CN218760570U - Centrifugal pump stop sealing element - Google Patents
Centrifugal pump stop sealing element Download PDFInfo
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- CN218760570U CN218760570U CN202223250757.5U CN202223250757U CN218760570U CN 218760570 U CN218760570 U CN 218760570U CN 202223250757 U CN202223250757 U CN 202223250757U CN 218760570 U CN218760570 U CN 218760570U
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Abstract
The utility model discloses a centrifugal pump shut-down sealing member, be located pump cover (3) rear side of centrifugal pump, including cover on axle sleeve (5) of centrifugal pump and install quiet ring (15) on pump cover (3), cover on axle sleeve (5) and be located quiet ring (15) rear side rotating ring (18), traction block (20), rotating ring (18) adopt the corrugated metal pipe structure and keep away from the one end of quiet ring (15) and fix on axle sleeve (5), the other end is free, traction block (20) are connected with rotating ring (18) both ends respectively, rotating ring (18) are pasted tightly with the sealed face of quiet ring (15) when shutting down, the centrifugal force pulling rotating ring (18) free end that traction block (20) produced when operation keeps away from quiet ring (15). The problems of abrasion of a sealing surface and mechanical energy loss can not occur during operation, sealing is realized during shutdown, abrasion and corrosion of a shaft sleeve and a pump shaft by a medium are avoided, a sealing ring is not required to be arranged, and a mechanical seal isolation liquid is not required.
Description
Technical Field
The utility model relates to a centrifugal pump seal structure, concretely relates to centrifugal pump shuts down sealing member.
Background
The centrifugal pump is generally adopted in the fields of chemical industry, metallurgy, environmental protection and the like when fluid media are conveyed, the shaft seal of the centrifugal pump is frequently burnt out, the maintenance probability caused by liquid leakage is higher, the pump efficiency is not high, the mechanical energy loss is large, and the problems of large energy medium consumption and the like caused by adopting a mechanical seal isolation liquid always trouble practitioners. Especially, when the medium is easy to crystallize, contains solid particles, and has high temperature (more than 150 ℃), the shaft seal is easy to damage, thereby causing a large amount of process medium leakage, affecting the factors of process system stability, safety, environmental protection and the like. Specifically, the method comprises the following steps: when the shaft seal adopts dynamic seal, an auxiliary impeller in the pump rotates in an auxiliary impeller chamber to form a negative pressure region, so that a medium in the pump cannot cross the auxiliary impeller chamber and the auxiliary impeller along a pump shaft to generate leakage, although the effective seal can be realized during the operation of the pump, when the pump is stopped, a large amount of medium can be leaked; when the shaft seal is combined with the parking seal, the existing parking seal generally adopts packing, a coil pipe, a spring type seal and the like, the sealing performance is poor, especially the parking seal is easy to lose efficacy under the conditions that a process medium is easy to crystallize and scale, and a mechanical seal isolation liquid needs to be arranged. Therefore, a shutdown sealing element is needed, which is matched with a dynamic seal for use, ensures that the shutdown sealing element can be sealed, does not need a mechanical seal isolation liquid, and does not generate abrasion during operation.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a centrifugal pump shuts down sealing member, the problem of sealed face wearing and tearing, mechanical energy loss can not take place during the operation, has realized sealedly when shutting down, has avoided the medium to wearing and tearing, the corruption of axle sleeve and pump shaft, need not to set up the sealing washer, does not need the machine to seal the buffer fluid.
The utility model adopts the technical proposal that:
the utility model provides a centrifugal pump shut down sealing member, be located pump cover (3) rear side of centrifugal pump, including cover on axle sleeve (5) of centrifugal pump and install quiet ring (15) on pump cover (3), cover rotating ring (18) that just is located quiet ring (15) rear side on axle sleeve (5), traction block (20), rotating ring (18) adopt the corrugated metal pipe structure and keep away from the one end of quiet ring (15) and fix on axle sleeve (5), the other end is free, traction block (20) are connected with rotating ring (18) both ends respectively, rotating ring (18) are pasted tightly with the sealed face of quiet ring (15) when shutting down, the centrifugal force pulling rotating ring (18) the free end that traction block (20) produced when operation keeps away from quiet ring (15).
Furthermore, one end of the traction block (20) is hinged with one end of the movable ring (18) far away from the static ring (15), and the other end of the traction block is connected with the free end of the movable ring (18) through a pull rope.
Furthermore, one end of the traction block (20) is hinged with one end of the movable ring (18) far away from the stationary ring (15), and the other end is hinged with the free end of the movable ring (18) through a pull rod (19).
