In-well multi-point gas detection device

Abstract

The embodiment of the utility model relates to the technical field of engineering detection, and discloses an in-well multi-point gas detection device. The in-well multi-point gas detection device comprises a gas detector, a deflation brake and three ventilation hoses, the three ventilation hoses are communicated with the deflation brake, and the deflation brake is used for controlling opening or closing of a gas passage between the three ventilation hoses and the gas detector; the deflation brake is connected with the gas detector; the lengths of the three ventilation hoses are different, and the diameters of the three ventilation hoses are equal. According to the in-well multi-point gas detection device, whether toxic and harmful gas exists in multiple detection points in a manhole or not can be measured by adjusting the device once, and the detection efficiency and the position precision are improved.

Description

Technical Field

[0001] This application relates to the field of engineering testing technology, and in particular to a multi-point gas detection device in a well. Background Art

[0002] In construction projects, especially those involving the relocation of communication pipelines, vertical passages are often excavated at intervals to facilitate power maintenance and wiring, forming manholes for workers to access the site. Because these manholes are typically closed, the air composition differs from the atmosphere and may contain toxic or harmful gases. Therefore, before workers enter the manhole, the manhole cover must be opened for ventilation, and the air quality must be tested using a toxic gas detection device to ensure it meets the standards for manhole access. Prior to entering the manhole, multiple gas levels at different locations within the manhole should be tested.

[0003] However, the inventors have discovered that existing toxic and harmful gas detection devices can only detect gas at one detection point at a time. When detecting different detection points, engineers need to manually adjust the length of the device's ventilation hose to the next detection point before proceeding with further detection. However, adjusting the hose length each time makes the detection process cumbersome and reduces efficiency; furthermore, length errors are easily introduced during adjustment, leading to discrepancies between the measured detection point and the actual detection location. Therefore, a multi-point gas detection device for wells that can improve detection efficiency and positional accuracy is needed. Utility Model Content

[0004] The purpose of this application is to provide a multi-point gas detection device in a well, which allows for the measurement of the presence of toxic and harmful gases at multiple detection points in the well with a single adjustment of the device, thereby improving detection efficiency and location accuracy.

[0005] To address the aforementioned technical problems, embodiments of this application provide a multi-point gas detection device for wells, comprising: a gas detector, a venting valve, and three ventilation hoses; the three ventilation hoses are connected to the venting valve, which controls the opening or closing of the gas passage between the three ventilation hoses and the gas detector; the venting valve is connected to the gas detector; the three ventilation hoses have different lengths and equal diameters.

[0006] Compared to existing technologies, this application's implementation uses a venting valve connected to a gas detector to open and close the gas passage. Three ventilation hoses are connected to the venting valve, which controls the release of gas from the three hoses. This allows for direct testing of the presence of toxic or harmful gases at three different heights within a manhole in a single test, eliminating the need for hose length adjustments. This single adjustment enables multi-point testing, improving the efficiency of gas detection in the manhole. Furthermore, the different lengths of the three ventilation hoses indicate varying detection heights within the manhole. The hose lengths can be set according to requirements, eliminating the need for hose length adjustments after testing a single point. This improves the accuracy of detection points, thereby enhancing both the efficiency and precision of detecting toxic or harmful gases in the manhole.

[0007] In addition, the venting valve includes a control motor, a baffle plate, a venting valve inlet, and a venting valve outlet; the venting valve inlet has three branches; each branch is connected to a ventilation hose; the baffle plate is located between the branch of the venting valve inlet and the venting valve outlet; the venting valve outlet is connected to the gas detector; the control motor is connected to the baffle plate and is used to control the movement of the baffle plate. This embodiment sets the number of venting valve branches to match the number of ventilation hoses, thus achieving a one-to-one correspondence between ventilation hoses and venting valve branches. The motor-controlled baffle plate allows for the opening or closing of multiple branches, enabling simultaneous detection of gas from multiple ventilation hoses and improving gas detection efficiency.

