Cooling device of nuclear power main pump motor winding coil

Abstract

The invention belongs to the technical field of nuclear power, and particularly relates to a cooling device of a nuclear power main pump motor winding coil. Overall fixing is achieved in the mode that the side beams and the finned tubes are welded to the tube plates, the continuous cooling effect of the device is achieved through U-shaped circulating flow of equipment cooling water, and the function of preventing and controlling foreign matter is achieved through the mesh enclosure. When a main pump motor winding of a nuclear power plant is cooled, shaking in the cooling process is avoided, meanwhile, damage of foreign matter to the finned tube is avoided, the problem of adapting to an air cooler of an RSR series nuclear power main pump motor can be effectively solved, and the risks that the temperature of the motor winding is increased and the main pump motor is burnt down are reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of nuclear power, and particularly relates to a cooling device for the winding coils of a nuclear power main pump motor. Background Art

[0002] The reactor coolant pump belongs to a key sensitive device in the primary loop of a nuclear power plant. The driving force source of this device is an air-cooled squirrel-cage induction motor, and the windings inside the motor will heat up during power operation. Currently, there is no air cooler suitable for the RSR series of nuclear power main pump motors on the market. The original equipment manufacturer of the existing equipment has gone bankrupt and been restructured, and due to long-term vibration and erosion, there have been damages, cracks, and bending phenomena, resulting in leakage of the equipment cooling water. If the existing equipment continues to deteriorate, it will be difficult to meet the operating function requirements of the nuclear power main pump motor. By then, the cooling effect of the air cooler will decrease, the temperature of the motor windings will increase, and there is a risk of burning out the main pump motor. Therefore, it is urgent to ensure the safety performance of the main pump motor during the operation of the nuclear power plant. Summary of the Invention

[0003] To overcome the problems existing in the related art, a cooling device for the winding coils of a nuclear power main pump motor is provided.

[0004] The device includes: a front tube sheet, a rear tube sheet, finned tubes, a front cover plate, and a rear cover plate;

[0005] Each finned tube includes a cooling tube bundle and a plurality of heat-dissipating copper sheets. The outer side of the cooling tube bundle is fixedly connected with a plurality of heat-dissipating copper sheets by welding to form a finned tube in a feather-wing shape;

[0006] A plurality of finned tube through-holes are respectively formed on the front tube sheet and the rear tube sheet; each finned tube passes through the finned tube through-holes provided oppositely on the front tube sheet and the rear tube sheet. After expansion, each finned tube is in interference fit with the finned tube through-hole it passes through, and the front end of each finned tube is fixedly connected with the front tube sheet by welding, and the rear end of each finned tube is fixedly connected with the rear tube sheet;

[0007] The front cover plate is fixedly connected to the front end of the front tube sheet, and an inlet chamber is formed between the front cover plate and the front tube sheet. The rear cover plate is fixedly connected to the rear end of the rear tube sheet by bolts, nuts, and pins, and an outlet chamber is formed between the rear tube sheet and the rear cover plate; the pipeline at the water outlet end of the cooling water pump is fixedly connected to the cooling water inlet at the lower end of the front cover plate, and the pipeline at the water return end of the cooling water pump is fixedly connected to the cooling water outlet at the upper end of the front cover plate;

[0008] Driven by the driving force of the equipment cooling water pump, the cooling water enters the inlet chamber from the output end pipeline. As the water level of the cooling water in the inlet chamber rises, the cooling water passes through each finned tube in the order from bottom to top and enters the outlet chamber. After the outlet chamber is filled with the cooling water, the cooling water flows back to the cooling water pump through the pipeline at the return end; the high-temperature air dissipated from the main pump motor winding realizes the air cooling effect through heat exchange with the finned tube, and the cooled air enters the winding coil again, and the winding cooling effect is realized through the heat exchange between the cooling air and the winding coil.

[0009] In a possible implementation manner, the mesh cover is fixedly connected between the front cover plate and the rear cover plate, and covers a plurality of finned tubes inside.

[0010] In a possible implementation manner, the mesh cover is a dense mesh.

[0011] In a possible implementation manner, the fixed-end angle steel on the top side is fixedly connected to the front tube sheet by bolts; the sliding-end angle steel on the top side is fixedly connected to the rear tube sheet by bolts; the fixed-end angle steel on the bottom side is closely connected to the front tube sheet; the sliding-end angle steel on the bottom side is closely connected to the rear tube sheet;

[0012] The fixed-end angle steel is also fixedly connected to the front end of the side beam on the top side; the sliding-end angle steel is also fixedly connected to the end of the side beam on the top side; the fixed-end angle steel is also fixedly connected to the front end of the side beam on the bottom side; the sliding-end angle steel is also fixedly connected to the end of the side beam on the bottom side.

