Intelligent temperature monitoring and overheating protection frequency converter

Abstract

The invention relates to an intelligent temperature monitoring and overheating protection frequency converter, in particular to the technical field of electrical components, which comprises a frequency converter box body, shutter sheets are arranged on the frequency converter box body, a main control cavity and a regulation and control cavity are arranged in the frequency converter box body, a heat insulation plate is arranged between the main control cavity and the regulation and control cavity of the frequency converter box body, and a temperature sensor is arranged on the heat insulation plate. A regulation and control cabinet is arranged in a regulation and control cavity of the frequency converter box body, a double-shaft electric push rod is arranged on the regulation and control cabinet, a connecting piece is arranged on the double-shaft electric push rod, a fixing column is arranged on the connecting piece, a rack is arranged on the fixing column, a rotating shaft is arranged on the shutter pieces, a gear is arranged on the rotating shaft, and a temperature sensor triggers the double-shaft electric push rod to start to drive the connecting piece to move. The rack and the gear on the fixing column are meshed to drive the rotating shaft to rotate and further drive the shutter sheets to rotate and open, so that the shutter sheets cancel the closing effect on the frequency converter box body, air convection inside and outside the frequency converter box body is achieved, automatic heat dissipation is achieved, and the heat dissipation efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical components, and particularly to a variable frequency drive with intelligent temperature monitoring and overheat protection. Background Art

[0002] A variable frequency drive (VFD) is a power control device that applies frequency conversion technology and microelectronics technology to control an alternating current motor by changing the operating power frequency of the motor. It mainly adjusts the voltage and frequency of the output power supply by the on-off of the internal IGBT (Insulated Gate Bipolar Transistor). The variable frequency drive protects the motor and stabilizes the operation of the motor by virtue of its speed regulation and energy saving, thereby improving the working efficiency of the system.

[0003] However, during the operation of the variable frequency drive, power devices inside it, such as IGBT modules, will generate losses resulting in energy loss and release heat in the form of heat energy. The generated heat causes the temperature of the variable frequency drive to rise, which will have an adverse impact on damaging the insulation performance of the motor and damaging the variable frequency drive itself. Excessive temperature is extremely likely to cause faults such as aging, deterioration, and short circuit of parts such as electrical circuits, power supply circuits, and mechanical circuits, thus leading to serious consequences such as fires. Therefore, the variable frequency drive needs to have certain heat dissipation performance.

[0004] The heat dissipation of the variable frequency drive usually installs a cooling fan inside the variable frequency drive for air cooling. This heat dissipation method requires additional investment in control equipment such as variable frequency drives, increases costs, and requires regular maintenance.

[0005] Based on this, in order to reduce costs and perform automatic temperature reduction treatment on the temperature inside the variable frequency drive, the present invention proposes a variable frequency drive with intelligent temperature monitoring and overheat protection. Summary of the Invention

[0006] According to the problems raised in the background art, the present invention provides a variable frequency drive with intelligent temperature monitoring and overheat protection to solve them. Next, the present invention will be further elaborated.

[0007] A variable frequency drive with intelligent temperature monitoring and overheat protection includes a variable frequency drive box body. The variable frequency drive box body is provided with louver blades. The variable frequency drive box body is internally provided with a main control cavity and a regulation cavity. An insulation board is provided between the main control cavity and the regulation cavity of the variable frequency drive box body. A temperature sensor is provided on the insulation board. A regulation cabinet is provided in the regulation cavity of the variable frequency drive box body. A heat dissipation component for heat dissipation is provided in the regulation cabinet. The heat dissipation component includes a double-axis electric push rod. The double-axis electric push rod is provided on the regulation cabinet. A connecting piece is provided on the double-axis electric push rod. A fixed column is provided on the connecting piece. A rack is provided on the fixed column. A rotating shaft is provided on the louver blade. A gear is provided on the rotating shaft. By means of the temperature monitoring of the temperature sensor, the double-axis electric push rod is triggered to start, achieving the effect of automatically opening the louver blades for heat dissipation.

