CN111228680A

CN111228680A - Fire fighting system of intensive storage place and control method thereof

Info

Publication number: CN111228680A
Application number: CN201911308149.5A
Authority: CN
Inventors: 张建楠; 张波; 缪艳丽; 郅俊朋
Original assignee: Tianjin Qmind Technology Ltd
Current assignee: Tianjin Qmind Technology Ltd
Priority date: 2019-12-18
Filing date: 2019-12-18
Publication date: 2020-06-05

Abstract

The invention relates to the field of fire fighting systems, in particular to a fire fighting system for a dense storage place and a control method thereof. A fire protection system for a dense storage site, comprising: the fire extinguishing system comprises a signal acquisition unit, a control unit, a switching power supply, a fire extinguishing unit and an upper computer; the signal acquisition unit comprises smoke temperature composite alarms distributed at respective point positions, and the smoke temperature composite alarms acquire temperature values and smoke concentration values of the intensive storage places; each smoke temperature composite alarm is provided with a unique ID number; the signal acquisition unit analyzes and packages the acquired data, is connected with a physical bus through two output ends CAN _ H and CAN _ L of a CAN control chip and then transmits the data to the control unit; the invention has the function of automatically closing output under the condition of serious CAN node errors, and prevents the operation of other nodes on the bus from being influenced, thereby ensuring that the state of locking the bus due to the problem of individual nodes does not occur.

Description

Fire fighting system of intensive storage place and control method thereof

The technical field is as follows:

the invention relates to the field of fire fighting systems, in particular to a fire fighting system for a dense storage place and a control method thereof.

Background art:

according to a traditional fire fighting system of a storage place, a fire detector senses whether a certain fire detection parameter reaches a specific threshold value to judge whether to give an alarm, the judgment is single according to the judgment, the influence of the environment background or the slow drift of an internal circuit of the detector is caused, and false alarm is easy to generate. The intensive storage fire-fighting system adopted at the present stage lacks the self-diagnosis and self-elimination capabilities of faults, and when some faults occur in the system, the system cannot detect and immediately respond in time, so that a user cannot timely detect the faults after the faults occur in the system, and under the condition, once a fire disaster occurs, the system cannot respond in time and an unimaginable result occurs.

The fire extinguishing device of the traditional fire extinguishing system mostly adopts a physical control method, namely when flame burns to a certain degree, the environment temperature reaches the starting temperature of the glass ball end socket, and the sprinkler head starts to spray water after the glass ball is heated and cracked. In this case, the fire must reach a certain level to reach the starting temperature of the glass ball. And this extinguishing device has disposable, needs to install again after the use, causes manpower and materials extravagant.

In the communication mode, the traditional intensive storage fire-fighting system generally adopts an RS485 bus, the RS485 bus data communication mode is an order type, a slave node can only respond after receiving the order of a master node, some important displacement information cannot be uploaded in time, the flexibility and the real-time performance of the system are poor, and the single-point fault can cause bus fault.

The invention content is as follows:

the invention aims to provide a fire fighting system of a dense storage place with high reliability and a control method thereof. The specific technical scheme is as follows:

a fire protection system for a dense storage site, comprising: the fire extinguishing system comprises a signal acquisition unit, a control unit, a switching power supply, a fire extinguishing unit and an upper computer;

the signal acquisition unit comprises smoke temperature composite alarms distributed at respective point positions, and the smoke temperature composite alarms acquire temperature values and smoke concentration values of the intensive storage places; each smoke temperature composite alarm is provided with a unique ID number; the signal acquisition unit analyzes and packages the acquired data, is connected with a physical bus through two output ends CAN _ H and CAN _ L of a CAN control chip and then transmits the data to the control unit;

the control unit includes: the smoke temperature composite alarm main control unit is respectively connected with a CAN network transmission interface, an Ethernet communication module, a power module and a fire extinguishing equipment control module; the control unit receives the alarm signal and immediately sends a secondary confirmation instruction to the smoke temperature composite alarm corresponding to the ID number to confirm whether the alarm is false alarm or not; if the secondary judgment returns that the signal is still a fire alarm signal, the control unit immediately feeds back the fire information to the upper computer through the Ethernet communication module, and starts the fire extinguishing unit to extinguish the fire.

