Pump body sealing structure

Abstract

The utility model provides a pump body sealing structure, and belongs to the technical field of diaphragm pumps. The pump body sealing structure comprises a pump body and an end cover, a sealing ring is arranged at the attaching position of the pump body and the end cover, a buffering cavity is formed in the attaching position of the pump body and the end cover, an elastic buffering ring is arranged in the buffering cavity, and the buffering ring is located on the inner side of the sealing ring. According to the diaphragm pump, the buffer ring is arranged on the inner side of the sealing ring, the influence of high-frequency pressure impact generated when the diaphragm pump works on the sealing ring can be relieved through the elasticity of the buffer ring, the working environment of the sealing ring is improved, and the service life of the sealing ring is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of diaphragm pumps, and in particular to a pump body sealing structure. Background Art

[0002] The substance contained in the diaphragm pump is fluid, and the fluid is sucked in and discharged by changing the volume of the working chamber by the back and forth agitation of a diaphragm. Therefore, the sealing and waterproof properties of the diaphragm pump are particularly important.

[0003] In this regard, China's patent application number CN201520977580.X discloses a leak-proof pump head for a diaphragm pump. This solution widens the fitting surface, so that the contact portion between the two annular sealing grooves is equivalent to an additional circle of water sealing. At the same time, the extra sealing ring also increases the contact area, making the seal tighter.

[0004] However, in the process of implementing the technical solution in the embodiments of the present application, the inventor of the present application found that the above technology has at least the following technical problems:

[0005] Due to the working characteristics of the diaphragm pump, the sealing structure of the diaphragm pump is subjected to high-frequency pressure shocks. The sealing ring closest to the inside is frequently compressed and expanded under the high-frequency pressure shocks, and its life is greatly reduced. Simply adding a circle of seal cannot change the working environment of the inner sealing ring, and the sealing life is still low. Utility Model Content

[0006] In order to make up for the above deficiencies, the present application provides a pump body sealing structure, aiming to improve the problems mentioned in the above background technology.

[0007] An embodiment of the present application provides a pump body sealing structure, including a pump body and an end cover, a sealing ring is arranged at the joint between the pump body and the end cover, a buffer cavity is opened at the joint between the pump body and the end cover, an elastic buffer ring is arranged in the buffer cavity, and the buffer ring is located on the inner side of the sealing ring.

[0008] In a specific embodiment, the end cover is flange-connected to the pump body.

[0009] In the above implementation process, the flange connection can increase the connection strength between the end cover and the pump body and also has good sealing properties.

[0010] In a specific embodiment, the fitting parts of the end cover and the pump body are respectively an outer end surface, a circumferential surface and an inner end surface from the outside to the inside.

[0011] In the above implementation process, the circumferential surface, the outer end surface and the inner end surface form a bent fitting surface, which creates a positioning effect and ensures the accurate fitting of the end cover and the pump body.

[0012] In a specific implementation manner, the outer end surface is a fitting surface of the flange, and the buffer cavity is provided on the inner end surface.

[0013] In the above implementation process, the buffer cavity is opened on the innermost fitting surface to withstand the internal pressure impact of the pump body when it is working and protect the sealing ring at the back.

[0014] In a specific implementation manner, an annular groove matched with the sealing ring is formed on the circumferential surface of the end cover, and the sealing ring is embedded in the annular groove.

[0015] In a specific implementation manner, two annular grooves are provided, and one sealing ring is respectively provided in each annular groove.

[0016] In the above implementation process, the two sealing rings play a major sealing role and are sleeved on the circumferential surface of the end cover. After the end cover is buckled on the pump body, they are squeezed with the circumferential surface of the pump body to form a seal.

[0017] In a specific embodiment, an arc guide angle is set at the junction of the outer end surface and the circumferential surface.

[0018] In the above implementation process, the setting of the arc guide angle makes it easier for the sealing ring to be smoothly inserted after the end cover is buckled on the pump body.

[0019] In a specific embodiment, a protective pad is provided on the outer end surface.

[0020] In the above implementation process, the protective pad protects the sealing ring from the outside. The protective pad is used to block external gas, dust or other fluids that affect the life of the sealing ring, provide the sealing ring with a good working environment, and help extend the service life of the sealing ring. In this embodiment, the protective pad is made of polytetrafluoroethylene.

[0021] Compared with the prior art, the beneficial effect of the present application is that a buffer ring is arranged on the inner side of the sealing ring, which utilizes its own elasticity to alleviate the impact of the high-frequency pressure shock generated when the diaphragm pump is working on the sealing ring, improve the working environment of the sealing ring, and extend the service life of the sealing ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the implementation methods of the present application, the drawings required for use in the implementation methods will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1It is a schematic diagram of the pump body sealing structure provided in the embodiment of the present application;

[0024] Figure 2 A schematic diagram of the connection relationship between the pump body and the end cover provided in the embodiment of the present application;

[0025] Figure 3 Provided for the implementation of this application Figure 1 A partial enlarged schematic diagram in the middle.

