Core dummy and pressure-inducing device

Abstract

The present invention proposes a core simulation body and a pressure-inducing device. The core simulation body of the present invention includes: a pressure vessel, the side wall of the pressure vessel has a plurality of first through holes passing through it; an inner cylinder, the inner cylinder is arranged in the pressure vessel, the side wall of the inner cylinder is spaced apart from the side wall inside the pressure vessel, and the side wall of the inner cylinder has a plurality of second through holes passing through it; a plurality of pressure-inducing devices, each pressure-inducing device includes a connecting piece, a positioning tube and a pressure-inducing tube, the connecting piece is located in the pressure vessel and is arranged on the outer wall of the inner cylinder, a plurality of connecting pieces are arranged one by one around the outer circumference of the second through hole, the positioning tube and the pressure-inducing tube both extend in the first direction, the inlet of the pressure-inducing tube passes through the positioning tube and extends into the connecting piece, the inlet of the pressure-inducing tube is connected to the second through hole so that the gas-liquid two-phase mixture in the cylinder can pass into the pressure-inducing tube through the second through hole. The pressure-inducing device of the core simulation body according to the present invention has the advantages of convenient pressure measurement and high measurement accuracy.

Description

Technical Field

[0001] The present invention relates to the field of nuclear power technology, and in particular to a core simulation body and a pressure-inducing device. Background Art

[0002] A large break accident is a design basis accident for nuclear power plants and one of the key accidents that nuclear power plant safety analysis software must analyze. When a large break occurs, the core fluid rapidly transitions to a two-phase state due to factors such as reduced coolant flow, reduced flow velocity, and system pressure drop. Analyzing and studying the two-phase flow and heat transfer phenomena in typical pressurized water reactor cores, and accurately measuring relevant parameters, are key to obtaining data to support the validation and promotion of domestic nuclear power design safety analysis software. Core simulators are tools used for nuclear reactor physics and thermal-hydraulic analysis, primarily simulating various physical processes within the nuclear reactor core. Core simulators are high-temperature, high-pressure pressure vessels with an annular cavity. When measuring the void fraction of two-phase flow in non-annular locations within the pressure vessel and with complex internal components, differential pressure measurement is the primary method used in related technologies. Key to accurate measurement is how to successfully measure pressure within the high-pressure vessel internals, ensuring no internal or external leaks, and minimizing pressure drop in the impulse lines and measurement errors caused by cavitation accumulation within them. Summary of the Invention

[0003] The present invention aims to solve one of the technical problems in the related art to at least a certain extent. To this end, an embodiment of the present invention provides a reactor core dummy and a pressure-inducing device.

[0004] The core simulation body of the embodiment of the present invention includes:

[0005] A pressure vessel, wherein a side wall of the pressure vessel has a plurality of first through holes extending therethrough, wherein the plurality of first through holes are spaced apart in a vertical direction;

[0006] an inner cylinder, the inner cylinder being disposed within the pressure vessel, the sidewall of the inner cylinder being spaced apart from the sidewall of the pressure vessel, the sidewall of the inner cylinder having a plurality of second through holes extending therethrough, the plurality of second through holes being spaced apart in the vertical direction, and the plurality of second through holes corresponding one-to-one to the plurality of first through holes in the first direction;

[0007] Multiple pressure-inducing devices, each of the pressure-inducing devices includes a connecting piece, a positioning tube and a pressure-inducing tube, the connecting piece is located in the pressure vessel and is arranged on the outer wall of the inner cylinder, the multiple connecting pieces are arranged one-to-one on the outer peripheral side of the second through hole, the multiple positioning tubes are arranged on the outer wall of the pressure vessel, and the multiple positioning tubes are arranged one-to-one on the outer peripheral side of the first through hole, the positioning tube and the pressure-inducing tube both extend along the first direction, the inlet of the pressure-inducing tube passes through the positioning tube and extends into the connecting piece, and the inlet of the pressure-inducing tube is connected to the second through hole so that the gas-liquid two-phase mixture in the cylinder can pass into the pressure-inducing tube through the second through hole.

