WO2016116024A1

WO2016116024A1 - Point-type active smoke detector with or without gas sampling tube and air sampling system

Info

Publication number: WO2016116024A1
Application number: PCT/CN2016/071249
Authority: WO
Inventors: 赵康柱; 薛战华; 魏辉宇; 莫崇典
Original assignee: 西安博康电子有限公司
Priority date: 2015-01-20
Filing date: 2016-01-18
Publication date: 2016-07-28
Also published as: CN104574776A; CN105374154A; CN105374154B

Abstract

A point-type active smoke detector with or without a gas sampling tube (08) and an air sampling system are disclosed. The detector comprises a main control board (25), a monitoring cavity (23), a sensor (24) composed of a photoemissive tube and a receiving tube, and an air-pumping device. The monitoring cavity (23) is provided with a gas inlet and a gas outlet. The gas inlet on the monitoring cavity (23) is opposite directly to the gas outlet and the gas passing through the monitoring cavity (23) passes a crossing area of two beams between the photoemissive tube and the receiving tube. The point-type active smoke detector, the point-type active smoke detector with a gas sampling tube (08) and the air sampling system can shorten the alarm monitoring time for fire detection and the photoemissive tube and receiving tube can be flexibly arranged; and all these can reduce the cost of the traditional air sampling system.

Description

Point-type active smoke detector with or without gas collection pipe and air sampling system

Technical field

The invention belongs to the technical field of fire fighting equipment, and particularly relates to a point type active smoke detector and an air sampling system with or without a gas collecting pipe.

Background technique

In the fire protection industry, the working principle of the point type smoke detector currently used is that when the soot particles diffuse into the monitoring chamber, thereby scattering the infrared light emitted by the infrared light emitting tube in the monitoring chamber, the infrared receiving tube receives Infrared light, then the main control board (or signal processing unit) outputs an alarm signal through analysis and judgment. Since the detector relies on the convection of air to diffuse the soot particles into the monitoring chamber, it takes a certain time for the smoke to be diffused into the monitoring chamber from the initial stage of the fire, so that the fire cannot be timely monitored and alarmed; Under normal monitoring conditions, not only dust is present in the monitoring chamber for a long time, but also the dust particles will diffuse and reside in the monitoring chamber during the fire, which greatly affects the sensitivity and real-time performance of the detector.

An active aspirating point type photo-electricity smoke detector is disclosed in Chinese Patent No. 201310006786.3, which includes an air pump 27, a monitoring chamber 23, a filter layer 2 with an optical labyrinth, and a signal processing unit, as shown in FIG. 5; an infrared light-emitting tube and a receiving tube 4 are disposed in the monitoring chamber 23; a filter layer 2 with an optical labyrinth is disposed at the air inlet and the air outlet of the monitoring chamber 23; and the air pump 27 is disposed at the air outlet filter layer 2 of the monitoring chamber 23. On the outside, it accelerates the airflow in the monitoring chamber 23 by externally ventilating, and the airflow passage is: the side of the bottom of the detector - the inlet filter layer 2 - the monitoring chamber 23 - the outlet filter layer 2 - the suction pump 27 - the top of the detector The disadvantage of this type of detector is that the false alarm rate is high, and it is necessary to adopt the filter layer 2 with the optical labyrinth to prevent external light from entering the monitoring chamber 23, and to prevent the entry of small insects and large particles; The air flow passage must pass through the intersection of the infrared light pipe provided in the monitoring chamber 23 and the two optical axes of the receiving pipe 4, and in the event of a fire, the smoke must rise from the space and spread to the ceiling, that is, the bottom of the detector, and finally can enter. Vent Monitoring layer 2 into the chamber 23.

An anti-false alarm fire smoke detector is disclosed in Chinese Utility Model Patent No. 98241806.X, as shown in FIG. 2, The utility model mainly comprises a smoke detector 3, an air inlet filter chamber 1, an intake pipe 12, an electromagnetic pump 7, an exhaust hole 9, a sealed chamber 11 disposed outside the smoke detector 3, and a power source, and the smoke detector 3 The intake portion is provided with an intake filter chamber 1 and an electromagnetic pump 7 and an intake pipe 12 connected between the filter chamber 1 and the electromagnetic pump 7, and an exhaust hole with an air partition is provided at an air outlet portion of the smoke detector 3 9. In order to prevent the electromagnetic pump 7 from being sent to the smoke detector 3 through the filter chamber 1 due to poor sealing, the sealed chamber 11 must be in the intake portion of the smoke detector 3, the electromagnetic pump portion and its connection control alarm portion. The outer portion is formed as a sealed casing, and in order to prevent backflow of the gas discharged from the smoke detector 3, a partition must be provided between the intake and exhaust of the smoke detector 3. In addition, in order to ensure that the airflow has a certain pressure when passing through the filter chamber 1 and its length of the intake pipe 12, it is necessary to use an electromagnetic pump 7 having a small flow rate and low efficiency, even if only dust particles of 10 μm or more can be filtered out. In addition, in order to ensure normal operation, such a detector not only requires high sealing performance of the sealed chamber 11, but also has a complicated overall structure and high cost.

