High-stability power distribution cabinet for building electrical system

Abstract

The invention relates to a high-stability power distribution cabinet for a building electrical system applied to the field of power distribution cabinets, and through the arrangement of a gap-variable heat dissipation plate, when a temperature sensor detects that the temperature in a power distribution cabinet body is relatively high, the gap-variable heat dissipation plate can adsorb heat in the power distribution cabinet in a compact state; heat in the power distribution cabinet body is quickly conducted into the outer shield, then the gap-variable heat dissipation plate can be adjusted to be in a loose state, the surface area is enlarged by dozens of times, and by matching with the air draft effect of the exhaust fan, on one hand, high-temperature air in the power distribution cabinet body can be quickly exhausted; and on the other hand, external air with low temperature can quickly pass through the loose gap-variable heat dissipation plate, so that heat is quickly taken away, compared with the prior art, the temperature in the power distribution cabinet body can be effectively regulated and controlled, the operation temperature tends to an intermediate value of safe operation temperature, the operation stability of the power distribution cabinet body is effectively ensured, and the service life of the power distribution cabinet body is prolonged. And the service life of an internal electrical element is not easy to influence.

Description

Technical Field

[0001] The present invention relates to a high-stability power distribution cabinet for a building electrical system, and in particular to a high-stability power distribution cabinet for a building electrical system applied in the field of power distribution cabinets. Background Art

[0002] For power distribution cabinets installed indoors in buildings, special heat dissipation modules are rarely provided. Heat dissipation is mainly achieved by opening heat dissipation holes. Heat dissipation generally relies on a ventilation system with temperature control in the machine room, such as an air conditioner. By adjusting the temperature and ventilation in the machine room, air exchange inside and outside the power distribution cabinet is driven to achieve heat dissipation of the power distribution cabinet. For example, the specification of Chinese patent CN211958329U discloses a building electrical distribution cabinet, and the specification of Chinese patent CN213692731U discloses a building electrical distribution cabinet.

[0003] For the distribution cabinet of the building electrical system, it is generally in a state of continuous power-on operation, and there are many electrical components in the distribution cabinet, which is prone to internal heat accumulation. This heat dissipation method has a poor effect on accelerating the air circulation speed in the cabinet, and the heat cannot be discharged in time, resulting in the operating temperature of the distribution cabinet, which is often closer to the high temperature value of the safe operating temperature. When an abnormality occurs, it is easy to reach an extreme high temperature that exceeds the safe operating temperature, affecting the stability of the distribution cabinet operation. Long-term high-temperature operation can easily reduce the service life of the electrical components in the electrical cabinet. Summary of the invention

[0004] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that heat dissipation is achieved only by using the temperature system in the building machine room, which has a poor heat dissipation effect and affects the stability of the operation of the distribution cabinet.

[0005] In order to solve the above problems, the present invention provides a high-stability power distribution cabinet for a building electrical system, comprising a power distribution cabinet body with a control center, a temperature sensor installed inside the power distribution cabinet body, the temperature sensor is connected to the control center signal, long air inlet openings are drilled at the left and right lower ends of the bottom of the power distribution cabinet body, an air exchange box and an outer protective cover are fixedly connected to the back of the power distribution cabinet body, an air guide neck is fixedly connected between the air exchange box and the outer protective cover, and the air exchange box and the outer protective cover are connected through the air guide neck, an exhaust fan is installed inside the air exchange box, a heat exhaust port is fixedly embedded at the outer end of the air exchange box, the exhaust port of the exhaust fan is directly opposite to the heat exhaust port, two ducts are fixedly connected at the air inlet of the exhaust fan, and the two ducts are respectively communicated with the inside of the power distribution cabinet body and the air guide neck, and a plurality of evenly distributed air intake circular holes are drilled at the lower end of the outer protective cover; A variable-gap heat sink is provided in the outer protective cover. The variable-gap heat sink is fixedly passed through the power distribution cabinet body and is flush with the inner wall of the power distribution cabinet body. The variable-gap heat sink includes a heat-absorbing back plate connected to the power distribution cabinet body, a heat-gathering and dispersing thermal conductive sheet matched with the end of the heat-absorbing back plate away from the power distribution cabinet body, and a limiting cover arranged outside the heat-gathering and dispersing thermal conductive sheet. The limiting cover is fixedly connected to the heat-absorbing back plate, and a plurality of evenly distributed side holes are drilled at the end of the limiting cover away from the heat-absorbing back plate, and a plurality of vertical holes distributed in a rectangular array are drilled at both the upper and lower ends of the limiting cover.

