Control system and method for controlling air circulation and temperature regulation of enclosed space

Abstract

The invention discloses a control system for controlling air circulation and temperature regulation in a closed space, the closed space is provided with an air inlet and an air outlet, the air inlet and the air outlet are both provided with two air ducts, one of the air ducts is provided with a filter, the control system is connected with a nuclide probe, and the nuclide probe is connected with a temperature sensor. The state of the air inlet and outlet valve is controlled according to the detected radioactive numerical value outside the closed space, and then the corresponding air duct is selected, so that air enters the closed space to circulate after passing through the filter; an electric heater, a refrigerator and a fan are arranged on the inlet side of the air inlet valve, the control system is connected with a temperature sensor and a differential pressure transmitter, and air circulation and automatic temperature adjustment of the closed space are achieved according to the detected temperature of the closed space and the detected pressure difference between the inside and the outside of the closed space.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of temperature and ventilation regulation control, and particularly relates to a control system and method for controlling air circulation and temperature regulation of a closed space. BACKGROUND

[0002] In some harsh peripheral environments, it is necessary to enable staff to effectively resist external interference in a closed space, improve work efficiency, and protect the health of personnel. However, in some special cases, such as on vehicles or small ships, there is no condition to equip large air circulation control systems. Therefore, it is necessary to develop a miniaturized special prevention and control device suitable for such special occasions.

[0003] The present application adopts a self-developed programmable logic controller combined with other domestic components for research and development, and develops a control system and control method of a special prevention and control device capable of realizing air filtration, air circulation, and temperature regulation, etc. according to the hardware environment characteristics of mobile equipment such as vehicles. The control box of the control system and the matching refrigerators, fans, air filters, etc. are designed to be small in size, so that they can be applied to vehicle environments. Even if the vehicle is running in a harsh environment with radioactivity, high temperature, low temperature, etc., the air in the cockpit can still be ensured to be safe through the system. The filtered air in the cabin maintains a positive pressure outside the cabin, and the temperature in the cabin is adjusted to make it suitable for personnel to work and protect the health of the staff. SUMMARY

[0004] The present application aims to solve the deficiencies of the prior art and design a control system and control method that can be applied to mobile equipment such as vehicles to perform air circulation filtration and temperature regulation on a closed space.

[0005] The present application is realized by the following technical solutions:

[0006] A control system for controlling air circulation and temperature regulation of a closed space, the closed space is provided with an air inlet and an air outlet, the air inlet is connected with two air inlet ducts, one of which is provided with a filter, the two air inlet ducts are connected with an air inlet valve, and the conduction state of the two air inlet ducts is switched through the air inlet valve; the air outlet is connected with two air outlet ducts, one of which is provided with a filter, the two air outlet ducts are connected with an air outlet valve, and the conduction state of the two air outlet ducts is switched through the air outlet valve; an electric heater, a refrigerator, and a fan are arranged on the inlet side of the air inlet valve, which can blow hot air or cold air into the closed space, thereby realizing air circulation and temperature regulation of the closed space;

[0007] The control system comprises a main control unit, the main control unit is connected with a frequency converter, and the frequency converter is used for controlling the fan; the main control unit is connected with a nuclear probe, the nuclear probe is arranged outside the closed space and is used for detecting the radioactivity value outside the closed space; the main control unit controls the state of the air inlet valve and the air outlet valve according to the detected radioactivity value outside the closed space, and then selects corresponding air inlet ducts and air outlet ducts; the main control unit is connected with a touch screen, and man-machine interaction is realized through the touch screen; the main control unit is connected with a temperature sensor and a differential pressure transmitter, the temperature sensor is arranged in the closed space and is used for detecting the temperature in the closed space, and the differential pressure transmitter has two numbers, one is arranged in the closed space and is used for detecting the pressure in the closed space, and the other is arranged outside the closed space and is used for detecting the pressure outside the closed space.

