A miniature diaphragm air pump

Abstract

This utility model discloses a miniature diaphragm air pump, including a top cover, a valve seat, a piston seat, a base, and a drive mechanism. The top cover is provided with an air inlet and an air outlet. It also includes at least one set of working systems that cooperate with the drive mechanism. Each set of working systems includes a first piston and a second piston mounted on the piston seat, and a first valve, a second valve, and a third valve mounted on the valve seat. The first piston cooperates with the air inlet and is equipped with two first and second valves in opposite directions. The second piston cooperates with the air outlet and is equipped with a third valve in the same direction as the first valves. The gas output from the air outlet of this miniature diaphragm air pump has undergone two pressurizations, resulting in an output gas pressure more than double that of traditional pumps. This broadens the product's application range, increases pneumatic efficiency, and offers strong applicability and practicality, meeting more complex usage scenarios and needs.

Description

Technical Field

[0001] This utility model belongs to the field of air pump technology, specifically a miniature diaphragm air pump. Background Technology

[0002] Miniature diaphragm air pumps are widely used in industries such as medical and health, instrumentation, automotive, chemical, and scientific research for purposes such as air extraction, air inflation, vacuuming, pressurization, gas circulation, and gas sampling. A typical diaphragm air pump uses a motor-driven shaft to drive an eccentric wheel mechanism that pulls or compresses the diaphragm, changing the volume of the air bladder formed by the valve seat and diaphragm. This, combined with the actions of inlet and outlet check valves, enables air intake and exhaust.

[0003] As shown in the patent document with publication number CN201747572U, existing miniature diaphragm air pumps generally have a pair of valves for each piston chamber (the air bladder formed by the valve seat and the diaphragm) to control the gas inlet and outlet. Due to this structure, the existing miniature diaphragm air pumps have the following disadvantages:

[0004] 1. Gas enters from one piston chamber and exits from another piston chamber. The gas is compressed only once during the transportation process, and the gas pressure output from the outlet is generally low.

[0005] 2. The diaphragm is usually distributed on both sides of the eccentric wheel, which causes uneven force on the eccentric wheel when it rotates in a circle, resulting in a short service life and large vibration and noise during operation.

[0006] 3. There is only one working system, and the gas flow of a single working system is output in the form of pulses, resulting in poor continuity and stability. Utility Model Content

[0007] In view of the above situation and to overcome the defects of the prior art, this utility model provides a miniature diaphragm air pump, which effectively solves one of the problems in the prior art mentioned in the background.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a miniature diaphragm air pump, comprising a top cover, a valve seat, a piston seat, a base, and a drive mechanism. The top cover is provided with an air inlet and an air outlet. It also includes at least one set of working systems that cooperate with the drive mechanism. Each set of working systems includes a first piston and a second piston mounted on the piston seat, and a first valve, a second valve, and a third valve mounted on the valve seat. The first piston cooperates with the air inlet and is equipped with two first valves and a second valve in opposite directions. The second piston cooperates with the air outlet and is equipped with a third valve in the same direction as the first valve. Under the action of the drive mechanism, the volume change of the first piston causes the first valve to open, and gas enters the inner cavity of the first piston from the air inlet. The volume change of the first piston causes the first valve to close and the second valve to open. After being compressed by the first piston, the gas is transported from the inner cavity of the first piston to the inner cavity of the second piston. Then, the volume change of the second piston drives the third valve to open, and the gas is compressed again by the second piston and output from the air outlet.

[0009] Preferably, the miniature diaphragm air pump further includes an air inlet chamber, an air outlet chamber, and a connecting channel formed by the upper cover and the valve seat. The air inlet chamber is connected to the air inlet nozzle, the air outlet chamber is connected to the air outlet nozzle, and the connecting channel is connected to the inner cavity of the first piston and the inner cavity of the second piston, respectively.

[0010] Preferably, the valve seat has a first mounting groove and a first air inlet, the first air inlet is connected to the inner cavity of the first piston and the air inlet cavity respectively, and the first valve is installed in the first mounting groove and can open or block the first air inlet under the action of the first piston.

