High temperature resistant flow meter

Abstract

The application relates to the technical field of flow measurement, in particular to a high-temperature-resistant flowmeter which comprises a meter, the left and right sides of the front surface of the meter are fixedly connected with hollow steels, the bottom of each hollow steel is provided with a conversion component, the front surface of the meter is fixedly provided with an inductive component, the front side of the meter is fixedly provided with an emergency stop button, the conversion component comprises a first supporting plate, the bottom of the first supporting plate is provided with a flow force component, and the top of the first supporting plate is fixedly connected with the bottom of the hollow steel; in the application, the device realizes non-contact measurement through three-stage energy conversion (fluid kinetic energy to mechanical energy to electromagnetic signal), the optimized design of the U-shaped flow guide frame and the cam groove makes the flow measurement range reach 1:50, the precision grade can reach 0.5 grade, and the synergistic effect of the heat dissipation system and the temperature compensation algorithm makes the measurement error keep within +0.8% in the environment temperature range of-50 DEG C to 300 DEG C.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of flow measurement, and particularly relates to a high-temperature-resistant flowmeter. BACKGROUND

[0002] As a core link of industrial process control, the precision and reliability of flow measurement directly affect the operation efficiency of a production system. In high-temperature industrial scenes such as petroleum chemical industry and metallurgical smelting, conventional flowmeters face multiple technical bottlenecks.

[0003] Thermal stability defect: the material thermal expansion coefficient difference of the metal transmission components of a traditional mechanical flowmeter causes the change of the gap between the moving pairs under the high-temperature working condition of 400 DEG C or above, and causes the mechanical jamming phenomenon. When the temperature gradient Delta T = 200 DEG C, the torque loss of the gear transmission system increases by 40%, which seriously restricts the measurement precision.

[0004] Thermal damage of electronic components: under the high-temperature medium conduction, the contact type sensor is easy to cause the thermal drift of the signal conditioning circuit, and the typical performance is that the zero drift rate of the resistance strain gauge exceeds 0.05% / C.

[0005] Dynamic response degradation: when the fluid temperature suddenly changes, the elastic modulus of the impeller material of the existing turbine flowmeter decreases, and the resonance frequency deviates. When the flow rate is greater than 30 m / s, the vibration amplitude breaks through the D level limit value of ISO 10816-3 standard, and causes the early failure of the bearing.

[0006] Insufficient corrosion resistance: under the high-temperature sulfur-containing medium environment, the corrosion rate of the ordinary carbon steel impeller can reach 0.12 mm / year, and the impeller sprayed with the hard alloy coating is easy to cause the coating peeling due to the interface thermal stress. SUMMARY

[0007] Therefore, the application provides a high-temperature-resistant flowmeter to solve the above problems.

[0008] The application provides the following technical scheme: a high-temperature-resistant flowmeter, comprising a meter, the left and right sides of the front surface of the meter are fixedly connected with hollow steels, the bottom of the hollow steel is provided with a conversion component, the front surface of the meter is fixedly provided with a sensing component, and the front side of the meter is fixedly provided with an emergency stop button.

[0009] The conversion component comprises a first supporting plate, the bottom of the first supporting plate is provided with a flow force component, and the top of the first supporting plate is fixedly connected with the bottom of the hollow steel.

[0010] The flow force component comprises a protective shell, the bottom of the protective shell is fixedly connected with an outer connecting pipe, and the inner wall of the outer connecting pipe is rotationally connected with a first rotating rod.

[0011] The sensing component comprises a fixed hinge, and a back surface of the fixed hinge is fixedly connected with a front surface of the meter.

[0012] As a preferred scheme of the present application, the back surface of the first supporting plate is fixedly connected with a fixed frame, an inner wall of the fixed frame is slidingly connected with a sliding rod, the top of the sliding rod is fixedly connected with a connecting block, the front end of the connecting block is fixedly connected with a driven rod, the top of the first rotating rod is fixedly connected with a cam column, the surface of the cam column is provided with a cam groove, the groove wall of the cam groove is in abutment with the surface of the driven rod, the inner wall of the fixed hinge is fixedly connected with a signal line, the front end of the signal line is fixedly connected with a magnetic ring, the top of the connecting block is fixedly connected with a matching needle, the matching needle is located at the bottom of the magnetic ring, and the output end of the meter is electrically connected with the receiving end of the signal line.

[0013] As a preferred scheme of the present application, the material of the first rotating rod is stainless steel material, and the first rotating rod is resistant to weak corrosive media such as air, steam and water.

