A gas detection box

Abstract

The utility model provides a kind of gas detection box, including box, gas inlet, gas outlet and control panel are provided on box, gas detection unit and gas conveying unit are provided in box;The gas detection unit includes gas sensor group;The gas conveying unit includes gas conveying pipeline and the control valve and gas conveying pump being set on gas conveying pipeline, and the gas sensor group, gas conveying pump and control valve are electrically connected with control panel;The gas conveying pipeline includes gas inlet pipeline and gas outlet pipeline, and it further includes cleaning pipeline, the gas inlet end of cleaning pipeline is communicated with outside air, and the gas outlet end is accessed into the detection bin of gas sensor group, and cleaning pipeline is provided with cleaning pneumatic valve.The utility model is flushed to the gas sensor detection bin after completing once detection by setting cleaning pipeline, and improves detection precision and reliability.

Description

Technical Field

[0001] This utility model relates to the field of gas detection, specifically to a gas detection box. Background Technology

[0002] Fumigation is a method of grain storage that uses chemical agents to inhibit the life activities of the grain itself and microorganisms, thereby extending the storage time. Currently, the grain fumigation industry requires the simultaneous monitoring of the concentrations of phosphine, oxygen, and carbon dioxide gases in the warehouse.

[0003] Currently, there are corresponding gas detection devices in the existing technology. For example, patent CN208297471U discloses a grain warehouse gas detection box, which includes a box body. The rear wall of the box body is provided with a power socket, an exhaust pipe interface, and several air inlet pipe interfaces. Inside the box body are a vacuum pump, a controller, a gas sensor box, a multi-port pipe, and solenoid valves corresponding to the air inlet pipe interfaces. The multi-port pipe, gas sensor box, vacuum pump, and exhaust pipe interfaces are connected sequentially through rubber tubes. The controller is equipped with a display screen. The multiple air inlet pipe interfaces can collect and detect gases from multiple locations in the grain warehouse, achieving comprehensive detection. Toxic gases in the grain warehouse are directly discharged back into the grain warehouse after being detected by the detection box, preventing toxic gases from escaping outside the warehouse and achieving detection safety.

[0004] Although the aforementioned detection box can detect the gas concentration inside the chamber, gas may remain in the gas sensor box after one cycle of detection. This not only affects the accuracy of the next detection but also has a long-term impact on the lifespan of the sensor. Utility Model Content

[0005] This invention aims to solve the problem of insufficient detection accuracy in existing gas detection boxes. It proposes a gas detection box that improves detection accuracy and reliability by rinsing the gas sensor detection chamber after a single test through a cleaning pipeline.

[0006] To achieve the above-mentioned objectives, the technical solution of this utility model is as follows: A gas detection box includes a box body with an inlet port, an outlet port, and a control panel. Inside the box body are a gas detection unit and a gas delivery unit. The gas detection unit includes a gas sensor array. The gas delivery unit includes a gas delivery pipeline, a control valve, and a gas delivery pump mounted on the pipeline. The gas sensor array, gas delivery pump, and control valve are all electrically connected to the control panel. The gas delivery pipeline includes an inlet pipe, a cleaning pipe, and an outlet pipe. The inlet port has multiple outlets corresponding to different gas collection channels. Multiple inlet pipes are connected to the inlet ports one-to-one, and each inlet pipe has a separate detection pneumatic valve. The inlet end of the cleaning pipe is connected to the outside air and has a cleaning pneumatic valve. The outlet ends of both the cleaning pipe and the inlet pipe are connected to the detection chamber of the gas sensor array. The two ends of the outlet pipe are connected to the gas sensor array and the outlet port, respectively.

[0007] Preferably, the control panel includes a control motherboard and an electrically connected LCD touchscreen, control buttons, and operation indicator lights; the LCD touchscreen is used to set the number of gas collection channels, channel exhaust time, collection time, and timed collection time parameters, and displays the gas concentration value, collection time period, and detection time information for each gas collection channel after collection is completed; the control buttons include a collection button, an exit button, and an exhaust button, the collection button is used to start the normal detection program, the exit button is used to exit the current working mode and restore the initial state, and the exhaust button is used to draw in external air to exhaust the detection chamber in the gas sensor group in the initial state.

