Miniature diaphragm vacuum pump

Abstract

The utility model belongs to the technical field of miniature vacuum pumps, and particularly relates to a miniature diaphragm vacuum pump which comprises a pump body assembly, a pressurization sealing assembly, a piston assembly and a driving assembly, and the pump body assembly comprises a pump shell provided with an extraction opening and an upper cover provided with an exhaust opening; the pressurization sealing assembly comprises a one-way base arranged between the pump shell and the upper cover, and a cavity between the upper cover and the one-way base is divided into an air inlet cavity and an air outlet cavity through a spacer ring structure. The piston assembly is arranged between the one-way base and the pump shell to form a piston outer cavity and at least one piston inner cavity; according to the utility model, the structure of the miniature diaphragm vacuum pump is improved, so that the interior of the miniature diaphragm vacuum pump passes through a gas channel formed by sequentially connecting the extraction opening, the piston outer cavity below the one-way base, the gas inlet cavity above the one-way base, the piston inner cavity below the one-way base, the gas outlet cavity above the one-way base and the exhaust port, and noise is effectively reduced.

Description

Technical Field

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

[0002] A vacuum pump is a device that extracts air from a closed space and discharges it to the outside. Miniature diaphragm vacuum pumps have advantages such as simple structure, small size, and low energy consumption. As a functional component, they are widely used in medical devices, smart cleaning appliances, and other products. Currently, the market demand for vacuum pumps continues to rise, as they are an indispensable functional component. Existing miniature vacuum pumps mainly have the following problems: the large space required for the pump makes it difficult to meet the overall design layout; the smaller size of the pump results in low flow rates or unstable performance, failing to meet usage requirements; and the space constraints lead to short gas channels within the pump, resulting in high noise levels and a poor user experience even at high flow rates. Additionally, there are issues with complex assembly processes and insufficient quality stability. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a miniature diaphragm vacuum pump.

[0004] The technical solution adopted by this utility model is as follows: A miniature diaphragm vacuum pump, comprising:

[0005] A pump body assembly includes a pump housing and a top cover, wherein the pump housing is provided with an air intake port and the top cover is provided with an exhaust port;

[0006] A pressurizing and sealing assembly includes a one-way base, which is disposed between a pump housing and a top cover. The chamber between the top cover and the one-way base is separated by a spacer ring structure to form an air inlet chamber and an air outlet chamber.

[0007] A piston assembly is disposed between a one-way base and a pump housing, such that the chamber between the pump housing and the one-way base is separated by the piston assembly to form an outer piston cavity and at least one inner piston cavity.

[0008] The drive assembly, in conjunction with the piston assembly, creates an alternating expansion and contraction of the piston's internal cavity.

[0009] The suction port is connected to the outer cavity of the piston, and the exhaust port is connected to the exhaust cavity. The outer cavity of the piston and the intake cavity are connected through the intake channel. The one-way base is provided with a one-way intake hole that connects the intake cavity and the inner cavity of the piston and cooperates with the intake one-way valve, and a one-way exhaust hole that connects the inner cavity of the piston and the exhaust cavity and cooperates with the exhaust one-way valve. The intake one-way valve forms a one-way control function for the flow from the intake cavity to the inner cavity of the piston, and the exhaust one-way valve forms a one-way control function for the flow from the inner cavity of the piston to the exhaust cavity.

[0010] An integrally formed sealing gasket of elastic material is provided between the top cover and the one-way base. The sealing gasket includes an outer circumferential sealing ring and an inner circumferential sealing ring connected as one piece. The outer circumferential sealing ring forms an isolation and sealing function between the chamber between the top cover and the one-way base and the outside of the pump body assembly. The inner circumferential sealing ring cooperates with the spacer ring structure to form an isolation and sealing function between the air inlet chamber and the air outlet chamber.

[0011] The partition ring structure includes an upper partition ring formed by a protrusion in the upper cover and a lower partition ring formed by a corresponding protrusion on the one-way base. An air inlet chamber is formed outside the partition ring structure and a one-way air inlet is located outside the lower partition ring. An air outlet chamber is formed inside the partition ring structure and a one-way air outlet is located inside the lower partition ring. The inner circumferential sealing ring is located between the upper partition ring and the lower partition ring.