Furthermore, a static ring (15) is installed on the rear side of the pump cover (3) through a static ring gasket (16) and a static ring screw (14), one end, far away from the static ring (15), of a movable ring (18) is fixed on an installation ring through a movable ring screw (17), and the installation ring is fixed on the shaft sleeve (5).
Furthermore, at least two traction blocks (20) are distributed around the ring (18).
Further, the shutdown sealing element is provided with one group, two groups or more groups.
The utility model has the advantages that:
the shutdown sealing element is matched with a power seal for use, when the shutdown sealing element operates, the power seal enables a medium in a pump not to cross a secondary impeller chamber (12) and a secondary impeller (13) along a pump shaft (4) to generate leakage, in addition, the centrifugal force generated by a traction block (20) pulls the free end of a movable ring (18) to be far away from a static ring (15), the problems of seal surface abrasion and mechanical energy loss cannot occur between the two, when the shutdown sealing element operates, the movable ring (18) is tightly attached to the seal surface of the static ring (15), the sealing of a butt joint is realized, meanwhile, the movable ring (18) adopts a metal corrugated pipe structure, the high temperature resistance, the end surface abrasion resistance performance is good, the bearing capacity is large, the operation is stable, an elastic metal ring sheet in the shutdown sealing element can form labyrinth seal, the abrasion and the corrosion of the medium to a shaft sleeve (5) and the pump shaft (4) are avoided, no sealing ring is required to be arranged, the problem of the deterioration failure of the sealing ring under the condition that the temperature is higher than 150 ℃ is solved, the mechanical seal isolating liquid is not required, the friction resistance is reduced, the tracking performance and the shock resistance are good, and the shock tolerance to the pump shaft (4) is large.
Drawings
Fig. 1 is a schematic structural diagram of a centrifugal pump in combination with a shutdown sealing element and a dynamic sealing element in the embodiment of the present invention.
Fig. 2 is a schematic view of the shutdown sealing member in the embodiment of the present invention at shutdown.
Fig. 3 is a schematic diagram of the shutdown seal in operation according to an embodiment of the present invention.
In the figure: 1-a pump body; 2-an impeller; 3-pump cover; 4-a pump shaft; 5-shaft sleeve; 6-a bearing; 7-insulating sleeve; 8-sealing cover; 9-a purging device; 10-a protection device; 11-secondary blades; 12-a counter-impeller chamber; 13-a secondary impeller; 14-a stationary ring screw; 15-stationary ring; 16-stationary ring gasket; 17-a rotating ring screw; 18-a moving ring; 19-a pull rod; 20-a traction block.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
As shown in fig. 1 to 3, in order to match with a conventional power sealing element and the centrifugal pump of the shutdown sealing element disclosed by the present invention, the centrifugal pump comprises a pump body 1, wherein the front end of the pump body 1 is provided with an inlet, the side part is provided with an outlet, the rear end is provided with a pump cover 3, an externally-connected driving pump shaft 4 and a shaft sleeve 5 on the pump shaft 4 pass through the pump cover 3 to enter the pump body 1, and the front end of the pump shaft 4 is provided with an impeller 2 with a guide flow channel; the inner part and the outer part of the pump body 1 are respectively provided with a power sealing element and a stop sealing element; the dynamic sealing element comprises an auxiliary blade 11 arranged on the back of the impeller 2, an auxiliary impeller chamber 12 which is positioned at the back side of the impeller 2 and is arranged on the pump body 1, and an auxiliary impeller 13 which is positioned in the auxiliary impeller chamber 12 and is connected with the shaft sleeve 5; shut down the sealing member and be located pump cover 3 rear side, including the quiet ring 15 of cover on shaft sleeve 5 and installing on pump cover 3, the cover is on shaft sleeve 5 and be located the rotating ring 18 of quiet ring 15 rear side, traction block 20, the rotating ring 18 adopts the corrugated metal pipe structure and keeps away from the one end of quiet ring 15 and fixes on shaft sleeve 5, the other end is free, traction block 20 is connected with rotating ring 18 both ends respectively, rotating ring 18 pastes tightly with the sealed face of quiet ring 15 during the shut down, centrifugal force pulling rotating ring 18 free end that traction block 20 produced during the operation keeps away from quiet ring 15.
