Oil-free diaphragm vacuum pump

Abstract

The invention relates to the technical field of pump equipment, in particular to an oil-free diaphragm vacuum pump which comprises a shell unit, the shell unit comprises a stand column, one side of the stand column is fixedly connected with a partition row through a first flange plate, the upper end of the stand column is fixedly connected with an outlet guide pipe, and the lower end of the stand column is fixedly connected with an inlet guide pipe. Switch units are arranged in the outlet guide pipe and the inlet guide pipe, a driving unit is arranged in a cavity formed by the stand columns and the partition rows, a sealing unit is arranged on one side of the driving unit, and a cleaning unit is arranged on the sealing unit. According to the invention, the driving unit drives the diaphragm to reciprocate, so that the piston is driven by the push rod to suck the filtered liquid into the water suction cavity, and then the liquid in the water suction cavity is discharged to the periphery of the corresponding valve seat before the water plugging ball is attached to the valve seat, and an environment filled with the filtered liquid is created around the valve seat; therefore, the situation that after the water plugging ball and the valve seat are attached, particles exist in the attached position of the water plugging ball and the valve seat, the sealing effect is poor, and the liquid conveying performance of the device is reduced is prevented.

Description

Technical Field

[0001] The invention relates to the technical field of pump equipment, in particular to an oil-free diaphragm vacuum pump. Background Art

[0002] A diaphragm pump is a positive displacement pump that delivers liquids through a flexible diaphragm. The diaphragm pump is mainly composed of a frame, a mechanical transmission system, a plunger and a cylinder, a diaphragm and a diaphragm chamber, a valve and a valve chamber, and other main components. The diaphragm isolates the liquid from the rest of the pump, thereby protecting the internal components of the pump from corrosion or wear. When the diaphragm moves to one side of the transmission mechanism, negative pressure is formed in the pump cylinder, sucking in liquid; when the diaphragm moves to the other side, the liquid is discharged. This process is repeated continuously, thereby achieving continuous liquid delivery.

[0003] The valve of a traditional diaphragm pump generally uses a water-blocking ball and a valve seat to close and open the water channel. When the water channel needs to be closed, the water-blocking ball and the valve seat fit together to form a closed water channel. When the water channel needs to be opened, the water-blocking ball and the valve seat are separated. At this time, the water channel is open. However, when conveying liquid with particles, the water-blocking ball and the valve seat fit together and press the particles in the liquid, causing the water-blocking ball and the valve seat to press the oil particles at the contact point. The two cannot fit completely together, and thus the water channel cannot be completely closed, affecting the performance of the pump body in conveying liquid.

[0004] In view of this, the present invention proposes an oil-free diaphragm vacuum pump to solve the above technical problems. Summary of the invention

[0005] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0006] An oil-free diaphragm vacuum pump comprises a housing unit, wherein the housing unit comprises a column, one side of the column is fixedly connected to a spacer row via a No. 1 flange, the upper end of the column is fixedly connected to an outlet duct, the lower end of the column is fixedly connected to an inlet duct, a switch unit is arranged in each of the outlet duct and the inlet duct, a driving unit is arranged in a cavity formed by the column and the spacer row, a sealing unit is arranged on one side of the driving unit, and a cleaning unit is arranged on the sealing unit; Wherein, the switch unit comprises a valve seat, and the valve seat is fixedly connected to the inner walls of the outlet conduit and the inlet conduit; The sealing unit includes a water absorption chamber, which is fixedly connected to the inner wall of the column, a piston is slidably connected in the water absorption chamber, a push-pull rod is fixedly connected to the end of the piston close to the driving unit, an upper water absorption pipe and an upper water guide pipe are fixedly connected to the end of the water absorption chamber close to the driving unit, a lower water absorption pipe and a lower water guide pipe are fixedly connected to the end of the water absorption chamber away from the driving unit, the other ends of the upper water guide pipe and the lower water guide pipe extend to the valve seats in the outlet conduit and the inlet conduit respectively, the ends of the lower water absorption pipe and the upper water absorption pipe are fixedly connected to the lower filter plate and the upper filter plate respectively, a lower blocking block and an upper blocking block are provided in the water absorption chamber, the lower blocking block is used to prevent the piston from crossing the lower water absorption pipe, and the upper blocking block is used to prevent the piston from crossing the upper water absorption pipe.

