Ultrasonic flow metering device

Abstract

The invention discloses an ultrasonic flow metering device, and belongs to the technical field of natural gas flow metering. Comprising a protection cylinder, the two ends of the protection cylinder are in threaded connection with protection covers, the joints of a pipeline and a circulation pipeline are wrapped with heat preservation cotton, a rubber air bag is arranged on the outer surface of the heat preservation cotton, an adjusting mechanism is arranged in the protection cylinder, a driving mechanism is further arranged in the protection cylinder, and an inflation mechanism is arranged on the outer circle face of the rubber air bag. When gas flow measurement is carried out in winter, heat preservation cotton is used for wrapping the connecting position between two pipelines, the influence of the external temperature is preliminarily reduced, a driving mechanism is used for enabling a threaded sleeve to slide forwards, the threaded sleeve moves to trigger an inflation mechanism, gas is injected into a rubber gas bag, the rubber gas bag is expanded and tightly extrudes the heat preservation cotton, and the gas flow is measured. A more effective heat insulation layer is formed, the heat preservation effect is improved, the influence of external temperature fluctuation on the temperature of natural gas in the pipeline is reduced, and it is ensured that the ultrasonic flowmeter obtains more accurate measurement data.

Description

Technical Field

[0001] The present invention relates to the technical field of natural gas flow metering, and more specifically, to an ultrasonic flow metering device. Background Art

[0002] With the growing global demand for clean energy, natural gas, as an efficient and environmentally friendly energy source, is gradually increasing its proportion in the energy structure. Although traditional orifice plate flowmeters are widely used in natural gas metering, they have problems such as high installation requirements, frequent maintenance, limited measurement accuracy, etc., especially performing poorly under low-flow conditions. In recent years, ultrasonic flowmeters determine the flow velocity by measuring the time difference of ultrasonic signals propagating downstream and upstream in the fluid, and then calculate the flow rate. Such flowmeters have advantages such as no moving parts, no pressure loss, strong adaptability, strong anti-interference ability, and intelligent diagnosis functions, and are increasingly used in the field of natural gas flow metering due to their unique advantages.

[0003] However, in practical applications, temperature changes, especially extreme temperature differences, pose significant technical challenges to ultrasonic flowmeters. Taking the oilfield gathering and transportation station in cold northern regions as an example, the day-night temperature difference can reach dozens of degrees Celsius, and this extreme temperature fluctuation poses a severe test to the performance of ultrasonic flowmeters. Without sufficient thermal insulation measures or electric tracing systems, the natural gas in the pipeline may condense into liquid or even freeze, hindering normal flow. Although electric heating tapes can be used to insulate the pipeline to reduce the temperature difference, over time, the connection parts may age, such as insulation layer damage, wire breakage, etc. If the sealing is not good or it is damaged mechanically, it may cause electric leakage or other safety hazards. Summary of the Invention

[0004] Aiming at the problems existing in the prior art, the purpose of the present invention is to provide an ultrasonic flow metering device, aiming to solve the above technical problems.

[0005] To solve the above problems, the present invention adopts the following technical solutions.

[0006] An ultrasonic flow metering device includes a pipeline. An ultrasonic flowmeter is provided at the middle of the outer circumferential surface of the pipeline. Both ends of the pipeline are externally connected with flow-through pipelines. Protective cylinders are provided at the connection parts between the pipeline and the flow-through pipelines. Protective covers are threadedly connected to both ends of the protective cylinders. The connection parts between the pipeline and the flow-through pipelines are wrapped with heat-insulating cotton, and a rubber airbag is provided on the outer surface of the heat-insulating cotton. An adjusting mechanism is provided inside the protective cylinder, and a driving mechanism for driving the adjusting mechanism to move is also provided inside the protective cylinder. Inflating mechanisms arranged in a circular pattern are provided on the outer circumferential surface of the rubber airbag; Among them, the driving mechanism includes servo motors fixedly connected to both sides of the outer cylindrical surface of the pipeline. The output end of the servo motor is fixedly connected with a driving rod. The outer cylindrical surface of the driving rod is fixedly connected with a main gear. The outer surface of the main gear is meshed with a gear ring. The outer cylindrical surface of the gear ring is fixedly connected with a limiting rod around it. The top of the limiting rod is fixedly connected with a ball. And on both sides of the outer cylindrical surface of the ball, there are limiting plates fixedly connected with the inner wall of the protective cylinder. And the two limiting plates together form a limiting groove to facilitate the movement of the ball.

[0007] As a further scheme of the present invention: The adjusting mechanism includes threaded rods arranged in a circumferential arrangement on the outer cylindrical surface of the pipeline. Both ends of the threaded rod are provided with support seats fixedly connected with the pipeline. And the threaded rod is rotatably connected in the support seat. One end of the threaded rod is fixedly connected with a driven gear. And the driven gear is meshed with the gear ring. The driven gear and the gear ring are used in cooperation to drive the threaded rod to rotate.

