Pneumatic diaphragm pump

Abstract

The utility model relates to the technical field of diaphragm pumps, and discloses a pneumatic diaphragm pump which comprises a valve body shell, diaphragm shells are arranged on the two sides of the valve body shell respectively, air inlets are formed in the diaphragm shells, a first shell is connected to the valve body shell in a threaded mode, a liquid outlet is formed in the first shell, and a second shell is connected to the valve body shell in a threaded mode. The valve body shell is in threaded connection with a second shell, and a liquid pumping opening is formed in the second shell. According to the utility model, the reciprocating motion of the connecting rod is controlled through the motor, and the position of the adjusting plug in the air inlet hole and the central column is controlled, so that the inlet space of compressed air in the valve body shell is controlled; and positive pressure and negative pressure are alternately formed in a first cavity, a second cavity, a third cavity and a fourth cavity in the valve body shell through cooperation of diaphragms at the two ends of the sliding connecting plate, so that water is continuously pumped into the valve body shell from a liquid pumping opening and discharged from a liquid outlet, water is pumped from the two sides in a segmented mode, continuous and stable fluid flowing can be provided, and pressure fluctuation of a pump body is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of diaphragm pumps, in particular to a pneumatic diaphragm pump. Background Art

[0002] A pneumatic diaphragm pump is a special type of pump that uses pneumatic power to drive the transportation of fluids. Pneumatic diaphragm pumps are widely used in chemical, pharmaceutical, food processing, wastewater treatment, mining, and many other industries, especially in fluid transportation applications that require pollution-free, low-maintenance, and high-reliability.

[0003] Traditional fluid transportation equipment, such as centrifugal pumps and piston pumps, usually has some limitations. For example, they have a relatively large shear force on the fluid, are not suitable for handling viscous or solid-particle-containing media, and may cause fluid contamination during transportation. At the same time, with single-channel liquid extraction, the pump body pressure fluctuates severely, the fluid flow inside the pump is not smooth enough, and some pump bodies have more moving parts, resulting in greater internal component wear and shorter service life during long-term operation. Therefore, the utility model proposes a pneumatic diaphragm pump to solve the problems existing in the prior art. Summary of the Utility Model

[0004] The purpose of the utility model is to propose a pneumatic diaphragm pump to solve the shortcomings existing in the prior art.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme: A pneumatic diaphragm pump includes a valve body housing. Diaphragm housings are respectively arranged on both sides of the valve body housing. An air inlet hole is arranged on the diaphragm housing. A first housing is threadedly connected to the valve body housing. A liquid outlet is arranged on the first housing. A second housing is threadedly connected to the valve body housing. A liquid suction port is arranged on the second housing. A central column is fixedly connected inside the valve body housing. A sliding connecting plate is slidably connected to the central column. A first cavity, a second cavity, a third cavity, and a fourth cavity are arranged inside the valve body housing. A blocking piece is fixedly connected inside the central column. A diaphragm pump ball is arranged inside the valve body housing.

[0006] As a further description of the above technical scheme:

[0007] A fixing plate is fixedly connected to the diaphragm housing. A motor is fixedly connected to the fixing plate. A disc is fixedly connected to the output end of the motor. A limiting column is fixedly connected to the disc. A limiting groove is slidably connected to the limiting column. A connecting rod is fixedly connected to the limiting groove. One end of the connecting rod is fixedly connected to an adjusting plug. A guiding block is fixedly connected to the air inlet hole. The connecting rod slidably penetrates through the guiding block.

[0008] As a further description of the above technical scheme:

[0009] A through hole is provided in the adjusting plug, a sealing gasket is fixedly connected to one end of the adjusting plug, a plurality of groups of through holes are provided on the blocking piece, the through holes on the sealing gasket are in fit with the through holes on the blocking piece, and the adjusting plug slides in the air inlet hole and the central column respectively.

[0010] As a further description of the above technical solution:

[0011] Diaphragms are respectively provided at both ends of the sliding connecting plate, the two diaphragms are respectively fixedly connected in the diaphragm housing, and the two diaphragms divide the inside of the valve body housing into four parts, which are the first cavity, the second cavity, the fourth cavity, and the third cavity in sequence from the air inlet hole inwards.