[0006] In the high-stability distribution cabinet for the above-mentioned building electrical system, the temperature inside the distribution cabinet body can be effectively regulated by means of a variable-gap heat sink with variable density and an exhaust fan, so that its operating temperature approaches the middle value of the safe operating temperature, thereby effectively ensuring the stability of the operation of the distribution cabinet body and reducing the service life of its internal electrical components from being easily affected.

[0007] As a further improvement of the present application, the heat-gathering and dispersing thermal conductive sheet includes two variable gap plates and a variable gap capsule fixedly connected between the two variable gap plates. One end of the variable gap plate close to the side of the heat-absorbing back plate is fixedly connected with a plurality of guide rods corresponding to the plurality of side holes. The guide rods move through the variable gap capsule, the other variable gap plate and the side holes in sequence and extend to the outside of the variable gap heat dissipation plate. The interior of the variable gap capsule is unsaturatedly filled with heat-absorbing particles.

[0008] As a further improvement of the present application, a plurality of breathable isolation belts are fixedly connected between the left and right inner walls of the variable gap capsule, and the plurality of breathable isolation belts divide the variable gap capsule into a plurality of heat absorption chambers. The heat absorption particles are located in the plurality of heat absorption chambers, and at least 1 / 4 of the gap is left in each of the plurality of heat absorption chambers. The heat absorption particles are formed by a uniform mixture of hard lubricating particles and small pebbles in a volume ratio of 1:3-5.

[0009] As a further improvement of the present application, an electromagnetic sheet is fixedly embedded inside the limiting cover, the variable gap plate close to the limiting cover is made of magnetic material, and the on and off of the electromagnetic sheet is controlled by the control center.

[0010] As a further improvement of the present application, the other end of the variable gap plate close to one side of the heat absorbing back plate is fixedly connected with a plurality of evenly distributed hole blocking strips, and one end of the heat absorbing back plate close to the variable gap capsule is drilled with a plurality of gap forming holes, and the plurality of gap forming holes are respectively matched with the plurality of hole blocking strips.

[0011] As a further improvement of the present application, the left and right ends of the two variable gap plates are slidably connected to the corresponding inner walls of the heat absorbing back plate and are made of flexible breathable material. When the variable gap capsule is in a fully extended state, the thickness of the heat-gathering and dispersing thermal conductive plate is smaller than the distance between the inner wall of the limit cover and the heat absorbing back plate.

[0012] As another improvement of the present application, the breathable isolation belt includes a bearing plate and two breathable strips respectively fixedly connected between the left and right ends of the bearing plate and the two variable gap plates. The breathable strips are porous flexible structures, and the bearing plate is a hard plate-like structure.

[0013] As another improvement supplement to the present application, the cross-section of the variable gap sac is an inverted U-shape, and the bottom of the inverted U-shape is also fixedly connected to a breathable isolation belt, a linkage tube is movably passed through the middle of multiple bearing plates, the lower end of the linkage tube extends to the outside of the variable gap sac and is fixedly connected to an electric push rod between the inner bottom end of the outer protective cover, and the outer end of the linkage tube is also fixedly connected to multiple support plates, and the multiple support plates are respectively located under the multiple bearing plates and are in contact with the corresponding bearing plates.

