CN210265246U - Bearing body assembly for RCV charging pump - Google Patents
Bearing body assembly for RCV charging pump Download PDFInfo
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- CN210265246U CN210265246U CN201920466305.XU CN201920466305U CN210265246U CN 210265246 U CN210265246 U CN 210265246U CN 201920466305 U CN201920466305 U CN 201920466305U CN 210265246 U CN210265246 U CN 210265246U
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Abstract
The utility model discloses a bearing body subassembly that is used for RCV charge pump of nuclear power field, including the bearing body that fixes with the pump cover of RCV charge pump, fix at the ball bearing of the internal circumference of bearing, cup joint the fixed bearing housing at the ball bearing radial inside and the pump shaft of RCV charge pump; a vertical lubricating oil inlet channel is arranged inside the bearing sleeve; a lubricating oil return pipeline is arranged on the outer circumference of the bearing body; a lubricating oil storage space is arranged in the bearing body; the lubricating oil inlet channel and the lubricating oil return pipeline are communicated with the lubricating oil storage space and the ball bearing. The technical effects are as follows: the problem that the temperature of the ball bearing is too high in a dry grinding state under the condition of no pre-lubrication is avoided by designing the whole bearing body into a structure with an oil storage function.
Description
Technical Field
The utility model relates to a nuclear power equips a bearing body subassembly that is used for RCV to go up charge pump in field.
Background
Nuclear power is increasingly concerned by many countries as a powerful, controllable and relatively safe clean energy, and environmental problems caused by greenhouse gas emission bring huge pressure, so that the world nuclear power is steadily and rapidly developed by means of good operation performance of the world nuclear power plant and the gradual improvement and promotion of nuclear power technology.
The total power generation amount of the nuclear power station in China is less, the power generation amount is smaller compared with the power generation amount in China, and the power generation amount is far worse than the average level of nuclear power in other countries in the world. In order to guarantee the safety of energy supply, meet the continuously increasing demand of electric power in China, reduce environmental pollution, adjust energy structures and ensure the continuous and stable development of the national economic society, the nuclear power policy in China is timely adjusted and gradually changed from 'moderate development nuclear power' into 'active development nuclear power'. Due to the support of national policies, the nuclear power construction in China is promoted to enter a rapid development period.
The RCV charging pump is applied to a Hualongyi reactor type nuclear power station, and is used for charging reactor coolant which is subjected to treatment such as purification, hydrogenation, dosing, degassing, boron regulation and the like into an RCP system, so that first shaft seal injection water is provided for three reactor coolant pumps, and propulsion flow is provided for an injector of a hydrogenation station. RCVs are known as chemical and volume control systems. The RCP system is referred to as a reactor coolant system.
Problems currently faced by RCV charge-up pumps include:
the RCV has more charging pump stages, a performance curve of steep drop needs to be obtained, the rotor dynamics needs to be comprehensively considered, the rigidity of a pump group is considered, and the good vibration of the pump group is ensured.
The pump unit should be able to be started directly without pre-lubrication.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming prior art's not enough, provide a bearing body subassembly that is used for RCV to go up the charge pump, it can avoid ball bearing dry grinding state produced high temperature's problem under the condition of not lubricating in advance.
One technical scheme for achieving the above purpose is as follows: a bearing body assembly for an RCV charging pump comprises a bearing body fixed with a pump cover of the RCV charging pump, a ball bearing fixed on the inner circumference of the bearing body, and a bearing sleeve fixedly sleeved with the pump shaft of the RCV charging pump on the radial inner side of the ball bearing;
a vertical lubricating oil inlet channel is arranged inside the bearing sleeve; a lubricating oil return pipeline is arranged on the outer circumference of the bearing body; a lubricating oil storage space is arranged in the bearing body; the lubricating oil inlet channel and the lubricating oil return pipeline are communicated with the lubricating oil storage space and the ball bearing.
Furthermore, a heat dissipation rib plate is arranged around the outer circumference of the bearing body.
Further, a heat dissipation rib plate is arranged around the outer circumference of the lubricating oil storage space.
