CN218934801U - Energy-saving maintenance-free centrifugal pump - Google Patents
Energy-saving maintenance-free centrifugal pump Download PDFInfo
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- CN218934801U CN218934801U CN202223201991.9U CN202223201991U CN218934801U CN 218934801 U CN218934801 U CN 218934801U CN 202223201991 U CN202223201991 U CN 202223201991U CN 218934801 U CN218934801 U CN 218934801U
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
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Abstract
The utility model discloses an energy-saving maintenance-free centrifugal pump, wherein a power sealing element and a shutdown sealing element are respectively arranged on the inner part and the outer part of a pump body; the power sealing piece comprises auxiliary blades arranged on the back surface of the impeller, an auxiliary impeller chamber which is positioned on the back side of the impeller and arranged on the pump body, and an auxiliary impeller which is positioned in the auxiliary impeller chamber and connected with the shaft sleeve; the shutdown sealing piece is located the pump cover rear side, including cover on the axle sleeve and install quiet ring on the pump cover, cover on the axle sleeve and be located quiet ring rear side moving ring, traction block, the moving ring adopts the metal bellows structure and keeps away from the one end of quiet ring and fix on the axle sleeve, the other end is free, traction block is connected with the moving ring both ends respectively, the moving ring is tightly pasted with the sealed face of quiet ring when shutting down, the centrifugal force that traction block produced pulls the moving ring free end and keeps away from quiet ring during the operation. The centrifugal pump has the advantages of no need of frequent maintenance, low mechanical energy loss, no need of mechanical sealing isolating liquid and high durability to the medium easy to crystallize/scale.
Description
Technical Field
The utility model relates to a centrifugal pump, in particular to an energy-saving maintenance-free centrifugal pump.
Background
The problems of high maintenance probability, low pump efficiency, high mechanical energy loss, high energy medium consumption caused by adopting mechanical seal isolating liquid and the like all the time plagues practitioners when centrifugal pumps are generally adopted in the fields of chemical industry, metallurgy, environmental protection and the like for conveying fluid media, and shaft seals of the centrifugal pumps are frequently burnt out and liquid leakage is caused. Especially when the medium is easy to crystallize, contains solid particles, has higher temperature (higher than 150 ℃), and the like, the shaft seal is easy to damage, thereby causing a large amount of leakage of process medium and influencing the stability of a process system, safety, environmental protection and other factors. Specifically:
1) When the shaft seal adopts the packing seal, the packing seal has low price, simple structure and convenient installation and maintenance, but has short working period and higher leakage rate, and the packing and the shaft sleeve can be worn, so that the leakage probability is increased while extra mechanical energy loss is generated;
2) When the shaft seal adopts a single-end mechanical seal, although the sealing performance is better than that of the packing seal, for a medium containing solid particles, the solid particles easily enter a sealing surface between a dynamic ring and a static ring, so that the sealing surface is unevenly worn until damaged, the service life is shorter, and the single-end mechanical seal is in a semi-liquid friction state and has certain mechanical energy loss when running, but is smaller than that of the packing seal;
3) When the shaft seal adopts double-end mechanical seal, although the sealing performance is better than that of single-end mechanical seal, additional isolating liquid is needed, the energy medium consumption is higher, the requirement on the cleanliness and the pressure of the isolating liquid is higher, and the risk that the isolating liquid leaks into the process medium is also caused. The double-end-face mechanical seal is also in a semi-liquid friction state when in operation, and has certain mechanical energy loss, but is smaller than the packing seal and larger than the single-end-face mechanical seal;
4) When the shaft seal adopts a power seal, the shaft seal can realize effective seal when the pump is in operation, but when the pump is stopped, a large amount of medium is leaked;
5) When the shaft seal adopts the combination of the power seal and the parking seal, the parking seal generally adopts the packing, the coil pipe, the spring seal and the like, so that the sealing performance is poor, and the parking seal is easy to lose efficacy particularly under the conditions that the process medium is easy to crystallize and scale.
Therefore, the existing centrifugal pump is needed to solve the problems that the shaft seal needs to be frequently maintained, the mechanical energy loss is large, the consumption of the isolating liquid energy medium is high, the durability to the medium easy to crystallize/scale is poor, and the like.
Disclosure of Invention
The utility model aims to provide an energy-saving maintenance-free centrifugal pump which is free from frequent maintenance, small in mechanical energy loss, free from mechanical sealing isolating liquid and high in durability on a medium easy to crystallize/scale.