[0008] Preferably, ventilation slots are provided on the main control cavity of the inverter case, and dustproof nets are provided in the ventilation slots of the inverter case. The ventilation slots can accelerate the air flow in the inverter case, and the dustproof net is intended to prevent dust from entering the inverter case.

[0009] Preferably, a cleaning assembly is provided on the ventilation groove of the main control cavity of the inverter case, and the cleaning assembly includes a connecting shaft fixedly connected to the ventilation groove of the main control cavity of the inverter case, and a knocking piece is provided on the connecting shaft. The knocking piece is built into the ventilation groove in the inverter case and fits the dust net.

[0010] Preferably, a torsion spring is provided between the knocking piece and the inverter housing, the torsion spring is wound around the connecting shaft, a rotating assembly is provided on the rotating shaft, the rotating assembly includes a cam fixed to the rotating shaft, a guide piece is provided on the cam, a pushing piece is provided on the guide piece, a guide rail is provided between the pushing piece and the inverter housing, a wedge block is slidably connected on the pushing piece, a force storage spring is provided between the wedge block and the pushing piece, the knocking piece is rotated and reset with the aid of the rotating assembly, thereby achieving the cleaning effect of the knocking piece vibrating the dustproof net.

[0011] Preferably, a shock-absorbing pad is provided at the bottom of the inverter case to ensure that the inverter case remains stable during operation.

[0012] Preferably, an alarm is provided on the inverter case, a fire extinguisher is provided in the control chamber of the inverter case, an air pipe is provided on the fire extinguisher, the air pipe passes through the insulation board and goes deep into the main control chamber of the inverter case, an alarm is used to give a warning, and relevant personnel are reminded to cut off the power in time, and the fire is extinguished by the fire extinguisher.

[0013] Preferably, a closing component is provided on the inverter case, and the closing component includes a closing piece slidingly connected to the inverter case, and a sliding groove is opened on the inner wall of the main control cavity of the inverter case. The closing pieces are all slidingly connected in the sliding groove of the inverter case. The sliding groove is opened on the inner wall of the main control cavity of the inverter case so that the closing pieces have space to move.

[0014] Preferably, connecting columns are provided in the slide grooves of the inverter case, the closing piece is slidably connected to the adjacent connecting columns, a pressure spring is provided between the closing piece and the inverter case, the pressure spring is wound around the connecting column, the closing piece is connected with a pull rope, the pull rope passes through the insulation board and extends into the control cavity, a moving part is fixedly connected to the pull rope, the moving part is fixedly connected to the output shaft of the dual-axis electric push rod, a connecting rod is provided on the control cavity of the inverter case, a pulley is provided on the connecting rod, and a pull rope is wound around the pulley, and the ventilation slot on the inverter case is closed by moving the closing piece to ensure the fire extinguishing effect of the fire extinguisher.

[0015] Preferably, air holes are provided on the frequency converter box body to facilitate the release of carbon dioxide in the fire extinguisher.

[0016] Beneficial effects: Compared with the prior art, the present invention has the following advantages:

[0017] 1. The temperature of the device is monitored through a temperature sensor, triggering the start of the double-axis electric push rod, driving the connecting piece to move, the rack on the fixed column meshing with the gear, causing the rotating shaft to rotate, and then the louver blades to rotate and open, canceling the sealing effect on the frequency converter box body, enabling air convection inside and outside the frequency converter box body, and realizing automatic heat dissipation treatment.

[0018] 2. By providing ventilation slots on the main control cavity of the frequency converter box body to accelerate heat dissipation, and providing dust-proof nets on the ventilation slots to prevent dust from entering the interior of the frequency converter. Through the rotation of the rotating shaft and the cam, the guide piece, the pushing piece, and the wedge block are linked. Through the extrusion of the wedge block and the knocking piece, the knocking piece rotates and resets, thereby realizing the vibration effect of the knocking piece on the dust-proof net and achieving the purpose of cleaning.