[0014] In summary, in the high-stability distribution cabinet for the above-mentioned building electrical system, through the setting of the variable-gap heat sink, when the temperature sensor detects that the temperature inside the distribution cabinet body is high, the variable-gap heat sink can absorb the heat inside the distribution cabinet in a dense state, and quickly conduct the heat inside the distribution cabinet body to the outer protective cover. Then, the variable-gap heat sink can be adjusted to a loose state to increase the surface area by dozens of times. With the exhaust effect of the exhaust fan, on the one hand, the high-temperature air in the distribution cabinet body can be quickly extracted, and on the other hand, the air with lower outside temperature can quickly pass through the loose variable-gap heat sink, thereby quickly taking away the heat. Compared with the existing technology, the temperature inside the distribution cabinet body can be effectively regulated, so that its operating temperature tends to the middle value of the safe operating temperature, thereby effectively ensuring the stability of the operation of the distribution cabinet body, and the service life of its internal electrical components is not easily affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is an overall stereogram of the first embodiment of the present application; Figure 2 A partial perspective view of the first embodiment of the present application; Figure 3 This is a bottom-up stereogram of the first embodiment of the present application; Figure 4 This is a partial exploded view of the variable gap heat sink of the first embodiment of the present application when absorbing heat; Figure 5 This is a partial exploded view of the variable gap heat sink of the first embodiment of the present application when dissipating heat; Figure 6 It is the schematic diagram of point A in 5; Figure 7 This is a partial cross-sectional view of the heat-dispersing sheet of the first embodiment of the present application during heat dissipation; Figure 8 This is a partial cross-sectional view of the heat-conducting sheet of the first embodiment of the present application when absorbing heat; Fig. 9This is a cross-sectional comparison diagram of the variable gap heat sink of the first embodiment of the present application when absorbing and releasing heat; Fig.10 This is a cross-sectional view of a heat-conducting sheet according to a second embodiment of the present application; Fig.11 This is a cross-sectional view of the heat-conducting sheet when the heat-absorbing particles are loosened in the second embodiment of the present application.

[0016] Description of the numbers in the figure: 1 distribution cabinet body, 101 long air inlet, 2 air exchange box, 201 heat exhaust port, 3 outer shield, 301 air inlet circular hole, 4 air guide neck, 5 variable gap heat sink, 51 limit cover, 52 heat absorption back plate, 531 variable gap plate, 532 variable gap capsule, 533 blocking strip, 534 guide rod, 501 vertical hole, 502 side hole, 503 gap hole, 6 breathable isolation belt, 61 bearing plate, 62 breathable strip, 71 electric push rod, 72 linkage pipe, 73 support plate. DETAILED DESCRIPTION

