A switch cabinet convenient for pulling out and overhauling

Abstract

The present invention relates to the technical field of distribution cabinets, and discloses a switch cabinet that is convenient for pulling out and overhauling, including: a longitudinal heat dissipation channel is arranged at the center of the outer shell, and a plurality of pull-out cavities are distributed on the left and right sides centered on the heat dissipation channel. A gas channel is arranged between the pull-out cavity and the heat dissipation channel. A thermal magnetic release, an elastic pushing element and a blocking unit are arranged in the pull-out cavity. A thermal magnetic release and an elastic pushing element are arranged between the pull-out cavity and the pull-out box. The blocking unit is arranged on the pull-out box. When the pull-out box is separated from the pull-out cavity, the blocking unit blocks the gas channel. When the electrical components in a certain pull-out box of the switch cabinet are heated and at a high temperature, the thermal magnetic release senses the temperature change and immediately trips. The pull-out box is separated from the pull-out cavity under the thrust of the elastic pushing member, and the pull-out box drives the blocking unit to move to block the gas channel, cutting off the gas connection between the high-temperature abnormal unit and the inner cavity of the switch cabinet.

Description

Technical Field

[0001] The present invention belongs to the technical field related to distribution cabinets, and more specifically, particularly relates to a switch cabinet that is convenient for pulling out and overhauling. Background Art

[0002] Distribution cabinets are usually classified into power distribution cabinets, metering distribution cabinets, lighting distribution cabinets, and terminal switch cabinets according to the usage scenarios, and are mainly used for the distribution and transportation of electric power.

[0003] A distribution cabinet is usually a closed box body, and brackets for installing various switches are fixedly arranged inside it. In order to make the wiring reasonable, a large amount of space usually needs to be reserved to facilitate the operation and maintenance of operators. When a short circuit or overload occurs, a large amount of heat will be generated inside the distribution cabinet, which is likely to cause a fire. And there are still the following defects in the existing technology for distribution cabinets:

[0004] 1. In order to facilitate the overhaul of operators, there is a pull-out type of distribution cabinet in the existing distribution cabinets. However, due to a large amount of space reserved inside, its occupied volume is relatively large. But if the internal reserved space is reduced, it will increase the difficulty of heat dissipation. Therefore, how to balance the contradiction between the two is the technical problem we need to solve.

[0005] 2. The existing heat dissipation structure of the distribution cabinet usually opens several heat dissipation holes on it to enable the exchange of external air and internal air. In order to increase the speed of heat exchange, a heat dissipation fan is usually configured for the distribution cabinet, and an external low-temperature environment is configured for the distribution cabinet. However, since the internal heat dissipation space of the distribution cabinet does not have a well-designed heat dissipation flow channel, it cannot evenly and comprehensively dissipate heat from the internal circuit, and it is easy to cause local overheating.

[0006] 3. The existing distribution cabinet does not design a fire isolation device. When a fire occurs in one of the units inside the distribution cabinet, since it cannot actively isolate itself, it is easy to cause the entire distribution cabinet to catch fire, resulting in greater losses.

[0007] Therefore, in view of this, research and improvement are carried out on the existing structure and deficiencies, and a switch cabinet that is convenient for pulling out and overhauling is provided, in order to achieve a more practical value purpose. Summary of the Invention

[0008] The present invention provides a switch cabinet that is convenient for pulling out and overhauling to overcome the above-mentioned defects in the prior art.

[0009] The purpose and effect of a switch cabinet that is convenient for pulling out and overhauling according to the present invention are achieved by the following specific technical means:

[0010] A switch cabinet convenient for pulling out and overhauling, comprising a housing, the housing having a plurality of pulling cavities, a pulling box slidably arranged in the pulling cavities, a longitudinal heat dissipation channel arranged at the center of the housing, and a plurality of the pulling cavities distributed on the left and right sides centered on the heat dissipation channel. A gas channel is arranged between the pulling cavity and the heat dissipation channel. A thermal magnetic release, an elastic pushing element and a blocking unit are arranged in the pulling cavity. The thermal magnetic release and the elastic pushing element are arranged between the pulling cavity and the pulling box. When the pulling box is separated from the pulling cavity, the blocking unit blocks the gas channel.

