A power distribution cabinet for a power distribution room with fixed-point heat dissipation function

Abstract

The present invention relates to the technical field of power distribution cabinets, and specifically to a power distribution cabinet for a power distribution room with a fixed-point heat dissipation function. The power distribution cabinet comprises a cabinet body, a flow guide device, a pressure regulating device and a fan. The cabinet body is connected to the flow guide device, the pressure regulating device is connected to the cabinet body, and the pressure regulating device and the flow guide device are connected through pipelines. The pressure regulating device is used for internal circulation cooling of gas, and a power distribution space is provided through a power distribution cavity. The flow guide device is used for gas flow guidance, and automatically screens the incoming air delivered by the fan to prevent gas with excessive humidity from entering the power distribution cavity to cause sparking and short circuit. The heated gas is internally circulated and regulated by the pressure regulating device, and the internal circulation efficiency is improved by pressure regulation and temperature reduction. The internal circulation and air supply by an external fan are used to improve the cooling efficiency of electrical components in the power distribution cabinet to prevent overheating from affecting the power distribution quality.

Description

Technical Field

[0001] The invention relates to the technical field of power distribution cabinets, in particular to a power distribution cabinet for a power distribution room with a fixed-point heat dissipation function. Background Art

[0002] A distribution room generally refers to an indoor distribution location with low-voltage loads, which contains several distribution cabinets and is mainly used for power distribution and control in the area.

[0003] Generally speaking, the working environment of traditional power distribution rooms is relatively complex. The indoor air humidity is affected by the weather and changes constantly. Compared with high-voltage distribution cabinets, they do not require strong insulation. Most of them use open or semi-open cabinets with good heat dissipation performance. However, excessive air humidity can also cause local fires. Conventional distribution cabinets cannot automatically screen for different air humidity levels, affecting the safety of the distribution cabinet.

[0004] In addition, since there are many electrical components inside the distribution cabinet, the power usage of each component is different, and it is impossible to automatically identify the high power consumption area and perform targeted heat dissipation, which affects the heat dissipation efficiency. Summary of the invention

[0005] The object of the present invention is to provide a power distribution cabinet for a power distribution room with a fixed-point heat dissipation function, so as to solve the problems raised in the above-mentioned background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solution: a power distribution cabinet for a power distribution room with a fixed-point heat dissipation function.

[0007] A power distribution cabinet for a power distribution room with a fixed-point heat dissipation function, the power distribution cabinet comprising a cabinet body, a flow guide device, a pressure regulating device and a fan, the cabinet body and the flow guide device are connected, the pressure regulating device and the cabinet body are connected, the pressure regulating device and the flow guide device are connected by pipeline, the pressure regulating device is used for internal circulation of gas for cooling, the fan and the cabinet body are tightly connected, a power distribution cavity is provided on the cabinet body, an air inlet is provided on one side of the power distribution cavity, and the fan outlet is connected to the air inlet pipeline.

[0008] The cabinet body is used as the main installation basis to install and fix other devices. The distribution cavity provides distribution space. The guide device is used for gas diversion. The air intake delivered by the fan is automatically screened to prevent the gas with excessive humidity from entering the distribution cavity and causing sparks and short circuits. The heated gas is circulated internally through the pressure regulating device. The temperature is reduced by pressure regulation to improve the internal circulation efficiency. The internal circulation and external fan air supply improve the cooling efficiency of the electrical components in the distribution cabinet to avoid overheating affecting the distribution quality.

[0009] Furthermore, the air inlet duct is provided with a contraction duct, a straight duct and an expansion duct in sequence along the air supply direction, the contraction duct, the straight duct and the expansion duct are connected in sequence, and the fan is connected to the contraction duct;

[0010] The flow guide device includes a switching component and an air distribution pipe. The switching component includes two electrode sheets. The two electrode sheets are arranged along the walls on both sides of the straight channel. The two electrode sheets are respectively connected to two wiring terminals of the power supply. The electrode sheets and the power supply constitute a switching circuit. A wet air channel is provided on one side of the expanded channel. The air distribution pipe is arranged along the electrical components in the distribution cavity. The end of the expanded channel is connected to the air distribution pipe, and the air outlet on the air distribution pipe faces the electrical components.

