A cooling device for explosion-proof electric control box and a method of using the same

Abstract

A cooling device for an explosion-proof electric control box and a method for using the same, the cooling device comprising: a shell, a coolant tank, a coolant spray device, a controller, a spray electromagnetic switch and a plurality of temperature sensors; the coolant spray device is provided with a compressed air pipe, a liquid inlet pipe and a spray manifold, the compressed air pipe is connected to the compressed air source pipeline, the liquid inlet pipe is connected to the inside of the coolant tank, the spray manifold is provided with a plurality of spray ports, and a spray electromagnetic switch is provided on the opening of each spray port, the temperature signal input end of the controller is respectively connected to each temperature sensor, and a group of spray signal output ends of the controller are respectively connected to the spray signal input ends of each spray electromagnetic switch. This design can not only cool down different areas in the shell through the cooperation of the temperature sensor, the controller and the spray electromagnetic switch, effectively improving the heat dissipation efficiency of the electric control box, but also the cooling device will not generate discharge sparks, effectively improving the safety of the system.

Description

Technical Field

[0001] The present invention relates to a cooling device, and in particular to a cooling device for an explosion-proof electric control box and a use method thereof, and is specifically applicable to a cooling device having an explosion-proof function and a low maintenance cost. Background Art

[0002] The electric control box is the core part of electrical automation for controlling mechanical equipment. The electric control box contains various electrical components, and the various electronic components inside the electric control box will generate a lot of heat when working. If the temperature inside the electric control box is too high, it will affect the performance of the electronic components in the electric control box, and even cause the electronic components in the electric control box to overheat and burn. Therefore, the inside of the electric control box must be cooled by cooling equipment;

[0003] For special explosion-proof electric control boxes suitable for special environments, in addition to normal cooling requirements, it is also necessary to prevent the explosion of flammable mixtures inside and outside the electric control box. The cooling equipment currently used usually accelerates the air circulation speed inside and outside the electric control box through fans, and reduces the internal temperature of the electric control box through heat convection. Although this method can achieve a cooling effect to a certain extent, it still has the following defects:

[0004] 1. The rated voltage of the cooling fan is relatively high, and it is easy to generate electric sparks during operation. For explosion-proof electric control boxes used in dangerous dust or dangerous gas environments, electric sparks can easily ignite the dust or gas in the electric control box, causing damage to the electronic components in the electric control box.

[0005] 2. In order to achieve the cooling effect, air circulation needs to be maintained inside and outside the electric control box, which can easily bring dust from the outside of the electric control box into the inside of the electric control box. The dust is adsorbed on the surface of electronic components under the action of static electricity, which seriously hinders the heat dissipation of electronic components and requires regular cleaning, increasing maintenance costs. Summary of the invention

[0006] The purpose of the present invention is to overcome the shortcomings of the cooling equipment in the prior art that it is easy to generate electric sparks and has a high maintenance cost, and to provide a cooling equipment with an explosion-proof function and a low maintenance cost.

[0007] To achieve the above objectives, the technical solution of the present invention is:

[0008] A cooling device for an explosion-proof electric control box and a method for using the same, the cooling device comprising: a shell, a coolant tank, a coolant spray device, a controller, a spray electromagnetic switch and a plurality of temperature sensors; the top of the coolant tank is fixedly connected to the bottom of the shell, the coolant spray device is arranged inside the shell, a compressed air pipe, a liquid inlet pipe and a spray manifold are arranged on the coolant spray device, one end of the compressed air pipe, the liquid inlet pipe and the spray manifold are interconnected through a three-way joint, the other end of the compressed air pipe is connected to a compressed air source pipeline, the other end of the liquid inlet pipe is connected to the inside of the coolant tank, the other end of the spray manifold is provided with a plurality of spray ports, a spray electromagnetic switch is arranged on the opening of each spray port, a controller and a plurality of temperature sensors are arranged on the inner wall of the shell, a group of temperature signal input ends on the controller are respectively connected to the signal output ends of each temperature sensor, and a group of spray signal output ends of the controller are respectively connected to the spray signal input ends of each spray electromagnetic switch.