[0013] In a possible implementation manner, a "day" - shaped front cover plate gasket is provided between the front cover plate and the front tube sheet; a "mouth" - shaped front cover plate gasket is provided between the rear tube sheet and the rear cover plate.

[0014] In a possible implementation manner, a long - neck flange is welded to the cooling water inlet and the cooling water outlet respectively; the long - neck flange at the cooling water inlet is fixedly connected to the equipment cooling water inlet flange, and the long - neck flange at the outlet is fixedly connected to the equipment cooling water inlet flange by bolts and nuts.

[0015] In a possible implementation manner, a sealing gasket is provided between the long - neck flange and the equipment cooling water inlet flange.

[0016] The beneficial effects disclosed are as follows: The cooling device for the nuclear power main pump motor winding coil provided by the present disclosure realizes overall fixation through the welding method of the side beam and the finned tube with the tube sheet, realizes the continuous cooling effect of the device through the U - shaped circulation flow of the equipment cooling water, and realizes the prevention and control function of external foreign objects through the mesh cover. When cooling the main pump motor winding of the nuclear power plant, it avoids shaking during the cooling process and also avoids the damage of foreign objects to the finned tubes, can effectively solve the problem of adapting the air cooler for the RSR series nuclear power main pump motor, and reduce the risk of increasing the motor winding temperature and burning out of the main pump motor. Description of the Drawings

[0017] Figure 1 It is a schematic diagram of a cooling device for the motor winding coil of a nuclear power main pump shown in an embodiment of the present disclosure.

[0018] Figure 2 It is a schematic diagram of the welded structure of a finned tube and a tube sheet shown in an embodiment of the present disclosure.

[0019] Figure 3 It is a schematic diagram of the front cover plate structure shown in an embodiment of the present disclosure.

[0020] Figure 4 It is a schematic diagram of the side beam connection shown in an embodiment of the present disclosure.

[0021] In the figure:

[0022] 1: Front cover plate, 2: Front tube sheet, 3: Front cover plate gasket, 4: Finned tube, 5: Rear tube sheet,

[0023] 6: Rear cover plate, 7: Rear cover plate gasket, 8: Side beam, 9: Mesh cover, 10: Fixed end angle steel,

[0024] 11: Mobile end angle steel, 13: Nameplate, 14: Long neck flange, 15: Equipment cooling water inlet flange,

[0025] 16: Sealing gasket, 21: Rivet, 22: Pin, 25: Bolt, 26: Nut, 30: Fastening structure;

[0026] N1: Cooling water inlet; N2: Cooling water outlet. Detailed Embodiments

[0027] The present disclosure will be further described in detail below with reference to the drawings and specific embodiments.

[0028] Unless otherwise defined, the technical and scientific terms used in the present disclosure have the same meanings as those commonly understood by those skilled in the art to which the present disclosure belongs; the terms used in the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure; the term "including" and any variations thereof in the text of the present disclosure are intended to cover non-exclusive inclusion. Obviously, the embodiments described in the present disclosure are only a part of the embodiments of the present disclosure, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present disclosure without creative efforts belong to the scope of protection of the present disclosure.

[0029] References to "embodiments" in this disclosure mean that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the disclosure. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment each time, nor are they independent or alternative embodiments mutually exclusive of other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0030] Figure 1 is a schematic diagram of a cooling device for the motor winding coil of a nuclear power main pump shown in an embodiment of the present disclosure. Figure 2 is a schematic diagram of the welded structure of a finned tube and a tube sheet shown in an embodiment of the present disclosure. Figure 3 is a schematic diagram of the front cover plate structure shown in an embodiment of the present disclosure. Figure 4 is a schematic diagram of the side beam connection shown in an embodiment of the present disclosure. As Figures 1 to 4 shown, the device includes: a front tube sheet 2, a rear tube sheet 5, finned tubes 4, a front cover plate 1, a front cover plate gasket 3, a rear cover plate 6, a rear cover plate gasket 7, a mesh cover 9, and side beams 8.

[0031] Each finned tube 4 includes a cooling tube bundle and a plurality of heat dissipation copper sheets. The outer side of the cooling tube bundle is fixedly connected to the plurality of heat dissipation copper sheets by welding to form a finned tube 4 in a feather-wing shape. The number of finned tubes 4 can be set according to actual heat dissipation requirements. For example, 110 finned tubes can be set.

