A direct-insertion pipeline fluid detection device and detection method thereof

Abstract

The present invention discloses a direct-insert pipeline fluid detection device and a detection method thereof, and belongs to the field of online measurement of industrial fluids. The detection device of the present invention comprises a direct-insert sensor and a fluid cavity, wherein the fluid cavity is installed at the front end of the direct-insert sensor, and the length of the fluid cavity extends to a position not less than that of the detection component of the direct-insert sensor, the fluid cavity is located outside the detection component, and a channel for fluid circulation is provided in the fluid cavity. The present invention overcomes the current situation that the direct-insert fluid sensor in the prior art has insufficient detection accuracy and is inconvenient to install and apply, and forms a pipeline detection pool inside the pipeline to change the fluid characteristics near the sensor, such as flow velocity, flow direction, liquid level, etc., so as to improve the measurement accuracy of the sensor.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial fluid online measurement, and more specifically to a direct-insertion pipeline fluid detection device and a detection method thereof, which can be directly installed on a pipeline and change the flow field characteristics near a sensor. Background Art

[0002] The development of industrial informatization has led to a large number of online monitoring needs. Online parameter measurement technologies and products for industrial fluids such as lubricants and chemical raw materials have been widely used. Sensors for online measurement of industrial fluids mainly use two installation methods: pipeline direct insertion and bypass. The direct insertion installation is generally recognized by users due to its low cost and less equipment modification workload.

[0003] However, the direct-insertion sensors currently commonly used in the industry have the following installation problems in actual applications: (1) Factors such as the flow rate of the fluid in the pipeline have a significant impact on the measurement accuracy. Since the flow parameters of the fluid in the pipeline cannot be known before the sensor is installed, the error of the sensor measurement increases; (2) The drilling workload is large, and the drilling position and angle cannot be adjusted at will after they are determined. If the fluid level is too low after the sensor is installed and the sensor does not work properly, it can only be installed by drilling another hole, causing the production line to stop and cost a lot. The method of installing the sensor at the bottom of the pipeline can partially improve the above problems, but it brings about the new problem that the sensor is not easy to install and maintain. Therefore, the industry is in urgent need of a pipeline direct-insertion detection device that can adapt to all different flow field characteristics.

[0004] At present, the detection application of pipeline fluids has been very mature, and there are also abundant related patent technologies, such as the Chinese patent application number: 2014204517845, the invention name is: pipeline fluid monitor, the application includes a shell, a controller arranged in the shell, and also includes a detection sensor electrically connected to the controller, a sonar sensor for receiving information sent by other pipeline fluid monitors, and a sonar sensor for sending information of the pipeline fluid monitor in which it is located; the sonar transceiver parts of the two sonar sensors are arranged opposite to each other. The application is to transmit data by using sonar sensors to avoid the influence of various external environments, and it is also inserted and installed in the pipeline in a drillable form, but it also faces the above-mentioned application defects. Summary of the invention

[0005] 1. Technical problem to be solved by the invention

[0006] The purpose of the present invention is to overcome the current situation that the direct-insertion fluid sensor in the prior art has insufficient detection accuracy and is inconvenient to install and use, and to provide a direct-insertion pipeline fluid detection device and a detection method thereof. The detection device of the present invention forms a pipeline detection pool inside the pipeline to change the fluid properties near the sensor such as flow rate, flow direction, liquid level, etc., so as to improve the measurement accuracy of the sensor, and can modify the corresponding settings according to the actual pipeline size and fluid properties to obtain pipeline detection pools with different effects, providing a better fluid environment for normal measurement of the sensor; secondly, the device of the present invention can be easily entered and removed from the installation hole of the pipeline, is easy to use, and effectively reduces the workload of drilling.

[0007] 2. Technical solution

[0008] In order to achieve the above object, the technical solution provided by the present invention is:

[0009] A direct-insert pipeline fluid detection device of the present invention comprises a direct-insert sensor and a fluid cavity. The fluid cavity is installed at the front end of the direct-insert sensor and extends to a length not less than the position of the detection component of the direct-insert sensor. The fluid cavity is located outside the detection component and a channel for fluid circulation is provided in the fluid cavity.