Furthermore, the lower end of the outer circumference of the bearing sleeve is provided with a sharp hook oil throwing structure pointing to a pump shaft of the RCV charging pump.
Furthermore, an oil slinger is arranged on the outer circumference of the bearing sleeve.
Further, the upper part of the bearing body is sealed by a bearing body sealing cover.
Further, a fan cover is sleeved on the radial outer side of the bearing body sealing cover, and an air discharging component extending out of the fan cover is arranged on the outer circumference of the bearing body sealing cover.
Further, the air bleeding part has a labyrinth structure.
Furthermore, a fan corresponding to the position of the fan cover is sleeved on a pump shaft of the RCV pump.
Furthermore, the bearing body is fixed with a pump cover of the RCV charging pump through a bearing body support.
The technical scheme of the bearing body assembly for the RCV charging pump of the utility model is adopted, which comprises a bearing body fixed with the pump cover of the RCV charging pump, a ball bearing fixed on the inner circumference of the bearing body, and a bearing sleeve fixedly sleeved on the radial inner side of the ball bearing and the pump shaft of the RCV charging pump; a vertical lubricating oil inlet channel is arranged inside the bearing sleeve; a lubricating oil return pipeline is arranged on the outer circumference of the bearing body; a lubricating oil storage space is arranged in the bearing body; the lubricating oil inlet channel and the lubricating oil return pipeline are communicated with the lubricating oil storage space and the ball bearing. The technical effects are as follows: the whole bearing body is designed into a structure with an oil storage function, so that the problem that the temperature of the ball bearing is too high in a dry grinding state without pre-lubrication is avoided.
Drawings
Fig. 1 is a schematic diagram of the structure of an RCV charging pump.
Fig. 2 is an enlarged schematic view of a portion a of fig. 1.
Fig. 3 is an enlarged schematic view of a portion B in fig. 2.
Fig. 4 is an enlarged schematic view of a portion C in fig. 1.
Detailed Description
Referring to fig. 1, in order to better understand the technical solution of the present invention, the inventor of the present invention will now describe in detail the following embodiments with reference to the accompanying drawings:
referring to fig. 1, the RCV charging pump is a multi-stage, vertical, bottom suction, bottom discharge centrifugal pump, and the overall structure is a double-cylinder, core-pulling, impeller-symmetric arrangement, water-lubricated bearing structure.
The RCV charging pump comprises a cylinder body 100, and a medium inlet and a medium outlet are both positioned at the bottom of the cylinder body 100, wherein the medium inlet is positioned at the center of the cylinder body 100, and the medium outlet is offset from the center of the cylinder body 100. The bottom of the medium inlet is provided with an inlet flange 101 and the bottom of the medium outlet is provided with an outlet flange 102.
The radially inner side of the cylinder 100 forms a seating chamber communicating with the medium inlet, vertically penetrating the cylinder 100.
The first-stage middle section 201, the eight lower-stage middle sections 202, the last-stage lower-stage middle section 203, the middle section 204, the last-stage upper-stage middle section 205, the eight upper-stage middle sections 206 and the suction cover 207 are sequentially arranged in the accommodating cavity from bottom to top. The top of the cartridge 100 is closed by a pump cap 103. The pump cover 103 is fixed to the top surface of the cylinder 100 by a main bolt, a main nut, and a washer.
The first-stage middle section 201, the eight lower-stage middle sections 202, the last-stage lower-stage middle section 203, the middle section 204, the last-stage upper-stage middle section 205, the eight upper-stage middle sections 206 and the suction cover 207 form a core package, and a core-pulling structure is arranged between the core package and the cylinder 100. An annular gap is left between the core pack and the barrel 100.
The middle section 204 fits the inner circumference of the cylinder 100, and an O-ring is provided between the middle section 204 and the inner circumference of the cylinder 100, so that the annular gap between the core pack and the cylinder 100 is divided into a medium ascending channel 100b located above the middle section 204, and a medium outlet channel 100a located below the middle section 204, which communicates with the medium outlet.
