An electromagnetic flowmeter based on smart sensors

Abstract

This invention discloses an electromagnetic flowmeter based on a smart sensor, belonging to the field of electromagnetic flowmeter technology. It includes an outer tube and an electrode assembly. The end of the outer tube is connected to a pipe via a flange. Excitation coils are symmetrically arranged at the top and bottom of the inner fluid tube. The electrode assembly includes sleeves symmetrically arranged on both sides of the inner fluid tube. An inlet pipe is connected to the end of a first one-way valve, and the end of the delivery pipe is connected to a nozzle at the top of the inner wall of the sleeve. This electromagnetic flowmeter based on a smart sensor uses an ultrasonic sensor to detect the scaling on the end face of the electrode body in real time. When the scale thickness reaches a warning value, reagent delivery is used as the driving force to push the electrode body into the sleeve. Simultaneously, reagent is sprayed from the nozzle towards the end face of the electrode body to decompose the scale. This allows for timely treatment of the scale, preventing excessive scale thickness from affecting the accuracy of flow detection and ensuring the measurement accuracy of the electromagnetic flowmeter.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic flowmeter technology, specifically to an electromagnetic flowmeter based on a smart sensor. Background Technology

[0002] Electromagnetic flow meters measure flow rate based on Faraday's law of electromagnetic induction. They determine the flow rate by measuring the induced electromotive force generated on electrodes at both ends of a measuring tube when fluid moves through a magnetic field and cuts magnetic lines of force. Due to their unique advantages, electromagnetic flow meters are now widely used in industrial processes.

[0003] In practical use, scale inevitably forms on the electrode surfaces of existing electromagnetic flowmeters. The essence of electrode scaling is that scale-forming substances in the fluid undergo physical deposition, chemical reaction, or biological adhesion on the electrode surface, eventually forming a stable scale layer. The presence of this scale layer will affect the accuracy of flowmeter flow detection. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an electromagnetic flowmeter based on intelligent sensors, which solves the problems mentioned in the background section.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an electromagnetic flowmeter based on an intelligent sensor, comprising an outer tube and an electrode assembly. A fluid inner tube is fixed inside the outer tube. Excitation coils are symmetrically arranged at the top and bottom of the fluid inner tube. The electrode assembly includes sleeves symmetrically arranged on both sides of the fluid inner tube, with an electrode body passing through the sleeves. An ultrasonic sensor is fixed inside the electrode body, and a liquid-passing cylinder is arranged parallel to one end of the ultrasonic sensor. A piston rod passes through the end of the liquid-passing cylinder. A connecting piece is fixed to the outer wall of the electrode body, and a spring is arranged on the side of the connecting piece. A first one-way valve is arranged at the end of the outer wall of the liquid-passing cylinder near the spring, and a second one-way valve is arranged on the side of the first one-way valve. An inlet pipe is connected to the end of the first one-way valve, and a delivery pipe is connected to the end of the second one-way valve. The end of the delivery pipe is connected to a nozzle at the top of the inner wall of the sleeve.

[0006] Furthermore, the opening size of the end of the sleeve near the fluid inner tube is smaller than its internal inner diameter, and the end face of the electrode body is flush with the inner wall of the fluid inner tube.

[0007] Furthermore, the spring is sleeved outside the piston rod, and the end of the spring away from the connecting piece is connected to the end of the liquid-passing cylinder.

[0008] Furthermore, the end of the piston rod is fixedly connected to the end face of the ultrasonic sensor, and the electrode body, the ultrasonic sensor, and the liquid-passing cylinder are elastically connected through the piston rod and the spring.

[0009] Furthermore, a high-temperature resistant insulating silicone is provided in the gap between the outer wall of the ultrasonic sensor and the inner wall of the electrode body, and the housing of the ultrasonic sensor is made of an insulating and corrosion-resistant material, including but not limited to PTFE and ceramic.

[0010] Furthermore, an electromagnetic shielding layer is provided between the ultrasonic sensor and the conductive part of the electrode body. The electromagnetic shielding layer includes, but is not limited to, wrapping the sensor mounting area with copper foil or permalloy.

[0011] Furthermore, the nozzle is embedded in the top of the inner wall of the sleeve, and the nozzle is set at an angle.

