Sealing structure of screw vacuum pump

Abstract

The utility model relates to the technical field of vacuum pumps, in particular to a screw vacuum pump sealing structure which comprises a fixing footstand and a sealing assembly, a screw vacuum pump body is fixedly installed at the top of the fixing footstand, a suction pipe is fixedly communicated with the top of the screw vacuum pump body, and the sealing assembly is arranged at the suction pipe. The sealing assembly comprises a fixed flange plate fixedly arranged on the outer wall of the suction pipe in a sleeving mode, a detachable flange plate is arranged on the top of the fixed flange plate, and a filter cartridge is fixedly installed on the inner wall of the detachable flange plate. Through detachable connection between the detachable flange plate and the fixed flange plate, the first sealing ring and the second sealing ring are convenient to disassemble, assemble and replace, the sealing effect is guaranteed, meanwhile, most impurities can be intercepted and filtered out of the screw vacuum pump body through the detachable filter cartridge, and the service life of the screw vacuum pump is prolonged. Therefore, the stability of the internal structure of the screw vacuum pump body is realized.

Description

Technical Field

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

[0002] The screw vacuum pump is an exhaust device that uses a pair of screws to rotate synchronously at high speed in opposite directions in the pump casing to produce suction and exhaust effects. It is an upgraded product of the oil-sealed vacuum pump and can extract gases containing large amounts of water vapor and small amounts of dust. It is widely used in domestic pharmaceutical, chemical, semiconductor and other enterprises with high requirements for clean vacuum.

[0003] At present, screw vacuum pumps are usually connected to external pipes by flanges at their suction pipes, but air leakage is prone to occur between the flange connections. In order to prevent air leakage, a sealing ring is usually installed on the flange surface at the suction pipe of the existing screw vacuum pump. However, the sealing ring is often fixed, and due to its frequent use, it is inevitable that there will be a problem of large wear. Therefore, it is not easy to disassemble and replace the sealing ring, so improvement is needed. Utility Model Content

[0004] The purpose of the utility model is to solve the problems in the background technology and to propose a sealing structure for a screw vacuum pump.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A screw vacuum pump sealing structure includes a fixed foot and a sealing assembly. The top of the fixed foot is fixedly mounted with a screw vacuum pump body. The top of the screw vacuum pump body is fixedly connected to a suction pipe. The sealing assembly is placed on the suction pipe.

[0007] The sealing assembly includes a fixed flange fixedly mounted on the outer wall of the suction pipe, a removable flange is provided on the top of the fixed flange, a filter cartridge is fixedly mounted on the inner wall of the removable flange, a positioning assembly is provided between the filter cartridge and the suction pipe, and a first sealing ring is movably mounted on the outer wall of the filter cartridge, a second sealing ring is movably embedded in the top of the removable flange, and the top of the second sealing ring is higher than the top of the removable flange.

[0008] Preferably, the positioning assembly includes a positioning bar fixedly mounted on the inner wall of the suction pipe, and the positioning bar is slidably inserted into the outer wall of the filter cartridge, and the outer wall of the filter cartridge is provided with a positioning groove matching the positioning bar.

[0009] Preferably, the first sealing ring is attached to the bottom of the detachable flange.

[0010] Preferably, a mounting groove matching the second sealing ring is provided on the top of the detachable flange.

[0011] Preferably, the first sealing ring and the second sealing ring are both made of modified graphite material.

[0012] Preferably, the outer diameter of the filter cartridge is equal to the inner diameter of the suction tube.

[0013] Compared with the existing technology, the advantages of the screw vacuum pump sealing structure provided by the utility model are:

[0014] 1. After removing the external pipe, first pull out the detachable flange, pull out the first sealing ring downwards, and pull out the second sealing ring upwards, and then reinstall the new first sealing ring and second sealing ring in the corresponding positions. This way, the first sealing ring and the second sealing ring can be disassembled and replaced to ensure the sealing effect.

[0015] 2. In the process of the screw vacuum pump body sucking the external air, the filter cartridge can intercept and filter most of the impurities outside the screw vacuum pump body, thereby achieving the stability of the internal structure of the screw vacuum pump body, and it can also be disassembled and cleaned conveniently to achieve better suction effect.

[0016] To sum up, the utility model facilitates the disassembly, assembly and replacement of the first sealing ring and the second sealing ring through the detachable connection between the detachable flange and the fixed flange, thereby ensuring their sealing effect. At the same time, the detachable filter cartridge can be used to intercept and filter most impurities outside the screw vacuum pump body, thereby achieving the stability of the internal structure of the screw vacuum pump body. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram from a first perspective of a screw vacuum pump sealing structure proposed by the present invention;

[0018] Figure 2 This is an exploded view from the first perspective of a sealing component in a screw vacuum pump sealing structure proposed in the present invention;

[0019] Figure 3 This is an exploded view from a second perspective of a sealing component in a screw vacuum pump sealing structure proposed in the present invention.

[0020] In the figure: 1 fixed foot, 2 screw vacuum pump body, 3 suction pipe, 4 fixed flange, 5 detachable flange, 6 filter cartridge, 7 first sealing ring, 8 second sealing ring, 9 mounting groove, 10 positioning groove, 11 positioning strip. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0022] Reference Figures 1 to 3 A screw vacuum pump sealing structure includes a fixed foot 1 and a sealing assembly. A screw vacuum pump body 2 is fixedly installed on the top of the fixed foot 1 (the screw vacuum pump body 2 is an existing public technology and will not be described in detail in this technical solution). In its starting state, the rotation of the screw inside it can produce a suction effect.

