Mechanical sealing device for metal corrugated pipe

Abstract

The utility model discloses a metal bellows mechanical sealing device which comprises a positioning seat and a rotating shaft, the positioning seat is arranged at one end outside the rotating shaft, an adjusting bin is arranged inside the positioning seat, one end of the adjusting bin is provided with an inserting groove, a pull rod is arranged inside the adjusting bin, and the inserting groove is connected with the inserting groove. A pull block is fixed to one end of the pull rod, a push block is fixed to the other end of the pull rod, a spring is connected between one end of the push block and one end of the inner wall of the adjusting bin, a static ring is arranged outside the rotating shaft, a movable ring is arranged between the static ring and the positioning seat, and a connecting ring is arranged at the position, corresponding to the outer portion of the rotating shaft, of one end of the protective sleeve. A receding groove is formed in the side portion of the connecting ring, the other end of the protective sleeve is connected with a limiting ring, and the side portion of the limiting ring is in threaded fit with one end of an anti-rotating pin. The sealing device is easy to disassemble, assemble and maintain and good in sealing performance.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical seals, in particular to a metal bellows mechanical seal device. Background Art

[0002] Metal bellows mechanical seals are often used to seal rotating shafts in pumps, reactors, and high-speed centrifugal compressors. These seals are connected between the port of the sealed equipment and the rotating shaft to prevent leakage of the working medium from the port. Metal bellows mechanical seals have the characteristics of stable floating, high temperature and high pressure resistance, suitability for high speeds, and long service life.

[0003] The existing technical solutions have some disadvantages. First, they are not easy to disassemble and maintain, which consumes manpower. Second, the sealing performance is poor, which affects the sealing effect. Utility Model Content

[0004] The purpose of the utility model is to provide a metal bellows mechanical sealing device to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a metal bellows mechanical sealing device, comprising a positioning seat and a rotating shaft, the positioning seat being arranged at one end outside the rotating shaft, an adjusting chamber being arranged inside the positioning seat, and a slot being arranged at one end of the adjusting chamber, a pull rod being arranged inside the adjusting chamber, and a pull block being fixed at one end of the pull rod, a push block being fixed at the other end of the pull rod, and a spring being connected between one end of the push block and one end of the inner wall of the adjusting chamber, a static ring being arranged outside the rotating shaft, and a dynamic ring being arranged between the static ring and the positioning seat.

[0006] A bellows is provided on the outside of the rotating shaft, and a protective sleeve is provided on the outside of the bellows; one end of the protective sleeve is connected to an insert block, and the insert block is engaged with the slot; both ends of the protective sleeve are provided with a second extrusion support, and the side of the positioning seat is provided with a first extrusion support corresponding to the second extrusion support.

[0007] Preferably, a connecting ring is provided at the other end of the outer portion of the rotating shaft, and a third extrusion support is provided on the side of the connecting ring.

[0008] Preferably, a sealing ring 1 is provided between the second extrusion support and the first extrusion support corresponding to the rotating shaft, and a sealing ring 2 is provided between the second extrusion support and the third extrusion support corresponding to the rotating shaft.

[0009] Preferably, a connecting ring is provided on the outside of the rotating shaft at one end of the protective sleeve, and a clearance groove is provided on the side of the connecting ring.

[0010] Preferably, an anti-rotation pin is provided inside the clearance groove, the other end of the protective sleeve is connected to a limiting ring, and the side of the limiting ring is threadedly engaged with one end of the anti-rotation pin.

[0011] The beneficial technical effects of this technical solution are as follows: easy to disassemble and maintain, and good sealing; the protective cover can protect the outside of the bellows, improving the safety of the use of the bellows, and the pull block can be pulled upward and downward respectively to drive the pull rod to move outward and the spring to compress, thereby driving the push block to move to make way for the insert block, and then push the protective cover toward the slot so that the insert block is inserted into the slot, and then release the pull block, and under the push of the spring, the push block is driven to reset through the pull rod so that the push block is inserted into the insert block, and one end of the protective cover is positioned, and the clearance groove can protect the edge of the anti-rotation pin to avoid damage to the anti-rotation pin and affect the stability of the anti-rotation pin. The anti-rotation pin can be screwed into the connecting ring and the limit ring in turn through the clearance groove to position the other end of the protective cover, which is easy to disassemble and maintain.

