Wet steam flowmeter

Abstract

The invention discloses a wet steam flowmeter which comprises a measuring tube, a pressure tapping tube, a valve and a differential pressure transmitter, a fixed pore plate is fixedly arranged in the measuring tube, and a cleaning mechanism is arranged at one end of the fixed pore plate; the cleaning mechanism comprises a scraping barrel and a collecting barrel, the scraping barrel is rotationally arranged in the measuring pipe, an opening is formed in the bottom of the measuring pipe and located at the scraping barrel, the top of the collecting barrel is fixedly connected with the measuring pipe and communicated with the opening, the scraping barrel is provided with a discharging port with the same size as the opening, and the section of the collecting barrel is in a convex shape; an inner cavity of the material collecting barrel can be divided into a first cavity and a second cavity vertically, a fixing cover is arranged at the bottom of the first cavity, and one end of the fixing cover is rotationally connected with the material collecting barrel. By arranging the cleaning mechanism, when fluid flows in the measuring pipe, the fan blades and the scraping cylinder can be driven to rotate, and when the scraping cylinder rotates, impurities attached to the fixed pore plate can be scraped off, so that small-particle solids on the fixed pore plate can be automatically cleaned, and the fixed pore plate can be prevented from being blocked.

Description

Technical Field

[0001] The present invention relates to the technical field of wet steam metering, and particularly to a wet steam flowmeter. Background Art

[0002] A wet steam flowmeter is a special instrument for measuring the flow rate of steam containing liquid water (i.e., wet steam). Wet steam flowmeters are widely used in industries such as petroleum, chemical, pharmaceutical, and food processing. During application, they mainly monitor the wet steam flow rate generated by equipment such as boilers and reactors to ensure process stability and energy utilization efficiency.

[0003] Common wet steam flowmeters mainly consist of components such as orifice plates, differential pressure transmitters, and temperature and pressure sensors. The wet steam flowmeter is connected to the pipeline through a connecting flange and a measuring pipe. The orifice plate is located inside the measuring pipe, the differential pressure transmitter is connected to the measuring pipe through a connecting pipe, and the temperature and pressure sensors are arranged outside the measuring pipe. The detection probes of the temperature and pressure sensors pass through the measuring pipe and reach the inside of the measuring pipe. When there is fluid passing through the measuring channel, the temperature and pressure sensors can measure the instantaneous flow rate of the fluid. The orifice plate can change the flow velocity of the fluid inside the measuring pipe, making the pressure values on both sides of the orifice plate different.

[0004] However, in the above solution, since some wet steam contains small particulate solids that are insoluble in water, when the wet steam containing small particulate solids passes through the orifice plate, some small particulate solids will adhere to the orifice plate. When there are more small particulate solids on the orifice plate, the small particulate solids will accumulate on one side of the orifice plate, thus blocking the small holes of the orifice plate and further causing inaccurate measurement results. Summary of the Invention

[0005] The purpose of the present invention is to provide a wet steam flowmeter that can self-clean small particulate solids inside the measuring pipe and prevent blockage of the measuring pipe.

[0006] To achieve the above object, a wet steam flowmeter is provided, which includes a measuring pipe, a pressure tapping pipe, a valve, and a differential pressure transmitter. Fixed flanges are provided at both ends of the measuring pipe, and the two fixed flanges are connected to the pipeline. There are two pressure tapping pipes, and both ends of the two pressure tapping pipes are connected to the measuring pipe, and the other ends of the two pressure tapping pipes are connected to the differential pressure transmitter, and a valve is provided at the connection. A fixed orifice plate is fixedly arranged in the measuring pipe, and a cleaning mechanism is arranged at one end of the fixed orifice plate; the cleaning mechanism includes a scraping cylinder and a collecting cylinder. The scraping cylinder is rotatably arranged in the measuring pipe, and an opening is provided at the bottom of the measuring pipe at the position of the scraping cylinder. The top of the collecting cylinder is fixedly connected to the measuring pipe and communicated with the opening. The scraping cylinder is provided with a discharge port having the same size as the opening. The cross-section of the collecting cylinder is convex, and the inner cavity of the collecting cylinder can be divided into a first chamber and a second chamber up and down. A fixed cover is provided at the bottom of the first chamber. One end of the fixed cover is rotatably connected to the collecting cylinder, and a convex block is provided at the other end of the fixed cover. A connecting block is rotatably arranged at the top of the convex block, and a pressing rod is rotatably arranged at the top of the connecting block. The pressing rod is located outside the top of the collecting cylinder, and the top of the pressing rod is inserted into the opening, and the top of the pressing rod abuts against the outer surface of the scraping cylinder. A spring is provided at the top end of the pressing rod, and the spring is located at the bottom of the measuring pipe.