This centrifugal pump need not frequent maintenance, mechanical energy loss is little, do not need the machine to seal the buffer solution, to easy crystallization/scale deposit medium durability height, wherein, the power seal spare has realized the sealed of when moving: when the centrifugal pump runs, the auxiliary blade 11 can reduce the pressure on the back of the impeller 2 to enable the axial force of the pump to be in a balanced state, meanwhile, the auxiliary impeller 13 rotates in the auxiliary impeller chamber 12 to form a negative pressure region, so that a medium in the pump cannot cross the auxiliary impeller chamber 12 and the auxiliary impeller 13 along the pump shaft 4 to generate leakage, the damage of corrosive, high-temperature and solid particle-containing media to the back side part of the auxiliary impeller 13 is avoided, in addition, the centrifugal force generated by the traction block 20 pulls the free end of the movable ring 18 to be far away from the static ring 15, and the problems of seal surface abrasion and mechanical energy loss cannot occur between the two parts; the shutdown sealing element realizes the sealing during shutdown: when the machine is stopped, the movable ring 18 is tightly attached to the sealing surface of the static ring 15, the sealing of the butt joint is realized, meanwhile, the movable ring 18 adopts a metal corrugated pipe structure, the high temperature resistance, the end surface wear resistance performance and the bearing capacity are good, the operation is stable, the elastic metal ring sheet in the movable ring 18 can form labyrinth sealing, the abrasion and the corrosion of a medium to the shaft sleeve and the pump shaft are avoided, a sealing ring is not required to be arranged, the problem that the sealing ring is deteriorated and invalid under the condition that the high temperature is higher than 150 ℃ is solved, machine seal isolation liquid is not required, the friction resistance is reduced, the machine seal sealing machine has good followability and shock resistance, and the tolerance to the vibration and deflection of the pump shaft 4 is large. The centrifugal pump has high durability to dangerous media which are easy to crystallize and scale, are fixed at normal temperature, are inflammable and explosive and the like, and can be widely applied to the field of chemical industry, metallurgy and environmental-friendly fluid medium conveying.
As shown in fig. 1 to 3, in the present embodiment, one end of the traction block 20 is hinged to one end of the movable ring 18 away from the stationary ring 15, and the other end is connected to the free end of the movable ring 18 through a pull rope or hinged to the free end of the movable ring 18 through a pull rod 19. In operation, the side of the drag block 20 near the free end of the rotating ring 18 is swung away from the radial direction by the centrifugal force generated by the drag block, and the free end of the rotating ring 18 is pulled away from the stationary ring 15 by the pull rope or rod 19. The weight, size and shape of the pull block 20 is designed based on the pulling force required to pull the free end of the rotating ring 18 and the transmission path of the force to ensure that the free end of the rotating ring 18 can be pulled and the rotating ring 18 is not excessively compressed when a certain rotating speed is exceeded.
As shown in fig. 1 to 3, in the present embodiment, the stationary ring 15 is mounted on the rear side of the pump cover 3 through a stationary ring gasket 16 and stationary ring screws 14, one end of the movable ring 18 away from the stationary ring 15 is fixed on the mounting ring through a movable ring screw 17, the mounting ring is fixed on the shaft sleeve 5, and the mounting manner of the stationary ring 15 and the movable ring 18 is simple and reliable.
As shown in fig. 1 to 3, in the present embodiment, at least two traction blocks 20 are distributed around the rotating ring 18, and the free end of the rotating ring 18 is equally pulled away from the stationary ring 15 during operation.
The dynamic sealing elements are provided with one group, two groups or a plurality of groups, and the shutdown sealing elements are provided with one group, two groups or a plurality of groups.
In this embodiment, as shown in fig. 1, the rear end of the pump shaft 4 is fitted through the bearing 6 and externally driven.
As shown in fig. 1, in the present embodiment, the present invention further includes a sealing cover 8 and a purging device 9, the sealing cover 8 encloses and seals the shutdown seal and the connected pump shaft 4 and shaft sleeve 5, the purging device 9 can purge the shutdown seal and the connected pump shaft 4 and shaft sleeve 5 in the sealing cover 8, and a purging medium of the purging device 9 may be steam, clean water, compressed air, nitrogen gas, or the like. For a medium which is easy to crystallize, scale and viscous and even is solid at normal temperature, the sealing environment formed by the sealing cover 8 and the purging function of the purging device 9 are utilized to purge the shutdown sealing element, the pump shaft 4 and the shaft sleeve 5 which are connected before the pump is started, so that the subsequent moving ring 18 is not limited by the medium when moving, and the shutdown sealing element, the pump shaft 4 and the shaft sleeve 5 which are connected are purged when the pump is stopped, so that the sealing surfaces of the static ring 15 and the moving ring 18 are clean and tightly attached. The purging device 9 adopts a common structure and comprises a pipeline, a spray head, a valve, a pressure pump and a steam source/water source, wherein the pressure pump pressurizes a medium in the water source to the spray head through the pipeline for spraying, or high-pressure steam generated by the steam source flows to the spray head through the pipeline and is sprayed out, and the valve can control the opening and closing and the flow of the pipeline.
