Screw vacuum pump sealing structure

Abstract

The utility model discloses a screw vacuum pump sealing structure, including the pump body, driving screw, driven screw and sealing assembly, driving screw and driven screw are arranged in parallel in the pump body, and the both ends of driving screw and driven screw are connected with the pump body through bearing respectively, be provided with transmission shaft on driving screw and driven screw, the both ends of sealing assembly are set in the pump body, sealing assembly includes first sealing unit and second sealing unit, the inside of first sealing unit is close to the pump body, second sealing unit sets up the outside of first sealing unit, and forms the sealed cavity between first sealing unit and second sealing unit, first sealing unit includes first sealing ring and first sealing ring, first sealing ring is set up on transmission shaft. The utility model discloses through setting first sealing unit and second sealing unit, forms double -sealed structure, has improved the sealing performance, can effectively prevent the leakage.

Description

Technical Field

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

[0002] Screw vacuum pumps are important vacuum-generating devices widely used in industries such as chemical, pharmaceutical, and electronics. During operation, the performance of the sealing structure directly affects the pump's vacuum level, reliability, and service life. Traditional screw vacuum pump sealing structures typically employ a single sealing method, such as a mechanical seal or packing seal. These methods are prone to seal failure and leakage when facing high vacuum, corrosive media, or conditions containing particulate impurities, leading to decreased pump performance or even malfunction. Furthermore, the installation and maintenance of traditional sealing structures are complex, requiring significant time and effort. Utility Model Content

[0003] The purpose of this utility model is to provide a solution to the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a screw vacuum pump sealing structure, comprising a pump body, a driving screw, a driven screw, and a sealing assembly. The driving screw and the driven screw are arranged parallel to each other within the pump body, and their two ends are respectively connected to the pump body via bearings. A drive shaft is provided on the driving screw and the driven screw. The sealing assembly is located at both ends of the pump body. The sealing assembly includes a first sealing unit and a second sealing unit. The first sealing unit is located near the interior of the pump body, and the second sealing unit is located outside the first sealing unit, forming a sealing cavity between the first sealing unit and the second sealing unit. The first sealing unit includes a first sealing ring and a first sealing ring. The first sealing ring is sleeved on the drive shaft and is fixedly connected to the pump body. The first sealing ring is located between the first sealing ring and the drive shaft. The second sealing unit includes a second sealing ring and a second sealing ring. The second sealing ring is sleeved on the drive shaft and is fixedly connected to the pump body. The second sealing ring is located between the second sealing ring and the drive shaft.

[0005] Preferably, a pressure detection device and an inflation device are connected inside the sealed cavity, and the pressure detection device and the inflation device are connected to the sealed cavity through pipes.

[0006] Preferably, the pressure detection device includes a pressure gauge and a connecting pipe. The pressure gauge is fixedly installed outside the pump body, and one end of the pressure gauge is connected to the sealing cavity through the connecting pipe.

[0007] Preferably, the pump body is provided with an air inlet and an air outlet communicating with the sealed cavity, and valves are respectively provided on the air inlet and the air outlet.

[0008] Preferably, the inflation device is an air pump, which is fixedly installed outside the pump body and connected to the air inlet.

[0009] Preferably, both the first and second sealing rings are made of silicone rubber.

[0010] Preferably, both the first sealing ring and the second sealing ring are made of carbon fiber reinforced polytetrafluoroethylene material.

[0011] Preferably, the contact surfaces of the first sealing ring and the first sealing ring are of a concave-convex structure, and the contact surfaces of the second sealing ring and the second sealing ring are of a concave-convex structure.

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

[0013] 1. This utility model forms a double sealing structure by setting a first sealing unit and a second sealing unit, which improves the sealing performance and can effectively prevent leakage. By setting a pressure detection device and an air filling device in the sealing cavity, the pressure in the sealing cavity can be monitored in real time, and inert gas can be filled into the sealing cavity as needed to maintain the pressure stability in the sealing cavity and further improve the sealing effect.

