Applicable to ventilation system and system control box in gas fire protection area

Abstract

The present invention relates to a ventilation system and a system control box suitable for use in a gas fire extinguishing protection zone, which includes a ventilation fan, a fully automatic fire damper, a gas fire extinguishing control panel and a system control box; the ventilation fan is arranged at the exhaust port of the gas fire extinguishing protection zone; the fully automatic fire damper is respectively arranged at the air inlet of the gas fire extinguishing protection zone and at the exhaust pipe port of the ventilation fan; the purpose of the present invention is to provide a ventilation system and a system control box suitable for use in a gas fire extinguishing protection zone. The advantages of the present invention are: when the ventilation fan is turned on, the reset control end of the fully automatic fire damper can be linked to control the opening of the valve, and when the fire control signal of the gas fire extinguishing control panel controls the closing of the fully automatic fire damper, the ventilation fan can be linked to be forcibly closed, thereby ensuring the interlocking operation between the ventilation fan and the fully automatic fire damper.

Description

Technical Field

[0001] The invention relates to the field of motors and ventilation control, in particular to a ventilation system suitable for a gas fire extinguishing protection area and a system control box thereof. Background Art

[0002] According to the requirements of "Heating, Ventilation and Air Conditioning Design Code" GB50019, it is necessary to install ventilation fans in the protection area of ​​the gas fire extinguishing system. On the one hand, it can be used for normal ventilation. On the other hand, it is mainly used to remove the fire extinguishing agent in the protection area and replace it with fresh outdoor air after the gas fire extinguishing is completed.

[0003] In order to form a closed space in the protection area during fire extinguishing, prevent the loss of fire extinguishing agent diffusion, improve the efficiency of fire extinguishing, and prevent the spread of smoke, it is necessary to install a 70℃ fire damper on the ventilation duct inside the gas fire extinguishing protection area. At the same time, according to the requirements of the "Design Specifications for Automatic Fire Alarm Systems" GB50116: After a fire occurs, before the gas fire extinguishing device is activated, the ventilation fan in the protection area and the 70℃ fire damper installed on the ventilation duct will be closed in linkage, and the doors and windows of the gas fire extinguishing protection area will also be closed in linkage. After the doors, windows, pipeline fire dampers and other openings are closed in linkage, the fire extinguishing agent is sprayed, the deflation indicator light is on, and personnel are not allowed to enter the protection area. Since the fire extinguishing agent (such as heptafluoropropane, etc.) of gas fire extinguishing is toxic at a certain concentration, after the gas fire extinguishing is completed, in order to ensure the safety of personnel entering the protection area, the ventilation fan should be turned on to ventilate the gas fire extinguishing protection area.

[0004] The prior art has the following defects:

[0005] 1. During fire extinguishing, fire doors, windows and common 70℃ fire dampers are all closed in conjunction. At the same time, for special management and to prevent misoperation, the common 70℃ fire dampers, ventilation fan control box and ventilation fan are arranged together inside the gas fire extinguishing protection area for special management and to prevent misoperation. Therefore, after the gas fire extinguishing is over, personnel outside the protection area cannot enter the area to manually open and reset the common 70℃ fire dampers, and the connection between the ventilation duct and the outside is still blocked by the common 70℃ fire dampers. After the gas fire extinguishing is completed, before the ventilation fan is turned on, the prior art controller cannot automatically reset and open the closed ordinary 70℃ fire damper on the ventilation duct, thereby failing to keep the ventilation duct connected to the outdoors, resulting in the inability to complete ventilation, and therefore failing to replace the indoor fire extinguishing agent to the outdoors; on the other hand, since the ventilation duct is blocked and closed, if the ventilation fan is turned on at this time, the ventilation fan will continuously inflate the ventilation duct, causing the internal gas pressure of the connected exhaust duct to continue to increase, which will damage the ventilation duct and the ordinary 70℃ fire damper installed thereon.

[0006] 2. The existing ventilation fan control box has a single function. In normal times when there is no fire, it can only manually control the start and stop of the ventilation fan. When the ventilation fan is manually turned on, it will run for a long time and needs to be manually turned off by the maintenance manager; when the ventilation fan is manually turned off, it needs to be manually turned on and restored by the maintenance manager. Therefore, a dedicated person is required to perform maintenance and management. At the same time, if the maintenance manager forgets to turn off the ventilation fan, the fan will run for a long time, which will not only shorten the service life of the ventilation fan, but also waste electricity, which is not energy-saving enough. Summary of the invention

[0007] The object of the present invention is to provide a ventilation system and a system control box suitable for a gas fire extinguishing protection area.