[0019] 3. The start of the fire extinguisher is triggered by the temperature sensor, automatically extinguishing the fire when a fire occurs. At the same time, the output shaft of the double-axis electric push rod shrinks, causing the rotating shaft to rotate in the reverse direction, and then driving the louver blades to rotate and close. At the same time, the moving piece and the pulling rope move towards each other. During the process of the pulling rope moving towards each other, the pulling force of the pulling rope on the sealing piece gradually decreases. Then, the compression spring pulls the connecting column to move, causing the sealing piece to seal the ventilation slots on the frequency converter box body, thereby ensuring the fire extinguishing effect of the fire extinguisher.

[0020] 4. By opening air holes at the top of the frequency converter box body, the air pressure inside the frequency converter box is adjusted to ensure the normal release of carbon dioxide in the fire extinguisher and further ensure the fire extinguishing effect. Description of the Drawings

[0010] Figure 1 : Schematic diagram of the overall structure of the present invention;

[0011] Figure 2 : Schematic diagram of the structures of components such as the heat insulation board, control cabinet, and double-axis electric push rod of the present invention;

[0012] Figure 3 : Schematic diagram of the structures of components such as the louver blades, fixed column, and gear of the present invention;

[0013] Figure 4 : Schematic diagram of the structures of components such as the louver blades, rotating shaft, and gear of the present invention;

[0014] Figure 5 : Schematic diagram of the structures of components such as the double-axis electric push rod, connecting piece, and rotating shaft of the present invention;

[0015] Figure 6: Structural schematic diagrams of components such as the fire extinguisher, moving part, and pull rope of the present invention;

[0016] Figure 7 : Partial enlarged schematic diagram at position A of the present invention;

[0017] Figure 8 : Structural schematic diagrams of components such as the dust-proof net and sealing part of the present invention;

[0018] Figure 9 : Structural schematic diagrams of components such as the pushing part, guide rail, and wedge block of the present invention;

[0019] Figure 10 : Structural schematic diagrams of components such as the wedge block, energy storage spring, and pushing part of the present invention;

[0020] Figure 11 : Structural schematic diagrams of components such as the pull rope, rope wheel, and regulation cavity of the present invention;

[0021] In the figure: 1, frequency converter box body; 10, heat insulation board; 11, dust-proof net; 111, ventilation slot; 12, regulation cabinet; 13, temperature sensor; 14, double-axis electric push rod; 15, connecting piece; 16, fixed column; 17, gear; 18, rotating shaft; 19, louver blade; 2, fire extinguisher; 21, cam; 22, guiding piece; 222, air pipe; 23, pushing part; 24, guide rail; 25, wedge block; 26, energy storage spring; 27, torsion spring; 28, knocking part; 29, connecting shaft; 3, moving part; 31, pull rope; 32, rope wheel; 33, sealing part; 34, connecting column; 35, pressure spring; 36, air hole. Detailed implementation manners

[0022] Next, a specific embodiment of the present invention will be elaborated in detail with reference to the accompanying drawings.

[0023] A frequency converter with intelligent temperature monitoring and overheat protection includes a frequency converter box body 1 made of stainless steel and die-cast aluminum alloy. To facilitate the heat dissipation of the frequency converter box body 1, a plurality of louver blades 19 are provided below the two side walls of the frequency converter box body 1. Inside the frequency converter box body 1, there is a main control cavity for frequency conversion and a regulation cavity for regulating the temperature of the frequency converter box body 1. According to common sense, since the frequency converter box body 1 generates heat during operation, to protect the electronic components and circuits in the main control cavity and the regulation cavity from being affected, a heat insulation board 10 is provided between the main control cavity and the regulation cavity. The heat insulation board 10 is intended to prevent the heat transfer of the main control cavity. To facilitate monitoring the temperature inside the frequency converter box body 1 and dissipating heat in a timely manner, the present invention sets a temperature sensor 13 on the heat insulation board 10 to achieve automatic monitoring. The temperature sensor 13 is provided on the heat insulation board 10, and the overheat signal detected by the temperature sensor 13 will be transmitted to the regulation cavity, and the heat dissipation work of the device is achieved through the regulation cavity.

[0024] Specifically, a control cabinet 12 is provided inside the control cavity of the frequency converter box body 1, and a heat dissipation component for driving the louver blades 19 to rotate and open to achieve heat dissipation is provided inside the control cabinet 12.

