Temperature-adjustable low-voltage cabinet and temperature control method thereof

Abstract

The invention discloses a low-voltage cabinet capable of regulating and controlling temperature and a temperature control method thereof, and belongs to the technical field of power distribution cabinets, the low-voltage cabinet capable of regulating and controlling temperature comprises a cabinet body, a main circuit breaker and a plurality of control transformers, the control transformers are connected with branch circuit breakers in series, and the branch circuit breakers are connected with the main circuit breaker. The main circuit breaker is electrically connected with the plurality of control transformers through a conductive mechanism. Through overall optimization, the cabinet body and the inner box are matched for use to form a plurality of independent partition spaces, control transformers of a plurality of branches are independently installed, the space of the inner box is small, the temperature state of a certain control transformer can be detected in a more targeted mode, temperature detection and cooling can be conducted more accurately, and the temperature of the control transformer can be detected more accurately. Temperature abnormity can be found more timely, a partition effect is achieved, and mutual influence among a plurality of control transformers is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of power distribution cabinets, and in particular relates to a temperature-adjustable low-voltage cabinet and a temperature control method thereof. Background Art

[0002] Low voltage cabinets, also called low voltage switchgear or low voltage distribution cabinets, are devices used to distribute and control low voltage electrical energy in electrical systems. They are commonly used in industrial, commercial and residential buildings to receive electrical energy from medium voltage or high voltage systems and distribute it to various low voltage circuits. They mainly include components such as busbars, circuit breakers, control transformers and protection devices;

[0003] When the low-voltage cabinet is in use, because there is a need for transformer power supply, especially when each branch has different voltage requirements, such as the voltage required by the control circuit and the load circuit is quite different, it is necessary to install multiple control transformers, and even each branch needs to install a control transformer. The transformer will generate heat when working. If the control transformer is in a high temperature state, the high temperature will increase the internal resistance and the heat will be more serious. Therefore, it is necessary to set a temperature control device in the low-voltage cabinet for monitoring and cooling;

[0004] The existing Chinese utility model patent with publication number CN209786460U discloses a low-voltage cabinet that uses temperature as a wake-up signal for air cooling. A temperature detection unit is provided. In actual use, the temperature change can be detected, and the fan can be directly awakened to perform air cooling and heat dissipation at abnormally high temperatures. However, it lacks the ability to judge different temperature rise scenarios such as insufficient heat dissipation temperature rise, fault temperature rise, and fire temperature rise. Once in the fault temperature rise or fire temperature rise scenario, the temperature rise cannot be controlled by air cooling, but the equipment can only continue to perform air cooling, which can easily delay the optimal intervention processing time and cause serious damage to the switch equipment. In view of this, a low-voltage cabinet with adjustable temperature and a temperature control method thereof are provided. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the disadvantages of the above-mentioned prior art and provide a low-voltage cabinet with adjustable temperature and a temperature control method thereof.

[0006] The technical solution adopted to solve the above technical problems is:

[0007] A temperature-adjustable low-voltage cabinet comprises a cabinet body and:

[0008] A main circuit breaker and a plurality of control transformers, wherein the main circuit breaker and the control transformers are electrically connected via a conductive mechanism;

[0009] A plurality of inner boxes fixed in the cabinet, the inner box comprising a main body, the detection structure and the control transformer are installed in the main body, the side wall of the main body is provided with rows of holes, and the main body is provided with slide plates at positions corresponding to the rows of holes;

[0010] A release mechanism is placed in the inner box, the release mechanism is connected to a plurality of feeding members, the feeding members store flame-retardant gas, and the release mechanism can drive the slide plate to close the discharge hole when feeding the material inside the feeding member into the inner box;

[0011] The negative pressure mechanism includes an exhaust member, which is connected to the cabinet and the inner box respectively, and the exhaust member can control the ratio of the air intake from the cabinet and the inner box.

[0012] The release mechanism further comprises a multi-way solenoid valve, a nozzle is installed at the outlet end of the multi-way solenoid valve, a slide cylinder is connected in series between the nozzle and the multi-way solenoid valve, and the slide cylinder can extend when the multi-way solenoid valve provides flame-retardant gas to the nozzle.

[0013] Through the above technical scheme, a specific release mechanism structure is disclosed, and the multi-way solenoid valve is used to select the supply part that provides flame-retardant gas. The nozzle disperses the flame-retardant gas into the main body to cover the internal space of the inner box as much as possible. The slide acts as a relay to smoothly transport the material, and during the transportation process, the slide itself will stretch, and when stretched, it will squeeze the slide downward, so that the slide will block the discharge hole.

[0014] Furthermore, an end plate is hingedly installed at one end of the main body facing the cabinet door, and rows of holes are provided on the end plate and the slide plate, and the spacing between adjacent rows of holes in the height direction is greater than the inner diameter of the rows of holes. The extension of the slide tube can drive the end plate to move downward so that the rows of holes on the end plate are completely staggered with the rows of holes on the slide plate, and a limit frame is installed between the slide plate and the end plate, and a tension spring is installed between the slide plate and the limit frame.

[0015] Through the above technical scheme, a sliding plate installation structure is provided, in which the sliding plate is slidably installed on the rear side wall of the end plate through a limit frame, and the sliding plate itself is also provided with rows of holes. When not subject to downward pressure, the tension spring makes the rows of holes of the sliding plate face the rows of holes of the end plate to keep air unobstructed. When the slide tube is extended, the sliding plate is pressed downward by the slide tube to slide, and the rows of holes of the sliding plate are staggered with the rows of holes of the end plate. Because the spacing between adjacent rows of holes is greater than the inner diameter of the rows of holes, when the sliding plate moves down the distance of one row of holes, the rows of holes can be completely staggered to achieve sealing of the rows of holes, and the end plate can be opened forward for easy inspection and maintenance of the sliding plate and the limit frame, and also for easy inspection of the internal detection structure and control transformer.

[0016] Furthermore, the sliding cylinder includes a fixed cylinder and a movable cylinder, the middle spaces of the fixed cylinder and the movable cylinder are connected to a multi-way solenoid valve, an outlet pipe 1 is installed through the side wall of the fixed cylinder, an outlet pipe 2 is installed through the side wall of the movable cylinder, a piston head is installed at one end of the movable cylinder located on the inner side of the fixed cylinder, an inner sleeve is installed at a position of the fixed cylinder corresponding to the top end of the movable cylinder, a guide plug is installed at the inner sleeve corresponding to the top opening of the movable cylinder, and the outlet pipe 1 and the outlet pipe 2 are respectively connected to the nozzle through a three-way valve pipe group.