[0012] As a further description of the above technical solution:

[0013] The limiting column is eccentrically arranged on the disc, and a stop block is provided on the limiting column.

[0014] As a further description of the above technical solution:

[0015] Four groups of diaphragm pump balls are provided, two groups of diaphragm pump balls are respectively in fit with both ends of the second cavity, and two groups of diaphragm pump balls are respectively in fit with both ends of the fourth cavity.

[0016] As a further description of the above technical solution:

[0017] The air inlet hole is concentric with the cavity of the central column, the first housing and the second housing are respectively located at both ends of the valve body housing, and the sealing gasket is made of rubber material.

[0018] The utility model has the following beneficial effects:

[0019] 1. In the utility model, by controlling the reciprocating motion of the connecting rod by the motor, the position of the adjusting plug in the air inlet hole and the central column is controlled, so as to control the entry space of the compressed air in the valve body housing. Cooperating with the diaphragms at both ends of the sliding connecting plate to alternately form positive pressure and negative pressure in the first cavity, the second cavity, the third cavity, and the fourth cavity in the valve body housing, so as to continuously pump water from the liquid suction port into the valve body housing and discharge it from the liquid outlet port. The two sides pump water in sections, which can provide continuous and stable fluid flow and reduce the pressure fluctuation of the pump body.

[0020] 2. In the utility model, due to the reciprocating motion of the diaphragm, there is no dead zone in the diaphragm pump, which can reduce the growth of bacteria and fluid retention. At the same time, there are fewer moving parts. The first housing and the second housing are connected by threads, which is convenient for the staff to disassemble and replace in the future, greatly increasing the service life of the utility model. Description of the Drawings

[0021] Figure 1Schematic three-dimensional structure diagram of a pneumatic diaphragm pump proposed by the present utility model;

[0022] Figure 2 Cross-sectional view of a pneumatic diaphragm pump proposed by the present utility model;

[0023] Figure 3 Partial cross-sectional view of a pneumatic diaphragm pump proposed by the present utility model;

[0024] Figure 4 Exploded view of the partial structure of a pneumatic diaphragm pump proposed by the present utility model;

[0025] Figure 5 is Figure 1 Enlarged view of part A of

[0026] Legend:

[0027] 1. Valve body housing; 2. Diaphragm housing; 3. Air inlet hole; 4. Fixed plate; 5. Motor; 6. Disc; 7. Limit post; 8. Limit groove; 9. Connecting rod; 10. Guide block; 11. Liquid outlet; 12. Liquid suction port; 13. First housing; 14. Second housing; 15. First cavity; 16. Second cavity; 17. Third cavity; 18. Fourth cavity; 19. Sliding connection plate; 20. Adjusting plug; 21. Sealing gasket; 22. Blocking piece; 23. Central column; 24. Diaphragm pump ball. Specific implementation manners

[0028] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0029] Referring to Figures 1-5 , an embodiment provided by the present utility model: A pneumatic diaphragm pump includes a valve body housing 1, diaphragm housings 2 are respectively provided on both sides of the valve body housing 1, an air inlet hole 3 is provided on the diaphragm housing 2, a first housing 13 is threadedly connected to the valve body housing 1, a liquid outlet 11 is provided on the first housing 13, a second housing 14 is threadedly connected to the valve body housing 1, a liquid suction port 12 is provided on the second housing 14, a central column 23 is fixedly connected inside the valve body housing 1, a sliding connection plate 19 is slidably connected to the central column 23, a first cavity 15 is provided inside the valve body housing 1, a second cavity 16 is provided inside the valve body housing 1, a third cavity 17 is provided inside the valve body housing 1, a fourth cavity 18 is provided inside the valve body housing 1, a blocking piece 22 is fixedly connected inside the central column 23, and a diaphragm pump ball 24 is provided inside the valve body housing 1.