[0007] The working principle of the present invention: This flowmeter is suitable for measuring the flow of wet steam containing impurities. When installing this flowmeter on the pipeline, place the measuring pipe between two pipelines, and connect the fixed flanges at both ends of the measuring pipe to the corresponding fixed flanges on the pipeline, so that the measuring pipe is connected to the pipeline. Install the differential pressure transmitter around the measuring pipe, and the differential pressure transmitter is connected to the measuring pipe through the pressure tapping pipe. Among them, valves are provided at the connections between the differential pressure transmitter and the pressure tapping pipes. A sensor is fixedly installed outside the measuring pipe, and the detection needle of the sensor is located inside the measuring pipe. The differential pressure transmitter and the sensor are both prior arts and will not be described in detail here. When there is fluid flowing in the measuring pipe, the sensor can measure data such as the flow rate and temperature of the fluid. Part of the flowing fluid in the measuring pipe can reach the differential pressure transmitter through the pressure tapping pipe, and the differential pressure transmitter can convert the differential pressure signal of the fluid into a standard signal; when the fluid passes through the measuring pipe, it first flows through the scraping cylinder, then through the fixed orifice plate, and finally flows out of the measuring pipe. When the cleaning mechanism works, the scraping cylinder can rotate driven by the fluid. When the scraping cylinder rotates, the end of the scraping cylinder in contact with the fixed orifice plate can scrape the impurities adhering to the fixed orifice plate into the scraping cylinder. When the discharge port of the scraping cylinder rotates to the opening of the measuring pipe, the inner cavity of the scraping cylinder is communicated with the collecting cylinder, and the impurities in the scraping cylinder can fall into the collecting cylinder. At this time, the pressing rod is in a natural state, and the fixed cover is arranged horizontally. The fixed cover can close the middle of the collecting cylinder. When the scraping cylinder rotates and the scraping cylinder covers the opening of the measuring pipe, at this time the pressing rod is squeezed, and the pressing rod squeezes the other end of the fixed cover, causing the fixed cover to rotate, and the fixed cover is in an inclined state, and the collecting cylinder is in a communicating state. The impurities in the collecting cylinder can be discharged from the bottom of the collecting cylinder. During this process, the spring can drive the pressing rod to move upward.

[0008] According to the wet steam flowmeter described above, two annular ridges are arranged at intervals on the outer side of the scraping cylinder, and two grooves for accommodating the ridges are arranged at intervals on the inner side of the measuring pipe.

[0009] By arranging a ridge on the outer side of the scraping groove and allowing the ridge to slide in the groove of the measuring pipe, the scraping cylinder can be prevented from moving along the axis direction of the measuring pipe during rotation; a filling material can be added in the groove to reduce the gap between the ridge and the groove and ensure its airtightness.

[0010] According to the wet steam flowmeter described above, a connecting rod is arranged along the axis direction inside the scraping cylinder, both ends of the connecting rod are fixedly connected to both ends of the scraping cylinder, and a fan blade is arranged inside the scraping cylinder, and the fan blade is fixedly sleeved on the connecting rod.

[0011] When the fluid flows through the measuring pipe, the flowing fluid can drive the fan blade to rotate, and the rotation of the fan blade can drive the scraping cylinder to rotate.

[0012] According to the wet steam flowmeter described above, an arc-shaped through groove is formed in the scraping cylinder, the arc length of the through groove is greater than the arc length of the discharge port, and the top of the pressure rod is arranged opposite to the through groove.

[0013] By setting the arc length of the through groove to be greater than the arc length of the discharge port, when the discharge port approaches the opening of the measuring pipe, the pressure rod can first pass through the through groove, so that the pressure rod is in a natural state and the fixed cover is in a horizontal state. When the discharge port just leaves the opening of the measuring pipe, the pressure rod is still in a natural state, and the fixed cover can seal the aggregate cylinder, so that the aggregate cylinder can be in a sealed state during the process of the discharge port approaching and leaving the opening of the measuring pipe, thereby ensuring its airtightness.

