Double-acting piezoelectric air pump

Abstract

The utility model discloses a double-acting piezoelectric air pump which comprises a pump body, a first diaphragm valve plate, a vibrator and a second diaphragm valve plate. The pump body is provided with a cavity, and 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] This utility model relates to an air pump used in industries such as microelectronics, medical care, and health care, and in particular to a double-acting pressure electric pump for blood pressure monitors. Background Technology

[0002] As we all know, hypertension has gradually risen to the top of the list of human diseases. How to conveniently and effectively measure and monitor hypertension, so as to effectively prevent and treat hypertension, has become an important issue for people to combat hypertension.

[0003] Currently, the use of a sphygmomanometer is indispensable for measuring blood pressure; it is a very common instrument for measuring blood pressure.

[0004] For blood pressure monitors, an air pump is indispensable. The air pump inflates the bladder to meet the needs of blood pressure measurement. Piezoelectric air pumps have significant performance advantages over traditional electric air pumps, including lower noise, smaller size, less airflow ripple, and more stable flow, making them a superior choice for blood pressure monitors.

[0005] However, in existing pneumatic electric pumps, the vibrator can only complete one intake and exhaust of gas in one cycle, resulting in low pumping efficiency and exhaust flow rate, making them unsuitable for high-flow-rate applications.

[0006] Therefore, there is an urgent need for a double-acting electric pump to overcome one or more of the above-mentioned defects. Utility Model Content

[0007] The purpose of this invention is to provide a double-acting electric pump that greatly improves pumping efficiency and exhaust flow to adapt to high flow rate applications, and is also more compact while maintaining the same flow rate.

[0008] To achieve the above objectives, the double-acting electric pump of this invention includes a pump body with an internal cavity and a first diaphragm valve plate, a vibrator, and a second diaphragm valve plate arranged horizontally within the cavity and sequentially spaced apart along a first direction. The first diaphragm valve plate, the vibrator, and the second diaphragm valve plate are also sealed to the pump body, correspondingly dividing the cavity into a first air inlet chamber, a first pump chamber, a second pump chamber, and a second air inlet chamber. The first diaphragm valve plate has a first air inlet for connecting the first air inlet chamber and the first pump chamber, and the second diaphragm valve plate has a second air inlet for connecting the second air inlet chamber and the second pump chamber. The pump body has an external discharge channel, a first air inlet channel communicating with the first air inlet chamber, a second air inlet channel communicating with the second air inlet chamber, a first air outlet channel communicating with the first pump chamber, a second air outlet channel communicating with the second pump chamber, a first protrusion protruding towards the first diaphragm valve plate, and a second protrusion protruding towards the second diaphragm valve plate. The external discharge channel is connected to the first air outlet channel and the second air outlet channel, respectively. During the deformation displacement of the vibrator towards the first protrusion, the first protrusion is made to have a clearance fit with the first air inlet and the second protrusion is made to disengage from the clearance fit with the second air inlet. During the deformation displacement of the vibrator towards the second protrusion, the first protrusion is made to disengage from the clearance fit with the first air inlet and the second protrusion is made to have a clearance fit with the second air inlet.

[0009] Compared to existing technologies, during the deformation and displacement of the vibrator towards the first protrusion (i.e., during the first half of the cycle), the deformed vibrator reduces the volume of the first pump chamber, causing the gas in the first pump chamber to push the first diaphragm valve plate towards the first protrusion. This allows the first protrusion to enter the first air inlet and engage with it, thus suppressing the backflow of gas from the first pump chamber into the first air intake chamber. Simultaneously, the compressed gas in the first pump chamber is pumped out through the first air outlet channel. Meanwhile, during the first half of the cycle, the volume of the second pump chamber expands, creating a negative pressure. This causes the second diaphragm valve plate to deform away from the second protrusion, disengaging the second air inlet of the second diaphragm valve plate from the second protrusion. This allows gas to enter the second pump chamber from the second air intake chamber, while external gas enters the second air intake chamber through the second air intake channel.