[0008] Preferably, the control motherboard is also connected to an AC-DC switching power supply and a 4G module. The AC-DC switching power supply is connected to the power grid through a circuit breaker to supply power to the entire device, and the 4G module is used to upload the detection data to the management platform.

[0009] Preferably, the air intake pipe is also connected to a flow regulation module, which is connected to the control panel.

[0010] Preferably, the gas sensor group includes multiple sensors for detecting different gas types, and each sensor is detachably connected to a base inside the housing.

[0011] Preferably, the gas sensor group is equipped with a high-range sensor and a low-range sensor for detecting the same type of gas. Both the high-range sensor and the low-range sensor are connected to the air inlet pipe, and a switching valve is provided at the connection junction to switch between the high and low ranges.

[0012] Preferably, the bottom of the housing is equipped with casters, and a pull rod is provided on one side of the housing; the LCD touch screen, control buttons and operation indicator lights of the control panel are located on the top of the housing, and a transparent protective cover is also provided outside the LCD touch screen. The workflow of this utility model is as follows: Install the gas detection box in place and connect the gas duct. Turn on the device through the circuit breaker switch. After powering on, the display interface will appear and preheating will begin. The preheating time is about 30 seconds. After preheating, the device can be manually collected by control button 6, or configured for timed / period-time automatic collection and collection by sending commands through the mini-program via the LCD touch screen 4. After the detection is started, the detection pneumatic valve 7 is opened and closed in a cycle according to the user-defined or default settings to gradually complete the gas concentration detection of each gas collection channel. The detection results are displayed and uploaded in real time. After each cycle of channel gas detection is completed, the detection pneumatic valve 7 is closed and the cleaning pneumatic valve is started to open the cleaning pipeline, draw in air, and clean the residual gas in the sensor gas chamber. After the test is completed, the LCD touch screen 4 displays information such as the gas concentration value, collection time period, and test time for each gas collection channel, and uploads it to the management platform in real time through the 4G module 18. By analyzing the test data, early warning can be issued for gas concentrations exceeding the limit.

[0013] In summary, this utility model has the following advantages: 1. The gas detection box of this utility model, by setting up a cleaning pipe and a cleaning pneumatic valve, can draw in external air to the sensor after completing one cycle of detection, flush and exhaust the internal environment of the sensor, so as to avoid affecting subsequent detection. While improving the accuracy of the next detection, it can also protect the sensor and extend its service life. 2. This utility model can realize automatic, manual, timed, and periodic gas detection operation modes through the control panel. It can collect gas manually or control the collection according to the timed and periodic operation modes, which provides convenience for the detection personnel. 3. In this utility model, parameters such as the number of gas collection channels, channel exhaust time, collection time, and timed collection time can be set through the control panel. After collection, the gas concentration value, collection time period, and detection time information of each gas collection channel can be displayed. The collected data can also be uploaded to the management platform through the 4G module, so as to better analyze and monitor the gas concentration in the chamber. 4. This utility model adopts a pull-out box design, which is convenient for moving between different detection targets and reduces the workload of users; the LCD touch screen is designed with a transparent protective cover to provide a safety protection effect. 5. In this utility model, the gas sensor group is equipped with high and low range sensors for the detection of the same gas type. The high and low ranges can be switched by a switching valve according to the detection requirements, which can better adapt to the detection needs and improve the detection accuracy. 6. In this utility model, the sensors in the gas sensor group are designed with a pluggable structure, which can change the type of sensor and increase or decrease the number of sensors according to the measurement requirements, thereby expanding the application range of the detection box. 7. In this utility model, a flow regulation module is provided on the air inlet pipe to control the flow rate so that the detected gas can meet the technical requirements of the sensor test. 8. In this utility model, the control motherboard is connected to a filter to filter out electromagnetic interference signals, thereby improving the anti-interference capability and high reliability of the detection box. Attached Figure Description