The technical scheme adopted by the utility model is as follows:
an energy-saving maintenance-free centrifugal pump comprises a pump body (1), wherein the front end of the pump body (1) is provided with an inlet, the side part of the pump body is provided with an outlet, the rear end of the pump body is provided with a pump cover (3), a pump shaft (4) which is externally driven and a shaft sleeve (5) on the pump shaft (4) penetrate 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 runner; 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 power sealing piece comprises an auxiliary blade (11) arranged on the back surface of the impeller (2), an auxiliary impeller chamber (12) which is positioned on 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); the shutdown sealing member is located pump cover (3) rear side, including cover on axle sleeve (5) and install quiet ring (15) on pump cover (3), cover on axle sleeve (5) and be located quiet ring (15) rear side moving ring (18), traction block (20), moving ring (18) adopt the metal 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 moving ring (18) both ends respectively, moving ring (18) are closely with the sealed face of quiet ring (15) during shutdown, the centrifugal force that traction block (20) produced pulls moving ring (18) free end and keeps away from quiet ring (15).
Further, 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 of the traction block is connected with the free end of the movable ring (18) through a pull rope or is hinged with the free end of the movable ring (18) through a pull rod (19).
Further, a static ring (15) is arranged 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 moving ring (18) is fixed on a mounting ring through a moving ring screw (17), and the mounting ring is fixed on the shaft sleeve (5).
Further, at least two traction blocks (20) are distributed around the ring (18).
Further, the power seal is provided with one, two or more groups; the shutdown seal is provided with one, two or more sets.
Further, the device also comprises a sealing cover (8) and a purging device (9), wherein the sealing cover (8) surrounds and seals the shutdown sealing piece and the pump shaft (4) and the shaft sleeve (5) which are connected with each other, and the purging device (9) can purge the shutdown sealing piece and the pump shaft (4) and the shaft sleeve (5) which are connected with each other in the sealing cover (8).
Further, the purging medium of the purging device (9) is steam, clean water, compressed air or nitrogen.
Further, the device also comprises a sealing cover (8) and a protection device (10), wherein the sealing cover (8) surrounds and seals the shutdown sealing piece and the pump shaft (4) and the shaft sleeve (5) which are connected, and the protection device (10) can inject protection medium with certain pressure into the sealing cover (8).
Further, the heat-insulating sleeve (7) is used for heating medium in the pump before the pump is started, the heat-insulating sleeve (7) is covered on the pump body (1) and the pump cover (3), and the heat-insulating sleeve (7) is internally filled with heat-insulating medium or is internally provided with a heating component.
The beneficial effects of the utility model are as follows:
the centrifugal pump has the advantages of no need of frequent maintenance, small mechanical energy loss, no need of mechanical sealing isolating liquid and high durability to the medium easy to crystallize/scale, wherein the power sealing piece realizes the sealing during operation: when the auxiliary vane (11) is operated, the back pressure of the impeller (2) can be reduced to enable the axial force of the pump to be in a balanced state, meanwhile, the auxiliary vane (13) rotates in the auxiliary vane chamber (12) to form a negative pressure area, so that medium in the pump cannot pass through the auxiliary vane chamber (12) and the auxiliary vane (13) along the pump shaft (4) to leak, the damage of corrosive, high-temperature and solid particle-containing medium to the rear side part of the auxiliary vane (13) is avoided, and the problem that the free end of the movable ring (18) is pulled away from the static ring (15) by the centrifugal force generated by the traction block (20) is avoided, and the sealing surface abrasion and the mechanical energy loss cannot occur between the two problems; the shutdown seal realizes the seal when shutdown: when the machine is stopped, the sealing surface of the movable ring (18) and the stationary ring (15) are tightly attached, so that the sealing of a butt joint part is realized, meanwhile, the movable ring (18) adopts a metal bellows structure, the high temperature resistance, the end face abrasion resistance are good, the bearing capacity is high, the operation is stable, the elastic metal ring sheet in the movable ring can form labyrinth sealing, the abrasion and corrosion of a medium to the shaft sleeve (5) and the pump shaft (4) are avoided, a sealing ring is not required, the problem of deterioration and failure of the sealing ring under the condition of high temperature (more than 150 ℃) is solved, a mechanical sealing isolation liquid is not required, the friction resistance is reduced, the movable ring has good following property and shock resistance, and the vibration and deflection tolerance to the pump shaft (4) is high. The centrifugal pump has high durability to dangerous media which are easy to crystallize, scale, fixed at normal temperature, inflammable, explosive and the like, and can be widely applied to the fields of chemical industry, metallurgy and environmental protection fluid medium transportation.
