A water vapor resistant diaphragm vacuum pump

Abstract

The utility model relates to micro diaphragm pump technical field especially relates to a kind of water vapor resistant diaphragm vacuum pump, comprising: piston assembly;Motor, it has motor drive shaft;Motor fixing base, it is connected between piston assembly and motor, motor drive shaft is worn in motor fixing base and is transmission connection with piston assembly;And second sealing pad, second sealing pad is set between motor fixing base and motor, and is set in the outer periphery of motor drive shaft.This application is set in the outer periphery of motor drive shaft by setting second sealing pad and is located between motor fixing base and motor, effectively prevent water vapor in working environment from penetrating into motor interior, avoid motor water, bearing rust corrosion and fault occurrence, to improve the water vapor resistance of vacuum pump and service life;Meanwhile, the sealing structure enhances overall sealing reliability, reduces maintenance requirement, applicable to humid environment such as sweeper and other equipment, improve the stability and durability of product.

Description

Technical Field

[0001] This utility model relates to the field of micro diaphragm pump technology, and in particular to a water vapor resistant diaphragm vacuum pump. Background Technology

[0002] Vacuum pumps, as devices capable of extracting air from a closed space and discharging it to the outside, are widely used in medical devices, smart cleaning appliances, and other products. In particular, miniature diaphragm vacuum pumps, such as the miniature diaphragm air pump disclosed in the applicant's prior patent CN202321873508.3, have seen a continuous increase in market demand due to their simple structure, small size, and low energy consumption. However, existing miniature vacuum pumps face a significant technical problem in practical applications. For example, in devices such as sweepers, although the vacuum pump does not directly contact or wade through water, its working environment is often accompanied by moisture. This moisture can penetrate into the motor during long-term operation, leading to water ingress, bearing rust and corrosion, and ultimately motor failure, causing the entire vacuum pump to fail. This failure not only shortens the lifespan of the vacuum pump but also increases maintenance costs, seriously affecting product reliability and user experience. Therefore, how to effectively prevent moisture from entering the motor and improve the vacuum pump's moisture resistance and lifespan is a key issue that urgently needs to be addressed in the current vacuum pump technology field. Existing technologies urgently need improvement to address these issues. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this application provides a water vapor resistant diaphragm vacuum pump.

[0004] To achieve the above objectives, the technical solution of this application is as follows: A water vapor resistant diaphragm vacuum pump includes: a piston assembly; a motor having a motor drive shaft; a motor mounting base connected between the piston assembly and the motor, the motor drive shaft passing through the motor mounting base and being drively connected to the piston assembly; and a second sealing gasket disposed between the motor mounting base and the motor, and sleeved on the outer periphery of the motor drive shaft.

[0005] Furthermore, the second sealing gasket includes a second inner sealing ring; the inner peripheral wall of the second inner sealing ring is formed with an upper sealing lip and a lower sealing lip that seal with the outer peripheral wall of the motor drive shaft, and the upper sealing lip and the lower sealing lip are spaced apart by a certain distance.

[0006] Furthermore, the upper sealing lip is a disc-shaped sealing lip with an inclination of α where the inner circumference is higher than the outer circumference, and the lower sealing lip is a horizontally arranged annular sealing lip.

[0007] Furthermore, the inner circumference of the lower sealing lip is a conical surface with an inner higher surface and an outer lower surface, and a slope of β.

[0008] Furthermore, the inner circumference of the upper sealing lip is a conical surface with an inner higher surface and an outer lower surface, and a slope of γ.

[0009] Furthermore, the second sealing gasket includes a second outer sealing ring, the outer peripheral wall of which is formed with an upper sealing protrusion and a lower sealing protrusion. The upper sealing protrusion has a convex curved surface that seals with the motor mounting base, and the lower sealing protrusion has a convex curved surface that seals with the outer wall of the motor.

[0010] Furthermore, the motor mounting base is provided with a sealing groove that matches the second sealing gasket, the upper sealing convex ring is deformed by compression and disposed between the second sealing gasket and the motor mounting base, and the lower sealing convex ring is deformed by compression and disposed between the second sealing gasket and the outer wall of the motor.

