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

Abstract

The application discloses a temperature-controllable low-voltage cabinet and a temperature control method thereof, and belongs to the technical field of power distribution cabinets. The temperature-controllable low-voltage cabinet comprises a cabinet body, a main circuit breaker and a plurality of control transformers. The control transformers are connected in series with branch circuit breakers. The main circuit breaker and the control transformers are electrically connected through a conductive mechanism. The cabinet body and the inner box are used in combination to form a plurality of separate partition spaces. The control transformers of a plurality of branches are separately installed. The space of the inner box is small, the temperature state of a certain control transformer can be detected more specifically, temperature detection and cooling can be more accurate, temperature abnormalities can be found more timely, and the partition effect is achieved to avoid mutual influence between the control transformers.

Description

Technical Field

[0001] This invention belongs to the field of power distribution cabinet technology, specifically relating to a temperature-adjustable low-voltage cabinet and its temperature control method. Background Technology

[0002] Low-voltage switchgear, also known as low-voltage switch cabinet or low-voltage distribution cabinet, is a device in an electrical system used to distribute and control low-voltage electrical energy. 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 low-voltage switchgear is in use, there is a need for power supply transformation, especially when each branch has different voltage requirements. For example, the voltage required by the control circuit and the load circuit are quite different. Therefore, multiple control transformers need to be installed, or even a control transformer needs to be installed for each branch. The transformer will generate heat when it is working. If the control transformer is in a high temperature state, the high temperature will increase the internal resistance and the heat generation will be more serious. Therefore, temperature control equipment needs to be installed in the low-voltage switchgear for monitoring and cooling.

[0004] The existing Chinese utility model patent with publication number CN209786460U discloses a low-voltage switchgear that uses temperature as a wake-up signal for air cooling. It is equipped with a temperature detection unit, which can detect temperature changes in actual use and directly wake up the fan to perform air cooling when the temperature is abnormally high. However, it lacks the ability to judge different heating scenarios such as insufficient heat dissipation, fault heating, and fire heating. Once a fault heating or fire heating scenario occurs, the heating cannot be controlled by air cooling, but the equipment can only continuously perform air cooling, which can easily delay the best intervention time and cause serious damage to the switching equipment. In view of this, a low-voltage switchgear with adjustable temperature and its temperature control method are provided. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a low-pressure 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 switchgear includes a cabinet and further includes:

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

[0009] Multiple inner boxes are fixed in the cabinet. Each inner box includes a main body, a detection structure and a control transformer are installed inside the main body, and the main body has a row hole on its side wall. The main body is provided with a sliding plate corresponding to the row hole position.

[0010] The release mechanism is placed in the inner box and is connected to multiple feeding components. The feeding components store flame-retardant gas. When the release mechanism inputs the material inside the feeding components into the inner box, it can drive the slide plate to close the discharge hole.

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

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

[0013] The above technical solution discloses a specific release mechanism structure. A multi-way solenoid valve is used to select and connect the feeding component that provides the flame-retardant gas. The nozzle disperses the flame-retardant gas into the main body to cover as much of the inner space of the box as possible. The slide cylinder acts as a relay to facilitate the smooth transport of materials. During the transport process, the slide cylinder itself will extend. When it extends, it will press down on the slide plate, causing the slide plate to block the discharge hole.

[0014] Furthermore, an end plate is hinged to the end of the main body facing the cabinet door. Both the end plate and the slide plate have perforations. The distance between adjacent perforations along the height direction is greater than the inner diameter of the perforations. The extension of the slide cylinder can drive the end plate to move down so that the perforations on the end plate are completely misaligned with the perforations on the slide plate. 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] The above technical solution provides an installation structure for a sliding plate. The sliding plate is slidably installed on the rear side wall of the end plate via a limiting bracket. The sliding plate itself also has perforations. When there is no downward pressure, the tension spring keeps the perforations of the sliding plate aligned with the perforations of the end plate, ensuring airflow. When the slide cylinder extends, the sliding plate is pressed down and slides, and the perforations of the sliding plate are misaligned with those of the end plate. Because the distance between adjacent perforations is greater than the inner diameter of the perforations, when the sliding plate moves down by the distance of one perforation, the perforations can be completely misaligned, achieving sealing of the perforations. The end plate can be lifted forward, facilitating inspection and maintenance of the sliding plate and the limiting bracket, as well as convenient inspection of the internal detection structure and control transformer.

[0016] Furthermore, the slide includes a fixed cylinder and a moving cylinder. The space in the middle of the fixed cylinder and the moving cylinder is connected to a multi-way solenoid valve. An outlet pipe is installed through the side wall of the fixed cylinder, and an outlet pipe is installed through the side wall of the moving cylinder. A piston head is installed at one end of the moving cylinder inside the fixed cylinder. An inner sleeve is installed on the fixed cylinder at the top position corresponding to the moving cylinder. A guide plug is installed on the inner sleeve at the top opening of the moving cylinder. The outlet pipe and the outlet pipe are respectively connected to the nozzle through a three-way valve assembly.

[0017] The above technical solution provides a specific configuration of the slide tube. When high-pressure flame-retardant gas enters the space between the fixed tube and the moving tube, the fixed tube is fixed to the inner side wall of the inner box. The internal pressure will cause the moving tube to extend downward. The three-way valve assembly has a three-way valve, which connects outlet pipe two to the nozzle, thus completing the material supply. When material supply is not required but the slide tube needs to be kept in the extended state, the three-way valve assembly connects outlet pipe one and outlet pipe two, and the multi-way solenoid valve disconnects from the slide tube, so that the material is sealed inside the slide tube and will not enter the nozzle. At the same time, when the slide tube is filled with high-pressure material, it can be kept in the extended state. When unlocking is required, the three-way valve assembly can directly guide the material inside the slide tube into the nozzle.

