Molten salt heater for solving problem of thermal expansion and cold contraction of metal shell of electric heating body

Abstract

The utility model discloses a fused salt heater for solving the problem of thermal expansion and cold contraction of a metal shell of an electric heating body, which comprises the electric heating body, the electric heating body comprises an electric heating wire, a lead-out core rod I and a lead-out core rod II, the electric heating wire is arranged in the metal shell of the electric heating body, and the lead-out core rod I and the lead-out core rod II are respectively arranged on bus copper bars on corresponding sides. The first leading-out core rod and the second leading-out core rod are connected to the two ends of the electric heating wire respectively, the second insulating sleeve is arranged between the electric heating body metal shell and the electric heating wire in a sleeved mode, the first insulating sleeve is arranged on the first leading-out core rod in a sleeved mode, the third insulating sleeve is arranged on the second leading-out core rod in a sleeved mode, the three insulating sleeves are sequentially connected in a nested mode, and the cylindrical spring is installed between the third insulating sleeve and the second bus copper bar. The utility model has the characteristics that the spring is arranged to ensure that the fixed gap between the insulating sleeves is kept unchanged and the insulativity of the electric heating body is kept unchanged when the metal shell and the metal container of the electric heating body are subjected to thermal expansion and elongation, so that the overall insulativity of equipment cannot be reduced due to temperature rise, and the operation safety is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of electric energy storage, and particularly relates to a molten salt heater for solving the problem of thermal expansion and contraction of the metal shell of an electric heating element. Background Art

[0002] A molten salt heater fills molten salt in a metal container, and the temperature of the molten salt is raised to the required temperature through an electric heating element. During the heating process, the metal container and the metal shell of the electric heating element will thermally expand and elongate as the temperature rises. There are three nested and connected insulating sleeves inside the metal shell of the electric heating element. Since the thermal expansion coefficient of the insulating sleeve is different from that of the metal, the gap between the three sleeves will increase as the temperature rises, and the high voltage on the internal electric heating wire will discharge along the gap to the metal shell of the electric heating element, thus forming an electrical fault. Summary of the Utility Model

[0003] The purpose of the utility model is to overcome the above-mentioned problems and provide a molten salt heater for solving the problem of thermal expansion and contraction of the metal shell of an electric heating element.

[0004] The technical solution adopted by the utility model to achieve the above purpose is as follows:

[0005] A molten salt heater for solving the problem of thermal expansion and contraction of the metal shell of an electric heating element includes an electric heating element inserted on a metal container. The electric heating element includes an electric heating wire, a metal shell of the electric heating element, a lead-out core rod one, and a lead-out core rod two. The metal shell of the electric heating element is inserted on the metal container. The electric heating wire is arranged inside the metal shell of the electric heating element. One end of the lead-out core rod one is installed on a busbar copper row one, and the other end is inserted into one end of the metal shell of the electric heating element and connected to one end of the electric heating wire. One end of the lead-out core rod two is installed on a busbar copper row two, and the other end is inserted into the other end of the metal shell of the electric heating element and connected to the other end of the electric heating wire. An insulating sleeve two is sleeved between the metal shell of the electric heating element and the electric heating wire. An insulating sleeve one is sleeved on the lead-out core rod one. An insulating sleeve three is sleeved on the lead-out core rod two. The insulating sleeve one, the insulating sleeve two, and the insulating sleeve three are nested and connected in sequence. A cylindrical spring is installed between the insulating sleeve three and the busbar copper row two. The cylindrical spring is sleeved on the lead-out core rod two.

[0006] A gasket is installed between the cylindrical spring and the insulating sleeve three.

[0007] A sealing ring is sleeved at the end face of the insulating sleeve of the lead-out core rod one, and the sealing ring is welded on the lead-out core rod one.

[0008] Fixed supports and follower supports are installed on the bottom surface of the metal container. The lower end of the fixed support is fixedly installed on a fixing member. The lower end of the follower support is installed with a roller, and the roller is placed on the fixing member.

[0009] At the end face of the metal shell of the heating element, a shoulder is integrally provided on the insulating sleeve one, and the shoulder is in contact with the end face of the metal shell of the heating element.

[0010] The connection between the metal container and the metal shell of the heating element is welded.

[0011] At the upper end of the metal container, a low-temperature medium inlet is provided, and at the lower end of the metal container, a high-temperature medium outlet is provided.

[0012] The characteristics of the present utility model are: by arranging springs, when the metal shell of the heating element and the metal container expand and elongate due to heat, a fixed gap is maintained between the insulating sleeves, the insulation of the heating element remains unchanged, the overall insulation of the equipment will not be reduced due to temperature rise, and the safety of operation is ensured. Description of the Drawings

[0013] Figure 1 is a schematic structural diagram of the present utility model.

[0014] Wherein: 1. Metal container; 11. Low-temperature medium inlet; 12. High-temperature medium outlet; 13. Fixed support; 14. Follow-up support; 15. Roller; 2. Heating element; 21. Heating wire; 22. Metal shell of the heating element; 23. Lead-out core rod one; 231. Sealing ring; 24. Lead-out core rod two; 25. Insulating sleeve one; 251. Shoulder; 26. Insulating sleeve two; 27. Insulating sleeve three; 3. Busbar copper row one; 4. Busbar copper row two; 5. Cylindrical spring; 51. Gasket; 6. Fixing piece. Detailed Embodiment

