A sealing structure of a vacuum pump shaft

Abstract

The utility model discloses a kind of sealing structure of vacuum pump pump shaft, belong to vacuum pump technical field, it includes fixed part, bearing is installed in the fixed part, the fixed part is rotatably installed with rotating part by bearing, insulating cover is installed on the rotating part, the rotating part one side is connected with positioning ring, the rotating part other side and positioning ring all are connected with sealing ring.This sealing structure of vacuum pump pump shaft, by screwing thread ring, promote thread ring to move on thread section and promote push ring, make push ring and rotating part abut, at this time L-shaped plate moves in positioning ring, push groove will push fixed rod in the process, promote multiple sector blocks along with connecting strip sliding, so that multiple sector blocks jointly form annular structure, and sealing gasket can be contacted with pump shaft and be extruded, to form annular sealing surface with pump shaft outer circle, and then cooperate sealing ring and form multiple sealing layers, improve sealing effect.

Description

Technical Field

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

[0002] A vacuum pump is a device that generates, improves, or maintains a vacuum in a closed space through mechanical, physical, or chemical means. It is widely used in industries, scientific research, and medical fields. Its working principle mainly relies on gas compression or adsorption. Common types include rotary vane pumps, Roots pumps, molecular pumps, and diffusion pumps. Traditionally, pump shaft sealing is done by combining a single sealing ring or gasket with the pump shaft. This results in low sealing efficiency and is prone to leakage problems. Utility Model Content

[0003] To overcome the above-mentioned defects, this utility model provides a sealing structure for the pump shaft of a vacuum pump, which solves the problem that relying on a single sealing ring or gasket to contact the pump shaft to achieve the purpose of sealing results in low sealing effect and easy leakage.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a sealing structure for a vacuum pump shaft, including a fixing member, a bearing installed inside the fixing member, a rotating member rotatably mounted on the fixing member via the bearing, an isolation cover installed on the rotating member, a positioning ring connected to one side of the rotating member, and sealing rings connected to both the other side of the rotating member and the positioning ring, and a threaded section provided on the rotating member; A threaded ring is threaded onto the threaded section, a push ring is rotatably connected to the threaded ring, multiple L-shaped plates are connected to the push ring, push grooves are opened on the L-shaped plates, multiple connecting strips are connected inside the positioning ring, a sector block is slidably connected to the connecting strip, a U-shaped groove is provided on one side of the sector block and a fixing rod is connected inside the groove, and a sealing gasket is connected to the sector block.

[0005] As a further embodiment of this utility model: multiple positioning strips are connected to the inner side of the isolation cover, multiple bolts are threaded onto the isolation cover, and the isolation cover is sleeved on the rotating part and in close contact with the sealing ring.

[0006] As a further embodiment of this utility model: the threaded ring is provided with anti-slip texture, and four threaded holes are provided on the threaded ring in a centrally symmetrical manner, and the bolt is threadedly engaged with the threaded holes.

[0007] As a further embodiment of this utility model: the L-shaped plate slides through the positioning ring and within the positioning ring, and the L-shaped plate is located in the U-shaped groove on one side of the fan-shaped block; the fixing rod slides within the push groove, and the push groove is inclinedly arranged on the L-shaped plate.

[0008] As a further embodiment of this utility model: a connecting groove is provided on the fan-shaped block, and the connecting strip is T-shaped and slides in conjunction with the connecting groove.