[0011] Preferably, the valve seat is provided with a second mounting groove, a second air inlet and a first air outlet. The first air outlet is connected to the inner cavity of the first piston and the connecting channel, respectively. The second air inlet is connected to the inner cavity of the second piston and the connecting channel, respectively. The second valve is installed in the second mounting groove and can open or block the first air outlet under the action of the first piston.

[0012] Preferably, the valve seat is provided with a third mounting groove and a second vent hole. The second vent hole is connected to the inner cavity of the second piston and the vent cavity, respectively. The third valve is installed in the third mounting groove and can open or block the second vent hole under the action of the second piston.

[0013] Preferably, the drive mechanism includes a drive component and a transmission assembly. The transmission assembly includes a transmission component, a transmission shaft, and an eccentric wheel. The eccentric wheel is fitted onto the drive end of the drive component. The transmission component is connected to the eccentric wheel via the transmission shaft. The transmission component cooperates with the first piston and the second piston of the working system and can drive the first piston and the second piston to deform under the drive of the drive component.

[0014] Preferably, the working system consists of two sets, with the first and second pistons of the two sets of working systems symmetrically arranged on the outer periphery of the transmission component.

[0015] Preferably, the transmission component includes a body and a protrusion extending outward from the body. One end of the transmission shaft is fitted onto the body, and the other end is fitted onto an eccentric wheel. A first rod-shaped portion is provided at the bottom of the first piston, and a second rod-shaped portion is provided at the bottom of the second piston. The protrusion is fitted onto the outer periphery of the first rod-shaped portion or the second rod-shaped portion, and the number of protrusions is equal to the sum of all first rod-shaped portions and all second rod-shaped portions.

[0016] Therefore, this utility model sets up two symmetrically distributed working systems, including a total of four piston structures (two first pistons and two second pistons). The four piston structures are evenly distributed in a circular array on the outer periphery of the transmission component. This ensures that the eccentric wheel of the drive mechanism and the transmission component are subjected to force balance during operation, reducing the wear and tear on the eccentric wheel and transmission component and increasing their service life. The evenly distributed circular array of the four piston structures also ensures force balance during operation, reducing vibration and noise. In operation, the outlet flow rate of the dual working system has increased continuity and stability compared to the single system.

[0017] Preferably, the inner wall of the air outlet is provided with a stepped silencing structure. This creates a stepped silencing channel inside the air outlet, effectively eliminating the whistling sound from the air outlet.

[0018] Preferably, the miniature diaphragm air pump also includes an elastic element, a valve seat, a piston seat, and a base that are fixedly connected, and a top cover that is detachably connected to the valve seat. One end of the elastic element is engaged with the base, and the other end is engaged with the top cover.

[0019] The beneficial effects of this utility model are as follows:

[0020] 1. The gas output from the outlet nozzle of this utility model has undergone two pressurizations, and the output gas pressure is more than double that of the traditional type. This broadens the application scope of the product, increases the efficiency of pneumatic work, and has strong applicability and practicality, which can meet more and more complex usage scenarios and needs.

[0021] 2. Two sets of symmetrically distributed working systems are set up, including a total of four piston structures. The four piston structures are evenly distributed in a circular array on the outer periphery of the transmission components. This uses the eccentric wheel of the drive mechanism and the transmission components to balance the forces during operation, reducing the wear of the eccentric wheel and transmission components during operation and increasing their service life.

[0022] 3. The four-piston structure is evenly distributed in a circular array, which balances the forces during operation and reduces vibration and noise;

[0023] 4. In operation, the continuity and stability of the outflow of the dual-working system are increased compared to the single-working system.

[0024] 5. The air outlet is designed with a stepped silencer channel to eliminate the whistling sound of the air outlet and further reduce noise. Attached Figure Description

[0025] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0026] In the attached diagram:

[0027] Figure 1 This is a three-dimensional structural diagram of the miniature diaphragm air pump according to Embodiment 1 of this utility model;

[0028] Figure 2 for Figure 1 A three-dimensional structural diagram of the miniature diaphragm air pump shown from another angle;

[0029] Figure 3 for Figure 1 The diagram shows a top view of the structure of a miniature diaphragm air pump.

