Air tightness optimization structure of vacuum dry pump

Abstract

The utility model discloses an air tightness optimization structure of a vacuum dry pump, which comprises a front end cover, the outer side of the front end cover is fixedly connected with an air inlet, a shell is arranged on one side of the front end cover, a rear end cover is arranged on one side of the shell, the outer side of the rear end cover is fixedly connected with an air outlet, a first clamping groove is arranged on the side face of the front end cover, and a sealing ring is arranged in the first clamping groove. A clamping piece is arranged on the outer side of the sealing ring, a containing cavity is formed in the clamping piece, an elastic piece is arranged in the clamping piece, second clamping grooves are formed in the two sides of the shell, the outer side of the shell is fixedly connected with two symmetrical limiting plates, and a protection shell is arranged on the outer side of the shell. Through the front end cover, the rear end cover, the first clamping groove, the sealing ring, the clamping piece, the containing cavity and the elastic piece, the situation that the air tightness of the gap of the vacuum dry pump is reduced is avoided, the sealing effect of the vacuum dry pump is improved, the service life of the vacuum dry pump is prolonged, and through the front end cover, the rear end cover, the protective shell, the first fixing block, the second fixing block and the threaded rod, the outer side of the shell is protected through the protective shell. And the shell and the sealing ring can be replaced.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum pumps, and particularly relates to an airtightness optimization structure of a vacuum dry pump. Background Technique

[0002] A vacuum pump refers to a device or equipment that uses mechanical, physical, chemical, or physical-chemical methods to evacuate an evacuated container to obtain a vacuum. A vacuum pump is a device for improving, generating, and maintaining a vacuum in a closed space. There are many types of vacuum pumps, including vacuum dry pumps.

[0003] At present, most vacuum dry pumps adopt an integrated structural design, which has high stability. However, during the use process, since the shell of the vacuum dry pump needs to maintain a high-pressure state for a long time, there are high requirements for airtightness. Due to the integrated design, when the shell of the vacuum dry pump is damaged, it is usually repaired by welding. However, welding cannot guarantee the airtightness of the shell, which affects the subsequent use of the vacuum dry pump. Moreover, the gap at the connection between the shell and the front and rear end covers of the vacuum dry pump is prone to change due to vibration, resulting in a decrease in airtightness. Content of the Utility Model

[0004] The purpose of the utility model is to provide an airtightness optimization structure of a vacuum dry pump to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: An airtightness optimization structure of a vacuum dry pump, including a front end cover, the outside of the front end cover is fixedly connected to an air inlet, a shell is arranged on one side of the front end cover, a rear end cover is arranged on one side of the shell, the outside of the rear end cover is fixedly connected to an air outlet, a first slot is opened on the side surface of the front end cover, a sealing ring is arranged inside the first slot, a clamping member is arranged on the outside of the sealing ring, a placement cavity is opened inside the clamping member, a spring piece is arranged inside the clamping member, second slots are opened on both sides of the shell, two symmetrical limiting plates are fixedly connected to the outside of the shell, a protective shell is arranged on the outside of the shell, a limiting groove is opened inside the protective shell, a first fixing block is fixedly connected to the outside of the protective shell, a second fixing block is fixedly connected to the outside of the front end cover, and a threaded rod is arranged on the second fixing block.

[0006] Preferably, the front end cover and the rear end cover are respectively located at both ends of the shell, and first slots are opened on the side surfaces of the front end cover and the rear end cover.

[0007] Preferably, one end of the sealing ring is movably clamped inside the first slot, the sizes of the first slot and the second slot are the same, the sealing ring is movably clamped with the second slot, the vertical cross-sectional shape of the sealing ring is "H" type, and one end of the sealing ring extends into the placement cavity.

[0008] Preferably, a fitting groove is formed on the side surface of the card member, and the card member is slidably connected to the outer sides of two symmetrical sealing rings through the fitting groove.

[0009] Preferably, the elastic piece is made of elastic metal, the elastic piece is arranged in a wavy shape, and both sides of the elastic piece are respectively abutted against the sealing ring.

[0010] Preferably, the limiting plate is movably clamped in the limiting groove, the limiting groove is located on the inner wall of the protective shell, the protective shell is an arc-shaped plate, and the inner wall of the protective shell abuts against the outer side of the shell.

[0011] Preferably, threaded holes are formed on the side surfaces of the first fixing block and the second fixing block, and the first fixing block and the second fixing block are connected by a threaded rod.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] 1. By providing a front end cover, a rear end cover, a first clamping groove, a sealing ring, a card member, a placement cavity and an elastic piece, the shell is connected to the front end cover and the rear end cover respectively through the card member. The airtightness at the gap between the shell and the front end cover and the rear end cover is effectively enhanced through the card member and the sealing ring. At the same time, the elastic force of the elastic piece is used to limit the card member inside the first clamping groove, avoiding the situation that the airtightness at the gap is reduced due to long-term vibration during the use of the vacuum dry pump. Compared with the traditional sealing gasket, it has better airtightness and service life.

