A frequency conversion cabinet with intelligent temperature control and early warning and its temperature control method

Abstract

The present invention relates to a frequency conversion cabinet with intelligent temperature control and warning and a temperature control method thereof, belonging to the technical field of the temperature control system of the frequency conversion cabinet. The frequency conversion cabinet includes 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 temperature data inside and outside the cabinet are collected by respectively arranging the plurality of temperature sensors in the integrated cavity, the frequency converter placement cavity, below the output end of the independent air duct and outside the cabinet body. The control center module drives the fans, 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 plurality of temperature sensors, so as to realize three-level cooling.

Description

Technical Field

[0001] The present invention belongs to the technical field of variable-frequency cabinet temperature control systems, and particularly relates to an intelligent temperature-controlled and early-warning variable-frequency cabinet and a temperature control method therefor. Background Art

[0002] A frequency converter control cabinet is a complete set of equipment integrating a frequency converter, a motor, peripheral electrical components and a control system. Its core function is to precisely control the motor speed by adjusting the power frequency and voltage. The main core components include a frequency converter, control components and some other safety protection components. Among them, the main heat source in the operation process of the variable-frequency cabinet is the frequency converter. Because when the frequency converter operates, it will generate a large amount of heat, increasing the temperature inside the cabinet. The existing variable-frequency cabinet cools the frequency converter by air cooling or liquid cooling. In the actual application process, relying solely on air cooling or liquid cooling for heat dissipation has poor efficiency and cannot dissipate heat in a targeted manner. In view of this, this solution has been developed. Summary of the Invention

[0003] In view of the deficiencies of the prior art, the technical problem to be solved by the present invention is to provide an intelligent temperature-controlled and early-warning variable-frequency cabinet and a temperature control method therefor, which can perform hierarchical cooling according to the temperature difference inside and outside the cabinet.

[0004] To solve the above technical problem, the technical solution adopted by the present invention is: an intelligent temperature-controlled and early-warning variable-frequency cabinet, including 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 cabinet body has an integrated cavity and a frequency converter placement cavity, and the integrated cavity and the frequency converter placement cavity are arranged at intervals left and right;

[0005] The air duct integrated box is located inside the cabinet body and is arranged above the frequency converter 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 separated from each other, the first air cavity communicates with the integrated cavity through a first electrically driven switchable door below, and the first air cavity and the second air cavity communicate with each other through a second electrically driven switchable door;

[0006] The bottom of the second air cavity communicates with the inner cavity of the independent air duct. The independent air duct surrounds the periphery of the frequency converter main body, and the output end of the independent air duct extends out of the lower end of the frequency converter placement cavity. The liquid cooling component is arranged inside the independent air duct;

[0007] The fans are arranged above the air duct integrated box, and the two fans respectively send air into the first air cavity and the second air cavity;

[0008] A plurality of the temperature sensors are respectively arranged inside the integrated cavity, inside the frequency converter placement cavity, below the output end of the independent air duct and outside the cabinet body;

[0009] 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.

[0010] Further, the independent air duct includes a frame body, the frame body is arranged around the inverter body, an annular constriction plate is arranged at the opening on the outer side of the frame body, and the annular constriction plate fits around the inverter body and is sealed.

[0011] Further, the independent air duct further includes an upper conical connecting pipe and a lower protruding pipe. One end of the upper conical connecting pipe is communicated with the second air cavity, the other end of the upper conical connecting pipe is communicated with the inner cavity of the frame body, the lower protruding pipe is arranged on the lower side of the frame body and is communicated with the inner cavity of the frame body, and the lower protruding pipe passes through the lower surface of the inverter placement cavity.

[0012] Further, the first electric drive 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 outlet holes 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 hole, an electric drive magnetic plate is arranged in the first limiting step, a plurality of the first flip plates are hinged below the air outlet hole, a groove is formed on the surface of the first flip plate facing the electric drive magnetic plate, a magnetic attraction plate is arranged in the groove, and the electric drive magnetic plate controls the closing and opening of the first flip plate by being powered on or powered off.

