Dry vacuum pump sealing structure

Abstract

The utility model discloses a dry vacuum pump sealing structure which comprises a dry vacuum pump body, a fixing connector is arranged on one side of the dry vacuum pump body, the fixing connector is connected with an exhaust pipe through a sealing pipe sleeve, an upper connecting flange plate is arranged at the lower end of the exhaust pipe, and a lower connecting flange plate is arranged at the upper end of the fixing connector. And an upper connecting port and a lower connecting port are formed in the upper position and the lower position in the sealing pipe sleeve correspondingly. The elastic air bag sealing piece is arranged in the middle of the inner wall of the sealing pipe sleeve, the gap between the fixing connector and the exhaust pipe can be sealed through the elastic air bag sealing piece, the interior of the elastic air bag sealing piece is pressurized through the pressurizing air cylinder, the elastic air bag sealing piece is enlarged, and therefore the sealing effect is improved, and the service life of the exhaust pipe is prolonged. The fixing connector and the exhaust pipe are prevented from loosening, the installation sealing performance of the fixing connector and the exhaust pipe is improved, and the pressurizing inflator is based on the principle of an inflator, so that the operation principle is simple.

Description

Technical Field

[0001] This utility model relates to the field of dry vacuum pumps, specifically a sealing structure for a dry vacuum pump. Background Technology

[0002] Dry mechanical vacuum pumps, also known as dry mechanical pumps, are mechanical vacuum pumps that can start pumping gas from atmospheric pressure and directly discharge the pumped gas into the atmosphere. There is no oil or other working medium in the pump chamber, and the ultimate pressure of the pump is on the same order of magnitude or close to that of oil-sealed vacuum pumps. There are five main types of dry vacuum pumps: double-disc type, three-disc type, combined type, external compression screw type, and internal compression screw type.

[0003] Existing technologies still have certain shortcomings in the use of dry vacuum pumps. Traditional dry vacuum pumps are usually installed using flanges, and the interface between the dry vacuum pump and the pumping pipe is prone to leakage, resulting in poor sealing at the connection point. Utility Model Content

[0004] The purpose of this utility model is to provide a sealing structure for a dry vacuum pump, in order to solve the problem mentioned in the background art that traditional dry vacuum pumps are usually installed with flanges, and the interface between the dry vacuum pump and the pumping pipe is prone to leakage, resulting in poor sealing effect at the connection.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a dry vacuum pump sealing structure, comprising a dry vacuum pump body, a fixed interface on one side of the dry vacuum pump body, the fixed interface being connected to a suction pipe via a sealing sleeve, an upper connecting flange at the lower end of the suction pipe, a lower connecting flange at the upper end of the fixed interface, an upper connecting port and a lower connecting port at the upper and lower positions inside the sealing sleeve, an elastic airbag seal at the middle position of the inner wall of the sealing sleeve, air holes on the inner wall surface of the elastic airbag seal, pressurizing cylinders on both sides of the outer side of the sealing sleeve, a push rod inside the pressurizing cylinder, a piston at the lower end of the push rod, and a locking cap at the upper end of the push rod.

[0006] In a further embodiment, the upper connecting flange and the sealing sleeve are fixedly connected by upper fixing bolts, and the number of upper fixing bolts is not less than six.

[0007] In a further embodiment, the lower connecting flange and the sealing sleeve are fixedly connected by lower fixing bolts, and the number of lower fixing bolts is not less than six.

[0008] In a further embodiment, the pressurizing cylinder and the elastic airbag seal are fixedly connected by a shaped connecting pipe, and the pressurizing cylinder and the sealing sleeve are fixedly connected by a welding piece.

[0009] In a further embodiment, the top of the locking cap is provided with a handle, and the locking cap is fixedly connected to the pressurized air cylinder by threads.

