Double-acting piezoelectric air pump

Abstract

The invention discloses a double-acting piezoelectric air pump which comprises a pump body with a cavity, a first diaphragm valve plate, a vibrator and a second diaphragm valve plate, wherein the first diaphragm valve plate, the vibrator and the second diaphragm valve plate are transversely arranged in the cavity. A first air inlet is formed in the first diaphragm valve plate, a second air inlet is formed in the second diaphragm valve plate, a discharge channel, a first air inlet channel, a second air inlet channel, a first air outlet channel, a second air outlet channel, a first convex column and a second convex column are arranged on the pump body, and the discharge channel communicates with the first air outlet channel and the second air outlet channel; in the process that the vibrator deforms and displaces in the direction close to the first convex column, the first convex column is in clearance fit with the first air inlet, and the second convex column is separated from the clearance fit with the second air inlet; in the process that the vibrator deforms and displaces in the direction close to the second convex column, the first convex column is separated from the clearance fit with the first air inlet, and the second convex column is in clearance fit with the second air inlet; the air pumping efficiency and the exhaust flow are greatly improved.

Description

Technical Field

[0001] The invention relates to an air pump used in microelectronics, medical treatment, health care and other industries, and in particular to a double-acting piezoelectric pump used in a sphygmomanometer. Background Art

[0002] As we all know, hypertension has gradually risen to the top of the list of human disease hazards. How to conveniently and effectively measure and monitor hypertension, so as to effectively prevent and treat hypertension, has become an important issue in people's fight against hypertension.

[0003] At present, the measurement of blood pressure is inseparable from the use of a sphygmomanometer, which is a very common instrument for measuring blood pressure.

[0004] Among them, the sphygmomanometer cannot do without the use of an air pump, which inflates the air bag to meet the sphygmomanometer's blood pressure test needs. Compared with traditional motor air pumps, piezoelectric pumps have the advantages of low noise, small size, small airflow ripple, and stable flow, so they have obvious performance advantages in the application of sphygmomanometers.

[0005] However, in the existing piezoelectric pump, its vibrator can only complete the suction and exhaust of gas once in one cycle, so the existing piezoelectric pump has low pumping efficiency and exhaust flow rate, and cannot be adapted to large flow occasions.

[0006] Therefore, there is an urgent need for a double-acting piezoelectric pump to overcome one or more of the above-mentioned deficiencies. Summary of the invention

[0007] The object of the present invention is to provide a double-acting piezoelectric pump which greatly improves the pumping efficiency and exhaust flow rate to adapt to large flow situations, and is more compact under the same flow rate.

[0008] To achieve the above-mentioned purpose, the double-acting piezoelectric pump of the present invention comprises a pump body having a cavity therein, and a first diaphragm valve disc, a vibrator, and a second diaphragm valve disc disposed transversely in the cavity and sequentially spaced apart along a first direction. The first diaphragm valve disc, the vibrator, and the second diaphragm valve disc are also sealedly connected to the pump body and divide the cavity into a first air inlet chamber, a first pump chamber, a second pump chamber, and a second air inlet chamber, respectively. The first diaphragm valve sheet is provided with a first air inlet for connecting the first air inlet chamber and the first pump chamber, and the second diaphragm valve sheet is provided with a second air inlet for connecting the second air inlet chamber and the second pump chamber; the pump body is provided with an external discharge channel, a first air inlet channel connected with the first air inlet chamber, a second air inlet channel connected with the second air inlet chamber, a first air outlet channel connected with the first pump chamber, a second air outlet channel connected with the second pump chamber, a first protrusion protruding toward the first diaphragm valve sheet and a second protrusion protruding toward the second diaphragm valve sheet, the external discharge channel being connected with the first air outlet channel and the second air outlet channel respectively; in the process of deformation displacement of the vibrator in the direction approaching the first protrusion, the first protrusion is caused to be in clearance fit with the first air inlet and the second protrusion is caused to be out of clearance fit with the second air inlet; in the process of deformation displacement of the vibrator in the direction approaching the second protrusion, the first protrusion is caused to be out of clearance fit with the first air inlet and the second protrusion is caused to be in clearance fit with the second air inlet.

[0009] Compared with the prior art, in the process of the vibrator deforming and displacing in the direction close to the first protrusion (i.e., in the process of the first half cycle), the deformed and displaced vibrator reduces the volume of the first pump chamber, so that the gas in the first pump chamber pushes the first diaphragm valve plate to move toward the first protrusion, so that the first protrusion enters the first air inlet and cooperates with the gap of the first air inlet, so as to inhibit the gas in the first pump chamber from flowing back into the first air inlet chamber; in addition, the compressed gas in the first pump chamber is pumped out from the external discharge channel through the first air outlet channel. At the same time, in the first half cycle, the volume of the second pump chamber is expanded to form a negative pressure, so that the second diaphragm valve plate deforms in the direction away from the second protrusion, so that the second air inlet of the second diaphragm valve plate is out of the gap cooperation with the second protrusion, and then the gas enters the second pump chamber from the second air inlet chamber, and the external gas enters the second air inlet chamber through the second air inlet channel.

