CN220227265U - Mechanical sealing device for cryopump - Google Patents
Mechanical sealing device for cryopump Download PDFInfo
- Publication number
- CN220227265U CN220227265U CN202321908175.3U CN202321908175U CN220227265U CN 220227265 U CN220227265 U CN 220227265U CN 202321908175 U CN202321908175 U CN 202321908175U CN 220227265 U CN220227265 U CN 220227265U
- Authority
- CN
- China
- Prior art keywords
- ring
- corrugated pipe
- rotating shaft
- movable ring
- movable
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000007789 sealing Methods 0.000 title claims abstract description 41
- 230000003068 static effect Effects 0.000 claims abstract description 16
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 239000012530 fluid Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
Landscapes
- Mechanical Sealing (AREA)
Abstract
The utility model relates to a mechanical sealing device for a low-temperature pump, which comprises a movable ring, a stationary ring and a corrugated pipe, wherein the movable ring, the stationary ring and the corrugated pipe are arranged on a pump body rotating shaft; the movable ring is sleeved on the rotating shaft through a bushing; the static ring is arranged on the rotating shaft, and the static ring is attached to the surface of the movable ring; a throttle ring is arranged on the diameter surface of the rotating shaft; one end of the corrugated pipe is tightly attached to the stationary ring, and the other end of the corrugated pipe is connected with the pump body; a sealing ring is sleeved at the end part of the corrugated pipe; the movable ring is provided with a microscopic groove; the microscopic grooves arranged on the movable ring of the device can effectively reduce the temperature difference between the inside and outside of the mechanical seal and avoid damage.
Description
Technical Field
The utility model belongs to the technical field of mechanical sealing, and particularly relates to a mechanical sealing device for a low-temperature pump.
Background
The mechanical seal means a device for preventing leakage of fluid, which is formed by at least one pair of end surfaces perpendicular to the rotation axis, which are kept in engagement and relatively slide under the action of fluid pressure and elasticity (or magnetic force) of a compensating mechanism and auxiliary seal, because the transmission shaft penetrates inside and outside the device, a circumferential gap exists between the shaft and the device, medium in the device leaks outwards through the gap, and if the pressure in the device is lower than the atmospheric pressure, air leaks into the device, so that a shaft seal device for preventing leakage is necessary.
The prior Chinese patent publication No. CN209990915U designs a mechanical sealing device, which comprises a stationary ring component and a movable ring component arranged at one end of the stationary ring component; the mechanical sealing device disclosed by the technical scheme has good sealing performance and improves the reliability of the device; but there is also a great deal of heat generated by friction between the rotating shaft and the dynamic and static rings in the working process, so that the local temperature difference is overlarge, and the mechanical sealing device is deformed, so that the sealing performance of the device is affected.
Disclosure of Invention
The utility model provides a mechanical sealing device for a low-temperature pump, which aims to solve the technical problems that the mechanical sealing device deforms and the sealing performance of the device is affected due to overlarge local temperature difference caused by a large amount of heat generated by friction between a rotating shaft and a dynamic ring and a static ring in the working process.
The technical scheme of the utility model is as follows:
the mechanical sealing device for the cryopump comprises a movable ring, a stationary ring and a corrugated pipe, wherein the movable ring, the stationary ring and the corrugated pipe are arranged on a pump body rotating shaft; the movable ring is sleeved on the rotating shaft through a bushing; the static ring is arranged on the rotating shaft, and the static ring is attached to the surface of the movable ring; a throttle ring is arranged on the diameter surface of the rotating shaft; one end of the corrugated pipe is tightly attached to the stationary ring, and the other end of the corrugated pipe is connected with the pump body; a sealing ring is sleeved at the end part of the corrugated pipe; the movable ring is provided with a microscopic groove.
Further, the end of the bellows has a stop that prevents the seal ring from being disengaged from the bellows.
Furthermore, the shape of the sealing ring is O-shaped.
Further, a moving ring gasket is arranged between the moving ring and the rotating shaft.
Further, a flat pad is arranged between the movable ring and the corrugated pipe.
Further, the pump body is fixedly connected with the sealing device body through a screw.
Further, a support ring is arranged between the stationary ring and the corrugated pipe.
The utility model has the following beneficial effects: the utility model provides a mechanical sealing device for a low-temperature pump, wherein a micro groove is formed in a movable ring, so that the temperature difference between the inside and the outside of the mechanical seal is effectively reduced; the end part of the corrugated pipe is sleeved with a sealing ring, so that the sealing performance of the device is improved, the abrasion is reduced, and the service life of the device is prolonged.
Drawings
Fig. 1 is a schematic overall structure of an embodiment of the present utility model.
FIG. 2 is a schematic view of microscopic grooves on a moving ring according to an embodiment of the present utility model.
The reference numerals in the drawings are as follows:
1. a moving ring; 2. a stationary ring; 3. a bellows; 4 a throttle ring; 5. a bushing; 6. a support ring; 7. a flat pad; 8. a sealing ring 9, a movable ring gasket; 10. cross groove countersunk head screw; 11. a microscopic groove; 12. a rotating shaft.
Detailed Description
The utility model will now be described in detail with reference to the drawings and to specific embodiments.
