Distribution box

Abstract

The utility model relates to a distribution box, which relates to the field of electrical equipment and comprises a temperature detection device, a temperature lower limit device, a lower limit control device and a fan device. The temperature lower limit device is connected with the temperature detection device to receive a temperature detection signal and output a comparison signal, and the lower limit control device is connected with the temperature lower limit device to receive the comparison signal and output a control signal. And the fan device is connected with the lower limit control device so as to receive the control signal and respond to the control signal so as to control starting and stopping of the fan. The power distribution box has the effects of improving the use stability of the power distribution box and reducing the condition that lines in the power distribution box are burnt out.

Description

Technical Field

[0001] The utility model relates to the field of electrical equipment, in particular to a distribution box. Background Art

[0002] A distribution box refers to an enclosed or semi-enclosed metal cabinet used for managing and distributing electric energy.

[0003] In the prior art, switchgear, measuring instruments, protective electrical appliances and auxiliary equipment are generally assembled in the distribution box according to the electrical wiring requirements, thus constituting a low-voltage power distribution device. The distribution box is generally set outdoors and is easily affected by the external environment.

[0004] When the external temperature is too high, it is easy to cause the temperature inside the distribution box to be too high, and then cause the wires inside the distribution box to be burned out. Summary of the Utility Model

[0005] In order to improve the stability of the distribution box during use and reduce the situation where the wires inside the distribution box are burned out, the utility model provides a distribution box.

[0006] The distribution box provided by the utility model adopts the following technical solution:

[0007] A distribution box includes a temperature detection device, a temperature lower limit device, a lower limit control device and a fan device. The temperature detection device is used to detect the temperature physical quantity and convert it into a temperature detection signal. The temperature lower limit device is connected to the temperature detection device to receive the temperature detection signal and output a comparison signal. The lower limit control device is connected to the temperature lower limit device to receive the comparison signal and output a control signal. The fan device is connected to the lower limit control device to receive the control signal and respond to the control signal to control the opening and closing of the fan;

[0008] When the temperature is higher than the temperature lower limit set by the temperature lower limit device, the temperature lower limit device outputs a high-level comparison signal. The lower limit control device receives the high-level comparison signal and outputs a high-level control signal. The fan device receives the high-level control signal and controls the fan to start;

[0009] When the temperature is not higher than the temperature lower limit set by the temperature lower limit device, the temperature lower limit device outputs a low-level comparison signal. The lower limit control device receives the low-level comparison signal and outputs a low-level control signal. The fan device receives the low-level control signal and controls the fan to close.

[0010] By adopting the above technical solution, when the actual temperature is higher than the set temperature lower limit value, the air circulation inside and outside the distribution box is accelerated by the fan, so as to accelerate the heat dissipation speed of the distribution box, and further reduce the situation where the wires inside the distribution box are burned out due to too high temperature, and improve the stability of the distribution box during use.

[0011] Optionally, the lower temperature device includes a lower limit setting module and a comparison module. The lower limit setting module is used to provide a lower temperature signal. The comparison module is connected to the lower limit setting module and the temperature detection device to receive the lower temperature signal and the temperature detection signal and output a comparison signal;

[0012] When the temperature detection signal is higher than the lower temperature signal, the lower temperature device outputs a comparison signal with a high level;

[0013] When the temperature detection signal is not higher than the lower temperature signal, the lower temperature device outputs a comparison signal with a low level.

[0014] By adopting the above technical solution, the lower limit value of the temperature is set by the lower limit setting module, so that different lower limit values of the temperature can be selected according to the actual situation, and the comparison module compares the actual temperature value with the lower limit value of the temperature to control the starting time of the fan.

