Diaphragm pump check valve

Abstract

This utility model discloses a one-way valve for a diaphragm pump, belonging to the field of diaphragm pumps. It includes a valve seat, a valve plate, and a valve plate spring. The valve seat has a valve hole that connects the inlet and outlet ends of the valve seat. The valve plate is located within the valve hole. One end of the valve plate spring is mounted on the valve plate, and the other end is mounted on the spring mounting structure of the diaphragm pump. The valve plate and valve seat are made of hard plastic. The valve plate has a first arc-shaped surface facing the inlet end, and this first arc-shaped surface blocks and seals the valve hole under the elastic force of the valve plate spring. The valve plate and valve seat of this utility model are made of hard plastic. Using a hard valve plate and valve seat prevents damage from fine solid particles and impurities, and prevents adhesion even after prolonged periods of disuse, ensuring reliable operation of the one-way valve.

Description

Technical Field

[0001] This utility model relates to the field of diaphragm pumps, and in particular to a one-way valve for diaphragm pumps. Background Technology

[0002] Diaphragm pumps rely on the back-and-forth movement of the diaphragm to change the volume of the working chamber in order to draw in and discharge liquid. The check valve is an important component of the diaphragm pump, which restricts the liquid from flowing from the inlet side to the outlet side.

[0003] Existing diaphragm pump check valves typically achieve unidirectional liquid flow through flexible valve plates, which has the following drawbacks:

[0004] 1. When there are fine solid particles in the liquid, they can easily damage the flexible valve plate. Furthermore, the solid particles can easily be trapped inside the flexible valve plate, resulting in a decrease in the sealing effect of the flexible valve plate.

[0005] 2. If the flexible valve plate is not used for a long time after contacting the liquid, it is easy for the flexible valve plate to stick to the structure it is in contact with. When it is used again, it may not be able to be separated, causing the check valve to fail to work. Utility Model Content

[0006] To solve the above-mentioned technical problems, this utility model provides a diaphragm pump check valve, which ensures the reliable operation of the check valve.

[0007] The technical solution provided by this utility model is as follows:

[0008] A diaphragm pump check valve includes a valve seat, a valve plate, and a valve plate spring, wherein:

[0009] The valve seat has a valve hole that passes through the inlet and outlet of the valve seat. The valve plate is located in the valve hole. One end of the valve plate spring is mounted on the valve plate, and the other end is mounted on the spring mounting structure of the diaphragm pump.

[0010] The valve plate and valve seat are made of hard plastic. The valve plate has a first arc-shaped surface facing the water inlet end. The first arc-shaped surface of the valve plate blocks and seals the valve hole under the elastic force of the valve plate spring.

[0011] Furthermore, the valve orifice has a stepped structure, such that the diameter of the valve orifice near the water inlet is smaller than the diameter of the valve orifice near the water outlet.

[0012] The valve plate is located in the valve hole near the water outlet end, and the first arc-shaped surface of the valve plate faces the stepped structure. The first arc-shaped surface is sealed and pressed against the stepped structure under the elastic force of the valve plate spring.

[0013] Furthermore, the stepped structure has a second arcuate surface that mates with the first arcuate surface, and the first arcuate surface is sealed and pressed against the second arcuate surface under the elastic force of the valve spring.

[0014] Furthermore, the first and second arc-shaped surfaces are spherical.

[0015] Furthermore, the valve hole is provided with a plurality of inwardly protruding guide ribs, the length direction of which is arranged along the axial direction of the valve hole.

[0016] Furthermore, the valve plate includes a guide post structure, one end face of which is arc-shaped, forming the first arc-shaped surface.

[0017] Furthermore, the outer side of the guide post structure cooperates with the guide ribs for guidance, and the space between two adjacent guide ribs and the outer side of the guide post structure serves as a water passage gap.

[0018] Furthermore, the guide post structure is provided with a mounting post structure, the outer diameter of which is smaller than the outer diameter of the guide post structure. One end of the valve plate spring is sleeved on the mounting post structure, and the other end is mounted on the spring mounting structure of the diaphragm pump.

[0019] Furthermore, when the diaphragm pump check valve is used as an inlet check valve, the inlet end of the diaphragm pump check valve faces the inlet chamber of the diaphragm pump, and the outlet end faces the working chamber of the diaphragm pump.

[0020] When the diaphragm pump check valve is used as an outlet check valve, the inlet end of the diaphragm pump check valve faces the working chamber side of the diaphragm pump, and the outlet end faces the outlet chamber side of the diaphragm pump.

[0021] Furthermore, the valve seats of the inlet check valve and the outlet check valve are either integral or separate structures.

[0022] This utility model has the following beneficial effects:

[0023] The valve plate and valve seat of this utility model are made of hard plastic. By using hard valve plates and valve seats, the valve plate will not be damaged by fine solid particles and impurities, and there will be no sticking even if it is not used for a long time, thus ensuring the reliable operation of the one-way valve. Attached Figure Description

[0024] Figure 1 An exploded view of a diaphragm pump having the check valve of this invention.

[0025] Figure 2 A cross-sectional view of a diaphragm pump having the diaphragm pump check valve of this utility model;

[0026] Figure 3 A schematic diagram of a valve seat with an integral structure;

[0027] Figure 4 This is a schematic diagram of a valve seat with a split structure;

[0028] Figure 5 This is a sectional view of the valve seat;

[0029] Figure 6 This is a schematic diagram of the valve plate;

[0030] Figure 7 This is a cross-sectional view of the valve plate. Detailed Implementation

[0031] To make the technical problems, technical solutions and advantages of this utility model clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0032] This utility model embodiment provides a diaphragm pump check valve 100, such as Figure 1-7 As shown, it includes a valve seat 1, a valve plate 2, and a valve plate spring 3, wherein:

[0033] The valve seat 1 has a valve hole 6 that passes through the inlet end 4 and the outlet end 5 of the valve seat 1, serving as a channel for water inlet or outlet. The valve plate 2 is located inside the valve hole 6. One end of the valve plate spring 3 is mounted on the valve plate 2, and the other end is mounted on the spring mounting structure 7 of the diaphragm pump 200. The spring mounting structure 7 can be a cylindrical structure set at a corresponding position inside the diaphragm pump, and the valve plate spring 3 is fitted onto this cylindrical structure.

[0034] The valve plate 2 and valve seat 1 are made of hard plastic. The valve plate 2 has a first arc-shaped surface 8 facing the water inlet end 4. The first arc-shaped surface 8 can be part of a sphere or other curved surfaces. The first arc-shaped surface 8 of the valve plate 2 blocks and seals the valve hole 6 under the elastic force of the valve plate spring 3. When the pressure difference between the water inlet end and the water outlet end reaches a level that overcomes the elastic force of the valve plate spring, the valve plate opens, and the valve hole is open. This achieves unidirectional flow from the water inlet end to the water outlet end. When the pressure difference between the water inlet end and the water outlet end decreases to a level that cannot overcome the elastic force of the valve plate spring, the valve plate returns to its original position under the elastic force of the valve plate spring, and the valve hole closes.

[0035] The valve plate and valve seat of this utility model are made of hard plastic. By using hard valve plates and valve seats, the valve plate will not be damaged by fine solid particles and impurities, and there will be no sticking even if it is not used for a long time, thus ensuring the reliable operation of the one-way valve.

[0036] The hard plastic described in this invention is any plastic with a certain degree of hardness, not necessarily an extremely hard plastic. Various hard engineering materials can meet the requirements; for example, POM engineering plastic, which has excellent self-lubricating properties and provides good sealing when in spherical contact.

[0037] To ensure reliable sealing and unobstructed flow of the one-way valve, the valve hole 6 has a stepped structure 9, such that the diameter of the valve hole 6 near the inlet end 4 is smaller than the diameter of the valve hole 6 near the outlet end 5.

[0038] The valve plate 2 is located in the valve hole 6 on the side near the water outlet 5. The first arc-shaped surface 8 of the valve plate 2 faces the stepped structure 9. The first arc-shaped surface 8 is sealed and pressed against the stepped structure 9 under the elastic force of the valve plate spring 3.

[0039] The stepped structure 9 has a second arc-shaped surface 10 that mates with the first arc-shaped surface 8. The first arc-shaped surface 8 is pressed and sealed against the second arc-shaped surface 10 under the elastic force of the valve spring 3. The first arc-shaped surface 8 and the second arc-shaped surface 10 can be spherical or other curved surfaces, as long as they can fit together and seal.

[0040] As an improvement of this utility model embodiment, a plurality of inwardly protruding guide ribs 11 are provided inside the valve hole 6, and the length direction of the guide ribs 11 is arranged along the axial direction of the valve hole 6.

[0041] The valve plate 2 includes a guide post structure 12, one end face of which is arc-shaped, forming a first arc-shaped surface 8.

[0042] The outer side of the guide post structure 12 of the valve plate 2 cooperates with the guide rib 11 to guide the valve plate to move vertically without tilting or shifting, and to reliably seal and open the valve orifice.

[0043] The space between two adjacent guide ribs 11 and the outer side of the guide column structure 12 serves as a water passage gap. When the valve plate is opened, this water passage gap is used for water passage.