[0014] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments, wherein: Figure 1 This is a control principle diagram of the gas detection box of this utility model; Figure 2 This is a schematic diagram of the overall structure of the gas detection box of this utility model; Figure 3 This is a left view of the gas detection box of this utility model; Figure 4 This is a right view of the gas detection box of this utility model; Figure 5 A schematic diagram of the internal structure of the gas detection box of this utility model (connecting pipelines are not shown). In the picture: 1. Cabinet; 3. Control Mainboard; 4. LCD Touch Screen; 5. Operation Indicator Light; 6. Control Buttons; 7. Detection Pneumatic Valve; 8. Flow Restrictor Valve; 9. Gas Delivery Pump; 10. Gas Sensor Group; 11. Inlet Port; 12. Outlet Port; 14. Pull Rod; 15. Casters; 16. Transparent Protective Cover; 17. Filter; 18. 4G Module; 19. Power Supply; 20. Exhaust Valve; 21. Two-in-one-out Solenoid Valve. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0016] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0017] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0018] In the description of this utility model, it should be noted that the terms "upper," "vertical," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0019] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] Example 1 This utility model proposes a gas detection box, such as Figures 2 to 5 As shown, the device includes a housing 1, which has an air inlet 11, an air outlet 12, and a control panel. Inside the housing 1 are a gas detection unit and a gas delivery unit. The gas detection unit includes a gas sensor group 10. The gas delivery unit includes a gas delivery pipeline, a control valve mounted on the gas delivery pipeline, and a gas delivery pump 9. The gas sensor group 10, the gas delivery pump 9, and the control valve are all electrically connected to the control panel.

[0021] In this design, the gas delivery pipeline includes an inlet pipe, an outlet pipe, and a cleaning pipe. The housing 1 has multiple inlet ports 11, corresponding to multiple gas collection channels. Multiple inlet pipes are provided, with their inlet ends connected one-to-one to the inlet ports 11. Each inlet pipe is equipped with a separate detection pneumatic valve 7 to control the opening and closing of that gas collection channel. The outlet end of the inlet pipe connects to the detection chamber of the gas sensor group 10. In this design, there are 10 inlet ports 11, each corresponding to a different detection point within the detection chamber. By controlling the detection pneumatic valve 7 on each inlet pipe, the gas concentration at the specified detection point within the detection chamber can be obtained.

[0022] The gas outlet pipe is connected to the gas sensor assembly 10 and the gas outlet interface 12 at both ends, respectively, for discharging the detected gas. An exhaust valve 20 is installed on the gas outlet pipe. To improve environmental friendliness, the gas outlet interface 12 can be connected to an external waste gas treatment device, allowing the toxic detected gas to be treated to render it harmless before being discharged.

[0023] To improve detection accuracy, this solution includes a cleaning pipeline equipped with a pneumatic cleaning valve. The inlet of the cleaning pipeline connects to outside air, while the outlet connects to the detection chamber of the gas sensor assembly 10. After each detection, opening the cleaning pipeline to allow outside air in cleans the residual gas in the detection chamber, improving the accuracy of subsequent detections and protecting the sensor, thus extending its lifespan. In actual installation, the outlets of the cleaning pipeline and the inlet pipeline can be connected to a two-inlet, one-outlet solenoid valve 21, which is then connected to the detection chamber of the gas sensor.

[0024] Preferably, a flow regulation module is also installed on the air intake pipe. The flow regulation module is connected to the control panel to control the gas flow rate, thereby meeting the technical requirements of sensor testing. In this solution, the flow regulation module is a flow limiting valve 8.

[0025] Preferably, the gas delivery pump 9 in this solution is a self-priming vacuum pump.

