Direct-current GIS shell heat dissipation structure and direct-current GIS

Abstract

The invention discloses a direct current GIS shell heat dissipation structure and a direct current GIS, the direct current GIS shell heat dissipation structure comprises a GIS shell body, a plurality of heat pipes are arranged on the GIS shell body at intervals in the height direction, each heat pipe comprises an annular pipe body and a plurality of exposed pipe bodies distributed on the outer side of the annular pipe body in the radial direction, one end of each exposed pipe body is of a closed structure, and the other end of each exposed pipe body is communicated with the annular pipe body; the annular pipe body is located in the GIS shell body, and the exposed pipe body penetrates through the GIS shell body and extends out of the GIS shell body; and radiating fins are arranged outside the GIS shell body and are fixed on the exposed pipe body. According to the invention, on the basis of not changing the arrangement of internal equipment of the direct current GIS and the volume of the shell, the heat conduction area in the shell is greatly increased, the temperature of a heating element and a gas medium in the operation of the direct current GIS is reduced, the damage and deformation of the shell caused by thermal expansion are further avoided, and the long-term through-flow stability of the direct current GIS is improved.

Description

Technical Field

[0001] The present application relates to the technical field of direct current GIS, and in particular to a direct current GIS shell heat dissipation structure and a direct current GIS. Background Art

[0002] GIS (Gas Insulated Switchgear) is a gas-insulated metal-enclosed switchgear with advantages such as compact structure and small footprint. However, during long-term flow, the current flowing through the GIS will cause the temperature of the conductor and its shell to rise, easily reaching a temperature rise of 40~50K. At the same time, the temperature rise will cause the volume of the high-pressure gas filled in the shell to expand, which may cause the expansion and deformation of the GIS shell and the conductor metal material, thereby endangering the safety of the equipment.

[0003] The existing heat dissipation solutions for GIS are mainly for AC GIS, for example: reducing the temperature rise by increasing the shell diameter and the insulation support diameter, but it will cause a significant increase in the volume of the GIS equipment; or adding a heat convection device around the current-carrying conductor to achieve the purpose of heat dissipation through the circulation of high-pressure gas inside the shell, but the heat dissipation effect of the shell and the external environment is not good, and it will increase the difficulty of installing the GIS equipment. The above solutions cannot meet the requirements of DC GIS for highly compact structure, maintenance-free, and high reliability. Therefore, proposing a reliable DC GIS shell heat dissipation solution has become a technical problem that needs to be solved in this field. Summary of the invention

[0004] The embodiment of the present application provides a DC GIS shell heat dissipation structure and a DC GIS, which can greatly improve the heat dissipation effect without changing the internal device layout and shell volume of the DC GIS.

[0005] A first aspect of the present application provides a DC GIS housing heat dissipation structure, comprising: a GIS housing body;

[0006] A plurality of heat pipes are arranged on the GIS housing body at intervals along the height direction;

[0007] The heat pipe comprises an annular tube body and a plurality of exposed tube bodies radially distributed outside the annular tube body;

[0008] One end of the exposed tube body is a closed structure, and the other end is connected to the annular tube body;

[0009] The annular tube body is located in the GIS shell body;

[0010] The exposed tube body passes through the GIS shell body and extends out of the GIS shell body;

[0011] The GIS housing body is provided with heat dissipation fins;

[0012] The heat dissipation fins are fixed on the exposed tube body.

[0013] Optionally, each of the exposed tube bodies is sequentially sleeved with a plurality of the heat dissipation fins from the inside to the outside.

[0014] Optionally, the heat dissipation fins are arc-shaped, and the heat dissipation fins are coaxially arranged with the GIS shell body.

[0015] Optionally, there is a gap between the heat dissipation fins on two adjacent exposed tube bodies of the heat pipe.

[0016] Optionally, the connection between the heat dissipation fin and the exposed tube body is coated with silicone grease or graphene.

[0017] Optionally, the heat dissipation fins are made of aluminum alloy, carbon steel or stainless steel;

[0018] The heat pipe is a hollow copper pipe;

[0019] The heat pipe is filled with heat-conducting liquid.

[0020] Optionally, an annular hollow cavity is coaxially fixed to the inner wall of the GIS shell body;

[0021] The annular tube bodies of the plurality of heat pipes are all coaxially arranged with the annular hollow cavity;

[0022] The annular tube part is embedded in the annular hollow cavity, and the exposed tube passes through the annular hollow cavity and the GIS shell body in sequence, and extends out of the GIS shell body;

[0023] The annular hollow cavity is filled with gallium-based liquid alloy.