[0032] A plurality of finned tube through holes are respectively formed on the front tube sheet 2 and the rear tube sheet 5. Each finned tube passes through the finned tube through holes oppositely arranged on the front tube sheet 2 and the rear tube sheet 5. After expansion, each finned tube 4 is in interference fit with the finned tube through hole it passes through. As Figure 2 shown, the front end of each finned tube 4 is fixedly connected to the front tube sheet 2 by welding, and the rear end of each finned tube 4 is fixedly connected to the rear tube sheet 5. Under the stabilizing effect of welding, each finned tube 4 and the two end tube sheets 2 and 5 form a stable whole.

[0033] The front cover plate 1 can be fixedly connected to the front end of the front tube sheet 2 by bolts 25, nuts 26, and pins 22. An inlet chamber is formed between the front cover plate 1 and the front tube sheet 2. A "day" - shaped front cover plate gasket 3 can be provided between the front cover plate 1 and the front tube sheet 2 to increase the structural stability between the front cover plate 1 and the front tube sheet 2; the rear cover plate 6 can be fixedly connected to the rear end of the rear tube sheet 5 by bolts 25, nuts 26, and pins 22. An outlet chamber is formed between the rear tube sheet 5 and the rear cover plate 6. A "mouth" - shaped front cover plate gasket 7 is provided between the rear tube sheet 5 and the rear cover plate 6 to increase the structural stability between the rear tube sheet 5 and the rear cover plate 6.

[0034] The pipeline at the water outlet end of the cooling water pump is connected to the cooling water inlet N1 at the lower end of the front cover plate 1 through the long-neck flange 14 and the equipment cooling water inlet flange 15, and the pipeline at the water return end of the cooling water pump is connected to the cooling water outlet N2 at the upper end of the front cover plate 1 through the long-neck flange 14 and the equipment cooling water inlet flange 15.

[0035] Under the driving force of the equipment cooling water pump, the cooling water enters the inlet chamber from the output pipeline. As the water level of the cooling water in the inlet chamber increases, the cooling water passes through each finned tube in the order from bottom to top and enters the outlet chamber. After the outlet chamber is filled with the cooling water, the cooling water flows back to the cooling water pump through the pipeline at the water return end.

[0036] The high-temperature air dissipated from the main pump motor winding realizes the air cooling effect through heat exchange with the finned tubes. The cooled air enters the winding coil again, and the winding cooling effect is realized through the heat exchange between the cooling air and the winding coil.

[0037] The wire mesh cover 9 is fixedly connected between the front cover plate 1 and the rear cover plate 6 and covers multiple finned tubes 4 inside. The wire mesh cover 9 can be, for example, a wire mesh with dense meshes, which is used to prevent foreign objects from entering the finned tubes 4.

[0038] The fixed-end angle steel 10 located on the top side is fixedly connected to the front tube sheet 2 by bolts. The sliding-end angle steel 11 located on the top side is fixedly connected to the rear tube sheet 5 by bolts. The fixed-end angle steel 10 located on the bottom side is closely connected to the front tube sheet 2. The sliding-end angle steel 11 located on the bottom side is closely connected to the rear tube sheet 5.

[0039] The fixed-end angle steel 10 is also fixedly connected to the front end of the side beam 8 located on the top side, for example, by using the fastening structure 30. The sliding-end angle steel 11 is also fixedly connected to the end of the top-side side beam 8. The fixed-end angle steel 10 is also fixedly connected to the front end of the side beam 8 located on the bottom side. The sliding-end angle steel 11 is also fixedly connected to the end of the side beam 8 located on the bottom side. In this way, each finned tube 4, the front tube sheet 2, the rear tube sheet 5, the fixed-end angle steel 10, the sliding-end angle steel 11, and the side beam 8 are closely connected to form a stable whole.

[0040] A long-neck flange 14 is welded to each of the cooling water inlet and the cooling water outlet. The long-neck flange 14 located at the cooling water inlet is fixedly connected to the equipment cooling water inlet flange 15 by bolts and nuts, and two sealing gaskets 16 are provided between the long-neck flange 14 and the equipment cooling water inlet flange 15. The long-neck flange 14 located at the outlet is fixedly connected to the equipment cooling water inlet flange 15 by bolts and nuts, and two sealing gaskets 16 are provided between the long-neck flange 14 and the equipment cooling water inlet flange 15.

[0041] In a possible implementation manner, a cooling device for a nuclear power main pump motor winding coil provided by the present disclosure operates in the following manner.