[0010] Furthermore, the direct insertion sensor includes a detection component, a threaded component, a cylindrical component and a pressing platform from the front end part contacting the measured fluid to the rear, wherein a sealing ring is installed between the cylindrical component and the pressing platform, and the diameter of each part increases from front to rear.

[0011] Furthermore, the fluid cavity includes a connector and a fixed baffle; the connector is used to be installed and connected with the plug-in sensor, and the fixed baffle is connected to the edge of the connector and extends downward, and the extension length is not less than the position of the detection component of the plug-in sensor.

[0012] Furthermore, it also includes movable baffles, which are installed on the fluid cavity and distributed around the detection component of the direct insertion sensor. The movable baffles have open and closed states, and the switching between the two states is achieved by the up and down movement of the direct insertion sensor in the pipeline; when in use, at least one group of baffles has an angle with the direction of the fluid in the pipeline that is not 0.

[0013] Furthermore, the movable baffle is rotatably mounted on the fixed baffle, and in the closed and open states, the movable baffle has angles θ1 and θ2 with the fixed baffle respectively, θ1<θ2, and the baffle cross-sectional area corresponding to θ2 in the open state is greater than the baffle cross-sectional area corresponding to θ1.

[0014] Furthermore, the movable baffle is hingedly mounted on at least one side of the fixed baffle through a rotating shaft. The movable baffle and the fixed baffle are installed in parallel in a stacked manner and can rotate around the rotating shaft to achieve relative opening or closing. When the movable baffle gradually contacts the inner wall of the pipe, it gradually opens to the side; when the movable baffle is separated from the inner wall of the pipe, it gradually droops and closes due to its own weight, and the angle between it and the fixed baffle gradually decreases.

[0015] Furthermore, the movable baffle is installed on at least one side of the fixed baffle through a hinge, and can be opened and closed and rotated around the fixed baffle, and the maximum rotation angle of the hinge does not exceed 180°.

[0016] Furthermore, a control mechanism is also provided at the front end of the movable baffle, which contacts the inner wall of the pipe before the movable baffle, and can be opened under the contact force of the inner wall of the pipe, and can be closed under the action of gravity or elastic force when it is separated from the inner wall of the pipe, thereby driving the movable baffle to switch between the open or closed state.

[0017] Furthermore, the control mechanism includes a double-arm structure or a V-shaped spring wire connected by a hinge, the movable baffle plates are symmetrically arranged on both sides of the fixed baffle plate, and the two ends of the control mechanism are correspondingly connected to the movable baffle plates on both sides.

[0018] A direct-insertion pipeline fluid detection method of the present invention uses the above detection device for detection, including the following process:

[0019] S1. Turn the active baffle plate or control mechanism of the plug-in sensor inward so that the active baffle plate is in a closed state relative to the fixed baffle plate;

[0020] S2. Install the direct insertion sensor into the pipeline from the installation hole on the pipeline, and make the movable baffle parallel to the axis direction of the pipeline;

[0021] S3, continue to move the plug-in sensor downward so that the lower end of the movable baffle or the control mechanism contacts the inner wall of the pipeline;

[0022] S4, after the lower end of the movable baffle or the control mechanism contacts the inner wall of the pipe, a thrust is continuously applied downward to open the movable baffle;

[0023] S5. Rotate the plug-in sensor so that the movable baffle is perpendicular to the axial direction of the pipeline, and tighten the plug-in sensor to install it on the pipeline, thus forming a pipeline detection pool.

[0024] S6. After the test is completed, the plug-in sensor is moved upwards. The movable baffle gradually closes under the action of gravity or the control mechanism. The plug-in sensor is continuously lifted. When the movable baffle contacts the edge of the installation hole on the pipeline, the movable baffle is completely closed and can be smoothly removed from the pipeline installation hole.