[0012] Furthermore, a drain pipe is connected to the bottom of the sleeve, and a drain valve is connected to the bottom of the drain pipe.

[0013] Furthermore, the bottom end of the descaling pipe penetrates the bottom of the outer pipe, and the descaling pipe and the sleeve are arranged one-to-one. The descaling pipe is located directly below the nozzle, and the inner diameter of the descaling pipe is larger than the outer diameter of the nozzle.

[0014] Furthermore, connecting flanges are fixed at both ends of the outer tube, and sealing gaskets are provided on the sides of the connecting flanges. Grooves are provided on the surface of the sealing gaskets. A butt flange is fixed to the connecting flange by bolts, and a sealing ring is provided on the side of the butt flange. A pipeline is fixed to the side of the butt flange, and a connecting pipe is connected to the end of the pipeline.

[0015] This invention provides an electromagnetic flowmeter based on a smart sensor, which has the following advantages:

[0016] 1. This electromagnetic flowmeter based on intelligent sensors uses an ultrasonic sensor to detect the scaling on the end face of the electrode body in real time. When the scale thickness reaches a warning value, reagent delivery is used as the driving force to push the electrode body into the sleeve. At the same time, the reagent is sprayed from the nozzle toward the end face of the electrode body to decompose the scale. This can promptly deal with the scale and avoid the scale thickness from affecting the accuracy of flow detection, thus ensuring the measurement accuracy of the electromagnetic flowmeter.

[0017] 2. This electromagnetic flowmeter based on intelligent sensors targets the scale mixture generated by the decomposition of scale layer by reagent spraying. Under the thrust of subsequent reagent spraying, the scale mixture is pushed into the scale discharge pipe, where it is temporarily stored and collected. This prevents the mixture from being pushed into the inner fluid tube and causing fluid contamination when the electrode body is reset. After the electrode body is reset, the mixture can be discharged by opening the scale discharge pipe, avoiding the mixture from remaining in the scale discharge pipe for a long time. Attached Figure Description

[0018] Figure 1This is a schematic diagram of the outer tube structure of an electromagnetic flowmeter based on a smart sensor according to the present invention.

[0019] Figure 2 This is a schematic cross-sectional view of the outer tube structure of an electromagnetic flowmeter based on a smart sensor according to the present invention.

[0020] Figure 3 This is a schematic diagram of the sleeve structure of an electromagnetic flowmeter based on a smart sensor according to the present invention.

[0021] Figure 4 This is a schematic diagram of the piston rod structure of an electromagnetic flowmeter based on a smart sensor according to the present invention;

[0022] Figure 5 This is a schematic diagram of the electrode body structure of an electromagnetic flowmeter based on a smart sensor according to the present invention after separation.

[0023] Figure 6 This is a schematic diagram of the structure of an electromagnetic flowmeter based on a smart sensor according to the present invention after the connection flange and the docking flange are separated.

[0024] In the diagram: 1. Outer pipe; 2. Inner fluid pipe; 3. Excitation coil; 4. Electrode assembly; 401. Sleeve; 402. Electrode body; 403. Ultrasonic sensor; 404. Liquid passage cylinder; 405. Piston rod; 406. Connecting piece; 407. Spring; 408. First check valve; 409. Second check valve; 410. Inlet pipe; 411. Delivery pipe; 412. Scaling pipe; 413. Discharge valve; 5. Connecting flange; 6. Sealing gasket; 7. Groove; 8. Butt flange; 9. Sealing ring; 10. Pipeline; 11. Connecting pipe. Detailed Implementation

