Nuclear power station steam energy supply feed pump structure

Abstract

The nuclear power station steam energy supply water feeding pump structure comprises a positioning base plate, two limiting bearing platforms are fixedly installed on the positioning base plate, an outer cylinder is installed on the limiting bearing platforms in a limiting mode, a pump core structure is movably installed in the outer cylinder, and a variable-diameter inlet pipeline and an outlet pipeline are arranged on the outer cylinder. The two eccentric variable-diameter butt joint pipes are connected with the variable-diameter inlet pipeline and the variable-diameter outlet pipeline, under the condition that variable-diameter pressurization is kept, the interference problem caused by the fact that the distance between the inlet pipeline and the outlet pipeline is short cannot be generated, the flow and lift needed by nuclear power high-temperature steam energy supply are met, heat preservation additional installation is convenient, and the service life of the nuclear power high-temperature steam energy supply system is prolonged. The guide keys are matched with the positioning guide grooves, so that mounting, positioning and overhauling of the outer barrel and the pump core structure are facilitated, meanwhile, heat shock expansion of the pump body can be well restrained and guided through matched mounting of the two limiting bearing platforms, the radial limiting pump feet and the axial limiting pump feet, and stable operation of a unit is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of steam-powered water supply pumps for nuclear power plants, in particular to a steam-powered water supply pump structure for nuclear power plants. Background Art

[0002] The existing nuclear power high temperature steam energy feed water pump has the following technical defects:

[0003] 1. The flow rate and head required for the nuclear power high-temperature steam energy feed water pump are relatively high, and the floor space of the plant is limited. If multiple pump groups are used to occupy too much floor space, the plant design will be too large. In addition, the inlet and outlet pipes of the nuclear power high-temperature steam energy feed water pump are close, which will interfere with the installation of insulation.

[0004] 2. Since the medium delivered by the nuclear power high-temperature steam energy feed water pump is high-temperature steam, it is difficult to install, locate and repair the pump unit, and the ordinary structure pump has a weak ability to withstand thermal shock.

[0005] Therefore, in view of the shortcomings of the prior art, it is necessary to provide a nuclear power plant steam energy feed water pump structure to solve the shortcomings of the prior art. Utility Model Content

[0006] The purpose of the utility model is to avoid the deficiencies of the prior art and provide a nuclear power plant steam energy feed water pump structure, which is connected to a variable diameter inlet pipe and an outlet pipe through two eccentric variable diameter butt pipes. Under the condition of variable diameter pressurization, there will be no interference problem caused by the close distance between the inlet and outlet pipes, and the flow rate and head required for nuclear power high-temperature steam energy supply are met. It is also convenient to install thermal insulation. The cooperation of the guide key and the positioning guide groove facilitates the installation, positioning and maintenance of the outer cylinder and the pump core structure. At the same time, the cooperation installation of two limit bearing platforms with the radial limit pump foot and the axial limit pump foot can well restrain and guide the thermal shock expansion of the pump body, thereby ensuring the stable operation of the unit.

[0007] The above-mentioned purpose of the utility model is achieved through the following technical means.

[0008] Provided is a nuclear power plant steam energy feed water pump structure, comprising a positioning chassis, two limit bearing platforms are fixedly installed on the positioning chassis, an outer cylinder is installed at the upper limit of the limit bearing platform, a pump core structure is movably installed inside the outer cylinder, and a variable diameter inlet pipe and an outlet pipe are arranged on the outer cylinder;

[0009] The top diameter of the variable diameter inlet pipe is larger than the bottom diameter, and the top flanges of the variable diameter inlet pipe and the outlet pipe are connected with eccentric variable diameter butt pipes. The top diameters of the two eccentric variable diameter butt pipes are larger than the bottom diameter, and the side walls on the opposite side of the two eccentric variable diameter butt pipes are vertical side walls.

