Nuclear main pump impeller outlet pressure tapping structure for small nuclear power station

Abstract

The invention discloses a nuclear main pump impeller outlet pressure tapping structure for a small nuclear power station, relates to the technical field of small nuclear power station detection devices, and solves the problem that the impeller outlet pressure of a nuclear main pump of the small nuclear power station is difficult to directly measure in the prior art. The whole pressure tapping structure is composed of a pressure tapping assembly, a pressure container wall, a guide vane, an outer cylinder inlet, an inner cylinder outlet, an impeller and the like. Two pressure guiding pipes, namely the inner pressure guiding pipe and the outer pressure guiding pipe, are arranged, so that internal pressure is guided out. The internal pressure guiding pipe is connected through pipe threads with a seal, the external pressure guiding pipe is connected through welding, and the sealing performance is guaranteed. According to the nuclear main pump impeller outlet pressure tapping structure for the small nuclear power station, pressure tapping of an impeller outlet of the small nuclear power station and accurate measurement of pressure of a similar double-layer sleeve structure are guaranteed, meanwhile, welding and pipe thread connection with sealing are adopted, and the integrity of a pressure boundary structure of high-temperature and high-pressure equipment is also guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of small nuclear power plant detection devices, and in particular to a nuclear main pump impeller outlet pressure taking structure for a small nuclear power plant. Background Art

[0002] The International Atomic Energy Agency (IAEA) defines nuclear reactor power plants with an electric power of less than 300 megawatts as "small reactors". Small and medium-sized nuclear reactors and large nuclear power have their own characteristics in technology and application, and complement each other. In order to meet different needs, the IAEA actively encourages the development of safe, reliable, economically feasible and non-proliferation modular small reactors. While developing large nuclear power units, the world's developed nuclear energy countries are also actively developing multi-purpose modular small reactors, including light water reactors, high temperature gas-cooled reactors, liquid metal-cooled fast neutron reactors, molten salt reactors, etc.

[0003] In recent years, many countries with advanced nuclear power technology, including the United States, Russia, Argentina, South Korea, Japan, South Africa, etc., are committed to developing safe and economically competitive small and medium-sized multi-purpose reactors, which are mainly used for power generation, and can also take into account thermal power, hydropower cogeneration and other special purposes. Some small and medium-sized reactors have entered the engineering research stage. In recent years, this type of pump has almost reached the mature stage. Many countries with advanced nuclear power technology are committed to developing safe and economically competitive small and medium-sized multi-purpose reactors.

[0004] At present, the domestic small reactor project has been officially launched. In order to better develop small reactor technology, the technical requirements for nuclear main pumps for small nuclear power plants are becoming higher and higher, and the performance assessment of pumps is becoming more and more perfect. Therefore, in order to more accurately understand the performance of nuclear main pump technology for small nuclear power plants, we need to measure the impeller outlet pressure of the small reactor nuclear main pump. However, since the inlet and outlet of the nuclear main pump for small nuclear power plants is a double-layer casing structure, the impeller outlet is in the inner casing. In order to accurately measure the impeller outlet pressure, it is necessary to drill a hole from the outer wall of the pressure vessel through the inlet fluid and then open the inner casing. There is currently no experience in this structure and application. Summary of the invention

[0005] In view of the problem that the prior art is difficult to directly measure the impeller outlet pressure of the nuclear main pump of a small nuclear power plant, the purpose of the present invention is to provide a nuclear main pump impeller outlet pressure taking structure for a small nuclear power plant, which solves the problem of measuring the impeller outlet pressure of the high-temperature and high-pressure nuclear main pump of a modular integrated small nuclear power plant.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A pressure-taking structure for an impeller outlet of a nuclear main pump for a small nuclear power plant, the pressure-taking structure is used to measure the impeller outlet pressure of a small reactor nuclear main pump, wherein the small reactor nuclear main pump comprises: a pressure vessel wall 2, a guide vane 3 and an impeller 6, the guide vane 3 is installed in the pressure vessel wall 2, an outer cylinder inlet 4 and an inner cylinder outlet 5 are arranged in the pressure vessel wall 2, and a medium flowing in from the outer cylinder inlet 4 passes through the guide vane 3 and is then transported to the inner cylinder outlet 5 through the impeller 6;

[0008] The pressure taking structure includes: a pressure taking component 1, the lower end of the pressure taking component 1 passes through the pressure container wall 2 and extends into the inner tube outlet 5, the pressure measuring device is connected to the upper end of the pressure taking component 1, and the pressure measuring device and the pressure taking component 1 are used to detect the pressure of the medium in the inner tube outlet 5.