[0008] In the above technical scheme, the structure of the control system comprises: an AC 380V power input end connected to the input side of a circuit breaker QF0, the output side of the circuit breaker QF0 connected to the input side of a general contactor, the output side of the general contactor connected to the input side of a filter, the output side of the filter connected to a frequency converter, a refrigerator protector QF1, a circuit breaker QF2, a circuit breaker QF3 and a 24V switching power supply respectively; the output side of the circuit breaker QF0 is also connected to a power switch button with a lamp, the power switch button connected to the general contactor, controlling the on-off state of the general contactor, and further controlling the power-on of the whole control system; the output side of the circuit breaker QF0 is also connected to a temperature controller, the temperature controller connected to an electric heater through a fuse;

[0009] The output side of the frequency converter is connected to the fan, and the control end of the frequency converter is connected to the main control unit through a first RS485 line; the main control unit is also connected to the switching end of the frequency converter through a relay KA0, for controlling the start or stop of the frequency converter;

[0010] The output side of the refrigerator protector QF1 is connected to the input side of a refrigerator contactor, the output side of the refrigerator contactor is connected to a refrigerator, and the control side of the refrigerator contactor is connected to a relay KA1, the coil end of the relay KA1 is connected to the main control unit, the on-off state of the relay KA1 is controlled by the main control unit, the on-off state of the refrigerator contactor is further controlled, and the working state of the refrigerator is further controlled;

[0011] The output side of the circuit breaker QF2 is connected to the input side of an electric heating contactor, the output side of the electric heating contactor is connected to an electric heater, and the control side of the electric heating contactor is connected to a relay KA3, the coil end of the relay KA3 is connected to the main control unit, the on-off state of the relay KA3 is controlled by the main control unit, the on-off state of the electric heating contactor is further controlled, and the working state of the electric heater is further controlled;

[0012] The output side of the circuit breaker QF3 outputs 220V power supply, and is connected with the relay KA1, the relay KA3, the relay KA4 and the relay KA5 to supply power for them; the output side of the relay KA4 is connected with an air inlet valve, the output side of the relay KA5 is connected with an air outlet valve, and the coil ends of the relay KA4 and the relay KA5 are controlled by the main control unit, so that the states of the air inlet valve and the air outlet valve are controlled by the main control unit.

[0013] In the above technical solution, the alarm signal of the frequency converter is connected to the main control unit, and when the frequency converter fails, the alarm signal is sent to the main control unit.

[0014] In the above technical solution, the refrigerator protector QF1, the circuit breaker QF2 and the circuit breaker QF3 are respectively feedback connected to the main control unit, and when the refrigerator protector QF1, the circuit breaker QF2 and the circuit breaker QF3 fail, the alarm signal is fed back to the main control unit.

[0015] In the above technical solution, the input end of the main control unit is connected with a manual mode selection button and an automatic mode selection button, and correspondingly, the output side of the 24V switching power supply is also connected with the relay KA2 and the relay KA6, wherein the relay KA2 is connected with a manual mode indicator lamp, and the relay KA6 is connected with an automatic mode indicator lamp; the main control unit controls the lighting state of the corresponding manual mode indicator lamp and the automatic mode indicator lamp according to the state of the manual mode selection button and the automatic mode selection button.

[0016] In the above technical solution, the output side of the 24V switching power supply is also connected with the input side of the relay KA7, the output side of the relay KA7 is connected with an alarm lamp, and the coil end of the relay KA7 is controlled by the main control unit; when the main control unit detects the alarm signal, the coil of the relay KA7 is powered, and then the alarm lamp is lighted.

[0017] In the above technical solution, the control system is provided with two working modes of manual mode and automatic mode, and the selection of the two working modes is realized through the touch screen.

[0018] In the above technical solution, the working steps of the automatic mode of the control system are as follows:

[0019] S1: after the whole control system is powered on by pressing the power switch button, the main control unit detects that the user selects the automatic mode, and then starts to start the automatic control program;

[0020] S2: the main control unit controls the states of the air inlet valve and the air outlet valve, and by default, the air inlet duct and the air outlet duct without filter are conducted; at the same time, the main control unit reads the temperature target value set by the user;

[0021] S3: the main control unit measures the internal temperature of the closed space in real time through the temperature sensor;

[0022] S4: The main control unit determines whether the measured internal temperature value is within the set temperature target range. If it is within the target range, no action is taken; if it is not within the target range, the temperature adjustment function is activated.