[0017] Through the above technical scheme, a specific configuration of a slide cylinder is provided. When high-pressure flame-retardant gas enters the middle space of the fixed cylinder and the movable cylinder, the fixed cylinder is fixed on the side wall of the inner box, and the internal pressure causes the movable cylinder to extend downward. The three-way valve pipe group is provided with a three-way valve. The three-way valve connects the outlet pipe 2 with the nozzle, thereby completing the feeding. When feeding is not needed and the slide cylinder is to be kept in an extended state, the three-way valve pipe group connects the outlet pipe 1 with the outlet pipe 2, and the multi-way solenoid valve disconnects the connection with the slide cylinder, so that the material is enclosed in the slide cylinder and does not enter the nozzle. At the same time, the slide cylinder is filled with high-pressure material and can be kept in an extended state. When unlocking is required, the three-way valve pipe group directly guides the material inside the slide cylinder into the nozzle.

[0018] Furthermore, the exhaust component includes a blower, and a middle section shell that passes through from front to back is installed at the air inlet position of the blower, a relay pipe is installed through the side wall of the middle section shell, and the relay pipe is connected with the internal space of the main body through a connecting vessel, an end shell is installed at the front end opening of the middle section shell, and a through opening is provided at the front end of the end shell, and a flap that can close the through opening is installed in the through opening of the end shell, and a linkage component that drives the flap to rotate around the central axis is provided between the flaps.

[0019] Through the above technical scheme, a specific configuration of an exhaust component is disclosed. In order to realize the exhaust of the cabinet and the inner box at the same time, the middle shell is connected with the inner box in conjunction with the relay pipe and the communicating vessel. The communicating vessel is a three-way pipe equipped with a butterfly valve. The butterfly valve is installed between the three-way pipe and the inner box. The upper and lower ports of the three-way pipe are used to connect the relay pipe. When it is necessary to communicate with the inner box, the corresponding butterfly valve is opened, otherwise it will be closed, so that the air extraction action of a single inner box and the simultaneous air extraction action of all inner boxes can be completed. The end shell is used for the connection between the middle shell and the cabinet. Water is added in the through port. The flap is installed flatly with a horizontal central axis. If it needs to be connected, the flap will rotate no more than ninety degrees around the central axis and be in a tilted state. The linkage is a synchronous wheel and a synchronous belt, which can make all the flaps rotate synchronously. When it is necessary to control the proportion of air intake from the cabinet and the inner box, the tilt angle of the flap is increased to allow more air to enter the middle shell from the port, thereby increasing the amount of air intake from the cabinet. Similarly, reducing the tilt angle of the flap or even making the flap vertical can allow less air to enter the middle shell from the port, thereby reducing the amount of air intake from the cabinet.

[0020] Furthermore, the slide cylinder includes a fixed cylinder and a movable cylinder, the middle space of the fixed cylinder and the movable cylinder is connected to a multi-way solenoid valve, an outlet pipe 1 is installed through the side wall of the fixed cylinder, and an outlet pipe 2 is installed through the side wall of the movable cylinder. The movable cylinder is located at one end of the inner side of the fixed cylinder and a clamping plate is installed through a spring frame. The clamping plate can be embedded in the middle opening of the outlet pipe 1 to seal the outlet pipe 1 when the movable cylinder extends downward from the fixed cylinder, and the outlet pipe 2 is connected to the nozzle through a hose.

[0021] Through the above technical scheme, a mechanically self-locking slide cylinder is disclosed, and a clamping plate is installed on the top of the moving cylinder through a spring frame. In the shortened state, the clamping plate is pressed against the inner wall of the fixed cylinder and the spring frame is deformed to store force. In the extended state, the clamping plate can be embedded in the middle opening of the outlet pipe to fix the position of the moving cylinder, and the outlet pipe can be sealed to prevent material from escaping. The mechanical locking structure is simple and stable, and can ensure that after the slide cylinder is extended, it always maintains the extended position and will not retract. It only needs to regularly detect elastic fatigue and component wear to prevent self-locking failure.

[0022] Furthermore, the conductive mechanism includes a main board directly connected to the main circuit breaker, and a support plate connected in parallel to the main board. A connector is installed at the connection position between the main board and the support plate, and the connector can keep the assembly end of the support plate flush with the vertical side wall of the main board.

[0023] Through the above technical scheme, a specific conductive mechanism is disclosed, in which multiple main boards are staggered in front and back and extend from top to bottom, so that more installation positions can be provided in the height direction to adapt to multiple inner boxes and control transformers arranged in a stacked manner. The support plates are arranged horizontally to facilitate parallel connection of multiple control transformers. The connecting parts assist the support plates in aligning with the main boards, thereby reducing the difficulty of installation in narrow spaces and ensuring the installation quality.

[0024] Furthermore, the connecting member includes a pressure block 1 and a pressure block 2, and the pressure block 1 and the pressure block 2 are detachably connected by threading, and the pressure block 1 and the pressure block 2 are provided with vertical grooves facing the main board, and the end of the support plate is provided with a right-angle bending portion, and the support plate is provided with a horizontally extending arc plate at the right-angle bending portion, and the pressure block 1 is provided with a positioning groove 1 corresponding to the arc plate and the support plate, and the pressure block 2 is provided with a positioning groove 2 corresponding to the arc plate.

[0025] Through the above technical scheme, a specific connecting piece is disclosed. When installing multiple main boards and multiple support plates, the multiple support plates can be aligned with the main board by pressing blocks 1 and 2, and clamped and fixed at the corresponding positions of the main board, and then the main board and the support plates can be fixed one by one by bolts, thereby reducing the situation where the bolt holes cannot be aligned due to deformation or dimensional errors of individual main boards and support plates, preventing bolt hole slippage or bolt tilting caused by violent installation in a misaligned state, and ensuring smooth installation.

[0026] Furthermore, a support ear is installed at the bottom of the main body, and the support ear is detachably connected to the cabinet frame by bolts. A top cover is movably installed on the top of the main body. A placement rack is installed on the main body between the top cover and the partition, and the feeding parts are horizontally inserted in the middle of the placement rack.

[0027] Through the above technical solution, the structure of the main body is optimized, and disposable feeding parts can be arranged, such as high-pressure storage tanks. There is no need for a complete set of flame-retardant gas feeding equipment, which reduces the manufacturing and use costs. The disposable feeding parts can be replaced by opening the top cover, which makes maintenance convenient.

[0028] A temperature control method for a low-voltage cabinet comprises the following steps:

[0029] S1. The detection structure detects the internal temperature of the inner box through a temperature sensor. When the temperature is at a preset reasonable threshold value and the equipment is in normal working condition, the flap of the negative pressure mechanism is tilted to connect the blower to the inside of the cabinet. The blower is connected to the inside of the inner box through a relay pipe. The blower works to discharge the air inside the cabinet and the inner box. The outside air is simultaneously supplied to the cabinet and the inner box through the air inlet holes on the side wall of the cabinet and the exhaust holes on the side wall of the inner box, completing the ventilation and cooling of the cabinet and the inner box.