[0009] The above-mentioned nuclear main pump impeller outlet pressure taking structure for a small nuclear power plant, wherein the pressure taking assembly 1 includes: a reinforcement pipe 1-1 and an internal pressure-leading pipe 1-2, the internal pressure-leading pipe 1-2 is installed in the reinforcement pipe 1-1, the lower end outer wall of the reinforcement pipe 1-1 is connected to the outer wall of the pressure vessel wall 2, and the lower end of the internal pressure-leading pipe 1-2 passes through the outer wall of the pressure vessel wall 2 and extends into the inner tube outlet 5.

[0010] The above-mentioned nuclear main pump impeller outlet pressure taking structure for a small nuclear power plant, wherein the pressure taking assembly 1 also includes: a locking nut 1-3 and a sealing gland 1-6, the lower end of the sealing gland 1-6 is connected to the upper end of the reinforcement tube 1-1, the locking nut 1-3 is mounted on the sealing gland 1-6 and the lower end inner wall of the locking nut 1-3 is connected to the upper end outer wall of the reinforcement tube 1-1.

[0011] The above-mentioned nuclear main pump impeller outlet pressure taking structure for a small nuclear power plant, wherein the pressure taking assembly 1 also includes: a sealing gasket 1-4, the sealing gasket 1-4 is placed in the locking nut 1-3, and the lower end of the sealing gland 1-6 and the upper end of the reinforcement pipe 1-1 are sealed by the sealing gasket 1-4.

[0012] The above-mentioned nuclear main pump impeller outlet pressure taking structure for small nuclear power plants, wherein the pressure taking assembly 1 also includes: a sealing joint 1-5, and the sealing joint 1-5 is installed at the upper end of the internal pressure-leading pipe 1-2.

[0013] The above-mentioned nuclear main pump impeller outlet pressure taking structure for small nuclear power plants, wherein the pressure taking assembly 1 also includes: a top cover 1-8 and a connecting pipe 1-9, the lower surface of the top cover 1-8 is connected to the upper end of the sealing cover 1-6, the lower end of the connecting pipe 1-9 is connected to the upper surface of the top cover 1-8, and the pressure measuring device is connected to the upper end of the connecting pipe 1-9.

[0014] The above-mentioned nuclear main pump impeller outlet pressure taking structure for a small nuclear power plant, wherein the pressure taking assembly 1 also includes: an external pressure-leading pipe 1-7, the external pressure-leading pipe 1-7 is arranged in a sealing gland 1-6, the upper end of the external pressure-leading pipe 1-7 penetrates into the top cover 1-8 and is connected to the connecting pipe 1-9, and the lower end of the external pressure-leading pipe 1-7 penetrates into the sealing joint 1-5 and is connected to the internal pressure-leading pipe 1-2.

[0015] The above-mentioned nuclear main pump impeller outlet pressure taking structure for small nuclear power plants, wherein the lower end outer wall of the reinforcement pipe 1-1 is welded to the outer wall of the pressure vessel wall 2, and the lower end of the internal pressure-leading pipe 1-2 and the inner cavity wall of the guide vane 3 are threadedly connected.

[0016] In the above-mentioned pressure taking structure at the impeller outlet of the nuclear main pump for a small nuclear power plant, the sealing joint 1-5 is threadedly connected to the upper end of the internal pressure-leading pipe 1-2.

[0017] The above-mentioned nuclear main pump impeller outlet pressure taking structure for a small nuclear power plant, wherein the upper end of the external pressure-leading pipe 1-7 is welded to the top cover 1-8, the lower end of the external pressure-leading pipe 1-7 is welded to the sealing joint 1-5, the lower surface of the top cover 1-8 is welded to the upper end of the sealing gland 1-6, and the lower end of the connecting pipe 1-9 is welded to the upper surface of the top cover 1-8.