[0007] As a preferred solution of the oil-free diaphragm vacuum pump provided by the present invention, the structure formed by the column and the partition row and the outlet duct and the inlet duct is a pair, which are connected by a connecting piece in the middle, the left and right outlet ducts are connected, and the outlet duct is provided with a water outlet, and the left and right inlet ducts are connected, and the inlet duct is provided with a water inlet.

[0008] As a preferred solution of the oil-free diaphragm vacuum pump provided in the present invention, a second flange is provided on the outlet conduit and the inlet conduit at the installation position of the switch unit, and the second flange is convenient for disassembly for maintenance of the switch unit. As a preferred solution of the oil-free diaphragm vacuum pump provided in the present invention, the switch unit includes a water blocking ball, which is fixedly connected to the valve seat via a reset spring, and a limit block is provided above the water blocking ball, which is fixedly connected to the pipe wall.

[0009] As a preferred solution of the oil-free diaphragm vacuum pump provided by the present invention, the driving unit includes a diaphragm, the outer side of the diaphragm is fixedly connected to the inner wall of the partition row, the middle part of one end of the diaphragm close to the water absorption chamber is fixedly connected to the push-pull rod, and the middle part of one end of the diaphragm away from the water absorption chamber is fixedly connected to the driving rod.

[0010] As a preferred solution of the oil-free diaphragm vacuum pump provided by the present invention, the driving unit also includes a driving chamber, the driving chamber is fixedly connected between the two rows, a sliding block is provided in the driving chamber, limit rods slide through the upper and lower ends of the sliding block, both ends of the limit rods are fixedly connected in the driving chamber, an opening is opened on the sliding block, a driving disk is provided in the opening, a rotating disk is provided at one end of the driving disk, the driving disk is fixedly connected to a non-center position of the rotating disk, the rotating disk and the output shaft of the motor are fixedly connected, and the motor is fixedly connected to the outer wall of the driving chamber.

[0011] As a preferred solution of the oil-free diaphragm vacuum pump provided by the present invention, the cleaning unit includes an upper L-shaped connecting rod, the end of the upper L-shaped connecting rod is fixedly connected to an upper cleaning brush, the upper cleaning brush is fitted with the upper filter plate, one end of the upper L-shaped connecting rod away from the upper filter plate is fixedly connected to the push-pull rod, the push-pull rod is also fixedly connected to a lower L-shaped connecting rod, the other end of the lower L-shaped connecting rod is fixedly connected to a lower cleaning brush, and the lower cleaning brush is fitted with the lower filter plate.

[0012] As a preferred solution of the oil-free diaphragm vacuum pump provided by the present invention, one-way valves are provided in the lower water suction pipe, the lower water guide pipe, the upper water suction pipe and the upper water guide pipe.

[0013] Beneficial effects of the present invention: In the present invention, the driving unit drives the diaphragm to move back and forth, thereby driving the piston to absorb the filtered liquid into the water absorption chamber through the push rod, and then before the water blocking ball and the valve seat are attached, the liquid in the water absorption chamber is discharged to the surrounding of the corresponding valve seat, creating an environment full of filtered liquid around the valve seat, thereby preventing the water blocking ball and the valve seat from being attached to each other. The position where the two are attached has particles, resulting in poor sealing effect, and thus reducing the liquid transportation performance of the device. At the same time, the push-pull rod will drive the upper L-shaped connecting rod and the lower L-shaped connecting rod to move back and forth when moving back and forth, so that the upper cleaning brush and the lower cleaning brush move back and forth to clean the upper filter plate and the lower filter plate respectively to prevent blockage. At the same time, the liquid will be discharged during cleaning, and the liquid will have a flowing effect, which cooperates with the cleaning brush to further improve the effect of cleaning particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0015] in: Figure 1 It is a schematic diagram of the overall structure of an oil-free diaphragm vacuum pump; Figure 2 This is a schematic diagram of the back structure of an oil-free diaphragm vacuum pump; Figure 3 It is a schematic diagram of the cross-sectional structure of an oil-free diaphragm vacuum pump; Figure 4 for Figure 3 A schematic diagram of the structure enlargement in the middle; Figure 5 for Figure 4 A magnified schematic diagram of the structure at B in the middle; Figure 6 This is a schematic diagram of the connection structure of a drive unit in an oil-free diaphragm vacuum pump; Figure 7 A schematic diagram of the connection structure of a sealing unit and a cleaning unit in an oil-free diaphragm vacuum pump; Figure 8 The figure is a schematic diagram of the connection structure inside the water absorption chamber of an oil-free diaphragm vacuum pump.