[0030] Figure 4 for Figure 3 A schematic diagram of the cross-sectional structure of the miniature diaphragm air pump along the AA direction is shown.

[0031] Figure 5 for Figure 1 One of the exploded structural diagrams of a miniature diaphragm air pump is shown.

[0032] Figure 6 for Figure 1 The second schematic diagram of the exploded structure of the miniature diaphragm air pump shown;

[0033] Figure 7 for Figure 3 A schematic diagram of another cross-sectional structure of the miniature diaphragm air pump shown;

[0034] Figure 8 A three-dimensional structural diagram of the valve seat of this utility model equipped with a partial piston;

[0035] Figure 9 This is one of the three-dimensional structural schematic diagrams of the valve seat of this utility model;

[0036] Figure 10 This is the second three-dimensional structural schematic diagram of the valve seat of this utility model;

[0037] Figure 11 This is a three-dimensional structural diagram of the upper cover of the miniature diaphragm air pump according to Embodiment 2 of this utility model;

[0038] Figure 12 for Figure 11The diagram shows a cross-sectional view of the top cover.

[0039] In the diagram: 1-Top cover; 2-Valve seat; 3-Piston seat; 4-Base; 5-Drive mechanism; 6-Working system; 7-Inlet nozzle; 8-Outlet nozzle; 9-Elastic element; 10-Inlet chamber; 11-Outlet chamber; 12-Connecting channel; 21-First mounting slot; 22-Second mounting slot; 23-Third mounting slot; 24-First air inlet; 25-Second air inlet; 26-First air outlet; 27-Second air outlet; 51-Driver; 52-Transmission assembly; 61-First piston; 62-Second piston; 63-First valve; 64-Second valve; 65-Third valve; 81-Stepped silencer structure; 521-Transmission element; 522-Transmission shaft; 523-Eccentric wheel; 611-First rod-shaped part; 621-Second rod-shaped part; 521a-Body; 521b-Protrusion. Detailed Implementation

[0040] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0041] Example 1, by Figures 1 to 10 The miniature diaphragm air pump of this embodiment includes an upper cover 1, a valve seat 2, a piston seat 3, a base 4, and a drive mechanism 5. The upper cover 1 is provided with an air inlet 7 and an air outlet 8. It also includes at least one set of working systems 6 that cooperate with the drive mechanism 5. Each set of working systems 6 includes a first piston 61 and a second piston 62 mounted on the piston seat 3, and a first valve 63, a second valve 64, and a third valve 65 mounted on the valve seat 2. The first piston 61 cooperates with the air inlet 7 and is equipped with two first valves 63 and second valves 64 in opposite directions. The second piston 62 cooperates with the air outlet 8 and is equipped with a first valve 63 and a second valve 64 in opposite directions. A third valve 65, which is in the same direction as the first valve 63, is driven by the drive mechanism 5. The first piston 61 changes volume (expands volume), causing the first valve 63 to open. Gas enters the inner cavity of the first piston 61 from the inlet nozzle 7. The first piston 61 changes volume (shrinks volume), causing the first valve 63 to close and the second valve 64 to open. After being compressed by the first piston 61, the gas is transported from the inner cavity of the first piston 61 to the inner cavity of the second piston 62. Then, the second piston 62 changes volume (shrinks volume), causing the third valve 65 to open. After being compressed again by the second piston 62, the gas is output from the outlet nozzle 8.

[0042] As a further preferred embodiment, the first valve 63, the second valve 64, and the third valve 65 are umbrella valves.

[0043] Preferably, the miniature diaphragm air pump further includes an air inlet chamber 10, an air outlet chamber 11, and a connecting channel 12 formed by the upper cover 1 and the valve seat 2. The air inlet chamber 10 communicates with the air inlet nozzle 7, the air outlet chamber 11 communicates with the air outlet nozzle 8, and the connecting channel 12 communicates with the inner cavities of the first piston 61 and the second piston 62, respectively. The air inlet chamber 10, the air outlet chamber 11, and the connecting channel 12 are integrally formed between the upper cover 1 and the valve seat 2.