[0010] During the process of the vibrator deforming and displacing in the direction close to the second protrusion (i.e., in the second half cycle), the deformed and displaced vibrator reduces the volume of the second pump chamber, so that the gas in the second pump chamber pushes the second diaphragm valve plate to move toward the second protrusion, so that the second protrusion enters the second air inlet and cooperates with the clearance of the second air inlet, thereby preventing the gas in the second pump chamber from flowing back into the second air inlet chamber; in addition, the compressed gas in the second pump chamber is pumped out from the external discharge channel through the second air outlet channel. At the same time, in the second half cycle, the volume of the first pump chamber is expanded to form a negative pressure, so that the first diaphragm valve plate deforms in the direction away from the first protrusion, so that the first air inlet of the first diaphragm valve plate is out of clearance cooperation with the first protrusion, and then the gas enters the first pump chamber from the first air inlet chamber, and the external gas enters the first air inlet chamber through the first air inlet channel.

[0011] Therefore, in one cycle of the vibrator, the suction and exhaust work are completed twice, which greatly improves the pumping efficiency and exhaust flow rate to adapt to the double-acting piezoelectric pump in large flow occasions; in addition, it is more compact under the same flow rate.

[0012] Preferably, the double-acting piezoelectric pump of the present invention further comprises a check valve disposed on the pump body and preventing the gas in the external discharge channel from flowing back toward the first outlet channel and the second outlet channel.

[0013] Preferably, the external discharge channel has a first conical cavity for communicating with the first air outlet channel and the second air outlet channel, and the pump body is correspondingly provided with a conical structure protruding from the first conical cavity, and the first air outlet channel and the second air outlet channel each extend to the side wall of the conical structure; a second conical cavity matching the conical structure is penetrated through the middle of the check valve, and the check valve is tightly fitted onto the conical structure with the aid of the second conical cavity, and the check valve also selectively opens or blocks the parts of the first air outlet channel and the second air outlet channel on the side wall of the conical structure; the center lines of the first conical cavity and the conical structure coincide.

[0014] Preferably, the air outlet of the first pump chamber and the air outlet of the second pump chamber are arranged diagonally, and the first air outlet channel and the second air outlet channel are arranged opposite to each other with the frustum structure as the center.

[0015] Preferably, the first pump chamber and the second pump chamber each have two air outlets arranged diagonally, each air outlet of the first pump chamber corresponds to one first air outlet channel; each air outlet of the second pump chamber corresponds to one second air outlet channel; the two first air outlet channels are arranged relative to each other with the frustum structure as the center, and the two second air outlet channels are arranged relative to each other with the frustum structure as the center.

[0016] Preferably, the first air outlet channel also extends along the first direction and passes through the first protruding column.

[0017] Preferably, the double-acting piezoelectric pump of the present invention also includes a first connecting channel and a second connecting channel, the first connecting channel penetrates the first diaphragm valve plate along the first direction and extends in the pump body, and the air outlet of the first pump chamber is connected to the first air outlet channel through the first connecting channel; the second connecting channel penetrates the first diaphragm valve plate and the vibrator along the first direction and extends in the pump body, and the air outlet of the second pump chamber is connected to the second air outlet channel through the second connecting channel.

[0018] Preferably, the vibrator includes a vibration plate and a piezoelectric ceramic sheet, the vibration plate includes an external connection portion for sealing connection with the pump body, a flat portion surrounded by the external connection portion, and a corrugated suspension portion connected between the flat portion and the external connection portion, and the piezoelectric ceramic sheet is fixed at the flat portion.

[0019] Preferably, the pump body is also provided with an external inlet channel for external gas to enter the first air inlet channel and the second air inlet channel; the check valve comprises a circular ring base and a circular cone connected to the circular ring base and coaxially arranged, the second frustum cavity passes through the circular ring base and the circular cone, and the wall thickness of the circular cone is smaller than the wall thickness of the circular ring base.

[0020] Preferably, the pump body includes a cover body, a first cover plate, a hollow first middle plate, a hollow second middle plate and a second cover plate which are arranged and fixed together in sequence along the first direction, the first diaphragm valve plate is clamped in a sealing manner between the first cover plate and the first middle plate, the vibrator is clamped in a sealing manner between the first middle plate and the second middle plate, the second diaphragm valve plate is clamped in a sealing manner between the second middle plate and the second cover plate, and the check valve is clamped in a sealing manner between the cover body and the first cover plate.

[0021] Preferably, the external discharge channel extends along the first direction and passes through the cover body, the frustum structure is located at the first cover plate, the first air outlet channel and the second air outlet channel are each surrounded by the cover body and the first cover plate; the first air inlet chamber and the first air inlet channel are each surrounded by the first cover plate and the first diaphragm valve plate; the second air inlet chamber and the second air inlet channel are each surrounded by the second diaphragm valve plate and the second cover plate; the first pump chamber is surrounded by the first diaphragm valve plate, the first middle plate and the vibrator; the second pump chamber is surrounded by the vibrator, the second middle plate and the second diaphragm valve plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1It is a stereoscopic view of a double-acting piezoelectric pump according to a first embodiment of the present invention.