The upper end faces of the first stage middle section 201, the eight lower middle sections 202, and the last stage lower middle section 203 each fix one lower guide vane 21 by a pin. The first-stage middle section 201 and the corresponding lower guide vane 21 enclose a first-stage impeller space, and eight lower-stage middle sections 202 and a last-stage lower-stage middle section 203, and the corresponding lower guide vane 21 enclose eight lower impeller spaces which are sequentially arranged from bottom to top.
The lower end face of the last-stage upper middle section 205, the lower end faces of the eight upper middle sections 206, and the lower end face of the suction cover 207 are respectively fixed with one upper guide vane 22 through pins, and the last-stage upper middle section 205, the eight upper middle sections 206, and the suction cover 207 and the corresponding upper guide vanes 22 respectively enclose ten upper impeller spaces which are sequentially arranged from bottom to top.
In order to absorb shock effectively and absorb thermal expansion, the first-stage middle section 201, the eight lower middle sections 202, the last-stage lower middle section 203, and the middle section 204 are integrally connected to the lower portion by a plurality of lower cross bars 23.
The final upper middle section 205, eight upper middle sections 206, and the suction cover 207 are integrally connected to the upper part by a plurality of upper bars 24.
The lower unit and the upper unit are connected by a connecting bolt and pressed by a disc spring 25.
The elastic filtering part of the disc spring 25 is used for vibrating, and when the core bag is thermally expanded, the disc spring 25 is compressed to give an increased amount of extension, so that the stability and efficiency of the pump are improved.
The pump shaft 3 vertically penetrates through the core bag and is sleeved with twenty impellers, namely a first-stage impeller 31, nine lower impellers 32 and ten upper impellers 33 which are sequentially arranged from bottom to top. The first-stage impeller 31 corresponds to a first-stage impeller space and nine lower impellers 32, and sequentially corresponds to nine lower impeller spaces which are sequentially arranged from bottom to top, and the ten upper impellers 33 sequentially correspond to ten upper impeller spaces which are sequentially arranged from bottom to top.
The radial inner sides of the eight lower middle sections 202 and the radial inner sides of the last lower middle sections 203 are respectively fixed with a lower impeller sealing ring 212 through screws, and the radial inner sides of the lower guide vanes 21 corresponding to the first middle sections 201 and the radial inner sides of the eight lower guide vanes 21 corresponding to the eight lower middle sections 202 are respectively fixed with a lower guide vane sleeve 211 through screws. The lower guide vanes 21, which correspond to the last stage lower middle section 203, are stepped to snap into engagement with the middle section 204. The lower impeller sealing ring 212 and the lower guide vane sleeve 211 are made of bearing materials and form bearing lubrication matching with the corresponding impeller.
An upper impeller seal ring 222 is fixed to the radially inner side of the last-stage upper middle section 205, the radially inner sides of the eight upper middle sections 206, and the radially inner side of the suction cover 207 by screws, and an upper vane sleeve 221 is fixed to the radially inner sides of the upper guide vanes 22 corresponding to the eight upper middle sections 206, and the radially inner sides of the upper guide vanes 22 corresponding to the suction cover 207 by screws. The upper guide vanes 22 corresponding to the last stage upper middle section 205 are stepped to snap into engagement with the middle section 204. The upper impeller sealing ring 222 and the upper guide vane sleeve 221 are made of bearing materials, and form bearing lubrication matching with the corresponding impeller.
The water inlets of the first-stage impeller 31 and the nine lower impellers 32 are vertically downward, and snap rings 35 are arranged between the first-stage impeller 31 and the lower impeller 32 at the bottom end and between the adjacent lower impellers 32.
The water inlets of the ten upper impellers 33 are vertically upward, and clamping rings 35 are arranged between every two adjacent upper impellers 33.
The pump shaft 3 is also sleeved with an intermediate shaft sleeve 34 corresponding to the intermediate section 204. Snap rings 35 are also provided between the intermediate sleeve 34 and the topmost lower impeller 32, i.e., the lower impeller 32 corresponding to the last stage lower mid-section 203, and the bottommost upper impeller 33, i.e., the upper impeller 33 corresponding to the last stage upper mid-section 205.