[0025] Initially, all the louver blades 19 of the device are in a closed state, aiming to seal the frequency converter box body 1. When the devices in the main control cavity of the frequency converter box body 1 operate, heat will be generated. When the temperature sensor 13 detects that the temperature in the main control cavity of the frequency converter box body 1 reaches a certain value, it will trigger the start of the heat dissipation component in the control cabinet 12, so that multiple louver blades 19 rotate and open simultaneously. Among them, the heat dissipation component includes a double-shaft electric push rod 14 provided inside the control cabinet 12. Connecting pieces 15 are fixedly connected to both output shafts of the double-shaft electric push rod 14. Fixed columns 16 are fixedly connected to the connecting pieces 15. A plurality of racks are fixedly connected to the fixed columns 16. Rotating shafts 18 are fixedly connected to the louver blades 19. The rotating shafts 18 are used to drive the louver blades 19 to rotate. Gears 17 are fixedly connected to the bottoms of the rotating shafts 18. The number of gears 17 is equal to the number of racks on the adjacent fixed columns 16. The gears 17 mesh with the racks on the adjacent fixed columns 16.

[0026] The specific steps for the louver blades 19 to rotate and open are as follows: when the temperature sensor 13 monitors that the temperature reaches a certain value, it triggers the start of the double-shaft electric push rod 14. The output shafts at both ends of the double-shaft electric push rod 14 extend, driving the connecting pieces 15 on it to move away from each other. Thus, the racks on the fixed columns 16 mesh with the adjacent gears 17, further driving the rotating shafts 18 to rotate, and thus the louver blades 19 rotate and open. Thereby, the air convection inside and outside the frequency converter box body 1 is realized, and the automatic heat dissipation of the frequency converter box body 1 is achieved.

[0027] When the temperature inside the frequency converter box body 1 continues to rise, it is difficult to achieve rapid heat dissipation only by the rotation and opening of the louver blades 19. Therefore, in the present invention, ventilation slots 111 are provided on both side walls of the main control cavity of the frequency converter box body 1 to further accelerate the heat dissipation effect inside the frequency converter box body 1. A plurality of ventilation slots 111 are provided on both side walls of the main control cavity of the frequency converter box body 1. The ventilation slots 111 are located above the louver blades 19. However, considering that dust may enter the frequency converter through the ventilation slots 111, a dust-proof net 11 is provided inside the ventilation slots 111 to prevent dust from entering the frequency converter box body 1. The dust-proof nets 11 are installed in the ventilation slots 111 on the frequency converter box body 1. The dust-proof nets 11 are used to prevent dust from entering the frequency converter, protect the normal operation of the frequency converter and extend its service life.

[0028] With the use of the device, dust will adhere to the dustproof net 11, causing the dustproof net 11 to be blocked, thereby affecting the heat dissipation effect of the inverter case 1. Therefore, the dustproof net 11 needs to be cleaned. The common method of cleaning the dustproof net 11 is the dust blowing method, which aims to use an air blower (also called a dust blowing ball or a compressed air tank) to blow air at the dustproof net 11, and use the airflow to blow out the dust and residue. When this method is used, the airflow generated is too strong and will cause damage to the internal components of the inverter case 1. The present invention abandons this method and combines the actual needs of the present device. The present device uses a vibration method to clean the dustproof net 11. A cleaning component is set in the ventilation slot 111 of the inverter case 1, and the dustproof net 11 is vibrated by the vibration of the cleaning component. The dust on the inverter case 1 is removed, and the specific scheme is as follows: the ventilation slots 111 on the two side walls of the main control cavity of the inverter case 1 are provided with cleaning components, and the cleaning components include connecting shafts 29 fixedly connected to the ventilation slots 111 on the two side walls of the main control cavity of the inverter case 1, and the connecting shafts 29 are rotatably connected with knocking pieces 28, and the connecting shafts 29 all penetrate the knocking pieces 28, and the knocking pieces 28 are all built in the ventilation slots 111 in the inverter case 1, and the knocking pieces 28 are all in contact with the adjacent dustproof nets 11, and torsion springs 27 are provided on both sides of the knocking pieces 28, and each of the torsion springs 27 is wound around the adjacent connecting shafts 29 that penetrate the knocking pieces 28, and the torsion springs 27 are used to drive the knocking pieces 28 to reset.