[0011] Furthermore, the piston assembly includes a piston, a piston support, a turntable, a turntable drive shaft, and an eccentric wheel; the piston support is connected to a motor mounting base, the piston has multiple bladders, and the piston support has bladder mounting holes corresponding to the multiple bladders one by one. The bladders are installed in the bladder mounting holes and divide the chamber formed by connecting the piston support and the motor mounting base into a first air intake chamber located outside the piston and a piston chamber located inside the piston. The motor mounting base has an air inlet connected to the first air intake chamber; the turntable, the turntable drive shaft, and the eccentric wheel are sequentially connected and disposed in the first air intake chamber, and the eccentric wheel is sleeved on the motor drive shaft; the turntable is connected to the multiple bladders.

[0012] Furthermore, it also includes an O-ring seal; the O-ring seal is disposed between the piston bracket and the motor mounting base.

[0013] Furthermore, it also includes a pressurization chamber, a first sealing gasket, a one-way base, and an intake one-way valve; the pressurization chamber, the one-way base, and the piston bracket are connected in sequence; a second intake chamber and an exhaust chamber are formed between the pressurization chamber and the one-way base, and a first channel connecting the first intake chamber and the second intake chamber, a second channel connecting the second intake chamber and the piston chamber, and a third channel connecting the piston chamber and the exhaust chamber are provided; the first sealing gasket is fixed between the pressurization chamber and the one-way base, and an exhaust one-way valve is integrated on it; the exhaust one-way valve acts on the third channel to form one-way airflow control from the piston chamber to the exhaust chamber; the intake one-way valve is connected to the one-way base, and it acts on the second channel to form one-way airflow control from the second intake chamber to the piston chamber.

[0014] The beneficial effects of this application are: by setting a second sealing gasket around the outer periphery of the motor drive shaft and located between the motor mounting base and the motor, it effectively prevents moisture in the working environment from penetrating into the motor, avoiding water ingress into the motor, bearing rust and corrosion, and malfunctions, thereby improving the vacuum pump's resistance to moisture and its service life; at the same time, this sealing structure enhances the overall sealing reliability, reduces maintenance requirements, is suitable for humid environments such as sweepers and other equipment, and improves the product's stability and durability. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of the present invention.

[0016] Figure 1 This is a schematic diagram of the structure of a water vapor resistant diaphragm vacuum pump provided in one embodiment of this application; Figure 2 An exploded view of a water vapor resistant diaphragm vacuum pump provided in one embodiment of this application; Figure 3 This is an exploded view of a live pressure sealing assembly and a one-way base assembly provided in one embodiment of this application; Figure 4 This is a cross-sectional view of a water vapor resistant diaphragm vacuum pump provided in one embodiment of this application, illustrating the fluid flow process. Figure 5 This is a schematic diagram of the mating structure of a motor, a motor mounting base, and a second sealing gasket provided in one embodiment of this application; Figure 6 This is a schematic diagram of the structure of the second sealing gasket provided in one embodiment of this application; Figure 7 A cross-sectional view of a second sealing gasket provided in one embodiment of this application; Figure 8 This is a schematic diagram of the structure of a motor mounting bracket provided in one embodiment of this application; Figure 9 for Figure 5 The enlarged schematic diagram of part I shows the sealing fit structure formed by the second sealing gasket.

[0017] In the diagram: 1. Self-tapping screw; 2. Pressure chamber; 201. Air outlet; 3. First sealing gasket; 301. Air outlet check valve; 302. First outer sealing ring; 303. First inner sealing ring; 4. One-way base; 401. Third air inlet; 402. Fourth air inlet; 403. Air outlet; 5. Air inlet check valve; 6. Piston; 601. Second air inlet; 602. Bladder body; 7. Piston bracket; 701. First air inlet; 702. Bladder body mounting hole. 8. Turntable; 9. Turntable drive shaft; 10. Eccentric wheel; 11. O-ring seal; 12. Machine thread screw; 13. Motor mounting bracket; 1301. Air inlet; 1302. Sealing groove; 14. Second sealing gasket; 1401. Second outer sealing ring; 1402. Second inner sealing ring; 1403. Lower sealing convex ring; 1404. Upper sealing convex ring; 1405. Lower sealing lip; 1406. Upper sealing lip; 15. Motor; 1501. Motor drive shaft; A. First intake chamber; B. Second intake chamber; C. Piston chamber; D. Exhaust chamber. Detailed Implementation