[0010] In a further embodiment, the air extraction pipe and the sealing sleeve are connected by an upper connector and an upper connection port, and the fixed interface and the sealing sleeve are connected by a lower connector and a lower connection port. Both the upper connector and the lower connector are provided with rubber sealing gaskets, and the upper connector and the lower connector are fixedly connected by threads.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. In this utility model, an elastic airbag seal is provided in the middle of the inner wall of the sealing sleeve. The elastic airbag seal can seal the gap between the fixed interface and the suction pipe. The elastic airbag seal is pressurized by a pressurizing air cylinder, which makes the elastic airbag seal larger, thereby improving the sealing effect, preventing the fixed interface and the suction pipe from loosening, and increasing the sealing performance of the fixed interface and the suction pipe installation. The pressurizing air cylinder is based on the principle of an air pump, and the operation principle is simple and easier to operate. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the sealing structure of a dry vacuum pump according to the present invention;

[0014] Figure 2 This is a schematic diagram of the cross-sectional structure of the sealing sleeve of this utility model;

[0015] Figure 3 This is a schematic diagram showing the detailed structure of part A of this utility model;

[0016] Figure 4 This is a schematic diagram showing the disassembled structure of the air extraction pipe and the sealing sleeve of this utility model.

[0017] Figure 5 This is a schematic diagram of the cross-sectional structure of the elastic airbag seal of this utility model;

[0018] Figure 6 This is a front view of the sealing sleeve of this utility model;

[0019] Figure 7 This is a top view of the upper connecting flange of this utility model.

[0020] In the diagram: 1. Dry vacuum pump body; 2. Fixed interface; 3. Lower connecting flange; 4. Lower fixing bolt; 5. Upper connecting flange; 6. Evacuation pipe; 7. Upper fixing bolt; 8. Sealing sleeve; 9. Pressurizing cylinder; 10. Piston; 11. Push rod; 12. Locking cap; 13. Tightening handle; 14. Welded piece; 15. Rubber sealing gasket; 16. Upper connector; 17. Upper connection port; 18. Elastic airbag seal; 19. Lower connection port; 20. Irregularly shaped connecting pipe; 21. Air hole; 22. Lower connector. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] Please see Figure 1-7 This utility model provides an embodiment of a dry vacuum pump sealing structure, including a dry vacuum pump body 1. A fixed interface 2 is provided on one side of the dry vacuum pump body 1. The fixed interface 2 is connected to a suction pipe 6 via a sealing sleeve 8. An upper connecting flange 5 is provided at the lower end of the suction pipe 6, and a lower connecting flange 3 is provided at the upper end of the fixed interface 2. An upper connecting port 17 and a lower connecting port 19 are respectively provided at the upper and lower positions inside the sealing sleeve 8. An elastic airbag seal 18 is provided at the middle position of the inner wall of the sealing sleeve 8. An air hole 21 is provided on the inner wall surface of the elastic airbag seal 18. Pressurized air cylinders 9 are provided on both sides of the outer side of the sealing sleeve 8. A push rod 11 is provided inside the pressurized air cylinder 9. A piston 10 is provided at the lower end of the push rod 11, and a locking cap 12 is provided at the upper end of the push rod 11. A handle 13 is provided at the top of the locking cap 12, and the locking cap 12 is fixedly connected to the pressurized air cylinder 9 by threads. For handheld operation of locking cap 12, pressurizing cylinder 9 and elastic airbag seal 18 are fixedly connected by special-shaped connecting tube 20, and pressurizing cylinder 9 and sealing sleeve 8 are fixedly connected by welding piece 14. Special-shaped connecting tube 20 is used to connect and fix pressurizing cylinder 9 and elastic airbag seal 18; fixing interface 2 is used to install suction pipe 6 and dry vacuum pump body 1; elastic airbag seal 18 is used to increase the sealing performance of the connection between fixing interface 2 and suction pipe 6; sealing sleeve 8 is used to assemble fixing interface 2 and suction pipe 6; air hole 21 is used to evacuate air from the inside of pressurizing cylinder 9; piston 10 is used to seal the inside of pressurizing cylinder 9; pressurizing cylinder 9 is used to store air and inflate the inside of elastic airbag seal 18 to increase the volume of elastic airbag seal 18; locking cap 12 is used to lock the position of push rod 11 pushed downward.

[0023] The upper connecting flange 5 and the sealing sleeve 8 are fixedly connected by upper fixing bolts 7, and the number of upper fixing bolts 7 is not less than six. The upper fixing bolts 7 are used to fix the upper connecting flange 5 and the sealing sleeve 8. The lower connecting flange 3 and the sealing sleeve 8 are fixedly connected by lower fixing bolts 4, and the number of lower fixing bolts 4 is not less than six. The lower fixing bolts 4 are used to fix the lower connecting flange 3 and the sealing sleeve 8.

