Natural heat dissipation system for high-current switchgear based on heat pipe technology

Abstract

The present invention belongs to the technical field of heat dissipation of switchgear, and particularly relates to a natural heat dissipation system for high-current switchgear based on heat pipe technology. A busbar chamber, a circuit breaker chamber, a cable chamber and an instrument chamber are provided inside the switchgear body, and multiple groups of temperature sensors, multiple groups of humidity sensors and multiple groups of smoke sensors are also provided; heat absorption components are respectively provided in the busbar chamber, the circuit breaker chamber and the cable chamber, and contact boxes are respectively connected in the busbar chamber and the cable chamber; one end of a group of contact boxes is connected to the vacuum circuit breaker inside the circuit breaker chamber, the other end is connected to the branch busbar, and the other end of the branch busbar is connected to the main busbar on the busbar chamber; the other group of contact boxes is connected to the input end of the current transformer, and the output end of the current transformer is respectively connected to the earthing switch, the potential transformer, the lightning arrester and the cable joint end through busbars; a radiator is provided at the top of the switchgear body. The present invention can realize the natural cooling of the switchgear and the on-line detection of the temperature rise of the switchgear, and improve the intelligent level of the heat dissipation system.

Description

Technical Field

[0001] The invention belongs to the technical field of switch cabinet heat dissipation, and particularly relates to a natural heat dissipation system for a high-current switch cabinet based on heat pipe technology. Background Art

[0002] With the continuous expansion of urban space, the rapid development of power load, the increasing load density, the gradual increase of the capacity of a single main transformer in a substation, the planned capacity of the 110 kV main transformer in Class B and above power supply areas is mainly 50 MVA, and the rated current of the 10 kV incoming line cabinet is as high as 2887 A. In China, the 12 kV switch cabinet basically adopts the KYN series metal withdrawable enclosed switchgear. The biggest bottleneck of this equipment is the rated current. During the peak summer period, the heat generation problem of the switch cabinet is very serious. Among the accidents that occur in the substation switch cabinet, 55% occur in the high-current incoming line cabinet and the tie cabinet, and the reason is that the temperature rise inside the cabinet is too high, leading to switch cabinet accidents. Taking the KYN28-12 switch cabinet as an example, the cooling system uses forced air cooling to ensure the temperature rise requirement of the switch cabinet. Forced air cooling has an additional accident source, that is, once the fan fails, the temperature inside the switch cabinet will rise sharply. First of all, the moving plug spring in the contact box becomes soft at high temperature, the contact pressure drops, the temperature rises, and arcing occurs, ultimately causing the contact box to burn out, phase-to-phase short circuit, and switch cabinet explosion. Even worse, one explosion quickly spreads to other surrounding switch cabinets and other equipment, triggering a chain explosion. In addition, the long-term high-temperature operation of the switch cabinet accelerates the aging speed of the insulating parts, reduces the service life of the switch cabinet, and ultimately leads to sudden accidents. It is estimated that the direct economic loss caused by each such accident exceeds 600,000 yuan, and the social negative impact brought is immeasurable. The switch cabinet explosion and injury incident that occurred in Guangzhou in 2012 caused great economic losses and serious social impacts. The overheating of the switch cabinet has become an urgent problem to be solved in the power transmission and transformation industry. Summary of the Invention

[0003] In view of the deficiencies existing in the above-mentioned prior art, the invention provides a natural heat dissipation system for a high-current switch cabinet based on heat pipe technology. Its purpose is to achieve the invention purpose of solving the problems of long-term low-temperature operation of the switch cabinet without forced air cooling by a fan and reducing the load heat of the moving contact spring.