[0023] S5: If the temperature is lower than the set temperature target range, turn on the electric heater and start the fan to heat the incoming air; if the temperature is higher than the set temperature target range, turn on the cooler and start the fan to cool the incoming air.

[0024] S6: Determine whether the measured internal temperature after intervention has reached the set target value range; if it has reached the target range, proceed to the next step of pausing adjustment; if it has not yet reached the target value, continue adjustment.

[0025] S7: If the measured internal temperature is already within the set target range, pause temperature adjustment, turn off heating or cooling functions, and stop the fan. Then return to position S4 for reassessment.

[0026] In the above technical solution, based on the detection data from the radionuclide probe, the working steps of the automatic mode of this control system are as follows:

[0027] S1: After the power switch button is pressed and the entire control system is powered on, the main control unit detects that the user has selected the automatic mode and the radionuclide probe detects that the radioactivity value has reached the alarm limit. Then, an alarm is issued and the collective protection control program is started.

[0028] S2: The main control unit first adjusts the air inlet valve and the air outlet valve, switching to the air inlet duct and the air outlet duct equipped with filters, so that the air passes through the filter before entering the closed space for circulation;

[0029] S3: The main control unit reads the pressure difference between the inside and outside of the enclosed space and the target set value of the internal working temperature;

[0030] S4: The main control unit measures the pressure difference between the inside and outside of the enclosed space and the internal temperature in real time;

[0031] S5: Determine whether the measured value of the internal and external pressure difference is within the set target value range;

[0032] S6: Adjust the fan speed according to the difference between the measured internal and external pressure difference and the set target value. Increase the speed when the difference is large and gradually decrease the speed when the difference is small. Maintain the current speed when the target range is reached and balanced.

[0033] S7: Determine whether the measured internal temperature is within the set target value range;

[0034] S8: If the temperature is lower than the set target range, the electric heater is turned on to heat the incoming air; if the temperature is higher than the set target range, the refrigeration device is turned on to cool the incoming air;

[0035] S9: Determine whether the internal temperature measured value reaches the set target value range after heating or cooling;

[0036] S10: If the internal temperature measured value is already in the set target value range, stop the cooling or heating function, and then return to S7 to re-determine.

[0037] The advantages and beneficial effects of the present application are:

[0038] The control system and method for controlling air circulation and temperature adjustment of an enclosed space provided by the present application can be adapted to the hardware environment characteristics of mobile equipment such as vehicles, and provides a miniaturized control system that can realize air filtration, air circulation, temperature adjustment and other functions. The system control box and its matching fan, refrigeration device, etc. can be flexibly arranged and laid out, and can be adapted to the vehicle space layout. The control system has two hardware combinations, which can be powered by 380V or 220V. It has manual mode, automatic mode and integrated protection mode, which can be switched according to the situation. It has a friendly human-machine interface, which provides real-time detection status and working status display, as well as related control switching buttons. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 Layout diagram for the air inlet and outlet of the enclosed space.

[0040] Figure 2 Structure diagram of the control system for controlling air circulation and temperature adjustment of an enclosed space.

[0041] Figure 3 Flowchart of the automatic mode of the control system.

[0042] Figure 4 Flowchart of the automatic mode of the control system combined with the detection data of the nuclear probe.

[0043] For those skilled in the art, other related drawings can be obtained from the above drawings without creative labor. DETAILED DESCRIPTION

[0044] In order to enable those skilled in the art to better understand the present application, the technical solutions of the present application will be further described below in conjunction with specific embodiments.

[0045] The present embodiment designs a control system and method for controlling air circulation and temperature adjustment of an enclosed space, as shown in the accompanying Figure 1The closed space is provided with an air inlet and an air outlet, the air inlet is connected with two air inlet air ducts, one of which is provided with a filter, the two air inlet air ducts are connected with an air inlet valve, and the air inlet valve is used for switching the conduction state of the two air inlet air ducts; similarly, the air outlet is connected with two air outlet air ducts, one of which is provided with a filter, the two air outlet air ducts are connected with an air outlet valve, and the air outlet valve is used for switching the conduction state of the two air outlet air ducts; an electric heater, a refrigerating device and a fan are arranged on the inlet side of the air inlet valve, and hot air or cold air can be blown into the closed space, so that air circulation and temperature regulation of the closed space are realized.