[0008] The object of the present invention is achieved through the following technical solutions: A ventilation system suitable for use in a gas fire extinguishing protection area, comprising a ventilation fan, a fully automatic fire damper, a gas fire extinguishing control panel and a system control box;

[0009] The ventilation fan is arranged at the exhaust port of the gas fire extinguishing protection zone; the fully automatic fire damper is respectively arranged at the air inlet of the gas fire extinguishing protection zone and the exhaust port of the ventilation fan;

[0010] The system control box is provided with an indoor manual start / stop button and an outdoor manual start / stop button. The system control box manually controls the opening or closing of the ventilation fan through the indoor manual start / stop button or the outdoor manual start / stop button. When the system control box controls the ventilation fan to open, the reset control end of the full-automatic fire damper is linked to open the valve. The gas fire extinguishing control panel is associated with the system control box. When a fire warning is issued, the gas fire extinguishing control panel controls the closing of the full-automatic fire damper, and controls the closing of the ventilation fan through the system control box.

[0011] The utility model relates to a system control box for controlling the internal ventilation system of a gas fire extinguishing protection area.

[0012] Compared with the prior art, the advantages of the present invention are:

[0013] 1. When the ventilation fan is turned on, the reset control end of the full-automatic fire damper can be linked to control the opening of the valve, and when the fire control signal of the gas fire extinguishing control panel controls the full-automatic fire damper to close, the ventilation fan can be linked and forced to close, thereby ensuring the interlocking operation between the ventilation fan and the full-automatic fire damper.

[0014] 2. After the gas fire extinguishing is completed, the operating system control box can be used to first open the fully automatic fire damper on the ventilation duct to keep the ventilation duct unobstructed with the outdoors, and then start the ventilation fan to perform sequential control functions for ventilation and exhaust.

[0015] 3. When no fire occurs, the system control box can realize the automatic control function of timing operation of the ventilation fan in the gas fire extinguishing protection area during a certain working period and timing shutdown during other periods. The timing period can be adjusted 24 hours a day. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The present invention is a structural schematic diagram of a ventilation system suitable for use in a gas fire extinguishing protection area.

[0017] Figure 2 It is the circuit diagram of the main power distribution circuit of the fan in the system control box in Example 1 (using DC24V fully automatic fire damper).

[0018] Figure 3 This is a circuit diagram of another fan power distribution main circuit of the system control box in Example 1 (using DC24V fully automatic fire damper).

[0019] Figure 4 It is a circuit diagram of the system control circuit of the system control box in Example 1.

[0020] Figure 5 It is the circuit diagram of the main power distribution circuit of the fan in the system control box in Example 2 (using AC220V fully automatic fire damper).

[0021] Figure 6 It is the circuit diagram of the system control circuit of the system control box in Example 2 (using AC220V fully automatic fire damper).

[0022] Figure 7 It is the circuit diagram of the universal transfer switch SA.

[0023] Figure 8 This is the linkage closing control circuit diagram of the fully automatic fire damper. (When the fire damper is fully opened, SA1 is connected to the S terminal, the solenoid coil YA is energized, and the fire damper is closed; when the fire damper is fully closed, SA1 is connected to the V terminal, and the fire damper closing status signal is fed back)

[0024] Fig. 9 It is a linkage control circuit module of the gas fire extinguishing control panel.

[0025] Fig.10It is the reset control circuit diagram of the fully automatic fire damper (when the fire damper is fully closed, SA2 is connected to the S end and SA3 is connected to the V end; when the fire damper is fully opened, SA2 is connected to the V end and SA3 is connected to the S end; SA4 and SA5 are both switched to the other end during the reset process of the fire damper from fully closed to fully open, and remain until fully reset, and then return to the initial end).

[0026] Fig.11 It is the operation diagram of the fully automatic fire damper valve open-close-reset.

[0027] Fig.12 This is a wiring terminal diagram of the ventilation system in the gas fire extinguishing protection area in Example 1 (using DC24V fully automatic fire damper).

[0028] Fig.13 This is the wiring terminal diagram of the ventilation system in the gas fire extinguishing protection area in Example 2 (using AC220V fully automatic fire damper).

[0029] Fig.14 It is the equipment and material list of the ventilation system in the gas fire extinguishing protection area.

