Electric appliance cabinet and electric power system

Abstract

The invention provides an electric appliance cabinet and a power system, and belongs to the technical field of electric appliance cabinets. The electric appliance cabinet can perform gas exchange with indoor and outdoor environments, which is helpful for maintaining the balance of pressure in the cabinet. The design of the on-off mechanism allows the first air port to be opened when the pressure intensity value in the containing cavity is smaller than or equal to the preset pressure intensity value, and the first air port to be closed when the pressure intensity value is larger than the preset pressure intensity value. The mechanism can prevent the electric appliance cabinet from being damaged or safety accidents caused by too high internal pressure, and improves the safety of the electric appliance cabinet.

Description

Technical Field

[0001] The present application relates to the technical field of electrical cabinets, and in particular to an electrical cabinet and a power system. Background Art

[0002] Cabinet capacitor devices are commonly used equipment in power systems. Their main functions are to improve power factor, adjust network voltage and reduce line losses.

[0003] The cabinet door plate and the sealing plate of the existing cabinet capacitor device are connected to the frame by bolts or hinges. These plates are made of 1.5mm-2.0mm carbon steel plates and have heat dissipation holes. Therefore, this cabinet capacitor device does not have explosion-proof function.

[0004] During the use of cabinet-type capacitor devices, internal arcing may occur due to condensation, improper operation, etc. The high-temperature and high-pressure gas generated by the internal arcing may cause the cabinet of the capacitor device to explode, resulting in serious consequences such as damage to surrounding power equipment and casualties. Summary of the invention

[0005] The embodiment of the present application provides an electrical cabinet and a power system, which can exchange gas with indoor and outdoor environments by setting a first gas port and a second gas port, which helps to maintain the pressure balance in the cabinet. The design of the on-off mechanism allows the first gas port to be opened when the pressure value in the accommodating chamber is less than or equal to the preset pressure value, and the first gas port to be closed when the pressure value is greater than the preset pressure value. This mechanism can prevent damage to the electrical cabinet or safety accidents caused by excessive internal pressure, thereby improving the safety of the electrical cabinet. Specifically:

[0006] According to a first aspect of an embodiment of the present application, there is provided an electrical cabinet for installation indoors, the electrical cabinet comprising:

[0007] A cabinet body, wherein a receiving cavity for installing electrical components is formed inside the cabinet body, and a first air port and a second air port communicating with the receiving cavity are formed on the surface of the cabinet body, wherein the first air port is connected to an indoor environment, and the second air port is connected to an outdoor environment;

[0008] A first air channel and a second air channel, the first air channel and the first air port are connected to form a first air path, the second air channel and the second air port are connected to form a second air path, and the first air path, the accommodating cavity and the second air path are connected to form a heat dissipation air path;

[0009] The first air duct is provided with an on-off mechanism, which is used to open the first air port when the pressure value in the accommodating chamber is less than or equal to the preset pressure value, and to close the first air port when the pressure value in the accommodating chamber is greater than the preset pressure value, so as to open or close the first air path. The second air duct is provided with a fan, which is used to extract the gas in the accommodating chamber and discharge the extracted gas to the outside through the second air path.

[0010] In the above technical solution, the switchable mechanism includes a moving member arranged in the first air channel, and the moving member can move to a first position when the pressure value in the accommodating chamber is less than or equal to a preset pressure value, and move to a second position when the pressure value in the accommodating chamber is greater than the preset pressure value;

[0011] When the moving part moves to the first position, the first air port is opened to conduct the first air path, and when the moving part moves to the second position, the first air port is closed to disconnect the first air path.

[0012] In the above technical solution, when the pressure value in the accommodating chamber is less than or equal to the preset pressure value, the moving member can move to the first position under the pressure difference between the pressure in the accommodating chamber and the pressure in the chamber;

[0013] When the pressure value in the accommodating chamber is greater than the preset pressure value, the moving member can move to the second position under the pressure difference between the pressure in the accommodating chamber and the pressure in the chamber.