[0010] Specifically, each limit bearing platform is equipped with a radial limit guide key and an axial limit guide key, the outer cylinder includes a free end and a driving end, two radial limit pump feet are fixedly installed on the outside of the free end, and two axial limit pump feet are fixedly installed on the outside of the driving end, the radial limit pump feet and the radial limit guide key are snap-fitted, and the axial limit pump feet and the axial limit guide key are snap-fitted, the limit bearing platform and the radial limit pump feet and the axial limit pump feet are installed by locking bolts, and height adjustment bolts are spirally installed on the radial limit pump feet and the axial limit pump feet, and the height adjustment bolts are rotationally matched with the limit bearing platform.

[0011] Preferably, the pump core structure includes a rotor body, on which a pump cover is rotatably mounted, the pump cover and the outer cylinder are bolted, a boosting section is fixedly mounted on the pump cover, an impeller is mounted on the rotor body inside the boosting section, a suction box is fixedly mounted on the end of the boosting section away from the pump cover, the top of the suction box is connected to the variable diameter inlet pipe, a positioning guide groove is installed on the suction box, and an installation guide key is bolted to the end of the outer cylinder away from the pump cover, and the installation guide key is snap-fitted with the positioning guide groove.

[0012] Specifically, an inserting tapered portion is provided at one end of the rotor body away from the pump cover, and the inserting tapered portion is inserted into the interior of the coupling. A limit inserting key is also installed on the coupling, and the limit inserting key is movably inserted into the interior of the inserting tapered portion.

[0013] The utility model connects the variable diameter inlet pipe and the outlet pipe through two eccentric variable diameter butt pipes. Under the condition of variable diameter pressurization, there will be no interference problem caused by the close distance between the inlet and outlet pipes. The flow rate and head required for nuclear power high-temperature steam energy supply are met, and it is convenient to install thermal insulation. The cooperation of the guide key and the positioning guide groove facilitates the installation, positioning and maintenance of the outer cylinder and the pump core structure. At the same time, the cooperation installation of the two limit bearing platforms and the radial limit pump feet and the axial limit pump feet can well restrain and guide the thermal shock expansion of the pump body, thereby ensuring the stable operation of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention is further described with reference to the accompanying drawings, but the contents in the accompanying drawings do not constitute any limitation to the present invention.

[0015] Figure 1 The utility model is a cross-sectional structural schematic diagram of the installation of an outer cylinder and a pump core structure of a nuclear power plant steam energy feed water pump structure.

[0016] Figure 2 The utility model is a main structural schematic diagram of a steam energy supply water pump structure for a nuclear power plant.

[0017] Figure 3 The utility model is a top view of a steam-powered water supply pump structure for a nuclear power plant.

[0018] from Figures 1 to 3 It includes: 1. Positioning chassis;

[0019] 2. Limit bearing platform;

[0020] 3. Outer cylinder;

[0021] 4. Pump core structure;

[0022] 5. Variable diameter inlet pipe;

[0023] 6. Export pipeline;

[0024] 7. Eccentric reducer butt joint;

[0025] 8. Radial limit guide key;

[0026] 9. Axial limit guide key;

[0027] 10. Free end;

[0028] 11. Driving end;

[0029] 12. Radial limit pump foot;

[0030] 13. Axial limit pump foot;

[0031] 14. Locking bolt;

[0032] 15. Height adjustment bolt;

[0033] 16. Rotor body;

[0034] 17. Pump cover;

[0035] 18. Pressurization section;

[0036] 19. Impeller;

[0037] 20. Intake box;

[0038] 21. Positioning guide groove;

[0039] 22. Install the guide key;

[0040] 23. Insert the tapered part;

[0041] 24. Coupling;

[0042] 25. Limit plug-in key. DETAILED DESCRIPTION

[0043] The utility model is further described in conjunction with the following embodiments.

[0044] Example 1.

[0045] like Figure 1-3 As shown, a steam-powered water supply pump structure for a nuclear power plant includes a positioning chassis 1, on which two limit bearing platforms 2 are fixedly installed, an outer cylinder 3 is installed on the upper limit position of the limit bearing platforms 2, a pump core structure 4 is movably installed inside the outer cylinder 3, and a variable diameter inlet pipe 5 and an outlet pipe 6 are provided on the outer cylinder 3.

