Heat dissipation device for improving temperature rise performance of large-current gas-insulated switchgear and gas-insulated switchgear

Abstract

The invention discloses a heat dissipation device for improving the temperature rise performance of a large-current gas-insulated switchgear and the gas-insulated switchgear, the heat dissipation device comprises an air duct heat exchange cavity, the air duct heat exchange cavity comprises a corridor bridge part and area expansion heat exchange parts located at the two end sides of the corridor bridge part, the corridor bridge part is communicated with the area expansion heat exchange parts at the two end sides respectively, and the area expansion heat exchange parts are located at the two end sides of the corridor bridge part; an air inlet is formed in the top side, corresponding to one area-expanded heat exchange part, of the air duct heat exchange cavity, an air outlet is formed in the top side, corresponding to the other area-expanded heat exchange part, of the air duct heat exchange cavity, a flange seat is arranged on the peripheral side, corresponding to the air inlet and the air outlet, of the air duct heat exchange cavity, and the air duct heat exchange cavity can be connected to the top of the inner side of the inflatable cabinet through the flange seat; the fan is detachably mounted at the air outlet, airflow in the air duct heat exchange cavity takes away gas heat in the gas-insulated switchgear to control temperature rise of the gas-insulated switchgear, the gas-insulated switchgear comprises a heat device, a gas box and a mounting seat plate, the heat dissipation device is arranged in the top of the gas box, the fan is easy and convenient to replace, operation of the gas-insulated switchgear is not affected, heat dissipation is efficient, and the temperature rise of the gas-insulated switchgear is effectively controlled.

Description

Technical Field

[0001] This invention belongs to the field of power supply and distribution, medium and low voltage switch technology, and specifically relates to a heat dissipation device and gas-filled switchgear for improving the temperature rise performance of high current gas-filled switchgear. Background Technology

[0002] High-voltage electrical equipment generates heat during operation. The main problem with this heat is that excessively high temperatures in components can alter the physical and chemical properties of the materials, degrade their mechanical and electrical properties, and ultimately lead to malfunctions or even serious accidents. To ensure the reliable operation of high-voltage electrical equipment throughout its service life, the temperature of each material during operation must be limited to its maximum permissible temperature rise.

[0003] Temperature rise is a crucial performance indicator for the stable operation of a gas-insulated switchgear. Meeting the required temperature rise is directly related to whether the electrical and mechanical properties of the internal conductors and insulators of the switchgear can meet operational requirements during extended periods of operation.

[0004] Conventional temperature control methods utilize an internal fan within the gas chamber. The fan operates within the chamber, forcing air to circulate and accelerating heat exchange with the outer wall, thus cooling the internal gas. For example, patent CN221380168U employs this method, using a magnetic drive to power the internal fan. While this method overcomes the sealing issues of electrically driven fans, it still suffers from drawbacks such as the inability to replace damaged fans and the inability to control continuous fan operation. CN220510585U, which also uses an internal fan, suffers from the same problem of non-replaceable fans. Fan failure affects the entire operation of the gas chamber.

[0005] Other temperature control methods involve using multiple heat sinks or copper tube integrated gas bags exposed on the outside of the gas chamber, with the internal cavity of the gas bag communicating with the gas inside the chamber. For example, patent number CN212412583U uses this type of gas bag externally placed on the side of the gas chamber, exchanging heat with the gas inside the chamber through the cavity integrated with copper tubes. However, this design relies solely on the narrow space at the contact opening between the gas bag and the gas chamber for heat exchange, which inevitably leads to low conversion efficiency and ineffective performance in scenarios with high current heating. Furthermore, based on the principle that gases rise due to decreasing density when heated, a side-mounted gas bag cannot reliably contact the hottest part of the gas, affecting the actual temperature control effect.