[0030] S2. When the temperature of the inner box is higher than the reasonable threshold, the temperature detected by the temperature sensor of the detection structure reaches the preset high temperature threshold, and the equipment enters the high temperature working condition. The flap of the negative pressure mechanism is in a vertical state to isolate the blower from the inside of the cabinet, and the communicating vessel connects the corresponding high-temperature inner box to the blower alone. The blower is only used to quickly discharge the air inside the corresponding inner box, and the outside air is quickly replenished into the inner box through the discharge holes on the side wall of the inner box. The outside air is accelerated by the reduced diameter at the discharge hole position, so as to realize the high-speed purge and cooling of the corresponding control transformer, and the isolation gap prevents the inner boxes from affecting each other.

[0031] S3. When the equipment is in a high-temperature condition for more than a preset time point, the temperature detected by the temperature sensor of the detection structure is still not lower than the high-temperature threshold, and the equipment enters a dangerous handling condition. The circuit breaker works to disconnect the corresponding control transformer from the conductive mechanism, and the multi-way solenoid valve of the release mechanism is connected to the feeding part that supplies the flame-retardant gas. The internal pressure of the slide cylinder increases to make the movable cylinder extend downward, pushing the slide plate to close the discharge hole, and the blower continues to work so that the air in the inner box is quickly replaced by the flame-retardant gas to prevent high-temperature fire. When the gas concentration sensor of the detection structure detects that the flame-retardant gas concentration is higher than the preset minimum safety value, the blower stops working, and the slide cylinder remains in the extended position, so that the corresponding inner box remains in a state of being filled with flame-retardant gas.

[0032] S5. When the smoke sensor of the detection structure detects smoke in the inner box and the fire is not under control, the equipment enters a dangerous handling condition. The blower works to discharge gas and smoke to put the inner box in a negative pressure or vacuum state. The multi-way solenoid valve is connected to the supply part for supplying flame-retardant gas. By simultaneously supplying flame-retardant gas to the inner box, the dynamic flame-retardant atmosphere of the inner box is maintained. The flowing flame-retardant gas takes the heat out of the inner box, accelerating the temperature control process of the control transformer.

[0033] S6. When the temperature sensor of the detection structure detects that the temperature is higher than the reasonable threshold, and the smoke sensor simultaneously detects that smoke is generated in the inner box, the detection structure directly controls the equipment to enter the dangerous processing condition, shortens the processing flow, and copes with the sudden temperature rise of the control transformer;

[0034] S7. A part of the multiple supply parts can be separated out to store the electronic cleaning liquid separately. The detection structure pre-stores the regular cleaning time. Even if the temperature is at the preset reasonable threshold, the multi-way solenoid valve of the release mechanism is connected to the supply part that supplies the electronic cleaning liquid. The electronic cleaning liquid is sprayed into the inner box through the nozzle to achieve regular live cleaning of the control transformer and prevent abnormal temperature of the control transformer caused by dust accumulation. In addition, flame-retardant gas and electronic cleaning liquid can be sprayed at the same time in high temperature and fire state to assist high-speed air in spraying and cleaning the transformer. Flame-retardant gas can also be used to efficiently cool down and extinguish the fire in the open flame stage.

[0035] The beneficial effects of the present invention are as follows:

[0036] (1) The present invention uses a cabinet and an inner box together through overall optimization to form multiple separate partition spaces, and installs control transformers of multiple branches separately. The space of the inner box is small, so the temperature state of a certain control transformer can be detected more specifically, and temperature detection and cooling can be performed more accurately, and temperature abnormalities can be discovered more timely. It also plays a role of isolation to avoid mutual influence between multiple control transformers;

[0037] (2) The present invention provides a negative pressure mechanism, which performs unified ventilation control on all inner boxes during normal use. When a temperature abnormality occurs in a control transformer, the negative pressure mechanism changes the air inlet channel to be connected to the corresponding inner box separately, thereby generating a continuous airflow with a large flow rate in a channel with a smaller inner diameter, and using the high-speed air jet generated by the row holes to perform targeted air cooling on the control transformer;

[0038] (3) The present invention provides a release mechanism. When the temperature rises and cannot be suppressed by air cooling, the release mechanism can deliver flame-retardant gas to the inner box, and use the airflow in the release mechanism to drive the slide plate to move down to seal the inner box, so that a sealed flame-retardant atmosphere is formed in the inner box. The release mechanism can also form a dynamic flame-retardant atmosphere in the inner box by continuously supplying flame-retardant gas, taking away the heat in the inner box to delay and suppress open flame fires, providing staff with a longer response time and ensuring that the equipment situation is controllable as much as possible before personnel intervene. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a first perspective structural diagram of the present invention;

[0040] Figure 2 It is a schematic diagram of the structure of the present invention when the cabinet is removed;

[0041] Figure 3 It is a partial enlarged schematic diagram of the negative pressure mechanism of the present invention;

[0042] Figure 4 It is a disassembled schematic diagram of the conductive mechanism of the present invention;

[0043] Figure 5 It is a schematic cross-sectional view of the interior of the inner box of the present invention;

[0044] Figure 6 is a cross-sectional schematic diagram of the inner box of the present invention from another viewing angle;

[0045] Figure 7 It is a schematic structural diagram of the release mechanism of the present invention when it is not in operation;

[0046] Figure 8 It is a schematic structural diagram of the release mechanism of the present invention in a working state;

[0047] Fig. 9 is a schematic cross-sectional view of the slide barrel of the release mechanism of the present invention in a shortened state;

[0048] Fig.10 is a schematic cross-sectional view of the slide tube of the release mechanism of the present invention in an extended state;

[0049] Fig.11 It is a schematic diagram of another state of the slide cylinder structure of the release mechanism of the present invention.

[0050] Figure numerals: 1, cabinet; 2, main circuit breaker; 3, conductive mechanism; 31, main board; 32, support plate; 33, connector; 331, pressure block 1; 332, pressure block 2; 333, positioning groove 1; 334, positioning groove 2; 34, arc plate; 4, inner box; 41, main body; 42, top cover; 43, end plate; 44, row holes; 45, partition; 46, slide plate; 461, extension plate; 47, limit frame; 5, negative pressure mechanism; 51, exhaust member; 511, blower; 512, middle shell; 513 , end shell; 514, flap; 515, port; 516, linkage; 52, relay pipe; 53, communicating vessel; 6, control transformer; 7, release mechanism; 71, multi-way solenoid valve; 72, slide cylinder; 721, fixed cylinder; 722, inner sleeve; 723, guide plug; 724, outlet pipe one; 725, piston head; 726, moving cylinder; 727, outlet pipe two; 728, spring rack; 729, clamping plate; 73, three-way valve pipe group; 74, nozzle; 75, hose; 8, feeding parts; 9, detection structure. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0052] like Figure 1 - Fig.11As shown, this embodiment provides a temperature-adjustable low-voltage cabinet, including a cabinet 1, the cabinet 1 has a built-in frame, and a movable door is arranged at the front end, side panels are installed around, and air inlets are opened at the bottom side panels or the bottom of the surrounding side panels for external air to enter the cabinet 1, and also includes a main circuit breaker 2 and a plurality of control transformers 6. The main circuit breaker 2 is installed on the inner upper part of the cabinet 1 to facilitate connection with the busbar entering from the upper part;

[0053] Multiple control transformers 6 are dispersedly arranged in the cabinet 1, and the main circuit breaker 2 and the multiple control transformers 6 are electrically connected through the conductive mechanism 3. Figure 5 The control transformer 6 is connected in series with a circuit breaker, which can disconnect the branch circuit from the main circuit to protect the safety of the equipment under abnormal working conditions.