[0046] Referring to the accompanying drawings Figure 2 The specific structure of the control system is that an AC 380V power input end is connected with an input side of a circuit breaker QF0, an output side of the circuit breaker QF0 is connected with an input side of a general contactor, an output side of the general contactor is connected with an input side of a filter, and an output side of the filter is connected with a frequency converter, a refrigerating device protector QF1, circuit breakers QF2 and QF3 and a 24V switching power supply respectively. The output side of the circuit breaker QF0 is also connected with a power switch button with a lamp, the power switch button is connected with the general contactor, controls the on-off state of the general contactor, and further controls the power-on of the whole control system. The output side of the circuit breaker QF0 is also connected with a temperature controller, and the temperature controller is connected with an electric heater through a fuse.

[0047] A fan is connected with an output side of the frequency converter, a control end of the frequency converter is connected with a main control unit through a first RS485 line, and thus frequency conversion control of the fan is realized; the main control unit is also connected with a switching end of the frequency converter through a relay KA0, and is used for controlling the start or stop of the frequency converter; an alarm signal of the frequency converter is connected to the main control unit, and when the frequency converter fails, the alarm signal is sent to the main control unit.

[0048] An output side of the refrigerating device protector QF1 is connected with an input side of a refrigerating device contactor, an output side of the refrigerating device contactor is connected with the refrigerating device, and a control side of the refrigerating device contactor is connected with a relay KA1, a coil end of the relay KA1 is connected with the main control unit, the relay KA1 is controlled by the main control unit to control the on-off state of the refrigerating device contactor, and thus the working state of the refrigerating device is controlled.

[0049] An output side of the circuit breaker QF2 is connected with an input side of an electric heating contactor, an output side of the electric heating contactor is connected with the electric heater, and a control side of the electric heating contactor is connected with a relay KA3, a coil end of the relay KA3 is connected with the main control unit, the relay KA3 is controlled by the main control unit to control the on-off state of the electric heating contactor, and thus the working state of the electric heater is controlled.

[0050] The output side of the circuit breaker QF3 outputs 220V power supply, and is connected with the relay KA1, the relay KA3, the relay KA4 and the relay KA5 to supply power for them. The output side of the relay KA4 is connected with the air inlet valve, and the output side of the relay KA5 is connected with the air outlet valve. The coil ends of the relay KA4 and the relay KA5 are controlled by the main control unit, so as to control the states of the air inlet valve and the air outlet valve through the main control unit.

[0051] The refrigerator protector QF1, the circuit breaker QF2 and the circuit breaker QF3 are respectively feedback connected to the main control unit. When the refrigerator protector QF1, the circuit breaker QF2 and the circuit breaker QF3 fail, an alarm signal is fed back to the main control unit.

[0052] The output side of the 24V switching power supply outputs 24V DC power supply to supply power for the coil ends of the relays, the main control unit and the touch screen. The output side of the 24V switching power supply is also connected with the relay KA2 and the relay KA6. The relay KA2 is connected with the manual mode indicator, and the relay KA6 is connected with the automatic mode indicator. Correspondingly, the input end of the main control unit is connected with the manual mode selection button and the automatic mode selection button. The coil ends of the relay KA2 and the relay KA6 are controlled by the main control unit, so as to control the lighting states of the corresponding manual mode indicator and the automatic mode indicator according to the states of the manual mode selection button and the automatic mode selection button (the control system is provided with two working modes of manual mode and automatic mode. The selection of the two working modes is realized through the manual mode selection button and the automatic mode selection button. The two working modes will be specifically introduced later). The output side of the 24V switching power supply is also connected with the input side of the relay KA7. The output side of the relay KA7 is connected with the alarm lamp. The coil end of the relay KA7 is controlled by the main control unit. When the main control unit detects an alarm signal, the coil of the relay KA7 is electrified, so as to light the alarm lamp.

[0053] The main control unit is also connected with the relay KA8 as a dry contact. The relay KA8 is connected with the power supply end of the nuclide probe. The signal output end of the nuclide probe is connected with the main control unit through the second RS485 line to transmit the detection data of the nuclide probe to the main control unit.

[0054] The main control unit is also connected with the touch screen through the third RS485 line to realize man-machine interaction through the touch screen.