[0006] Therefore, how to provide a heat dissipation device and a gas-filled cabinet that improve the temperature rise performance of high-current gas-filled cabinets is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0007] In view of this, the present invention provides a heat dissipation device and a gas-filled cabinet to improve the temperature rise performance of a high-current gas-filled cabinet. Without affecting the airtightness of the gas-filled cabinet, the damaged fan can be replaced, and at the same time, the temperature rise control effect is high.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: a heat dissipation device for improving the temperature rise performance of a high-current gas-filled cabinet, comprising: a duct heat exchange cavity, the duct heat exchange cavity including a connecting bridge section and expanded area heat exchange sections located at both ends of the connecting bridge section, the connecting bridge section being respectively connected to the expanded area heat exchange sections at both ends, the duct heat exchange cavity having an air inlet formed on the top side corresponding to one expanded area heat exchange section and an air outlet formed on the top side corresponding to the other expanded area heat exchange section, the duct heat exchange cavity having flange seats provided on the periphery of the air inlet and the air outlet, the duct heat exchange cavity being able to be connected to the inner top of the gas-filled cabinet through the flange seats; A fan is detached and installed at the air outlet. The airflow inside the heat exchange chamber of the air duct carries away the heat of the gas inside the gas filling cabinet to control the temperature rise of the gas filling cabinet.

[0009] The beneficial technical effects of this invention are as follows: the heat dissipation device is used in conjunction with the gas cabinet. In specific use, it is sealed and installed at the installation port on the top of the gas cabinet, so that the inside of the gas cabinet is still a closed gas filling environment. The airflow circulation in the air duct cavity will carry away the heat inside the gas cabinet, thereby controlling the temperature rise of the gas cabinet. Since the air duct heat exchange cavity is not connected to the inner cavity of the gas cabinet, the replacement of the fan has no impact on the gas cabinet. Preferably, the connecting corridor bridge section includes multiple parallel channel flat tubes, the cross-section of the channel flat tubes is wavy, and the two ends of the channel flat tubes are connected and communicate with the expanded area heat exchange section on the corresponding side.

[0010] The resulting technical effect is that the flat tube increases the heat exchange area, thereby improving the heat exchange efficiency of the gas inside the gas holder.

[0011] Preferably, the expanded area heat exchange section is a rectangular barrel with an open top, and the expanded area heat exchange section is provided with heat exchange fins on the outer side wall of the rectangular barrel. The connecting bridge section is connected to the side wall of the rectangular barrel of the expanded area heat exchange section at the corresponding end, and the flange seat is provided on the outer edge of the top opening of the rectangular barrel.

[0012] The resulting technical effects are: the expanded heat exchange section can efficiently exchange heat, remove heat from the inside of the gas-filled cabinet, control the temperature rise, and the added heat exchange fins further improve the heat exchange area and heat exchange efficiency.

[0013] Preferably, a fan bracket is provided at the top opening of the rectangular barrel of the expanded area heat exchange section corresponding to the air outlet, and the fan is a duct fan and is detachably connected to the fan bracket.

[0014] The resulting technical effect is that a fan is installed at the air outlet to actively control the airflow, carrying away heat from inside the gas chamber during the flow. The fan mount provides a foundation for the fan's disassembly and installation.

[0015] Preferably, the heat exchange cavity of the air duct is made of aluminum.

[0016] The resulting technical effect is that it can maintain good thermal conductivity and welding consistency.

[0017] The present invention also discloses an air-filled cabinet, which includes the above-mentioned heat dissipation device, air box and mounting plate. The air box has an installation port on its top side. The mounting plate is detachably connected to the installation port. The mounting plate has a flange for mounting the heat dissipation device. The heat dissipation device is located inside the air box and is fixedly connected to the flange.

[0018] The resulting technical effect is that the heat dissipation device is arranged on the top of the inner side of the air box. The gas in the heat-generating area inside the air box expands when heated, and rises, thus exchanging heat with the heat dissipation device to form a circulation. The air box spontaneously forms an up-and-down circulating airflow to participate in heat exchange and control the temperature rise. All related connections are sealed, so it will not affect the replacement of the fan later.

[0019] Preferably, a top plate sealing ring is provided between the contact surface of the mounting base plate and the air box.

[0020] The resulting technical effect is that the top plate sealing ring is directly installed between the mounting plate and the air box, thereby preventing gas leakage at the connection of the mounting plate.