[0015] Optionally, it further includes an upper temperature device, an upper limit control device and a speed increasing device. The upper temperature device is connected to the temperature detection device to receive the temperature detection signal and output a comparison signal. The upper limit control device is connected to the upper temperature device to receive the comparison signal and output a response signal. The speed increasing device is connected to the upper limit control device to receive the response signal and respond to the response signal to control the rotation speed of the fan;

[0016] When the temperature is higher than the upper temperature set by the upper temperature device, the upper temperature device outputs a comparison signal with a high level. The upper limit control device receives the comparison signal with a high level and outputs a response signal with a high level. The speed increasing device receives the control signal with a high level and increases the rotation speed of the fan;

[0017] When the temperature is not higher than the upper temperature set by the upper temperature device, the upper temperature device outputs a comparison signal with a low level. The upper limit control device receives the comparison signal with a low level and outputs a response signal with a low level. The speed increasing device receives the control signal with a low level and reduces the rotation speed of the fan.

[0018] By adopting the above technical solution, when the actual temperature is higher than the set upper temperature value, it means that the temperature in the distribution box is too high at this time. The speed increasing device speeds up the rotation speed of the fan to further accelerate the heat dissipation speed of the distribution box, thereby improving the stability of the use of the distribution box.

[0019] Optionally, the upper temperature device includes an upper limit setting module and a comparison module. The upper limit setting module is used to provide an upper temperature signal. The comparison module is connected to the upper limit setting module and the temperature detection device to receive the upper temperature signal and the temperature detection signal and output a comparison signal;

[0020] When the temperature detection signal is higher than the upper temperature signal, the comparison module outputs a comparison signal with a high level;

[0021] When the temperature detection signal is not higher than the temperature lower limit signal, the comparison module outputs a comparison signal with a low level.

[0022] By adopting the above technical solution, the temperature upper limit value is set by the upper limit setting module, so that different temperature upper limit values can be selected according to the actual situation, and the comparison module compares the actual temperature value with the temperature upper limit value to control the starting time of the fan.

[0023] Optionally, it further includes an error handling device, which is connected to the lower limit setting module, the upper limit setting module and the comparison module to receive the temperature lower limit signal, the temperature upper limit signal and the comparison signal and output a logic signal to the upper limit control device;

[0024] When and only when the temperature detection signal is higher than the temperature upper limit signal and the temperature upper limit signal is higher than the temperature lower limit signal, the error handling device outputs a logic signal with a high level;

[0025] Otherwise, the error handling device outputs a logic signal with a low level.

[0026] By adopting the above technical solution, the error handling device verifies the magnitude relationship between the temperature lower limit value and the temperature upper limit value, so that the speed increasing device is started when the temperature upper limit value is greater than the temperature lower limit value and the actual temperature is higher than the temperature upper limit value.

[0027] Optionally, the error handling device includes a difference module and a logic module. The difference module is connected to the lower limit setting module and the upper limit setting module to receive the temperature lower limit signal and the temperature upper limit signal and output a difference signal. The logic module is connected to the difference module and the comparison module and outputs a logic signal;

[0028] When the temperature upper limit signal is higher than the temperature lower limit signal, the difference module outputs a difference signal with a high level;

[0029] When the temperature upper limit signal is not higher than the temperature lower limit signal, the difference module outputs a difference signal with a low level;

[0030] When and only when the difference module outputs a difference signal with a high level and the comparison module outputs a comparison signal with a high level, the logic module outputs a logic signal with a high level;

[0031] Otherwise, the logic module outputs a logic signal with a low level.

[0032] By adopting the above technical solution, the difference module compares the magnitudes of the temperature lower limit signal and the temperature upper limit signal, so as to compare the magnitudes of the temperature lower limit value and the temperature upper limit value, and the logic module controls the magnitude of the output logic signal.

[0033] Optionally, it further includes a speed increase indicating device, which is connected to the upper limit control device to receive a response signal and controls the opening and closing of a speed increase indicator lamp in response to the response signal;

[0034] When the upper limit control device outputs a high-level response signal, the speed increase indicating device receives the high-level response signal and controls the speed increase indicator lamp to light up;

[0035] When the upper limit control device outputs a low-level response signal, the speed increase indicating device receives the low-level response signal and controls the speed increase indicator lamp to go out.

[0036] By adopting the above technical solution, the speed increase indicating device is generally arranged outside the distribution box, and the working condition of the fan is shown through the speed increase indicating device, so that the staff can understand the internal state of the distribution box at this time without opening the distribution box, improving the convenience of using the distribution box.