[0008] Therefore, the pressure-inducing device for the core dummy according to the embodiment of the present invention has the advantages of convenient pressure measurement and high measurement accuracy.

[0009] In some embodiments, the core simulation body includes a detection unit, and the detection unit includes a differential pressure transmitter. Each of the differential pressure transmitters is used to measure the pressure difference of the liquid discharged from two adjacent pressure-inducing pipes in the upper and lower directions.

[0010] In some embodiments, there are multiple detection units, each of which includes one differential pressure transmitter and two gas-water separators. Each gas-water separator has a two-phase flow inlet, a gas outlet and a liquid single-phase outlet. The gas outlet, the two-phase flow inlet and the liquid single-phase outlet are arranged in sequence from top to bottom. The two pressure measuring ports of each differential pressure transmitter are respectively connected to the liquid single-phase outlets of the two gas-water separators through pipelines, and the two gas-water separators of each detection unit are respectively connected to the outlets of two adjacent pressure pipes in the upper and lower directions.

[0011] In some embodiments, the gas-water separator includes an upper top plate, an annular body and a lower bottom plate connected in sequence from top to bottom, the gas-water separator is made of metal material, the annular body extends in the up and down directions, the two-phase flow inlet is opened at the lower part of the annular body, the upper top plate covers the upper opening of the annular body, the gas outlet is opened on the upper top plate, at least part of the gas outlet is a conical hole with an inner diameter increasing from top to bottom, the lower bottom plate covers the lower opening of the annular body, and the liquid single-phase outlet is opened on the lower bottom plate.

[0012] In some embodiments, a thread is provided on the inner side of the connecting piece, and the pressure-inducing tube is threadedly connected to the connecting piece.

[0013] In some embodiments, a sealing member is provided on the pressure-inducing tube for sealing the gap between the positioning tube and the pressure-inducing tube.

[0014] In some embodiments, a sealing platform is provided on the outer peripheral side of the end of the positioning tube away from the pressure vessel, and the sealing member includes a sealing ring and a sealing gasket, which are sleeved on the pressure-inducing tube, and the sealing gasket is located between the sealing platform and the sealing ring, and the sealing ring is threadedly connected to the sealing platform.

[0015] In some embodiments, the connecting piece is welded to the outer wall of the inner cylinder;

[0016] The positioning tube is welded to the outer side wall of the pressure vessel;

[0017] The pressure-resistant strength of the pressure-inducing pipe is greater than or equal to 8 MPa.

[0018] In some embodiments, the diameter of the second through hole is greater than or equal to 0.5 mm and less than or equal to 1.5 mm;

[0019] A stepped hole is provided at the inlet of the pressure-inducing tube. The diameter of at least part of the stepped hole decreases in the first direction along a direction adjacent to the second through hole. The diameter of the stepped hole is greater than or equal to the diameter of the second through hole.

[0020] The present invention also proposes a pressure-guiding device, including a connecting piece, a positioning tube and a pressure-guiding tube, wherein the connecting piece is used to be arranged on the outer wall of the inner cylinder in the pressure vessel, the connecting piece is used to be arranged in a ring on the outer peripheral side of the second through hole of the inner cylinder, the positioning tube is arranged on the outer wall of the pressure vessel, the positioning tube is arranged in a ring on the outer peripheral side of the first through hole of the pressure vessel, the positioning tube and the pressure-guiding tube both extend in a first direction, the inlet of the pressure-guiding tube passes through the positioning tube and extends into the connecting piece, the inlet of the pressure-guiding tube is connected with the second through hole so that the gas-liquid two-phase mixture in the inner cylinder can pass through the second through hole into the pressure-guiding tube, a sealing platform is provided on the outer peripheral side of the positioning tube away from the pressure vessel, a sealing ring and a sealing gasket are provided on the outer peripheral side of the pressure-guiding tube, the sealing gasket is located between the sealing platform and the sealing ring, and the sealing ring is threadedly connected to the sealing platform. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of a core simulation body according to an embodiment of the present invention.