[0004] The technical solution adopted by the invention to achieve the above purpose is:

[0005] The natural heat dissipation system of a high-current switchgear based on heat pipe technology includes the switchgear body. Inside the switchgear body, there are a busbar chamber, a circuit breaker chamber, a cable chamber, and an instrument chamber. There are also multiple groups of temperature sensors, multiple groups of humidity sensors, and multiple groups of smoke sensors inside the switchgear body. Heat absorption components are respectively arranged on the rear side plates of the busbar chamber, the circuit breaker chamber, and the cable chamber. Contact boxes are respectively connected to the front side plates of the busbar chamber and the cable chamber. One end of a group of contact boxes is connected to the vacuum circuit breaker inside the circuit breaker chamber, the other end of the contact box is connected to the branch busbar, and the other end of the branch busbar is connected to the main busbar on the busbar chamber. The other group of contact boxes is connected to the input end of the current transformer, and the output end of the current transformer is respectively connected to the earthing switch, the voltage transformer, the lightning arrester, and the cable joint end through the busbar. On one side of the top of the switchgear body, a second radiator is arranged, and the bottom of the second radiator is connected to a second heat pipe. The heat absorption end of the second heat pipe penetrates through the top of the switchgear body and extends into the interior of the instrument chamber.

[0006] Further, the heat absorption component includes a substrate and a first heat pipe arranged on the substrate.

[0007] Further, the inlet end of the contact box corresponds to the position of the moving contact connected to one end of the conductive rod of the vacuum circuit breaker inside the circuit breaker chamber. Two groups of third heat pipes are embedded in the outer wall of the contact box, and one end of each of the two groups of third heat pipes extends into the interior of the contact box, and the other ends of the two groups of third heat pipes are wound around the outer wall of the contact box. An arc-shaped groove is formed on the outer wall of the contact box, and a heat dissipation rack is installed closely fitting the outer surface of the third heat pipe above the arc-shaped groove. Both ends of the heat dissipation rack are fixedly connected to both sides of the arc-shaped groove, and heat dissipation fins are arranged on the top of the heat dissipation rack.

[0008] A fixing plate is longitudinally arranged inside the contact box in line with the inner side wall. A static contact is horizontally penetrated through the center of the fixing plate, and the static contact is fixed inside the contact box through the fixing plate. One end of the static contact is fixedly connected to the corresponding branch busbar, and the other end of the static contact is clamped with the moving contact on the vacuum circuit breaker. The other end of the branch busbar extends out through the outlet of the contact box and is connected to the corresponding main busbar inside the busbar chamber.

[0009] The outer shell of the contact box can be made of epoxy resin, and the heat dissipation rack is made of an insulating heat conducting sheet with strong heat conductivity.

[0010] Further, the multiple groups of temperature sensors are passive wireless temperature sensors, and the multiple groups of temperature sensors are respectively arranged on the inner side plates of the switchgear and the high-voltage contact points.

[0011] Furthermore, the moving contact is a cylindrical body, inside which there are multiple rib strips arranged longitudinally. Both ends of the rib strips are arc-shaped and bent outward. Multiple groups of springs are equidistantly distributed on the outer wall of the rib strips, and spring seats are provided at both ends of the springs; one end of the spring is fixedly connected to the rib strip through the spring seat, and the other end of the spring is fixedly connected to the insulating layer through the spring seat; a metal shell is adhesively attached to the outer periphery of the insulating layer, and the insulating layer is made of epoxy resin or rubber.

[0012] Furthermore, a plurality of arc-shaped card slots are equidistantly arranged on the outer periphery of the conductive rod, and arc-shaped clamping blocks matching the arc-shaped card slots are arranged on the inner side wall of the rib strip. The moving contact is fixedly clamped on the outer periphery of the conductive rod through the plurality of arc-shaped clamping blocks and the corresponding arc-shaped card slots.

[0013] Furthermore, main busbars are provided on the side plate of the busbar chamber. The main busbars are divided into three phases A, B, and C. There are bushing insulators between their outer peripheries and the switchgear body. One ends of the three-phase main busbars A, B, and C are respectively connected to one ends of the corresponding branch busbars. The other ends of the three groups of branch busbars are respectively connected to the static contacts inside three contact boxes horizontally arranged on the front side plate of the busbar chamber; the branch busbars penetrate into the contact boxes through the outlet openings and are connected to one ends of the static contacts.