[0029] The working principle of the cleaning assembly is that the knocking member 28 rotates around the connecting shaft 29 so that the knocking member 28 knocks the dustproof net 11 and generates a vibration effect, thereby causing the dust on the dustproof net 11 to fall off.

[0030] In order to rotate the knocking piece 28 and produce a vibration effect on the dustproof net 11, the device rotates the knocking piece 28 by arranging a rotating component on the rotating shaft 18. The rotating component includes a cam 21 fixedly connected to the top of the rotating shaft 18. The cam 21 rotates with the rotating shaft 18. The upper surface of the cam 21 is fixedly connected to a guide piece 22. The guide piece 22 is fixedly connected to a pushing piece 23. A guide rail 24 is provided between the bottom of the pushing piece 23 and the inverter case 1. The guide rail 24 guides the movement of the pushing piece 23. The top of the pushing piece 23 is connected to a wedge block 25 through a force storage spring 26. Each of the wedge blocks 25 is squeezed and fitted with an adjacent knocking piece 28.

[0031] In the initial state, the wedge block 25 and the striking member 28 are only in contact without extrusion. The striking member 28 is attached to the dust-proof net 11, and the torsion spring 27 is in a relaxed state. When the double-shaft electric push rod 14 is started, the rack on the fixed column 16 meshes with the gear 17, driving the rotating shaft 18 to rotate, and the louver blades 19 rotate to open. At the same time, the rotation of the rotating shaft 18 drives the cam 21 to rotate, which in turn drives the guiding member 22, the pushing member 23, and the wedge block 25 to all move backward. The wedge block 25 and the striking member 28 produce extrusion. The wedge block 25 moves backward with the pushing member 23. During this process, the striking member 28 rotates around the connecting shaft 29 due to the extrusion of the wedge block 25. Thus, the striking member 28 cancels the attachment to the dust-proof net 11, and the torsion spring 27 deforms. Subsequently, the striking member 28 passes over the wedge block 25, and then the striking member 28 rotates and resets in the direction of attaching to the dust-proof net 11 under the action of the torsion spring 27. By the rotation and reset of the striking member 28, the vibration effect of the striking member 28 on the dust-proof net 11 is realized, and thus the dust on the dust-proof net 11 falls off.

[0032] Specifically, in order to prevent external impacts from vibrating the frequency converter box body 1 and ensure the stability of the frequency converter box body 1, shock pads are provided at the bottom of the frequency converter box body 1.

[0033] In summary, only by the temperature sensor 13 triggering and starting the double-shaft electric push rod 14, the rotation and opening action of the louver blades 19 and the vibration action of the striking member 28 on the dust-proof net 11 are synchronized. At the same time, the heat dissipation inside the frequency converter box body 1 and the cleaning effect on the dust-proof net 11 are realized, improving the heat dissipation efficiency and working efficiency of the device.

