Exhaust control circuit and fire extinguishing system

Abstract

The utility model relates to the technical field of energy storage fire fighting, and discloses an exhaust control circuit and a fire fighting system.The circuit comprises a combustible gas detector, a fire fighting feedback switch and a control module, and the combustible gas detector is connected with the control module; the fire-fighting feedback switch is connected with the fire-fighting device and the control module; the control module is connected with the exhaust system; when the control module judges that the concentration of the combustible gas is larger than the preset gas concentration and the fire-fighting feedback switch is switched off, the control module controls the exhaust system to be started; when the control module judges that the concentration of the combustible gas is larger than the preset gas concentration and the fire-fighting feedback switch is closed, the control module controls the exhaust system to be closed. According to the utility model, air exhaust measures can be started in time, the explosion risk is reduced, and an air exhaust system can be closed in time when the fire-fighting device is started, so that the decrease of the concentration of a fire extinguishing agent is reduced, and the fire extinguishing reliability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage fire protection, in particular to an exhaust air control circuit and a fire protection system. Background Art

[0002] In the existing fire protection technology for energy storage systems, when the smoke concentration in the cabin is too high, the opening of the exhaust fan is usually controlled by the closing of the smoke sensor and the temperature sensor to reduce the risks of combustion and explosion. When the fire extinguishing spraying equipment intervenes, due to the untimely linkage between the exhaust fan and the fire extinguishing spraying, when the fire extinguishing spraying action occurs, the exhaust fan cannot stop in time, resulting in the volatilization of the fire extinguishing agent and poor fire extinguishing effect. And when any one of the feedback lines of the smoke sensor and the temperature sensor fails, the exhaust fan cannot be normally started, which is not conducive to starting the exhaust fan. Content of the Utility Model

[0003] Therefore, the technical problem to be solved by the utility model is to solve the problem of poor fire extinguishing effect caused by the inability of the existing exhaust air system to be linked with the fire extinguishing device, so as to provide an exhaust air control circuit and a fire protection system.

[0004] To achieve the above object, the utility model provides the following technical solutions:

[0005] In the first aspect, the utility model provides an exhaust air control circuit, including: a combustible gas detector, a fire protection feedback switch and a control module. Among them, the combustible gas detector is connected to the control module and is used to detect the concentration of combustible gas and send the combustible gas concentration information to the control module; the fire protection feedback switch is connected to an external power supply, a fire protection device and the control module. When the fire protection device is turned on, the fire protection feedback switch is closed; when the fire protection device is turned off, the fire protection feedback switch is opened; the control module is connected to the exhaust air system; when the control module determines that the concentration of combustible gas is greater than a preset gas concentration and the fire protection feedback switch is opened, the control module controls the exhaust air system to start; when the control module determines that the concentration of combustible gas is greater than a preset gas concentration and the fire protection feedback switch is closed, the control module controls the exhaust air system to close.

[0006] The exhaust air control circuit provided by the utility model associates the opening or closing state of the exhaust air system with the opening and closing state of the fire protection device by using the control module. When the control module determines that the concentration of combustible gas is too high, it controls the start and stop of the exhaust air system by judging the switch state of the fire protection feedback switch: when the control module determines that the fire protection feedback switch is in the open state, it indicates that the fire protection device is not turned on at this time, so the control module controls the exhaust air system to start to discharge the combustible gas and reduce the explosion risk; when the control module determines that the fire protection feedback switch is in the closed state, it indicates that the fire protection device has been turned on and is spraying the fire extinguishing agent around, so the control module controls the exhaust air system to close and stop exhausting air, reducing the decrease of the fire extinguishing agent concentration and improving the reliability of fire extinguishing.

[0007] In an alternative embodiment, the fire feedback switch is a micro switch.

[0008] In an alternative embodiment, the control module includes: a control unit, a first switch circuit, and a second switch circuit. Among them, the control unit is connected to the combustible gas detector and the fire feedback switch; the first switch circuit is connected to the exhaust system, the control unit, and the second switch circuit; the second switch circuit is connected to the exhaust system and the control unit; when the control unit determines that the concentration of the combustible gas is greater than the preset gas concentration and the fire feedback switch is off, the first switch circuit and the second switch circuit are turned on, so that the exhaust system is turned on; when the control unit determines that the concentration of the combustible gas is greater than the preset gas concentration and the fire feedback switch is on, the first switch circuit is turned on and the second switch circuit is turned off, so that the exhaust system is turned off.