In the preferred scheme, a CAN _ H bus and a CAN _ L bus adopt a short frame structure, the maximum number of bytes in each frame is 8, and each frame is subjected to CRC (cyclic redundancy check), so that the low error rate of data is ensured; the CAN _ H bus and the CAN _ L bus are communicated in an event triggering mode, and the CAN _ H and the CAN _ L are output ends of a CAN control chip TJA1042T, wherein the state of a CAN _ H end CAN only be in a high level or a suspension state, and the state of a CAN _ L end CAN only be in a low level or a suspension state.

In a further preferred aspect of the preferred embodiment, the switching power supply supplies 24 volts to the power supply module. The fire fighting system control method of the intensive storage place, which is realized on the fire fighting system of the scheme, comprises the following processes:

powering on a system, and carrying out initialization setting;

step 1: the smoke temperature composite alarm main control unit sends ID inquiry instructions to each smoke temperature composite alarm at regular time;

step 2: after receiving the inquiry command, the smoke temperature composite alarm sends the ID number of the smoke temperature composite alarm to the smoke temperature composite alarm main control unit through the CAN bus;

and step 3: the smoke temperature composite alarm main control unit analyzes and judges the data after receiving the data, and determines the working state of each smoke temperature composite alarm; the smoke temperature composite alarm corresponding to the ID number can be received to be in a normal working state, and the step 4 is switched; the smoke temperature composite alarm corresponding to the ID number cannot be received, the device with the problem is temporarily judged, and the step 5 is switched;

and 4, step 4: the smoke temperature composite alarm main control unit starts a receiving control program, analyzes the CAN message from the smoke temperature composite alarm in real time, and turns to the step 7 when an alarm signal is detected, or repeats the step 4;

and 5: the smoke temperature composite alarm main control unit sends a diagnosis instruction to a smoke temperature composite alarm with problems and judges whether the smoke temperature composite alarm works normally again; then turning to step 6;

step 6: judging whether the diagnostic return data can analyze the ID signal, and skipping to the step 4 if the diagnostic return data can analyze the ID signal, or else, turning to the step 9;

and 7: after receiving the alarm information, the smoke-temperature composite alarm main control unit sends a diagnosis instruction for multiple times to confirm whether the alarm information exists, and if the alarm information still exists, the step 8 is carried out; if not, returning to the step 4;

and 8: the smoke-temperature composite alarm main control unit sends a fire extinguishing instruction to the fire extinguishing unit, starts the spraying fire extinguishing unit and prompts a fire signal to workers in an acousto-optic mode;

and step 9: and transmitting the disconnection error information to an upper computer to remind workers to intervene in troubleshooting.

In a further preferred embodiment, the upper computer is a PC.

According to a third preferred scheme, the fire extinguishing unit is a water spraying system, the fire extinguishing control module drives the stepping motor through the power chip, a control water valve of the spraying equipment is opened, and fire extinguishing is started.

Compared with the prior art, the invention has the advantages that:

the smoke temperature composite fire alarm is adopted to simultaneously acquire smoke concentration information and temperature information of a dense space environment, and false alarm caused by inaccurate acquisition of a single temperature value or a smoke concentration value is avoided.

And secondly, in order to ensure that all the equipment of the system normally operate, the signal acquisition unit and the control unit are initialized and set every time the system is electrified. In order to ensure that the system can timely and effectively realize the communication between the control unit and the signal acquisition unit under the normal condition, the signal acquisition unit sends an ID number to the control unit at regular time so as to ensure that the signal acquisition unit is in a normal working state. If the ID number of a certain acquisition unit is not received within a period of time, the control unit can send a wake-up instruction to the acquisition unit by mistake, if the corresponding ID information cannot be received, the control unit judges that the acquisition unit is in a disconnection mode, and at the moment, the upper computer displays the disconnection fault information of the corresponding ID position, so that the working personnel can conveniently remove the fault as soon as possible.