[0018] Furthermore, the exhaust component includes a blower, and a through-section shell is installed at the air inlet of the blower. A relay pipe is installed through the side wall of the through-section shell, and the relay pipe is connected to the internal space of the main body through a connector. An end shell is installed at the front opening of the through-section shell, and a through-hole is provided at the front end of the end shell. A flap that can close the through-hole is installed in the through-hole of the end shell, and a linkage component is provided between the flaps to drive the flaps to rotate around the central axis.

[0019] The above technical solution discloses a specific configuration of an exhaust component. To achieve simultaneous exhaust of the cabinet and inner chamber, the middle section shell, in conjunction with a relay pipe and a connecting device, connects to the inner chamber. The connecting device is a three-way pipe equipped with a butterfly valve. The butterfly valve is installed between the three-way pipe and the inner chamber. The upper and lower ports of the three-way pipe are used to connect to the relay pipe. When communication with the inner chamber is required, the corresponding butterfly valve opens; otherwise, it closes. This allows for the extraction of air from individual inner chambers as well as simultaneous extraction from all inner chambers. The end shell is used to connect the middle section shell and the cabinet. Water is introduced into the inlet. The flaps are installed horizontally and have a horizontal central axis. If connection is required, the flaps will rotate no more than 90 degrees around the central axis and be in an inclined state. The linkage is a synchronous wheel and a synchronous belt, which can make all flaps rotate synchronously. When it is necessary to control the proportion of air drawn from the cabinet and inner box, the tilt angle of the flaps is increased, allowing more air to enter the middle shell through the opening, thus increasing the amount of air drawn from the cabinet. Similarly, the tilt angle of the flaps is reduced or even made vertical, allowing less air to enter the middle shell through the opening, thus reducing the amount of air drawn from the cabinet.

[0020] Furthermore, the slide includes a fixed cylinder and a moving cylinder. The space in the middle of the fixed cylinder and the moving cylinder is connected to a multi-way solenoid valve. An outlet pipe is installed through the side wall of the fixed cylinder, and an outlet pipe is installed through the side wall of the moving cylinder. A clamping plate is installed at one end of the moving cylinder inside the fixed cylinder via a spring frame. The clamping plate can be inserted into the opening in the middle of the outlet pipe when the moving cylinder extends downward out of the fixed cylinder to seal the outlet pipe. The outlet pipe is connected to the nozzle via a flexible hose.

[0021] The above technical solution discloses a mechanically self-locking slide. A locking plate is installed on the top of the moving cylinder via a spring frame. In the shortened state, the locking plate presses against the inner wall of the fixed cylinder, and the spring frame deforms and stores force. In the extended state, the locking plate can be embedded into the middle opening of the outlet pipe to fix the position of the moving cylinder and seal the outlet pipe to prevent material leakage. The mechanical locking structure is simple and stable, and can ensure that the slide will always maintain the extended position and will not retract after the slide is extended. However, it is necessary to periodically check the 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 enables the mounting end of the support plate to remain flush with the vertical sidewall of the main board.

[0023] The above technical solution discloses a specific conductive mechanism in which multiple main boards are staggered front to back and extend from top to bottom, providing more mounting positions in the height direction to accommodate multiple stacked inner boxes and control transformers. The support plate is arranged horizontally to facilitate the parallel connection of multiple control transformers. The connector helps the support plate to align with the main board, reducing the installation difficulty in narrow spaces and ensuring installation quality.

[0024] Furthermore, the connecting component includes a pressure block one and a pressure block two, which are detachably connected by threading. The pressure block one and the pressure block two have vertical grooves facing the main board. The end of the support plate has a right-angle bend. The support plate has a horizontally extending arc plate at the right-angle bend. The pressure block one has a positioning groove one corresponding to the arc plate and the support plate, and the pressure block two has a positioning groove two corresponding to the arc plate.

[0025] The above technical solution discloses a specific connector. When installing multiple motherboards and multiple support plates, the support plates can be aligned with the motherboards using pressure block one and pressure block two, and clamped and fixed in the corresponding positions on the motherboards. Then, the motherboards and support plates are fixed one by one with bolts. This reduces the situation where bolt holes cannot be aligned due to deformation or dimensional errors of individual motherboards and support plates, and prevents bolt stripping or bolt tilting caused by violent installation in an misaligned state, thus ensuring smooth installation.

[0026] Furthermore, the bottom of the main body is equipped with a support lug, which is detachably connected to the cabinet frame by bolts. A top cover is movably installed on the top of the main body, and a placement rack is installed between the top cover and the partition on the main body. The feeding component is horizontally inserted into the middle of the placement rack.

[0027] By optimizing the structure of the main body through the above technical solution, disposable feeding components, such as high-pressure storage tanks, can be arranged. This eliminates the need for a complete set of flame-retardant gas feeding equipment, reducing manufacturing and usage costs. The disposable feeding components can be replaced simply by opening the top cover, making maintenance convenient.

[0028] A method for temperature control of a low-voltage switchgear includes the following steps:

[0029] S1. The detection structure detects the internal temperature of the inner box through a temperature sensor. When the temperature is within a preset reasonable threshold, the equipment is in normal working condition. The flap of the negative pressure mechanism is tilted to connect the blower with the inside of the cabinet. The blower is connected to the inside of the inner box through a relay pipe. The blower works to exhaust the air inside the cabinet and the inner box. Outside air is simultaneously replenished into the cabinet and the inner box through the air inlet on the side wall of the cabinet and the exhaust hole 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 chamber is higher than the reasonable threshold, the temperature sensor of the detection structure detects that the temperature has entered the preset high temperature threshold. 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. The connector allows the corresponding high temperature inner chamber to be connected to the blower alone. The blower works only to quickly exhaust the air inside the corresponding inner chamber. Outside air is quickly replenished into the inner chamber through the exhaust hole on the side wall of the inner chamber. The outside air is accelerated through the narrowing of the exhaust hole, realizing high-speed purging and cooling of the corresponding control transformer. The isolation gap ensures that the inner chambers do not affect each other.

