Diffusion type gas alarm device upgraded to pump suction type gas alarm device

Abstract

The utility model relates to a gas alarm device upgraded from a diffusion type to a pumping type, which comprises a shell, a combustible gas sensor, a gas circuit module and a liquid level sensing module, the combustible gas sensor is connected with a gas hood, the gas circuit module comprises a gas pump, a gas inlet pipe and a gas outlet pipe, the gas inlet pipe is communicated with the external environment, and the gas outlet pipe is communicated with the liquid level sensing module. And the tail end of the air outlet pipe is connected to the air hood. The gas alarm device is provided with a gas circuit module, when a gas pump is started, surrounding environment gas is fed into a gas hood through a gas inlet pipe and a gas outlet pipe under the action of the gas pump, the rapid flowability of the gas is enhanced, and the gas concentration of a detection area is kept consistent with the surrounding environment gas concentration as rapidly as possible; and the detection efficiency and accuracy can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas leakage monitoring, and particularly relates to a gas alarm device upgraded from a diffusion type to a pump suction type. Background Technique

[0002] Most of the leakage detections in valve wells use the diffusion method. The disadvantage of this method is that the detection time is long, and the cycle for the leaked gas to diffuse to the sensor is relatively long, which may affect the accuracy of the collected gas. In other scenarios, pump suction type gas detection devices are also used. For example, the utility model patent with the authorization announcement number CN220271275U discloses a pump suction type gas detector, which includes a detector body, a sampling hose and a winding assembly. An air inlet pipe is provided on the detector body, and the sampling hose is connected to the air inlet pipe for sucking the gas to be detected into the detector body. However, for this patent document, the measurement point is a dangerous area, so a relatively long sampling hose is adopted, which is not applicable to the gas leakage detection in valve wells. Content of the Utility Model

[0003] The purpose of the utility model is to provide a gas alarm device upgraded from a diffusion type to a pump suction type to solve the drawbacks existing in the diffusion detection.

[0004] To achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The gas alarm device upgraded from a diffusion type to a pump suction type includes a housing, a combustible gas sensor and a gas path module. The combustible gas sensor is connected to a gas hood. The gas path module includes a gas pump, an air inlet pipe and an air outlet pipe connected to the gas pump. The air inlet pipe communicates with the external environment, and the end of the air outlet pipe is connected to the gas hood. The gas alarm device further includes a liquid level sensing module, and the liquid level sensing module includes a float rod and at least one float. The float rod is vertically arranged at the lower part of the housing.

[0006] Further, a data acquisition and processing module and a control module are arranged in the housing. The combustible gas sensor is connected to the data acquisition and processing module, the data acquisition and processing module is connected to the control module, the gas pump is connected to the control module, and the control module is used to control the start and stop of the gas pump; the liquid level sensing module is connected to the control module, and when the liquid level exceeds the set threshold, the control module controls the gas pump to stop running.

[0007] Further, the float adopts a floating ball. There are two floating balls, defined as an upper floating ball and a lower floating ball. When the lower floating ball floats upward to the set position, the control module controls the gas pump to stop running.

[0008] Further, the combustible gas sensor is arranged at the lower part of the housing, and the gas hood is located at the bottom end of the combustible gas sensor.

[0009] Further, the air pump is located in the housing, and the end of the intake pipe is located at the bottom of the housing, and the end of the intake pipe is higher than the end of the outlet pipe.

[0010] Advantages of the present utility model:

[0011] The gas alarm device of the present utility model is provided with an air path module. When the air pump is started, the surrounding ambient gas is sent into the air hood through the intake pipe and the outlet pipe under the action of the air pump, enhancing the rapid fluidity of the gas, so that the gas concentration in the detection area can be made to be as consistent as possible with the surrounding ambient gas concentration as quickly as possible. Compared with the conventional diffusion type, this pump suction type can improve the detection efficiency and accuracy.

[0012] Further, by setting a liquid level sensing module, the water level in the valve well can be sensed. When the set liquid level height is reached, the air pump is controlled to stop running to prevent water from being sucked in and damaging the monitoring device. Description of the drawings

[0013] Figure 1 It is a schematic structural diagram of the gas alarm device of the present utility model upgraded from a diffusion type to a pump suction type.

[0014] 1. Housing; 21. Air pump; 22. Intake pipe; 23. Outlet pipe; 3. Air hood; 4. Combustible gas sensor; 51. Floating ball; 52. Lower floating ball; 53. Float rod. Specific embodiments

[0015] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present utility model.

[0016] Embodiments of the present utility model:

[0017] Such as Figure 1As shown in the figure, the gas alarm device upgraded from diffusion type to pump suction type includes a housing 1 and a combustible gas sensor 4. A data acquisition and processing module and a control module are provided inside the housing 1. The combustible gas sensor 4 is connected to the data acquisition and processing module, and the data acquisition and processing module is connected to the control module. The control module can adopt a single-chip microcomputer. The combustible gas sensor 4, in this embodiment, preferably adopts a methane sensor, which is used to measure the methane concentration in the valve well and reflect whether the natural gas reaches the leakage standard. The methane sensor, such as the relatively mature MH-440V / D infrared gas sensor. The combustible gas sensor itself is not the innovation point of the present invention. In other embodiments, existing laser methane sensors can also be used. A communication module, such as NB-IoT, is also provided inside the housing 1. The communication module is connected to the control module and is used to transmit the processed gas concentration data to the monitoring platform remotely. The communication module can also be integrated into the single-chip microcomputer.

