CN210240097U - Mechanical seal capable of dry rotation for centrifugal pump - Google Patents
Mechanical seal capable of dry rotation for centrifugal pump Download PDFInfo
- Publication number
- CN210240097U CN210240097U CN201920921120.3U CN201920921120U CN210240097U CN 210240097 U CN210240097 U CN 210240097U CN 201920921120 U CN201920921120 U CN 201920921120U CN 210240097 U CN210240097 U CN 210240097U
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- main shaft
- mechanical seal
- end bearing
- ring
- pump cover
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Abstract
The utility model discloses a centrifugal pump is with mechanical seal that can do commentaries on classics, including the main shaft, the suspension, the installation is rotated with the main shaft through drive end bearing and non-drive end bearing in the both ends of suspension, and the outer end of drive end bearing installs the drive end bearing gland that is used for axial positioning, install the impeller on stretching into the main shaft in the pump body, and seal fixedly through the pump cover, install the mechanical seal subassembly between pump cover and the main shaft, the mechanical seal subassembly is including the quiet ring and the rotating ring of mutually supporting, the quiet ring is installed in the pump cover, seal by O type circle between quiet ring and the pump cover, the rotating ring is installed on the main shaft, seal the transmission by rubber spare between rotating ring and the main shaft, and wrap up through the metalwork piece between rotating ring and the rubber spare, the metalwork overcoat is equipped with the spring that is used for compensating the compression volume of mechanical seal, install the link between. The utility model discloses can change futilely, even do not have any lubrication and cooling measure and also can not damage for a long time the operation, the machine seals the life-span longer.
Description
The technical field is as follows:
the utility model relates to a centrifugal pump field mainly relates to a centrifugal pump is with mechanical seal that can do commentaries on classics.
Background art:
when the centrifugal pump operates, a mechanical seal unit and other sealing units are needed to seal a pump cavity to prevent high-pressure media from leaking, the sealing units need to be lubricated and cooled by the media or external cooling liquid, and if the sealing units are not lubricated and cooled when the centrifugal pump operates, the sealing units can rapidly fail, so that the mechanical pump can be damaged. In actual production, the mechanical pump is rarely kept on duty for 24 hours, and particularly, the mobile pump truck is likely to completely dry the medium in field operation and the pump is still in operation. This can quickly cause equipment damage, which can be catastrophic if the pump is subjected to emergency tasks.
The dry-rotating mechanical seal in the prior art is applied to the working condition of complete dry rotation, such as the mechanical seal of a vacuum pump, and the dry-rotating mechanical seal can not contact water at all, so that the dry-rotating mechanical seal can not be used for a centrifugal water pump.
The dynamic and static rings of the existing mechanical seal of the centrifugal water pump are in friction seal under the condition of complete contact, so that the glossiness and parallelism of the sealing end surface are strictly ensured during production, the contact friction can accelerate the abrasion of a friction pair, and the service life of the mechanical seal is shortened.
The utility model has the following contents:
the utility model discloses the purpose is exactly in order to remedy prior art's defect, provides a centrifugal pump with can doing mechanical seal who changes, can do the commentaries on classics, even do not have any lubrication and cooling measure also can not damage for a long time the operation, and the machine seals the life-span longer, and the friction of machine seal is vice to operate under the state of non-contact all the time, has reduced friction loss greatly.
The utility model discloses a realize through following technical scheme:
a dry-running mechanical seal for a centrifugal pump comprises a main shaft, a driving end bearing, a non-driving end bearing, a driving end shaft and a non-driving end shaft, wherein the main shaft is supported and installed in a suspension, and one end of the main shaft extends out to be connected with a prime motor; the method is characterized in that: the utility model discloses a mechanical seal device, including pump cover, suspension, drive end bearing, non-drive end bearing and pump cover, the both ends of suspension are passed through drive end bearing and non-drive end bearing and are installed with the main shaft rotation, and the outer end of drive end bearing installs the drive end bearing gland that is used for axial positioning, stretch into and install the impeller on the main shaft in the pump body, and seal fixedly through the pump cover, install the mechanical seal subassembly between pump cover and the main shaft, the mechanical seal subassembly is including the quiet ring and the rotating ring of mutually supporting, the quiet ring is installed in the pump cover, seal by O type circle between quiet ring and the pump cover, the rotating ring is installed on the main shaft, seals the transmission by rubber spare between rotating ring and the main shaft, and wraps up through the metalwork piece between rotating ring and the rubber spare, the metalwork overcoat is equipped with the spring that.