[0011] The air inlet duct is set in three sections, with the diameter of the contraction duct gradually decreasing, the diameter of the straight duct remaining unchanged, and the diameter of the expansion duct gradually increasing. When the airflow pumped by the fan enters the contraction duct, the air density gradually increases as the diameter decreases. When it enters the straight duct, the density is the largest. The air humidity is detected by two electrode sheets. When the air humidity exceeds the standard value, the switching circuit composed of the electrode sheets and the power supply is turned on. The airflow is not suitable for being introduced into the distribution cavity for cooling. The airflow is sent into the wet air duct and discharged through the wet air duct. When the air humidity is lower than the standard value, it can be used to cool the electrical components. It is sent into the air distribution pipe through the expansion duct. The air outlet of the air distribution pipe faces the electrical components, and the air flow cools the electrical components. In the low-voltage power distribution process, since the air has a certain humidity and a large specific heat capacity, the amount of heat absorbed increases when the temperature rises at the same time, thereby improving the cooling and heat dissipation efficiency.

[0012] Furthermore, the switching assembly also includes an electromagnet and a rotating plate, a switching slot is provided on one side of the expansion channel, the electromagnet is placed in the switching slot, the rotating plate and the switching slot are rotatably connected, the rotating plate is made of a magnetic material, and the electromagnet is electrically connected to the switching circuit;

[0013] During switching: the facing ends of the electromagnet and the rotating plate are the same magnetic poles, the end of the rotating plate faces the wet air channel, and the rotating plate cuts off the expanded channel.

[0014] The switching component is used to switch the intake air flow path. The switching circuit current is sent to the controller, and the controller controls the current size of the input electromagnet. When the air humidity is lower than the standard value, the air flow enters the air distribution pipe along the expansion channel. When the air humidity exceeds the standard value, the switching circuit is turned on, and power is supplied to the electromagnet through the controller. The electromagnet and the rotating plate have the same magnetic poles. Under the action of the magnetic pole repulsion, the rotating plate rotates upward, partially cutting off the expansion channel and facing the wet air duct. The wet air flow is discharged from the wet air duct to avoid ignition of electrical components caused by excessive air humidity.

[0015] Furthermore, the guide device also includes an air distribution plate and a circulation pump, the air distribution plate and the air distribution pipe are adapted, the air distribution plate and the air distribution pipe in the same group are respectively located on the upper and lower sides of the electrical component, an air return port is provided on the air distribution plate, the air return port and the air outlet on the air distribution pipe are adapted, the ends of the air return ports on the same air distribution plate converge into an air collecting duct, the circulation pump inlet and the air collecting duct are connected, an annular air bag is provided in the air return port, a plurality of sealing plates are provided in the inner circle of the annular air bag, the plurality of sealing plates are fan-shaped, the sealing plates and the air return port are rotatably connected, and the rotation center of the sealing plates is located above the contact point between the sealing plates and the annular air bag.

[0016] After the gas ejected from the air distribution pipe exchanges heat with the electrical components, the air density decreases and flows upward to enter the return air port of the air distribution plate. The annular airbag is filled with compressed gas, which controls the expansion degree of the annular airbag by exchanging heat with the rising gas. When the rising gas is overheated, the instantaneous heat exchange of the annular airbag increases and the volume expands. Since the outer ring is fixed, it expands inward, driving the lower end of the sealing plate to rotate inward. In the initial state of the sealing plate, the upper end tilts inward. During the inward rotation of the lower end of the sealing plate, the opening of the upper end gradually increases. When pumping air through the circulating pump, the air flow velocity of the return air port above the electrical components with high heat generation increases. When the air distribution pipe is used for jet heat dissipation, the pressure of the electrical components with fast flow velocity above is reduced. Through the differential pressure, the cold air with slow flow velocity flows to the electrical components with fast flow velocity, thereby assisting the heat dissipation of the high-temperature electrical components and improving the heat dissipation efficiency through fixed-point heat dissipation.