[0018] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application. The terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0020] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0021] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0023] In this application, "and / or" is merely a way of describing the relationship between related objects, indicating that three relationships can exist; for example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0024] It should be noted that in this application, the words "in some embodiments," "exemplarily," and "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this application as "in some embodiments," "exemplarily," or "for example" should not be construed as being more preferred or advantageous than other embodiments or design solutions. Specifically, the use of words such as "in some embodiments," "exemplarily," and "for example" is intended to present related concepts in a specific manner, meaning that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of this application. The appearance of the above words in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0025] Vacuum pumps, as devices capable of extracting air from a closed space and discharging it to the outside, are widely used in medical devices, smart cleaning appliances, and other products. In particular, miniature diaphragm vacuum pumps, such as the miniature diaphragm air pump disclosed in the applicant's prior patent CN202321873508.3, have seen a continuous increase in market demand due to their simple structure, small size, and low energy consumption. However, existing miniature vacuum pumps face a significant technical problem in practical applications. For example, in devices such as sweepers, although the vacuum pump does not directly contact or wade through water, its working environment is often accompanied by moisture. This moisture can penetrate into the motor during long-term operation, leading to water ingress, bearing rust and corrosion, and ultimately motor failure, causing the entire vacuum pump to fail. This failure not only shortens the lifespan of the vacuum pump but also increases maintenance costs, seriously affecting product reliability and user experience. Therefore, how to effectively prevent moisture from entering the motor and improve the vacuum pump's moisture resistance and lifespan is a key issue that urgently needs to be addressed in the current vacuum pump technology field. Existing technologies urgently need improvement to address these issues. This application provides a water vapor resistant diaphragm vacuum pump, such as... Figure 1 , Figure 2 As shown: including pressurization chamber 2, first sealing gasket 3, one-way base 4 and intake one-way valve 5, piston 6, piston bracket 7, turntable 8, turntable drive shaft 9, eccentric wheel 10, motor mounting base 13, motor 15.

[0026] The piston assembly consists of piston 6, piston support 7, turntable 8, turntable drive shaft 9, and eccentric wheel 10. Specifically, piston support 7 is connected to motor mounting base 13. Piston 6 is provided with multiple flexible bladders 602. Piston support 7 has corresponding bladder mounting holes 702. Bladders 602 are installed in the holes. The partition chamber is a first air intake chamber A and a piston chamber C. Motor mounting base 13 is provided with an air inlet 1301 that connects to the first air intake chamber A. Pressurization chamber 2, one-way base 4, and piston support 7 are connected in sequence to form a second air intake chamber B and an air outlet chamber D. Pressurization chamber 2 is provided with an air outlet 201 that connects to the air outlet chamber D. It is also provided with a first channel connecting the first air intake chamber A and the second air intake chamber B, a second channel connecting the second air intake chamber B and the piston chamber C, and a third channel connecting the piston chamber C and the air outlet chamber D. Turntable 8, turntable drive shaft 9, and eccentric wheel 10 are connected in sequence. Turntable 8 is fixedly connected to multiple flexible bladders 602. The center hole of eccentric wheel 10 is inserted into the motor drive shaft 1501 of motor 15, serving as a functional transmission element for driving the rotation of motor 15 and playing a role in kinetic energy transmission, driving multiple flexible bladders 602 to alternately stretch / compress in sequence. The first sealing gasket 3 is fixed between the pressurization chamber 2 and the one-way base 4. The integrated exhaust one-way valve 301 acts on the third channel to realize one-way airflow from piston chamber C to exhaust chamber D. The intake one-way valve 5 is connected to the one-way base 4 and acts on the second channel to realize one-way airflow from the second intake chamber B to piston chamber C.

[0027] The main problem with the existing technology described above is that gas enters the air intake chamber A through the gap between the motor 15 and the motor drive shaft 1501. The moisture carried by this gas seeps through the gap between the motor drive shaft 1501 and the motor mounting base 13, eventually corroding the internal components of the motor 15. Over time, the performance of the motor 15 will be significantly reduced, or it may even stop working completely, preventing the robot vacuum from completing its cleaning tasks properly.

