CN218761657U

CN218761657U - Butt welding type nuclear power automatic recirculation pump protection valve

Info

Publication number: CN218761657U
Application number: CN202221572487.7U
Authority: CN
Inventors: 张伟; 任李田; 包堂堂; 陈毅斌; 许爱玲; 周世军; 马佳; 丁志伟; 郑张利; 冯哲; 沈海平; 石新建
Original assignee: Beijing Aerospace Propulsion Institute; Shanghai Nuclear Engineering Research and Design Institute Co Ltd; Beijing Aerospace Petrochemical Technology and Equipment Engineering Corp Ltd
Current assignee: Beijing Aerospace Propulsion Institute; Shanghai Nuclear Engineering Research and Design Institute Co Ltd; Beijing Aerospace Petrochemical Technology and Equipment Engineering Corp Ltd
Priority date: 2022-06-22
Filing date: 2022-06-22
Publication date: 2023-03-28
Anticipated expiration: 2032-06-22

Abstract

The utility model relates to a nuclear power valve field specifically discloses a butt welding formula nuclear power automatic recirculation pump protection valve, including both ends and the total valve body that is used to lead the intercommunication, be provided with valve clack and guide cylinder in the total valve body, guide cylinder fixed connection is inside total valve body, the guide cylinder outside is located to the valve clack cover, and the valve clack is along the axis direction and the guide cylinder sliding connection of total valve body, be provided with the spring in the valve clack, the through-hole that runs through straight and spring place space intercommunication is seted up to the guide cylinder, the through-hole includes first cavity and the second cavity that distributes along keeping away from the valve clack direction in proper order, the diameter of second cavity is less than first cavity. The automatic recycling protection function of the centrifugal pump of the nuclear power station is realized, the valve can be detached on the premise of ensuring welding connection, the valve is convenient to overhaul and maintain, the sensitivity of the valve clack to fluid pulse is improved, and resonance is avoided.

Description

Butt welding type nuclear power automatic recirculation pump protection valve

Technical Field

The application relates to the technical field of nuclear power valves, in particular to a butt welding type nuclear power automatic recirculation pump protection valve.

Background

When the centrifugal pump operates under the condition of small water quantity, water is heated by the friction of the impeller in the pump body for a long time, so that the water temperature is increased. When the water temperature rises to a certain degree, vaporization can occur to form cavitation. The device aims to avoid the damage of valve internals and sealing surfaces caused by cavitation, and the vibration and noise of valves and connected pipelines, which bring the hidden danger of safe operation of systems and equipment. The nuclear power unit is provided with an automatic recirculation pump protection valve on an outlet pipeline of a main feed water pump so as to ensure that the flow passing through the main feed water pump set is not less than the required minimum flow.

As an important protective device for protecting centrifugal pumps, automatic recirculation pump protection valves are widely used in nuclear islands, conventional islands and power station auxiliary facilities. The prior art automatic recirculation pump protection valve generally includes a valve flap and a guide rod disposed in a valve door, wherein a cylindrical groove is formed in an upper portion of the valve flap, a spring is disposed in the cylindrical groove, the guide rod is inserted into the cylindrical groove in the upper portion of the valve flap, and a through hole is formed in a center of the guide rod. The through hole is used for balancing the pressure in the cylindrical groove, but along with the fact that the spring is circularly compressed and restored between the valve clack and the guide rod to deform, water flows in the through hole rapidly for multiple times, the resonance phenomenon is easily caused, and the protective valve is damaged.

SUMMERY OF THE UTILITY MODEL

The technical problem that this application solved is: the automatic recirculation pump protection valve overcomes the defects of the prior art, is in butt welding connection with a pipeline, is preferably detachable and convenient to maintain, can avoid resonance caused by process flow fluctuation, can automatically adjust the opening of a bypass, avoids cavitation, always enables the flow of a flow through pump to be not lower than the minimum flow, and meets the use requirement of nuclear power. The problems of difficult disassembly and assembly under special working conditions, short service life of the internal parts due to the cavitation phenomenon, vibration and noise are solved.