[0025] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0026] like Figures 1-5As shown, the present invention provides a technical solution: an electromagnetic flowmeter based on an intelligent sensor, comprising an outer tube 1 and an electrode assembly 4. A fluid inner tube 2 is fixed inside the outer tube 1. Excitation coils 3 are symmetrically arranged at the top and bottom of the fluid inner tube 2. The electrode assembly 4 includes sleeves 401 symmetrically arranged on both sides of the fluid inner tube 2, and an electrode body 402 passes through the sleeves 401. An ultrasonic sensor 403 is fixed inside the electrode body 402, and one end of the ultrasonic sensor 403 is parallel to a liquid-passing cylinder 40. 4. A piston rod 405 passes through the end of the liquid-passing cylinder 404. A connecting piece 406 is fixed to the outer wall of the electrode body 402, and a spring 407 is provided on the side of the connecting piece 406. A first one-way valve 408 is provided at the end of the outer wall of the liquid-passing cylinder 404 near the spring 407, and a second one-way valve 409 is provided on the side of the first one-way valve 408. The end of the first one-way valve 408 is connected to the liquid inlet pipe 410, and the end of the second one-way valve 409 is connected to the liquid delivery pipe 411. The end of the liquid delivery pipe 411 is connected to the sleeve 40. The nozzle at the top of the inner wall is connected to the sleeve 401. The opening size of the end of the sleeve 401 near the fluid inner tube 2 is smaller than its inner diameter. The end face of the electrode body 402 is flush with the inner wall of the fluid inner tube 2. The spring 407 is sleeved on the outside of the piston rod 405. The end of the spring 407 away from the connecting piece 406 is connected to the end of the liquid-passing cylinder 404. The end of the piston rod 405 is fixedly connected to the end face of the ultrasonic sensor 403. The electrode body 402 and the ultrasonic sensor 403 are connected by the piston rod 405 and the spring 407. The ultrasonic sensor 403 is elastically connected to the liquid-passing cylinder 404. A high-temperature resistant insulating silicone is provided in the gap between the outer wall of the ultrasonic sensor 403 and the inner wall of the electrode body 402. The housing of the ultrasonic sensor 403 is made of insulating and corrosion-resistant material, including but not limited to PTFE and ceramic. An electromagnetic shielding layer is provided between the ultrasonic sensor 403 and the conductive part of the electrode body 402. The electromagnetic shielding layer includes but is not limited to wrapping the sensor mounting area with copper foil or permalloy. The nozzle is embedded in the top of the inner wall of the sleeve 401 and the nozzle is set at an angle.

[0027] The specific operation is as follows: the excitation coil 3 generates a constant magnetic field in the internal cross-section of the fluid inner tube 2, and the electrode body 402 is located on both sides of the magnetic field. When the fluid flows through the inside of the fluid inner tube 2, the magnetic field exerts a force on the charged particles in the fluid, causing the positive and negative charged particles in the fluid to be separated and concentrated on both sides of the tube wall of the fluid inner tube 2. At this time, the two electrode bodies 402 detect the voltage waveform and measure it. The voltage is proportional to the fluid flow rate inside the fluid inner tube 2. Thus, together with the known cross-sectional data of the fluid inner tube 2, the actual volumetric flow rate can be calculated.

[0028] In this process, scale-forming substances in the fluid deposit on the end face of the electrode body 402 to form a scale layer. The ultrasonic sensor 403 calculates the scale layer thickness in real time by measuring the reflection time difference of the ultrasonic signal at the interface between the electrode, the scale layer, and the fluid. When the scale layer thickness reaches a warning value, the first one-way valve 408 is activated, and based on the scale layer composition, the pump body injects a descaling agent that can decompose the scale layer composition into the inlet pipe 410. The agent enters the liquid flow cylinder 404, thereby pushing the piston rod 405, causing the piston rod 405 to retract into the liquid flow cylinder 404. At this time, the spring 407 is compressed. The electrode body 402 and the ultrasonic sensor 403 are retracted into the sleeve 401 until the scaled end face of the electrode body 402 is in the position facing the nozzle. Then the second one-way valve 409 is opened. The opening degree of the second one-way valve 409 is less than that of the first one-way valve 408, so that the scaled end face of the electrode body 402 can be stably kept in the position facing the nozzle during the flow of the descaling agent. The flowing descaling agent is sprayed out from the nozzle through the infusion pipe 411 and sprayed onto the scaled end face of the electrode body 402, so that the scale layer is decomposed.

[0029] After the scale layer is decomposed, the second one-way valve 409 closes. At this time, the pump body reverses to extract the remaining reagent inside the liquid cylinder 404. At the same time, the spring 407 extends and resets, causing the piston rod 405 to extend outward, thereby pushing the electrode body 402 and the ultrasonic sensor 403 to reset, so that the end face of the electrode body 402 returns to the state of being flush with the inner wall of the fluid inner tube 2, thus continuing the subsequent flow detection operation.

