CN215409227U - High-pressure safety injection pump of water-water high-energy reactor third-generation nuclear power unit - Google Patents
High-pressure safety injection pump of water-water high-energy reactor third-generation nuclear power unit Download PDFInfo
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- CN215409227U CN215409227U CN202121785418.XU CN202121785418U CN215409227U CN 215409227 U CN215409227 U CN 215409227U CN 202121785418 U CN202121785418 U CN 202121785418U CN 215409227 U CN215409227 U CN 215409227U
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Abstract
The utility model relates to a high-pressure safety injection pump of a water-water high-energy reactor third-generation nuclear power unit, which is a horizontal double-shell multistage centrifugal pump and comprises a pump barrel, a pump shaft, a plurality of first single-suction impellers and a plurality of second single-suction impellers, wherein a placement cavity is arranged in the pump barrel, a core pack assembly capable of being integrally loaded and drawn out is arranged in the placement cavity, and the first single-suction impellers and the second single-suction impellers are arranged on the pump shaft in series in two directions. The utility model has reasonable structure, resists the working conditions of medium high temperature, thermal shock and impurity, and can integrally extract the core package assembly comprising the pump cover, the rotor component, the stator component, the shaft seal component and the bearing component from the pump cylinder body for maintenance or replacement only by loosening the main nut during maintenance, thereby having short maintenance time; under all working conditions, the axial force can be self-balanced, a balancing mechanism is not required, and the reliability is good.
Description
Technical Field
The utility model relates to a high-pressure safety injection pump, in particular to a high-pressure safety injection pump of a water-water high-energy reactor third-generation nuclear power unit, which has the advantages of reasonable structure, medium and high temperature resistance, convenience in maintenance, no need of a balance mechanism and good reliability.
Background
A VVER (Water-Water energy Reactor) third-generation nuclear power unit is a pressurized Water Reactor nuclear power unit which is gradually expanded in application in the world at present.
The high-pressure safety injection pump is a main device of a safety injection system of a pressurized water reactor nuclear power station, belongs to the nuclear safety level 2, and is started to inject boric acid water into a reactor core when a primary loop system is broken or a main steam pipeline is broken to reduce the temperature of the primary loop and increase the positive reactivity, so that the reactor core is rapidly cooled and submerged, the accident is prevented from being further expanded, and the safety of the reactor is ensured. The medium delivered by the high-pressure safety injection pump is boron-containing water with radioactivity, and contains solid components such as concrete particles, paint skins, fibers and the like, the design working points of the pump are multiple, the performance curve is required to be steeply reduced, and the pump is required to be capable of resisting the high temperature and thermal shock of the medium at 150 ℃.
The existing high-pressure safety injection pump cannot realize core bag integral pumping, and has defects in maintenance convenience; the impellers are arranged in the same direction, axial forces generated by the impellers are superposed step by step, mechanisms such as a balance disc and a balance drum are required to be adopted for balancing, and the balance disc and the balance drum are easy to rub, wear and sensitive to gaps, and are easy to break down and fail in a medium containing solid particles.
SUMMERY OF THE UTILITY MODEL
In view of the above problems, the main object of the present invention is to provide a high pressure safety injection pump for a third generation nuclear power unit of a water-water high energy reactor, which has the advantages of reasonable structure, medium and high temperature resistance, convenient maintenance, no need of a balance mechanism, and good reliability.
The utility model solves the technical problems through the following technical scheme: a water-water high energy reactor third generation nuclear power unit high pressure safety injection pump, the water-water high energy reactor third generation nuclear power unit high pressure safety injection pump is a horizontal double-shell multistage centrifugal pump, the water-water high energy reactor third generation nuclear power unit high pressure safety injection pump includes: the pump comprises a pump barrel, a pump shaft, a plurality of first single-suction impellers and a plurality of second single-suction impellers, wherein a placement cavity is formed in the pump barrel, a core package assembly capable of being integrally installed and pulled out is arranged in the placement cavity, and the first single-suction impellers and the second single-suction impellers are installed on the pump shaft in series in two directions.