[0012] The inner circumferential sealing ring is provided with a connecting ring. The connecting ring is provided with a first through hole corresponding to the position of the exhaust port. A second through hole corresponding to the number of piston cavities is formed between the connecting ring and the inner circumferential sealing ring. The exhaust one-way valve is a flat movable valve plate. The exhaust one-way valve is set in the second through hole and one side is connected to the outer circumferential wall of the connecting ring. The exhaust one-way valve fits against the surface of the one-way base to form a one-way control function.

[0013] The one-way base has a boss in the lower partition ring on the end face near the upper cover, which corresponds to the number of piston cavities. The one-way air outlet is located at the boss, and an air passage is formed between the bosses. The upper cover has an abutting protrusion in the upper partition ring on the end face near the one-way base. The abutting protrusion corresponds to the boss, and a connecting ring is located between the abutting protrusion and the boss.

[0014] The outer and inner circumferential sealing rings protrude at their ends near the top cover to form a first abutting protrusion ring, and the one-way base protrudes at its end near the top cover to form a second abutting protrusion ring corresponding to the outer and inner circumferential sealing rings.

[0015] The piston assembly includes a piston and a piston support. The piston includes a fixed plate and at least one bladder connected below the fixed plate. The piston support has a corresponding number of bladder perforations. The one-way base, fixed plate, piston support, and pump housing are sequentially fixedly connected. The bladders are inserted into the corresponding bladder perforations of the piston support, and each bladder forms a piston cavity. The air intake channel includes a first air intake hole on the piston support, a second air intake hole on the fixed plate of the piston, and a third air intake hole on the one-way base.

[0016] The pump housing, piston bracket, one-way base, and top cover are connected in sequence and fastened together with threaded fasteners.

[0017] The piston is integrally formed from an elastic material, and the upper surface of the fixed plate near the one-way base is formed on the outer periphery of the bladder and the outer periphery of the second air inlet hole, forming a third abutting protrusion ring.

[0018] The bladder has several parts arranged in a ring. The piston assembly includes a turntable and a swing shaft. The turntable is fixedly connected to the end of the bladder. The drive assembly includes a rotary drive mechanism and an eccentric wheel. The rotary drive mechanism drives the eccentric wheel to rotate. The two ends of the swing shaft are respectively connected to the center hole of the turntable and the inclined hole of the eccentric wheel that is eccentric to the center of rotation.

[0019] This invention improves the structure of the miniature diaphragm vacuum pump, creating a gas channel inside the pump that is sequentially connected by an air intake port, a piston outer cavity below the one-way base, an air intake cavity above the one-way base, a piston inner cavity below the one-way base, an air outlet cavity above the one-way base, and an exhaust port, effectively reducing noise. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.

[0021] Figure 1 This is a schematic diagram of the structure of one embodiment of the present utility model;

[0022] Figure 2 This is a cross-sectional view of one embodiment of the present utility model;

[0023] Figure 3 This is an exploded view of one embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the structure of a sealing gasket according to an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the structure of the cover in one embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the structure of a unidirectional base according to an embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of the piston structure according to one embodiment of the present invention;

[0028] Figure 8 This is a schematic diagram of the piston support structure according to one embodiment of the present invention;

[0029] Figure 9 This is a schematic diagram of a gas flow channel according to an embodiment of the present invention;

[0030] In the diagram, the components are: self-tapping screw-1, top cover-2, exhaust port-201, upper spacer ring-202, abutting convex ring-203, sealing gasket-3, one-way valve-301, outer circumferential sealing ring-302, inner circumferential sealing ring-303, connecting ring-304, first through hole-305, second through hole-306, first abutting convex ring-307, one-way base-4, one-way air inlet-401, one-way air outlet-402, lower spacer ring-403, boss-404, air passage-405, and second abutting convex ring. 406, third air inlet hole - 407, one-way valve - 5, piston - 6, fixed plate - 601, bladder - 602, pull foot - 603, second air inlet hole - 604, third abutting convex ring - 605, piston bracket - 7, bladder perforation - 701, first air inlet hole - 702, turntable - 8, swing shaft - 9, second O-ring - 10, eccentric wheel - 11, machine thread screw - 12, pump housing - 13, air extraction port - 1301, first O-ring - 14, rotary drive mechanism - 15;

[0031] Piston outer cavity - A, intake cavity - B, piston inner cavity - C, exhaust cavity - D. Detailed Implementation

[0032] To make the objectives, technical solutions and advantages of this utility model clearer, the utility model will be described in further detail below with reference to the accompanying drawings.