[0022] Figure 2 2 is a schematic diagram of a pressure-inducing device according to an embodiment of the present invention.

[0023] Figure 3 Schematic diagram of a gas-water separator according to an embodiment of the present invention.

[0024] Reference numerals:

[0025] 1. pressure vessel, 11. first through hole;

[0026] 2. Inner cylinder, 21. Second through hole;

[0027] 31. Connecting piece, 32. Positioning tube, 33. Pressure tube, 34. Sealing platform, 35. Sealing ring;

[0028] 4. Differential pressure transmitter, 41. Gas-water separator, 42. Upper top plate, 43. Ring body, 44. Lower bottom plate, 45. Two-phase flow inlet, 46. Gas outlet, 47. Liquid single-phase outlet. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0030] The following describes the core simulation of an embodiment of the present invention with reference to the accompanying drawings. Figures 1 to 3 As shown, the core simulation body according to an embodiment of the present invention includes a pressure vessel 1, an inner cylinder 2 and a plurality of pressure-inducing devices.

[0031] The side wall of the pressure vessel 1 has a plurality of first through holes 11 therethrough, and the plurality of first through holes 11 are spaced apart in the vertical direction. Specifically, the pressure vessel 1 is used to bear pressure and is the shell of the core simulation body.

[0032] The inner cylinder 2 is disposed within the pressure vessel 1. The sidewall of the inner cylinder 2 is spaced apart from the sidewall of the pressure vessel 1. The sidewall of the inner cylinder 2 has a plurality of second through holes 21 extending therethrough. The plurality of second through holes 21 are spaced apart in the vertical direction, and the plurality of second through holes 21 correspond one-to-one with the plurality of first through holes 11 in the first direction. Specifically, the sidewall of the pressure vessel 1 is disposed around the circumference of the inner cylinder 2 and spaced apart from the inner cylinder 2. The inner cylinder 2 is provided with fuel rods and other devices, and the inner cylinder 2 contains a gas-liquid two-phase fluid. The first direction can be a left-right direction. For example, the plurality of second through holes 21 correspond one-to-one with the plurality of first through holes 11 in the left-right direction.

[0033] The diameter of the second through hole 21 is greater than or equal to 0.5 mm and less than or equal to 1.5 mm. For example, the diameter of the second through hole 21 is 1 mm.

[0034] Each pressure-inducing device includes a connecting piece 31 , a positioning tube 32 and a pressure-inducing tube 33 .

[0035] like Figure 1 and Figure 2As shown, the connector 31 is located within the pressure vessel 1 and is provided on the outer wall of the inner cylinder 2. Multiple connectors 31 are arranged one-to-one around the outer periphery of the second through hole 21. Specifically, the connector 31 is an annular structure, welded to the outer wall of the inner cylinder 2, and has a through hole extending in a first direction. The through hole of each connector 31 is threaded. The through hole of each connector 31 is located around the corresponding second through hole 21.

[0036] Multiple positioning tubes 32 are disposed on the outer wall of the pressure vessel 1, one-to-one and arranged around the outer periphery of the first through-hole 11. The positioning tubes 32 are welded to the outer wall of the pressure vessel 1 so that there is no gap between them. Both the positioning tubes 32 and the pressure-inducing tube 33 extend in a first direction. The inner diameter of the positioning tubes 32 matches the outer diameter of the pressure-inducing tube 33. The positioning tubes 32 are used to position the pressure-inducing tube 33. For example, both the positioning tubes 32 and the pressure-inducing tube 33 extend in the left-right direction.