[0010] During the deformation and displacement of the vibrator towards the second protrusion (i.e., in the second half of the cycle), the deformed vibrator reduces the volume of the second pump chamber, causing the gas in the second pump chamber to push the second diaphragm valve plate towards the second protrusion. This allows the second protrusion to enter the second air inlet and engage with it, thus suppressing backflow of gas from the second pump chamber into the second air inlet chamber. Meanwhile, the compressed gas in the second pump chamber is pumped out through the second exhaust channel. Simultaneously, in the second half of the cycle, the volume of the first pump chamber expands, creating a negative pressure. This causes the first diaphragm valve plate to deform away from the first protrusion, disengaging the first air inlet of the first diaphragm valve plate from the first protrusion. This allows gas to enter the first pump chamber from the first air inlet chamber, while external gas enters the first air inlet chamber through the first air inlet channel.

[0011] Therefore, the pump completes two intake and exhaust cycles within one cycle of the vibrator, greatly improving pump efficiency and exhaust flow rate, making it suitable for double-acting electric pumps in high-flow-rate applications; in addition, it is more compact while maintaining the same flow rate.

[0012] Preferably, the double-acting electric pump of this invention further includes a check valve disposed on the pump body and preventing gas in the exhaust channel from flowing back into the first exhaust channel and the second exhaust channel.

[0013] Preferably, the external discharge channel has a first frustum cavity for communicating with the first and second air outlet channels. The pump body is correspondingly provided with a frustum structure protruding from the first frustum cavity. The first and second air outlet channels each extend to the side wall of the frustum structure. The check valve has a second frustum cavity that matches the frustum structure through its middle portion. The check valve is fitted tightly onto the frustum structure through the second frustum cavity. The check valve also selectively opens or blocks the portions of the first and second air outlet channels on the side wall of the frustum structure. The centerlines of the first frustum cavity and the frustum structure coincide.

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

[0016] Preferably, the first air outlet channel also extends along the first direction and penetrates the first protrusion.

[0017] Preferably, the double-acting electric pump of this utility model further includes a first connecting channel and a second connecting channel. The first connecting channel extends through the first diaphragm valve plate along the first direction and extends into the pump body. 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 extends through the first diaphragm valve plate and the vibrator along the first direction and extends into the pump body. 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 vibrating plate and a piezoelectric ceramic plate. The vibrating plate includes an outer connecting portion for sealing connection with the pump body, a flat portion surrounded by the outer connecting portion, and a corrugated suspension portion connecting the flat portion and the outer connecting portion. The piezoelectric ceramic plate is fixed to the flat portion.

[0019] Preferably, the pump body is further provided with an external inlet channel for external gas to enter the first and second inlet channels; the check valve includes an annular base and an annular cone connected to and coaxially arranged with the annular base, the second frustum cavity penetrates the annular base and the annular cone, and the wall thickness of the annular cone is less than the wall thickness of the annular base.

[0020] Preferably, the pump body includes a cover, a first cover plate, a hollow first middle plate, a hollow second middle plate, and a second cover plate arranged sequentially and fixed together along the first direction. The first diaphragm valve is sealed between the first cover plate and the first middle plate. The vibrator is sealed between the first middle plate and the second middle plate. The second diaphragm valve is sealed between the second middle plate and the second cover plate. The check valve is sealed between the cover and the first cover plate.

[0021] Preferably, the exhaust channel extends along the first direction and penetrates the cover body; the frustum structure is located on the first cover plate; the first exhaust channel and the second exhaust channel are each enclosed by the cover body and the first cover plate; the first intake chamber and the first intake channel are each enclosed by the first cover plate and the first diaphragm valve; the second intake chamber and the second intake channel are each enclosed by the second diaphragm valve and the second cover plate; the first pump chamber is enclosed by the first diaphragm valve, the first middle plate, and the vibrator; the second pump chamber is enclosed by the vibrator, the second middle plate, and the second diaphragm valve. Attached Figure Description

[0022] Figure 1This is a perspective view of the double-acting electric pump according to the first embodiment of this utility model.

[0023] Figure 2 yes Figure 1 The diagram shown is an exploded three-dimensional view of a double-acting electric pump.