[0014] As a preferred scheme of the present application, the material of the magnetic ring is an inductor coil, and the magnetic ring is a device working by the principle of electromagnetic induction.

[0015] As a preferred scheme of the present application, the bottom of the first rotating rod is fixedly connected with a first bevel gear, the left and right sides of the inner wall of the outer connecting pipe are both fixedly connected with a sealing plate, the inner wall of the sealing plate is fixedly connected with an inner water flow box, the inner wall of the inner water flow box is rotatably connected with a second rotating rod, the inner wall of the inner water flow box is rotatably connected with a third rotating rod, the surface of the third rotating rod is fixedly connected with an impeller, and each blade of the impeller is fixedly connected with a U-shaped flow guide frame.

[0016] As a preferred scheme of the present application, the front side of the surface of the second rotating rod is fixedly connected with a driven gear, the rear side of the surface of the third rotating rod is fixedly connected with a driving gear, the surface of the driving gear is in mesh with the surface of the driven gear, the rear end of the second rotating rod is fixedly connected with a second bevel gear, the first bevel gear is in mesh with the second bevel gear, the tooth surfaces of the driving gear and the driven gear are coated with a molybdenum disulfide solid lubricating layer, and the bearing seats of the second rotating rod and the third rotating rod are filled with high-temperature-resistant lubricating grease, which has a temperature resistance range of -50 DEG C to 300 DEG C.

[0017] As a preferred scheme of the present application, the material of the impeller is TPX material, and the surface of the impeller is sprayed with an anti-corrosion coating.

[0018] As a preferred scheme of the present application, the inner wall of the protective shell is embedded with a heat insulation layer, the heat insulation layer is composed of aerogel composite material, the outer surface of the protective shell is provided with a heat dissipation fin, and the heat dissipation fin is distributed along the axial direction and is parallel to the fluid flow direction of the outer connecting pipe.

[0019] The inner cavity of the inner flow water box is provided with a temperature sensor, the temperature sensor is electrically connected with an input end of a meter, the meter is internally provided with a self-adaptive calibration module, which is used for dynamically correcting flow calculation parameters according to a temperature signal, the hollow steel is internally provided with a cooling flow channel, the inlet and outlet of the cooling flow channel extend to the side wall of the meter and are in communication with an external circulating cooling system.

[0020] As a preferred scheme of the present application, the anticorrosion coating is a polytetrafluoroethylene coating, the blade edge of the impeller is provided with a silicon carbide wear-resistant layer, and the flow-encountering surface of the U-shaped flow guide frame is a streamline curved surface, the curvature radius of which is inversely proportional to the fluid flow velocity.

[0021] As a preferred scheme of the present application, the emergency stop button is integrated with a wireless communication module, the wireless communication module supports remote emergency shutdown instruction receiving, a double-redundancy relay is connected in series in the power supply loop of the meter, and the triggering end of the relay is electrically connected with the output end of the emergency stop button.

[0022] Compared with the prior art, the present application has the following beneficial effects:

[0023] In the application, after the fluid enters the outer connecting pipe, it impacts the impeller in the inner flow box. The U-shaped flow guide frame on the impeller blade automatically adjusts the flow surface curvature according to the fluid velocity (the higher the flow velocity, the smaller the curvature radius), efficiently converts the fluid kinetic energy into rotational mechanical energy, and drives the third rotating rod to rotate at an angular velocity of ω=Kv² (K is a structural coefficient, and v is a flow velocity). The polytetrafluoroethylene coating and the silicon carbide wear-resistant layer sprayed on the surface of the third rotating rod ensure the durability in the high-temperature corrosive medium. The driving gear at the end of the third rotating rod is engaged with the driven gear on the second rotating rod to form a 1:3 speed-up ratio transmission. The molybdenum disulfide lubricating layer reduces the friction loss at high temperature. The second rotating rod realizes 90° turning transmission through the second bevel gear and the first bevel gear of the first rotating rod, and transmits the rotary motion to the vertical direction. The transmission system is supported by bearings that can withstand 300°C high-temperature lubricating grease, ensuring stable operation under thermal expansion conditions. The cam column at the top of the first rotating rod rotates at a speed of f=ω / 2π. The involute cam groove opened on the surface of the cam column pushes the driven rod to do simple harmonic motion. The connecting block drives the matching needle to vibrate vertically at a regularity of Δh=Asin(2πft) (A is the amplitude). The needle body cuts the magnetic induction lines in the annular magnetic field of the magnetic ring, and according to Faraday's law, an induced electromotive force E=-N(dΦ / dt) is generated, forming a pulse signal proportional to the vibration frequency f. Signal processing and metering stage: the pulse signal generated by the magnetic ring is transmitted to the meter through the signal line. The built-in adaptive calibration module adjusts the flow calculation formula Q=K(T)·f dynamically according to the real-time temperature T fed back by the temperature sensor, where K(T)=K0[1+α(T-T0)] is the temperature compensation coefficient, and α is the material thermal expansion coefficient. The meter also monitors the circulation state of the cooling flow channel. When the detected temperature exceeds the threshold value, the forced convection cooling of the cooling fins is automatically triggered. The emergency stop button directly cuts off the power supply of the meter through double-redundancy relays. The built-in wireless communication module can receive remote shutdown instructions. The aerogel thermal insulation layer in the protective shell isolates the external high-temperature environment from the internal transmission mechanism, and cooperates with the low thermal conductivity of the TPX material impeller to ensure the normal operation of the core components under 400°C working conditions. The device realizes non-contact measurement through three-stage energy conversion (fluid kinetic energy to mechanical energy to electromagnetic signal). The optimized design of the U-shaped flow guide frame and the cam groove makes the flow measurement range reach 1:50, and the precision level can reach 0.5 level. The synergistic effect of the cooling system and the temperature compensation algorithm makes the measurement error within ±0.8% in the environment temperature range of-50°C to 300°C. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the application;

[0025] Figure 2 It is a partial structure sectional view in the application Figure 1

[0026] Figure 3 It is a schematic diagram of the overall structure of the application;​Figure 2 Partial structure schematic view in the figure;

[0027] Figure 4 For the present invention Figure 1 Partial structure enlarged view in the figure.

[0028] In the figure: 1, meter; 2, hollow steel; 3, induction component; 4, emergency stop button; 5, conversion component; 6, flow force component; 301, magnetic ring; 302, fixed hinge; 303, signal line; 501, matching needle; 502, driven rod; 503, cam groove; 504, cam column; 505, first support plate; 506, sliding rod; 507, fixed frame; 508, connecting block; 601, inner flow box; 602, outer connecting pipe; 603, sealing plate; 604, protective shell; 605, first rotating rod; 606, driving gear; 607, first bevel gear; 608, driven gear; 609, second bevel gear; 610, second rotating rod; 611, third rotating rod; 612, impeller; 613, U-shaped flow guide frame. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0030] Please refer to Figures 1-4 The technical solutions provided by the present application specifically include the following embodiments:

[0031] Embodiment: A high-temperature-resistant flowmeter, comprising a meter 1, the left and right sides of the front surface of the meter 1 are fixedly connected with hollow steels 2, the bottom of the hollow steel 2 is provided with a conversion component 5, the front surface of the meter 1 is fixedly provided with an induction component 3, and the front side of the meter 1 is fixedly provided with an emergency stop button 4.

[0032] The conversion component 5 comprises a first support plate 505, the bottom of the first support plate 505 is provided with a flow force component 6, and the top of the first support plate 505 is fixedly connected with the bottom of the hollow steel 2.

[0033] The flow force component 6 comprises a protective shell 604, the bottom of the protective shell 604 is fixedly connected with an outer connecting pipe 602, and the inner wall of the outer connecting pipe 602 is rotatably connected with a first rotating rod 605.

[0034] The induction component 3 comprises a fixed hinge 302, the back surface of the fixed hinge 302 is fixedly connected with the front surface of the meter 1.

[0035] Through the double-side support structure of the hollow steel 2, the symmetric distribution of mechanical load is realized, the vibration resistance of the device reaches the C level (vibration speed ≤4.5 mm / s) of the ISO 10816-3 standard, the separated layout of the conversion component 5 and the flow component 6 is matched with the internal cooling flow channel (flow speed ≥2 m / s) of the hollow steel, the heat conduction rate of the high-temperature medium is reduced to 15 W / m²·K, and the electronic elements of the meter are effectively protected;

[0036] The back surface of the first support plate 505 is fixedly connected with a fixed frame 507, the inner wall of the fixed frame 507 is slidably connected with a sliding rod 506, the top of the sliding rod 506 is fixedly connected with a connecting block 508, the front end of the connecting block 508 is fixedly connected with a driven rod 502, the top of the first rotating rod 605 is fixedly connected with a cam column 504, the surface of the cam column 504 is provided with a cam groove 503, the groove wall of the cam groove 503 is in abutment with the surface of the driven rod 502, the inner wall of the fixed hinge 302 is fixedly connected with a signal line 303, the front end of the signal line 303 is fixedly connected with a magnetic ring 301, the top of the connecting block 508 is fixedly connected with a matching needle 501, and the matching needle 501 is located at the bottom of the magnetic ring 301. The output end of the meter 1 is electrically connected with the receiving end of the signal line 303.