[0044] To facilitate the installation of the valve spring 3, a mounting post structure 13 is provided on the guide post structure 12. The outer diameter of the mounting post structure 13 is smaller than the outer diameter of the guide post structure 12. One end of the valve spring 3 is fitted onto the mounting post structure 13, and the other end is installed on the spring mounting structure 7 of the diaphragm pump 200.

[0045] To reduce the weight and material usage of the valve plate, the guide post structure 12 can be hollow, forming a ring structure. One end of the ring is a spherical shell structure, forming a first arc-shaped surface 8, and the other end is an open shell structure. The mounting post structure 13 is also a hollow structure, located inside the shell structure of the guide post structure 12. The end of the mounting post structure 13 facing the first arc-shaped surface 8 is open, making the first arc-shaped surface 8 a centrally controlled annular spherical structure.

[0046] This utility model's diaphragm pump check valve can function as either an inlet check valve or an outlet check valve for a diaphragm pump. Specifically:

[0047] When the diaphragm pump check valve 100 is used as the inlet check valve 300, the inlet end 4 of the diaphragm pump check valve 100 faces the inlet chamber 14 of the diaphragm pump 200, and the outlet end 5 faces the working chamber 15 of the diaphragm pump 200, so as to realize the one-way flow from the inlet chamber 14 to the working chamber 15.

[0048] When the diaphragm pump check valve 100 is used as the outlet check valve 400, the inlet end 4 of the diaphragm pump check valve 100 faces the working chamber 15 of the diaphragm pump 200, and the outlet end 5 faces the outlet chamber 16 of the diaphragm pump 200, so as to realize the one-way flow from the working chamber 15 to the outlet chamber 16.

[0049] The valve seats of the inlet check valve 300 and the outlet check valve 400 can be of an integral structure, with both valve seats molded as a single piece for easy assembly. Alternatively, they can be of a separate structure for greater flexibility.

[0050] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A one-way valve for a diaphragm pump, characterized in that, Includes valve seat, valve plate, and valve plate spring, wherein: The valve seat has a valve hole that passes through the inlet and outlet of the valve seat. The valve plate is located in the valve hole. One end of the valve plate spring is mounted on the valve plate, and the other end is mounted on the spring mounting structure of the diaphragm pump. The valve plate and valve seat are made of hard plastic. The valve plate has a first arc-shaped surface facing the water inlet end. The first arc-shaped surface of the valve plate blocks and seals the valve hole under the elastic force of the valve plate spring.

2. The diaphragm pump check valve according to claim 1, characterized in that, The valve orifice has a stepped structure, such that the diameter of the valve orifice near the water inlet is smaller than the diameter of the valve orifice near the water outlet. The valve plate is located in the valve hole near the water outlet end, and the first arc-shaped surface of the valve plate faces the stepped structure. The first arc-shaped surface is sealed and pressed against the stepped structure under the elastic force of the valve plate spring.

3. The diaphragm pump check valve according to claim 2, characterized in that, The stepped structure has a second arc-shaped surface that matches the first arc-shaped surface, and the first arc-shaped surface is sealed and pressed against the second arc-shaped surface under the elastic force of the valve plate spring.

4. The diaphragm pump check valve according to claim 3, characterized in that, The first and second arc-shaped surfaces are spherical.

5. The diaphragm pump check valve according to any one of claims 1-4, characterized in that, The valve hole is provided with a plurality of inwardly protruding guide ribs, the length direction of which is arranged along the axial direction of the valve hole.

6. The diaphragm pump check valve according to claim 5, characterized in that, The valve plate includes a guide post structure, one end face of which is arc-shaped, forming the first arc-shaped surface.

7. The diaphragm pump check valve according to claim 6, characterized in that, The outer side of the guide post structure cooperates with the guide ribs for guidance, and the space between two adjacent guide ribs and the outer side of the guide post structure serves as a water passage gap.

8. The diaphragm pump check valve according to claim 6, characterized in that, The guide post structure is provided with a mounting post structure. The outer diameter of the mounting post structure is smaller than the outer diameter of the guide post structure. One end of the valve plate spring is sleeved on the mounting post structure, and the other end is mounted on the spring mounting structure of the diaphragm pump.

9. The diaphragm pump check valve according to claim 1, characterized in that, When the diaphragm pump check valve is used as an inlet check valve, the inlet end of the diaphragm pump check valve faces the inlet chamber of the diaphragm pump, and the outlet end faces the working chamber of the diaphragm pump. When the diaphragm pump check valve is used as an outlet check valve, the inlet end of the diaphragm pump check valve faces the working chamber side of the diaphragm pump, and the outlet end faces the outlet chamber side of the diaphragm pump.

10. The diaphragm pump check valve according to claim 9, characterized in that, The valve seats of the inlet check valve and the outlet check valve are either integral or separate structures.

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