[0017] Two implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0018] The first implementation method: Figure 1-3A high-stability distribution cabinet for a building electrical system is shown, comprising a distribution cabinet body 1 with a control center, a temperature sensor is installed inside the distribution cabinet body 1, and the temperature sensor is connected to the control center signal, and long air inlet openings 101 are opened at the left and right lower ends of the bottom of the distribution cabinet body 1, an air exchange box 2 and an outer protective cover 3 are fixedly connected to the back of the distribution cabinet body 1, an air guide neck 4 is fixedly connected between the air exchange box 2 and the outer protective cover 3, and the air exchange box 2 and the outer protective cover 3 are connected through the air guide neck 4, an exhaust fan is installed inside the air exchange box 2, and the air exchange The outer end of the exchange box 2 is fixedly inlaid with a heat exhaust port 201, and the exhaust port of the exhaust fan is directly opposite to the heat exhaust port 201. Two ducts are fixedly connected to the air inlet of the exhaust fan, and the two ducts are respectively connected to the inside of the distribution cabinet body 1 and the air guide neck 4. A plurality of evenly distributed air inlet circular holes 301 are drilled at the lower end of the outer shield 3. A variable gap heat sink 5 is arranged inside the outer shield 3. The variable gap heat sink 5 is fixedly penetrated through the distribution cabinet body 1 and is flush with the inner wall of the distribution cabinet body 1. When in use, the variable gap heat sink 5 can absorb the heat in the distribution cabinet body 1 and guide it outward to the outer shield 3. When the temperature sensor detects that the temperature inside the distribution cabinet body 1 is too high, the exhaust fan can be started. On the one hand, the hot air in the distribution cabinet body 1 can be extracted. On the other hand, the heat-absorbing particles inside the variable-gap heat sink 5 can be controlled to be dispersed and in a loose state, thereby increasing the surface area by dozens of times. Under the suction of the exhaust fan, the heat absorption particles can be fully exchanged with the air through heat convection, thereby greatly accelerating the heat discharge, and realizing the regulation of the temperature inside the distribution cabinet body 1, so that it is always in the middle value of the safe operating temperature range or a smaller value in the middle. Compared with the prior art, it can effectively avoid the distribution cabinet body 1 from running at a relatively high temperature, which can protect the electrical components so that their service life is not easily affected, and at the same time effectively ensure the stable operation of the distribution cabinet body 1, so that the power system in the building is not easily affected. In summary, through the coordinated setting of the variable-gap heat sink 5 with variable density and the exhaust fan, the temperature inside the distribution cabinet body 1 can be effectively regulated, so that its operating temperature tends to the middle value of the safe operating temperature, thereby effectively ensuring the stability of the operation of the distribution cabinet body 1, and the service life of the internal electrical components is not easily affected.

[0019] Figure 4As shown, the variable gap heat sink 5 includes a heat absorbing back plate 52 connected to the power distribution cabinet body 1, a gathering and dispersing heat conductive sheet matched with the end of the heat absorbing back plate 52 away from the power distribution cabinet body 1, and a limiting cover 51 arranged outside the gathering and dispersing heat conductive sheet, the limiting cover 51 is fixedly connected to the heat absorbing back plate 52, and a plurality of evenly distributed side holes 502 are drilled at one end of the limiting cover 51 away from the heat absorbing back plate 52, and a plurality of vertical holes 501 distributed in a rectangular array are drilled at the upper and lower ends of the limiting cover 51. When the exhaust fan is started, due to the suction force of the exhaust fan, the outside air enters the outer protective cover 3 along the air inlet circular hole 301, part of the air directly fills the outer protective cover 3 and exchanges heat with the surface of the variable gap heat sink 5 and then is discharged along the air guide neck 4, and part of the air can enter the variable gap heat sink 5 along the vertical holes 501 and the side holes 502, and then fully contact with the gathering and dispersing heat conductive sheet, thereby accelerating the discharge of heat.