[0023] The top of the screw vacuum pump body 2 is fixedly connected to a suction pipe 3, and a sealing assembly is placed on the suction pipe 3; the sealing assembly includes a fixed flange 4 fixedly sleeved on the outer wall of the suction pipe 3, and a removable flange 5 is provided on the top of the fixed flange 4. A filter cartridge 6 is fixedly installed on the inner wall of the removable flange 5. In the process of the screw vacuum pump body 2 sucking the external air, the filter cartridge 6 can intercept and filter most of the impurities outside the screw vacuum pump body 2, thereby achieving the stability of the internal structure of the screw vacuum pump body 2. The outer diameter of the filter cartridge 6 is equal to the inner diameter of the suction pipe 3, so that after the filter cartridge 6 is installed in the suction pipe 3, it can fit with the suction pipe 3, which is beneficial to improve the stability of the filter cartridge 6.

[0024] The outer wall of the filter cartridge 6 is movably sleeved with a first sealing ring 7, which fits the bottom of the detachable flange 5. The top of the detachable flange 5 is movably embedded with a second sealing ring 8. The top of the detachable flange 5 is provided with a mounting groove 9 that matches the second sealing ring 8, and the top of the second sealing ring 8 is higher than the top of the detachable flange 5. When the second sealing ring 8 is removed after being separated from the external pipe, it can be conveniently picked out and removed by applying force to the protruding part of the second sealing ring 8.

[0025] A positioning assembly is provided between the filter cartridge 6 and the suction pipe 3. The positioning assembly includes a positioning strip 11 fixedly mounted on the inner wall of the suction pipe 3, and the positioning strip 11 is slidably inserted into the outer wall of the filter cartridge 6. The outer wall of the filter cartridge 6 is provided with a positioning groove 10 that matches the positioning strip 11. When installing the filter cartridge 6, the sliding plug-in fit between the positioning strip 11 and the positioning groove 10 is utilized, which is conducive to the rapid alignment between each mounting hole on the fixed flange 4 and the removable flange 5, so that the suction pipe 3 is connected to the external pipeline.

[0026] Furthermore, the first sealing ring 7 and the second sealing ring 8 are both made of modified graphite material, which has good compressibility and elasticity, ensuring close contact between the sealing surfaces.

[0027] The working principle of this utility model is:

[0028] When in use, align the flange on the external pipe with the detachable flange 5, then pass each bolt through the corresponding mounting hole in turn, and finally put on the nuts in turn and tighten them, so that the flange on the external pipe can be stably connected to the fixed flange 4, and squeeze the first sealing ring 7 and the second sealing ring 8, so that the sealing surfaces form a close contact, ensuring the sealing between the suction pipe 3 and the external pipe;

[0029] When the first sealing ring 7 and the second sealing ring 8 are worn and need to be replaced, first remove the external pipe, then pull out the detachable flange 5, pull out the first sealing ring 7 downward and the second sealing ring 8 upward in turn, and then install the new first sealing ring 7 and the second sealing ring 8 in the corresponding positions, so that the first sealing ring 7 and the second sealing ring 8 can be disassembled and replaced to ensure their sealing effect. At the same time, after pulling out the filter cartridge 6, it can also be cleaned conveniently to achieve a better suction effect.

[0030] It is further explained that the above-mentioned fixed connection should be understood in a broad sense unless otherwise clearly specified and limited. For example, it can be welding, gluing, or one-piece molding, etc., which are common means well known to those skilled in the art.

[0031] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A screw vacuum pump sealing structure, characterized in that: It comprises a fixed foot (1) and a sealing assembly, wherein a screw vacuum pump body (2) is fixedly mounted on the top of the fixed foot (1), a suction pipe (3) is fixedly connected to the top of the screw vacuum pump body (2), and the sealing assembly is placed on the suction pipe (3); The sealing assembly comprises a fixed flange (4) fixedly mounted on the outer wall of the suction pipe (3); a detachable flange (5) is provided on the top of the fixed flange (4); a filter cartridge (6) is fixedly mounted on the inner wall of the detachable flange (5); a positioning assembly is provided between the filter cartridge (6) and the suction pipe (3); a first sealing ring (7) is movably mounted on the outer wall of the filter cartridge (6); a second sealing ring (8) is movably embedded in the top of the detachable flange (5), and the top of the second sealing ring (8) is higher than the top of the detachable flange (5).

2. A screw vacuum pump sealing structure according to claim 1, characterized in that: The positioning assembly comprises a positioning strip (11) fixedly mounted on the inner wall of the suction pipe (3), and the positioning strip (11) is slidably inserted into the outer wall of the filter cartridge (6), and the outer wall of the filter cartridge (6) is provided with a positioning groove (10) matching the positioning strip (11).

3. The screw vacuum pump sealing structure according to claim 1, characterized in that: The first sealing ring (7) is attached to the bottom of the detachable flange (5).

4. A screw vacuum pump sealing structure according to claim 1, characterized in that: A mounting groove (9) matching the second sealing ring (8) is provided on the top of the detachable flange (5).

5. The screw vacuum pump sealing structure according to claim 1, characterized in that: The first sealing ring (7) and the second sealing ring (8) are both made of modified graphite material.

6. The screw vacuum pump sealing structure according to claim 1, characterized in that: The outer diameter of the filter cartridge (6) is equal to the inner diameter of the suction tube (3).

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