[0011] A further technical solution, the switch cabinet further comprises a high-pressure gas storage tank, a jetting unit and a thermal sensing unit. The high-pressure gas storage tank is connected to the jetting unit through a pipeline. The thermal sensing unit is arranged in the pulling box and electrically connected to the jetting unit. The jetting unit is installed at the center of the upper opening of the heat dissipation channel.

[0012] A further technical solution, the switch cabinet further comprises an inert gas storage tank and a magnetic control valve connected to the inert gas storage tank. The air outlet of the magnetic control valve communicates with the inner cavity of the housing. The thermal sensing unit is electrically connected to the magnetic control valve.

[0013] A further technical solution, the elastic pushing element comprises a blocking airbag and a thorn mechanism. The blocking airbag is filled with inert gas inside. The blocking airbag is installed in the pulling cavity. The thorn mechanism is installed on the inner wall of the pulling cavity. There is an elastic telescopic needle and a thermal magnetic snap switch in the thorn mechanism facing the blocking airbag. The thermal magnetic snap switch restricts the elongation of the elastic telescopic needle.

[0014] A further technical solution, an exhaust opening communicating with the heat dissipation channel is opened at one end of the pulling cavity close to the heat dissipation channel, and an air inlet opening communicating with the inner cavity of the housing is opened at one end of the pulling cavity far from the heat dissipation channel. Gas enters the heat dissipation channel from the air inlet opening through the exhaust opening to form a first heat dissipation flow path flowing from the outside to the inside.

[0015] A further technical solution, the blocking unit comprises a first blocking plate, an elastic resetting member and a locking device. The first blocking plate is connected to the pulling box and is arranged opposite to the air inlet opening. The first blocking plate blocks or opens the air inlet opening. The locking device is installed on the housing and locks or opens the pulling box. The elastic resetting member connects the pulling box and the inner wall of the pulling cavity.

[0016] Further technical solution: A cold air outlet is also provided at the bottom of the housing. A cooling fan is rotatably arranged in the heat dissipation channel, and a high-flow low-pressure area is formed in the heat dissipation channel. The cold air at the bottom sequentially passes through the cold air outlet, the air inlet opening, the exhaust opening, and the heat dissipation channel to form a second heat dissipation flow path from bottom to top.

[0017] Further technical solution: A first switch member and a second switch member are also provided on the housing. The first switch member is arranged at the upper end of the housing and blocks or opens the opening at the upper end of the heat dissipation channel. The second switch member is arranged at the bottom of the housing and blocks or opens the opening at the lower end of the heat dissipation channel.

[0018] Further technical solution: The first switch member includes a shielding plate, a bracket, a first elastic member, and a first telescopic rod. The lower end surface of the shielding plate is a downwardly convex conical surface. The shielding plate blocks the opening at the upper end of the heat dissipation channel. The lower side of the shielding plate is connected to the bracket. The bracket is slidably connected to the housing up and down. The first elastic member is connected to the housing and the bracket and provides a downward elastic force for the first elastic member. The first telescopic rod is installed on the housing and abuts against the shielding plate upward.

[0019] Further technical solution: The second switch member includes a bottom plate, a connecting frame, a second elastic member, and a second telescopic rod. The upper side of the bottom plate is connected to the connecting frame. The connecting frame is connected to the housing and slides up and down on the housing. The second elastic member is connected to the connecting frame and the housing and provides an upward elastic force for the connecting frame. The second telescopic rod is arranged on the housing and pushes the bottom plate downward.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] In a switch cabinet that is convenient for pulling out and overhauling in the present application, a longitudinal heat dissipation channel is provided in the center, and the pulling chambers are distributed on both sides of the heat dissipation channel. The heat generated inside the pulling chambers is transferred to the air, and the hot air naturally flows upward through the central heat dissipation channel. The cold air at the bottom of the switch cabinet is sucked into the heat dissipation channel, realizing the function of central heat dissipation. This kind of structure has higher heat dissipation efficiency, and the space required for heat dissipation can be reduced. On the premise of ensuring the heat dissipation effect, the volume of the device can be further reduced.