[0026] like Figure 1 As shown, the control panel includes a power supply 19, a control motherboard 3, an LCD touchscreen 4, control buttons 6, and a running indicator light 5. The LCD touchscreen 4, control buttons 6, and running indicator light 5 are electrically connected to the control motherboard 3. The LCD touchscreen 4 allows users to set parameters such as the number of gas collection channels, channel exhaust time, collection time, and timed collection time. After collection is complete, the LCD touchscreen 4 displays information such as the gas concentration value of each channel, the collection time period, and the detection time.

[0027] Control button 6 includes a data acquisition button, an exit button, and an exhaust button. Pressing the data acquisition button allows for the sequential acquisition of gas concentration data from each gas acquisition channel in a set order. Pressing the exit button exits the current operating mode and restores the initial state. Pressing the exhaust button, in the initial state, draws in external air to the sensor for exhaust. The operation indicator light 5 indicates the current detection status; a flashing light indicates normal operation, while an off or constantly lit light indicates a malfunction.

[0028] The gas sensor assembly 10 includes multiple gas sensors for detecting different gas types, each detachably connected to a base inside the housing 1. For example, three sensors can be set up for nitrogen, phosphine, and carbon dioxide in a grain silo. Since this invention can also be used for gas concentration testing in other sealed chambers, the sensors are designed to be pluggable for better configuration and installation, allowing for the addition or removal of the number of sensors and the replacement of sensor types according to detection requirements.

[0029] Preferably, in this solution, the gas sensor is a pump-suction electrochemical sensor. The pump-suction electrochemical sensor utilizes the constant voltage electrolysis principle. When gas is drawn into the sensor's gas chamber through a pump, the sensor undergoes a redox reaction and outputs a current signal. This signal is directly proportional to the concentration of the gas being measured. After processing, this current signal is displayed on the LCD touchscreen 4 or uploaded to a data center via a 4G network.

[0030] In this solution, the control motherboard 3 includes an ARM core circuit, an I / O input / output circuit, and an isolated RS485 interface circuit. The I / O input / output circuit is used for human-machine interaction and controlling the solenoid valve; the isolated RS485 interface circuit is used to communicate with the gas detection sensor to obtain gas concentration detection values ​​and perform sensor calibration; the ARM core circuit is connected to the CAN bus circuit to enable networking of multiple devices in the field and access to historical detection data.

[0031] Furthermore, the enclosure 1 also houses an AC-DC switching power supply 19 and a 4G module 18. The AC-DC switching power supply 19 is connected to the power grid via a circuit breaker switch to power the entire testing device. The 4G module 18 is connected to the control motherboard 3 and uploads the testing data to the management platform via the 4G module 18 located outside the enclosure 1.

[0032] Furthermore, to prevent electromagnetic interference, the control motherboard 3 in this solution is also connected to a filter 17, which is used to filter out electromagnetic interference signals in the detection signals of the gas sensor group 10, thereby further improving the accuracy of the detection data.

[0033] Example 2 Based on Example 1, this example further describes the structure of the housing 1.

[0034] Furthermore, in this design, to prevent reaction with the gas to be detected, the housing 1 is made of a material that does not readily react with the gas, such as stainless steel or acrylic sheet. To facilitate the transfer of the testing box, casters 15 are installed at the bottom of the housing 1, and a pull rod 14 is installed on one side of the housing 1.

[0035] Preferably, the touch screen, control buttons 6, and operation indicator lights 5 of the control panel are located on the top of the housing 1, while the control motherboard 3 is located inside the housing 1. A transparent protective cover 16 is also provided on the outside of the touch screen for safety protection.

[0036] Example 3 Based on any of the above embodiments, this embodiment makes further improvements to the gas sensor group 10.

[0037] To further improve the sensitivity and accuracy of sensor measurements, this solution sets up high-range and low-range sensors for the detection of the same gas type. Both the high-range and low-range sensor groups are connected to the air intake pipe, and a switching valve is set at the intersection of the branch lines. The switching valve can be used to switch between sensors with different ranges for detection, thereby better adapting to the detection requirements.