In an embodiment of the present invention, there are three first single suction impellers and three second single suction impellers.
In a specific implementation example of the utility model, the pump cylinder body is provided with an inlet pipe and an outlet pipe which are communicated with the placement cavity through welding; two wings of the pump cylinder body are provided with four supporting plates, and the lower planes of the supporting plates are as high as the central line of the pump set; one end of the lower part of the pump cylinder body is provided with a positioning round hole, and the other end is provided with a guiding rectangular groove.
In a specific embodiment of the present invention, the core pack assembly includes a pump cover, a rotor component, a stator component, a shaft seal component, and a bearing component;
the rotor component comprises a shaft, a first single suction impeller and a second single suction impeller;
the stator component comprises a suction section, a first middle section, a second middle section, a tail end middle section, a first radial guide vane, a second radial guide vane, a driving end bearing component, a non-driving end bearing component, a shaft seal component and a pump cover;
the rotor component rotates in the mounting cavity, the rotor component comprises a pump shaft, the pump shaft penetrates through the mounting cavity and is supported to rotate through a driving end bearing component and a non-driving end bearing component, the driving end bearing component comprises a radial rolling bearing, and the non-driving end bearing component comprises two radial thrust-adding rolling bearings;
the pump shaft is provided with three first single-suction impellers and three second single-suction impellers, and the first single-suction impellers and the second single-suction impellers are arranged on the pump shaft in series in two orientations;
the stator component is integrally arranged in the mounting cavity and is radially split and comprises a suction section, a first middle section, a second middle section, a tail end middle section, a first radial guide vane and a second radial guide vane;
the first middle section and the first radial guide vane are matched with the first single-suction impeller to work, the second middle section and the second radial guide vane are matched with the second single-suction impeller to work, and the first single-suction impeller, the radial guide vane, the middle section and the second single-suction impeller, the radial guide vane and the middle section are installed in opposite directions and self-balance axial force is achieved;
the suction section is arranged in front of the first middle section and is provided with a first cavity which is communicated with the first channel;
the middle section is arranged between the first middle section and the second middle section and is provided with a first flow passage and a second flow passage;
the middle section is matched with the pump cylinder body to form a second cavity connected with the first flow channel, and the middle section is matched with the pump cylinder body to form a third cavity connected with the second flow channel;
the tail end middle section is arranged between the second middle section and the pump cover and is provided with a third flow passage;
the pump cover is provided with a fourth cavity, a throttling sleeve is arranged on the pump cover, and a throttling gap formed by the throttling sleeve is used for blocking the fourth cavity and a third flow passage on the middle section of the tail end.
In a specific embodiment of the utility model, the shaft seal member is provided with a cooling jacket.
The positive progress effects of the utility model are as follows: the high-pressure safety injection pump of the water-water high-energy reactor third-generation nuclear power unit provided by the utility model has the following advantages: the utility model has reasonable structure, resists the working conditions of medium high temperature, thermal shock and impurity, and can integrally extract the core package assembly comprising the pump cover, the rotor component, the stator component, the shaft seal component and the bearing component from the pump cylinder body for maintenance or replacement only by loosening the main nut during maintenance, thereby having short maintenance time; under all working conditions, the axial force can be self-balanced, a balancing mechanism is not required, and the reliability is good.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a partial structural schematic diagram of the present invention.
Fig. 3 is another partial structural schematic diagram of the present invention.