[0009] The coolant spray device also includes an air intake electromagnetic switch, which is a two-way cartridge valve that can control the opening amount. The air intake electromagnetic switch is arranged on the opening of the compressed air pipe, and the air intake signal input end of the air intake electromagnetic switch is connected to the air intake signal output end of the controller.

[0010] The coolant spray device also includes a liquid inlet electromagnetic switch, which is arranged on the opening of the liquid inlet pipe, and the liquid inlet signal input end of the liquid inlet electromagnetic switch is connected to the liquid inlet signal output end of the controller.

[0011] The other end of the spray manifold is provided with a plurality of spray ports, and the spray ports are evenly arranged on the inner wall of the shell. A spray electromagnetic switch is provided on the opening of each spray port, and each temperature sensor is respectively provided corresponding to a spray port. The spray signal output end of the controller is respectively connected to the spray signal input end of each spray electromagnetic switch.

[0012] The shell is divided into multiple areas by multiple electrical component mounting plates, each area is provided with at least one spray port, and the opening direction of each spray port is arranged parallel to the electrical component mounting plate.

[0013] The electric control box further comprises a shutter, and the shutter is arranged on a side of the shell.

[0014] A liquid level sensor is arranged in the coolant tank, a signal line of a liquid level signal output end of the liquid level sensor is connected with an alarm device signal, and the coolant tank is filled with coolant.

[0015] The cooling liquid is dichloromethane or alcohol.

[0016] A cooling device for an explosion-proof electric control box and a method for using the same, the method comprising the following steps:

[0017] Step 1: Setting thresholds. During the cooling equipment installation phase, system maintenance personnel set the first threshold and the second threshold for each area in the controller according to the operating temperature of the electronic components in different areas of the housing. The second threshold is the maximum operating temperature allowed for each electronic component in the area. The first threshold is:

[0018] First threshold = second threshold - 10°C;

[0019] Step 2: Detect the temperature. Each temperature sensor continuously detects the temperature of the corresponding area of ​​the shell and sends a real-time temperature signal to the controller. When any real-time temperature signal received by the controller reaches the first threshold, the controller sends a working signal to the air intake solenoid switch and the spray solenoid switch, and the system enters the third step of air cooling mode; when any real-time temperature signal received by the controller reaches the second threshold, the controller sends a working signal to the air intake solenoid switch, the liquid intake solenoid switch and the spray solenoid switch, and the system enters the fourth step of liquid cooling mode;

[0020] Step 3: Air cooling mode, after the controller sends a working signal to the air intake solenoid switch and the spray solenoid switch, the air intake solenoid switch and the spray solenoid switch are turned on. At this time, the compressed air provided by the external air source is sprayed to the corresponding area through the compressed air pipe and the spray manifold. When the temperature sensor detects that the temperature is lower than the first threshold value of -5°C, the controller sends a working signal to the air intake solenoid switch and the spray solenoid switch, and the air intake solenoid switch and the spray solenoid switch are turned off. At this time, the air cooling mode is completed, and the system returns to the second step of detecting temperature;

[0021] Step 4: Liquid cooling mode, after the controller sends a working signal to the air intake solenoid switch, liquid intake solenoid switch and spray solenoid switch, the air intake solenoid switch, liquid intake solenoid switch and spray solenoid switch are turned on. At this time, the compressed air provided by the external air source is sprayed to the corresponding area through the compressed air pipe and the spray manifold. The compressed air forms a high-speed airflow in the compressed air pipe. At this time, the internal pressure of the compressed air pipe is lower than the atmospheric pressure. The coolant in the coolant tank enters the compressed air pipe through the liquid intake pipe under the influence of the pressure difference and mixes with the compressed air. The mixture of compressed air and coolant is sprayed into the shell through the corresponding spray manifold. When the temperature sensor detects that the temperature is lower than the second threshold, the controller sends a working signal to the liquid intake solenoid switch, and the liquid intake solenoid switch is turned off. At this time, the liquid cooling mode is completed, and the system enters the fifth step of discharging steam;