[0037] The inlet of the pressure-inducing tube 33 passes through the positioning tube 32 and extends into the connector 31. The inlet of the pressure-inducing tube 33 is connected to the second through hole 21 so that the gas-liquid two-phase mixture in the cylinder can pass into the pressure-inducing tube 33 through the second through hole 21. Specifically, the inner side of the connector 31 is provided with threads, and the pressure-inducing tube 33 is threadedly connected to the connector 31. The inlet of the pressure-inducing tube 33 passes through the positioning tube 32 and extends into the connector 31. The pressure-inducing tube 33 is rotated so that the pressure-inducing tube 33 and the connector 31 are threadedly connected, thereby allowing the second through hole 21 to communicate with the pressure-inducing tube 33. In this way, the pressure or pressure difference at different heights can be measured using the fluid discharged from the pressure-inducing tube 33. For example, the gap between the pressure-inducing tube 33 and the connector 31 is coated with a sealing material to further enhance the sealing performance.

[0038] like Figure 1 and Figure 2 As shown, in some embodiments, the pressure-inducing tube 33 is provided with a seal for sealing the gap between the positioning tube 32 and the pressure-inducing tube 33. Specifically, a sealing platform 34 is provided on the outer circumference of the end of the positioning tube 32 away from the pressure vessel 1. The seal includes a sealing ring 35 and a sealing gasket. The sealing ring 35 and the sealing gasket are sleeved on the pressure-inducing tube 33, with the sealing gasket positioned between the sealing platform 34 and the sealing ring 35. The sealing ring 35 is threadedly connected to the sealing platform 34. As a result, after the sealing ring 35 is connected to the sealing platform 34, the sealing gasket can block the gap between the positioning tube 32 and the pressure-inducing tube 33. For example, the sealing ring 35 has an internal thread, and the sealing platform 34 has an external thread. A portion of the sealing platform 34 can enter the sealing ring 34. After the sealing ring 34 is rotated, the sealing ring 34 can be threadedly connected to the sealing platform 34.

[0039] In some embodiments, the pressure-resistant strength of the pressure-inducing tube 33 is greater than or equal to 8 MPa, so that the pressure-inducing tube 33 can withstand pressure.

[0040] In some embodiments, a stepped hole is provided at the inlet of the pressure-inducing tube 33 , and the diameter of at least part of the stepped hole decreases in the first direction along the direction adjacent to the second through hole 21 , and the diameter of the stepped hole is greater than or equal to the diameter of the second through hole 21 .

[0041] like Figures 1 to 3 As shown, in some embodiments, the core dummy includes a detection unit, which includes a differential pressure transmitter 4. Each differential pressure transmitter 4 is used to measure the pressure difference of liquid discharged from two adjacent pressure impulse pipes 33 in the vertical direction. Therefore, multiple differential pressure transmitters 4 can be used to monitor the pressure difference of liquid discharged from multiple adjacent pressure impulse pipes 33 in the vertical direction.

[0042] In some embodiments, there are multiple detection units, and each detection unit includes a differential pressure transmitter 4 and two gas-water separators 41 .

[0043] Each gas-water separator 41 has a two-phase flow inlet 45, a gas outlet 46, and a liquid single-phase outlet 47. The gas outlet 46, two-phase flow inlet 45, and liquid single-phase outlet 47 are arranged in sequence from top to bottom. The two pressure measuring ports (pressure measuring points) of each differential pressure transmitter 4 are respectively connected to the liquid single-phase outlets 47 of the two gas-water separators 41 through pipes. The two gas-water separators 41 of each detection unit are respectively connected to the outlets of two adjacent pressure-inducing pipes 33 in the vertical direction. Thus, after the gas-liquid two-phase mixture discharged from the pressure-inducing pipe 33 enters the gas-water separator 41 through the two-phase flow inlet 45, the gas in the gas-water separator 41 is discharged from the gas outlet 46, and the liquid in the gas-water separator 41 is discharged from the liquid single-phase outlet 47. The two pressure measuring ports (pressure measuring points) of the differential pressure transmitter 4 respectively measure the liquid pressure at the liquid single-phase outlet 47 of the gas-water separator 41 through pipes to measure the pressure difference.

[0044] like Figure 3 As shown, the gas-water separator 41 includes an upper top plate 42, an annular main body 43 and a lower bottom plate 44 which are connected in sequence from top to bottom.

