Diffusion type gas alarm device updated to pumping typeTechnical Field
The utility model relates to the technical field of gas leakage monitoring, in particular to a diffusion type gas alarm device which is updated to a pumping type gas alarm device.
Background
Most of valve well leakage detection uses a diffusion mode, and the disadvantage of the diffusion mode is that the detection time is long, the period of the leaked gas diffusing to a sensor is relatively long, and the accuracy of gas collection can be affected. There are also pumping type gas detection devices in other scenes, for example, the patent of the utility model of the grant publication CN220271275U discloses a pumping type gas detector, which comprises a detector body, a sampling hose and a winding assembly, wherein the detector body is provided with an air inlet pipe, and the sampling hose is connected with the air inlet pipe and is used for sucking the detected gas into the detector body. However, the patent document is directed to a dangerous area, and therefore, a long sampling hose is used, which is not suitable for detecting gas leakage in a valve well.
Disclosure of utility model
The utility model aims to provide a diffusion type gas alarm device which is updated to a pumping type gas alarm device so as to solve the defects of diffusion type detection.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a diffusion formula upgrades to gas alarm device of formula of pumping, includes casing, combustible gas sensor, gas circuit module, and a gas hood is connected to the combustible gas sensor, and the gas circuit module includes the air pump, intake pipe and the outlet duct of being connected with the air pump, intake pipe intercommunication external environment, the end-to-end connection of outlet duct to the gas hood, gas alarm device still includes liquid level sensing module, and liquid level sensing module includes float pole, at least one float, and the vertical setting of float pole is in the lower part of casing.
Further, a data acquisition processing module and a control module are arranged in the shell, the combustible gas sensor is connected with the data acquisition processing module, the data acquisition processing module is connected with the control module, the air pump is connected with the control module, the control module is used for controlling the start and stop of the air pump, the liquid level sensing module is connected with the control module, and when the liquid level exceeds a set threshold value, the air pump is controlled to stop running.
Further, the floats adopt a floating ball, two floating balls are arranged and are defined as an upper floating ball and a lower floating ball, and when the lower floating ball floats upwards to a set position, the air pump is controlled to stop running.
Further, the combustible gas sensor is arranged at the lower part of the shell, and the gas cover is positioned at the bottom end of the combustible gas sensor.
Further, the air pump is arranged in the shell, the tail end of the air inlet pipe is arranged at the bottom of the shell, and the tail end of the air inlet pipe is higher than the tail end of the air outlet pipe.
The utility model has the beneficial effects that:
When the air pump is started, ambient air is fed into the air cover through the air inlet pipe and the air outlet pipe under the action of the air pump, so that the rapid fluidity of the air is enhanced, the air concentration in the detection area is kept consistent with the ambient air concentration as rapidly as possible, and compared with the conventional diffusion type, the pumping type air pump can improve the detection efficiency and accuracy.
Further, through setting up liquid level sensing module, can respond to the water level in the valve well, when reaching the settlement liquid level height, then control air pump no longer operates, prevents that water from being inhaled and damaging monitoring devices.
Drawings
FIG. 1 is a schematic diagram of a diffusion-to-pumping type gas alarm device of the present utility model.
1. 21 Parts of a shell, 21 parts of an air pump, 22 parts of an air inlet pipe, 23 parts of an air outlet pipe, 3 parts of an air cover, 4 parts of a combustible gas sensor, 51 parts of an upper floating ball, 52 parts of a lower floating ball, 53 parts of a floating ball and a floating rod.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which are derived by a person skilled in the art based on the embodiments of the utility model, fall within the scope of protection of the utility model.