As shown in fig. 1, in the present embodiment, the present invention further includes a seal cover 8 and a protector 10, the seal cover 8 encloses and seals the shutdown seal and the connected pump shaft 4 and shaft sleeve 5, and the protector 10 can inject a protective medium under a certain pressure into the seal cover 8. For harmful media such as high temperature, toxicity, flammability, explosive and the like, when the sealing element is invalid, protective media with certain pressure are injected into the sealing cover 8 through the protective device 10, and the media can not leak by utilizing the pressure action. The protection device 10 adopts a common emergency protection structure and can be a nitrogen protection device, a bag type energy storage pressure protection device, a white oil and common energy storage pressure-free protection device and the like. The protection device 10 has monitoring and alarming functions, when the pressure in the sealing cover 8 is monitored to exceed a certain pressure, the process medium is protected from leakage under the action of the medium pressure in the protection device 10, and local and remote alarming is carried out.
As shown in fig. 1, in this embodiment, the pump further includes a thermal insulation sleeve 7 for heating the medium in the pump before the pump is driven, the thermal insulation sleeve 7 covers the pump body 1 and the pump cover 3, and the thermal insulation sleeve 7 is internally filled with the thermal insulation medium or is internally provided with a heating assembly. For a medium which is easy to crystallize, scale and viscous and even is solid at normal temperature, the heat-insulating sleeve 7 heats the medium in the pump before the pump is started, and the turning step before starting and the damage of the solid to the internal structural part of the pump body 1 are avoided. The heat preservation medium can be steam, superheated water, heat conduction oil and the like, and the heating component can be a heating wire, a heating sheet and the like.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are considered to be within the scope of the invention as defined by the following claims.
Claims (6)
1. A centrifugal pump shutdown seal, characterized by: be located pump cover (3) rear side of centrifugal pump, including cover on axle sleeve (5) of centrifugal pump and install quiet ring (15) on pump cover (3), cover rotating ring (18) on axle sleeve (5) and be located quiet ring (15) rear side, traction block (20), rotating ring (18) adopt the bellows structure and keep away from the one end of quiet ring (15) and fix on axle sleeve (5), the other end is free, traction block (20) are connected with rotating ring (18) both ends respectively, rotating ring (18) paste tightly with the sealed face of quiet ring (15) when shutting down, the centrifugal force that traction block (20) produced during operation stimulates rotating ring (18) free end and keeps away from quiet ring (15).
2. A centrifugal pump shutdown seal as recited in claim 1, wherein: one end of the traction block (20) is hinged with one end of the movable ring (18) far away from the static ring (15), and the other end of the traction block is connected with the free end of the movable ring (18) through a pull rope.
3. A centrifugal pump shutdown seal as recited in claim 1, wherein: one end of the traction block (20) is hinged with one end of the movable ring (18) far away from the static ring (15), and the other end is hinged with the free end of the movable ring (18) through a pull rod (19).
4. A centrifugal pump shutdown seal as recited in claim 1, wherein: the static ring (15) is installed on the rear side of the pump cover (3) through a static ring gasket (16) and a static ring screw (14), one end, far away from the static ring (15), of the movable ring (18) is fixed on the installation ring through a movable ring screw (17), and the installation ring is fixed on the shaft sleeve (5).
5. A centrifugal pump shutdown seal as recited in claim 1, wherein: at least two traction blocks (20) are distributed around the ring (18).
6. A centrifugal pump shutdown seal as recited in claim 1, wherein: the shutdown sealing element is provided with one group, two groups or a plurality of groups.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223250757.5U CN218760570U (en) | 2022-11-30 | 2022-11-30 | Centrifugal pump stop sealing element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223250757.5U CN218760570U (en) | 2022-11-30 | 2022-11-30 | Centrifugal pump stop sealing element |
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| Publication Number | Publication Date |
|---|---|
| CN218760570U true CN218760570U (en) | 2023-03-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223250757.5U Active CN218760570U (en) | 2022-11-30 | 2022-11-30 | Centrifugal pump stop sealing element |
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| CN (1) | CN218760570U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024113593A1 (en) * | 2022-11-30 | 2024-06-06 | 中冶南方工程技术有限公司 | Energy-saving maintenance-free centrifugal pump |
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2022
- 2022-11-30 CN CN202223250757.5U patent/CN218760570U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024113593A1 (en) * | 2022-11-30 | 2024-06-06 | 中冶南方工程技术有限公司 | Energy-saving maintenance-free centrifugal pump |
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