Detailed Description
The following provides a detailed description of the preferred embodiments of the present invention with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of the present invention, fig. 2 is a schematic partial structural diagram of the present invention, and fig. 3 is another schematic partial structural diagram of the present invention, as shown in fig. 1 to 3: the utility model provides a high-pressure safety injection pump of a water-water high-energy reactor third-generation nuclear power unit, which is a horizontal double-shell multistage centrifugal pump and comprises a pump barrel, a pump shaft, a plurality of first single-suction impellers and a plurality of second single-suction impellers, wherein a mounting cavity is arranged in the pump barrel, a core package assembly capable of being integrally installed and pulled out is arranged in the mounting cavity, and the first single-suction impellers and the second single-suction impellers are installed on the pump shaft in series in two directions. In the given embodiment of the present invention, the number of the first single suction impeller and the number of the second single suction impeller are three.
An inlet pipe 110 and an outlet pipe 120 which are communicated with the mounting cavity are welded on the outer surface of the pump cylinder body 100, the inlet pipe and the pump cylinder body are provided with a first channel 111, and the outlet pipe and the pump cylinder body are provided with a second channel 121.
The pump cylinder 100 is provided with 4 support plates 150 by welding, the support plates are divided into two groups, the two groups are respectively distributed on two wings of the pump cylinder and are used for fixing the pump cylinder, the lower plane of each support plate 150 is as high as the central line of a pump group, and the height of the central line of the pump cylinder can be kept unchanged when the size of the pump cylinder is changed due to the change of medium temperature.
Under pump barrel 100, one end is equipped with the location round hole (label A in the figure) for set up the locating pin, and the other end is equipped with direction rectangular channel (label B in the figure), is used for setting up the guide key, and the effect is the thermal displacement of reasonable guide pump barrel under high temperature and thermal shock operating mode.
The core pack assembly which can be integrally installed and extracted is arranged in the arrangement cavity of the pump cylinder body and comprises a rotor component (comprising a shaft 200, a first single suction impeller 210 and a second single suction impeller 220), a stator component (comprising a suction section 300, a first middle section 310, a second middle section 320, a tail end middle section 330, a middle section 340, a first radial guide vane 350 and a second radial guide vane 360), a driving end bearing component 230, a non-driving end bearing component 240, a shaft seal component 250 and a pump cover 400. The core package subassembly can wholly settle the chamber after loosening main nut and take out and overhaul or change more.
And the rotor component can rotate in the mounting cavity and comprises a pump shaft 200, the pump shaft 200 traverses the mounting cavity and is supported to rotate through a driving end bearing component 230 and a non-driving end bearing component 240, the driving end bearing component 230 comprises a radial rolling bearing, and the non-driving end bearing component 240 comprises two radial + thrust rolling bearings.
The pump shaft 200 is provided with 3 first single suction impellers 210 and 3 second single suction impellers 220, and the first single suction impellers 210 and the second single suction impellers 220 are installed on the pump shaft 200 in series in two orientations.
The stator component is integrally arranged in the placement cavity and is radially split and comprises a suction section 300, a first middle section 310, a second middle section 320, a tail end middle section 330, a middle section 340, a first radial guide vane 350 and a second radial guide vane 360.
The first middle section 310 and the first radial guide vane 350 work with the first single suction impeller 210 in a matched mode, the second middle section 320 and the second radial guide vane 360 work with the second single suction impeller 210 in a matched mode, the installation directions of the first single suction impeller, the radial guide vanes, the middle section and the second single suction impeller, the radial guide vanes and the middle section are opposite, and self-balancing axial force can be achieved.
The suction section 300 is disposed in front of the first middle section, and is provided with a first cavity 301, and the first cavity 301 is communicated with the first channel 111.
The intermediate section 340 is disposed between the first and second intermediate sections 310, 320, the intermediate section 340 being provided with first and second flow passages 341, 342.
The middle segment 340 cooperates with the pump cylinder 100 to form the second cavity 102 connected to the first flow path 341, and the middle segment 340 cooperates with the pump cylinder 100 to form the third cavity 101 connected to the second flow path 342.
The end middle section 330 is installed between the second middle section 320 and the pump cover 400, and is provided with a third flow channel 331.