[0045] The gas-water separator 41 (upper top plate 42, annular body 43, and lower bottom plate 44) is made of metal, and the annular body 43 extends in the vertical direction. A two-phase flow inlet 45 is provided at the lower portion of the annular body 43. The upper top plate 42 covers the upper opening of the annular body 43. A gas outlet 46 is provided on the upper top plate 42. At least a portion of the gas outlet 46 is a tapered hole with an increasing inner diameter from top to bottom. The lower bottom plate 44 covers the lower opening of the annular body 43. A liquid single-phase outlet 47 is provided on the lower bottom plate 44. For example, the gas-water separator 41 is made of steel, and the annular body 43 is a circular ring. The gas outlet 46 extends through the upper top plate 42 in the vertical direction, and the liquid single-phase outlet 47 extends through the lower bottom plate 44 in the vertical direction.

[0046] The present invention further provides a pressure-inducing device, which is a pressure-inducing device on a core dummy according to an embodiment of the present invention. Specifically, the pressure-inducing device on the core dummy according to an embodiment of the present invention includes a connector 31 , a positioning tube 32 , and a pressure-inducing tube 33 .

[0047] The connector 31 is configured to be disposed on the outer wall of the inner cylinder 2 within the pressure vessel 1. The connector 31 is configured to be disposed around the outer periphery of the second through hole 21 of the inner cylinder 2. A positioning tube 32 is disposed on the outer wall of the pressure vessel 1. The positioning tube 32 is disposed around the outer periphery of the first through hole 11 of the pressure vessel 1. The positioning tube 32 and the pressure-inducing tube 33 both extend in a first direction. The inlet of the pressure-inducing tube 33 passes through the positioning tube 32 and extends into the connector 31. The inlet of the pressure-inducing tube 33 communicates with the second through hole 21 so that the gas-liquid two-phase mixture within the inner cylinder 2 can pass into the pressure-inducing tube 33 through the second through hole 21. A sealing platform 34 is provided on the outer periphery of the positioning tube 32 at the end away from the pressure vessel 1. A sealing ring 35 and a sealing gasket are sleeved on the outer periphery of the pressure-inducing tube 33. The sealing gasket is located between the sealing platform 34 and the sealing ring 35. The sealing ring 35 is threadedly connected to the sealing platform 34.

[0048] The pressure-inducing pipe 33 of the pressure-inducing device of the core simulation body according to the embodiment of the present invention passes through two layers of cylinders (pressure vessel 1 and inner cylinder 2), thereby enabling the pressure-inducing pipe 33 to take pressure under the high-temperature and high-pressure working conditions of the core simulation body, and ensuring that the pressure is leak-free through different fixing and sealing means, and the pressure-inducing device can take pressure in the inner part of the high-pressure vessel (pressure vessel 1), ensuring that there is no leakage both inside and outside. Then the gas-water separator 41 is passed to separate the gas and liquid, and the gas discharged from the pressure-inducing pipe 33 can be discharged in time, reducing the measurement error caused by the gas collection in the pressure-inducing pipe 33 and improving the accuracy of the measurement. Therefore, the core simulation body according to the embodiment of the present invention can be used to measure the cavitation fraction of the core rod bundle cross section under a large rupture accident, providing important support for the core two-phase flow research and core heat transfer research under the prototype accident working conditions.

[0049] Therefore, the pressure-inducing device for the core dummy according to the embodiment of the present invention has the advantages of convenient pressure measurement and high measurement accuracy.