[0016] In the figure: 1. Shell unit; 11. Column; 12. No. 1 flange; 13. Outlet duct; 14. Water outlet; 15. Inlet duct; 16. Water inlet; 17. No. 2 flange; 18. Connector; 19. Spacer; 2. Switch unit; 21. Water blocking ball; 22. Valve seat; 23. Return spring; 24. Limit block; 3. driving unit; 31. diaphragm; 32. driving chamber; 33. sliding block; 34. opening; 35. limiting rod; 36. driving disk; 37. rotating disk; 38. motor; 39. driving rod; 4. Sealing unit; 41. Water absorption chamber; 42. Push-pull rod; 43. Piston; 44. Lower water absorption pipe; 45. Lower filter plate; 46. Lower water guide pipe; 47. Lower blocking block; 48. Upper water absorption pipe; 49. Upper water guide pipe; 410. Upper blocking block; 411. Upper filter plate; 5. Cleaning unit; 51. Upper L-shaped connecting rod; 52. Upper cleaning brush; 53. Lower L-shaped connecting rod; 54. Lower cleaning brush. DETAILED DESCRIPTION

[0017] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] Example like Figure 1-8 As shown, an oil-free diaphragm vacuum pump comprises a housing unit 1, the housing unit 1 comprises a column 11, one side of the column 11 is fixedly connected to a spacer 19 through a No. 1 flange 12, the upper end of the column 11 is fixedly connected to an outlet duct 13, the lower end of the column 11 is fixedly connected to an inlet duct 15, a switch unit 2 is arranged in both the outlet duct 13 and the inlet duct 15, a driving unit 3 is arranged in a cavity formed by the column 11 and the spacer 19, a sealing unit 4 is arranged on one side of the driving unit 3, and a cleaning unit 5 is arranged on the sealing unit 4; The switch unit 2 includes a valve seat 22, which is fixedly connected to the inner walls of the outlet conduit 13 and the inlet conduit 15; The sealing unit 4 includes a water suction chamber 41, which is fixedly connected to the inner wall of the column 11, a piston 43 is slidably connected in the water suction chamber 41, a push-pull rod 42 is fixedly connected to one end of the piston 43 close to the driving unit 3, an upper water suction pipe 48 and an upper water guide pipe 49 are fixedly connected to one end of the water suction chamber 41 close to the driving unit 3, a lower water suction pipe 44 and a lower water guide pipe 46 are fixedly connected to one end of the water suction chamber 41 away from the driving unit 3, the other ends of the upper water guide pipe 49 and the lower water guide pipe 46 extend to the valve seats 22 in the outlet conduit 13 and the inlet conduit 15 respectively, a lower filter plate 45 and an upper filter plate 411 are fixedly connected to the ends of the lower water suction pipe 44 and the upper water suction pipe 48 respectively, a lower blocking block 47 and an upper blocking block 410 are provided in the water suction chamber 41, the lower blocking block 47 is used to prevent the piston 43 from crossing the lower water suction pipe 44, and the upper blocking block 410 is used to prevent the piston 43 from crossing the upper water suction pipe 48; One-way valves are provided in the lower water suction pipe 44, the lower water guide pipe 46, the upper water suction pipe 48 and the upper water guide pipe 49; The structure formed by the column 11 and the spacer 19 as well as the outlet duct 13 and the inlet duct 15 is a pair, which is connected by a connector 18 in the middle, the left and right outlet ducts 13 are connected, and the outlet duct 13 is provided with a water outlet 14, and the left and right inlet ducts 15 are connected, and the inlet duct 15 is provided with a water inlet 16; A second flange 17 is provided on the outlet conduit 13 and the inlet conduit 15 at the installation position of the switch unit 2. The second flange 17 is convenient for disassembly and is used for maintenance of the switch unit 2. The switch unit 2 comprises a water blocking ball 21 , which is fixedly connected to a valve seat 22 via a return spring 23 , and a limit block 24 is provided above the water blocking ball 21 , which is fixedly connected to the pipe wall.