[0013] Further, the second electric drive switch door has the same structure as the first electric drive switch door. The first air cavity and the second air cavity are separated by a partition plate, a second notch is formed on the partition plate, and the first mounting plate body of the second electric drive switch door is installed in the second notch.

[0014] Further, the opening and closing angle of the first flip plate is between 30° and 45°.

[0015] Further, the number of the liquid cooling components is two groups and they are respectively located on both sides of the inverter main body. The liquid cooling component includes a liquid inlet pipe, a liquid outlet pipe, and a liquid passing sheet. The liquid inlet pipe and the liquid outlet pipe are arranged at intervals up and down. The liquid passing sheet is arranged between the liquid inlet pipe and the liquid outlet pipe. A liquid passing channel is arranged in the liquid passing sheet, and both ends of the liquid passing channel are respectively communicated with the inner cavities of the liquid inlet pipe and the liquid outlet pipe.

[0016] A temperature control method for a frequency conversion cabinet with intelligent temperature control and early warning. The multiple temperature sensors are respectively arranged in the integrated cavity, the inverter placement cavity, below the output end of the independent air duct, and outside the cabinet, and are respectively the first temperature sensor, the second temperature sensor, the third temperature sensor, and the fourth temperature sensor. The method includes the following steps:

[0017] S1. When the temperature difference among the first temperature sensor, the second temperature sensor, the third temperature sensor, and the fourth temperature sensor is within 5°C - 10°C, start the first-level cooling. Both fans operate simultaneously, the first electric drive type door opens, and the second electric drive type door closes.

[0018] S2. When the temperature value of the second temperature sensor is 10 - 20°C higher than that of the fourth temperature sensor, start the second-level cooling. The first electric drive type door closes, the second electric drive type door opens, and both fans dissipate heat from the frequency converter placement cavity simultaneously.

[0019] S3. When the temperature value of the second temperature sensor is 20°C or higher than that of the fourth temperature sensor, start the third-level cooling. The first electric drive type door closes, the second electric drive type door opens, both fans dissipate heat from the frequency converter placement cavity simultaneously, and the liquid cooling component starts for liquid cooling circulation.

[0020] Further, when the temperature value of the first temperature sensor is 10°C higher than that of the fourth temperature sensor, immediately cut off the power supply of the frequency conversion cabinet and give an alarm.

[0021] Further, when in the second-level cooling, if the temperature values of the second temperature sensor and the third sensor drop less than 5°C within 1 minute, immediately start the third-level cooling. When the third-level cooling starts, if the temperature values of the second temperature sensor and the third sensor drop less than 5°C within 1 minute, immediately cut off the power supply of the frequency conversion cabinet.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The present invention relates to a frequency conversion cabinet with intelligent temperature control and early warning and its temperature control method. The frequency conversion cabinet includes a cabinet body, an air duct integrated box, two fans, an independent air duct, a liquid cooling component, multiple temperature sensors, and a control center module. By respectively arranging multiple temperature sensors in the integrated cavity, the frequency converter placement cavity, below the output end of the independent air duct, and outside the cabinet body, the temperature data inside and outside the cabinet is collected. The control center module drives the fans, the first electric drive type door, the second electric drive type door, and the liquid cooling component to operate according to the data submitted by the multiple temperature sensors, realizing three-level cooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a front view structural schematic diagram of the cabinet body in the present invention after hiding the cabinet door;

[0025] Figure 2 It is a three-dimensional structural schematic diagram of the independent air duct and the air duct integrated box in the present invention;

[0026] Figure 3 It is a three-dimensional structural schematic diagram of the independent air duct and the air duct integrated box in another direction in the present invention;

[0027] Figure 4 A schematic cross-sectional structure diagram of the independent air duct and the air duct integrated box in the present invention;

[0028] Figure 5 A schematic cross-sectional structure diagram of the position of the first electric drive type switch door in the present invention;

[0029] Figure 6 A schematic cross-sectional structure diagram of the independent air duct and the air duct integrated box during the primary cooling process of the present invention;

[0030] Figure 7 A schematic cross-sectional structure diagram of the independent air duct and the air duct integrated box during the secondary cooling process of the present invention;

[0031] Figure 8 A schematic cross-sectional structure diagram of the liquid cooling component in the present invention.