[0014] In the above technical solution, the first air channel includes a first port connected to the accommodating chamber side and a second port connected to the indoor environment side, and the channel cross section of the first air channel is designed to be gradually reduced from the first port side to the second port side;

[0015] The passage mechanism includes a pipe member arranged in the first airway and capable of moving toward the first port side or toward the second port side along the first airway, and when the pipe member moves to a position close to the first port, the first port and the second port can be connected to connect the accommodating chamber with the indoor environment, and when the pipe member moves to a position close to the second port, the connection between the first port and the second port can be disconnected to disconnect the connection between the accommodating chamber and the indoor environment;

[0016] in

[0017] When the pressure value in the accommodating chamber is less than or equal to the preset pressure value, the pipe fitting can move to the first position close to the first port side under the pressure difference between the pressure in the accommodating chamber and the indoor pressure, so as to connect the accommodating chamber with the indoor environment;

[0018] When the pressure value in the accommodating chamber is greater than the preset pressure value, the pipe fitting can move to the second position close to the second port side under the pressure difference between the pressure in the accommodating chamber and the indoor pressure to disconnect the connection between the accommodating chamber and the indoor environment.

[0019] In the above technical solution, the first air channel is an inclined pipe extending obliquely upward, one end of the first air channel extending upward is formed with a first port connected to the accommodating cavity, and one end of the first air channel extending downward is formed with a second port connected to the indoor environment;

[0020] The pipe fitting is a circular hollow tube arranged in the first airway. When the circular hollow tube moves downward to the second position with a narrow channel surface, the outer surface of the hollow tube fits against the inner wall surface of the first airway, so as to disconnect the connection between the accommodating chamber and the indoor environment by blocking the first airway. When the circular hollow tube moves upward to the first position with a wide channel surface, the outer surface of the hollow tube at least partially does not fit against the inner wall surface of the first airway, so as to connect the accommodating chamber and the indoor environment by releasing the blockage of the first airway.

[0021] In the above technical solution, the first air duct and the switchable mechanism provided in the first air duct serve as the indoor air duct components of the electrical cabinet, and the indoor air duct components are provided with two groups;

[0022] Two sets of indoor air duct components are distributed on the left and right sides of the bottom of the electrical cabinet.

[0023] In the above technical solution, a second air port is provided on the top of the cabinet, and a second air duct is provided on the top of the cabinet, one end of the second air duct is connected to the second air port, and the other end of the second air duct is connected to the outdoor environment.

[0024] In the above technical solution, the second air duct comprises a steel trough with openings at the top and sides, a steel cover provided at the top opening of the steel trough, and a flame retardant plate sandwiched between the top opening of the steel trough and the steel cover and sealed by a sealing rubber ring;

[0025] The steel trough, steel cover and flame retardant plate cooperate with each other to define a second air duct with a cabinet connecting port and an outdoor connecting port on the side. The second air duct is connected to the second air port on the top of the cabinet through the cabinet connecting port, and the second air duct is connected to the outdoor environment through the outdoor connecting port.

[0026] In the above technical solution, a door is provided at the front of the cabinet, and the electrical cabinet further comprises a door body hinged at the door;

[0027] The door body includes an outer door body and an inner door body matched with the door opening, and the electrical cabinet is sealed by closing the inner door body and the outer door body.

[0028] In the above technical solution, the electrical cabinet further comprises a sealing plate, which comprises an outer sealing plate and an inner sealing plate;

[0029] The outer sealing plate is connected with the cabinet body by bolts, the inner sealing plate is welded with the cabinet body, and a steel pipe is sandwiched between the outer sealing plate and the inner sealing plate.

[0030] A second aspect of an embodiment of the present application provides a power system, which includes the electrical cabinet provided by the first aspect of an embodiment of the present application.

[0031] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0032] In the embodiment of the present application, by providing the first gas port and the second gas port, the electrical cabinet can exchange gas with the indoor and outdoor environments, which helps to maintain the pressure balance in the cabinet. The design of the on-off mechanism allows the first gas port to be opened when the pressure value in the accommodating chamber is less than or equal to the preset pressure value, and the first gas port to be closed when the pressure value is greater than the preset pressure value. This mechanism can prevent damage to the electrical cabinet or safety accidents caused by excessive internal pressure, thereby improving the safety of the electrical cabinet. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the main structure of the electrical cabinet in the embodiment of the present application;

[0034] Figure 2 This is a schematic diagram of the structure of the first airway in the embodiment of the present application, which shows the open state and the closed state of the first airway;

[0035] Figure 3 This is a schematic diagram of the structure of the second airway in the embodiment of the present application;

[0036] Figure 4 This is a schematic diagram of the structure of the door body in the embodiment of the present application;

[0037] Figure 5 It is a schematic diagram of the structure of the sealing plate in the embodiment of the present application.