The CAN bus has an automatic detection function, so that the reliability of the system is improved;

the CAN bus adopts a short frame structure, the maximum number of bytes of each frame is 8, the transmission time is short, the interference probability is low, and each frame is subjected to CRC (cyclic redundancy check) to ensure that the data error rate is low;

the CAN bus communication adopts an event triggering mode, two output ends CAN _ H (CAN high) and CAN _ L (CAN low) of a CAN control chip TJA1042T are connected with a physical bus, the state of the CAN _ H (CAN high) end CAN only be in a high level or suspension state, and the state of the CAN _ L (CAN low) end CAN only be in a low level or suspension state, so that the phenomenon that when the system has errors and multiple nodes send data to the bus at the same time, the bus is in a short circuit, and certain nodes are damaged CAN be avoided; the CAN node has the function of automatically closing output under the condition of serious errors, and prevents the operation of other nodes on the bus from being influenced, thereby ensuring that the state of 'locking' of the bus due to the problem of individual nodes CAN not occur.

(VI) the smoke temperature composite fire alarm analyzes and packs the collected temperature or smoke concentration information, the temperature or smoke concentration information is transmitted to the control unit through two signal lines of CAN _ H (CAN high) and CAN _ L (CAN low), after the control unit detects an alarm signal, the control unit immediately sends a secondary confirmation instruction to the smoke temperature composite fire alarm corresponding to the ID to confirm whether the fire alarm is false alarm or not, if the secondary judgment returns that the signal is still the fire alarm signal, the control module immediately feeds back the fire information to an upper computer display interface, and a spraying control system and a sound-light alarm system are started. This design increases the reliability of the system.

Description of the drawings:

FIG. 1 is a schematic diagram of a fire fighting system according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of a power conversion module for converting 24V to 5V of the smoke temperature composite alarm in the embodiment; the positive electrode and the negative electrode of the power supply are connected into a 24V power supply through a P2 interface and are transmitted to a DCDC (RT7272BGSP) chip through an anti-reverse chip MB6S, so that the conversion from 24V to 5V is realized.

FIG. 3 is a schematic diagram of a power conversion module for converting 5V to 3.3V of the smoke temperature composite alarm in the embodiment; the 5V voltage from RT7272BGSP passes through an LDO (TPL730F33-5TR) chip to realize the conversion from 5V to 3.3V.

FIG. 4 is a schematic diagram of an MCU module of the smoke temperature composite alarm in the embodiment; in the figure, RIN1 is used for an ADC acquisition interface of a temperature Sensor, Sensor _ LED _ R is used for an ADC acquisition interface of a smoke receiving tube, PB0, PB1, USART _ TX, USART _ RX, PA8, PA9, PA10, and RIN2 are reserved interfaces, PA11, and PA12 are CAN data transmission/reception interfaces, BOOT0, and BOOT1 pins are used for an external BOOT setting circuit, a BELL _ Alarm external sound Alarm circuit, an LED _ Alarm external light Alarm circuit, a Relay _ M external Relay control circuit, and MCU _ LED _ T is used for controlling the smoke maze receiving tube, and a do jtst, JTRST, SWDIO, SWCLK, JTDI, and JTAG external download circuit.

FIG. 5 is a schematic diagram of a smoke maze driving circuit of the smoke temperature compound alarm in the embodiment; the driving and control functions of the infrared diode transmitting tube and the infrared diode receiving tube are achieved, wherein P4 and P5 are external interfaces of the transmitting tube and the receiving tube respectively, and Sensor _ LED _ T and Sensor _ LED _ R are IO control interfaces connected with the single chip microcomputer respectively.

FIG. 6 is a schematic diagram of a light alarm circuit of the smoke temperature composite alarm in the embodiment; in the figure, the LED1 and the LED2 are two Alarm indicating lamps of the smoke temperature composite Alarm, the LED _ Alarm is in butt joint with a control pin corresponding to the MCU in the figure, and the light Alarm function is realized by the output control of the pin.

FIG. 7 is a schematic diagram of an audible alarm circuit of the smoke temperature composite alarm in the embodiment; in the figure, S1 is a buzzer interface, and BELL _ Alarm is connected to a control pin corresponding to the MCU to implement an audible Alarm function.

FIG. 8 is a schematic diagram of a relay control circuit of the smoke temperature composite alarm in the embodiment; in the figure, Relay _ M is a pin of a single-chip microcomputer control Relay, P1 is a Relay output mode selection, and is normally open or normally closed, and P3 is an external output interface of the Relay.