The technical scheme is as follows:

the utility model provides a butt welding formula nuclear power automatic recirculation pump protection valve, include both ends and the total valve body that is used for leading the intercommunication, be provided with valve clack and guide cylinder in the total valve body, guide cylinder fixed connection is inside total valve body, the guide cylinder outside is located to the valve clack cover, and the valve clack is along the axis direction and the guide cylinder sliding connection of total valve body, be provided with the spring in the valve clack, the through-hole that runs through straight and spring place space intercommunication is seted up to the guide cylinder, the through-hole includes first cavity and the second cavity that distributes in proper order along keeping away from the valve clack direction, the diameter of second cavity is less than first cavity.

A first transition section is arranged between the first cavity and the second cavity, the inner wall of the first transition section is in a cone cylinder shape, and the inner walls at two ends of the first transition section are respectively connected with the first cavity and the second cavity.

The end, far away from the first cavity, of the second cavity is provided with a second transition section and a third cavity, the diameter of the third cavity is larger than that of the first cavity, the inner wall of the second transition section is in a cone cylinder shape, and the inner walls at the two ends of the second transition section are respectively connected with the second cavity and the third cavity.

The damper is arranged at the position of the through hole and comprises a cylindrical pin, the cylindrical pin stretches across the first cavity, and the diameter of the cylindrical pin is smaller than that of the first cavity.

The cylindrical pin is located in the middle of the first chamber.

The damper further comprises a ball located in the first cavity, the ball is located at one end, far away from the valve clack, of the cylindrical pin, the diameter of the ball is smaller than that of the first cavity and larger than that of the second cavity, and the size of the ball cannot pass through a gap between the edge of the cylindrical pin and the first cavity.

The main valve body comprises an upper valve body and a lower valve body, and the upper valve body and the lower valve body are detachably connected through bolts.

One side of lower valve body is connected with the bypass valve body, be provided with multistage pressure reduction assembly in the bypass valve body, multistage pressure reduction assembly includes the fixed part, removal portion and driving lever, the fixed part is fixed to be set up in the valve body, removal portion inserts and locates in the fixed part and can remove along the axis direction of bypass valve body, removal portion inserts and locates opening and closure that different positions realized the bypass valve body in the fixed part, the driving lever articulates in the tip of fixed part, the shaft-like head of valve clack is provided with by the central bellmouth to the outer week both sides radiation, be used for the suit driving lever, the tip butt of driving lever is in the tip of removal portion, the valve clack moves along total valve body and drives the driving lever around the intersection point and rotate, the driving lever drives the removal portion and removes along the axis direction of bypass valve body.

A secondary stepped hole is formed in the lower valve body, the valve clack is provided with a limiting interface, and a stepped surface of the secondary stepped hole and the sister of the limiting interface form a sealing pair; the lower valve body is fixedly connected with a first support frame, and the rod-shaped head of the valve clack is inserted into the central hole of the support frame and is connected with the support frame in a sliding manner along the axial direction of the main valve body; the inside fixedly connected with second support frame of upper valve body, the tip of guide cylinder is fixed to be inserted and is located the centre bore of second support frame.

The first support frame and the second support frame both comprise an outer cylinder and an inner cylinder, the outer cylinder and the inner cylinder are connected through radial ribs, and through holes are formed between the ribs in the middle of the outer cylinder and the inner hollow circle.

In summary, the present application at least includes the following beneficial technical effects:

(1) The utility model realizes the connection and sealing with the upper valve body, the lower valve body and the bypass valve body of the valve by arranging the lower valve body inlet flange, the upper valve body outlet flange and the bypass valve body outlet flange and by means of the fastening bolt and the sealing gasket; the valve can be detached while ensuring butt welding connection with the pipeline, thereby facilitating overhaul and maintenance.

(2) The damper is erected on the guide cylinder, so that the sensitivity of the valve clack to fluid pulses is improved, and resonance is avoided.

(3) The utility model discloses a set up multistage decompression runner, make fluid pressure reduce valve back pressure step by step, guarantee to be not less than saturated vapor pressure to avoid the emergence of the interior spare life-span that "cavitation" caused shortening and vibration, noise.

(4) The utility model discloses a motion that sets up valve clack and multistage decompression subassembly all leans on the hydraulic power to realize, does not have external energy to the automatic recirculation of pump protection valve has been realized.