The metal piece is of a double-layer barrel structure and comprises an inner barrel and an outer barrel which are fixedly connected through a connecting rib plate, the inner barrel is clamped in a clamping groove of the rubber piece, the outer barrel is a step barrel, one end of the step barrel is clamped on the movable ring, and the other end of the step barrel is connected with the inner barrel.
The seal end face of the movable ring is provided with a plurality of spiral grooves arranged at intervals, and the grooves are several micrometers deep and are not conducted from inside to outside.
The friction pair of the mechanical seal is made of hard alloy materials, so that the mechanical seal can contact water and is more competent for sewage media. The sealing rubber on the dynamic and static rings is made of fluororubber and can bear the high temperature of 200 ℃.
The end face of the movable ring of the mechanical seal friction pair, which is in contact with the stationary ring, is provided with a groove with the depth of several micrometers, the groove is spiral from outside to inside and is not completely communicated, the non-communicated part is used for medium sealing during the conventional work of a centrifugal water pump, the grooved part pumps air into the space between the sealing end faces when the mechanical seal is in dry rotation, air forms an air film between the sealing end faces, the pressure of the air film is gradually increased from the outermost side to the inner side of the groove, the pressure of the air film is gradually reduced towards the tail end of the groove at the inner side, and the air film has enough strength to enable the movable ring and the stationary ring of the friction pair to be in a non-contact state, so that the sealing is. When the mechanical seal is in operation with medium, a layer of liquid film is formed on the sealing end face, and the layer of liquid film can also enable the moving and static rings to operate under the condition of non-contact. The mating stationary ring end faces are completely flat.
The utility model has the advantages that:
1. the machine seal can be rotated in a dry mode, and can be operated for a long time without damage even without any lubricating and cooling measures
2. The service life of the mechanical seal is longer, the friction pair of the mechanical seal always runs in a non-contact state, and the friction loss is greatly reduced
3. The continuous running time of the pump is longer, and the performance is more stable
Description of the drawings:
fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a cross-sectional view of the machine seal.
Fig. 3 is a cross-sectional end view of the rotating ring.
The specific implementation mode is as follows:
see the drawings.
A kind of centrifugal pump can dry the rotary mechanical seal, including the basic shaft 4, the said basic shaft 4 is supported and mounted in the suspension 3 by the drive end bearing 2 and non-drive end bearing 5, its one end extends out and is used for connecting the prime mover; the two ends of the suspension 3 are rotatably mounted with the main shaft 4 through a drive end bearing 2 and a non-drive end bearing 5, and the outer end of the drive end bearing 2 is provided with a drive end bearing gland 1 for axial positioning, the main shaft extending into the pump body 10 is provided with an impeller 9, and is sealed and fixed by a pump cover 8, a mechanical seal assembly 7 is arranged between the pump cover 8 and the main shaft 4, the mechanical seal assembly 7 comprises a static ring 12 and a dynamic ring 13 which are matched with each other, the static ring 12 is arranged in the pump cover 8, the static ring 12 and the pump cover 8 are sealed by an O-shaped ring 17, the rotating ring 13 is arranged on the main shaft 4, the rotating ring 13 and the main shaft 4 are in sealed transmission by a rubber part 16, and the movable ring 13 and the rubber part 16 are wrapped by a metal part 14, a spring 15 for compensating the compression amount of the mechanical seal is sleeved outside the metal part 14, and a connecting frame 6 is arranged between the non-driving-end bearing 5 and the pump cover 8.
The metal piece 14 is of a double-layer cylinder structure and comprises an inner cylinder and an outer cylinder which are fixedly connected through a connecting rib plate, the inner cylinder is clamped in a clamping groove of the rubber piece, the outer cylinder is a step cylinder, one end of the cylinder is clamped on the movable ring 13, and the other end of the cylinder is connected with the inner cylinder.
The sealing end face of the movable ring 13 is provided with a plurality of spiral grooves arranged at intervals, and the grooves are several micrometers deep and are not conducted from inside to outside.