[0034] When the temperature of the internal components in the main control cavity of the frequency converter box 1 rises, it may lead to device ignition. To promptly control the fire in the frequency converter box 1 and avoid explosion, power-off and fire extinguishing treatments need to be carried out on the frequency converter box 1. The solutions are as follows. First, an alarm is installed on the outer wall of the frequency converter box 1. The alarm is electrically connected to the temperature sensor 13. When the temperature sensor 13 detects that the temperature inside the frequency converter box 1 is too high, it will send a warning signal and trigger the alarm on the frequency converter box 1 to sound an alarm, reminding the staff to cut off the power in time. Therefore, an alarm is installed on the frequency converter box 1. Second, the warning signal sent by the temperature sensor 13 is transmitted to the control cavity, and the main control cavity is warned through the control of the control cavity. Specifically, in this device, a fire extinguisher 2 is installed inside the frequency converter box 1 to extinguish the burning devices in the main control cavity of the frequency converter box 1. The fire extinguisher 2 is installed in the control cavity of the frequency converter box 1. The fire extinguisher 2 is preferably a carbon dioxide fire extinguisher. Its working principle is to use the carbon dioxide gas stored in the high-pressure gas cylinder as the fire extinguishing agent. After spraying, it can quickly cool down and isolate oxygen, thus achieving the purpose of extinguishing the fire. Secondly, the carbon dioxide fire extinguisher has non-conductivity and can be safely used in a live state without causing secondary damage to the frequency converter box 1. Two air pipes 222 are provided on the fire extinguisher 2. The air pipes 222 penetrate through the heat insulation board 10 and extend into the main control cavity of the frequency converter box 1. It should be specially noted that no electronic devices are provided on the straight-line positions where the air pipes 222 are located in the main control cavity of the frequency converter box 1, aiming to ensure that the gas sprayed by the air pipes 222 will not damage the electronic devices. The warning signal of the temperature sensor 13 can trigger the opening of the fire extinguisher 2. The fire extinguishing agent (mainly carbon dioxide) in the fire extinguisher 2 is released into the main control cavity of the frequency converter box 1 through the air pipes 222 to extinguish the fire.

[0035] Since the specific location of the burning device in the main control cavity cannot be determined, and the fire needs to be controlled within an effective time, this device fills the entire main control cavity with the fire extinguishing agent to achieve effective and comprehensive fire extinguishing. Since the fire extinguishing agent sprayed by the fire extinguisher 2 is mainly carbon dioxide, and its molecular mass is lighter than that of air. If the shutter blades 19 and the ventilation slots 111 on the frequency converter box 1 are both in the open state, the continuous entry of air into the main control cavity of the frequency converter box 1 will cause the carbon dioxide sprayed by the fire extinguisher 2 to not fill the entire main control cavity, thus affecting the fire extinguishing effect. Therefore, when the fire extinguisher 2 releases carbon dioxide, the shutter blades 19 and the ventilation slots 111 on the frequency converter box 1 should be closed.

[0036] According to the above description, when the temperature sensor 13 sends out a warning signal, the shutter 19 should change from the rotation open state to the closed state, and the temperature sensor 13 triggers the output shaft of the dual-axis electric push rod 14 to contract, and the rack and gear 17 on the fixed column 16 engage again, driving the rotating shaft 18 to rotate in the opposite direction, and then driving the shutter 19 to rotate in the opposite direction and close, and return to the initial state, thereby achieving the closing of the shutter 19 and ensuring the fire extinguishing effect of the fire extinguisher 2.

[0037] At the same time, the output shafts at both ends of the dual-axis electric push rod 14 shrink synchronously, and the rotating shaft 18 rotates in the opposite direction, driving the cam 21 to rotate in the opposite direction, thereby driving the guide member 22, the pushing member 23 and the wedge block 25 to move forward, and the wedge block 25 and the knocking member 28 are squeezed again. The wedge block 25 slides downward in the pushing member 23 and moves forward at the same time, and the force storage spring 26 is deformed. During this process, the knocking member 28 will rotate in the opposite direction around the connecting shaft 29 due to the squeezing of the wedge block 25. When the wedge block 25 and the knocking member 28 gradually break away from the squeezing, the wedge block 25 resets upward under the action of the force storage spring 26, and the knocking member 28 rotates and resets in the direction of fitting the dustproof net 11 under the action of the torsion spring 27. At this time, the cam 21, the pushing member 23, the wedge block 25 and the knocking member 28 all return to their initial state.