[0054] The actual problem solved by this solution is how to eliminate the heat dissipation failure and reduce the temperature when the temperature is abnormal, and suppress the open flame as much as possible in an environment where the temperature cannot be controlled, so as to buy time for maintenance personnel to prevent further losses. The following configuration is specifically provided:

[0055] Set inner box 4, refer to Figure 1 The inner box 4 is fixed in the cabinet 1, and a plurality of inner boxes 4 are arranged equidistantly up and down on the internal frame of the cabinet 1, and an isolation gap is left between adjacent inner boxes 4. In use, if there is flowing air in the cabinet 1, it is convenient for air to flow between the inner boxes 4, and it is convenient to use the contact between the inner box 4 and the flowing air in the cabinet 1 to cool down and dissipate heat inside the inner box 4;

[0056] Among them, refer to Figure 6 The inner box 4 includes a main body 41, which is a hollow thin-walled structure and provides an independent installation space. The control transformer 6 is installed separately in the main body 41 and can be separated from other control transformers 6 to avoid mutual influence when the temperature is too high or a local fire occurs;

[0057] In addition, a partition 45 is installed on the inner side of the main body 41 above the control transformer 6, dividing the internal space of the main body 41 into two independent parts, the control transformer 6 is installed in the lower part, and the upper part is used to install other similar release mechanisms 7, feeding parts 8 and detection structures 9, which play a role of partition protection and also ensure the neatness of the control transformer 6. The detection structure 9 is installed through the middle of the partition 45, and can detect specific parameters such as temperature, smoke and gas content in the space where the control transformer 6 is located through the configured temperature sensor, smoke sensor and gas concentration sensor and other probes, provide temperature detection function, and provide electrical signals for subsequent specific temperature processing processes;

[0058] At the same time, the side wall of the main body 41 is provided with rows of holes 44, which are horizontally arranged through holes, and are arranged in multiple rows in the upper and lower parts to facilitate the air to enter and exit the main body 41. The main body 41 is provided with a slide plate 46 at the position corresponding to the row holes 44. The slide plate 46 can block and open the row holes 44 to control the circulation of air.

[0059] Optimize negative pressure mechanism 5, refer to Figure 1 and Figure 2 The negative pressure mechanism 5 is fixed in the cabinet 1, wherein the negative pressure mechanism 5 includes an exhaust piece 51, which is an active piece. In the working state, the exhaust piece 51 can discharge the air in the cabinet 1 out of the cabinet 1, and at the same time, the exhaust piece 51 is connected with the internal space of the inner box 4, that is, the exhaust piece 51 can discharge the air in the inner box 4 out of the cabinet 1, and at the same time, the exhaust piece 51 can control the ratio of air intake from the cabinet 1 and the inner box 4, that is, the amount of air intake from the cabinet 1 and the inner box 4 can be changed to adapt to different usage scenarios. For example, when the temperature of a certain inner box 4 rises, the inner box 4 can be exhausted separately. At this time, the amount of air entering from the exhaust hole 44 increases, and a jet air with a larger flow rate can be generated to blow the internal control transformer 6 at high speed, reduce the temperature and remove the dust covering the surface.

[0060] A release mechanism 7 is provided, and the release mechanism 7 is placed in the inner box 4. The release mechanism 7 is a set of actuators. The release mechanism 7 is connected to a plurality of feeders 8, and the plurality of feeders 8 respectively provide flame-retardant gas. The feeder 8 can be a complete set of equipment with a storage device and a pumper, and can be installed in the cabinet 1, or installed nearby and connected to the release mechanism 7 through a pipeline. Furthermore, the flame-retardant gas or the electronic cleaning liquid can be stored in different feeders 8, respectively, and an inert gas and a flame-retardant electronic cleaning liquid can be prepared at the same time. This redundant design, in the high-speed purge stage, the high-speed airflow is matched with the spray cleaning liquid, which can efficiently realize high-speed cooling and dust cleaning, and avoid heating caused by insufficient heat dissipation. In the open flame stage, the electronic cleaning liquid can also play the role of spraying fire extinguishing, and the fire handling speed is faster and the safety is higher;

[0061] At the same time, in order to avoid affecting the surrounding control transformer 6 and to provide a specific required state, the release mechanism 7 can drive the slide plate 46 to close the discharge hole 44 when the feeding member 8 provides flame-retardant gas or electronic cleaning liquid into the inner box 4, and the exhaust member 51 stops the air extraction action, providing flame-retardant gas to the inner box 4 to form a sealed flame-retardant atmosphere, and can also reduce the consumption of flame-retardant gas, and ensure the existence time of the flame-retardant atmosphere as much as possible, providing preparation time for the staff to intervene manually. Moreover, when the temperature is too high in the flame-retardant atmosphere, the exhaust member 51 can restart the air extraction action, and the flame-retardant gas in the feeding member 8 continues to flow into the inner box 4 and is discharged from the exhaust member 51 position with heat, and the electronic cleaning liquid can also be sprayed synchronously. In the dynamic flame-retardant atmosphere, the temperature rise rate can be suppressed, and the equipment situation can be controlled as much as possible before personnel intervene.

[0062] Furthermore, a driving member that independently drives the slide plate 46 to work, such as an electric telescopic rod or other power source, may also be provided, but it is necessary to ensure that the driving member and the release mechanism 7 work synchronously, and the synchronous work can be achieved through electrical control.

[0063] In a further embodiment, the specific structure of the release mechanism 7 is disclosed, referring to Figure 6 The release mechanism 7 includes a multi-way solenoid valve 71, which is used to select and connect the supply member 8 that provides flame-retardant gas or electronic cleaning liquid to adapt to different usage scenarios. The outlet end of the multi-way solenoid valve 71 is equipped with a nozzle 74, which is connected in series through a rectangular shell to disperse the discharge of materials to ensure that the entire internal space of the inner box 4 is covered;

[0064] At the same time, a slide 72 is connected in series between the nozzle 74 and the multi-way solenoid valve 71. The slide 72 is arranged vertically, and the top end thereof penetrates the partition 45 and extends to the upper part of the inner box 4 so as to be connected to the multi-way solenoid valve 71 through a pipeline. The slide 72 plays a relay role to smoothly transport the material from the multi-way solenoid valve 71 to the nozzle 74. The slide 72 extends when the multi-way solenoid valve 71 provides the nozzle 74 with flame-retardant gas and electronic cleaning liquid. This extension action can be used as a power source for the movement of the slide plate 46.