[0055] The main control unit is also connected with the temperature sensor and the differential pressure transmitter. The temperature sensor is a PT100 platinum thermocouple arranged in the closed space to detect the temperature in the closed space. The number of the differential pressure transmitter is two. One is arranged in the closed space to detect the pressure in the closed space, and the other is arranged outside the closed space to detect the pressure outside the closed space.

[0056] The control system has two working modes, manual mode and automatic mode, and the two working modes can be selected through the manual mode selection button and the automatic mode selection button, and the selection of the two working modes can also be realized through the touch screen.

[0057] The manual mode provides comprehensive open manual control function. In this working mode, the user can manually control the air volume according to the differential pressure temperature and other indicators, and start the heating or refrigeration function.

[0058] The automatic mode provides full-automatic temperature and pressure adjustment function. In this working mode, the user only needs to set the required temperature of the enclosed space and the internal and external environmental pressure difference, and the system will automatically control the air volume according to the values of the differential pressure transmitter and the temperature sensor, and start the heating or refrigeration function.

[0059] Referring to the accompanying drawings, Figure 3 the working steps of the automatic mode of the control system are as follows:

[0060] S1: After the whole control system is powered on by pressing the power switch button, the main control unit detects that the user selects the automatic mode, and then starts the automatic control program.

[0061] S2: The main control unit controls the state of the inlet valve and the outlet valve, and by default, it selects the inlet air duct and the outlet air duct without filter to be conducted; at the same time, the main control unit reads the temperature target value set by the user.

[0062] S3: The main control unit measures the internal temperature of the enclosed space in real time through the temperature sensor.

[0063] S4: The main control unit judges whether the measured internal temperature is within the set temperature target value range, if it is within the target range, there is no action, if it is not within the target range, the temperature adjustment function is started.

[0064] S5: If the temperature is lower than the set temperature target range, the electric heater is turned on, and the fan is started to heat the incoming air; if the temperature is higher than the set temperature target range, the refrigerator is started, and the fan is started to cool the incoming air.

[0065] S6: It is judged whether the intervened measured internal temperature value reaches the set target value range. If it has reached the target range, the next step of suspending adjustment is entered, if it has not reached the target value, the adjustment is continued.

[0066] S7: If the measured internal temperature value is within the set target value range, the temperature adjustment is suspended, the heating or refrigeration function is closed, and the fan is stopped, and then it returns to the S4 position to re-judge.

[0067] Referring to the accompanying drawings, Figure 4, combined with the detection data of the nuclide probe, the working steps of the automatic mode of the control system are as follows (set defense control):

[0068] S1: press the power switch button, after the whole control system is powered on, the main control unit detects that the user selects the automatic mode, and the nuclide probe detects that the radioactivity value reaches the alarm limit, then an alarm is sent and the set defense control program is started.

[0069] S2: the main control unit first adjusts the inlet valve and the outlet valve, switches to the inlet air duct and the outlet air duct installed with the filter, so that the air passes through the filter before entering the closed space circulation.

[0070] S3: the main control unit reads the internal and external pressure difference and the internal working temperature target set value in the closed space.

[0071] S4: the main control unit measures the internal and external pressure difference and the internal temperature of the closed space in real time.

[0072] S5: judge whether the measured value of the internal and external pressure difference is within the set target value range.

[0073] S6: according to the difference between the measured value of the internal and external pressure difference and the set target value, the wind power of the fan is adjusted accordingly, when the difference is large, the wind power is increased, when the difference is small, the wind power is gradually reduced, when the target range is reached and balanced, the current wind power is maintained.

[0074] S7: judge whether the measured value of the internal temperature is within the set target value range.

[0075] S8: if the temperature is lower than the set target range, turn on the electric heater to heat the incoming air, if the temperature is higher than the set target range, turn on the refrigerator to cool the incoming air.

[0076] S9: judge whether the measured value of the internal temperature after heating or cooling reaches the set target value range.

[0077] S10: if the measured value of the internal temperature is within the set target value range, stop the cooling or heating function, and then return to S7 to rejudge.

[0078] The above is an exemplary description of the present application, it should be noted that without departing from the core of the present application, any simple modification, modification or other equivalent replacement which can not cost creative labor of those skilled in the art falls within the protection scope of the present application.