[0015] Such as Figure 1As shown, the utility model is a molten salt heater that solves the problem of thermal expansion and contraction of the metal shell of the electric heating body, comprising an electric heating body 2 inserted in a metal container 1, the upper end of the metal container 1 is provided with a low-temperature medium inlet 11, the lower end of the metal container 1 is provided with a high-temperature medium outlet 12, the bottom surface of the metal container 1 is provided with a fixed support 13 and a follower support 14, the lower end of the fixed support 13 is fixedly installed on a fixing member 6 (the ground or other connecting parts), the lower end of the follower support 14 is provided with a roller 15, the roller 15 is placed on the fixing member 6, when the metal container 1 is thermally expanded and elongated, the roller 15 moves on the fixing member 6 without restriction, the electric heating body 2 comprises a heating wire 21, an electric The electric heating metal shell 22, the lead-out core rod 1 23, and the lead-out core rod 24, the electric heating metal shell 22 is inserted on the metal container 1, and the connection between the two is welded, the electric heating wire 21 is arranged in the electric heating metal shell 22, one end of the lead-out core rod 1 23 is installed on the bus copper bar 1 3, the two are fixed by a nut, and the other end is inserted in one end of the electric heating metal shell 22 and connected to one end of the electric heating wire 21, one end of the lead-out core rod 2 24 is installed on the bus copper bar 2 4, the two are fixed by a nut, and the other end is inserted in the other end of the electric heating metal shell 22 and connected to the other end of the electric heating wire 21, and an insulating sleeve is set between the electric heating metal shell 22 and the electric heating wire 21 The lead-out core rod 26 is provided with an insulating sleeve 25, and the lead-out core rod 23 is provided with a sealing ring 231 at the end face of the insulating sleeve 25, and the sealing ring 231 is welded on the lead-out core rod 23. The insulating sleeve 25 is provided with a shoulder 251 at the end face of the electric heating element metal shell 22, and the shoulder 251 is in contact with the end face of the electric heating element metal shell 22. The shoulder 251 is provided to prevent the insulating sleeve 25 from entering the electric heating element metal shell 22 during thermal expansion. The lead-out core rod 24 is provided with an insulating sleeve 3 27, and the insulating sleeve 1 25, the insulating sleeve 26, and the insulating sleeve 3 27 are nested and connected in sequence, and the insulating sleeve 3 27 A cylindrical spring 5 is installed between the bus copper bar 24, and the cylindrical spring 5 is sleeved on the lead-out core rod 24. A gasket 51 is installed between the cylindrical spring 5 and the insulating sleeve 3 27. The cylindrical spring 5 is pre-compressed when installed. During the heating process, when the metal container 1 and the metal shell 22 of the electric heating element expand and stretch out along the outer wall of the insulating sleeve 3 27, the insulating sleeve 3 27 is supported by the cylindrical spring 5 and kept in a fixed position. In this way, the insulating sleeve 1 25, the insulating sleeve 2 26, and the insulating sleeve 3 27 inside the electric heating element 2 maintain a fixed gap, thereby maintaining the insulation of the electric heating element 2 unchanged, so that the overall insulation of the equipment will not be reduced due to the increase in temperature, thereby ensuring the safety of operation.

[0016] The above are only the preferred specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution and inventive concept of the present utility model, making equivalent substitutions or changes, shall be covered by the protection scope of the present utility model.

Claims

1. A molten salt heater for solving the problem of thermal expansion and contraction of the metal shell of an electrothermal body, characterized in that: It includes a heating element inserted on a metal container. The heating element includes a heating wire, a metal shell of the heating element, a lead-out core rod 1, and a lead-out core rod 2. The metal shell of the heating element is inserted on the metal container. The heating wire is arranged inside the metal shell of the heating element. One end of the lead-out core rod 1 is installed on a busbar copper row 1, and the other end is inserted into one end of the metal shell of the heating element and connected to one end of the heating wire. One end of the lead-out core rod 2 is installed on a busbar copper row 2, and the other end is inserted into the other end of the metal shell of the heating element and connected to the other end of the heating wire. An insulating sleeve 2 is sleeved between the metal shell of the heating element and the heating wire. An insulating sleeve 1 is sleeved on the lead-out core rod 1. An insulating sleeve 3 is sleeved on the lead-out core rod 2. The insulating sleeve 1, the insulating sleeve 2, and the insulating sleeve 3 are nested and connected in sequence. A cylindrical spring is installed between the insulating sleeve 3 and the busbar copper row 2, and the cylindrical spring is sleeved on the lead-out core rod 2.

2. The molten salt heater for solving the problem of thermal expansion and contraction of the metal shell of the electrothermal body according to claim 1, wherein: A gasket is installed between the cylindrical spring and the insulating sleeve 3.

3. The molten salt heater for solving the problem of thermal expansion and contraction of the metal shell of the electrothermal body according to claim 1, characterized in that: A sealing ring is sleeved at the end face of the insulating sleeve 1 on the lead-out core rod 1, and the sealing ring is welded on the lead-out core rod 1.

4. A molten salt heater for solving the problem of thermal expansion and contraction of the metal shell of the electric heating element according to claim 1, characterized in that: Fixed supports and follower supports are installed on the bottom surface of the metal container. The lower end of the fixed support is fixedly installed on a fixing piece, and the lower end of the follower support is equipped with a roller, and the roller is placed on the fixing piece.

5. The molten salt heater for solving the problem of thermal expansion and contraction of the metal shell of the electrothermal body according to claim 1, characterized in that: A shoulder is integrally provided at the end face of the insulating sleeve 1 on the metal shell of the heating element, and the shoulder is in contact with the end face of the metal shell of the heating element.

6. The molten salt heater for solving the problem of thermal expansion and contraction of the metal shell of the electrothermal body according to claim 1, characterized in that: The connection between the metal container and the metal shell of the heating element is welded.

7. A molten salt heater for solving the problem of thermal expansion and contraction of the metal shell of an electrothermal body according to claim 1, characterized in that: A low-temperature medium inlet is opened at the upper end of the metal container, and a high-temperature medium outlet is opened at the lower end of the metal container.

Images