[0008] As a further scheme of the present invention: On both sides of the outer cylindrical surface of the threaded rod, there are limiting frames fixedly connected with the pipeline. The outer cylindrical surface of the threaded rod is threadedly connected with a threaded sleeve. On both sides of the outer cylindrical surface of the threaded sleeve, there are T-shaped sliders fixedly connected. And the T-shaped sliders are slidably connected in the limiting frames to realize the linear movement of the threaded sleeve.

[0009] As a further scheme of the present invention: The inflation mechanism includes a storage cylinder fixedly connected to the outer surface of the protective cylinder. One end of the storage cylinder is fixedly communicated with a connecting pipe. The inner wall of the storage cylinder is fixedly connected with a clamping plate. A push plate is slidably connected inside the storage cylinder. A blocking round block is slidably connected inside the connecting pipe. And between the blocking round block and the tail end of the connecting pipe, there is a second spring ring fixedly connected together. On the side of the connecting pipe close to the storage cylinder, there is an inflation pipe fixedly communicated. One end of the inflation pipe penetrates the protective cylinder and is fixedly communicated with the rubber airbag.

[0010] As a further scheme of the present invention: A support rod is fixedly connected between the push plate and the blocking round block. On one side of the outer surface of the blocking round block, there is a second pull rope fixedly connected. The second pull rope penetrates the connecting pipe and the protective cylinder and is fixedly connected with the threaded sleeve.

[0011] As a further scheme of the present invention: A sealing ring is arranged at the connection part of the second pull rope and the connecting pipe. And the rubber airbag is in a circular ring shape to wrap around the outer surface of the heat-insulating cotton.

[0012] As a further solution of the present invention: both sides of the outer cylindrical surface of the threaded sleeve are fixedly connected with special-shaped plates, one end of the special-shaped plates is commonly fixedly connected with a first extrusion plate for extruding the rubber airbag, and a second extrusion plate is provided on one side of the rubber airbag, the outer cylindrical surface of the second extrusion plate is fixedly connected with a fixed block, and the first extrusion plate and the second extrusion plate are used in combination to realize the deflation operation of the rubber airbag.

[0013] As a further solution of the present invention: a ventilation mechanism is provided on the outer circular surface of the protective cover, and the ventilation mechanism includes an air collecting tube fixedly connected to the outer circular surface of the protective cover, an air inlet scoop is fixedly connected to the top of the air collecting tube, a baffle is provided inside the air inlet scoop, a fixing plate is fixedly connected to the inner upper end of the air collecting tube, a first spring coil is fixedly connected between the baffle plate and the fixing plate, and the length of the baffle plate is smaller than the inner diameter of the air collecting tube.

[0014] As a further solution of the present invention: the ventilation mechanism also includes a fixing frame fixedly connected to the outer cylindrical surface of the pipe, an adjustment plate is hinged inside the fixing frame, the adjustment plate is provided with a support plate, the top of the threaded sleeve is fixedly connected to a U-shaped frame, one end of the support plate is hinged to the inside of the U-shaped frame, the other end of the support plate is hinged to the bottom of the adjustment plate, and a first pull rope is fixedly connected to the middle of the bottom of the blocking plate, and the first pull rope passes through the fixing plate and is fixedly connected to the adjustment plate.

[0015] As a further solution of the present invention: the blocking plate is clamped at the corner of the air inlet scoop, and the corner of the air inlet scoop is arranged at 45 degrees with the horizontal plane of the blocking plate.

[0016] Compared with the prior art, the above technical solution provided by the present invention has at least the following beneficial effects: This solution is equipped with a protective tube, a driving mechanism, an adjusting mechanism, a rubber airbag, and an inflating mechanism. When measuring the flow of gas in the pipeline in winter, the connection between the two pipelines is wrapped with thermal insulation cotton to initially reduce the impact of the external temperature, and the connection part is completely wrapped with a protective tube and a protective cover to form a closed space to protect the internal components from the external environment. The driving mechanism drives the threaded rod to rotate clockwise, causing the threaded sleeve to slide forward, and the movement of the threaded sleeve triggers the inflating mechanism to inject gas into the rubber airbag, causing it to expand and tightly squeeze the thermal insulation cotton to form a more effective insulation layer, improve the thermal insulation effect, reduce the impact of external temperature fluctuations on the temperature of the natural gas in the pipeline, and ensure that the ultrasonic flowmeter obtains more accurate measurement data.

[0017] By providing an adjustment mechanism and an inflation mechanism, when the threaded sleeve moves forward under the action of the driving mechanism, the second drawstring pulls the blocking round block to move, and drives the push plate to move synchronously through the support rod. The push plate slides smoothly along the inner wall of the storage cylinder under the guidance of the clamping plate, gradually squeezing out the gas in the storage cylinder. The gas passes through the connecting pipe and finally enters the rubber airbag through the inflation pipe, causing the rubber airbag to gradually expand to a full state, thus completing the tightening operation of the thermal insulation cotton. During this process, the pulling distance of the second drawstring is precisely controlled by the displacement of the threaded sleeve, thereby determining the moving range of the blocking round block and the stroke of the push plate, achieving fine adjustment of the inflation volume of the rubber airbag. At the same time, using the closed channel composed of the storage cylinder, the connecting pipe and the inflation pipe ensures that the gas can be quickly and losslessly transmitted to the rubber airbag, improving the inflation efficiency.