[0037] Optionally, it further includes a fan indicating device, which is connected to the lower limit control device to receive a control signal and controls the opening and closing of a fan indicator lamp in response to the control signal;

[0038] When the lower limit control device outputs a high-level control signal, the speed increase indicating device receives the high-level control signal and controls the fan indicator lamp to light up;

[0039] When the lower limit control device outputs a low-level control signal, the speed increase indicating device receives the low-level control signal and controls the fan indicator lamp to go out.

[0040] By adopting the above technical solution, the fan indicating device is generally arranged outside the distribution box, and the working condition of the fan is shown through the fan indicating device, so that the staff can understand the internal state of the distribution box at this time without opening the distribution box, improving the convenience of using the distribution box.

[0041] Optionally, it further includes a humidity detection device, a humidity upper limit device, a humidity control device, a humidity indicating device and an air drying device. The humidity detection device is used to detect the external humidity physical quantity and convert it into a humidity detection signal. The humidity upper limit device is connected to the humidity monitoring device to receive the humidity detection signal and output a comparison signal. The humidity control device is connected to the humidity upper limit device to receive the comparison signal and output a switch signal. The humidity indicating device is connected to the humidity control device to receive the switch signal and controls the opening and closing of a humidity indicator lamp in response to the switch signal. The air drying device is connected to the humidity control device to receive the switch signal and controls the opening and closing of an air dryer in response to the switch signal;

[0042] When the humidity is higher than the humidity upper limit set by the humidity upper limit device, the humidity upper limit device outputs a high-level comparison signal. The humidity control device receives the high-level comparison signal and outputs a high-level switch signal. The humidity indication device receives the high-level switch signal and controls the humidity indicator light to turn on. The air drying device receives the high-level switch signal and controls the air dryer to start;

[0043] When the humidity is lower than the humidity upper limit set by the humidity upper limit device, the humidity upper limit device outputs a low-level comparison signal. The humidity control device receives the low-level comparison signal and outputs a low-level switch signal. The humidity indication device receives the low-level switch signal and controls the humidity indicator light to turn off. The air drying device receives the low-level switch signal and controls the air dryer to turn off.

[0044] By adopting the above technical solution, when the actual humidity value is greater than the set humidity value, the humidity inside the distribution box is reduced by the air drying device, thereby reducing the situation of short circuits in the lines inside the distribution box caused by excessive humidity and improving the convenience of using the distribution box.

[0045] Optionally, the humidity upper limit device includes a humidity setting module and a comparison module. The humidity setting module is used to provide a reference humidity signal. The comparison module is connected to the humidity setting module and the humidity detection device to receive the reference humidity signal and the humidity detection signal and output a comparison signal;

[0046] When the humidity detection signal is higher than the reference humidity signal, the comparison module outputs a high-level comparison signal;

[0047] When the humidity detection signal is not higher than the reference humidity signal, the comparison module outputs a low-level comparison signal.

[0048] By adopting the above technical solution, the reference humidity value is set through the humidity setting module, so that the reference humidity value can be selected according to the actual situation to control the starting time of the air drying device, and the reference humidity signal and the humidity detection signal are compared by the comparison module to compare the magnitudes of the actual humidity value and the reference humidity value.

[0049] In summary, the present utility model includes at least one of the following beneficial technical effects:

[0050] 1. When the actual temperature is higher than the set temperature lower limit value, the air circulation inside and outside the distribution box is accelerated by the fan, thereby accelerating the heat dissipation speed of the distribution box, and further reducing the situation of the lines inside the distribution box being burned out due to excessive temperature, and improving the stability of using the distribution box;

[0051] 2. When the actual temperature is higher than the set temperature upper limit value, it means that the temperature inside the distribution box is too high at this time. The rotation speed of the fan is accelerated by the speed increasing device to further accelerate the heat dissipation speed of the distribution box, thereby improving the stability of using the distribution box;

[0052] 3. The error handling device checks the magnitude relationship between the lower temperature limit value and the upper temperature limit value, so as to start the speed increasing device when the upper temperature limit value is greater than the lower temperature limit value and the actual temperature is higher than the upper temperature limit value. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 is the circuit principle of a distribution box Figure 1 .