[0022] Step 5: Exhaust steam. When the liquid inlet solenoid switch is closed, the air intake solenoid switch and the spray solenoid switch are still turned on, and compressed air continues to spray into the corresponding area in the shell. The high-speed airflow formed by the compressed air drives the steam formed by the heat of the coolant in the shell and the remaining unvolatile coolant to leave the shell through the shutters. When the steam exhaust step lasts for minutes, the controller sends a working signal to the air intake solenoid switch and the spray solenoid switch, and the air intake solenoid switch and the spray solenoid switch are turned off. At this time, the air cooling mode is completed, and the system returns to the second step of detecting temperature.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The cooling device for explosion-proof electric control box and its use method of the present invention are connected with controller signals. When the temperature detected by the temperature sensor is too high, the controller sends a signal to drive the spray electromagnetic switch on the spray port at the corresponding position in the shell to open. At this time, the compressed air on the air source side enters the shell through the compressed air pipe, and the air pressure in the compressed air pipe is reduced. The coolant in the coolant tank enters the compressed air pipe under the influence of the pressure difference, mixes with the compressed air, and is sprayed into the shell through the corresponding spray manifold to reduce the temperature. At the same time, the live equipment in the system is only the spray electromagnetic switches and the temperature sensors, and the working voltage is low, and no discharge sparks will be generated. Therefore, the design can cool down different areas in the shell through the cooperation of the temperature sensor, the controller and the spray electromagnetic switch, effectively improve the heat dissipation efficiency of the electric control box, and at the same time, the cooling equipment will not generate discharge sparks, effectively improving the safety of the system.

[0025] 2. The opening of the spray electromagnetic switch in the cooling device for explosion-proof electric control box and the use method thereof of the present invention can be adjusted according to the temperature detected by the temperature sensor. The opening size affects the compressed air speed and the coolant content, and thus affects the cooling efficiency. At the same time, a liquid inlet electromagnetic switch is provided on the opening of the liquid inlet pipe. When the temperature detected by the temperature sensor is slightly high, the controller can close the liquid inlet electromagnetic switch and cool down only by compressed air. Therefore, the design can adopt different cooling methods according to the cooling requirements, effectively improve the application scope of the cooling equipment, and reduce the operating cost at the same time.

[0026] 3. In the cooling device for explosion-proof electric control box and the use method thereof of the present invention, a liquid level sensor is arranged in the coolant tank, which can monitor the amount of coolant in the coolant tank. The coolant can be selected from dichloromethane or alcohol according to the demand. Dichloromethane is usually non-flammable, which can avoid combustion or even explosion when electric sparks are generated. Some explosion-proof electric control boxes are used in environments with a large amount of flammable and explosive dangerous dust or dangerous gases. At this time, there is no need to consider the flammability of the coolant, and alcohol as a coolant can avoid the toxicity of dichloromethane. Therefore, this design can select dichloromethane or alcohol according to the demand. Dichloromethane can effectively improve the safety of the cooling equipment, and alcohol can reduce the toxicity of the coolant. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the present invention.

[0028] Figure 2 It is the front view of the present invention.

[0029] In the figure: housing 1, coolant tank 2, coolant spray device 3, compressed air pipe 31, liquid inlet pipe 32, spray manifold 33, spray port 34, air inlet electromagnetic switch 35, liquid inlet electromagnetic switch 36, controller 4, spray electromagnetic switch 5, temperature sensor 6, shutter 7, electrical component mounting plate 8. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0031] See also Figure 1 A cooling device for an explosion-proof electric control box and a method for using the same, the cooling device comprising: a housing 1, a coolant tank 2, a coolant spray device 3, a controller 4, a spray electromagnetic switch 5 and a plurality of temperature sensors 6; the top of the coolant tank 2 is fixedly connected to the bottom of the housing 1, the coolant spray device 3 is arranged inside the housing 1, and a compressed air pipe 31, a liquid inlet pipe 32 and a spray manifold 33 are arranged on the coolant spray device 3, one end of the compressed air pipe 31, the liquid inlet pipe 32 and the spray manifold 33 are connected to each other through a three-way joint, and the compressed air pipe 3 The other end of the housing 1 is connected to the compressed air source pipeline, the other end of the liquid inlet pipe 32 is connected to the inside of the coolant tank 2, the other end of the spray manifold 33 is provided with a plurality of spray ports 34, and a spray electromagnetic switch 5 is provided on the opening of each spray port 34. A controller 4 and a plurality of temperature sensors 6 are provided on the inner wall of the housing 1, a group of temperature signal input ends on the controller 4 are respectively connected to the signal output ends of each temperature sensor 6, and a group of spray signal output ends of the controller 4 are respectively connected to the spray signal input ends of each spray electromagnetic switch 5.