Embodiments of the utility model:
As shown in FIG. 1, the diffusion type gas alarm device which is updated into a pumping type gas alarm device comprises a shell 1 and a combustible gas sensor 4, wherein a data acquisition processing module and a control module are arranged in the shell 1, the combustible gas sensor 4 is connected with the data acquisition processing module, the data acquisition processing module is connected with the control module, and the control module can adopt a singlechip. The combustible gas sensor 4, in this embodiment preferably a methane sensor, is used to measure the methane concentration in the valve well and to reflect whether the natural gas meets the leak criteria. Methane sensors, such as the more sophisticated MH-440V/D infrared gas sensor, flammable gas sensors themselves are not an innovation of the present utility model, and other embodiments may employ existing laser methane sensors. The housing 1 is further provided with a communication module, such as NB-IoT, connected to the control module for remotely transmitting the processed gas concentration data to the monitoring platform. The communication module can also be integrated into the singlechip.
The flammable gas sensor 4 is disposed at the lower part of the casing 1, in this embodiment, the flammable gas sensor 4 is a module comprising an outer protective shell and an inner element, and the bottom of the flammable gas sensor 4 is provided with ventilation holes for air intake. The bottom end of the flammable gas sensor 4 is connected with a gas cover 3, and the inner cavity of the gas cover 3 is communicated with the detection cavity of the flammable 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 realize isolation from the external environment.
The gas alarm device further comprises a gas circuit module, the gas circuit module comprises a gas pump 21, a gas inlet pipe 22 and a gas outlet pipe 23, the gas inlet pipe 22 is connected with the gas pump 21, the gas inlet pipe 22 is communicated with the external environment, and the tail end of the gas outlet pipe 23 is connected to the gas hood 3. The air pump 21 is located in the housing 1, and the end of the air inlet pipe 22 is located at the bottom of the housing 1, and the end of the air inlet pipe 22 is higher than the end of the air outlet pipe 23.
The air pump 21 is connected with a control module, and the control module is used for controlling the start and stop of the air pump 21. The leakage monitoring device is installed in the valve well when in use, the shell 1 can be fixed on the well wall by using expansion bolts, or a commodity shelf can be arranged on the well wall in advance, and the leakage monitoring device is placed on the commodity shelf. Because the leakage monitoring device is placed in the valve well for a long time, the air pump 21 is inconvenient to control manually, a timing module (which is a part of the control module) is adopted, and the air pump 21 is started and stopped at set time intervals. When the air pump 21 is started, ambient air is fed into the air hood 3 through the air inlet pipe 22 and the air outlet pipe 23 under the action of the air pump 21, so that the quick fluidity of the air is enhanced, the concentration of the air in the air hood 3 is kept consistent with that of the ambient air as quickly as possible, and the detection efficiency and accuracy are improved.
The gas alarm device further comprises a liquid level sensing module, wherein the liquid level sensing module is connected with the control module, and when the liquid level exceeds a set threshold value, the gas pump 21 is controlled to stop running so as not to damage the monitoring device.
The liquid level sensing module comprises a float rod 53 and at least one float, wherein the float rod 53 is vertically arranged at the lower part of the shell 1. In this embodiment, the floats are two, which are respectively defined as an upper floating ball 51 and a lower floating ball 52, wherein the floating ball is provided with a magnet, and the lower floating ball 52 floats upwards to a set position to control the air pump 21 to stop running. The upper floating ball 51 and the lower floating ball 52 have a certain floating stroke, for example, about 1 cm, when the lower floating ball 52 is submerged by water, the lower floating ball 52 rises to the top under the buoyancy of the water and triggers a reed pipe in the ball lever (the reed pipe is closed, a corresponding circuit is conducted, so that the air pump 21 stops running), and the air pump 21 stops running, so that the concentration of surrounding gas can be detected by using a traditional diffusion type detection mode. When the water level is higher, the upper floating ball 51 is submerged, the other reed pipe in the ball rod is triggered, the corresponding circuit is conducted, and a signal is given to the control module, so that the periphery of the combustible gas sensor 4 is filled with water, no gas exists, and the detection value is invalid.
In other embodiments, a liquid level sensor may be provided instead of the float. A columnar float can be used instead of the floating ball.