The pump cover 400 is provided with a fourth cavity 401, the pump cover 400 is provided with a throttling sleeve 410, and a throttling gap formed by the throttling sleeve 410 is used for blocking the fourth cavity 401 and the third flow channel 331 on the tail end middle section 300.
In a preferred embodiment of the present invention, the shaft seal parts 250 respectively disposed at the positions where the pump shaft 200 extends out of the suction section 300 and the pump cover 400 are cartridge mechanical seals, the shaft seal parts are provided with cooling jackets, the cooling jacket at the driving end and the suction section 300 form a fifth cavity 302, and the cooling jacket at the non-driving end and the pump cover 400 form a sixth cavity 402.
The following is a specific working process of the utility model:
during operation, a medium enters the first cavity 301 of the suction section 300 through the first passage 111 of the pump inlet pipe 110, flows into the inlet of the first single suction impeller 210, works through cooperation of the first single suction impeller 210, the first radial guide vane 350 and the first middle section 310, and enters the cavity 102 through the first flow passage 341 of the middle section 340 after energy is increased.
Then, the medium flows into the inlet of the second single suction impeller 220 through the third flow channel 331 of the terminal middle section 330, the direction is reversed, the medium performs work through the cooperation of the second single suction impeller 220, the second radial guide vane 360 and the second middle section 320, the medium after further energy lifting enters the cavity 101 through the second flow channel 342 of the middle section 340, and finally the medium flows out through the second passage 121 of the pump outlet pipe 120.
When the pump operates, the first single suction impeller 210 and the second single suction impeller 220 on both sides of the middle section 340 are respectively matched with the corresponding radial guide vanes and the middle section, and the generated axial forces are all directed to the inlet direction of the impellers, so that the axial forces generated by the first single suction impeller 210 and the second single suction impeller 220 can be balanced with each other.
In order to further improve the balance force, a balance pipe 140 is further arranged outside the pump cylinder body 100, the balance pipe is provided with a fourth flow passage 141, and the fourth flow passage 141 communicates the first cavity 301 with the fourth cavity 401, so that the residual axial force can be further balanced.
This eliminates the need for complex balancing devices (e.g., balancing disks, balancing drums) and structurally improves the reliability of this type of pump.
The fifth cavity 302 and the sixth cavity 402 are respectively filled with cooling water to prevent the medium from being conducted to the shaft seal at high temperature.
The utility model provides the working conditions of medium high temperature resistance, thermal shock resistance and impurity content, when in maintenance, the core package assembly comprising the pump cover, the rotor component, the stator component, the shaft seal component and the bearing component can be integrally extracted from the pump cylinder body for maintenance or replacement only by loosening the main nut, and the maintenance time is short; under all working conditions, the axial force can be self-balanced, a balancing mechanism is not required, and the reliability is good.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined by the appended claims and their equivalents.
Claims (5)
1. A water-water high energy reactor three-generation nuclear power unit high pressure safety injection pump is characterized in that: the high-pressure safety injection pump of the water-water high-energy reactor third-generation nuclear power unit is a horizontal double-shell multistage centrifugal pump, and comprises: the pump comprises a pump barrel, a pump shaft, a plurality of first single-suction impellers and a plurality of second single-suction impellers, wherein a placement cavity is formed in the pump barrel, a core package assembly capable of being integrally installed and pulled out is arranged in the placement cavity, and the first single-suction impellers and the second single-suction impellers are installed on the pump shaft in series in two directions.
2. The water-water high-energy reactor third-generation nuclear power unit high-pressure safety injection pump according to claim 1, characterized in that: the number of the first single suction impellers is three, and the number of the second single suction impellers is three.
3. The water-water high-energy reactor third-generation nuclear power unit high-pressure safety injection pump according to claim 1, characterized in that: the pump cylinder body is provided with an inlet pipe and an outlet pipe which are communicated with the mounting cavity through welding; two wings of the pump cylinder body are provided with four supporting plates, and the lower planes of the supporting plates are as high as the central line of the pump set; one end of the lower part of the pump cylinder body is provided with a positioning round hole, and the other end is provided with a guiding rectangular groove.