Summary of the invention

In order to solve the complicated design and strict requirements of the above-mentioned point type active smoke detector, the object of the present invention is to provide a point type active smoke detector with or without a gas collecting pipe and air sampling without being limited by the installation position. system.

In order to achieve the above object, the point type active smoke detector provided by the present invention mainly comprises a main control board, a monitoring chamber, a sensor disposed in the monitoring chamber and composed of a photo transmitting tube and a receiving tube, and is connected to the monitoring chamber and capable of The air in the detection area is drawn into the air suction device in the monitoring chamber, and the monitoring chamber is provided with a gas inlet and outlet; the gas inlet on the monitoring chamber is directly opposite to the gas outlet, and the airflow passing through the monitoring chamber passes through the The intersection of the two beams between the phototransmission tube and the receiving tube.

The photo-emitting tube and the receiving tube are respectively an infrared light emitting tube and a receiving tube, or a laser emitting tube and a receiving tube respectively of red light, blue light or green light.

The angle between the central axes of the two beams between the photo-emitting tube and the receiving tube is greater than 0 degrees and less than 180 degrees.

The airflow passing through the monitoring chamber is perpendicular or parallel to a plane in which the central axes of the two beams between the photo transmitting tube and the receiving tube are located.

The point type active smoke detector further includes a gas sensor or/and a temperature sensor.

The gas sensor is a carbon monoxide, sulfur dioxide, carbon dioxide, ammonia, hydrogen sulfide or nitrogen oxide gas sensor.

The air suction device is an air pump or a ventilation channel disposed at a gas inlet or a gas outlet of the monitoring chamber.

The air pump is a variable speed micro centrifugal or axial fan or a micro vacuum pump.

The point type active smoke detector further includes a filter unit disposed at a gas inlet on the monitoring chamber.

The filter layer in the filter unit is made of air filter paper or polypropylene non-woven material.

The point type active smoke detector further includes an air speed sensor disposed on a gas path passing through the airflow through the monitoring chamber.

The wind speed sensor uses a platinum resistance, a 锗 thermistor or an ultrasonic wind speed sensor.

The invention provides a point type active smoke detector with a gas collecting pipe. The point type active smoke detector with a gas collecting pipe mainly comprises a monitoring chamber with gas inlet and outlet, a photoelectric sensor composed of a photoelectric transmitting tube and a receiving tube, and a main control. a main plate and a photoelectric sensor are disposed in the monitoring cavity, and the airflow sucked into the monitoring cavity from the gas inlet passes through the intersection of the two beams between the phototransmission tube and the receiving tube on the photoelectric sensor, the main control board and the photoelectric sensor The electrical connection is used for detecting the change of the electrical parameter of the sensor and judging and outputting the fault or fire alarm signal; and providing a pumping device at the gas outlet of the monitoring chamber; the point type active smoke detector with the gas collecting pipe further comprises A gas production line connected to the gas inlet of the monitoring chamber and having a gas collection point or orifice.

The gas production pipeline is a gas production pipe or a gas production pipe network.

The photoelectric sensor is an infrared sensor composed of an infrared emitting tube and a receiving tube, or a laser sensor composed of a laser emitting tube and a receiving tube of a red, blue or green light source, or the above-mentioned infrared sensor or laser sensor and gas sensor a combination of at least one of the temperature sensors.

The air sampling system of the point type active smoke detector with the gas collecting pipe provided by the invention mainly comprises at least one sampling pipe, a casing, an air suction bellows and an exhaust fan installed therein, a gas collecting pipe, a laser sensor and a laser a laser sensing unit, a system operation unit and a display unit formed by the monitoring chamber; wherein the air suction bellows and the laser sensing unit are disposed in the chassis; one end of the sampling tube is connected to the air inlet of the air suction bellows through the chassis, and the air suction bellows is Side exhaust through the gas collection tube and laser The gas inlets of the sensing unit are connected; the system operation control unit and the display unit are disposed on the chassis; the laser sensing unit is capable of providing a monitoring chamber for gas inlet and outlet in the point type active smoke detector A photoelectric sensing unit is disposed in the monitoring chamber and is composed of a photoelectric sensor composed of a photo-emitting tube and a receiving tube, and the gas inlet of the monitoring chamber is connected to the gas collecting tube.

An air pump is installed at the gas outlet of the monitoring chamber.

The air sampling system of the point type active smoke detector with the gas collecting pipe mainly comprises a casing, at least one set of point type active smoke detectors with a gas collecting pipe, a centralized operation control unit and a display unit; wherein the point type active sense The smoke detector comprises a monitoring chamber with gas inlet and outlet, a photoelectric sensor composed of a photoelectric transmitting tube and a receiving tube, a main control board and a gas collecting tube; wherein the photoelectric sensor is disposed in the monitoring chamber and is sucked into the monitoring chamber from the gas inlet. The airflow passes through the intersection of the two beams between the photoelectric transmitting tube and the receiving tube on the photoelectric sensor, and the main control board is electrically connected with the photoelectric sensor; one end of the gas collecting pipe runs through the chassis and is connected to the gas inlet of the monitoring chamber; the centralized operation control unit and the display The unit is mounted on the chassis; an air pump is arranged at the gas outlet of the monitoring chamber.