[0012] According to the technical solution, the sealing ring 1 can be pushed into one end of the protective sleeve first. The second extrusion support and the first extrusion support have a number of protrusions evenly distributed on their surfaces, which can increase the friction between the second extrusion support, the first extrusion support and the sealing ring 1, thereby improving the sealing performance of one end of the protective sleeve. The sealing ring 2 can be pushed into the other end of the protective sleeve later. The third extrusion support has a number of protrusions evenly distributed on its surface, similar to the second extrusion support, which can increase the friction between the second extrusion support, the third extrusion support and the sealing ring 2, thereby improving the sealing performance of the other end of the protective sleeve, and achieving excellent sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the main cross-sectional structure of the present utility model.

[0014] Figure 2 This is a schematic diagram of the main structure of the present utility model.

[0015] Figure 3 For the utility model Figure 1 Enlarged structural diagram at point A in the middle.

[0016] Figure 4 For the utility model Figure 1 Enlarged structural diagram at point B in the middle.

[0017] Figure 5 This is a schematic diagram of the push block and pull rod structure of the utility model.

[0018] In the figure: 1. Rotating shaft; 2. Moving ring; 3. Sealing ring 1; 4. Bellows; 5. Sealing ring 2; 6. Connecting ring; 7. Limiting ring; 8. Protective sleeve; 9. Positioning seat; 10. Pull block; 11. Static ring; 12. Push block; 13. Slot; 14. First extrusion support; 15. Anti-rotation pin; 16. Second extrusion support; 17. Insert block; 18. Spring; 19. Adjustment chamber; 20. Pull rod; 21. Third extrusion support; 22. Clearance groove. DETAILED DESCRIPTION

[0019] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0020] See also Figure 1-5 , the utility model provides an embodiment: a metal bellows mechanical sealing device, including a positioning seat 9 and a rotating shaft 1, the positioning seat 9 is arranged at one end outside the rotating shaft 1, an adjusting chamber 19 is arranged inside the positioning seat 9, and one end of the adjusting chamber 19 is provided with a slot 13, a pull rod 20 is arranged inside the adjusting chamber 19, and one end of the pull rod 20 is fixed with a pull block 10, the other end of the pull rod 20 is fixed with a push block 12, and a spring 18 is connected between one end of the push block 12 and one end of the inner wall of the adjusting chamber 19 to ensure One end of the protective sleeve 8 is connected to an insert block 17, and the insert block 17 is engaged with the slot 13; the pull block 10 can be pulled upward and downward respectively, driving the pull rod 20 to move outward and the spring 18 to compress, thereby driving the push block 12 to move to make way for the insert block 17, and then pushing the protective sleeve 8 toward the slot 13 so that the insert block 17 is inserted into the slot 13, and then releasing the pull block 10, and under the push of the spring 18, the pull rod 20 drives the push block 12 to reset, so that the push block 12 is inserted into the insert block 17, thereby positioning one end of the protective sleeve 8.

[0021] A static ring 11 is provided on the outside of the rotating shaft 1, and a dynamic ring 2 is provided between the static ring 11 and the positioning seat 9. A bellows 4 is provided on the outside of the rotating shaft 1, and a protective sleeve 8 is provided on the outside of the bellows 4; the protective sleeve 8 can protect the outside of the bellows 4 and improve the safety of the use of the bellows 4.

[0022] Both ends of the protective sleeve 8 are provided with a second extrusion support 16, and the side of the positioning seat 9 is provided with a first extrusion support 14 corresponding to the second extrusion support 16, and a sealing ring 3 is provided between the second extrusion support 16 and the first extrusion support 14 corresponding to the rotating shaft 1; the sealing ring 3 can be pushed into one end of the protective sleeve 8 first, and a number of protrusions are evenly distributed on the surface of the second extrusion support 16 and the first extrusion support 14, which can increase the friction between the second extrusion support 16, the first extrusion support 14 and the sealing ring 3, which is beneficial to improving the sealing performance of one end of the protective sleeve 8.

[0023] A connecting ring 6 is provided at the other end of the outside of the rotating shaft 1, and a third extrusion support 21 is provided on the side of the connecting ring 6. A sealing ring 25 is provided between the second extrusion support 16 and the third extrusion support 21 corresponding to the rotating shaft 1; the sealing ring 25 can be pushed back into the other end of the protective sleeve 8. The third extrusion support 21 has a plurality of protrusions distributed at equal intervals, the same as the surface of the second extrusion support 16, which can increase the friction between the second extrusion support 16, the third extrusion support 21 and the sealing ring 25, which is beneficial to improving the sealing performance of the other end of the protective sleeve 8.

[0024] A connecting ring 6 is provided at one end of the protective sleeve 8 corresponding to the outside of the rotating shaft 1, and a clearance groove 22 is provided on the side of the connecting ring 6; the clearance groove 22 can protect the edge of the anti-rotation pin 15, prevent the anti-rotation pin 15 from being damaged, and affect the stability of the anti-rotation pin 15.