[0020] like Figure 7 The heat-gathering and dispersing heat conducting sheet includes two variable gap plates 531 and a variable gap capsule 532 fixedly connected between the two variable gap plates 531. One end of the variable gap plate 531 close to the side of the heat-absorbing back plate 52 is fixedly connected with a plurality of guide rods 534 corresponding to the plurality of side holes 502. The guide rods 534 sequentially move through the variable gap capsule 532, another variable gap plate 531 and the side hole 502 and extend to the outside of the variable gap heat dissipation plate 5. The variable gap capsule 532 is unsaturatedly filled with heat-absorbing particles. The limiting cover 51 is fixedly inlaid with The variable gap plate 531 near the limit cover 51 is made of magnetic material, and the on and off of the electromagnetic plate is controlled by the control center. The other end of the variable gap plate 531 near the heat absorbing back plate 52 is fixedly connected with a plurality of evenly distributed blocking bars 533. The end of the heat absorbing back plate 52 near the variable gap capsule 532 is drilled with a plurality of gap holes 503, and the plurality of gap holes 503 are matched with the plurality of blocking bars 533 respectively. When in use, the electromagnetic plate in the limit cover 51 can be controlled to be energized first, such as Figure 4 and Figure 8 , so that it generates thrust on the two variable gap plates 531, on the one hand, the variable gap capsule 532 is squeezed and thus in a dense state, and on the other hand, a plurality of hole blocking bars 533 are embedded in the gap holes 503, so that the heat-collecting and dispersing conductive sheet and the heat-absorbing back plate 52 are connected as a whole, and thus can continuously absorb heat outward; Figure 5-Figure 7 When the temperature in the power distribution cabinet body 1 is too high, the direction of the current passing through the electromagnetic sheet can be changed so that the electromagnetic sheet generates suction on the two variable gap plates 531. On the one hand, 522 is stretched. At this time, the heat-absorbing particles in it are dispersed and in a loose state, so that the gaps between them are increased, which is convenient for heat exchange with the air. On the other hand, Fig. 9, so that the blocking strip 533 is separated from the gap-forming hole 503, thereby forming a flow gap between the variable gap plate 531 and the heat-absorbing back plate 52. At this time, when the exhaust fan is started, the outside air can enter 522 and fully contact the heat-absorbing particles, thereby greatly accelerating the heat dissipation. At the same time, part of the air can pass through the flow gap, that is, penetrate through the middle of the variable gap heat dissipation plate 5, thereby exchanging heat with the inside and achieving rapid heat dissipation; When in use, the variable-gap heat sink 5 is continuously switched back and forth to achieve fast and efficient heat dissipation, thereby maintaining safe and stable operation of the power distribution cabinet body 1.

[0021] A plurality of breathable isolation belts 6 are fixedly connected between the left and right inner walls of the variable gap capsule 532, and the plurality of breathable isolation belts 6 divide the variable gap capsule 532 into a plurality of heat absorption chambers. The heat absorption particles are located in the plurality of heat absorption chambers, and at least 1 / 4 of a gap is left in each of the plurality of heat absorption chambers, so that the heat absorption particles in the variable gap capsule 532 are not easily accumulated, which is convenient for subsequent heat exchange with the air and heat dissipation. The heat absorption particles are formed by uniformly mixing hard lubricating particles and small pebbles in a volume ratio of 1:3-5. The hard lubricating particles can be selected from graphite, boron nitride and sodium stearate, which are used as lubricants to enable the heat-dispersing thermal conductive sheet to lubricate each other when changing its state between dense and loose, and it is not easy for the particles to break and wear.

[0022] It is worth noting that the particle size of hard lubricating particles and pebbles is 5-10mm, so it is not easy for the particles to be too small to cause small gaps between each other, making it difficult to fully contact with the air.

[0023] The left and right ends of the two variable gap plates 531 are slidably connected to the corresponding inner walls of the heat absorbing back plate 52. 522 is made of flexible breathable material. When the variable gap capsule 532 is in a fully extended state, the thickness of the gathering and dispersing heat conductive sheet is less than the distance between the inner wall of the limiting cover 51 and the heat absorbing back plate 52, which effectively ensures that when heat dissipation is required, the electromagnetic sheet adsorbs the variable gap plate 531 to make the variable gap capsule 532 fully extended, and the blocking strip 533 can be separated from the gap hole 503, so that there is space to generate a flow gap, so that air can pass through the inside of the variable gap heat sink 5, thereby ensuring the heat dissipation speed.

