CN221120244U - Pump core of piezoelectric pump - Google Patents

Abstract

The utility model relates to a piezoelectric pump core, which is stacked and connected in sequence from the distal end to the proximal end with a control component, a vibration component, and a valve component; a part of the control component is energized to generate flexural vibration, and drives a part of the vibration component to elastically deform and squeeze the working chamber to pump fluid to the valve component; the vibration component is stacked in sequence from the distal end to the proximal end with a first support plate, a support ring, and a second support plate; a plurality of first through holes are provided on the first support plate; the support ring has a hollow structure; a plurality of second through holes are provided on the second support plate; wherein, the first support plate, the support ring, and the second support plate enclose the working chamber, the aperture of the distal end of the first through hole is larger than the aperture of the proximal end of the first through hole, when the aperture of the proximal end remains unchanged, the aperture of the distal end increases, and the intake pressure and rate increase, thereby facilitating the purpose of increasing the pumping pressure of the piezoelectric pump.

Description

A piezoelectric pump core

Technical Field

The utility model relates to the technical field of piezoelectric pumps, in particular to a pump core of a piezoelectric pump.

Background technique

A piezoelectric pump, also known as a piezoelectric ceramic pump, is a pump structure that utilizes the inverse piezoelectric effect of piezoelectric ceramics to deform a piezoelectric vibrator. The deformation causes the volume of the pump chamber to change to achieve air pressure pumping, and/or utilizes the piezoelectric vibrator to generate fluctuations to transmit fluid. It can achieve fluid transmission without the need for an additional drive motor and is widely used in aerospace, robotics, automobiles, medical equipment, biogenetic engineering, micro-machinery and other fields, such as medical ventilators.

The currently commonly used piezoelectric pump structure has an air inlet on one side of the pump body and an air outlet on the other side. The drive component is installed in the pump body. The volume of the pump chamber changes through the deformation of the drive component, so that the gas enters the exhaust chamber from the air inlet chamber along the surrounding flow channels and is then discharged through the air outlet.

The Chinese invention patent application with document number CN115479018A discloses a pump core and a micro air pump for an air pump, the pump core comprising a drive assembly, a valve plate, a drive assembly mounting assembly, a valve plate mounting assembly, a positive electrode plate, and a negative electrode plate, the drive assembly being mounted on the top of the drive assembly mounting assembly, the valve plate being mounted in the middle of the valve plate mounting assembly, the bottom end of the drive assembly mounting assembly being fixedly connected to the top of the valve plate mounting assembly; the positive electrode plate being fixedly connected to the drive assembly, and the negative electrode plate being fixedly connected to the valve plate mounting assembly; the valve plate being an elastic plate, the valve plate being elastically mounted in the valve plate mounting assembly, the micro air pump comprising a pump body which is hollow inside and open at the top, an air inlet, an air outlet, a pump core mounted in the pump body, and a cover body covering the open top of the pump body, the pump core comprising a drive assembly and a valve plate, the drive assembly being mounted in the pump body through the drive assembly mounting assembly, and the valve plate being mounted in the pump body through the valve plate mounting assembly. In this technical solution, the first through hole of the first support plate adopts a conventional vertical through hole. The inner diameters of the vertical through hole are the same at the upper and lower ends. No pressure difference will be formed between the fluids at the upper and lower ends of the vertical through hole, making it difficult for the vertical through hole to achieve the purpose of increasing the pumping pressure of the piezoelectric pump.

Utility Model Content

In view of the shortcomings of the above-mentioned prior art, the purpose of the utility model is to provide a piezoelectric pump core. By setting the first through hole on the first support plate to a shape in which the distal aperture is larger than the proximal aperture, a pressure difference is formed when the airflow passes through the two through holes, thereby facilitating the purpose of increasing the pumping pressure of the piezoelectric pump.