[0018] Due to the adoption of the above technology, the present invention has the following positive effects compared with the prior art:

[0019] (1) The present invention solves the problem of accurately measuring the inlet pressure of a high-temperature and high-pressure nuclear main pump with a double-layer sleeve structure, which is difficult to measure directly in the prior art; the pressure-taking structure of the present invention is also easy to implement in terms of operation, has a stable structure, and has been specifically reflected in practical applications;

[0020] (2) The present invention sets up two pressure-guiding pipes, an inner pressure-guiding pipe and an outer pressure-guiding pipe, to ensure the internal pressure is led out. The inner pressure-guiding pipe adopts a sealed pipe thread connection, and the outer pressure-guiding pipe adopts a welding connection to ensure the sealing. The pressure-taking structure of the impeller outlet of the nuclear main pump for a small nuclear power plant guarantees the accurate measurement of the pressure of the impeller outlet of the small nuclear power plant and the pressure of the similar double-layer casing structure. At the same time, the use of welding and sealed pipe thread connection also ensures the integrity of the pressure boundary structure of the high-temperature and high-pressure equipment;

[0021] (3) This structure uses two seals, a sealing gasket and a locking nut with a sealing pipe thread, to prevent leakage of high-temperature and high-pressure radioactive media, thereby ensuring safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The present invention is a structural schematic diagram of a pressure taking structure at an impeller outlet of a nuclear main pump for a small nuclear power plant.

[0023] Figure 2It is a structural schematic diagram of the reinforcement pipe of the present invention.

[0024] Figure 3 It is a structural schematic diagram of the internal pressure-leading tube of the present invention.

[0025] Figure 4 It is a structural schematic diagram of the locking nut of the present invention.

[0026] Figure 5 It is a schematic structural diagram of the sealing gasket of the present invention.

[0027] Figure 6 It is a structural schematic diagram of the sealing joint of the present invention.

[0028] Figure 7 It is a schematic structural diagram of the sealing gland of the present invention.

[0029] Figure 8 It is a structural schematic diagram of the external pressure-leading tube of the present invention.

[0030] Fig. 9 It is a structural schematic diagram of the top cover of the present invention.

[0031] Fig.10 It is a structural schematic diagram of the connecting pipe of the present invention.

[0032] In the attached drawings: 1. pressure taking assembly; 2. pressure vessel wall; 3. guide vane; 4. outer tube inlet; 5. inner tube outlet; 6. impeller; 1-1. reinforcement tube; 1-2. inner pressure tube; 1-3. locking nut; 1-4. sealing gasket; 1-5. sealing joint; 1-6. sealing gland; 1-7. outer pressure tube; 1-8. top cover; 1-9. connecting pipe. DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0034] Please refer to Figures 1 to 10 As shown, a pressure-taking structure for the impeller outlet of a nuclear main pump for a small nuclear power plant is shown, and the pressure-taking structure is used to measure the impeller outlet pressure of the small reactor nuclear main pump, wherein the small reactor nuclear main pump comprises: a pressure vessel wall 2, a guide vane 3 and an impeller 6, wherein the guide vane 3 is installed in the pressure vessel wall 2, and an outer cylinder inlet 4 and an inner cylinder outlet 5 are arranged in the pressure vessel wall 2, and the medium flowing in from the outer cylinder inlet 4 passes through the guide vane 3 and is then transported to the inner cylinder outlet 5 through the impeller 6;

[0035] The pressure taking structure includes: a pressure taking component 1, the lower end of the pressure taking component 1 passes through the pressure container wall 2 and extends into the inner tube outlet 5, the pressure measuring device is connected to the upper end of the pressure taking component 1, and the pressure measuring device and the pressure taking component 1 are used to detect the pressure of the medium in the inner tube outlet 5.

[0036] Furthermore, in a preferred embodiment, the pressure taking assembly 1 includes: a reinforcement tube 1-1 and an internal pressure-leading tube 1-2, the internal pressure-leading tube 1-2 is installed in the reinforcement tube 1-1, the outer wall of the lower end of the reinforcement tube 1-1 is connected to the outer wall of the pressure vessel wall 2, and the lower end of the internal pressure-leading tube 1-2 passes through the outer wall of the pressure vessel wall 2 and extends into the inner tube outlet 5.