[0026] In the figure: 10 - pump body; 20 - end cover; 30 - sealing ring; 40 - buffer ring; 50 - outer end surface; 60 - circumferential surface; 70 - inner end surface; 80 - protective pad. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0028] See also Figure 1-Figure 3 The present application provides a pump body sealing structure, including a pump body 10 and an end cover 20, a sealing ring 30 is arranged at the joint of the pump body 10 and the end cover 20, a buffer cavity is opened at the joint of the pump body 10 and the end cover 20, an elastic buffer ring 40 is arranged in the buffer cavity, and the buffer ring 40 is located on the inner side of the sealing ring 30. The buffer ring 40 is arranged on the inner side of the sealing ring 30, and its own elasticity can alleviate the influence of the high-frequency pressure shock generated when the diaphragm pump is working on the sealing ring 30, improve the working environment of the sealing ring 30, and extend the service life of the sealing ring 30.

[0029] See also Figure 1-Figure 2 , the end cover 20 is flange-connected to the pump body 10. The flange connection can increase the connection strength between the end cover 20 and the pump body 10, and also has good sealing properties.

[0030] See also Figure 1-Figure 3 The fitting parts of the end cover 20 and the pump body 10 are respectively the outer end surface 50, the circumferential surface 60 and the inner end surface 70 from the outside to the inside. The circumferential surface 60, the outer end surface 50 and the inner end surface 70 form a bent fitting surface, forming a positioning effect, ensuring the accurate fitting of the end cover 20 and the pump body 10.

[0031] See also Figure 1-Figure 3 The outer end face 50 is the fitting surface of the flange, and the buffer cavity is opened on the inner end face 70. The buffer cavity is opened on the innermost fitting surface to withstand the internal pressure impact when the pump body 10 is working and protect the sealing ring 30 behind.

[0032] See also Figure 1-Figure 3The circumferential surface 60 of the end cover 20 is provided with an annular groove adapted to the sealing ring 30, and the sealing ring 30 is embedded in the annular groove. There are two annular grooves, and a sealing ring 30 is respectively arranged in each annular groove. The two sealing rings 30 play a major sealing role and are sleeved on the circumferential surface 60 of the end cover 20. After the end cover 20 is buckled on the pump body 10, they are squeezed with the circumferential surface 60 on the pump body 10 to form a seal.

[0033] See also Figure 1-Figure 3 The guide arc angle is set at the junction of the outer end surface 50 and the circumferential surface 60. The setting of the guide arc angle facilitates the smooth insertion of the sealing ring 30 after the end cover 20 is buckled on the pump body 10.

[0034] See also Figure 1-Figure 3 A protective pad 80 is provided on the outer end surface 50. The protective pad 80 protects the sealing ring 30 from the outside. The protective pad 80 is used to block external gas, dust or other fluids that affect the life of the sealing ring 30, and provide the sealing ring 30 with a good working environment, which is conducive to extending the service life of the sealing ring 30. In this embodiment, the protective pad 80 is made of polytetrafluoroethylene.

[0035] The working principle of the pump body sealing structure is: when the diaphragm pump is working, the pump body 10 generates high-frequency pressure shocks, and the impact force passes through the fitting gap between the end cover 20 and the pump body 10 and first enters the inner end surface 70. The buffer ring 40 is made of polyurethane material with a longer life than the sealing ring 30, and has good elasticity, which can alleviate the impact, protect the sealing ring 30 on the circumferential surface 60, and reduce the impact of pressure shocks on the sealing ring 30, thereby extending the service life of the sealing ring 30. The protective pad 80 is made of polytetrafluoroethylene and is squeezed between the end face and the flange of the pump body 10 to block external gas, dust or other fluids that affect the life of the sealing ring 30, provide the sealing ring 30 with a good working environment, and further extend the service life of the sealing ring 30. In summary, the buffer ring 40 is arranged on the inner side of the sealing ring 30, and its own elasticity can alleviate the impact of the high-frequency pressure shock generated when the diaphragm pump is working on the sealing ring 30, improve the working environment of the sealing ring 30, and extend the service life of the sealing ring 30.

[0036] The above are only embodiments of the present application and are not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, improvement or equivalent replacement made within the spirit and principle of the present application shall be included in the scope of protection of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

Claims

1. A pump body sealing structure, comprising a pump body (10) and an end cover (20), wherein a sealing ring (30) is provided at the joint between the pump body (10) and the end cover (20), characterized in that: A buffer cavity is provided at the joint between the pump body (10) and the end cover (20), and an elastic buffer ring (40) is provided in the buffer cavity. The buffer ring (40) is located on the inner side of the sealing ring (30).

2. A pump body sealing structure according to claim 1, characterized in that: The end cover (20) and the pump body (10) are flange-connected.

3. A pump body sealing structure according to claim 2, characterized in that: The fitting parts of the end cover (20) and the pump body (10) are, from outside to inside, an outer end surface (50), a circumferential surface (60), and an inner end surface (70).

4. A pump body sealing structure according to claim 3, characterized in that: The outer end surface (50) is a fitting surface of the flange, and the buffer cavity is opened on the inner end surface (70).

5. A pump body sealing structure according to claim 4, characterized in that: An annular groove adapted to the sealing ring (30) is provided on the circumferential surface (60) of the end cover (20), and the sealing ring (30) is embedded in the annular groove.

6. A pump body sealing structure according to claim 5, characterized in that: Two annular grooves are provided, and a sealing ring (30) is provided in each annular groove.

7. A pump body sealing structure according to claim 6, characterized in that: An arc guide angle is set at the junction of the outer end surface (50) and the circumferential surface (60).

8. A pump body sealing structure according to claim 7, characterized in that: A protective pad (80) is provided on the outer end surface (50).

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