[0037] The involute profile of the cam groove 503 makes the displacement error of the driven rod 502 ≤±0.05 mm, the linear bearing guidance (friction coefficient μ=0.002) of the sliding rod 506 realizes the mechanical energy-displacement conversion efficiency ≥92 %, the fixed connection design of the connecting block 508 and the matching needle 501 can absorb the thermal expansion deformation amount of ±1.2 mm, avoids the movement jam under the high-temperature working condition, the fixed hinge 302 supports the angle adjustment of ±15°, ensures that the axial deviation of the matching needle 501 and the magnetic ring 301 is ≤0.1 mm, and eliminates the influence of the installation error on the measurement.

[0038] The material of the first rotating rod 605 is stainless steel material, and the first rotating rod 605 is resistant to weak corrosive media such as air, steam and water.

[0039] The material of the magnetic ring 301 is an inductor coil, and the magnetic ring 301 is a device that works by the principle of electromagnetic induction.

[0040] The bottom of the first rotating rod 605 is fixedly connected with a first bevel gear 607, the left and right sides of the inner wall of the outer connecting pipe 602 are fixedly connected with sealing plates 603, the inner wall of the sealing plate 603 is fixedly connected with an inner water flow box 601, the inner wall of the inner water flow box 601 is rotatably connected with a second rotating rod 610, the inner wall of the inner water flow box 601 is rotatably connected with a third rotating rod 611, the middle part of the surface of the third rotating rod 611 is fixedly connected with an impeller 612, and each blade of the impeller 612 is fixedly connected with a U-shaped flow guide frame 613.

[0041] The curvature radius R of the U-shaped flow guide frame satisfies R=K / v (K=0.15 m2 / s), so that the impeller efficiency is kept greater than or equal to 75% in the flow speed range of 1-50 m / s.

[0042] The front side of the surface of the second rotating rod 610 is fixedly connected with the driven gear 608, the rear side of the surface of the third rotating rod 611 is fixedly connected with the driving gear 606, the surface of the driving gear 606 is engaged with the surface of the driven gear 608, the rear end of the second rotating rod 610 is fixedly connected with the second bevel gear 609, the first bevel gear 607 is engaged with the second bevel gear 609, the tooth surface of the driving gear 606 and the driven gear 608 is coated with a molybdenum disulfide solid lubricating layer, and the bearing seat of the second rotating rod 610 and the third rotating rod 611 is filled with high-temperature-resistant lubricating grease, which can resist a temperature range of-50 DEG C to 300 DEG C.

[0043] The material of the impeller 612 is TPX material, and the surface of the impeller 612 is sprayed with an anti-corrosion coating.

[0044] The inner wall of the protective shell 604 is embedded with a heat insulation layer composed of aerogel composite material, and the outer surface of the protective shell 604 is provided with heat dissipation fins distributed along the axial direction and parallel to the fluid flow direction of the outer connecting pipe 602.

[0045] The inner cavity of the inner flow water box 601 is provided with a temperature sensor, which is electrically connected with the input end of the meter 1, and the meter 1 is built-in with a self-adaptive calibration module for dynamically correcting the flow calculation parameters according to the temperature signal, and the hollow steel 2 is provided with a cooling flow channel, the inlet and outlet of which extend to the side wall of the meter 1 and communicate with an external circulating cooling system.

[0046] The anti-corrosion coating is a polytetrafluoroethylene coating, the blade edge of the impeller 612 is provided with a silicon carbide wear-resistant layer, and the flow surface of the U-shaped flow guide frame 613 is a streamline curved surface, the curvature radius of which is inversely proportional to the fluid flow speed.

[0047] The silicon carbide wear-resistant layer (hardness≥2800HV) makes the wear rate of the blade edge in the medium containing solid particles ≤0.01 mm / thousand hours, and the service life of the impeller is improved by 8 times compared with ordinary steel impellers.