The pump for installing the gas outlet of the monitoring chamber on the at least one set of point type active smoke detectors in the air sampling system can be replaced by a total pumping device, and the gas outlets on each monitoring chamber are connected at the total The total suction line of the suction device.

The point type active smoke detector provided by the invention can directly draw the gas in the detection area into the monitoring chamber from the gas inlet on the monitoring chamber, so that the alarm monitoring time of the fire detection can be shortened, and the smoke or dust particles are difficult to station. It stays on the inner wall of the monitoring chamber and has a no-cleaning effect, and the phototransmission tube and the receiving tube can be flexibly set without requiring it to be perpendicular to the detector chassis; in addition, the filter layer disposed at the gas inlet of the monitoring chamber can not only be very It is easy to solve the problem of false alarms in the dusty environment, and reduce the influence of external light on the sensors in the monitoring cavity; especially the increased wind speed sensor can monitor the problem of dust blockage in the high-temperature environment of the detector for a long time, and A filter unit replacement reminder message may be issued, which may be installed on the air suction duct or its branch pipe as a flue detector, or may be used as a point type active smoke detector independently by using an air pump.

The point type active smoke detector with the gas collecting pipe provided by the invention installs the gas collecting pipe at the gas inlet of the monitoring chamber of the point type active smoke detector, so that the monitoring cavity can be installed at any position on the site, and only needs to be different Length or different shape The gas production pipe is laid according to the structure of the on-site building. As long as the position of the gas production hole on the gas production pipe can meet the fire detection requirements, the complexity of the detector during engineering design can be greatly reduced, and the site installation adjustment point type initiative The smoke detector and its gas collection pipe and gas collection hole are conveniently located. In addition, regardless of the air sampling system of the photoelectric sensing unit in the point type active smoke detector with the gas collecting pipe, or the air sampling system composed of multiple sets of point type active smoke detectors with the gas collecting pipe, the air sampling system can be greatly reduced. The cost of a traditional air sampling system.

DRAWINGS

FIG. 1 is a schematic structural view of a prior art active aspirating point type photosensor smoke detector.

2 is a schematic structural view of a prior art anti-false alarm fire detector.

3 is a front cross-sectional view showing the structure of a point type active smoke detector according to Embodiment 1 of the present invention when the suction airflow is perpendicular to a plane in which the center axes of the two beams of the transmitting tube and the receiving tube are perpendicular.

4 is a transverse cross-sectional view of the point type active smoke detector shown in FIG.

FIG. 5 is a front cross-sectional view showing the structure of the point type active smoke detector according to Embodiment 2 of the present invention when the suction airflow is parallel to the plane where the central axes of the two beams of the launch tube and the receiving tube are located.

Figure 6 is a transverse cross-sectional view of the point type active smoke detector shown in Figure 5.

Figure 7 is a front cross-sectional view showing the structure of a point type active smoke detector with an air pump according to Embodiment 3 of the present invention.

8 is a front cross-sectional view showing the structure of a point type active smoke detector with a filter unit according to Embodiment 4 of the present invention.

Figure 9 is a front cross-sectional view showing the structure of a point type active smoke detector with a wind speed sensor according to a fifth embodiment of the present invention.

FIG. 10 is a schematic structural view of a point type active smoke detector with a gas collecting pipe according to Embodiment 6 of the present invention.

FIG. 11 is another schematic structural view of a point type active smoke detector with a gas collecting pipe according to Embodiment 6 of the present invention.

12 is a schematic structural view of an air sampling system using a point type active smoke detector with a gas collecting pipe according to Embodiment 7 of the present invention.

FIG. 13 is another schematic structural diagram of an air sampling system using a point type active smoke detector with a gas collecting pipe according to Embodiment 7 of the present invention.

14 is a schematic structural view of an air sampling system using a three-point active smoke detector with a gas collection pipe according to Embodiment 8 of the present invention.

FIG. 15 is another schematic structural diagram of an air sampling system using a three-point active smoke detector with a gas collection pipe according to Embodiment 8 of the present invention.

detailed description

The point type active smoke detector and the air sampling system provided with or without the gas collecting pipe provided by the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The same components as the prior art are given the same reference numerals.

Example 1:

As shown in FIG. 3 and FIG. 4, the point type active smoke detector provided by the embodiment (taking infrared light smoke as an example) includes a monitoring chamber 23 having gas inlet and outlet, and an infrared emitting tube and a receiving tube. The sensor 24 and the main control board 25; wherein the sensor 24 is disposed in the monitoring chamber 23, and the airflow drawn into the monitoring chamber 23 from the gas inlet passes through the intersection of the two beams between the infrared transmitting tube and the receiving tube on the sensor 24, the main control board 25 is electrically connected to the sensor 24 for detecting changes in the electrical parameters of the sensor and for determining and outputting a fault or fire alarm signal.