[0030] The ultrasonic sensor 403 is provided with high-temperature resistant insulating silicone in the gap between the outer wall and the inner wall of the electrode body 402. This not only avoids the air layer from causing a significant attenuation of the ultrasonic waves, but also isolates the sensor from the electrode through the insulating medium to prevent current from being conducted to the sensor. The housing of the ultrasonic sensor 403 is made of insulating and corrosion-resistant material, including but not limited to PTFE and ceramic, to avoid contact with the conductive parts of the electrode. An electromagnetic shielding layer is provided between the ultrasonic sensor 403 and the conductive parts of the electrode body 402. The electromagnetic shielding layer includes, but is not limited to, wrapping the sensor mounting area with copper foil or permalloy to prevent the weak electromagnetic field generated by the transmitting and receiving modules of the ultrasonic sensor 403 from interfering with the sensing signal of the electrode.

[0031] Based on the above description, the present invention uses an ultrasonic sensor 403 to detect the scaling on the end face of the electrode body 402 in real time. When the scale thickness reaches the warning value, the electrode body 402 is retracted into the sleeve 401 by using reagent transmission as a driving force. At the same time, the reagent is sprayed from the nozzle toward the end face of the electrode body 402 to decompose the scale. This can promptly deal with the scale and avoid the scale thickness from being too thick, which would affect the accuracy of flow detection, thereby ensuring the measurement accuracy of the electromagnetic flowmeter.

[0032] like Figures 1-5 As shown, the bottom of the sleeve 401 is connected to a drain pipe 412, and the bottom of the drain pipe 412 is connected to a drain valve 413. The bottom end of the drain pipe 412 penetrates the bottom of the outer pipe 1, and the drain pipe 412 and the sleeve 401 are arranged one-to-one. The drain pipe 412 is located directly below the nozzle, and the inner diameter of the drain pipe 412 is larger than the outer diameter of the nozzle.

[0033] The specific operation is as follows: when the nozzle sprays the reagent towards the end face of the electrode body 402 to decompose the scale, the scale and the reagent are mixed and pushed into the inside of the scale drain pipe 412 for temporary storage under the force of the reagent spray. This prevents the mixture from being pushed into the inside of the fluid inner tube 2 and contaminating the fluid when the electrode body 402 is reset. When performing the scale decomposition operation, the fluid inside the fluid inner tube 2 must be emptied first to prevent the fluid from flowing into the sleeve 401 during scale decomposition. After the electrode body 402 is descaled and reset to continue operation, the scale drain pipe 412 is opened to discharge the mixture to prevent the mixture from remaining in the inside of the scale drain pipe 412 for a long time.

[0034] Based on the above description, the present invention addresses the scale mixture generated by the decomposition of scale layer by reagent spraying. Under the thrust of subsequent reagent spraying, the scale mixture is pushed into the scale drain pipe 412, thereby temporarily storing and collecting it through the scale drain pipe 412. This prevents the mixture from being pushed into the fluid inner tube 2 and causing fluid contamination when the electrode body 402 is reset. Furthermore, after the electrode body 402 is reset, the mixture can be discharged by opening the scale drain pipe 412, thus avoiding the mixture from remaining in the scale drain pipe 412 for a long time.

[0035] like Figures 1-6 As shown, connecting flanges 5 are fixed at both ends of the outer pipe 1, and a sealing gasket 6 is provided on the side of the connecting flange 5. A groove 7 is provided on the surface of the sealing gasket 6. The connecting flange 5 is fixed to the mating flange 8 by bolts, and a sealing ring 9 is provided on the side of the mating flange 8. A pipe 10 is fixed to the side of the mating flange 8, and a connecting pipe 11 is connected to the end of the pipe 10.