[0025] or:

[0026] When the plug-in sensor only has a fixed baffle, install the plug-in sensor so that the fixed baffle is perpendicular to the axial direction of the pipeline, tighten the plug-in sensor and install it on the pipeline to form a pipeline detection pool; after the detection is completed, move the plug-in sensor upwards and take it out.

[0027] 3. Beneficial effects

[0028] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0029] (1) In current practice, sensors are often installed on industrial pipelines by drilling holes. There are strict requirements on the location, number and size of the installation holes. Too many installation holes or too large sizes will affect the strength of the pipeline and pose a threat to production safety. In actual applications, since the fluid parameters in the pipeline, such as the liquid level or flow rate, are not clear when drilling holes, the sensor may not work after installation due to the liquid level being too low, resulting in the need for re-drilling, which increases costs and poses a hidden danger to pipeline safety. The present invention overcomes the above problems.

[0030] (2) The detection device of the present invention adopts a baffle design, which allows the sensor installed with a fluid cavity to smoothly enter the interior of the pipeline through a smaller installation hole, forming a larger baffle surface before and after the sensor, thereby changing the fluid environment measured by the sensor and improving the measurement effect.

[0031] (3) The in-line pipeline fluid detection device of the present invention has a simple overall structural design, is easy to use, has high reliability, and is easy to install and disassemble from the top of the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the application state structure of the direct-insertion pipeline fluid detection device of the present invention;

[0033] Figure 2 It is a schematic diagram of the appearance structure of the detection device of the present invention;

[0034] Figure 3 It is a schematic diagram of the side structure of the fluid cavity in the present invention;

[0035] Figure 4 It is a schematic diagram of the structure of the parallel rotating fluid cavity in the present invention;

[0036] Figure 5 It is a structural schematic diagram of the open-and-close fluid cavity in the present invention;

[0037] Figure 6 It is a schematic diagram of the top view of the open-and-close fluid cavity in the present invention;

[0038] Figure 7 It is a schematic diagram of the structure of the fluid cavity with a control mechanism in the present invention.

[0039] Explanation of the symbols in the schematic diagram:

[0040] 100, plug-in sensor; 200, fluid cavity; 300, movable baffle; 400, pipeline; 500, control mechanism; 101, detection component; 102, threaded component; 103, cylindrical component; 104, press table; 105, sealing ring; 201, connector; 202, fixed baffle; 203, threaded hole; 301, rotating shaft; 302, hinge. DETAILED DESCRIPTION

[0041] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the accompanying drawings.

[0042] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the 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 cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0043] The present invention will be further described below in conjunction with the embodiments.

[0044] Example 1

[0045] like Figure 1-Figure 4 As shown, a direct-insertion pipeline fluid detection device of this embodiment includes a direct-insertion sensor 100 and a fluid cavity 200. The fluid cavity 200 is installed at the front end of the direct-insertion sensor 100, and the length extends to a position not less than that of the detection component 101 of the direct-insertion sensor 100. The fluid cavity 200 is located outside the detection component 101, and a channel for fluid circulation is provided in the fluid cavity 200.

[0046] In this embodiment, the direct insertion sensor 100 can be a sensor for measuring fluid viscosity, particles and other parameters. It can be applied according to actual detection needs. The specific selection and application of the sensor, as well as the installation and fixation between the sensor and the pipeline 400 during use are all existing technologies in the industry and will not be repeated here.

[0047] Specifically, Figure 2As shown, the direct insertion sensor 100 includes a detection component 101, a threaded component 102, a cylindrical component 103 and a pressing platform 104 from the front end portion contacting the measured fluid to the back, wherein a sealing ring 105 is installed between the cylindrical component 103 and the pressing platform 104, and the diameter of each part increases from the front to the back. Figure 3 As shown, the fluid cavity 200 includes a connector 201 and a fixed baffle 202; the connector 201 is used to be installed and connected with the direct plug-in sensor 100. Specifically, a threaded hole 203 is opened in the middle of the connector 201 for connecting and installing with the threaded component 102 on the direct plug-in sensor 100. The fixed baffle 202 is rigidly connected to the edge of the connector 201 and extends downward. The fixed baffle 202 can be set in the front and rear positions of the detection component 101, and the extension length is not less than the position of the detection component 101 of the direct plug-in sensor 100.