[0023] Figure 2 yes Figure 1 Exploded perspective view of a double-acting piezoelectric pump shown.

[0024] Figure 3 yes Figure 1 The double-acting piezoelectric pump shown is a plan view viewed along the direction indicated by arrow A.

[0025] Figure 4 is along Figure 3 Internal view along the midline BB with the vibrator in the initial position.

[0026] Figure 5 is Figure 4 Based on this, a state diagram is shown when the vibrator is deformed and displaced toward the direction close to the first protrusion to the first extreme position.

[0027] Figure 6 is Figure 4 Based on this, a state diagram is shown when the vibrator is deformed and displaced toward the second protrusion to the second extreme position.

[0028] Figure 7 is along Figure 3 Internal view along the CC line with the vibrator in the initial position.

[0029] Figure 8 It is a plan view of a double-acting piezoelectric pump according to a second embodiment of the present invention.

[0030] Fig. 9 yes Figure 8 Exploded perspective view of a double-acting piezoelectric pump shown.

[0031] Fig.10 is along Figure 8 Internal view along the midline DD with the vibrator in the initial position.

[0032] Fig.11 is along Figure 8 Internal view along the midline EE with the vibrator in the initial position.

[0033] Fig.12 is along Figure 8 Internal view along line FF with the vibrator in the initial position.

[0034] Fig.13 It is an internal view of a double-acting piezoelectric pump according to a third embodiment of the present invention.

[0035] Fig.14 yes Fig.13 Exploded perspective view of a double-acting piezoelectric pump shown. DETAILED DESCRIPTION

[0036] In order to explain the technical content and structural features of the present invention in detail, further description will be given below in combination with the implementation modes and the accompanying drawings.

[0037] See also Figure 1 As an example, the double-acting piezoelectric pump 100 of the first embodiment can be applied to a sphygmomanometer to pump gas for the air bag of the sphygmomanometer.

[0038] Recombination Figure 2 , Figure 4 and Figure 7 The double-acting piezoelectric pump 100 of the first embodiment includes a check valve 10, a pump body 20 having a cavity 21 therein, and a first diaphragm valve plate 30, a vibrator 40 and a second diaphragm valve plate 50 which are disposed transversely in the cavity 21 and are arranged in sequence along a first direction (as indicated by arrow A). The first diaphragm valve disc 30, the vibrator 40 and the second diaphragm valve disc 50 are also sealed and connected to the pump body 20 to prevent leakage at the connection points between the upper pump body 20 and the first diaphragm valve disc 30, the vibrator 40 and the second diaphragm valve disc 50 respectively; the first diaphragm valve disc 30, the vibrator 40 and the second diaphragm valve disc 50 also divide the cavity 21 into the first air intake chamber 21a, the first pump chamber 21b, the second pump chamber 21c and the second air intake chamber 21d respectively; and the first diaphragm valve disc 30, the vibrator 40 and the second diaphragm valve disc 50 are arranged in sequence along the first direction, so that the first air intake chamber 21a, the first pump chamber 21b, the second pump chamber 21c and the second air intake chamber 21d are also arranged in sequence along the first direction.

[0039] At the same time, the first diaphragm valve plate 30 is provided with a first air inlet 31 for connecting the first air inlet chamber 21a and the first pump chamber 21b, so that the first air inlet chamber 21a and the first pump chamber 21b are connected through the first air inlet 31. Optionally, Figure 2 As an example, the first air inlet 31 is a circular opening, so as to facilitate the manufacturing and processing of the first air inlet 31 on the first diaphragm valve plate 30; obviously, according to actual needs, the shape of the first air inlet 31 can also be an elliptical opening or a regular polygonal opening, so it is not necessary to Figure 2 The second diaphragm valve plate 50 is provided with a second air inlet 51 for connecting the second air inlet chamber 21d and the second pump chamber 21c, so that the second air inlet chamber 21d and the second pump chamber 21c are connected via the second air inlet 51; Figure 2 As an example, the second air inlet 51 is a circular opening, so as to facilitate the manufacturing and processing of the second air inlet 51 on the second diaphragm valve plate 50; obviously, according to actual needs, the shape of the second air inlet 51 can also be an elliptical opening or a regular polygonal opening, so it is not necessary to Figure 2 Limits shown.