[0038] 1-first air channel; 101-pipe fitting; 102-vertical baffle; 103-inclined plate; 104-guide groove;

[0039] 2-second air channel; 201-steel trough; 202-steel cover; 203-flame retardant plate; 2004-sealing rubber ring;

[0040] 3-cabinet body; 301-inner door body; 302-outer door body; 303-inner sealing plate; 304-outer sealing plate; 305-rib;

[0041] 4-Wall. DETAILED DESCRIPTION

[0042] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0043] Throughout the specification and claims, the following terms have at least the meanings explicitly associated herein, unless the context dictates otherwise. The meanings identified below do not necessarily limit the terms, but merely provide illustrative examples of the terms.

[0044] In the description of the present invention, the phrase "in one embodiment" does not necessarily refer to the same embodiment, although it may refer to the same embodiment. Similarly, the phrase "in some embodiments" as used herein, when used multiple times, does not necessarily refer to the same embodiment, although it may refer to the same embodiment. As used herein, the term "or" is an inclusive "or" operator and is equivalent to the term "and / or", unless the context clearly dictates otherwise. The term "based on" is not exclusive and allows for additional factors not described, unless the context clearly dictates otherwise. The word "exemplary" means "used as an example, instance or illustration" in this article. Any embodiment described herein as "exemplary" is not necessarily interpreted as being superior or superior to other embodiments. The scope of the present invention is limited only by the scope of the appended claims, and any examples set forth in this specification are not intended to be limiting, but only to set forth some of the many possible embodiments of the claimed invention. The various embodiments provided by the present invention should not be interpreted as limiting the scope of protection of the present invention.

[0045] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0046] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0047] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0049] Background

[0050] Cabinet capacitor devices are commonly used equipment in power systems. Their main functions are to improve power factor, adjust network voltage and reduce line losses.

[0051] The cabinet door plate and the sealing plate of the existing cabinet capacitor device are connected to the frame by bolts or hinges. These plates are made of 1.5mm-2.0mm carbon steel plates and have heat dissipation holes. Therefore, this cabinet capacitor device does not have explosion-proof function.

[0052] During the use of cabinet-type capacitor devices, internal arcing may occur due to condensation, improper operation, etc. The high-temperature and high-pressure gas generated by the internal arcing may cause the cabinet of the capacitor device to explode, resulting in serious consequences such as damage to surrounding power equipment and casualties.

[0053] Based on this, Figure 1-Figure 5 As shown, in a first aspect of an embodiment of the present application, an electrical cabinet is provided for installation indoors, and the electrical cabinet includes:

[0054] A cabinet 3, wherein a receiving cavity for installing electrical components is formed inside the cabinet 3, and a first air port and a second air port communicating with the receiving cavity are formed on the surface of the cabinet 3, wherein the first air port communicates with an indoor environment, and the second air port communicates with an outdoor environment;

[0055] A first air channel 1 and a second air channel 2, the first air channel 1 and the first air port are connected to form a first air path, the second air channel 2 and the second air port are connected to form a second air path, and the first air path, the accommodating cavity and the second air path are connected to form a heat dissipation air path;

[0056] The first air duct 1 is provided with an on / off mechanism, which is used to open the first air port when the pressure value in the accommodating chamber is less than or equal to the preset pressure value, and to close the first air port when the pressure value in the accommodating chamber is greater than the preset pressure value, so as to open or close the first air path. The second air duct 2 is provided with a fan, which is used to extract the gas in the accommodating chamber and discharge the extracted gas to the outside through the second air path.

[0057] In the embodiment of the present application, by setting the first air port and the second air port, the electrical cabinet can exchange gas with the indoor and outdoor environments, which helps to maintain the balance of pressure in the cabinet. The design of the switchable mechanism allows the first air port to be opened when the pressure value in the accommodating chamber is less than or equal to the preset pressure value, and the first air port is closed when the pressure value is greater than the preset pressure value. This mechanism can prevent damage to the electrical cabinet or safety accidents caused by excessive internal pressure, thereby improving the safety of the electrical cabinet. Through the heat dissipation gas path (first air path, accommodating chamber and second air path) formed, the heat inside the electrical cabinet can be effectively discharged. The fan in the second air duct 2 actively extracts the heat in the accommodating chamber and discharges it to the outside through the second air path. This active heat dissipation method is more efficient than natural convection, and is particularly suitable for electrical components with high heat dissipation requirements. Through effective heat dissipation, the loss of electrical components caused by overheating is reduced, the service life of the electrical cabinet and its internal components is extended, electronic waste is reduced, and it is beneficial to environmental protection. The automatic operation of the switchable mechanism and the fan reduces manual intervention, making the operation of the electrical cabinet easier, and the automatic pressure and temperature control improves the reliability and stability of the electrical cabinet and reduces maintenance costs.

