Diaphragm pump structure

Abstract

The utility model discloses a diaphragm pump structure, a pump body is provided with a medium flow cavity, and the medium flow cavity comprises an inlet, an outlet and a diaphragm cavity; the cover plate and the pump body are matched and sealed to form a diaphragm cavity; the diaphragm piece is located in the diaphragm cavity and fixed through clamping and sealing of the pump body and the cover plate. The stainless steel sheet comprises an outer ring and an inner membrane chamber which are oppositely and separately arranged; according to the diaphragm pump, the stainless steel sheet forming the diaphragm chamber is improved and is arranged in a split mode, machining and production of the diaphragm pump are facilitated, a fine fit clearance exists between the annular edge of the diaphragm pump and the diaphragm sheet, a certain movement space exists between the diaphragm sheet and the diaphragm sheet in the continuous movement process of expansion and contraction of the diaphragm sheet, clamping force between the diaphragm sheet and the diaphragm sheet is reduced, abrasion is small, and the service life of the diaphragm pump is prolonged. The abrasion of the edge of the diaphragm is small, the diaphragm is not easy to damage, and the service life of the diaphragm is prolonged.

Description

Technical Field

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

[0002] The working principle of a diaphragm pump is to rely on the expansion and contraction of the diaphragm to drive the movement of the fluid, thereby achieving flow control. The diaphragm pump mainly uses a transmission part (such as mechanical transmission, hydraulic transmission, or pneumatic transmission) to drive the diaphragm back and forth, changing the working chamber volume to draw in and discharge liquid. In this process, the diaphragm consumes the most. During the continuous expansion and contraction process, not only will the material fatigue be affected, but the edges of the diaphragm clamped by the shell will also rub against each other during the continuous movement of the diaphragm, causing wear and tear, which may exacerbate the problem of diaphragm damage. Utility Model Content

[0003] In view of the prior art, the purpose of the present invention is to provide a diaphragm pump structure that is easy to process and has a longer service life.

[0004] In order to achieve the above objectives, the technical solution adopted by the utility model is: a diaphragm pump structure, including a pump body, a medium flow cavity is provided on the pump body, and the medium flow cavity includes an inlet, an outlet and a diaphragm cavity; a cover plate, the cover plate is used to cooperate with the pump body to seal and form a diaphragm cavity; a diaphragm sheet is arranged in the diaphragm cavity and is fixed by clamping and sealing the pump body and the cover plate; a stainless steel sheet, the stainless steel sheet includes an outer ring and an inner membrane chamber that are relatively separated.

[0005] As a further configuration of the above solution, the diaphragm sheet in contact with the edge of the inner membrane chamber is clamped and fixed by the pump body and the cover plate.

[0006] As a further arrangement of the above scheme, the outer ring diameter is larger than the maximum diameter of the inner membrane chamber, the diaphragm diameter is larger than the outer ring, and the outer ring is pressed by the cover plate to cooperate with the pump body to form a sealing clamp to fix the outer ring of the diaphragm.

[0007] As a further configuration of the above solution, the diaphragm separates the diaphragm cavity into a pressure cavity and a medium cavity, the pressure cavity is provided with a pressure hole, and the medium cavity is connected to the medium flow cavity.

[0008] As a further arrangement of the above scheme, a through hole is provided on the stainless steel sheet, and a positioning spring is also provided on the side opposite to the cover plate. Sealing grooves and O-rings are also provided at the places where the cover plate and the pump body clamp the stainless steel sheet and the diaphragm sheet. The sealing grooves and O-rings are mainly used to ensure the sealing of the pressure chamber of the medium chamber. One end of the positioning spring abuts against the back of the stainless steel sheet, and the other end abuts against the mounting rod used to install the stainless steel sheet and the diaphragm sheet, providing an elastic thrust for the inner membrane chamber.

[0009] As a further configuration of the above solution, one-way plugs are provided at the flow channel openings at the inlet and outlet of the medium flow cavity, and a second flow channel is provided at the pump body relative to the diaphragm cavity.

[0010] Beneficial effects: The diaphragm pump of the present invention improves the stainless steel sheet constituting the diaphragm chamber and sets it up in a split manner, which is not only convenient for its processing and production, but also allows a slight fitting gap to exist between its ring edge and the diaphragm. During the continuous expansion and contraction of the diaphragm, there is a certain amount of activity space between the two, which reduces the clamping force and wear of the two, and makes the wear at the edge of the diaphragm less prone to damage, thereby improving the service life of the diaphragm. The diaphragm valve of the present invention has better performance and continuous life than the existing technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the structure of the diaphragm pump of the utility model.

[0012] Figure 2 Schematic diagram of the internal structure of the diaphragm pump of this embodiment.