[0021] Preferably, a flange gasket is provided between the contact surface of the heat dissipation device and the mounting plate.

[0022] The resulting technical effect is that a flange gasket is installed at the connection between the heat dissipation device and the mounting plate to prevent air leakage at this point.

[0023] Preferably, the mounting plate is an aluminum plate, and the outer wall of the aluminum plate is provided with a protective paint layer.

[0024] The resulting technical effect is that the mounting plate is made of aluminum and is protected to ensure its service life.

[0025] Preferably, the inside of the gas box is an inflatable and sealed environment. The inside of the gas box is equipped with a conductor. When the conductor is energized, it generates heat and causes the gas in the vicinity of the conductor to expand and become less dense, flowing upward. The gas away from the conductor fills the area and forms a turbulent circulation inside the gas box. The gas circulating to the top exchanges heat with the heat dissipation device to control the temperature rise of the gas box.

[0026] The resulting technical effect is that by installing a heat dissipation device on the top of the air box, airflow circulation can be spontaneously generated inside the air box, thereby using the heat dissipation device to cool down the air and effectively control the temperature rise. Attached Figure Description

[0027] Figure 1 This is a structural diagram of a heat dissipation device for improving the temperature rise performance of a high-current gas-filled cabinet according to the present invention. Figure 2 This is a schematic cross-sectional view of the heat dissipation device for improving the temperature rise performance of a high-current gas-filled cabinet according to the present invention. Figure 3 This is a cross-sectional view of the connecting corridor bridge section of a heat dissipation device for improving the temperature rise performance of a high-current gas-filled cabinet according to the present invention. Figure 4 This is a schematic diagram of an air-filled cabinet structure according to the present invention; Figure 5 This is a schematic diagram showing the connection between the heat dissipation device and the mounting plate of the gas-filled cabinet of the present invention.

[0028] 1. Heat dissipation device, 11. Air duct heat exchange cavity, 111. Connecting corridor bridge section, 112. Expanded area heat exchange section, 113. Air inlet, 114. Air outlet, 115. Flange seat, 116. Heat dissipation fins, 12. Fan, 2. Air box, 3. Mounting base plate, 31. Flange opening, 4. Top plate sealing ring, 5. Flange gasket, 6. Conductor. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] See the appendix of this invention. Figures 1 to 3 According to an embodiment of the present invention, a heat dissipation device for improving the temperature rise performance of a high-current gas-filled cabinet includes: a duct heat exchange cavity 11, the duct heat exchange cavity 11 including a connecting bridge portion 111 and an expanded area heat exchange portion 112 located at both ends of the connecting bridge portion 111. The connecting bridge portion 111 is connected to the expanded area heat exchange portion 112 at both ends. An air inlet 113 is formed on the top side of the duct heat exchange cavity 11 corresponding to one of the expanded area heat exchange portions, and an air outlet 114 is formed on the top side of the other expanded area heat exchange portion. A flange seat 115 is provided on the periphery of the duct heat exchange cavity 11 corresponding to the air inlet 113 and the air outlet 114. The duct heat exchange cavity 11 can be connected to the inner top of the gas-filled cabinet through the flange seat. There are two fans 12, which are detached and installed at the air outlet 114. The airflow inside the heat exchange chamber 11 carries away the heat of the gas inside the gas chamber to control the temperature rise of the gas chamber. In other embodiments, the connecting bridge section 111 includes multiple parallel channel flat tubes with a corrugated cross-section to increase the heat exchange area. The two ends of the channel flat tubes are connected and communicate with the expanded area heat exchange section 112 on the corresponding side.

[0031] In some other specific embodiments, the expanded area heat exchange section 112 is a rectangular barrel with an open top. The outer wall of the expanded area heat exchange section 112 is provided with heat exchange fins 116. The connecting bridge section 111 is connected to the side wall of the rectangular barrel of the expanded area heat exchange section at the corresponding end. The flange seat 115 is provided at the outer edge of the top opening of the rectangular barrel.

[0032] In other embodiments, a fan mount is provided at the top opening of the rectangular barrel of the expanded area heat exchange section 112 corresponding to the air outlet, and the fan 12 is a duct fan and is detachably connected to the fan mount.