[0058] Further, in some possible implementations, the switchable mechanism includes a moving member disposed in the first air channel 1, and the moving member can move to a first position when the pressure value in the accommodating chamber is less than or equal to a preset pressure value, and move to a second position when the pressure value in the accommodating chamber is greater than the preset pressure value;

[0059] When the moving part moves to the first position, the first air port is opened to conduct the first air path, and when the moving part moves to the second position, the first air port is closed to disconnect the first air path.

[0060] In the embodiment of the present application, the moving part moves to different positions under different pressure conditions, and the precise control of the first air port is realized. This design can automatically adjust the opening and closing of the air circuit according to the real-time pressure value in the accommodating chamber, and improves the accuracy and response speed of pressure control. The automatic movement mechanism of the moving part reduces manual intervention and realizes the automatic management of the air circuit. This automatic operation improves the intelligence level of the electrical cabinet, reduces the complexity of operation, and reduces the risk caused by human operation errors. Specifically, when the pressure value in the accommodating chamber exceeds the preset pressure value, the moving part moves to the second position to close the first air port, which helps to prevent the high-temperature gas from being discharged into the room due to excessive internal pressure. More specifically, the moving part opens the first air port when the pressure value is less than or equal to the preset pressure value, allowing natural convection heat dissipation, reducing the running time of the fan, thereby saving energy consumption. That is, the electrical cabinet in the embodiment of the present application can automatically adjust the air circuit according to the internal pressure, so that it can adapt to different indoor environmental conditions and keep the stability of the internal environment, which is very important for the stable operation of the electrical cabinet under different environments.

[0061] Further, in some possible implementations, when the pressure value in the accommodation chamber is less than or equal to the preset pressure value, the moving element can move to the first position under the pressure difference between the pressure in the accommodation chamber and the pressure in the chamber;

[0062] When the pressure value in the accommodating chamber is greater than the preset pressure value, the moving member can move to the second position under the pressure difference between the pressure in the accommodating chamber and the pressure in the chamber.

[0063] In the implementation of the present application, the movement of the moving part is completely dependent on the pressure difference between the pressure in the accommodating chamber and the indoor pressure, and no additional energy or control system is required to drive it, thereby realizing a passive pressure response mechanism. Since the movement of the moving part is directly driven by the pressure difference, this reduces the need for complex mechanical or electronic control systems and simplifies the design and manufacture of the electrical cabinet. The moving part directly responds to the change in pressure difference and can quickly move to the first position or the second position, thereby improving the response speed of the electrical cabinet to the change in internal pressure. Specifically, when the pressure value in the accommodating chamber exceeds the preset pressure value, the moving part quickly moves to the second position to close the first air port. This rapid response helps to prevent safety accidents caused by excessive internal pressure and prevents the high-temperature and high-pressure airflow in the accommodating chamber from flowing into the room through the first air port.

[0064] Further, in some possible implementations, the first air channel 1 includes a first port connected to the accommodating chamber side, and a second port connected to the indoor environment side, and the channel cross section of the first air channel 1 is designed to be tapered from the first port side to the second port side;

[0065] The passage mechanism includes a pipe 101 disposed in the first airway 1 and capable of moving toward the first port side or toward the second port side along the first airway 1. When the pipe 101 moves to a position close to the first port, the first port and the second port can be connected to connect the accommodating chamber with the indoor environment. When the pipe 101 moves to a position close to the second port, the connection between the first port and the second port can be disconnected to disconnect the connection between the accommodating chamber and the indoor environment.

[0066] in

[0067] When the pressure value in the accommodating chamber is less than or equal to the preset pressure value, the pipe 101 can move to the first position close to the first port side under the pressure difference between the pressure in the accommodating chamber and the indoor pressure, so as to connect the accommodating chamber with the indoor environment;

[0068] When the pressure value in the accommodating chamber is greater than the preset pressure value, the pipe 101 can move to the second position close to the second port side under the pressure difference between the pressure in the accommodating chamber and the indoor pressure to disconnect the connection between the accommodating chamber and the indoor environment.