[0037] Furthermore, in a preferred embodiment, the pressure taking assembly 1 also includes: a locking nut 1-3 and a sealing cover 1-6, the lower end of the sealing cover 1-6 is connected to the upper end of the reinforcement tube 1-1, the locking nut 1-3 is mounted on the sealing cover 1-6 and the lower end inner wall of the locking nut 1-3 is connected to the upper end outer wall of the reinforcement tube 1-1.

[0038] Furthermore, in a preferred embodiment, the pressure taking assembly 1 also includes: a sealing gasket 1-4, the sealing gasket 1-4 is placed in the locking nut 1-3, and the lower end of the sealing cover 1-6 and the upper end of the reinforcement pipe 1-1 are sealed by the sealing gasket 1-4.

[0039] Furthermore, in a preferred embodiment, the pressure taking assembly 1 also includes: a sealing joint 1-5, and the sealing joint 1-5 is installed at the upper end of the internal pressure-leading pipe 1-2.

[0040] Furthermore, in a preferred embodiment, the pressure taking assembly 1 also includes: a top cover 1-8 and a connecting pipe 1-9, the lower surface of the top cover 1-8 is connected to the upper end of the sealing cover 1-6, the lower end of the connecting pipe 1-9 is connected to the upper surface of the top cover 1-8, and the pressure measuring device is connected to the upper end of the connecting pipe 1-9.

[0041] Furthermore, in a preferred embodiment, the pressure taking assembly 1 also includes: an external pressure-leading pipe 1-7, the external pressure-leading pipe 1-7 is arranged in the sealing pressure cover 1-6, the upper end of the external pressure-leading pipe 1-7 passes through the top cover 1-8 and is connected with the connecting pipe 1-9, and the lower end of the external pressure-leading pipe 1-7 passes through the sealing joint 1-5 and is connected with the internal pressure-leading pipe 1-2.

[0042] Furthermore, in a preferred embodiment, the outer wall of the lower end of the reinforcement pipe 1-1 is welded to the outer wall of the pressure vessel wall 2, and the lower end of the inner pressure-introducing pipe 1-2 is threadedly connected to the inner cavity wall of the guide vane 3.

[0043] Further, in a preferred embodiment, the sealing joint 1-5 and the upper end of the internal pressure-leading tube 1-2 are threadedly connected.

[0044] Furthermore, in a preferred embodiment, the upper end of the external pressure-leading tube 1-7 is welded to the top cover 1-8, the lower end of the external pressure-leading tube 1-7 is welded to the sealing joint 1-5, the lower surface of the top cover 1-8 is welded to the upper end of the sealing pressure cover 1-6, and the lower end of the connecting tube 1-9 is welded to the upper surface of the top cover 1-8.

[0045] The above are only preferred embodiments of the present invention, and are not intended to limit the implementation and protection scope of the present invention.

[0046] The present invention also has the following implementation modes based on the above:

[0047] The present invention discloses a pressure-taking structure for the impeller outlet of a nuclear main pump for a small nuclear power plant, and relates to the technical field of measuring the impeller outlet pressure of a special structure of a nuclear main pump for a small nuclear power plant, and solves the problem of accurately measuring the impeller outlet pressure of a double-layer sleeve structure pump of a nuclear main pump for a small nuclear power plant. In the present invention, the entire pressure-taking structure is composed of a pressure vessel wall 2, a guide vane 3, an outer cylinder inlet 4, an inner cylinder outlet 5, an impeller 6, a reinforcement pipe 1-1, an inner pressure-leading pipe 1-2, a locking nut 1-3, a sealing gasket 1-3, a sealing joint 1-5, a sealing gland 1-6, an outer pressure-leading pipe 1-7, a top cover 1-8, a connecting pipe 1-9, etc. The present invention is provided with two pressure-leading pipes, an inner pressure-leading pipe 1-2 and an outer pressure-leading pipe 1-7, to ensure the internal pressure is led out. The inner pressure-leading pipe 1-2 is connected by a pipe thread with a seal, and the outer pressure-leading pipe 1-7 is connected by welding to ensure the sealing performance. The nuclear main pump impeller outlet pressure taking structure for small nuclear power plants provides a guarantee for the accurate measurement of the impeller outlet pressure taking of small nuclear power plants and the pressure of similar double-layer casing structures. At the same time, the use of welding and sealed pipe thread connections also ensures the integrity of the pressure boundary structure of high-temperature and high-pressure equipment.

