Single-end lead-out N wire connecting shell type electric heating element for nuclear fuel rod simulation

Abstract

The utility model discloses a single-end lead-out N wire shell connection type electric heating element for simulating a nuclear fuel rod, which comprises a metal sleeve, an electric heating wire is arranged in the metal sleeve, an insulating material is filled between the electric heating wire and the metal sleeve, and an insulator for plugging is arranged at the access end of the metal sleeve. A first lead-out rod made of a conductive material is fixed in the insulator and is connected with one end of the electric heating wire, and an L-shaped lead wire penetrates through the insulator and is connected with the first lead-out rod, and is characterized in that the electric heating wire is in a spiral coil pipe shape and is arranged at the axis position of the metal sleeve, and the other end of the electric heating wire is connected with a second lead-out rod made of a conductive material; the other end of the second lead-out rod is fixedly connected with a bottom sealing plate at the end of the metal sleeve, a metal sleeve is arranged on the outer side of the insulator, one end of the metal sleeve is connected with the metal sleeve, and the other end of the metal sleeve is connected with the N lead. According to the utility model, the safety and the simulation effect can be better improved, and the simulation test requirements of the nuclear fuel rod can be better met.

Description

Technical Field

[0001] The utility model relates to the technical field of electric heating elements, in particular to a single-end lead-out N-wire shell-connected electric heating element for nuclear fuel rod simulation. Background Art

[0002] The fusion of light nuclei and the fission of heavy nuclei both release energy, known as nuclear fusion energy and nuclear fission energy, respectively. Fusion and fission release large amounts of heat, which is converted from nuclear energy to mechanical energy to electrical energy. This electricity is known as nuclear power. As traditional resources are becoming increasingly depleted, the potential for nuclear power is growing. Nuclear power generation typically uses nuclear fuel rods to generate heat, which is then heated to generate steam. Nuclear fuel rods are typically uranium dioxide ceramic pellets sintered from a mixture of uranium powder and are highly radioactive. Therefore, when studying the thermal properties of nuclear fuel rods, such as in critical heat flux tests, it is necessary to use electric heating rods instead of nuclear fuel rods.

[0003] The applicant previously applied for patent CN216600121U, which disclosed an electric heating element for nuclear fuel rod simulation. The element comprises a metal casing, a heating wire disposed within the casing, an insulating material filled between the heating wire and the casing, an insulator provided at the end of the casing for sealing, a lead-out rod fixed within the insulator and connected to the heating wire, and is characterized by the insulating material being boron carbide. This utility model has the advantages of significantly improving the heating rate and heat output, better meeting the requirements of nuclear fuel rod simulation testing, and enhancing the product's safety and service life.

[0004] However, the aforementioned utility model patent uses a double-ended lead-out structure, meaning the two terminals of the heating wire are connected to the two ends of the metal sleeve. However, in some nuclear fuel rod thermal performance research and testing, the electric heating rods that replace the nuclear fuel rods are installed with a single-ended insertion method, which requires the power input of the electric heating rod to be a single-ended lead-out structure.

[0005] Conventional single-ended electric heating rods feature a U-shaped heating wire within a metal sheath. This means that when the heating wire reaches the bottom of the sheath, it folds back to the access end, where its two ends are connected to the L and N leads, respectively. This nuclear fuel rod simulation component has the following drawbacks: 1. The outer edges of the U-shaped heating wire are relatively close to the metal sheath, which can easily lead to contact or electrical leakage between the wire and the sheath, resulting in poor safety. 2. During operation, the metal sheath portion adjacent to the U heating wire reaches a relatively higher temperature, while the remaining portion is relatively cooler. This uneven heating can affect the simulation performance of the electric heating rod, and thus the test results.

[0006] Therefore, those skilled in the art need to consider designing a single-end-leaded nuclear fuel rod simulation electric heating element that can better improve safety and simulation effect. Utility Model Content

[0007] In view of the above-mentioned deficiencies in the existing technology, the technical problem to be solved by the present invention is: how to provide a single-ended N-wire shell-connected electric heating element for nuclear fuel rod simulation that can better improve safety and simulation effects and better meet the needs of nuclear fuel rod simulation tests.