[0024] Figure 3 yes Figure 1 The diagram shows a double-acting electric pump viewed in the direction indicated by arrow A.

[0025] Figure 4 It is along Figure 3 Internal view of the vibrator when cut along the BB line and in its initial position.

[0026] Figure 5 Is Figure 4 Based on this, a state diagram is shown when the vibrator deforms and displaces towards the first protrusion to the first limit position.

[0027] Figure 6 Is Figure 4 Based on this, a state diagram is shown when the vibrator deforms and displaces towards the second protrusion to the second limit position.

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

[0029] Figure 8 This is a plan view of the double-acting pressure electric pump according to the second embodiment of this utility model.

[0030] Figure 9 yes Figure 8 The diagram shown is an exploded three-dimensional view of a double-acting electric pump.

[0031] Figure 10 It is along Figure 8 Internal view of the vibrator when it is cut along the DD line and in its initial position.

[0032] Figure 11 It is along Figure 8 Internal view of the vibrator when it is cut along the EE line and in its initial position.

[0033] Figure 12 It is along Figure 8 Internal view of the vibrator when cut along the FF line and in its initial position.

[0034] Figure 13 This is an internal view of the double-acting pressure electric pump according to the third embodiment of this utility model.

[0035] Figure 14 yes Figure 13The diagram shown is an exploded three-dimensional view of a double-acting electric pump. Detailed Implementation

[0036] To explain the technical content and structural features of this utility model in detail, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0037] Please see Figure 1 As an example, the dual-acting electric pump 100 of the first embodiment can be applied to a sphygmomanometer to pump gas into the sphygmomanometer's bladder.

[0038] Combined Figure 2 , Figure 4 and Figure 7 The first embodiment of the double-acting electric pump 100 includes a check valve 10, a pump body 20 having an internal cavity 21, and a first diaphragm valve 30, a vibrator 40, and a second diaphragm valve 50 arranged horizontally in the cavity 21 and sequentially spaced apart along a first direction (see arrow A). The first diaphragm valve plate 30, the vibrator 40, and the second diaphragm valve plate 50 are also sealed to the pump body 20 to prevent leakage at the connection points between the upper pump body 20 and the first diaphragm valve plate 30, the vibrator 40, and the second diaphragm valve plate 50. The first diaphragm valve plate 30, the vibrator 40, and the second diaphragm valve plate 50 also divide the cavity 21 into a first air inlet chamber 21a, a first pump chamber 21b, a second pump chamber 21c, and a second air inlet chamber 21d. Furthermore, the first diaphragm valve plate 30, the vibrator 40, and the second diaphragm valve plate 50 are arranged sequentially along the first direction, so that the first air inlet chamber 21a, the first pump chamber 21b, the second pump chamber 21c, and the second air inlet chamber 21d are also arranged sequentially along the first direction.

[0039] Meanwhile, 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 by the first air inlet 31. Optionally, in Figure 2 In this example, the first air inlet 31 is circular to facilitate its manufacturing on the first diaphragm valve plate 30. Obviously, depending on actual needs, the shape of the first air inlet 31 can also be elliptical or polygonal; therefore, it is not considered a specific shape. Figure 2 The following is a limitation. The second diaphragm valve plate 50 has 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 by the second air inlet 51; alternatively, in Figure 2 In this example, the second air inlet 51 is circular to facilitate its manufacturing on the second diaphragm valve plate 50. Obviously, depending on actual needs, the shape of the second air inlet 51 can also be elliptical or polygonal; therefore, it is not considered a specific shape. Figure 2 The above is the limit.

[0040] Furthermore, the pump body 20 is provided with an external discharge channel 22, a first air intake channel 23 communicating with the first air intake chamber 21a, a second air intake channel 24 communicating with the second air intake chamber 21d, a first air outlet channel 25 communicating with the first pump chamber 21b, a second air outlet channel 26 communicating with the second pump chamber 21c, a first protrusion 27 protruding towards the first diaphragm valve plate 30, and a second protrusion 28 protruding towards the second diaphragm valve plate 50. The external discharge channel 22 is respectively connected to the first air outlet channel 25 and the second air outlet channel 26 to meet the need for 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 the volume of the first pump chamber 21b, and to meet the need for 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 the volume of the second pump chamber 21c.