[0024] In summary, in the high-stability distribution cabinet for the above-mentioned building electrical system, through the setting of the variable-gap heat sink 5, when the temperature sensor detects that the temperature inside the distribution cabinet body 1 is high, the variable-gap heat sink 5 can absorb the heat inside the distribution cabinet in a dense state, and quickly conduct the heat inside the distribution cabinet body 1 to the outer protective cover 3. Then, the variable-gap heat sink 5 can be adjusted to a loose state to increase the surface area by dozens of times. With the exhaust effect of the exhaust fan, on the one hand, the high-temperature air in the distribution cabinet body 1 can be quickly extracted, and on the other hand, the air with lower external temperature can quickly pass through the loose variable-gap heat sink 5, thereby quickly taking away the heat. Compared with the prior art, the temperature inside the distribution cabinet body 1 can be effectively regulated, so that its operating temperature tends to the middle value of the safe operating temperature, thereby effectively ensuring the stability of the operation of the distribution cabinet body 1, and the service life of its internal electrical components is not easily affected.

[0025] The second implementation method: Based on the first embodiment, this embodiment further improves the breathable isolation belt 6 and adds some relevant contents, and the rest is consistent with the first embodiment.

[0026] Fig.10 As shown, the breathable isolation belt 6 includes a bearing plate 61 and two breathable strips 62 respectively fixedly connected between the left and right ends of the bearing plate 61 and the two variable gap plates 531. The breathable strips 62 are porous flexible structures, and the bearing plate 61 is a hard plate-like structure.

[0027] The cross-section of the variable gap capsule 532 is an inverted U-shape, and the bottom of the inverted U-shape is also fixedly connected to the breathable isolation belt 6. A linkage tube 72 is movably passed through the middle of multiple bearing plates 61. The lower end of the linkage tube 72 extends to the outside of the variable gap capsule 532 and is fixedly connected to an electric push rod 71 between the bottom end of the outer shield 3. The outer end of the linkage tube 72 is also fixedly connected to multiple support plates 73. The multiple support plates 73 are respectively located under the multiple bearing plates 61 and contact with the corresponding bearing plates 61. When in use, when the heat-gathering and dissipating conductive sheet is in a loose state for heat dissipation, the control center can control the electric push rod 71 to continuously extend and shorten. Under the limit of the support plate 73 and the gravity of the heat-absorbing particles, the middle of the multiple breathable isolation belts 6 are repeatedly lifted and fell back, so that the heat-absorbing particles are in a dynamic state, thereby effectively assisting them to exchange heat with the air, so that the heat dissipation effect is better, and it is convenient to quickly control the temperature in the distribution cabinet body 1.

[0028] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A high-stability distribution cabinet for a building electrical system, characterized in that: The invention comprises a power distribution cabinet body (1) with a control center, wherein a temperature sensor is installed inside the power distribution cabinet body (1), wherein the temperature sensor is connected to the control center signal, wherein both left and right lower ends of the bottom of the power distribution cabinet body (1) are provided with air inlet long openings (101), wherein an air exchange box (2) and an outer protective cover (3) are fixedly connected to the back of the power distribution cabinet body (1), wherein an air guide neck (4) is fixedly connected between the air exchange box (2) and the outer protective cover (3), and wherein the air exchange box (2) and the outer protective cover (3) are connected to each other. The shields (3) are connected via an air guide neck (4); an exhaust fan is installed inside the air exchange box (2); a heat exhaust port (201) is fixedly embedded at the outer end of the air exchange box (2); the exhaust port of the exhaust fan faces the heat exhaust port (201); two conduits are fixedly connected at the air inlet of the exhaust fan, and the two conduits are respectively connected to the inside of the power distribution cabinet body (1) and the air guide neck (4); and a plurality of evenly distributed air inlet circular holes (301) are drilled at the lower end of the outer shield (3); A variable-gap heat sink (5) is provided inside the outer protective cover (3). The variable-gap heat sink (5) is fixedly passed through the power distribution cabinet body (1) and is flush with the inner wall of the power distribution cabinet body (1). The variable-gap heat sink (5) comprises a heat absorbing back plate (52) connected to the power distribution cabinet body (1), a heat-gathering and dispersing conductive sheet matched with an end of the heat absorbing back plate (52) away from the power distribution cabinet body (1), and a limiting cover (51) arranged outside the heat-gathering and dispersing conductive sheet. The limiting cover (51) is fixedly connected to the heat absorbing back plate (52). An end of the limiting cover (51) away from the heat absorbing back plate (52) is provided with a plurality of evenly distributed side holes (502). The upper and lower ends of the limiting cover (51) are provided with a plurality of vertical holes (501) distributed in a rectangular array.