[0017] Furthermore, the pressure regulating device includes a boosting cylinder, a pressure regulating chamber is provided on the cabinet, the boosting cylinder is placed in the pressure regulating chamber, the output end of the boosting cylinder is in sliding contact with the pressure regulating chamber, a heat exchange plate is provided in the pressure regulating chamber, and the circulating pump outlet is connected to the pressure regulating chamber pipeline.

[0018] The output end of the booster cylinder adopts a plate structure, with a sealing gasket on the outside, which is in sealed contact with the wall of the pressure regulating chamber to facilitate pressure regulation. When the airflow after heat exchange is sent into the pressure regulating chamber through the circulation pump, the booster cylinder output displacement, and when the output end moves along the wall of the pressure regulating chamber, the airflow is pressurized. As the pressure increases, the water vapor in the airflow liquefies, and the liquefaction process releases heat, which increases the temperature of the gas-liquid mixed phase. There are heat exchange fins extending outward in the pressure regulating chamber. When the outside atmospheric temperature is constant, the heat exchange efficiency is improved by increasing the temperature difference between the inside and the outside.

[0019] Furthermore, the pressure regulating device also includes a plugging plate, the output end of the boosting cylinder is connected to the plugging plate, a flow port is provided on the plugging plate, the flow port and the outlet of the pressure regulating chamber are intermittently connected, the outlet of the pressure regulating chamber is connected to the expansion channel, a tail flow groove is provided on the outside of the cabinet, the opening of the tail flow groove is arranged upward, and the end of the heat exchange plate away from the pressure regulating chamber is inserted into the tail flow groove;

[0020] During heat exchange: the flow port and the pressure regulating chamber outlet are not conducting;

[0021] When leaking: the flow port and the pressure regulating chamber outlet are connected.

[0022] The movement of the output end of the boost cylinder in the pressure regulating chamber is divided into two processes. In the first process, the water vapor in the airflow is liquefied through space compression, and heat exchange and cooling are carried out through the heat exchange plate. In the second process, after the heat exchange is completed, the boost cylinder continues to output displacement until the flow port and the pressure regulating chamber outlet are connected. The boost cylinder sends the cooled airflow through the pressure regulating chamber outlet into the expansion channel. This part of the airflow is pressurized and dehumidified, and heat exchanged and cooled for internal circulation cooling.

[0023] As an optimization, the end of the wet gas channel is connected to the tail flow trough. The airflow with high humidity is sent into the tail flow trough through the wet gas channel. Within a certain range, the specific heat capacity of the airflow increases with the increase of humidity, so that the airflow in the pressure regulating cavity maintains a high temperature difference state for a long time during the heat exchange process with the external wet airflow through the heat exchange plate, thereby improving the heat exchange efficiency.

[0024] As an optimization, the vertical cross section of the flow port is smaller than the cross section of the pressure regulating chamber outlet. Since the vertical cross section of the flow port is smaller than the cross section of the pressure regulating chamber outlet, an exhaust stroke is formed during the exhaust process, and the exhausted gas is used for internal circulation cooling.