Drawings

FIG. 1 is a schematic view of the overall structure of a protection valve in an embodiment of the present application;

FIG. 2 is a schematic view of a multi-stage pressure reducing assembly of a protection valve in an embodiment of the application;

FIG. 3 is a schematic view of the damper structure of the protection valve in the embodiment of the present application.

Description of reference numerals: 1. an upper valve body; 2. a lower valve body; 3. a support frame; 4. a guide cylinder; 5. a spring; 6. a valve flap; 7. a sealing gasket; 8. a bypass valve body; 9. a seal ring; 10. a deflector rod; 11. a multi-stage pressure reducing assembly; 12. a lower valve body inlet flange; 13. an upper valve body outlet flange; 14. a bypass valve body outlet flange; 15. a main road runner; 16. a bypass flow channel; 17. a multi-stage pressure reducing flow channel; 18. a damper; 181. a cylindrical pin; 182. a ball; 19. a through hole; 191. a first chamber; 192. a second chamber; 193. a first transition section; 194. a second transition section; 195. a third chamber.

Detailed Description

The present application will now be described in further detail with reference to the following figures and specific examples:

the embodiment of the application discloses automatic recirculation pump protection valve of butt welding formula nuclear power, refer to FIG. 1, including both ends and the total valve body that is used for leading the intercommunication, one side of total valve body is connected with bypass valve body 8, be provided with multistage decompression subassembly 11 in the bypass valve body 8, be provided with valve clack 6 and guide cylinder 4 in the total valve body, 4 fixed connection of guide cylinder are inside total valve body, 4 outsides of guide cylinder are located to 6 covers of valve clack, and valve clack 6 along the axis direction and the 4 sliding connection of guide cylinder of total valve body, be provided with spring 5 in the valve clack 6, the removal and the multistage decompression subassembly 11 linkage of valve clack 6, reach the effect of the total valve body of control and the 11 switching of multistage decompression subassembly.

The main valve body comprises a lower valve body 2 and an upper valve body 1, the upper valve body 1 is connected with the lower valve body 2 through a fastening bolt, and a sealing gasket 7 is arranged between the upper valve body 1 and the lower valve body 2. The connection end of the lower valve body 2 and the upper valve body 1 is provided with a concave opening for matching with the upper valve body 1, and the upper valve body 1 is provided with a convex opening for matching with the lower valve body 2. The flanges at the two ends of the upper valve body 1 are provided with bolt holes, and the outlet flange of the upper valve body 1 and the lower valve body 2 can be connected through fastening bolts.

The lower valve body 2 is provided with a lower valve body 2 inlet flange, the upper valve body 1 is provided with an upper valve body 1 outlet flange, the bypass valve body 8 is provided with a bypass valve body 8 outlet flange, and one end of the inlet flange of the lower valve body 2, the outlet flange of the upper valve body 1 and the outlet flange of the bypass valve body 8 is connected with a process pipeline in a butt welding mode; the other end of the valve body is connected and sealed with the upper valve body 1, the lower valve body 2 and the bypass valve body 8 of the valve by means of a fastening bolt and a sealing gasket 7. The connecting ends of the inlet flanges of the lower valve body 2 and the connecting ends of the outlet flanges of the upper valve body 1 and the upper valve body 1 are provided with end face sealing grooves for placing a sealing gasket 7.

A support frame 3 used for guiding is arranged in the lower valve body 2, a first-stage step hole used for clamping the support frame 3 is arranged in the lower valve body 2, and a rod-shaped head of the valve clack 6 is inserted into a central hole of the support frame 3 and is connected with the support frame 3 in a sliding manner along the axial direction of the total valve body; the upper valve body 1 is internally provided with a support frame 3 for guiding, the upper valve body 1 is internally provided with a step hole for clamping the support frame 3, and the head of the guide cylinder 4 is fixedly inserted into the center hole of the support frame 3 of the upper valve body 1. The support frame 3 is fixedly sleeved on the stepped holes of the upper valve body 1 and the lower valve body 2, the support frame 3 is fixedly sleeved on the upper valve body 1 for the guide cylinder 4, and the support frame 3 is movably sleeved on the lower valve body 2 for the valve clack 6. The support frame 3 comprises an outer cylinder and an inner cylinder, the outer cylinder and the inner cylinder are connected through radial ribs, and through holes 19 are formed between the ribs in the middle of the outer cylinder and the inner hollow circle.