[0030] Explanation of numbers: 1 ventilation fan, 1-1 exhaust duct, 1-2 outdoor exhaust outlet, 1-3 protective filter, 1-4 check valve, 1-5 indoor exhaust outlet, 2 fully automatic fire damper, 3 gas fire extinguishing control panel, 4 system control box, 4-1 indoor manual start / stop button, 4-2 outdoor manual start / stop button, 5 fire door, 6 air inlet. DETAILED DESCRIPTION

[0031] The present invention is described in detail below with reference to the accompanying drawings and embodiments:

[0032] like Figures 1 to 14 Shown is a schematic diagram of an embodiment of a ventilation system suitable for use in a gas fire extinguishing protection area provided by the present invention.

[0033] A ventilation system suitable for use in a gas fire extinguishing protection area, comprising a ventilation fan 1, a fully automatic fire damper 2, a gas fire extinguishing control panel 3 and a system control box 4;

[0034] The ventilation fan 1 is arranged at the exhaust port of the gas fire extinguishing protection zone; the fully automatic fire damper 2 is respectively arranged at the air inlet of the gas fire extinguishing protection zone and at the exhaust port of the ventilation fan 1;

[0035] The system control box 4 is provided with an indoor manual start / stop button and an outdoor manual start / stop button. The system control box manually controls the opening or closing of the ventilation fan 1 through the indoor manual start / stop button or the outdoor manual start / stop button. When the system control box 4 controls the ventilation fan 1 to be turned on, the reset control end of the automatic fire damper 2 is linked to open the valve.

[0036] The gas fire extinguishing control panel 3 is associated with the system control box 4. When a fire warning is issued, the gas fire extinguishing control panel 3 controls the full-automatic fire damper 2 to close, and controls the ventilation fan 1 to close through the system control box 4.

[0037] The system control box 4 has the following two embodiments:

[0038] Embodiment 1:

[0039] The system control box 4 includes a fan power distribution main circuit, a fire damper reset power supply circuit and a system control circuit;

[0040] The fan power distribution main circuit includes a fan motor, a thermal relay KH, a normally open main contact of a contactor KM1, a fan power distribution protection circuit breaker and a fan power supply. The electrical components in the fan power distribution main circuit are connected in series.

[0041] The system control circuit includes a control power supply, a self-locking unit, a normally closed contact of an intermediate relay 1KA, a coil of an intermediate relay KM2 and a thermal relay KH which are connected in series; the self-locking unit includes an indoor stop button SS1, an indoor start button SF1, an outdoor stop button SS2, an outdoor start button SF2, a coil of a contactor KM1 and a normally open auxiliary contact of the contactor KM1; the indoor stop button SS1, the outdoor stop button SS2, the normally open auxiliary contact of the contactor KM1 and the coil of the contactor KM1 are connected in series, and the indoor start button SF1 and the outdoor start button SF2 are connected in parallel with the normally open auxiliary contact of the contactor KM1 respectively (see Figure 4 ).

[0042] The fire damper reset power supply circuit includes a reset power supply and a normally open contact of an intermediate relay KM2, and the reset power supply and the normally open contact of the intermediate relay KM2 are connected in series to the main circuit of the reset control circuit of the full-automatic fire damper 2;

[0043] The reset power supply includes an AC220V / DC24V switching power supply, one end of which is connected between the normally open main contact of the contactor KM1 and the fan power distribution protection circuit breaker, and the other end is connected to the normally open contact of the intermediate relay KM2 (see Figure 2 ).

[0044] Or the normally open contact of the intermediate relay KM2 is directly connected to the output end of the DC24V power supply of the gas fire extinguishing control panel 3, and the gas fire extinguishing control panel 3 is used to provide the DC24V power supply for the fire damper reset (see Figure 3 ).

[0045] The coil of the intermediate relay 1KA is connected in series to the main circuit of the alarm system circuit of the gas fire extinguishing control panel 3; the normally open contact of the intermediate relay 1KA is connected in series to the closing circuit of the full-automatic fire damper 2.

[0046] Embodiment 2:

[0047] The system control box 4 includes a fan power distribution main circuit and a system control circuit;

[0048] The fan power distribution main circuit includes a fan motor, a thermal relay KH, a normally open main contact of a contactor KM1, a fan power distribution protection circuit breaker and a fan power supply. The electrical components in the fan power distribution main circuit are connected in series.