[0025] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: when the airflow pumped by the fan enters the contraction channel, as the diameter decreases, the air density gradually increases, and when entering the straight channel, the density is the largest, and the air humidity is detected by two electrode sheets. When the air humidity exceeds the standard value, the switching circuit composed of the electrode sheets and the power supply is turned on, and the airflow is not suitable for being introduced into the distribution cavity for cooling. The airflow is sent into the wet air channel and discharged through the wet air channel. When the air humidity is lower than the standard value, it can be used to cool the electrical components. It is sent into the air distribution pipe through the expansion channel, and the air outlet of the air distribution pipe faces the electrical components. The air flow cools the electrical components. In the low-voltage power distribution process, since the air has a certain humidity and a large specific heat capacity, the amount of heat absorbed increases when the temperature is raised at the same time, thereby improving the cooling and heat dissipation efficiency. When the air humidity exceeds the standard value, the switching circuit is turned on, and the controller is used to The electromagnet is powered, and the electromagnet and the rotating plate have the same magnetic poles. Under the action of the magnetic pole repulsion, the rotating plate rotates upward, partially cutting off the expanded channel and heading towards the wet air channel. The wet air flow is discharged from the wet air channel to avoid ignition of electrical components due to excessive air humidity. When the floating gas is overheated, the instantaneous heat exchange of the annular air bag increases, and the volume expansion increases. Since the outer ring is fixed, it expands inward, driving the lower end of the sealing plate to rotate inward. In the initial state of the sealing plate, the upper end tilts inward. During the inward rotation of the lower end of the sealing plate, the upper end opening gradually increases. When pumping air through the circulating pump, the return air inlet air flow velocity above the electrical components with high heat generation increases. When jet heat dissipation is performed in the air distribution pipe, the pressure of the electrical components with fast flow velocity above is reduced. Through the differential pressure, the cold air with slow flow velocity flows to the electrical components with fast flow velocity, thereby assisting the heat dissipation of the high-temperature electrical components and improving the heat dissipation efficiency through fixed-point heat dissipation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, and the above and / or other advantages of the present invention will become more clear.

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 It is a schematic diagram of the air intake structure of the present invention;

[0029] Figure 3 is a schematic diagram of air intake detection of the present invention;

[0030] Figure 4 yes Figure 3 A magnified view of a part of the view;

[0031] Figure 5 It is a schematic diagram of the structure of the air distribution plate of the present invention;

[0032] Figure 6 It is a schematic diagram of the sealing plate structure of the present invention;

[0033] Figure 7 It is a schematic diagram of the structure of the voltage regulating device of the present invention;

[0034] Figure 8 This is a schematic diagram of the internal circulation gas heat exchange of the present invention;

[0035] In the figure: 1. cabinet; 11. distribution chamber; 12. air inlet; 121. contraction channel; 122. straight channel; 123. expansion channel; 13. switching slot; 14. wet gas channel; 15. tail flow slot; 16. pressure regulating chamber; 2. flow guide device; 21. switching assembly; 211. electrode plate; 212. electromagnet; 213. rotating plate; 22. air distribution plate; 221. return air port; 222. air collecting channel; 23. air distribution pipe; 24. annular air bag; 25. sealing plate; 3. pressure regulating device; 31. circulation pump; 32. booster cylinder; 33. blocking plate; 331. flow port; 34. heat exchanger; 4. fan. DETAILED DESCRIPTION

[0036] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0037] The present invention provides a technical solution:

[0038] like Figure 1-2 As shown, a distribution cabinet for a distribution room with a fixed-point heat dissipation function is provided. The distribution cabinet includes a cabinet body 1, a flow guide device 2, a voltage regulating device 3 and a fan 4. The cabinet body 1 is connected to the flow guide device 2, the voltage regulating device 3 is connected to the cabinet body 1, the pressure regulating device 3 and the flow guide device 2 are connected by pipeline, the pressure regulating device 3 is used for internal circulation of gas for cooling, the fan 4 and the cabinet body 1 are tightly connected, a distribution cavity 11 is provided on the cabinet body 1, an air inlet 12 is provided on one side of the distribution cavity 11, and the outlet of the fan 4 and the air inlet 12 are connected by pipeline.

[0039] The cabinet body 1 is used as the main installation basis to install and fix other devices. The distribution cavity 11 provides distribution space. The guide device 2 is used for gas diversion. The incoming air delivered by the fan 4 is automatically screened to prevent the gas with excessive humidity from entering the distribution cavity 11 and causing sparks and short circuits. The heated gas is regulated for internal circulation through the pressure regulating device 3. The internal circulation efficiency is improved by pressure regulation and temperature reduction. The internal circulation and the external fan 4 supply air to improve the cooling efficiency of the electrical components in the distribution cabinet to avoid overheating affecting the distribution quality.