Description: The two beams between the infrared transmitting tube and the receiving tube are actually a cone-shaped light emitted from the transmitting tube as a starting point for the transmitting tube, and the receiving tube is the starting point for the receiving tube. A bundle of virtual light received in the shape of a cone. The central axes of the two beams between the infrared emitting tube and the receiving tube refer to the central axes of the above two cones.

In this embodiment, the gas inlet and outlet are respectively located at the top surface and the bottom surface of the monitoring chamber 23, in this case, the air flow in the suction monitoring chamber 23 indicated by the arrow and the infrared emission tube and the receiving tube on the sensor 24. The plane in which the central axes of the two beams are located is perpendicular.

The main control board 25 in this embodiment is horizontally disposed in the lower part of the monitoring chamber 23, in this case, in order to enable the above-mentioned suction airflow to be concentrated vertically through the two beam centers between the infrared transmitting tube and the receiving tube on the sensor 24. The plane where the axis is located, and the intersection of the two beams passing between the infrared transmitting tube and the receiving tube on the sensor 24, need to be opened in the middle of the main control board 25; of course, the main control board 25 can also be installed without obstructing airflow. The monitoring chamber 23 passes through any portion of the intersection of the two beams between the infrared emitting tube and the receiving tube on the sensor 24, such as outside the monitoring chamber 23.

The main control board 25 (also referred to as a signal processing unit) includes a microprocessor, a photoelectric conversion unit, and a signal output unit; wherein:

The microprocessor is used for analog-to-digital conversion of the smoke signal of the photoelectric conversion unit, and then analyzed, judged, and controls the alarm device and the indicator light to emit an audible and visual alarm signal when the fire is determined, and simultaneously sends the signal to the signal output unit and the external control unit. Output control signal;

The photoelectric conversion unit has one end connected to the smoke sensor and the other end connected to the microprocessor through the signal amplifying unit, and is used for converting the smoke light signal detected by the smoke sensor into a current signal, and then amplified by the signal amplification unit and then transmitted to the microprocessor;

The signal output unit has one end connected to the microprocessor and the other end connected to the fire alarm system through a bus or a multi-wire, and transmits an alarm signal and an alarm position to the fire alarm system in the event of a fire.

The point type active smoke detector provided in this embodiment is generally installed on the air duct main pipe or its branch pipe, and can be used as a air duct point type detector or a distributed point type detector. When the point type active smoke detector is installed on the main channel of the air passage or the branch pipe thereof, the external air is sucked by the air duct fan, and the gas passes through the gas inlet of the point type active smoke detector. The interior of the chamber 23 is monitored and then passed through the sensor 24 before being discharged from the gas outlet. Once the sensor 24 fails or smoke particles appear in the external ambient gas, the main control board 25 connected to the sensor 24 detects an abnormal change in the electrical parameters of the sensor 24, so that it can immediately determine that the sensor 24 is malfunctioning or has a fire, thereby Output a fault or fire alarm signal.

The sensor 24 may be an infrared sensor composed of an infrared emitting tube and a receiving tube, or a laser sensor composed of a laser emitting tube and a receiving tube of a red, blue or green light source, or the above-mentioned infrared sensor or laser sensor. Combined with at least one of a gas sensor and a temperature sensor.

Example 2

As shown in FIG. 5 and FIG. 6 , the point type active smoke detector provided by the embodiment (taking infrared light smoke as an example) includes a monitoring chamber 23 having gas inlet and outlet, and an infrared emitting tube and a receiving tube. The sensor 24 and the main control board 25; wherein the sensor 24 is disposed in the monitoring chamber 23, and the airflow drawn into the monitoring chamber 23 from the gas inlet passes through the intersection of the two beams between the infrared transmitting tube and the receiving tube on the sensor 24, the main control board 25 is electrically connected to the sensor 24 for detecting the sensing The electrical parameters change and judge and output a fault or fire alarm signal.

In this embodiment, the gas inlet and outlet are respectively located on opposite sides of the monitoring chamber 23, in this case, the airflow in the suction monitoring chamber 23 indicated by the arrow and the infrared transmitting tube and the receiving tube on the sensor 24. The plane between the central axes of the two beams is parallel.

The main control board 25 can be horizontally disposed in the lower part of the monitoring chamber 23 in the manner shown in FIG. 5 and FIG. 6, so as to be parallel to the plane of the central axes of the two beams between the infrared transmitting tube and the receiving tube on the sensor 24; The arrangement shown in FIG. 3; as long as the main control board 25 is installed in any part of the monitoring chamber 23, it does not hinder the airflow from passing through the monitoring chamber 23 and passes through the two-beam intersection area between the infrared transmitting tube and the receiving tube on the sensor 24. can.

The point type active smoke detector provided in this embodiment is generally installed on the air duct main pipe or its branch pipe as in the first embodiment, and can be used as a duct point type detector or a distributed point type detector. The working process and alarm principle are the same as those in Embodiment 1, and therefore will not be repeated here.