[0049] The system control circuit includes a control power supply, a self-locking unit, a normally closed contact of an intermediate relay 1KA and a thermal relay KH connected in series; the self-locking unit includes an indoor stop button SS1, an indoor start button SF1, an outdoor stop button SS2, an outdoor start button SF2, a contactor KM1 coil and a normally open auxiliary contact of the contactor KM1; the indoor stop button SS1, the outdoor stop button SS2, the normally open auxiliary contact of the contactor KM1 and the coil of the contactor KM1 are connected in series, and the indoor start button SF1 and the outdoor start button SF2 are respectively connected in parallel with the normally open auxiliary contact of the contactor KM1 (see Figure 6 ).

[0050] The main circuit of the reset control circuit of the fully automatic fire damper 2 is connected between the normally open main contact of the contactor KM1 and the fan power distribution protection circuit breaker (see Figure 5 );

[0051] The coil of the intermediate relay 1KA is connected in series to the main circuit of the alarm system circuit of the gas fire extinguishing control panel 3; the normally open contact of the intermediate relay 1KA is connected in series to the closing circuit of the full-automatic fire damper 2.

[0052] The system control circuit also includes a timing unit and a universal conversion switch SA; the timing unit includes a timing switch IH1 and a normally open contact of the timing switch IH1;

[0053] The universal conversion switch SA is connected to the control power supply, the manual end of the universal conversion switch SA is connected to the self-locking unit, the automatic end of the universal conversion switch SA is connected to the normally open contact of the timing switch IH1, and the other end of the normally open contact of the timing switch IH1 is connected to the contactor KM1 coil; the timing switch IH1 is connected to both ends of the control power supply.

[0054] The system control circuit also includes an overload operation indication unit, which includes a normally open contact of a thermal relay KH and a signal lamp HY;

[0055] One end of the normally open contact of the thermal relay KH is connected to the control power supply, and the other end is connected to the signal lamp HY, and the other end of the signal lamp HY is connected to the control power supply.

[0056] The fully automatic fire damper 2 is a 70°C fully automatic fire damper. The 70°C fully automatic fire damper is an existing product.

[0057] The 70℃ fully automatic fire damper is installed on the pipes of ventilation and air conditioning systems with smoke and fire prevention requirements. It is normally open. In case of fire, the valve automatically closes by the reset spring inside the operating device to prevent smoke and fire. Therefore, the fully automatic fire damper can receive two signals, one to close the valve and one to open the valve (automatic reset) through the motor. The detailed function description is as follows:

[0058] 1. The valve opening can be adjusted manually in six levels;

[0059] 2. Temperature control: The temperature sensor activates the valve to close automatically;

[0060] 3. Electric control: DC24V electrical signal controls the action of the electromagnet, and the valve closes automatically; DC24V (or AC220V) driving power supplies power to the reset motor, and the valve resets automatically;

[0061] 4. Manual closing and manual reset;

[0062] 5. Output returns two sets of contact signals.

[0063] The working principle of the present invention is as follows:

[0064] The ventilation fan 1 can usually be controlled by a manual button (SS1 is shut down inside the door, SF1 is turned on inside the door; SS2 is shut down outside the door, SF2 is turned on outside the door), or it can be automatically controlled by a timing unit and turned on at a fixed time every day. The start-up time and operating time are determined by the management department.

[0065] When starting the machine, press the indoor start button SF1 or the outdoor start button SF2, the coil of the contactor KM1 and the coil of the intermediate relay KM2 are energized, and the normally open main contact of the contactor KM1, the normally open auxiliary contact of the contactor KM1 and the normally open contact of the intermediate relay KM2 are closed;

[0066] The fan power distribution main circuit is energized and the fan motor starts running.

[0067] At the same time, the reset control circuit of the full-automatic fire damper 2 is energized. When the valve of the full-automatic fire damper 2 is in a closed state, the valve is controlled to open; when the valve of the full-automatic fire damper 2 is in an open state, reset information feedback is performed. The above process ensures that when the ventilation fan 1 is started, the full-automatic fire damper 2 is always in an open state.

[0068] The indoor start button SF1 or the outdoor start button SF2 will automatically reset and disconnect after being pressed. Since the normally open auxiliary contact of contactor KM1 is closed after the contactor KM1 coil is energized, the current passes through the branch where the normally open auxiliary contact of contactor KM1 is located, so that the system control circuit continues to be energized and operate.

[0069] When shutting down, press the indoor stop button SS1 or the outdoor stop button SS2, the contactor KM1 coil loses power, the normally open main contact of the contactor KM1 is disconnected, and the fan motor stops running;

[0070] Pressing the indoor stop button SS1 or the outdoor stop button SS2 will automatically reset and close. Since the normally open auxiliary contact of contactor KM1 is disconnected after the contactor KM1 coil loses power, the system control circuit is powered off.

