CN209879689U - Composite explosion-proof anti-backfire pipeline type smoke detector - Google Patents

Abstract

The utility model discloses a composite explosion-proof anti-backfire pipeline type smoke detector, which comprises an air inlet pipeline, a pipeline air inlet, a pipeline air outlet, an explosion-proof case shell, a carbon monoxide detector, a smoke detector and an acquisition circuit; the pipeline air inlet and the pipeline air outlet are arranged on the explosion-proof case shell, the front end of the air inlet pipeline is positioned in the dangerous area, the rear end of the air inlet pipeline and the explosion-proof case shell are both positioned in the safe area, and the pipeline air inlet is communicated with the pipeline air outlet through a detection air passage in the explosion-proof case shell; the acquisition circuit is also positioned in the explosion-proof case shell; the detection air passage comprises a flame arrester, a carbon monoxide detector, an air passage parallel loop and a smoke detector which are sequentially communicated. The carbon monoxide detector is used for analyzing whether carbon monoxide exists or not while the pipeline type smoke detector is used for detecting the smoke concentration, so that interference factors can be effectively eliminated, and false alarms are reduced; the embedding of the flame arrester effectively eliminates the risk of backfire of the detector for explosion-proof hazardous spaces.

Description

Composite explosion-proof anti-backfire pipeline type smoke detector

Technical Field

The utility model relates to a pipeline formula smog fire detector field specifically is one kind and can prevent false positive, and anti-backfire satisfies the novel product of explosion-proof requirement.

Background

Among the detectors used in large-space fire monitoring places, the pipeline type smoke detector is the most common monitoring device and is an important quick-response air-extraction type early warning system. It can react during the initial stages of a fire, i.e. when no visible smoke or open flame is present, and has proven to be the most efficient and economical means of smoke and other pollutant detection in large spaces; also called as aspirated or sampled smoke detection device according to its working principle. The detector may measure the amount of smoke particles in the air sample if any. The measured signal is processed by software and compared with a preset alarm threshold value, if a certain alarm threshold value is reached, a corresponding alarm signal is given on a display.

The common pipeline type smoke detector samples through a pipeline, analyzes the smoke concentration in the sampled gas, compares the smoke concentration with a preset alarm value, and analyzes and judges whether a fire disaster occurs or not. However, if open fire exists at the air outlet of the air suction type pipeline detector, the fire can be tempered and led into a dangerous explosion-proof area through a pipeline; the common pipeline type smoke detector has no explosion-proof authentication and cannot be used in a dangerous explosion-proof area at present; ordinary pipeline formula smoke detector can only detect solid particle to big humidity, the severe weather of haze, dust space etc. produces the wrong report police (smoke detector's theory of operation is just monitoring the particulate matter concentration in the sample gas).

Disclosure of Invention

The utility model aims at providing a composite explosion-proof type backfire-proof pipeline type smoke detector, which solves the technical problem that if an open fire exists at the gas outlet of an air suction type pipeline detector, the fire can be backfire through a pipeline and is led into a dangerous explosion-proof area; meanwhile, the technical problem of false alarms of the air suction type pipeline detector in heavy humidity, severe haze weather, dust space and the like is solved.

In order to achieve the above purpose, the technical solution adopted by the present invention is as follows:

a composite explosion-proof anti-backfire pipeline type smoke detector comprises an air inlet pipeline, a pipeline air inlet, a pipeline air outlet, an explosion-proof case shell, a carbon monoxide detector, a smoke detector and an acquisition circuit; the pipeline air inlet and the pipeline air outlet are arranged on the explosion-proof case shell, the air inlet pipeline is arranged on the pipeline air inlet, the front end of the air inlet pipeline is positioned in the dangerous area, the rear end of the air inlet pipeline and the explosion-proof case shell are both positioned in the safe area, and the pipeline air inlet is communicated with the pipeline air outlet through a detection air passage in the explosion-proof case shell; the acquisition circuit is also positioned in the explosion-proof case shell; the detection air passage comprises a flame arrester, a carbon monoxide detector, an air passage parallel loop and a smoke detector which are sequentially communicated.

The explosion-proof case shell comprises a case cover plate and a case body, which are sealed by elastic pressing cotton extrusion, the case cover plate is connected by a whole circle of screws, and the case body external interface, the indicator light and the display area are all elements with protection.

The utility model has the advantages that: a flame arrester is arranged in the case to separate a safe area from a monitoring area, so that the condition of ignition due to backfire is avoided; when the pipeline type smoke detector is used in a dangerous explosion-proof area, the sampling pipeline is arranged in a monitoring space, and the smoke detector is arranged in other rooms, so that the situation of ignition is further prevented; a carbon monoxide detector is embedded in the sampling pipeline, so that whether carbon monoxide exists in smoke can be detected, whether fire disasters occur is confirmed, and the condition of false alarm is avoided; the device completely conforms to the GB3836 standard.

Drawings

Fig. 1 is a schematic view of the structure and the working principle of the present invention.

Fig. 2 is a schematic view of the installation position of the present invention.