[0044] Preferably, the valve seat 2 is provided with a first mounting groove 21 and a first air inlet 24. The first air inlet 24 is connected to the inner cavity of the first piston 61 and the air inlet cavity 10 respectively. The first valve 63 is installed in the first mounting groove 21 and can open or block the first air inlet 24 under the action of the first piston 61.

[0045] As a further preferred embodiment, there are multiple first air inlets 24, with one first air inlet 24 located at the center of the first mounting groove 21, and multiple other first air inlets 24 surrounding the outer periphery of the first air inlet 24.

[0046] Preferably, the valve seat 2 is provided with a second mounting groove 22, a second air inlet 25 and a first air outlet 26. The first air outlet 26 is connected to the inner cavity of the first piston 61 and the connecting channel 12, respectively. The second air inlet 25 is connected to the inner cavity of the second piston 62 and the connecting channel 12, respectively. The second valve member 64 is installed in the second mounting groove 22 and can open or block the first air outlet 26 under the action of the first piston 61.

[0047] As a further preferred embodiment, there are multiple first vent holes 26, one of which is located at the center of the second mounting groove 22, and the other multiple first vent holes 26 surround the outer periphery of the first vent hole 26.

[0048] Preferably, the valve seat 2 is provided with a third mounting groove 23 and a second vent hole 27. The second vent hole 27 is connected to the inner cavity of the second piston 62 and the vent chamber 11, respectively. The third valve component 65 is installed in the third mounting groove 23 and can open or block the second vent hole 27 under the action of the second piston 62.

[0049] As a further preferred embodiment, there are multiple second vent holes 27, one of which is located at the center of the third mounting groove 23, and the other multiple second vent holes 27 surround the outer periphery of the second vent hole 27.

[0050] Preferably, the drive mechanism 5 includes a drive member 51 and a transmission assembly 52. ​​The transmission assembly 52 includes a transmission member 521, a transmission shaft 522, and an eccentric wheel 523. The eccentric wheel 523 is fitted onto the drive end of the drive member 51. The transmission member 521 is connected to the eccentric wheel 523 via the transmission shaft 522. The transmission member 521 cooperates with the first piston 61 and the second piston 62 of the working system 6 and can drive the first piston 61 and the second piston 62 to deform under the drive of the drive member 51.

[0051] As a further preferred embodiment, the driving component 51 is a motor and the transmission component 521 is designed in a cross shape.

[0052] Preferably, the working system 6 consists of two sets, with the first piston 61 and the second piston 62 of the two sets of working systems 6 symmetrically arranged on the outer periphery of the transmission member 521. The two first pistons 61 and the two second pistons 62 of the two sets of working systems 6 together form a four-in-one diaphragm member. The piston portion of this four-in-one diaphragm member is fitted onto the piston seat 3, and the upper flange is pressed between the valve seat 2 and the piston seat 3.

[0053] Preferably, the transmission component 521 includes a body 521a and a protrusion 521b extending outward from the body 521a. One end of the transmission shaft 522 is fitted onto the body 521a, and the other end is fitted onto the eccentric wheel 523. The bottom of the first piston 61 is provided with a first rod-shaped portion 611, and the bottom of the second piston 62 is provided with a second rod-shaped portion 621. The protrusion 521b is fitted onto the outer periphery of the first rod-shaped portion 611 or the second rod-shaped portion 621, and the number of protrusions 521b is equal to the sum of all the first rod-shaped portions 611 and all the second rod-shaped portions 621.