2. A high-stability distribution cabinet for a building electrical system according to claim 1, characterized in that: The heat-gathering and dispersing conductive sheet comprises two variable gap plates (531) and a variable gap capsule (532) fixedly connected between the two variable gap plates (531); one end of the variable gap plate (531) close to the side of the heat-absorbing back plate (52) is fixedly connected to a plurality of guide rods (534) corresponding to the plurality of side holes (502); the guide rods (534) are movable through the variable gap capsule (532), another variable gap plate (531) and the side holes (502) in sequence and extend to the outside of the variable gap heat dissipation plate (5); the variable gap capsule (532) is unsaturatedly filled with heat-absorbing particles.

3. A high-stability distribution cabinet for a building electrical system according to claim 2, characterized in that: A plurality of air-permeable isolation belts (6) are fixedly connected between the left and right inner walls of the variable gap capsule (532), and the plurality of air-permeable isolation belts (6) divide the variable gap capsule (532) into a plurality of heat-absorbing cavities. The heat-absorbing particles are located in the plurality of heat-absorbing cavities, and at least 1 / 4 of the space is left in each of the plurality of heat-absorbing cavities. The heat-absorbing particles are formed by uniformly mixing hard lubricating particles and small pebbles in a volume ratio of 1:3-5.

4. A high-stability distribution cabinet for a building electrical system according to claim 3, characterized in that: An electromagnetic sheet is fixedly embedded inside the limiting cover (51), and a gap-changing plate (531) close to the limiting cover (51) is made of a magnetic material. The on and off of the electromagnetic sheet is controlled by a control center.

5. A high-stability distribution cabinet for a building electrical system according to claim 4, characterized in that: The other end of the gap-changing plate (531) close to one side of the heat-absorbing back plate (52) is fixedly connected to a plurality of evenly distributed hole-blocking strips (533); one end of the heat-absorbing back plate (52) close to the gap-changing capsule (532) is drilled with a plurality of gap-forming holes (503); the plurality of gap-forming holes (503) are respectively matched with the plurality of hole-blocking strips (533).

6. A high-stability distribution cabinet for a building electrical system according to claim 5, characterized in that: The left and right ends of the two variable gap plates (531) are slidably connected to the corresponding inner walls of the heat absorbing back plate (52); the (522) is made of a flexible breathable material; when the variable gap capsule (532) is in a fully extended state, the thickness of the heat-gathering and dispersing conductive sheet is smaller than the distance between the inner wall of the limiting cover (51) and the heat absorbing back plate (52).

7. A high-stability distribution cabinet for a building electrical system according to claim 6, characterized in that: The breathable isolation belt (6) comprises a bearing plate (61) and two breathable strips (62) respectively fixedly connected between the left and right ends of the bearing plate (61) and the two variable gap plates (531); the breathable strips (62) are porous flexible structures, and the bearing plate (61) is a hard plate-like structure.

8. A high-stability distribution cabinet for a building electrical system according to claim 7, characterized in that: The cross section of the variable gap capsule (532) is an inverted U-shape, and the bottom of the inverted U-shape is also fixedly connected to a breathable isolation belt (6). A linkage tube (72) is movably penetrated through the middle of the plurality of bearing plates (61). The lower end of the linkage tube (72) extends outside the variable gap capsule (532) and is fixedly connected to an electric push rod (71) between the inner bottom end of the outer shield (3). The outer end of the linkage tube (72) is also fixedly connected to a plurality of support plates (73). The plurality of support plates (73) are respectively located below the plurality of bearing plates (61) and are in contact with the corresponding bearing plates (61).

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