[0014] Furthermore, one end of the first heat pipe on the heat absorption component in the circuit breaker chamber penetrates through the rear side plate and extends into the busbar chamber, and is connected to the third radiator on the front side plate of the busbar chamber; one end of the first heat pipe on the heat absorption component in the busbar chamber penetrates through the rear side plate and extends into the cable chamber, and penetrates through the top of the cable chamber and is connected to the first radiator; one end of the first heat pipe on the heat absorption component in the cable chamber penetrates through the top of the cable chamber and is connected to the first radiator; the first radiator is arranged on the top of the switchgear body.

[0015] Furthermore, the first heat pipe, the second heat pipe, and the third heat pipe are all made of hollow metal tubes, and a coolant is provided inside them; the surfaces of the substrate, the first heat pipe, the second heat pipe, the third heat pipe, the third radiator, and the heat dissipation rack are all coated with thermally conductive insulating paint.

[0016] Furthermore, a relay, a terminal block, and a communication module are provided in the instrument chamber. The wireless communication module is connected to the controller, and an antenna perforation is provided on the top of the instrument chamber.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] The present invention adopts the heat pipe technology to absorb the heat inside the switchgear through the phase change heat transfer principle and dissipate the heat through the radiator, enabling it to operate at a low temperature for a long time without forced air cooling by a fan in the switchgear, realizing natural cooling of the switchgear.

[0019] The present invention improves the contact box by embedding heat pipes in the static and moving contact areas respectively, and fixing and winding the heat pipes with heat dissipation frames sleeved on the other ends around the outer wall of the contact box, so as to quickly dissipate the temperature inside the contact box and avoid damage caused by excessive temperature inside the contact box;

[0020] The present invention improves the structure of the moving contact, avoids large current passing through the spring around the moving contact, reduces the heat load of the moving contact spring, and improves the service life of the spring;

[0021] The present invention realizes the on-line detection of the temperature rise of the switch cabinet by arranging temperature sensors, humidity sensors, smoke sensors and wireless communication modules in the switch cabinet, and conducts remote monitoring and automatic recording, thereby improving the intelligent level of the heat dissipation system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0023] Figure 1 is a schematic diagram of the internal structure of the switch cabinet of the present invention;

[0024] Figure 2 is a schematic diagram of the structure of the heat absorption component of the present invention;

[0025] Figure 3 is a schematic diagram of the technical principle of the heat pipe of the present invention;

[0026] Figure 4 is a schematic cross-sectional structure diagram of the contact box of the present invention;

[0027] Figure 5 is a schematic diagram of the structure of the heat dissipation frame on the contact box of the present invention;

[0028] Figure 6 is a schematic cross-sectional structure diagram of the moving contact of the present invention;

[0029] Figure 7 is a schematic side cross-sectional structure diagram of the moving contact of the present invention;

[0030] Figure 8 is a schematic block diagram of the on-line monitoring principle of the switch cabinet of the present invention.

[0031] In the figure:

[0032] Switchgear body 1, busbar chamber 2, circuit breaker chamber 3, instrument chamber 4, cable chamber 5, contact box 6, penetration hole 61, arc groove 62, fixing plate 63, outlet 64, inlet end 65, vacuum circuit breaker 7, branch busbar 8, current transformer 9, earthing switch 10, heat absorption component 11, first heat pipe 12, first radiator 13, second radiator 14, second heat pipe 15, third radiator 16, third heat pipe 17, heat dissipation rack 18, heat dissipation fin 181, static contact 19, moving contact 20, metal layer 2001, insulating layer 2002, spring seat 2003, spring 2004, rib 2005, arc-shaped clamping block 2006, conducting rod 21, arc-shaped clamping groove 211, heating element 22, heat pipe 23. Detailed implementation manners

[0033] In order to more clearly understand the above objects, features and advantages of the present invention, the present invention will be further described in detail below in conjunction with the drawings and specific implementation manners. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

[0034] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0035] The following refers to Figures 1 - 8 Describe the technical solutions of some embodiments of the present invention.