To achieve the above purpose, the technical solution of the utility model is as follows:

A piezoelectric pump core, the piezoelectric pump core comprising a control component, a vibration component, and a valve component; the control component is arranged at the distal end of the vibration component, and the valve component is arranged at the proximal end of the vibration component;

The vibration assembly is stacked in sequence from the distal end to the proximal end with a first support plate, a support ring, and a second support plate; a plurality of first through holes are provided on the first support plate; the support ring has a hollow structure; a plurality of second through holes are provided on the second support plate; wherein the first support plate, the support ring, and the second support plate enclose a working cavity, and the aperture of the distal end of the first through hole is larger than the aperture of the proximal end of the first through hole;

The valve assembly is in communication with the second through hole and is capable of controlling the opening and closing of the second through hole;

A portion of the control component is energized to generate buckling vibration, and drives a portion of the vibration component to elastically deform and squeeze the working chamber, so as to pump fluid to the valve component.

Furthermore, the first through hole includes a first hole and a second hole opened at the proximal end of the first hole, the aperture of the first hole is larger than the aperture of the second hole, and the first hole is connected to the second hole.

Furthermore, the control component includes a positive electrode sheet, a piezoelectric ceramic sheet, and a negative electrode sheet. The positive electrode sheet is arranged at the distal end of the piezoelectric ceramic sheet, the piezoelectric ceramic sheet is arranged at the distal end of the first support plate, and the negative electrode sheet is arranged at the proximal end of the valve assembly.

Furthermore, the positive electrode sheet is flexibly connected to the distal end of the piezoelectric ceramic sheet, and the negative electrode sheet is flexibly connected to the proximal end of the valve assembly.

Furthermore, a plurality of third through holes are formed at the distal end of the valve assembly, and the third through holes are opposite to the second through holes; a valve sheet is arranged in the valve assembly, and the valve sheet is an elastic sheet, and the valve sheet is maintained to be elastically deformed in the valve assembly; a plurality of fourth through holes are formed on the valve sheet, and the fourth through holes are not opposite to the third through holes; a plurality of fifth through holes are formed at the proximal end of the valve assembly, and the fifth through holes are opposite to the fourth through holes.

Furthermore, the valve assembly is stacked with a valve cover, a valve seat, and a valve plate in sequence from the distal end to the proximal end; the third through hole is opened on the valve cover; the fifth through hole is opened on the valve seat, and a valve chamber is formed between the valve cover and the valve seat; the valve plate is maintained to be able to elastically deform in the valve chamber.

Compared with the prior art, the beneficial technical effects of the utility model are as follows:

(1) The piezoelectric pump core of the utility model is provided with a plurality of first through holes at the far end of the vibration component and located outside the driving component. The first through holes are connected to the air inlet of the piezoelectric pump. The far end aperture of the first through hole is larger than the near end aperture of the first through hole. When the near end aperture remains unchanged, the far end aperture increases, and the air intake pressure and rate increase, thereby achieving the purpose of increasing the pumping pressure of the piezoelectric pump.

(ii) Furthermore, the positive electrode sheet is flexibly connected to the driving component, and the negative electrode sheet is flexibly connected to the valve seat. The positive electrode sheet and the negative electrode sheet are made of flexible conductive materials, which reduces the possibility of the pump core being disconnected from the positive electrode sheet and the negative electrode sheet due to vibration of the driving component, thereby facilitating the purpose of increasing the service life of the piezoelectric pump.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows an exploded isometric view of a piezoelectric pump core of the utility model.

FIG. 2 shows a schematic top view of the structure of a piezoelectric pump core of the utility model.

FIG3 shows a cross-sectional view of a piezoelectric pump core of the utility model.

FIG. 4 shows an enlarged view of point A in FIG. 3 .

FIG. 5 shows an enlarged view of point A in FIG. 3 .

Markings in the accompanying drawings:

1. Control component; 11. Positive electrode sheet; 12. Negative electrode sheet; 13. Piezoelectric ceramic sheet; 2. Vibration component; 21. First support plate; 211. First through hole; 2111. First hole; 2112. Second hole; 22. Support ring; 221. Working chamber; 23. Second support plate; 231. Second through hole; 3. Valve component; 31. Valve cover; 311. Third through hole; 32. Valve sheet; 321. Fourth through hole; 33. Valve seat; 331. Fifth through hole.