[0033] It should be noted that all uses of "first" and "second" in the embodiments of this utility model are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first" and "second" are only for the convenience of expression and should not be construed as limiting the embodiments of this utility model. Subsequent embodiments will not explain this in detail.

[0034] The directional and positional terms used in this utility model, such as up, down, front, back, left, right, inside, outside, top, bottom, side, etc., are only for reference to the accompanying drawings. Therefore, the directional and positional terms used are for the purpose of explaining and understanding this utility model, and not for limiting the scope of protection of this utility model.

[0035] A miniature diaphragm vacuum pump, such as Figures 1-3 As shown, it includes a pump body assembly, a pressurizing seal assembly, a piston assembly, and a drive assembly.

[0036] like Figure 1 , Figure 2 As shown, the pump body assembly includes a pump housing 13 and an upper cover 2; the pressurization and sealing assembly includes a one-way base 4, an outlet one-way valve 301, and an inlet one-way valve 5; the piston assembly includes a piston 6, a piston support 7, a turntable 8, and a swing shaft 9; and the drive assembly includes a rotary drive mechanism 15 and an eccentric wheel 11.

[0037] Pump housing 13, piston bracket 7, one-way base 4, and upper cover 2 are sequentially connected and fastened together by self-tapping screws 1. Pump housing 13 has an air intake port 1301, and upper cover 2 has an exhaust port 201. The chamber between upper cover 2 and one-way base 4 is separated by a spacer ring structure to form an intake chamber B and an exhaust chamber D. The chamber between pump housing 13 and one-way base 4 is separated by a piston assembly to form an outer piston chamber A and at least one inner piston chamber C. The air intake port is connected to the outer piston chamber A, and the exhaust port 201 is connected to the exhaust chamber D. Cavity B is kept connected through an air intake channel. The one-way base 4 is provided with a one-way air intake port 401 connecting the air intake chamber B and the piston inner cavity C, and cooperating with the one-way air intake valve 5; and a one-way air outlet port 402 connecting the piston inner cavity C and the air outlet chamber D, and cooperating with the one-way air outlet valve 301. The one-way air intake valve 5 provides one-way control for airflow from the air intake chamber B to the piston inner cavity C, and the one-way air outlet valve 301 provides one-way control for airflow from the piston inner cavity C to the air outlet chamber D. The drive assembly cooperates with the piston assembly to alternately expand and contract the volume of the piston inner cavity C. Figure 9 As shown, when the piston inner cavity C expands, a negative pressure is formed inside the piston inner cavity C. The inlet one-way valve 5 opens and the outlet one-way valve 301 closes. Gas is drawn into the piston inner cavity C through the suction port, the piston outer cavity A, the intake channel, the intake chamber B, and the one-way intake hole 401. At this time, the piston inner cavity C is then reduced, the gas pressure inside the piston inner cavity C increases, the inlet one-way valve 5 closes, and the outlet one-way valve 301 opens. The gas inside the piston inner cavity C is discharged through the one-way outlet hole 402, the outlet chamber D, and the exhaust port 201. The repeated suction / exhaust creates the function of a vacuum pump.

[0038] Specifically, a one-piece molded elastic sealing gasket 3 is provided between the top cover 2 and the one-way base 4, such as... Figure 4 As shown, the sealing gasket 3 includes an outer peripheral sealing ring 302 and an inner peripheral sealing ring 303 connected as one piece. The outer peripheral sealing ring 302 forms an isolation and sealing function between the chamber between the upper cover 2 and the one-way base 4 and the outside of the pump body assembly. The inner peripheral sealing ring 303 cooperates with the spacer ring structure to form an isolation and sealing function between the air inlet chamber B and the air outlet chamber D.