[0024] Optionally, the gallium-based liquid alloy is made of gallium, indium and tin, wherein the mass fraction of gallium is 70-80%, the mass fraction of indium is 10-15%, and the mass fraction of tin is 5-20%. The gallium-based liquid alloy has a melting point of 5-10°C and a thermal conductivity of 30-50 W / (m·K).

[0025] Optionally, a plurality of the exposed tube bodies are evenly distributed on the outside of the annular tube body.

[0026] Optionally, the plurality of heat pipes are parallel to each other and are equidistantly distributed.

[0027] A second aspect of the present application provides a DC GIS, which includes: the above-mentioned DC GIS shell heat dissipation structure.

[0028] It can be seen from the above technical solutions that the embodiments of the present application have the following advantages: the heat dissipation structure of the DC GIS shell avoids changes to the layout of the internal equipment of the DC GIS, realizes the compactness of the heat dissipation structure, and avoids a substantial increase in the shell volume. A plurality of heat pipes are arranged at intervals along the height direction on the GIS shell body, wherein the heat pipe includes an annular tube body and a plurality of exposed tube bodies radially distributed on the outside of the annular tube body, the annular tube body is located in the GIS shell body, the exposed tube body passes through the GIS shell body, and extends out of the GIS shell body; heat dissipation fins are arranged outside the GIS shell body, and the heat dissipation fins are fixed on the exposed tube body. The cooperation of the annular tube body, the exposed tube body and the heat dissipation fins is utilized to reduce the temperature of the heating elements and the gas medium during the operation of the DC GIS, thereby avoiding damage and deformation of the shell caused by thermal expansion, and improving the long-term flow stability of the DC GIS. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a side cross-sectional view of the heat dissipation structure of the DC GIS housing in the embodiment of the present application;

[0030] Figure 2 It is a top view of the heat dissipation structure of the DC GIS housing in the embodiment of the present application;

[0031] Wherein, the accompanying drawings are marked as follows:

[0032] 1-GIS shell body, 2-heat dissipation fins, 3-annular tube body, 4-exposed tube body, 5-annular hollow cavity. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0034] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application 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 cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0035] Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] This application provides an embodiment of a DC GIS housing heat dissipation structure. Figure 1 and Figure 2 .

[0037] The DC GIS shell heat dissipation structure in this embodiment includes: a GIS shell body 1, on which a plurality of heat pipes are arranged at intervals along the height direction, the heat pipes include an annular tube body 3 and a plurality of exposed tube bodies 4 radially distributed on the outside of the annular tube body 3, one end of the exposed tube body 4 is a closed structure, and the other end is connected to the annular tube body 3; the annular tube body 3 is located in the GIS shell body 1, the exposed tube body 4 passes through the GIS shell body 1, and extends out of the GIS shell body 1; heat dissipation fins 2 are arranged outside the GIS shell body 1, and the heat dissipation fins 2 are fixed on the exposed tube body 4.

[0038] It should be noted that: the heat dissipation structure of the DC GIS shell avoids the change of the internal equipment layout of the DC GIS, realizes the compactness of the heat dissipation structure, and avoids a substantial increase in the shell volume. A plurality of heat pipes are arranged at intervals along the height direction on the GIS shell body 1, wherein the heat pipe includes an annular tube body 3 and a plurality of exposed tube bodies 4 radially distributed on the outside of the annular tube body 3, the annular tube body 3 is located in the GIS shell body 1, and the exposed tube body 4 passes through the GIS shell body 1 and extends out of the GIS shell body 1; heat dissipation fins 2 are arranged outside the GIS shell body 1, and the heat dissipation fins 2 are fixed on the exposed tube body 4. By utilizing the cooperation of the annular tube body 3, the exposed tube body 4 and the heat dissipation fins 2, the temperature of the heating elements and the gas medium during the operation of the DC GIS is reduced, thereby avoiding damage and deformation of the shell caused by thermal expansion, and improving the long-term flow stability of the DC GIS.

[0039] The above is an embodiment of a DC GIS shell heat dissipation structure provided in the embodiment of the present application. The following is an embodiment of a DC GIS shell heat dissipation structure provided in the embodiment of the present application. For details, please refer to Figure 1 and Figure 2 .