[0040] Furthermore, the pump body 20 is provided with an external discharge channel 22, a first air inlet channel 23 communicated with the first air inlet chamber 21a, a second air inlet channel 24 communicated with the second air inlet chamber 21d, a first air outlet channel 25 communicated with the first pump chamber 21b, a second air outlet channel 26 communicated with the second pump chamber 21c, a first boss 27 protruding toward the first diaphragm valve disc 30, and a second boss 28 protruding toward the second diaphragm valve disc 50; the external discharge channel 22 is communicated with the first air outlet channel 25 and the second air outlet channel 26, respectively, to meet the need of the gas in the first pump chamber 21b to flow from the first air outlet channel 25 to the external discharge channel 22 due to the reduction in volume of the first pump chamber 21b, and to meet the need of the gas in the second pump chamber 21c to flow from the second air outlet channel 26 to the external discharge channel 22 due to the reduction in volume of the second pump chamber 21c.

[0041] The check valve 10 is disposed on the pump body 20 , and the pump body 20 provides support and a place for assembling the check valve 10 ; the check valve 10 also blocks the gas in the external discharge channel 22 from flowing back to the first outlet channel 25 and the second outlet channel 26 .

[0042] Therefore, when the vibrator 40 is deformed and displaced in the direction close to the first protrusion 27, the vibrator 40 makes the first protrusion 27 fit with the first air inlet 31, and the vibrator 40 also makes the second protrusion 28 break away from the fit with the second air inlet 51. Figure 5 shown; and Figure 5 In the process, the volume of the first pump chamber 21b is reduced and the gas in the first pump chamber 21b is compressed, so that the compressed gas passes through the first outlet channel 25 and pushes the check valve 10 to be discharged from the outer discharge channel 22. At the same time, the volume of the second pump chamber 21c is expanded to form a negative pressure, sucking the gas in the second inlet chamber 21d; wherein, the flow direction of the gas is shown in FIG. Figure 5 Indicated by the dashed arrow.

[0043] During the process of the vibrator 40 deforming and displacing in the direction close to the second protrusion 28, the vibrator 40 causes the first protrusion 27 to be separated from the clearance fit with the first air inlet 31, and the vibrator 40 also causes the second protrusion 28 to be clearance fit with the second air inlet 51. Figure 6 shown; and Figure 6 In the process, the volume of the first pump chamber 21b is expanded to form a negative pressure, sucking the gas in the first air inlet chamber 21a. At the same time, the volume of the second pump chamber 21c is reduced to compress the gas in the second pump chamber 21c, so that the compressed gas passes through the second air outlet channel 26 and pushes open the check valve 10 and then is discharged from the external discharge channel 22; wherein, the flow direction of the gas is shown in FIG. Figure 5 As shown by the dashed arrow in the figure. More specifically, as follows:

[0044] like Figures 4 to 7As shown, as an example, the outer discharge channel 22 has a first truncated cone cavity 221 for communicating with the first outlet channel 25 and the second outlet channel 26, and the pump body 20 is correspondingly provided with a truncated cone structure 29a protruding from the first truncated cone cavity 221. Optionally, Figure 7 As an example, the center lines of the first truncated cone cavity 221 and the truncated cone structure 29a (see Figure 7 The center line of the first truncated cone cavity 221 and the truncated cone structure 29a are coincident, so that the gaps between the first truncated cone cavity 221 and the truncated cone structure 29a are the same in size. Therefore, while ensuring that the first truncated cone cavity 221 and the truncated cone structure 29a are more compactly matched, more sufficient movement space can be provided for the check valve 10 to open the first outlet channel 25 and the second outlet channel 26. The first outlet channel 25 and the second outlet channel 26 each extend to the side wall of the truncated cone structure 29a. Figures 4 to 6 As shown. The middle part of the check valve 10 is provided with a second truncated cone cavity 11 matching the truncated cone structure 29a. The check valve 10 is tightly fitted on the truncated cone structure 29a with the help of the second truncated cone cavity 11. The check valve 10 also selectively opens or blocks the first air outlet channel 25 and the second air outlet channel 26 on the side wall of the truncated cone structure 29a. This design enables one check valve 10 to be responsible for the opening or blocking operation of the first air outlet channel 25 and the second air outlet channel 26, thereby reducing the number of check valves 10 used. Specifically, Figure 2 and Figures 4 to 7 In the embodiment, as an example, the check valve 10 comprises a circular base 10a and a circular cone 10b connected to the circular base 10a and arranged coaxially, the second truncated cone cavity 11 penetrates the circular base 10a and the circular cone 10b, the wall thickness of the circular cone 10b is less than the wall thickness of the circular base 10a, so the circular base 10a with a large wall thickness is sealed and clamped between the cover body 20a and the first cover plate 20b described below, so that the check valve 10 is reliably fixed to the pump body 20, and the circular cone 10 with a small wall thickness is closely matched with the truncated cone structure 29a, so that the circular cone 10 is more convenient to open or block the part 251 of the first outlet channel 25 and the part 261 of the second outlet channel 26. More specifically, as an example, the check valve 10 is a high-rebound valve, and the material can be selected from high-rebound materials such as rubber and silicone, but is not limited thereto.