[0030] A fixing plate 4 is fixedly connected to the diaphragm housing 2, a motor 5 is fixedly connected to the fixing plate 4, a disc 6 is fixedly connected to the output end of the motor 5, a limiting column 7 is fixedly connected to the disc 6, a limiting groove 8 is slidably connected to the limiting column 7, a connecting rod 9 is fixedly connected to the limiting groove 8, one end of the connecting rod 9 is fixedly connected to an adjusting plug 20, a guiding block 10 is fixedly connected to the air inlet hole 3, the connecting rod 9 slidably penetrates through the guiding block 10, a through hole is provided in the adjusting plug 20, a sealing gasket 21 is fixedly connected to one end of the adjusting plug 20, a plurality of groups of through holes are provided in the blocking piece 22, the through holes in the sealing gasket 21 are in fit with the through holes in the blocking piece 22, the adjusting plug 20 respectively slides in the air inlet hole 3 and the central column 23, diaphragms are respectively provided at both ends of the sliding connecting plate 19, the two diaphragms are respectively fixedly connected in the diaphragm housing 2, the two diaphragms divide the valve body housing 1 into four parts, which are successively the first cavity 15, the second cavity 16, the fourth cavity 18, and the third cavity 17 from the air inlet hole 3 inwards, the limiting column 7 is eccentrically arranged on the disc 6, a stop block is provided on the limiting column 7, four groups of diaphragm pump balls 24 are provided, the two groups of diaphragm pump balls 24 are respectively in fit with both ends of the second cavity 16, the two groups of diaphragm pump balls 24 are respectively in fit with both ends of the fourth cavity 18, the air inlet hole 3 is concentric with the cavity of the central column 23, the first housing 13 and the second housing 14 are respectively located at both ends of the valve body housing 1, and the material of the sealing gasket 21 is a rubber material.

[0031] Working principle: When in use, the operator connects the liquid outlet 11 and the liquid suction port 12 to the pipeline respectively, connects the compressed air interface to the air inlet hole 3, and then starts the motor 5 to drive the rotating disc 6 to rotate, driving the limit post 7 to rotate eccentrically, thereby pulling the limit groove 8. Under the restriction of the guide block 10 through the limit groove 8, the connecting rod 9 is driven to move horizontally in the air inlet hole 3 and the central column 23. When the connecting rod 9 is displaced to the farthest position in the air inlet hole 3, the sealing gasket 21 fits with several groups of through holes on the blocking piece 22, and the air entering from the air inlet hole 3 can only enter the first cavity 15. The diaphragm on one side of the first cavity 15 is pressed towards the second cavity 16 by the air pressure, thereby squeezing out the diaphragm pump ball 24 at the upper end of the second cavity 16 to form a passage. At the same time, the diaphragm pump ball 24 below the second cavity 16 is squeezed into the second housing 14 to seal the liquid suction port 12 side. At the same time, the sliding connecting plate 19 is pushed on the central column 23 by the air pressure in the first cavity 15, thereby forming a negative pressure inside the fourth cavity 18, squeezing the diaphragm pump ball 24 above the fourth cavity 18, and closing the upper part of the fourth cavity 18. Since the inside of the fourth cavity 18 is in negative pressure, the diaphragm pump ball 24 below is squeezed and moves upward to open the liquid suction port 12 side to form a passage, and the liquid is squeezed from the liquid suction port 12 into the lower part of the fourth cavity 18. When the limit post 7 drives the connecting rod 9 to move to the closest distance from the air inlet hole 3, the adjusting plug 20 is pulled between the central column 23 and the air inlet hole 3, and the sealing gasket 21 no longer fits with the blocking piece 22. At this time, the gas cannot enter the first cavity 15 and can only enter the third cavity 17 through the through holes inside the adjusting plug 20 and then cooperate with several through holes on the blocking piece 22. By squeezing the diaphragm on one side of the third cavity 17, the sliding connecting plate 19 is pushed to slide. At this time, the third cavity 17 expands and the air in the fourth cavity 18 is squeezed. The diaphragm pump ball 24 at the upper end of the fourth cavity 18 moves upward to open the passage of the liquid outlet 11. At the same time, the diaphragm pump ball 24 below the fourth cavity 18 seals the liquid suction port 12 by extrusion. The liquid below the fourth cavity 18 can be discharged through the liquid outlet 11 due to extrusion. At the same time, due to the sliding of the sliding connecting plate 19, a negative pressure is formed inside the second cavity 16, pressing the upper diaphragm pump ball 24 downward to block the liquid outlet 11 side. Due to the negative pressure below the second cavity 16, the diaphragm pump ball 24 is squeezed upward to cooperate with the liquid suction port 12 to pump the liquid into the lower part of the second cavity 16. Repeating the above actions, the motor 5 drives the adjusting plug 20 to reciprocate to cooperate with the external compressed air to change the air pressure in different spaces inside the valve body housing 1, thereby achieving the effect of segmented pumping on both sides. Segmented pumping on both sides can provide continuous and stable fluid flow, reduce pressure fluctuations. Due to the reciprocating movement of the diaphragm, the diaphragm pump has no dead zone, which can reduce bacterial growth and fluid retention. The threaded design of the first housing 13 and the second housing 14 is convenient for the operator to disassemble and maintain and repair the internal components.