[0025] An anti-rotation pin 15 is provided inside the clearance groove 22, and the other end of the protective sleeve 8 is connected to the limiting ring 7, and the side of the limiting ring 7 is threadedly engaged with one end of the anti-rotation pin 15; the anti-rotation pin 15 can be screwed into the connecting ring 6 and the limiting ring 7 in turn through the clearance groove 22 to position the other end of the protective sleeve 8.

[0026] The working principle of this equipment is as follows. First, the sealing ring 3 can be pushed into one end of the protective sleeve 8. There are several protrusions equidistantly distributed on the surface of the second extrusion support 16 and the first extrusion support 14, which can increase the friction between the second extrusion support 16, the first extrusion support 14 and the sealing ring 3, which is beneficial to improve the sealing of one end of the protective sleeve 8. The protective sleeve 8 can protect the outside of the bellows 4 and improve the safety of the use of the bellows 4. The pull block 10 can be pulled upward and downward respectively, driving the pull rod 20 to move outward and the spring 18 to compress, thereby driving the push block 12 to move to make way for the insert block 17, and then pushing the protective sleeve 8 toward the slot 13, so that the insert block 17 is inserted into the slot 13, and then the pull block 10 is released.

[0027] Under the push of the spring 18, the pull rod 20 drives the push block 12 to reset, so that the push block 12 is inserted into the insert block 17, and one end of the protective sleeve 8 is positioned. The sealing ring 25 can be pushed into the other end of the protective sleeve 8. The third extrusion support 21 has the same surface as the second extrusion support 16, and has several protrusions distributed at equal intervals, which can increase the friction between the second extrusion support 16, the third extrusion support 21 and the sealing ring 25, which is beneficial to improve the sealing of the other end of the protective sleeve 8. Afterwards, the clearance groove 22 can protect the edge of the anti-rotation pin 15 to prevent the anti-rotation pin 15 from being damaged and affecting the stability of the anti-rotation pin 15. The anti-rotation pin 15 can be screwed into the connecting ring 6 and the limiting ring 7 in turn through the clearance groove 22 to position the other end of the protective sleeve 8. In summary, the device is easy to disassemble and maintain, and has good sealing performance.

Claims

1. A metal bellows mechanical sealing device, characterized in that: The invention comprises a positioning seat (9) and a rotating shaft (1), wherein the positioning seat (9) is arranged at one end outside the rotating shaft (1), an adjusting chamber (19) is arranged inside the positioning seat (9), and a slot (13) is arranged at one end of the adjusting chamber (19), a pull rod (20) is arranged inside the adjusting chamber (19), and a pull block (10) is fixed to one end of the pull rod (20), and a push block (12) is fixed to the other end of the pull rod (20), and a spring (18) is connected between one end of the push block (12) and one end of the inner wall of the adjusting chamber (19), A stationary ring (11) is provided on the outside of the rotating shaft (1), and a dynamic ring (2) is provided between the stationary ring (11) and the positioning seat (9); a bellows (4) is provided on the outside of the rotating shaft (1), and a protective sleeve (8) is provided on the outside of the bellows (4); an insert (17) is connected to one end of the protective sleeve (8), and the insert (17) is engaged with the slot (13); a second extrusion support (16) is provided at both ends of the protective sleeve (8), and a first extrusion support (14) is provided on the side of the positioning seat (9) corresponding to the second extrusion support (16).

2. A metal bellows mechanical seal device according to claim 1, characterized in that: A connecting ring (6) is provided at the other end of the outside of the rotating shaft (1), and a third extrusion support (21) is provided on the side of the connecting ring (6).

3. The metal bellows mechanical seal device according to claim 2, characterized in that: A sealing ring 1 (3) is provided between the second extrusion support (16) and the first extrusion support (14) corresponding to the rotating shaft (1), and a sealing ring 2 (5) is provided between the second extrusion support (16) and the third extrusion support (21) corresponding to the rotating shaft (1).

4. A metal bellows mechanical seal device according to claim 3, characterized in that: One end of the protective sleeve (8) is provided with a connecting ring (6) outside the corresponding rotating shaft (1), and a side portion of the connecting ring (6) is provided with a clearance groove (22).

5. The metal bellows mechanical seal device according to claim 4, characterized in that: An anti-rotation pin (15) is provided inside the clearance groove (22), the other end of the protective sleeve (8) is connected to a limiting ring (7), and the side of the limiting ring (7) is threadedly engaged with one end of the anti-rotation pin (15).

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