[0046] The present application is used for the steam function of a nuclear power plant. First, the overall equipment is fixed by positioning the chassis 1, the outer cylinder 3 is fixed by the limiting support 2, and then the overall pump core structure 4 is pushed into the interior of the outer cylinder 3 for installation, and the medium enters and flows out through the variable diameter inlet pipe 5 and the outlet pipe 6.

[0047] The top diameter of the variable diameter inlet pipe 5 is larger than the bottom diameter. The top flanges of the variable diameter inlet pipe 5 and the outlet pipe 6 are connected with eccentric variable diameter butt joints 7. The top diameters of the two eccentric variable diameter butt joints 7 are larger than the bottom diameters. The side walls on the opposite sides of the two eccentric variable diameter butt joints 7 are vertical side walls.

[0048] The top diameter of the variable-diameter inlet pipe 5 itself is DN200, and the bottom diameter connected to the pump core structure 4 is smaller. The bottom diameter of the eccentric variable-diameter butt joint 7 connected to the variable-diameter inlet pipe 5 is the same as the top diameter of the variable-diameter inlet pipe 5, which is DN200. The top diameter of this eccentric variable-diameter butt joint 7 is reduced to DN300, and the center of the top opening of this eccentric variable-diameter butt joint 7 is different from the center of the bottom opening, which belongs to eccentric diameter reduction. The bottom diameter of the eccentric variable-diameter butt joint 7 connected to the outlet pipe 6 is the same as the top diameter of the outlet pipe 6, which is DN150. The top diameter of this eccentric variable-diameter butt joint 7 is reduced to DN250, and the center of the top opening of this eccentric variable-diameter butt joint 7 is different from the center of the bottom opening, which belongs to eccentric diameter reduction. The opposite sides of the two eccentric variable-diameter butt joints 7 are kept vertical to maintain the distance between the inlet and outlet pipes 6 to prevent interference problems caused by the close distance between the inlet and outlet pipes 6.

[0049] A radial limit guide key 8 and an axial limit guide key 9 are installed on each limit bearing platform 2. The outer cylinder 3 includes a free end 10 and a driving end 11. Two radial limit pump feet 12 are fixedly installed on the outside of the free end 10, and two axial limit pump feet 13 are fixedly installed on the outside of the driving end 11. The radial limit pump feet 12 and the radial limit guide key 8 are snap-fitted together, and the axial limit pump feet 13 and the axial limit guide key 9 are snap-fitted together. The limit bearing platform 2 is installed with the radial limit pump feet 12 and the axial limit pump feet 13 by locking bolts 14. Height adjustment bolts 15 are spirally installed on the radial limit pump feet 12 and the axial limit pump feet 13, and the height adjustment bolts 15 are rotationally matched with the limit bearing platform 2.

[0050] The radial limit guide key 8 and the axial limit guide key 9 are clipped together with the limit pump feet on the free end 10 and the driving end 11, so that the outer cylinder 3 can be radially limited and moved or axially limited and moved. At the same time, the position of the outer cylinder 3 can be locked by the locking bolt 14, so that the thermal shock expansion of the pump body is well restrained and guided. The bottom of the height adjustment bolt 15 is rotationally matched with the limit support 2, and the height adjustment bolt 15 is screwed with the limit pump foot to realize the height adjustment of the limit pump foot, which is convenient for adjusting the posture of the entire outer cylinder 3.

[0051] The pump core structure 4 includes a rotor body 16, on which a pump cover 17 is rotatably mounted, the pump cover 17 and the outer cylinder 3 are bolted, a boost section 18 is fixedly mounted on the pump cover 17, an impeller 19 is mounted on the rotor body 16 inside the boost section 18, a suction box 20 is fixedly mounted on one end of the boost section 18 away from the pump cover 17, the top of the suction box 20 is connected to the variable diameter inlet pipe 5, a positioning guide groove 21 is installed on the suction box 20, and an installation guide key 22 is bolted to one end of the outer cylinder 3 away from the pump cover 17, and the installation guide key 22 is snap-fitted with the positioning guide groove 21.

