Intelligent temperature control early warning frequency conversion cabinet and temperature control method thereof

Abstract

The invention relates to an intelligent temperature control early warning frequency conversion cabinet and a temperature control method thereof, and belongs to the technical field of frequency conversion cabinet temperature control systems. The frequency conversion cabinet comprises a cabinet body, an air duct integration box, two fans, an independent air duct, a liquid cooling component, a plurality of temperature sensors and a control center module; the plurality of temperature sensors are respectively arranged in the integrated cavity, in the frequency converter placing cavity, below the output end of the independent air duct and outside the cabinet body to collect temperature data inside and outside the cabinet body; the control center module drives the draught fan, the first electric drive type opening and closing door, the second electric drive type opening and closing door and the liquid cooling component to operate according to data submitted by the multiple temperature sensors, and three-stage cooling is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of frequency conversion cabinet temperature control systems, and in particular relates to a frequency conversion cabinet with intelligent temperature control and early warning and a temperature control method thereof. Background Art

[0002] The inverter control cabinet is a complete set of equipment that integrates inverters, motors, peripheral electrical components and control systems. Its core function is to achieve precise control of motor speed by adjusting the power supply frequency and voltage. The main core components are inverters, control components and some other safety protection components. The main source of heat for the inverter cabinet during operation is the inverter. Because the inverter will generate a lot of heat when it is in operation, which will increase the temperature inside the cabinet. The existing inverter control cabinet cools the inverter by air cooling or liquid cooling. In actual application, it only uses air cooling or liquid cooling for heat dissipation, which is too inefficient and cannot dissipate heat in a targeted manner. In view of this, this solution was created. Summary of the invention

[0003] In view of the deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a frequency conversion cabinet with intelligent temperature control warning and a temperature control method thereof, which can perform graded cooling according to the temperature difference between the inside and outside of the cabinet.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a frequency conversion cabinet with intelligent temperature control and early warning, comprising a cabinet body, an air duct integration box, two fans, an independent air duct, a liquid cooling component, a plurality of temperature sensors and a control center module, wherein the cabinet body has an integration cavity and a frequency converter placement cavity, and the integration cavity and the frequency converter placement cavity are arranged at intervals on the left and right; The air duct integrated box is located in the cabinet and is arranged above the inverter placement cavity and the integrated cavity; the air duct integrated box has a first air cavity and a second air cavity, the first air cavity and the second air cavity are blocked, the first air cavity is connected to the integrated cavity through a first electric drive switch door, and the first air cavity and the second air cavity are connected through a second electric drive switch door; The bottom of the second air cavity is connected to the inner cavity of the independent air duct, the independent air duct surrounds the inverter body in a circumferential manner, the output end of the independent air duct extends out of the lower end of the inverter placement cavity, and the liquid cooling component is arranged inside the independent air duct; The fans are arranged above the air duct integrated box and the two fans supply air to the first air cavity and the second air cavity respectively; The plurality of temperature sensors are respectively arranged in the integrated cavity, in the cavity where the frequency converter is placed, below the output end of the independent air duct and outside the cabinet; The control center module drives the fan, the first electric drive switch door, the second electric drive switch door and the liquid cooling component to operate according to the data submitted by the multiple temperature sensors.

[0005] Furthermore, the independent air duct includes a frame, and the frame is arranged around the inverter body. An annular shrinking plate is arranged at the opening of the frame facing outward, and the annular shrinking plate fits around the inverter body and is sealed.

[0006] Furthermore, the independent air duct also includes an upper conical connecting tube and a lower extending tube, one end of the upper conical connecting tube is connected to the second air cavity, and the other end of the upper conical connecting tube is connected to the inner cavity of the frame, the lower extending tube is arranged on the lower side of the frame and is connected to the inner cavity of the frame, and the lower extending tube passes through the lower surface of the inverter placement cavity.

[0007] Furthermore, the first electrically driven switch door includes a first mounting plate body and a plurality of first flip plates, a first notch is formed at the lower end of the first air cavity, the first mounting plate body is installed in the first notch, a plurality of air outlets are formed on the first mounting plate body, a first limiting step is formed at the upper end of one side of the air outlet, an electrically driven magnetic plate is arranged in the first limiting step, a plurality of the first flip plates are hingedly arranged below the air outlet, a groove is formed on a side of the first flip plate facing the electrically driven magnetic plate, a magnetic attraction plate is arranged in the groove, and the electrically driven magnetic plate controls the closing and opening of the first flip plate by gaining or losing power.