[0022] When the electrical components in a certain pulling box of the switch cabinet become hot and high-temperature, the thermal magnetic release in the pulling box senses the temperature change and immediately trips. The pulling box is pushed out of the pulling chamber under the thrust of the elastic pushing member, and the pulling box drives the blocking unit to move to block the gas channel, cutting off the gas connection between the high-temperature abnormal unit and the inner cavity of the switch cabinet, reducing the secondary damage caused by the high-temperature abnormal unit to other circuits in the switch cabinet, and having the effect of actively isolating the ignition point.

[0023] A switch cabinet convenient for pulling out and overhauling in the present application has a conventional heat dissipation mode. Both the first switch component and the second switch component are turned on, the fan in the heat dissipation channel rotates, the cold air at the bottom enters the inner cavity of the housing through the bottom opening of the heat dissipation channel and the cold air port respectively, and due to a certain flow rate in the heat dissipation channel, a low-pressure area is formed in the heat dissipation channel. The cold air stored in the inner cavity of the housing enters the pulling cavity, uniformly and comprehensively cools and dissipates heat from the pulling box inside the pulling cavity and the circuits and components installed on the pulling box. The cold air becomes hot and enters the heat dissipation channel, and is discharged upward.

[0024] A switch cabinet convenient for pulling out and overhauling in the present application has an active isolation mode. When a fire point appears locally in the switch cabinet, the thermal magnetic release in the relevant pulling box senses the temperature change and immediately trips. The pulling box disengages from the pulling cavity under the thrust of the elastic pushing member, and the pulling box drives the blocking unit to move to block the gas channel, cutting off the gas connection between the high-temperature abnormal unit and the inner cavity of the switch cabinet, and reducing the secondary damage caused by the high-temperature abnormal unit to other circuits in the switch cabinet. Description of the Drawings

[0025] Figure 1 is the overall structural schematic diagram of the present invention;

[0026] Figure 2 is the front structural schematic diagram of the present invention;

[0027] Figure 3 is the longitudinal sectional view of the present invention;

[0028] Figure 4 is the enlarged structural schematic diagram of the pulling cavity 12 in the present invention;

[0029] Figure 5 is the enlarged structural schematic diagram of the pulling box 13 in the present invention;

[0030] Figure 6 is the structural schematic diagram of the first switch component 30 in the present invention;

[0031] Figure 7 is the structural schematic diagram of the second switch component 31 in the present invention.

[0032] Description of the Reference Numerals:

[0033] 11 housing, 12 draw cavity, 13 draw box, 14 heat dissipation channel, 16 thermal magnetic release, 18 blocking unit, 19 high-pressure gas storage tank, 20 jet unit, 22 inert gas storage tank, 23 magnetic control valve, 24 exhaust opening, 25 intake opening, 26 first blocking plate, 27 elastic reset member, 29 cold air port, 30 first switch member, 31 second switch member, 32 baffle plate, 33 support, 34 first elastic member, 35 first telescopic rod, 36 conical surface, 37 bottom plate, 38 connecting frame, 39 second elastic member, 40 second telescopic rod, 41 second blocking plate. Detailed implementation manner

[0034] The following further describes the implementation manner of the present invention in detail in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0035] In the description of the present invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0036] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "connected" 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 directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] Embodiment:

[0038] As shown in the attached Figure 1 to the attached Figure 7 figure:

[0039] The present invention provides a switch cabinet that is convenient for drawing and overhauling. Refer to the attached Figure 1 to the attached Figure 7, including a housing 11 which has a number of drawer cavities 12. A drawer box 13 is slidably arranged in the drawer cavity 12. A longitudinal heat dissipation channel 14 is provided at the center of the housing 11. A number of drawer cavities 12 are distributed on the left and right sides centered on the heat dissipation channel 14. A gas channel is provided between the drawer cavity 12 and the heat dissipation channel 14. A thermal magnetic release 16, an elastic ejection element and a blocking unit 18 are arranged in the drawer cavity 12. A thermal magnetic release 16 and an elastic ejection element are arranged between the drawer cavity 12 and the drawer box 13. When the drawer box 13 is detached from the drawer cavity 12, the blocking unit 18 blocks the gas channel.