[0014] According to the wet steam flowmeter described above, an adjusting orifice plate is arranged on the other side of the cleaning mechanism of the fixed orifice plate. The adjusting orifice plate is rotatably connected to the fixed orifice plate. A dial block is arranged at the top of the adjusting orifice plate. A driving chamber is formed in the measuring pipe at the position of the dial block, and an electric push rod is arranged in the driving chamber. The output end of the electric push rod is rotatably connected to the dial block.

[0015] A plurality of through holes are arranged on both the fixed orifice plate and the adjusting orifice plate. When the through holes on the fixed orifice plate and the adjusting orifice plate correspond to each other one by one, the maximum flowable range in the measuring pipe is available. When the adjusting orifice plate rotates and the through holes on the adjusting orifice plate are arranged in a staggered manner with the through holes on the fixed orifice plate, the minimum flowable range in the measuring pipe is available; when the electric push rod extends, the movable end of the electric push rod pushes the dial block on the adjusting orifice plate, thereby causing the adjusting orifice plate to rotate.

[0016] According to the wet steam flowmeter described above, the connection position of one pressure-taking pipe and the measuring pipe is located on the side of the fixed orifice plate facing away from the adjusting orifice plate, and the connection position of the other pressure-taking pipe and the measuring pipe is located on the side of the adjusting orifice plate facing away from the fixed orifice plate.

[0017] The pressure-taking pipe located on the side of the fixed orifice plate facing away from the adjusting orifice plate can convey a part of the fluid in the measuring pipe to the differential pressure transmitter, and the pressure-taking pipe located on the side of the adjusting orifice plate facing away from the fixed orifice plate can convey the fluid in the differential pressure transmitter back to the measuring pipe.

[0018] The beneficial effects of a wet steam flowmeter in the present invention are as follows: 1. By providing a cleaning mechanism, when there is fluid flowing in the measuring pipe, the fan blades and the scraping cylinder can be driven to rotate. When the scraping cylinder rotates, the impurities adhered to the fixed orifice plate can be scraped off, so that the small particle solids on the fixed orifice plate can be self-cleaned, and the blockage of the fixed orifice plate can be prevented.

[0019] 2. By providing a discharge port on the scraping cylinder, when the discharge port is communicated with the opening of the measuring pipe, the impurities in the scraping cylinder can fall to the aggregate cylinder at the opening of the measuring pipe, and thus the impurities in the scraping cylinder can be cleaned.

[0020] The additional aspects and advantages of the present invention will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present invention. Description of the Drawings

[0021] The present invention will be further described below in conjunction with the drawings and embodiments; Figure 1 It is a perspective view of a wet steam flowmeter.

[0022] Figure 2 It is a front view sectional view of the measuring pipe of a wet steam flowmeter.

[0023] Figure 3 It is a perspective view of the scraping cylinder of a wet steam flowmeter.

[0024] Figure 4 It is a sectional perspective view of the aggregate cylinder of a wet steam flowmeter.

[0025] Figure 5 It is a perspective view of the fixed orifice plate and the adjusting orifice plate of a wet steam flowmeter.

[0026] Wherein: 1. Measuring pipe; 11. Fixed flange; 12. Fixed orifice plate; 13. Adjusting orifice plate; 131. Pushing block; 14. Groove; 15. Driving chamber; 151. Electric push rod; 2. Pressure-taking pipe; 3. Valve; 4. Differential pressure transmitter; 5. Cleaning mechanism; 51. Scraping cylinder; 511. Discharge port; 512. Convex edge; 513. Connecting rod; 514. Fan blade; 52. Aggregate cylinder; 521. First chamber; 522. Second chamber; 523. Fixed cover; 524. Convex block; 525. Connecting block; 526. Pressing rod; 527. Spring. Detailed Embodiments

[0027] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The function of the drawings is to supplement the description in the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present invention. However, it should not be construed as a limitation on the protection scope of the present invention.

[0028] In the description of the present invention, it should be understood that with respect to the orientation description, such as the orientation or positional relationship indicated by up, down, front, back, left, right, etc., is based on the orientation or positional relationship shown in the accompanying drawings. It is 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. Therefore, it should not be construed as a limitation on the present invention.

[0029] In the description of the present invention, greater than, less than, exceeding, etc. are understood as not including the number itself, and above, below, within, etc. are understood as including the number itself. If there is a description of first and second, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or the sequence relationship of the indicated technical features.