[0014] 2. The present utility model also provides a front end cover, a rear end cover, a shell, a protective shell, a first fixing block, a second fixing block and a threaded rod. The outer side of the shell is protected by the protective shell to avoid damage to the outer side of the shell caused by external force. At the same time, the protective shell is used to limit the shell to prevent the shell from expanding in a high-pressure environment, thereby generating gaps and affecting airtightness. The threaded rod and the first fixing block and the second fixing block can be used to conveniently disassemble the protective shell and the shell, replace the shell and the sealing ring, and enhance the applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0016] Figure 2 is a cross-sectional view of the overall structure of the present utility model;

[0017] Figure 3 is a schematic diagram of the structure of the front end cover of the present utility model;

[0018] Figure 4 is a schematic diagram of the structure of the shell of the present utility model;

[0019] Figure 5 is a schematic diagram of the structure of the protective shell of the present utility model.

[0020] In the figure: 1. Front end cover; 2. Air inlet; 3. Housing; 4. Rear end cover; 5. Air outlet; 6. First clamping groove; 7. Sealing ring; 8. Clamping part; 9. Placing cavity; 10. Elastic piece; 11. Second clamping groove; 12. Limiting plate; 13. Protective shell; 14. Limiting groove; 15. First fixing block; 16. Second fixing block; 17. Threaded rod. Detailed implementation manner

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] Please refer to Figures 1-5 , the present invention provides a technical solution: an airtightness optimization structure of a vacuum dry pump, including a front end cover 1, the outside of the front end cover 1 is welded and fixed to the air inlet 2, a housing 3 is arranged on one side of the front end cover 1, a rear end cover 4 is arranged on one side of the housing 3, the outside of the rear end cover 4 is welded and fixed to the air outlet 5, a first clamping groove 6 is opened on the side surface of the front end cover 1, the inside of the first clamping groove 6 is movably clamped with a sealing ring 7, one end of the sealing ring 7 is slidably connected to a clamping part 8, a placing cavity 9 is opened inside the clamping part 8, oil liquid is arranged inside the placing cavity 9, an elastic piece 10 is sleeved inside the placing cavity 9, the elastic piece 10 is a wavy elastic metal, second clamping grooves 11 are opened on both sides of the housing 3, the second clamping grooves 11 are movably clamped with the sealing ring 7, two symmetrical limiting plates 12 are welded and fixed to the outside of the housing 3, a protective shell 13 is sleeved on the outside of the housing 3, a limiting groove 14 is opened inside the protective shell 13, the outside of the limiting plate 12 is movably clamped with the limiting groove 14, the outside of the protective shell 13 is welded and fixed to a first fixing block 15, the outside of the front end cover 1 is welded and fixed to a second fixing block 16, a threaded rod 17 is arranged on the second fixing block 16, both ends of the threaded rod 17 are threadedly connected to nuts, and the threaded rod 17 is respectively threadedly connected to the first fixing block 15 and the second fixing block 16.

[0023] The front end cover 1 and the rear end cover 4 are respectively located at both ends of the housing 3. The first clamping grooves 6 are opened on the sides of the front end cover 1 and the rear end cover 4. One end of the sealing ring 7 is movably clamped inside the first clamping groove 6. The first clamping groove 6 and the second clamping groove 11 have the same size. The sealing ring 7 is movably clamped with the second clamping groove 11. The vertical cross-sectional shape of the sealing ring 7 is "H" shaped. One end of the sealing ring 7 extends into the placement cavity 9. The side of the clamping member 8 is provided with a fitting groove. The clamping member 8 is slidably connected to the outer sides of two symmetric sealing rings 7 through the fitting groove. In this way, the sealing ring 7 can slide on the clamping member 8, that is, slide inside the placement cavity 9, so as to adjust the areas of the sealing ring 7 and the clamping member 8, and avoid the situation that the size of the gap between the front end cover 1 and the housing 3 changes due to vibration, which affects the airtightness. When the housing 3 vibrates, it will push the sealing ring 7 to move inside the clamping member 8, squeezing the elastic piece 10. Subsequently, under the elastic force of the elastic piece 10, the sealing ring 7 is reset. The oil liquid inside the placement cavity 9 enhances the sealing effect of the sealing ring 7 during movement. At the same time, the sealing ring 7 is made of rubber material, and the elastic piece 10 is made of elastic metal. The elastic piece 10 is arranged in a wavy shape. Both sides of the elastic piece 10 are respectively abutted against the sealing ring 7. The limiting plate 12 is movably clamped with the limiting groove 14. The limiting groove 14 is located on the inner wall of the protective shell 13. The protective shell 13 is an arc-shaped plate. The inner wall of the protective shell 13 abuts against the outer side of the housing 3. Threaded holes are opened on the sides of the first fixing block 15 and the second fixing block 16. The first fixing block 15 and the second fixing block 16 are connected by a threaded rod 17. By rotating and removing the nuts, the threaded rod 17 can be removed from the first fixing block 15 and the second fixing block 16, realizing the disassembly of the front end cover 1 and the housing 3, so as to facilitate the replacement of the clamping member 8 and the housing 3, solve the situation that the housing 3 cannot be replaced due to the integrated design, and also solve the situation that the repair by welding of the housing 3 will reduce its own strength and cause the generation of gaps;