[0032] The coolant spray device 3 also includes an air intake electromagnetic switch 35, which is a two-way cartridge valve that can control the opening amount. The air intake electromagnetic switch 35 is arranged on the opening of the compressed air pipe 31, and the air intake signal input end of the air intake electromagnetic switch 35 is connected to the air intake signal output end of the controller 4.

[0033] The coolant spray device 3 further includes a liquid inlet electromagnetic switch 36 , which is disposed on the opening of the liquid inlet pipe 32 , and a liquid inlet signal input end of the liquid inlet electromagnetic switch 36 is connected to a liquid inlet signal output end of the controller 4 .

[0034] The other end of the spray manifold 33 is provided with a plurality of spray ports 34, and the spray ports 34 are evenly arranged on the inner wall of the shell 1. A spray electromagnetic switch 5 is arranged on the opening of each spray port 34, and each temperature sensor 6 is respectively arranged corresponding to a spray port 34. The spray signal output end of the controller 4 is respectively connected to the spray signal input end of each spray electromagnetic switch 5.

[0035] The housing 1 is divided into a plurality of areas by a plurality of electrical component mounting plates 8 , each area is provided with at least one spray port 34 , and the opening direction of each spray port 34 is provided parallel to the electrical component mounting plate 8 .

[0036] The electric control box further comprises a shutter 7 , and the shutter 7 is arranged on a side of the housing 1 .

[0037] A liquid level sensor is arranged in the coolant tank 2, and a signal line of a liquid level signal output end of the liquid level sensor is connected with a signal of an alarm device. The coolant tank 2 is filled with coolant.

[0038] The cooling liquid is dichloromethane or alcohol.

[0039] A cooling device for an explosion-proof electric control box and a method for using the same, the method comprising the following steps:

[0040] Step 1: Setting thresholds. During the cooling equipment installation phase, the system maintenance personnel set the first threshold and the second threshold of each area in the controller 4 according to the operating temperature of the electronic components in different areas of the housing 1. The second threshold is the maximum operating temperature allowed for each electronic component in the area. The first threshold is:

[0041] First threshold = second threshold - 10°C;

[0042] Step 2: Detecting the temperature. Each temperature sensor 6 continuously detects the temperature of the corresponding area of ​​the shell 1 and sends a real-time temperature signal to the controller 4. When any real-time temperature signal received by the controller 4 reaches the first threshold, the controller 4 sends a working signal to the air intake electromagnetic switch 35 and the spray electromagnetic switch 5, and the system enters the third step of the air cooling mode; when any real-time temperature signal received by the controller 4 reaches the second threshold, the controller 4 sends a working signal to the air intake electromagnetic switch 35, the liquid inlet electromagnetic switch 36 and the spray electromagnetic switch 5, and the system enters the fourth step of the liquid cooling mode;

[0043] Step 3: Air cooling mode, after the controller 4 sends a working signal to the air intake electromagnetic switch 35 and the spray electromagnetic switch 5, the air intake electromagnetic switch 35 and the spray electromagnetic switch 5 are turned on, and the compressed air provided by the external air source is sprayed to the corresponding area through the compressed air pipe 31 and the spray manifold 33. When the temperature sensor 6 detects that the temperature is lower than the first threshold value -5°C, the controller 4 sends a working signal to the air intake electromagnetic switch 35 and the spray electromagnetic switch 5, and the air intake electromagnetic switch 35 and the spray electromagnetic switch 5 are turned off. At this time, the air cooling mode is completed, and the system returns to the second step of detecting temperature;

