CN217238892U - Smoke fire detector smoke chamber detection circuit - Google Patents
Smoke fire detector smoke chamber detection circuit Download PDFInfo
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- CN217238892U CN217238892U CN202220654732.2U CN202220654732U CN217238892U CN 217238892 U CN217238892 U CN 217238892U CN 202220654732 U CN202220654732 U CN 202220654732U CN 217238892 U CN217238892 U CN 217238892U
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Abstract
The application discloses smoke fire detector smoke chamber detection circuit, which comprises a transmitting circuit and a receiving circuit, wherein the transmitting circuit comprises an infrared transmitting tube and a transistor, the receiving circuit comprises an infrared transmitting tube and an amplifier, the transmitting circuit and the receiving circuit are respectively connected with a control circuit, the control circuit sends a control signal to the transmitting circuit, and the infrared transmitting tube in the transmitting circuit transmits infrared rays outwards; the infrared receiving tube of the receiving circuit receives the infrared rays and sends a feedback signal to the control circuit after passing through the amplifier, and the control circuit judges the smoke content in the environment according to the intensity of the infrared rays received by the receiving circuit. The sensitivity of the sensor to black smoke is improved, the environment adaptability of the alarm is enhanced, and an effective fire detection alarm effect is achieved.
Description
Technical Field
The application relates to a fire alarm equipment circuit, in particular to a smoke sensing fire detector smoke chamber detection circuit.
Background
With the establishment and use of a large number of buildings, an automatic fire alarm system for ensuring personal and property safety becomes more and more necessary, and a detector in the automatic fire alarm system is used as a fire alarm component and has the function of converting fire parameters such as smoke, temperature and the like during fire into electric signals for intelligent judgment and transmitting the judgment result to a fire alarm controller through a transmission bus.
The detectors can be classified into smoke detectors, temperature detectors, and flame detectors.
During the initial stages of a fire, on the one hand, the substances release a large amount of heat during combustion and, on the other hand, a large amount of smoke is produced. The existing fire detection alarm equipment comprises a shell, a middle seat and a base, wherein a key and an alarm confirmation lamp light guide column are installed on the shell, a printed circuit board and a battery are installed on the middle seat, an electric control is arranged on the circuit board and comprises a CPU (central processing unit) processing circuit and a peripheral interface circuit, and the peripheral interface circuit consists of an acoustic signal driving circuit, a confirmation lamp circuit, a smoke detection circuit (namely a transmitting circuit and a receiving circuit), a test circuit, a battery voltage detection circuit and a power supply circuit; the receiving circuit, the testing circuit and the battery voltage detection circuit transmit related information to the CPU to finish the detection of fire alarm information, testing information and battery voltage information, the CPU controls the timely start of the sound-light alarm circuit according to each information condition, and the battery voltage detection circuit has the following defects: the infrared sensor device has very low sensitivity to black smoke, and often sends out an alarm signal in the later period after the fire happens in the fire which only generates black smoke. The application relates to a detector mainly uses in indoor environment, especially there are environment and the place that smoke fire detector should not be installed such as smog, steam delay and a large amount of dust in normal condition such as garage, kitchen, boiler room, tea stove room, generator room, stoving workshop, smoking room.
SUMMERY OF THE UTILITY MODEL
An aim at of this application provides a smoke detector smoke chamber detection circuit, has improved the sensitivity of sensor to black cigarette, and has strengthened the environmental suitability ability of alarm, plays effectual fire detection warning effect.
The technical scheme adopted by the application is as follows: the smoke fire detector smoke chamber detection circuit comprises a transmitting circuit and a receiving circuit, wherein the transmitting circuit comprises an infrared transmitting tube and a transistor, the receiving circuit comprises an infrared transmitting tube and an amplifier, the transmitting circuit and the receiving circuit are respectively connected with a control circuit, the control circuit sends a control signal to the transmitting circuit, and the infrared transmitting tube in the transmitting circuit transmits infrared rays outwards; the infrared receiving tube of the receiving circuit receives infrared rays and sends a feedback signal to the control circuit after passing through the amplifier, and the control circuit judges the smoke content in the environment according to the intensity of the infrared rays received by the receiving circuit.