[0040] like Figure 2 to Figure 4 As shown, the air inlet 12 is provided with a contraction channel 121, a straight channel 122 and an expansion channel 123 in sequence along the air supply direction, the contraction channel 121, the straight channel 122 and the expansion channel 123 are connected in sequence, and the fan 4 is connected to the contraction channel 121;

[0041] The flow guide device 2 includes a switching component 21 and an air distribution pipe 23. The switching component 21 includes two electrode sheets 211. The two electrode sheets 211 are arranged along the walls on both sides of the straight channel 122. The two electrode sheets 211 are respectively connected to the two wiring terminals of the power supply. The electrode sheets 211 and the power supply constitute a switching circuit. A wet air channel 14 is provided on one side of the expansion channel 123. The air distribution pipe 23 is arranged along the electrical components in the distribution cavity 11. The end of the expansion channel 123 is connected to the air distribution pipe 23, and the air outlet on the air distribution pipe 23 faces the electrical components.

[0042] The air inlet duct 12 is arranged in three sections, the diameter of the contraction 121 gradually decreases, the diameter of the straight channel 122 remains unchanged, and the diameter of the expansion channel 123 gradually increases. When the airflow pumped by the fan 4 enters the contraction 121, as the diameter decreases, the air density gradually increases. When entering the straight channel 122, the density is the largest. The air humidity is detected by two electrode sheets 211. When the air humidity exceeds the standard value, the switching circuit composed of the electrode sheet 211 and the power supply is turned on, and the airflow is not suitable for being introduced into the distribution cavity 11 for cooling. The airflow is sent into the wet air duct 14 and discharged through the wet air duct 14. When the air humidity is lower than the standard value, it can be used to cool the electrical components. It is sent into the air distribution pipe 23 through the expansion channel 123. The air outlet of the air distribution pipe 23 faces the electrical components. The air flow cools the electrical components. In the low-voltage power distribution process, since the air has a certain humidity and a large specific heat capacity, the amount of heat absorbed increases when the temperature is increased, thereby improving the cooling and heat dissipation efficiency.

[0043] like Figure 4 As shown, the switching assembly 21 also includes an electromagnet 212 and a rotating plate 213. A switching slot 13 is provided on one side of the expansion channel 123. The electromagnet 212 is placed in the switching slot 13. The rotating plate 213 is rotatably connected to the switching slot 13. The rotating plate 213 is made of a magnet. The electromagnet 212 is electrically connected to the switching circuit.

[0044] During switching, the facing ends of the electromagnet 212 and the rotating plate 213 are the same magnetic poles, the end of the rotating plate 213 faces the wet gas channel 14 , and the rotating plate 213 cuts off the expansion channel 123 .

[0045] The switching component 21 is used to switch the intake air flow path. The switching circuit current is sent to the controller, and the controller controls the current size of the input electromagnet 212. When the air humidity is lower than the standard value, the air flow enters the air distribution pipe 23 along the expansion channel 123. When the air humidity exceeds the standard value, the switching circuit is turned on, and the electromagnet 212 is powered by the controller. The electromagnet 212 and the rotating plate 213 have the same magnetic poles. Under the action of the magnetic pole repulsion, the rotating plate 213 rotates upward to partially cut off the expansion channel 123 and face the wet air channel 14. The wet air flow is discharged from the wet air channel 14 to avoid electrical components from igniting due to excessive air humidity.

[0046] like Figure 2 to Figure 6 As shown, the flow guide device 2 also includes an air distribution plate 22 and a circulation pump 31. The air distribution plate 22 and the air distribution pipe 23 are adapted. The air distribution plates 22 and the air distribution pipes 23 of the same group are respectively located on the upper and lower sides of the electrical components. An air return port 221 is provided on the air distribution plate 22. The air return port 221 and the air outlet on the air distribution pipe 23 are adapted. The ends of the air return ports 221 on the same air distribution plate 22 converge into an air collecting duct 222. The inlet of the circulation pump 31 is connected to the air collecting duct 222. An annular air bag 24 is provided in the air return port 221. A plurality of sealing plates 25 are provided in the inner circle of the annular air bag 24. The plurality of sealing plates 25 are fan-shaped. The sealing plates 25 and the air return port 221 are rotatably connected. The rotation center of the sealing plate 25 is located above the contact point between the sealing plate 25 and the annular air bag 24.