[0069] The tapered design of the first air channel 1 in the embodiment of the present application helps to more effectively control the flow of gas under the action of pressure difference. By moving the pipe 101 in the first air channel 1, flexible control of the first air path is achieved. The movement of the pipe 101 can be automatically performed according to the pressure difference inside and outside the accommodating chamber, without the need for an additional control mechanism. When the pressure value in the accommodating chamber is less than or equal to the preset pressure value, the pipe 101 moves to the first position, connecting the first port and the second port, allowing gas to flow to balance the pressure. This helps to maintain the pressure inside the electrical cabinet stable. When the pressure value in the accommodating chamber is greater than the preset pressure value, the pipe 101 moves to the second position, disconnecting the connection between the first port and the second port, preventing the high-temperature and high-pressure airflow from entering the room while allowing the high-temperature and high-pressure airflow to flow outdoors, thereby balancing the internal pressure of the cabinet 3 while avoiding large fluctuations in indoor temperature.

[0070] Further, in some possible embodiments, the first air channel 1 is an inclined pipe extending obliquely upward, and one end of the first air channel 1 extending upward is formed with a first port connected to the accommodating cavity, and one end of the first air channel 1 extending downward is formed with a second port connected to the indoor environment;

[0071] The pipe fitting 101 is a circular hollow tube arranged in the first air channel 1. When the circular hollow tube moves downward to the second position with a narrow channel surface, the outer surface of the hollow tube is in contact with the inner wall surface of the first air channel 1, so as to disconnect the connection between the accommodating cavity and the indoor environment by blocking the first air channel 1. When the circular hollow tube moves upward to the first position with a wide channel surface, the outer surface of the hollow tube is at least partially not in contact with the inner wall surface of the first air channel 1, so as to connect the accommodating cavity and the indoor environment by releasing the blockage of the first air channel 1.

[0072] The inclined upward extension design of the first air channel 1 in the embodiment of the present application helps to utilize gravity to assist the gas flow, especially when the pipe 101 moves to the second position, the gas flow is naturally blocked, which helps to quickly disconnect the connection between the accommodating chamber and the indoor environment. The circular hollow tube is simple in design and easy to manufacture and maintain. It moves up and down in the first air channel 1, and controls the air path by blocking or unblocking. This mechanism is simple and efficient. When the pressure value in the accommodating chamber is greater than the preset pressure value, the circular hollow tube moves downward to the second position, blocking the first air channel 1, thereby preventing excessive pressure from causing damage to the electrical cabinet. When the pressure value is less than or equal to the preset pressure value, the hollow tube moves upward to the first position, unblocks, and allows gas to flow to balance the pressure. When the circular hollow tube is in the second position, its outer surface is in contact with the inner wall of the first air duct 1, providing a good seal to ensure that the connection between the accommodating cavity and the indoor environment is completely disconnected when needed. When the circular hollow tube is in the first position, its outer surface is at least partially not in contact with the inner wall of the first air duct 1, which can reduce the resistance to gas flow and improve airflow efficiency.

[0073] Further, in some possible implementations, the first air duct 1 and the switchable mechanism provided in the first air duct 1 serve as indoor air duct components of the electrical cabinet, and the indoor air duct components are provided with two groups;

[0074] Two sets of indoor air duct components are distributed on the left and right sides of the bottom of the electrical cabinet.

[0075] In the embodiment of the present application, by arranging a group of indoor side air duct components on the left and right sides of the bottom of the electrical cabinet, the symmetry of the electrical cabinet design is achieved, which helps to maintain the balance and stability of the overall structure of the electrical cabinet. The two groups of indoor side air duct components can work at the same time, increasing the number of heat dissipation channels, thereby improving the heat dissipation efficiency of the electrical cabinet, which is particularly important for high-power or high-density installed electrical components. The two groups of indoor side air duct components can work independently or collaboratively to more flexibly control the pressure inside the electrical cabinet and enhance the adaptability to different working conditions. If one group of indoor side air duct components fails, the other group can continue to work. This redundant design improves the reliability and fault tolerance of the electrical cabinet. And the distribution of the two groups of indoor side air duct components helps to distribute the airflow more evenly, reduce local hot spots, and improve the uniformity of the temperature inside the electrical cabinet.