[0048] In this embodiment, the connector 201 can be a square prism or a cylindrical structure, and the fixed baffle 202 can also be a flat plate structure or an arc panel structure. In actual applications, when the fluid level in the pipeline 400 is still high and the flow speed is fast, the fixed baffle 202 is directly used to abut against the inner wall of the pipeline 400, so that the detection component 101 of the direct insertion sensor 100 is completely immersed in the fluid, and at least one fixed baffle 202 has an angle with the fluid flow direction that is not 0. The fixed baffle 202 can change the flow field characteristics near the sensor, so as to change the fluid characteristics near the detection component 101, such as flow velocity, flow direction or liquid level, so as to fully ensure the detection accuracy of the detection component 101.

[0049] Example 2

[0050] A direct-insertion pipeline fluid detection device of the present embodiment has the same basic structure as that of the first embodiment. Furthermore, in the present embodiment, on the basis of the fixed baffle 202, a movable baffle 300 is further provided. The movable baffle 300 is installed on the fluid cavity 200 and distributed around the detection component 101 of the direct-insertion sensor 100. The movable baffle 300 has an open state and a closed state, and the switching between the two states is realized by the up and down movement of the direct-insertion sensor 100 in the pipeline 400. Similarly, when in use, the angle between at least one group of movable baffles 300 and the direction of the fluid in the pipeline 400 is not 0.

[0051] In this embodiment, the movable baffle plate 300 is rotatably mounted on the fixed baffle plate 202. The movable baffle plate 300 has an angle θ1 and an angle θ2 with the fixed baffle plate 202 in the closed and open states, respectively. The angle θ1 corresponds to the installation hole of the inlet and outlet pipe 400 of the fluid cavity 200. The angle between the movable baffle plate 300 and the fixed baffle plate 202 in the closed state is as follows: Figure 4As shown, θ2 corresponds to the angle between the movable baffle plate 300 and the fixed baffle plate 202 when the direct insertion sensor 100 is working in the pipeline 400. Figure 1 As shown, and θ1<θ2, the blocking cross-sectional area corresponding to θ2 in the open state is greater than the blocking cross-sectional area corresponding to θ1.

[0052] Specific examples include Figure 1 As shown, the movable baffle 300 is hingedly installed on at least one side of the fixed baffle 202 through a rotating shaft 301. In this embodiment, the movable baffle 300 can be provided on both sides; the rotating shaft 301 is vertically installed on the fixed baffle 202, and the movable baffle 300 and the fixed baffle 202 are installed in parallel in a stacked manner. They can rotate around the rotating shaft 301 and realize relative opening or closing. When the movable baffle 300 gradually contacts the inner wall of the pipe 400, it gradually opens to the side; when the movable baffle 300 is separated from the inner wall of the pipe 400, it gradually droops and closes due to its own weight, and the angle between it and the fixed baffle 202 gradually decreases.

[0053] In this embodiment, the movable baffle 300 can be set as a blade-like structure with a straight ridge edge facing outward, and one of its edges is set as a curve shape similar to the curvature of the inner wall of the pipe 400, so that the baffle cross-sectional area can be effectively increased in the open state, and the bottom of the movable baffle 300 is not completely in contact with the inner wall of the pipe 400, and a certain gap can be reserved for some impurities and other substances in the fluid to pass smoothly; the rotating shaft 301 is installed at the edge of the center line of the movable baffle 300 away from the curved edge, and the angle of the movable baffle 300 relative to the curved edge is cut off, so that the center of gravity coincides with the center line or is located in the un-chamfered half area, so that it can be relatively drooped inward and closed under the action of its own weight later. That is, when the movable baffle 300 is freely suspended on the fixed baffle 202 by the rotating shaft 301, the movable baffle 300 and the fixed baffle 202 can completely overlap, and the angle between the two is θ1=0° at this time. Figure 4 shown.