The upper part of the lower valve body 2 is provided with a secondary step hole which can be used for processing a valve seat and forms a pair of sealing pairs with the valve clack 6; two-stage step holes of the lower valve body 2 are used as a main circuit valve cavity, and a pin hole is arranged on a platform at the outlet of a bypass valve cavity of the lower valve body 2 and connected with a bypass valve body 8; the two ends of the lower valve body 2 are provided with threaded holes, and the upper valve body 1 and the inlet flange of the lower valve body 2 can be connected by screwing in a fastening bolt.

The shoulder of the valve clack 6 is processed with a limit interface, a secondary stepped hole is arranged in the lower valve body 2, and the stepped surface of the secondary stepped hole and the sister of the limit interface form a sealing pair. The upper end of the guide cylinder 4 is of a convex structure, and the shoulder part of the convex structure is attached to the lower end surface of the support frame 3 for limiting; the section of the inner cavity of the guide cylinder 4 adopts an approximately convex structure and is used for supporting and limiting the spring 5; the outer part of the guide cylinder 4 is provided with a lower end outer side shaft shoulder used for limiting the valve clack 6; the section of an inner cavity at the upper end of the valve clack 6 adopts a convex structure, and a stepped hole at the bottom of the section is used as a spring 5 seat for supporting and limiting the spring 5; and a bolt hole is formed in the center of the bottom of the step hole and used for hoisting the valve clack 6.

Referring to fig. 2, multistage pressure reducing assembly 11 includes the fixed part, moving part and driving lever 10, the fixed part is fixed to be set up in the valve body, the moving part inserts and locates in the fixed part and can remove along the axis direction of bypass valve body 8, the moving part inserts and locates opening and closure that different positions realized bypass valve body 8 in the fixed part, driving lever 10 articulates in the tip of fixed part, the shaft-like head of valve clack 6 is provided with the horn mouth by the radiation of center outside circumference both sides, be used for suit driving lever 10, the tip butt of driving lever 10 is in the tip of moving part, valve clack 6 moves along total valve body and drives driving lever 10 and rotate around the cross connection point, driving lever 10 drives the moving part and removes along the axis direction of bypass valve body 8. A secondary step hole is formed in the inner cavity of the bypass valve body 8 and used for limiting a fixing part; the flanges at the two ends of the bypass valve body 8 are provided with bolt holes, and the lower valve body 2 and the outlet flange of the bypass valve body 8 can be connected through a fastening bolt; the bypass valve body 8 is provided with the pinhole with lower valve body 2 link. And radial sealing rings 9 with equal size are arranged between the multistage pressure reducing assembly 11 and a bypass valve cavity of the lower valve body 2 and a step hole of the bypass valve body 8.

Referring to fig. 3, the guide cylinder 4 is provided with a through hole 19 which is directly communicated with the space where the spring 5 is located, the through hole 19 comprises a first chamber 191 and a second chamber 192 which are sequentially distributed along the direction away from the valve flap 6, and the diameter of the second chamber 192 is smaller than that of the first chamber 191. A first transition section 193 is arranged between the first cavity 191 and the second cavity 192, the inner wall of the first transition section 193 is in a cone shape, and the inner walls of two ends of the first transition section 193 are respectively connected with the first cavity 191 and the second cavity 192. The end of the second chamber 192 far away from the first chamber 191 is provided with a second transition section 194 and a third chamber 195, the diameter of the third chamber 195 is larger than that of the first chamber 191, the inner wall of the second transition section 194 is in a cone shape, and the inner walls at the two ends of the second transition section 194 are respectively connected with the second chamber 192 and the third chamber 195.

