Gas detection device and intelligent monitoring method for gas in pipeline

Abstract

The invention relates to the technical field of municipal administration, in particular to a gas detection device and an intelligent monitoring method for gas in a pipeline. The box body assembly comprises an upper box body and a lower box body which are detachably connected, and a containing cavity is formed in the box body assembly; the at least one gas detection unit is installed in the containing cavity, and the at least one gas inlet is formed in the lower box body and corresponds to the gas detection unit; and the power supply module is electrically connected with the energy collection device and the gas detection unit. And a sealing gasket is arranged between the lower box body and the upper box body. The problems of energy pipeline leakage in urban underground infrastructure, harmful gas accumulation in a closed space and timely discovery and early warning are solved.

Description

Technical Field

[0001] The present invention relates to the field of municipal technology, and in particular to a gas detection device and an intelligent monitoring method for gas in a pipeline. Background Art

[0002] The underground of cities and their suburbs is full of various municipal pipelines, including energy pipelines for transporting gas, crude oil and liquefied gas, which are key components of urban operations and residents' lives. In addition, there are a large number of rainwater and sewage pipelines and various trenches, and there are many relatively confined spaces in these facilities. The technical problems are mainly reflected in the following aspects: When energy pipelines leak due to defects or external damage, combustible gases or liquids may randomly infiltrate into nearby rainwater pipes, sewage pipes or any other confined environments such as trenches; sewage, septic tanks and other facilities may also produce methane, hydrogen sulfide and other flammable, explosive and toxic gases due to the anaerobic decomposition of their own waste. The above reasons may cause the risk of explosion and poisoning in related facilities.

[0003] Manhole cover design lacks intelligence: Existing manhole covers are mostly made of ordinary ductile iron with single functions. They can only provide basic sealing effects, but lack the ability to monitor changes in the internal environment, such as real-time monitoring of parameters such as temperature, humidity and gas concentration, and are unable to warn of potential dangers.

[0004] Inefficient manual inspection: The traditional method of relying on regular manual inspections is not only costly, but also too infrequent to cover all potential risk points, resulting in some safety hazards not being dealt with in a timely manner.

[0005] The existing similar detection devices have poor self-sustainability and reliability, and relatively single functions: Due to the objective factors such as extreme high and low temperatures, high humidity, vibration, flooding, etc. in the underground environment, the existing similar detection devices have false alarms and no alarms, and lack timely and effective feedback on the overall working status of the device, and the reliability of the detection data is poor. The existing similar detection devices also lack preliminary intelligent judgment of the data, and cannot provide decision makers with better and more effective decision-making information and suggestions.

[0006] These problems indicate that in terms of the safety management of urban underground infrastructure, it is urgent to introduce more advanced leak detection and gas monitoring technologies, and develop intelligent manhole cover solutions to improve safety prevention capabilities, so as to effectively prevent and reduce the occurrence of accidents and protect the lives and property of the public. Summary of the invention

[0007] The present invention provides a gas detection device and an intelligent monitoring method for gas in a pipeline, which aims to solve the problems of energy pipeline leakage in urban underground infrastructure and harmful gas volume accumulation in confined spaces, and timely detection and early warning. The technical solution is as follows: A gas detection device comprises a manhole cover, on the surface of which an energy collection device is provided; a box body assembly, comprising an upper box body and a lower box body that are detachably connected, and a receiving cavity is provided in the box body assembly; at least one gas detection unit is installed in the receiving cavity, and at least one air inlet is provided on the lower box body, corresponding to the gas detection unit; and a power supply module is electrically connected to the energy collection device and the gas detection unit.

[0008] Based on the above technical solution, a sealing gasket is arranged between the lower box body and the upper box body.

[0009] Based on the above technical solution, the manhole cover includes a cover body and a bottom ring, and the cover body and the bottom ring are detachably connected.

[0010] Furthermore, it also includes a solenoid valve for connecting or cutting off the passage between the air inlet and the gas detection unit. The lower box body is provided with a sensor for detecting whether the water level in the pipeline is about to reach the air inlet. The opening and closing of the solenoid valve is controlled by the sensor, and the solenoid valve is electrically connected to the power module.