[0054] like Figure 1 As shown, when the direct insertion sensor 100 moves downward in the pipe 400, the movable baffle 300 rotates in both directions under the thrust of the rotating shaft 301 and the resistance of the inner wall of the pipe 400. When the lower end of the fixed baffle 202 contacts the inner wall of the pipe 400, the movable baffle 300 is fully opened to both sides. At this time, the angle between the movable baffle 300 and the fixed baffle 202 is θ2 = 90°, and the fluid cavity 200 stops moving. Similarly, in practice, the shape of the movable baffle 300 can adopt a variety of designs, which can effectively meet the needs of the baffle cross-sectional area and the needs of the drooping closed state, which is not limited here and will not be described in detail.

[0055] Example 3

[0056] The present embodiment is a direct-insertion pipeline fluid detection device, the basic structure of which is the same as that of the embodiment 2, except that in the present embodiment, Figure 5 As shown, the movable baffle 300 is installed on at least one side of the fixed baffle 202 through a hinge 302. Specifically, the movable baffle 300 is installed on the edges of both sides of the fixed baffle 202. The movable baffle 300 can open and close around the fixed baffle 202, and the maximum rotation angle of the hinge 302 does not exceed 180°.

[0057] In this embodiment, when the movable baffle 300 is closed, the angle θ1 between the movable baffle 300 and the fixed baffle 202 is 0° in the best state, and the detection device can be installed through the installation hole of the pipeline 400. When the movable baffle 300 is opened, the angle θ2 between the movable baffle 300 and the fixed baffle 202 is 90°. Similarly, the lower wall of the movable baffle 202 can also be set to a curve shape similar to the curvature of the inner wall of the pipeline 400, while not completely fitting to retain a certain gap.

[0058] Example 4

[0059] A direct-insert pipeline fluid detection device of the present embodiment has the same basic structure as the above-mentioned embodiment. Furthermore, a control mechanism 500 is further provided at the front end of the movable baffle 300. The control mechanism 500 will contact the inner wall of the pipeline 400 before the movable baffle 300, and the control mechanism 500 can be opened under the contact force of the inner wall of the pipeline 400, and can be closed under the action of gravity or elastic force when it is separated from the inner wall of the pipeline 400, thereby driving the movable baffle 300 to switch between the open or closed state.

[0060] In this embodiment, the control mechanism 500 includes a double-arm structure or a V-shaped spring wire connected by a hinge. The movable baffles 300 are symmetrically arranged on both sides of the fixed baffle 202, and the two ends of the control mechanism 500 are correspondingly connected to the movable baffles 300 on both sides.

[0061] Specific as Figure 7As shown, both sides of the fixed baffle 202 are provided with movable baffles 300, and the control mechanism 500 is a double-arm structure connected by hinges, and the two ends of the double-arm structure are connected to the ends of the movable baffle 300 by a rotating shaft to form a movable parallelogram. When the angle between the movable baffle 300 and the fixed baffle 202 is 0, the angle between the two arms is the smallest, and the direct-insertion sensor 100 can enter the interior of the pipeline through the mounting hole on the pipeline 400. When the direct-insertion sensor 100 moves downward in the pipeline 400, the hinge connection part of the double-arm structure will first contact the bottom inner wall of the pipeline 400, and the parallelogram formed by the double-arm structure and the movable baffle 300 will deform under the obstruction of the inner wall of the pipeline 400, and the angle between the two arms will increase until the lower edge of the fixed baffle 202 touches the inner wall of the pipeline 400, at which time the angle between the two arms is the largest, and the movable baffle 300 is in a fully open state. When the plug-in sensor 100 needs to be removed, the sensor is moved upward, and the parallelogram formed by the double-arm structure and the movable baffle 300 is deformed under the action of gravity, and the angle between the two arms is reduced, thereby driving the movable baffle 300 to close.

