Waterproof breathable structure of underground gas sensor

Abstract

The utility model relates to the technical field of gas sensors, and provides a waterproof breathable structure of an underground gas sensor. The structure is composed of an upward seepage partition bin, a gas sensitive sensor partition bin and a downward seepage partition bin which are connected through threads and provided with hydrophobic breathable filter membranes. The upward seepage partition bin prevents gas from entering randomly when no underground water exists and prevents water from seeping when underground water exists. The infiltration partition bin allows gas to enter when no underground water exists and prevents water from permeating when underground water exists. A gas-sensitive sensor, a humidity sensor and a heating wire are arranged in the gas-sensitive sensor compartment, so that humidity can be monitored and moisture can be removed. The structural design is ingenious, different conditions can be effectively handled, and it is guaranteed that the gas sensor works in a dry environment. The integral structure is compact, the reliability is high, the waterproof and breathable problems of the underground gas-sensitive sensor are solved, and the sensor is suitable for the fields of underground gas pipeline gas monitoring and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of gas sensors, in particular to a waterproof and breathable structure of an underground gas sensor. Background Art

[0002] A gas sensor is a sensor that can convert information such as the composition and concentration of a gas into an electrical signal. It mainly reacts with the gas and produces changes in the electrical signal. Underground gas sensors are mainly used to monitor the concentration of various gases escaping from underground gas pipelines. The concentration signal is obtained by monitoring the gas sensor. The gas sensor requires a dry environment, so this packaging structure is designed to protect the underground gas sensor from groundwater immersion and keep it dry. Summary of the invention

[0003] The purpose of the utility model is to provide a waterproof and breathable structure of an underground gas sensor to solve the problems raised in the above background technology. The specific contents are as follows:

[0004] The packaging structure consists of an upper layer, a middle layer and a lower layer.

[0005] Upper layer: called the upper infiltration compartment, which is composed of a heavy ball and a heavy ball seat. Under normal conditions without groundwater, because the density of the heavy ball is slightly greater than 1, the sealing surface of the heavy ball and the heavy ball seat fits tightly. When the measured gas in the middle layer floats upward, the sealing surface can be blown open to allow the measured gas to float upward into the outside world; under abnormal conditions with groundwater, liquid moisture can be prevented from infiltrating the gas sensor from the upper filter to the lower part. When groundwater directly enters the upper infiltration compartment from the upper filter position, the heavy ball will not float in the water and maintain the seal.

[0006] Middle layer: called the gas sensor compartment, it is used to sense and measure the concentration of the gas being measured. The components include gas sensors, humidity sensors, and heating wires, and are integrated on a PCB baseboard.

[0007] Lower layer: called the infiltration compartment, used to prevent groundwater from infiltrating upward from the lower filter into the gas sensor. It consists of a float, a float upper plug, and a float lower seat. In the normal state without groundwater, the float and the float upper plug are not tightly fitted, and the measured gas can enter the gas sensor compartment from the outside through the lower filter; in the abnormal state with groundwater, because the density of the float is slightly less than 1, when groundwater enters the infiltration compartment from the lower filter, the float will float to the float upper plug in the water to close the fluid flow channel, preventing the external fluid from entering the middle gas sensor compartment. When the groundwater seeps away, the float will fall back to the float lower seat and return to normal state. At this time, the concentration of the measured gas can be measured normally.

[0008] In addition, the upper layer, middle layer and lower layer are three independent compartments, which are connected by threaded sealing assembly between the upper layer and the middle layer, and between the middle layer and the lower layer, and a hydrophobic breathable filter membrane is added. When a small amount of water vapor enters the middle layer, the humidity sensor detects that the relative humidity reaches 100%, and the gas sensor will automatically power off and enter the protection state. The heating wire will heat up to evaporate the moisture in the gas sensor compartment and discharge it from the surrounding exhaust holes. The signal of the gas sensor is transmitted to the data acquisition instrument by the signal line from the wired lead hole.