[0048] In a further embodiment of the present invention, the purpose of the present invention is to provide a high-temperature and high-pressure pressure-taking structure with a simple structure, stable performance, reliability and safety. The technical solution of the present invention is as follows: the pressure vessel wall 2 is used as the pump casing of the nuclear main pump of the small nuclear power department, the guide vane 3 is in the pressure vessel wall 2, the impeller 6 is in the guide vane 3, and the pressure-taking assembly 1 is welded to the pressure vessel wall 2.

[0049] In a further embodiment of the present invention, the pressure taking assembly 1 is composed of a reinforcement tube 1-1, an internal pressure tube 1-2, a locking nut 1-3, a sealing gasket 1-4, a sealing joint 1-5, a sealing gland 1-6, an external pressure tube 1-7, a top cover 1-8, and a connecting tube 1-9.

[0050] In a further embodiment of the present invention, the internal pressure-introducing pipe 1 - 2 passes through the pressure vessel wall 2 and the inlet medium and is connected to the guide vane 3 through a pipe thread, and the internal pressure-introducing pipe 1 - 2 is connected to the inner cavity of the guide vane 3 .

[0051] In a further embodiment of the present invention, the sealing joint 1-5 and the internal pressure-leading pipe 1-2 are connected by pipe threads, the external pressure-leading pipe 1-7, the sealing joint 1-5 and the top cover 1-8 are connected by welding, and the top cover 1-8, the sealing gland 1-6 and the connecting pipe 1-9 are connected by welding.

[0052] In a further embodiment of the present invention, the working process of the present invention is as follows: Figure 1As shown by the arrow, the medium flows in from the outer cylinder inlet 4 of the guide vane 3, flows into the impeller 6 after being rectified by the guide vane 3, and then flows out through the inner cylinder outlet of the guide vane 3 after the energy is increased. The medium at the outlet of the impeller 6 flows through the inner pressure-introducing pipe 1-2 to the sealing joint 1-5 and then flows through the outer pressure-introducing pipe 1-7 to the connecting pipe 1-9. The external pressure measuring device is connected to the connecting pipe 1-9 to obtain the pressure at the outlet of the impeller 6 in the pump.

[0053] In a further embodiment of the present invention, the pressure taking structure of the impeller outlet of the nuclear main pump for a small nuclear power plant of the present invention is as follows: Figure 1 As shown, the characteristic is that both the inside and the outside of the internal pressure-introducing pipe 1-2 are high pressure, the inlet operating pressure of the nuclear main pump is above 17MPa, and the outlet pressure is even higher.

[0054] In a further embodiment of the present invention, the pressure taking structure of the impeller outlet of the nuclear main pump for a small nuclear power plant of the present invention is as follows: Figure 1 As shown, the characteristic is that the sealing of the high pressure part inside the pressure taking structure 1 is ensured by thread sealing and welding sealing.

[0055] In a further embodiment of the present invention, the pressure taking structure of the impeller outlet of the nuclear main pump for a small nuclear power plant of the present invention is as follows: Figure 1 As shown, the characteristic is that the external pressure-leading pipe is a telescopic structure, and the length can be adjusted according to different space requirements.

[0056] In a further embodiment of the present invention, the pressure taking structure of the impeller outlet of the nuclear main pump for a small nuclear power plant of the present invention is as follows: Figure 1 As shown, the characteristic is that the sealing gaskets 1-4 are spiral wound gaskets resistant to high temperature and high pressure.

[0057] In a further embodiment of the present invention, the specific implementation method is as follows: Figure 1 As shown, the pressure taking structure of the impeller outlet of the nuclear main pump for a small nuclear power plant of the present invention is as follows: first, the reinforcing pipe is welded to the pressure vessel wall 2, and then the reinforcing pipe 1-1 is punched through to the inner cylinder of the guide vane 3, and then the inner cylinder of the guide vane 3 is threaded according to the size, and then the inner pressure-introducing pipe 1-2 is passed through the reinforcing pipe 1-1 and the pressure vessel wall 2 and screwed to the inner cylinder of the guide vane 3, and then the sealing joint 1-5 is screwed to the inner pressure-introducing pipe 1-2 and the lower end of the outer pressure-introducing pipe 1-7 is welded to the sealing joint 1 -5, then put the sealing gasket 1-4 on the reinforcing pipe 1-1, then pass the sealing gland 1-6 through the external pressure-leading pipe 1-7 and press it on the sealing gasket 1-4, then put the clamping nut 1-3 on the outside of the sealing gland 1-6 and tighten it to the reinforcing pipe 1-1, then weld the top cover 1-8 to the sealing gland 1-6 through the external pressure-leading pipe 1-7, then weld the external pressure-leading pipe 1-7 and the top cover 1-8 together, and then weld the connecting pipe 1-9 to the top cover 1-8.