[0028] To address the problems existing in the prior art, this application embodiment includes a second sealing gasket 14, such as... Figure 5 As shown, the second sealing gasket 14 is disposed between the motor mounting base 13 and the motor 15, and is sleeved on the outer periphery of the motor drive shaft 1501 to seal the gap between the motor housing 15 and the motor drive shaft 1501, which significantly improves the water vapor resistance and service life of the vacuum pump.

[0029] Alternatively, in some embodiments, such as Figure 6 , Figure 7 As shown, the second sealing gasket 14 includes a second inner sealing ring 1402. The inner peripheral wall of the second inner sealing ring 1402 has an upper sealing lip 1406 and a lower sealing lip 1405 that seal against the outer peripheral wall of the motor drive shaft 1501. The upper sealing lip 1406 and the lower sealing lip 1405 are spaced apart by a certain distance. In specific implementation, the inner peripheral edges of the upper sealing lip 1406 and the lower sealing lip 1405 slide in contact with the motor drive shaft 1501, forming a dynamic seal when the shaft rotates. This creates two independent sealing lines, distributing the sealing load, reducing single-point wear, improving the dynamic sealing effect on the motor drive shaft 1501, and effectively preventing moisture from seeping in along the shaft. By setting a double sealing structure with the upper sealing lip 1406 and the lower sealing lip 1405, even if one sealing lip fails, the other sealing lip can still function, thus ensuring the reliability of the seal. In addition, the gap between the two sealing lips can form a buffer zone to collect small amounts of leakage, further reducing the risk of leakage.

[0030] Optionally, in some embodiments, the upper sealing lip 1406 is a disc-shaped sealing plate with an inner circumference higher than the outer circumference at an angle of α, and the lower sealing lip 1405 is a horizontally arranged annular sealing plate. For example... Figure 7 As shown, α is the angle of inclination relative to the radial direction. In a specific implementation, the slope α of the upper sealing lip 1406 is 5° to 15°, forming a disc shape; the lower sealing lip 1405 is a straight annular piece, providing basic seal support. The disc-shaped structure generates centrifugal force when the shaft rotates, dispersing water vapor to optimize hydrodynamics. The above structure enhances self-cleaning capability and reduces water vapor accumulation through the slope design of the upper sealing lip 1406, while the straight structure of the lower sealing lip 1405 ensures static seal reliability. Optionally, in some embodiments, the inner periphery of the lower sealing lip 1405 is a conical surface with an inner higher surface and an outer lower surface, and a slope of β. For example... Figure 7 As shown, β is the angle of inclination relative to the radial direction. In specific implementation, the inclination β is 70° to 80°, and the conical surface is inclined towards the motor 15. The side of the conical surface near the intake chamber A forms a tight seal with the outer peripheral wall of the motor drive shaft 1501, and the gap between the side away from the intake chamber A and the outer peripheral wall of the motor drive shaft 1501 can compensate for the small vibrations and deviations of the motor drive shaft 1501.

[0031] Optionally, in some embodiments, the inner periphery of the upper sealing lip 1406 is a conical surface with an inner higher surface and an outer lower surface, and a slope of γ. For example... Figure 7 As shown, γ is tilted at an angle relative to the radial direction. In specific implementations, the tilt angle γ is 70° to 80°. Similarly, the conical surface elastically deforms to compensate for the clearance when the axis is eccentric.

