Fixed gas detector for underground space of pipe gallery

Abstract

The utility model relates to the technical field of gas detection, in particular to a fixed gas detector for underground space of a pipe gallery, which comprises a probe and a main body, an anti-explosion sheet and a waterproof breathable film are arranged at a gas inlet of the probe, and the waterproof breathable film and the gas inlet are in a closed state and are used for preventing water from entering the probe or soaking the anti-explosion sheet. The anti-explosion piece is used for supporting the waterproof breathable film and preventing the waterproof breathable film from deforming. According to the utility model, a layer of waterproof breathable film made of polytetrafluoroethylene is adhered between the explosion-proof sheet and the supporting shell of the explosion-proof sheet. The film has hydrophobicity, so that water cannot enter or soak the explosion-proof sheet. The gas sensor is waterproof, dustproof and breathable, and work of the gas sensor is not affected. The gas detector fault caused by underground soaking of the pipe gallery is solved, and the reliability of the gas detector is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to gas detection technical field, concretely is a kind of fixed gas detector for pipe gallery underground space. BACKGROUND

[0002] The humidity of pipe gallery underground space is large and inconvenient to maintain, which requires the fixed gas detector installed therein to have high reliability. The fixed gas detector is an instrument for detecting the concentration and type of gas in the environment, widely used in industry, environmental protection, construction, fire fighting and other fields, and is of great significance to personnel safety and environmental monitoring.

[0003] The fixed gas detector usually consists of a main body and a probe. The main body is made of a metal shell, equipped with internal circuits, which can realize real-time monitoring, signal output, data storage and linkage control functions, and some also have a glass window for displaying the detected gas concentration and other related information. The lower part of the main body is connected to the probe through threads, and the probe is internally installed with a gas sensor and its working circuit.

[0004] The existing fixed gas detector has defects, and water can enter the instrument interior through the gas inlet of the probe, thereby damaging the internal circuit or sensor and causing false alarms, with low reliability. Therefore, there is an urgent need to develop a fixed gas detector suitable for pipe gallery underground space with high reliability. UTILITY MODEL CONTENTS

[0005] The utility model aims to provide a fixed gas detector for pipe gallery underground space, which has waterproof and dustproof functions, can ventilate, and will not affect the normal operation of the gas sensor, effectively solving the problem of reading affected by the high humidity of pipe gallery underground space and even instrument damage.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a fixed gas detector for pipe gallery underground space, comprising a probe and a main body. An explosion-proof sheet and a waterproof and breathable film are arranged at the gas inlet of the probe, the waterproof and breathable film is tightly attached to the gas inlet and is in a sealed state, which prevents water from entering the probe interior and avoids wetting the explosion-proof sheet; the explosion-proof sheet is used to support the waterproof and breathable film and prevent it from deforming due to external force.

[0007] Further, the probe includes an upper probe shell and a lower probe shell, which are connected by threads and sealed by wrapping raw tape at the connection to ensure the sealing of the connection and prevent water vapor from entering.

[0008] Further, the waterproof and breathable membrane is provided with annular back glue, which is convenient for firmly bonding the waterproof and breathable membrane on the lower probe shell, and the waterproof and breathable membrane is arranged in the recess of the lower probe shell. Such design not only guarantees the installation stability of the waterproof and breathable membrane, but also avoids damage of the waterproof and breathable membrane due to external impact.

[0009] Further, the waterproof and breathable membrane is arranged between the explosion-proof sheet and the supporting shell of the lower probe shell. Such arrangement is beneficial to the waterproof and dustproof and breathable function of the waterproof and breathable membrane, and the waterproof and breathable membrane is protected by the explosion-proof sheet and the supporting shell.

[0010] Further, the explosion-proof sheet is tightly pressed by the screw thread between the upper pressing ring and the lower probe shell, so that the explosion-proof sheet is firmly installed, and the waterproof and breathable membrane is stably supported while the explosion-proof effect is achieved.

[0011] Further, the explosion-proof sheet adopts a metal sintered mesh structure, which can effectively prevent explosion and ensure normal diffusion of gas, so as to meet the demand of the detector on gas detection.

[0012] Further, the waterproof and breathable membrane is a polytetrafluoroethylene film, which has good hydrophobicity, can effectively prevent water from entering, and ensure smooth gas permeation, and does not affect the working performance of the gas sensor.

[0013] Compared with the prior art, the utility model has the advantages of the following:

[0014] The waterproof and breathable membrane is tightly attached by surrounding back glue bonding and physical extrusion of the explosion-proof sheet, and the installation structure is compact, which does not increase the internal space and slightly affects the response speed of the sensor, and also has the effects of dustproof and windproof. In addition, the waterproof and breathable membrane is thin, and the water pressure may cause deformation or even damage of the waterproof and breathable membrane when the waterproof and breathable membrane is in water. The explosion-proof sheet can play a supporting role to resist the water pressure and ensure that the waterproof and breathable membrane is not deformed. This makes the fixed gas detector not affected in performance even if it is soaked in water for a long time, is convenient to use, has high and efficient waterproof effect, can be soaked in water for at least 20 days without affecting the product function, makes the fixed gas detector reach the highest IP86 protection level, and greatly improves the reliability. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a structural schematic view of the utility model.