[0031] S3. When the equipment is in a high-temperature condition for more than the preset time point, if the temperature detected by the temperature sensor of the detection structure is still not lower than the high-temperature threshold, the equipment enters a dangerous handling condition. The circuit breaker will disconnect the corresponding control transformer from the conductive mechanism. The multi-way solenoid valve of the release mechanism will connect with the feeding component that supplies the flame-retardant gas. The internal pressure of the slide cylinder will increase, causing the moving cylinder to extend downwards and push the slide plate to close the discharge hole. The blower will continue to work to quickly replace the air in the inner box with the flame-retardant gas to prevent high-temperature fire. When the gas concentration sensor of the detection structure detects that the concentration of the flame-retardant gas is higher than the preset minimum safety value, the blower will stop working, and the slide cylinder will remain in the extended position, keeping the corresponding inner box full of 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 the dangerous handling condition. The blower works to discharge the gas and smoke, so that the inner box is in a negative pressure or vacuum state. The multi-way solenoid valve is connected to the feeding component that supplies the 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 carries 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 handling condition, shortens the handling process, and responds to the sudden temperature rise of the control transformer.

[0034] S7. A portion of the multiple feeders can be used to store the electronic cleaning fluid separately. The detection structure has a pre-stored periodic cleaning time. Even if the temperature is at a preset reasonable threshold, the multi-way solenoid valve of the release mechanism is connected to the feeder that supplies the electronic cleaning fluid. The electronic cleaning fluid is sprayed into the inner box through the nozzle to achieve periodic live cleaning of the control transformer. This prevents abnormal temperature of the control transformer caused by dust accumulation. It can also spray flame-retardant gas and electronic cleaning fluid simultaneously in high temperature and fire conditions, and assist high-speed air in spraying and cleaning the transformer. It can also cooperate with flame-retardant gas for efficient cooling and fire extinguishing in the open flame stage.

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

[0036] (1) Through overall optimization, the present invention combines the cabinet and inner box to form multiple separate partition spaces, and installs the control transformers of multiple branches separately. The space of the inner box is smaller, which allows for more targeted detection of the temperature status of a certain control transformer, more accurate temperature detection and cooling, more timely detection of temperature abnormalities, and plays a role in isolation to avoid mutual influence between multiple control transformers.

[0037] (2) By setting up a negative pressure mechanism, the negative pressure mechanism can uniformly control the ventilation of all inner boxes during normal use. When a certain control transformer has an abnormal temperature, the negative pressure mechanism changes the air intake channel and connects to the corresponding inner box separately. It can generate a continuous airflow with a large flow rate in a channel with a small inner diameter, and use the high-speed air jet generated by the exhaust hole to perform targeted air cooling of the control transformer.

[0038] (3) By setting up 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 down to seal the inner box, so that a sealed flame-retardant atmosphere is formed in the inner box. The release mechanism can also continuously supply flame-retardant gas to form a dynamic flame-retardant atmosphere in the inner box, remove the heat in the inner box, delay and suppress open flame fires, provide staff with a longer response time, and ensure that the equipment is controllable as much as possible before personnel intervene. Attached Figure Description

[0039] Figure 1 This is a first-view structural diagram of the present invention;

[0040] Figure 2 This is a structural schematic diagram of the present invention with the cabinet removed;

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

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

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

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

[0045] Figure 7 This is a schematic diagram of the release mechanism of the present invention in its non-operating state;

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

[0047] Figure 9 This is a cross-sectional schematic diagram of the slide tube of the release mechanism of the present invention in a shortened state;

[0048] Figure 10 This is a cross-sectional schematic diagram of the slide tube of the release mechanism of the present invention in an extended state;

[0049] Figure 11 This is a schematic diagram of another slide structure of the release mechanism of the present invention.

[0050] Attached reference numerals: 1. Cabinet; 2. Main circuit breaker; 3. Conductive mechanism; 31. Main board; 32. Support plate; 33. Connector; 331. Pressure block one; 332. Pressure block two; 333. Positioning slot one; 334. Positioning slot two; 34. Arc plate; 4. Inner box; 41. Main body; 42. Top cover; 43. End plate; 44. Drain hole; 45. Partition plate; 46. Slide plate; 461. Extension plate; 47. Limiting frame; 5. Negative pressure mechanism; 51. Exhaust component; 511. Blower; 512. Middle section shell; 513. 514. End shell; 515. Flip plate; 516. Through port; 517. Linkage component; 52. Relay pipe; 53. Communicating device; 6. Control transformer; 74. Release mechanism; 75. Multi-way solenoid valve; 76. Slide cylinder; 77. Fixed cylinder; 78. Inner sleeve; 79. Guide plug; 70. Outlet pipe one; 71. Piston head; 72. Moving cylinder; 72. Outlet pipe two; 72. Spring holder; 73. Clamping plate; 74. Three-way valve assembly; 75. Nozzle; 76. Hose; 77. Feeding component; 8. Detection structure. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0052] like Figure 1 - Figure 11As shown, this embodiment provides a temperature-adjustable low-voltage switchgear, including a cabinet 1 with an internal frame and a movable door at the front end. Side panels are installed around the cabinet, and air inlets are opened at the bottom of the side panels or the bottom of the side panels to allow external air to enter the cabinet 1. It also includes a main circuit breaker 2 and multiple control transformers 6. The main circuit breaker 2 is installed on the upper inner side of the cabinet 1 for easy connection with the busbar entering from the top.