[0045] like Figure 2 and Figures 4 to 6 As shown, as an example, the air outlet 211 of the first pump chamber 21b and the air outlet 212 of the second pump chamber 21c are arranged diagonally, and correspondingly, the first air outlet channel 25 and the second air outlet channel 26 are arranged relative to each other with the truncated cone structure 29a as the center. Figure 2In the embodiment, the first air outlet channel 25 is arranged on the right side of the truncated cone structure 29a, and the second air outlet channel 26 is arranged on the left side of the truncated cone structure 29a; obviously, according to actual needs, their positions can also be interchanged. Figure 2 In addition, the air outlet 211 of the first pump chamber 21b and the air outlet 212 of the second pump chamber 21c are arranged diagonally, and the first air outlet channel 25 and the second air outlet channel 26 are arranged relatively with the truncated cone structure 29a as the center, so that their design at the pump body 20 is reasonable and compact.

[0046] like Figures 4 to 6 As shown, as an example, the double-acting piezoelectric pump 100 of the first embodiment also includes a first communicating channel 60 and a second communicating channel 70. The first communicating channel 60 penetrates the first diaphragm valve plate 30 along a first direction and extends in the pump body 10. The air outlet 212 of the first pump chamber 21b is communicated with the first air outlet channel 25 via the first communicating channel 60. The second communicating channel 70 penetrates the first diaphragm valve plate 30 and the vibrator 40 along a first direction and extends in the pump body 20. The air outlet 212 of the second pump chamber 21c is communicated with the second air outlet channel 26 via the second communicating channel 70. Therefore, with the help of the first communicating channel 60 and the second communicating channel 70, the manufacturing and processing of the first pump chamber 21b, the first air outlet channel 25, the second pump chamber 21c and the second air outlet channel 26 in the pump body 20 are facilitated. In addition, Figure 7 As an example, the pump body 20 is further provided with an external inlet channel 29 b for allowing external gas to enter the first inlet channel 23 and the second inlet channel 24 .

[0047] like Figure 2 and Figures 4 to 7As shown, as an example, the vibrator 40 includes a vibration plate 41 and a piezoelectric ceramic sheet 42. The vibration plate 41 includes an external connection portion 411 for sealingly connecting with the pump body 20, a flat portion 412 surrounded by the external connection portion 411, and a corrugated suspension portion 413 connected between the flat portion 412 and the external connection portion 411. The piezoelectric ceramic sheet 42 is fixed at the flat portion 412; therefore, with the help of the flat portion 412, the stability of the piezoelectric ceramic sheet 42 and the vibration plate 41 is improved. For example, the piezoelectric ceramic sheet 42 can be glued to the flat portion 412; in addition, with the help of the corrugated suspension portion 413, it can withstand a larger deformation displacement. Specifically, as an example, the material of the vibration plate 41 can be a copper alloy such as phosphor copper, beryllium copper or stainless steel and other conductive metal materials with good elasticity; the two end surfaces of the piezoelectric ceramic sheet 42 are two electrodes respectively, and the vibration plate 41 is used as one electrode of the piezoelectric ceramic sheet 42, and the electrode terminal ear 421 is welded on the other side of the piezoelectric ceramic sheet 42 and led to the outside, and the electrode terminal ear 421 can be a metal conductive material; in addition, the external connection part 411 of the vibration plate 41 is provided with an external terminal ear 414. Therefore, when an alternating voltage is applied to the electrode terminal ear 421 and the external terminal ear 414, the piezoelectric ceramic sheet 42 is stretched and contracted due to the inverse piezoelectric effect, thereby driving the vibrator 40 to vibrate up and down. More specifically, the corrugated suspension part 413 of the vibration plate 41 can be made by a stamping process, but is not limited thereto.