[0047] After the gas ejected from the air distribution pipe 23 exchanges heat with the electrical components, the air density decreases and flows upward to enter the return air port 221 of the air distribution plate 22. The annular airbag 24 is filled with compressed gas, which controls the expansion degree of the annular airbag 24 by exchanging heat with the floating gas. When the floating gas is overheated, the instantaneous heat exchange of the annular airbag 24 increases, and the volume expansion increases. Since the outer ring is fixed, it expands inward, driving the lower end of the sealing plate 25 to rotate inward. In the initial state of the sealing plate 25, the upper end is inclined inward. During the inward rotation of the lower end of the sealing plate 25, the upper end opening gradually increases. When the circulating pump 31 is used to pump air, the air flow velocity of the return air port 221 above the electrical components with high heat generation increases. When the air distribution pipe 23 is used for jet heat dissipation, the pressure of the electrical components with fast flow velocity above is reduced. Through the differential pressure, the cold air with slow flow velocity flows to the electrical components with fast flow velocity, thereby assisting the heat dissipation of the high-temperature electrical components and improving the heat dissipation efficiency through fixed-point heat dissipation.

[0048] like Figure 7As shown, the pressure regulating device 3 includes a boosting cylinder 32, a pressure regulating chamber 16 is provided on the cabinet 1, the boosting cylinder 32 is placed in the pressure regulating chamber 16, the output end of the boosting cylinder 32 is in sliding contact with the pressure regulating chamber 16, a heat exchange plate 34 is provided in the pressure regulating chamber 16, and the outlet of the circulating pump 31 is connected to the pressure regulating chamber 16 by a pipeline.

[0049] The output end of the boost cylinder 32 adopts a plate structure, with a sealing gasket on the outside, and is in sealed contact with the wall of the pressure regulating chamber 16, so as to facilitate pressure regulation. When the airflow after heat exchange is sent into the pressure regulating chamber 16 through the circulation pump, the boost cylinder 32 outputs displacement, and when the output end moves along the wall of the pressure regulating chamber 16, the airflow is pressurized. As the pressure increases, the water vapor in the airflow liquefies, and the liquefaction process releases heat, so that the temperature of the gas-liquid mixed phase increases. There are heat exchange fins 34 extending outward in the pressure regulating chamber 16. When the outside atmospheric temperature is constant, the heat exchange efficiency is improved by increasing the temperature difference between the inside and the outside.

[0050] like Figure 7-8 As shown, the pressure regulating device 3 also includes a plugging plate 33, the output end of the boosting cylinder 32 is connected to the plugging plate 33, a flow port 331 is provided on the plugging plate 33, the flow port 331 and the outlet of the pressure regulating chamber 16 are intermittently connected, the outlet of the pressure regulating chamber 16 is connected to the expansion channel 123, a tail flow groove 15 is provided on the outside of the cabinet 1, the tail flow groove 15 is opened upward, and the end of the heat exchange plate 34 away from the pressure regulating chamber 16 is inserted into the tail flow groove 15;

[0051] During heat exchange: the flow port 331 and the outlet of the pressure regulating chamber 16 are not conducting;

[0052] During leakage, the flow port 331 and the outlet of the pressure regulating chamber 16 are connected.

[0053] The movement of the output end of the boost cylinder 32 in the pressure regulating chamber 16 is divided into two processes. In the first process, the water vapor in the airflow is liquefied through space compression, and heat exchange and cooling are carried out through the heat exchange plate 34. In the second process, after the heat exchange is completed, the boost cylinder 32 continues to output displacement until the flow port 331 and the outlet of the pressure regulating chamber 16 are connected. The boost cylinder 32 sends the cooled airflow through the outlet of the pressure regulating chamber 16 into the expansion channel 123. This part of the airflow is pressurized and dehumidified, and heat exchanged and cooled for internal circulation cooling.