Compared with the prior art, the advantage of this application lies in, this application is stand alone type smoke sensing fire detection circuit, and its infrared transmitting tube combines together with infrared receiving tube, has improved fire detection's sensitivity greatly. Particularly, a transistor is further applied to the transmitting circuit, and an amplifier is applied to the receiving circuit, so that the detection sensitivity of the detector for the fire of the black smoke fire is improved. And when the control circuit judges that the smoke content in the environment is higher and reaches a triggering alarm range value, the control circuit sends out an alarm signal and drives the acousto-optic alarm to work.
In some embodiments of the present application, the infrared emission tube is an infrared emission tube of model number LTE-4208. The infrared receiving tube is an infrared receiving tube with the model of LTR-323 DB. The fire detector has good fire detection sensitivity and can be applied in high-temperature environments.
In some embodiments of the present application, the transistor is a triode; specifically, the transistor is a transistor with the model of MMSTA28T 146.
Specifically, the base electrode of the triode is connected with the control circuit, the emitting electrode of the triode is grounded, and the collecting electrode of the triode is connected with the infrared emission tube.
More specifically, the base of the triode is connected with the control circuit through a thirteenth resistor, the emitter of the triode is grounded through a fifteenth resistor, and the base of the triode is connected with the emitter of the triode through a fourteenth resistor. The collector of the triode is connected with the cathode of the infrared emission tube.
In some embodiments of the present application, the transmitting circuit further includes a twelfth resistor, one end of the twelfth resistor is connected to the transmitting power source, and the other end of the twelfth resistor is connected to the anode of the infrared transmitting tube.
Specifically, the other end of the twelfth resistor is grounded through the seventh capacitor.
In some embodiments of the present application, the amplifier is an operational amplifier of type TLV 6001.
Specifically, a first pin of the amplifier is connected with the control circuit, a second pin of the amplifier is grounded, a fourth pin of the amplifier is connected with the negative electrode of the infrared receiving tube, a third pin of the amplifier is connected with the positive electrode of the infrared receiving tube, and a fifth pin of the amplifier is connected with the receiving power supply.
In some embodiments of the present application, the receiving circuit includes a sixteenth resistor and an eighteenth resistor, one end of the sixteenth resistor is connected to the receiving power supply, the other end of the sixteenth resistor is connected to one end of the eighteenth resistor, and the other end of the eighteenth resistor is connected to the third pin of the amplifier.
Specifically, one end of the sixteenth resistor is grounded through the ninth capacitor. One end of the eighteenth resistor is grounded through the twentieth resistor.
In some embodiments of the present application, the receiving circuit further includes a nineteenth resistor and an eighth capacitor, where the nineteenth resistor and the eighth capacitor are connected in parallel to form a component device group, one end of the component device group is connected to the fourth pin of the amplifier, the other end of the component device group is connected to the first pin of the amplifier through a seventeenth resistor, and the other end of the component device group is grounded through a twenty first resistor.
Drawings
The present application will be described in further detail below with reference to the drawings and preferred embodiments, but those skilled in the art will appreciate that the drawings are only drawn for the purpose of illustrating the preferred embodiments and therefore should not be taken as limiting the scope of the present application. Furthermore, unless specifically stated otherwise, the drawings are merely schematic representations based on conceptual representations of elements or structures depicted and may contain exaggerated displays and are not necessarily drawn to scale.
FIG. 1 is a transmit circuit of the present application;
fig. 2 shows a receiving circuit according to the present application.
Detailed Description
The present application will now be described in detail with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Smoke fire detector smoke chamber detection circuit, as shown in fig. 1-2: the infrared emission device comprises an emission circuit and a receiving circuit, wherein the emission circuit comprises an infrared emission tube L2 and a transistor, the receiving circuit comprises an infrared emission tube L2 and an amplifier IC2, the emission circuit and the receiving circuit are respectively connected with a control circuit, the control circuit sends a control signal to the emission circuit, and the infrared emission tube L2 in the emission circuit emits infrared rays outwards; the infrared receiving tube D4 of the receiving circuit receives infrared rays, and sends a feedback signal to the control circuit after passing through the amplifier IC2, and the control circuit judges the smoke content in the environment according to the intensity of the infrared rays received by the receiving circuit.