[0048] like Figure 1 and Figure 2 ,as well as Figures 4 to 7 As shown, as an example, the pump body 20 includes a cover body 20a, a first cover plate 20b, a hollow first middle plate 20c, a hollow second middle plate 20d and a second cover plate 20e which are sequentially arranged and fixed together along a first direction. The first diaphragm valve disc 30 is clamped in a sealing fit between the first cover plate 20b and the first middle plate 20c, the vibrator 40 is clamped in a sealing fit between the first middle plate 20c and the second middle plate 20d, the second diaphragm valve disc 50 is clamped in a sealing fit between the second middle plate 20d and the second cover plate 20e, and the check valve 10 is clamped in a sealing fit between the cover body 20a and the first cover plate 20b; such a design facilitates the installation operation of the first diaphragm valve disc 30, the vibrator 40, the second diaphragm valve disc 50 and the check valve 10 at the pump body 20. Specifically, at Figures 4 to 7 As an example, the outer discharge channel 22 extends along the first direction and penetrates the cover body 20a, so as to facilitate the processing and manufacturing of the outer discharge channel 22 on the cover body 20a; the truncated cone structure 29a is located on the first cover plate 20b, so as to facilitate the manufacturing and processing of the truncated cone structure 29a on the first cover plate 20b; the first gas outlet channel 25 and the second gas outlet channel 26 are respectively surrounded by the cover body 20a and the first cover plate 20b, so as to facilitate the opening and processing of the first gas outlet channel 25 and the second gas outlet channel 26, for example, Figure 2 and Figures 4 to 6In the embodiment, the first air outlet channel 25 and the second air outlet channel 26 are opened on the first cover plate 20b and face the cover body 20a, and the cover body 20a closes the openings of the first air outlet channel 25 and the second air outlet channel 26 facing the cover body 20a, so as to facilitate the opening and processing of the first air outlet channel 25 and the second air outlet channel 26 on the pump body 20; the first air inlet chamber 21a and the first air inlet channel 23 are respectively surrounded by the first cover plate 20b and the first diaphragm valve sheet 30, so as to facilitate the opening and processing of the first air inlet chamber 21a and the first air inlet channel 23. The channel 23 is manufactured and processed on the first cover plate 20b; the second air inlet chamber 21d and the second air inlet channel 24 are each surrounded by the second diaphragm valve plate 50 and the second cover plate 20e, so as to facilitate the manufacturing and processing of the second air inlet chamber 21d and the second air inlet channel 24 on the second cover plate 20e; the first pump chamber 21b is surrounded by the first diaphragm valve plate 30, the first middle plate 20c and the vibrator 40; the second pump chamber 21c is surrounded by the vibrator 40, the second middle plate 20d and the second diaphragm valve plate 50. Specifically, as an example, the first diaphragm valve disc 30 and the second diaphragm valve disc 50 can be made of metal materials with good elasticity such as copper alloy and stainless steel; the first middle plate 20c can be a plastic part, so that the first middle plate 20c is made by injection molding and has insulation performance, and is used to isolate the electrical connection between the electrode terminal ear 421 and the vibration plate 41; the second middle plate 20d is a metal part, so that the second middle plate 20d has good heat dissipation performance and dissipates heat outward. Optionally, Figures 1 to 3 As an example, the second middle plate 20d is arranged to protrude outward relative to the cover body 20a, the first cover plate 20b, the first middle plate 20c and the second cover plate 20e to obtain a better heat dissipation effect; the cover body 20a, the first cover plate 20b and the second cover plate 20e can be plastic parts, such as PPS fiber-reinforced or nylon fiber-reinforced, etc., so that the cover body 20a, the first cover plate 20b and the second cover plate 20e can be manufactured by injection molding.

[0049] It should be noted that when the pump body 20 includes a cover body 20a, a first cover plate 20b, a hollow first middle plate 20c, a hollow second middle plate 20d and a second cover plate 20e arranged in sequence and fixed together along the first direction, correspondingly, the external connection portion 411 of the vibration plate 41 is sealed and clamped between the first middle plate 20c and the second middle plate 20d; the first boss 27 is located on the first cover plate 20b, and the second boss 28 is located on the second cover plate 20e; the first connecting channel 60 penetrates the first cover plate 20b and the first diaphragm valve plate 30 along the first direction; the second connecting channel 70 penetrates the first cover plate 20b, the first diaphragm valve plate 30, the first middle plate 20c and the vibration plate 41 along the first direction; the external inlet channel 29b is located on the second cover plate 20e.

[0050] See also Figures 8 to 12The structure of the double-acting piezoelectric pump 100 of the second embodiment is substantially the same as that of the double-acting piezoelectric pump 100 of the first embodiment, except for the following differences:

[0051] (1) In the double-acting piezoelectric pump 100 of the second embodiment, the first pump chamber 21b and the second pump chamber 21c have two air outlets 211 (212) arranged diagonally, and each air outlet 211 of the first pump chamber 21b corresponds to a first air outlet channel 25; each air outlet 212 of the second pump chamber 21c corresponds to a second air outlet channel 26; the two first air outlet channels 25 are arranged opposite to each other with the truncated cone structure 29a as the center, and the two second air outlet channels 26 are arranged opposite to each other with the truncated cone structure 29a as the center. In addition, there are two first air inlet channels 23 and they are arranged opposite to each other with the first protruding column 27 as the center, and there are two second air inlet channels 24 and they are arranged opposite to each other with the second protruding column 28 as the center; such a design makes the pressure in the pump chamber of the double-acting piezoelectric pump 100 of the second embodiment balanced when working, and at the same time the pumping resistance becomes smaller, thereby more effectively improving the pumping efficiency.

[0052] In the first embodiment of the double-acting piezoelectric pump 100, the air outlet 211 of the first pump chamber 21b and the air outlet 212 of the second pump chamber 21c are arranged diagonally, and the first air outlet channel 25 and the second air outlet channel 26 are arranged opposite to each other with the truncated cone structure 29a as the center.

[0053] (2) In the double-acting piezoelectric pump 100 of the second embodiment, the pump body 20 thereof is not provided with an external inlet flow channel 29b. Accordingly, the first inlet channel 23 and the second inlet channel 24 are directly exposed to the outside.