[0009] In an alternative embodiment, the first switch circuit includes: a first switch, which is connected to the exhaust system, the control unit, and the second switch circuit; when the control unit determines that the concentration of the combustible gas is greater than the preset gas concentration and the fire feedback switch is off, the first switch and the second switch circuit are turned on, so that the exhaust system is turned on; when the control unit determines that the concentration of the combustible gas is greater than the preset gas concentration and the fire feedback switch is on, the first switch is turned on and the second switch circuit is turned off, so that the exhaust system is turned off.

[0010] In an alternative embodiment, the second switch circuit includes: a second switch, which is connected to the exhaust system, the control unit, and the second switch circuit; when the control unit determines that the concentration of the combustible gas is greater than the preset gas concentration and the fire feedback switch is off, the first switch circuit and the second switch are turned on, so that the exhaust system is turned on; when the control unit determines that the concentration of the combustible gas is greater than the preset gas concentration and the fire feedback switch is on, the first switch circuit is turned on and the second switch is turned off, so that the exhaust system is turned off.

[0011] In an alternative embodiment, the exhaust control circuit further includes: a sensing switch circuit, which is connected in parallel with the first switch circuit; when the ambient temperature exceeds the preset temperature and the smoke density in the environment exceeds the preset smoke density, the sensing switch circuit is turned on, and when the fire feedback switch is off, the exhaust system is turned on.

[0012] For the exhaust control circuit provided by the present utility model, the sensing switch circuit and the first switch circuit are redundant to each other. When both the ambient temperature and the smoke concentration exceed the threshold, and the sensing switch circuit fails to control the exhaust system to turn on for exhaust, the first switch circuit can still be turned on according to the concentration of the combustible gas in the environment, so that the exhaust system is turned on, improving the reliability of the exhaust and reducing the explosion risk.

[0013] In an alternative embodiment, the sensing switch circuit includes a smoke sensor switch and a temperature sensor switch. The smoke sensor switch and the temperature sensor switch are connected in series and then connected in parallel with the first switch circuit. The smoke sensor switch is used to detect the smoke concentration in the environment. When the smoke concentration in the environment exceeds the preset smoke concentration, the smoke sensor switch conducts. The temperature sensor switch is used to detect the ambient temperature. When the ambient temperature exceeds the preset temperature, the temperature sensor switch conducts.

[0014] In an alternative embodiment, the smoke sensor switch is one of an ionization smoke sensor switch, a photoelectric smoke sensor switch, and a gas-sensitive smoke sensor switch.

[0015] In an alternative embodiment, the control module is one of a battery management system or an energy management system.

[0016] In a second aspect, the present utility model provides a fire protection system, including an exhaust system, a fire protection device, and the exhaust control circuit of the first aspect.

[0017] The fire protection system provided by the present utility model can associate the on or off state of the exhaust system with the open or closed state of the fire protection device. When the control module determines that the concentration of combustible gas is too high, it controls the start and stop of the exhaust system by judging the switch state of the fire protection feedback switch: when the control module determines that the fire protection feedback switch is in the off state, it indicates that the fire protection device is not turned on at this time, so the control module controls the exhaust system to turn on to discharge the combustible gas and reduce the explosion risk; when the control module determines that the fire protection feedback switch is in the closed state, it indicates that the fire protection device is already turned on and is spraying fire extinguishing agent around, so the control module controls the exhaust system to turn off and stop exhausting, reducing the decrease in the concentration of the fire extinguishing agent and improving the reliability of fire extinguishing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 It is a composition diagram of a specific example of the exhaust control circuit according to an embodiment of the present utility model;

[0020] Figure 2 It is a composition diagram of another specific example of the exhaust control circuit according to an embodiment of the present utility model;

[0021] Figure 3This is a structural diagram of a specific circuit of the exhaust air control circuit according to an embodiment of the present invention. Detailed implementation manners

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0024] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and can also be the internal communication of two elements. It can be a wireless connection or a wired connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0025] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0026] In the prior art, when the concentration of combustible gas in the environment increases or the temperature rises, the exhaust fan is usually controlled to start to reduce the concentration of combustible gas in the environment and reduce the probability of fire occurrence. However, when a fire breaks out and it is necessary to use a fire-fighting device to spray fire-extinguishing gases, foams and other agents, the exhaust fan may not be turned off in time, resulting in a decrease in the concentration of the fire-extinguishing agent, poor fire-extinguishing effect or even inability to extinguish the fire. Therefore,

[0027] This embodiment provides an exhaust air control circuit, as Figure 1As shown in the figure, it includes: a combustible gas detector 1, a fire fighting feedback switch 2 and a control module 3. Among them, the combustible gas detector 1 is connected to the control module 3. The combustible gas detector 1 is used to detect the concentration of combustible gas and send the combustible gas concentration information to the control module 3; the fire fighting feedback switch 2 is connected to an external power supply, a fire fighting device and the control module 3.