[0076] Specifically, in some possible implementations, such as Figure 1 and Figure 2 As shown, the indoor air duct assembly is installed at the bottom of the cabinet 3, with one set on each side, which includes a lightweight pipe 101, a vertical baffle 102, an inclined plate 103, and a guide groove 104. The fan starts to extract the air inside the cabinet 3, and the air pressure inside the cabinet gradually decreases. When the pressure difference between the inside and outside is large enough, the above-mentioned lightweight pipe 101 will move upward along the guide groove 104, and the air inlet will open. When an arc fault occurs inside the cabinet 3, the internal pressure of the cabinet 3 will increase and exceed the preset pressure value. At this time, the lightweight pipe 101 moves down and contacts the vertical baffle 102 to close the air inlet, preventing the high-temperature and high-pressure airflow inside the cabinet 3 from entering the room.

[0077] Furthermore, in some possible implementations, a second air port is provided on the top of the cabinet 3 , and the second air duct 2 is provided on the top of the cabinet 3 , with one end thereof connected to the second air port and the other end connected to the outdoor environment.

[0078] In the embodiment of the present application, by setting the second air duct 2 at the top of the cabinet 3, it helps the hot air to rise and be naturally discharged from the top, utilizing the natural convection principle of hot air rising, and optimizing the heat dissipation path. The hot air rises from the inside of the electrical cabinet to the top and is discharged to the outside through the second air duct 2. This vertical heat dissipation layout helps to improve the overall heat dissipation efficiency. The second air duct 2 is directly connected to the outdoor environment, which can effectively prevent the exhausted hot air from flowing back into the room, avoiding overheating inside the electrical cabinet or the surrounding environment.

[0079] Further, in some possible embodiments, the second air channel 2 includes a steel trough 201 with openings at the top and sides, a steel cover 202 covering the top opening of the steel trough 201, and a flame retardant plate 203 sandwiched between the top opening of the steel trough 201 and the steel cover and sealed by a sealing rubber ring 204;

[0080] The steel trough 201, the steel cover 202 and the flame retardant plate 203 cooperate with each other to define a second air duct 2 with a cabinet 3 connecting port and an outdoor connecting port on the side. The second air duct 2 is connected to the second air port on the top of the cabinet 3 through the cabinet 3 connecting port, and the second air duct 2 is connected to the outdoor environment through the outdoor connecting port.

[0081] The design of using steel trough 201 and steel cover 202 in the embodiment of the present application provides high strength and stability of the second airway 2 of the electrical cabinet, and the steel material has good durability and corrosion resistance, and is suitable for long-term use. The use of flame retardant plate 203 ensures that when a fire occurs inside the electrical cabinet, the flame and high temperature will not spread to the outside through the second airway 2, thereby improving the fire safety of the electrical cabinet. The sealing between steel trough 201, steel cover 202 and flame retardant plate 203 is achieved by sealing rubber ring 204, which can prevent gas leakage, ensure the sealing of the second airway 2, and also prevent the external environment (such as rainwater, dust) from entering the cabinet 3. The combined design of steel trough 201, steel cover 202 and flame retardant plate 203 is convenient for installation and maintenance work, because these components can be disassembled and replaced separately, without the need to make large-scale changes to the entire electrical cabinet. The second airway 2 is connected to the outdoor environment through the outdoor connecting port, ensuring that the hot air inside the electrical cabinet can be directly discharged to the outside, thereby improving the heat dissipation efficiency.

[0082] Specifically, in some possible implementations, such as Figure 3 As shown, the second airway 2 (i.e., the pressure relief channel) is installed on the top of the cabinet 3, one end of which is connected to the cabinet 3, and the other end passes through the wall to communicate with the outdoor atmosphere. It is the channel for the hot air flow to flow to the air during heat dissipation, and it is also the channel for the high-temperature and high-pressure gas to be discharged outside the cabinet when an arc fault occurs inside the cabinet 3. Therefore, it must have a certain degree of airtightness and fire resistance. Based on this, the second airway 2 in the embodiment of the present application is composed of a steel groove 201, a steel cover 202; a plastic flame retardant plate 203 and a flame retardant sealing rubber ring 204.

[0083] Further, in some possible implementations, a door is provided at the front of the cabinet 3, and the electrical cabinet further comprises a door body hinged at the door;

[0084] The door body includes an outer door body 302 and an inner door body 301 which cooperate with the door opening, and the electrical cabinet is sealed by closing the inner door body 301 and the outer door body 302.