[0030] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installation, connection, etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0031] Refer to Figures 1-5, a wet steam flowmeter according to the present invention includes: a measuring pipe 1, a pressure tapping pipe 2, a valve 3, and a differential pressure transmitter 4. Fixed flanges 11 are provided at both ends of the measuring pipe 1, and the two fixed flanges 11 are communicated with the pipeline. There are two pressure tapping pipes 2, and both ends of the two pressure tapping pipes 2 are communicated with the measuring pipe 1. The other ends of the two pressure tapping pipes 2 are both communicated with the differential pressure transmitter 4, and a valve 3 is provided at the connection. A fixed orifice plate 12 is fixedly arranged in the measuring pipe 1, and a cleaning mechanism 5 is arranged at one end of the fixed orifice plate 12; the cleaning mechanism 5 includes a scraping cylinder 51 and a collecting cylinder 52. The scraping cylinder 51 is rotatably arranged in the measuring pipe 1. An opening is provided at the bottom of the measuring pipe 1 at the position of the scraping cylinder 51. The top of the collecting cylinder 52 is fixedly connected to the measuring pipe 1 and communicated with the opening. The scraping cylinder 51 is provided with a discharge port 511 having the same size as the opening. The cross-section of the collecting cylinder 52 is convex. The inner cavity of the collecting cylinder 52 can be divided into an upper first chamber 521 and a lower second chamber 522. A fixed cover 523 is provided at the bottom of the first chamber 521. One end of the fixed cover 523 is rotatably connected to the collecting cylinder 52. A convex block 524 is provided at the other end of the fixed cover 523. A connecting block 525 is rotatably arranged at the top of the convex block 524. A pressing rod 526 is rotatably arranged at the top of the connecting block 525. The pressing rod 526 is located outside the top of the collecting cylinder 52. The top of the pressing rod 526 is inserted into the opening, and the top of the pressing rod 526 abuts against the outer surface of the scraping cylinder 51. A spring 527 is provided at the top end of the pressing rod 526, and the spring 527 is located at the bottom of the measuring pipe 1.

[0032] Specifically, this flowmeter is applicable to the measurement of the flow rate of wet steam containing impurities. When installing this flowmeter on a pipeline, place the measuring tube 1 between two pipelines. The fixed flanges 11 at both ends of the measuring tube 1 are connected to the fixed flanges 11 on the corresponding pipelines, so that the measuring tube 1 is communicated with the pipeline. Install the differential pressure transmitter around the measuring tube 1. The differential pressure transmitter 4 is communicated with the measuring tube 1 through the pressure tapping tube 2. Among them, valves 3 are provided at the connection points of the differential pressure transmitter 4 and the pressure tapping tube 2. A sensor is fixedly installed outside the measuring tube 1, and the detection needle of the sensor is located inside the measuring tube 1. The differential pressure transmitter 4 and the sensor are both prior arts and will not be described in detail here. When there is fluid flowing in the measuring tube 1, the sensor can measure data such as the flow rate and temperature of the fluid. Part of the flowing fluid in the measuring tube 1 can reach the differential pressure transmitter 4 through the pressure tapping tube 2, and the differential pressure transmitter 4 can convert the differential pressure signal of the fluid into a standard signal; when the fluid passes through the measuring tube 1, it first flows through the scraping cylinder 51, then passes through the fixed orifice plate 12, and finally flows out of the measuring tube 1. When the cleaning mechanism 5 works, the scraping cylinder 51 can rotate under the drive of the fluid. When the scraping cylinder 51 rotates, one end of the scraping cylinder 51 in contact with the fixed orifice plate 12 can scrape the impurities adhering to the fixed orifice plate 12 into the scraping cylinder 51. When the discharge port 511 of the scraping cylinder 51 rotates to the opening of the measuring tube 1, the inner cavity of the scraping cylinder 51 is communicated with the aggregate cylinder 52, and the impurities in the scraping cylinder 51 can fall into the aggregate cylinder 52. At this time, the pressure rod 526 is in a natural state, and the fixed cover 523 is arranged horizontally. The fixed cover 523 can close the middle part of the aggregate cylinder 52. When the scraping cylinder 51 rotates and the scraping cylinder 51 covers the opening of the measuring tube 1, at this time, the pressure rod 526 is squeezed, and the pressure rod 526 squeezes the other end of the fixed cover 523, so that the fixed cover 523 rotates. The fixed cover 523 is in an inclined state, and the aggregate cylinder 52 is in a communicating state. The impurities in the aggregate cylinder 52 can be discharged from the bottom of the aggregate cylinder 52. During this process, the spring 527 can drive the pressure rod 526 to move upward.