The pump shaft 3, the first-stage impeller 31, the nine lower impellers 32, and the ten upper impellers 33 constitute a rotor part.
The lower ten-stage impeller and the ten-stage upper impeller 33 which are composed of the first-stage impeller 31 and the nine lower impellers 32 are symmetrically arranged, the axial force of the pump shaft 3 is vertically downward, and the pump shaft 3 is in a tension state during operation, so that the pump set can stably operate. The lower ten-stage impeller and the ten-stage upper impeller 33 which are composed of the first-stage impeller 31 and the nine lower impellers 32 are in stepped fit with the pump shaft 3, so that the difficulty in installation is effectively reduced, and the installation time is shortened.
A lower guide bearing 41 is fixed to the radially inner side of the first-stage middle section 201. The lower guide bearing 41 is matched with the first-stage middle section 201 through a step surface. The sealing ring surface 311 of the first-stage impeller 31 is elongated in the axial direction of the pump shaft 3, so that an annular gap is formed between the sealing ring surface 311 of the first-stage impeller 31 and the inner circumference of the lower guide bearing 41, which is a lubricating surface of the lower guide bearing 41.
A water inlet horn 42 is coaxially fixed to the bottom surface of the lower guide bearing 41. The lower guide bearing 41, the water inlet horn 42 and the first-stage middle section 201 are fixed through studs in the vertical direction, and a guide plate 421 corresponding to the water inlet of the first-stage impeller 31 is arranged on the inner circumference of the front end of the water inlet horn 42, so that the stability of the rotation center of the pump shaft 3 is guaranteed. An O-shaped ring is arranged between the lower guide bearing 41 and the first-stage middle section 201.
A gap is reserved between the first-stage middle section 201 and the lower guide bearing 41, and a lubricating channel 201a for a medium to flow from the water outlet of the first-stage impeller 31 to the gap between the first-stage middle section 201 and the lower guide bearing 41 is reserved on the first-stage middle section 201.
The lower guide bearing 41 is also provided with a radial lubrication channel 411 which is communicated with the lubrication surface and the gap between the first-stage middle section 201 and the lower guide bearing 41.
The water inlet horn 42, the lower guide bearing 41, the first-stage middle section 201, the corresponding lower guide vane 21 and the corresponding first-stage impeller 31 form a lower guide bearing lubricating structure of the RCV upper charge pump.
The lower guide bearing 41 corresponding to the first-stage impeller 31 uses the water outlet of the first-stage impeller 31 for water diversion, and the first-stage impeller 31 is matched with the longer lower guide bearing 41 to form a water lubrication bearing which is lengthened in the vertical direction, so that the running stability of the pump is improved.
Radially inward of the intermediate section 204 is an intermediate guide bearing 43. The intermediate guide bearing 43 is in step fit with the top surface of the middle section 204 and fixed through a stud. An annular gap is formed between the inner circumference of the intermediate guide bearing 43 and the outer circumference of the intermediate sleeve 34, which is a lubricating surface of the intermediate guide bearing 43. An annular gap is reserved between the middle guide bearing 43 and the middle section 204, and an O-shaped ring is arranged between the middle guide bearing 43 and the middle section 204 in the radial direction.
The upper guide bearing 44 is fixed on the inner circumference of the pump cover 103 and supported by the top surface of the suction cover 207, and the upper shaft sleeve 36 corresponding to the upper guide bearing 44 is fixed on the pump shaft 3 in a sleeved manner, and an annular gap is left between the upper shaft sleeve 36 and the inner circumference of the upper guide bearing 44 to form a lubricating surface of the upper guide bearing 44.
A mechanical seal 5 is arranged between the pump cover 103 and the pump shaft 3, and the mechanical seal 5 and the top surface of the pump cover 103 are fixed through a stud and a nut. The mechanical seal is a double-ended mechanical seal equipped with a sealed heat exchanger.