[0018] By providing a ventilation mechanism, when the threaded sleeve slides backward, the movement of the U-shaped frame is transmitted to the adjusting plate through the support plate hinge point, causing the adjusting plate to tighten inward. The movement of the adjusting plate pulls the blocking plate downward through the first drawstring, overcoming the elastic force of the first spring coil, causing the blocking plate to move downward into the air collecting cylinder, and the air inlet of the air inlet hopper is opened. After the air inlet of the air inlet hopper is opened, the outside air is introduced into the protective cover through the air collecting cylinder, and the fixed air collecting cylinder evenly distributes the cold air around the protective cover, helping to reduce the temperature inside the protective cylinder. Cold air is introduced in a timely manner in a high-temperature environment in summer, effectively reducing the temperature inside the protective cylinder, avoiding equipment overheating damage caused by high temperature, and ensuring the normal operation of the ultrasonic flowmeter. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings incorporated herein and constituting a part of the specification illustrate embodiments of the present invention and, together with the specification, are further used to explain the principles of the present invention and enable those skilled in the relevant art to implement and use the present invention.

[0020] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a cross-sectional view of the interior of the protective cylinder of the present invention; Figure 3 is a schematic connection diagram of the adjustment mechanism and the inflation mechanism of the present invention; Figure 4 is a schematic connection structure diagram of the adjustment mechanism of the present invention; Figure 5 is a schematic structure diagram of the driving mechanism and the adjustment mechanism of the present invention; Figure 6 is a specific connection schematic diagram of the inflation mechanism and the rubber airbag of the present invention; Figure 7 is a partial cross-sectional view of the protective cover of the present invention; Figure 8 is a cross-sectional view of the ventilation mechanism of the present invention.

[0021] Reference numerals: 1, pipeline; 2, ultrasonic flowmeter; 3, protective cylinder; 4, protective cover; 5, flow pipeline; 6, heat insulating cotton; 7, driving mechanism; 71, servo motor; 72, driving rod; 73, main gear; 74, gear ring; 75, limiting rod; 76, ball; 77, limiting plate; 8, adjusting mechanism; 81, threaded rod; 82, driven gear; 83, limiting frame; 84, threaded sleeve; 85, T-shaped slider; 9, ventilation mechanism; 91, fixing frame; 92, adjusting plate; 93, support plate; 94, air collecting cylinder; 95, air inlet hopper; 96, fixing plate; 97, first spring ring; 98, blocking plate; 99, first pull rope; 10, rubber air bag; 11, inflation mechanism; 111, storage cylinder; 112, connecting pipe; 113, clamping plate; 114, second spring ring; 115, pushing plate; 116, plugging round block; 117, second pull rope; 118, inflation pipe; 119, support rod; 12, special-shaped plate; 13, first pressing plate; 14, second pressing plate.

[0022] As shown in the figure, in order to clearly implement the structure of the embodiments of the present invention, specific structures and devices are marked in the figure, but this is only for schematic needs and is not intended to limit the present invention to this specific structure, device and environment. Those of ordinary skill in the art can adjust or modify these devices and environments according to specific needs. Detailed implementation manners

[0023] The following describes in detail a kind of ultrasonic flow measurement device provided by the present invention in conjunction with the accompanying drawings and specific embodiments. At the same time, it is hereby explained that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments. Those skilled in the art can also adopt other alternative methods for some well-known technologies; moreover, the accompanying drawings are only for more specifically describing the embodiments and are not intended to specifically limit the present invention.

[0024] As Figures 1 to 8As shown in the figure, an embodiment of the present invention provides an ultrasonic flow metering device, which includes a pipeline 1. An ultrasonic flowmeter 2 is provided at the middle of the outer circumferential surface of the pipeline 1. Both ends of the pipeline 1 are externally connected with flow-through pipelines 5. Protective cylinders 3 are provided at the connection parts between the pipeline 1 and the flow-through pipelines 5. Protective covers 4 are threadedly connected to both ends of the protective cylinder 3. The connection parts between the pipeline 1 and the flow-through pipelines 5 are wrapped with heat-insulating cotton 6, and a rubber airbag 10 is provided on the outer surface of the heat-insulating cotton 6. An adjusting mechanism 8 is provided inside the protective cylinder 3, and a driving mechanism 7 for driving the adjusting mechanism 8 to move is also provided inside the protective cylinder 3. An inflation mechanism 11 arranged in a circular pattern is provided on the outer circumferential surface of the rubber airbag 10. Among them, the driving mechanism 7 includes servo motors 71 fixedly connected to both sides of the outer circumferential surface of the pipeline 1. The output end of the servo motor 71 is fixedly connected with a driving rod 72. A main gear 73 is fixedly connected to the outer circumferential surface of the driving rod 72. A gear ring 74 is meshed with the outer surface of the main gear 73. A limiting rod 75 is fixedly connected around the outer circumferential surface of the gear ring 74. A ball 76 is fixedly connected to the top of the limiting rod 75. And limiting plates 77 fixedly connected to the inner wall of the protective cylinder 3 are provided on both sides of the outer circumferential surface of the ball 76, and the two limiting plates 77 together form a limiting groove for the movement of the ball 76.