[0054] Figure 2 is the circuit principle of a distribution box Figure 2 .

[0055] The names of the parts referred to by the respective numerical labels in the above drawings are as follows: 10, temperature detection device; 11, lower temperature limit device; 111, lower limit setting module; 112, comparison module; 12, lower limit control device; 13, fan device; 14, upper temperature limit device; 141, upper limit setting module; 142, comparison module; 15, upper limit control device; 16, speed increasing device; 17, error handling device; 171, difference module; 172, logic module; 18, speed increasing indication device; 19, fan indication device; 20, humidity detection device; 21, upper humidity limit device; 211, humidity setting module; 212, comparison module; 22, humidity control device; 23, humidity indication device; 24, air drying device. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0056] The present utility model will be further described in detail below in conjunction with the drawings and embodiments.

[0057] Referring to Figure 1 , an embodiment of the present utility model discloses a distribution box, which includes a temperature detection device 10, a lower temperature limit device 11, a lower limit control device 12, a fan indication device 19 and a fan device 13. The temperature detection device 10 is used to detect the external temperature physical quantity and convert it into a temperature detection signal. The lower temperature limit device 11 is used to receive the temperature detection signal and compare the temperature detection signal with the set lower temperature limit value to output a comparison signal. The lower limit device is used to receive the comparison signal and output a control signal. The fan indication device 19 is used to control the opening and closing of the fan indicator lamp according to the control signal. The fan device 13 is used to control the opening and closing of the fan according to the control signal.

[0058] The temperature detection device 10 includes a thermistor RT and a resistor R7. The thermistor RT is a negative coefficient thermistor.

[0059] The lower temperature limit device 11 includes a lower limit setting module 111 and a comparison module 112. The lower limit setting module 111 is used to provide a lower temperature limit signal. The comparison module 112 is connected to the temperature detection device 10 and the lower limit setting module 111 to compare the magnitudes of the temperature detection signal and the lower temperature limit signal and output a comparison signal. The lower limit setting module 111 includes a variable resistor R1, a resistor R2, and a resistor R3. Generally, the variable resistor R1 is a knob-type slide rheostat to facilitate the staff to adjust the lower temperature limit value. The comparison module 112 includes a comparator N1 of model LM324.

[0060] The lower limit control device 12 includes a triode Q1 and a relay KM1. The triode Q1 is an NPN-type triode of model 9013. The fan indication device 19 includes a light-emitting diode LED1. The fan device 13 includes a normally open contact KM1-1 of the relay and a fan M.

[0061] Refer to Figure 1 , and further includes an upper temperature limit device 14, an error handling device 17, an upper limit control device 15, a speed increase indication device 18, and a speed increase device 16. The upper temperature limit device 14 is used to receive the temperature detection signal and compare the temperature detection signal with the set upper temperature limit value to output a comparison signal. The error handling device 17 is used to verify the magnitude relationship between the upper temperature limit value and the lower temperature limit value and output a logic signal according to the magnitude relationship and the magnitude of the comparison signal. The upper limit control device 15 is used to receive the logic signal and output a response signal. The speed increase indication device 18 is used to control the opening and closing of the speed increase indicator light according to the magnitude of the response signal. The speed increase device 16 is used to control the speed of the fan according to the magnitude of the response signal.

[0062] The upper temperature limit device 14 includes an upper limit setting module 141 and a comparison module 142. The upper limit setting module 141 is used to provide an upper temperature limit signal. The comparison module 142 is connected to the temperature detection device 10 and the upper limit setting module 141 to compare the magnitudes of the temperature detection signal and the upper temperature limit signal and output a comparison signal. The upper limit setting module 141 includes a variable resistor R4, a resistor R5, and a resistor R6. Generally, the variable resistor R4 is a knob-type slide rheostat to facilitate the staff to adjust the upper temperature limit value. The comparison module 142 includes a comparator N2 of model LM324.