[0032] Alternatively, in some embodiments, such as Figure 6 As shown in Figures 7 and 8, the second sealing gasket 14 includes a second outer sealing ring 1401. The outer peripheral wall of the second outer sealing ring 1401 has an upper sealing protrusion 1404 and a lower sealing protrusion 1403. The upper sealing protrusion 1404 has a convex curved surface that seals with the motor mounting base 13, and the lower sealing protrusion 1403 has a convex curved surface that seals with the outer wall of the motor 15. In a specific implementation, the second outer sealing ring 1401 is an annular structure integrally formed on the outer periphery of the second inner sealing ring 1402, used to form a seal between the air intake chamber A and the outside world, preventing gas in the air intake chamber A from leaking through the gap between the motor 15 and the motor mounting base 13. At the same time, the second sealing gasket 14 is effectively fixed by the motor 15 and the motor mounting base 13. The convex surfaces of the upper sealing ring 1404 and the lower sealing ring 1403 are designed in an arc shape. During assembly, the motor 15 and the motor mounting base 13 are connected and fixed by machine thread screws 12, so that the corresponding surfaces of the upper sealing ring 1404 and the motor mounting base 13 are tightly fitted, and the lower sealing ring 1403 is compressed and deformed against the outer wall of the motor 15. The special structure of the second outer sealing ring 1401 generates uniform compressive stress, which significantly improves the integrity and durability of the sealing interface and effectively prevents moisture intrusion in high humidity environments. This not only reduces the risk of internal corrosion of the motor 15, but also reduces the maintenance frequency caused by seal failure. Optionally, in some embodiments, the motor mounting base 13 has a sealing groove 1302 adapted to the second sealing gasket 14. The upper sealing protrusion 1404 is deformed by compression and positioned between the second sealing gasket 14 and the motor mounting base 13, and the lower sealing protrusion 1403 is deformed by compression and positioned between the second sealing gasket 14 and the outer wall of the motor 15. In specific implementations, the sealing groove 1302 is an annular groove with a depth slightly less than the thickness of the second sealing gasket 14. During assembly, the second sealing gasket 14 is embedded in it, and pressure is applied by the machine screw 12 to cause the upper sealing protrusion 1404 and the lower sealing protrusion 1403 to undergo plastic deformation and fit against the surface. The sealing groove 1302 can be used for positioning the second sealing gasket 14. Specifically, in some embodiments of this application, such as Figure 3 , Figure 4As shown, the outlet one-way valve 301 is a diaphragm fixed on one side, and the inlet one-way valve 5 is an umbrella-shaped diaphragm valve. Both open and close under pressure difference to ensure unidirectional airflow. The piston support 7 has several first inlet holes 701 near its outer periphery, the piston 6 has several second inlet holes 601 corresponding to the positions of the first inlet holes 701 near its outer periphery, and the one-way base 4 has several third inlet holes 401 corresponding to the positions of the second inlet holes 601 near its outer periphery. The first inlet holes 701, second inlet holes 601, and third inlet holes 401 are sequentially connected to form a first channel connecting the first inlet chamber A and the second inlet chamber B. The one-way base 4 has a fourth inlet hole 402 corresponding to the position of the bladder 602, forming a second channel connecting the second inlet chamber B and the piston chamber C. The inlet one-way valve 5 is fixed to the one-way base 4, and its umbrella-shaped flap is located on the side of the one-way base 4 near the piston chamber C, cooperating with the fourth inlet hole 402. The one-way base 4 is provided with an air outlet hole 403 corresponding to the position of the bladder body 602, forming a third channel connecting the piston chamber C and the air outlet chamber D. The one-way air outlet valve 301 is located on one side of the air outlet chamber D of the one-way base 4 and cooperates with the air outlet hole 403. Specifically, the fourth air inlet hole 402 is close to the outer side of the bladder body 602, and the air outlet hole 403 is close to the inner side of the bladder body 602.

[0033] Optionally, it also includes an O-ring seal 11, which is disposed between the piston bracket 7 and the motor mounting base 13; the O-ring seal 11 is an annular rubber part, which is installed in the groove of the connecting surface and seals the gap after compression to prevent air or water vapor leakage.