[0032] Markings in the figure: 1, cabinet body; 11, integrated cavity; 12, frequency converter placement cavity; 2, air duct integrated box; 21, first air cavity; 22, second air cavity; 23, partition board; 24, first electric drive type switch door; 241, first mounting plate body; 2411, electric drive type magnetic plate; 242, first flip plate; 2421, magnetic attraction plate; 25, second electric drive type switch door; 3, fan; 4, independent air duct; 41, upper conical connecting pipe; 42, lower extending pipe; 43, frame body; 44, annular constriction plate; 5, liquid cooling component; 51, liquid inlet pipe; 52, liquid outlet pipe; 53, liquid passing sheet; 6, temperature sensor. Detailed implementation manners

[0033] In order to make the above features and advantages of the present invention more obvious and understandable, specific embodiments are hereinafter given and described in detail in conjunction with the accompanying drawings.

[0034] As Figures 1-8 shown, this embodiment provides a frequency conversion cabinet with intelligent temperature control and early warning, including a cabinet body 1, an air duct integrated box 2, two fans 3, an independent air duct 4, a liquid cooling component 5, a plurality of temperature sensors 6 and a control center module.

[0035] The cabinet body 1 has an integrated cavity 11 and a frequency converter placement cavity 12, the integrated cavity 11 and the frequency converter placement cavity 12 are arranged at intervals left and right, the air duct integrated box 2 is located in the cabinet body 1 and is arranged above the frequency converter placement cavity 12 and the integrated cavity 11; the air duct integrated box 2 has a first air cavity 21 and a second air cavity 22, the first air cavity 21 and the second air cavity 22 are separated from each other, specifically, the first air cavity 21 and the second air cavity 22 are separated by a partition board 23.

[0036] Below the first air cavity 21, it is communicated with the integrated cavity 11 through the first electric drive switch door 24. Between the first air cavity 21 and the second air cavity 22, it is communicated through the second electric drive switch door 25. Specifically, the first electric drive switch door 24 includes a first mounting plate body 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 body 241 is installed in the first notch. A plurality of air outlet holes are formed on the first mounting plate body 241. A first limiting step is formed at the upper end of one side of the air outlet hole. An electric drive magnetic plate 2411 is arranged in the first limiting step. A plurality of first flip plates 242 are hinged below the air outlet hole. A groove is formed on the side of the first flip plate 242 facing the electric drive magnetic plate 2411. A magnetic attraction plate 2421 is arranged in the groove. The electric drive magnetic plate 2411 controls the closing and opening of the first flip plate 242 by getting or losing power. The second electric drive switch door 25 has the same structure as the first electric drive switch door 24. The first air cavity 21 and the second air cavity 22 are separated by a partition plate 23. A second notch is formed on the partition plate 23. The first mounting plate body 241 of the second electric drive switch door 25 is installed in the second notch.

[0037] In this solution, the air outlet is set according to the size of the first mounting plate body 241, and it is preferably within 8 - 16. The opening and closing angle of the first flip plate 242 is 30° - 45°. By setting a protrusion at the rotating shaft and a sector-shaped hole in the shaft hole for installing the rotating shaft, the protrusion is located in the sector-shaped hole, and the opening and closing angle is controlled through the cooperation of the protrusion and the sector-shaped hole. Within the range of 30° - 45° of this flipping angle, after being driven by the electric drive magnetic plate 2411, the first flip plate 242 can be adsorbed in time.