[0053] Multiple control transformers 6 are distributed within the cabinet 1. The main circuit breaker 2 and the multiple control transformers 6 are electrically connected via a conductive mechanism 3. (Refer to...) 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 equipment under abnormal operating conditions.

[0054] The practical problem addressed by this solution is how to troubleshoot and cool down insufficient heat dissipation when abnormal temperatures occur, and how to suppress open flames as much as possible in environments with uncontrollable temperatures, thus buying time for maintenance personnel to prevent further damage. The following configuration is specifically provided:

[0055] Set the inner box 4, refer to Figure 1 The inner box 4 is fixed in the cabinet 1, and multiple inner boxes 4 are arranged equidistantly on the internal frame of the cabinet 1. There is an isolation gap between adjacent inner boxes 4. In use, if there is flowing air in the cabinet 1, the air can flow between the inner boxes 4, and the inner boxes 4 can be cooled and dissipated by contacting the flowing air in the cabinet 1.

[0056] Among them, reference Figure 6 The inner box 4 includes a main body 41, which is a hollow thin-walled structure that provides 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 interference in case of excessive temperature or local fire.

[0057] Furthermore, 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, upper and lower. The control transformer 6 is installed in the lower part, and the upper part is used to install other similar release mechanisms 7, feeding components 8 and detection structures 9, which serve as a partition and protection function, and also ensure the cleanliness 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, etc., providing temperature detection function and providing electrical signals for the subsequent specific temperature processing process.

[0058] Meanwhile, the main body 41 has a drain hole 44 on its side wall. The drain hole 44 is a horizontally arranged through hole with multiple rows arranged vertically to facilitate the entry and exit of air into and out of the main body 41. The main body 41 has a sliding plate 46 corresponding to the drain hole 44. The sliding plate 46 can block and open the drain hole 44 to control the airflow.

[0059] Optimize negative pressure mechanism 5, refer to Figure 1 and Figure 2 The negative pressure mechanism 5 is fixed in the cabinet 1. The negative pressure mechanism 5 includes an exhaust component 51, which is an active component. In the working state, the exhaust component 51 can exhaust the air in the cabinet 1. At the same time, the exhaust component 51 is connected to the internal space of the inner box 4. That is, the exhaust component 51 can exhaust the air in the inner box 4 from the cabinet 1. At the same time, the exhaust component 51 can control the ratio of air intake from the cabinet 1 and the inner box 4. That is, it can change the amount of air intake from the cabinet 1 and the inner box 4 to adapt to different usage scenarios. For example, when the temperature of a certain inner box 4 rises, it can exhaust air separately from that inner box 4. At this time, the amount of air entering from the exhaust hole 44 increases, which can generate a jet of air with a larger flow rate 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 installed inside the inner box 4. The release mechanism 7 is an actuator connected to multiple feeding devices 8, which respectively provide flame-retardant gas. The feeding devices 8 can be a complete set of equipment with a storage tank and a pump. They can be installed inside the cabinet 1 or nearby and connected to the release mechanism 7 through pipes. Furthermore, flame-retardant gas or electronic cleaning fluid can be stored in different feeding devices 8. At the same time, inert gas and flame-retardant electronic cleaning fluid are prepared. This redundant design allows for efficient high-speed cooling and dust removal during the high-speed purging stage, avoiding overheating caused by insufficient heat dissipation. During the open flame stage, the electronic cleaning fluid can also play a role in spraying fire extinguishing, resulting in faster fire handling and higher safety.

[0061] Meanwhile, to avoid affecting the surrounding control transformer 6 and to provide the specific required state, the release mechanism 7 can drive the slide plate 46 to close the exhaust hole 44 when the feeding component 8 provides flame-retardant gas or electronic cleaning fluid to the inner box 4. The exhaust component 51 stops the suction action, providing flame-retardant gas to the inner box 4 to form a sealed flame-retardant atmosphere. It can also reduce the consumption of flame-retardant gas, ensure the existence of the flame-retardant atmosphere as long as possible, and provide preparation time for personnel to intervene. Moreover, when the temperature is too high under the flame-retardant atmosphere, the exhaust component 51 can restart the suction action. The flame-retardant gas in the feeding component 8 continues to flow into the inner box 4 and carries heat out from the exhaust component 51. The electronic cleaning fluid can also be sprayed at the same time. Under the dynamic flame-retardant atmosphere, the rate of temperature rise can be suppressed, and the equipment condition can be kept under control as much as possible before personnel intervention.

[0062] Alternatively, a separate drive unit can be set to drive the slide plate 46, such as an electric telescopic rod or other power source. However, it is necessary to ensure that the drive unit and the release mechanism 7 work synchronously. Synchronization can be achieved through electronic 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 feeder 8 that provides flame-retardant gas or electronic cleaning fluid 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 housing to disperse the material and ensure that the entire internal space of the inner box 4 is covered.

[0064] Meanwhile, a slide cylinder 72 is connected in series between the nozzle 74 and the multi-way solenoid valve 71. The slide cylinder 72 is arranged vertically, and its top extends through the partition 45 to the upper part of the inner box 4 so as to connect with the multi-way solenoid valve 71 through a pipe. The slide cylinder 72 acts as a relay to smoothly transport materials from the multi-way solenoid valve 71 to the nozzle 74. The slide cylinder 72 extends when the multi-way solenoid valve 71 provides flame-retardant gas and electronic cleaning fluid to the nozzle 74. This extension action can serve as the 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 cylinder 72 corresponding to the slide plate 46. The upper end of the slide cylinder 72 is fixed, and the lower end of the slide cylinder 72 and the top surface of the extension plate 461 slide in contact. A limit frame 47 is installed between the slide plate 46 and the end plate 43. The limit frame 47 ensures that the slide plate 46 is vertical when sliding. During the conveying process, the slide cylinder 72 extends and presses the slide plate 46 downward, so that the slide plate 46 blocks the discharge hole 44. No other power source or synchronous control equipment is required, and the structure is more stable.