Detailed ways

In order to make the purpose, features and advantages of the utility model more obvious and easy to understand, please refer to the attached drawings. It should be noted that the structures, proportions, sizes, etc. illustrated in the attached drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no technical substantive significance. Any modification of the structure, change of the proportion relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the utility model without affecting the effect and purpose that can be achieved by the utility model.

In the description of the present invention, the orientations or positional relationships indicated by terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "axial", "radial", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

In order to more clearly describe the structure of the above-mentioned piezoelectric pump core, the utility model defines the terms "distal end" and "proximal end". Specifically, the "distal end" refers to the end away from the ground, and the "proximal end" refers to the end close to the ground. Taking Figure 1 as an example, the lower end of the valve assembly 3 in Figure 1 is the proximal end, and the upper end of the valve assembly 3 in Figure 1 is the distal end.

Embodiment 1

Figure 1 shows a schematic diagram of the exploded structure of a piezoelectric pump core of the utility model. Figure 2 shows a schematic diagram of the top view of a piezoelectric pump core of the utility model. Figure 3 shows a cross-sectional view of a piezoelectric pump core of the utility model. Figure 4 shows an enlarged view of A in Figure 3.

As shown in Figures 1 to 4, a piezoelectric pump core, the fluid control device sequentially stacks a control component 1, a vibration component 2, and a valve component 3 from the distal end to the proximal end. Specifically, the control component 1, the vibration component 2, and the valve component 3 are bonded in a mutually stacked state.

Further, the vibration assembly 2 is stacked in sequence from the distal end to the proximal end with a first support plate 21, a support ring 22, and a second support plate 23. The first support plate 21 is provided with a plurality of first through holes 211. The support ring 22 has a hollow structure. The second support plate 23 is provided with a plurality of second through holes 231. The first support plate 21, the support ring 22, and the second support plate 23 enclose a working cavity 221, and the working cavity 221 is connected with the first through hole 211 and the second through hole 231. The aperture of the distal end of the first through hole 211 is larger than the aperture of the proximal end of the first through hole 211.

Exemplarily, the first support plate 21 and the second support plate 23 are both disc-shaped, the support ring 22 is annular, and the first through holes 211 are arranged in annular intervals around the outer circumference of the piezoelectric element. The piezoelectric element is attached to the circumference of the first through holes 211, and the diameter of the circumscribed circle formed by all the first through holes 211 is smaller than the inner diameter of the support ring 22. The piezoelectric element, the first support plate 21, the support ring 22, and the second support plate 23 are coaxially arranged.

Preferably, the first through hole 211 is a tapered hole. Of course, in other embodiments of the present invention, the first through hole 211 may also be an arc-shaped hole or other shapes, as long as the distal hole diameter is greater than the proximal hole diameter and the strength of the first support plate 21 at the first through hole 211 is guaranteed, and the present invention does not impose any further restrictions on this.

Further, the control assembly includes a positive electrode sheet 11, a piezoelectric ceramic sheet 13, and a negative electrode sheet 12. The positive electrode sheet 11 is arranged at the distal end of the piezoelectric ceramic sheet 13, the piezoelectric ceramic sheet 13 is arranged at the distal end of the first support plate 21, and the negative electrode sheet 12 is arranged at the proximal end of the valve seat 33. The positive electrode sheet 11 and the piezoelectric ceramic sheet 13, and the negative electrode sheet 12 and the valve seat 33 can be bonded, welded, or integrally formed, as long as they can provide power to the piezoelectric ceramic sheet 13, and the utility model does not impose any further restrictions on this.

Exemplarily, electrodes are formed on the surface of the piezoelectric ceramic sheet 13 and polarized. The polarization treatment is a process in which a direct current electric field of 2 to 3 times the coercive electric field is applied to the ceramic to make the dipoles in the sintered piezoelectric ceramic align in direction, so as to make it piezoelectric.