[0085] It is worth noting that the electrical cabinet in the embodiment of the present application is preferably an explosion-proof electrical cabinet, and its cabinet body 3 is different from the ordinary cabinet body 3, and it must maintain airtightness and sufficient strength. Figure 4 As shown, the door bodies in the embodiments of the present application all adopt a two-door structure including an outer door body 302 and an inner door body 301. Preferably, the inner door body 301 is made of 2mm thin steel plate, one side is fixed with five hinges, the other side is fixed with five screws, and a sealing rubber ring 204 is installed on the door, and the outer door body 302 is also made of 2mm thin steel plate, one side is fixed with five hinges, and the other side is fixed with an electromagnetic lock and a ceiling lock.

[0086] Furthermore, in some possible implementations, the electrical cabinet further includes a sealing plate, and the sealing plate includes an outer sealing plate 304 and an inner sealing plate 303;

[0087] The outer sealing plate 304 is connected to the cabinet body 3 by bolts, the inner sealing plate 303 is welded to the cabinet body 3 , and a steel pipe is sandwiched between the outer sealing plate 304 and the inner sealing plate 303 .

[0088] Specifically, Figure 5 As shown, the sealing plate adopts a double-layer sealing plate structure including an outer sealing plate 304 and an inner sealing plate 303, wherein the inner sealing plate 303 is fully welded to the cabinet 3 column, and the outer sealing plate 304 is bolted to the cabinet 3, and the inner and outer sealing plates 304 are sandwiched with ribs 305 composed of square steel pipes, and the mesh size of the ribs 305 should be less than 50cm.

[0089] In summary, the electrical cabinet in the embodiment of the present application can have explosion-proof functions on the basis of satisfying the ventilation and heat dissipation functions, fully improving the level of protection for the personal safety of personnel near the operating equipment. At the same time, the electrical cabinet provided in the implementation of the present application meets the IAC-level AFLR internal arc test of "IEC62271-200 AC metal-enclosed switchgear and control equipment with rated voltage of 1kV and above and 52kV and below", which solves the defect of low or even insufficient internal arc level of cabinet capacitors, and increases its internal arc level to 31.5kA / 1s.

[0090] Furthermore, the second aspect of the embodiment of the present application also provides a power system, which includes the electrical cabinet provided by the first aspect of the embodiment of the present application.

[0091] In the above-mentioned embodiments of the present application, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments. The steps shown in the relevant flow chart can be executed in a computer system such as a set of computer executable instructions, and although the logical order is shown in the flow chart, in some cases, the steps shown or described can be executed in an order different from that here. In other words, the order of steps described in the foregoing embodiments is only an example, and it is also within the scope of protection of the embodiments of the present application to reasonably adjust the order of steps based on the content of the embodiments of the present application.

[0092] The sequence of serial numbers or introduction of the embodiments of the present application is for description only and does not represent the superiority or inferiority of the embodiments.

[0093] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction 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 example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0094] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. An electrical cabinet for installation indoors, characterized in that: The electrical cabinet comprises: A cabinet (3), wherein the cabinet (3) has a receiving cavity for installing electrical components formed therein, and a first air port and a second air port connected to the receiving cavity formed on the surface, wherein the first air port is connected to an indoor environment, and the second air port is connected to an outdoor environment; A first air channel (1) and a second air channel (2), wherein the first air channel (1) and the first air port are connected to form a first air path, the second air channel (2) and the second air port are connected to form a second air path, and the first air path, the accommodating cavity and the second air path are connected to form a heat dissipation air path; The first air duct (1) is provided with an on / off mechanism, which is used to open the first air port when the pressure value in the accommodating chamber is less than or equal to a preset pressure value, and to close the first air port when the pressure value in the accommodating chamber is greater than the preset pressure value, so as to open or close the first air path, and the second air duct (2) is provided with a fan, which is used to extract the gas in the accommodating chamber and discharge the extracted gas to the outside through the second air path.

2. The electrical cabinet according to claim 1, characterized in that: The switchable mechanism comprises a moving part arranged in the first air passage (1), the moving part being capable of moving to a first position when the pressure value in the accommodating chamber is less than or equal to a preset pressure value, and moving to a second position when the pressure value in the accommodating chamber is greater than the preset pressure value; When the moving member moves to the first position, the first air port is opened to connect the first air path, and when the moving member moves to the second position, the first air port is closed to disconnect the first air path.