[0065] Specifically, an extension plate 461 is installed at the lower end of the slide 46 corresponding to the slide 72. The upper end of the slide 72 is fixed. The lower end of the slide 72 is in sliding contact with the top surface of the extension plate 461. A limit frame 47 is installed between the slide 46 and the end plate 43. The limit frame 47 ensures that the slide 46 is in a vertical position when sliding. During the conveying process, the slide 72 extends and squeezes the slide 46 downward, so that the slide 46 blocks the row hole 44. There is no need to set up other power sources and synchronous control equipment, and the structure is more stable.

[0066] In a further embodiment, a mounting structure of a slide plate 46 is provided, wherein an end plate 43 is hingedly mounted on one end of the main body 41 facing the door opening of the cabinet 1, and the end plate 43 can be lifted upward, and a limit frame 47 is fixed to the upper part of the rear side wall of the end plate 43, and the limit frame 47 has a set round rod, and a sleeve matching the round rod is installed at the bottom end of the end plate 43, and the slide plate 46 is slidably mounted on the rear side wall of the end plate 43, so that the slide plate 46 can be exposed when the end plate 43 is lifted upward, which is convenient for later maintenance;

[0067] At the same time, the end plate 43 and the slide plate 46 are provided with rows of holes 44, referring to Figure 7 When there is no downward pressure, the tension spring makes the row holes 44 of the slide plate 46 face the row holes 44 of the end plate 43 to keep the air flowing. Figure 8When the slide 72 is extended, the slide plate 46 is pressed downward by the slide 72 to slide, and the row holes 44 of the slide plate 46 are staggered with the row holes 44 of the end plate 43. Because the spacing between adjacent row holes 44 is greater than the inner diameter of the row holes 44, when the slide plate 46 moves down by the distance of one row hole 44, the row holes 44 can be completely staggered, thereby achieving sealing of the row holes 44.

[0068] In addition, a tension spring is installed between the end plate 43, the slide plate 46 and the limit frame 47. When the slide plate 46 moves downward, the tension spring is stretched to store force. When the slide tube 72 shortens, the slide plate 46 will be driven by the tension spring to reset and maintain a position where air can flow freely. The end plate 43 can be opened forward, which is also convenient for checking the internal detection structure 9 and the control transformer 6.

[0069] In a further embodiment, a specific configuration of a slide cylinder 72 is provided, referring to Fig. 9 The slide cylinder 72 includes a fixed cylinder 721 and a movable cylinder 726. The middle space of the fixed cylinder 721 and the movable cylinder 726 is connected to the multi-way electromagnetic valve 71. When the high-pressure flame-retardant gas or electronic cleaning liquid enters the middle space of the fixed cylinder 721 and the movable cylinder 726, the fixed cylinder 721 is fixed on the side wall of the inner box 4, and the movable cylinder 726 is located at one end of the inner side of the fixed cylinder 721 and is equipped with a piston head 725. The internal pressure will cause the movable cylinder 726 to extend downward, completing the downward extension action of the slide cylinder 72;

[0070] At the same time, an outlet pipe 1 724 is installed through the side wall of the fixed cylinder 721, and an outlet pipe 2 727 is installed through the side wall of the movable cylinder 726. The material can flow out from these two places. The outlet pipe 1 724 and the outlet pipe 2 727 are respectively connected to the nozzle 74 through the three-way valve pipe group 73. The three-way valve pipe group 73 has a three-way valve, which can be controlled by the reversing of the three-way valve.

[0071] Specifically, refer to Fig. 9 The three-way valve connects the outlet pipe 727 to the nozzle 74, completing the feeding. Fig.10 When there is no need to feed materials but the slide 72 is to be kept in an extended state, the three-way valve pipe group 73 connects the outlet pipe 1 724 and the outlet pipe 2 727, and the multi-way solenoid valve 71 is disconnected from the slide 72, so that the material is enclosed in the slide 72 and does not enter the nozzle 74. At the same time, the slide 72 is filled with high-pressure materials and can be kept in an extended state. When unlocking is required, the three-way valve pipe group 73 directly guides the material inside the slide 72 into the nozzle 74. Through the self-locking of the solenoid valve, efficient automatic control can be achieved. However, if the three-way valve is damaged in a high-temperature environment, the self-locking will fail, so a high-temperature resistant three-way valve needs to be configured;

[0072] It should be emphasized that an inner sleeve 722 is installed at the top position of the fixed cylinder 721 corresponding to the movable cylinder 726. The inner diameter of the inner sleeve 722 is smaller than the inner diameter of the fixed cylinder 721, but larger than the outer diameter of the piston head 725. It can limit the upper limit position of the movable cylinder 726 to avoid excessive upward movement of the movable cylinder 726, so that the bottom end of the fixed cylinder 721 directly contacts and wears or knocks against the outlet pipe 727, thereby ensuring the stability of the outlet pipe 727 and the pipeline structure connected to the outlet pipe 727.

[0073] In a further embodiment, in order to realize the exhaust of the cabinet 1 and the inner box 4 at the same time, a specific configuration of the exhaust member 51 is disclosed, referring to Figure 3 The exhaust member 51 includes a blower 511, which is arranged front to back and conveys the air in front to the rear when working. The blower 511 is embedded and fixed on the rear side plate of the cabinet 1 and communicates with the external air. A middle section shell 512 that penetrates front to back is installed at the air inlet of the blower 511. The outer contour of the middle section shell 512 is cylindrical and adopts a hollow design. A relay pipe 52 is installed through the circumferential side wall of the middle section shell 512. The relay pipe 52 is communicated with the internal space of the main body 41 through the communicating vessel 53;

[0074] Preferably, the communicating vessel 53 is a three-way pipe equipped with a butterfly valve, the butterfly valve is installed between the three-way pipe and the inner box 4, and the upper and lower ports of the three-way pipe are used to connect the relay pipe 52. When it is necessary to communicate with the inner box 4, the corresponding butterfly valve is opened, otherwise it is closed, so that the air pumping action of a single inner box 4 and the air pumping action of all inner boxes 4 can be completed;

[0075] An end shell 513 is installed at the front opening of the middle shell 512. The end shell 513 is also designed to be through-connected from front to back. A through-port 515 is provided at the front end of the end shell 513. A flap 514 is closely arranged and installed in the through-port 515. The flap 514 has a horizontal central axis. If communication is required, the flap 514 will rotate no more than ninety degrees around the central axis and be in an inclined state. The linkage 516 is a synchronous wheel and a synchronous belt, which can make all the flaps 514 rotate synchronously. When it is necessary to control the proportion of air intake from the cabinet 1 and the inner box 4, the inclination angle of the flap 514 is increased to allow more air to enter the middle shell 512 from the through-port 515, so that the air intake from the cabinet 1 can be increased.

[0076] Similarly, by reducing the tilt angle of the flap 514 or even making the flap 514 vertical, less air can enter the middle shell 512 from the opening 515, and the amount of air sucked from the cabinet 1 can be reduced. That is, the flap 514 can be rotated from a vertical state to a horizontal state, and a linkage 516 is provided between the flaps 514.