[0040] As Figure 3 shown, in this embodiment, the heat generated inside the switch cabinet is transferred to the air. The hot air naturally flows upward through the central heat dissipation channel 14. The cold air at the bottom of the switch cabinet is sucked into the heat dissipation channel 14, so that the heat dissipation space is concentrated at the center. The drawer cavities on the left and right sides share the heat dissipation space. This structure has a higher heat dissipation efficiency. Therefore, the space required for heat dissipation can be reduced. On the premise of ensuring the heat dissipation effect, the volume of the device can be further reduced; As Figure 4 shown, in addition, when the electrical components in a certain drawer box 13 inside the switch cabinet get hot or reach a high temperature, the thermal magnetic release 16 in the drawer box 13 senses the temperature change and immediately trips. The drawer box 13 is detached from the drawer cavity 12 under the thrust of the elastic ejector, and the drawer box 13 drives the blocking unit 18 to move to block the gas channel, cutting off the gas connection between the high-temperature abnormal unit and the inner cavity of the switch cabinet, and reducing the secondary damage caused by the high-temperature abnormal unit to other circuits in the switch cabinet.

[0041] As Figure 3 shown, preferably, the switch cabinet further includes a high-pressure gas storage tank 19, a jet unit 20 and a heat sensing unit. The high-pressure gas storage tank 19 is connected to the jet unit 20 through a pipeline. The heat sensing unit is arranged in the drawer box 13 and is electrically connected to the jet unit 20. The jet unit 20 is installed at the center of the upper opening of the heat dissipation channel 14.

[0042] In this embodiment, the jet unit 20 includes a jet nozzle, a switch valve and a processing unit. The processing unit receives the electrical signal from the heat sensing unit. When the external temperature is too high and exceeds the set value, the processing unit opens the switch valve, and the high-pressure gas is ejected from the storage tank through the jet nozzle to form a high-velocity air flow, and a negative pressure area is formed at the upper opening of the heat dissipation channel 14 to attract the high-temperature gas in the heat dissipation channel 14 to be quickly discharged to the outside.

[0043] As Figure 3 shown, preferably, the switch cabinet further includes an inert gas storage tank 22 and a magnetically controlled valve 23 connected to the inert gas storage tank 22. The air outlet of the magnetically controlled valve 23 is communicated with the inner cavity of the housing 11. The heat sensing unit is electrically connected to the magnetically controlled valve 23.

[0044] In this embodiment, when the temperature inside the switch cabinet exceeds the set value, the thermal induction unit controls the magnetic control valve 23 to open the valve, and the inert gas smoothly enters the inner cavity of the housing 11. The inert gas discharges the air to the outside to block the internal combustibles and achieve the effect of flame retardance.

[0045] Preferably, the elastic pushing element includes a blocking airbag and a thorn mechanism. The blocking airbag is filled with inert gas inside, the blocking airbag is installed in the drawing cavity 12, the thorn mechanism is installed on the inner wall of the drawing cavity 12, and there is an elastic telescopic needle and a thermal magnetic snap switch facing the blocking airbag inside the thorn mechanism. The thermal magnetic snap switch restricts the elongation of the elastic telescopic needle.

[0046] In this embodiment, when the temperature in a certain drawer 13 is too high, the thermal magnetic snap switch opens the restriction on the elastic telescopic needle, and the elastic telescopic needle elongates to pierce the blocking airbag. The blocking airbag immediately supplements the inert gas inside to the periphery of the drawer 13 to achieve the effect of local high-efficiency flame retardance.

[0047] As Figure 4 shown, preferably, an exhaust opening 24 communicating with the heat dissipation channel 14 is opened at one end of the drawing cavity 12 close to the heat dissipation channel 14, and an air inlet opening 25 communicating with the inner cavity of the housing 11 is opened at the end of the drawing cavity 12 far from the heat dissipation channel 14. The gas enters the heat dissipation channel 14 from the air inlet opening 25 through the exhaust opening 24 to form a first heat dissipation flow path flowing from the outside to the inside.