[0039] Furthermore, such as Figure 5 , Figure 6 As shown, the partition ring structure includes an upper partition ring 202 protruding in the upper cover 2 and a lower partition ring 403 protruding at a corresponding position on the one-way base 4. An air inlet chamber B is formed outside the partition ring structure, and a one-way air inlet hole 401 is provided outside the lower partition ring 403. An air outlet chamber D is formed inside the partition ring structure, and a one-way air outlet hole 402 is provided inside the lower partition ring 403. The inner circumferential sealing ring 303 is located between the upper partition ring 202 and the lower partition ring 403.

[0040] Furthermore, such as Figure 3 As shown, the exhaust one-way valve 301 is located inside the inner circumferential sealing ring 303 and is integrally connected to the inner circumferential sealing ring 303. A connecting ring 304 is provided inside the inner circumferential sealing ring 303. The connecting ring 304 has a first through hole 305 corresponding to the position of the exhaust port 201. A second through hole 306 corresponding to the number of piston cavities C is formed between the connecting ring 304 and the inner circumferential sealing ring 303. The exhaust one-way valve 301 is a flat movable valve plate. The exhaust one-way valve 301 is disposed within the second through hole 306 and one side is connected to the outer circumferential wall of the connecting ring 304. The exhaust one-way valve 301 conforms to the surface of the one-way base 4 to form a one-way control function.

[0041] The intake one-way valve 5 adopts an umbrella-shaped valve plate structure connected to the side of the one-way base 4 away from the upper cover 2.

[0042] Furthermore, such as Figure 6 As shown, the end face of the one-way base 4 near the upper cover 2 has a boss 404 formed within the lower spacer ring 403, corresponding to the number of piston cavities C. The one-way air outlet 402 is located at the boss 404, and an air passage 405 is formed between the bosses 404. Figure 5 As shown, an abutting protrusion 203 is formed on the end face of the upper cover 2 near the one-way base 4 within the upper partition ring 202. The abutting protrusion 203 corresponds to the boss 404, and the connecting ring 304 is disposed between the abutting protrusion 203 and the boss 404. This forms a shield for the gas discharged upward from the one-way vent 402, preventing the gas from being discharged directly through the exhaust port 201 when it is discharged upward from the one-way vent 402. Instead, the gas bypasses the abutting protrusion 203 and the connecting ring 304 and is discharged through the air passage 405, thus achieving S-shaped gas flow to the outside of the exhaust port.

[0043] Furthermore, such as Figure 4 As shown, the outer circumferential sealing ring 302 and the inner circumferential sealing ring 303 protrude from the end faces near the upper cover 2 to form a first abutting protrusion ring 307, as... Figure 6 As shown, the end face of the one-way base 4 near the upper cover 2 corresponds to the outer peripheral sealing ring 302 and the inner peripheral sealing ring 303 protruding to form a second abutting protrusion ring 406, which improves the sealing effect of the sealing gasket 3 between the upper cover 2 and the one-way base 4.

[0044] The structures of piston 6 and piston support 7 are as follows: Figure 7 , Figure 8As shown, the piston 6 includes a fixed plate 601 and three bladders 602 arranged in a ring below the fixed plate 601. The lower end of each bladder 602 is fixedly connected to a pull foot 603. The fixed plate 601 has an opening corresponding to the bladder 602. The piston support 7 has a corresponding number of bladder perforations 701. The fixed plate 601 is fixed between the one-way base 4 and the piston support 7, and the three bladders 602 of the piston 6 are inserted into the corresponding bladder perforations 701 of the piston support 7. The pull foot 603 is fixed on the turntable 8. The rotary drive mechanism 15 drives the eccentric wheel 11 to rotate. The two ends of the swing shaft 9 are respectively connected to the center hole of the turntable 8 and the inclined hole of the eccentric wheel 11 that is eccentric to the rotation axis. This forms the rotary drive mechanism 15, which transmits the rotation drive to the turntable 8 to swing, alternately pulling / releasing the three bladders 602, thereby realizing the alternating expansion / contraction of the piston cavity C.