[0066] In a further embodiment, an installation structure for a sliding plate 46 is provided, wherein an end plate 43 is hingedly installed on the side of the main body 41 facing the door of the cabinet 1. The end plate 43 can be lifted upwards. A limiting frame 47 is fixed to the upper part of the rear side wall of the end plate 43. The limiting frame 47 has a round rod. A sleeve that cooperates with the round rod is installed at the bottom of the end plate 43. The sliding plate 46 is slidably installed on the rear side wall of the end plate 43, so that the sliding plate 46 can be exposed when the end plate 43 is lifted upwards, which facilitates later maintenance.

[0067] Meanwhile, the end plate 43 and the slide plate 46 are provided with drainage holes 44, as shown in the reference. Figure 7 When no downward pressure is applied, the tension spring aligns the outlet holes 44 of the slide plate 46 with the outlet holes 44 of the end plate 43, ensuring unobstructed airflow. (Refer to...) Figure 8When the slide cylinder 72 extends, the slide plate 46 is pressed down and slides by the slide cylinder 72. The positions of the drainage holes 44 of the slide plate 46 and the drainage holes 44 of the end plate 43 are offset. Since the distance between adjacent drainage holes 44 is greater than the inner diameter of the drainage holes 44, when the slide plate 46 moves down by the distance of one drainage hole 44, the drainage holes 44 can be completely offset, thus achieving the sealing of the drainage holes 44.

[0068] Furthermore, 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 down, the tension spring is stretched and stores force. When the slide cylinder 72 shortens, the slide plate 46 will be driven back to its original position by the tension spring, maintaining a position where air can flow freely. The end plate 43 can be lifted forward, which also facilitates the inspection of the internal detection structure 9 and control transformer 6.

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

[0070] Meanwhile, an outlet pipe 724 is installed through the side wall of the fixed cylinder 721, and an outlet pipe 727 is installed through the side wall of the moving cylinder 726. Materials can flow out from these two points. The outlet pipe 724 and the outlet pipe 727 are connected to the nozzle 74 through the three-way valve assembly 73. The specific flow point is controlled by a three-way valve in the three-way valve assembly 73.

[0071] Specifically, refer to Figure 9 The three-way valve connects outlet pipe 727 to nozzle 74, completing the material supply. (Refer to...) Figure 10 When no material supply is required and the slide 72 needs to be kept in the extended state, the three-way valve assembly 73 connects the outlet pipe 1 724 and the outlet pipe 2 727, and the multi-way solenoid valve 71 disconnects from the slide 72, so that the material is sealed inside the slide 72 and will not enter the nozzle 74. At the same time, the slide 72 can be kept in the extended state when it is filled with high-pressure material. When unlocking is required, the three-way valve assembly 73 can directly introduce 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 of the fixed cylinder 721 corresponding to the top of the moving 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. This can limit the extreme position of the upward movement of the moving cylinder 726, preventing the moving cylinder 726 from moving too high and causing the bottom end of the fixed cylinder 721 to directly contact and wear or bump the outlet pipe 727, thus ensuring the stability of the outlet pipe 727 and the pipeline structure connected to the outlet pipe 727.

[0073] In a further embodiment, to achieve simultaneous exhaust of the cabinet 1 and the inner box 4, a specific configuration of the exhaust component 51 is disclosed, referring to... Figure 3 The exhaust component 51 includes a blower 511, which is arranged front to back. When working, it delivers air from the front to the rear. The blower 511 is embedded and fixed on the rear side panel of the cabinet 1 and communicates with the external air. A middle section shell 512 that runs through the front and back is installed at the air inlet of the blower 511. The outer contour of the middle section shell 512 is cylindrical and hollow. A relay pipe 52 is installed through the circumferential side wall of the middle section shell 512. The relay pipe 52 is connected to the internal space of the main body 41 through a connector 53.

[0074] Preferred, 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. The upper and lower ports of the three-way pipe are used to connect the relay pipe 52. When it is necessary to connect with the inner box 4, the corresponding butterfly valve is opened; otherwise, it is closed. This can complete the evacuation action of a single inner box 4 as well as the simultaneous evacuation action of all inner boxes 4.

[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 from front to back. The front end of the end shell 513 has a through-hole 515. Flip plates 514 are closely arranged in the through-hole 515. The flip plates 514 have a horizontal central axis. If connection is required, the flip plates 514 will rotate no more than 90 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 flip plates 514 rotate synchronously. When it is necessary to control the proportion of air drawn from the cabinet 1 and the inner box 4, the tilt angle of the flip plates 514 is increased, so that more air enters the middle shell 512 from the through-hole 515, thereby increasing the amount of air drawn from the cabinet 1.

[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 through the opening 515, which can reduce the amount of air drawn from the cabinet 1. That is, the flap 514 can rotate from the vertical state to the horizontal state, and there is a linkage 516 between the flaps 514.

[0077] Specifically, the linkage 516 can be a combination of a double-groove synchronous pulley and a synchronous belt. The double-groove synchronous pulley is installed at the end of the central shaft, and the synchronous belt is sleeved between adjacent double-groove synchronous pulleys. One of the double-groove synchronous pulleys is connected to the motor, which can realize synchronous rotation drive. 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. It can be selected according to the application scenario.