Claims

1. A control system for controlling air circulation and temperature regulation of an enclosed space, characterized by: The closed space is provided with an air inlet and an air outlet, the air inlet is connected with two air inlet air ducts, one of which is provided with a filter, the two air inlet air ducts are connected with an air inlet valve, the air inlet valve is used to switch the conduction state of the two air inlet air ducts; the air outlet is connected with two air outlet air ducts, one of which is provided with a filter, the two air outlet air ducts are connected with an air outlet valve, the air outlet valve is used to switch the conduction state of the two air outlet air ducts; an electric heater, a refrigerating device and a fan are arranged on the inlet side of the air inlet valve, which can blow hot air or cold air into the closed space, so as to realize air circulation and temperature regulation of the closed space; The control system comprises a main control unit, the main control unit is connected with a frequency converter, and the fan is controlled through the frequency converter; the main control unit is connected with a nuclear probe, the nuclear probe is arranged outside the closed space and is used for detecting the radioactivity value outside the closed space; the main control unit controls the states of the air inlet valve and the air outlet valve according to the detected radioactivity value outside the closed space, and then selects corresponding air inlet air ducts and air outlet air ducts; the main control unit is connected with a touch screen, and man-machine interaction is realized through the touch screen; the main control unit is connected with a temperature sensor and a differential pressure transmitter, the temperature sensor is arranged in the closed space and is used for detecting the temperature in the closed space, and the two differential pressure transmitters are arranged in and outside the closed space respectively and are used for detecting the pressures in and outside the closed space.

2. The control system for controlling the circulation and temperature conditioning of the air of an enclosed space according to claim 1, characterized in that: The structure of the control system comprises: an alternating current 380V power supply input end is connected with the input side of a circuit breaker QF0, the output side of the circuit breaker QF0 is connected with the input side of a general contactor, the output side of the general contactor is connected with the input side of a filter, the output side of the filter is connected with a frequency converter, a refrigerating device protector QF1, circuit breakers QF2 and QF3 and a 24V switching power supply respectively; the output side of the circuit breaker QF0 is also connected with a power switch button with a lamp, the power switch button is connected with the general contactor, controls the on-off state of the general contactor, and then controls the power-on of the whole control system; the output side of the circuit breaker QF0 is also connected with a temperature controller, the temperature controller is connected with an electric heater through a fuse; The output side of the frequency converter is connected with the fan, and the control end of the frequency converter is connected with the main control unit through a first RS485 line; the main control unit is also connected with the switching end of the frequency converter through a relay KA0, and is used for controlling the start or stop of the frequency converter; The output side of the refrigerating device protector QF1 is connected with the input side of a refrigerating device contactor, the output side of the refrigerating device contactor is connected with the refrigerating device, and the control side of the refrigerating device contactor is connected with a relay KA1, the coil end of the relay KA1 is connected with the main control unit, the relay KA1 is controlled by the main control unit to control the on-off state of the refrigerating device contactor, and then the working state of the refrigerating device is controlled. The output side of the circuit breaker QF2 is connected to the input side of the electric heating contactor, the output side of the electric heating contactor is connected to the electric heater, and the control side of the electric heating contactor is connected to the relay KA3, the coil end of the relay KA3 is connected to the main control unit, and the on-off state of the relay KA3 is controlled by the main control unit, thereby controlling the on-off state of the electric heating contactor and the working state of the electric heater; The output side of the circuit breaker QF3 outputs 220V power supply, which is connected to the relays KA1, KA3, KA4 and KA5 to supply power for them; the output side of the relay KA4 is connected to the air inlet valve, the output side of the relay KA5 is connected to the air outlet valve, and the coil ends of the relays KA4 and KA5 are controlled by the main control unit, thereby controlling the states of the air inlet valve and the air outlet valve through the main control unit.

3. The control system for controlling the circulation and temperature conditioning of the air of an enclosed space according to claim 2, characterized in that: The alarm signal of the frequency converter is connected to the main control unit, and when the frequency converter fails, an alarm signal is sent to the main control unit.