Drawings
Fig. 1 is a schematic structural diagram of an energy-saving maintenance-free centrifugal pump in an embodiment of the utility model.
FIG. 2 is a schematic view of a shutdown seal at shutdown in an embodiment of the utility model.
FIG. 3 is a schematic illustration of a shutdown seal in operation in an embodiment of the utility model.
In the figure: 1-a pump body; 2-an impeller; 3-pump cover; 4-pump shaft; 5-shaft sleeve; 6-bearing; 7-heat preservation sleeve; 8-sealing cover; 9-a purge device; 10-protecting device; 11-auxiliary blades; 12-a secondary impeller chamber; 13-a secondary impeller; 14-static ring screws; 15-stationary ring; 16-static ring gaskets; 17-moving ring screws; 18-a moving ring; 19-a pull rod; 20-traction block.
Detailed Description
The utility model is further described below with reference to the drawings and examples.
As shown in fig. 1 to 3, an energy-saving maintenance-free centrifugal pump comprises a pump body 1, wherein the front end of the pump body 1 is provided with an inlet, the side part of the pump body is provided with an outlet, the rear end of the pump body is provided with a pump cover 3, a pump shaft 4 which is externally driven and a shaft sleeve 5 on the pump shaft 4 penetrate 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 runner; 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 power seal piece comprises an auxiliary blade 11 arranged on the back surface of the impeller 2, an auxiliary impeller chamber 12 positioned on the back side of the impeller 2 and arranged on the pump body 1, and an auxiliary impeller 13 positioned in the auxiliary impeller chamber 12 and connected with the shaft sleeve 5; the shutdown sealing member is located pump cover 3 rear side, including cover on axle sleeve 5 and install quiet ring 15 on pump cover 3, cover on axle sleeve 5 and be located quiet ring 15 rear side's rotating ring 18, traction block 20, the rotating ring 18 adopts the metal bellows structure and keep away from quiet ring 15 one end fix on axle sleeve 5, the other end is free, traction block 20 is connected with rotating ring 18 both ends respectively, the sealed face of rotating ring 18 and quiet ring 15 is closely when shutting down, the centrifugal force that traction block 20 produced pulls rotating ring 18 free end and keeps away from quiet ring 15 during the operation.
The centrifugal pump has the advantages of no need of frequent maintenance, small mechanical energy loss, no need of mechanical sealing isolating liquid and high durability to the medium easy to crystallize/scale, wherein the power sealing piece realizes the sealing during operation: when the auxiliary vane 11 is operated, the back pressure of the impeller 2 can be reduced 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 area, so that medium in the pump cannot pass through the auxiliary impeller chamber 12 and the auxiliary impeller 13 along the pump shaft 4 to leak, the damage of corrosive, high-temperature and solid particle-containing medium to the rear side part of the auxiliary impeller 13 is avoided, and the free end of the movable ring 18 is pulled away from the static ring 15 by the centrifugal force generated by the traction block 20, so that the problems of sealing surface abrasion and mechanical energy loss cannot occur between the two; the shutdown seal realizes the seal when shutdown: during shutdown, the sealing surfaces of the movable ring 18 and the stationary ring 15 are tightly adhered to realize the sealing of the butt joint, meanwhile, the movable ring 18 adopts a metal bellows structure, the high temperature resistance, the end face abrasion resistance are good, the bearing capacity is high, the operation is stable, the elastic metal ring sheet in the movable ring can form labyrinth sealing, the abrasion and corrosion of media to the shaft sleeve 5 and the pump shaft 4 are avoided, a sealing ring is not required to be arranged, the problem of deterioration and failure of the sealing ring under the condition that the high temperature is more than 150 ℃ is solved, the mechanical sealing isolation liquid is not required, the friction resistance is reduced, the movable ring has good following property and shock resistance, and the vibration and deflection tolerance to the pump shaft 4 is high. The centrifugal pump has high durability to dangerous media which are easy to crystallize, scale, fixed at normal temperature, inflammable, explosive and the like, and can be widely applied to the fields of chemical industry, metallurgy and environmental protection fluid medium transportation.
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 moving ring 18 away from the stationary ring 15, and the other end is connected to the free end of the moving ring 18 by a pull rope or is hinged to the free end of the moving ring 18 by a pull rod 19. In operation, the centrifugal force generated by the traction block 20 causes the side of the traction block, which is close to the free end of the movable ring 18, to swing in a direction away from the radial direction, and then the free end of the movable ring 18 is pulled away from the stationary ring 15 through the pull rope or the pull rod 19. The weight, size and shape of the traction block 20 are calculated based on the pulling force required to pull the free end of the ring 18 and the transmission path of the force to ensure that the free end of the ring 18 is pulled beyond a certain rotational speed without collapsing the ring 18.
As shown in fig. 1 to 3, in the present embodiment, a stationary ring 15 is mounted on the rear side of a pump cover 3 through a stationary ring spacer 16 and a stationary ring screw 14, one end of a movable ring 18, which is far away from the stationary ring 15, is fixed on a mounting ring through a movable ring screw 17, the mounting ring is fixed on a 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 this embodiment, at least two traction blocks 20 are distributed around the ring 18, and the free end of the ring 18 is pulled away from the stationary ring 15 in a balanced manner during operation.
The power seal is provided with one, two or more groups, the shutdown seal is provided with one, two or more groups, in a word, the number of groups is selected according to the sealing requirement, and the number is not limited to the specific number.
In the present embodiment, as shown in fig. 1, the rear end of the pump shaft 4 is externally driven after being fitted through the bearing 6.
As shown in fig. 1, in this embodiment, the device further includes a sealing cover 8 and a purging device 9, where the sealing cover 8 encloses and seals the shutdown seal and the pump shaft 4 and the shaft sleeve 5 connected to each other, and the purging device 9 can purge the shutdown seal and the pump shaft 4 and the shaft sleeve 5 connected to each other in the sealing cover 8, and the purging medium of the purging device 9 may be steam, clean water, compressed air, nitrogen, or the like. For the medium which is easy to crystallize, scale and sticky and even solid at normal temperature, the sealing environment formed by the sealing cover 8 and the purging function of the purging device 9 are utilized, the shutdown sealing element and the connected pump shaft 4 and the shaft sleeve 5 are purged before the pump is started, the follow-up movable ring 18 is free from the limitation of the medium when moving, the shutdown sealing element and the connected pump shaft 4 and the shaft sleeve 5 are purged when stopping, and the sealing surfaces of the stationary ring 15 and the movable 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 to spray through the pipeline, or high-pressure steam generated by the steam source flows to the spray head through the pipeline and is sprayed, and the valve can control the on-off and flow of the pipeline.
As shown in fig. 1, in this embodiment, the pump further comprises a sealing cover 8 and a protecting device 10, wherein the sealing cover 8 encloses and seals the shutdown seal and the pump shaft 4 and the shaft sleeve 5 which are connected, and the protecting device 10 can inject a protecting medium with a certain pressure into the sealing cover 8. When the sealing element fails, the protection device 10 injects a protection medium with a certain pressure into the sealing cover 8, so that the medium can not leak by utilizing the pressure effect. The protection device 10 adopts a common emergency protection structure, and can be a nitrogen protection device, a bag type energy storage pressureless protection device, a white oil and common energy storage pressureless protection device and the like. The protection device 10 has monitoring and alarming functions, and when the pressure in the sealing cover 8 exceeds a certain pressure, the protection device 10 protects the process medium from leaking outside under the pressure effect of the medium, and alarms in situ and remotely.
As shown in fig. 1, in this embodiment, the pump further comprises a heat insulation sleeve 7 for heating the medium in the pump before the pump is started, the heat insulation sleeve 7 covers the pump body 1 and the pump cover 3, and the heat insulation sleeve 7 is internally filled with heat insulation medium or is internally provided with a heating component. For the medium which is easy to crystallize, scale and sticky and even is solid at normal temperature, the heat insulation sleeve 7 heats the medium in the pump before the pump starts, so that the turning step before the pump starts and the damage of the solid to the internal structural components of the pump body 1 are avoided. The heat preservation medium can be steam, superheated water, heat conducting 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 will be apparent to those skilled in the art from the foregoing description, and it is intended that all such modifications and variations be included within the scope of the following claims.
Claims (9)
1. An energy-saving maintenance-free centrifugal pump comprises a pump body (1), wherein the front end of the pump body (1) is provided with an inlet, the side part of the pump body is provided with an outlet, the rear end of the pump body is provided with a pump cover (3), a pump shaft (4) which is externally driven and a shaft sleeve (5) on the pump shaft (4) penetrate 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 runner; the method is characterized in that: 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 power sealing piece comprises an auxiliary blade (11) arranged on the back surface of the impeller (2), an auxiliary impeller chamber (12) which is positioned on 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); the shutdown sealing member is located pump cover (3) rear side, including cover on axle sleeve (5) and install quiet ring (15) on pump cover (3), cover on axle sleeve (5) and be located quiet ring (15) rear side moving ring (18), traction block (20), moving ring (18) adopt the metal 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 moving ring (18) both ends respectively, moving ring (18) are closely with the sealed face of quiet ring (15) during shutdown, the centrifugal force that traction block (20) produced pulls moving ring (18) free end and keeps away from quiet ring (15).
2. The energy-saving maintenance-free centrifugal pump of claim 1, wherein: 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 of the traction block is connected with the free end of the movable ring (18) through a pull rope or is hinged with the free end of the movable ring (18) through a pull rod (19).
3. The energy-saving maintenance-free centrifugal pump of claim 1, wherein: the static ring (15) is arranged at the rear side of the pump cover (3) through a static ring gasket (16) and a static ring screw (14), one end of the moving ring (18) far away from the static ring (15) is fixed on the mounting ring through a moving ring screw (17), and the mounting ring is fixed on the shaft sleeve (5).
4. The energy-saving maintenance-free centrifugal pump of claim 1, wherein: at least two traction blocks (20) are distributed around the ring (18).
5. The energy-saving maintenance-free centrifugal pump of claim 1, wherein: the power sealing element is provided with one group, two groups or a plurality of groups; the shutdown seal is provided with one, two or more sets.
6. An energy-saving maintenance-free centrifugal pump according to any one of claims 1 to 5, characterized in that: the sealing device is characterized by further comprising a sealing cover (8) and a purging device (9), wherein the sealing cover (8) surrounds and seals the shutdown sealing element and the pump shaft (4) and the shaft sleeve (5) which are connected with each other, and the purging device (9) can purge the shutdown sealing element and the pump shaft (4) and the shaft sleeve (5) which are connected with each other in the sealing cover (8).
7. The energy-saving maintenance-free centrifugal pump of claim 6, wherein: the purging medium of the purging device (9) is steam, clean water, compressed air or nitrogen.
8. An energy-saving maintenance-free centrifugal pump according to any one of claims 1 to 5, characterized in that: the hydraulic pump further comprises a sealing cover (8) and a protection device (10), wherein the sealing cover (8) surrounds and seals the shutdown sealing piece and the pump shaft (4) and the shaft sleeve (5) which are connected with each other, and the protection device (10) can inject protection medium with certain pressure into the sealing cover (8).
9. An energy-saving maintenance-free centrifugal pump according to any one of claims 1 to 5, characterized in that: the novel heat-insulating pump further comprises a heat-insulating sleeve (7) for heating medium in the pump before the pump is started, the heat-insulating sleeve (7) is covered on the pump body (1) and the pump cover (3), and the heat-insulating sleeve (7) is internally filled with heat-insulating medium or is internally provided with a heating component.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223201991.9U CN218934801U (en) | 2022-11-30 | 2022-11-30 | Energy-saving maintenance-free centrifugal pump |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223201991.9U CN218934801U (en) | 2022-11-30 | 2022-11-30 | Energy-saving maintenance-free centrifugal pump |
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| Publication Number | Publication Date |
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| CN218934801U true CN218934801U (en) | 2023-04-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202223201991.9U Active CN218934801U (en) | 2022-11-30 | 2022-11-30 | Energy-saving maintenance-free centrifugal pump |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116498593A (en) * | 2023-05-11 | 2023-07-28 | 甘肃莱德尔流体节能科技开发有限公司 | Three-phase flow magnetic pump capable of carrying particles and small amount of gas in idle load |
-
2022
- 2022-11-30 CN CN202223201991.9U patent/CN218934801U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116498593A (en) * | 2023-05-11 | 2023-07-28 | 甘肃莱德尔流体节能科技开发有限公司 | Three-phase flow magnetic pump capable of carrying particles and small amount of gas in idle load |
| CN116498593B (en) * | 2023-05-11 | 2024-05-24 | 甘肃莱德尔流体节能科技开发有限公司 | Three-phase flow magnetic pump capable of carrying particles and small amount of gas in idle load |
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