[0062] A direct-insertion pipeline fluid detection method of this embodiment uses the detection device in the above embodiment to perform detection, including the following process:

[0063] When there is only a fixed baffle 202, the direct insertion sensor 100 is inserted into the pipeline 400 from the mounting hole on the pipeline 400, and the fixed baffle 202 is perpendicular to the axial direction of the pipeline 400; the direct insertion sensor 100 is continued to be moved downward so that the lower end of the fixed baffle 202 contacts the inner wall of the pipeline 400, and the locking nut on the direct insertion sensor 100 is tightened to install it on the pipeline 400, so as to form a pipeline detection pool; after the detection is completed, the locking nut is loosened and the direct insertion sensor 100 is moved upward to be taken out.

[0064] When there is a movable baffle 300 or a control mechanism 500, the movable baffle 300 is initially in a closed state, such as in the best state, the angle θ1 between the movable baffle 300 and the fixed baffle 202 is 0°;

[0065] Install the direct insertion sensor 100 downward into the pipeline 400 from the mounting hole on the pipeline 400, and make the movable baffle 300 parallel to the axis direction of the pipeline 400;

[0066] Continue to move the direct insertion sensor 100 downward, so that the lower end of the movable baffle 300 or the control mechanism 500 contacts the inner wall of the pipe 400;

[0067] Continue to apply thrust downward, so that the movable baffle 300 is rotated open under the resistance of the inner wall of the pipeline 400 or opened by the control mechanism 500, such that the angle θ2 between the movable baffle 300 and the fixed baffle 202 is 90°; then rotate the direct plug-in sensor 100, specifically 90°, so that the movable baffle 300 is perpendicular to the axial direction of the pipeline 400, tighten the direct plug-in sensor 100 and install it on the pipeline 400, so as to form a pipeline detection pool;

[0068] After the detection is completed, when it is necessary to remove the direct insertion sensor 100 from the pipe 400, the direct insertion sensor 100 is moved upward, and the movable baffle 300 gradually closes under the action of gravity or the control mechanism 500, and the direct insertion sensor 100 continues to be lifted. When the movable baffle 300 contacts the edge of the mounting hole on the pipe 400, the movable baffle 300 is squeezed by the inner wall of the mounting hole of the pipe 400 and is completely closed, and can be smoothly removed from the mounting hole of the pipe 400.

[0069] The present invention and its embodiments are described schematically above, and the description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by it and designs a structural method and an embodiment similar to the technical solution without creativity without departing from the purpose of the invention, they shall all fall within the protection scope of the present invention.

Claims

1. A direct-insertion pipeline fluid detection device, characterized in that: The invention comprises a direct-insertion sensor (100) and a fluid cavity (200), wherein the fluid cavity (200) is mounted at the front end of the direct-insertion sensor (100) and has a length extending to a position not less than that of a detection component (101) of the direct-insertion sensor (100), the fluid cavity (200) is located outside the detection component (101), and a channel for fluid circulation is provided in the fluid cavity (200); The fluid cavity (200) comprises a connecting body (201) and a fixed baffle plate (202); the connecting body (201) is used to be installed and connected with the direct-insertion sensor (100); the fixed baffle plate (202) is connected to the edge of the connecting body (201) and extends downward, and the extension length is not less than the position of the detection component (101) of the direct-insertion sensor (100); The detection device further comprises movable baffles (300), the movable baffles (300) being mounted on the fluid cavity (200) and distributed around the detection component (101) of the direct-insertion sensor (100), the movable baffles (300) having an open state and a closed state, and the switching between the two states is achieved by the up and down movement of the direct-insertion sensor (100) in the pipeline (400); when in use, the angle between at least one set of baffles and the direction of the fluid in the pipeline (400) is not zero; The direct-insertion sensor (100) comprises, from the front end portion contacting the measured fluid to the rear, a detection component (101), a threaded component (102), a cylindrical component (103) and a pressing table (104); when the detection device is used, the movable baffle (300) is first placed in a closed state relative to the fixed baffle (202); then the direct-insertion sensor (100) is inserted downward into the pipeline (400) so that the movable baffle (300) is parallel to the axis direction of the pipeline (400); the installation is continued to be pushed downward so that the movable baffle (300) is opened to both sides; then the direct-insertion sensor (100) is rotated so that the movable baffle (300) is perpendicular to the axis direction of the pipeline (400); and the direct-insertion sensor (100) is tightened and installed on the pipeline (400) to form a pipeline detection pool.