[0048] In this embodiment, since there is an upward air flow inside the heat dissipation channel 14, the lower the air pressure is at the place with higher flow velocity. The air in the drawing cavity 12 is affected by the low-pressure area and spontaneously flows from the air inlet opening 25 through the drawer 13 and finally enters the heat dissipation channel 14 through the exhaust opening 24. Since the air flow in this embodiment is restricted by the air inlet opening 25 and the exhaust opening 24, the air flow horizontally flows through the whole of the drawer 13, with uniform heat dissipation, reducing the air flow blind area, improving the temperature consistency of the switch cabinet, and reducing the occurrence of local high temperature. On the one hand, the heat dissipation space is concentrated in the central heat dissipation channel 14, which can reduce the space required for heat dissipation. On the other hand, with this air flow direction from the outside to the center, the high-temperature air flow is concentrated in the central heat dissipation channel 14, and using the natural law that heat flows upward, it can accelerate the intake of cold air at the bottom into the inner cavity of the switch cabinet.

[0049] As Figure 5 and Figure 4 shown, preferably, the blocking unit 18 includes a first blocking plate 26, an elastic reset member 27 and a lock. The first blocking plate 26 is connected to the drawer 13 and is arranged opposite to the air inlet opening 25. The first blocking plate 26 blocks or opens the air inlet opening 25. The lock is installed on the housing 11 to lock or unlock the drawer 13. The elastic reset member 27 connects the drawer 13 and the inner wall of the drawing cavity.

[0050] In this embodiment, when the drawer box 13 is locked in the drawer cavity 12 , the first blocking plate 26 is offset from the air inlet opening 25 on the inner wall of the drawer cavity 12 , and the air inside the drawer cavity 12 can communicate with the inner cavity of the housing 11 .

[0051] Preferably, the blocking unit 18 further includes a second blocking plate 41 and a second elastic reset member, the second blocking plate 41 is movably connected to the wall of the drawer chamber 12 and is used to open or close the exhaust opening 24, and a spring is arranged between the second blocking plate 41 and the wall of the drawer chamber 12. The drawer box 13 moves inward and approaches the heat dissipation channel 14 until the drawer box 13 is completely moved to the limit position, the side wall of the drawer box 13 abuts against the second blocking plate 41 and squeezes the spring, the second blocking plate 41 is away from the exhaust opening 24, and the gas in the heat dissipation channel 14 is connected to the gas in the drawer chamber 12 through the exhaust opening 24.

[0052] like Figure 7 , Figure 3 and Figure 4 As shown, preferably, a cold air port 29 is also opened at the bottom of the shell 11, and a heat dissipation fan is rotatably arranged in the heat dissipation channel 14, a high-flow rate and low-pressure area is formed in the heat dissipation channel 14, and the bottom cold air passes through the cold air port 29, the air inlet opening 25, the exhaust opening 24 and the heat dissipation channel 14 in sequence to form a second heat dissipation flow channel from bottom to top.

[0053] In this embodiment, the second heat dissipation channel is formed by a low-pressure area formed by the upward airflow in the heat dissipation channel 14. The second heat dissipation channel generally draws the bottom cold air upward into the inner cavity of the outer shell 11, and enters each pulling cavity 12 to complete the heat exchange, and finally discharges it upward through the heat dissipation channel 14. Since the cold air outlet 29 is located on the lower side of the outer shell 11, the characteristic of cold air sinking can be used to draw in colder air in the external environment for cooling, and the cooling effect is good.

[0054] like Figure 3 As shown, preferably, a first switch component 30 and a second switch component 31 are also provided on the housing 11. The first switch component 30 is provided at the upper end of the housing 11 and blocks or opens the opening at the upper end of the heat dissipation channel 14. The second switch component 31 is provided at the bottom of the housing 11 and blocks or opens the opening at the lower end of the heat dissipation channel 14.