3. The electrical cabinet according to claim 2, characterized in that: When the pressure value in the accommodating chamber is less than or equal to the preset pressure value, the moving element can move to the first position under the pressure difference between the pressure in the accommodating chamber and the pressure in the chamber; When the pressure value in the accommodating chamber is greater than a preset pressure value, the moving member can move to the second position under the pressure difference between the pressure in the accommodating chamber and the pressure in the chamber.

4. The electrical cabinet according to any one of claims 1 to 3, characterized in that: The first air channel (1) comprises a first port connected to the accommodating chamber side, and a second port connected to the indoor environment side, and a channel cross section of the first air channel (1) is designed to be gradually reduced from the first port side to the second port side; The channel mechanism comprises a pipe (101) arranged in the first airway (1) and capable of moving along the first airway (1) toward the first port side or toward the second port side; when the pipe (101) moves to a position close to the first port, the first port and the second port can be connected to each other, so as to connect the accommodating chamber with the indoor environment; when the pipe (101) moves to a position close to the second port, the first port and the second port can be disconnected from each other, so as to disconnect the accommodating chamber with the indoor environment; in When the pressure value in the accommodating chamber is less than or equal to a preset pressure value, the pipe (101) can move to a first position close to the first port side under the pressure difference between the pressure in the accommodating chamber and the indoor pressure, so that the accommodating chamber is connected to the indoor environment; When the pressure value in the accommodating chamber is greater than a preset pressure value, the pipe (101) can move to a second position close to the second port side under the pressure difference between the pressure in the accommodating chamber and the indoor pressure, so as to disconnect the connection between the accommodating chamber and the indoor environment.

5. The electrical cabinet according to claim 4, characterized in that: The first air channel (1) is an inclined pipe extending obliquely upward, one end of the first air channel (1) extending upward is formed with the first port connected to the accommodating cavity, and one end of the first air channel (1) extending downward is formed with the second port connected to the indoor environment; The pipe (101) is a circular hollow tube arranged in the first air channel (1). When the circular hollow tube moves downward to the second position with a narrow channel surface, the outer surface of the hollow tube fits against the inner wall surface of the first air channel (1), so as to disconnect the connection between the accommodating cavity and the indoor environment by blocking the first air channel (1). When the circular hollow tube moves upward to the first position with a wide channel surface, the outer surface of the hollow tube at least partially does not fit against the inner wall surface of the first air channel (1), so as to connect the accommodating cavity and the indoor environment by releasing the blockage of the first air channel (1).

6. The electrical cabinet according to claim 1, characterized in that: The first air duct (1) and the switchable mechanism provided in the first air duct (1) serve as an indoor air duct component of the electrical cabinet, and the indoor air duct component is provided with two groups; Two groups of the indoor air duct components are distributed on the left and right sides of the bottom of the electrical cabinet.

7. The electrical cabinet according to claim 1, characterized in that: The second air port is provided on the top of the cabinet (3); the second air duct (2) is arranged on the top of the cabinet (3), one end of the second air duct is connected to the second air port, and the other end of the second air duct is connected to the outdoor environment.

8. The electrical cabinet according to claim 7, characterized in that: The second air channel (2) comprises a steel trough (201) having openings at the top and sides, a steel cover (202) arranged at the top opening of the steel trough (201), and a flame retardant plate (203) sandwiched between the top opening of the steel trough (201) and the steel cover and sealed by a sealing rubber ring (204); The steel trough (201), the steel cover (202) and the flame retardant plate (203) cooperate with each other to define the second air duct (2) having a cabinet (3) connecting port and an outdoor connecting port on the side. The second air duct (2) is connected to the second air port on the top of the cabinet (3) through the cabinet (3) connecting port, and the second air duct (2) is connected to the outdoor environment through the outdoor connecting port.

9. The electrical cabinet according to claim 1, characterized in that: The front of the cabinet (3) is provided with a doorway, and the electrical cabinet further comprises a door body hinged at the doorway; The door body comprises an outer door body (302) and an inner door body (301) matched with the door opening, and the electrical cabinet is sealed by closing the inner door body (301) and the outer door body (302).

10. The electrical cabinet according to claim 1, characterized in that: The electrical cabinet further comprises a sealing plate, wherein the sealing plate comprises an outer sealing plate (304) and an inner sealing plate (303); The outer sealing plate (304) is bolted to the cabinet body (3), the inner sealing plate (303) is welded to the cabinet body (3), and a steel pipe is sandwiched between the outer sealing plate (304) and the inner sealing plate (303).

11. A power system, characterized in that: The invention comprises the electrical cabinet according to any one of claims 1 to 10.

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