[0033] In some other embodiments, the heat exchange chamber 11 of the air duct is made of aluminum.

[0034] The main body of the heat dissipation device is formed by welding aluminum plates. It must undergo appropriate weld inspection methods and water seepage tests to ensure that the welds are free of cracks and leaks.

[0035] The flange seat facilitates subsequent connection to the gas box. A sealing ring mounting groove is specifically designed, and the sealing ring is tightened with bolts to achieve a sealing effect at the surface contact point. Ultimately, this ensures a complete seal within the gas box.

[0036] The fan can be directly replaced from the outside of the air box at the air outlet where the heat dissipation device of the fan is installed.

[0037] Reference Appendix Figure 4-5 The present invention discloses an air-filled cabinet, which includes the above-mentioned heat dissipation device 1, air box 2 and mounting plate 3. The top side of the air box 2 is provided with an installation port, and the mounting plate 3 is detachably connected to the installation port. The mounting plate 3 is provided with a flange 31 for mounting the heat dissipation device 1. The heat dissipation device 1 is located inside the air box 2 and is fixedly connected to the flange 31.

[0038] In other embodiments, a top plate sealing ring 4 is provided between the contact surfaces of the mounting base plate 3 and the air box 2.

[0039] Specifically, a flange gasket 5 is provided between the flange seat 115 of the heat dissipation device 1 and the contact surface of the mounting plate 3 to achieve gap sealing.

[0040] More specifically, the mounting plate 3 is made of aluminum plate, and the outer wall of the aluminum plate is provided with a protective paint layer. After the heat exchange cavity of the air duct is formed, it also needs to be sprayed with black paint for protection.

[0041] The interior of the gas chamber 2 is a sealed, inflated environment. Inside the gas chamber 2, there is a conductor 6. When the conductor 6 is energized, it heats up and causes the gas in the vicinity of the conductor to expand and become less dense, flowing upward. The gas away from the conductor fills the area and forms a turbulent circulation inside the gas chamber. The gas circulating to the top exchanges heat with the heat dissipation device 1 to control the temperature rise of the gas chamber.

[0042] Work process: When the gas-filled cabinet is powered on, the primary conductor inside the gas chamber continuously generates heat due to the flow of current. During stable operation, the primary conductor, through auxiliary measures such as adding heat sinks or blackening the conductor, further accelerates its heat dissipation efficiency. The heat is first transferred to the portion of gas adjacent to the primary conductor via thermal conduction. This heated gas expands in volume, decreases in density, and flows upwards. Other gas not adjacent to the conductor, being less heated and denser, fills this area. This incoming gas absorbs heat and flows upwards, creating a continuous circulation. This circulation carries away the heat generated by the conductor. Without a cooling system, the gas temperature inside the chamber will gradually rise. As the gas temperature rises, the temperature difference between different parts of the chamber becomes small, reducing the efficiency of natural convection heat transfer.

[0043] The heat dissipation device of this invention is built into the top of the air box. The main body of the heat dissipation device can directly contact and absorb the heat of the gas inside the air box, thereby reducing the temperature of the gas near the heat dissipation device. Due to the internal airflow circulation, the entire interior of the air box is cooled down.

[0044] The airtightness of the heat dissipation device throughout the process ensures the stable operation of the inflation equipment, and because the fan is externally located at the air outlet, replacing the fan does not require shutting down the inflation cabinet.

[0045] This device can serve as an auxiliary measure for heat exchange between the gas box and the outside of the entire high-current gas-filled cabinet, thereby reducing the temperature of the gas inside the gas box.

[0046] Gas-filled cabinets typically contain environmentally friendly gases or SF6 gas, and their installation requires meeting sealing requirements. Gas-filled cabinets generally have fixed size limitations, necessitating maximizing the heat exchange area within a limited space. Forced cooling with fans is employed, and the fans must be replaceable without shutting down the gas-filled cabinet.

[0047] This invention utilizes a heat dissipation device for direct heat exchange within the cabinet and a forced convection fan within the cavity to accelerate the heat exchange between the air inside the cabinet and the outside, thereby achieving the goal of reducing the temperature of the gas inside the air box.