[0013] Figure 3 This is an enlarged schematic diagram of the cover plate and pump body clamping the stainless steel sheet and diaphragm sheet in this embodiment.

[0014] Figure 4 Schematic diagram of the stainless steel sheet of this embodiment.

[0015] Figure numerals: 1. Pump body; 10. Medium flow cavity; 11. Inlet; 12. Outlet; 13. Diaphragm cavity; 131. Pressure cavity; 132. Medium cavity; 133. Pressure hole; 15. Second flow channel; 19. One-way plug; 2. Cover plate; 21. Sealing groove; 22. O-ring; 3. Stainless steel sheet; 31. Outer ring; 32. Inner membrane chamber; 321. Ring edge; 33. Through hole; 34. Positioning spring; 4. Diaphragm. DETAILED DESCRIPTION

[0016] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features therein can be combined with each other without conflict.

[0017] like Figure 1-4 A diaphragm pump structure shown is characterized in that it includes a pump body 1, a medium flow cavity 10 is provided on the pump body 1, and the medium flow cavity 10 includes an inlet 11, an outlet 12 and a diaphragm cavity 13;

[0018] The cover plate 2 is used to cooperate with the pump body 1 to seal and form a diaphragm cavity 13;

[0019] The diaphragm 4 is located in the diaphragm cavity 13 and is fixed by clamping and sealing the pump body 1 and the cover plate 2;

[0020] The stainless steel sheet 3 includes an outer ring 31 and an inner membrane chamber 32 which are relatively separated.

[0021] As a further configuration of the above solution, the annular edge 321 of the inner membrane chamber 32 is in contact with the diaphragm 4 and is clamped and fixed by the pump body 1 and the cover plate 2 .

[0022] As a further arrangement of the above scheme, the diameter of the outer ring 31 is larger than the maximum diameter of the inner membrane chamber 32, and the diameter of the diaphragm 4 is larger than the outer ring 31. The outer ring 31 is pressurized by the cover plate 2 and cooperates with the pump body 1 to form a sealing clamping fixation for the outer ring of the diaphragm 4.

[0023] As a further configuration of the above solution, the diaphragm 4 divides the diaphragm cavity 13 into a pressure cavity 131 and a medium cavity 132 . The pressure cavity 131 is provided with a pressure hole 133 , and the medium cavity 132 is in communication with the medium flow cavity 10 .

[0024] As a further arrangement of the above scheme, a through hole 33 is provided on the stainless steel sheet 3, and a positioning spring 34 is also provided on the side opposite to the cover plate 2. A sealing groove 21 and an O-ring 22 are also provided at the place where the cover plate 2 and the pump body 1 clamp the stainless steel sheet 3 and the diaphragm sheet 4. The sealing groove 21 and the O-ring 22 are mainly used to ensure the sealing of the pressure chamber 131 of the medium chamber 132. One end of the positioning spring 34 abuts against the back of the stainless steel sheet 3, and the other end abuts against the mounting rod used to install the stainless steel sheet 3 and the diaphragm sheet 4, providing an elastic thrust for the inner membrane chamber 32.

[0025] As a further arrangement of the above scheme, the medium flow cavity 10 is provided with a one-way plug 19 and a spring (not shown in the figure, refer to the prior art) at the flow channel openings relative to the inlet 11 and the outlet 12, and the pump body 1 is provided with a second flow channel 15 relative to the diaphragm cavity 13.

[0026] As described above, the diaphragm pump structure of the present invention is set up. The main structure of the diaphragm pump of this embodiment includes a pump body 1 and a cover plate 2 and a diaphragm assembly arranged in a diaphragm cavity 13 formed by the cover plate 2 and the pump body 1. The diaphragm assembly includes a diaphragm sheet 4 and a stainless steel sheet 3 with an elastic member. The shape of the stainless steel sheet 3 also constitutes the structure of the diaphragm chamber. The elastic member is mainly to prevent its deformation, such as Figure 2As shown, a medium flow cavity 10 is provided in the pump body of this embodiment, and an inlet 11 and an outlet 12 are provided at both ends of the medium flow cavity 10. The medium flow cavity 10 is located between the two, and a second flow channel 15 is provided. The purpose of the second flow channel 15 is to reduce obstruction, expand the flow path and improve circulation efficiency. Under the drive of external power, pressure enters the pressure cavity 131 from the pressure hole 133, acts on the diaphragm 4 through the through hole 33, so that the diaphragm 4 expands toward the medium flow cavity 10, and the one-way plug 19 switches. The medium is pressed out of the medium flow cavity 10 from the outlet 12, and then the pressure is drawn out of the pressure cavity 131 from the pressure hole 133. The diaphragm 4 rebounds and contracts in the opposite direction, and a negative pressure is formed in the medium flow cavity 10. The one-way plug 19 on the outlet 12 side blocks the outlet 12, and the inlet 11 side is opened. The medium flows from the inlet 11 to fill the medium flow cavity 10, and the diaphragm pump works reciprocatingly.