[0038] After the shutter 19 is closed, the ventilation slot 111 on the inverter housing 1 is still in an open state. Therefore, the present invention achieves the sealing effect of the ventilation slot 111 by setting a sealing component on the inverter housing 1. Figure 4 - Figure 5, the sealing assembly includes two sealing members 33 slidably connected to the inner sides of the two side walls of the main control cavity of the frequency converter box body 1. A plurality of sliding plates are provided on the sealing member 33, and the sliding plates are located inside the ventilation slots 111. The sealing member 33 can completely seal the ventilation slots 111 on the frequency converter box body 1. A plurality of sliding grooves are formed on the two side walls of the main control cavity of the frequency converter box body 1, and the number of sliding grooves and the number of sliding plates on the sealing member 33 are equal. The sliding plates of the sealing member 33 are all slidably connected to the adjacent sliding grooves of the frequency converter box body 1. A connecting column 34 is fixedly connected between two adjacent sliding grooves of the frequency converter box body 1, and the sliding plates on the sealing member 33 are also slidably connected to the adjacent connecting column 34. The sealing member 33 can also slide on the connecting column 34. A pressure spring 35 is provided between the sliding plate of the sealing member 33 and the adjacent sliding groove of the frequency converter box body 1. The pressure springs 35 are all wound around the adjacent connecting column 34. The pressure spring 35 can drive the sealing member 33 to move. A pull rope 31 is connected to the front side of each sealing member 33. The pull rope 31 has a fixed length. One end of the pull rope 31 passes through the heat insulation plate 10 through the wire groove on the two side walls of the main control cavity of the frequency converter box body 1 and is connected to the sealing member 33, and the other end of the pull rope 31 is fixedly connected with a moving member 3. The moving members 3 are all fixedly connected to one side of the connecting member 15. Two connecting rods are fixedly connected to the front side of the connecting member 15. Rope wheels 32 are provided on both connecting rods. The rope wheels 32 are used to support and guide the pull rope 31, transmit power, and reduce friction. For specific reference Figure 11 , the pull rope 31 passes through the middle of the rope wheels 32 on the two connecting rods and bypasses the front rope wheel 32 and is connected to the sealing member 33. The rope wheels 32 are used to reduce the friction of the pull rope 31.

[0039] The working principle of the sealing assembly of the present invention is as follows. Initially, the double-shaft electric push rod 14 is not started, the pressure spring 35 is in a stretched state, and the pull rope 31 is in a straightened state. At this time, the acting force of the pull rope 31 on the sealing member 33 is greater than the acting force of the pressure spring 35 on the sealing member 33. Therefore, the sealing member 33 is misaligned with the ventilation slots 111 on the frequency converter box body 1 to produce a ventilation effect. When the warning signal of the temperature sensor 13 triggers the output shaft of the double-shaft electric push rod 14 to contract, it drives the connecting member 15 and the moving member 3 to move towards each other, and then pulls the pull rope 31 to move towards each other. Since the pull rope 31 has a fixed length, during the process of the pull rope 31 moving towards each other, the pulling force of the pull rope 31 on the sealing member 33 gradually decreases. Then, the pressure spring 35 pulls the connecting column 34 to move in the direction of the pressure spring 35 resetting, so that the sealing member 33 seals the ventilation slots 111 on the frequency converter box body 1, further ensuring the fire extinguishing effect of the fire extinguisher 2. It should be noted that the displacement of the output shaft of the double-shaft electric push rod 14 when it contracts is constant, aiming to ensure that the displacement of the connecting member 15 and the pull rope 31 driven by it can just make the sealing member 33 seal the ventilation slots 111.

[0040] Considering that the ventilation slots 111 and louver blades 19 in the main control cavity of the frequency converter box body 1 are both closed, if the frequency converter box body 1 is in a completely enclosed state, excessive air pressure will cause the carbon dioxide in the fire extinguisher 2 to be unable to be released normally. Therefore, this device solves this problem by opening air holes 36 at the top of the frequency converter box body 1. The top of the frequency converter box body 1 is provided with evenly distributed air holes 36. When the temperature sensor 13 sends out a warning signal, it triggers the fire extinguisher 2 to release carbon dioxide. During the process that the carbon dioxide fills the entire main control cavity from bottom to top, the air originally remaining in the main control cavity will be discharged through the air holes 36 at the top of the frequency converter box body 1, enabling the carbon dioxide to be released smoothly. After the fire extinguishing is completed, the carbon dioxide in the main control cavity can also be discharged from the air holes 36.