[0011] An intelligent monitoring method for gas in a pipeline, using the above-mentioned gas detection device for monitoring, wherein the three gas detection units are divided into a first gas detection unit, a second gas detection unit and a third gas detection unit; The No. 1 gas detection unit first performs gas detection, and after detecting the gas data in the pipeline, obtains the first data; the No. 1 gas detection unit is closed; After a preset time, the second gas detection unit performs gas detection, and after detecting the gas data in the pipeline, obtains the second data; the second gas detection unit is turned off; Compare the first data with the second data, if the difference is small, then the third gas detection unit is no longer activated; If there is a large difference between the two numbers, it means that at least one set of data is wrong, then the No. 3 gas detection unit is turned on, and after detecting the gas data in the pipeline, the third data is obtained; the third data is compared with the first data and the second data, and two similar sets of data are selected and sent to the remote receiving end, and the fault information of the other data is sent together.

[0012] Beneficial Effects Compared with the prior art, the present invention has the following beneficial effects: on the one hand, it has a fault self-diagnosis function, and can effectively reduce the errors or false alarms that may occur in a single sensor by measuring three independent gas detection units respectively, and then comparing the consistency of the data, thereby greatly improving the accuracy and reliability of the detection results. On the other hand, through the triple moisture-proof measures of sealing design, solenoid valve control and moisture absorption module, it effectively prevents moisture from invading the interior of the device, ensuring that the gas detection unit works in a dry environment, thereby ensuring the reliability of the device and the measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only one embodiment of the present invention, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0014] Figure 1 : A schematic diagram of the structure of the gas detection device of the present invention; Figure 2 : Schematic diagram of the positions of the manhole cover and photovoltaic panels of the present invention; Figure 3 : A schematic diagram of the circuit structure of the present invention; Figure 4 : A schematic diagram of the structure of the manhole cover of the present invention; Figure 5 : Bottom view of the manhole cover of the present invention; Figure 6 : A schematic diagram of the structure of the flexible sleeve and the screw according to the present invention; Figure 7 : Schematic diagram of the composition of the gas detection unit described in the present invention. DETAILED DESCRIPTION

[0015] The present invention will be further described below in conjunction with the accompanying drawings and examples: Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0016] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0017] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0018] like Figure 1 and Figure 3 As shown, a gas detection device includes a manhole cover 1, an upper box body 2, a lower box body 3, three gas detection units 4, a signal processing unit 5, a communication unit 6 and a power module 7.

[0019] like Figure 2 As shown, an energy collection device 8 for power generation is installed on the top surface of the manhole cover 1, and the energy collection device 8 is at least one of a photovoltaic panel, a kinetic energy power generation module or a temperature difference power generation module.

[0020] The top surface of the manhole cover 1 may be provided with a sunken receiving groove for accommodating the photovoltaic panel, and the upper surface of the energy collection device 8 is flush with the upper surface of the manhole cover. By placing the energy collection device 8 in the sunken receiving groove and making its upper surface flush with the upper surface of the manhole cover, physical damage to the photovoltaic panel caused by external factors such as pedestrians stepping on it and vehicles running over it can be effectively reduced. This helps to extend the service life of the photovoltaic panel.

[0021] In order to further improve the wear resistance and scratch resistance of the manhole cover 1, preferably, a transparent protective layer can be coated on the surface after the photovoltaic panel 8 is arranged.

[0022] Specifically, the photovoltaic panel is attached to the back of the thicker double-layer tempered glass, so that the whole has a certain ability to resist pressure and external damage; the ductile iron manhole cover is appropriately thickened to reduce deformation; the photovoltaic tempered glass assembly can be made into a whole or divided into small pieces and laid at a preset position on the manhole cover, and the polyurethane material is used for the base and caulking and sealing. The overall plane is lower than the protruding upper plane of the manhole cover to further enhance the overall ability to resist external loads; the dedicated fixing structure makes the whole have reliable integrity and anti-slip properties; the double-layer tempered glass has high reliability, and even if the whole is broken, it will be in the shape of rounded slag, and the overall strength of the cast iron manhole cover will not be affected, and it will not cause safety hazards to the use environment. In summary, the manhole cover system has waterproof and explosion-proof properties and can meet the various capabilities that a simple manhole cover should have.