[0019] In the embodiment, the left and right diaphragms 31 start to push the liquid back and forth. Figure 3As shown, at this time, the driving rod 39 on the left drives the diaphragm 31 on the left to contract, and the pressure in the left cavity decreases. The water blocking ball 21 in the lower left inlet conduit 15 is flushed open by the liquid, and the return spring 23 here is stretched. At the same time, the liquid enters the left cavity from the water inlet 16. In this process, the water blocking ball 21 in the upper left outlet conduit 13 is close to the valve seat 22, and the upper left outlet conduit 13 is blocked, completing the liquid suction process of the left cavity. Then the driving rod 39 drives the diaphragm 31 on the left to stretch. At this time, the pressure in the left cavity increases. At this time, the liquid breaks open the water blocking ball 21 of the left outlet conduit 13, and at the same time the reset spring 23 here is stretched, and the liquid is discharged from the cavity on the left to the water outlet 14. In this process, the liquid pushes the water blocking ball 21 and the valve seat 22 in the left inlet conduit 15 to fit tightly, forming a blockage of the left inlet conduit 15, completing the discharge of the liquid in the left cavity. According to the foregoing, the movement relationship in the right cavity of the device is consistent with that in the left cavity, and the two move in coordination, so that the liquid is sucked in from the water inlet 16 and then discharged from the water outlet 14, achieving the effect of liquid transportation.

[0020] It should be understood that the water-blocking ball 21 is connected to the valve seat 22 through a reset spring 23. When the water-blocking ball 21 and the valve seat 22 fit together, the reset spring 23 is in a natural state. When liquid passes through the pipeline, the water-blocking ball 21 will leave the valve seat 22, and the reset spring 23 will stretch at the same time. Therefore, when the diaphragm 31 moves back and forth, the contraction of the reset spring 23 can quickly drive the water-blocking ball 21 to fit the valve seat 22, and quickly block the pipeline. If there is no reset spring 23, for example, the diaphragm 31 stretches, the water-blocking ball 21 in the inlet conduit 15 is originally flushed open by the liquid, and now it is immediately converted into a liquid discharge process. During the time when the water-blocking ball 21 and the valve seat 22 fit together, part of the liquid will be discharged from the inlet conduit 15, and will not be discharged from the outlet conduit 13, which will reduce the liquid conveying capacity of the device. The contraction force of the reset spring 23 can quickly reset the water-blocking ball 21, shorten the reset time, and thus improve the performance of the device.

[0021] When the diaphragm 31 drives the push-pull rod 42 to move back and forth, the push-pull rod 42 drives the piston 43 to slide in the water suction chamber 41. When the piston 43 moves toward the lower water pipe 46, the piston 43 pushes part of the liquid from the lower water pipe 46 (the one-way valve of the lower water pipe 46 only flows out but not in, and the one-way valve of the lower water suction pipe 44 only flows in but not out) to the valve seat 22 at the inlet conduit 15. In this process, the liquid enters the water suction chamber 41 after being filtered from the upper water suction pipe 48 through the upper filter plate 411 (the one-way valve of the upper water suction pipe 49 only flows out but not in, and the one-way valve of the upper water suction pipe 48 only flows in but not out). When the piston 43 moves toward the upper water pipe 49, the liquid enters the water suction chamber 41 from the lower water suction pipe 44 through the lower filter plate 45. In this process, the piston 43 pushes part of the liquid from the upper water pipe 49 to the valve seat 22 of the outlet conduit 13.

[0022] It should be noted that when the piston 43 moves toward the lower water pipe 46, it should be the process of cavity drainage. At this time, the water blocking ball 21 at the inlet conduit 15 moves toward the valve seat 22, thereby blocking the inlet conduit 15. In this process, the filtered liquid in the lower water pipe 46 is sprayed out from the valve seat 22 there, so that the area around the valve seat 22 is filled with filtered liquid, and then the water blocking ball 21 fits the valve seat 22 to complete the blocking of the inlet conduit 15. Because if there is still liquid with particles around the valve seat 22, then after the water blocking ball 21 and the valve seat 22 fit, there are particles at the fitting position between the two, resulting in poor sealing effect, so that part of the liquid will be discharged from the inlet conduit 15 during drainage, thereby affecting the performance of the device.