[0036] Embodiment 1

[0037] The present invention provides a technical solution, which is a natural heat dissipation system for a large-current switchgear based on heat pipe technology. As Figure 1 shown, Figure 1 is a schematic diagram of the internal structure of the switchgear of the present invention.

[0038] The present invention includes a switchgear cabinet body 1. Inside the switchgear cabinet body 1, there are a busbar chamber 2, a circuit breaker chamber 3, a cable chamber 5, and an instrument chamber 4. Inside the switchgear cabinet body 1, there are also multiple groups of temperature sensors, multiple groups of humidity sensors, and multiple groups of smoke sensors; on the rear side plates of the busbar chamber 2, the circuit breaker chamber 3, and the cable chamber 5, heat absorption components 11 are respectively provided. On the front side plates of the busbar chamber 2 and the cable chamber 5, two groups of contact boxes 6 are also connected; one end of the contact box 6 on the busbar chamber 2 is connected to the vacuum circuit breaker 7 inside the circuit breaker chamber 3, the other end of the contact box 6 is connected to the branch busbar 8, and the other end of the branch busbar 8 is connected to the main busbar on the busbar chamber 2; the busbar ends of the outlet 64 of the contact box 6 on the other group of cable chambers 5 are respectively connected to the input contacts of the current transformers 9, and the output contacts of the current transformers 9 are respectively connected to the earthing switch 10, the voltage transformer, the lightning arrester, and the cable joint end through busbars; on one side of the top of the switchgear cabinet body 1, a second radiator 14 is provided. The bottom of the second radiator 14 is connected with a second heat pipe 15, and the heat absorption end of the second heat pipe 15 penetrates through the top of the switchgear cabinet body 1 and extends into the interior of the instrument chamber 4.

[0039] Among them, the heat pipes installed on the heat absorption component 11 in the present invention are the same, except that the heat absorption areas of the heat pipes arranged in different regions are different.

[0040] Embodiment 2

[0041] The present invention also provides a technical solution, which is a natural heat dissipation system for a large-current switchgear based on heat pipe technology. It includes a switchgear cabinet body 1, and multiple groups of temperature sensors, multiple groups of humidity sensors, and multiple groups of smoke sensors arranged inside the switchgear cabinet body 1. Multiple groups of heat absorption components 11 are arranged inside the switchgear cabinet body 1. The heat absorption components 11 are respectively fixedly connected to the rear side plates of the switchgear busbar chamber 2, the circuit breaker chamber 3, and the cable chamber 5 by screws. The heat absorption component 11 includes a substrate and a first heat pipe 12 arranged on the substrate. As Figure 2 shown, Figure 2 is a schematic structural diagram of the heat absorption component of the present invention.

[0042] Figure 1 Among them, on the right side of the top of the switchgear cabinet body 1, a second radiator 14 is provided. The bottom of the second radiator 14 is connected with multiple second heat pipes 15 in a clamping manner. The heat absorption ends of the second heat pipes 15 penetrate through the top of the switchgear cabinet body 1 and extend into the interior of the instrument chamber 4.