[0025] As Figure 3 、 Figure 4 shown in the figure, the adjusting mechanism 8 includes threaded rods 81 arranged in a circular pattern on the outer circumferential surface of the pipeline 1. Support seats fixedly connected to the pipeline 1 are provided at both ends of the threaded rod 81, and the threaded rod 81 is rotatably connected inside the support seat. A driven gear 82 is fixedly connected to one end of the threaded rod 81, and the driven gear 82 is meshed with the gear ring 74. The driven gear 82 and the gear ring 74 are used in cooperation to drive the threaded rod 81 to rotate.

[0026] As Figure 3 、 Figure 4 shown in the figure, limiting frames 83 fixedly connected to the pipeline 1 are provided on both sides of the outer circumferential surface of the threaded rod 81. A threaded sleeve 84 is threadedly connected to the outer circumferential surface of the threaded rod 81. T-shaped sliders 85 are fixedly connected to both sides of the outer circumferential surface of the threaded sleeve 84, and the T-shaped sliders 85 are slidably connected to the limiting frames 83 to realize the linear movement of the threaded sleeve 84.

[0027] To solve the problem that the existing ultrasonic flowmeters have inaccurate measurement data due to large day-night temperature differences when measuring the gas flow in pipelines, the above technical solution is now adopted to solve the problem. The above technical solution mainly consists of a protective cylinder 3, a driving mechanism 7, an adjusting mechanism 8, a rubber airbag 10, and an air inflation mechanism 11, ensuring the stability and accuracy of the ultrasonic flowmeter 2 under extreme temperature change conditions. When in use, first connect the pipeline 1 with the external circulation pipeline 5 so that natural gas can flow normally. Use the heat-insulating cotton 6 to wrap the connection between the two pipelines to initially reduce the influence of the external temperature on the internal medium. And install the entire measuring device at the connection of the pipeline 1, and use the protective cylinder 3 and the protective cover 4 to completely wrap the connection part inside to form a closed space to further protect the internal components from the external environment. Then, by starting the servo motor 71, the driving rod 72 at its output end rotates clockwise, driving the main gear 73 to rotate synchronously. Since the main gear 73 is meshed and connected with the gear ring 74, when the main gear 73 rotates, the gear ring 74 will also rotate accordingly. And during the rotation of the gear ring 74, the limiting rod 75 and the ball 76 on it will roll in the limiting groove formed by the two limiting plates 77 to ensure the smooth movement of the gear ring 74. At the same time, since the gear ring 74 is meshed with the driven gear 82, as the gear ring 74 rotates, the driven gear 82 also rotates clockwise synchronously. The rotation of the driven gear 82 drives the threaded rod 81 to rotate clockwise, and then makes the threaded sleeve 84 slide forward along the threaded rod 81. The T-shaped sliders 85 fixedly connected to both sides of the threaded sleeve 84 slide in the limiting frame 83 to ensure that the threaded sleeve 84 makes a linear motion, thereby realizing the application of pressure on the rubber airbag 10. When the threaded sleeve 84 moves forward, it triggers the air inflation mechanism 11 to start working, injecting an appropriate amount of gas into the rubber airbag 10, making it gradually expand from a deflated state to a full state. After the rubber airbag 10 expands, it will tightly squeeze the heat-insulating cotton 6 to enhance its tightness and form a more effective heat-insulating layer. This process not only improves the heat-insulating effect but also can effectively compensate for the dimensional changes caused by temperature changes and maintain the sealing performance of the connection of the pipeline 1. During the above operation process, by enhancing the heat-insulating performance, the influence of external temperature fluctuations on the temperature of natural gas in the pipeline 1 is reduced, ensuring that the ultrasonic flowmeter 2 obtains more accurate measurement data, especially in an environment with large day-night temperature differences. And through the heat-insulating measures of setting the protective cylinder 3 and the protective cover 4, it can prevent the condensation or freezing of natural gas under low-temperature conditions, avoid equipment damage caused by ice blockage, and at the same time slow down the aging speed of the electric tracing band and reduce the maintenance cost. And the designs of the protective cylinder 3 and the protective cover 4 are convenient for disassembly, facilitating regular inspection and replacement of the heat-insulating material or the electric tracing system without affecting the daily operation.