[0041] The check valve 10 is located on the pump body 20, which provides support for the check valve 10 and serves as the assembly location. The check valve 10 also prevents the gas in the exhaust channel 22 from flowing back into the first exhaust channel 25 and the second exhaust channel 26.

[0042] Therefore, during the deformation and displacement of the vibrator 40 towards the first protrusion 27, the vibrator 40 causes the first protrusion 27 to be in clearance fit with the first air inlet 31, and the vibrator 40 also causes the second protrusion 28 to disengage from the clearance fit with the second air inlet 51, as shown in the figure. Figure 5 As shown; and in Figure 5 In the process, the gas inside the first pump chamber 21b is compressed due to the reduced volume, causing the compressed gas to pass through the first outlet channel 25, open the check valve 10, and then be discharged from the outer discharge channel 22. Simultaneously, the second pump chamber 21c expands, creating a negative pressure that draws in gas from the second inlet chamber 21d. The gas flow direction is shown in [details omitted]. Figure 5 As indicated by the dashed arrow.

[0043] During the deformation and displacement of the vibrator 40 towards the second protrusion 28, the vibrator 40 causes the first protrusion 27 to disengage from the clearance fit with the first air inlet 31, and the vibrator 40 also causes the second protrusion 28 to have a clearance fit with the second air inlet 51, as shown in the figure. Figure 6 As shown; and in Figure 6 In the process, due to the expansion of the volume of the first pump chamber 21b, a negative pressure is formed, drawing in gas from the first intake chamber 21a. Simultaneously, due to the reduction of the volume of the second pump chamber 21c, the gas within it is compressed. The compressed gas then passes through the second outlet passage 26, opens the check valve 10, and is discharged from the outer exhaust passage 22. The gas flow direction is shown in [details omitted]. Figure 5 As indicated by the dashed arrow. More specifically, as follows:

[0044] like Figures 4 to 7 As shown, as an example, the exhaust channel 22 has a first frustum cavity 221 for communicating with the first exhaust channel 25 and the second exhaust channel 26. Correspondingly, the pump body 20 has a frustum structure 29a protruding from the first frustum cavity 221. Optionally, in... Figure 7 In the example, the center lines of the first frustum cavity 221 and the frustum structure 29a are shown in the figure. Figure 7 The center lines of the two structures are aligned to ensure that the gaps between the first frustum cavity 221 and the frustum structure 29a are the same at all points. This provides more space for the check valve 10 to open the first and second air outlet channels 25 and 26 while ensuring a tighter fit between the two structures. The first and second air outlet channels 25 and 26 each extend to the side wall of the frustum structure 29a, as shown in the diagram. Figures 4 to 6 As shown. A second frustum cavity 11, matching the frustum structure 29a, is provided through the middle of the check valve 10. The check valve 10 is tightly fitted onto the frustum structure 29a via the second frustum cavity 11. The check valve 10 also selectively opens or blocks portions 251 (261) of both the first and second exhaust channels 25 and 26 on the side wall of the frustum structure 29a. This design allows one check valve 10 to handle the opening or blocking of portions 251 of the first exhaust channel 25 and 261 of the second exhaust channel 26, thus reducing the number of check valves 10 used. Specifically, in Figure 2 and Figures 4 to 7 As an example, the check valve 10 includes an annular base 10a and an annular cone 10b connected to and coaxially arranged with the annular base 10a. A second frustum cavity 11 penetrates the annular base 10a and the annular cone 10b. The wall thickness of the annular cone 10b is less than the wall thickness of the annular base 10a. Therefore, the thicker annular base 10a is sealed and clamped between the cover 20a and the first cover plate 20b, as described below, allowing the check valve 10 to be reliably fixed to the pump body 20. The thinner annular cone 10 tightly engages with the frustum structure 29a, facilitating the opening or blocking of the portion 251 of the first air outlet passage 25 and the portion 261 of the second air outlet passage 26. More specifically, as an example, the check valve 10 is a high-resilience valve, and the material can be selected from high-resilience materials such as rubber or 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. Correspondingly, the first air outlet channel 25 and the second air outlet channel 26 are arranged opposite each other with the frustum structure 29a as the center. For example, in Figure 2In this structure, the first air outlet channel 25 is located on the right side of the frustum structure 29a, and the second air outlet channel 26 is located on the left side of the frustum structure 29a. Obviously, their positions can be interchanged according to actual needs, therefore, they are not considered interchangeable. Figure 2 The above is for reference only. Furthermore, 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 each other with the frustum structure 29a as the center, making their design at the pump body 20 reasonable and compact.