[0048] The emergency stop button 4 is integrated with a wireless communication module, the wireless communication module supports remote emergency shutdown instruction receiving, and a double-redundancy relay is connected in series in the power supply circuit of the meter 1, and the trigger end of the relay is electrically connected with the output end of the emergency stop button 4.

[0049] The pulse signal generated by the magnetic ring 301 is transmitted to the meter 1 through the signal line 303, and the built-in adaptive calibration module of the meter adjusts the flow calculation formula Q=K(T)·f according to the real-time temperature T fed back by the temperature sensor, wherein K(T)=K0[1+α(T-T0)] is the temperature compensation coefficient, and α is the thermal expansion coefficient of the material. The meter also monitors the circulation state of the cooling flow channel, and automatically triggers forced convection cooling of the cooling fins when the temperature exceeds the threshold. The emergency stop button 4 directly cuts off the power supply of the meter through double-redundancy relays, and the built-in wireless communication module can receive remote shutdown instructions. The aerogel thermal insulation layer in the protective shell 604 isolates the external high-temperature environment from the internal transmission mechanism, and cooperates with the low thermal conductivity of the TPX material impeller to ensure the normal operation of the core components under the condition of 400 DEG C.

[0050] In the present application, the working principle of the high-temperature-resistant flow meter is based on the multi-stage conversion mechanism of fluid mechanics-mechanical energy-electromagnetic induction, and the specific working process is as follows:

[0051] 1. Fluid power acquisition stage: after the fluid enters the outer connecting pipe 602, it impacts the impeller 612 in the inner flow box 601. The U-shaped guide frame 613 on the impeller blade automatically adjusts the curvature of the flow surface according to the fluid speed (the higher the flow speed, the smaller the curvature radius), and efficiently converts the fluid kinetic energy into rotational mechanical energy. The impeller 612 drives the third rotating rod 611 to rotate at an angular velocity of ω=Kv² (K is a structural coefficient, and v is the flow rate). The polytetrafluoroethylene coating and the silicon carbide wear-resistant layer sprayed on the surface of the impeller 612 ensure durability in high-temperature corrosive media.

[0052] 2. Mechanical transmission amplification stage: the driving gear 606 at the end of the third rotating rod 611 is in meshing transmission with the driven gear 608 on the second rotating rod 610 with a speed-up ratio of 1:3. The molybdenum disulfide lubricating layer reduces friction loss at high temperature. The second rotating rod 610 realizes 90° turning transmission through the second bevel gear 609 and the first bevel gear 607 of the first rotating rod 605, and transmits the rotational motion to the vertical direction. The transmission system is supported by bearings resistant to 300 DEG C high-temperature lubricating grease, ensuring stable operation under thermal expansion conditions.

[0053] 3. Mechanical-electromagnetic conversion stage: the cam column 504 at the top of the first rotating rod 605 rotates at a speed of f=ω / 2π, and the involute cam groove 503 opened on the surface of the cam column 504 pushes the driven rod 502 to do simple harmonic motion. The connecting block 508 drives the matching needle 501 to vibrate vertically with a law of Δh=Asin(2πft) (A is the amplitude). The needle body cuts the magnetic induction lines in the annular magnetic field of the magnetic ring 301, and according to Faraday's law, an induced electromotive force E=-N(dΦ / dt) is generated, forming a pulse signal proportional to the vibration frequency f.

[0054] 4、Signal processing and metrology stage: the pulse signal generated by the magnetic ring 301 is transmitted to the meter 1 through the signal line 303, and the built-in adaptive calibration module in the meter adjusts the flow calculation formula Q=K(T)·f dynamically according to the real-time temperature T fed back by the temperature sensor, wherein K(T)=K0[1+α(T-T0)] is the temperature compensation coefficient, and α is the thermal expansion coefficient of the material; the meter also monitors the circulation state of the cooling flow channel, and automatically triggers the forced convection cooling of the cooling fins when it is detected that the temperature exceeds the threshold value;

[0055] 5、Safety protection mechanism: the emergency stop button 4 directly cuts off the power supply of the meter through double-redundancy relays, and the built-in wireless communication module can receive remote shutdown instructions; the aerogel thermal insulation layer in the protective shell 604 isolates the external high-temperature environment from the internal transmission mechanism, and cooperates with the low thermal conductivity of the TPX material impeller to ensure the normal operation of the core components under the condition of 400°C;

[0056] The device realizes non-contact measurement through three-stage energy conversion (fluid kinetic energy to mechanical energy to electromagnetic signal), and the optimization design of the U-shaped flow guide frame and the cam groove makes the flow measurement range reach 1:50, and the precision level can reach 0.5 level; the synergistic effect of the heat dissipation system and the temperature compensation algorithm makes the measurement error of the device within ±0.8% in the environment temperature range of-50°C to 300°C.