[0028] Such as Figure 1 , Figure 3 , Figure 6As shown, the inflation mechanism 11 includes a storage cylinder 111 fixedly connected to the outer surface of the protective cylinder 3. One end of the storage cylinder 111 is fixedly communicated with a connecting pipe 112. A clamping plate 113 is fixedly connected to the inner wall of the storage cylinder 111. A push plate 115 is slidably connected inside the storage cylinder 111. A blocking circular block 116 is slidably connected inside the connecting pipe 112. A second spring ring 114 is fixedly connected between the blocking circular block 116 and the tail end of the connecting pipe 112. The connecting pipe 112 is fixedly communicated with an inflation pipe 118 on the side close to the storage cylinder 111. One end of the inflation pipe 118 penetrates through the protective cylinder 3 and is fixedly communicated with the rubber airbag 10.

[0029] As Figure 3 , Figure 6 shown, a support rod 119 is fixedly connected between the push plate 115 and the blocking circular block 116. A second pull rope 117 is fixedly connected to one side of the outer surface of the blocking circular block 116. The second pull rope 117 penetrates through the connecting pipe 112 and the protective cylinder 3 and is fixedly connected to the threaded sleeve 84.

[0030] As Figure 3 , Figure 6 shown, a sealing ring is provided at the connection between the second pull rope 117 and the connecting pipe 112. And the rubber airbag 10 is in a circular ring shape to wrap around the outer surface of the heat insulation cotton 6.

[0031] When not activated, the push plate 115 is located at the front end of the storage cylinder 111, the plugging circular block 116 is located on the side of the connecting pipe 112 close to the storage cylinder 111, and the second spring coil 114 is in a natural extended state. The inside of the storage cylinder 111 is filled with compressed gas, but since the plugging circular block 116 blocks the connecting pipe 112, the gas cannot flow out. When the threaded sleeve 84 moves forward under the action of the driving mechanism 7, the second pull rope 117 fixedly connected to the threaded sleeve 84 pulls the plugging circular block 116 closer to the tail end of the connecting pipe 112. As the plugging circular block 116 moves, it squeezes the second spring coil 114 and simultaneously drives the push plate 115 to move synchronously through the support rod 119. The push plate 115 slides smoothly along the inner wall of the storage cylinder 111 under the guidance of the clamping plate 113, gradually squeezing out the gas in the storage cylinder 111. The gas passes through the connecting pipe 112 and finally enters the rubber airbag 10 through the inflation pipe 118, causing the rubber airbag 10 to gradually expand to a full state. And a sealing ring is provided at the connection between the second pull rope 117 and the connecting pipe 112 to ensure that no gas leakage occurs during the movement of the pull rope. The inflated rubber airbag 10 tightly wraps the outer surface of the heat-insulating cotton 6 in a circular ring shape, not only increasing the thickness of the heat-insulating layer but also reducing the air circulation path, significantly improving the overall heat-insulating performance. During the above operation process, not only is the pulling distance of the second pull rope 117 accurately controlled by the displacement of the threaded sleeve 84, thereby determining the movement range of the plugging circular block 116 and the stroke of the push plate 115, realizing the fine adjustment of the inflation amount of the rubber airbag 10. Moreover, by using the closed channel composed of the storage cylinder 111, the connecting pipe 112, and the inflation pipe 118, it is ensured that the gas can be quickly and losslessly transmitted to the rubber airbag 10, improving the inflation efficiency. At the same time, by setting the clamping plate 113, the linear movement of the push plate 115 in the storage cylinder 111 is ensured, avoiding skew or jamming phenomena; while the second spring coil 114 provides a restoring force to ensure the reliability of the system when it returns to the initial state. The entire inflation process is automatically triggered by the movement of the threaded sleeve 84 without manual intervention, simplifying the operation process and reducing the maintenance cost.

[0032] As Figure 3 , Figure 4 , Figure 5 shown, on both sides of the outer circular surface of the threaded sleeve 84, special-shaped plates 12 are fixedly connected. One ends of the special-shaped plates 12 are fixedly connected together with a first pressing plate 13 for pressing the rubber airbag 10, and a second pressing plate 14 is arranged on one side of the rubber airbag 10. A fixing block is fixedly connected to the outer circular surface of the second pressing plate 14. The first pressing plate 13 and the second pressing plate 14 are used in cooperation to realize the deflation operation of the rubber airbag 10.