[0008] Furthermore, the widths of the three branches are all equal; the baffles include a left baffle and a right baffle, and the control motor is connected to the left baffle and the right baffle respectively; the interval between the left baffle and the right baffle is equal to the width of the branch. This embodiment of the application sets the interval between the left and right baffles to the width of one branch, allowing one branch to be controlled at a time, connecting the ventilation hose to the gas detector to form a gas passage. This avoids gas mixing caused by multiple ventilation hoses connected to the vent valve, thereby improving the accuracy of multi-point detection results.

[0009] Furthermore, when the control motor moves the baffle, it simultaneously controls the left and right baffles to move in the same direction. This embodiment of the application ensures that the distance between the left and right baffles remains consistent and equal to the branch width by simultaneously controlling the left and right baffles to move in the same direction, thus maintaining a gas passage that can form one branch at a time.

[0010] Furthermore, the maximum distance the baffle can move in the same direction is twice the width of the branch; when the baffle moves to the maximum distance in the same direction, the control motor switches its direction to the opposite direction. This embodiment of the application, by limiting the maximum distance the baffle can move in the same direction to twice the width of the branch, can limit the movement distance of the baffle, preventing it from moving out of the vent valve and causing leakage, and reducing the impact of external gas on the accuracy of gas detection.

[0011] Furthermore, the baffle is a metal baffle; a metal coil is wound around the branch wall of the vent valve inlet branch, and the metal coil is connected to a power supply; after the control motor controls the baffle to move, the power supply energizes the metal coil, and the magnetic force generated by the energization attracts the baffle, closing the gas path that does not need to be detected. This embodiment of the application achieves this by winding a metal coil connected to a power supply around the branch, so that the magnetic force generated by the energization can attract the metal baffle, thereby closing the branch that does not need to be detected, leaving only the branch that needs to be detected open, thus forming a gas passage for detection. The electromagnetic force attracts the metal baffle to close the gas path that does not need to be detected, which helps to reduce gas mixing caused by other passages connecting to the vent valve, making the gas detection results more accurate.

[0012] In addition, the outermost layer of the baffle is an insulating layer. Since this application uses the magnetic force generated by energizing to attract the metal baffle and close the branch, in order to avoid the metal baffle becoming difficult to move after being attracted and to prevent the metal baffle from damaging the control motor when energized, the embodiment of this application adds an insulating layer to the outermost layer of the metal baffle, so that the metal baffle can still move normally after being attracted by electromagnetic force, and avoids electrical damage to the control motor caused by the metal baffle being energized.

[0013] In addition, the device also includes a detection result recording module; the detection result recording module includes a data group recording submodule and a result recording submodule; wherein, the data group recording submodule is connected to the control motor and calculates the currently measured branch based on the number of forward and reverse rotations of the control motor; the result recording submodule is connected to the gas detector and records the gas detection results.

[0014] Furthermore, the width of the branch is equal to the width of the vent valve outlet. In this embodiment, by setting the width of the branch to be equal to the width of the vent valve outlet, and ensuring that the width of the vent valve outlet leading to the gas detector is the same as the width of the branch of the vent valve, the inlet and outlet gas pressures are equal, thus preventing pressure differentials from damaging the detection instrument.

[0015] In addition, the length differences of the three ventilation hoses are equal, and the ratio of the length difference between the ventilation hoses to the total length of the manhole is in the range of 1:3 to 1:5. Attached Figure Description

[0016] One or more embodiments are illustrated by way of example with reference to the accompanying drawings, and these illustrative descriptions do not constitute a limitation on the embodiments.