[0054] In the double-acting piezoelectric pump 100 of the first embodiment, an external inlet flow channel 29 b is provided on the pump body 20 , so the external inlet flow channel 29 b is connected to the first inlet channel 23 and the second inlet channel 24 , respectively.

[0055] Apart from the above differences, the other two are the same, so I will not go into details here.

[0056] See also Fig.13 and Fig.14 The structure of the double-acting piezoelectric pump 100 of the third embodiment is substantially the same as that of the double-acting piezoelectric pump 100 of the first embodiment, except for the following differences:

[0057] In the double-acting piezoelectric pump 100 of the third embodiment, the first air outlet channel 25 also extends along the first direction and passes through the first protrusion 27, so that the first air outlet channel 25 becomes shorter; while in the double-acting piezoelectric pump 100 of the first embodiment, the first air outlet channel 25 is connected to the air outlet 211 of the first pump chamber 21b by means of the first connecting channel 60.

[0058] In addition, the double-acting piezoelectric pump 100 of the third embodiment further removes the first communication channel 60 .

[0059] Apart from the above differences, the other two are the same, so I will not go into details here.

[0060] Compared with the prior art, in the process of the vibrator 40 deforming and displacing in the direction close to the first boss 27 (i.e., in the first half cycle), the deformed and displaced vibrator 40 reduces the volume of the first pump chamber 21b, so that the gas in the first pump chamber 21b pushes the first diaphragm valve plate 30 to move toward the first boss 27, so that the first boss 27 enters the first air inlet 31 and fits with the gap of the first air inlet 31, thereby preventing the gas in the first pump chamber 21b from flowing back into the first air inlet chamber 21a; in addition, the compressed gas in the first pump chamber 21b passes through the first outlet channel 25 and pushes open the check valve 10 and is pumped out from the external discharge channel 22. At the same time, in the first half cycle, the volume of the second pump chamber 21c is expanded to form a negative pressure, causing the second diaphragm valve plate 50 to deform in the direction away from the second boss 28, thereby causing the second air inlet 51 of the second diaphragm valve plate 50 to break away from the clearance fit with the second boss 28, thereby allowing the gas to enter the second pump chamber 21c from the second air inlet chamber 21d, while the external gas enters the second air inlet chamber 21d through the second air inlet channel 24.

[0061] During the process of the vibrator 40 deforming and displacing in the direction close to the second boss 28 (i.e., during the second half cycle), the deformed and displaced vibrator 40 reduces the volume of the second pump chamber 21c, so that the gas in the second pump chamber 21c pushes the second diaphragm valve plate 50 to move toward the second boss 28, thereby causing the second boss 28 to enter the second air inlet 51 and fit with the clearance of the second air inlet 51, thereby preventing the gas in the second pump chamber 21c from flowing back into the second air inlet chamber 21d; in addition, the compressed gas in the second pump chamber 21c passes through the second outlet channel 26 and pushes open the check valve 10 and is pumped out from the external discharge channel 22. At the same time, in the second half of the cycle, the volume of the first pump chamber 21b is expanded to form a negative pressure, causing the first diaphragm valve plate 30 to deform in the direction away from the first protrusion 27, thereby causing the first air inlet 31 of the first diaphragm valve plate 30 to break away from the gap fit with the first protrusion 27, thereby allowing the gas to enter the first pump chamber 21b from the first air inlet chamber 21a, while the external gas enters the first air inlet chamber 21a through the first air inlet channel 23.

[0062] Therefore, in one cycle of the vibrator 40, the suction and exhaust operations are completed twice, which greatly improves the pumping efficiency and exhaust flow rate to adapt to the double-acting piezoelectric pump in large flow situations; in addition, it is more compact under the same flow rate.

[0063] It is worth noting that in the above-mentioned embodiment, the check valve 10 can be deleted; after deleting the check valve 10, the first air outlet channel 25 and the second air outlet channel 26 can be made into blocking channels, etc., but the present invention is not limited thereto.

[0064] It should be noted that the direction indicated by arrow A in the accompanying drawings is the first direction, and the direction perpendicular to the first direction is the transverse direction; in addition, the first air inlet channel 23, the second air inlet channel 24, the first air outlet channel 25 and the second air outlet channel 26 are also arranged to extend along the transverse direction.

[0065] The above disclosure is only a preferred embodiment of the present invention, which cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are all within the scope of the present invention.