[0034] Motor drive assembly: The second sealing gasket 14 is fitted onto the motor drive shaft 1501 of the motor 15. The motor mounting base 13, the motor 15, and the second sealing gasket 14 form an assembly and are fixed by threaded connection with the machine screw 12. The center hole of the eccentric wheel 10 is inserted into the motor drive shaft 1501 of the motor 15. The O-ring seal 10 is installed in the corresponding groove on the top of the motor mounting base 13. The eccentric wheel 10 serves as a functional transmission element for driving the rotation of the motor shaft 15 and plays a role in kinetic energy transmission. The O-ring seal performs the sealing operation between the first air inlet chamber A and the external atmospheric pressure. The second sealing gasket 14 seals and isolates the pump inner cavity from the motor 15 to prevent air leakage and water vapor from entering the surface or interior of the motor bearing. Piston assembly: The turntable drive shaft 9 is pressed into the central shaft hole of the turntable 8, and the three bladders 601 of the piston 6 are assembled and fitted into the corresponding bladder mounting holes 702 of the piston bracket 7. The turntable assembly and the piston 6 are fixedly connected by pull feet and ball joints. The three pull feet of the piston 6 are inserted into the three side holes of the turntable 8. This is the working part of the piston for gas transmission and compression. Pressurization and sealing assembly: The center pull foot of the intake one-way valve 5 passes through the center hole of the three corresponding annular holes on the periphery of the one-way base 4 until the step of the pull foot of the intake one-way valve 5 passes through the bottom plane of the one-way base 4. The first sealing gasket 3 is installed into the internal groove of the one-way base 4. The outer U-shaped notch on the first outer sealing ring 302 of the first sealing gasket 3 is installed into the corresponding inner U-shaped structure of the one-way base 4, forming the one-way base assembly. The pressurization chamber 2 is assembled and covered with the one-way base assembly, thus completing the pre-assembly of the semi-finished product. The function of the pressurization chamber 2 and the sealing one-way valve assembly is to make the piston chamber, intake chamber and exhaust chamber each form an independent sealed space. Finished product: The pressurized sealing assembly and piston assembly are pre-assembled. The piston is inserted into the guide post of the piston bracket 7 of the piston assembly through the guide hole of the one-way base 4. This semi-finished product is then assembled with the motor drive assembly. The turntable drive shaft 9 is inserted into the oblique hole of the eccentric wheel 10. The guide hole of the piston bracket 7 is inserted into the guide post of the motor mounting base 13. The assembly is fixed by threaded assembly using self-tapping screws 1.

[0035] Fluid operation process: The sealed cavity at the front end is connected to the air extraction port of the motor mounting base 7. Gas enters the first air inlet chamber A of the pump body. The gas passes through the first air inlet holes 701 on the six outer sides of the piston bracket 7 and the second air inlet holes 601 on the six outer sides of the piston 6 in sequence. Then, it passes through the third air inlet holes 401 on the six outer sides of the one-way base 4 and enters the second air inlet chamber B. The second air inlet chamber B and the piston chamber C are sealed and isolated by the air inlet one-way valve 5. This seal is normally closed. When the piston bladder 602 is sucked downwards for operation, the air inlet one-way valve 5 opens and the fluid enters the piston chamber C. When the piston bladder 602 is discharged upwards for operation, the air inlet one-way valve 5 closes and the air outlet one-way valve 301 of the corresponding chamber of the first sealing gasket 3 opens, and the fluid is discharged to the air outlet chamber D. This fluid working cycle reduces the pressure of the sealed cavity (below the external atmospheric pressure), i.e., vacuuming.

[0036] After the motor 15 is powered on, the motor drive shaft 1501 of the motor 15 rotates, driving the eccentric wheel 10 to rotate. The eccentric wheel 10 drives the turntable assembly to rotate eccentrically. The eccentric rotation of the turntable assembly drives the three bladders 602 of the piston 6 to perform suction and discharge operations in sequence. When the bladder 602 of the piston 6 is pulled down, the pressure inside the cavity decreases, forming a negative pressure that opens the air intake check valve 5, allowing fluid to enter the piston cavity C. When the bladder 602 is pushed up, the fluid is discharged from the air outlet check valve 301 of the corresponding chamber of the first sealing gasket 3. Through this cycle, the stable operation of the fluid is achieved.

[0037] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A water vapor resistant diaphragm vacuum pump, characterized in that, include: Piston assembly; Motor (15), which has a motor drive shaft (1501); A motor mounting base (13) is connected between the piston assembly and the motor (15), and the motor drive shaft (1501) passes through the motor mounting base (13) and is connected to the piston assembly in a transmission manner. as well as The second sealing gasket (14) is disposed between the motor mounting base (13) and the motor (15) and is sleeved on the outer periphery of the motor drive shaft (1501).