[0077] Specifically, the linkage 516 can be a combination of a double-groove synchronous wheel and a synchronous belt. The double-groove synchronous wheel is installed at the end of the central shaft, and the synchronous belt is sleeved between adjacent double-groove synchronous wheels. If one of the double-groove synchronous wheels is connected to the motor, synchronous rotation drive can be achieved. Similarly, the linkage 516 can also be a gear set that meshes one by one, or other synchronous structures, which will not be elaborated here and can be selected independently according to the usage scenario.

[0078] In a further embodiment, a mechanically self-locking slide 72 is disclosed, referring to Fig.11 The slide cylinder 72 includes a fixed cylinder 721 and a movable cylinder 726. The middle space of the fixed cylinder 721 and the movable cylinder 726 is connected to the multi-way electromagnetic valve 71. The side wall of the fixed cylinder 721 is penetrated with an outlet pipe 1 724, and the side wall of the movable cylinder 726 is penetrated with an outlet pipe 2 727. The movable cylinder 726 is located at one end of the inner side of the fixed cylinder 721 and is installed with a clamping plate 729 through a spring frame 728. The top of the movable cylinder 726 is installed with a clamping plate 729 through the spring frame 728.

[0079] In the shortened state, the clamping plate 729 presses against the inner wall of the fixed cylinder 721 and the spring frame 728 deforms to store force. In the extended state, the clamping plate 729 can be inserted into the middle opening of the outlet pipe 1 724 to fix the position of the movable cylinder 726 and seal the outlet pipe 1 724 to prevent the material from escaping.

[0080] The mechanical locking structure is simple and stable, and can ensure that after the slide cylinder 72 is extended, it always maintains the extended position and will not retract. It only needs to regularly detect elastic fatigue and component wear to prevent self-locking failure. The outlet pipe 727 is connected to the nozzle 74 through the hose 75. When feeding is needed, the material is directly fed through the hose 75. The inner sleeve 722 is installed with a guide plug 723 at the top opening of the movable cylinder 726. The guide plug 723 is cylindrical as a whole and is fixed to the lower part of the inner sleeve 722. There is a flat surface at the front end. The front end of the vertical inner wall of the movable cylinder 726 also has a matching flat surface. After the movable cylinder 726 is extended, the guide plug 723 is still in sliding contact with the inner wall of the movable cylinder 726.

[0081] Attached Fig.11 In order to reflect this positional relationship, the guide plug 723 is cut off from the middle, leaving only the upper and lower sections of the guide plug 723, and the upper and lower sections of the guide plug 723 are numbered respectively. There are not two guide plugs 723, which is explained here to prevent misunderstanding (refer to Fig.10 The guide plug 723 in the middle makes the movable cylinder 726 limited by sliding, and can only slide vertically but cannot rotate, so as to prevent the movable cylinder 726 from rotating and causing the hose 75 to be entangled on the outside of the movable cylinder 726, thereby ensuring smooth feeding and preventing the hose 75 from being twisted or even torn off;

[0082] It should be emphasized that the diameter of the guide plug 723 is smaller than the inner diameter of the movable cylinder 726. Except for the flat surface at the front end, the circumferential outer wall at other positions does not contact the circumferential inner wall of the movable cylinder 726, which ensures guidance while facilitating the smooth passage of materials.

[0083] In a further embodiment, a specific conductive mechanism 3 is disclosed, referring to Figure 4 The conductive mechanism 3 includes a main board 31 directly connected to the main circuit breaker 2. Multiple main boards 31 are arranged in a staggered manner front to back and extend from top to bottom, which can provide more installation positions in the height direction to adapt to the multiple inner boxes 4 and control transformers 6 arranged in a stacked manner, and a support plate 32 connected in parallel to the main board 31. The support plate 32 is arranged horizontally, penetrates the inner box 4 and is connected to the control transformer 6, which is convenient for connecting multiple control transformers 6 in parallel. Bolt holes are respectively provided in the middle of the main board 31 and the left end of the support plate 32, and the two are fixedly connected by bolts. In order to facilitate the alignment of the bolts, a connector 33 is installed at the connection position of the main board 31 and the support plate 32. The connector 33 can keep the assembly end of the support plate 32 flush with the vertical side wall of the main board 31. The connector 33 assists the support plate 32 to align with the main board 31, reduces the difficulty of installation in a narrow space, and ensures the installation quality.

[0084] In a further embodiment, a specific connecting member 33 is disclosed, referring to Figure 4 When installing multiple main boards 31 and multiple support boards 32, the connecting member 33 includes a first pressing block 331 and a second pressing block 332, and the first pressing block 331 and the second pressing block 332 are detachably connected by threading, and the multiple support boards 32 and the main board 31 can be aligned by the first pressing block 331 and the second pressing block 332;

[0085] Specifically, the first pressing block 331 and the second pressing block 332 are provided with vertical grooves facing the main board 31. When the first pressing block 331 and the second pressing block 332 approach the main board 31 from the left and right sides, the main board 31 can be stuck in the vertical grooves. The end of the support plate 32 is provided with a right-angled bending portion. The support plate 32 is provided with a horizontally extending arc plate 34 at the right-angled bending portion. The arc plate 34 has a horizontally extending axis. The first pressing block 331 is provided with a positioning groove 333 corresponding to the arc plate 34 and the support plate 32. The positioning groove 333 opens upward, which is convenient for being stuck on the support plate 32 from bottom to top, and passes through the left and right side walls of the first pressing block 331.

[0086] A circular arc-shaped blind groove corresponding to the arc plate 34 is formed on the left half of the pressing block 1 331. When the pressing block 1 331 moves leftward and approaches the main board 31, the right end of the arc plate 34 is inserted into the positioning groove 1 333, so that the support plate 32 can be pulled to the left, and the height of the support plate 32 can be changed by moving the pressing block 1 331 up and down. The pressing block 2 332 is provided with a positioning groove 2 334 corresponding to the arc plate 34. The positioning groove 2 334 is a circular arc-shaped blind groove with an opening to the right. When the pressing block 1 331 moves rightward and approaches the main board 31, the left end of the arc plate 34 is inserted into the positioning groove 1 In the groove 1 333, after the pressure block 1 331 and the pressure block 2 332 are connected by threading, they can drive all the support plates 32 to move up and down and left and right. With the setting of the vertical groove, the reserved bolt holes on the main board 31 and the support plate 32 are aligned one by one, and then the main board 31 and the support plate 32 are fixed one by one by bolts, thereby reducing the situation where the bolt holes cannot be aligned due to deformation or dimensional errors of individual main boards 31 and support plates 32, preventing the bolt holes from slipping or the bolts from tilting due to violent installation in a misaligned state, and ensuring smooth installation.