[0009] As a further embodiment of this utility model: six positioning grooves are provided on the positioning ring in a centrally symmetrical manner, and the positioning strip is inserted into the positioning grooves.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. The sealing structure of the vacuum pump shaft consists of a sealing ring, a threaded ring, a push ring, an L-shaped plate, a push groove, a fixed rod, sector blocks, and a sealing gasket. By rotating the threaded ring, it moves on the threaded section and pushes the push ring, causing the push ring to abut against the rotating part. At this time, the L-shaped plate moves within the positioning ring. During this process, the push groove pushes the fixed rod, causing multiple sector blocks to slide along the connecting strip. These multiple sector blocks together form a ring structure, while the sealing gasket can contact and be squeezed with the pump shaft, thus forming a ring-shaped sealing surface that fits against the outer circle of the pump shaft. This, in conjunction with the sealing ring, forms multiple sealing layers, improving the sealing effect. 2. The sealing structure of the vacuum pump shaft is provided with an isolation cover, threaded holes, bolts, positioning grooves and positioning strips. When the push ring abuts against the rotating part, the isolation cover is pushed into the rotating part and fitted onto it, causing the positioning strip to insert into the positioning groove. At this time, the isolation cover will fit and contact the sealing ring. Then, the bolts are turned to make the bolts threaded together with the threaded holes, thereby fixing the isolation cover on the rotating part and covering the threaded section and the positioning ring area, thereby reducing the adhesion of impurities on the threaded section. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the cross-sectional structure of the fastener of this utility model; Figure 3 This is a schematic diagram of the cross-sectional structure of the rotating component of this utility model; Figure 4 This is a schematic diagram of the cross-sectional structure of the threaded ring of this utility model; Figure 5 This is a schematic diagram of the three-dimensional structure of the fixing frame of this utility model; In the diagram: 1. Fixing component; 2. Bearing; 3. Rotating component; 4. Isolation cover; 5. Positioning ring; 6. Sealing ring; 7. Threaded section; 8. Threaded ring; 9. Push ring; 10. L-shaped plate; 11. Push groove; 12. Connecting strip; 13. Sector block; 14. Fixing rod; 15. Sealing gasket; 16. Positioning strip; 17. Bolt; 18. Threaded hole; 19. Connecting groove; 20. Positioning groove. Detailed Implementation

[0012] The technical solution of this patent will be further described in detail below with reference to specific embodiments.

[0013] like Figure 1-5 As shown, this utility model provides a technical solution: a sealing structure for a vacuum pump shaft, including a fixing member 1, a bearing 2 installed inside the fixing member 1, a rotating member 3 rotatably mounted on the fixing member 1 via the bearing 2, an isolation cover 4 installed on the rotating member 3, multiple positioning strips 16 connected to the inner side of the isolation cover 4, multiple bolts 17 threadedly connected to the isolation cover 4, and the isolation cover 4 sleeved on the rotating member 3 and in close contact with the sealing ring 6, thereby covering the threaded section 7 and the area of ​​the positioning ring 5 by the isolation cover 4, reducing the corrosion caused by impurities adhering to the threaded section 7.

[0014] A positioning ring 5 is connected to one side of the rotating part 3. Six positioning grooves 20 are provided on the positioning ring 5 in a centrally symmetrical manner. The positioning strip 16 is inserted into the positioning groove 20. Through the precise insertion of the six centrally symmetrically distributed positioning grooves 20 and the positioning strip 16, the isolation cover 4 is positioned at multiple points on the positioning ring 5, which improves the accuracy of installation and avoids skewing.

[0015] On the other side of the rotating part 3, a sealing ring 6 is connected to the positioning ring 5. The rotating part 3 is provided with a threaded section 7, and a threaded ring 8 is threadedly connected to the threaded section 7. The threaded ring 8 is provided with anti-slip texture, and four threaded holes 18 are provided on the threaded ring 8 in a centrally symmetrical manner. The bolt 17 is threadedly engaged with the threaded holes 18. The anti-slip texture on the threaded ring 8 allows the operator to easily turn the threaded ring 8 and avoid accidental slippage. The threaded connection between the bolt 17 and the threaded holes 18 can fix the isolation cover 4. Then, the isolation cover 4, which is fixed by the positioning strip 16 and the positioning groove 20, restricts the threaded ring 8 and prevents the threaded ring 8 from rotating accidentally.

[0016] A push ring 9 is rotatably connected to the threaded ring 8. Multiple L-shaped plates 10 are connected to the push ring 9. The L-shaped plates 10 have push grooves 11. The L-shaped plates 10 slide through the positioning ring 5 and are located in the U-shaped groove on one side of the sector block 13. The fixing rod 14 slides in the push groove 11. The push groove 11 is inclined on the L-shaped plate 10. The inclined push groove 11 can push the fixing rod 14 when the L-shaped plate 10 moves, so that the sector block 13 slides along the connecting strip 12, causing multiple sector blocks 13 to move synchronously towards the center to form a ring structure and achieve a tight seal.