[0054] Therefore, this utility model sets up two symmetrically distributed working systems 6, including a total of four piston structures (two first pistons 61 and two second pistons 62). The four piston structures are evenly distributed in a circular array on the outer periphery of the transmission component 521. This ensures that the eccentric wheel 523 of the drive mechanism 5 and the transmission component 521 are balanced in force during operation, reducing the wear and tear on the eccentric wheel 523 and the transmission component 521 during operation and increasing their service life. The evenly distributed circular array of the four piston structures also ensures balanced force during operation, reducing vibration and noise. In operation, the outlet flow of the dual working system 6 has increased continuity and stability compared to the single system.

[0055] Preferably, the miniature diaphragm air pump also includes an elastic element 9, a valve seat 2, a piston seat 3, and a base 4 that are fixedly connected, and an upper cover 1 that is detachably connected to the valve seat 2. One end of the elastic element 9 is engaged with the base 4, and the other end is engaged with the upper cover 1.

[0056] The outlet gas pressure of the micro diaphragm air pump of this invention was compared with that of the existing micro diaphragm air pump. The test results are as follows: the outlet gas pressures of the existing micro diaphragm air pump were measured to be 100 kPa, 110 kPa, 115 kPa, 110 kPa, and 100 kPa, while the outlet gas pressures of the micro diaphragm air pump of this invention were measured to be 200 kPa, 215 kPa, 220 kPa, 215 kPa, and 205 kPa.

[0057] Example 2, by Figures 11 to 12 It is shown that the structure of the miniature diaphragm air pump in this embodiment is basically the same as that of the miniature diaphragm air pump in Embodiment 1, the difference being that the air outlet 8 is different.

[0058] like Figure 11-12 As shown, the inner wall of the air outlet 8 of the miniature diaphragm air pump in this embodiment is provided with a stepped silencing structure 81. Thus, a stepped silencing channel is formed inside the air outlet 8, which can effectively eliminate the whistling sound from the air outlet.

[0059] The beneficial effects of this utility model are as follows:

[0060] 1. The gas output from the gas outlet 8 of this utility model has undergone two pressurizations, and the output gas pressure is more than double that of the traditional type. This broadens the application scope of the product, increases the efficiency of pneumatic work, and has strong applicability and practicality, which can meet more and more complex usage scenarios and needs.

[0061] 2. Two sets of symmetrically distributed working systems 6 are set up, including a total of four piston structures. The four piston structures are evenly distributed in a circular array on the outer periphery of the transmission component 521. This ensures that the eccentric wheel 523 of the drive mechanism 5 and the transmission component 521 are balanced in force during operation, reducing the wear of the eccentric wheel 523 and the transmission component 521 during operation and increasing their service life.

[0062] 3. The four-piston structure is evenly distributed in a circular array, which balances the forces during operation and reduces vibration and noise;

[0063] 4. In operation, the dual-system 6 exhibits increased continuity and stability of outflow compared to the single-system flow.

[0064] 5. The air outlet nozzle 8 is designed with a stepped silencer channel to eliminate the whistling sound of the air outlet and further reduce noise.

[0065] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0066] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A miniature diaphragm air pump, comprising a top cover (1), a valve seat (2), a piston seat (3), a base (4), and a drive mechanism (5), wherein the top cover (1) is provided with an air inlet (7) and an air outlet (8), characterized in that, It also includes at least one set of working systems (6) that cooperate with the drive mechanism (5), each set of working systems (6) includes a first piston (61) and a second piston (62) installed on the piston seat (3) and a first valve (63), a second valve (64) and a third valve (65) installed on the valve seat (2); The first piston (61) is matched with the air inlet (7) and is equipped with two first valves (63) and second valves (64) in opposite directions. The second piston (62) is matched with the air outlet (8) and is equipped with a third valve (65) in the same direction as the first valve (63). It also includes an air inlet chamber (10), an air outlet chamber (11), and a connecting channel (12). The air inlet chamber (10) is connected to the air inlet nozzle (7), the air outlet chamber (11) is connected to the air outlet nozzle (8), and the connecting channel (12) is connected to the inner cavity of the first piston (61) and the inner cavity of the second piston (62), respectively. Under the action of the drive mechanism (5), the volume change of the first piston (61) causes the first valve (63) to open, and the gas enters the inner cavity of the first piston (61) from the air inlet (7). The volume change of the first piston (61) causes the first valve (63) to close and the second valve (64) to open. After being compressed by the first piston (61), the gas is transported from the inner cavity of the first piston (61) to the inner cavity of the second piston (62). Then, the volume change of the second piston (62) drives the third valve (65) to open. After being compressed again by the second piston (62), the gas is output from the air outlet (8).