[0042] When the motor is running, the operating temperature of the motor winding rises, generating hot air. The hot air is blown outwards under the action of the motor rotor, and the blown-out gas passes through the finned tube array of the cooling device, exchanging heat to the cooling device. The equipment cooling water in the cooling device is driven by the equipment cooling water pump and flows into the long-neck flange of the cooling device through the pipeline, and further fills the inside of each finned tube. The equipment cooling water inside each finned tube exchanges heat with the hot air through the tube wall and fins, cooling the air, and the equipment cooling water rises in temperature and returns to the cooling device for cooling. Thus, a cycle is formed to cool the motor winding.

[0043] The embodiments of the present disclosure have been described above. The above description is exemplary and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles of the embodiments, the practical application, or the improvement of the technology in the market, or to enable other ordinary skill in the art in this technical field to understand the disclosed embodiments.

Claims

1. A cooling device for the winding coils of a nuclear power main pump motor, characterized in that, The device includes: a front tube sheet, a rear tube sheet, finned tubes, a front cover plate, and a rear cover plate; Each finned tube includes a cooling tube bundle and a plurality of heat-dissipating copper fins. A plurality of heat-dissipating copper fins are fixedly connected to the outside of the cooling tube bundle by welding to form a finned tube in a feather-wing shape; A plurality of finned tube through-holes are respectively formed on the front tube sheet and the rear tube sheet; each finned tube passes through the finned tube through-holes arranged oppositely on the front tube sheet and the rear tube sheet. After expansion, each finned tube is in interference fit with the finned tube through-hole it passes through, and the front end of each finned tube is fixedly connected to the front tube sheet by welding, and the rear end of each finned tube is fixedly connected to the rear tube sheet; The front cover plate is fixedly connected to the front end of the front tube sheet, and an inlet chamber is formed between the front cover plate and the front tube sheet. The rear cover plate is fixedly connected to the rear end of the rear tube sheet by bolts, nuts and pins, and an outlet chamber is formed between the rear tube sheet and the rear cover plate; the pipeline at the water outlet end of the cooling water pump is fixedly connected to the cooling water inlet at the lower end of the front cover plate, and the pipeline at the water return end of the cooling water pump is fixedly connected to the cooling water outlet at the upper end of the front cover plate; Driven by the driving force of the equipment cooling water pump, the cooling water enters the inlet chamber from the output end pipeline. As the water level of the cooling water in the inlet chamber increases, the cooling water passes through each finned tube in the order from bottom to top and enters the outlet chamber. After the outlet chamber is filled with the cooling water, the cooling water flows back to the cooling water pump through the pipeline at the water return end; the high-temperature air dissipated from the main pump motor winding realizes the air cooling effect through heat exchange with the finned tube, and the cooled air enters the winding coil again, and the winding is cooled through the heat exchange between the cooling air and the winding coil.

2. The device according to claim 1, characterized in that A wire mesh cover is fixedly connected between the front cover plate and the rear cover plate, and a plurality of finned tubes are covered inside.

3. The device according to claim 2, wherein The wire mesh cover is a dense mesh.

4. The device according to claim 1, characterized in that, The fixed-end angle steel on the top side is fixedly connected to the front tube sheet by bolts; the sliding-end angle steel on the top side is fixedly connected to the rear tube sheet by bolts; the fixed-end angle steel on the bottom side is closely connected to the front tube sheet; the sliding-end angle steel on the bottom side is closely connected to the rear tube sheet; The fixed-end angle steel is also fixedly connected to the front end of the side beam on the top side; the sliding-end angle steel is also fixedly connected to the end of the top-side side beam; the fixed-end angle steel is also fixedly connected to the front end of the side beam on the bottom side; the sliding-end angle steel is also fixedly connected to the end of the bottom-side side beam.

5. The device according to claim 1, characterized in that, A day-shaped front cover plate gasket is provided between the front cover plate and the front tube sheet; a mouth-shaped front cover plate gasket is provided between the rear tube sheet and the rear cover plate.

6. The device according to claim 1, characterized in that, A long-neck flange is welded to the cooling water inlet and the cooling water outlet respectively; the long-neck flange at the cooling water inlet is fixedly connected to the equipment cooling water inlet flange, and the long-neck flange at the outlet is fixedly connected to the equipment cooling water inlet flange by bolts and nuts.

7. The device according to claim 6, characterized in that, A sealing gasket is provided between the long-neck flange and the equipment cooling water inlet flange.

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