[0041] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An inverter with intelligent temperature monitoring and overheat protection, comprising an inverter housing (1), characterized in that: The inverter case (1) is provided with a louver (19), the inverter case (1) is provided with a main control chamber and a control chamber, a heat insulation board (10) is provided between the main control chamber and the control chamber of the inverter case (1), a temperature sensor (13) is provided on the heat insulation board (10), a control cabinet (12) is provided in the control chamber of the inverter case (1), a heat dissipation component for heat dissipation is provided in the control cabinet (12), the heat dissipation component comprises a double-axis electric push rod (14), the control cabinet (12) is provided with a double-axis electric push rod (14), a connecting piece (15) is provided on the double-axis electric push rod (14), a fixing column (16) is provided on the fixing column (16), a rack is provided on the fixing column (16), a rotating shaft (18) is provided on the rotating shaft (18), and a gear (17) is provided on the gear (17).

2. The frequency converter with intelligent temperature monitoring and overheat protection according to claim 1, characterized in that: A ventilation slot (111) is provided on the main control chamber of the frequency converter housing (1), and a dustproof net (11) is provided in the ventilation slot (111) of the frequency converter housing (1).

3. The frequency converter with intelligent temperature monitoring and overheat protection according to claim 1, characterized in that: A cleaning component is provided on the ventilation slot (111) of the main control chamber of the inverter housing (1), and the cleaning component comprises a connecting shaft (29) fixedly connected to the ventilation slot (111) of the main control chamber of the inverter housing (1), and a knocking member (28) is provided on the connecting shaft (29). The knocking member (28) is built into the ventilation slot (111) in the inverter housing (1) and fits the dustproof net (11).

4. The frequency converter with intelligent temperature monitoring and overheat protection according to claim 3 is characterized in that: A torsion spring (27) is provided between the knocking member (28) and the inverter housing (1), the torsion spring (27) being wound around a connecting shaft (29), a rotating assembly being provided on the rotating shaft (18), the rotating assembly comprising a cam (21) fixedly connected to the rotating shaft (18), a guide member (22) being provided on the cam (21), a pushing member (23) being provided on the guide member (22), a guide rail (24) being provided between the pushing member (23) and the inverter housing (1), a wedge block (25) being slidably connected to the pushing member (23), and a force storage spring (26) being provided between the wedge block (25) and the pushing member (23).

5. The frequency converter with intelligent temperature monitoring and overheat protection according to claim 1, characterized in that: A shock-absorbing pad is provided at the bottom of the frequency converter housing (1).

6. The frequency converter with intelligent temperature monitoring and overheat protection according to claim 1, characterized in that: An alarm is provided on the inverter case (1), a fire extinguisher (2) is provided in the control chamber of the inverter case (1), an air pipe (222) is provided on the fire extinguisher (2), and the air pipe (222) penetrates the heat insulation board (10) and extends deep into the main control chamber of the inverter case (1).

7. The frequency converter with intelligent temperature monitoring and overheat protection according to claim 1, characterized in that: The inverter case (1) is provided with a sealing component, which includes a sealing member (33) slidably connected to the inverter case (1), and a sliding groove is provided on the inner wall of the main control cavity of the inverter case (1), and the sealing member (33) is slidably connected in the sliding groove of the inverter case (1).

8. The frequency converter with intelligent temperature monitoring and overheat protection according to claim 7, characterized in that: The sliding groove of the inverter case (1) is provided with a connecting column (34), the closing member (33) is slidably connected to the adjacent connecting column (34), a pressure spring (35) is provided between the closing member (33) and the inverter case (1), the pressure spring (35) is wound around the connecting column (34), the closing member (33) is connected with a pull rope (31), the pull rope (31) penetrates the heat insulation board (10) and extends into the control cavity, the pull rope (31) is fixedly connected with a moving member (3), the moving member (3) is fixedly connected to the output shaft of the double-axis electric push rod (14), the control cavity of the inverter case (1) is provided with a connecting rod, the connecting rod is provided with a rope pulley (32), and the rope pulley (32) is wound with a pull rope (31).

9. The frequency converter with intelligent temperature monitoring and overheat protection according to claim 1, characterized in that: The frequency converter housing (1) is provided with air holes (36).

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