A heat shield cavity structure for a low pressure safety injection pump of a nuclear power plant

Abstract

The application discloses a heat shield cavity structure for a low-pressure emergency injection pump of a nuclear power plant, relates to the technical field of pump bodies, and comprises two heat shield cavities arranged on the outer side walls of the two ends of the pump body and two heat shield pressing plates arranged at the two ends of the pump body, wherein the heat shield cavities are arranged with outer side openings, and the heat shield pressing plates are fixedly arranged on the pump body and cover the opening ends of the heat shield cavities. The heat shield cavities are arranged on the outer side walls of the pump body, the separation from the medium in the pump body is realized, the cooling water medium in the heat shield cavities is isolated from the radiation medium of the pump body, and the risk of contaminating the cooling water supply system due to the mutual contact of the media is avoided.

Description

Technical Field

[0001] This application relates to the field of pump technology, and in particular to a heat shield cavity structure for a low-pressure safety injection pump in a nuclear power plant. Background Technology

[0002] The heat shield cavity of a low-pressure safety injection pump is a special chamber structure that surrounds the pump. Its main function is to provide thermal shielding protection for the pump, effectively isolating the pump body from direct thermal shock caused by high-temperature and high-pressure fluids generated in the reactor's high-temperature environment or during accident conditions through its internal circulating cooling water.

[0003] Reference Figure 1 and Figure 2 The sealing structure of the heat shield cavity 2 of a traditional low-pressure safety pump typically achieves static sealing by installing a jacket 11 inside the cavity 2, with an O-ring 12 installed inside the jacket 11. If the O-ring 12 fails due to installation process deviation or material aging, the radioactive medium carried by the pump body 1 will leak into the annular gap of the heat shield cavity 2, causing contamination of the cooling water system and potentially leading to significant safety issues. Utility Model Content

[0004] To address the problem of radioactive media flowing into the heat shield cavity due to seal failure, this application provides a heat shield cavity structure for a low-pressure safety injection pump in a nuclear power plant.

[0005] This application provides a heat shield cavity structure for a low-pressure safety injection pump in a nuclear power plant, which adopts the following technical solution:

[0006] A heat shield cavity structure for a low-pressure safety injection pump in a nuclear power plant includes two heat shield cavities opened on the outer walls at both ends of the pump body and two heat shield pressure plates disposed at both ends of the pump body. The outer openings of the heat shield cavities are provided, and the heat shield pressure plates are fixedly disposed on the pump body and seal the openings of the heat shield cavities.

[0007] By adopting the above technical solution, the heat shield cavity is opened on the outer wall of the pump body, achieving separation from the internal medium of the pump body. The heat shield pressure plate seals the heat shield cavity, preventing leakage of cooling water inside the heat shield cavity. This design isolates the cooling water medium inside the heat shield cavity from the radiant medium of the pump body, thus avoiding the risk of contaminating the cooling water supply system due to contact between the media.

[0008] Preferably, the bottom of the heat shield pressure plate is provided with a drainage hole, which is connected to the heat shield cavity, and a sealing pressure plate is detachably provided on the side wall of the heat shield pressure plate, which seals the drainage hole.

[0009] By adopting the above technical solution, when repairing the pump body, the sealing pressure plate can be removed and the cooling water can be discharged from the heat shield cavity through the drain hole, which facilitates the repair of the pump body.

[0010] Preferably, a sealing ring is embedded on the side wall of the sealing plate near the heat shield plate, and the sealing ring abuts against the heat shield plate.

[0011] By adopting the above technical solution, the sealing ring seals the connection between the sealing plate and the heat shield plate, making it difficult for cooling water to leak from the drain hole.

[0012] Preferably, the sealing plate is rotatably provided with a plurality of bolts, and the threads of the plurality of bolts are disposed within the heat shield plate.

[0013] By adopting the above technical solution, bolts are used to install the sealing pressure plate, which facilitates the installation and disassembly of the sealing pressure plate.

[0014] Preferably, the sealing plate has a pressure groove on its side wall near the heat shield plate and on the outer periphery of the sealing ring, and multiple bolts pass through the pressure groove.

[0015] By adopting the above technical solution, when the sealing plate is installed with bolts, the groove on the outer periphery of the sealing plate allows the bolts to press the middle part of the sealing plate against the heat shield plate, thereby improving the sealing effect of the sealing ring.