[0008] Furthermore, the second electrically driven switch door has the same structure as the first electrically driven switch door, the first air cavity and the second air cavity are blocked by a blocking plate, a second notch is formed on the blocking plate, and the first mounting plate of the second electrically driven switch door is installed in the second notch.

[0009] Furthermore, the opening and closing angle of the first flip plate is between 30° and 45°.

[0010] Furthermore, there are two groups of liquid cooling components, which are respectively located on both sides of the inverter body. The liquid cooling components include a liquid inlet pipe, a liquid outlet pipe and a liquid flow plate. The liquid inlet pipe and the liquid outlet pipe are arranged at intervals up and down. The liquid flow plate is arranged between the liquid inlet pipe and the liquid outlet pipe. A liquid flow channel is provided in the liquid flow plate, and both ends of the liquid flow channel are respectively connected to the inner cavity of the liquid inlet pipe and the liquid outlet pipe.

[0011] A temperature control method for a frequency conversion cabinet with intelligent temperature control warning, wherein a plurality of temperature sensors are respectively arranged in an integrated cavity, in a frequency converter placement cavity, below an output end of an independent air duct, and outside the cabinet, and are respectively a first temperature sensor, a second temperature sensor, a third temperature sensor, and a fourth temperature sensor, comprising the following steps: S1. When the temperature difference between the first temperature sensor, the second temperature sensor, the third temperature sensor and the fourth temperature sensor is within 5°C-10°C, the first stage cooling is started, the two fans operate at the same time, the first electric drive switch door is opened, and the second electric drive switch door is closed; S2. When the temperature value of the second temperature sensor is 10-20°C higher than the temperature value of the fourth temperature sensor, the secondary cooling is started, the first electric drive switch door is closed, the second electric drive switch door is opened, and the two fans simultaneously dissipate heat from the inverter placement cavity; S3. When the temperature value of the second temperature sensor is 20°C or more higher than the temperature value of the fourth temperature sensor, the third-level cooling is started, the first electric-driven switch door is closed, the second electric-driven switch door is opened, the two fans simultaneously dissipate heat from the inverter placement cavity, and the liquid cooling component is started for liquid cooling circulation.

[0012] Furthermore, when the temperature value of the first temperature sensor is 10° C. higher than the temperature value of the fourth temperature sensor, the frequency converter cabinet is immediately powered off and an alarm is issued.

[0013] Furthermore, during the second-level cooling, if the temperature values ​​of the second temperature sensor and the third sensor drop by less than 5°C within 1 minute, the third-level cooling is immediately started. When the third-level cooling is started, if the temperature values ​​of the second temperature sensor and the third sensor drop by less than 5°C within 1 minute, the frequency converter cabinet is immediately powered off.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention relates to a frequency conversion cabinet with intelligent temperature control and early warning and a temperature control method thereof. The frequency conversion cabinet comprises a cabinet body, an air duct integrated box, two fans, an independent air duct, a liquid cooling component, a plurality of temperature sensors and a control center module. The plurality of temperature sensors are respectively arranged in an integrated cavity, in a cavity where a frequency converter is placed, below an output end of the independent air duct and outside the cabinet to collect temperature data inside and outside the cabinet. The control center module drives the fan, a first electric drive switch door, a second electric drive switch door and a liquid cooling component to operate according to the data submitted by the plurality of temperature sensors to achieve three-stage cooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a front view structural diagram of the cabinet body of the present invention with the cabinet door hidden; Figure 2 It is a schematic diagram of the three-dimensional structure of the independent air duct and the air duct integrated box in the present invention; Figure 3 It is a schematic diagram of the three-dimensional structure of the independent air duct and the air duct integrated box in another direction of the present invention; Figure 4 It is a schematic cross-sectional structure diagram of the independent air duct and the air duct integrated box in the present invention; Figure 5 It is a cross-sectional structural schematic diagram of the first electric drive switch door position in the present invention; Figure 6 It is a schematic cross-sectional structural diagram of an independent air duct and an air duct integrated box in a primary cooling process of the present invention; Figure 7It is a schematic cross-sectional structural diagram of an independent air duct and an air duct integrated box in the secondary cooling process of the present invention; Figure 8 It is a schematic cross-sectional structural diagram of the liquid cooling component in the present invention.