[0044] Step 4: Liquid cooling mode. After the controller 4 sends a working signal to the air intake electromagnetic switch 35, the liquid intake electromagnetic switch 36 and the spray electromagnetic switch 5, the air intake electromagnetic switch 35, the liquid intake electromagnetic switch 36 and the spray electromagnetic switch 5 are turned on. At this time, the compressed air provided by the external air source is sprayed to the corresponding area through the compressed air pipe 31 and the spray manifold 33. The compressed air forms a high-speed airflow in the compressed air pipe 31. At this time, the internal pressure of the compressed air pipe 31 is lower than the atmospheric pressure. The coolant in the coolant tank 2 enters the compressed air pipe 31 through the liquid intake pipe 32 under the influence of the pressure difference and mixes with the compressed air. The mixture of compressed air and coolant is sprayed into the housing 1 through the corresponding spray manifold 33. When the temperature sensor 6 detects that the temperature is lower than the second threshold, the controller 4 sends a working signal to the liquid intake electromagnetic switch 36, and the liquid intake electromagnetic switch 36 is turned off. At this time, the liquid cooling mode is completed, and the system enters the fifth step of discharging steam.

[0045] Step 5: Exhaust steam. When the liquid inlet electromagnetic switch 36 is closed, the air inlet electromagnetic switch 35 and the spray electromagnetic switch 5 are still turned on, and the compressed air continues to be sprayed into the corresponding area in the shell 1. The high-speed airflow formed by the compressed air drives the steam formed by the heat of the coolant in the shell 1 and the remaining unvolatile coolant to leave the shell 1 through the shutter 7. When the steam exhaust step lasts for 5 minutes, the controller 4 sends a working signal to the air inlet electromagnetic switch 35 and the spray electromagnetic switch 5, and the air inlet electromagnetic switch 35 and the spray electromagnetic switch 5 are turned off. At this time, the air cooling mode is completed, and the system returns to the second step of detecting the temperature.

[0046] The principle of the present invention is described as follows:

[0047] In the air cooling mode, the high-speed airflow formed by the compressed air forms forced convection of the gas in the housing 1, thereby reducing the temperature of the surface of the electrical components;

[0048] In the liquid cooling mode, this design not only reduces the temperature by forced convection, but also the volatile coolant enters the shell 1 and contacts the high-temperature air in the shell 1, thereby reducing the air temperature by volatilization.

[0049] Embodiment 1:

[0050] A cooling device for an explosion-proof electric control box and a method for using the same, the cooling device comprising: a housing 1, a coolant tank 2, a coolant spray device 3, a controller 4, a spray electromagnetic switch 5 and a plurality of temperature sensors 6; the top of the coolant tank 2 is fixedly connected to the bottom of the housing 1, the coolant spray device 3 is arranged inside the housing 1, and a compressed air pipe 31, a liquid inlet pipe 32 and a spray manifold 33 are arranged on the coolant spray device 3, one end of the compressed air pipe 31, the liquid inlet pipe 32 and the spray manifold 33 are connected to each other through a three-way joint, and the compressed air pipe The other end of the spray manifold 31 is connected to the compressed air source pipeline, the other end of the liquid inlet pipe 32 is connected to the inside of the coolant tank 2, the other end of the spray manifold 33 is provided with a plurality of spray ports 34, each of the spray ports 34 is provided with a spray electromagnetic switch 5, the inner wall of the housing 1 is provided with a controller 4 and a plurality of temperature sensors 6, a group of temperature signal input ends on the controller 4 are respectively connected to the signal output ends of each temperature sensor 6, and a group of spray signal output ends of the controller 4 are respectively connected to the spray signal input ends of each spray electromagnetic switch 5. The cooling liquid spray device 3 further comprises an air intake electromagnetic switch 35, which is a two-way cartridge valve capable of controlling the opening amount. The air intake electromagnetic switch 35 is disposed on the opening of the compressed air pipe 31, and the air intake signal input end of the air intake electromagnetic switch 35 is connected to the air intake signal output end of the controller 4; the cooling liquid spray device 3 further comprises a liquid intake electromagnetic switch 36, which is disposed on the opening of the liquid intake pipe 32, and the liquid intake signal input end of the liquid intake electromagnetic switch 36 is connected to the liquid intake signal output end of the controller 4. The other end of the spray manifold 33 is provided with a plurality of spray ports 34, and the spray ports 34 are evenly arranged on the inner wall of the shell 1. A spray electromagnetic switch 5 is arranged on the opening of each spray port 34, and each temperature sensor 6 is respectively arranged corresponding to a spray port 34. The spray signal output end of the controller 4 is respectively connected to the spray signal input end of each spray electromagnetic switch 5; a liquid level sensor is arranged in the coolant tank 2, and the liquid level signal output end of the liquid level sensor is connected to the alarm device signal by raising the signal line, and the coolant tank 2 is filled with coolant.