[0063] The error handling device 17 includes a difference module 171 and a logic module 172. The difference module 171 is connected to the upper limit setting module 141 and the lower limit setting module 111 to compare the magnitudes of the upper temperature limit signal and the lower temperature limit signal and output a difference signal. The logic module 172 is connected to the difference module 171 and the comparison module 142 to receive the difference signal and the comparison signal and output a logic signal. The difference module 171 includes a comparator N3 of model LM324. The logic module 172 includes a chip U1, and the chip U1 is an integrated chip integrating an AND logic circuit.

[0064] The upper limit control device 15 includes a triode Q2 and a relay KM2. The triode Q2 is an NPN type triode with the model number 9013. The speed increase indicating device 18 includes a light-emitting diode LED2, and the LED2 can be selected as a light-emitting diode with a color different from that of the LED1 to show the difference. The speed increase device 16 includes a normally open contact KM2-1 of the relay and a resistor R8.

[0065] One end of the variable resistor R1 is connected to the power supply VCC. The other end of the variable resistor R1 is connected to one end of the resistor R2 and then to one end of the resistor R3. The other end of the resistor R2 is connected to the ground GND. The other end of the resistor R3 is connected to the negative input terminal of the comparator N1 and then to the negative input terminal of the comparator N3. One end of the thermistor RT is connected to the power supply VCC. The other end of the thermistor RT is connected to one end of the resistor R7 and then to the positive input terminal of the comparator N2 and then to the positive input terminal of the comparator N1. The other end of the resistor R7 is connected to the ground GND. One end of the variable resistor R4 is connected to the power supply VCC. The other end of the variable resistor R4 is connected to one end of the resistor R5 and then to one end of the resistor R6. The other end of the resistor R5 is connected to the ground GND. The other end of the resistor R6 is connected to the negative input terminal of the comparator N2 and then to the positive input terminal of the comparator N3. The output terminal of the comparator N1 is connected to the base of the triode Q1. The emitter of the triode Q1 is connected to the ground GND. The collector of the triode Q1 is connected to one end of the relay KM1. The other end of the relay KM1 is connected to the cathode of the LED1. The anode of the LED1 is connected to the power supply VCC. The output terminal of the comparator N2 is connected to one input terminal of the chip U1. The output terminal of the comparator N3 is connected to the other input terminal of the chip U1. The output terminal of the chip U1 is connected to the base of the triode Q2. The emitter of the triode Q2 is connected to the ground GND. The collector of the triode Q2 is connected to one end of the relay KM2. The other end of the relay KM2 is connected to the cathode of the LED2. The anode of the LED2 is connected to the power supply VCC. One end of the resistor R8 is connected to the power supply VCC and then to one end of the normally open contact KM2-1 of the relay. The other end of the resistor R8 is connected to one end of the normally open contact KM1-1 of the relay and then to the other end of the normally open contact KM2-1. The other end of the normally open contact KM1-1 of the relay is connected to one end of the motor M. The other end of the motor M is connected to the ground GND.

[0066] Refer to Figure 2, further comprising a humidity detection device 20, a humidity upper limit device 21, a humidity control device 22, a humidity indication device 23 and an air drying device 24. The humidity detection device 20 is used to detect the humidity physical quantity of the outside world and convert it into a humidity detection signal. The humidity upper limit device 21 compares the humidity detection signal with a set reference humidity value and outputs a comparison signal. The humidity control device 22 receives the comparison signal and outputs a switch signal. The humidity indication device 23 controls the opening and closing of the humidity indicator lamp according to the magnitude of the switch signal. The air drying device 24 controls the opening and closing of the air dryer according to the magnitude of the switch signal.

[0067] The humidity detection device 20 includes a humidity-sensitive resistor RS and a resistor R9. The humidity-sensitive resistor RS is a humidity-sensitive resistor with a negative humidity coefficient.

[0068] The humidity upper limit device 21 includes a humidity setting module 211 and a comparison module 212. The humidity setting module 211 is used to provide a humidity reference signal. The comparison module 212 is connected to the humidity setting module 211 and the humidity detection device 20 to receive the humidity reference signal and the humidity detection signal and output a comparison signal. The humidity setting module 211 includes a variable resistor R10, a resistor R11 and a resistor R12. Among them, the variable resistor R10 generally uses a knob-type sliding rheostat to facilitate the staff to adjust the humidity reference value. The comparison module 142 includes a comparator N4 of model LM324.