2. The water-resistant diaphragm vacuum pump according to claim 1, characterized in that, The second sealing gasket (14) includes a second inner sealing ring (1402); the inner peripheral wall of the second inner sealing ring (1402) is formed with an upper sealing lip (1406) and a lower sealing lip (1405) that are sealed to the outer peripheral wall of the motor drive shaft (1501), and the upper sealing lip (1406) and the lower sealing lip (1405) are separated by a certain distance.

3. The water-resistant diaphragm vacuum pump according to claim 2, characterized in that, The upper sealing lip (1406) is a disc-shaped sealing lip with an inclination of α where the inner circumference is higher than the outer circumference, and the lower sealing lip (1405) is a horizontally arranged annular sealing lip.

4. The water-resistant diaphragm vacuum pump according to claim 3, characterized in that, The inner circumference of the lower sealing lip (1405) is a conical surface with an inner higher surface and an outer lower surface, and an inclination of β.

5. The water-resistant diaphragm vacuum pump according to claim 3, characterized in that, The inner circumference of the upper sealing lip (1406) is a conical surface with an inner higher surface and an outer lower surface, and an inclination of γ.

6. The water-resistant diaphragm vacuum pump according to claim 1, characterized in that, The second sealing gasket (14) includes a second outer sealing ring (1401). The outer peripheral wall of the second outer sealing ring (1401) is formed with an upper sealing convex ring (1404) and a lower sealing convex ring (1403). The upper sealing convex ring (1404) is provided with a convex curved surface that seals with the motor mounting base (13), and the lower sealing convex ring (1403) is provided with a convex curved surface that seals with the outer wall of the motor (15).

7. The water-resistant diaphragm vacuum pump according to claim 6, characterized in that, The motor mounting base (13) is provided with a sealing groove (1302) that is adapted to the second sealing gasket (14). The upper sealing convex ring (1404) is squeezed and deformed between the second sealing gasket (14) and the motor mounting base (13). The lower sealing convex ring (1403) is squeezed and deformed between the second sealing gasket (14) and the outer wall of the motor (15).

8. The water-resistant diaphragm vacuum pump according to any one of claims 1-7, characterized in that, The piston assembly includes a piston (6), a piston support (7), a turntable (8), a turntable drive shaft (9), and an eccentric wheel (10). The piston support (7) is connected to the motor mounting base (13). The piston (6) has multiple bladders (602). The piston support (7) has bladder mounting holes (702) that correspond one-to-one with the multiple bladders (602). The bladders (602) are installed in the bladder mounting holes (702) and the chamber formed by connecting the piston support (7) and the motor mounting base (13) is divided into a first air intake chamber (A) located outside the piston (6) and a piston chamber (C) located inside the piston (6). The motor mounting base (13) has an air inlet (1301) connected to the first air intake chamber (A). The turntable (8), turntable drive shaft (9) and eccentric wheel (10) are connected in sequence and disposed in the first air intake chamber (A), and the eccentric wheel (10) is sleeved on the motor drive shaft (1501); The turntable (8) is connected to the plurality of bladders (602).

9. The water-resistant diaphragm vacuum pump according to claim 8, characterized in that, It also includes an O-ring seal (11); the O-ring seal (11) is disposed between the piston bracket (7) and the motor mounting base (13).

10. The water-resistant diaphragm vacuum pump according to claim 8, characterized in that, It also includes a pressurization chamber (2), a first sealing gasket (3), a one-way base (4), and an intake one-way valve (5); The pressurization chamber (2), the one-way base (4), and the piston bracket (7) are connected in sequence; The pressurization chamber (2) and the one-way base (4) form a second air inlet chamber (B) and an air outlet chamber (D). A first channel is provided to connect the first air inlet chamber (A) and the second air inlet chamber (B), a second channel to connect the second air inlet chamber (B) and the piston chamber (C), and a third channel to connect the piston chamber (C) and the air outlet chamber (D). The first sealing gasket (3) is fixed between the pressurization chamber (2) and the one-way base (4), and an exhaust one-way valve (301) is integrated on it. The exhaust one-way valve (301) acts to control the one-way air passage from the piston chamber (C) to the exhaust chamber (D) formed by the third channel. The one-way valve (5) is connected to the one-way base (4) and acts to control the one-way airflow from the second intake chamber (B) to the piston chamber (C) in the direction of the second channel.

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