[0036] The specific operation is as follows: When the connecting flange 8 at the end of the outer pipe 1 is connected to the connecting flange 8 at the end of the pipeline 10 by bolts, the connecting pipe 11 is inserted into it because its outer diameter is adapted to the inner diameter of the fluid inner pipe 2, providing a stable positioning condition for the subsequent sealing ring 9 to be inserted into the groove 7 on the surface of the sealing gasket 6. When the connecting flange 8 is in contact with the connecting flange 8, the sealing ring 9 is inserted into the groove 7 on the surface of the sealing gasket 6, and the connecting flange 8 is tightly in contact with the connecting flange 8 under the action of the bolts. The resulting opposing extrusion force strengthens the tightness between the sealing ring 9 and the sealing gasket 6, thereby enhancing the sealing performance of the electromagnetic flowmeter after its two ends are connected to the pipeline 10.

[0037] In summary, when using this electromagnetic flowmeter based on intelligent sensors, the connecting pipe 11 is first inserted into the fluid inner pipe 2 because its outer diameter is compatible with the inner diameter of the fluid inner pipe 2. This provides a stable positioning condition for the sealing ring 9 to be inserted into the groove 7 on the surface of the sealing gasket 6. When the connecting flange 8 is fitted together, the sealing ring 9 is inserted into the groove 7 on the surface of the sealing gasket 6, and the connecting flange 8 is tightly fitted together by the action of the bolts. The resulting opposing compressive force strengthens the tightness between the sealing ring 9 and the sealing gasket 6. The connecting flange 8 is fixedly connected to the connecting flange 8 at the end of the pipe 10 by bolts, thereby enabling fluid transmission and allowing the fluid to pass through the inside of the fluid inner pipe 2.

[0038] The excitation coil 3 generates a constant magnetic field in the internal cross-section of the fluid inner tube 2, and the electrode body 402 is located on both sides of the magnetic field. When the fluid flows through the inside of the fluid inner tube 2, the magnetic field exerts a force on the charged particles in the fluid, causing the positive and negative charged particles in the fluid to be separated and concentrated on both sides of the tube wall of the fluid inner tube 2. At this time, the two electrode bodies 402 detect the voltage waveform and measure it. The voltage is proportional to the fluid flow rate inside the fluid inner tube 2. Thus, together with the known cross-sectional data of the fluid inner tube 2, the actual volumetric flow rate can be calculated.

[0039] In this process, scale-forming substances in the fluid deposit on the end face of the electrode body 402 to form a scale layer. The ultrasonic sensor 403 calculates the scale layer thickness in real time by measuring the reflection time difference of the ultrasonic signal at the interface between the electrode, the scale layer, and the fluid. When the scale layer thickness reaches a warning value, the first one-way valve 408 is activated, and based on the scale layer composition, the pump body injects a descaling agent that can decompose the scale layer composition into the inlet pipe 410. The agent enters the liquid flow cylinder 404, thereby pushing the piston rod 405, causing the piston rod 405 to retract into the liquid flow cylinder 404. At this time, the spring 407 is compressed. The electrode body 402 and the ultrasonic sensor 403 are retracted into the sleeve 401 until the scaled end face of the electrode body 402 is in the position facing the nozzle. Then the second one-way valve 409 is opened. The opening degree of the second one-way valve 409 is less than that of the first one-way valve 408, so that the scaled end face of the electrode body 402 can be stably kept in the position facing the nozzle during the flow of the descaling agent. The flowing descaling agent is sprayed out from the nozzle through the infusion pipe 411 and sprayed onto the scaled end face of the electrode body 402, so that the scale layer is decomposed.

[0040] When the nozzle sprays reagent towards the end face of the electrode body 402 to decompose the scale, the scale mixes with the reagent and is pushed into the drain pipe 412 for temporary storage under the force of the reagent spray. This prevents the mixture from being pushed into the fluid inner tube 2 and contaminating the fluid when the electrode body 402 is reset. During the scale decomposition operation, the fluid inside the fluid inner tube 2 must be emptied first to prevent the fluid from flowing into the sleeve 401 during scale decomposition. After the electrode body 402 is descaled and reset to continue operation, the drain pipe 412 is opened to discharge the mixture, thus preventing the mixture from remaining in the drain pipe 412 for a long time.

[0041] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.