[0023] When the piston 43 moves toward the upper water pipe 49, it should be the process of the cavity absorbing liquid. At this time, the water blocking ball 21 at the outlet conduit 13 moves toward the valve seat 22, thereby blocking the outlet conduit 13. In this process, the filtered liquid in the upper water pipe 49 is ejected from the valve seat 22 there, so that the area around the valve seat 22 is filled with the filtered liquid. Then the water blocking ball 21 fits the valve seat 22 to complete the blocking of the outlet conduit 13. The reciprocating movement of the diaphragm 31 drives the water absorption cavity 41 to absorb the filtered liquid into the interior. Then, before the water blocking ball 21 and the valve seat 22 fit, an environment filled with filtered liquid is created around the valve seat 22, thereby preventing the water blocking ball 21 and the valve seat 22 from fitting together. After the fitting, there are particles at the fitting position between the two, resulting in poor sealing effect, thereby reducing the liquid transportation performance of the device.

[0024] like Figure 1 , Figure 2 , Figure 3 and Figure 6 As shown, the driving unit 3 includes a diaphragm 31, the outer side of the diaphragm 31 is fixedly connected to the inner wall of the spacer 19, the middle part of one end of the diaphragm 31 close to the water absorption cavity 41 is fixedly connected to the push-pull rod 42, and the middle part of one end of the diaphragm 31 away from the water absorption cavity 41 is fixedly connected to the driving rod 39; The driving unit 3 also includes a driving chamber 32, which is fixedly connected between two partition rows 19. A sliding block 33 is provided in the driving chamber 32. Limiting rods 35 slide through the upper and lower ends of the sliding block 33. Both ends of the limiting rods 35 are fixedly connected in the driving chamber 32. An opening 34 is provided on the sliding block 33. A driving disk 36 is provided in the opening 34. A rotating disk 37 is provided at one end of the driving disk 36. The driving disk 36 is fixedly connected to a non-center position of the rotating disk 37. The rotating disk 37 is fixedly connected to the output shaft of the motor 38. The motor 38 is fixedly connected to the outer wall of the driving chamber 32.

[0025] In the embodiment, after the motor 38 is started, it drives the rotating disk 37 to rotate. The rotation of the rotating disk 37 drives the driving disk 36 to rotate around the center of the rotating disk 37. When the driving disk 36 rotates, it drives the sliding block 33 to move. With the cooperation of the opening 34 and the limiting rod 35, the sliding block 33 reciprocates along the limiting rod 35. The reciprocating motion of the sliding block 33 drives the left and right diaphragms 31 to reciprocate and push the liquid through the driving rod 39.

[0026] like Figure 3 , Figure 4 , Figure 5 , Figure 7 and Figure 8 As shown, the cleaning unit 5 includes an upper L-shaped connecting rod 51, the end of the upper L-shaped connecting rod 51 is fixedly connected to an upper cleaning brush 52, the upper cleaning brush 52 is fitted with the upper filter plate 411, one end of the upper L-shaped connecting rod 51 away from the upper filter plate 411 is fixedly connected to the push-pull rod 42, the push-pull rod 42 is also fixedly connected to a lower L-shaped connecting rod 53, the other end of the lower L-shaped connecting rod 53 is fixedly connected to a lower cleaning brush 54, and the lower cleaning brush 54 is fitted with the lower filter plate 45.

[0027] In the embodiment, the push-pull rod 42 drives the upper L-shaped connecting rod 51 and the lower L-shaped connecting rod 53 to move reciprocally when it moves back and forth. The upper L-shaped connecting rod 51 and the lower L-shaped connecting rod 53 drive the upper cleaning brush 52 and the lower cleaning brush 54 to move respectively. The upper cleaning brush 52 and the lower cleaning brush 54 move back and forth to clean the upper filter plate 411 and the lower filter plate 45 respectively to prevent blockage. At the same time, liquid will be discharged during cleaning. The liquid will have a flowing effect, which cooperates with the cleaning to further improve the effect of cleaning particles.