Example 3

In order to make the point type active smoke detector provided in

Embodiment

1 or 2 not only be applied to the air duct main pipe or its branch pipe, but can be used alone, as shown in FIG. 7, the point type active smoke is provided in this embodiment. The detector is based on the point type active smoke detector provided in

Embodiment

1 or 2, and an air pump 27 is added at the inlet or outlet of the monitoring chamber 23, and the air pump 27 is electrically connected to the main control board 25, and the like. The part is the same as that of

Embodiment

1 or 2.

The point type active smoke detector provided in this embodiment may be disposed in a fireproof area or a fire danger area, and the external environment gas in the area may be directly inhaled into the monitoring chamber 23 through the gas inlet on the monitoring chamber 23 by using the air pump 27. The interior is then passed through sensor 24 and then discharged from the gas outlet. Once the sensor 24 fails or smoke particles appear in the external ambient gas, the main control board 25 connected to the sensor 24 detects an abnormal change in the electrical parameters of the sensor 24 due to This can immediately determine that the sensor 24 is malfunctioning or has a fire, thereby outputting a fault or fire alarm signal.

Example 4

Although the point type active smoke detector provided in the above Embodiment 1-3 can be applied to a clean place or a general environment place, it can actively inhale the external environment gas in the detection area into the monitoring chamber 23 and detect it in time, thereby greatly shortening The detection time of the detector to the external ambient gas in the detection area, but if the above detector is applied to a bad place such as dust, the point type active smoke detector may have a false alarm or no alarm problem. .

In order to solve the problem, as shown in FIG. 8, the point type active smoke detector provided in this embodiment is disposed at the gas inlet of the monitoring chamber 23 on the point type active smoke detector described in Embodiment 1-3. The filter unit 21 for filtering dust is the same as the other portions of the embodiment 1-3.

The filtering unit 21 can select different types according to the particle size of the detector monitoring substance, for example, the filter layer adopts an air filter paper or a polypropylene non-woven filter.

Example 5

In order to prevent the point type active smoke detector provided in the embodiment 4 from being clogging in the filter layer on the filter unit 21 due to excessive dust during long-term operation, the detector cannot detect the alarm in time, so it is necessary to promptly remind the maintenance personnel. The problem of replacement or cleaning is as shown in FIG. 9. The point type active smoke detector provided in this embodiment is the gas in front of or behind the air pump 27 of the point type active smoke detector described in Embodiment 4. The wind speed sensor 26 is added to the road, and the wind speed sensor 26 is electrically connected to the main control board 25, and the other portions are the same as those of the fourth embodiment.

The wind speed sensor 26 is a type of wind speed sensor such as a platinum resistor, a tantalum thermistor or an ultrasonic wave.

The air pump 27 is a variable speed micro centrifugal or axial fan or a micro vacuum pump air pump, which can increase the rotational speed as the degree of clogging of the filter layer is gradually increased.

Under normal circumstances, the point type active smoke detector provided in this embodiment is disposed in the detection area, and directly uses the air pump 27 to pump the external environment gas in the detection area through the filter unit 21 at the gas inlet of the monitoring chamber 23. And then passing through the sensor 24, the wind speed sensor 26 disposed on the air path will monitor the airflow size in real time; when the main control board 25 detects that the electrical parameter of the sensor 24 reaches the fire alarm threshold, it outputs a fire alarm signal; when the main control board 25 detects the sensor 24. When any of the wind speed sensor 26 and the air pump 27 fails, the main control board 25 outputs a failure signal.

When the main control board 25 detects that the monitored air flow of the wind speed sensor 26 is less than a certain degree, and the sensor 24 and the air pump 27 do not malfunction, the main control board 25 controls the air pump 27 to adjust the speed or directly sends the filter unit 21 to block the information; If the main control board 25 directly or indirectly controls the air pump 27 to adjust the airflow speed of the wind speed sensor 26, the monitoring airflow can still be increased, and the filtering information of the filtering unit 21 can be directly sent out; if the main control board 25 directly or indirectly controls the air speed of the air pump 27 The monitored airflow of the sensor 26 can be increased, and the detector can continue to operate until the main control panel 25 directly or indirectly controls the air pump 27 to adjust the airflow of the wind speed sensor 26, and the filter unit 21 is blocked.

In addition, the national standard "Fire Automatic Alarm System Design Specification" GB50116-2013 Article 6.2.2 ~ 6.2.10 stipulates the installation design requirements of point type smoke detector under various building structure conditions, such as room space height requirements , the height requirements of the beam of the ceiling, the horizontal distance to the wall and the beam edge, etc.; in addition, the standard 6.1.21 stipulates: “The point type smoke detector should be installed horizontally. When tilted, the angle of inclination should not be greater than 45°". These design and installation requirements are based on the fact that the smoke particles generated during the fire are limited by their natural diffusion characteristics in the space of the detection area. Therefore, the above-mentioned point type active smoke detectors must not only pay special attention to various building structures during engineering design. The requirements, therefore, lead to cumbersome engineering design, and even if the design is strictly in accordance with the standard specifications, due to the complicated construction of the construction site, it is difficult to meet the design requirements when installing the spot type smoke detectors on site.