[0032] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A pneumatic diaphragm pump, comprising a valve body housing (1), characterized in that: On both sides of the valve body housing (1), diaphragm housings (2) are respectively provided. An air inlet hole (3) is provided on the diaphragm housing (2). A first housing (13) is threadedly connected to the valve body housing (1). A liquid outlet (11) is provided on the first housing (13). A second housing (14) is threadedly connected to the valve body housing (1). A liquid suction port (12) is provided on the second housing (14). A central column (23) is fixedly connected inside the valve body housing (1). A sliding connection plate (19) is slidably connected to the central column (23). A first cavity (15) is provided inside the valve body housing (1). A second cavity (16) is provided inside the valve body housing (1). A third cavity (17) is provided inside the valve body housing (1). A fourth cavity (18) is provided inside the valve body housing (1). A blocking piece (22) is fixedly connected inside the central column (23). A diaphragm pump ball (24) is provided inside the valve body housing (1).

2. The pneumatic diaphragm pump according to claim 1, characterized in that: A fixing plate (4) is fixedly connected to the diaphragm housing (2). A motor (5) is fixedly connected to the fixing plate (4). A disc (6) is fixedly connected to the output end of the motor (5). A limiting column (7) is fixedly connected to the disc (6). A limiting groove (8) is slidably connected to the limiting column (7). A connecting rod (9) is fixedly connected to the limiting groove (8). One end of the connecting rod (9) is fixedly connected to an adjusting plug (20). A guiding block (10) is fixedly connected to the air inlet hole (3). The connecting rod (9) slidably penetrates through the guiding block (10).

3. The pneumatic diaphragm pump according to claim 2, characterized in that: A through hole is provided inside the adjusting plug (20). A sealing pad (21) is fixedly connected to one end of the adjusting plug (20). A number of groups of through holes are provided on the blocking piece (22). The sealing pad (21) is in contact with the through holes on the blocking piece (22). The adjusting plug (20) slides inside the air inlet hole (3) and the central column (23) respectively.

4. The pneumatic diaphragm pump according to claim 3, characterized in that: Diaphragms are respectively provided at both ends of the sliding connection plate (19). The two diaphragms are respectively fixedly connected inside the diaphragm housing (2). The two diaphragms divide the inside of the valve body housing (1) into four parts. From the air inlet hole (3) inward, they are the first cavity (15), the second cavity (16), the fourth cavity (18), and the third cavity (17).

5. The pneumatic diaphragm pump according to claim 4, characterized in that: The limiting column (7) is eccentrically arranged on the disc (6). A stop block is provided on the limiting column (7).

6. The pneumatic diaphragm pump according to claim 5, characterized in that: Four groups of diaphragm pump balls (24) are provided. Two groups of diaphragm pump balls (24) are respectively in contact with both ends of the second cavity (16). Two groups of diaphragm pump balls (24) are respectively in contact with both ends of the fourth cavity (18).

7. The pneumatic diaphragm pump according to claim 6, wherein: The air inlet hole (3) is concentric with the cavity of the central column (23). The first housing (13) and the second housing (14) are respectively located at both ends of the valve body housing (1). The material of the sealing pad (21) is a rubber material.

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