[0051] A cooling device for an explosion-proof electric control box and a method for using the same, the method comprising the following steps:

[0052] Step 1: Setting thresholds. During the cooling equipment installation phase, the system maintenance personnel set the first threshold and the second threshold of each area in the controller 4 according to the operating temperature of the electronic components in different areas of the housing 1. The second threshold is the maximum operating temperature allowed for each electronic component in the area. The first threshold is:

[0053] First threshold = second threshold - 10°C;

[0054] Step 2: Detecting the temperature. Each temperature sensor 6 continuously detects the temperature of the corresponding area of ​​the shell 1 and sends a real-time temperature signal to the controller 4. When any real-time temperature signal received by the controller 4 reaches the first threshold, the controller 4 sends a working signal to the air intake electromagnetic switch 35 and the spray electromagnetic switch 5, and the system enters the third step of the air cooling mode; when any real-time temperature signal received by the controller 4 reaches the second threshold, the controller 4 sends a working signal to the air intake electromagnetic switch 35, the liquid inlet electromagnetic switch 36 and the spray electromagnetic switch 5, and the system enters the fourth step of the liquid cooling mode;

[0055] Step 3: Air cooling mode, after the controller 4 sends a working signal to the air intake electromagnetic switch 35 and the spray electromagnetic switch 5, the air intake electromagnetic switch 35 and the spray electromagnetic switch 5 are turned on, and the compressed air provided by the external air source is sprayed to the corresponding area through the compressed air pipe 31 and the spray manifold 33. When the temperature sensor 6 detects that the temperature is lower than the first threshold value -5°C, the controller 4 sends a working signal to the air intake electromagnetic switch 35 and the spray electromagnetic switch 5, and the air intake electromagnetic switch 35 and the spray electromagnetic switch 5 are turned off. At this time, the air cooling mode is completed, and the system returns to the second step of detecting temperature;

[0056] Step 4: Liquid cooling mode. After the controller 4 sends a working signal to the air intake electromagnetic switch 35, the liquid intake electromagnetic switch 36 and the spray electromagnetic switch 5, the air intake electromagnetic switch 35, the liquid intake electromagnetic switch 36 and the spray electromagnetic switch 5 are turned on. At this time, the compressed air provided by the external air source is sprayed to the corresponding area through the compressed air pipe 31 and the spray manifold 33. The compressed air forms a high-speed airflow in the compressed air pipe 31. At this time, the internal pressure of the compressed air pipe 31 is lower than the atmospheric pressure. The coolant in the coolant tank 2 enters the compressed air pipe 31 through the liquid intake pipe 32 under the influence of the pressure difference and mixes with the compressed air. The mixture of compressed air and coolant is sprayed into the housing 1 through the corresponding spray manifold 33. When the temperature sensor 6 detects that the temperature is lower than the second threshold, the controller 4 sends a working signal to the liquid intake electromagnetic switch 36, and the liquid intake electromagnetic switch 36 is turned off. At this time, the liquid cooling mode is completed, and the system enters the fifth step of discharging steam.

[0057] Step 5: Exhaust steam. When the liquid inlet electromagnetic switch 36 is closed, the air inlet electromagnetic switch 35 and the spray electromagnetic switch 5 are still turned on, and the compressed air continues to be sprayed into the corresponding area in the shell 1. The high-speed airflow formed by the compressed air drives the steam formed by the heat of the coolant in the shell 1 and the remaining unvolatile coolant to leave the shell 1 through the shutter 7. When the steam exhaust step lasts for 5 minutes, the controller 4 sends a working signal to the air inlet electromagnetic switch 35 and the spray electromagnetic switch 5, and the air inlet electromagnetic switch 35 and the spray electromagnetic switch 5 are turned off. At this time, the air cooling mode is completed, and the system returns to the second step of detecting the temperature.