[0028] Optionally, the fire fighting device can be a gas fire extinguishing device, a foam fire extinguishing device, an aerosol fire extinguishing device, a dry powder fire extinguishing device, etc., which are devices that extinguish fires by releasing agents such as gases, solids, and liquids.

[0029] Specifically, Figure 1 in it, when the fire fighting device is turned on, the fire fighting feedback switch 2 closes, so that the control module 3 receives the voltage signal of the external power supply, and the level state at the connection port of the control module 3 and the fire fighting feedback switch 2 changes; when the fire fighting device is turned off, the fire fighting feedback switch 2 disconnects, so that the control module 3 is open-circuited from the external power supply, and the level state at the connection port of the control module 3 and the fire fighting feedback switch 2 changes again. Therefore, the control module 3 can judge the on-off state of the fire fighting feedback switch 2 according to the level state at the port, and then judge whether the fire fighting device is turned on to release the agent.

[0030] Figure 1 in it, the control module 3 is connected to the exhaust system; when the control module 3 determines that the concentration of combustible gas is greater than the preset gas concentration and the fire fighting feedback switch 2 is disconnected, the control module 3 controls the exhaust system to turn on; when the control module 3 determines that the concentration of combustible gas is greater than the preset gas concentration and the fire fighting feedback switch 2 is closed, the control module 3 controls the exhaust system to turn off.

[0031] Specifically, Figure 1 in it, the operator can flexibly set the value of the preset concentration in the control module 3 according to actual needs. When the control module 3 determines that the concentration of combustible gas in the environment is greater than the preset gas concentration and determines that the fire fighting device is not turned on to release the agent according to the disconnection state of the fire fighting feedback switch 2, the control module 3 controls the exhaust system to turn on to reduce the concentration of combustible gas in the environment and reduce the risk of explosion. When the control module 3 determines that the concentration of combustible gas in the environment is greater than the preset gas concentration and determines that the fire fighting device is turned on and releases the agent according to the closed state of the fire fighting feedback switch 2, the control module 3 cuts off the control circuit of the exhaust system to control the exhaust system to turn off, avoiding the discharge of the agent concentration in the environment, ensuring that the fire extinguishing agent remains in the environment to play a role, and improving the reliability of fire extinguishing.

[0032] Optionally, the exhaust system can include an exhaust fan, an exhaust blower, a purification device, etc., which can discharge exhaust gases such as smoke and polluted gases in the room.

[0033] Optionally, a variety of sensing switches can also be added to the control circuit of the exhaust system. When the sensing switch determines that there is an explosion risk in the environment based on the ambient temperature and smoke concentration, the sensing switch conducts to turn on the exhaust system, reducing the ambient temperature and the concentration of combustible gases, and reducing the explosion risk. The installation position of the sensing switch needs to ensure that when the fire-fighting feedback switch 2 is closed, the control module 3 can reliably cut off the control circuit of the exhaust system and control the exhaust system to close.

[0034] Optionally, the fire-fighting feedback switch 2 is a microswitch, and its moving contact is connected to the switch of the fire-fighting device, and it can quickly switch its on-off state according to the on-off state of the fire-fighting device.

[0035] The exhaust control circuit provided by the present utility model associates the on-off state of the exhaust system of the control module with the on-off state of the fire-fighting device. When the control module determines that the concentration of combustible gas is too high, it controls the start and stop of the exhaust system by judging the switch state of the fire-fighting feedback switch: when the control module determines that the fire-fighting feedback switch is in the off state, it indicates that the fire-fighting device is not turned on at this time, so the control module controls the exhaust system to turn on to discharge the combustible gas and reduce the explosion risk; when the control module determines that the fire-fighting feedback switch is in the closed state, it indicates that the fire-fighting device is already turned on and is spraying fire extinguishing agent around, so the control module controls the exhaust system to close and stop exhausting, reducing the decrease in the concentration of the fire extinguishing agent and improving the reliability of fire extinguishing.

[0036] In an alternative embodiment, as Figure 2 shown, the control module 3 includes: a first switch circuit 31, a second switch circuit 32 and a control unit 31. Among them, the control unit 33 is connected to the combustible gas detector 1 and the fire-fighting feedback switch 2; the first switch circuit 31 is connected to the exhaust system, the control unit 33 and the second switch circuit 32; the second switch circuit 32 is connected to the exhaust system and the control unit 33.