[0069] The humidity control device 22 includes a triode Q3 and a relay KM3. The triode Q3 is an NPN-type triode of model 9013. The speed increase indication device 18 includes a light-emitting diode LED3. Among them, LED3, LED2 and LED1 can select light-emitting diodes with different colors to show the difference. The air drying device 24 includes a normally open contact KM3-1 of the relay and an air dryer.

[0070] One end of the variable resistor R10 is connected to the power supply VCC. The other end of the variable resistor R10 is connected to one end of the resistor R11 and then connected to one end of the resistor R12. The other end of the resistor R11 is connected to the ground GND. The other end of the resistor R12 is connected to the negative input terminal of the comparator N4. One end of the humidity-sensitive resistor RS is connected to the power supply VCC. The other end of the humidity-sensitive resistor RS is connected to one end of the resistor R9 and then connected to the positive input terminal of the comparator N4. The other end of the resistor R9 is connected to the ground GND. The output terminal of the comparator N4 is connected to the base of the triode Q3. The emitter of the triode Q3 is connected to the ground GND. The collector of the triode Q3 is connected to one end of the relay KM3. The other end of the relay KM3 is connected to the cathode of the LED3. The anode of the LED3 is connected to the power supply VCC. The power input terminal of the air dryer is connected to the power supply VCC. The output terminal of the air dryer is connected to one end of the normally open contact KM3-1 of the relay. The other end of the normally open contact KM3-1 of the relay is connected to the ground GND.

[0071] The implementation principle of a distribution box in an embodiment of the present utility model is as follows:

[0072] When the temperature detection signal is higher than the lower temperature signal, the lower temperature device 11 outputs a comparison signal with a high level. The lower limit control device 12 receives the comparison signal with a high level and outputs a control signal with a high level. The fan indication device 19 receives the response signal with a high level and controls the fan indicator to light up. The fan device 13 receives the control signal with a high level and controls the fan to start;

[0073] When the temperature detection signal is not higher than the lower temperature signal, the lower temperature device 11 outputs a comparison signal with a low level. The lower temperature device 11 outputs a comparison signal with a low level. The lower limit control device 12 receives the comparison signal with a low level and outputs a control signal with a low level. The fan indication device 19 receives the response signal with a low level and controls the fan indicator to go out. The fan device 13 receives the control signal with a low level and controls the fan to shut down.

[0074] When the temperature detection signal is higher than the upper temperature signal, the comparison module 142 outputs a comparison signal with a high level. When the temperature detection signal is not higher than the lower temperature signal, the comparison module 142 outputs a comparison signal with a low level. When the upper temperature signal is higher than the lower temperature signal, the difference module 171 outputs a difference signal with a high level. When the upper temperature signal is not higher than the lower temperature signal, the difference module 171 outputs a difference signal with a low level;

[0075] When and only when the difference module 171 outputs a difference signal with a high level and the comparison module 142 outputs a comparison signal with a high level, the logic module 172 outputs a logic signal with a high level. The upper limit control device 15 receives the logic signal with a high level and outputs a response signal with a high level. The speed increase indication device 18 receives the response signal with a high level and controls the speed increase indicator to light up. The speed increase device 16 receives the control signal with a high level and increases the rotation speed of the fan;

[0076] Otherwise, the logic module 172 outputs a logic signal with a low level. The upper limit control device 15 receives the logic signal with a low level and outputs a response signal with a low level. The speed increase indication device 18 receives the response signal with a high level and controls the speed increase indicator to go out. The speed increase device 16 receives the control signal with a low level and decreases the rotation speed of the fan.

[0077] The above is only the preferred implementation mode of the present utility model. The protection scope of the present utility model is not limited to the above embodiments. All technical solutions within the idea of the present utility model belong to the protection scope of the present utility model. It should be noted that for those of ordinary skill in the art in this technical field, several improvements and refinements made without departing from the principle of the present utility model should also be regarded as the protection scope of the present utility model.