4. The water-water high-energy reactor third-generation nuclear power unit high-pressure safety injection pump according to claim 1, characterized in that: the core pack assembly comprises a pump cover, a rotor component, a stator component, a shaft seal component and a bearing component;
the rotor component comprises a shaft, a first single suction impeller and a second single suction impeller;
the stator component comprises a suction section, a first middle section, a second middle section, a tail end middle section, a first radial guide vane, a second radial guide vane, a driving end bearing component, a non-driving end bearing component, a shaft seal component and a pump cover;
the rotor component rotates in the mounting cavity, the rotor component comprises a pump shaft, the pump shaft penetrates through the mounting cavity and is supported to rotate through a driving end bearing component and a non-driving end bearing component, the driving end bearing component comprises a radial rolling bearing, and the non-driving end bearing component comprises two radial thrust-adding rolling bearings;
the pump shaft is provided with three first single-suction impellers and three second single-suction impellers, and the first single-suction impellers and the second single-suction impellers are arranged on the pump shaft in series in two orientations;
the stator component is integrally arranged in the mounting cavity and is radially split and comprises a suction section, a first middle section, a second middle section, a tail end middle section, a first radial guide vane and a second radial guide vane;
the first middle section and the first radial guide vane are matched with the first single-suction impeller to work, the second middle section and the second radial guide vane are matched with the second single-suction impeller to work, and the first single-suction impeller, the radial guide vane, the middle section and the second single-suction impeller, the radial guide vane and the middle section are installed in opposite directions and self-balance axial force is achieved;
the suction section is arranged in front of the first middle section and is provided with a first cavity which is communicated with the first channel;
the middle section is arranged between the first middle section and the second middle section and is provided with a first flow passage and a second flow passage;
the middle section is matched with the pump cylinder body to form a second cavity connected with the first flow channel, and the middle section is matched with the pump cylinder body to form a third cavity connected with the second flow channel;
the tail end middle section is arranged between the second middle section and the pump cover and is provided with a third flow passage;
the pump cover is provided with a fourth cavity, a throttling sleeve is arranged on the pump cover, and a throttling gap formed by the throttling sleeve is used for blocking the fourth cavity and a third flow passage on the middle section of the tail end.
5. The water-water high-energy reactor third-generation nuclear power unit high-pressure safety injection pump according to claim 4, characterized in that: the shaft seal component is provided with a cooling jacket.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121785418.XU CN215409227U (en) | 2021-08-02 | 2021-08-02 | High-pressure safety injection pump of water-water high-energy reactor third-generation nuclear power unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121785418.XU CN215409227U (en) | 2021-08-02 | 2021-08-02 | High-pressure safety injection pump of water-water high-energy reactor third-generation nuclear power unit |
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| CN215409227U true CN215409227U (en) | 2022-01-04 |
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| CN202121785418.XU Active CN215409227U (en) | 2021-08-02 | 2021-08-02 | High-pressure safety injection pump of water-water high-energy reactor third-generation nuclear power unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113417856A (en) * | 2021-08-02 | 2021-09-21 | 上海凯泉泵业（集团）有限公司 | High-pressure safety injection pump of water-water high-energy reactor third-generation nuclear power unit |
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2021
- 2021-08-02 CN CN202121785418.XU patent/CN215409227U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113417856A (en) * | 2021-08-02 | 2021-09-21 | 上海凯泉泵业（集团）有限公司 | High-pressure safety injection pump of water-water high-energy reactor third-generation nuclear power unit |
| CN113417856B (en) * | 2021-08-02 | 2024-05-17 | 上海凯泉泵业（集团）有限公司 | High-pressure safety injection pump of third-generation nuclear power unit of water-water high-energy reactor |
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