Claims

1. A double-acting piezoelectric pump, characterized in that: The invention comprises a pump body having a cavity inside and a first diaphragm valve disc, a vibrator and a second diaphragm valve disc placed horizontally in the cavity and arranged in sequence along a first direction. The first diaphragm valve disc, the vibrator and the second diaphragm valve disc are also sealed and connected to the pump body and divide the cavity into a first air inlet chamber, a first pump chamber, a second pump chamber and a second air inlet chamber respectively. The first diaphragm valve disc is provided with a first air inlet port for connecting the first air inlet chamber and the first pump chamber, the second diaphragm valve disc is provided with a second air inlet port for connecting the second air inlet chamber and the second pump chamber, the pump body is provided with an external discharge channel, a first air inlet channel connected with the first air inlet chamber, and a second air inlet port connected with the second air inlet chamber. Two air inlet channels, a first air outlet channel connected to the first pump chamber, a second air outlet channel connected to the second pump chamber, a first boss protruding toward the first diaphragm valve plate, and a second boss protruding toward the second diaphragm valve plate, and the external discharge channel is respectively connected to the first air outlet channel and the second air outlet channel; the vibrator makes the first boss fit with the first air inlet gap and the second boss disengages from the second air inlet gap during the process of deformation displacement in the direction approaching the first boss; the vibrator makes the first boss disengage from the first air inlet gap and the second boss fit with the second air inlet gap during the process of deformation displacement in the direction approaching the second boss.

2. The double-acting piezoelectric pump according to claim 1, characterized in that: It also includes a check valve arranged on the pump body and preventing the gas in the external discharge channel from flowing back to the first air outlet channel and the second air outlet channel; the external discharge channel has a first conical cavity for communicating with the first air outlet channel and the second air outlet channel, and the pump body is correspondingly provided with a conical structure protruding from the first conical cavity, and the first air outlet channel and the second air outlet channel each extend to the side wall of the conical structure; a second conical cavity matching the conical structure is opened through the middle of the check valve, and the check valve is tightly fitted on the conical structure with the help of the second conical cavity, and the check valve also selectively opens or blocks the parts of the first air outlet channel and the second air outlet channel on the side wall of the conical structure; the center lines of the first conical cavity and the conical structure coincide.

3. The double-acting piezoelectric pump according to claim 2, characterized in that: The air outlet of the first pump chamber is arranged diagonally to the air outlet of the second pump chamber, and the first air outlet channel and the second air outlet channel are arranged opposite to each other with the frustum structure as the center.

4. The double-acting piezoelectric pump according to claim 2, characterized in that: The first pump chamber and the second pump chamber each have two air outlets arranged diagonally, each air outlet of the first pump chamber corresponds to a first air outlet channel; each air outlet of the second pump chamber corresponds to a second air outlet channel; the two first air outlet channels are arranged opposite to each other with the frustum structure as the center, and the two second air outlet channels are arranged opposite to each other with the frustum structure as the center.

5. The double-acting piezoelectric pump according to claim 1, characterized in that: The first air outlet channel also extends along the first direction and passes through the first convex column.

6. The double-acting piezoelectric pump according to claim 2, characterized in that: It also includes a first connecting channel and a second connecting channel, the first connecting channel penetrates the first diaphragm valve plate along the first direction and extends within the pump body, and the air outlet of the first pump chamber is connected to the first air outlet channel via the first connecting channel; the second connecting channel penetrates the first diaphragm valve plate and the vibrator along the first direction and extends within the pump body, and the air outlet of the second pump chamber is connected to the second air outlet channel via the second connecting channel.

7. The double-acting piezoelectric pump according to claim 1, characterized in that: The vibrator includes a vibration plate and a piezoelectric ceramic sheet. The vibration plate includes an external connection part for sealingly connecting with the pump body, a flat part surrounded by the external connection part, and a corrugated suspension part connected between the flat part and the external connection part. The piezoelectric ceramic sheet is fixed at the flat part.

8. The double-acting piezoelectric pump according to claim 2, characterized in that: The pump body is also provided with an external inlet channel for external gas to enter the first air inlet channel and the second air inlet channel; the check valve includes a circular ring base and a circular cone connected to the circular ring base and coaxially arranged, the second frustum cavity passes through the circular ring base and the circular cone, and the wall thickness of the circular cone is smaller than the wall thickness of the circular ring base.

9. The double-acting piezoelectric pump according to claim 2, characterized in that: The pump body includes a cover body, a first cover plate, a hollow first middle plate, a hollow second middle plate and a second cover plate which are arranged and fixed together in sequence along the first direction; the first diaphragm valve plate is clamped between the first cover plate and the first middle plate in a sealing manner; the vibrator is clamped between the first middle plate and the second middle plate in a sealing manner; the second diaphragm valve plate is clamped between the second middle plate and the second cover plate in a sealing manner; and the check valve is clamped between the cover body and the first cover plate in a sealing manner.

10. The double-acting piezoelectric pump according to claim 9, characterized in that: The external discharge channel extends along the first direction and passes through the cover body, the frustum structure is located on the first cover plate, the first air outlet channel and the second air outlet channel are respectively surrounded by the cover body and the first cover plate; the first air inlet chamber and the first air inlet channel are respectively surrounded by the first cover plate and the first diaphragm valve plate; the second air inlet chamber and the second air inlet channel are respectively surrounded by the second diaphragm valve plate and the second cover plate; the first pump chamber is surrounded by the first diaphragm valve plate, the first middle plate and the vibrator; the second pump chamber is surrounded by the vibrator, the second middle plate and the second diaphragm valve plate.

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