[0054] As an optimization, the end of the wet gas channel 14 is connected to the tail flow slot 15. The airflow with high humidity is sent into the tail flow slot 15 through the wet gas channel 14. Within a certain range, the specific heat capacity of the airflow increases with the increase of humidity, so that the airflow in the pressure regulating chamber 16 maintains a high temperature difference state for a long time during the heat exchange process with the external wet airflow through the heat exchange plate 34, thereby improving the heat exchange efficiency.

[0055] As an optimization, the vertical section of the flow port 331 is smaller than the cross-sectional area of ​​the outlet of the pressure regulating chamber 16. Since the vertical section of the flow port 331 is smaller than the outlet section of the pressure regulating chamber 16, an exhaust stroke is formed during the exhaust process, and the exhausted gas is used for internal circulation cooling.

[0056] The working principle of the present invention is as follows: after the airflow pumped by the fan 4 enters the contraction channel 121, as the diameter decreases, the air density gradually increases. When entering the straight channel 122, the density is the largest. The air humidity is detected by two electrode sheets 211. When the air humidity exceeds the standard value, the switching circuit composed of the electrode sheet 211 and the power supply is turned on. The airflow is not suitable for being introduced into the power distribution cavity 11 for cooling. The airflow is sent into the wet air channel 14 and discharged through the wet air channel 14. When the air humidity is lower than the standard value, it can be used to cool the electrical components. It is sent into the air distribution pipe 23 through the expansion channel 123. The air outlet of the air distribution pipe 23 faces the electrical components. The air flow cools the electrical components. In the low-voltage power distribution process, since the air has a certain humidity and a large specific heat capacity, the heat absorption increases when the temperature is raised at the same time, thereby improving the cooling and heat dissipation efficiency. When the air humidity exceeds the standard value, the switching circuit is turned on, and power is supplied to the electromagnet 212 through the controller. The electromagnet 212 and the rotating plate 213 are magnetic poles of the same name. Under the action of the magnetic pole repulsion, the rotating plate 213 rotates upward, partially cuts off the expansion channel 123, and faces the wet air channel 14. The wet air flow is discharged from the wet air channel 14 to avoid ignition of electrical components caused by excessive air humidity; when the floating gas is overheated, the instantaneous heat exchange of the annular air bag 24 increases, and the volume expansion increases. Since the outer ring is fixed, it expands inward, driving the lower end of the sealing plate 25 to rotate inward. In the initial state of the sealing plate 25, the upper end is inclined inward. During the inward rotation of the lower end of the sealing plate 25, the upper end opening gradually increases. When the circulating pump 31 is used to pump air, the air flow velocity of the return air port 221 above the electrical components with high heat generation increases. When the air distribution pipe 23 is used for jet heat dissipation, the pressure of the electrical components with fast flow velocity above is reduced. Through the differential pressure, the cold air with slow flow velocity flows to the electrical components with fast flow velocity, thereby assisting the heat dissipation of the high-temperature electrical components and improving the heat dissipation efficiency through fixed-point heat dissipation.