The infrared transmitting tube L2 adopts an infrared transmitting tube L2 with the model number of LTE-4208. The infrared receiving tube D4 is an infrared receiving tube D4 with the model number of LTR-323 DB. The fire detector has good fire detection sensitivity and can be applied in a high-temperature environment. This application is stand alone type smoke sensing fire detection circuit, and its infrared transmitting tube L2 combines together with infrared receiving tube D4, has improved fire detection's sensitivity greatly. Particularly, by further using a transistor in the transmission circuit and an amplifier IC2 in the reception circuit, the detection sensitivity of the detector for a fire such as a black smoke fire is improved. And when the control circuit judges that the smoke content in the environment is higher and reaches a triggering alarm range value, the control circuit sends out an alarm signal and drives the acousto-optic alarm to work.
As shown in fig. 1, the transistor is a transistor Q4; specifically, the transistor is a transistor Q4 of type MMSTA28T 146. Specifically, the base of the triode Q4 is connected with the control circuit, the emitter of the triode Q4 is grounded, and the collector of the triode Q4 is connected with the infrared emission tube L2. More specifically, the base of the triode Q4 is connected with the control circuit through a thirteenth resistor R13, the emitter of the triode Q4 is grounded through a fifteenth resistor R15, and the base and the emitter of the triode Q4 are connected through a fourteenth resistor R14. The collector of the triode Q4 is connected with the negative electrode of the infrared emission tube L2.
The transmitting circuit further comprises a twelfth resistor R12, one end of the twelfth resistor R12 is connected with a transmitting power supply, and the other end of the twelfth resistor R12 is connected with the anode of the infrared transmitting tube L2. Specifically, the other end of the twelfth resistor R12 is grounded through the seventh capacitor C7.
As shown in fig. 2, the amplifier IC2 is an operational amplifier IC2 with a model number TLV 6001. Specifically, a first pin of the amplifier IC2 is connected to the control circuit, a second pin of the amplifier IC2 is grounded, a fourth pin of the amplifier IC2 is connected to the negative electrode of the infrared receiving tube D4, a third pin of the amplifier IC2 is connected to the positive electrode of the infrared receiving tube D4, and a fifth pin of the amplifier IC2 is connected to the receiving power supply.
The receiving circuit comprises a sixteenth resistor R16 and an eighteenth resistor R18, one end of the sixteenth resistor R16 is connected with a receiving power supply, the other end of the sixteenth resistor R16 is connected with one end of an eighteenth resistor R18, and the other end of the eighteenth resistor R18 is connected with a third pin of the amplifier IC 2. Specifically, one end of the sixteenth resistor R16 is grounded through the ninth capacitor C9. One end of the eighteenth resistor R18 is grounded through the twentieth resistor R20. The receiving circuit further comprises a nineteenth resistor R19 and an eighth capacitor C8, the nineteenth resistor R19 and the eighth capacitor C8 are connected in parallel to form a component device group, one end of the component device group is connected with a fourth pin of the amplifier IC2, the other end of the component device group is connected with a first pin of the amplifier IC2 through a seventeenth resistor R17, and the other end of the component device group is grounded through a twenty first resistor R21.
The scheme of the application is applied to the detection alarm specifically: the control circuit comprises a CPU processing circuit and a peripheral interface circuit, the peripheral interface circuit comprises a voltage-stabilized power supply circuit, a battery voltage detection circuit, an acoustic signal driving circuit, a test circuit, a confirmation lamp circuit and a smoke chamber detection circuit of the smoke fire detector, and each peripheral interface circuit is electrically connected with the CPU processing circuit.
The power supply of the whole detection alarm is provided by a voltage stabilizing power supply circuit, after the system runs, the CPU automatically detects the state, when the condition that a person is a test signal or fire alarm information is detected, the CPU enters the system test state or the fire alarm state, the test state or the fire alarm state is released and then automatically enters the dormant state, if the person is not the test signal or the fire alarm information is not detected, the CPU directly enters the dormant state, the CPU is awakened by a timer after preset time and then enters the detection state again, and the operation is repeated and circulated.
When a certain amount of smoke is increased and reaches or exceeds an alarm threshold value, the CPU starts the sound signal driving circuit device to generate oscillation frequency to drive the integrated buzzer resonant cavity to send out an alarm signal, and simultaneously drives the alarm confirmation lamp circuit device to send out a fire alarm light signal. The battery voltage detection circuit device provides battery electric quantity information for the CPU, the CPU distinguishes whether the battery meets the use requirement or not according to the battery electric quantity information, and the CPU drives the acoustic signal driving circuit device to send out a fault acoustic signal when the electric quantity is low so as to prompt a user to replace the battery.