FIG. 9 is a schematic circuit diagram of a temperature acquisition module of the smoke temperature composite alarm in the embodiment; in the figure, R51 is a thermistor access interface, RIN1 is a singlechip control interface, and is connected with the corresponding interface of the singlechip.

FIG. 10 is a schematic circuit diagram of a CAN acquisition module of the smoke temperature composite alarm in the embodiment; in the figure, PA11 and PA12 are respectively a transceiving interface for communication between a CAN bus and a single chip microcomputer, and P6 is a CAN high bus interface and a CAN low bus interface for communication with a smoke temperature composite alarm main control system.

FIG. 11 is a schematic diagram of a download circuit of the smoke temperature composite alarm in the embodiment; the download circuit is that the compound alarm of cigarette temperature downloads the circuit, realizes the program download and the function debugging of singlechip, and J1 is double paster row needle, with JLINK equipment butt joint.

FIG. 12 is a schematic diagram of a power protection circuit of a smoke temperature composite alarm main control unit in the embodiment; the anti-reverse-connection circuit comprises an anti-reverse-connection circuit, an overcurrent protection circuit, an EMC protection circuit and an LC filter circuit.

Fig. 13 and 14 show a power conversion module of the smoke temperature composite alarm main control unit in the embodiment, which realizes a conversion function from 24V to 5V and performs shunt processing on the current of the whole circuit.

FIG. 15 is a power conversion module of the smoke temperature composite alarm main control unit in the embodiment, and a power conversion circuit for converting 5V into 3.3V, which is used for supplying power to a single chip microcomputer alone.

FIG. 16 shows a power conversion module of the smoke temperature composite alarm main control unit in the embodiment, and a power conversion circuit for converting 5V into 3.3V, which is used for supplying power to the outside of the single chip microcomputer.

FIG. 17 is a schematic diagram of an indicating lamp circuit of a smoke temperature composite alarm main control unit in the embodiment; in the figure, DS9 denotes a 5V power source indicator lamp, DS10 denotes a 3.3V power source indicator lamp, DS1 denotes a communication indicator lamp of CAN0, DS2 denotes a communication indicator lamp of CAN1, DS3 denotes a communication indicator lamp of CAN2, DS4 denotes a communication indicator lamp of CAN3, DS5 denotes a communication indicator lamp of CAN4, DS6 denotes a communication indicator lamp of CAN5, DS7 denotes a communication indicator lamp of CAN6, and DS8 denotes a communication indicator lamp of CAN 7.

FIG. 18 is a schematic diagram of an MCU power supply access circuit of the smoke temperature composite alarm main control unit in the embodiment; the circuit supplies power for ADC, HVA, HVB, LV and FLASH in the chip respectively.

FIG. 19 is a filter circuit of the smoke temperature composite alarm main control unit ADC, HVA, HVB, LV and FLASH in the embodiment; the filter capacitor removes signals in a certain frequency band from the total signal.

FIG. 20 is a crystal oscillator circuit of a single chip microcomputer of the smoke temperature composite alarm main control unit in the embodiment; 32.768KHZ and 40MHZ crystal oscillator circuits are reserved to provide clock frequencies under different requirements of the system.

Fig. 21, 22, 23, 24 and 25 show GPIO interfaces of the smoke temperature composite alarm main control unit in the embodiment, which implement real-time and accurate control of the CAN, ethernet, motor control and LED indication circuits.

FIG. 26 is a circuit for downloading a single chip microcomputer of the smoke temperature composite alarm main control unit in the embodiment, which realizes program downloading and function debugging of the single chip microcomputer.

FIG. 27 is an Ethernet circuit of the smoke temperature composite alarm main control unit in the embodiment; the data transmission of 100Mb/s can be realized at most, and J2 is an Ethernet external interface in the figure.

FIG. 28 is a motor control circuit of the smoke temperature composite alarm main control unit in the embodiment; u11 is motor drive chip, links to each other with the singlechip through DB0-DB3, realizes the control to motor B1.