The middle section 204 is provided with a medium overflowing channel 204a which is communicated with the water outlet of the topmost lower impeller 32 and the medium ascending channel 100b, and a medium return channel 204b which is communicated with the water outlet of the bottommost upper impeller 33 and the medium outlet channel 100 a;
the suction cover 207 is provided with a communication passage 207a for communicating the medium ascent passage 100b with the inlet of the uppermost upper impeller 33.
And a balance pipeline 100c for communicating the upper end surface of the upper guide bearing 44 with the water outlet of the primary impeller 31 is reserved on the pump cover 103 and the cylinder 100.
The medium is conveyed by the first-stage impeller 31 and the ninth-stage lower impeller 32, passes through the medium flow-through channel 204a, the medium ascending channel 100b and the connecting channel 207a, reaches the water inlet of the topmost upper impeller 33, is conveyed by the ten-stage upper impeller 33, passes through the medium return channel 204b and the medium outlet channel 100a, and is discharged from the medium outlet.
The radial outer side of the pump cover 103 is provided with a first blocking flange 104 and a second blocking flange 105 corresponding to the balance pipeline 100c, the first blocking flange 104 is fixed with the pump cover 103 through a stud and a nut, and an O-shaped ring is arranged between the first blocking flange 104 and the pump cover 103. The second blocking flange 105 and the pump cover 103 are fixed through a plug, a stud and a nut. An O-ring is arranged between the second blocking flange 105 and the pump cover 103.
And a bearing body support 61 is arranged on the radial outer side of the mechanical seal 5, and the bearing body support 61 and the top surface of the pump cover 103 are positioned through a pin.
A bearing body 62 is fixed above the bearing body bracket 61. The inner circumference of the bearing body 62 is provided with a ball bearing 63, the radial inner side of the ball bearing 63 is provided with a bearing sleeve 64 fixedly connected with the pump shaft 3 in a sleeved mode, a vertical lubricating oil inlet channel 641 is arranged inside the bearing sleeve 64, a lubricating oil return pipeline 621 is arranged on the outer circumference of the bearing body 62, a lubricating oil storage space 622 is arranged inside the bearing body 62, and the lubricating oil inlet channel 641 and the lubricating oil return pipeline 621 are both communicated with the lubricating oil storage space 622 and the ball bearing 63, so that a lubricating oil circulation pipeline is formed. Due to the design, the whole bearing body 62 is designed into a structure with an oil storage function, so that the problem of overhigh temperature generated when the ball bearing 63 is in a dry grinding state without pre-lubrication is avoided.
The outer circumference of the bearing body 62 and the outer circumference of the lubricant storage space 622 are provided with heat dissipation ribs 623, which increase the rigidity of the bearing body 62 and increase the heat dissipation area, thereby facilitating the heat dissipation of the bearing body 62.
The upper part of the bearing body 62 is sealed by a bearing body sealing cover 65, a fan cover 66 is sleeved on the radial outer side of the bearing body sealing cover 65, the fan cover 66 and the bearing body sealing cover 65 are fixed by a stud, and an air discharging component 651 extending out of the fan cover 66 is arranged on the outer circumference of the bearing body sealing cover 65. The upper part of the pump shaft 3 is provided with a fan 67 corresponding to the position of the fan cover 66. The fan 67 can take away heat without additional cooling water.
The lower end of the outer circumference of the bearing sleeve 64 is provided with a sharp hook oil throwing structure 643 pointing to the pump shaft 3, so that the lubricating oil in the bearing body 62 can be thrown into the lubricating oil inlet channel 641 of the bearing sleeve 64 through the rotation of the pump shaft 3 and then flows to the upper part of the ball bearing 63 to lubricate the ball bearing 63 from bottom to top.
The air bleeding member 651 of the bearing body cover 65 has a labyrinth structure, and can reliably prevent contaminants such as moisture and dust from entering the bearing body 62 and also reduce volatilization of the lubricating oil.