[0043] Figure 1 Among them, two groups of contact boxes 6 are also arranged inside the switchgear cabinet body 1. The two groups of contact boxes 6 are respectively fixedly connected to the front side plates of the busbar chamber 2 and the cable chamber 5 by screws, and the inlet end 65 of the contact box 6 corresponds to the position of the moving contact 20 connected to one end of the conducting rod 21 of the vacuum circuit breaker 7 inside the circuit breaker chamber 3;

[0044] AsFigure 4 and Figure 5 as shown Figure 4 is a schematic cross-sectional structure diagram of the contact box of the present invention Figure 5 is a schematic structure diagram of the heat dissipation rack on the contact box of the present invention. Two groups of third heat pipes 17 are embedded in the outer wall of the contact box 6, and one end of each of the two groups of third heat pipes 17 extends into the interior of the contact box 6, and the other end is wound around the outer wall of the contact box 6; an arc-shaped groove 62 is formed in the outer wall of the contact box 6 near the third heat pipe 17, above the arc-shaped groove 62, and a heat dissipation rack 18 is installed in close contact with the outer surface of the third heat pipe 17. Both ends of the heat dissipation rack 18 are fixedly connected to both sides of the arc-shaped groove 62, and a heat dissipation fin 181 is fixedly connected to the top of the heat dissipation rack 18 by screws. The heat dissipation rack 18 is made of an insulating heat-conducting sheet with strong heat-conducting performance. By closely fitting with the cooling end of the heat pipe, the heat inside the contact box 6 can be quickly discharged, avoiding damage to the contact box 6 caused by high temperature. The outer shell of the contact box 6 can be made of epoxy resin

[0045] As Figure 6 and Figure 7 shown Figure 6 is a schematic cross-sectional structure diagram of the moving contact of the present invention Figure 7 is a schematic side cross-sectional structure diagram of the moving contact of the present invention. The moving contact 20 is a cylindrical body, and a plurality of rib strips 2005 are longitudinally arranged inside it, and both ends of the rib strips 2005 are arc-shaped and bent outward. A plurality of groups of springs 2004 are equidistantly distributed on the outer wall of the rib strips 2005. Both ends of the springs 2004 are welded with spring seats 2003. One end of the spring 2004 is welded and connected to the rib strip 2005 through the spring seat 2003, and the other end of the spring 2004 is fixedly connected to the insulating layer 2002 through the spring seat 2003 by an adhesive method. A metal shell 2001 is adhesively bonded to the outer periphery of the insulating layer 2002. The insulating layer 2002 can be made of epoxy resin or rubber

[0046] The purpose of setting the insulating layer 2002 here is to short-circuit the spring branch. When the moving and static contacts are clamped, the spring not only plays a role in stretching and fixing the clamping, but also avoids the increase of spring heat caused by the passage of large current. Since the spring is easy to soften at high temperature, the contact pressure decreases, the temperature rises, and a fire occurs, ultimately leading to the burning of the contact box, phase-to-phase short circuit, and explosion of the switch cabinet. In the prior art, since the spring is wound around both ends of the outer side wall of the moving contact to clamp and fix the moving and static contacts, it cannot avoid the passage of large current, increasing the load heat of the spring and reducing the life of the spring after long-term use

[0047] As Figure 6, a plurality of arc-shaped card slots 211 are arranged at equal intervals on the outer periphery of the conductive rod 21, and arc-shaped clamping blocks 2006 matching the arc-shaped card slots 211 are arranged on the inner side wall of the rib 2005. The moving contact 20 is fixedly clamped to the outer periphery of the conductive rod 21 through the plurality of arc-shaped clamping blocks 2006 and the corresponding arc-shaped card slots 211.

[0048] As Figure 4 shown, a fixing plate 63 is longitudinally arranged on the inner side wall of the inner fitting of the contact box 6. A static contact 19 penetrates horizontally through the center of the fixing plate 63. The static contact 19 is fixed inside the contact box 6 through the fixing plate 63; one end of the static contact 19 is fixedly connected to the corresponding branch busbar 8, and the other end of the static contact 19 is clamped with the moving contact 20 on the vacuum circuit breaker 7; the other end of the branch busbar 8 extends out through the outlet 64 on the contact box 6 and is connected to the corresponding main busbar inside the busbar chamber 2; the main busbar is divided into three phases A, B, and C and is respectively arranged on the side plates of the busbar chamber 2. A wall bushing is provided between its outer periphery and the switch cabinet body 1. The three-phase main busbars A, B, and C are respectively connected to one end of the corresponding branch busbars 8. The other ends of the three groups of branch busbars are respectively connected to the static contacts 19 inside the three contact boxes 6 horizontally arranged on the front side plate of the busbar chamber 2. The branch busbar 8 penetrates into the contact box 6 through the outlet 64 and is fixed to one end of the static contact 19 by screws.