[0045] The air intake channel includes a first air intake hole 702 disposed on the piston support 7, a second air intake hole 604 disposed on the fixed plate 601 of the piston 6, and a third air intake hole 407 disposed on the one-way base 4, wherein the first air intake hole 702, the second air intake hole 604 and the third air intake hole 407 are connected in sequence.

[0046] Furthermore, the piston 6 is integrally molded from an elastic material, such as... Figure 7 As shown, the upper surface of the fixed plate 601 near the one-way base 4 is formed on the outer periphery of the bladder 602 and the outer periphery of the second air inlet hole 604, and a third abutting protrusion 605 is formed thereon.

[0047] The rotary drive mechanism 15 is a motor, which is threadedly fixed to the outer end of the base 13 by a machine screw 12. The drive shaft of the motor extends into the base 13, and the outer circumference of the drive shaft is sealed to the base 13 by a first O-ring 14. The base 13 is sealed to the piston bracket 7 by a second O-ring 10. The piston bracket 7 is sealed to the one-way base 4 by a piston 6. The one-way base 4 is sealed to the top cover 2 by a sealing gasket 3. The overall structure is reliably sealed, simple to assemble, and has a wide flow coverage range. In addition, it can reduce the speed of the drive motor, effectively reduce vibration and noise, and achieve low-noise and stable operation.

[0048] In this embodiment, the sealing gasket 3 integrates the sealing and isolation function between the inlet and outlet air chambers and the sealing function of the outlet one-way valve, achieving multiple functions and avoiding the unstable factors such as equipment and process caused by ultrasonic welding, thus reducing the risk points in the product manufacturing process.

[0049] The above-disclosed embodiments 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 still fall within the scope of the present utility model.

Claims

1. A miniature diaphragm vacuum pump, characterized in that, include: The pump body assembly includes a pump housing (13) and a top cover (2), wherein the pump housing (13) is provided with an air intake port (1301) and the top cover (2) is provided with an exhaust port (201); The pressurized sealing assembly includes a one-way base (4), which is disposed between the pump housing (13) and the upper cover (2). The chamber between the upper cover (2) and the one-way base (4) is separated by a partition ring structure to form an air inlet chamber (B) and an air outlet chamber (D). A piston assembly is disposed between a one-way base (4) and a pump housing (13), such that the chamber between the pump housing (13) and the one-way base (4) is separated by the piston assembly to form an outer piston chamber (A) and at least one inner piston chamber (C); The drive assembly, in conjunction with the piston assembly, forms an alternating expansion and contraction of the piston's internal cavity (C); The suction port (1301) is connected to the outer cavity (A) of the piston, and the exhaust port (201) is connected to the exhaust cavity (D). The outer cavity (A) of the piston and the intake cavity (B) are connected through the intake channel. The one-way base (4) is provided with a one-way intake hole (401) that connects the intake cavity (B) and the inner cavity (C) of the piston and cooperates with the intake one-way valve (5), and a one-way exhaust hole (402) that connects the inner cavity (C) of the piston and the exhaust cavity (D) and cooperates with the exhaust one-way valve (301). The intake one-way valve (5) forms a one-way control function for the flow from the intake cavity (B) to the inner cavity (C) of the piston, and the exhaust one-way valve (301) forms a one-way control function for the flow from the inner cavity (C) of the piston to the exhaust cavity (D).

2. The miniature diaphragm vacuum pump according to claim 1, characterized in that: A sealing gasket (3) made of elastic material is provided between the upper cover (2) and the one-way base (4). The sealing gasket (3) includes an outer peripheral sealing ring (302) and an inner peripheral sealing ring (303) connected as one piece. The outer peripheral sealing ring (302) forms an isolation and sealing function between the chamber between the upper cover (2) and the one-way base (4) and the outside of the pump body assembly. The inner peripheral sealing ring (303) cooperates with the spacer structure to form an isolation and sealing function between the air inlet chamber (B) and the air outlet chamber (D).