Bearing body 62, ball bearing 63, bearing housing 64, bearing body closing cap 65 and fan 67 constitute the utility model discloses a bearing body subassembly that is used for RCV to go up the pump that fills.
In an accident condition, the RCV charging pump can be started quickly without pre-lubrication, and can run normally without adding lubricant again within two years of the upper guide bearing 44, the lower guide bearing 41, the middle guide bearing 43 and the ball bearing 63.
The top end of the pump shaft 3 is driven by an alternating current induction motor, a coupling 39 with a middle short shaft is used between the pump shaft 3 and the alternating current induction motor, and the mechanical seal 5 can be maintained and replaced when the alternating current induction motor is not detached.
The upper guide bearing 44, the middle guide bearing 43 and the lower guide bearing 41 are all water-lubricated bearings, preferably WR525 type bearings, can bear 135 ℃ high temperature, and adopt conveying medium self-lubrication.
The axial force of the pump shaft 3 has the automatic balancing function, so that the axial thrust of the pump is basically balanced in the full flow range of the operation of the charge pump on the RCV, and the axial load of the ball bearing 63 in the bearing body 62 is small enough to meet the service 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 (9)
1. A bearing body assembly for an RCV charging pump comprises a bearing body fixed with a pump cover of the RCV charging pump, a ball bearing fixed on the inner circumference of the bearing body, and a bearing sleeve fixedly sleeved with the pump shaft of the RCV charging pump on the radial inner side of the ball bearing; the method is characterized in that:
a vertical lubricating oil inlet channel is arranged inside the bearing sleeve; a lubricating oil return pipeline is arranged on the outer circumference of the bearing body; a lubricating oil storage space is arranged in the bearing body; the lubricating oil inlet channel and the lubricating oil return pipeline are communicated with the lubricating oil storage space and the ball bearing.
2. The bearing body assembly for an RCV charging pump of claim 1, wherein: and a heat dissipation rib plate is arranged around the outer circumference of the bearing body.
3. The bearing body assembly for an RCV charging pump of claim 1, wherein: and a heat dissipation rib plate is arranged around the outer circumference of the lubricating oil storage space.
4. The bearing body assembly for an RCV charging pump of claim 1, wherein: and the lower end of the outer circumference of the bearing sleeve is provided with a sharp hook oil throwing structure pointing to a pump shaft of the RCV charging pump.
5. The bearing body assembly for an RCV charging pump of claim 1, wherein: the upper part of the bearing body is sealed by a bearing body sealing cover.
6. The bearing body assembly for an RCV charging pump of claim 5, wherein: the radial outer side of the bearing body sealing cover is sleeved with a fan cover, and the outer circumference of the bearing body sealing cover is provided with an air discharging component extending out of the fan cover.
7. The bearing body assembly for an RCV charging pump of claim 6, wherein: the air bleeding part has a labyrinth structure.
8. The bearing body assembly for an RCV charging pump of claim 7, wherein: and a fan corresponding to the fan cover is sleeved on the pump shaft of the RCV pump.
9. The bearing body assembly for an RCV charging pump of claim 1, wherein: and the bearing body is fixed with a pump cover of the RCV charging pump through a bearing body bracket.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920466305.XU CN210265246U (en) | 2019-04-08 | 2019-04-08 | Bearing body assembly for RCV charging pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920466305.XU CN210265246U (en) | 2019-04-08 | 2019-04-08 | Bearing body assembly for RCV charging pump |
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| Publication Number | Publication Date |
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| CN210265246U true CN210265246U (en) | 2020-04-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920466305.XU Active CN210265246U (en) | 2019-04-08 | 2019-04-08 | Bearing body assembly for RCV charging pump |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114294256A (en) * | 2022-01-28 | 2022-04-08 | 浙江水泵总厂有限公司 | Bearing lubricating structure and barrel pump with same |
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2019
- 2019-04-08 CN CN201920466305.XU patent/CN210265246U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114294256A (en) * | 2022-01-28 | 2022-04-08 | 浙江水泵总厂有限公司 | Bearing lubricating structure and barrel pump with same |
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