[0038] The workflow of this utility model is as follows: Install the gas detection box in place and connect the gas duct. Turn on the device through the circuit breaker switch. After powering on, the display interface will appear and preheating will begin. The preheating time is about 30 seconds. After preheating, the device can be manually collected by control button 6, or configured for timed / period-time automatic collection and collection by sending commands through the mini-program via the LCD touch screen 4. After the detection is started, the detection pneumatic valve 7 is turned on and off in a cycle according to the user-defined or default settings to gradually complete the gas concentration detection of each gas collection channel. The detection results are displayed and uploaded in real time. After each cycle of channel gas detection is completed, the detection pneumatic valve 7 is closed, the cleaning pneumatic valve is turned on, the cleaning channel is opened, air is drawn in, and the gas to be measured remaining in the sensor gas chamber is cleaned. After the test is completed, the LCD touch screen 4 displays information such as the gas concentration value, collection time period, and test time for each gas collection channel, and uploads it to the management platform in real time through the 4G module 18. By analyzing the test data, early warning can be issued for gas concentrations exceeding the limit.

[0039] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A gas detection box, comprising a box body (1), wherein an air inlet (11), an air outlet (12), and a control panel are provided on the box body (1), and a gas detection unit and a gas delivery unit are provided inside the box body (1); the gas detection unit includes a gas sensor group (10); the gas delivery unit includes a gas delivery pipeline and a control valve and a gas delivery pump (9) provided on the gas delivery pipeline, wherein the gas sensor group (10), the gas delivery pump (9), and the control valve are all electrically connected to the control panel; characterized in that, The gas delivery pipeline includes an inlet pipe, a cleaning pipe, and an outlet pipe. The inlet interface (11) is provided with multiple corresponding gas collection channels. The inlet pipe is provided with multiple pipes and is connected to the multiple inlet interfaces (11) one by one. Each inlet pipe is provided with a separate detection pneumatic valve (7). The inlet end of the cleaning pipe is connected to the outside air. The cleaning pipe is provided with a cleaning pneumatic valve. The outlet ends of the cleaning pipe and the inlet pipe are connected to the detection chamber of the gas sensor group (10). The two ends of the outlet pipe are connected to the gas sensor group (10) and the outlet interface (12) respectively.

2. A gas detection box as described in claim 1, characterized in that, The control panel includes a control motherboard (3) and an electrically connected LCD touch screen (4), control buttons (6) and a running indicator (5); the LCD touch screen (4) is used to set the number of gas collection channels, channel exhaust time, collection time, and timed collection time parameters, and displays the gas concentration value, collection time period, and detection time information of each gas collection channel after collection is completed; the control buttons (6) include a collection button, an exit button, and an exhaust button.

3. A gas detection box as described in claim 2, characterized in that, The control motherboard (3) is also connected to an AC-DC switching power supply (19) and a 4G module (18); the AC-DC switching power supply (19) is connected to the power grid through a circuit breaker switch to supply power to the entire device; the 4G module (18) is used to upload the detection data to the management platform.

4. A gas detection box as described in claim 1, characterized in that, The intake pipe is also connected to a flow regulation module, which is connected to the control panel.

5. A gas detection box as described in claim 1, characterized in that, The gas sensor group (10) includes multiple sensors for detecting different types of gas, each of which is detachably connected to a base inside the housing (1).

6. A gas detection box as described in claim 1 or 5, characterized in that, The gas sensor group (10) is equipped with a high-range sensor and a low-range sensor for detecting the same type of gas. Both the high-range sensor and the low-range sensor are connected to the air inlet pipe, and a switching valve is set at the connection junction to switch between high and low ranges.

7. A gas detection box as described in claim 2, characterized in that, The bottom of the box (1) is provided with casters (15), and a pull rod (14) is provided on one side of the box (1); the LCD touch screen (4), control buttons (6) and running indicator (5) of the control panel are located on the top of the box (1), and a transparent protective cover (16) is also provided outside the LCD touch screen (4).

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