[0023] Setting the peak voltage of the photovoltaic panel to be lower than the safe maximum voltage of the battery can eliminate the need for a regulation group for the solar photovoltaic module input battery. By only controlling it with a unidirectional diode, the current can only flow from the photovoltaic module to the battery module and cannot flow back, thus avoiding the risk of overcharging.

[0024] It also includes system control. The output of the battery is controlled by the output control system. Set the minimum output voltage. When the battery voltage is higher than the "set minimum output voltage", the current can be output normally. When the battery voltage is lower than the "set minimum output voltage", the output current is stopped, so the battery will not have the risk of over-discharge. The output control system also has reverse connection protection, short circuit protection, and overload protection functions, which further enhances the overall safety performance.

[0025] When sunlight can directly shine on the manhole cover, the voltage generated by the photovoltaic panel is relatively large but will always be lower than the safe high voltage of the battery. When it is greater than the instantaneous voltage of the battery, the larger current generated will be directly and safely fed into the battery. When sunlight cannot directly shine on the manhole cover, the voltage generated by the scattered light is relatively low but will be higher than the "set minimum output voltage" of the battery. When it is lower than the instantaneous voltage of the battery, no current will be generated. When it is higher than the instantaneous voltage of the battery, the smaller current generated will be safely fed into the battery.

[0026] The upper box body 2 is fixedly connected to the bottom of the manhole cover 1, and the lower box body 3 is detachably connected to the upper box body 2. The lower box body 3 and the upper box body 2 enclose a receiving cavity, and three gas detection units 4, a signal processing unit 5, a communication unit 6 and a power module 7 are installed in the receiving cavity 20. The detachable connection between the lower box body 3 and the upper box body 2 facilitates the inspection, maintenance or replacement of various components installed in the receiving cavity, such as the gas detection unit 4, the signal processing unit 5, the communication unit 6, etc. Once a problem occurs in a component, the lower box body can be quickly disassembled for processing without moving the entire device or destroying the installation of the manhole cover.

[0027] A sealing gasket is provided between the lower box body 3 and the upper box body 2. The sealing gasket can effectively prevent external moisture and humidity from entering the accommodating cavity, which is essential for protecting the electronic components installed inside, such as the gas detection unit, the signal processing unit, the communication unit, etc., from the influence of the humid environment. Keeping the interior dry can avoid short circuits and other failures caused by moisture, thereby extending the service life of the equipment. The sealing gasket is made of rubber, such as silicone rubber or nitrile rubber, etc. Such materials have good elasticity and sealing properties, can effectively adapt to the slight unevenness between different materials, and provide reliable waterproof and dustproof effects.

[0028] The lower box body 3 is provided with three air inlets 30, and the three gas detection units 4 correspond one to one with the three air inlets 30. The photovoltaic panel 8 is electrically connected to the power module 7 via a cable passing through the manhole cover 1 and the upper box body 2, and the power module 7 is electrically connected to the three gas detection units 4, the signal processing unit 5, and the communication unit 6.

[0029] The gas detection unit 4 is directly responsible for analyzing the gas sample entering from the outside through the gas inlet 30, and monitoring the specific gas components and their concentrations. Each gas detection unit corresponds to an independent gas inlet one by one.

[0030] The signal processing unit 5 receives the data from the gas detection unit 4 and performs necessary processing on it, such as data format conversion, error correction and other operations, to ensure the accuracy and reliability of the output information.

[0031] The communication unit 6 is responsible for sending the processed information to the remote receiving end. This may involve wireless transmission technology, such as Wi-Fi, GPRS or other communication protocols suitable for underground environments. The communication unit ensures that the gas detection data can be transmitted to the monitoring center or relevant managers in a timely and accurate manner so that they can respond quickly.

[0032] It also includes a voltage acquisition component, and the battery voltage information is collected by the voltage acquisition component and remotely uploaded to the control end through the communication unit 6, so as to understand the working status of the system at any time. The voltage acquisition component adopts an existing component that can be obtained by those skilled in the art, and will not be described in detail here.

[0033] The power module 7 is the power source of the whole system. It not only provides a stable working voltage for the gas detection unit, the signal processing unit and the communication unit, but also realizes self-sufficient energy supply through the photovoltaic panel 8. The photovoltaic panel is installed on the top of the manhole cover 1, and is connected to the power module through cables passing through the manhole cover and the upper box body, forming a complete power supply link.