[0009] Beneficial Effects

[0010] The utility model effectively solves the waterproof and air permeability problems of underground gas sensors, and has the advantages of simple structure and high reliability. It has the following significant beneficial effects:

[0011] The waterproof and breathable structure is cleverly designed. Through the special design of the upper infiltration compartment and the lower infiltration compartment, it can effectively cope with different situations with or without groundwater and provide reliable waterproof protection.

[0012] The gas sensor compartment in the middle layer integrates a variety of components to achieve accurate measurement of the concentration of the gas being measured. It also has humidity monitoring and moisture-proof measures to ensure the normal operation and measurement accuracy of the gas sensor.

[0013] The overall structure is compact and the various parts cooperate with each other, which is both waterproof and can ensure a certain degree of air permeability, meeting the working requirements of underground gas sensors. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solution of the embodiment of this patent, the following is a brief introduction to the drawings required for use in the embodiment. It should be understood that the following drawings only show certain embodiments of this patent and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0015] Figure 1 The overall structure of the waterproof and breathable structure of the underground gas sensor of the present invention and the relationship between its various parts are shown in the figure. The following key components and their connection relationships are clearly marked in the figure, including (1) upper infiltration compartment, (2) gas sensor compartment, (3) lower infiltration compartment, (4) heavy ball, (5) heavy ball seat, (6) gas sensor, (7) humidity sensor, (8) heating wire, (9) float, (10) float upper plug, (11) float lower seat, (12) thread, (13) hydrophobic breathable filter membrane, (14) exhaust hole, (15) signal line, (16) wire lead hole, (17) data acquisition instrument, (18) upper filter screen, and (19) lower filter screen. The following is a detailed explanation of the main components of the device:

[0016] Infiltration compartment (1):

[0017] Structure: It consists of a heavy ball (4) and a heavy ball seat (5).

[0018] Function: Under normal conditions without groundwater, the heavy ball and the heavy ball seat fit tightly together to prevent the outside gas from entering at will; when there is abnormal groundwater, it can prevent water from seeping into the gas sensor compartment from above.

[0019] Gas sensor compartment (2):

[0020] Structure: It contains a gas sensor (6), a humidity sensor (7), and a heating wire (8).

[0021] Function: The gas sensor (6) is used to sense and measure the concentration of the gas being measured; the humidity sensor (7) is used to monitor the humidity; the heating wire (8) is used to heat and remove moisture when the humidity is high.

[0022] Infiltration compartment (3):

[0023] Structure: It consists of a float (9), a float upper plug (10), and a float lower seat (11).

[0024] Function: When there is no groundwater, the float and the upper plug of the float are not tightly fitted, allowing gas to enter; when there is groundwater, the float floats up and fits the upper plug of the float to prevent water from seeping into the gas sensor compartment from below.

[0025] Thread (12): used to connect the upper infiltration compartment, the gas sensor compartment and the lower infiltration compartment, and plays a role of fixing and sealing.

[0026] Hydrophobic breathable filter membrane (13): allows gas to pass through while preventing large amounts of water from entering.

[0027] Exhaust hole (14): used to discharge moisture generated by heating.

[0028] Signal line (15): used to transmit the signal of the gas sensor.

[0029] Wired lead hole (16): for signal wires to pass through and connect to data acquisition instruments.

[0030] Data acquisition device (17): collects and processes the signals transmitted by the gas sensor and displays the concentration of the measured gas.

[0031] Upper filter (18): located at the top of the upper infiltration compartment, to prevent foreign matter from entering the compartment. Its mesh structure and specific mesh size design can effectively block larger particles and debris without affecting gas circulation. A fixing device is provided on the edge for installation.