Referring to fig. 1-2, in an embodiment of the present utility model, the pump comprises a moving ring 1, a stationary ring 2 and a bellows 3, which are disposed on a pump body rotating shaft 12; the movable ring 1 is sleeved on the rotating shaft 12 through a bushing 5; the static ring 2 is arranged on the rotating shaft 12, and the static ring 2 is attached to the surface of the movable ring 1; the diameter surface of the rotating shaft 12 is provided with a throttling ring 4; one end of the corrugated pipe 3 is tightly attached to the stationary ring 2, and the other end of the corrugated pipe 3 is connected with the pump body; a sealing ring 8 is sleeved at the end part of the corrugated pipe 3; the moving ring 1 is provided with microscopic grooves 11.
When the device works, liquid nitrogen is stored in the pump body, the movable ring 1 is limited between the impeller side and the shaft shoulder of the rotating shaft 12, and the stationary ring 2 is contacted with the end face of the movable ring 1; the movable ring 1 can move freely in the axial direction and keeps continuous contact with the stationary ring 2; the movable ring 1 and the static ring 2 are tightly compressed together by the corrugated pipe 3, and when the movable ring 1 moves axially, the corrugated pipe 3 compensates displacement automatically so as to ensure the tight contact between the movable ring and the static ring 2, so that the movable ring 1 and the static ring 2 are always attached; in the stationary condition, the ground end faces of the moving ring 1 and the stationary ring 2 are in mechanical contact, and when the rotating shaft 12 rotates, a complex friction action occurs between the end faces and the sealed fluid; under normal conditions, the temperature of liquid nitrogen is very low, heat is generated by friction of the movable ring 1 and the static ring 2, and materials between the inside and the outside of the sealing device generate temperature difference and deform, so that the sealing surface is uneven; the number of the groups of micro grooves 11 arranged on the section of the movable ring 1, which is in contact with the static ring 2, is six or eight, gaps are uniformly formed in the movable ring 1, nitrogen in the pump body can be filled in the micro grooves 11, the nitrogen is used as a cooling medium, and the nitrogen is neutralized with heat generated by friction, so that the temperature difference inside and outside the sealing device is maintained in a stable state. The sealing material will not deform, the tightness of the device will not be affected, and leakage will not be caused.
In a further embodiment of the utility model, the end of the bellows 3 is provided with a stop for preventing the sealing ring 8 from being separated from the bellows 3; the stop block prevents the sealing ring 8 from falling off, and plays a role in keeping sealing.
In a further embodiment of the present utility model, the shape of the sealing ring 8 is an O-shape. The O-shaped sealing ring 8 plays an auxiliary sealing role, and the sealing ring 8 is arranged at the connecting position of the corrugated pipe 3 and the static ring 2, so that radial sealing and buffering roles can be played, and the whole sealing is free from rigid contact in the radial direction.
Referring to fig. 1, in a further embodiment of the present utility model, a moving ring gasket 9 is disposed between the moving ring 1 and the rotating shaft 12; the movable ring gasket 9 improves the tightness of the device and avoids leakage.
Referring to fig. 1, in a further embodiment of the present utility model, a flat pad 7 is disposed between the moving ring 1 and the bellows 3. The corrugated pipe 3 is contacted with the movable ring 1 through the flat pad 7, so that the contact surface is larger and the force is more uniform; and better compensation and sealing effects are achieved.
Referring to fig. 1, in a further embodiment of the present utility model, the pump body is fixedly connected to the sealing device body by a screw. The pump body and the mechanical sealing device are fixed through the cross-shaped groove countersunk head screw 10, so that the structure is more stable.
Referring to fig. 1, in a further embodiment of the present utility model, a support ring 6 is disposed between the stationary ring 2 and the bellows 3. The supporting ring 6 plays a supporting and guiding role.
The foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present utility model.
Claims (7)
1. A mechanical seal for a cryopump, comprising: the device comprises a movable ring, a stationary ring and a corrugated pipe which are arranged on a pump body rotating shaft; the movable ring is sleeved on the rotating shaft through a bushing; the static ring is arranged on the rotating shaft, and the static ring is attached to the surface of the movable ring; a throttle ring is arranged on the diameter surface of the rotating shaft; one end of the corrugated pipe is tightly attached to the stationary ring, and the other end of the corrugated pipe is connected with the pump body; a sealing ring is sleeved at the end part of the corrugated pipe; the movable ring is provided with a microscopic groove.
2. The mechanical seal for a cryopump of claim 1, wherein: the bellows end has a stop that prevents the seal ring from disengaging from the bellows.
3. The mechanical seal for a cryopump of claim 1, wherein: the shape of the sealing ring is O-shaped.
4. The mechanical seal for a cryopump of claim 1, wherein: and a movable ring gasket is arranged between the movable ring and the rotating shaft.
5. The mechanical seal for a cryopump of claim 1, wherein: a flat pad is arranged between the movable ring and the corrugated pipe.
6. The mechanical seal for a cryopump of claim 1, wherein: the pump body is fixedly connected with the sealing device body through screws.
7. The mechanical seal for a cryopump of claim 1, wherein: a support ring is arranged between the stationary ring and the corrugated pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321908175.3U CN220227265U (en) | 2023-07-20 | 2023-07-20 | Mechanical sealing device for cryopump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321908175.3U CN220227265U (en) | 2023-07-20 | 2023-07-20 | Mechanical sealing device for cryopump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220227265U true CN220227265U (en) | 2023-12-22 |
Family
ID=89195078
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321908175.3U Active CN220227265U (en) | 2023-07-20 | 2023-07-20 | Mechanical sealing device for cryopump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220227265U (en) |
-
2023
- 2023-07-20 CN CN202321908175.3U patent/CN220227265U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |