CN217233812U - Circulating water pump for secondary circulating cooling water system of nuclear power station - Google Patents
Circulating water pump for secondary circulating cooling water system of nuclear power station Download PDFInfo
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- CN217233812U CN217233812U CN202123117874.XU CN202123117874U CN217233812U CN 217233812 U CN217233812 U CN 217233812U CN 202123117874 U CN202123117874 U CN 202123117874U CN 217233812 U CN217233812 U CN 217233812U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The utility model discloses a circulating water pump for nuclear power station secondary circulating cooling water system, including the runner that intakes, spiral case runner, pump basis and the pump body, the pump body includes motor, gear box, pump shaft, pump cover, guide bearing, manger plate circle, axle sleeve, impeller, main shaft seal assembly, gasbag seal assembly and protection casing, intake runner, spiral case runner and pump basis are formed by the whole pouring of reinforced concrete of resistant sea water, pump basis, spiral case runner and intake runner set gradually from top to bottom; the inner wall surfaces of the volute flow channel and the water inlet flow channel are respectively provided with a metal lining; the motor is arranged on the top surface of the pump foundation, and the gear box is connected with the lower end of an output shaft of the motor. The utility model discloses a circulating water pump for nuclear power station secondary circulating cooling water system adopts the water inlet runner and the spiral case runner that are provided with the metal lining, has strengthened the resistant scouring performance of runner, has satisfied the demand of secondary circulating cooling water system low discharge high lift, has improved circulating water pump's life.
Description
Technical Field
The utility model relates to a circulating water pump for nuclear power station secondary recirculating cooling water system.
Background
Referring to fig. 1, a circulating water pump 1 'in a secondary circulating cooling water system of a nuclear power plant is used for supplying necessary cooling water to a condenser and an auxiliary cooling water system 2' of a turbine, and the heated cooling water is sent to a cooling tower 3 'through a pressure pipeline and finally returned to a cooling tower return water tank 4'.
The traditional circulating water pump generally adopts a water inlet flow channel and a volute flow channel which are made of concrete, the scouring resistance performance is poor, the requirement of a secondary circulating cooling water system for low flow and high lift cannot be met, and the service life of the whole circulating water pump is short.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming prior art's defect, providing a circulating water pump for nuclear power station secondary circulating cooling water system, adopting the water inlet runner and the spiral case runner that are provided with the metal lining, having strengthened the resistant scouring performance of runner, satisfied the demand of secondary circulating cooling water system low discharge height lift, improved circulating water pump's life.
The technical scheme for realizing the purpose is as follows: the utility model provides a circulating water pump for nuclear power station secondary circulating cooling water system, includes into water flow channel, spiral case runner, pump basis and pump body, the pump body includes motor, gear box, pump shaft, pump cover, guide bearing, manger plate circle, axle sleeve, impeller, main shaft seal subassembly, gasbag seal subassembly and protection casing, wherein:
the water inlet flow channel, the volute flow channel and the pump foundation are integrally cast by seawater-resistant reinforced concrete, and the pump foundation, the volute flow channel and the water inlet flow channel are sequentially arranged from top to bottom;
the inner wall surfaces of the volute flow channel and the water inlet flow channel are respectively provided with a metal lining;
the motor is arranged on the top surface of the pump foundation, the gear box is connected with the lower end of an output shaft of the motor, and the gear box is connected with the upper end of the pump shaft through a coupling;
the pump cover is sleeved on the pump shaft and fixed at the bottom end of the pump foundation;
the guide bearing, the water retaining ring and the shaft sleeve are sequentially sleeved on the lower part of the pump shaft from top to bottom;
the impeller is positioned in the volute flow channel and is connected to the bottom end of the pump shaft through a shaft end flange, and the bottom end of the shaft sleeve is connected with the impeller through a screw;
the main shaft sealing assembly and the air bag sealing assembly are sleeved on the shaft sleeve up and down;
a protective sleeve is sleeved outside the shaft sleeve and is positioned between the main shaft sealing assembly and the air bag sealing assembly;
the protective cover covers the outer part between the joint of the gear box and the coupler and the bottom end of the guide bearing.
The circulating water pump for the secondary circulating cooling water system of the nuclear power station is characterized in that the metal linings of the water inlet flow channel and the volute flow channel are respectively formed by welding duplex stainless steel;
the impeller is integrally cast by 1.4468 duplex stainless steel;
the pump cover is formed by welding 1.4462 duplex stainless steel plates;
the shaft sleeve and the protective sleeve are welded by 1.4462 duplex stainless steel;
the coupler is a rigid coupler, and the coupler is made of 35 CrMo.
The circulating water pump for the secondary circulating cooling water system of the nuclear power station is characterized in that the motor is detachably arranged on the top surface of the pump base, and the gear box is detachably arranged in the pump base.
The circulating water pump for the secondary circulating cooling water system of the nuclear power station is characterized in that the impeller is provided with the balance hole and the flow guide cap, and the upper end and the lower end of the impeller are respectively provided with the upper sealing ring and the lower sealing ring.
The circulating water pump for the secondary circulating cooling water system of the nuclear power station is characterized in that the guide bearing is a water-cooling oil-immersed self-lubricating bearing, and a bearing bush of the guide bearing is a babbitt metal bearing bush.
The circulating water pump for the secondary circulating cooling water system of the nuclear power station is characterized in that the gear box is a planetary reduction gear box, and the bottom of the gear box is provided with a radial and thrust combined bearing; and a matched lubricating oil system is also arranged in the gear box.
The circulating water pump for the secondary circulating cooling water system of the nuclear power station is characterized in that the protective cover is of a half-divided structure, and a movable window is arranged at the position, close to the guide bearing, of the protective cover.
The utility model discloses a circulating water pump for nuclear power station secondary circulating cooling water system changes the concrete water inlet runner and the spiral case runner that the nuclear power plant usually adopts into the water inlet runner and the spiral case runner that are provided with the metal lining, has satisfied the demand of secondary circulating cooling water system low discharge high lift; the water inlet flow channel and the volute flow channel which are provided with the metal linings are adopted, so that the flushing resistance of the flow channels is enhanced, and the service life of the circulating water pump is prolonged.
Drawings
FIG. 1 is a schematic diagram of the operation of a secondary circulating cooling water system of a nuclear power plant;
FIG. 2 is a schematic structural diagram of a circulating water pump for a secondary circulating cooling water system of a nuclear power station according to the present invention;
FIG. 3 is an enlarged partial schematic view of the pump body.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the following detailed description is provided with reference to the accompanying drawings:
referring to fig. 2 and 3, in accordance with a preferred embodiment of the present invention, a circulating water pump for a secondary circulating cooling water system of a nuclear power plant includes a water inlet channel 1, a volute channel 2, a pump foundation 16, and a pump body, wherein the pump body includes a motor 10, a gear box 11, a pump shaft 13, a pump cover 17, a guide bearing 9, a water retaining ring 8, a shaft sleeve 6, an impeller 3, a main shaft seal assembly 7, an air bag seal assembly 4, and a protection cover 14.
The water inlet flow passage 1, the volute flow passage 2 and the pump foundation 16 are integrally cast by seawater-resistant reinforced concrete, and the pump foundation 16, the volute flow passage 2 and the water inlet flow passage 1 are sequentially arranged from top to bottom; the inner wall surfaces of the volute flow passage 2 and the water inlet flow passage 1 are respectively provided with a metal lining 15; the metal linings 15 of the water inlet flow passage and the volute flow passage are respectively formed by welding duplex stainless steel.
The motor 10 is detachably arranged on the top surface of the pump base 16, the gear box 11 is detachably arranged in the pump base 16, the gear box 11 is connected with the lower end of an output shaft of the motor 10, and the gear box 11 is connected with the upper end of the pump shaft 13 through a coupling 12; the pump cover 17 is sleeved on the pump shaft 13 and fixed at the bottom end of the pump foundation 16; the guide bearing 9, the water retaining ring 8 and the shaft sleeve 6 are sequentially sleeved on the lower part of the pump shaft 13 from top to bottom; the impeller 3 is positioned in the volute flow channel 2 and is connected to the bottom end of the pump shaft 12 through a shaft end flange, and the bottom end of the shaft sleeve 6 is connected with the impeller 3 through a screw; the main shaft sealing component 7 and the air bag sealing component 4 are sleeved on the shaft sleeve 6 up and down; a protective sleeve 5 is sleeved outside the shaft sleeve 6, and the protective sleeve 5 is positioned between the main shaft sealing assembly 7 and the air bag sealing assembly 4; a shield 14 covers the outside between the connection of the gear box 11 and the coupling 12 to the bottom end of the guide bearing 9. The protective cover adopts a half-divided structure, so that the installation and the disassembly are convenient; the protective cover 14 is provided with a movable window near the guide bearing, so that lubricating oil can be conveniently added to the guide bearing.
The impeller 3 is integrally cast by 1.4468 duplex stainless steel, and the upper end and the lower end of the impeller 3 are respectively provided with an upper sealing ring and a lower sealing ring which can be replaced, so that the service life of the impeller is prolonged. The impeller 3 is provided with a balance hole and a flow guide cap. The pump shaft 13 is made of a 45 or 20Cr13 forged piece, the shaft end flange and the pump shaft 13 are integrally forged and connected with the impeller 3 through the shaft end flange, and the pump shaft is more convenient to process, assemble and disassemble compared with a long key connection mode. The pump cover 17 is formed by welding 1.4462 duplex stainless steel plates, the pump cover 17 is connected to an embedded part at the bottom of the pump foundation 16 through a flange, the pump cover 17 is used for supporting a guide bearing support and a guide bearing 9, and the guide bearing 9 is installed above the pump cover 17 through the guide bearing support. The guide bearing 9 is a water-cooling oil-immersion self-lubricating bearing, and the bearing bush of the guide bearing 9 is a babbitt metal bearing bush. The water retaining ring 8 is positioned below the guide bearing 9, and prevents seawater leaked from the main shaft sealing assembly from splashing to the guide bearing 9. The main shaft sealing component 7 adopts a packing sealing mode, and the packing box, the packing gland and the water seal ring all adopt a halved structural mode, so that the assembly and disassembly are convenient. The shaft sleeve 6 and the protective sleeve 5 are formed by welding 1.4462 dual-phase steel and are installed in a matching mode with the pump shaft 13 to isolate seawater from the pump shaft 13 at the section, and the connecting part is sealed by an O-shaped ring to prevent seawater from permeating into the pump shaft and corroding the pump shaft. The coupling 12 is a rigid coupling made of 35 CrMo.
The gear box 11 and the motor 10 are rigidly connected. The gearbox 11 is a planetary reduction gearbox, the core package of the gearbox 11 is composed of a planet carrier, a sun gear, planet wheels (3 planet or 4 planet) and the like, the bottom of the gearbox 11 is provided with a radial and thrust combined bearing, and the axial force generated by the pump set is borne by the bearing. A matched lubricating oil system is also arranged in the gear box 11.
The motor 10 and the gear box 11 are connected in a tooth form. The motor 10 adopts a large vertical squirrel cage asynchronous motor. The motor 10 may be operated in a variable frequency or fixed frequency mode.
The utility model discloses a circulating water pump for nuclear power station secondary circulating cooling water system, intake runner and spiral case runner are provided with the metal back lining that duplex stainless steel welded and formed, and the spare part that contacts with the sea water also all is duplex steel, has increased the life of pump package; the concrete water inlet flow channel and the volute flow channel which are usually adopted by the nuclear power plant are changed into the water inlet flow channel and the volute flow channel which are provided with metal linings, so that the requirement of a secondary circulating cooling water system for low flow and high lift is met.
To sum up, the utility model discloses a circulating water pump for nuclear power station secondary recirculating cooling water system adopts the water inlet runner and the spiral case runner that are provided with the metal lining, has strengthened the resistant scouring performance of runner, has satisfied the demand of secondary recirculating cooling water system low discharge high lift, has improved circulating water pump's life.
It will be appreciated by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as limitations of the present invention, and that changes and modifications to the above described embodiments will fall within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.