Referring to fig. 3, the damper 18 is disposed at the through hole 19, the damper 18 includes a cylindrical pin 181 and a ball 182, the cylindrical pin 181 spans the first chamber 191, and the diameter of the cylindrical pin 181 is smaller than that of the first chamber 191. The cylindrical pin 181 is located in the middle of the first chamber 191. The ball 182 is located at one end of the cylindrical pin 181 far away from the valve flap 6, the diameter of the ball 182 is smaller than that of the first chamber 191 and larger than that of the second chamber 192, and the size of the ball 182 cannot pass through the gap between the edge of the cylindrical pin 181 and the first chamber 191. Through the shape of the through hole 19 and the arrangement of the damper 18, the pressure relief of the cavity of the spring 5 can be realized, the action of the valve clack 6 can be buffered, and the resonance phenomenon is reduced.

The use method of the product is as follows: the utility model discloses a T shape tee bend pattern will be down on 2 entry flanges of valve body are installed to the water-feeding pump exit position, go up 1 exit flange of valve body and feed through on the former trunk line of system, with 8 exit flange butt welding of bypass valve body on being connected to the pipeline of water-feeding pump entry.

When the water supply quantity required by the system is zero, the valve clack 6 is zero because of the hydraulic power, the sealing surface of the valve clack is attached to the sealing surface of the valve seat of the lower valve body 2, a medium enters the main path flow channel 15 below the sealing surface of the valve clack 6 from the inlet flange of the lower valve body 2, then enters the multistage pressure reduction flow channel 17 through the bypass flow channel 16, the opening degree of the multistage pressure reduction flow channel 17 is maximum at the moment, and then is discharged through the outlet flange of the bypass valve body 8 to enter the inlet pipeline of the water supply pump and enter the water supply pump again, namely the recycling working condition is obtained;

when the required water supply amount of the system is larger than zero but lower than the minimum required flow of the system, the valve clack 6 is lifted due to medium hydraulic power, the sealing surface of the valve clack 6 is separated from the sealing surface of the valve seat of the lower valve body 2, but the valve clack 6 is not enough to be lifted to the shoulder limiting end of the guide cylinder 4, at the moment, the opening of the multistage pressure reduction flow channel 17 is reduced due to movable sleeving of the valve clack 6, the medium enters the main flow channel 15 from the inlet flange of the lower valve body 2 and then is divided into two paths, one path enters the main flow channel 15 from the inlet flange of the lower valve body 2 and then flows out through the outlet flange of the upper valve body 1, the other path enters the multistage pressure reduction flow channel 17 through the bypass flow channel 16, then is discharged through the outlet flange of the bypass valve body 8 and enters the inlet pipeline of the water supply pump, and then enters the water supply pump again;

when the water supply quantity required by the system is larger than the minimum required flow of the system, the valve clack 6 is lifted to the shoulder limiting end of the guide cylinder 4 due to the hydraulic power of the medium, at the moment, the deflector rod 10 pushes the multistage pressure reduction flow passage 17 to be completely closed due to the movable sleeving of the valve clack 6, and the medium enters the main flow passage 15 from the inlet flange of the lower valve body 2 and then flows out through the outlet flange of the upper valve body 1;

through the embodiment, under various working conditions such as starting, running or stopping of the unit, the automatic recirculation pump protection valve can keep an interlocking relationship with the water supply flow and automatically adjust the opening of the multistage decompression assembly 11, so that the flow passing through the main water supply pump group is not less than the required minimum flow. The problems of cavitation and damage of valve internals, vibration of pipelines and noise caused by the cavitation phenomenon in the running process of the power station are avoided. The recycling protection of the main water feeding pump of the nuclear power unit is automatically realized. In addition, the sensitivity of the valve clack 6 to the fluid pulse is improved by erecting a damper 18, and the occurrence of resonance is avoided.

The utility model discloses a satisfy a butt welding formula nuclear power automatic recirculation pump protection valve of nuclear power unit main feed pump low discharge protection demand, make the utility model discloses extensive market prospect has.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: equivalent changes in structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A butt welding type nuclear power automatic recirculation pump protection valve is characterized in that: including both ends and the total valve body of being used to lead the intercommunication, be provided with valve clack (6) and guide cylinder (4) in the total valve body, guide cylinder (4) fixed connection is inside total valve body, guide cylinder (4) outside is located to valve clack (6) cover, and valve clack (6) along the axis direction and guide cylinder (4) sliding connection of total valve body, be provided with spring (5) in valve clack (6), through-hole (19) of running through straight and spring (5) place space intercommunication are seted up in guide cylinder (4), through-hole (19) include along keeping away from first cavity (191) and second cavity (192) that valve clack (6) direction distributed gradually, the diameter of second cavity (192) is less than first cavity (191).