[0048] With its simple structure and easy installation, good sealing performance, and ability to replace the blower without stopping the gas cabinet equipment, the built-in device effectively saves space in the cabinet.

[0049] The apparatus and methods disclosed in the embodiments are described simply because they correspond to the methods disclosed in the embodiments. For relevant details, please refer to the method section.

[0050] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A heat dissipation device for improving the temperature rise performance of a high-current gas-filled switchgear, characterized in that, include: The air duct heat exchange cavity (11) includes a connecting bridge section (111) and an expanded area heat exchange section (112) located at both ends of the connecting bridge section (111). The connecting bridge section (111) is connected to the expanded area heat exchange section (112) at both ends. The air duct heat exchange cavity (11) has an air inlet (113) on the top side corresponding to one expanded area heat exchange section and an air outlet (114) on the top side corresponding to the other expanded area heat exchange section. The air duct heat exchange cavity (11) is provided with flange seats (115) on the periphery of the air inlet (113) and the air outlet (114). The air duct heat exchange cavity (11) can be connected to the inner top of the gas filling cabinet through the flange seats. The fan (12) is disassembled and installed at the air outlet (114). The airflow inside the air duct heat exchange chamber (11) carries away the heat of the gas inside the gas filling cabinet to control the temperature rise of the gas filling cabinet.

2. The heat dissipation device for improving the temperature rise performance of a high-current gas-filled switchgear according to claim 1, characterized in that, The connecting corridor bridge section (111) includes multiple parallel channel flat tubes with a wavy cross section. The two ends of the channel flat tubes are connected and communicate with the expanded area heat exchange section (112) on the corresponding side.

3. The heat dissipation device for improving the temperature rise performance of a high-current gas-filled switchgear according to claim 1, characterized in that, The expanded area heat exchange section (112) is a rectangular barrel with an open top. The expanded area heat exchange section (112) is provided with heat exchange fins (116) on the outer side wall of the rectangular barrel. The connecting bridge section (111) is connected to the side wall of the rectangular barrel of the expanded area heat exchange section at the corresponding end. The flange seat (115) is located on the outer edge of the top opening of the rectangular barrel.

4. A heat dissipation device for improving the temperature rise performance of a high-current gas-filled switchgear according to claim 3, characterized in that, A fan mount is provided at the top opening of the rectangular barrel of the expanded area heat exchange section (112) corresponding to the air outlet. The fan (12) is a duct fan and is detachably connected to the fan mount.

5. A heat dissipation device for improving the temperature rise performance of a high-current gas-filled switchgear according to claim 1, characterized in that, The heat exchange cavity (11) of the air duct is made of aluminum.

6. An inflatable cabinet, characterized in that, The device includes a heat dissipation device (1), an air box (2), and a mounting plate (3) as described in any one of claims 1-5. The air box (2) has an installation port on its top side. The mounting plate (3) is detachably connected to the installation port. The mounting plate (3) has a flange (31) for mounting the heat dissipation device (1). The heat dissipation device (1) is located inside the air box (2) and is fixedly connected to the flange (31).

7. The gas-insulated cabinet according to claim 6, characterized in that, A top plate sealing ring (4) is provided between the contact surface of the mounting base plate (3) and the air box (2).

8. A gas-filled cabinet according to claim 6, characterized in that, A flange gasket (5) is provided between the contact surface of the heat dissipation device (1) and the mounting plate (3).

9. A gas-filled cabinet according to claim 6, characterized in that, The mounting base plate (3) is an aluminum plate, and the outer side wall of the aluminum plate is provided with a protective paint layer.

10. A gas-insulated cabinet according to claim 6, characterized in that, The gas box (2) is an air-filled sealed environment. The gas box (2) is equipped with a conductor (6). The conductor (6) is energized and heats up, causing the gas in the vicinity of the conductor to expand and become less dense, flowing upward. The gas away from the conductor fills the area and forms a turbulent circulation inside the gas box. The gas circulating to the top exchanges heat with the heat dissipation device (1) to control the temperature rise of the gas box.

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