[0037] Specifically, as Figure 3 shown, the first switch circuit 31 and the second switch circuit 32 are integrated in the control unit 33. The first switch circuit 31 includes a normally open first switch DO1, and the second switch circuit 32 includes a normally closed second switch DO2. The moving contacts of the first switch DO1 and the second switch DO2 act under the action of the control unit 33. The first switch DO1 and the second switch DO2 are connected in series in the control circuit of the exhaust system.

[0038] Specifically, Figure 3In the case where the control unit 33 determines that the concentration of combustible gas in the environment is greater than the preset gas concentration according to the concentration information fed back by the combustible gas detector 1, and the fire feedback switch 2 is turned off so that the DI2H pin of the control unit 33 is at a low level, the first switch DO1 and the second switch DO2 are turned on under the action of the control unit 33, enabling the exhaust system to start; when the control unit 33 determines that the concentration of combustible gas in the environment is greater than the preset gas concentration according to the concentration information fed back by the combustible gas detector 1, and the fire feedback switch 2 is closed so that the DI2H pin of the control unit 33 receives the voltage of the external power supply VDD and becomes high, under the action of the control unit 33, the first switch DO1 is turned on and the second switch DO2 is turned off, causing the exhaust system to close.

[0039] It should be noted that the control logic of the exhaust system can also be: when the DI2H pin of the control unit 33 is at a high level, the exhaust system is controlled to start; when the DI2H pin of the control unit 33 is at a low level, the exhaust system is controlled to close, that is, the state of the level signal of the DI2H pin that drives the first switch DO1 and the second switch DO2 to act is not restricted here.

[0040] In an alternative embodiment, as Figure 2 shown, the exhaust control circuit further includes: a sensing switch circuit 4 connected in parallel with the first switch circuit 31.

[0041] Specifically, Figure 3 in the case where the sensing switch circuit 4 determines that the ambient temperature exceeds the preset temperature and the smoke concentration in the environment exceeds the preset smoke concentration, the sensing switch circuit 4 is turned on. At this time, if the fire feedback switch is also turned off, the second switch DO2 is turned on, the exhaust system control loop is turned on, and the exhaust system starts. The sensing switch circuit 4 and the first switch circuit 31 are designed redundantly. When both the ambient temperature and the smoke concentration exceed the thresholds and the sensing switch circuit 4 fails to control the exhaust system to start for exhaust, the control unit 33 can still control the first switch DO1 to turn on according to the concentration of combustible gas in the environment, enabling the exhaust system to start, improving the reliability of exhaust and reducing the explosion risk.

[0042] In an alternative embodiment, as Figure 3 shown, the sensing switch circuit 4 includes: a temperature sensor switch DZ1 and a smoke sensor switch DZ2. Among them, the temperature sensor switch DZ1 and the smoke sensor switch DZ2 are connected in series and then connected in parallel with the first switch circuit 31; the temperature sensor switch DZ1 is used to detect the ambient temperature and is turned on when the ambient temperature exceeds the preset temperature; the smoke sensor switch DZ2 is used to detect the smoke concentration in the environment and is turned on when the smoke concentration in the environment exceeds the preset smoke concentration.

[0043] Specifically, when a fire occurs, the thermal runaway in the environment causes the temperature sensor switch DZ1 to trigger and conduct, and the increase in the smoke concentration causes the smoke sensor switch DZ2 to trigger and conduct simultaneously, then the exhaust system is turned on, avoiding the mis-triggering of the exhaust system.

[0044] Optionally, Figure 3 in, the temperature sensor switch DZ1 can select a detector with a low trigger alarm value. For example, it conducts and gives an alarm when the ambient temperature exceeds 65°C.

[0045] Optionally, Figure 3 in, the smoke sensor switch DZ2 can select an ionization smoke sensor switch, a photoelectric smoke sensor switch, or a gas-sensitive smoke sensor switch.

[0046] Optionally, Figure 3 in, the control unit 33 is a battery management system or an energy management system. The action thresholds of the first switch DO1 and the second switch DO2 can be set in the battery management system or the energy management system, which is convenient for subsequent development and verification and speeds up the iteration / development progress of the product.

[0047] In a second aspect, the present utility model provides a fire protection system, including: an exhaust system, a fire protection device, and an exhaust control circuit of the above embodiments and any optional implementation manners thereof. The action principle and process of the fire protection system are the same as the above content and will not be elaborated here.