Preferably, the positive electrode sheet 11 is flexibly connected to the piezoelectric ceramic sheet 13, and the negative electrode sheet 12 is flexibly connected to the valve seat 33, so as to prevent the vibration of the piezoelectric ceramic sheet 13 from causing the piezoelectric pump core to be disconnected from the positive electrode sheet 11 and the negative electrode sheet 12. Specifically, the positive electrode sheet 11 and the negative electrode sheet 12 are made of flexible conductive materials, such as commercially available FPC electrode tapes.

Furthermore, the valve assembly 3 is stacked with a valve cover 31, a valve plate 32, and a valve seat 33 in sequence from the distal end to the proximal end. The valve cover 31 is provided with a plurality of third through holes 311, and the third through holes 311 are opposite to the second through holes 231. The valve plate 32 is an elastic plate, and the valve plate 32 is maintained to be elastically deformed in the valve chamber 312. The valve plate 32 is provided with a plurality of fourth through holes 321, and the third through holes 311 and the fourth through holes 321 are arranged alternately, so that when the valve plate 32 is deformed and adsorbed on the valve cover 31, the third through holes 311 and the fourth through holes 321 cannot be connected. Exemplarily, glue points are added at both ends of the valve plate 32 to keep its circumferential position fixed relative to the valve cover 31 and the valve seat 33, and prevent rotation. The valve seat 33 is provided with a plurality of fifth through holes 331 , which are opposite to the fourth through holes 321 , so that when the valve plate 32 is deformed and adsorbed on the valve seat 33 , the third through hole 311 is connected to the second through hole 231 , and the fifth through hole 331 is connected to the fourth through hole 321 , so as to realize air pumping.

Preferably, the first support plate 21 , the support ring 22 , the second support plate 23 , and the valve cover 31 are made of stainless steel, and the valve seat 33 is made of copper.

The specific production process of this utility model is as follows:

When making a piezoelectric pump core, first use epoxy resin to bond and fix the drive component 2, the first support plate 21, the support ring 22, and the second support plate 23 arranged in sequence from top to bottom; secondly, use epoxy resin to bond and fix the proximal end of the second support plate 23 to the distal end of the valve cover 31; then use epoxy resin to bond and fix the proximal end of the valve cover 31 to the valve sheet 32 and the valve seat 33 in sequence; finally, weld the positive electrode sheet 11 to the drive component 2, and weld the negative electrode sheet 12 to the valve seat 33.

The specific working process of the utility model is as follows:

The positive electrode sheet 11 and the negative electrode sheet 12 supply power to the piezoelectric ceramic sheet 13, and the piezoelectric ceramic sheet 13 vibrates and deforms under the action of the electromagnetic field. When the middle of the piezoelectric ceramic sheet 13 bulges upward, it drives the vibration assembly 2, the valve assembly 3, and the valve sheet 32 to deform synchronously, so that the middle of the piezoelectric pump core bulges upward and the surroundings are concave. At this time, the middle of the valve sheet 32 bulges upward and fits with the proximal end of the valve cover 31. Since the fourth through hole 321 in the valve sheet 32 and the third through hole 311 of the valve cover 31 are arranged alternately, when the middle of the valve sheet 32 fits with the proximal end of the valve cover 31, the third through hole 311 can be blocked, so that a negative pressure is formed in the air inlet chamber (not shown in the figure) of the piezoelectric pump. At this time, the gas enters the air inlet chamber along the air inlet and enters the working chamber 221 through the first through hole 211.

When the middle of the piezoelectric ceramic plate 13 is recessed, the vibration component 2, the valve component 3 and the valve plate 32 are deformed synchronously, so that the middle of the pump core is recessed and the surrounding parts are tilted. At this time, the middle of the valve plate 32 is recessed and fits with the proximal end of the valve plate 32 mounting assembly, so that the gas temporarily stored in the working chamber 221 is compressed and enters the exhaust chamber of the piezoelectric pump (not shown in the figure) through the second through hole 231, the third through hole 311, the fourth through hole 321 and the fifth through hole 331. The gas in the exhaust chamber is discharged along the outlet of the piezoelectric pump to realize gas pressure pumping and transportation.