[0016] Markings in the figure: 1. Cabinet; 11. Integrated cavity; 12. Inverter placement cavity; 2. Air duct integrated box; 21. First air cavity; 22. Second air cavity; 23. Blocking plate; 24. First electric-driven switch door; 241. First mounting plate; 2411. Electric-driven magnetic plate; 242. First flip plate; 2421. Magnetic plate; 25. Second electric-driven switch door; 3. Fan; 4. Independent air duct; 41. Upper conical connecting tube; 42. Lower extension tube; 43. Frame; 44. Annular shrink plate; 5. Liquid cooling component; 51. Liquid inlet pipe; 52. Liquid outlet pipe; 53. Liquid flow sheet; 6. Temperature sensor. DETAILED DESCRIPTION

[0017] In order to make the above features and advantages of the present invention more obvious and easy to understand, embodiments are given below with reference to the accompanying drawings for detailed description as follows.

[0018] like Figure 1-Figure 8 As shown, this embodiment provides a frequency conversion cabinet with intelligent temperature control and early warning, including a cabinet body 1, an air duct integration box 2, two fans 3, an independent air duct 4, a liquid cooling component 5, multiple temperature sensors 6 and a control center module.

[0019] The cabinet 1 has an integrated cavity 11 and an inverter placement cavity 12, which are spaced apart on the left and right. The air duct integration box 2 is located in the cabinet 1 and is arranged above the inverter placement cavity 12 and the integrated cavity 11. The air duct integration box 2 has a first air cavity 21 and a second air cavity 22, which are blocked from each other. Specifically, the first air cavity 21 and the second air cavity 22 are blocked by a blocking plate 23.

[0020] The first air cavity 21 is connected to the integrated cavity 11 through the first electrically driven switch door 24 at the bottom, and the first air cavity 21 and the second air cavity 22 are connected through the second electrically driven switch door 25. Specifically, the first electrically driven switch door 24 includes a first mounting plate 241 and a plurality of first flip plates 242. A first notch is formed at the lower end of the first air cavity 21. The first mounting plate 241 is mounted in the first notch. A plurality of air outlets are formed on the first mounting plate 241. A first limiting step is formed at the upper end of one side of the air outlet. An electrically driven magnetic plate 2411 is arranged in the first limiting step. A plurality of first flip plates 242 are hingedly arranged below the air outlet, a groove is provided on the side of the first flip plate 242 facing the electrically driven magnetic plate 2411, a magnetic attraction plate 2421 is arranged in the groove, the electrically driven magnetic plate 2411 controls the closing and opening of the first flip plate 242 by gaining or losing power, the second electrically driven switch door 25 has the same structure as the first electrically driven switch door 24, the first air cavity 21 and the second air cavity 22 are blocked by a blocking plate 23, a second notch is formed on the blocking plate 23, and the first mounting plate body 241 of the second electrically driven switch door 25 is installed in the second notch.

[0021] In this solution, the air outlet is set according to the size of the first mounting plate 241, and 8-16 is more preferred. The opening and closing angle of the first flip plate 242 is 30°-45°. A protrusion is set at the shaft, and a fan-shaped hole is set in the shaft hole of the mounting shaft. The protrusion is located in the fan-shaped hole. The opening and closing angle is controlled by the cooperation of the protrusion and the fan-shaped hole. Within the flip angle of 30°-45°, the first flip plate 242 can be adsorbed in time after being driven by the electrically driven magnetic plate 2411.

[0022] The bottom of the second air cavity 22 is connected to the inner cavity of the independent air duct 4. The independent air duct 4 surrounds the inverter body. The output end of the independent air duct 4 extends out of the lower end of the inverter placement cavity 12. Specifically, the independent air duct 4 includes a frame 43, an upper conical connecting tube 41 and a lower extending tube 42. The frame 43 is framed around the inverter body. An annular shrinking plate 44 is provided at the opening on the outward side of the frame 43. The annular shrinking plate 44 fits around the inverter body and is sealed. An extension plate is extended downward at the end of the annular shrinking plate 44. An annular groove is formed on the outward side of the extension plate, and a sealing ring is provided in the annular groove. One end of the upper conical connecting tube 41 is connected to the second air cavity 22, and the other end of the upper conical connecting tube 41 is connected to the inner cavity of the frame 43. The upper conical connecting tube 41 is larger at the top and smaller at the bottom. When wind enters the upper conical connecting tube 41, it is pressurized and blown into the frame 43. The lower extension tube 42 is arranged on the lower side of the frame 43 and is connected to the inner cavity of the frame 43. The lower extension tube 42 passes through the lower surface of the inverter placement cavity 12.