2. The in-line pipeline fluid detection device according to claim 1, characterized in that: A sealing ring (105) is installed between the cylindrical component (103) and the pressing platform (104), and the diameters of the various parts increase from front to back.

3. The in-line pipeline fluid detection device according to claim 1, characterized in that: The movable baffle plate (300) is rotatably mounted on the fixed baffle plate (202); in the closed and open states, the movable baffle plate (300) has angles θ1 and θ2 with the fixed baffle plate (202), respectively, θ1<θ2, and the baffle cross-sectional area corresponding to θ2 in the open state is greater than the baffle cross-sectional area corresponding to θ1.

4. The in-line pipeline fluid detection device according to claim 3, characterized in that: The movable baffle (300) is hingedly mounted on at least one side of the fixed baffle (202) via a rotating shaft (301); the movable baffle (300) and the fixed baffle (202) are installed in a stacked manner and in parallel, and can rotate around the rotating shaft (301) to achieve relative opening or closing; when the movable baffle (300) gradually contacts the inner wall of the pipe (400), it gradually opens to the side; when the movable baffle (300) is separated from the inner wall of the pipe (400), it gradually droops and closes due to its own weight, and the angle between it and the fixed baffle (202) gradually decreases.

5. The in-line pipeline fluid detection device according to claim 3, characterized in that: The movable baffle plate (300) is mounted on at least one side of the fixed baffle plate (202) via a hinge (302), and can be opened and closed and rotated around the fixed baffle plate (202), and the maximum rotation angle of the hinge (302) does not exceed 180 degrees.

6. A direct-insertion pipeline fluid detection device according to claim 4 or 5, characterized in that: A control mechanism (500) is also provided at the front end of the movable baffle (300). The control mechanism (500) contacts the inner wall of the pipe (400) before the movable baffle (300). The control mechanism (500) can be opened under the contact force of the inner wall of the pipe (400), and can be closed under the action of gravity or elastic force when separated from the inner wall of the pipe (400), thereby driving the movable baffle (300) to switch between an open and closed state.

7. The in-line pipeline fluid detection device according to claim 6, characterized in that: The control mechanism (500) comprises a double-arm structure or a V-shaped spring wire connected by a hinge, the movable baffle plates (300) are symmetrically arranged on both sides of the fixed baffle plate (202), and the two ends of the control mechanism (500) are correspondingly connected to the movable baffle plates (300) on both sides.

8. A direct-insertion pipeline fluid detection method, using the detection device according to any one of claims 1 to 7, characterized in that: The process includes: S1, rotating the movable baffle plate (300) or the control mechanism (500) of the direct insertion sensor (100) inwardly so that the movable baffle plate (300) is in a closed state relative to the fixed baffle plate (202); S2, installing the direct insertion sensor (100) downwardly into the pipeline (400) from the mounting hole on the pipeline (400), and making the movable baffle (300) parallel to the axial direction of the pipeline (400); S3, continuing to move the direct-insertion sensor (100) downward, so that the lower end of the movable baffle (300) or the control mechanism (500) contacts the inner wall of the pipe (400); S4, after the lower end of the movable baffle (300) or the control mechanism (500) contacts the inner wall of the pipe (400), a thrust force is continuously applied downwards, so that the movable baffle (300) opens; S5, rotating the direct-insertion sensor (100) so that the movable baffle plate (300) is perpendicular to the axial direction of the pipeline (400), and tightening the direct-insertion sensor (100) to install it on the pipeline (400), thereby forming a pipeline detection pool; S6. After the detection is completed, the plug-in sensor (100) is moved upward, and the movable baffle plate (300) is gradually closed under the action of gravity or the control mechanism (500). The plug-in sensor (100) is continuously lifted upward. When the movable baffle plate (300) contacts the edge of the mounting hole on the pipeline (400), the movable baffle plate (300) is completely closed and can be smoothly removed from the mounting hole of the pipeline (400).

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