[0017] Multiple connecting strips 12 are connected inside the positioning ring 5. Sector blocks 13 are slidably connected to the connecting strips 12. Connecting grooves 19 are opened on the sector blocks 13. The connecting strips 12 are T-shaped and slide with the connecting grooves 19. A U-shaped slot is provided on one side of the sector block 13 and a fixing rod 14 is connected in the slot. A sealing gasket 15 is connected to the sector block 13. Through the sliding connection between the connecting strips 12 and the connecting grooves 19, and the T-shaped design of the connecting strips 12, a stable sliding constraint can be provided for the sector block 13 to avoid the sector block 13 from shifting during the sliding process.

[0018] The working principle of this utility model is as follows: After the pump shaft is inserted into the rotating part 3, the threaded ring 8 is turned to move on the threaded section 7 and push the push ring 9. The push ring 9 can then push the L-shaped plate 10 to move within the positioning ring 5 until the push ring 9 abuts against the rotating part 3. During this process, the push groove 11 pushes the fixing rod 14, causing multiple sector blocks 13 to slide towards the center along the connecting strip 12, so that multiple sector blocks 13 together form a ring-like structure. The sealing gasket 15 can then contact the pump shaft and be squeezed, thereby forming an annular sealing surface that fits against the outer circle of the pump shaft. This, in turn, works with the sealing ring 6 to form multiple sealing layers. Then, the isolation cover 4 is pushed into the rotating part 3, causing the positioning strip 16 to insert into the positioning groove 20. At this time, the isolation cover 4 will fit against the sealing ring 6. Then, by turning the bolt 17, the bolt 17 is threadedly connected to the threaded hole 18, thereby fixing the isolation cover 4 on the rotating part 3 and covering the area of ​​the threaded section 7 and the positioning ring 5.

[0019] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] The preferred embodiments of this patent have been described in detail above. However, this patent is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this patent.

Claims

1. A sealing structure for a vacuum pump shaft, comprising a fixing member (1), characterized in that: The fixing member (1) is equipped with a bearing (2), and the fixing member (1) is rotatably mounted with a rotating member (3) via the bearing (2). An isolation cover (4) is installed on the rotating member (3). A positioning ring (5) is connected to one side of the rotating member (3), and a sealing ring (6) is connected to both the other side of the rotating member (3) and the positioning ring (5). A threaded section (7) is provided on the rotating member (3). A threaded ring (8) is threadedly connected to the threaded section (7), a push ring (9) is rotatably connected to the threaded ring (8), a plurality of L-shaped plates (10) are connected to the push ring (9), a push groove (11) is opened on the L-shaped plate (10), a plurality of connecting strips (12) are connected inside the positioning ring (5), a fan-shaped block (13) is slidably connected to the connecting strip (12), a U-shaped groove is provided on one side of the fan-shaped block (13) and a fixing rod (14) is connected inside the groove, and a sealing gasket (15) is connected to the fan-shaped block (13).

2. The sealing structure for a vacuum pump shaft according to claim 1, characterized in that: The inner side of the isolation cover (4) is connected with multiple positioning strips (16), and multiple bolts (17) are threaded on the isolation cover (4). The isolation cover (4) is sleeved on the rotating part (3) and in contact with the sealing ring (6).

3. The sealing structure for a vacuum pump shaft according to claim 2, characterized in that: The threaded ring (8) is provided with anti-slip texture, and four threaded holes (18) are provided on the threaded ring (8) in a centrally symmetrical manner. The bolt (17) is threadedly engaged with the threaded holes (18).

4. The sealing structure for a vacuum pump shaft according to claim 1, characterized in that: The L-shaped plate (10) slides through the positioning ring (5) and is located in the U-shaped groove on one side of the fan-shaped block (13). The fixing rod (14) slides in the push groove (11) and the push groove (11) is inclined on the L-shaped plate (10).

5. The sealing structure for a vacuum pump shaft according to claim 1, characterized in that: The sector block (13) has a connecting groove (19), and the connecting strip (12) is T-shaped and slides in conjunction with the connecting groove (19).

6. The sealing structure for a vacuum pump shaft according to claim 2, characterized in that: The positioning ring (5) has six positioning slots (20) arranged in a centrally symmetrical manner, and the positioning strip (16) is inserted into the positioning slots (20).

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