[0046] like Figures 4 to 6 As shown, as an example, the double-acting electric pump 100 of the first embodiment further includes a first connecting channel 60 and a second connecting channel 70. The first connecting channel 60 extends through the first diaphragm valve plate 30 along a first direction and extends within the pump body 10. The air outlet 212 of the first pump chamber 21b is connected to the first air outlet channel 25 via the first connecting channel 60. The second connecting channel 70 extends through the first diaphragm valve plate 30 and the vibrator 40 along the first direction and extends within the pump body 20. The air outlet 212 of the second pump chamber 21c is connected to the second air outlet channel 26 via the second connecting channel 70. Therefore, the first connecting channel 60 and the second connecting channel 70 facilitate 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 within the pump body 20. Furthermore, regarding... Figure 7 As an example, the pump body 20 is also provided with an external inlet channel 29b for external gas to enter the first air inlet channel 23 and the second air inlet channel 24.

[0047] like Figure 2 and Figures 4 to 7As shown, as an example, the vibrator 40 includes a vibrating plate 41 and a piezoelectric ceramic plate 42. The vibrating plate 41 includes an outer connecting portion 411 for sealing connection with the pump body 20, a flat portion 412 surrounded by the outer connecting portion 411, and a corrugated suspension portion 413 connecting the flat portion 412 and the outer connecting portion 411. The piezoelectric ceramic plate 42 is fixed at the flat portion 412. Therefore, the stability of the piezoelectric ceramic plate 42 and the vibrating plate 41 is improved by means of the flat portion 412. For example, the piezoelectric ceramic plate 42 can be glued to the flat portion 412. In addition, the corrugated suspension portion 413 can withstand a large deformation displacement. Specifically, as an example, the vibrating plate 41 can be made of copper alloys such as phosphor bronze, beryllium copper, or stainless steel, which are conductive metals with good elasticity. The two end faces of the piezoelectric ceramic sheet 42 are two electrodes. The vibrating plate 41 serves as one electrode of the piezoelectric ceramic sheet 42, and an electrode lug 421 is welded to the other side of the piezoelectric ceramic sheet 42 and led out to the outside. This electrode lug 421 can be made of a conductive metal material. Additionally, the external connection portion 411 of the vibrating plate 41 is provided with an external lug 414. Therefore, when an alternating voltage is applied to the electrode lug 421 and the external lug 414, the piezoelectric ceramic sheet 42 undergoes stretching and contraction deformation due to the inverse piezoelectric effect, thereby driving the vibrator 40 to vibrate up and down. More specifically, the corrugated suspension portion 413 of the vibrating plate 41 can be manufactured using a stamping process, but is not limited to this.