[0017] Figure 1 This is a schematic diagram of the overall structure of the multi-point gas detection device provided in the embodiments of this application;

[0018] Figure 2 This is a schematic diagram of the baffle position when the venting gate of the device provided in this application detects the rightmost branch;

[0019] Figure 3 This is a schematic diagram of the baffle position when the venting gate of the device provided in this application detects the intermediate branch;

[0020] Figure 4 This is a schematic diagram of the baffle position when the venting gate of the device provided in this application detects the rightmost branch. DETAILED DESCRIPTION

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the various embodiments of this application will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this application to help readers better understand this application. However, the technical solutions claimed in this application can be implemented even without these technical details and various changes and modifications based on the following embodiments. The division of the various embodiments below is for the convenience of description and should not constitute any limitation on the specific implementation of this application. The various embodiments can be combined with and referenced by each other without contradiction.

[0022] The first embodiment of this utility model relates to a multi-point gas detection device in a well, which can be applied to engineering projects involving the relocation of communication pipelines. The core of this embodiment is that the multi-point gas detection device in the well includes a gas detector, a vent valve, and three ventilation hoses; the three ventilation hoses are connected to the vent valve, which controls the opening or closing of the gas passage between the three ventilation hoses and the gas detector; the vent valve is connected to the gas detector; the three ventilation hoses have different lengths and equal diameters. The gas passage is opened and closed by a venting valve connected to a gas detector. Three ventilation hoses are connected to the venting valve, and the venting valve controls the release of gas from the three hoses. This allows for direct testing of the presence of toxic or harmful gases at three different heights within a manhole in a single test, eliminating the need for adjustments to the hose lengths. This single adjustment enables multi-point testing, improving the efficiency of gas detection in manholes. Furthermore, the different lengths of the three ventilation hoses indicate different detection heights within the manhole. The lengths of the hoses can be set according to requirements, eliminating the need for adjustments after testing each point, thus improving the accuracy of detection points. This enhances both the efficiency and precision of detecting toxic or harmful gases in manholes. The following details the implementation of this multi-point gas detection device in a manhole. These details are provided for ease of understanding and are not essential for implementing this solution.

[0023] This embodiment relates to a multi-point gas detection device in a well, such as... Figure 1 As shown, the specific structure includes the following: a gas detector, a vent valve, and three ventilation hoses; the three ventilation hoses are connected to the vent valve, which controls the opening or closing of the gas passage between the three ventilation hoses and the gas detector; the vent valve is connected to the gas detector; the three ventilation hoses have different lengths and equal diameters. It should be noted that the number of ventilation hoses can be flexibly adjusted according to actual engineering or operational needs, and is not limited to three. Furthermore, the diameter of the ventilation hoses can also be adjusted accordingly based on actual engineering or operational needs; no restrictions are imposed here.

[0024] In some example implementations, the width of the branch is equal to the width of the vent valve outlet. This embodiment sets the width of the branch to be equal to the width of the vent valve outlet, ensuring that the width of the vent valve outlet leading to the gas detector is the same as the width of the branch to the vent valve. This makes the inlet and outlet gas pressures equal, preventing pressure differentials from damaging the detection instrument.

[0025] In some example implementations, the device further includes a detection result recording module; the detection result recording module includes a data group recording submodule and a result recording submodule; wherein, the data group recording submodule is connected to the control motor and calculates the currently measured branch based on the number of forward and reverse rotations of the control motor; the result recording submodule is connected to the gas detector and records the gas detection results. This embodiment of the application, by using a detection result recording module to calculate the currently measured branch based on the number of forward and reverse rotations of the control motor and record the corresponding gas detection results, achieves accurate recording of multiple sets of data from multiple points of detection. In the case of performing multiple points of detection at once, there is no need for manual recording of the detected branches and corresponding detection results, saving labor costs and improving detection efficiency.