[0016] Preferably, the heat shield plate is welded and fixed to the pump body.

[0017] By adopting the above technical solution, the heat shield pressure plate is welded to the pump body, which makes the heat shield pressure plate have a better sealing effect on the heat shield cavity and makes it less likely for cooling water to leak from the heat shield cavity.

[0018] Preferably, the pump body has an inlet and an outlet that communicate with the heat shield cavity, with the inlet located below the outlet.

[0019] By adopting the above technical solution, the coolant first enters the heat shield cavity through the inlet and then flows out of the heat shield cavity through the outlet, thus achieving circulating cooling.

[0020] In summary, this application includes at least one of the following beneficial technical effects:

[0021] 1. By creating a heat shield cavity on the outer wall of the pump body, separation from the internal pump medium is achieved. The heat shield pressure plate seals the heat shield cavity, preventing leakage of cooling water within it. This design isolates the cooling water medium inside the heat shield cavity from the radiant medium in the pump body, thus avoiding the risk of contaminating the cooling water supply system due to contact between the media.

[0022] 2. With the help of the drain hole and sealing plate, when maintaining the pump body, the sealing plate can be removed and the cooling water can be discharged from the heat shield cavity through the drain hole, which facilitates the maintenance of the pump body;

[0023] 3. The sealing ring seals the connection between the sealing plate and the heat shield plate, making it difficult for cooling water to leak from the drain hole. Attached Figure Description

[0024] Figure 1 This is a cross-sectional view of the pump body in the background art of this application;

[0025] Figure 2 For this application Figure 1 Enlarged view of point A in the middle;

[0026] Figure 3 This is a cross-sectional view of the heat shield cavity structure used in the low-pressure safety injection pump of a nuclear power plant in this application;

[0027] Figure 4 For this application Figure 3 Enlarged view of point B in the middle;

[0028] Figure 5 For this application Figure 3 Enlarged view of point C in the middle;

[0029] Figure 6 For this application Figure 4 Enlarged diagram of point D in the middle.

[0030] Reference numerals: 1. Pump body; 2. Heat shield cavity; 3. Heat shield pressure plate; 4. Drain hole; 5. Sealing pressure plate; 6. Sealing ring; 7. Bolt; 8. Pressure groove; 9. Inlet; 10. Outlet; 11. Jacket; 12. O-ring. Detailed Implementation

[0031] The following is in conjunction with the appendix Figures 3-6 This application will be described in further detail.

[0032] This application discloses a heat shield cavity structure for a low-pressure safety injection pump in a nuclear power plant.

[0033] Reference Figure 3 , Figure 4 and Figure 5 A heat shield cavity structure for a low-pressure safety injection pump in a nuclear power plant includes heat shield cavities 2 opened on the driving side and non-driving side of the pump body 1. Both heat shield cavities 2 are annular and are opened on the outer wall of the pump body 1. The heat shield cavities 2 are not connected to the inner cavity of the pump body 1.

[0034] The pump body 1 is welded and fixed to the opening sides of the two heat shield cavities 2 with heat shield pressure plates 3. Both heat shield pressure plates 3 are annular, and the two heat shield pressure plates cover the two heat shield cavities 2 and seal them. Each end of the pump body 1 has an inlet 9 and an outlet 10 that communicate with the heat shield cavity 2. The inlet 9 and the outlet 10 are located at -45° and 45° angles on the horizontal line, respectively, and the inlet 9 is located below the outlet 10.

[0035] The cooling circulation equipment is connected to the inlet 9 and the outlet 10 through pipelines. The cooling circulation equipment injects cooling water into the heat shield cavity 2 from the inlet 9. The cooling water flows upward in the heat shield cavity 2 and effectively insulates the heat. The cooled water that has absorbed heat flows back to the cooling circulation equipment from the outlet 10.

[0036] The heat shield cavity 2 is located on the outer wall of the pump body 1, which separates it from the internal medium of the pump body 1. The cooling water medium in the heat shield cavity 2 is isolated from the radiant medium of the pump body 1, thereby avoiding the risk of contaminating the cooling water supply system due to contact between the media.