[0024] The extraction pipe 6 and the sealing sleeve 8 are connected by the upper connector 16 and the upper connection port 17. The fixed interface 2 and the sealing sleeve 8 are connected by the lower connector 22 and the lower connection port 19. Both the upper connector 16 and the lower connector 22 are provided with rubber sealing gaskets 15. The upper connector 16 and the lower connector 22 are fixedly connected by threads. The connection between the upper connector 16 and the upper connection port 17 is used to assemble and fix the extraction pipe 6 and the sealing sleeve 8. The connection between the lower connector 22 and the lower connection port 19 is used to assemble and fix the fixed interface 2 and the sealing sleeve 8.

[0025] Working principle: In use, the sealing sleeve 8 is installed to the fixed interface 2 by connecting the lower connector 22 to the lower connection port 19. The sealing sleeve 8 is fixed to the lower connecting flange 3 by the lower fixing bolt 4. The air extraction pipe 6 is installed to the sealing sleeve 8 by connecting the upper connector 16 to the upper connection port 17. The upper connector 16 is tightened to the lower connector 22 by threading. The upper connecting flange 5 is fixed to the sealing sleeve 8 by the upper fixing bolt 7. The rubber sealing gasket 15 seals the gap between the upper connector 16 and the upper connection port 17 and the lower connector 22 and the lower connection port 19. The push rod 11 is pushed down to lower the piston 10, which pressurizes the inside of the elastic airbag seal 18, increasing the volume of the elastic airbag seal 18 and strengthening the seal of the gap between the fixed interface 2 and the air extraction pipe 6. The locking cap 12 is tightened to the pressurized air cylinder 9 by threading to prevent the elastic airbag seal 18 from releasing air.

[0026] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A sealing structure for a dry vacuum pump, comprising a dry vacuum pump body (1), characterized in that: The dry vacuum pump body (1) has a fixed interface (2) on one side. The fixed interface (2) is connected to the suction pipe (6) through a sealing sleeve (8). The lower end of the suction pipe (6) is provided with an upper connecting flange (5), and the upper end of the fixed interface (2) is provided with a lower connecting flange (3). The upper and lower positions inside the sealing sleeve (8) are respectively provided with an upper connecting port (17) and a lower connecting port (19). The middle position of the inner wall of the sealing sleeve (8) is... An elastic airbag seal (18) is provided. The inner ring of the elastic airbag seal (18) has an air hole (21) on its wall. Pressurized air cylinders (9) are provided on both sides of the outer side of the sealing sleeve (8). A push rod (11) is provided inside the pressurized air cylinder (9). A piston (10) is provided at the lower end of the push rod (11). A locking cap (12) is provided at the upper end of the push rod (11). The air hole (21) is the channel for the pressurized air cylinder (9) to supply air to the airbag.

2. The sealing structure of a dry vacuum pump according to claim 1, characterized in that: The upper connecting flange (5) and the sealing sleeve (8) are fixedly connected by upper fixing bolts (7), and the number of upper fixing bolts (7) is not less than six.

3. The sealing structure of a dry vacuum pump according to claim 1, characterized in that: The lower connecting flange (3) and the sealing sleeve (8) are fixedly connected by lower fixing bolts (4), and the number of lower fixing bolts (4) is not less than six.

4. The dry vacuum pump sealing structure according to claim 1, characterized in that: The pressurizing cylinder (9) and the elastic airbag seal (18) are fixedly connected by a special-shaped connecting pipe (20), and the pressurizing cylinder (9) and the sealing sleeve (8) are fixedly connected by a welding piece (14).

5. The sealing structure of a dry vacuum pump according to claim 1, characterized in that: The top of the locking cap (12) is provided with a handle (13), and the locking cap (12) is fixedly connected to the pressurized air cylinder (9) by threads.

6. The sealing structure of a dry vacuum pump according to claim 1, characterized in that: The air extraction pipe (6) and the sealing sleeve (8) are connected by an upper connector (16) and an upper connection port (17). The fixed interface (2) and the sealing sleeve (8) are connected by a lower connector (22) and a lower connection port (19). Both the upper connector (16) and the lower connector (22) are provided with rubber sealing gaskets (15), and the upper connector (16) and the lower connector (22) are fixedly connected by threads.

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