[0087] In a further embodiment, the structure of the main body 41 is optimized, referring to Figure 1 and Figure 2 The main body 41 is provided with a support ear at the bottom, and the support ear is detachably connected to the cabinet 1 frame by bolts, so that the main body 41 can be removed from the cabinet 1. The top of the main body 41 is movably provided with a top cover 42. Figure 5 The top cover 42 can be hinged, and the feeding piece 8 inside can be exposed by lifting it upwards. The main body 41 is located between the top cover 42 and the partition 45, and a placement rack is installed. The feeding piece 8 is horizontally inserted side by side in the middle of the placement rack;

[0088] A disposable feeding component 8, such as a high-pressure storage tank, can be arranged. There is no need for a complete set of flame-retardant gas and electronic cleaning liquid feeding equipment, which reduces the manufacturing and use costs. The disposable feeding component 8 can be replaced by opening the top cover 42, which is convenient for maintenance. The top cover 42 and the main body 41 can also be installed in a front-to-back sliding connection (not shown in the figure, a drawer-like structure). The top cover 42 can be removed by pulling it forward, and the space required for replacing the feeding component 8 is smaller. Combined with the partition space reserved between the inner boxes 4, the feeding component 8 can be replaced without disassembling the inner box 4.

[0089] A temperature control method for a low-voltage cabinet comprises the following steps:

[0090] Step 1, the detection structure 9 has a single-chip microcomputer as a carrier, and is provided with multiple expansion interfaces, and a temperature sensor, a smoke sensor and a gas concentration sensor can be installed. The detection structure 9 detects the internal temperature of the inner box 4 through the temperature sensor. When the temperature is at a preset reasonable threshold value, the equipment is in normal working condition, and the flap 514 of the negative pressure mechanism 5 is in an inclined state so that the blower 511 is connected to the inside of the cabinet 1. The blower 511 is connected to the inside of the inner box 4 through the relay tube 52. The blower 511 works to discharge the air inside the cabinet 1 and the inner box 4, and the outside air is synchronously supplied to the cabinet 1 and the inner box 4 through the air inlet hole on the top of the cabinet 1 and the exhaust hole 44 on the side wall of the inner box 4, completing the ventilation and cooling of the cabinet 1 and the inner box 4;

[0091] Step 2: When the temperature of a certain inner box 4 is higher than a reasonable threshold, the temperature detected by the temperature sensor of the detection structure 9 in the inner box 4 reaches the preset high temperature threshold, and the equipment enters a high temperature working condition. The flap 514 of the negative pressure mechanism 5 is in a vertical state to isolate the blower 511 from the inside of the cabinet 1, and the connecting vessel 53 connects the corresponding high-temperature inner box 4 to the blower 511 alone, and the other inner boxes 4 are disconnected from the blower 511. The blower 511 is only used to quickly exhaust the air inside the corresponding inner box 4, and the outside air is quickly replenished through the exhaust holes 44 on the side wall of the inner box 4. Enter the inner box 4, forming a high-speed air jet from front to back, quickly cooling the control transformer 6, increasing the air flow rate inside the inner box 4, realizing rapid cooling of the inner box 4, and blowing away the dust accumulated inside the inner box 4, eliminating the temperature abnormality caused by insufficient heat dissipation. The isolation gap makes the inner boxes 4 not affect each other, ensuring smooth air circulation in the cabinet 1, quickly entering the inner box 4, and preventing the high temperature of the inner box 4 from affecting the normal operation of the control transformer 6 in the adjacent inner box 4. At this stage, electronic cleaning liquid can also be sprayed at the same time. The electronic cleaning liquid can be Fluor i nert FC-43 fluorinated liquid, Paiqi nano circuit board cleaning agent or other flame-retardant electronic cleaning liquid. It will not conduct electricity or support combustion while spraying and cooling, thereby improving the dust cleaning efficiency and cooling speed;

[0092] Step three, when the equipment is in a high temperature condition for more than a preset time point, that is, after a period of targeted rapid cooling, the temperature detected by the temperature sensor of the detection structure 9 is still not lower than the high temperature threshold, the detection structure 9 sends a first control signal, and the equipment enters a dangerous handling condition. At this time, the blower 511 continues to work and is still only used to quickly discharge the air inside the corresponding inner box 4. At the same time, the circuit breaker works to disconnect the corresponding control transformer 6 from the conductive mechanism 3. At this time, the branch is in a power-off state to protect the electrical equipment on the branch. The multi-way solenoid valve 71 of the release mechanism 7 is connected to the feeding piece 8 that supplies the flame-retardant gas. The flame-retardant gas uses inert gases such as nitrogen and has the ability to suppress flames. The internal pressure of the slide cylinder 72 increases, causing the movable cylinder 726 to extend downward, pushing the slide plate 46 to discharge the hole 44 is closed, the blower 511 can quickly suck out the air in the inner box 4, so that the inner box 4 is quickly filled with flame-retardant gas to prevent high-temperature fire. When the gas concentration sensor of the detection structure 9 detects that the concentration of flame-retardant gas is higher than the preset minimum safety value, the safety value can be set to a value or a range between 90% and 95%. When the concentration of flame-retardant gas is at this safety value, the blower 511 stops working, and the slide 72 remains in the extended position. The detection structure 9 can be set with a networking module to upload a danger signal or directly connect to a flashing buzzer alarm to remind the user to pay attention and handle it in time. In the process of waiting for processing, the corresponding inner box 4 is kept in a state of being filled with flame-retardant gas and in a sealed flame-retardant atmosphere to delay the fire or further deterioration of the situation.

[0093] Step 4, when the smoke sensor of the detection structure 9 detects that smoke is generated in the inner box 4, the flame retardant atmosphere fails, and oxygen may enter to destroy the atmosphere, that is, the fire is not controlled, the blower 511 works to discharge the gas and smoke to put the inner box 4 in a negative pressure or vacuum state, and the air and flame retardant gas inside the inner box 4 are extracted at the same time, and the multi-way solenoid valve 71 is connected to the supply part 8 for supplying flame retardant gas and electronic cleaning liquid at the same time. By supplying flame retardant gas and electronic cleaning liquid to the inner box 4 at the same time, the newly entered flame retardant gas can replace the mixed gas sucked out, and the purer flame retardant gas can keep the inner box 4 in a dynamic flame retardant atmosphere, and the spraying of the electronic cleaning liquid synchronously extinguishes the fire and sprays the temperature of the control transformer 6, thereby accelerating the temperature control process of the control transformer 6;

[0094] Step 5. In an extreme environment, when the temperature sensor of the detection structure 9 detects that the temperature is higher than a reasonable threshold, or the temperature sensor detects that the temperature rises rapidly, and the temperature rise rate exceeds the preset temperature upward safety rate, and the smoke sensor also detects that smoke is generated in the inner box 4, the detection structure 9 directly sends a second control signal, and the equipment directly enters a dangerous processing condition, without rapid air cooling, but directly supplies flame-retardant gas and electronic cleaning liquid in a closed state at the same time, quickly extracts the air in the inner box 4 to form a flame-retardant atmosphere, and simultaneously performs liquid spraying for cooling and fire extinguishing, shortening the processing flow, and coping with the sudden temperature rise of the control transformer 6;

[0095] Step six, the detection structure 9 pre-stores the regular cleaning time. Even if the temperature is at the preset reasonable threshold value, the multi-way solenoid valve 71 of the release mechanism 7 is connected to the feeding part 8 for supplying the electronic cleaning liquid. The electronic cleaning liquid is sprayed into the inner box 4 through the nozzle 74 to realize the regular live cleaning of the control transformer 6 to prevent the abnormal temperature of the control transformer 6 caused by dust accumulation. A drainage pipe can be provided at the bottom end of the inner box 4, and a water pump is connected to the lower end of the drainage pipe. The drainage pipe discharges the electronic cleaning liquid accumulated in the inner box 4 in time to avoid the control transformer 6 being immersed in the electronic cleaning liquid for a long time.