[0038] The bottom of the second air cavity 22 is communicated with the inner cavity of the independent air duct 4. The independent air duct 4 surrounds the periphery of the frequency converter main body. The output end of the independent air duct 4 extends out of the lower end of the frequency converter placement cavity 12. Specifically, the independent air duct 4 includes a frame body 43, an upper conical connecting pipe 41, and a lower extending pipe 42. The frame body 43 is arranged around the frequency converter body. An annular constriction plate 44 is arranged at the opening on the outer side of the frame body 43. The annular constriction plate 44 fits around the frequency converter body and is sealed. The end of the annular constriction plate 44 extends downward to form an extension plate. An annular groove is formed on the outer surface of the extension plate. A sealing ring is arranged in the annular groove. One end of the upper conical connecting pipe 41 is communicated with the second air cavity 22, and the other end of the upper conical connecting pipe 41 is communicated with the inner cavity of the frame body 43. The upper conical connecting pipe 41 is large at the top and small at the bottom. When the air enters the upper conical connecting pipe 41, it is pressurized once and blown into the frame body 43. The lower extending pipe 42 is arranged on the lower side of the frame body 43 and is communicated with the inner cavity of the frame body 43. The lower extending pipe 42 passes through the lower surface of the frequency converter placement cavity 12.

[0039] The liquid cooling component 5 is arranged inside the independent air duct 4. There are two groups of liquid cooling components 5, which are respectively located on both sides of the inverter main body. The liquid cooling component 5 includes a liquid inlet pipe 51, a liquid outlet pipe 52 and a liquid passing sheet 53. The liquid inlet pipe 51 and the liquid outlet pipe 52 are arranged at an upper and lower interval. The liquid passing sheet 53 is arranged between the liquid inlet pipe 51 and the liquid outlet pipe 52. The liquid passing sheet 53 has a liquid passing channel inside. The two ends of the liquid passing channel are respectively communicated with the inner cavities of the liquid inlet pipe 51 and the liquid outlet pipe 52. The liquid inlet pipe 51 and the liquid outlet pipe 52 penetrate out from the back of the cabinet 1 and are used to connect the liquid inlet equipment. According to the size of the inverter body, a refrigerator can be arranged between the liquid inlet equipment.

[0040] The fan 3 is arranged above the air duct integration box 2, and the two fans 3 respectively send air into the first air cavity 21 and the second air cavity 22. A plurality of temperature sensors 6 are respectively arranged in the integration cavity 11, 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 plurality of temperature sensors 6.

[0041] This solution also provides a temperature control method for an intelligent temperature control and warning frequency conversion cabinet, including the following steps:

[0042] In this solution, the perfect operating temperature of the inverter body is within the range of 25 degrees Celsius plus or minus 5 degrees Celsius, and it is best to be stable at 25 degrees Celsius for the best operating temperature;

[0043] 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, start the first-level cooling. The two fans 3 operate simultaneously, 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 arrow direction represents the wind direction. The fourth temperature sensor 6 is set outside the cabinet body 1. The temperature of the space where the cabinet body 1 is placed is controlled by an air conditioner, and the temperature range is 20 - 25 degrees Celsius. When the frequency conversion cabinet is working normally, due to the operation of the frequency converter body itself, the temperature of the frequency converter placement cavity 12 rises, and the temperatures of the second temperature sensor 6 and the third temperature sensor 6 increase. When the temperatures sensed by the second temperature sensor 6 and the third temperature sensor 6 are 5 degrees Celsius higher than the temperature sensed by the fourth sensor, the first electric drive type switch door 24 opens, and the second electric drive type switch door 25 closes. The two fans 3 operate simultaneously. The wind of one fan 3 blows into the integration chamber 11, and then blows out from the bottom of the integration chamber 11, keeping the temperature of the integration chamber 11 at about 25 degrees Celsius. The wind of the other fan 3 blows into the independent air duct 4, and the wind passes around the frequency converter body and takes the heat out from 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 frequency converter placement cavity 12 is effectively dissipating heat. When the temperature of the second temperature sensor 6 drops first and the third temperature sensor 6 lags behind for a while and then the temperature value also drops, it indicates that effective heat dissipation is taking place.