[0026] In some example implementations, the venting valve includes a control motor, a baffle plate, a venting valve inlet, and a venting valve outlet; the venting valve inlet has three branches; each branch is connected to a ventilation hose; the baffle plate is located between the branch of the venting valve inlet and the venting valve outlet; the venting valve outlet is connected to the gas detector; the control motor is connected to the baffle plate and is used to control the movement of the baffle plate. This embodiment sets the number of venting valve branches to match the number of ventilation hoses, thus achieving a one-to-one correspondence between ventilation hoses and venting valve branches. The motor-controlled baffle plate allows for the opening or closing of multiple branches, enabling simultaneous detection of gas from multiple ventilation hoses and improving gas detection efficiency.

[0027] In some example implementations, the number of ventilation hoses is 3, and the number of branches is also 3. It should be noted that the number of ventilation hoses and branches can be flexibly adjusted according to actual engineering or operational needs, and there is no limitation here.

[0028] In some example implementations, the vent outlet of the vent valve is connected to the inlet of the gas detector.

[0029] In some example implementations, the control motor is any one of a DC motor, a servo motor, or a stepper motor. It should be noted that the type of control motor can be set according to the actual engineering or operational requirements, as long as the bidirectional movement of the baffle is achieved; this application does not impose any restrictions here.

[0030] In some example implementations, the widths of the three branches are all equal; the baffles include a left baffle and a right baffle, and the control motor is connected to the left baffle and the right baffle respectively; the spacing between the left baffle and the right baffle is equal to the width of the branch. This embodiment sets the spacing between the left and right baffles to the width of one branch, allowing one branch to be controlled at a time, connecting the ventilation hose to the gas detector to form a gas passage. This avoids gas mixing caused by multiple ventilation hoses connected to the vent valve, thereby improving the accuracy of multi-point detection results.

[0031] In some example implementations, the width of the branch is equal to the diameter of the ventilation hose. In actual engineering or operations, the diameter of the ventilation hose or the width of the branch can be set to a range of 5mm to 10mm. Specifically, the diameter of the ventilation hose or the width of the branch can be set to 6mm. It should be noted that the range of the diameter of the ventilation hose or the width of the branch can be set according to the actual engineering or operational requirements, as long as the width of the branch is kept equal to the diameter of the ventilation hose; this application does not impose any limitations on this.

[0032] In some example implementations, the width of the branch is equal to the width of the vent valve outlet, and the width of the vent valve outlet is equal to the width of the gas detector inlet. This embodiment sets the branch width to be equal to the vent valve outlet width, and the vent valve outlet width to be equal to the gas detector inlet width. The width of the gas detector inlet and the branch width of the vent valve are the same, ensuring equal inlet and outlet gas pressures and preventing pressure differentials from damaging the detection instrument.

[0033] In some example implementations, when the control motor moves the baffle, it simultaneously controls the left and right baffles to move in the same direction. This embodiment of the application ensures that the interval between the left and right baffles remains consistent and equal to the branch width by simultaneously controlling the left and right baffles to move in the same direction, thus maintaining a gas passage that can form one branch at a time.

[0034] In some example implementations, the maximum distance the baffle moves in the same direction is twice the width of the branch; when the baffle moves to the maximum distance in the same direction, the control motor switches the motor direction to the reverse. This embodiment of the application, by limiting the maximum distance the baffle moves in the same direction to twice the width of the branch, can limit the movement distance of the baffle, preventing it from moving out of the vent valve and causing leakage, thus reducing the impact of external gas on the accuracy of gas detection.

[0035] In some example implementations, the movement of the left and right baffles is achieved using one or two control motors. When there is only one control motor, both baffles move simultaneously in the same direction using the same motor. When there are two control motors, the left baffle can be connected to the first control motor, and the right baffle can be connected to the second control motor. The first and second control motors simultaneously control the left and right baffles to move in the same direction. The first and second control motors can be any of DC motors, servo motors, or stepper motors, and they must be of the same type. It should be noted that the type of control motor can be set according to actual engineering or operational requirements, as long as the left and right baffles can move synchronously in the same direction; this application does not impose any restrictions on this.