[0023] The liquid cooling component 5 is arranged on the inner side of the independent air duct 4. There are two groups of liquid cooling components 5, which are respectively located on both sides of the inverter body. The liquid cooling component 5 includes a liquid inlet pipe 51, a liquid outlet pipe 52 and a liquid passing plate 53. The liquid inlet pipe 51 and the liquid outlet pipe 52 are arranged at intervals up and down. The liquid passing plate 53 is arranged between the liquid inlet pipe 51 and the liquid outlet pipe 52. There is a liquid passing channel in the liquid passing plate 53. The two ends of the liquid passing channel are respectively connected to the inner cavity of the liquid inlet pipe 51 and the liquid outlet pipe 52. The liquid inlet pipe 51 and the liquid outlet pipe 52 are passed through the back of the cabinet 1 and are used to connect the liquid inlet device. According to the size of the inverter body, a refrigerator can be arranged between the liquid inlet devices.

[0024] The fan 3 is arranged above the air duct integrated box 2 and the two fans 3 supply air to the first air cavity 21 and the second air cavity 22 respectively. Multiple temperature sensors 6 are respectively arranged in the integrated cavity 11, in the inverter placement cavity 12, below the output end of the independent air duct 4 and outside the cabinet 1, which are the first temperature sensor 6, the second temperature sensor 6, the third temperature sensor 6 and the fourth temperature sensor 6 respectively. The control center module drives the fan 3, the first electric drive switch door 24, the second electric drive switch door 25 and the liquid cooling component 5 to operate according to the data submitted by the multiple temperature sensors 6.

[0025] This solution also provides a temperature control method for a frequency conversion cabinet with intelligent temperature control early warning, comprising the following steps: In this solution, the inverter body has a perfect operating temperature within the range of 25 degrees Celsius +- 5 degrees Celsius, and a stable operating temperature of 25 degrees Celsius is the optimal operating temperature; S1. When the temperature difference between the first temperature sensor 6, the second temperature sensor 6, the third temperature sensor 6 and the fourth temperature sensor 6 is within 5°C-10°C, the first cooling is started, the two fans 3 operate at the same time, the first electric drive switch door 24 is opened, and the second electric drive switch door 25 is closed; the specific steps are as follows: Figure 6As shown, the direction of the arrow represents the wind direction. The fourth temperature sensor 6 is arranged outside the cabinet 1. The space where the cabinet 1 is placed is temperature-controlled by air conditioning, and the temperature range is 20-25 degrees Celsius. When the frequency converter cabinet is in normal operation, due to the operation of the frequency converter body, the temperature of the frequency converter placement cavity 12 rises, and the temperature of the second temperature sensor 6 and the third temperature sensor 6 rises. When the temperature sensed by the second temperature sensor 6 and the third temperature sensor 6 is greater than the temperature sensed by the fourth sensor by 5 degrees Celsius, the first electric drive switch door 24 is opened, the second electric drive switch door 25 is closed, and the two fans are turned on. 3 are running at the same time, the wind from one fan 3 blows into the integrated chamber 11, and then blows out from the bottom of the integrated chamber 11, so that the temperature of the integrated chamber 11 is maintained at about 25 degrees Celsius, and the wind from the other fan 3 blows into the independent air duct 4, and the wind passes through the four sides of the inverter body to take the heat out of the independent air duct 4. According to the temperature change between the second temperature sensor 6 and the third temperature sensor 6, it is judged whether the inverter placement chamber 12 is effectively dissipating the heat. When the temperature of the second temperature sensor 6 drops first and the third temperature sensor 6 lags behind, the temperature value also drops accordingly, indicating that effective heat dissipation is being carried out.

[0026] S2. When the temperature value of the second temperature sensor 6 is 10°C higher than the temperature value of the fourth temperature sensor 6, the secondary cooling is started, the first electric drive switch door 24 is closed, the second electric drive switch door 25 is opened, and the two fans 3 simultaneously dissipate heat to the inverter placement cavity 12; the specific steps are as follows: Figure 7 As shown, the direction of the arrow represents the wind direction. During the high-intensity operation of the inverter body, the temperature will rise in a short time. When the detection value of the second temperature sensor 6 is 10°C higher than the detection value of the fourth temperature sensor 6, the first electric-driven switch door 24 is closed and the second electric-driven switch door 25 is opened. One of the fans 3 blows wind into the first wind cavity 21, enters the second wind cavity 22 from the first wind cavity 21, and then enters the independent air duct 4 together with the wind from the other fan 3. Compared with the first-level cooling, the inverter placement cavity 12 is centrally cooled by two fans 3, so that the inverter body can be quickly cooled in a short time.