[0050] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0051] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0052] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0053] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0054] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0055] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A core simulation body, characterized in that: include: A pressure vessel, wherein a side wall of the pressure vessel has a plurality of first through holes extending therethrough, wherein the plurality of first through holes are spaced apart in a vertical direction; an inner cylinder, the inner cylinder being disposed within the pressure vessel, the sidewall of the inner cylinder being spaced apart from the sidewall of the pressure vessel, the sidewall of the inner cylinder having a plurality of second through holes extending therethrough, the plurality of second through holes being spaced apart in the vertical direction, and the plurality of second through holes corresponding one-to-one to the plurality of first through holes in the first direction; a plurality of pressure-inducing devices, each of the pressure-inducing devices comprising a connecting piece, a positioning tube, and a pressure-inducing tube, the connecting piece being located in the pressure vessel and provided on the outer side wall of the inner cylinder, the connecting pieces being arranged one-to-one in an annular manner on the outer circumference of the second through hole, the positioning tubes being provided on the outer side wall of the pressure vessel, the positioning tubes being arranged one-to-one in an annular manner on the outer circumference of the first through hole, the positioning tubes and the pressure-inducing tubes both extending along the first direction, the inlet of the pressure-inducing tube passing through the positioning tube and extending into the connecting piece, the inlet of the pressure-inducing tube being in communication with the second through hole so that a gas-liquid two-phase mixture in the inner cylinder can pass into the pressure-inducing tube through the second through hole; The core simulation body includes a detection unit, and the detection unit includes a differential pressure transmitter, each of the differential pressure transmitters is used to measure the pressure difference of the liquid discharged from two adjacent pressure-inducing pipes in the vertical direction; There are multiple detection units, each of which includes a differential pressure transmitter and two gas-water separators. Each gas-water separator has a two-phase flow inlet, a gas outlet and a liquid single-phase outlet. The gas outlet, the two-phase flow inlet and the liquid single-phase outlet are arranged in sequence from top to bottom. The two pressure measuring ports of each differential pressure transmitter are respectively connected to the liquid single-phase outlets of the two gas-water separators through pipelines. The two gas-water separators of each detection unit are respectively connected to the outlets of two adjacent pressure pipes in the upper and lower directions.

2. The core simulation body according to claim 1, characterized in that: The gas-water separator includes an upper top plate, an annular body and a lower bottom plate connected in sequence from top to bottom. The gas-water separator is made of metal material. The annular body extends in the up and down directions. The two-phase flow inlet is opened at the lower part of the annular body. The upper top plate covers the upper opening of the annular body. The gas outlet is opened on the upper top plate. At least part of the gas outlet is a conical hole with an increasing inner diameter from top to bottom. The lower bottom plate covers the lower opening of the annular body. The liquid single-phase outlet is opened on the lower bottom plate.

3. The core simulation body according to any one of claims 1 to 2, characterized in that: The inner side of the connecting piece is provided with a thread, and the pressure-inducing tube is threadedly connected to the connecting piece.

4. The core simulation body according to claim 3, characterized in that: The pressure-inducing tube is provided with a sealing member for sealing the gap between the positioning tube and the pressure-inducing tube.

5. The core simulation body according to claim 4, characterized in that: A sealing platform is provided on the outer peripheral side of one end of the positioning tube away from the pressure vessel. The sealing member includes a sealing ring and a sealing gasket. The sealing ring and the sealing gasket are sleeved on the pressure-inducing tube. The sealing gasket is located between the sealing platform and the sealing ring. The sealing ring is threadedly connected to the sealing platform.

6. The core simulation body according to claim 4, characterized in that: The connecting piece is welded to the outer wall of the inner cylinder; The positioning tube is welded to the outer side wall of the pressure vessel; The pressure-resistant strength of the pressure-inducing pipe is greater than or equal to 8 MPa.

7. The core simulation body according to claim 1, characterized in that: The diameter of the second through hole is greater than or equal to 0.5 mm and less than or equal to 1.5 mm; A stepped hole is provided at the inlet of the pressure-inducing tube. The diameter of at least part of the stepped hole decreases in the first direction along a direction adjacent to the second through hole. The diameter of the stepped hole is greater than or equal to the diameter of the second through hole.

8. A pressure-inducing device used in a core simulation body according to any one of claims 1 to 7, characterized in that: The cam is connected to the pressure relief valve of the pressure relief valve, and the pressure relief valve is connected to the pressure relief valve of the pressure relief valve.

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