[0040] The DC GIS shell heat dissipation structure in this embodiment includes: a GIS shell body 1, on which a plurality of heat pipes are arranged at intervals along the height direction, the heat pipes include an annular tube body 3 and a plurality of exposed tube bodies 4 radially distributed on the outside of the annular tube body 3, one end of the exposed tube body 4 is a closed structure, and the other end is connected to the annular tube body 3; the annular tube body 3 is located in the GIS shell body 1, the exposed tube body 4 passes through the GIS shell body 1, and extends out of the GIS shell body 1; heat dissipation fins 2 are arranged outside the GIS shell body 1, and the heat dissipation fins 2 are fixed on the exposed tube body 4.

[0041] A plurality of heat dissipation fins 2 are sleeved sequentially from the inside to the outside on each exposed tube body 4. The plurality of heat dissipation fins 2 on each exposed tube body 4 are arranged at intervals, and the heat dissipation fins 2 located at the innermost side are in contact with the GIS shell body 1.

[0042] It should be noted that: by sleeve-connecting a plurality of heat dissipation fins 2 on each exposed tube body 4, the heat dissipation area can be effectively increased.

[0043] Preferably, the heat dissipation fins 2 are arc-shaped, and the heat dissipation fins 2 are coaxially arranged with the GIS housing body 1 .

[0044] Specifically, the heat dissipation fins 2 have a thickness of 2-5 mm, a layer spacing of 4-10 mm, and rounded edges with a diameter of 2-5 mm.

[0045] There is a gap of 4° to 6° between the heat dissipation fins 2 on two adjacent exposed tube bodies 4 of the heat pipe.

[0046] The exposed tube body 4 passes through the circular hole on the heat dissipation fin 2 to achieve connection with the heat dissipation fin 2. Preferably, the connection between the heat dissipation fin 2 and the exposed tube body 4 is coated with silicone grease or graphene, and the heat dissipation fin 2 and the exposed tube body 4 can be welded and fixed.

[0047] The heat sink fins 2 are made of aluminum alloy, carbon steel or stainless steel; the heat pipe is a hollow copper pipe filled with a heat-conducting liquid, and specifically, the heat-conducting liquid may be propylene glycol or ethanol.

[0048] An annular hollow cavity 5 is coaxially fixed to the inner wall of the GIS shell body 1, and the annular tube bodies 3 of multiple heat pipes are coaxially arranged with the annular hollow cavity 5. The annular tube bodies 3 are partially embedded in the annular hollow cavity 5, and the exposed tube bodies 4 pass through the annular hollow cavity 5 and the GIS shell body 1 in sequence and extend out of the GIS shell body 1; the annular hollow cavity 5 is filled with gallium-based liquid alloy.

[0049] It can be understood that the height of the annular hollow cavity 5 is greater than the distance between the top heat pipe and the bottom heat pipe, so that each heat pipe is embedded in the annular hollow cavity 5. Since the filled gallium-based liquid alloy has high thermal conductivity, the heat conduction area inside the GIS shell body 1 can be greatly improved.

[0050] Gallium-based liquid alloy is made of metals such as gallium, indium and tin, in which the mass fraction of gallium is 70-80%, the mass fraction of indium is 10-15%, and the mass fraction of tin is 5-20%. The melting point of gallium-based liquid alloy is 5-10°C and the thermal conductivity is 30-50W / (m·K).

[0051] A plurality of exposed tube bodies 4 are evenly distributed outside the annular tube body 3. In this embodiment, each annular tube body 3 has six exposed tube bodies 4.

[0052] The plurality of heat pipes are parallel to each other and are equidistantly distributed. In this embodiment, the number of the heat pipes is 4.

[0053] The present application also provides a DC GIS, which includes: the above-mentioned DC GIS shell heat dissipation structure.