[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 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 sequentially and fixed together along a first direction. A first diaphragm valve 30 is sealed between the first cover plate 20b and the first middle plate 20c; a vibrator 40 is sealed between the first middle plate 20c and the second middle plate 20d; a second diaphragm valve 50 is sealed between the second middle plate 20d and the second cover plate 20e; and a check valve 10 is sealed between the cover 20a and the first cover plate 20b. This design facilitates the installation and operation of the first diaphragm valve 30, the vibrator 40, the second diaphragm valve 50, and the check valve 10 at the pump body 20. Specifically, in... Figures 4 to 7 In this example, the external discharge channel 22 extends along a first direction and penetrates the cover 20a to facilitate the manufacturing of the external discharge channel 22 within the cover 20a; the frustum structure 29a is located on the first cover plate 20b to facilitate the manufacturing of the frustum structure 29a within the first cover plate 20b; the first venting channel 25 and the second venting channel 26 are each enclosed by the cover 20a and the first cover plate 20b to facilitate the opening of the first venting channel 25 and the second venting channel 26, for example, in... Figure 2 and Figures 4 to 6In the pump body 20, the first air outlet channel 25 and the second air outlet channel 26 are formed on the first cover plate 20b and face the cover body 20a. The cover body 20a closes the open portions of the first air outlet channel 25 and the second air outlet channel 26 facing the cover body 20a, thus facilitating the machining 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 each enclosed by the first cover plate 20b and the first diaphragm valve plate 30, so as to facilitate the connection between 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 intake chamber 21d and the second air intake channel 24 are each enclosed 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 intake chamber 21d and the second air intake channel 24 on the second cover plate 20e; the first pump chamber 21b is enclosed by the first diaphragm valve plate 30, the first middle plate 20c and the vibrator 40; the second pump chamber 21c is enclosed by the vibrator 40, the second middle plate 20d and the second diaphragm valve plate 50. Specifically, as an example, the first diaphragm valve plate 30 and the second diaphragm valve plate 50 can be made of metal materials with good elasticity, such as copper alloy or stainless steel; the first intermediate plate 20c can be a plastic part, so that the first intermediate plate 20c can be manufactured by injection molding and has insulating properties, used for the electrical connection between the insulating electrode wiring lug 421 and the vibrating plate 41; the second intermediate plate 20d is a metal part, so that the second intermediate plate 20d has good heat dissipation performance and dissipates heat outward. Optionally, in Figures 1 to 3 In this example, the second middle plate 20d is arranged to protrude outward relative to the cover 20a, the first cover 20b, the first middle plate 20c, and the second cover 20e to achieve better heat dissipation. The cover 20a, the first cover 20b, and the second cover 20e can be plastic parts, such as PPS fiber reinforced or nylon fiber reinforced, so that the cover 20a, the first cover 20b, and the second cover 20e can be manufactured by injection molding.

[0049] It should be noted that when the pump body 20 includes a cover 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 sequentially and fixed together along the first direction, the outer connecting portion 411 of the vibrating plate 41 is correspondingly sealed and clamped between the first middle plate 20c and the second middle plate 20d; the first protrusion 27 is located on the first cover plate 20b, and the second protrusion 28 is located on the second cover plate 20e; the first connecting channel 60 passes through the first cover plate 20b and the first diaphragm valve plate 30 along the first direction; the second connecting channel 70 passes through the first cover plate 20b, the first diaphragm valve plate 30, the first middle plate 20c, and the vibrating plate 41 along the first direction; and the outer inlet channel 29b is located on the second cover plate 20e.

[0050] Please see Figures 8 to 12The structure of the double-acting electric pump 100' in the second embodiment is basically the same as that of the double-acting electric pump 100 in the first embodiment, with the following differences:

[0051] (1) In the double-acting electric pump 100' of the second embodiment, the air outlets 211 (212) of the first pump chamber 21b and the second pump chamber 21c are arranged diagonally. 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 each other with the frustum structure 29a as the center, and the two second air outlet channels 26 are arranged opposite each other with the frustum structure 29a as the center. In addition, there are two first air inlet channels 23 and they are arranged opposite each other with the first protrusion 27 as the center, and there are two second air inlet channels 24 and they are arranged opposite each other with the second protrusion 28 as the center. This design makes the pressure in the pump chamber of the double-acting electric pump 100' of the second embodiment balanced during operation, and at the same time reduces the pumping resistance, thereby improving the pumping efficiency more effectively.

[0052] In the first embodiment of the double-acting electric 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. In addition, the first air outlet channel 25 and the second air outlet channel 26 are arranged opposite each other with the frustum structure 29a as the center.