[0034] The power module 7 and the output system are sealed and packaged in an integral metal container, which is explosion-proof and waterproof. The energy collection device 8 is explosion-proof and waterproof as a whole. The two are mechanically connected by reliable bolts through the ribs under the manhole cover, and the circuits of the two are connected through reliable waterproof and explosion-proof joints.

[0035] like Figure 4 As shown, the manhole cover 1 includes a cover body 11 and a bottom ring 12, and the cover body 11 is detachably connected to the bottom ring 12. The bottom ring 12 is used to connect to the ground, and the bottom of the bottom ring 12 is connected to the upper box body 2, which facilitates the disassembly and assembly of the entire device.

[0036] The cover 11 and the bottom ring 12 are detachably connected, which makes it more convenient to install, debug or maintain the equipment. When it is necessary to inspect, repair or even replace the internal components of the lower box body 3, the upper box body 2 or the manhole cover itself, it is only necessary to remove the cover without moving the entire device, which greatly simplifies the operation process.

[0037] By designing the cover body and the bottom ring separately, the appropriate material and structure can be selected according to different application scenarios. For example, the weight can be reduced while ensuring strength, or the design of the bottom ring can be adjusted according to the specific conditions of the ground to adapt to different installation requirements.

[0038] It also includes a solenoid valve 50 for connecting or cutting off the passage between the air inlet 30 and the gas detection unit 4. The solenoid valve 50 is designed to be normally closed, that is, the passage between the air inlet 30 and the gas detection unit 4 is cut off by default, and is opened only when gas detection is required.

[0039] Keeping the solenoid valve 50 closed in the non-operating state can effectively prevent moisture, dust and other possible contaminants in the external environment from entering the gas detection unit through the air inlet. This is essential for maintaining a dry and clean working environment inside the device, helping to extend the service life of the device and ensure measurement accuracy.

[0040] The lower box body 3 is provided with a sensor 31 for detecting whether the water level in the pipeline is about to reach the air inlet 30 . The opening and closing of the solenoid valve 50 is controlled by the sensor 31 . The solenoid valve 50 is electrically connected to the power module 7 .

[0041] The sensor 31 is set to ultrasonic detection or touch detection to monitor the liquid distance or directly sense the presence of the liquid, and control the opening and closing of the solenoid valve 50 accordingly. When set as an ultrasonic detection sensor, it can work without direct contact with the liquid, so it will not be affected by the chemical properties of the liquid, reducing the risk of corrosion and contamination. When it is a touch detection sensor, once the liquid contacts the sensor, it will immediately trigger the solenoid valve 50 to close. The operation is intuitive and the response is fast, which is particularly suitable for situations that require a quick response.

[0042] The sensor 31 is used to monitor whether the water level in the pipeline is close to the air inlet 30. Once the water level is detected to be about to reach the air inlet, the sensor will immediately send a signal to the solenoid valve 50 to close it. This can effectively prevent moisture from entering the device through the air inlet and protect the gas detection unit 4 and other electronic components from water damage.

[0043] like Figure 6As shown, the upper box body 2 and the manhole cover 1 are detachably connected by a screw 61 with a flexible sleeve 60, the bottom of the manhole cover 1 extends downward to form a square connecting portion 10, the top of the upper box body 2 is installed in the space surrounded by the connecting portion 10, the connecting portion 10 has a through hole 10a, the upper box body 2 has a threaded hole corresponding to the through hole 10a, the screw 61 is threadedly connected to the threaded hole, and the flexible sleeve 60 mounted on the screw 61 is interference fit in the through hole 10a.

[0044] The flexible sleeve 60 can absorb vibration and impact to a certain extent, reducing the impact of external vibration on internal instruments. This is particularly important for equipment installed in busy traffic areas or underground pipelines because it can improve the stability and reliability of the system.

[0045] The use of the flexible sleeve 60 can fill the small gap between the screw 61 and the through hole 10a, providing an additional sealing layer, which helps prevent external pollutants such as water vapor and dust from entering the device through the connection part, thereby protecting the internal electronic components from damage.

[0046] The flexible sleeve 60 can be made of rubber or polyurethane. Polyurethane is known for its excellent wear resistance, tear resistance and good elastic recovery ability, and is suitable for application scenarios that require long-term sealing. It can also adjust the hardness according to specific needs to meet different usage requirements.

[0047] A moisture absorption module and a heating module for heating the moisture absorption module are provided on the passage between the solenoid valve 50 and the gas detection unit 4 , and the heating module is electrically connected to the power supply module 7 .

[0048] The moisture absorption module can be arranged on the heating module to dry the moisture absorption material wrapped outside the heating module. Moreover, as the temperature of the narrow space rises, the humidity of the air in the space is reduced. When the solenoid valve 50 is closed, the temperature drops, and the moisture absorption material can absorb the water vapor in the narrow space, thereby effectively reducing the humidity of the air in the narrow space. The working environment of the gas detection unit probe is effectively improved, and the effectiveness and reliability are improved.

[0049] There is high humidity in underground pipeline environments, which may affect the working performance of the gas detection unit or cause inaccurate measurement results. The moisture absorption module can absorb moisture from the incoming gas flow, ensuring that only dry gas samples reach the gas detection unit, thereby protecting it from the influence of moisture and maintaining high-precision detection capabilities.

[0050] The moisture absorption module can automatically absorb moisture from the incoming air flow during the operation of the gas detection unit, ensuring that only dry gas samples reach the gas detection unit. This method does not require an additional trigger mechanism, simplifies system design, and ensures the accuracy and reliability of gas detection.

[0051] The heating and moisture absorption module process does not require manual intervention, realizing automatic maintenance. This not only reduces maintenance costs, but also improves the availability and stability of the system.

[0052] An intelligent monitoring method for gas in a pipeline, using the above-mentioned gas detection device for monitoring: like Figure 7 As shown, the three gas detection units 4 are divided into a first gas detection unit 4-1, a second gas detection unit 4-2 and a third gas detection unit 4-3. When working: the first gas detection unit 4-1 first performs gas detection, and after detecting the gas data in the pipeline, obtains the first data such as the composition and concentration data of the gas, and the first gas detection unit 4-1 is turned off; After a preset time, the No. 2 gas detection unit 4-2 performs gas detection. After detecting the gas data in the pipeline, the second data is obtained. The No. 2 gas detection unit 4-2 is turned off and the two sets of data, the first data and the second data, are automatically compared. If they are basically the same, the No. 3 gas detection unit 4-3 is no longer turned on; for greater accuracy, a threshold value can be preset. If the difference value is less than the preset threshold value, the data is determined to be valid, and the No. 3 gas detection unit 4-3 is no longer turned on.

[0053] If there is a big difference between the two, and the difference value is greater than the preset threshold, it is determined that at least one set of data is abnormal. This means that at least one set of data in the No. 1 and No. 2 gas detection units is wrong, so the No. 3 gas detection unit 4-3 is turned on, and after detecting the gas data in the pipeline, the data obtained by the No. 3 gas detection unit 4-3 is compared with the first two sets of data.

[0054] If the difference between the third data and one of the sets of data is less than a preset threshold, the two sets of data are sent to the remote receiving end, and the detection unit corresponding to the other set of data is marked as faulty; If the difference between the third data and the first and second data exceeds the preset threshold, it is determined that the system has multiple anomalies, and all data and fault alarm information are sent to the remote receiving end.

[0055] If two sets of data are basically the same, then these two sets of data will be used as the basis to send to the remote receiving end, and if the faulty set of data is incorrect, then the fault information of which gas detection unit has occurred will be sent together.

[0056] By collecting data from multiple gas detection units and verifying each other, the problem of inaccurate data caused by errors or failures that may occur in a single sensor can be effectively reduced. This method significantly improves the reliability and accuracy of the final data.

[0057] Even if one or two of the gas detection units fail or give erroneous readings, the third gas detection unit can still provide correct measurements as a reference. This increases the fault tolerance of the system and ensures that effective monitoring information can still be obtained in the event of partial component failure.

[0058] When a large difference is found between the two sets of data, the system will automatically start the third gas detection unit for review and determine which set of data may have problems based on the consistency of the three sets of data. At the same time, the method can also automatically identify which gas detection unit may have a fault and send relevant information to the remote receiving end for timely maintenance and repair.