[0014] 2. This utility model uses a first sealing ring and a second sealing ring made of carbon fiber reinforced polytetrafluoroethylene material, and a first sealing ring and a second sealing ring made of silicone rubber material, which improves the wear resistance, corrosion resistance and sealing performance of the sealing assembly, adapts to complex working conditions, and the sealing assembly has a simple structure, is easy to install and maintain, and reduces maintenance costs and time. Attached Figure Description

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

[0016] Figure 2 This is a schematic diagram of the external structure of this utility model;

[0017] Figure 3 This utility model Figure 1 Enlarged structural diagram at point A in the middle.

[0018] In the diagram: 1. Pump body; 2. Driving screw; 3. Driven screw; 4. Drive shaft; 5. First sealing unit; 6. Second sealing unit; 7. Sealing cavity; 8. First sealing ring; 9. First sealing ring; 10. Second sealing ring; 11. Second sealing ring; 12. Pressure gauge; 13. Connecting pipe; 14. Air inlet; 15. Air outlet; 16. Air pump; 17. Valve. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1-3 This utility model provides a sealing structure technical solution for a screw vacuum pump: it includes a pump body 1, a driving screw 2, a driven screw 3, and a sealing assembly. The driving screw 2 and the driven screw 3 are arranged parallel to each other inside the pump body 1, and their two ends are respectively connected to the pump body 1 through bearings. A drive shaft 4 is provided on the driving screw 2 and the driven screw 3. The sealing assembly is located at both ends of the pump body 1. The sealing assembly includes a first sealing unit 5 and a second sealing unit 6. The first sealing unit 5 is close to the interior of the pump body 1, and the second sealing unit 6 is located outside the first sealing unit 5. On the side, a sealing cavity 7 is formed between the first sealing unit 5 and the second sealing unit 6. The first sealing unit 5 includes a first sealing ring 8 and a first sealing ring 9. The first sealing ring 8 is sleeved on the drive shaft 4 and is fixedly connected to the pump body 1. The first sealing ring 9 is disposed between the first sealing ring 8 and the drive shaft 4. The second sealing unit 6 includes a second sealing ring 10 and a second sealing ring 11. The second sealing ring 10 is sleeved on the drive shaft 4 and is fixedly connected to the pump body 1. The second sealing ring 11 is disposed between the second sealing ring 10 and the drive shaft 4.

[0021] Furthermore, a pressure detection device and an inflation device are connected inside the sealed cavity 7, and the pressure detection device and the inflation device are connected to the sealed cavity 7 through pipes.

[0022] Furthermore, the pressure detection device includes a pressure gauge 12 and a connecting pipe 13. The pressure gauge 12 is fixedly installed on the outside of the pump body 1, and one end of the pressure gauge 12 is connected to the sealing cavity 7 through the connecting pipe 13.

[0023] Furthermore, the pump body 1 is provided with an air inlet 14 and an air outlet 15 that communicate with the sealing cavity 7, and valves 17 are respectively provided on the air inlet 14 and the air outlet 15.

[0024] Furthermore, the inflation device is an air pump 16, which is fixedly installed on the outside of the pump body 1 and is connected to the air inlet 14.

[0025] Furthermore, both the first sealing ring 9 and the second sealing ring 11 are made of silicone rubber, which has good wear resistance, corrosion resistance and elasticity, and can adapt to complex working conditions.

[0026] Furthermore, both the first sealing ring 8 and the second sealing ring 10 are made of carbon fiber reinforced polytetrafluoroethylene material, which has high strength, high hardness and high wear resistance, thus improving the sealing performance.

[0027] Furthermore, the contact surfaces of the first sealing ring 8 and the first sealing ring 9 are of a concave-convex structure, and the contact surfaces of the second sealing ring 10 and the second sealing ring 11 are of a concave-convex structure, which increases the friction and sealing performance of the contact surfaces and improves the sealing effect.