[0027] It is worth noting that the stainless steel sheet 3 of this embodiment is configured as an outer ring 31 and an inner membrane chamber 32. The inner membrane chamber 32 is configured to have its outward protruding size according to the elastic properties of the diaphragm sheet 4. The inner membrane chamber 32 is provided with several through holes 33 that cooperate with the pressure holes 133 to connect to an external power component, such as a liquid cylinder. Furthermore, based on the above arrangement, the cover plate 2 and the pump body 1 of this embodiment will simultaneously clamp the diaphragm 4 and the stainless steel sheet 3 when they are fixed with bolts. Compared with the conventional setting technology, this structure generally clamps the two together for installation, which results in the diaphragm 4 and the stainless steel sheet 3 being relatively tightly sealed, which makes the edges of the horizontal sections of the two completely fit together. After installation, the flat rings of the edge portions of the two are clamped and sealed by the cover plate 2 and the pump body 1, and the stainless steel sheet 3 is subjected to the pressure of the cover plate 2 and contacts with the pump body 1 to clamp the diaphragm 4, which also results in the diaphragm 4 being driven by the power component. During the continuous expansion and contraction process, the diaphragm 4 continuously moves relative to the stainless steel sheet 3, which is prone to damage at the contact edge of the diaphragm 4 and the stainless steel sheet 3 after long-term use. The embodiment of the utility model is through The stainless steel sheet 3 is improved by splitting it into an outer ring 31 and an inner membrane chamber 32. Compared with the existing technical structure, this embodiment only fastens and clamps the diaphragm 4 through the outer ring 31, and the horizontal section of the inner membrane chamber 32 is also provided with a rounded corner structure. Based on the fastening and clamping setting of the outer ring 31, after achieving the sealing effect, the clamping force between the inner membrane chamber 32 and the diaphragm 4 is set slightly smaller. In this way, when the diaphragm 4 is under pressure and continuously bounces back and forth, the rounded corners of the inner membrane chamber 32 fit with the diaphragm 4, reducing the damage of the sharp angle to the diaphragm 4, and the diaphragm 4 has a certain amount of activity space relative to the inner membrane chamber 32 when it expands and contracts, thereby reducing the mutual wear between the two and improving the service life of the diaphragm 4. In addition, the split outer ring 31 and inner membrane chamber 32 are also relatively more convenient for production and processing, and are convenient for production and assembly.

[0028] Obviously, those skilled in the art may make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.

Claims

1. A diaphragm pump structure, characterized in that: include A pump body (1) is provided with a medium flow cavity (10), wherein the medium flow cavity (10) includes an inlet (11), an outlet (12) and a diaphragm cavity (13); A cover plate (2), the cover plate (2) is used to cooperate with the pump body (1) to seal and form a diaphragm cavity (13); The diaphragm (4) is located in the diaphragm cavity (13) and is fixed by clamping and sealing the pump body (1) and the cover plate (2); The stainless steel sheet (3) comprises an outer ring (31) and an inner membrane chamber (32) which are relatively separated.

2. A diaphragm pump structure according to claim 1, characterized in that: The annular edge (321) of the inner membrane chamber (32) is in contact with the diaphragm (4) and is clamped and fixed by the pump body (1) and the cover plate (2).

3. A diaphragm pump structure according to claim 1, characterized in that: The diameter of the outer ring (31) is larger than the maximum diameter of the inner membrane chamber (32), and the diameter of the diaphragm (4) is larger than the outer ring (31). The outer ring (31) is pressed by the cover plate (2) to cooperate with the pump body (1) to form a sealing clamping fixation on the outer ring of the diaphragm (4).

4. A diaphragm pump structure according to claim 1, characterized in that: The diaphragm (4) separates the diaphragm cavity (13) into a pressure cavity (131) and a medium cavity (132); the pressure cavity (131) is provided with a pressure hole (133); and the medium cavity (132) is connected to the medium flow cavity (10).

5. The diaphragm pump structure according to claim 1, characterized in that: The stainless steel sheet (3) is provided with a through hole (33), and a positioning spring (34) is also provided on the side thereof opposite to the cover plate (2). The cover plate (2) and the pump body (1) are provided with a sealing groove (21) and an O-type gasket (22) at the location where the stainless steel sheet (3) and the diaphragm sheet (4) are clamped.

6. A diaphragm pump structure according to claim 1, characterized in that: The medium flow cavity (10) is provided with a one-way plug (19) at the flow channel opening relative to the inlet (11) and the outlet (12), and the pump body (1) is provided with a second flow channel (15) relative to the diaphragm cavity (13).

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