[0058] In a further embodiment of the present invention, the present invention relates to a pressure taking structure for the impeller outlet of a nuclear main pump for a small nuclear power plant. The pressure taking assembly 1 is composed of a reinforcing pipe 1-1, an inner pressure-introducing pipe 1-2, a locking nut 1-3, a sealing gasket 1-4, a sealing joint 1-5, a sealing gland 1-6, an outer pressure-introducing pipe 1-7, a top cover 1-8, and a connecting pipe 1-9, which is welded on the pressure vessel wall 2 of a small pile, passes through the pressure vessel wall 2 of the small pile and the inlet medium, and then passes through the inner cylinder of the guide vane 3 to obtain the high-pressure medium at the impeller outlet 5. The problem of measuring the impeller outlet pressure of the high-temperature and high-pressure nuclear main pump of a modular integrated small nuclear power plant is solved.

[0059] In a further embodiment of the present invention, a pressure taking structure is welded to the outer wall of the pressure vessel wall 2 of a small nuclear main pump, a pressure measuring device is installed on the pressure taking structure, the pressure taking structure extends into the inner tube outlet 5, the pressure of the medium in the inner tube outlet 5 is taken, and the pressure in the inner tube outlet 5 is detected by the pressure measuring device located on the pressure taking structure.

[0060] In a further embodiment of the present invention, Figure 1 As shown, the inner pressure-leading pipe 1-2 extends into the small reactor core main pump and is connected to the guide vane 3 by threads, the reinforcement pipe 1-1 is welded to the outer wall of the pressure vessel wall 2, the inner pressure-leading pipe 1-2 is installed with a limiter, the sealing joint 1-5 and the upper end of the inner pressure-leading pipe 1-2 are connected by pipe threads, which ensures the strength and stability of the connection between the sealing joint 1-5 and the inner pressure-leading pipe 1-2, and is convenient for disassembly, maintenance and replacement, the lower end of the outer pressure-leading pipe 1-7 is connected to the sealing joint 1-5 and is welded, the upper end of the outer pressure-leading pipe 1-7 is connected to the top cover 1-8 and is welded, the lower end of the connecting pipe 1-9 is connected to the connecting pipe 1-9 and is welded, and the pressure measuring device measures the pressure of the liquid medium in the connecting pipe 1-9.

[0061] In a further embodiment of the present invention, Figure 1 As shown, the sealing gland 1-6 is arranged above the reinforcement pipe 1-1 and the sealing gland 1-6 and the reinforcement pipe 1-1 are connected and fixed by the locking nut 1-3. The sealing gland 1-6 and the reinforcement pipe 1-1 are sealed by the sealing gasket 1-4, and the connection between the sealing joint 1-5 and the reinforcement pipe 1-1 is sealed twice.

[0062] In a further embodiment of the present invention, the locking nut 1-3 and the reinforcing pipe 1-1 are connected by threads, which facilitates the disassembly, maintenance and replacement of the locking nut 1-3, the sealing gasket 1-4 and the sealing joint 1-5.

[0063] The above are only preferred embodiments of the present invention, and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A pressure-taking structure for the impeller outlet of a nuclear main pump for a small nuclear power plant, the pressure-taking structure is used to measure the impeller outlet pressure of a small reactor nuclear main pump, characterized in that: The small-sized nuclear reactor main pump comprises: a pressure vessel wall (2), a guide vane (3) and an impeller (6), wherein the guide vane (3) is installed in the pressure vessel wall (2), an outer cylinder inlet (4) and an inner cylinder outlet (5) are arranged in the pressure vessel wall (2), and a medium flowing in from the outer cylinder inlet (4) passes through the guide vane (3) and is then transported to the inner cylinder outlet (5) through the impeller (6); The pressure taking structure comprises: a pressure taking component (1), the lower end of the pressure taking component (1) passes through the pressure container wall (2) and extends into the inner tube outlet (5), a pressure measuring device is connected to the upper end of the pressure taking component (1), and the pressure measuring device and the pressure taking component (1) are used to detect the pressure of the medium in the inner tube outlet (5).