[0057] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A power distribution cabinet for a power distribution room with a fixed-point heat dissipation function, characterized in that: The power distribution cabinet comprises a cabinet body (1), a flow guide device (2), a pressure regulating device (3) and a fan (4); the cabinet body (1) is connected to the flow guide device (2); the pressure regulating device (3) is connected to the cabinet body (1); the pressure regulating device (3) and the flow guide device (2) are connected by pipeline; the pressure regulating device (3) is used for internal circulation of gas for cooling; the fan (4) and the cabinet body (1) are tightly connected; a power distribution chamber (11) is provided on the cabinet body (1); an air inlet duct (12) is provided on one side of the power distribution chamber (11); and the outlet of the fan (4) and the air inlet duct (12) are connected by pipeline; The air inlet duct (12) is provided with a contraction duct (121), a straight duct (122) and an expansion duct (123) in sequence along the air supply direction; the contraction duct (121), the straight duct (122) and the expansion duct (123) are connected in sequence; and the fan (4) is connected to the contraction duct (121); The flow guide device (2) comprises a switching component (21) and an air distribution pipe (23), the switching component (21) comprising two electrode sheets (211), the two electrode sheets (211) being arranged along the wall surfaces on both sides of the straight channel (122), the two electrode sheets (211) being respectively connected to two wiring terminals of a power supply, the electrode sheets (211) and the power supply forming a switching circuit, a wet air channel (14) being arranged on one side of the expansion channel (123), the air distribution pipe (23) being arranged along the electrical components in the power distribution cavity (11), the end of the expansion channel (123) being connected to the air distribution pipe (23), and the air outlet on the air distribution pipe (23) facing the electrical components; The switching assembly (21) further comprises an electromagnet (212) and a rotating plate (213); a switching slot (13) is provided on one side of the expansion channel (123); the electromagnet (212) is disposed in the switching slot (13); the rotating plate (213) and the switching slot (13) are rotatably connected; the rotating plate (213) is made of a magnetic material; and the electromagnet (212) is electrically connected to the switching circuit; During switching, the facing ends of the electromagnet (212) and the rotating plate (213) are magnetic poles of the same name, the end of the rotating plate (213) faces the wet air passage (14), and the rotating plate (213) cuts off the expansion passage (123).

2. A power distribution cabinet for a power distribution room with a fixed-point heat dissipation function according to claim 1, characterized in that: The flow guide device (2) further comprises an air distribution plate (22) and a circulation pump (31); the air distribution plate (22) and the air distribution pipe (23) are matched; the air distribution plate (22) and the air distribution pipe (23) of the same group are respectively located on the upper and lower sides of the electrical component; the air distribution plate (22) is provided with an air return port (221); the air return port (221) is matched with an air outlet port on the air distribution pipe (23); the air return port (221) on the same air distribution plate (22) The ends converge to form an air collecting passage (222), the inlet of the circulation pump (31) and the air collecting passage (222) are connected, an annular air bag (24) is provided in the air return port (221), a plurality of sealing plates (25) are provided in the inner circle of the annular air bag (24), the plurality of sealing plates (25) are fan-shaped, the sealing plates (25) and the air return port (221) are rotatably connected, and the rotation center of the sealing plates (25) is located above the contact point between the sealing plates (25) and the annular air bag (24).

3. The power distribution cabinet for a power distribution room with a fixed-point heat dissipation function according to claim 2, characterized in that: The pressure regulating device (3) comprises a boosting cylinder (32), a pressure regulating chamber (16) is provided on the cabinet (1), the boosting cylinder (32) is placed in the pressure regulating chamber (16), the output end of the boosting cylinder (32) is in sliding contact with the pressure regulating chamber (16), a heat exchange plate (34) is provided in the pressure regulating chamber (16), and the outlet of the circulation pump (31) and the pressure regulating chamber (16) are connected by a pipeline.

4. The power distribution cabinet for a power distribution room with a fixed-point heat dissipation function according to claim 3, characterized in that: The pressure regulating device (3) further comprises a plugging plate (33), the output end of the boosting cylinder (32) is connected to the plugging plate (33), a flow port (331) is provided on the plugging plate (33), the flow port (331) and the outlet of the pressure regulating chamber (16) are intermittently connected, the outlet of the pressure regulating chamber (16) and the expansion channel (123) are connected, a tail flow groove (15) is provided on the outside of the cabinet (1), the tail flow groove (15) is opened upward, and the end of the heat exchange plate (34) away from the pressure regulating chamber (16) is inserted into the tail flow groove (15); During heat exchange: the flow port (331) and the outlet of the pressure regulating chamber (16) are not connected; During flow leakage: the flow port (331) and the outlet of the pressure regulating chamber (16) are in conduction.

5. The power distribution cabinet for a power distribution room with a fixed-point heat dissipation function according to claim 4, characterized in that: The end of the wet gas channel (14) is in communication with the tail flow groove (15).

6. The power distribution cabinet for a power distribution room with a fixed-point heat dissipation function according to claim 4, characterized in that: The vertical cross-section of the flow port (331) is smaller than the cross-sectional area of ​​the outlet of the pressure regulating chamber (16).

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