4. The control system for controlling the circulation and temperature conditioning of air in an enclosed space according to claim 2, wherein: The refrigerator protector QF1, the circuit breaker QF2 and the circuit breaker QF3 are respectively feedback connected to the main control unit, and when the refrigerator protector QF1, the circuit breaker QF2 and the circuit breaker QF3 fail, an alarm signal is fed back to the main control unit.

5. The control system for controlling the circulation and temperature conditioning of air in an enclosed space according to claim 2, wherein: The output side of the 24V switching power supply outputs 24V DC power supply to supply power for the coil ends of the relays, the main control unit and the touch screen.

6. The control system for controlling the circulation and temperature conditioning of air in an enclosed space according to claim 2, wherein: The input end of the main control unit is connected with a manual mode selection button and an automatic mode selection button, and correspondingly, the output side of the 24V switching power supply is also connected with the relays KA2 and KA6, wherein the relay KA2 is connected with the manual mode indicator light, and the relay KA6 is connected with the automatic mode indicator light; the main control unit controls the lighting state of the corresponding manual mode indicator light and automatic mode indicator light according to the state of the manual mode selection button and the automatic mode selection button.

7. The control system for controlling the circulation and temperature conditioning of air in an enclosed space according to claim 2, wherein: The output side of the 24V switching power supply is also connected to the input side of the relay KA7, the output side of the relay KA7 is connected to the alarm lamp, and the coil end of the relay KA7 is controlled by the main control unit; when the main control unit detects an alarm signal, the coil of the relay KA7 is powered, and the alarm lamp is lit.

8. The control system for controlling the circulation and temperature conditioning of air in an enclosed space according to claim 1, wherein: The control system has two working modes, manual mode and automatic mode, and the selection of the two working modes is realized through the touch screen.

9. The control method of claim 1, wherein, The method comprises the following steps: S1: after the whole control system is powered on, the main control unit detects that the user selects the automatic mode, and then starts the automatic control program; S2: the main control unit controls the states of the air inlet valve and the air outlet valve, and by default, the air inlet duct and the air outlet duct without filter are turned on; at the same time, the main control unit reads the temperature target value set by the user; S3: the main control unit measures the internal temperature of the closed space in real time through the temperature sensor; S4: the main control unit judges whether the measured internal temperature is within the set temperature target range; if yes, no action is taken; if not, the temperature regulation function is started; S5: if the temperature is lower than the set temperature target range, the electric heater is turned on, and the fan is started to heat the incoming air; if the temperature is higher than the set temperature target range, the refrigerator is started, and the fan is started to cool the incoming air; S6: Determine whether the internal temperature measured value after intervention has reached the set target value range; if it has reached the target range, then enter the next step of suspending adjustment, if it has not reached the target value, continue to adjust; S7: If the internal temperature measured value has been in the set target value range, suspend temperature adjustment to close the heating or cooling function, and stop the fan, then return to S4 position to re-determine.

10. The control method of claim 1, wherein, Comprising the following steps: S1: Press the power switch button, after the entire control system is powered on, the main control unit detects that the user selects the automatic mode, and the nuclear probe detects that the radioactivity value reaches the alarm limit, then an alarm is issued and the set control program is started; S2: The main control unit first adjusts the inlet and outlet valves, switches to the inlet and outlet air ducts installed with filters, so that the air passes through the filter before entering the closed space for circulation; S3: The main control unit reads the internal and external pressure difference and internal working temperature target set value of the closed space; S4: The main control unit measures the internal and external pressure difference and internal temperature of the closed space in real time; S5: Determine whether the internal and external pressure difference measured value is in the set target value range; S6: According to the difference between the internal and external pressure difference measured value and the set target value, the wind power of the fan is adjusted accordingly, the wind power is increased when the difference is large, the wind power is gradually reduced when the difference is small, and the current wind power is maintained when the target range is reached and balanced; S7: Determine whether the internal temperature measured value is in the set target value range; S8: If the temperature is lower than the set target range, turn on the electric heater to heat the incoming air; if the temperature is higher than the set target range, turn on the cooler to cool the incoming air; S9: Determine whether the internal temperature measured value after heating or cooling has reached the set target value range; S10: If the internal temperature measured value has been in the set target value range, stop the cooling or heating function, and then return to S7 position to re-determine.

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