2. The butt welding type nuclear power automatic recirculation pump protection valve according to claim 1, characterized in that: a first transition section (193) is arranged between the first cavity (191) and the second cavity (192), the inner wall of the first transition section (193) is in a cone shape, and the inner walls at two ends of the first transition section (193) are respectively connected with the first cavity (191) and the second cavity (192).

3. The butt welding type nuclear power automatic recirculation pump protection valve according to claim 1, characterized in that: one end, far away from the first cavity (191), of the second cavity (192) is provided with a second transition section (194) and a third cavity (195), the diameter of the third cavity (195) is larger than that of the first cavity (191), the inner wall of the second transition section (194) is in a cone cylinder shape, and the inner walls of the two ends of the second transition section (194) are respectively connected with the second cavity (192) and the third cavity (195).

4. The butt welding type nuclear power automatic recirculation pump protection valve according to claim 1, characterized in that: the damper (18) is arranged at the position of the through hole (19), the damper (18) comprises a cylindrical pin (181), the cylindrical pin (181) stretches across the first cavity (191), and the diameter of the cylindrical pin (181) is smaller than that of the first cavity (191).

5. The butt welding type nuclear power automatic recirculation pump protection valve according to claim 4, characterized in that: the cylindrical pin (181) is located in the middle of the first chamber (191).

6. The butt welding type nuclear power automatic recirculation pump protection valve according to claim 4, characterized in that: the damper (18) further comprises a ball (182) located in the first chamber (191), the ball (182) is located at one end, away from the valve clack (6), of the cylindrical pin (181), the diameter of the ball (182) is smaller than that of the first chamber (191) and larger than that of the second chamber (192), and the size of the ball (182) cannot pass through a gap between the edge of the cylindrical pin (181) and the first chamber (191).

7. The butt welding type nuclear power automatic recirculation pump protection valve according to claim 1, characterized in that: the main valve body comprises an upper valve body (1) and a lower valve body (2), and the upper valve body (1) and the lower valve body (2) are detachably connected through bolts.

8. The butt welding type nuclear power automatic recirculation pump protection valve according to claim 7, characterized in that: one side of lower valve body (2) is connected with bypass valve body (8), be provided with multistage decompression subassembly (11) in bypass valve body (8), multistage decompression subassembly (11) include the fixed part, movable part and driving lever (10), the fixed part is fixed to be set up in the valve body, the movable part is inserted and is located in the fixed part and can move along the axis direction of bypass valve body (8), the movable part is inserted and is located different positions in the fixed part and realize opening and closing of bypass valve body (8), driving lever (10) articulate in the tip of fixed part, the shaft-like head of valve clack (6) is provided with the horn mouth by the outside circumference both sides radiation in center, be used for suit driving lever (10), the tip butt in the tip of movable part of driving lever (10), valve clack (6) move along total valve body and drive driving lever (10) and rotate around the intersection point, driving lever (10) drive movable part along the axis direction removal of bypass valve body (8).

9. The butt welding type nuclear power automatic recirculation pump protection valve according to claim 7, characterized in that: a secondary step hole is formed in the lower valve body (2), a limiting interface is arranged on the valve clack (6), and a sealing pair is formed by the step surface of the secondary step hole and the limiting interface; the lower valve body (2) is fixedly connected with a support frame (3) inside, and the rod-shaped head of the valve clack (6) is inserted into the center hole of the support frame (3) of the lower valve body (2) and is connected with the support frame (3) in a sliding manner along the axial direction of the total valve body; the inner part of the upper valve body (1) is fixedly connected with a support frame (3), and the end part of the guide cylinder (4) is fixedly inserted into a center hole of the support frame (3) of the upper valve body (1).

10. The butt welding type nuclear power automatic recirculation pump protection valve according to claim 9, characterized in that: the supporting frames (3) comprise an outer cylinder and an inner cylinder, the outer cylinder and the inner cylinder are connected through radial ribs, and through holes (19) are formed between the ribs in the middle of the outer cylinder and the inner cylinder.