[0053] (2) In the double-acting electric pump 100' of the second embodiment, there is no external inlet channel 29b on its pump body 20. Correspondingly, the first air inlet channel 23 and the second air inlet channel 24 are directly exposed to the outside.

[0054] In the first embodiment of the double-acting electric pump 100, its pump body 20 is provided with an external inlet channel 29b, which is connected to the first air inlet channel 23 and the second air inlet channel 24 respectively.

[0055] Apart from the differences mentioned above, the two are the same, so they will not be repeated here.

[0056] Please see Figure 13 and Figure 14 The structure of the double-acting electric pump 100'' in the third embodiment is basically the same as that of the double-acting electric pump 100 in the first embodiment, with the following differences:

[0057] In the third embodiment of the dual-acting electric pump 100, the first air outlet channel 25 extends along the first direction and passes through the first protrusion 27, making the first air outlet channel 25 shorter; while in the first embodiment of the dual-acting electric pump 100, 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] Furthermore, the third embodiment of the double-acting electric pump 100 also eliminates the first connecting channel 60.

[0059] Apart from the differences mentioned above, the two are the same, so they will not be repeated here.

[0060] Compared with the prior art, during the deformation displacement of the vibrator 40 toward the first protrusion 27 (i.e., during the first half of the cycle), the deformed vibrator 40 reduces the volume of the first pump chamber 21b, thereby causing the gas in the first pump chamber 21b to push the first diaphragm valve plate 30 toward the first protrusion 27. As a result, the first protrusion 27 enters the first air inlet 31 and is in clearance fit with the first air inlet 31, thereby suppressing the backflow of gas in the first pump chamber 21b into the first air inlet chamber 21a. In addition, the compressed gas in the first pump chamber 21b passes through the first air outlet channel 25 and pushes open the check valve 10 to be pumped out from the external discharge channel 22. Meanwhile, in the first half of the 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 away from the second protrusion 28, thereby causing the second air inlet 51 of the second diaphragm valve plate 50 to disengage from the second protrusion 28, and thus allowing gas to enter the second pump chamber 21c from the second air inlet chamber 21d, while the outside gas enters the second air inlet chamber 21d through the second air inlet channel 24.

[0061] During the deformation displacement of the vibrator 40 toward the second protrusion 28 (i.e., during the second half of the cycle), the deformed vibrator 40 reduces the volume of the second pump chamber 21c, thereby causing the gas in the second pump chamber 21c to push the second diaphragm valve plate 50 toward the second protrusion 28. As a result, the second protrusion 28 enters the second air inlet 51 and is in clearance fit with the second air inlet 51, thereby suppressing the backflow of gas in the second pump chamber 21c into the second air inlet chamber 21d. In addition, the compressed gas in the second pump chamber 21c passes through the second air outlet channel 26 and pushes open the check valve 10 to be pumped out from the external discharge channel 22. Meanwhile, in the latter 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 away from the first protrusion 27, thereby causing the first air inlet 31 of the first diaphragm valve plate 30 to disengage from the first protrusion 27, and thus allowing gas to enter the first pump chamber 21b from the first air inlet chamber 21a, while external gas enters the first air inlet chamber 21a through the first air inlet channel 23.

[0062] Therefore, within one cycle of the vibrator 40, two intake and exhaust operations are completed, greatly improving pumping efficiency and exhaust flow rate, making it suitable for double-acting electric pumps in high-flow-rate applications; in addition, it is more compact while maintaining the same flow rate.

[0063] It is worth noting that in the above embodiments, 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 obstruction channels, etc., but are not limited thereto.

[0064] It should be noted that the direction pointed to by arrow A in the attached figure is the first direction, and the direction perpendicular to the first direction is the horizontal direction; in addition, the first air intake channel 23, the second air intake channel 24, the first air outlet channel 25 and the second air outlet channel 26 are also arranged along the horizontal direction.

[0065] The above-disclosed examples are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall fall within the scope of the present utility model.