[0044] 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, start secondary cooling. The first electric drive type switch door 24 closes, and the second electric drive type switch door 25 opens. The two fans 3 simultaneously dissipate heat from the frequency converter placement cavity 12. The specific steps are as follows: As Figure 7 shown, the arrow direction represents the wind direction. During the high-intensity operation of the frequency converter body, the temperature will rise within a short period. When the detected value of the second temperature sensor 6 is 10°C higher than the detected value of the fourth temperature sensor 6, the first electric drive type switch door 24 closes, and the second electric drive type switch door 25 opens. The wind of one fan 3 blows into the first air cavity 21, enters the second air cavity 22 from the first air cavity 21, and then enters the independent air duct 4 together with the wind of the other fan 3. Compared with the primary cooling, by jointly dissipating heat from the frequency converter placement cavity 12 by the two fans 3, the frequency converter body can be quickly cooled down in a short time.

[0045] S3. When the temperature value of the second temperature sensor 6 is 20°C or more higher than that of the fourth temperature sensor 6, start the third-stage cooling. The first electric drive door 24 closes, and the second electric drive door 25 opens. The two fans 3 simultaneously dissipate heat from the frequency converter placement cavity 12, and the liquid cooling component 5 starts the liquid cooling cycle. The specific steps are as follows: After the second-stage cooling, if the temperature of the frequency converter placement cavity 12 continues to rise and the temperature value of the second temperature sensor 6 is 20°C higher than that of the fourth temperature sensor 6, the liquid inlet pipe 51 starts to inlet liquid. The liquid is sprayed from the liquid inlet pipe 51 into the liquid passing sheet 53, quickly absorbs heat, and then is discharged from the liquid outlet pipe 52 to perform the third-stage cooling by means of liquid cooling. During the third-stage cooling, 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 frequency conversion cabinet immediately performs power-off protection (applicable to the situation of short-term rapid temperature rise that cannot be controlled).

[0046] When the temperature value of the first temperature sensor 6 is 10°C or more higher than that of the fourth temperature sensor 6, immediately perform power-off processing on the frequency conversion cabinet and give an alarm. The first temperature sensor 6 is located in the integrated cavity 11 room. The components in the integrated cavity 11 room 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 indicates that the components in the integrated cavity 11 room may be short-circuited, or it indicates that the multi-stage cooling has not achieved limited temperature reduction for the frequency converter placement cavity 12, and power-off processing on the frequency conversion cabinet needs to be performed immediately.

[0047] When performing the second-stage cooling, if the temperature values of the second temperature sensor 6 and the third sensor drop less than 5°C within 1 minute, immediately start the third-stage cooling. When the third-stage cooling starts, if the temperature values of the second temperature sensor 6 and the third sensor drop less than 5°C within 1 minute, immediately perform power-off processing on the frequency conversion cabinet (applicable to the situation of slow temperature rise).

[0048] The double power-off protection for the frequency conversion cabinet is achieved through the above two methods.

[0049] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A variable-frequency cabinet with intelligent temperature control and early warning, characterized in that: It includes a cabinet body, an air duct integrated box, two fans, an independent air duct, a liquid cooling component, multiple temperature sensors and a control center module. An integrated cavity and an inverter placement cavity are provided inside the cabinet body, and the integrated cavity and the inverter placement cavity are arranged at intervals left and right. The air duct integrated box is located inside the cabinet body 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, and the first air cavity and the second air cavity are separated. The first air cavity communicates with the integrated cavity through a first electrically-driven switch door below, and the first air cavity and the second air cavity communicate with each other through a second electrically-driven switch door. The bottom of the second air cavity communicates with the inner cavity of the independent air duct. The independent air duct surrounds the periphery of the inverter main body, and the output end of the independent air duct extends out of the lower end of the inverter placement cavity. 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 respectively send air into the first air cavity and the second air cavity. Multiple temperature sensors are respectively arranged inside the integrated cavity, inside the inverter placement cavity, below the output end of the independent air duct and outside the cabinet body. The control center module drives the fans, the first electrically-driven switch door, the second electrically-driven switch door and the liquid cooling component to operate according to the data submitted by the multiple temperature sensors. The first electrically-driven switch door includes a first mounting plate body and multiple first flipping 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. Multiple air outlet holes 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 hole. An electrically-driven magnetic plate is arranged inside the first limiting step. The multiple first flipping plates are hinged below the air outlet hole. A groove is formed on the surface of the first flipping plate facing the electrically-driven magnetic plate. A magnetic attracting plate is arranged inside the groove. The electrically-driven magnetic plate controls the closing and opening of the first flipping plate by getting or losing power. 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 separated by a partition plate. A second notch is formed on the partition plate. The first mounting plate body of the second electrically-driven switch door is installed in the second notch.