In the above structure: the main shaft 4 is supported and installed in the suspension 3 by the driving end bearing 2 and the non-driving end bearing 5, one end of the main shaft extends into the pump body 10 to drive the impeller 9 to rotate in the pump body 10 to do work on the medium, and the other end of the main shaft extends out to be used for connecting a prime motor; the driving end bearing gland 1 is arranged at one side of the suspension 3 to axially position the driving end bearing 2; the connecting frame 6 is arranged between the suspension frame 3 and the pump cover 8, the pump cover 8 is internally provided with the mechanical seal 7, the mechanical seal 7 is axially positioned by the pump cover 8 and the impeller 9 and radially positioned by the main shaft 4, and the movable ring rotates along with the rotation of the main shaft 4; the suction section 11 is installed at one side of the pump body 10 and is used for connecting an inlet pipeline, and a medium enters the pump body 10 from the inlet pipeline and is discharged from an outlet of the pump body 10 by applying work through an impeller.
A static ring 12 of the mechanical seal is arranged in a pump cover 8, the static ring and the pump cover are sealed by an O-shaped ring 17, a rotating ring 13 is arranged on a main shaft 4, the rotating ring 13 and the main shaft 4 are sealed and driven by a rubber part 16, a metal part 14 wraps the rotating ring 13 and the rubber part 16, and a spring 15 is used for compensating the compression amount of the mechanical seal.
The sealing end face of the mechanical sealing ring 13 is provided with a spiral groove with the depth of several micrometers, the groove is not communicated from inside to outside, the inner communicated part is communicated with the atmosphere, and the outer non-communicated part is contacted with a medium. When no medium exists in the pump body 10, a layer of air film exists between the sealing end surfaces of the rotating movable ring 13 and the static ring 12, and the air film supports the movable ring and the static ring to be in a non-contact state, so that the mechanical seal is not burnt out due to violent friction even if the movable ring and the static ring rotate dry. When a medium exists in the pump body 10, a layer of liquid film exists between the sealing end faces, and similarly, the liquid film can also support the sealing end faces to be not contacted, so that the abrasion of the movable ring and the static ring is greatly reduced, and the service life of the mechanical seal is prolonged.
Claims (3)
1. A dry-running mechanical seal for a centrifugal pump comprises a main shaft, a driving end bearing, a non-driving end bearing, a driving end shaft and a non-driving end shaft, wherein the main shaft is supported and installed in a suspension, and one end of the main shaft extends out to be connected with a prime motor; the method is characterized in that: the utility model discloses a mechanical seal device, including pump cover, suspension, drive end bearing, non-drive end bearing and pump cover, the both ends of suspension are passed through drive end bearing and non-drive end bearing and are installed with the main shaft rotation, and the outer end of drive end bearing installs the drive end bearing gland that is used for axial positioning, stretch into and install the impeller on the main shaft in the pump body, and seal fixedly through the pump cover, install the mechanical seal subassembly between pump cover and the main shaft, the mechanical seal subassembly is including the quiet ring and the rotating ring of mutually supporting, the quiet ring is installed in the pump cover, seal by O type circle between quiet ring and the pump cover, the rotating ring is installed on the main shaft, seals the transmission by rubber spare between rotating ring and the main shaft, and wraps up through the metalwork piece between rotating ring and the rubber spare, the metalwork overcoat is equipped with the spring that.
2. A dry-running mechanical seal for a centrifugal pump according to claim 1, wherein: the metal piece is of a double-layer barrel structure and comprises an inner barrel and an outer barrel which are fixedly connected through a connecting rib plate, the inner barrel is clamped in a clamping groove of the rubber piece, the outer barrel is a step barrel, one end of the step barrel is clamped on the movable ring, and the other end of the step barrel is connected with the inner barrel.
3. A dry-running mechanical seal for a centrifugal pump according to claim 1, wherein: the seal end face of the movable ring is provided with a plurality of spiral grooves arranged at intervals, and the grooves are several micrometers deep and are not conducted from inside to outside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920921120.3U CN210240097U (en) | 2019-06-19 | 2019-06-19 | Mechanical seal capable of dry rotation for centrifugal pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920921120.3U CN210240097U (en) | 2019-06-19 | 2019-06-19 | Mechanical seal capable of dry rotation for centrifugal pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210240097U true CN210240097U (en) | 2020-04-03 |
Family
ID=69986482
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920921120.3U Active CN210240097U (en) | 2019-06-19 | 2019-06-19 | Mechanical seal capable of dry rotation for centrifugal pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210240097U (en) |
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2019
- 2019-06-19 CN CN201920921120.3U patent/CN210240097U/en active Active
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