Example 6

FIG. 10 is a schematic structural view of a point type active smoke detector with a gas collecting pipe provided by the embodiment. As shown in FIG. 10, the point type active smoke detector with a gas collecting pipe comprises a monitoring chamber 23 having gas inlet and outlet, a photoelectric sensor 24 composed of a photoelectric transmitting tube and a receiving tube, and a main control board 25; The main control board 25 and the photosensor 24 can be disposed in the monitoring chamber 23, and the airflow sucked into the monitoring chamber 23 from the gas inlet passes through the intersection of the two beams between the photo-emitting tube and the receiving tube on the photosensor 24, and the main control board 25 is electrically connected to the photoelectric sensor 24 for detecting changes in the electrical parameters of the sensor and for judging and outputting a fault or fire alarm signal; and providing an air pump 27 at the gas outlet of the monitoring chamber 23; the point type active with the gas collecting pipe The smoke detector further includes a gas collection pipe 08 connected to the gas inlet of the monitoring chamber 23 and having a gas recovery point or a hole; in order to prevent the detector from false alarm due to dust, it may be at the gas inlet of the monitoring chamber 23. The filter unit 21 is provided.

When the gas production pipe 08 is laid, it is only necessary to determine the position where the smoke particles generated during the fire in the detection area may spread. Set the position of the gas collecting point or hole (in fact, the position of the gas collecting point or hole replaces the setting position of the traditional point type smoke detector), and at the same time, the point type active smoke detector is placed in a convenient installation. The position can be, without having to consider the specific complex structure of the building in the detection area. For example, it is not necessary to install the point type active smoke detector on a high ceiling, which will cause maintenance inspection to be very troublesome; A gas collection pipe network is connected to the gas inlet of the monitoring chamber 23 on the smoke detector. The gas production pipe 08 can be made of soft plastic, hard plastic or steel pipe. In this way, the actual installation position of the detector can be free from the height of the building structure (when the detection height exceeds the requirements of the traditional detector, the detection height can be reduced by using different lengths of the gas production pipe to meet the fire detection requirements), the inclination, Limits such as location, such as ceiling mounting at any height on the wall, at any position that is not limited by the height of the beam, and ceiling installation at any position that is not affected by the slope of the house.

It is also possible to connect the gas outlet of the monitoring chamber 23 on the point type active smoke detector to the exhaust duct. In this case, it is not necessary to provide the air pump 27; in addition, an air supply fan or a monitoring chamber may be provided at the gas inlet of the monitoring chamber 23. The gas inlet of 23 is connected to the air supply duct.

The photoelectric sensor is an infrared sensor composed of an infrared emitting tube and a receiving tube, or a laser sensor composed of a laser emitting tube and a receiving tube of a red, blue or green light source, or the above-mentioned infrared sensor or laser sensor and gas sensor, A combination of at least one of the temperature sensors.

Figure 11 is a schematic view showing the installation of a gas collection pipe network 08' connecting a gas inlet at a gas inlet of a monitoring chamber on a point type active smoke detector without an independent air suction device. As shown in FIG. 11, each point type active smoke detector without an independent air suction device includes a monitoring chamber 23 having a gas inlet and outlet, a photoelectric sensor 24 composed of a photoelectric transmitting tube and a receiving tube, and a main control board. 25; wherein the main control board 25 and the photosensor 24 are both disposed in the monitoring chamber 23, and the airflow drawn into the monitoring chamber 23 from the gas inlet passes through the intersection of the two beams between the photo-emitting tube and the receiving tube on the photosensor 24. The main control board 25 is electrically connected to the photoelectric sensor 24 for detecting changes in the electrical parameters of the sensor and performing judgment and outputting a fault or fire alarm signal; the gas outlet of the monitoring chamber 23 is connected to the exhaust passage 07', and the gas inlets of the two monitoring chambers 23 A gas collection pipe network 08' with a gas collecting hole is respectively connected; in order to prevent the detector from false alarm due to dust, a filtering unit 21 may be disposed at the gas inlet of each monitoring chamber 23. In this way, when the gas collecting pipe network 08' is laid, the position of the gas collecting point or the hole on the gas collecting point or hole may be determined according to the position where the smoke particles generated during the fire in the detecting area may be spread, and the spot type is The active smoke detector can be placed in a convenient installation location without regard to the specific complex structure of the building in the detection area. For example, it is not necessary to install the point type active smoke detector on a high ceiling, which will result in maintenance inspection. It is very troublesome; the gas pipe network 08' can be made of soft plastic, hard plastic or steel pipe.