[0059] Preferably, an alarm unit is also included. When the data of the No. 1 and No. 2 gas detection units are very different, and the No. 3 gas detection unit determines that a certain set of data is wrong after detection, the signal processing unit 5 will send an alarm instruction to the alarm unit in addition to sending the correct data and fault information to the remote receiving end. After receiving the instruction, the alarm unit starts the alarm device and sends an audible and visual alarm signal. The alarm unit can set different levels of alarm thresholds.

[0060] By default, only two gas detection units are needed to complete routine monitoring tasks. The third gas detection unit will only be activated when two data are inconsistent and the difference is large. This method not only saves energy consumption, but also reduces unnecessary equipment wear and tear, extending the service life of the overall system.

[0061] When the sensor 31 detects that the water level in the pipeline is about to reach the air inlet 30 , all the solenoid valves 50 are controlled to be closed to prevent water from entering the accommodating chamber 20 .

[0062] When the gas detection unit 4 starts to perform gas detection, its corresponding moisture absorption module starts to work; when the gas detection unit 4 stops working, the heating module starts to work to heat and dehumidify the moisture absorption module.

[0063] By measuring three independent gas detection units 4-1, 4-2, and 4-3 respectively, and then comparing the consistency of the data, it is possible to effectively reduce the errors or false alarms that may occur in a single sensor, thereby greatly improving the accuracy and reliability of the detection results. If one or two of the gas detection units fail or give an erroneous reading, the third gas detection unit can still provide the correct measurement value as a reference. This design ensures that the system can still provide effective monitoring information even if some components fail. When the data of gas detection units No. 1 and No. 2 are consistent, there is no need to start gas detection unit No. 3, saving resources; when there is a large difference in the data, gas detection unit No. 3 is automatically started for review, and the final correct data is determined by the majority consistency principle, which enhances the self-verification ability of the system.

[0064] Strong protection design provides comprehensive protection for the gas detection device through triple moisture-proof measures of sealing, solenoid valve and moisture absorption module: Sealing design: A sealing pad is set between the lower box body 3 and the upper box body 2, which can effectively prevent water vapor and other impurities in the external environment from entering the device, ensuring that the internal electronic components are in a dry working environment. Solenoid valve control: When the sensor 31 detects that the water level in the pipeline is about to reach the air inlet 30, it will immediately close the solenoid valve 50, cut off the air intake path, and prevent moisture from entering the gas detection unit 4 through the air inlet. This provides an extra layer of protection to prevent any possible moisture from entering.

[0065] The moisture absorption module absorbs residual moisture: Even if a small amount of moisture enters the system through other channels, the moisture absorption module can further absorb the moisture to ensure that the gas sample is as dry as possible, thus not affecting the performance of the gas detection unit.

[0066] This device can effectively warn of explosion risks in underground spaces, including but not limited to rainwater, sewage, telecommunications, electricity, water supply, gas, and heating pipeline wells. The above spaces all have the following characteristics: first, the temperature difference changes greatly; second, the site conditions are poor, and rainy and snowy weather will have a greater impact, or even flood the entire space; third, the gas humidity is high and the composition is complex. The gas explosion risk detection device has high requirements for the environment, and the above unfavorable environment is prone to false alarms, no alarms, damage, etc. This device has a special targeted design and has high reliability. It can analyze the measured data change rate and derive subsequent development trends, such as the estimated time to reach the level of explosion, and provide more scientific warning information for the explosion risk warning of the space to be detected. If the explosion risk here is analyzed and evaluated in the early stage, specific measures can also be recommended.

[0067] Three groups of gas detection units are integrated in one detection device and work in turns. When one group of gas detection units detects a warning value, the second group of gas detection units is immediately turned on for re-testing. If a similar warning value is also measured, the data is judged to be true and reported immediately through the communication system. If the second group does not detect the warning value, the third group of gas detection units is immediately started, and the results are judged by the detection of the third group of detection components. This greatly improves the reliability and stability of the detection and can effectively reduce false alarms and non-reporting.

[0068] It should be noted that, in this embodiment, the gas detection unit, signal processing unit 5, communication unit 6, power module 7, solenoid valve 50, and sensor 31 are all universal standard parts or components known to those skilled in the art, and their structures and principles can be known to those skilled in the art through technical manuals or through conventional experimental methods.