[0033] In the normal operating state, the rubber airbag 10 is in a gas-filled state, tightly wrapping the thermal insulation cotton 6, playing a good heat preservation role. The first pressing plate 13 and the second pressing plate 14 are respectively located on both sides of the rubber airbag 10, maintaining a certain distance and not applying pressure to it. When it is necessary to measure the gas flow rate in the pipeline 1, especially under high-temperature conditions in summer, the servo motor 71 is started to reverse. The reverse rotation of the servo motor 71 causes the driving rod 72 to drive the main gear 73 to rotate counterclockwise, and then drives the gear ring 74 meshing with it to also rotate counterclockwise. The counterclockwise rotation of the gear ring 74 drives the threaded rod 81 to rotate counterclockwise through the driven gear 82. The counterclockwise rotation of the threaded rod 81 causes the threaded sleeve 84 to slide backward along its axis. When the threaded sleeve 84 slides backward, it drives the special-shaped plates 12 fixed on both sides of its outer cylindrical surface to move synchronously. The special-shaped plate 12 pushes the first pressing plate 13 towards the inflated rubber airbag 10, gradually compressing the space of the rubber airbag 10. The first pressing plate 13 and the second pressing plate 14 preset on the other side of the rubber airbag 10 act together to form a closed pressing space. Under the combined action of the two pressing plates, the gas in the rubber airbag 10 is gradually extruded and returns to the storage cylinder 111 through the air filling pipe 118 and the connecting pipe 112, completing the deflation process. And because a sealing ring is provided at the connection between the air filling pipe 118 and the connecting pipe 112, it ensures that the gas will not leak during the transmission process. After the rubber airbag 10 returns to the deflated state, the system can be readjusted to the initial position and wait for the next inflation operation. During the above operation process, through an effective deflation mechanism, the rubber airbag 10 is prevented from over-expanding due to overheating under high-temperature conditions in summer, ensuring the stability and safety of the system. Moreover, it avoids the rubber airbag 10 being in a high-pressure state for a long time, reduces the risk of material aging and damage, and extends its service life. At the same time, the pressure of the thermal insulation layer is adjusted in a timely manner in a high-temperature environment to ensure that the ultrasonic flowmeter 2 obtains more accurate measurement data, especially in an environment with large temperature fluctuations. The entire deflation process is automatically triggered by the reverse rotation of the servo motor 71, without manual intervention, simplifying the operation process and reducing the maintenance cost.

[0034] As Figure 1 , Figure 7 , Figure 8 shown, a ventilation mechanism 9 is provided on the outer cylindrical surface of the protective cover 4. The ventilation mechanism 9 includes an air collecting cylinder 94 fixedly connected around the outer cylindrical surface of the protective cover 4. The top of the air collecting cylinder 94 is fixedly connected with an air inlet hopper 95. A blocking plate 98 is arranged inside the air inlet hopper 95. A fixing plate 96 is fixedly connected to the upper end inside the air collecting cylinder 94. A first spring ring 97 is fixedly connected between the blocking plate 98 and the fixing plate 96, and the length of the blocking plate 98 is less than the inner diameter of the air collecting cylinder 94.

[0035] As Figure 1 , Figure 7 , Figure 8As shown, the ventilation mechanism 9 further includes a fixing frame 91 fixedly connected to the outer cylindrical surface of the pipeline 1. An adjusting plate 92 is hinged inside the fixing frame 91. The adjusting plate 92 is provided with a support plate 93. The top of the threaded sleeve 84 is fixedly connected with a U-shaped frame. One end of the support plate 93 is hinged inside the U-shaped frame, and the other end of the support plate 93 is hinged to the bottom of the adjusting plate 92. The middle of the bottom of the baffle plate 98 is fixedly connected with a first pull rope 99. The first pull rope 99 passes through the fixing plate 96 and is fixedly connected with the adjusting plate 92.

[0036] As Figure 1 , Figure 7 , Figure 8 shown, the baffle plate 98 is stuck at the corner of the air inlet hopper 95, and the corner of the air inlet hopper 95 and the horizontal plane of the baffle plate 98 are arranged at 45 degrees.

[0037] When the ventilation mechanism is not started, the baffle plate 98 is located at the top corner of the air inlet hopper 95, arranged at 45 degrees with the horizontal plane of the air inlet hopper 95, and blocks the air inlet. A certain elastic force is maintained between the baffle plate 98 and the fixing plate 96 through the first spring ring 97, so that the baffle plate 98 is in the closed position. When it is necessary to measure the gas flow rate in the pipeline, especially under the high temperature conditions in summer, start the servo motor 71 to reverse it. The reverse rotation of the servo motor 71 causes the driving rod 72 to drive the main gear 73 to rotate counterclockwise, and then drives the engaged gear ring 74 to also rotate counterclockwise. The counterclockwise rotation of the gear ring 74 drives the threaded rod 81 to rotate counterclockwise through the driven gear 82, causing the threaded sleeve 84 to slide backward along its axis. When the threaded sleeve 84 slides backward, it drives the U-shaped frame fixed on its top to move synchronously. The movement of the U-shaped frame is transmitted to the adjusting plate 92 through the hinge point of the support plate 93, causing the adjusting plate 92 to tighten inward. The movement of the adjusting plate 92 pulls the baffle plate 98 downward through the first pull rope 99, overcoming the elastic force of the first spring ring 97, so that the baffle plate 98 moves downward into the air collecting cylinder 94, and the air inlet of the air inlet hopper 95 is opened. After the air inlet of the air inlet hopper 95 is opened, the outside air is introduced into the protective cover 4 through the air collecting cylinder 94. The fixedly surrounded air collecting cylinder 94 evenly distributes the cold air around the protective cover 4 to help reduce the temperature inside the protective cylinder 3. After the cold air enters the protective cylinder 3, it takes away heat through natural convection or forced ventilation to achieve effective heat dissipation. After the heat dissipation operation is completed, start the servo motor 71 to rotate forward again, repeat the above process but in the opposite direction, so that the threaded sleeve 84 slides forward. When the threaded sleeve 84 moves forward, it relaxes the first pull rope 99 through the support plate 93, and the first spring ring 97 resets, pushing the baffle plate 98 back to the top of the air inlet hopper 95 to close the air inlet and restore the initial sealed state. During the above operation process, by setting the ventilation mechanism 9, cold air is introduced in time under the high temperature environment in summer, effectively reducing the temperature inside the protective cylinder 3, avoiding equipment overheating damage caused by high temperature, and ensuring the normal operation of the ultrasonic flowmeter 2.