When the detection alarm works normally, the test key is pressed to start the test signal detection circuit, and the CPU receives the detection information and controls the sound signal driving circuit device and the fire alarm confirmation lamp circuit device to send out sound and light alarm signals like a fire alarm, so that the detector is in a normal operation state, otherwise, the detector is in a fault in operation.
The present application has been described in detail above, and specific examples thereof are used herein to explain the principles and implementations of the present application, which are presented solely to aid in understanding the present application and its core concepts. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.
Claims (10)
1. The smoke fire detector smoke chamber detection circuit is characterized by comprising a transmitting circuit and a receiving circuit, wherein the transmitting circuit comprises an infrared transmitting tube and a transistor, the receiving circuit comprises an infrared transmitting tube and an amplifier, the transmitting circuit and the receiving circuit are respectively connected with a control circuit, the control circuit sends a control signal to the transmitting circuit, and the infrared transmitting tube in the transmitting circuit transmits infrared rays outwards; the infrared receiving tube of the receiving circuit receives infrared rays and sends a feedback signal to the control circuit after passing through the amplifier, and the control circuit judges the smoke content in the environment according to the intensity of the infrared rays received by the receiving circuit.
2. The smoke-sensing fire detector smoke chamber detection circuit of claim 1, wherein the infrared transmitting tube is an infrared transmitting tube of type LTE-4208; the infrared receiving tube is an infrared receiving tube with the model number of LTR-323 DB.
3. The smoke fire detector chamber detection circuit of claim 1, wherein the transistor is a triode; the transistor is a triode with the model of MMSTA28T 146.
4. The smoke-sensing fire detector smoke chamber detection circuit of claim 3, wherein a base of the triode is connected to the control circuit, an emitter of the triode is grounded, and a collector of the triode is connected to the infrared emission tube.
5. The smoke-sensing fire detector smoke chamber detection circuit as claimed in claim 4, wherein the base of said triode is connected with the control circuit through a thirteenth resistor, the emitter of said triode is grounded through a fifteenth resistor, and the base and the emitter of said triode are connected through a fourteenth resistor; the collector of the triode is connected with the cathode of the infrared emission tube.
6. The smoke fire detector smoke chamber detection circuit of claim 1 or 5, wherein the emission circuit further comprises a twelfth resistor, one end of the twelfth resistor is connected with the emission power supply, and the other end of the twelfth resistor is connected with the anode of the infrared emission tube; the other end of the twelfth resistor is grounded through the seventh capacitor.
7. The smoke detector smoke chamber detection circuit of claim 1, wherein the amplifier is an operational amplifier of type TLV 6001.
8. The smoke fire detector smoke chamber detection circuit of claim 7, wherein a first pin of the amplifier is connected to the control circuit, a second pin of the amplifier is grounded, a fourth pin of the amplifier is connected to a negative electrode of the infrared receiving tube, a third pin of the amplifier is connected to a positive electrode of the infrared receiving tube, and a fifth pin of the amplifier is connected to a receiving power supply.
9. The smoke sensing fire detector smoke chamber detection circuit of claim 7 or 8, wherein the receiving circuit comprises a sixteenth resistor and an eighteenth resistor, one end of the sixteenth resistor is connected with a receiving power supply, the other end of the sixteenth resistor is connected with one end of the eighteenth resistor, and the other end of the eighteenth resistor is connected with a third pin of the amplifier; one end of the sixteenth resistor is grounded through the ninth capacitor; one end of the eighteenth resistor is grounded through the twentieth resistor.
10. The smoke detector smoke chamber detection circuit of claim 9, wherein the receiving circuit further comprises a nineteenth resistor and an eighth capacitor, the nineteenth resistor and the eighth capacitor are connected in parallel to form a component device group, one end of the component device group is connected to the fourth pin of the amplifier, the other end of the component device group is connected to the first pin of the amplifier through a seventeenth resistor, and the other end of the component device group is grounded through a twenty first resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220654732.2U CN217238892U (en) | 2022-03-24 | 2022-03-24 | Smoke fire detector smoke chamber detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220654732.2U CN217238892U (en) | 2022-03-24 | 2022-03-24 | Smoke fire detector smoke chamber detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217238892U true CN217238892U (en) | 2022-08-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220654732.2U Active CN217238892U (en) | 2022-03-24 | 2022-03-24 | Smoke fire detector smoke chamber detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217238892U (en) |
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2022
- 2022-03-24 CN CN202220654732.2U patent/CN217238892U/en active Active
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