[0071] During automatic control, the universal conversion switch SA is adjusted to the automatic end, and the on / off of the normally open contact of the time relay IH1 is controlled by the timer time relay coil IH1 to start / stop the ventilation fan 1.

[0072] When a fire occurs, before the gas fire extinguishing system is activated, the intermediate relay 1KA receives the fire control signal from the gas fire extinguishing control panel 3, the coil of the intermediate relay 1KA is energized, and the normally open contact of the intermediate relay 1KA on the closing circuit of the fully automatic fire damper 2 is closed and connected, so that the internal electromagnet circuit of the fire damper linkage closing is energized, and the electromagnet trips the internal limit mechanism of the fire damper, and the valve plate of the fully automatic fire damper 2 rotates and closes under the action of the spring force, and the fire damper body has its own contact return signal;

[0073] The normally closed contact of the intermediate relay 1KA in the ventilation fan 1 system control circuit is released and disconnected, forcing the machine to shut down.

[0074] After the fire is extinguished and the fire control signal is released, the outdoor start button SF2 can be operated outside the door to reset the fully automatic fire damper 2 and start the ventilation fan 1.

Claims

1. A ventilation system suitable for use in a gas fire extinguishing protection area, characterized in that: It includes a ventilation fan (1), a fully automatic fire damper (2), a gas fire extinguishing control panel (3) and a system control box (4); The ventilation fan (1) is arranged at the exhaust port of the gas fire extinguishing protection zone; the fully automatic fire damper (2) is respectively arranged at the air inlet of the gas fire extinguishing protection zone and at the exhaust port of the ventilation fan (1); The system control box (4) is provided with an indoor manual start / stop button (4-1) and an outdoor manual start / stop button (4-2), and the system control box manually controls the opening or closing of the ventilation fan (1) through the indoor manual start / stop button or the outdoor manual start / stop button, and when the system control box (4) controls the ventilation fan (1) to be turned on, the reset control end of the full-automatic fire damper (2) is linked to open the valve; The gas fire extinguishing control panel (3) is associated with the system control box (4). When a fire warning is given, the gas fire extinguishing control panel (3) controls the full-automatic fire damper (2) to close, and controls the ventilation fan (1) to close through the system control box (4); The system control box (4) comprises a fan power distribution main circuit, a fire damper reset power supply circuit and a system control circuit; The fan power distribution main circuit includes a fan motor, a thermal relay KH, a normally open main contact of a contactor KM1, a fan power distribution protection circuit breaker and a fan power supply. The electrical components in the fan power distribution main circuit are connected in series. The system control circuit includes a control power supply, a self-locking unit, a normally closed contact of an intermediate relay 1KA, a coil of an intermediate relay KM2 and a thermal relay KH which are connected in series; the self-locking unit includes an indoor stop button SS1, an indoor start button SF1, an outdoor stop button SS2, an outdoor start button SF2, a coil of a contactor KM1 and a normally open auxiliary contact of the contactor KM1; the indoor stop button SS1, the outdoor stop button SS2, the normally open auxiliary contact of the contactor KM1 and the coil of the contactor KM1 are connected in series, and the indoor start button SF1 and the outdoor start button SF2 are respectively connected in parallel with the normally open auxiliary contact of the contactor KM1; The fire damper reset power supply circuit comprises a reset power supply and a normally open contact of an intermediate relay KM2, wherein the reset power supply and the normally open contact of the intermediate relay KM2 are connected in series to the main circuit of the reset control circuit of the fully automatic fire damper (2); The intermediate relay 1KA coil is connected in series to the main circuit of the alarm system circuit of the gas fire extinguishing control panel (3); the normally open contact of the intermediate relay 1KA is connected in series to the closing circuit of the full-automatic fire damper (2); Or the system control box (4) includes a fan power distribution main circuit and a system control circuit; The fan power distribution main circuit includes a fan motor, a thermal relay KH, a normally open main contact of a contactor KM1, a fan power distribution protection circuit breaker and a fan power supply. The electrical components in the fan power distribution main circuit are connected in series. The system control circuit includes a control power supply, a self-locking unit, a normally closed contact of an intermediate relay 1KA and a thermal relay KH connected in series; the self-locking unit includes an indoor stop button SS1, an indoor start button SF1, an outdoor stop button SS2, an outdoor start button SF2, a contactor KM1 coil and a normally open auxiliary contact of the contactor KM1; the indoor stop button SS1, the outdoor stop button SS2, the normally open auxiliary contact of the contactor KM1 and the contactor KM1 coil are connected in series, and the indoor start button SF1 and the outdoor start button SF2 are respectively connected in parallel with the normally open auxiliary contact of the contactor KM1; The main circuit of the reset control circuit of the fully automatic fire damper (2) is connected between the normally open main contact of the contactor KM1 and the fan power distribution protection circuit breaker; The intermediate relay 1KA coil is connected in series to the main circuit of the alarm system circuit of the gas fire extinguishing control panel (3); the normally open contact of the intermediate relay 1KA is connected in series to the closing circuit of the full-automatic fire damper (2); The system control circuit also includes a timing unit and a universal conversion switch SA; the timing unit includes a timing switch IH1 and a normally open contact of the timing switch IH1; The universal conversion switch SA is connected to the control power supply, the manual end of the universal conversion switch SA is connected to the self-locking unit, the automatic end of the universal conversion switch SA is connected to the normally open contact of the timing switch IH1, and the other end of the normally open contact of the timing switch IH1 is connected to the coil of the contactor KM1; the timing switch IH1 is connected to both ends of the control power supply; The system control circuit also includes an overload operation indication unit, which includes a normally open contact of a thermal relay KH and a signal lamp HY; One end of the normally open contact of the thermal relay KH is connected to the control power supply, and the other end is connected to the signal light HY, and the other end of the signal light HY is connected to the control power supply; The fully automatic fire damper (2) is a 70°C fully automatic fire damper.