[0018] The combustible gas sensor 4 is arranged at the lower part of the housing 1. In this embodiment, the combustible gas sensor 4 is a module including an outer protective shell and internal components. The bottom of the combustible gas sensor 4 is provided with air holes for air intake. A gas hood 3 is connected to the bottom end of the combustible gas sensor 4. The inner cavity of the gas hood 3 is communicated with the detection cavity of the combustible gas sensor 4. The gas hood 3 can be made of stainless steel and is welded and fixed at the lower part of the combustible gas sensor 4 to achieve isolation from the external environment.

[0019] The gas alarm device also includes a gas path module. The gas path module includes a gas pump 21, an intake pipe 22 and an outlet pipe 23 connected to the gas pump 21. The intake pipe 22 communicates with the external environment, and the end of the outlet pipe 23 is connected to the gas hood 3. The gas pump 21 is located in the housing 1. The end of the intake pipe 22 is located at the bottom of the housing 1, and the end of the intake pipe 22 is higher than the end of the outlet pipe 23.

[0020] The gas pump 21 is connected to the control module, and the control module is used to control the start and stop of the gas pump 21. When in use, the leakage monitoring device is installed in the valve well. The housing 1 can be fixed to the well wall by expansion bolts, or a storage rack can be set in advance on the well wall, and the leakage monitoring device can be placed on the storage rack. Since the leakage monitoring device is placed in the valve well for a long time, it is not convenient for manual control of the gas pump 21. A timing module (which is part of the control module) is adopted, and the gas pump 21 starts and stops at a set time interval. When the gas pump 21 starts, the surrounding ambient gas is sent into the gas hood 3 through the intake pipe 22 and the outlet pipe 23 under the action of the gas pump 21, enhancing the rapid fluidity of the gas and making the gas concentration in the gas hood 3 as quickly as possible consistent with the surrounding ambient gas concentration, improving the detection efficiency and accuracy.

[0021] The gas alarm device also includes a liquid level sensing module. The liquid level sensing module is connected to the control module. When the liquid level exceeds the set threshold, the control module controls the gas pump 21 to stop running to avoid damaging the monitoring device.

[0022] The liquid level sensing module includes a float rod 53 and at least one float. The float rod 53 is vertically arranged at the lower part of the housing 1. In this embodiment, the float is a floating ball, and there are two floating balls, which are respectively defined as an upper floating ball 51 and a lower floating ball 52. There is a magnet in the floating ball. When the lower floating ball 52 floats upward to the set position, the air pump 21 is controlled to stop running. Both the upper floating ball 51 and the lower floating ball 52 have a certain floating stroke, such as about 1 cm. When the lower floating ball 52 is submerged by water, the lower floating ball 52 has risen to the top under the buoyancy of water and triggers the reed switch in the float rod (the reed switch closes, and the corresponding circuit conducts, so that the air pump 21 stops running); when the air pump 21 stops running, the surrounding gas concentration can also be detected by using the traditional diffusion detection method. When the water level is higher and the upper floating ball 51 is submerged, another reed switch in the float rod is triggered, and the corresponding circuit conducts, giving a signal to the control module, indicating that the periphery of the combustible gas sensor 4 is full of water, there is no gas, and the detection value is invalid.

[0023] In other embodiments, a liquid level sensor can also be set to replace the floating ball. A columnar float can also be used to replace the floating ball.

Claims

1. A gas alarm device that diffuses and upgrades to a pump suction type, characterized in that: It includes a housing, a combustible gas sensor, and a gas path module. The combustible gas sensor is connected to a gas hood. The gas path module includes a gas pump, an intake pipe and an exhaust pipe connected to the gas pump. The intake pipe communicates with the external environment, and the end of the exhaust pipe is connected to the gas hood. The gas alarm device further includes a liquid level sensing module, and the liquid level sensing module includes a float rod and at least one float. The float rod is vertically arranged at the lower part of the housing.

2. The gas alarm device with diffusion type upgraded to pump suction type according to claim 1, characterized in that: A data acquisition and processing module and a control module are provided in the housing. The combustible gas sensor is connected to the data acquisition and processing module, the data acquisition and processing module is connected to the control module, and the gas pump is connected to the control module. The control module is used to control the start and stop of the gas pump; the liquid level sensing module is connected to the control module, and when the liquid level exceeds the set threshold, the control module controls the gas pump to stop running.

3. The gas alarm device with diffusion type upgraded to pump suction type according to claim 1, characterized in that: The float adopts a floating ball. There are two floating balls, defined as an upper floating ball and a lower floating ball. When the lower floating ball floats upward to the set position, the control module controls the gas pump to stop running.

4. The gas alarm device with diffusion type upgraded to pump suction type according to claim 1, characterized in that: The combustible gas sensor is arranged at the lower part of the housing, and the gas hood is located at the bottom end of the combustible gas sensor.

5. The gas alarm device with diffusion type upgraded to pump suction type according to claim 4, characterized in that: The gas pump is located in the housing. The end of the intake pipe is located at the bottom of the housing, and the end of the intake pipe is higher than the end of the exhaust pipe.

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