[0036] In some implementation examples, the baffle is a metal baffle; a metal coil is wound around the branch wall of the vent valve inlet branch, and the metal coil is connected to a power supply; after the control motor controls the baffle to move, the power supply energizes the metal coil, and the magnetic force generated by the energization attracts the baffle, closing the gas path that does not need to be detected. This embodiment of the application achieves this by winding a metal coil connected to the power supply around the branch, so that the magnetic force generated by the energization can attract the metal baffle, thereby closing the branch that does not need to be detected, leaving only the branch that needs to be detected open, thus forming a gas passage for detection. The electromagnetic force attracts and closes the gas path that does not need to be detected, which helps reduce gas mixing caused by other passages connecting to the vent valve, making the gas detection results more accurate. It should be noted that the power supply can be the power supply for the entire gas detection equipment, or a separate power supply can be set up for the branch wall coil. The power supply method can be set according to the actual engineering or operational needs, and this application does not impose any restrictions.

[0037] In some example implementations, the thickness of the branch wall and the outer wall of the venting valve ranges from 10mm to 15mm. Specifically, the thickness of the branch wall and the outer wall of the venting valve is 15mm. It should be noted that the thickness of the branch wall and the outer wall of the venting valve can be set according to actual engineering or operational requirements, as long as the branch wall and the outer wall of the venting valve have the strength to form a gas passage. This application does not impose any restrictions on this.

[0038] Specifically, taking a venting gate with three branches, a branch width of 6mm, and a branch wall thickness of 15mm as an example, the lengths of the left and right baffles are both 57mm to 65mm. It should be noted that, due to potential errors in the control motor's precision, to avoid the movement of the baffles causing gas from multiple branches to mix with gas outside the venting gate, thus affecting gas detection accuracy, the length of the baffles can be longer than the sum of the branches to be sealed and their walls, provided it does not affect detection and movement. This length margin can be set according to actual engineering or operational needs and is not limited here.

[0039] In some example implementations, the metal baffle can be made of ferromagnetic materials such as iron, cobalt, and nickel. It should be noted that the material of the metal baffle can be adjusted according to the actual engineering or operational requirements. It is only necessary to ensure that the metal baffle can be adsorbed to the branch under the action of the electromagnetic field to achieve the closure of the gas path. This application does not impose any restrictions here.

[0040] In some implementations, the outermost layer of the baffle is an insulating layer. Since this application uses magnetic force generated by energization to attract the metal baffle and close the branch, to avoid the metal baffle becoming difficult to move after attraction and to prevent damage to the control motor caused by energizing the metal baffle, this embodiment adds an insulating layer to the outermost layer of the metal baffle. This allows the metal baffle to move normally after being attracted by electromagnetic force and avoids electrical damage to the control motor caused by energizing the metal baffle.

[0041] In some example implementations, the insulating layer of the baffle is located on the side closest to the air inlet of the vent valve. If material costs for the vent valve baffle need to be saved in actual production, the baffle can be manufactured with an insulating layer on only one side. When assembling the vent valve, the side with the insulating layer should face the side with the branch, i.e., the side with the air inlet of the vent valve, as the insulating side from the branch. It should be noted that the insulating layer of the baffle can be achieved by bonding insulating material of the same length to a metal sheet, coating the metal sheet with an insulating material film, or other methods of forming an insulating layer. Furthermore, the insulating layer can be made of plastic or rubber, etc., and the material of the insulating layer can be adjusted according to actual engineering or operational requirements, as long as the outermost layer of the baffle remains insulating; this application does not impose any restrictions here.

[0042] Specifically, taking the process of the baffle of the vent valve of the three branch lines moving from right to left as an example, such as... Figure 2 As shown, initially, the rightmost branch is used as the passage, and both the left and right baffles are positioned at their maximum rightmost positions.

[0043] When detecting the gas in the rightmost branch, the metal coils wound on the branch walls of all branches are energized, attracting the left and right baffles and making them perpendicular to the branch walls, thus closing the leftmost and middle branches, and forming a gas passage with the gas detector in the rightmost branch for gas detection.