[0038] When the present invention is in use, first connect the pipeline 1 to the external circulation pipeline 5 to ensure the normal circulation of natural gas. Wrap the connection between the two pipelines with the heat-insulating cotton 6 to initially reduce the influence of the external temperature on the internal medium. Install the entire measuring device at the connection of the pipeline 1, and use the protective cylinder 3 and the protective cover 4 to completely wrap the connection part inside to form a closed space, further protecting the internal components from the external environment. When measuring the gas flow rate in winter, start the servo motor 71 to make the driving rod 72 at its output end rotate clockwise, driving the main gear 73 to rotate synchronously. The main gear 73 is meshed and connected with the gear ring 74. Therefore, when the main gear 73 rotates, the gear ring 74 will also rotate accordingly, and the limiting rod 75 and the ball 76 roll in the limiting groove to ensure the stable movement of the gear ring 74. The rotation of the gear ring 74 drives the threaded rod 81 to rotate clockwise through the driven gear 82, and then makes the threaded sleeve 84 slide forward along the threaded rod 81. The T-shaped sliders 85 fixedly connected to both sides of the threaded sleeve 84 slide in the limiting frame 83 to ensure that the threaded sleeve 84 moves in a straight line, thereby realizing the application of pressure to the rubber airbag 10. When the threaded sleeve 84 moves forward, it triggers the inflation mechanism 11 to start working, injecting an appropriate amount of gas into the rubber airbag 10, causing it to gradually expand from a deflated state to a full state. After the rubber airbag 10 expands, it tightly squeezes the heat-insulating cotton 6, enhancing its tightness, forming a more effective heat-insulating layer, improving the heat-insulating effect and maintaining the sealing performance of the connection of the pipeline 1. When measuring the air flow rate in summer, start the servo motor 71 to reverse it. The reverse rotation of the servo motor 71 causes the driving rod 72 to drive the main gear 73 to rotate counterclockwise, and then drives the gear ring 74 to rotate counterclockwise. The counterclockwise rotation of the gear ring 74 drives the threaded rod 81 to rotate counterclockwise through the driven gear 82, causing the threaded sleeve 84 to slide backward along its axis. When the threaded sleeve 84 slides backward, it drives the special-shaped plates 12 fixed on both sides of its outer circumferential surface to move synchronously. The special-shaped plate 12 pushes the first pressing plate 13 towards the inflated rubber airbag 10, gradually compressing the space of the rubber airbag 10. The first pressing plate 13 and the second pressing plate 14 act together to form a closed pressing space, so that the gas in the rubber airbag 10 is extruded and returns to the storage cylinder 111 through the air charging pipe 118 and the connecting pipe 112 to complete the deflation process. When it is necessary to introduce cold air, start the servo motor 71 to reverse it, driving the threaded sleeve 84 to slide backward. When the threaded sleeve 84 slides backward, it pulls the first pull rope 99 through the support plate 93, overcoming the elastic force of the first spring coil 97, causing the blocking plate 98 to move downward into the air collecting cylinder 94 to open the air inlet. The external cold air is introduced into the protective cover 4 through the air collecting cylinder 94 to help reduce the temperature inside the protective cylinder 3, realizing effective heat dissipation, making the ultrasonic flowmeter 2 more accurate during measurement.

[0039] The present invention encompasses any alternatives, modifications, equivalent methods, and solutions made within the spirit and scope of the present invention. To enable the public to have a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention. However, those skilled in the art can fully understand the present invention even without the description of these details. Additionally, well-known methods, processes, procedures, components, and circuits are not described in detail to avoid unnecessary confusion to the essence of the present invention.