[0028] The workflow is as follows: After the motor 38 is started, it drives the rotating disk 37 to rotate. The rotation of the rotating disk 37 drives the driving disk 36 to rotate around the center of the rotating disk 37. When the driving disk 36 rotates, it drives the sliding block 33 to move. Under the cooperation of the opening 34 and the limit rod 35, the sliding block 33 reciprocates along the limit rod 35. The reciprocating movement of the sliding block 33 drives the left and right diaphragms 31 to reciprocate and push the liquid through the driving rod 39. The driving rod 39 drives the diaphragm 31 on the left to contract. At this time, the pressure in the left cavity decreases, and the water blocking ball 21 in the lower left inlet conduit 15 is flushed open by the liquid. The reset spring 23 here is stretched, and at the same time, the liquid enters the left cavity from the water inlet 16. In this process, the water blocking ball 21 in the upper left outlet conduit 13 is close to the valve seat 22, blocking the upper left outlet conduit 13, completing the liquid suction process of the left cavity. Then the driving rod 39 drives the diaphragm 31 on the left to extend. At this time, the pressure in the left cavity increases. At this time, the liquid The water blocking ball 21 of the left outlet conduit 13 is flushed open, and the reset spring 23 is stretched at the same time, and the liquid is discharged from the left cavity to the water outlet 14. In this process, the liquid pushes the water blocking ball 21 and the valve seat 22 in the left inlet conduit 15 to close together, forming a blockage of the left inlet conduit 15, and completing the discharge of the liquid in the left cavity. According to the above, the movement relationship in the right cavity of the device is consistent with that in the left cavity, and the two move in coordination, so that the liquid is sucked from the water inlet 16 and then discharged from the water outlet 14, achieving the effect of liquid transportation. At the same time, when the diaphragm 31 drives the push-pull rod 42 to move back and forth, the push-pull rod 42 drives the piston 43 to slide in the water suction chamber 41. When the piston 43 moves toward the lower water conduit 46, the piston 43 pushes part of the liquid from the lower water conduit 46 to the valve seat 22 at the inlet conduit 15, and pushes the liquid around the valve seat 22 at this place. In this process, the liquid enters the water suction chamber 41 after being filtered from the upper water suction pipe 48 through the upper filter plate 411. When the piston 43 moves toward the upper water pipe 49, the liquid enters the water suction chamber 41 from the lower water suction pipe 44 through the lower filter plate 45. In this process, the piston 43 pushes part of the liquid from the upper water pipe 49 to the valve seat 22 of the outlet conduit 13, pushing the liquid around the valve seat 22, thereby preventing the water blocking ball 21 and the valve seat 22 from fitting together, and causing particles to be present inside, resulting in poor sealing effect, thereby reducing the liquid conveying performance of the device. At the same time, the push-pull rod 42 will drive the upper L-shaped connecting rod 51 and the lower L-shaped connecting rod 53 to move back and forth when reciprocating, and the upper L-shaped connecting rod 51 and the lower L-shaped connecting rod 53 will drive the upper cleaning brush 52 and the lower cleaning brush 54 to move respectively, and the upper cleaning brush 52 and the lower cleaning brush 54 will reciprocate to clean the upper filter plate 411 and the lower filter plate 45 respectively to prevent blockage. At the same time, the liquid will be discharged during cleaning, and the liquid will have a flowing effect, which cooperates with the cleaning brush to further improve the effect of cleaning particles.

[0029] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. An oil-free diaphragm vacuum pump, comprising a housing unit (1), characterized in that: The housing unit (1) comprises a column (11), one side of the column (11) is fixedly connected to a spacer (19) via a flange (12), the upper end of the column (11) is fixedly connected to an outlet duct (13), the lower end of the column (11) is fixedly connected to an inlet duct (15), a switch unit (2) is provided in each of the outlet duct (13) and the inlet duct (15), a driving unit (3) is provided in a cavity formed by the column (11) and the spacer (19), a sealing unit (4) is provided on one side of the driving unit (3), and a cleaning unit (5) is provided on the sealing unit (4); Wherein, the switch unit (2) comprises a valve seat (22), and the valve seat (22) is fixedly connected to the inner walls of the outlet conduit (13) and the inlet conduit (15); The sealing unit (4) comprises a water absorption chamber (41), the water absorption chamber (41) being fixedly connected to the inner wall of the column (11), a piston (43) being slidably connected in the water absorption chamber (41), a push-pull rod (42) being fixedly connected to one end of the piston (43) close to the driving unit (3), an upper water absorption pipe (48) and an upper water guide pipe (49) being fixedly connected to one end of the water absorption chamber (41) close to the driving unit (3), a lower water absorption pipe (44) and a lower water guide pipe (46) being fixedly connected to one end of the water absorption chamber (41) away from the driving unit (3), and the upper water guide pipe (49) being fixedly connected to one end of the water absorption chamber (41) away from the driving unit (3). ) and the other end of the lower water conduit (46) extend to the valve seat (22) in the outlet conduit (13) and the inlet conduit (15), respectively; the ends of the lower water suction pipe (44) and the upper water suction pipe (48) are fixedly connected to a lower filter plate (45) and an upper filter plate (411), respectively; a lower blocking block (47) and an upper blocking block (410) are provided in the water suction chamber (41); the lower blocking block (47) is used to prevent the piston (43) from crossing the lower water suction pipe (44); and the upper blocking block (410) is used to prevent the piston (43) from crossing the upper water suction pipe (48).