[0032] Lower filter (19): located at the bottom of the infiltration compartment, to prevent impurities in the groundwater from entering the gas sensor compartment. Its structure and material are similar to those of the upper filter, but will be adjusted according to actual conditions to adapt to different filtering requirements. A support structure is provided below to ensure that it can withstand the groundwater pressure and maintain a stable position. DETAILED DESCRIPTION

[0033] In actual use, the underground gas sensor is installed in the waterproof and breathable structure. The following is the content about the "specific implementation method":

[0034] In practical applications, the underground gas sensor is installed in the waterproof and breathable structure. When in a normal environment without groundwater, the heavy ball (4) in the upper infiltration compartment (1) fits tightly with the heavy ball seat (5), preventing external gas from entering the gas sensor compartment (2) at will. At the same time, the floating ball (9) in the lower infiltration compartment (3) does not fit tightly with the floating ball upper plug (10), and the measured gas can enter the gas sensor compartment (2) from the outside through the lower filter screen, and the gas sensor (6) senses and measures the gas concentration normally. At this time, the humidity monitored by the humidity sensor (7) is within the normal range.

[0035] When there is abnormal groundwater, the heavy ball (4) in the upper infiltration compartment (1) will not float in the water, and maintain the seal with the heavy ball seat (5), preventing groundwater from infiltrating into the gas sensor compartment (2) from above; the floating ball (9) in the lower infiltration compartment (3) will float up to fit with the floating ball upper plug (10) when immersed in water, thereby closing the fluid flow channel and preventing the external fluid moisture from entering the middle layer gas sensor compartment (2). If a small amount of water vapor enters the middle layer, when the humidity sensor (7) detects that the relative humidity reaches 100%, the gas sensor (6) will automatically cut off the power and enter the protection state, and the heating wire (8) will start heating to evaporate the moisture in the gas sensor compartment (2) and discharge it from the surrounding exhaust holes (14). The signal of the gas sensor (6) is transmitted to the data acquisition instrument (17) through the wire lead hole (16) by the signal line (15).

[0036] During the whole process, the upper infiltration compartment (1), the gas sensor compartment (2) and the lower infiltration compartment (3) cooperate with each other, which not only effectively prevents the groundwater from damaging the gas sensor, but also ensures the normal circulation and measurement of gas under normal circumstances, thereby ensuring that the underground gas sensor works stably and reliably.

Claims

1. A waterproof and breathable structure of an underground gas sensor, characterized in that: It includes an upper infiltration compartment, a middle gas sensor compartment and a lower infiltration compartment. The upper infiltration compartment is composed of a heavy ball and a heavy ball seat. The gas sensor compartment is provided with a gas sensor, a humidity sensor and a heating wire. The lower infiltration compartment is composed of a float, an upper float plug and a lower float seat. The upper infiltration compartment and the gas sensor compartment, as well as the gas sensor compartment and the lower infiltration compartment are connected by threads and are provided with a hydrophobic breathable filter membrane.

2. The waterproof and breathable structure of the underground gas sensor according to claim 1, characterized in that: When there is no groundwater in the infiltration compartment, the heavy ball and the heavy ball seat are tightly fitted to prevent external gas from entering at will.

3. The waterproof and breathable structure of the underground gas sensor according to claim 1, characterized in that: When there is no groundwater in the infiltration compartment, the float and the upper plug of the float are not tightly fitted to allow gas to enter.

4. The waterproof and breathable structure of the underground gas sensor according to claim 1, characterized in that: When there is groundwater in the infiltration compartment, the float floats up and fits with the upper plug of the float to prevent water from infiltrating into the gas sensor compartment from below.

5. The waterproof and breathable structure of the underground gas sensor according to claim 1, characterized in that: The humidity sensor in the gas sensor compartment is used to monitor the humidity, and the heating wire is used to heat and remove moisture when the humidity is high.

6. The waterproof and breathable structure of the underground gas sensor according to claim 1, characterized in that: The thread is used to connect the compartments and play a role of fixing and sealing.

7. The waterproof and breathable structure of the underground gas sensor according to claim 1, characterized in that: The hydrophobic, breathable filter membrane allows gas to pass through while preventing significant ingress of water.

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