2. The pressure taking structure at the impeller outlet of the nuclear main pump for a small nuclear power plant according to claim 1, characterized in that: The pressure taking assembly (1) comprises: a reinforcing pipe (1-1) and an inner pressure-introducing pipe (1-2); the inner pressure-introducing pipe (1-2) is installed in the reinforcing pipe (1-1); the outer wall of the lower end of the reinforcing pipe (1-1) is connected to the outer wall of the pressure vessel wall (2); the lower end of the inner pressure-introducing pipe (1-2) passes through the outer wall of the pressure vessel wall (2) and extends into the inner tube outlet (5).

3. The pressure taking structure at the impeller outlet of the nuclear main pump for a small nuclear power plant according to claim 2, characterized in that: The pressure taking assembly (1) further comprises: a locking nut (1-3) and a sealing gland (1-6); the lower end of the sealing gland (1-6) is connected to the upper end of the reinforcing tube (1-1); the locking nut (1-3) is mounted on the sealing gland (1-6) and the inner wall of the lower end of the locking nut (1-3) is connected to the outer wall of the upper end of the reinforcing tube (1-1).

4. The pressure taking structure at the impeller outlet of the nuclear main pump for a small nuclear power plant according to claim 3 is characterized in that: The pressure taking assembly (1) further comprises: a sealing gasket (1-4), the sealing gasket (1-4) being placed in the locking nut (1-3), and the lower end of the sealing gland (1-6) and the upper end of the reinforcing tube (1-1) being sealed by the sealing gasket (1-4).

5. The pressure taking structure at the impeller outlet of the nuclear main pump for a small nuclear power plant according to claim 3 is characterized in that: The pressure taking assembly (1) further comprises: a sealing joint (1-5), wherein the sealing joint (1-5) is installed at the upper end of the internal pressure leading pipe (1-2).

6. The pressure taking structure at the impeller outlet of the nuclear main pump for a small nuclear power plant according to claim 5, characterized in that: The pressure taking assembly (1) further comprises: a top cover (1-8) and a connecting pipe (1-9); the lower surface of the top cover (1-8) is connected to the upper end of the sealing gland (1-6); the lower end of the connecting pipe (1-9) is connected to the upper surface of the top cover (1-8); and the pressure measuring device is connected to the upper end of the connecting pipe (1-9).

7. The pressure taking structure at the impeller outlet of the nuclear main pump for a small nuclear power plant according to claim 6, characterized in that: The pressure taking assembly (1) also includes: an external pressure-leading pipe (1-7), wherein the external pressure-leading pipe (1-7) is arranged in the sealing gland (1-6), the upper end of the external pressure-leading pipe (1-7) penetrates into the top cover (1-8) and is connected to the connecting pipe (1-9), and the lower end of the external pressure-leading pipe (1-7) penetrates into the sealing joint (1-5) and is connected to the internal pressure-leading pipe (1-2).

8. The pressure taking structure at the impeller outlet of the nuclear main pump for a small nuclear power plant according to claim 2, characterized in that: The outer wall of the lower end of the reinforcing pipe (1-1) is connected to the outer wall of the pressure vessel wall (2) by welding, and the lower end of the inner pressure-introducing pipe (1-2) and the inner cavity wall of the guide vane (3) are connected by threads.

9. The pressure taking structure at the impeller outlet of the nuclear main pump for a small nuclear power plant according to claim 5, characterized in that: The sealing joint (1-5) and the upper end of the internal pressure-leading pipe (1-2) are threadedly connected.

10. The impeller outlet pressure taking structure for a nuclear main pump for a small nuclear power plant according to claim 7, characterized in that: The upper end of the external pressure-leading pipe (1-7) is welded to the top cover (1-8), the lower end of the external pressure-leading pipe (1-7) is welded to the sealing joint (1-5), the lower surface of the top cover (1-8) is welded to the upper end of the sealing gland (1-6), and the lower end of the connecting pipe (1-9) is welded to the upper surface of the top cover (1-8).

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