Claims

1. A distribution box, characterized in that: It includes a temperature detection device (10), a temperature lower limit device (11), a lower limit control device (12) and a fan device (13). The temperature detection device (10) is used to detect the temperature physical quantity and convert it into a temperature detection signal. The temperature lower limit device (11) is connected to the temperature detection device (10) to receive the temperature detection signal and output a comparison signal. The lower limit control device (12) is connected to the temperature lower limit device (11) to receive the comparison signal and output a control signal. The fan device (13) is connected to the lower limit control device (12) to receive the control signal and respond to the control signal to control the opening and closing of the fan; When the temperature is higher than the temperature lower limit set by the temperature lower limit device (11), the temperature lower limit device (11) outputs a high-level comparison signal. The lower limit control device (12) receives the high-level comparison signal and outputs a high-level control signal. The fan device (13) receives the high-level control signal and controls the fan to start; When the temperature is not higher than the temperature lower limit set by the temperature lower limit device (11), the temperature lower limit device (11) outputs a low-level comparison signal. The lower limit control device (12) receives the low-level comparison signal and outputs a low-level control signal. The fan device (13) receives the low-level control signal and controls the fan to close.

2. A distribution box according to claim 1, characterized in that: The temperature lower limit device (11) includes a lower limit setting module (111) and a comparison module (112). The lower limit setting module (111) is used to provide a temperature lower limit signal. The comparison module (112) is connected to the lower limit setting module (111) and the temperature detection device (10) to receive the temperature lower limit signal and the temperature detection signal and output a comparison signal; When the temperature detection signal is higher than the temperature lower limit signal, the temperature lower limit device (11) outputs a high-level comparison signal; When the temperature detection signal is not higher than the temperature lower limit signal, the temperature lower limit device (11) outputs a low-level comparison signal.

3. A distribution box according to claim 2, characterized in that: It further includes a temperature upper limit device (14), an upper limit control device (15) and a speed increasing device (16). The temperature upper limit device (14) is connected to the temperature detection device (10) to receive the temperature detection signal and output a comparison signal. The upper limit control device (15) is connected to the temperature upper limit device (14) to receive the comparison signal and output a response signal. The speed increasing device (16) is connected to the upper limit control device (15) to receive the response signal and respond to the response signal to control the rotation speed of the fan; When the temperature is higher than the temperature upper limit set by the temperature upper limit device (14), the temperature upper limit device (14) outputs a high-level comparison signal. The upper limit control device (15) receives the high-level comparison signal and outputs a high-level response signal. The speed increasing device (16) receives the high-level control signal and increases the rotation speed of the fan; When the temperature is not higher than the temperature upper limit set by the temperature upper limit device (14), the temperature upper limit device (14) outputs a low-level comparison signal. The upper limit control device (15) receives the low-level comparison signal and outputs a low-level response signal. The speed increasing device (16) receives the low-level control signal and reduces the rotation speed of the fan.

4. A distribution box according to claim 3, characterized in that: The temperature upper limit device (14) includes an upper limit setting module (141) and a comparison module (142). The upper limit setting module (141) is used to provide a temperature upper limit signal. The comparison module (142) is connected to the upper limit setting module (141) and the temperature detection device (10) to receive the temperature upper limit signal and the temperature detection signal and output a comparison signal. When the temperature detection signal is higher than the temperature upper limit signal, the comparison module (142) outputs a comparison signal with a high level. When the temperature detection signal is not higher than the temperature lower limit signal, the comparison module (142) outputs a comparison signal with a low level.

5. The distribution box according to claim 4, characterized in that: It further includes an error handling device (17). The error handling device (17) is connected to the lower limit setting module (111), the upper limit setting module (141) and the comparison module (142) to receive the temperature lower limit signal, the temperature upper limit signal and the comparison signal and output a logic signal to the upper limit control device (15). When and only when the temperature detection signal is higher than the temperature upper limit signal and the temperature upper limit signal is higher than the temperature lower limit signal, the error handling device (17) outputs a logic signal with a high level. Otherwise, the error handling device (17) outputs a logic signal with a low level.