[0027] S3. When the temperature value of the second temperature sensor 6 is 20°C or higher than the temperature value of the fourth temperature sensor 6, the third-level cooling is started, the first electric-driven switch door 24 is closed, the second electric-driven switch door 25 is opened, and the two fans 3 simultaneously dissipate heat to the inverter placement chamber 12. The liquid cooling component 5 is started to perform a liquid cooling cycle. The specific steps are as follows: After the second-level cooling, when the temperature of the inverter placement chamber 12 continues to rise, and the temperature value of the second temperature sensor 6 is 20°C higher than the temperature value of the fourth temperature sensor 6, the liquid inlet pipe 51 starts to take in liquid, and the liquid is sprayed from the liquid inlet pipe 51 into the liquid plate 53. After quickly absorbing heat, it is discharged from the liquid outlet pipe 52, and the third-level cooling is performed by liquid cooling. During the third-level cooling process, the value of the second temperature sensor 6 continues to rise. When the value of the second temperature sensor 6 exceeds the temperature value of the fourth temperature sensor 6 by 25°C, the inverter cabinet immediately performs power-off protection (applicable to situations where the temperature rises rapidly in a short period of time and cannot be controlled).

[0028] When the temperature value of the first temperature sensor 6 is 10°C higher than the temperature value of the fourth temperature sensor 6, the frequency converter cabinet is immediately powered off and an alarm is sounded. The first temperature sensor 6 is located in the integrated cavity 11. The components in the integrated cavity 11 do not generate a large amount of heat. When the temperature of the first temperature sensor 6 is 10°C higher than the room temperature, it means that a short circuit may occur in the components in the integrated cavity 11, or that the multi-stage cooling does not achieve limited cooling for the cavity 12 where the frequency converter is placed, and the frequency converter cabinet needs to be powered off immediately.

[0029] During the second-stage cooling, if the temperature values ​​of the second temperature sensor 6 and the third sensor drop by less than 5°C within 1 minute, the third-stage cooling is started immediately. When the third-stage cooling is started, if the temperature values ​​of the second temperature sensor 6 and the third sensor drop by less than 5°C within 1 minute, the frequency converter cabinet is immediately powered off (applicable to the case of slow heating).

[0030] The above two methods can realize double power-off protection for the frequency converter cabinet.

[0031] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for illustrating the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which shall fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A frequency conversion cabinet with intelligent temperature control and early warning, characterized in that: It includes a cabinet, an air duct integration box, two fans, an independent air duct, a liquid cooling component, a plurality of temperature sensors and a control center module. The cabinet has an integration cavity and a frequency converter placement cavity, and the integration cavity and the frequency converter placement cavity are arranged at intervals on the left and right. The air duct integrated box is located in the cabinet and is arranged above the inverter placement cavity and the integrated cavity; the air duct integrated box has a first air cavity and a second air cavity, the first air cavity and the second air cavity are blocked, the first air cavity is connected to the integrated cavity through a first electric drive switch door, and the first air cavity and the second air cavity are connected through a second electric drive switch door; The bottom of the second air cavity is connected to the inner cavity of the independent air duct, the independent air duct surrounds the inverter body in a circumferential manner, the output end of the independent air duct extends out of the lower end of the inverter placement cavity, and the liquid cooling component is arranged inside the independent air duct; The fans are arranged above the air duct integrated box and the two fans supply air to the first air cavity and the second air cavity respectively; The plurality of temperature sensors are respectively arranged in the integrated cavity, in the cavity where the frequency converter is placed, below the output end of the independent air duct and outside the cabinet; The control center module drives the fan, the first electric drive switch door, the second electric drive switch door and the liquid cooling component to operate according to the data submitted by the multiple temperature sensors.

2. According to claim 1, the frequency conversion cabinet with intelligent temperature control and early warning is characterized in that: The independent air duct comprises a frame, and the frame is arranged around the inverter body. An annular shrinking plate is arranged at the opening of the frame facing outward, and the annular shrinking plate is attached to the inverter body and sealed.