[0044] After testing and recording the detection points corresponding to the ventilation hose connected to the rightmost branch, the metal coil wound on the branch wall is de-energized. The left and right baffles no longer adhere to the branch wall. The control motor then moves the left and right baffles synchronously to the left, the distance being the sum of the branch width and the branch wall thickness. Gas detection is then performed on the middle branch. Figure 3 The position of the baffle is shown.

[0045] When detecting gas in the middle branch, the metal coils wound on the branch walls of all branches are energized, attracting the left and right baffles and making them perpendicular to the branch walls, thus closing the leftmost and rightmost branches, and forming a gas passage with the gas detector in the middle branch for gas detection.

[0046] After testing and recording the detection points corresponding to the ventilation hoses connected to the intermediate branch, the metal coil wound on the branch wall is de-energized. The left and right baffles no longer adhere to the branch wall. The control motor then moves the left and right baffles synchronously to the left, the movement distance being the sum of the branch width and the branch wall thickness. They move to the maximum movement limit of the left and right baffles, i.e., the leftmost branch, and gas detection is performed. Figure 4 The position of the baffle is shown.

[0047] When detecting the gas in the leftmost branch, the metal coils wound on the branch walls of all branches are energized, attracting the left and right baffles and making them perpendicular to the branch walls, thus closing the middle and rightmost branches, and forming a gas passage with the gas detector in the leftmost branch for gas detection.

[0048] After checking and recording the test points corresponding to the ventilation hose connected to the leftmost branch, since the left and right baffles have already moved to their maximum leftmost positions, when moving the baffles further, the control motor reverses, causing the left and right baffles to begin moving to the right, until... Figure 3 The position of the baffle is shown. Similarly, the method and process of moving to the right are similar to those of moving to the left, only the direction is different, which will not be elaborated here.

[0049] It should be noted that in the illustrative embodiments of this application, the limiting terms "left" and "right" are relative position limiting terms, and are used here only for illustrative purposes in conjunction with the accompanying drawings. Those skilled in the art should understand that in actual production applications, the direction of the baffle can be adjusted according to the actual engineering or operational requirements, and no restrictions are imposed here. In addition, the moving direction and sequence of the left and right baffles can also be manually controlled through a connected control program, and the detection can be performed in the order required by the actual engineering or operational requirements, and no restrictions are imposed here.

[0050] In some example implementations, the length differences between the multiple ventilation hoses are equal. The ratio of the length difference between the ventilation hoses to the total length of the manhole ranges from 1:3 to 1:5. It should be noted that the length of the ventilation hoses can be flexibly adjusted according to actual engineering or operational needs, and the range of the ratio of the length difference between the ventilation hoses to the total length of the manhole can also be adjusted according to actual engineering or operational needs; this application does not impose any limitations on this.

[0051] In some example implementations, the depth of the manhole is 2m, and the length difference between the ventilation hoses is 0.5m. It should be noted that, due to different requirements of various engineering or operational projects, the depth of the manhole can be adjusted accordingly based on the actual engineering or operational needs, and the length difference between the ventilation hoses can also be adjusted according to the actual engineering or operational needs; this application does not impose any restrictions on this.

[0052] In some example implementations, the lengths of multiple ventilation hoses can gradually increase or decrease according to the measurement sequence, or the required lengths can be set according to the actual engineering or operational needs. Taking three ventilation hoses as an example, the lengths of the three ventilation hoses could be: the first ventilation hose is 0.5m, the second ventilation hose is 1.0m, and the third ventilation hose is 1.5m; or the first ventilation hose is 1.5m, the second ventilation hose is 1.0m, and the third ventilation hose is 0.5m; or the first ventilation hose is 1.5m, the second ventilation hose is 0.5m, and the third ventilation hose is 1.0m; or the first ventilation hose is 1.8m, the second ventilation hose is 1.6m, and the third ventilation hose is 0.3m. Those skilled in the art will understand that the lengths of the ventilation hoses described here are merely illustrative examples, and this application does not limit the specific lengths of the ventilation hoses.