[0049] As Figure 3 shown, Figure 3 is a schematic diagram of the heat pipe technology principle of the present invention, where: Q = KAΔT, Q is the heat transfer amount of the heat source; A is the heat dissipation area; t1 and t2 are the heat source temperature and the ambient temperature respectively; ΔT = t2 - t1; K is the heat transfer coefficient, and its magnitude is proportional to the air flow velocity; v is the air flow velocity. Figure 3 The heat pipe principle in [reference] is prior art and will not be described in detail here.

[0050] The heat absorption component 11 inside the switch cabinet adopts heat pipe technology and transfers heat through high-temperature phase change. Since its heat transfer driving force is the temperature difference, as long as the temperature difference exists, heat will be continuously transported without any auxiliary power. The heat pipe 23, as a heat superconductor, selects a hollow metal tube body with a coolant inside. The heating end is close to the heat source, that is, the place of the heating body 22, and can quickly absorb the heat around the heating body 22 to achieve the purpose of rapid cooling. Although heat pipe technology has achieved remarkable results in other fields, currently, the power switch cabinet manufacturers mainly still adopt the traditional fan refrigeration method for heat dissipation. Therefore, it is very necessary to apply heat pipe technology to the high-current switch cabinets in the power industry.

[0051] In this solution, the large-current switchgear can achieve natural air cooling by using heat pipes for heat dissipation, which greatly improves the safety performance of the switchgear, thus reducing the incidence of safety accidents during substation operation and maintenance, avoiding casualties and property losses of personnel, being conducive to improving the level of substation safety management, and having important theoretical significance and practical application value.

[0052] As Figure 1 shown, one end of the first heat pipe 12 on the heat absorption component 11 in the circuit breaker chamber 3 penetrates through the rear side plate and extends into the bus chamber 2, and is connected to the third radiator 16 on the front side plate of the bus chamber 2. One end of the first heat pipe 12 on the heat absorption component 11 in the bus chamber 2 penetrates through the rear side plate and extends into the cable chamber 5, and penetrates through the left top of the cable chamber 5 and is connected to the first radiator 13. One end of the first heat pipe 12 on the heat absorption component 11 in the cable chamber 5 penetrates through the left top of the cable chamber 5 and is connected to the first radiator 13. The first radiator 13 is arranged on the top of the switchgear body 1.

[0053] As Figures 1 - 4 shown, the first heat pipe 12, the second heat pipe 15, and the third heat pipe 17 are all made of hollow metal tubes, and a coolant is provided inside.

[0054] The surfaces of the substrate, the first heat pipe 12, the second heat pipe 15, the third heat pipe 17, the third radiator 16, and the heat dissipation rack 18 are all coated with thermally conductive insulating paint, which is an existing conventional technology and will not be elaborated here.

[0055] As Figure 8 shown, the controller is installed in the instrument chamber 4. Mainly installed in the instrument chamber 4 are devices such as relays and terminal blocks. An antenna perforation is provided at the top of the instrument chamber 4. The wireless communication module is arranged in the instrument chamber for easy connection to the controller. The wireless communication module and the controller are connected by wire. Multiple groups of humidity sensors and multiple groups of smoke sensors are respectively arranged on the top plates or side plates of the bus chamber 2, the circuit breaker chamber 3, the instrument chamber 4, and the cable chamber 5 of the switchgear body 1 for easy monitoring of the humidity and smoke inside the switchgear. The multiple groups of temperature sensors are passive wireless temperature sensors and are respectively arranged on the inner side plates and high-voltage contact points of the switchgear. This temperature sensor is small in size, has wireless data transmission with the collector, is convenient to install flexibly, is not affected by the equipment structure and space, and does not require the use of batteries, being convenient for maintenance. The multiple groups of temperature sensors, multiple groups of humidity sensors, multiple groups of smoke sensors, the collector, and the wireless communication module in the solution are all existing mature technologies and will not be elaborated here. The mobile terminal is a mobile phone, which is convenient for maintenance personnel to obtain the operating status of the monitored switchgear in a timely manner.