[0058] Embodiment 2:

[0059] Embodiment 2 is substantially the same as Embodiment 1, except that:

[0060] The shell 1 is divided into multiple areas by multiple electrical component mounting plates 8, each area is provided with at least one spray port 34, and the opening direction of each spray port 34 is arranged parallel to the electrical component mounting plate 8; the electric control box also includes a shutter 7, and the shutter 7 is arranged on the side of the shell 1.

[0061] Embodiment 3:

[0062] Embodiment 3 is substantially the same as Embodiment 2, except that:

[0063] The cooling liquid is dichloromethane or alcohol.

Claims

1. A cooling device for an explosion-proof electric control box, characterized in that: The cooling device comprises: a shell (1), a coolant tank (2), a coolant spray device (3), a controller (4), a spray electromagnetic switch (5) and a plurality of temperature sensors (6); the top of the coolant tank (2) is fixedly connected to the bottom of the shell (1), the coolant spray device (3) is arranged inside the shell (1), and the coolant spray device (3) is provided with a compressed air pipe (31), a liquid inlet pipe (32) and a spray manifold (33); one end of the compressed air pipe (31), the liquid inlet pipe (32) and the spray manifold (33) are interconnected via a three-way joint, and the other end of the compressed air pipe (31) is connected to the cooling device (3). The housing (1) is connected to a compressed air source pipeline, the other end of the liquid inlet pipe (32) is connected to the inside of the coolant tank (2), the other end of the spray manifold (33) is provided with a plurality of spray ports (34), and a spray electromagnetic switch (5) is provided on the opening of each spray port (34). A controller (4) and a plurality of temperature sensors (6) are provided on the inner wall of the housing (1), a group of temperature signal input ends on the controller (4) are respectively connected to the signal output ends of each temperature sensor (6), and a group of spray signal output ends of the controller (4) are respectively connected to the spray signal input ends of each spray electromagnetic switch (5).

2. The cooling device for explosion-proof electric control box according to claim 1, characterized in that: The coolant spray device (3) further comprises an air intake electromagnetic switch (35), wherein the air intake electromagnetic switch (35) is a two-way cartridge valve capable of controlling the opening amount, and the air intake electromagnetic switch (35) is arranged on the opening of the compressed air pipe (31), and the air intake signal input end of the air intake electromagnetic switch (35) is connected to the air intake signal output end of the controller (4).

3. The cooling device for explosion-proof electric control box according to claim 2 is characterized in that: The coolant spray device (3) further comprises a liquid inlet electromagnetic switch (36), wherein the liquid inlet electromagnetic switch (36) is arranged on the opening of the liquid inlet pipe (32), and a liquid inlet signal input end of the liquid inlet electromagnetic switch (36) is connected to a liquid inlet signal output end of the controller (4).

4. A cooling device for an explosion-proof electric control box according to any one of claims 1 to 3, characterized in that: The other end of the spray manifold (33) is provided with a plurality of spray ports (34), the spray ports (34) being evenly arranged on the inner wall of the housing (1), a spray electromagnetic switch (5) being arranged at the opening of each spray port (34), each temperature sensor (6) being arranged corresponding to a spray port (34), and a spray signal output end of the controller (4) being connected to a spray signal input end of each spray electromagnetic switch (5).

5. The cooling device for explosion-proof electric control box according to claim 4 is characterized in that: The housing (1) is divided into a plurality of areas by a plurality of electrical component mounting plates (8), each area being provided with at least one spray port (34), and the opening direction of each spray port (34) being arranged parallel to the electrical component mounting plate (8).

6. The cooling device for explosion-proof electric control box according to claim 5, characterized in that: The electric control box further comprises a shutter (7), wherein the shutter (7) is arranged on a side of the housing (1).