[0053] In this embodiment, a venting valve connected to a gas detector is used to open and close the gas passage. Multiple ventilation hoses are connected to the venting valve, and the venting valve controls the release of gas from these hoses. This allows for the direct testing of whether the gas at multiple detection points at different heights in the manhole is toxic or harmful in a single test, eliminating the need to adjust the length of the ventilation hoses. By performing multiple tests with a single adjustment, the efficiency of gas detection in the manhole is improved. Furthermore, since the ventilation hoses have different lengths, they represent different detection heights at which the hoses detect the gas in the manhole. The lengths of the ventilation hoses can be set according to requirements, eliminating the need to adjust the hose length after testing the gas at one detection point. This improves the accuracy of the detection points, thereby increasing both the efficiency and precision of detecting toxic or harmful gases in the manhole.

[0054] Those skilled in the art will understand that the above embodiments are specific embodiments for implementing this application, and in practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of this application.

Claims

1. A multi-point gas detection device for wells, characterized in that, include: Gas detector, vent valve, and three ventilation hoses; The three ventilation hoses are connected to the vent valve, which is used to control the opening or closing of the gas passage between the three ventilation hoses and the gas detector. The vent valve is connected to the gas detector; The three ventilation hoses are all of different lengths and all have the same diameter.

2. The in-well multi-point gas detection device according to claim 1, characterized in that, The venting valve includes a control motor, a baffle plate, an air inlet for the venting valve, and an air outlet for the venting valve. The number of branches at the air inlet of the vent valve is three; each branch is connected to a ventilation hose. The baffle is located between the branch of the vent valve inlet and the vent valve outlet; The vent valve outlet is connected to the gas detector. The control motor is connected to the baffle plate and is used to control the movement of the baffle plate.

3. The in-well multi-point gas detection device according to claim 2, characterized in that, All three branches have the same width; The baffle includes a left baffle and a right baffle, and the control motor is connected to the left baffle and the right baffle respectively; The distance between the left and right baffles is equal to the width of the branch.

4. The in-well multi-point gas detection device according to claim 3, characterized in that, When the control motor controls the baffle to move, it simultaneously controls the left baffle and the right baffle to move in the same direction.

5. The in-well multi-point gas detection device according to claim 4, characterized in that, The maximum distance the baffle moves in the same direction is twice the width of the branch; when the baffle moves to the maximum distance in the same direction, the control motor switches the motor direction to the opposite direction.

6. The in-well multi-point gas detection device according to claim 4, characterized in that, The baffle is a metal baffle; A metal coil is wound around the branch wall of the air inlet branch of the venting valve, and the metal coil is connected to a power supply. After the control motor moves the baffle, the power supply energizes the metal coil, and the magnetic force generated by the energization attracts the baffle, closing the air path that does not need to be detected.

7. The in-well multi-point gas detection device according to claim 6, characterized in that, The outermost layer of the baffle is an insulating layer.

8. The well multi-point gas detection device according to any one of claims 2 to 7, characterized in that, The device also includes a detection result recording module; The detection result recording module includes a data group recording submodule and a result recording submodule; The data group recording submodule is connected to the control motor and calculates the currently measured branch based on the number of forward and reverse rotations of the control motor. The result recording submodule is connected to the gas detector and records the gas detection results.

9. The well multi-point gas detection device according to any one of claims 2 to 7, characterized in that, The width of the branch is equal to the width of the vent outlet of the vent valve.

10. The well multi-point gas detection device according to any one of claims 1 to 7, characterized in that, The length differences of the three ventilation hoses are equal, and the ratio of the length difference between the ventilation hoses to the total length of the manhole is in the range of 1:3 to 1:5.

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