[0040] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. An ultrasonic flow metering device, comprising a pipeline, an ultrasonic flow meter is arranged in the middle of the outer circumference of the pipeline, and both ends of the pipeline are externally connected to flow pipelines; characterized in that: A protective cylinder is provided at the connection between the pipeline and the circulation pipeline, and protective covers are threadedly connected at both ends of the protective cylinder. The connection between the pipeline and the circulation pipeline is wrapped with thermal insulation cotton, and a rubber airbag is provided on the outer surface of the thermal insulation cotton. An adjustment mechanism is provided inside the protective cylinder, and a driving mechanism for driving the adjustment mechanism to move is also provided inside the protective cylinder. The outer circumferential surface of the rubber airbag is provided with an inflation mechanism arranged in a circumference. Among them, the driving mechanism includes a servo motor fixedly connected to both sides of the outer cylindrical surface of the pipeline, the output end of the servo motor is fixedly connected to a driving rod, the outer cylindrical surface of the driving rod is fixedly connected to a main gear, the outer surface of the main gear is meshingly connected to a gear ring, the outer cylindrical surface of the gear ring is surrounded and fixedly connected with a limiting rod, the top of the limiting rod is fixedly connected to a ball, and both sides of the outer cylindrical surface of the ball are provided with limiting plates fixedly connected to the inner wall of the protective tube, and the two limiting plates together form a limiting groove to facilitate the movement of the ball.

2. An ultrasonic flow metering device according to claim 1, characterized in that: The adjustment mechanism includes threaded rods arranged in a circle on the outer surface of the pipe, both ends of the threaded rods are provided with support seats fixedly connected to the pipe, and the threaded rods are rotatably connected in the support seats, one end of the threaded rod is fixedly connected to a driven gear, and the driven gear is meshed with a gear ring, and the driven gear and the gear ring are used together to drive the threaded rod to rotate.

3. An ultrasonic flow metering device according to claim 2, characterized in that: Limiting frames fixedly connected to the pipe are arranged on both sides of the outer cylindrical surface of the threaded rod, a threaded sleeve is threadedly connected to the outer cylindrical surface of the threaded rod, and T-shaped sliders are fixedly connected to both sides of the outer cylindrical surface of the threaded sleeve, and the T-shaped sliders are slidably connected to the limiting frames to realize the linear motion of the threaded sleeve.

4. The ultrasonic flow metering device according to claim 3, characterized in that: The inflation mechanism includes a storage cylinder fixedly connected to the outer surface of the protective cylinder, one end of the storage cylinder is fixedly connected to a connecting tube, the inner wall of the storage cylinder is fixedly connected to a clamping plate, the interior of the storage cylinder is slidably connected to a push plate, the interior of the connecting tube is slidably connected to a blocking block, and a second spring coil is fixedly connected between the blocking block and the tail end of the connecting tube, a side of the connecting tube close to the storage cylinder is fixedly connected to an inflation tube, and one end of the inflation tube passes through the protective cylinder and is fixedly connected to the rubber airbag.

5. The ultrasonic flow metering device according to claim 4, characterized in that: A support rod is fixedly connected between the push plate and the blocking round block, a second pull rope is fixedly connected to one side of the outer surface of the blocking round block, and the second pull rope passes through the connecting pipe and the protective tube and is fixedly connected to the threaded sleeve.

6. The ultrasonic flow metering device according to claim 5, characterized in that: A sealing ring is arranged at the connection point between the second pull rope and the connecting pipe, and the rubber airbag is in a circular ring shape so as to be wrapped on the outer surface of the heat-insulating cotton.

7. An ultrasonic flow metering device according to claim 6, characterized in that: Special-shaped plates are fixedly connected to both sides of the outer cylindrical surface of the threaded sleeve, one end of the special-shaped plates is fixedly connected to a first extrusion plate for extruding the rubber airbag, and a second extrusion plate is arranged on one side of the rubber airbag, and a fixed block is fixedly connected to the outer cylindrical surface of the second extrusion plate, and the first extrusion plate and the second extrusion plate are used together to realize the deflation operation of the rubber airbag.

8. The ultrasonic flow metering device according to claim 7, characterized in that: A ventilation mechanism is provided on the outer circular surface of the protective cover, and the ventilation mechanism includes an air collecting tube fixedly connected to the outer circular surface of the protective cover, an air inlet hopper is fixedly connected to the top of the air collecting tube, a blocking plate is provided inside the air inlet hopper, a fixing plate is fixedly connected to the inner upper end of the air collecting tube, a first spring ring is fixedly connected between the blocking plate and the fixing plate, and the length of the blocking plate is smaller than the inner diameter of the air collecting tube.

9. An ultrasonic flow metering device according to claim 8, characterized in that: The ventilation mechanism also includes a fixing frame fixedly connected to the outer cylindrical surface of the pipeline, an adjusting plate is hinged inside the fixing frame, the adjusting plate is provided with a support plate, a U-shaped frame is fixedly connected to the top of the threaded sleeve, one end of the support plate is hinged inside the U-shaped frame, the other end of the support plate is hinged to the bottom of the adjusting plate, a first pull rope is fixedly connected to the middle of the bottom of the blocking plate, and the first pull rope passes through the fixing plate and is fixedly connected to the adjusting plate.

10. An ultrasonic flow metering device according to claim 9, characterized in that: The blocking plate is stuck at the corner of the air inlet scoop, and the corner of the air inlet scoop is arranged at 45 degrees with the horizontal plane of the blocking plate.

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