[0037] Reference Figure 4 , Figure 5 and Figure 6 The bottom of the heat shield pressure plate 3 has a drain hole 4 along its own axial direction, which connects to the heat shield cavity 2. A sealing pressure plate 5 is detachably fixed to the bottom side wall of the heat shield pressure plate 3 away from the heat shield cavity 2 by multiple bolts 7. The sealing pressure plate 5 is circular, and the bolts 7 are evenly spaced along its circumference. The sealing pressure plate 5 seals the drain hole 4. When maintaining the pump body 1, the sealing pressure plate 5 is removed, and the cooling water in the heat shield cavity 2 can be drained through the drain hole 4, thus facilitating maintenance of the pump body 1.

[0038] A sealing ring 6 is fixedly embedded on the side wall of the sealing plate 5 near the heat shield plate 3, and the sealing cover is located on the outer periphery of the drain hole 4. When the sealing plate 5 is installed on the heat shield plate 3, the sealing plate 5 presses the sealing ring 6 tightly onto the heat shield plate 3, thereby sealing the drain hole 4 and preventing cooling water leakage.

[0039] A groove 8 is formed on the side wall of the sealing plate 5 near the heat shield plate 3. The groove 8 is annular and located on the outer periphery of the sealing ring 6, with multiple bolts 7 passing through it. When the bolts 7 are rotated to fix the sealing plate 5 to the heat shield plate 3, the groove 8 provides space for the bolts 7 to lock the sealing plate 5, making the sealing plate 5 more firmly fixed on the heat shield plate 3, thereby further improving the sealing effect of the sealing ring 6.

[0040] The implementation principle of a heat shield cavity structure for a low-pressure safety injection pump in a nuclear power plant, as described in this application, is as follows: A cooling circulation device is connected to an inlet 9 and an outlet 10 via pipelines. The cooling circulation device injects cooling water into the heat shield cavity 2 from the inlet 9. The cooling water flows upward within the heat shield cavity 2, effectively insulating against heat. After absorbing heat, the cooling water flows back to the cooling circulation device from the outlet 10. The heat shield cavity 2 is located on the outer wall of the pump body 1, achieving separation from the internal medium of the pump body 1. The cooling water medium within the heat shield cavity 2 is isolated from the radiant medium of the pump body 1, thereby avoiding the risk of contaminating the cooling water supply system due to contact between the media.

[0041] The above are merely optional embodiments of this disclosure and are not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A heat shield cavity structure for a low-pressure safety injection pump in a nuclear power plant, characterized in that: It includes two heat shield cavities (2) opened on the outer walls of both ends of the pump body (1) and two heat shield pressure plates (3) set at both ends of the pump body (1). The outer opening of the heat shield cavity (2) is provided, and the heat shield pressure plate (3) is fixedly set on the pump body (1) and seals the opening end of the heat shield cavity (2).

2. The heat shield cavity structure for a low-pressure safety injection pump in a nuclear power plant according to claim 1, characterized in that: The bottom of the heat shield pressure plate (3) is provided with a drain hole (4), which is connected to the heat shield cavity (2). A sealing pressure plate (5) is detachably provided on the side wall of the heat shield pressure plate (3), which is sealed on the drain hole (4).

3. The heat shield cavity structure for a low-pressure safety injection pump in a nuclear power plant according to claim 2, characterized in that: A sealing ring (6) is embedded on the side wall of the sealing plate (5) near the heat shield plate (3), and the sealing ring (6) abuts against the heat shield plate (3).

4. The heat shield cavity structure for a low-pressure safety injection pump in a nuclear power plant according to claim 3, characterized in that: Multiple bolts (7) are rotatably mounted on the sealing pressure plate (5), and the threads of the multiple bolts (7) are set inside the heat shield pressure plate (3).

5. The heat shield cavity structure for a low-pressure safety injection pump in a nuclear power plant according to claim 4, characterized in that: The sealing plate (5) has a pressure groove (8) on the side wall near the heat shield plate (3) and on the outer periphery of the sealing ring (6), and multiple bolts (7) pass through the pressure groove (8).

6. The heat shield cavity structure for a low-pressure safety injection pump in a nuclear power plant according to claim 1, characterized in that: The heat shield plate (3) is welded and fixed to the pump body (1).

7. The heat shield cavity structure for a low-pressure safety injection pump in a nuclear power plant according to claim 1, characterized in that: The pump body (1) has an inlet (9) and an outlet (10) that communicate with the heat shield cavity (2), and the inlet (9) is located below the outlet (10).

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