[0056] In the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "connected" and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] In the description of the present invention, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present invention.

[0058] In the description of this specification, the descriptions of the terms "one embodiment", "some embodiments", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0059] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A natural heat dissipation system for a high-current switch cabinet based on heat pipe technology, comprising a switch cabinet body (1), characterized in that: Inside the switchgear body (1), there are a busbar chamber (2), a circuit breaker chamber (3), a cable chamber (5) and an instrument chamber (4). There are also multiple groups of temperature sensors, multiple groups of humidity sensors and multiple groups of smoke sensors inside the switchgear body (1). Heat absorption components (11) are respectively arranged on the rear side plates of the busbar chamber (2), the circuit breaker chamber (3) and the cable chamber (5). Contact boxes (6) are respectively connected to the front side plates of the busbar chamber (2) and the cable chamber (5). One end of a group of contact boxes (6) is connected to the vacuum circuit breaker (7) inside the circuit breaker chamber (3), and the other end of the contact box (6) is connected to the branch busbar (8). The other end of the branch busbar (8) is connected to the main busbar on the busbar chamber (2). The other group of contact boxes (6) is connected to the input end of the current transformer (9). The output end of the current transformer (9) is connected to the earthing switch (10), the voltage transformer, the lightning arrester and the cable joint end respectively through busbars. On one side of the top of the switchgear body (1), there is a second radiator (14). The bottom of the second radiator (14) is connected to a second heat pipe (15). The heat absorption end of the second heat pipe (15) penetrates through the top of the switchgear body (1) and extends into the interior of the instrument chamber (4). The heat absorption component (11) includes a substrate and the first heat pipes arranged on the substrate. The inlet end (65) of the contact box (6) corresponds to the position of the moving contact (20) connected to one end of the conducting rod (21) of the vacuum circuit breaker (7) inside the circuit breaker chamber (3). Two groups of third heat pipes (17) are embedded in the outer wall of the contact box (6), and one end of each of the two groups of third heat pipes (17) extends into the interior of the contact box (6). The other ends of the two groups of third heat pipes (17) are wound around the outer wall of the contact box (6). An arc-shaped groove (62) is formed in the outer wall of the contact box (6). A heat dissipation rack (18) is installed closely against the outer surface of the third heat pipe (17) above the arc-shaped groove (62). The two ends of the heat dissipation rack (18) are fixedly connected to both sides of the arc-shaped groove (62), and heat dissipation fins (181) are arranged on the top of the heat dissipation rack (18). A fixing plate (63) is longitudinally arranged inside the contact box (6) in a fitting manner against the inner side wall. A static contact (19) penetrates horizontally through the center of the fixing plate (63). The static contact (19) is fixed inside the contact box (6) through the fixing plate (63). One end of the static contact (19) is fixedly connected to the corresponding branch busbar (8), and the other end of the static contact (19) is clamped with the moving contact (20) on the vacuum circuit breaker (7). The other end of the branch busbar (8) extends out through the outlet (64) on the contact box (6) and is connected to the corresponding main busbar inside the busbar chamber (2). The outer shell of the contact box (6) is made of epoxy resin, and the heat dissipation rack (18) is made of an insulating heat conducting sheet with strong heat conductivity. The multiple groups of temperature sensors are passive wireless temperature sensors, and the multiple groups of temperature sensors are respectively arranged on the inner side plates of the switchgear and the high-voltage contact points.