[0052] The pump core structure 4 can be radially limited by the engagement of the installation guide key 22 with the positioning guide groove 21. When the pump core structure 4 is pushed in, the positioning guide groove 21 and the installation guide key 22 can be engaged. The rotation of the rotor body 16 drives the impeller 19 to rotate inside the boosting section 18, pressurizing the medium, and the medium flows into the variable diameter inlet pipe 5 through the suction box 20.

[0053] An inserting cone 23 is provided at one end of the rotor body 16 away from the pump cover 17 . The inserting cone 23 is inserted into the interior of the coupling 24 . A limit inserting key 25 is also installed on the coupling 24 . The limit inserting key 25 is movably inserted into the interior of the inserting cone 23 .

[0054] The outside of the rotor body 16 is plugged into the coupling 24 for easy installation and removal. At the same time, the torque is transmitted by plugging the limiting plug-in key 25 on the coupling 24 into the inside of the rotor body 16 .

[0055] The utility model is connected with the variable diameter inlet pipe 5 and the outlet pipe 6 through two eccentric variable diameter butt pipes 7. Under the condition of variable diameter pressurization, there will be no interference problem caused by the close distance between the inlet and outlet pipes 6, which meets the flow rate and head required for nuclear power high-temperature steam energy supply, and is convenient for the installation of thermal insulation. The cooperation of the guide key and the positioning guide groove 21 facilitates the installation, positioning and maintenance of the outer cylinder 3 and the pump core structure 4. At the same time, the cooperation installation of the two limit bearing platforms 2 and the radial limit pump feet 12 and the axial limit pump feet 13 can well restrain and guide the thermal shock expansion of the pump body, thereby ensuring the stable operation of the unit.

Claims

1. A steam-powered feedwater pump structure for a nuclear power plant, characterized in that: It comprises a positioning chassis, on which two limit bearing platforms are fixedly installed, an outer cylinder is installed at the upper limit position of the limit bearing platform, a pump core structure is movably installed inside the outer cylinder, and a variable diameter inlet pipe and an outlet pipe are provided on the outer cylinder; The top diameter of the variable diameter inlet pipe is larger than the bottom diameter, the top flanges of the variable diameter inlet pipe and the outlet pipe are connected with eccentric variable diameter butt pipes, the top diameters of the two eccentric variable diameter butt pipes are larger than the bottom diameter, and the side walls on the opposite side of the two eccentric variable diameter butt pipes are vertical side walls.

2. A nuclear power plant steam energy feedwater pump structure according to claim 1, characterized in that: Each of the limit bearing platforms is installed with a radial limit guide key and an axial limit guide key, the outer cylinder includes a free end and a driving end, the free end is externally fixedly installed with two radial limit pump feet, the driving end is externally fixedly installed with two axial limit pump feet, the radial limit pump feet and the radial limit guide key are snap-fitted together, the axial limit pump feet and the axial limit guide key are snap-fitted together, the limit bearing platform is installed with the radial limit pump feet and the axial limit pump feet through locking bolts, the radial limit pump feet and the axial limit pump feet are spirally installed with height adjustment bolts, and the height adjustment bolts are rotationally fitted with the limit bearing platform.

3. A nuclear power plant steam energy feedwater pump structure according to claim 2, characterized in that: The pump core structure includes a rotor body, a pump cover is rotatably mounted on the rotor body, the pump cover and the outer cylinder are bolted, a boost section is fixedly mounted on the pump cover, an impeller is mounted on the rotor body inside the boost section, a suction box is fixedly mounted on the end of the boost section away from the pump cover, the top of the suction box is connected to the variable diameter inlet pipe, a positioning guide groove is installed on the suction box, and an installation guide key is bolted to the end of the outer cylinder away from the pump cover, and the installation guide key is snap-fitted with the positioning guide groove.

4. A nuclear power plant steam energy feedwater pump structure according to claim 3, characterized in that: An inserting conical portion is provided at one end of the rotor body away from the pump cover, and the inserting conical portion is inserted into the interior of the coupling. A limit inserting key is also installed on the coupling, and the limit inserting key is movably inserted into the interior of the inserting conical portion.

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