[0096] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention.

Claims

1. A temperature-adjustable low-voltage cabinet, comprising a cabinet body (1), characterized in that: Also includes: A main circuit breaker (2) and a plurality of control transformers (6), wherein the main circuit breaker (2) and the control transformers (6) are electrically connected via a conductive mechanism (3); A plurality of inner boxes (4) fixed in the cabinet (1), the inner boxes (4) comprising a main body (41), a detection structure (9) and a control transformer (6) being installed in the main body (41), a row of holes (44) being provided on a side wall of the main body (41), and a slide plate (46) being provided on the main body (41) at positions corresponding to the row of holes (44); A release mechanism (7) is disposed in the inner box (4), the release mechanism (7) being connected to a plurality of supply members (8), the supply members (8) storing flame retardant gas, and the release mechanism (7) can drive the slide plate (46) to close the discharge hole (44) when inputting the flame retardant gas in the supply members (8) into the inner box (4); A negative pressure mechanism (5), the negative pressure mechanism (5) comprising an exhaust member (51), the exhaust member (51) being connected to the cabinet (1) and the inner box (4) respectively, and the exhaust member (51) being capable of controlling the ratio of the air intake from the cabinet (1) and the inner box (4).

2. The temperature-adjustable low-voltage cabinet according to claim 1, characterized in that: The release mechanism (7) comprises a multi-way electromagnetic valve (71), a nozzle (74) is installed at the outlet end of the multi-way electromagnetic valve (71), a slide cylinder (72) is connected in series between the nozzle (74) and the multi-way electromagnetic valve (71), and the slide cylinder (72) can extend when the multi-way electromagnetic valve (71) supplies material to the nozzle (74).

3. The temperature-adjustable low-voltage cabinet according to claim 2, characterized in that: An end plate (43) is hingedly mounted on one end of the main body (41) facing the door opening of the cabinet (1), and rows of holes (44) are provided on the end plate (43) and the slide plate (46). The extension of the slide cylinder (72) can drive the end plate (43) to move downward so that the rows of holes (44) on the end plate (43) and the rows of holes (44) on the slide plate (46) are completely offset.

4. The temperature-adjustable low-voltage cabinet according to claim 3, characterized in that: The slide cylinder (72) comprises a fixed cylinder (721) and a movable cylinder (726); the movable cylinder (726), the fixed cylinder (721) and the multi-way electromagnetic valve (71) are connected in sequence; the fixed cylinder (721) and the movable cylinder (726) are connected to the nozzle (74) via a three-way valve pipe group (73) respectively.

5. The temperature-adjustable low-voltage cabinet according to claim 4, characterized in that: The exhaust member (51) comprises a blower (511), a middle shell (512) is installed at the air inlet of the blower (511), the middle shell (512) is connected to the main body (41), an end shell (513) is installed at the front end of the middle shell (512), and a flap (514) that can close the opening (515) is installed at the end of the end shell (513).

6. The temperature-adjustable low-voltage cabinet according to claim 3, characterized in that: The slide cylinder (72) comprises a fixed cylinder (721) and a movable cylinder (726); the movable cylinder (726) is connected to the nozzle (74) through a hose (75); an outlet pipe (724) is installed through the side wall of the fixed cylinder (721); a clamping plate (729) is installed at one end of the movable cylinder (726) located on the inner side of the fixed cylinder (721) through a spring holder (728); the clamping plate (729) seals the outlet pipe (724) when the movable cylinder (726) extends out of the fixed cylinder (721).

7. The temperature-adjustable low-voltage cabinet according to claim 1, characterized in that: The conductive mechanism (3) comprises a main board (31) directly connected to the main circuit breaker (2) and a support plate (32) connected in parallel to the main board (31), and a connecting piece (33) is installed at the connection position between the main board (31) and the support plate (32).

8. The temperature-adjustable low-voltage cabinet according to claim 7, characterized in that: The connecting member (33) comprises a first pressing block (331) and a second pressing block (332), wherein the first pressing block (331) and the second pressing block (332) are connected by threading, a right-angled bending portion is provided at the end of the support plate (32), a horizontally extending arc plate (34) is provided at the right-angled bending portion of the support plate (32), a first positioning groove (333) is provided at the first pressing block (331) corresponding to the arc plate (34) and the support plate (32), and a second positioning groove (334) is provided at the second pressing block (332) corresponding to the arc plate (34).

9. A temperature control method for a low-voltage cabinet, using the temperature-adjustable low-voltage cabinet according to claim 5, characterized in that: The steps include: S1, the detection structure (9) detects the internal temperature of the inner box (4). When the temperature is at a preset reasonable threshold, the flap (514) of the negative pressure mechanism (5) is tilted, and the blower (511) works to synchronously discharge the air inside the cabinet (1) and the inner box (4); S2, the temperature of the inner box (4) rises, the detection structure (9) detects that the temperature reaches a preset high temperature threshold, the flap (514) of the negative pressure mechanism (5) is in a vertical state, the connecting vessel (53) enables the blower (511) to be used only for exhausting the air corresponding to the inner box (4), and the external air passes through the exhaust hole (44) at a reduced diameter and increased speed, thereby achieving high-speed purge cooling of the corresponding control transformer (6); S3, after the equipment is in a high temperature condition for more than a preset time point, the temperature detected by the detection structure (9) is still not lower than the high temperature threshold, the corresponding control transformer (6) is powered off, and the release mechanism (7) supplies flame-retardant gas to the inner box (4) through the feeding member (8). The airflow generated by the flame-retardant gas flowing in the release mechanism (7) causes the slide cylinder (72) to extend and push the slide plate (46) to close the inner box (4), until the detection structure (9) detects that the flame-retardant gas concentration is higher than the preset minimum safety value, the blower (511) stops working, and the slide cylinder (72) remains extended so that the corresponding inner box (4) is in a sealed flame-retardant atmosphere; S4. When the detection structure (9) detects that smoke is generated in the inner box (4), the blower (511) is turned on to put the inner box (4) in a negative pressure state, and the flame-retardant gas is continuously supplied to the inner box (4) through the feeding member (8). The flame-retardant gas is continuously replenished to put the corresponding inner box (4) in a dynamic flame-retardant atmosphere, and the flowing flame-retardant gas takes the heat out of the inner box (4).

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