[0055] like Figure 6As shown, in specific implementation, the first switch member 30 includes a shielding plate 32, a bracket 33, a first elastic member 34, and a first telescopic rod 35. The lower end surface of the shielding plate 32 is a downwardly convex conical surface 36. The shielding plate 32 shields the upper opening of the heat dissipation channel 14. The lower side of the shielding plate 32 is connected to the bracket 33. The bracket 33 is slidably connected to the housing 11 in the vertical direction. The first elastic member 34 is connected between the housing 11 and the bracket 33 and provides a downward elastic force to the first elastic member 34. The first telescopic rod 35 is installed on the housing 11 and abuts against the shielding plate 32 upwardly.

[0056] In this embodiment, when the first switch member 30 is in the open state, pushed by the first telescopic rod 35, the first elastic member 34 is compressed, the shielding plate 32 moves upward, and a distance is formed between the shielding plate 32 and the upper opening of the heat dissipation channel 14 to facilitate air circulation.

[0057] When the first switch member 30 is in the closed state, the first telescopic rod 35 retracts, the first elastic member 34 pushes the shielding plate 32 to move downward, and the shielding plate 32 closely adheres to the upper opening of the heat dissipation channel 14 to prevent the air in the heat dissipation channel 14 from flowing out through the upper opening.

[0058] The lower side of the shielding plate 32 is the conical surface 36. The gas flowing out of the upper opening of the heat dissipation channel 14 is guided by the conical surface 36, and a uniform low-pressure area distributed in a circle can be formed at the upper opening of the heat dissipation channel 14 to facilitate the uniform extraction of the high-temperature gas in the heat dissipation channel 14.

[0059] As Figure 7 As shown, preferably, the second switch member 31 includes a bottom plate 37, a connecting frame 38, a second elastic member 39, and a second telescopic rod 40. The upper side of the bottom plate 37 is connected to the connecting frame 38. The connecting frame 38 is connected to the housing 11 and slides up and down on the housing 11. The second elastic member 39 is connected between the connecting frame 38 and the housing 11 and provides an upward elastic force to the connecting frame 38. The second telescopic rod 40 is disposed on the housing 11 and pushes the bottom plate 37 to move downward.

[0060] In this embodiment, when the second switch member 31 is in the open state, the second telescopic rod 40 pushes the bottom plate 37 downward. The bottom plate 37 compresses the second elastic member 39 through the connecting frame 38, and the bottom plate 37 is separated from the lower opening of the heat dissipation channel 14 to form an air intake gap. When the second switch member 31 is in the closed state, the second telescopic rod 40 retracts upward, and the second elastic member 39 pushes the connecting frame 38 and the bottom plate 37 to move upward and block the lower opening of the heat dissipation channel 14.

[0061] Control the switches of the first switch member 30 and the second switch member 31 according to the actual situation. The present embodiment provides the following usage modes: First, the conventional heat dissipation mode, where both the first switch member 30 and the second switch member 31 are turned on, and the external air flow naturally passes through the switch cabinet from bottom to top for heat dissipation; Second, the strong cooling mode, where both the first switch member 30 and the second switch member 31 are turned on, and moreover, the jet unit 20 is started. The strong flow rate forms a low-pressure area to greatly increase the upward flow rate of the air flow in the heat dissipation channel 14, thereby improving the heat dissipation capacity. Third, the dust-proof mode, where the first switch member 30 is turned off and the second switch member 31 is turned on. An electrically rotating fan blade is installed in the heat dissipation channel 14, and the cold air at the bottom is sucked into the inner cavity of the switch cabinet. Since the pressure inside the switch cabinet is higher than that outside, the internal gas is discharged outward through the gaps of the switch cabinet, thereby reducing the probability of external dust entering the internal space of the switch cabinet and having a good dust-proof effect.