[0033] Optionally, two annular ridges 512 are arranged at intervals on the outer side of the scraping cylinder 51, and two grooves 14 for accommodating the ridges 512 are arranged at intervals on the inner side of the measuring tube 1.

[0034] Optionally, a connecting rod 513 is arranged along the axial direction inside the scraping cylinder 51. Both ends of the connecting rod 513 are fixedly connected to both ends of the scraping cylinder 51. A fan blade 514 is arranged inside the scraping cylinder 51, and the fan blade 514 is fixedly sleeved on the connecting rod 513.

[0035] Optionally, the scraping cylinder 51 is provided with an arc-shaped through groove. The arc length of the through groove is greater than the arc length of the discharge port 511, and the top of the pressure rod 526 is arranged opposite to the through groove.

[0036] Optionally, an adjustment orifice plate 13 is provided on the other side of the cleaning mechanism 5 of the fixed orifice plate 12. The adjustment orifice plate 13 is rotatably connected to the fixed orifice plate 12. A dial block 131 is provided at the top of the adjustment orifice plate 13. A drive chamber 15 is provided in the measuring tube 1 at the position of the dial block 131. An electric push rod 151 is provided in the drive chamber 15. The output end of the electric push rod 151 is rotatably connected to the dial block 131.

[0037] Optionally, the connection between one of the pressure tapping pipes 2 and the measuring tube 1 is located on the side of the fixed orifice plate 12 facing away from the adjustment orifice plate 13, and the connection between the other pressure tapping pipe 2 and the measuring tube 1 is located on the side of the adjustment orifice plate 13 facing away from the fixed orifice plate 12.

[0038] Specifically, when there is fluid flowing in the measuring tube 1, the sensor can measure data such as the flow rate and temperature of the fluid. Part of the fluid flowing in the measuring tube 1 can reach the differential pressure transmitter 4 through the pressure tapping pipe 2. The differential pressure transmitter 4 can convert the differential pressure signal of the fluid into a standard signal; when the fluid passes through the measuring tube 1, it first flows through the scraping cylinder 51, then through the fixed orifice plate 12, and finally flows out of the measuring tube 1. When the cleaning mechanism 5 works, the scraping cylinder 51 can rotate driven by the fluid. When the scraping cylinder 51 rotates, one end of the scraping cylinder 51 in contact with the fixed orifice plate 12 can scrape off the impurities adhering to the fixed orifice plate 12 into the scraping cylinder 51. When the discharge port 511 of the scraping cylinder 51 rotates to the opening of the measuring tube 1, the inner cavity of the scraping cylinder 51 is connected to the aggregate cylinder 52, and the impurities in the scraping cylinder 51 can fall into the aggregate cylinder 52. At this time, the pressure rod 526 is in a natural state, and the fixed cover 523 is arranged horizontally. The fixed cover 523 can seal the middle of the aggregate cylinder 52. When the scraping cylinder 51 rotates and the scraping cylinder 51 covers the opening of the measuring tube 1, at this time the pressure rod 526 is squeezed, and the pressure rod 526 squeezes the other end of the fixed cover 523, causing the fixed cover 523 to rotate. The fixed cover 523 is in an inclined state, and the aggregate cylinder 52 is in a connected state. The impurities in the aggregate cylinder 52 can be discharged from the bottom of the aggregate cylinder 52. During this process, the spring 527 can drive the pressure rod 526 to move upward; by providing the cleaning mechanism 5, when there is fluid flowing in the measuring tube 1, the fan blade 514 and the scraping cylinder 51 can be driven to rotate. When the scraping cylinder 51 rotates, the impurities adhering to the fixed orifice plate 12 can be scraped off, so that the small particle solids on the fixed orifice plate 12 can be self-cleaned, and the fixed orifice plate 12 can be prevented from being blocked; When the edge of the arc-shaped through groove on the scraping cylinder 51 is misaligned with the top of the pressing rod 526 of the measuring tube 1, the top of the pressing rod 526 abuts against the outer side wall of the scraping cylinder 51, the pressing rod 526 moves downward, the spring 527 is stretched. During the process of the pressing rod 526 moving downward, the other end of the fixed cover 523 moves downward accordingly. At this time, one end of the fixed cover 523 rotates, and the fixed cover 523 is in an inclined state, and the aggregate cylinder 52 is in a communicating state, and the impurities in the aggregate cylinder 52 can be discharged from the aggregate cylinder 52; when the scraping cylinder 51 rotates and the top of the pressing rod 526 passes through the arc-shaped through groove on the scraping cylinder 51, the top of the pressing rod 526 is not squeezed, the spring 527 returns to its natural state, and the spring 527 drives the pressing rod 526 to move upward, that is to say, the top of the pressing rod 526 is located inside the scraping cylinder 51. During this process, the end of the fixed cover 523 connected to the pressing rod 526 moves upward, so that the fixed cover 523 returns from the inclined state to the horizontal state. At this time, the fixed cover 523 can block the aggregate cylinder 52. When the scraping cylinder 51 continues to rotate and the discharge port 511 is communicated with the opening of the measuring tube 1, the impurities in the scraping cylinder 51 can fall onto the fixed cover 523.