[0069] The present invention is described above by way of examples, but the present invention is not limited to the above specific embodiments, and any changes or modifications made based on the present invention belong to the scope of protection claimed by the present invention.

Claims

1. A gas detection device, characterized in that: include: A manhole cover (1), the surface of which is provided with an energy collection device (8); A box body assembly comprises an upper box body (2) and a lower box body (3) which are detachably connected, and a containing cavity is arranged in the box body assembly; At least one gas detection unit (4) installed in the accommodating cavity; At least one gas inlet (30) is provided on the lower box body (3) and corresponds to the gas detection unit (4); The power module (7) is electrically connected to the energy collection device and the gas detection unit (4).

2. A gas detection device according to claim 1, characterized in that The energy collection device (8) is at least one of a photovoltaic panel, a kinetic energy power generation module or a temperature difference power generation module.

3. A gas detection device according to claim 1, characterized in that A sealing gasket is provided between the lower box body (3) and the upper box body (2).

4. A gas detection device according to claim 1, characterized in that The manhole cover (1) comprises a cover body (11) and a bottom ring (12), and the cover body (11) and the bottom ring (12) are detachably connected.

5. A gas detection device according to claim 1, characterized in that The invention also includes a solenoid valve (50) for connecting or disconnecting a passage between the air inlet (30) and the gas detection unit (4); the lower box body (3) is provided with a sensor (31) for detecting whether the water level in the pipeline is about to reach the air inlet (30); the opening and closing of the solenoid valve (50) is controlled by the sensor (31); and the solenoid valve (50) is electrically connected to a power supply module (7).

6. A gas detection device according to claim 1, characterized in that: The upper box body (2) and the manhole cover (1) are detachably connected via a screw (61) with a flexible sleeve (60); the bottom of the manhole cover (1) extends downward to form a square connection portion (10); the top of the upper box body (2) is installed in a space surrounded by the connection portion (10); the connection portion (10) has a through hole (10a); the upper box body (2) has a threaded hole corresponding to the through hole (10a); the screw (61) is threadedly connected to the threaded hole; and the flexible sleeve (60) sleeved on the screw (61) is interference-fitted in the through hole (10a).

7. A gas detection device according to claim 4, characterized in that A moisture absorption module and a heating module for heating the moisture absorption module are provided on the passage between the solenoid valve (50) and the gas detection unit (4), and the heating module is electrically connected to the power supply module (7).

8. A method for intelligently monitoring gas in a pipeline, using a gas detection device as claimed in any one of claims 1 to 7 for monitoring, characterized in that : The gas detection unit (4) comprises a first gas detection unit (4-1), a second gas detection unit (4-2) and a third gas detection unit (4-3); The first gas detection unit (4-1) performs gas detection, detects gas data in the pipeline, and obtains first data; the first gas detection unit (4-1) is turned off; After a preset time, the second gas detection unit (4-2) performs gas detection to detect gas data in the pipeline and obtain second data; the second gas detection unit (4-2) is turned off; Comparing the first data with the second data, if the difference is less than a preset threshold, the data is determined to be valid, and the third gas detection unit is no longer turned on (4-3); If the difference value is greater than a preset threshold, it is determined that at least one set of data is abnormal, and the third gas detection unit (4-3) is turned on to detect the gas data in the pipeline to obtain third data; Then compare the third data with the first data and the second data respectively: If the difference between the third data and one of the sets of data is less than a preset threshold, the two sets of data are sent to the remote receiving end, and the detection unit corresponding to the other set of data is marked as faulty; If the difference between the third data and the first and second data exceeds the preset threshold, it is determined that the system has multiple anomalies, and all data and fault alarm information are sent to the remote receiving end.

9. The method for intelligently monitoring gas in a pipeline according to claim 7, characterized in that When the sensor (31) detects that the water level in the pipeline is about to reach the air inlet (30), all the solenoid valves (50) are controlled to close to prevent water from entering the accommodating chamber (20).

10. The method for intelligently monitoring gas in a pipeline according to claim 7, characterized in that When the gas detection unit (4) starts to detect gas, its corresponding moisture absorption module starts to work; when the gas detection unit (4) stops working, the heating module starts to work to heat and dehumidify the moisture absorption module.

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