SU978170A2

SU978170A2 - Smoke sensor

Info

Publication number: SU978170A2
Application number: SU782633751A
Authority: SU
Inventors: Владимир Васильевич Голяшкин; Сергей Валентинович Блохин; Надежда Алексеевна Чевтайкина
Priority date: 1978-06-23
Filing date: 1978-06-23
Publication date: 1982-11-30

Description

Изобретение относитс к сигнал задии и может быть использовано дл обнаружени взвешенных частиц дыма, пыли в окружающей среде, н апример , как сигнализатор пожара в багажниках и грузовых отсеках воздушных судов.The invention relates to a rear signal and can be used to detect suspended particles of smoke, dust in the environment, for example, as a fire alarm in luggage and cargo hold of aircraft.

По основному авт.св. №736149 известен датчик дыма, содержащий источник света, оптически св занный с фотоэлементами, один из котор&лх расположен на одной оси с источником света и подключен к входу одного усилител , а другой фотоэлемент под углом к источнику света и соединен с входом другого усилител , дополнительный источник света, расположенный на одной оси с другим фотоэлементом , коммутирующий блок, выход которого подключен к дополнительному источнику .света, к выходу одного , усилител подключен первый вход блока вычитани , к выходу другого усилител подключен второй вход блока вычитани и вход порогового блока, выход блока вычитани непосредственно и через инвертор подключен соответственно к первому и второму входу ключа, третий вход ключа и вход коммутирующего блока соединеныAccording to the main auth. No. 736149 a smoke sensor is known that contains a light source optically coupled to photocells, one of which is located on the same axis as the light source and connected to the input of one amplifier, and the other photocell at an angle to the light source and connected to the input of another amplifier, additional light source located on the same axis with another photocell, switching unit, the output of which is connected to an additional light source, to the output of one amplifier, the first input of the subtractor is connected, to the output of the other amplifier key of the second input of subtractor block and a threshold input unit, output of subtractor unit directly and via inverter is connected to first and second input key, the third key input, and the input of the switching unit are connected

с выходом порогового блока, выход, ключа подключен к выходному реле, второй выход коммутирующего блока подключен к источнику П.with the output of the threshold unit, the output key is connected to the output relay, the second output of the switching unit is connected to the source P.

Однако данное устройство имеет недостаток, заключающийс в, отсутствии средств контрол работоспособности датчика.However, this device has the disadvantage of not having a means of monitoring the operability of the sensor.

Цель изобретени - повышение The purpose of the invention is to increase

10 надежности устройства.10 device reliability.

Поставленна цель достигаетс тем, что в датчик дыма введены блок контрол , содержащий два резистора и переключатель, первый резистор The goal is achieved by introducing into the smoke sensor a control unit containing two resistors and a switch, the first resistor

15 блока контрол включен последовательно в цепь источника света, параллельно первому резистору подсоединен размыкающий контакт переключател , последовательно соединенные . 15 of the control unit is connected in series to the light source circuit, a break contact of the switch connected in series is connected in parallel with the first resistor.

20 второй резистор и замыкающий контакт переключател соединены последовательно и подсоединены к первому и второму выходам ключевого блока.20, the second resistor and the switching contact of the switch are connected in series and connected to the first and second outputs of the key block.

На чертеже изображен датчик дыма.The drawing shows a smoke detector.

2525

Датчик дыма содержит источник 1 света, фотоэлементы 2 и 3, дополнительный источник 4 света, блок 5 вычитани , усилители 6 и 7, ключ 8, инвертор 9, выходное реле Ю, The smoke sensor contains light source 1, photocells 2 and 3, additional light source 4, block 5 subtraction, amplifiers 6 and 7, key 8, inverter 9, output relay Yu,

Claims

30, a threshold unit 11, a switching unit 12, an additional switching unit 13, made on the switch 14 and resistors 15 and 16, the switch 14 has a disconnecting contact 17 and a green contact 18. The smoke sensor works the next time. In the initial state, the light source 1 is turned on and its luminous flux falls on the photocell 2, the photo cell, ment 3 is shaded, and the light source 4 is turned off. At the output of the subtraction unit 5, the signal level is proportional to the difference in signal levels at the outputs of amplifiers b and 7, for example positive polarity. Key 8 is open at the input connected to the output of subtraction unit 5 and closed at the input connected to inverter 9. Relay 10, which is set to the negative polarity threshold, is turned off. When a smoke sensor enters the camera's volume, the signal levels at the outputs of amplifiers b and 7 change from, changes accordingly and their difference at the output of block 5, when the signal at the output of switch 8 reaches the trigger threshold, Ral 10 activates the fire alarm. Then, as the concentration of smoke in the sensor chamber increases, the signal level at the output of amplifier b reaches the threshold of threshold unit 11, which, triggered and self-blocking, sends a signal to the input of switching unit 12 and to the control input of key 8. The switching unit 12 turns off the source 1 is sung and includes 4 light sources, and the key 8 connects -relay 10 to the output of the inverter 9. At the same time, the signal levels. from the outputs of amplifiers b and 7, the polarity of their differences at the output of subtractor 5 changes in a jumpy manner, but due to switching the input of the key 8 to the inverter 9, the polarity of the signal of the control relay 10 does not change. The sensor is tested by pressing switch 14. At the same time, the resistor 15 is connected to the source of light 1 and the light source 4 is connected to the second output of the switching unit 12 via series-connected resistor 16 and an optical contact 16. The light source 4 is turned on ; light flow. The size of resistors 15 and 16 is chosen in such a way that when sources 1 and 4 of light are turned on through them, photo cells 2 and 3 supply light fluxes that correspond to the conditions of smoke entering the sensor chamber during a fire. If the smoke sensor is operational at the time of monitoring, then, as in the case of a fire, the output relay 10 trips. In case of any malfunction that leads to the loss of the smoke detector's working capacity, the output relay 10 does not operate when tested. Ensuring that the smoke sensor is working properly allows you to improve the operational reliability of the sensor and, in relation to aviation, ultimately increase the safety and regularity of flights of air transport ships. Claims of the invention Smoke sensor according to author. 736149, characterized in that, in order to increase the reliability of the device, a control unit containing two resistors and a switch are inserted into it, the first resistor of the control unit is connected in series to the light source circuit, a break contact of the switch connected in series, a second resistor connected in series and a short circuit the switch contact is connected in series and connected respectively to the first and second outputs of the key block. Sources of information taken into account in the examination 1. USSR author's certificate I No. 736149 according to application No. 2540114 / 18-24, 03.11.77.