[0078] In a further embodiment, a mechanically self-locking slide 72 is disclosed, with reference to Figure 11 The slide 72 includes a fixed cylinder 721 and a moving cylinder 726. The space in the middle of the fixed cylinder 721 and the moving cylinder 726 is connected to the multi-way solenoid valve 71. 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 moving cylinder 726. A clamping plate 729 is installed at one end of the moving cylinder 726 inside the fixed cylinder 721 through a spring bracket 728. A clamping plate 729 is installed at the top of the moving cylinder 726 through a spring bracket 728.

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

[0080] The mechanical locking structure is simple and stable, ensuring that the slide cylinder 72 will always remain in the extended position and will not retract after it is extended. However, it is necessary to periodically check for 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 required, the material is fed directly through the hose 75. The inner sleeve 722 is equipped with a guide plug 723 at the top opening of the moving cylinder 726. The guide plug 723 is cylindrical and fixed to the lower part of the inner sleeve 722. It has a flat section at the front end, and the front end of the vertical inner wall of the moving cylinder 726 also has a matching flat section. After the moving cylinder 726 is extended, the guide plug 723 still slides in contact with the inner wall of the moving cylinder 726.

[0081] Appendix Figure 11 To illustrate this positional relationship, guide plug 723 is cut in half, leaving only the upper and lower sections. These sections are labeled; there are not two guide plugs 723. This explanation is provided to avoid misunderstanding (see reference...). Figure 10 The guide plug 723 in the middle makes the moving cylinder 726 slide and limit it, so that it can only slide vertically and cannot rotate. This prevents the moving cylinder 726 from rotating and causing the hose 75 to get wrapped around the outside of the moving cylinder 726, ensuring smooth material supply 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 moving cylinder 726. Except for the front flat surface, the outer circumference of the guide plug 723 does not contact the inner circumference of the moving 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 staggered and extend from top to bottom, providing more mounting positions in the height direction to accommodate multiple stacked inner boxes 4 and control transformers 6, as well as a support plate 32 connected in parallel to the main board 31. The support plate 32 is horizontally arranged, passes through the inner box 4 and connects to the control transformer 6, facilitating the parallel connection of multiple control transformers 6. Bolt holes are opened 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. To facilitate the alignment of the bolts, a connector 33 is installed at the connection position between the main board 31 and the support plate 32. The connector 33 can keep the mounting end of the support plate 32 flush with the vertical side wall of the main board 31. The connector 33 assists in aligning the support plate 32 with the main board 31, reducing the difficulty of installation in narrow spaces and ensuring installation quality.

[0084] In a further embodiment, a specific connector 33 is disclosed, referring to... Figure 4 When installing multiple motherboards 31 and multiple support boards 32, the connector 33 includes a first pressure block 331 and a second pressure block 332. The first pressure block 331 and the second pressure block 332 are detachably connected by threading. The multiple support boards 32 can be aligned with the motherboards 31 by first using the first pressure block 331 and the second pressure block 332.

[0085] Specifically, pressure block 331 and pressure block 332 are provided with vertical grooves facing the main board 31. When pressure block 331 and pressure block 332 approach the main board 31 from the left and right sides, the main board 31 can be locked in the vertical grooves. The end of the support plate 32 is provided with a right-angle bend. The support plate 32 is provided with a horizontally extending arc plate 34 at the right-angle bend. The arc plate 34 has a horizontally extending axis. Pressure 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 makes it easy to be locked on the support plate 32 from bottom to top and penetrates the left and right side walls of pressure block 331.

[0086] A circular arc-shaped blind groove corresponding to the arc plate 34 is formed on the left half of the pressure block 331. When the pressure block 331 moves to the left and closer to the main board 31, the right end of the arc plate 34 is inserted into the positioning groove 333, which can pull the support plate 32 to the left. The height of the support plate 32 can be changed by moving the pressure block 331 up and down. A positioning groove 334 is provided on the pressure block 332 corresponding to the arc plate 34. The positioning groove 334 is a circular arc-shaped blind groove with an opening to the right. When the pressure block 331 moves to the right and closer to the main board 31, the left end of the arc plate 34 is inserted into the positioning groove. In slot 333, after pressure block 331 and pressure block 332 are connected by threaded connection, they can move all support plates 32 up and down and left and right together. With the setting of vertical slot, the reserved bolt holes on the main board 31 and support plate 32 are aligned one by one. Then, the main board 31 and support plate 32 are fixed one by one by bolts. This reduces the situation where bolt holes cannot be aligned due to deformation or dimensional error of individual main board 31 and support plate 32. It also prevents bolt holes from stripping or bolts from tilting due to violent installation in an misaligned state, and ensures smooth installation.

[0087] In a further embodiment, the main body 41 is structurally optimized, referring to... Figure 1 and Figure 2 The main body 41 has lugs at its bottom, which are detachably connected to the frame of the cabinet 1 by bolts, allowing the main body 41 to be removed from the cabinet 1. A top cover 42 is movably installed on the top of the main body 41. (Refer to...) Figure 5 The top cover 42 can be hinged, and the feeding component 8 inside can be exposed when it is lifted up. The main body 41 is located between the top cover 42 and the partition 45 and a placement rack is installed. The feeding component 8 is horizontally inserted into the middle of the placement rack.

[0088] Disposable feeders 8 can be installed, such as high-pressure storage tanks, eliminating the need for complete sets of flame-retardant gas and electronic cleaning fluid supply equipment, thus reducing manufacturing and usage costs. The disposable feeder 8 can be replaced simply by opening the top cover 42, making maintenance convenient. Alternatively, the top cover 42 can be installed by sliding it back and forth with the main body 41 (not shown in the figure, similar to a drawer structure). The top cover 42 can be removed by pulling it forward, requiring less space to replace the feeder 8. With the partition space left between the inner boxes 4, the feeder 8 can be replaced without disassembling the inner boxes 4.