Fig. 3 is a side sectional view of the structure of the present invention.

Fig. 4 is an enlarged partial structural view of I of fig. 3.

Numbering in the figures: 1. the device comprises a pipeline air inlet, a pipeline flame arrester, a pipeline air outlet, a pipeline carbon monoxide detector, a pipeline smoke outlet, a pipeline smoke detector, a pipeline smoke outlet, a pipeline.

Detailed Description

The structure of the utility model is shown in figure 1. A composite explosion-proof anti-backfire pipeline type smoke detector comprises an air inlet pipeline, a pipeline air inlet, a pipeline air outlet, an explosion-proof case shell, a carbon monoxide detector, a smoke detector and an acquisition circuit. The pipeline air inlet and the pipeline air outlet are arranged on the shell of the explosion-proof case, and the air inlet pipeline is arranged on the pipeline air inlet. Referring to fig. 2, the front end of the air inlet pipeline is located in the danger zone, and the rear end and the explosion-proof case shell are both located in the safety zone. The pipeline air inlet is communicated with the pipeline air outlet through a detection air passage in the explosion-proof case shell; the acquisition circuit is also positioned in the explosion-proof case shell; the detection air passage comprises a flame arrester, a carbon monoxide detector, an air passage parallel loop and a smoke detector which are sequentially communicated.

Referring to fig. 3 and 4, the explosion-proof case shell comprises a case cover plate and a case body, which are sealed by elastic pressing cotton in an extruding manner, the case cover plate is connected by a whole circle of screws, and the case body external interface, the indicator light and the display area are all elements with protection.

The utility model discloses the theory of operation: firstly, if moisture exists in the air and the humidity reaches about 95%, sampling is carried out through a pipeline, and when water vapor particles reach an alarm value, a detector alarms; or use talcum powder (the preferred mode of the utility model is that under the big condition of other powder granule, can be got rid of the interference by detector software automatically) to get into the detector from the pipeline, its granule also can disturb the detector, produces the wrong report. In order to solve the problem of false alarm, a carbon monoxide detector is embedded in a sampling pipeline, so that whether carbon monoxide exists in smoke can be detected, and whether a fire disaster occurs can be determined. Carbon monoxide detector embedding is inside pipeline formula smoke detector box, and through detecting whether carbon monoxide exists, if do not have carbon monoxide, in time there is the smog granule, also can not the wrong report conflagration.

Secondly, when the pipeline type smoke detector is used in a dangerous explosion-proof area, the sampling pipeline is installed in a monitoring space, the smoke detector is installed in other rooms, the placing space is shown in figure 2, the arrow direction is the gas flowing direction in a normal monitoring state, namely, gas in the dangerous space is sampled to the pipeline type air suction detector, the smoke concentration is detected for sampled air, the gas is discharged from the gas outlet after the detection is finished, and the gas path inlet and outlet are shown in figure 1.

As can be seen from fig. 2, under normal operating conditions, the direction of gas flow of the ducted inspiration probe is as shown in the figure, and when there is an open fire at the outlet (safe zone, i.e. non-monitored zone), there is a potential for flashback from the duct, igniting the monitored zone, i.e. the fire will enter the monitored zone in the direction opposite to the direction of the arrow.

In view of the fact that dangerous conditions may exist under certain conditions, the novel fire arrestor is installed in the case to isolate the ignition condition of a monitoring area of a safe area, and the schematic installation position is shown in figure 1.

Third, no pipeline formula smoke detector can be used to explosion-proof occasion in the existing market, and explosion-proof standard GB3836.8 sparkless type electrical equipment is adopted to this case shell structure, and the case is except admitting air the gas outlet, satisfies the sealed requirement of national standard to the structure, and box cover plate screw is inseparable, and the distance is about 50mm, guarantees to seal closely between with the box.

Claims (2)

1. A composite explosion-proof anti-backfire pipeline type smoke detector is characterized by comprising an air inlet pipeline, a pipeline air inlet, a pipeline air outlet, an explosion-proof case shell, a carbon monoxide detector, a smoke detector and an acquisition circuit; the pipeline air inlet and the pipeline air outlet are arranged on the explosion-proof case shell, the air inlet pipeline is arranged on the pipeline air inlet, the front end of the air inlet pipeline is positioned in the dangerous area, the rear end of the air inlet pipeline and the explosion-proof case shell are both positioned in the safe area, and the pipeline air inlet is communicated with the pipeline air outlet through a detection air passage in the explosion-proof case shell; the acquisition circuit is also positioned in the explosion-proof case shell; the detection air passage comprises a flame arrester, a carbon monoxide detector, an air passage parallel loop and a smoke detector which are sequentially communicated.

2. The composite explosion-proof and backfire-proof pipeline type smoke detector as claimed in claim 1, wherein the explosion-proof case housing comprises a case cover plate and a case body, both of which are sealed by elastic pressing cotton in an extruding manner, the case body cover plate is connected by a whole circle of screws, and the case body external interface, the indicator light and the display area are protected elements.