2. The miniature diaphragm air pump according to claim 1, characterized in that, The air inlet chamber (10), air outlet chamber (11), and connecting channel (12) are located between the upper cover (1) and the valve seat (2). The air inlet chamber (10), air outlet chamber (11), and connecting channel (12) are integrally formed between the upper cover (1) and the valve seat (2).

3. The miniature diaphragm air pump according to claim 2, characterized in that, The valve seat (2) is provided with a first mounting groove (21) and a first air inlet (24). The first air inlet (24) is connected to the inner cavity of the first piston (61) and the air inlet cavity (10) respectively. The first valve (63) is installed in the first mounting groove (21) and can open or block the first air inlet (24) under the action of the first piston (61).

4. The miniature diaphragm air pump according to claim 3, characterized in that, The valve seat (2) is provided with a second mounting groove (22), a second air inlet (25) and a first air outlet (26). The first air outlet (26) is connected to the inner cavity of the first piston (61) and the connecting channel (12) respectively. The second air inlet (25) is connected to the inner cavity of the second piston (62) and the connecting channel (12) respectively. The second valve (64) is installed in the second mounting groove (22) and can open or block the first air outlet (26) under the action of the first piston (61).

5. The miniature diaphragm air pump according to claim 4, characterized in that, The valve seat (2) is provided with a third mounting groove (23) and a second vent hole (27). The second vent hole (27) is connected to the inner cavity of the second piston (62) and the vent cavity (11) respectively. The third valve component (65) is installed in the third mounting groove (23) and can open or block the second vent hole (27) under the action of the second piston (62).

6. The miniature diaphragm air pump according to any one of claims 1-5, characterized in that, The drive mechanism (5) includes a drive member (51) and a transmission assembly (52). The transmission assembly (52) includes a transmission member (521), a transmission shaft (522), and an eccentric wheel (523). The eccentric wheel (523) is fitted onto the drive end of the drive member (51). The transmission member (521) is connected to the eccentric wheel (523) via the transmission shaft (522). The transmission member (521) cooperates with the first piston (61) and the second piston (62) of the working system (6) and can drive the first piston (61) and the second piston (62) to deform under the drive of the drive member (51).

7. The miniature diaphragm air pump according to claim 6, characterized in that, The working system (6) consists of two sets, with the first piston (61) and the second piston (62) of the two sets of working systems (6) symmetrically arranged on the outer periphery of the transmission member (521).

8. The miniature diaphragm air pump according to claim 7, characterized in that, The transmission component (521) includes a body (521a) and a protrusion (521b) extending outward from the body (521a). One end of the transmission shaft (522) is fitted onto the body (521a), and the other end is fitted onto the eccentric wheel (523). The bottom of the first piston (61) is provided with a first rod-shaped portion (611), and the bottom of the second piston (62) is provided with a second rod-shaped portion (621). The protrusion (521b) is fitted onto the outer periphery of the first rod-shaped portion (611) or the second rod-shaped portion (621). The number of protrusions (521b) is equal to the sum of all the first rod-shaped portions (611) and all the second rod-shaped portions (621).

9. The miniature diaphragm air pump according to any one of claims 1-5, characterized in that, The inner wall of the air outlet (8) is provided with a stepped sound-absorbing structure (81).

10. The miniature diaphragm air pump according to any one of claims 1-5, characterized in that, It also includes an elastic element (9), the valve seat (2), the piston seat (3), and the base (4) are fixedly connected, the upper cover (1) is detachably connected to the valve seat (2), one end of the elastic element (9) cooperates with the base (4), and the other end cooperates with the upper cover (1).

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