[0089] A method for temperature control of a low-voltage switchgear includes the following steps:

[0090] Step 1: The detection structure 9 has a single-chip microcomputer as its carrier and multiple expansion interfaces, which can be used to install temperature sensors, smoke sensors and gas concentration sensors. The detection structure 9 detects the internal temperature of the inner box 4 through the temperature sensor. When the temperature is within a preset reasonable threshold, the equipment is in normal working condition. The flap 514 of the negative pressure mechanism 5 is tilted, 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 pipe 52. The blower 511 works to exhaust the air inside the cabinet 1 and the inner box 4. Outside air is simultaneously replenished into the cabinet 1 and the inner box 4 through the air inlet at the top of the cabinet 1 and the exhaust hole 44 on the side wall of the inner box 4, thus completing the ventilation and cooling of the cabinet 1 and the inner box 4.

[0091] Step 2: When the temperature of a certain inner chamber 4 exceeds a reasonable threshold, the temperature sensor in the detection structure 9 of that inner chamber 4 detects that the temperature has entered the preset high-temperature threshold, and the equipment enters a high-temperature operating condition. The flap 514 of the negative pressure mechanism 5 is in a vertical state, isolating the blower 511 from the interior of the cabinet 1. The connector 53 connects the corresponding high-temperature inner chamber 4 to the blower 511 alone, while the other inner chambers 4 are disconnected from the blower 511. The blower 511 operates only to quickly exhaust the air inside the corresponding inner chamber 4, and outside air quickly replenishes the air through the exhaust holes 44 on the side wall of the inner chamber 4. The airflow enters the inner box 4, forming a high-speed air jet from front to back, which quickly cools the control transformer 6, increases the airflow velocity inside the inner box 4, and achieves rapid cooling of the inner box 4. It can also blow away the dust accumulated inside the inner box 4, eliminate abnormal temperatures caused by insufficient heat dissipation, and the isolation gap ensures that the inner boxes 4 do not affect each other, ensuring smooth airflow in the cabinet 1 and rapid entry into the inner box 4. It can also prevent 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 fluid can also be sprayed at the same time. The electronic cleaning fluid can be Fluorinet FC-43 fluorinated liquid, Paiqi nano circuit board cleaner, or other flame-retardant electronic cleaning fluids. While spraying and cooling, it will not conduct electricity or promote combustion, improving the dust cleaning efficiency and cooling speed.

[0092] Step 3: When the equipment operates at high temperature for more than the preset time, that is, after a period of targeted rapid cooling, if 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 the first control signal, and the equipment enters the dangerous handling condition. At this time, the blower 511 continues to work only to quickly exhaust the air inside the corresponding inner box 4. At the same time, the circuit breaker operates to disconnect the corresponding control transformer 6 from the conductive mechanism 3. At this time, the branch is in a power-off state, protecting the electrical equipment on the branch. The multi-way solenoid valve 71 of the release mechanism 7 is connected to the feeding component 8 that supplies the flame-retardant gas. The flame-retardant gas uses inert gases such as nitrogen, which has the ability to suppress flames. The internal pressure of the slide cylinder 72 increases, causing the moving cylinder 726 to extend downward, pushing the slide plate 46 to discharge the gas through the hole. 44 is sealed. When the blower 511 is working, it can quickly draw 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 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 to upload danger signals through a network module or directly connect to a strobe and buzzer alarm to remind the user to pay attention and deal with it in time. During the waiting process, the inner box 4 is kept in a state of being filled with flame-retardant gas and in a sealed flame-retardant atmosphere to delay ignition or further deterioration of the situation.

[0093] Step 4: When the smoke sensor of the detection structure 9 detects smoke in the inner box 4, the flame-retardant atmosphere fails, and oxygen may have entered, causing the atmosphere to be destroyed. That is, the fire is not under control. The blower 511 works to discharge the gas and smoke, putting the inner box 4 in a negative pressure or vacuum state, and simultaneously extracting the air and flame-retardant gas inside the inner box 4. At the same time, the multi-way solenoid valve 71 is connected to the feeder 8 that supplies flame-retardant gas and electronic cleaning fluid. By simultaneously supplying flame-retardant gas and electronic cleaning fluid to the inner box 4, the newly entered flame-retardant gas can replace the extracted mixed gas. The purer flame-retardant gas can keep the inner box 4 in a dynamic flame-retardant atmosphere. The spraying of electronic cleaning fluid synchronously extinguishes the fire and sprays the temperature of the control transformer 6, accelerating the temperature control process of the control transformer 6.

[0094] Step 5: In extreme environments, when the temperature sensor of detection structure 9 detects that the temperature is higher than the reasonable threshold, or the temperature sensor detects that the temperature is rising rapidly and the rate of temperature rise exceeds the preset safe rate of temperature rise, and the smoke sensor also detects that smoke is generated in the inner box 4, detection structure 9 directly sends a second control signal, and the equipment directly enters the dangerous handling condition. Instead of rapid cooling of the air, it directly supplies flame-retardant gas and electronic cleaning fluid in a closed state, quickly extracts the air in the inner box 4 to form a flame-retardant atmosphere, and simultaneously sprays liquid to cool down and extinguish the fire, shortening the handling process and dealing with the sudden temperature rise of the control transformer 6.