Embodiment 2

FIG. 5 shows an enlarged view of point A in FIG. 3 .

As shown in FIG5 , the structure and working process of the second embodiment are mostly the same as those of the first embodiment, except that the first through hole 211 includes a first hole 2111 and a second hole 2112 opened at the proximal end of the first hole 2111, the first hole 2111 is connected to the second hole 2112, the aperture of the first hole 2111 is larger than the aperture of the second hole 2112, when the proximal aperture remains unchanged, the distal aperture increases, the intake pressure and velocity increase, and the flow rate of the working chamber 221 during inhalation is increased.

In addition, in the above embodiments, the fluid is not limited to air, but may also be other gaseous or liquid media.

In addition, in the above embodiments, the materials of the vibration component 2 and the valve component 3 can be metals and alloy materials such as copper and stainless steel.

The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims (6)

1. A piezoelectric pump core, characterized in that: the piezoelectric pump core comprises a control component (1), a vibration component (2) and a valve component (3); the control assembly (1) is arranged at the far end of the vibration assembly (2), and the valve assembly (3) is arranged at the near end of the vibration assembly (2);

The vibration assembly (2) is sequentially laminated with a first supporting plate (21), a supporting ring (22) and a second supporting plate (23) from the far end to the near end; a plurality of first through holes (211) are formed in the first supporting plate (21); -the support ring (22) has a hollow structure; a plurality of second through holes (231) are formed in the second supporting plate (23); wherein the first supporting plate (21), the supporting ring (22) and the second supporting plate (23) enclose a working cavity (221), and the diameter of the far end of the first through hole (211) is larger than that of the near end of the first through hole (211);

The valve assembly (3) is communicated with the second through hole (231) and can control the second through hole (231) to be opened and closed;

A portion of the control assembly (1) is energized to generate buckling vibrations and to drive a portion of the vibration assembly (2) to elastically deform and squeeze the working chamber (221) to pump fluid to the valve assembly (3).

2. A piezoelectric pump core according to claim 1, wherein: the first through hole (211) comprises a first hole (2111) and a second hole (2112) formed in the proximal end of the first hole (2111), the aperture of the first hole (2111) is larger than that of the second hole (2112), and the first hole (2111) is communicated with the second hole (2112).

3. A piezoelectric pump core according to claim 1, wherein: the control assembly comprises a positive electrode plate (11), a piezoelectric ceramic plate (13) and a negative electrode plate (12), wherein the positive electrode plate (11) is arranged at the far end of the piezoelectric ceramic plate (13), the piezoelectric ceramic plate (13) is arranged at the far end of the first supporting plate (21), electrodes are arranged on the surface of the piezoelectric ceramic plate (13) and are polarized, and the negative electrode plate (12) is arranged at the near end of the valve assembly (3).

4. A piezoelectric pump core according to claim 3, wherein: the positive electrode plate (11) is flexibly connected with the distal end of the piezoelectric ceramic plate (13), and the negative electrode plate (12) is flexibly connected with the proximal end of the valve component (3).

5. A piezoelectric pump core according to claim 1, wherein: the far end of the valve component (3) is provided with a plurality of third through holes (311), and the third through holes (311) are opposite to the second through holes (231); -a valve plate (32) is arranged in the valve assembly (3), the valve plate (32) being an elastic plate, the valve plate (32) being held elastically deformed in the valve assembly (3); a plurality of fourth through holes (321) are formed in the valve plate (32), and the fourth through holes (321) are not opposite to the third through holes (311); the proximal end of the valve assembly (3) is provided with a plurality of fifth through holes (331), and the fifth through holes (331) are opposite to the fourth through holes (321).

6. A piezoelectric pump core according to claim 5, wherein: the valve assembly (3) sequentially stacks a valve cover (31), a valve seat (33) and a valve plate (32) from the far end to the near end; the valve cover (31) is provided with the third through hole (311); the valve seat (33) is provided with the fifth through hole (331) and forms a valve chamber with the valve cover (31); the valve plate (32) is held so as to be elastically deformable in the valve chamber.