Example 7

FIG. 12 is a schematic structural diagram of an air sampling system using a point type active smoke detector with a gas collection pipe according to an embodiment of the present invention. As shown in FIG. 12, the conventional air sampling system mainly includes at least one sampling pipe 28, a casing 22, a suction air box 34, an exhaust fan installed therein, a gas collecting pipe 08, and a laser sensor and a laser monitoring chamber. The laser sensing unit, the system operating unit 05' and the display unit 33; wherein the suction bellows 34 and the laser sensing unit are disposed in the chassis 22; one end of the sampling tube 28 extends through the chassis 22 and is connected to the air inlet of the suction bellows 34. The side exhaust port of the suction bellows 34 is connected to the gas inlet of the laser sensing unit through the gas collection pipe 08; the system operation control unit 05' and the display unit 33 are disposed on the casing 22; this embodiment is in a conventional air sampling system The laser sensing unit is replaced with a monitoring chamber 23 provided with gas inlet and outlet in the point type active smoke detector, and a photoelectric sensor 24 disposed in the monitoring chamber 23 and composed of a photoelectric transmitting tube and a receiving tube. The photoelectric sensing unit, the gas inlet of the monitoring chamber 23 is connected to the gas collecting pipe 08. A small amount of air can be injected from the side exhaust port of the suction bellows 34 through the gas collection pipe 08 into the monitoring chamber 23 for monitoring by the inertia of the airflow in the exhaust fan. In addition, the use of an air sampling system based on such a photoelectric sensing unit can greatly reduce the cost of an air sampling system using a conventional laser sensor and its monitoring chamber.

In addition, in order to increase the flow rate and speed of the sample gas entering the monitoring chamber 23 on the photoelectric sensing unit, as shown in FIG. 13, an independent air pump 27 can be disposed at the gas outlet of the monitoring chamber 23, which can further improve the system fire. The response time of the alarm can overcome the wind resistance generated when the filter unit 21 is disposed at the gas inlet of the monitoring chamber 23, thereby facilitating the system to quickly and quickly detect the fire.

Example 8

FIG. 14 is a schematic structural diagram of an air sampling system using three sets of point type active smoke detectors with gas collection pipes according to an embodiment of the present invention. As shown in FIG. 14, the air sampling system using three sets of point type active smoke detectors with a gas collecting pipe comprises a casing 22, three sets of point type active smoke detectors with a gas collecting pipe, and a centralized operation control unit 05. And a display unit 33; wherein the structure of the point type active smoke detector is as shown in FIG. 10, which includes a monitoring chamber 23 having gas inlet and outlet, and photoelectric a photosensor 24 and a main control board 25 composed of a transmitting tube and a receiving tube; wherein the photosensor 24 is disposed in the monitoring chamber 23, and the airflow sucked into the monitoring chamber 23 from the gas inlet passes through the photo-emitting tube and the receiving tube of the photosensor 24. The intersection of the two beams, the main control board 25 is electrically connected to the photosensor 24 for detecting the change of the electrical parameters of the sensor and judging and outputting a fault or fire alarm signal; and providing an air pump 27 at the gas outlet of the monitoring chamber 23; One end of the plurality of gas collecting pipes 08 is connected to the gas inlet of a monitoring chamber 23 through the casing 22; the centralized operation control unit 05 and the display unit 33 are mounted on the casing 22. In order to prevent false alarms caused by dust due to dust, a filter unit 21 may be provided at the gas inlet of each monitoring chamber 23. The air sampling system is composed of at least one set of point-type active smoke detectors with a gas collection pipe, which is convenient to combine with a conventional air sampling system, and the cost of the air sampling system can be greatly reduced.

FIG. 15 is another schematic structural diagram of an air sampling system using three sets of point type active smoke detectors with gas collection pipes according to an embodiment of the present invention. As shown in Fig. 15, in this system, the gas outlet of each monitoring chamber 23 is connected to the total suction line 31 through a connecting pipe, and a total air pump 27' is mounted on the total suction line 31.