FIG. 29 is a CAN information acquisition circuit of a smoke temperature composite alarm main control unit in the embodiment; the circuit has 8 groups of CAN communication circuits which are the same as the CAN communication circuits in the previous figure, are respectively connected with the singlechip through respective CAN transmitting interfaces and receiving interfaces, and are communicated with the smoke temperature composite alarms through CAN high and CAN low.

FIG. 30 is a schematic diagram of an interface circuit of a smoke temperature composite alarm main control unit in the embodiment; in the figure, CAN0_ CONN _ P-CAN 7_ CONN _ P represents a CAN high bus, CAN0_ CONN _ N-CAN 7_ CONN _ N represents a CAN low bus, the CAN high bus and the CAN low bus respectively correspond to 8 smoke alarms, and Power and DGND represent a Power supply and a ground wire respectively.

FIG. 31 is a flow chart illustrating a control method according to the present invention.

The specific implementation mode is as follows:

example (b):

the signal acquisition unit comprises smoke temperature composite alarms distributed at respective point positions, and the smoke temperature composite alarms acquire temperature values and smoke concentration values of the intensive storage places; each smoke temperature composite alarm is provided with a unique ID number; the signal acquisition unit analyzes and packages the acquired data, is connected with a physical bus through two output ends CAN _ H and CAN _ L of a CAN control chip and then transmits the data to the control unit; the CAN _ H bus and the CAN _ L bus adopt a short frame structure, the maximum number of bytes in each frame is 8, and each frame is subjected to CRC (cyclic redundancy check), so that the low error rate of data is ensured; the CAN _ H bus and the CAN _ L bus are communicated in an event triggering mode, and the CAN _ H and the CAN _ L are output ends of a CAN control chip TJA1042T, wherein the state of a CAN _ H end CAN only be in a high level or suspension state, and the state of a CAN _ L end CAN only be in a low level or suspension state;

the control unit includes: the main control unit is respectively connected with the CAN network transmission interface, the Ethernet communication module, the power module and the fire extinguishing equipment control module; the main control unit receives the alarm signal and immediately sends a secondary confirmation instruction to the smoke temperature composite alarm corresponding to the ID number to confirm whether the alarm is false alarm or not; if the returned signal is judged to be a fire alarm signal for the second time, the main control unit immediately feeds back the fire information to the upper computer through the Ethernet communication module and starts the fire extinguishing module to extinguish the fire;

the upper computer is a PC; the switching power supply provides 24V voltage for the power supply module; the fire extinguishing unit is a water spraying system, the fire extinguishing control module drives a stepping motor through a power chip, a control water valve of spraying equipment is opened, and fire extinguishing is started; after the fire is relieved, the spraying device can be manually reset. The spraying fire extinguishing system controlled by the electronic device can reduce the loss caused by the late operation of the sprinkler head of the glass ball sprinkler head, and can also avoid the waste caused by disposable use.

The fire fighting system control method of the intensive storage place, which is realized on the fire fighting system of the scheme, comprises the following processes:

powering on a system, and carrying out initialization setting;

Claims

1. A fire protection system for a dense storage site, comprising: the fire extinguishing system comprises a signal acquisition unit, a control unit, a switching power supply, a fire extinguishing unit and an upper computer;

2. The fire fighting system for the dense storage space according to claim 1, wherein the CAN _ H bus and the CAN _ L bus adopt a short frame structure, each frame has a maximum of 8 bytes, and each frame has CRC check, ensuring a low data error rate; the CAN _ H bus and the CAN _ L bus are communicated in an event triggering mode, and the CAN _ H and the CAN _ L are output ends of a CAN control chip TJA1042T, wherein the state of a CAN _ H end CAN only be in a high level or a suspension state, and the state of a CAN _ L end CAN only be in a low level or a suspension state.

3. A fire fighting system for a dense storage site as recited in claim 2, wherein the switching power supply provides 24 volts to the power module.

4. A fire fighting system for a dense storage site as recited in claim 2, wherein the upper computer is a PC.

5. A fire fighting system for a dense storage place as defined in claim 2, wherein the fire extinguishing unit is a water spraying system, the fire extinguishing control module drives a stepping motor through a power chip, and a control water valve of a spraying device is opened to start fire extinguishing.

6. A fire protection system control method for a dense storage site implemented on the fire protection system of claim 2, characterized by the process of:

powering on a system, and carrying out initialization setting;