7. The cooling device for explosion-proof electric control box according to claim 6, characterized in that: A liquid level sensor is arranged in the coolant tank (2), a liquid level signal output end of the liquid level sensor is connected to an alarm device signal by a signal line, and the coolant tank (2) contains coolant.

8. The cooling device for explosion-proof electric control box according to claim 7 is characterized in that: The cooling liquid is dichloromethane or alcohol.

9. A method for using the cooling device for an explosion-proof electric control box according to any one of claims 1 to 8, characterized in that: The method of use comprises the following steps: The first step is to set a threshold value. During the installation phase of the cooling device, the system maintenance personnel set a first threshold value and a second threshold value for each area in the controller (4) according to the operating temperature of the electronic components in different areas of the housing (1). The second threshold value is the maximum operating temperature allowed for each electronic component in the area. The first threshold value is: First threshold = second threshold - 10°C; Step 2: Detecting the temperature, each temperature sensor (6) continuously detects the temperature of the corresponding area of ​​the shell (1) and sends a real-time temperature signal to the controller (4). When any real-time temperature signal received by the controller (4) reaches a first threshold value, the controller (4) sends a working signal to the air intake electromagnetic switch (35) and the spray electromagnetic switch (5), and the system enters the third step of air cooling mode; when any real-time temperature signal received by the controller (4) reaches a second threshold value, the controller (4) sends a working signal to the air intake electromagnetic switch (35), the liquid intake electromagnetic switch (36) and the spray electromagnetic switch (5), and the system enters the fourth step of liquid cooling mode; Step 3: Air cooling mode. After the controller (4) sends a working signal to the air intake electromagnetic switch (35) and the spray electromagnetic switch (5), the air intake electromagnetic switch (35) and the spray electromagnetic switch (5) are turned on. At this time, the compressed air provided by the external air source is sprayed to the corresponding area through the compressed air pipe (31) and the spray manifold (33). When the temperature sensor (6) detects that the temperature is lower than the first threshold value of -5°C, the controller (4) sends a working signal to the air intake electromagnetic switch (35) and the spray electromagnetic switch (5). The air intake electromagnetic switch (35) and the spray electromagnetic switch (5) are turned off. At this time, the air cooling mode is completed and the system returns to the second step of detecting the temperature. Step 4: Liquid cooling mode. After the controller (4) sends a working signal to the air inlet electromagnetic switch (35), the liquid inlet electromagnetic switch (36) and the spray electromagnetic switch (5), the air inlet electromagnetic switch (35), the liquid inlet electromagnetic switch (36) and the spray electromagnetic switch (5) are turned on. At this time, the compressed air provided by the external air source is sprayed to the corresponding area through the compressed air pipe (31) and the spray manifold (33). The compressed air forms a high-speed airflow in the compressed air pipe (31). At this time, the internal pressure of the compressed air pipe (31) is lower than the atmospheric pressure. The coolant in the coolant tank (2) enters the compressed air pipe (31) through the liquid inlet pipe (32) under the influence of the pressure difference and mixes with the compressed air. The mixture of compressed air and coolant is sprayed into the housing (1) through the corresponding spray manifold (33). When the temperature sensor (6) detects that the temperature is lower than the second threshold, the controller (4) sends a working signal to the liquid inlet electromagnetic switch (36), and the liquid inlet electromagnetic switch (36) is turned off. At this time, the liquid cooling mode is completed, and the system enters the fifth step of discharging steam. Step 5: Exhaust steam. When the liquid inlet electromagnetic switch (36) is turned off, the air inlet electromagnetic switch (35) and the spray electromagnetic switch (5) are still turned on, and compressed air continues to be sprayed into the corresponding area in the shell (1). The high-speed airflow formed by the compressed air drives the steam formed by the heat of the coolant in the shell (1) and the remaining unvolatile coolant to leave the shell (1) through the shutter (7). When the steam exhaust step lasts for 5 minutes, the controller (4) sends a working signal to the air inlet electromagnetic switch (35) and the spray electromagnetic switch (5), and the air inlet electromagnetic switch (35) and the spray electromagnetic switch (5) are turned off. At this time, the air cooling mode is completed, and the system returns to the second step of detecting the temperature.

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