[0095] Step 6: The detection structure 9 stores the periodic cleaning time. Even if the temperature is at a preset reasonable threshold, the multi-way solenoid valve 71 of the release mechanism 7 is connected to the feeder 8 that supplies electronic cleaning fluid. Electronic cleaning fluid is sprayed into the inner box 4 through the nozzle 74 to achieve periodic live cleaning of the control transformer 6. This prevents abnormal temperature of the control transformer 6 due to dust accumulation. A drain pipe can be installed at the bottom of the inner box 4, and a water pump is connected to the lower end of the drain pipe. The drain pipe will drain the electronic cleaning fluid accumulated in the inner box 4 in time, avoiding the control transformer 6 from being soaked in electronic cleaning fluid for a long time.

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

Claims

1. A low-voltage switchgear with adjustable temperature, comprising a cabinet (1), characterized in that, Also includes: A main circuit breaker (2) and multiple control transformers (6), the main circuit breaker (2) and the control transformers (6) being electrically connected via a conductive mechanism (3); Multiple inner boxes (4) are fixed in the cabinet (1). The inner box (4) includes a main body (41), a detection structure (9) and a control transformer (6) are installed in the main body (41). The side wall of the main body (41) is provided with a drain hole (44), and the main body (41) is provided with a sliding plate (46) corresponding to the drain hole (44). The release mechanism (7) is placed in the inner box (4). The release mechanism (7) is connected to multiple feeding parts (8). The feeding parts (8) store flame-retardant gas. When the release mechanism (7) inputs the flame-retardant gas inside the feeding parts (8) into the inner box (4), it can drive the slide plate (46) to close the discharge hole (44). The negative pressure mechanism (5) includes an exhaust component (51), which is connected to the cabinet (1) and the inner box (4) respectively. The exhaust component (51) can control the ratio of air intake from the cabinet (1) and the inner box (4). The exhaust component (51) includes a blower (511), a middle section shell (512) is installed at the air inlet of the blower (511), the middle section shell (512) is connected to the main body (41), an end shell (513) is installed at the front end of the middle section shell (512), a flap (514) that can close the opening (515) is installed at the end of the end shell (513), a relay pipe (52) is installed through the circumferential side wall of the middle section shell (512), and the relay pipe (52) is connected to the internal space of the main body (41) through a connector (53).

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

3. The low-pressure switchgear with adjustable temperature according to claim 2, characterized in that, The main body (41) is hinged to one end of the cabinet (1) with a door opening and an end plate (43) is installed. Both the end plate (43) and the slide plate (46) are provided with drainage holes (44). The extension of the slide cylinder (72) can drive the end plate (43) to move down so that the drainage holes (44) on the end plate (43) are completely misaligned with the drainage holes (44) on the slide plate (46).

4. The low-pressure switchgear with adjustable temperature according to claim 3, characterized in that, The slide tube (72) includes a fixed tube (721) and a moving tube (726). The moving tube (726), the fixed tube (721) and the multi-way solenoid valve (71) are connected in sequence. The fixed tube (721) and the moving tube (726) are respectively connected to the nozzle (74) through a three-way valve assembly (73).

5. The low-pressure switchgear with adjustable temperature according to claim 3, characterized in that, The slide tube (72) includes a fixed tube (721) and a moving tube (726). The moving tube (726) is connected to the nozzle (74) through a hose (75). An outlet pipe (724) is installed through the side wall of the fixed tube (721). A clamping plate (729) is installed at one end of the moving tube (726) inside the fixed tube (721) through a spring frame (728). The clamping plate (729) seals the outlet pipe (724) when the moving tube (726) extends out of the fixed tube (721).

6. The low-pressure switchgear with adjustable temperature according to claim 1, characterized in that, The conductive mechanism (3) includes 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). A connector (33) is installed at the connection position between the main board (31) and the support plate (32).

7. The low-voltage switchgear with adjustable temperature according to claim 6, characterized in that, The connector (33) includes a first pressure block (331) and a second pressure block (332). The first pressure block (331) and the second pressure block (332) are connected by threading. The end of the support plate (32) is provided with a right-angle bend. The support plate (32) is provided with a horizontally extending arc plate (34) at the right-angle bend. The first pressure block (331) is provided with a positioning groove (333) corresponding to the arc plate (34) and the support plate (32). The second pressure block (332) is provided with a positioning groove (334) corresponding to the arc plate (34).

8. A method for temperature control of a low-voltage switchgear, using the temperature-adjustable low-voltage switchgear as described in claim 4, characterized in that, Includes the following steps: 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 discharge the air inside the cabinet (1) and the inner box (4) simultaneously. S2. When the temperature of the inner box (4) rises, the detection structure (9) detects that the temperature has entered the preset high temperature threshold. The flap (514) of the negative pressure mechanism (5) is in a vertical state. The communicating vessel (53) makes the blower (511) only used for the air discharge of the corresponding inner box (4). The external air narrows and speeds up through the outlet hole (44) to achieve high-speed purging and cooling of the corresponding control transformer (6). S3. After the equipment is in a high-temperature condition for more than the preset time point, if the temperature detected by the detection structure (9) is still not lower than the high temperature threshold, the corresponding control transformer (6) is de-energized, and the release mechanism (7) supplies flame-retardant gas to the inner box (4) through the feeding component (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 seal the inner box (4) until the detection structure (9) detects that the concentration of flame-retardant gas is higher than the preset minimum safety value, the blower (511) stops working, and the slide cylinder (72) remains extended to keep the corresponding inner box (4) in a sealed flame-retardant atmosphere. S4. When the detection structure (9) detects smoke in the inner box (4), the blower (511) starts working to put the inner box (4) under negative pressure. The feeding component (8) continuously supplies flame-retardant gas to the inner box (4). The continuous replenishment of flame-retardant gas keeps the corresponding inner box (4) in a dynamic flame-retardant atmosphere. The flowing flame-retardant gas carries heat out of the inner box (4).

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