2. The variable-frequency cabinet with intelligent temperature control and warning according to claim 1, characterized in that: The independent air duct includes a frame body, and the frame body surrounds the periphery of the inverter body. An annular constricted plate is arranged at the opening on the outer side of the frame body. The annular constricted plate fits around the periphery of the inverter body and is sealed.

3. The variable-frequency cabinet with intelligent temperature control and warning according to claim 2, characterized in that: The independent air duct further includes an upper conical connecting pipe and a lower extending pipe. One end of the upper conical connecting pipe communicates with the second air cavity, and the other end of the upper conical connecting pipe communicates with the inner cavity of the frame body. The lower extending pipe is arranged on the lower side of the frame body and communicates with the inner cavity of the frame body. The lower extending pipe passes through the lower surface of the inverter placement cavity.

4. The variable-frequency cabinet with intelligent temperature control and early warning according to claim 1, characterized in that: The opening and closing angle of the first flipping plate is between 30° and 45°.

5. An intelligent temperature-controlled and early-warning frequency conversion cabinet according to claim 1, characterized in that: The number of the liquid cooling components is two groups, and they are respectively located on both sides of the inverter main body. The liquid cooling component includes a liquid inlet pipe, a liquid outlet pipe and a liquid passing sheet. The liquid inlet pipe and the liquid outlet pipe are arranged at intervals up and down. The liquid passing sheet is arranged between the liquid inlet pipe and the liquid outlet pipe. A liquid passing channel is arranged inside the liquid passing sheet, and both ends of the liquid passing channel are respectively connected with the inner cavities of the liquid inlet pipe and the liquid outlet pipe.

6. A temperature control method for a variable frequency cabinet with intelligent temperature control and early warning according to any one of claims 1-5, characterized in that: A plurality of the temperature sensors are respectively arranged in the integration cavity, the frequency converter placement cavity, below the output end of the independent air duct and outside the cabinet, and are respectively the first temperature sensor, the second temperature sensor, the third temperature sensor and the 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, start the primary cooling. Two fans operate simultaneously, the first electric drive switch door opens, and the second electric drive switch door closes; S2. When the temperature value of the second temperature sensor is 10 - 20°C higher than the temperature value of the fourth temperature sensor, start the secondary cooling. The first electric drive switch door closes, the second electric drive switch door opens, and the two fans simultaneously dissipate heat from the frequency converter placement cavity; S3. When the temperature value of the second temperature sensor is 20°C or higher than the temperature value of the fourth temperature sensor, start the tertiary cooling. The first electric drive switch door closes, the second electric drive switch door opens, the two fans simultaneously dissipate heat from the frequency converter placement cavity, and the liquid cooling component starts liquid cooling circulation.

7. The temperature control method of the frequency conversion cabinet with intelligent temperature control and early warning according to claim 6, characterized in that: When the temperature value of the first temperature sensor is higher than the temperature value of the fourth temperature sensor, immediately cut off the power supply of the frequency conversion cabinet and give an alarm.

8. The temperature control method of the frequency conversion cabinet with intelligent temperature control and early warning according to claim 6, characterized in that: During secondary cooling, if the temperature values of the second temperature sensor and the third sensor drop less than 5°C within 1 minute, immediately start tertiary cooling. When tertiary cooling starts, if the temperature values of the second temperature sensor and the third sensor drop less than 5°C within 1 minute, immediately cut off the power supply of the frequency conversion cabinet.

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