[0008] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0009] A single-end lead-out N-wire shell-connected electric heating element for nuclear fuel rod simulation includes a metal sleeve, a heating wire is arranged inside the metal sleeve, an insulating material is filled between the heating wire and the metal sleeve, an insulator for sealing is provided at the access end of the metal sleeve, a first lead-out rod of conductive material is fixed in the insulator and connected to one end of the heating wire, an L lead is provided to penetrate the insulator and connect to the first lead-out rod, and is characterized in that the heating wire is a long strip in the shape of a spiral coil and is arranged at the axial center of the metal sleeve, the other end of the heating wire is connected to a second lead-out rod of conductive material, the second lead-out rod is located at the axial center of the metal sleeve and the other end is fixedly connected to the bottom plate at the end of the metal sleeve, a metal sleeve is provided on the outside of the insulator, one end of the metal sleeve is connected to the metal sleeve, and the other end of the metal sleeve is connected to the N lead.

[0010] In this way, this solution uses the metal sleeve itself as a conductive element to guide the current at the other end of the heating wire back to connect it to the N lead, thereby realizing single-end lead-out of the L lead and the N lead. At the same time, the heating wire can be arranged in the middle of the metal sleeve, thereby avoiding the position deviation of the heating wire causing breakdown and leakage between the heating wire and the metal sleeve, thereby better improving safety. At the same time, the circumferential heating of the metal sleeve is more uniform, which improves the simulation effect and better meets the experimental requirements of nuclear fuel rod simulation.

[0011] Furthermore, the insulating material filled between the heating wire and the metal sleeve is powdered magnesium oxide or boron carbide.

[0012] In this way, the insulation between the heating wire and the metal sleeve can be better ensured.

[0013] Furthermore, the insulator is made of porcelain glaze material.

[0014] The material has good insulation effect, is easy to seal and has low cost.

[0015] Furthermore, the first lead-out rod and the second lead-out rod are made of metal rods to achieve better electrical conduction.

[0016] Furthermore, the metal sleeve is formed by filling the powdered insulating material and then shrinking the sleeve.

[0017] In this way, the insulating material can be better compressed, and the thermal conductivity and insulation performance can be improved.

[0018] Furthermore, a cylindrical retaining piece made of insulating material is provided in the metal sleeve, the outer side of the retaining piece is in contact with and fixed to the inner wall of the metal sleeve, and the heating wire is fixed in the retaining piece.

[0019] In this way, the outer periphery of the heating wire and the metal sleeve can be better kept from contacting each other, especially during the tube shrinking process, the heating wire and the metal sleeve will not be connected, which can better ensure safety.

[0020] Furthermore, the inside and outside of the holder are filled with powdered insulating material.

[0021] In this way, insulation and thermal conductivity are better guaranteed.

[0022] Furthermore, the retaining member is made of insulating material.

[0023] In this way, insulation and thermal conductivity are better guaranteed.

[0024] Furthermore, a step is provided on the outer surface of the metal sleeve, and the diameter of the step becomes smaller towards one end of the metal sleeve, so as to facilitate the installation and positioning of the heating element itself when in use.

[0025] In summary, the present invention can better improve safety and simulation effects, and can better meet the needs of nuclear fuel rod simulation tests. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural diagram of a specific implementation of the utility model. DETAILED DESCRIPTION

[0027] The present invention will be described in further detail below with reference to the accompanying drawings.

[0028] When implementing: Figure 1As shown, a single-end lead-out N-wire shell-type electric heating element for nuclear fuel rod simulation includes a metal sleeve 1, a heating wire 2 is arranged inside the metal sleeve 1, an insulating material 3 is filled between the heating wire 2 and the metal sleeve 1, an insulator 4 for sealing is provided at the access end of the metal sleeve 1, a first lead-out rod 5 of conductive material is fixed in the insulator 4 and connected to one end of the heating wire 2, an L lead 6 is provided to pass through the insulator 4 and connect to the first lead-out rod 5, the characteristic of which is that the heating wire 2 is a spiral coil-shaped long strip and is arranged at the axial center of the metal sleeve 1, the other end of the heating wire 2 is connected to a second lead-out rod 7 of conductive material, the second lead-out rod 7 is located at the axial center of the metal sleeve and the other end is fixedly connected to the bottom plate at the end of the metal sleeve 1, a metal sleeve 8 is provided on the outside of the insulator 4, one end of the metal sleeve 8 is connected to the metal sleeve 1, and the other end of the metal sleeve 8 is connected to the N lead 9.