2. The natural heat dissipation system for high-current switch cabinets based on heat pipe technology according to claim 1, wherein: The moving contact (20) is a cylindrical body, and a plurality of rib strips (2005) are longitudinally arranged inside it. Both ends of the rib strips (2005) are arc-shaped and bent outward. A plurality of groups of springs (2004) are equidistantly distributed on the outer wall of the rib strips (2005), and spring seats (2003) are arranged at both ends of the springs (2004); one end of the spring (2004) is fixedly connected to the rib strip (2005) through the spring seat (2003), and the other end of the spring (2004) is fixedly connected to the insulating layer (2002) through the spring seat (2003).

3. The natural heat dissipation system for high-current switchgear based on heat pipe technology according to claim 2, wherein: A metal shell (2001) is adhesively bonded to the outer periphery of the insulating layer (2002).

4. The natural heat dissipation system for high-current switchgear based on heat pipe technology according to claim 2, characterized in that: The insulating layer (2002) is made of epoxy resin or rubber.

5. The natural heat dissipation system for high-current switchgear based on heat pipe technology according to claim 2, wherein: One end of the spring (2004) being fixedly connected to the rib strip (2005) through the spring seat (2003) means being fixedly connected by welding.

6. The natural heat dissipation system for high-current switch cabinets based on heat pipe technology according to claim 2, characterized in that: The other end of the spring (2004) being fixedly connected to the insulating layer (2002) through the spring seat (2003) means being fixedly connected by adhesive bonding.

7. The natural heat dissipation system for high-current switch cabinets based on heat pipe technology according to claim 1, wherein: A plurality of arc-shaped clamping grooves (211) are equidistantly arranged on the outer periphery of the conductive rod (21), and arc-shaped clamping blocks (2006) matching the arc-shaped clamping grooves (211) are arranged on the inner side wall of the rib (2005). The moving contact (20) is fixedly clamped on the outer periphery of the conductive rod (21) through the plurality of arc-shaped clamping blocks (2006) and the corresponding arc-shaped clamping grooves (211); a main busbar is arranged on the side plate of the busbar chamber (2). The main busbar is divided into three phases A, B, and C. A wall bushing is arranged between its outer periphery and the switch cabinet body (1). The three-phase main busbars A, B, and C are respectively connected to one ends of the corresponding branch busbars (8). The other ends of the three groups of branch busbars are respectively connected to the static contacts (19) inside three contact boxes (6) horizontally arranged on the front side plate of the busbar chamber (2); the branch busbar (8) penetrates into the contact box (6) through the outlet (64) and is connected to one end of the static contact (19); one end of the first heat pipe (12) on the heat absorption component (11) in the circuit breaker chamber (3) penetrates through the rear side plate and extends into the busbar chamber (2), and is connected to the third radiator (16) on the front side plate of the busbar chamber (2); one end of the first heat pipe (12) on the heat absorption component (11) in the busbar chamber (2) penetrates through the rear side plate and extends into the cable chamber (5), and penetrates through the top of the cable chamber (5) and is connected to the first radiator (13); one end of the first heat pipe (12) on the heat absorption component (11) in the cable chamber (5) penetrates through the top of the cable chamber (5) and is connected to the first radiator (13); the first radiator (13) is arranged on the top of the switch cabinet body (1); the first heat pipe (12), the second heat pipe (15), and the third heat pipe (17) are all made of hollow metal tubes, and a coolant is arranged inside; the surfaces of the substrate, the first heat pipe (12), the second heat pipe (15), the third heat pipe (17), the third radiator (16), and the heat dissipation frame (18) are all coated with heat-conducting insulating paint; a relay, a terminal block, and a communication module are arranged in the instrument chamber (4). The wireless communication module is connected to the controller. An antenna perforation is arranged on the top of the instrument chamber (4).

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