[0054] In the actual working process of DC GIS, the exposed tube body 4 is the heat pipe condensation section, and the annular tube body 3 is the heat pipe evaporation section. When the temperature inside the DC GIS rises due to long-term flow, the high-pressure gas medium filled in the GIS shell body 1 will produce convection movement due to uneven temperature distribution, and then conduct heat conduction with the gallium-based liquid alloy in the annular hollow cavity 5. At this time, the annular tube body 3 is in direct contact with the gallium-based liquid alloy. After the internal liquid evaporates due to heat, the steam carrying the latent heat of vaporization is transported from the annular tube body 3 to the exposed tube body 4. Due to the heat dissipation effect of the heat dissipation fins 2, the steam releases heat and condenses into liquid. The condensed liquid returns to the annular tube body 3 by capillary pumping to complete a heat cycle. Through this process, heat energy is efficiently transferred from the inside of the DC GIS shell to the outside of the shell, thereby reducing the temperature of the heating elements and gas medium during the operation of the DC GIS, avoiding damage and deformation of the shell caused by thermal expansion, and improving the stability of the long-term flow of the DC GIS.

[0055] The heat dissipation structure of the DC GIS shell avoids the change of the internal equipment layout of the DC GIS, realizes the compactness of the heat dissipation structure, and avoids a substantial increase in the shell volume. By embedding the annular tube body 3 of the heat pipe into the annular hollow cavity 5 on the inner wall of the GIS shell body 1, the filled gallium-based liquid alloy has high thermal conductivity, which greatly improves the heat conduction area inside the shell, thereby efficiently transferring heat energy from the inside of the DC GIS shell to the outside of the shell. At the same time, multiple layers of heat dissipation fins 2 are sleeved on the exposed tube body 4 of the heat pipe, which effectively increases the heat dissipation area, thereby reducing the temperature of the heating elements and the gas medium during the operation of the DC GIS, avoiding damage and deformation of the shell due to thermal expansion, and improving the long-term flow stability of the DC GIS.

[0056] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A DC GIS shell heat dissipation structure, characterized in that: include: GIS shell body; A plurality of heat pipes are arranged on the GIS housing body at intervals along the height direction; The heat pipe comprises an annular tube body and a plurality of exposed tube bodies radially distributed outside the annular tube body; One end of the exposed tube body is a closed structure, and the other end is connected to the annular tube body; The annular tube body is located in the GIS shell body; The exposed tube body passes through the GIS shell body and extends out of the GIS shell body; The GIS housing body is provided with heat dissipation fins; The heat dissipation fins are fixed on the exposed tube body.

2. The DC GIS shell heat dissipation structure according to claim 1 is characterized in that: A plurality of heat dissipation fins are sequentially sleeved on each of the exposed tube bodies from the inside to the outside.

3. The DC GIS shell heat dissipation structure according to claim 2 is characterized in that: The heat dissipation fins are in an arc shape, and the heat dissipation fins are coaxially arranged with the GIS shell body.

4. The DC GIS shell heat dissipation structure according to claim 2 is characterized in that: There is a gap between the heat dissipation fins on two adjacent exposed tube bodies of the heat pipe.

5. The DC GIS shell heat dissipation structure according to claim 1 is characterized in that: The connection between the heat dissipation fin and the exposed tube body is coated with silicone grease or graphene.

6. The DC GIS shell heat dissipation structure according to claim 1 is characterized in that: The heat dissipation fins are made of aluminum alloy, carbon steel or stainless steel; The heat pipe is a hollow copper pipe; The heat pipe is filled with heat-conducting liquid.

7. The DC GIS housing heat dissipation structure according to claim 1 is characterized in that: An annular hollow cavity is coaxially fixed to the inner wall of the GIS shell body; The annular tube bodies of the plurality of heat pipes are all coaxially arranged with the annular hollow cavity; The annular tube part is embedded in the annular hollow cavity, and the exposed tube passes through the annular hollow cavity and the GIS shell body in sequence, and extends out of the GIS shell body; The annular hollow cavity is filled with gallium-based liquid alloy.

8. The DC GIS housing heat dissipation structure according to claim 7 is characterized in that: The gallium-based liquid alloy is made of gallium, indium and tin, wherein the mass fraction of gallium is 70-80%, the mass fraction of indium is 10-15%, and the mass fraction of tin is 5-20%. The melting point of the gallium-based liquid alloy is 5-10°C, and the thermal conductivity is 30-50W / (m·K).

9. The DC GIS housing heat dissipation structure according to claim 1, characterized in that: The plurality of exposed tube bodies are evenly distributed outside the annular tube body.

10. The DC GIS housing heat dissipation structure according to claim 1, characterized in that: The plurality of heat pipes are parallel to each other and are distributed at equal distances.

11. A DC GIS, characterized in that: include: The DC GIS shell heat dissipation structure according to any one of claims 1 to 10.

Images