3. The frequency conversion cabinet with intelligent temperature control and early warning according to claim 2 is characterized in that: The independent air duct also includes an upper conical connecting tube and a lower extending tube, one end of the upper conical connecting tube is connected to the second air cavity, and the other end of the upper conical connecting tube is connected to the inner cavity of the frame, the lower extending tube is arranged on the lower side of the frame and is connected to the inner cavity of the frame, and the lower extending tube passes through the lower surface of the inverter placement cavity.

4. The frequency conversion cabinet with intelligent temperature control and early warning according to claim 1 is characterized in that: The first electrically driven switch door includes a first mounting plate body and a plurality of first flip plates, a first notch is formed at the lower end of the first air cavity, the first mounting plate body is installed in the first notch, a plurality of air outlets are formed on the first mounting plate body, a first limiting step is formed at the upper end of one side of the air outlet, an electrically driven magnetic plate is arranged in the first limiting step, a plurality of the first flip plates are hingedly arranged below the air outlet, a groove is formed on the side of the first flip plate facing the electrically driven magnetic plate, a magnetic attraction plate is arranged in the groove, and the electrically driven magnetic plate controls the closing and opening of the first flip plate by gaining or losing power.

5. The frequency conversion cabinet with intelligent temperature control and early warning according to claim 4 is characterized in that: The second electrically driven switch door has the same structure as the first electrically driven switch door, the first air cavity and the second air cavity are blocked by a blocking plate, a second notch is formed on the blocking plate, and the first mounting plate of the second electrically driven switch door is mounted in the second notch.

6. The frequency conversion cabinet with intelligent temperature control and early warning according to claim 5 is characterized in that: The opening and closing angle of the first flip plate is 30°-45°.

7. The frequency conversion cabinet with intelligent temperature control and early warning according to claim 1 is characterized in that: There are two groups of liquid cooling components, which are respectively located on both sides of the inverter body. The liquid cooling components include a liquid inlet pipe, a liquid outlet pipe and a liquid flow plate. The liquid inlet pipe and the liquid outlet pipe are arranged at intervals up and down. The liquid flow plate is arranged between the liquid inlet pipe and the liquid outlet pipe. A liquid flow channel is provided in the liquid flow plate. Both ends of the liquid flow channel are respectively connected to the inner cavities of the liquid inlet pipe and the liquid outlet pipe.

8. A temperature control method for a frequency conversion cabinet based on an intelligent temperature control warning according to any one of claims 1 to 7, characterized in that: The plurality of temperature sensors are respectively arranged in the integrated cavity, in the inverter placement cavity, below the output end of the independent air duct and outside the cabinet, and are respectively a first temperature sensor, a second temperature sensor, a third temperature sensor and a fourth temperature sensor, including the following steps: S1. When the temperature difference between the first temperature sensor, the second temperature sensor, the third temperature sensor and the fourth temperature sensor is within 5°C-10°C, the first stage cooling is started, the two fans operate at the same time, the first electric drive switch door is opened, and the second electric drive switch door is closed; S2. When the temperature value of the second temperature sensor is 10-20°C higher than the temperature value of the fourth temperature sensor, the secondary cooling is started, the first electric drive switch door is closed, the second electric drive switch door is opened, and the two fans simultaneously dissipate heat from the inverter placement cavity; S3. When the temperature value of the second temperature sensor is 20°C or more higher than the temperature value of the fourth temperature sensor, the third-level cooling is started, the first electric-driven switch door is closed, the second electric-driven switch door is opened, the two fans simultaneously dissipate heat from the inverter placement cavity, and the liquid cooling component is started for liquid cooling circulation.

9. The temperature control method of a frequency conversion cabinet with intelligent temperature control and early warning according to claim 8 is characterized in that: When the temperature value of the first temperature sensor is higher than the temperature value of the fourth temperature sensor, the frequency converter cabinet is immediately powered off and an alarm is issued.

10. The temperature control method of a frequency conversion cabinet with intelligent temperature control and early warning according to claim 8, characterized in that: During the second-level cooling, if the temperature values ​​of the second temperature sensor and the third sensor drop by less than 5°C within 1 minute, the third-level cooling will be started immediately. When the third-level cooling is started, if the temperature values ​​of the second temperature sensor and the third sensor drop by less than 5°C within 1 minute, the frequency converter cabinet will be powered off immediately.

Images