Claims

1. A double-acting electric pump, characterized in that, The pump body includes a pump body with an internal cavity, and a first diaphragm valve plate, a vibrator, and a second diaphragm valve plate arranged horizontally within the cavity and sequentially spaced apart along a first direction. The first diaphragm valve plate, vibrator, and second diaphragm valve plate are also sealed to the pump body, correspondingly dividing the cavity into a first air inlet chamber, a first pump chamber, a second pump chamber, and a second air inlet chamber. The first diaphragm valve plate has a first air inlet for connecting the first air inlet chamber and the first pump chamber, and the second diaphragm valve plate has a second air inlet for connecting the second air inlet chamber and the second pump chamber. The pump body has an external discharge channel, a first air inlet channel communicating with the first air inlet chamber, and a second air inlet channel communicating with the second air inlet chamber. The system comprises two air inlet channels, a first air outlet channel communicating with the first pump chamber, a second air outlet channel communicating with the second pump chamber, a first protrusion protruding towards the first diaphragm valve plate, and a second protrusion protruding towards the second diaphragm valve plate. The exhaust channel is respectively connected to the first air outlet channel and the second air outlet channel. During the deformation and displacement of the vibrator towards the first protrusion, the first protrusion is made to engage with the first air inlet with a clearance and the second protrusion is made to disengage from the clearance engagement with the second air inlet. During the deformation and displacement of the vibrator towards the second protrusion, the first protrusion is made to disengage from the clearance engagement with the first air inlet and the second protrusion is made to engage with the second air inlet with a clearance.

2. The double-acting electric pump according to claim 1, characterized in that, It also includes a check valve disposed on the pump body and preventing gas in the exhaust channel from flowing back into the first and second exhaust channels; the exhaust channel has a first frustum cavity for communicating with the first and second exhaust channels, and the pump body is correspondingly provided with a frustum structure protruding from the first frustum cavity, the first and second exhaust channels each extending to the side wall of the frustum structure; the check valve has a second frustum cavity that matches the frustum structure through its middle, and the check valve is fitted tightly onto the frustum structure with the help of the second frustum cavity, and the check valve also selectively opens or blocks the portions of the first and second exhaust channels on the side wall of the frustum structure; the center lines of the first frustum cavity and the frustum structure coincide.

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

4. The double-acting electric 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 each other with the frustum structure as the center, and the two second air outlet channels are arranged opposite each other with the frustum structure as the center.

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

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

7. The double-acting electric pump according to claim 1, characterized in that, The vibrator includes a vibrating plate and a piezoelectric ceramic sheet. The vibrating plate includes an outer connecting portion for sealing connection with the pump body, a flat portion surrounded by the outer connecting portion, and a corrugated suspension portion connecting the flat portion and the outer connecting portion. The piezoelectric ceramic sheet is fixed to the flat portion.

8. The double-acting electric 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 and second inlet channels; the check valve includes an annular base and an annular cone connected to and coaxially arranged with the annular base, the second frustum cavity penetrates the annular base and the annular cone, and the wall thickness of the annular cone is less than the wall thickness of the annular base.

9. The double-acting electric pump according to claim 2, characterized in that, The pump body includes a cover, a first cover plate, a hollow first middle plate, a hollow second middle plate, and a second cover plate arranged sequentially and fixed together along the first direction. The first diaphragm valve is sealed between the first cover plate and the first middle plate. The vibrator is sealed between the first middle plate and the second middle plate. The second diaphragm valve is sealed between the second middle plate and the second cover plate. The check valve is sealed between the cover and the first cover plate.

10. The double-acting electric pump according to claim 9, characterized in that, The external discharge channel extends along the first direction and penetrates the cover. The frustum structure is located on the first cover plate. The first and second air outlet channels are each enclosed by the cover and the first cover plate. The first air inlet chamber and the first air inlet channel are each enclosed by the first cover plate and the first diaphragm valve. The second air inlet chamber and the second air inlet channel are each enclosed by the second diaphragm valve and the second cover plate. The first pump chamber is enclosed by the first diaphragm valve, the first middle plate, and the vibrator. The second pump chamber is enclosed by the vibrator, the second middle plate, and the second diaphragm valve.

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