[0016] In the figure: 1, upper probe shell; 2, lower probe shell; 3, pressing ring; 4, supporting shell; 5, explosion-proof sheet; 6, waterproof and breathable membrane; 7, screw thread one; 8, screw thread two. DETAILED DESCRIPTION

[0017] Clearly, the described embodiments are merely a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0018] As shown in the drawings, the utility model discloses a fixed gas detector for pipe gallery underground space, including probe and main part. Figure 1 The gas inlet of the probe is provided with an explosion-proof sheet 5 and a waterproof air-permeable film 6, the waterproof air-permeable film 6 is tightly sealed with the gas inlet, water is prevented from entering the inside of the probe or wetting the explosion-proof sheet 5, and the explosion-proof sheet 5 provides support for the waterproof air-permeable film 6 and prevents the deformation of the waterproof air-permeable film 6.

[0019] The explosion-proof sheet 5 is placed at the gas inlet of the probe of the sensor, and the explosion-proof requirement can be met. The explosion-proof sheet 5 has various types such as sintering of metal particles, weaving and punching of a metal mesh or a composite of the two, and gas is diffused to the sensor through the explosion-proof sheet 5 and detected. However, the explosion-proof sheet 5 does not have a waterproof function, when a water flooding accident occurs in the underground space where the device is located, water can enter the inside of the detector through the explosion-proof sheet 5, damage the internal circuit or the sensor, and cause false alarms; if the explosion-proof sheet 5 is only splashed by water, the water can also wet the explosion-proof sheet 5, hinder the diffusion of gas to the sensor; in addition, dust and dirt in the underground space can also adhere to the explosion-proof sheet 5, cause blockage, affect the passage of gas, and cause the detection value to be lower than the actual value.

[0020] A waterproof air-permeable film 6 made of polytetrafluoroethylene is pasted between the explosion-proof sheet 5 and the support shell 4 thereof, the film has hydrophobicity, can effectively prevent water from entering or wetting the explosion-proof sheet 5, realizes waterproof and dustproof at the same time, ensures that gas can smoothly permeate, and does not affect the work of the gas sensor.

[0021] Since the waterproof air-permeable film 6 is relatively thin, the pressure of water can cause the deformation or even damage of the waterproof air-permeable film 6 when the waterproof air-permeable film 6 is in water, the explosion-proof sheet 5 can play a supporting role, resist the pressure of water, ensure that the waterproof air-permeable film 6 does not deform, and thus the performance of the gas alarm is not affected even if the gas alarm is soaked in water for a long time.

[0022] The probe includes an upper probe shell 1 and a lower probe shell 2, the upper probe shell 1 and the lower probe shell 2 are connected through threads two 8, and the connection part is sealed by winding raw tape. The waterproof air-permeable film 6 is located between the explosion-proof sheet 5 and the support shell 4 of the lower probe shell 2, and is a thin film made of polytetrafluoroethylene.

[0023] The waterproof and breathable membrane 6 has an adhesive ring and is bonded to the recess of the lower probe housing 2. Combined with the compression at the explosion-proof area, this ensures a strong bond and effectively prevents water from seeping in from the edge joints. Simultaneously, the placement of the waterproof and breathable membrane 6 in the recess reduces the risk of damage from impacts. The explosion-proof sheet 5 is tightened and secured by the upper pressure ring 3 through the thread 7 between it and the lower probe housing 2.

[0024] In practical use, the waterproof and breathable membrane adheres tightly through the surrounding adhesive bonding and the physical compression of the explosion-proof sheet 5, resulting in a compact installation structure without increasing internal space. This minimizes the impact on sensor response speed and also provides dust and wind protection. This fixed gas detector is easy to use, has excellent waterproof performance, and can be submerged in water for at least 20 days without affecting its effectiveness, achieving the highest IP86 protection rating and significantly improving reliability.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fixed gas detector for underground spaces in utility tunnels, comprising a probe and a main body, characterized in that: The probe's air inlet is equipped with an explosion-proof sheet (5) and a waterproof and breathable membrane (6). The waterproof and breathable membrane (6) is sealed to the air inlet to prevent water from entering the probe or wetting the explosion-proof sheet (5). The explosion-proof sheet (5) supports the waterproof and breathable membrane (6) to prevent it from deforming.

2. A fixed gas detector for underground space in a utility tunnel according to claim 1, characterized in that: The probe includes an upper probe housing (1) and a lower probe housing (2), which are connected by a threaded connection (8) and sealed with PTFE tape at the connection.

3. A fixed gas detector for underground space in a utility tunnel according to claim 2, characterized in that: The waterproof and breathable membrane (6) has an annular adhesive backing and is bonded to the lower probe housing (2), and the waterproof and breathable membrane (6) is set in the recess of the lower probe housing (2).

4. A fixed gas detector for underground space in a utility tunnel according to claim 3, characterized in that: The waterproof and breathable membrane (6) is disposed between the explosion-proof sheet (5) and the supporting shell (4) of the lower probe shell (2).

5. A fixed gas detector for underground space in a utility tunnel according to claim 2, characterized in that: The explosion-proof sheet (5) is pressed down by the upper pressure ring (3) through the thread (7) between it and the lower probe housing (2).

6. A fixed gas detector for underground spaces in utility tunnels according to any one of claims 1-5, characterized in that: The explosion-proof sheet (5) has a sintered metal mesh structure.

7. A fixed gas detector for underground spaces in utility tunnels according to any one of claims 1-5, characterized in that: The waterproof and breathable membrane (6) is a thin film made of polytetrafluoroethylene.

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