[0029] In this way, this solution uses the metal sleeve itself as a conductive element to guide the current at the other end of the heating wire back to connect it to the N lead, thereby realizing single-end lead-out of the L lead and the N lead. At the same time, the heating wire can be arranged in the middle of the metal sleeve, thereby avoiding the position deviation of the heating wire causing breakdown and leakage between the heating wire and the metal sleeve, thereby better improving safety. At the same time, the circumferential heating of the metal sleeve is more uniform, which improves the simulation effect and better meets the experimental requirements of nuclear fuel rod simulation.

[0030] The insulating material 3 filled between the heating wire 2 and the metal sleeve 1 is powdered magnesium oxide or boron carbide.

[0031] In this way, the insulation between the heating wire and the metal sleeve can be better ensured.

[0032] Wherein, the insulator 4 is made of porcelain glaze material.

[0033] The material has good insulation effect, is easy to seal and has low cost.

[0034] The first lead-out rod 5 and the second lead-out rod 7 are made of metal rods to achieve better electrical conduction.

[0035] The metal sleeve 1 is obtained by filling powdered insulating material and then shrinking it.

[0036] In this way, the insulating material can be better compressed, and the thermal conductivity and insulation performance can be improved.

[0037] A cylindrical retaining member 10 made of insulating material is further provided in the metal sleeve 1. The outer side of the retaining member is in contact with and fixed to the inner wall of the metal sleeve, and the heating wire is fixed in the retaining member.

[0038] Thus, the electric heating wire and the metal sleeve are prevented from contacting each other, especially during the shrinkage process, and the safety is ensured.

[0039] The inside and outside of the holding member 10 are filled with powder insulation material.

[0040] Thus, the insulation and heat conduction are ensured.

[0041] The holding member 10 is made of insulation material.

[0042] Thus, the insulation and heat conduction are ensured.

[0043] The outer surface of the metal sleeve 8 is provided with a step, and the diameter of the step towards the end of the metal sleeve is reduced. Thus, the installation and positioning of the heating element are facilitated.

Claims

1. A single-end lead-out N-wire shell-type electric heating element for nuclear fuel rod simulation, comprising a metal sleeve, a heating wire disposed within the metal sleeve, an insulating material filled between the heating wire and the metal sleeve, an insulator for blocking the access end of the metal sleeve, a first lead-out rod of conductive material fixed within the insulator and connected to one end of the heating wire, an L lead wire passing through the insulator and connected to the first lead-out rod, characterized in that: The heating wire is a long strip in the shape of a spiral coil and is arranged at the axial center of the metal sleeve. The other end of the heating wire is connected to a second lead-out rod made of conductive material. The second lead-out rod is located at the axial center of the metal sleeve and the other end is fixedly connected to the bottom plate at the end of the metal sleeve. A metal sleeve is provided on the outside of the insulator, one end of the metal sleeve is connected to the metal sleeve, and the other end of the metal sleeve is connected to the N lead.

2. The single-ended N-wire shell-connected electric heating element for nuclear fuel rod simulation according to claim 1, characterized in that: The insulating material filled between the heating wire and the metal sleeve is powdered magnesium oxide or boron carbide.

3. The single-ended N-wire shell-connected electric heating element for nuclear fuel rod simulation according to claim 2, characterized in that: The insulator is made of porcelain glaze material.

4. The single-ended N-wire shell-connected electric heating element for nuclear fuel rod simulation according to claim 1, characterized in that: The first lead-out rod and the second lead-out rod are made of metal rods.

5. The single-ended N-wire shell-connected electric heating element for nuclear fuel rod simulation according to claim 1, characterized in that: The metal sleeve is formed by filling the insulating material in powder form and then shrinking it.

6. The single-ended N-wire shell-connected electric heating element for nuclear fuel rod simulation according to claim 5, characterized in that: A cylindrical retaining piece made of insulating material is also arranged in the metal sleeve. The outer side of the retaining piece is in contact with and fixed to the inner wall of the metal sleeve, and the heating wire is fixed in the retaining piece.

7. The single-ended N-wire shell-connected electric heating element for nuclear fuel rod simulation according to claim 6, characterized in that: The inside and outside of the holder are filled with powdered insulating material.

8. The single-ended N-wire shell-connected electric heating element for nuclear fuel rod simulation according to claim 7, characterized in that: The retaining member is made of insulating material.

9. The single-ended N-wire shell-connected electric heating element for nuclear fuel rod simulation according to claim 1, characterized in that: The outer surface of the metal sleeve is provided with a step, and the diameter of the step becomes smaller towards one end of the metal sleeve.

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