Claims (7)
1. The utility model provides a circulating water pump for nuclear power station secondary circulating cooling water system, its characterized in that, includes into water flow channel, spiral case runner, pump basis and the pump body, the pump body includes motor, gear box, pump shaft, pump cover, guide bearing, manger plate circle, axle sleeve, impeller, main shaft seal assembly, gasbag seal assembly and protection casing, wherein:
the water inlet flow channel, the volute flow channel and the pump foundation are integrally cast by seawater-resistant reinforced concrete, and the pump foundation, the volute flow channel and the water inlet flow channel are sequentially arranged from top to bottom;
the inner wall surfaces of the volute flow channel and the water inlet flow channel are respectively provided with a metal lining;
the motor is arranged on the top surface of the pump foundation, the gear box is connected with the lower end of an output shaft of the motor, and the gear box is connected with the upper end of the pump shaft through a coupling;
the pump cover is sleeved on the pump shaft and fixed at the bottom end of the pump foundation;
the guide bearing, the water retaining ring and the shaft sleeve are sequentially sleeved on the lower part of the pump shaft from top to bottom;
the impeller is positioned in the volute flow channel and is connected to the bottom end of the pump shaft through a shaft end flange, and the bottom end of the shaft sleeve is connected with the impeller through a screw;
the main shaft sealing assembly and the air bag sealing assembly are sleeved on the shaft sleeve up and down;
a protective sleeve is sleeved outside the shaft sleeve and is positioned between the main shaft sealing assembly and the air bag sealing assembly;
the protective cover covers the outer part between the joint of the gear box and the coupler and the bottom end of the guide bearing.
2. The circulating water pump for the secondary circulating cooling water system of the nuclear power plant as claimed in claim 1, wherein the metal linings of the water inlet flow passage and the volute flow passage are respectively welded by duplex stainless steel;
the impeller is integrally cast by 1.4468 duplex stainless steel;
the pump cover is formed by welding 1.4462 duplex stainless steel plates;
the shaft sleeve and the protective sleeve are welded by 1.4462 duplex stainless steel;
the coupler is a rigid coupler, and the coupler is made of 35 CrMo.
3. The circulating water pump for a secondary circulating cooling water system of a nuclear power plant as claimed in claim 1, wherein the motor is detachably provided on a top surface of the pump base, and the gear box is detachably provided in the pump base.
4. The circulating water pump for the secondary circulating cooling water system of the nuclear power plant as claimed in claim 1, wherein the impeller is provided with a balance hole and a deflector cap, and an upper sealing ring and a lower sealing ring are respectively installed at the upper end and the lower end of the impeller.
5. The circulating water pump for the secondary circulating cooling water system of the nuclear power plant as claimed in claim 1, wherein the guide bearing is a water-cooling oil-immersed self-lubricating bearing, and a babbitt metal bearing shell is adopted as a bearing shell of the guide bearing.
6. The circulating water pump for the secondary circulating cooling water system of the nuclear power plant as claimed in claim 1, wherein the gearbox is a planetary reduction gearbox, and a radial and thrust combined bearing is arranged at the bottom of the gearbox; and a matched lubricating oil system is also arranged in the gear box.
7. The circulating water pump for the secondary circulating cooling water system of the nuclear power plant as claimed in claim 1, wherein the protective cover is of a half-split structure, and a movable window is arranged at a position close to the guide bearing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123117874.XU CN217233812U (en) | 2021-12-08 | 2021-12-08 | Circulating water pump for secondary circulating cooling water system of nuclear power station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123117874.XU CN217233812U (en) | 2021-12-08 | 2021-12-08 | Circulating water pump for secondary circulating cooling water system of nuclear power station |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217233812U true CN217233812U (en) | 2022-08-19 |
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ID=82826146
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123117874.XU Active CN217233812U (en) | 2021-12-08 | 2021-12-08 | Circulating water pump for secondary circulating cooling water system of nuclear power station |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217233812U (en) |
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2021
- 2021-12-08 CN CN202123117874.XU patent/CN217233812U/en active Active
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