[0028] Working Principle: During operation, the driving screw 2 and driven screw 3 rotate within the pump body 1, transmitting power through the drive shaft 4. Sealing components are located at both ends of the pump body 1 to effectively prevent leakage. The first sealing unit 5 is located near the interior of the pump body 1, providing initial sealing. The second sealing unit 6 is located outside the first sealing unit 5, forming a double-sealing structure and improving sealing performance. A pressure detection device and an inflation device are installed within the sealing cavity 7, allowing real-time monitoring of the pressure. When the pressure is abnormal, inert gas can be injected into the sealing cavity 7 through the inflation device to maintain stable pressure and ensure a good seal. A pressure gauge 12 is connected to the sealing cavity 7 via a connecting pipe 13, providing a direct display of the pressure value. The pump body 1 has an air inlet 14 and an air outlet 15, both connected to the sealing cavity 7. The opening and closing of the air inlet 14 and air outlet 15 can be controlled by a valve 17. When it is necessary to fill the sealed cavity 7 with air, open the valve 17 on the air inlet 14 and start the air pump 16 to fill the sealed cavity 7 with inert gas; when it is necessary to release the gas in the sealed cavity 7, open the valve 17 on the air outlet 15 to release the gas in the sealed cavity 7.

[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A screw vacuum pump sealing structure, comprising a pump body (1), a driving screw (2), a driven screw (3), and a sealing assembly, characterized in that: The driving screw (2) and driven screw (3) are arranged in parallel inside the pump body (1), and the two ends of the driving screw (2) and driven screw (3) are respectively connected to the pump body (1) through bearings. A drive shaft (4) is provided on the driving screw (2) and driven screw (3). The sealing assembly is located at both ends of the pump body (1). The sealing assembly includes a first sealing unit (5) and a second sealing unit (6). The first sealing unit (5) is located close to the interior of the pump body (1), and the second sealing unit (6) is located outside the first sealing unit (5). A sealing cavity is formed between the first sealing unit (5) and the second sealing unit (6). 7) The first sealing unit (5) includes a first sealing ring (8) and a first sealing ring (9). The first sealing ring (8) is sleeved on the transmission shaft (4) and is fixedly connected to the pump body (1). The first sealing ring (9) is disposed between the first sealing ring (8) and the transmission shaft (4). The second sealing unit (6) includes a second sealing ring (10) and a second sealing ring (11). The second sealing ring (10) is sleeved on the transmission shaft (4) and is fixedly connected to the pump body (1). The second sealing ring (11) is disposed between the second sealing ring (10) and the transmission shaft (4).

2. The screw vacuum pump sealing structure according to claim 1, characterized in that, The sealed cavity (7) is connected to a pressure detection device and an inflation device, which are connected to the sealed cavity (7) through pipes.

3. The screw vacuum pump sealing structure according to claim 2, characterized in that, The pressure detection device includes a pressure gauge (12) and a connecting pipe (13). The pressure gauge (12) is fixedly installed outside the pump body (1). One end of the pressure gauge (12) is connected to the sealing cavity (7) through the connecting pipe (13).

4. The screw vacuum pump sealing structure according to claim 3, characterized in that, The pump body (1) is provided with an air inlet (14) and an air outlet (15) that communicate with the sealing cavity (7), and valves (17) are respectively provided on the air inlet (14) and the air outlet (15).

5. The screw vacuum pump sealing structure according to claim 4, characterized in that, The inflation device is an air pump (16), which is fixedly installed outside the pump body (1) and connected to the air inlet (14).

6. The screw vacuum pump sealing structure according to claim 5, characterized in that, Both the first sealing ring (9) and the second sealing ring (11) are made of silicone rubber.

7. The screw vacuum pump sealing structure according to claim 6, characterized in that, Both the first sealing ring (8) and the second sealing ring (10) are made of carbon fiber reinforced polytetrafluoroethylene material.

8. The screw vacuum pump sealing structure according to claim 7, characterized in that, The contact surfaces of the first sealing ring (8) and the first sealing ring (9) are concave-convex structures, and the contact surfaces of the second sealing ring (10) and the second sealing ring (11) are concave-convex structures.

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