[0024] Working principle: When the vacuum dry pump is in use, it can extract air to achieve vacuum by connecting with the air inlet 2 and the air outlet 5 through the connecting pipe. High pressure will be generated inside the housing 3. The protective shell 13 protects the outer side of the housing 3 to prevent the housing 3 from expanding and deforming to generate gaps for gas to escape. At the same time, the high-pressure environment will cause the front end cover 1 and the housing 3 to vibrate. The elastic force of the elastic piece 10 pushes the two side sealing rings 7 to closely fit with the inner wall of the first clamping groove 6, and together with the oil liquid inside the placement cavity 9, it has a good sealing effect, avoiding the situation that the size of the gap at the connection between the housing 3 and the front end cover 1 changes due to vibration, resulting in a decrease in airtightness. When it is necessary to replace the clamping member 8 or the housing 3, after removing the nuts at both ends of the threaded rod 17, the housing 3 and the front end cover 1 can be separated from each other. The sealing rings 7 on the front end cover 1 and the housing 3 can be taken out respectively to replace the clamping member 8. At the same time, the housing 3 can be replaced. Subsequently, the limiting grooves 14 inside the two symmetric protective shells 13 are respectively engaged with the limiting plates 12, and the front end cover 1 and the housing 3 are fixed again by using the threaded rod 17 and the nuts, reducing the difficulty for the staff to maintain and repair the housing 3, and avoiding the situation that the repair by welding of the housing 3 when it is damaged will reduce its own strength.

[0025] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0026] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A structure for optimizing air tightness of a vacuum dry pump, comprising a front end cover (1), characterized in that: The outer side of the front end cover (1) is fixedly connected to the air inlet (2); a shell (3) is provided on one side of the front end cover (1); a rear end cover (4) is provided on one side of the shell (3); the outer side of the rear end cover (4) is fixedly connected to the air outlet (5); a first card slot (6) is provided on the side of the front end cover (1); a sealing ring (7) is provided inside the first card slot (6); a clamping piece (8) is provided on the outer side of the sealing ring (7); a placement cavity (9) is provided inside the clamping piece (8); a spring piece (10) is provided inside the clamping piece (8); a second card slot (11) is provided on both sides of the shell (3); the outer side of the shell (3) is fixedly connected to two symmetrical limit plates (12); a protective shell (13) is provided on the outer side of the shell (3); a limit slot (14) is provided inside the protective shell (13); the outer side of the protective shell (13) is fixedly connected to a first fixing block (15); the outer side of the front end cover (1) is fixedly connected to a second fixing block (16); a threaded rod (17) is provided on the second fixing block (16).

2. The airtightness optimization structure of a vacuum dry pump according to claim 1, characterized in that: The front end cover (1) and the rear end cover (4) are respectively located at two ends of the housing (3), and a card slot (6) is provided on the side surfaces of the front end cover (1) and the rear end cover (4).

3. The airtightness optimization structure of a vacuum dry pump according to claim 1, characterized in that: The interior of the first clamping groove (6) is movably engaged with one end of the sealing ring (7); the first clamping groove (6) and the second clamping groove (11) are of the same size; the sealing ring (7) and the second clamping groove (11) are movably engaged with each other; the vertical cross-section of the sealing ring (7) is in an "H" shape; and one end of the sealing ring (7) extends into the interior of the placement cavity (9).

4. The airtightness optimization structure of a vacuum dry pump according to claim 1, characterized in that: A matching groove is provided on the side of the clamping piece (8), and the clamping piece (8) is slidably connected to the outer sides of two symmetrical sealing rings (7) via the matching groove.

5. The airtightness optimization structure of a vacuum dry pump according to claim 1, characterized in that: The spring sheet (10) is made of elastic metal, the spring sheet (10) is arranged in a wave shape, and two sides of the spring sheet (10) are respectively in contact with the sealing ring (7).

6. The airtightness optimization structure of a vacuum dry pump according to claim 1, characterized in that: The limiting plate (12) is movably engaged with the limiting groove (14); the limiting groove (14) is located on the inner wall of the protective shell (13); the protective shell (13) is an arc-shaped plate; the inner wall of the protective shell (13) abuts against the outer side of the housing (3).

7. The airtightness optimization structure of a vacuum dry pump according to claim 1, characterized in that: The sides of the fixing block 1 (15) and the fixing block 2 (16) are both provided with threaded holes, and the fixing block 1 (15) and the fixing block 2 (16) are connected via a threaded rod (17).

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