2. The oil-free diaphragm vacuum pump as claimed in claim 1, characterized in that: The structure formed by the upright column (11) and the partition row (19) as well as the outlet duct (13) and the inlet duct (15) is a pair, which is connected by a connecting piece (18) in the middle, the two left and right outlet ducts (13) are connected, and the outlet duct (13) is provided with a water outlet (14), and the two left and right inlet ducts (15) are connected, and the inlet duct (15) is provided with a water inlet (16).

3. The oil-free diaphragm vacuum pump as claimed in claim 2, characterized in that: A second flange (17) is provided on the outlet duct (13) and the inlet duct (15) at the installation position of the switch unit (2); the second flange (17) is easy to disassemble and is used for maintenance of the switch unit (2).

4. The oil-free diaphragm vacuum pump as claimed in claim 3, characterized in that: The switch unit (2) comprises a water blocking ball (21), the water blocking ball (21) being fixedly connected to the valve seat (22) via a return spring (23), a limit block (24) being provided above the water blocking ball (21), the limit block (24) being fixedly connected to the pipe wall.

5. The oil-free diaphragm vacuum pump as claimed in claim 4, characterized in that: The driving unit (3) comprises a diaphragm (31), the outer side of the diaphragm (31) being fixedly connected to the inner wall of the partition row (19), the middle part of one end of the diaphragm (31) close to the water absorption chamber (41) being fixedly connected to the push-pull rod (42), and the middle part of one end of the diaphragm (31) away from the water absorption chamber (41) being fixedly connected to the driving rod (39).

6. The oil-free diaphragm vacuum pump as claimed in claim 5, characterized in that: The drive unit (3) further comprises a drive chamber (32), wherein the drive chamber (32) is fixedly connected between the two spacing rows (19), wherein a sliding block (33) is provided in the drive chamber (32), wherein a limit rod (35) slides through the upper and lower ends of the sliding block (33), and both ends of the limit rod (35) are fixedly connected in the drive chamber (32), wherein an opening (34) is provided in the sliding block (33), wherein a drive disk (36) is provided in the opening (34), wherein a rotating disk (37) is provided at one end of the drive disk (36), wherein the drive disk (36) is fixedly connected at a non-central position of the rotating disk (37), wherein the rotating disk (37) is fixedly connected to an output shaft of a motor (38), and wherein the motor (38) is fixedly connected to an outer wall of the drive chamber (32).

7. The oil-free diaphragm vacuum pump as claimed in claim 6, characterized in that: The cleaning unit (5) comprises an upper L-shaped connecting rod (51), an upper cleaning brush (52) being fixedly connected to the end of the upper L-shaped connecting rod (51), the upper cleaning brush (52) being fitted to the upper filter plate (411), one end of the upper L-shaped connecting rod (51) away from the upper filter plate (411) being fixedly connected to the push-pull rod (42), the push-pull rod (42) being further fixedly connected to a lower L-shaped connecting rod (53), the other end of the lower L-shaped connecting rod (53) being fixedly connected to a lower cleaning brush (54), the lower cleaning brush (54) being fitted to the lower filter plate (45).

8. The oil-free diaphragm vacuum pump as claimed in claim 7, characterized in that: One-way valves are provided in the lower water suction pipe (44), the lower water guide pipe (46), the upper water suction pipe (48) and the upper water guide pipe (49).

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