[0062] Specific usage method of the present invention:

[0063] First, when the device can maintain the internal temperature within the set range through heat exchange with the outside world through the outer shell 11, no additional heat dissipation action is required, and the dust-proof mode is started. Both the first switch member 30 and the second switch member 31 are closed simultaneously. An electrically rotating fan blade is installed in the heat dissipation channel 14, and the cold air at the bottom is sucked into the inner cavity of the switch cabinet. Since the pressure inside the switch cabinet is higher than that outside, the internal gas is discharged outward through the gaps of the switch cabinet, thereby reducing the probability of external dust entering the internal space of the switch cabinet.

[0064] Second, during daily use, start the conventional heat dissipation mode. Both the first switch member 30 and the second switch member 31 are turned on, and the fan in the heat dissipation channel 14 rotates. The cold air at the bottom enters the inner cavity of the outer shell 11 through the bottom opening of the heat dissipation channel 14 and the cold air port 29. And because there is a certain flow rate in the heat dissipation channel 14, a low-pressure area is formed in the heat dissipation channel 14. The cold air stored in the inner cavity of the outer shell 11 enters the drawer cavity 12 to uniformly and comprehensively cool and dissipate heat from the drawer box 13 inside the drawer cavity 12 and the circuits and components installed on the drawer box 13. The cold air becomes hot and enters the heat dissipation channel 14 and is discharged upward.

[0065] Third, when there is a local heat source inside the switch cabinet, the strong cooling mode is started. Both the first switch member 30 and the second switch member 31 are turned on, and moreover, the jet unit 20 is started. High-flow air is formed at the upper end opening of the heat dissipation channel 14, and at the same time, a low-pressure area is formed, and the internal and external pressure difference increases to greatly increase the upward flow rate of the air flow in the heat dissipation channel 14, thereby improving the heat dissipation capacity and greatly improving the heat dissipation capacity of the conventional heat dissipation mode.

[0066] Fourth, when a local ignition point appears inside the switch cabinet, the first-level active isolation mode is immediately activated. The thermal magnetic release 16 inside the relevant drawer box 13 senses the temperature change and immediately trips. The drawer box 13 disengages from the drawer cavity 12 under the thrust of the elastic ejecting member, and the drawer box 13 drives the blocking unit 18 to move to block the gas passage, cut off the gas connection between the high-temperature abnormal unit and the inner cavity of the switch cabinet, and reduce the secondary damage caused by the high-temperature abnormal unit to other circuits inside the switch cabinet.

[0067] Fifth, if the first-level active isolation mode fails to effectively isolate the ignition point, the second-level active isolation mode is activated. The thermal magnetic snap switch releases the restriction on the elastic telescopic needle, and the elastic telescopic needle extends to pierce the blocking airbag. The blocking airbag immediately replenishes the inert gas inside to the periphery of the drawer box 13 to achieve the effect of local high-efficiency flame retardancy.

[0068] Sixth, if the second-level active isolation mode fails to effectively isolate the ignition point, the third-level active isolation mode is activated. The second switch member 31 closes the air intake, the jetting unit 20 is activated, the thermal sensing unit controls the solenoid valve 23 to open the valve, and the inert gas quickly enters the inner cavity of the housing 11 and discharges the air to the outside. The inert gas fills the internal space of the switch cabinet to block the internal combustibles.

