimping pieces through the crimping pieces to form sealing connection; and/or the number of the groups of groups,

the crimping edge is adhered to the crimping piece through colloid to form sealing connection.

4. The micro piezoelectric pump of claim 3, wherein the filter member is filter cotton with a plurality of micro air holes.

5. The micro-piezoelectric pump according to claim 3 or 4, further comprising a support member for supporting the filter member, the support member being provided with a through hole for the fluid to pass through.

6. The micro piezoelectric pump of claim 5, wherein the filter is crimped between the crimp and the support.

7. The micro piezoelectric pump of claim 6, wherein the support member is adhesively secured to the housing.

8. The micro piezoelectric pump of claim 5, wherein the press-fit member is a sheet metal ring and the support member is a sheet metal.

9. The micro piezoelectric pump of claim 1, wherein the actuating means comprises a piezoelectric element, a vibration plate driven to vibrate by the piezoelectric element, and a resonance plate disposed at a distance from the vibration plate, a chamber being formed between the resonance plate and the vibration plate.

10. The micro piezoelectric pump of claim 9, wherein the resonator plate comprises a plurality of cantilever pins supported by the housing, the resonator plate being elastically vibratable within the housing via the cantilever pins.

11. The micro piezoelectric pump of claim 10, wherein the housing comprises a side wall, wherein the side wall is provided with a mounting groove for mounting the cantilever pin, and a plug for filling the mounting groove is mounted in the mounting groove.