6. The distribution box according to claim 5, characterized in that: The error handling device (17) includes a difference module (171) and a logic module (172). The difference module (171) is connected to the lower limit setting module (111) and the upper limit setting module (141) to receive the temperature lower limit signal and the temperature upper limit signal and output a difference signal. The logic module (172) is connected to the difference module (171) and the comparison module (142) and outputs a logic signal. When the temperature upper limit signal is higher than the temperature lower limit signal, the difference module (171) outputs a difference signal with a high level. When the temperature upper limit signal is not higher than the temperature lower limit signal, the difference module (171) outputs a difference signal with a low level. When and only when the difference module (171) outputs a difference signal with a high level and the comparison module (142) outputs a comparison signal with a high level, the logic module (172) outputs a logic signal with a high level. Otherwise, the logic module (172) outputs a logic signal with a low level.

7. A distribution box according to claim 3, characterized in that: It further includes a speed increase indicating device (18). The speed increase indicating device (18) is connected to the upper limit control device (15) to receive a response signal and controls the opening and closing of the speed increase indicator lamp in response to the response signal. When the upper limit control device (15) outputs a response signal with a high level, the speed increase indicating device (18) receives the response signal with a high level and controls the speed increase indicator lamp to light up. When the upper limit control device (15) outputs a response signal with a low level, the speed increase indicating device (18) receives the response signal with a low level and controls the speed increase indicator lamp to go out.

8. A distribution box according to claim 1, characterized in that: It further includes a fan indicating device (19). The fan indicating device (19) is connected to the lower limit control device (12) to receive a control signal and controls the opening and closing of the fan indicator lamp in response to the control signal. When the lower limit control device (12) outputs a control signal with a high level, the speed increase indicating device (18) receives the control signal with a high level and controls the fan indicator lamp to light up. When the lower limit control device (12) outputs a low-level control signal, the speed increase indicating device (18) receives the low-level control signal and controls the fan indicator light to go out.

9. A distribution box according to claim 1, characterized in that: It further includes a humidity detection device (20), a humidity upper limit device (21), a humidity control device (22), a humidity indicating device (23) and an air drying device (24). The humidity detection device (20) is used to detect the external humidity physical quantity and convert it into a humidity detection signal. The humidity upper limit device (21) is connected to the humidity monitoring device to receive the humidity detection signal and output a comparison signal. The humidity control device (22) is connected to the humidity upper limit device (21) to receive the comparison signal and output a switch signal. The humidity indicating device (23) is connected to the humidity control device (22) to receive the switch signal and controls the opening and closing of the humidity indicator light in response to the switch signal. The air drying device (24) is connected to the humidity control device (22) to receive the switch signal and controls the opening and closing of the air dryer in response to the switch signal; When the humidity is higher than the humidity upper limit set by the humidity upper limit device (21), the humidity upper limit device (21) outputs a high-level comparison signal. The humidity control device (22) receives the high-level comparison signal and outputs a high-level switch signal. The humidity indicating device (23) receives the high-level switch signal and controls the humidity indicator light to turn on. The air drying device (24) receives the high-level switch signal and controls the air dryer to start; When the humidity is lower than the humidity upper limit set by the humidity upper limit device (21), the humidity upper limit device (21) outputs a low-level comparison signal. The humidity control device (22) receives the low-level comparison signal and outputs a low-level switch signal. The humidity indicating device (23) receives the low-level switch signal and controls the humidity indicator light to turn off. The air drying device (24) receives the low-level switch signal and controls the air dryer to turn off.

10. A distribution box according to claim 9, characterized in that: The humidity upper limit device (21) includes a humidity setting module (211) and a comparison module (212). The humidity setting module (211) is used to provide a reference humidity signal. The comparison module (212) is connected to the humidity setting module (211) and the humidity detection device (20) to receive the reference humidity signal and the humidity detection signal and output a comparison signal; When the humidity detection signal is higher than the reference humidity signal, the comparison module (212) outputs a high-level comparison signal; When the humidity detection signal is not higher than the reference humidity signal, the comparison module (212) outputs a low-level comparison signal.

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