3. The miniature diaphragm vacuum pump according to claim 2, characterized in that: The partition ring structure includes an upper partition ring (202) protruding in the upper cover (2) and a lower partition ring (403) protruding at a corresponding position on the one-way base (4). An air inlet chamber (B) is formed outside the partition ring structure and a one-way air inlet hole (401) is located outside the lower partition ring (403). An air outlet chamber (D) is formed inside the partition ring structure and a one-way air outlet hole (402) is located inside the lower partition ring (403). The inner circumferential sealing ring (303) is located between the upper partition ring (202) and the lower partition ring (403).

4. The miniature diaphragm vacuum pump according to claim 3, characterized in that: The inner circumferential sealing ring (303) is provided with a connecting ring (304) on its inner side. The connecting ring (304) is provided with a first through hole (305) corresponding to the position of the exhaust port (201). A second through hole (306) corresponding to the number of piston cavities (C) is formed between the connecting ring (304) and the inner circumferential sealing ring (303). The exhaust one-way valve (301) is a flat movable valve plate. The exhaust one-way valve (301) is set in the second through hole (306) and one side is connected to the outer circumferential wall of the connecting ring (304). The exhaust one-way valve (301) fits against the surface of the one-way base (4) to form a one-way control function.

5. The miniature diaphragm vacuum pump according to claim 4, characterized in that: The one-way base (4) has a boss (404) in the lower partition ring (403) on the end face near the upper cover (2) that corresponds to the number of piston cavities (C). The one-way air outlet (402) is located at the boss (404). An air passage (405) is formed between the bosses (404). The upper cover (2) has an abutting ring (203) in the upper partition ring (202) on the end face near the one-way base (4). The abutting ring (203) corresponds to the boss (404) and a connecting ring (304) is located between the abutting ring (203) and the boss (404).

6. The miniature diaphragm vacuum pump according to claim 2, characterized in that: The outer circumferential sealing ring (302) and the inner circumferential sealing ring (303) protrude near the end face of the upper cover (2) to form a first abutting protrusion ring (307), and the one-way base (4) protrudes near the end face of the upper cover (2) to form a second abutting protrusion ring (406) corresponding to the outer circumferential sealing ring (302) and the inner circumferential sealing ring (303).

7. The miniature diaphragm vacuum pump according to any one of claims 1-6, characterized in that: The piston assembly includes a piston (6) and a piston support (7). The piston (6) includes a fixed plate (601) and at least one bladder (602) connected below the fixed plate (601). The piston support (7) is provided with a corresponding number of bladder perforations (701). The one-way base (4), fixed plate (601), piston support (7), and pump housing (13) are sequentially fixedly connected. The bladder (602) is inserted into the corresponding bladder perforation (701) of the piston support (7). Each bladder (602) forms a piston cavity (C). The air intake channel includes a first air intake hole (702) provided on the piston support (7), a second air intake hole (604) provided on the fixed plate (601) of the piston (6), and a third air intake hole (407) provided on the one-way base (4).

8. The miniature diaphragm vacuum pump according to claim 7, characterized in that: The pump housing (13), piston bracket (7), one-way base (4), and upper cover (2) are connected in sequence and fastened by threaded fasteners.

9. The miniature diaphragm vacuum pump according to claim 8, characterized in that: The piston (6) is integrally formed of elastic material. The upper surface of the fixed plate (601) near the one-way base (4) is formed on the outer periphery of the bladder (602) and the outer periphery of the second air inlet (604) and a third abutting protrusion (605) is formed.

10. The miniature diaphragm vacuum pump according to claim 7, characterized in that: The bladder (602) has several parts arranged in a ring. The piston assembly includes a turntable (8) and a swing shaft (9). The turntable (8) is fixedly connected to the end of the bladder (602). The drive assembly includes a rotary drive mechanism (15) and an eccentric wheel (11). The rotary drive mechanism (15) drives the eccentric wheel (11) to rotate. The two ends of the swing shaft (9) are respectively connected to the central hole of the turntable (8) and the inclined hole of the eccentric wheel (11) that is eccentric to the rotation axis.

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