[0048] The fire protection system provided by the present utility model can associate the on / off state of the exhaust system with the on / off state of the fire protection device. When the control module determines that the concentration of combustible gas is too high, it controls the start and stop of the exhaust system by judging the switch state of the fire protection feedback switch: when the control module determines that the fire protection feedback switch is in the off state, it indicates that the fire protection device is not turned on at this time, then the control module controls the exhaust system to turn on to discharge the combustible gas and reduce the explosion risk; when the control module determines that the fire protection feedback switch is in the closed state, it indicates that the fire protection device is already turned on and is spraying fire extinguishing agent around, then the control module controls the exhaust system to turn off and stop exhausting, reducing the decrease in the concentration of the fire extinguishing agent and improving the reliability of fire extinguishing.

[0049] Although the embodiments of the present utility model are described with reference to the drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present utility model, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. An exhaust air control circuit, characterized in that, Comprising: A combustible gas detector, a fire feedback switch and a control module, wherein, The combustible gas detector is connected to the control module, and the combustible gas detector is used to detect the concentration of combustible gas and send the combustible gas concentration information to the control module; The fire feedback switch is connected to an external power supply, a fire fighting device and the control module. When the fire fighting device is turned on, the fire feedback switch closes; when the fire fighting device is turned off, the fire feedback switch disconnects; The control module is connected to an exhaust system; when the control module determines that the concentration of the combustible gas is greater than a preset gas concentration and the fire feedback switch is disconnected, the control module controls the exhaust system to turn on; When the control module determines that the concentration of the combustible gas is greater than a preset gas concentration and the fire feedback switch is closed, the control module controls the exhaust system to turn off.

2. The exhaust control circuit according to claim 1, wherein The fire feedback switch is a micro switch.

3. The exhaust air control circuit according to claim 1, wherein, The control module includes: a control unit, a first switch circuit and a second switch circuit, wherein, The control unit is connected to the combustible gas detector and the fire feedback switch; The first switch circuit is connected to the exhaust system, the control unit and the second switch circuit; The second switch circuit is connected to the exhaust system and the control unit; When the control unit determines that the concentration of the combustible gas is greater than a preset gas concentration and the fire feedback switch is disconnected, the first switch circuit and the second switch circuit are turned on, so that the exhaust system is turned on; When the control unit determines that the concentration of the combustible gas is greater than a preset gas concentration and the fire feedback switch is closed, the first switch circuit is turned on and the second switch circuit is turned off, so that the exhaust system is turned off.

4. The exhaust air control circuit according to claim 3, characterized in that, The first switch circuit includes: The first switch is connected to the exhaust system, the control unit and the second switch circuit; When the control unit determines that the concentration of the combustible gas is greater than a preset gas concentration and the fire feedback switch is disconnected, the first switch and the second switch circuit are turned on, so that the exhaust system is turned on; When the control unit determines that the concentration of the combustible gas is greater than a preset gas concentration and the fire feedback switch is closed, the first switch is turned on and the second switch circuit is turned off, so that the exhaust system is turned off.

5. The exhaust air control circuit according to claim 3, characterized in that, The second switch circuit includes: The second switch is connected to the exhaust system, the control unit and the second switch circuit; When the control unit determines that the concentration of the combustible gas is greater than a preset gas concentration and the fire feedback switch is disconnected, the first switch circuit and the second switch are turned on, so that the exhaust system is turned on; When the control unit determines that the concentration of the combustible gas is greater than a preset gas concentration and the fire feedback switch is closed, the first switch circuit is turned on and the second switch is turned off, so that the exhaust system is turned off.

6. The exhaust air control circuit according to claim 3, characterized in that, Further comprising: A sensing switch circuit is connected in parallel with the first switch circuit; When the ambient temperature exceeds the preset temperature and the smoke density in the environment exceeds the preset smoke density, the sensing switch circuit is turned on, and when the fire feedback switch is turned off, the exhaust system is turned on.

7. The exhaust air control circuit according to claim 6, wherein, The sensing switch circuit includes: a smoke sensor switch and a temperature sensor switch, where the smoke sensor switch and the temperature sensor switch are connected in series and then connected in parallel with the first switch circuit; the smoke sensor switch is used to detect the smoke density in the environment. When the smoke density in the environment exceeds the preset smoke density, the smoke sensor switch is turned on; the temperature sensor switch is used to detect the ambient temperature. When the ambient temperature exceeds the preset temperature, the temperature sensor switch is turned on.

8. The exhaust air control circuit according to claim 7, wherein the smoke sensor switch is one of an ionization smoke sensor switch, a photoelectric smoke sensor switch, and a gas-sensitive smoke sensor switch.

9. The exhaust air control circuit according to claim 1, wherein the control module is one of a battery management system or an energy management system.

10. A fire protection system, characterized in that, Comprising: an exhaust system, a fire protection device, and the exhaust air control circuit according to any one of claims 1 to 9.

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