2. A system control box for controlling the internal ventilation system of the gas fire extinguishing protection zone in claim 1, characterized in that: The system control box (4) comprises a fan power distribution main circuit, a fire damper reset power supply circuit and a system control circuit; The fan power distribution main circuit includes a fan motor, a thermal relay KH, a normally open main contact of a contactor KM1, a fan power distribution protection circuit breaker and a fan power supply. The electrical components in the fan power distribution main circuit are connected in series. The system control circuit includes a control power supply, a self-locking unit, a normally closed contact of an intermediate relay 1KA, a coil of an intermediate relay KM2 and a thermal relay KH which are connected in series; the self-locking unit includes an indoor stop button SS1, an indoor start button SF1, an outdoor stop button SS2, an outdoor start button SF2, a coil of a contactor KM1 and a normally open auxiliary contact of the contactor KM1; the indoor stop button SS1, the outdoor stop button SS2, the normally open auxiliary contact of the contactor KM1 and the coil of the contactor KM1 are connected in series, and the indoor start button SF1 and the outdoor start button SF2 are respectively connected in parallel with the normally open auxiliary contact of the contactor KM1; The fire damper reset power supply circuit comprises a reset power supply and a normally open contact of an intermediate relay KM2, wherein the reset power supply and the normally open contact of the intermediate relay KM2 are connected in series to the main circuit of the reset control circuit of the fully automatic fire damper (2); The intermediate relay 1KA coil is connected in series to the main circuit of the alarm system circuit of the gas fire extinguishing control panel (3); the normally open contact of the intermediate relay 1KA is connected in series to the closing circuit of the full-automatic fire damper (2); Or the system control box (4) includes a fan power distribution main circuit and a system control circuit; The fan power distribution main circuit includes a fan motor, a thermal relay KH, a normally open main contact of a contactor KM1, a fan power distribution protection circuit breaker and a fan power supply. The electrical components in the fan power distribution main circuit are connected in series. The system control circuit includes a control power supply, a self-locking unit, a normally closed contact of an intermediate relay 1KA and a thermal relay KH connected in series; the self-locking unit includes an indoor stop button SS1, an indoor start button SF1, an outdoor stop button SS2, an outdoor start button SF2, a contactor KM1 coil and a normally open auxiliary contact of the contactor KM1; the indoor stop button SS1, the outdoor stop button SS2, the normally open auxiliary contact of the contactor KM1 and the contactor KM1 coil are connected in series, and the indoor start button SF1 and the outdoor start button SF2 are respectively connected in parallel with the normally open auxiliary contact of the contactor KM1; The main circuit of the reset control circuit of the fully automatic fire damper (2) is connected between the normally open main contact of the contactor KM1 and the fan power distribution protection circuit breaker; The intermediate relay 1KA coil is connected in series to the main circuit of the alarm system circuit of the gas fire extinguishing control panel (3); the normally open contact of the intermediate relay 1KA is connected in series to the closing circuit of the full-automatic fire damper (2).

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