Claims

A point type active smoke detector mainly comprises a main control board (25), a monitoring chamber (23), a sensor (24) disposed in the monitoring chamber (23) and composed of a photo transmitting tube and a receiving tube, and monitoring The chamber (23) is connected and capable of drawing air in the detection area into the air suction device in the monitoring chamber (23), and the monitoring chamber (23) is provided with a gas inlet and outlet, and is characterized in that: the monitoring chamber ( 23) The upper gas inlet is directed to the gas outlet, and the gas stream passing through the monitoring chamber (23) passes through the two-beam intersection region between the photo-emitting tube and the receiving tube.
The point type active smoke detector according to claim 1, wherein the photo-emitting tube and the receiving tube are respectively an infrared light emitting tube and a receiving tube, or are respectively red, blue or green lasers. Launch tube and receiver tube.
The point type active smoke detector according to claim 1, wherein an angle between the central axes of the two beams between the photo transmitting tube and the receiving tube is greater than 0 degrees and less than 180 degrees.
A point type active smoke detector according to claim 1 or 2 or 3, wherein said air flow passing through said monitoring chamber (23) and said two between said photo transmitting tube and said receiving tube The plane in which the center axis of the beam is located is perpendicular or parallel.
The point type active smoke detector according to claim 1, wherein said point type active smoke detector further comprises a gas sensor or/and a temperature sensor.
The point type active smoke detector according to claim 5, wherein said gas sensor is a carbon monoxide, sulfur dioxide, carbon dioxide, ammonia, hydrogen sulfide or oxynitride gas sensor.
The point type active smoke detector according to claim 1, wherein said air extracting means is an air pump (27) disposed at a gas inlet or a gas outlet of said monitoring chamber (23), or Ventilation channel.
The point type active smoke detector according to claim 7, characterized in that the air pump (27) is a variable speed micro centrifugal or axial fan or a micro vacuum pump air pump.
The point type active smoke detector according to claim 1, wherein said point type active smoke detector further comprises a filtering unit (21) disposed at a gas inlet of said monitoring chamber (23) .
A point type active smoke detector according to claim 9, wherein said filtering unit (21) The middle filter layer is made of air filter paper or polypropylene non-woven material.
The point type active smoke detector according to claim 1, wherein said point type active smoke detector further comprises a wind speed sensor disposed on a gas path passing through the airflow passing through the monitoring chamber (23) ( 26).
The point type active smoke detector according to claim 11, characterized in that the wind speed sensor (6) is a platinum resistance, a 锗 thermistor or an ultrasonic wind speed sensor.
A point type active smoke detector with a gas collecting pipe mainly comprises a monitoring chamber (23) having gas inlet and outlet, a photoelectric sensor (24) composed of a photoelectric transmitting tube and a receiving tube, and a main control board (25); The main control board (25) and the photoelectric sensor (24) are both disposed in the monitoring chamber (23), and the airflow sucked into the monitoring chamber (23) from the gas inlet passes through the photo-emitting tube and the receiving tube on the photoelectric sensor (24). The intersection of the two beams, the main control board (25) is electrically connected to the photoelectric sensor (24) for detecting changes in the electrical parameters of the sensor and for judging and outputting a fault or fire alarm signal; at the gas outlet of the monitoring chamber (23) The air pumping device is provided; the point type active smoke detector with the gas collecting pipe further comprises a gas collecting pipeline connected with the gas inlet of the monitoring chamber (23) and having a gas collecting point or a hole.
The point type active smoke detector with a gas collecting pipe according to claim 12, wherein the gas collecting pipe is a gas collecting pipe (08) or a gas collecting pipe network (08').
The point type active smoke detector with a gas collecting pipe according to claim 13 or 14, wherein the photoelectric sensor is an infrared sensor composed of an infrared emitting tube and a receiving tube, or is made of red light, blue light or A laser sensor composed of a laser light emitting tube and a receiving tube of a green light source, or a combination of the above infrared sensor or laser sensor and at least one of a gas sensor and a temperature sensor.
An air sampling system using the point type active smoke detector with a gas collecting pipe according to claim 13, comprising at least one sampling pipe (28), a casing (22), a suction bellows (34) and being installed at An exhaust fan, a gas collecting pipe (08), a laser sensing unit composed of a laser sensor and a laser monitoring chamber, a system operating unit (05') and a display unit (33); wherein the air extracting bellows (34) and the laser The sensing unit is disposed in the chassis (22); one end of the sampling tube (28) passes through the chassis (22) and is connected to the air inlet of the air suction bellows (34), and the side exhaust port of the air suction bellows (34) passes through The air tube (08) is connected to the gas inlet of the laser sensing unit; the system operation control unit (05') and the display unit (33) are disposed on the chassis (22); wherein the laser sensing unit can be Point type active smoke detector A photoelectric sensing unit composed of a gas inlet and outlet monitoring chamber (23) and a photoelectric sensor (24) provided in the monitoring chamber (23) and composed of a photo-emitting tube and a receiving tube is replaced, and the monitoring chamber is The gas inlet of 23) is connected to the gas collection pipe (08).
The air sampling system according to claim 16, characterized in that the gas outlet of the monitoring chamber (23) is provided with an air pump (27).
An air sampling system using the point type active smoke detector with a gas collecting pipe according to claim 13, wherein the air sampling system mainly comprises a casing (22) and at least one set of points with a gas collecting pipe Active smoke detector, centralized operation control unit (05) and display unit (33); wherein the point type active smoke detector comprises a monitoring chamber (23) having gas inlet and outlet, and consisting of a photoelectric transmitting tube and a receiving tube Photoelectric sensor (24), main control board (25), gas collection tube (08); wherein the photoelectric sensor (24) is disposed in the monitoring chamber (23), and the airflow sucked into the monitoring chamber (23) from the gas inlet passes through the photoelectric The main beam (25) is electrically connected to the photoelectric sensor (24) on the sensor (24), and the main control board (25) is electrically connected to the photoelectric sensor (24); one end of the gas collecting pipe (08) is connected to the chassis (22) and connected to the monitoring. The gas inlet of the chamber (23); the centralized operation control unit (05) and the display unit (33) are mounted on the casing (22); and the gas outlet of the monitoring chamber (23) is provided with an air pump (27).
The air sampling system according to claim 18, wherein said at least one set of point type active smoke detectors in said air sampling system monitors a gas outlet of said chamber (23) (27) ) can be replaced by a total air extraction device, the gas outlet on each monitoring chamber (23) is connected to the total suction line of the total air extraction device.