Claims

1. An electromagnetic flowmeter based on a smart sensor, comprising an outer tube (1) and an electrode assembly (4), characterized in that: The outer tube (1) has a fluid inner tube (2) fixed inside. Excitation coils (3) are symmetrically arranged at the top and bottom of the fluid inner tube (2). The electrode assembly (4) includes sleeves (401) symmetrically arranged on both sides of the fluid inner tube (2). An electrode body (402) is inserted inside the sleeve (401). An ultrasonic sensor (403) is fixed inside the electrode body (402). A liquid-passing cylinder (404) is arranged parallel to one end of the ultrasonic sensor (403). A live wire is inserted at the end of the liquid-passing cylinder (404). A stopper rod (405) is provided. A connecting piece (406) is fixed to the outer wall of the electrode body (402), and a spring (407) is provided on the side of the connecting piece (406). A first one-way valve (408) is provided at the end of the outer wall of the liquid-passing cylinder (404) near the spring (407), and a second one-way valve (409) is provided on the side of the first one-way valve (408). An inlet pipe (410) is connected to the end of the first one-way valve (408), and an inlet pipe (411) is connected to the end of the second one-way valve (409). The inlet pipe (411) 411) The end is connected to the nozzle at the top of the inner wall of the sleeve (401). The spring (407) is sleeved on the outside of the piston rod (405), and the end of the spring (407) away from the connecting piece (406) is connected to the end of the liquid-passing cylinder (404). The end of the piston rod (405) is fixedly connected to the end face of the ultrasonic sensor (403). The electrode body (402) and the ultrasonic sensor (403) are elastically connected to the liquid-passing cylinder (404) through the piston rod (405) and the spring (407), and flow into the liquid inlet pipe (410). The descaling agent is injected and enters the liquid flow cylinder (404), thereby pushing the piston rod (405) and causing the piston rod (405) to retract into the liquid flow cylinder (404). At this time, the spring (407) is compressed, and the electrode body (402) and ultrasonic sensor (403) retract into the sleeve (401) until the scaled end face of the electrode body (402) is in the position facing the nozzle. The flowing descaling agent is sprayed from the nozzle through the infusion pipe (411) and sprayed onto the scaled end face of the electrode body (402), thereby decomposing the scale layer.

2. The electromagnetic flowmeter based on a smart sensor according to claim 1, characterized in that: The opening size of the sleeve (401) near the fluid inner tube (2) is smaller than its inner diameter, and the end face of the electrode body (402) is flush with the inner wall of the fluid inner tube (2).

3. The electromagnetic flowmeter based on a smart sensor according to claim 1, characterized in that: High-temperature resistant insulating silicone is provided in the gap between the outer wall of the ultrasonic sensor (403) and the inner wall of the electrode body (402), and the housing of the ultrasonic sensor (403) is made of insulating and corrosion resistant material, including but not limited to PTFE and ceramic.

4. The electromagnetic flowmeter based on a smart sensor according to claim 1, characterized in that: An electromagnetic shielding layer is provided between the ultrasonic sensor (403) and the conductive part of the electrode body (402). The electromagnetic shielding layer includes a sensor mounting area wrapped with copper foil or permalloy.

5. An electromagnetic flowmeter based on a smart sensor according to claim 1, characterized in that: The nozzle is embedded in the top of the inner wall of the sleeve (401) and is set at an angle.

6. The electromagnetic flowmeter based on a smart sensor according to claim 1, characterized in that: The bottom of the sleeve (401) is connected to a drain pipe (412), and the bottom of the drain pipe (412) is connected to a drain valve (413).

7. An electromagnetic flowmeter based on a smart sensor according to claim 6, characterized in that: The bottom end of the drain pipe (412) penetrates the bottom of the outer pipe (1), and the drain pipe (412) and the sleeve (401) are arranged one-to-one. The drain pipe (412) is located directly below the nozzle, and the inner diameter of the drain pipe (412) is larger than the outer diameter of the nozzle.

8. An electromagnetic flowmeter based on a smart sensor according to claim 1, characterized in that: The outer tube (1) is fixed with connecting flanges (5) at both ends, and a sealing gasket (6) is provided on the side of the connecting flange (5). The sealing gasket (6) has a groove (7) on its surface. The connecting flange (5) is fixed with a docking flange (8) by bolts, and a sealing ring (9) is provided on the side of the docking flange (8). A pipeline (10) is fixed on the side of the docking flange (8), and a connecting pipe (11) is connected to the end of the pipeline (10).

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