[0069] The embodiments of the present invention are given for purposes of illustration and description, and are not exhaustive or limit the invention to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are chosen and described in order to better illustrate the principles of the invention and its practical application, and to enable those of ordinary skill in the art to understand the invention and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A switch cabinet convenient for pulling out and overhauling, comprising a housing, the housing having a plurality of pulling cavities, and a pulling box is slidably arranged in the pulling cavities, characterized in that: A longitudinal heat dissipation channel is provided at the center of the outer shell. A number of the draw-out cavities are distributed on the left and right sides with the heat dissipation channel as the center. A gas channel is provided between the draw-out cavity and the heat dissipation channel. A thermal magnetic release, an elastic ejection element, and a blocking unit are arranged in the draw-out cavity. The thermal magnetic release and the elastic ejection element are arranged between the draw-out cavity and the draw-out box. When the draw-out box is separated from the draw-out cavity, the blocking unit blocks the gas channel; The elastic ejection element includes a blocking airbag and a needle mechanism. The inside of the blocking airbag is filled with inert gas. The blocking airbag is installed in the draw-out cavity. The needle mechanism is installed on the inner wall of the draw-out cavity. The needle mechanism has an elastic telescopic needle and a thermal magnetic snap switch facing the blocking airbag. The thermal magnetic snap switch restricts the elongation of the elastic telescopic needle; An exhaust opening communicating with the heat dissipation channel is opened at one end of the draw-out cavity close to the heat dissipation channel. An air intake opening communicating with the inner cavity of the outer shell is opened at one end of the draw-out cavity far from the heat dissipation channel. Gas enters the heat dissipation channel from the air intake opening through the exhaust opening to form a first heat dissipation flow path flowing from the outside to the inside; The blocking unit includes a first blocking plate, an elastic reset member, and a lock. The first blocking plate is connected to the draw-out box and is arranged opposite to the air intake opening. The first blocking plate blocks or opens the air intake opening. The lock is installed on the outer shell and locks or opens the draw-out box. The elastic reset member connects the draw-out box and the inner wall of the draw-out cavity; A first switch member and a second switch member are further arranged on the outer shell. The first switch member is arranged at the upper end of the outer shell and blocks or opens the opening at the upper end of the heat dissipation channel. The second switch member is arranged at the bottom of the outer shell and blocks or opens the opening at the lower end of the heat dissipation channel; The first switch member includes a shielding plate, a bracket, a first elastic member, and a first telescopic rod. The lower end surface of the shielding plate is a downwardly convex conical surface. The shielding plate blocks the opening at the upper end of the heat dissipation channel. The lower side of the shielding plate is connected to the bracket. The bracket is slidably connected to the outer shell up and down. The first elastic member connects the outer shell and the bracket and provides a downward elastic force for the first elastic member. The first telescopic rod is installed on the outer shell and abuts against the shielding plate upward; The second switch member includes a bottom plate, a connecting frame, a second elastic member, and a second telescopic rod. The upper side of the bottom plate is connected to the connecting frame. The connecting frame is connected to the outer shell and slides up and down in the outer shell. The second elastic member connects the connecting frame and the outer shell and provides an elastic force for the connecting frame to move upward. The second telescopic rod is arranged in the outer shell and pushes the bottom plate downward; The switch cabinet further includes a high-pressure gas storage tank, a jetting unit, and a heat sensing unit. The high-pressure gas storage tank is connected to the jetting unit through a pipeline. The heat sensing unit is arranged in the draw-out box and is electrically connected to the jetting unit. The jetting unit is installed at the center of the opening at the upper end of the heat dissipation channel; In the conventional heat dissipation mode, both the first switch and the second switch are turned on, and the external air flow naturally passes through the switch cabinet from bottom to top for heat dissipation; in the strong cooling mode, both the first switch and the second switch are turned on, and moreover, the jet unit is started, and the strong flow rate forms a low-pressure area, which increases the upward flow rate of the air flow in the heat dissipation channel, thereby improving the heat dissipation capacity; in the dust-proof mode, the first switch is turned off and the second switch is turned on. Electrically rotating fan blades are installed in the heat dissipation channel, and cold air at the bottom is sucked into the inner cavity of the switch cabinet. Since the pressure inside the switch cabinet is higher than that outside, the internal gas is discharged outward through the gaps of the switch cabinet.

2. The switch cabinet convenient for pulling and overhauling according to claim 1, wherein: The switch cabinet further includes an inert gas storage tank and a magnetically controlled valve connected to the inert gas storage tank. The air outlet of the magnetically controlled valve communicates with the inner cavity of the housing, and the thermal sensing unit is electrically connected to the magnetically controlled valve.

3. The switch cabinet convenient for pulling and overhauling according to claim 1 is characterized in that: A cold air port is further opened at the bottom of the housing. A heat dissipation fan is rotatably arranged in the heat dissipation channel. A high-flow-rate low-pressure area is formed in the heat dissipation channel. The cold air at the bottom sequentially passes through the cold air port, the air inlet opening, the air outlet opening and the heat dissipation channel to form a second heat dissipation flow path from bottom to top.

Images