[0039] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments by using the above-disclosed technical content without departing from the technical solution scope of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the technical solution content of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A wet steam flowmeter, characterized in that, Including: A measuring tube, a pressure tapping tube, valves and a differential pressure transmitter. Fixed flanges are provided at both ends of the measuring tube, and the two fixed flanges are communicated with the pipeline. There are two pressure tapping tubes, and both ends of the two pressure tapping tubes are communicated with the measuring tube. The other ends of the two pressure tapping tubes are both communicated with the differential pressure transmitter, and valves are provided at the connection points. A fixed orifice plate is fixedly arranged in the measuring tube, and a cleaning mechanism is arranged at one end of the fixed orifice plate; The cleaning mechanism includes a scraping cylinder and an aggregate cylinder. The scraping cylinder is rotatably arranged in the measuring tube. An opening is provided at the bottom of the measuring tube at the position of the scraping cylinder. The top of the aggregate cylinder is fixedly connected to the measuring tube and communicated with the opening. The scraping cylinder is provided with a discharge port having the same size as the opening. The cross-section of the aggregate cylinder is convex. The inner cavity of the aggregate cylinder can be divided into a first chamber and a second chamber up and down. A fixed cover is provided at the bottom of the first chamber. One end of the fixed cover is rotatably connected to the aggregate cylinder. A convex block is provided at the other end of the fixed cover. A connecting block is rotatably arranged at the top of the convex block. A pressing rod is rotatably arranged at the top of the connecting block. The pressing rod is located outside the top of the aggregate cylinder. The top of the pressing rod is inserted into the opening, and the top of the pressing rod abuts against the outer surface of the scraping cylinder. A spring is provided at the top end of the pressing rod, and the spring is located at the bottom of the measuring tube.

2. The wet steam flowmeter according to claim 1, characterized in that, Two annular ridges are arranged at intervals on the outer side of the scraping cylinder, and two grooves capable of accommodating the ridges are arranged at intervals on the inner side of the measuring tube.

3. The wet steam flowmeter according to claim 1, wherein, A connecting rod is arranged along the axis direction in the scraping cylinder, and both ends of the connecting rod are fixedly connected to both ends of the scraping cylinder. A fan blade is arranged in the scraping cylinder, and the fan blade is fixedly sleeved on the connecting rod.

4. The wet steam flowmeter according to claim 1, wherein An arc-shaped through groove is formed in the scraping cylinder. The arc length of the through groove is greater than the arc length of the discharge port. The top of the pressing rod is arranged opposite to the through groove.

5. A wet steam flowmeter according to claim 1, characterized in that, An adjusting orifice plate is arranged on the other side of the fixed orifice plate of the cleaning mechanism. The adjusting orifice plate is rotatably connected to the fixed orifice plate. A dial block is arranged at the top of the adjusting orifice plate. A driving chamber is formed in the measuring tube at the position of the dial block. An electric push rod is arranged in the driving chamber, and the output end of the electric push rod is slidably connected to the dial block.

6. The wet steam flowmeter according to claim 1, characterized in that, The connection point of one pressure tapping tube and the measuring tube is located on the side of the fixed orifice plate facing away from the adjusting orifice plate, and the connection point of the other pressure tapping tube and the measuring tube is located on the side of the adjusting orifice plate facing away from the fixed orifice plate.

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