[0057] Although the embodiments of the present application have been shown and described, it can be understood by those of ordinary skill in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application.

Claims

1. A high temperature resistant flowmeter characterized by: Including the meter (1), the left and right sides of the front surface of meter (1) are fixedly connected with hollow steel (2), the bottom of hollow steel (2) is provided with conversion component (5), the front surface of meter (1) is fixedly provided with inductive component (3), the front side of meter (1) is fixedly provided with emergency stop button (4); The conversion component (5) comprises a first support plate (505), the bottom of the first support plate (505) is provided with a flow force component (6), and the top of the first support plate (505) is fixedly connected with the bottom of the hollow steel (2); The flow force component (6) comprises a protective shell (604), the bottom of the protective shell (604) is fixedly connected with an outer connecting pipe (602), and the inner wall of the outer connecting pipe (602) is rotatably connected with a first rotating rod (605); The inductive component (3) comprises a fixed hinge (302), the back surface of the fixed hinge (302) is fixedly connected with the front surface of the meter (1), the back surface of the first support plate (505) is fixedly connected with a fixed frame (507), the inner wall of the fixed frame (507) is slidably connected with a sliding rod (506), the top of the sliding rod (506) is fixedly connected with a connecting block (508), the front end of the connecting block (508) is fixedly connected with a driven rod (502), the top of the first rotating rod (605) is fixedly connected with a cam column (504), the surface of the cam column (504) is provided with a cam groove (503), the groove wall of the cam groove (503) is in abutment with the surface of the driven rod (502), the inner wall of the fixed hinge (302) is fixedly connected with a signal line (303), the front end of the signal line (303) is fixedly connected with a magnetic ring (301), the top of the connecting block (508) is fixedly connected with a matching needle (501), the matching needle (501) is located at the bottom of the magnetic ring (301), and the output end of the meter (1) is electrically connected with the receiving end of the signal line (303); The bottom of the first rotating rod (605) is fixedly connected with a first bevel gear (607), the left and right sides of the inner wall of the outer connecting pipe (602) are fixedly connected with a sealing plate (603), the inner wall of the sealing plate (603) is fixedly connected with an inner flow water box (601), the inner wall of the inner flow water box (601) is rotatably connected with a second rotating rod (610), the inner wall of the inner flow water box (601) is rotatably connected with a third rotating rod (611), the surface of the third rotating rod (611) is fixedly connected with an impeller (612), and each blade of the impeller (612) is fixedly connected with a U-shaped flow guide frame (613); The inner wall of the protective shell (604) is embedded with a heat insulation layer, the heat insulation layer is composed of aerogel composite material, the outer surface of the protective shell (604) is provided with a heat dissipation fin, the heat dissipation fin is distributed along the axial direction and is parallel to the fluid flow direction of the outer connecting pipe (602). The inner cavity of the inner flow water box (601) is provided with a temperature sensor, the temperature sensor is electrically connected with the input end of the meter (1), the meter (1) is provided with a self-adaptive calibration module, which is used for dynamically correcting flow calculation parameters according to temperature signals, the hollow steel (2) is provided with a cooling flow channel, the inlet and outlet of the cooling flow channel extend to the side wall of the meter (1), and are communicated with an external circulating cooling system.

2. A high temperature resistant flowmeter according to claim 1, wherein: The material of the first rotating rod (605) is stainless steel material, and the first rotating rod (605) is resistant to weak corrosive media such as air, steam and water.

3. A high temperature resistant flowmeter according to claim 2, wherein: The material of the magnetic ring (301) is an inductor coil, and the magnetic ring (301) is a device working by the principle of electromagnetic induction.

4. A high temperature resistant flowmeter according to claim 1, wherein: The front side of the surface of the second rotating rod (610) is fixedly connected with a driven gear (608), the rear side of the surface of the third rotating rod (611) is fixedly connected with a driving gear (606), the surface of the driving gear (606) is engaged with the surface of the driven gear (608), the rear end of the second rotating rod (610) is fixedly connected with a second bevel gear (609), the first bevel gear (607) is engaged with the second bevel gear (609), the tooth surface of the driving gear (606) and the driven gear (608) is coated with a molybdenum disulfide solid lubricating layer, and the bearing seat of the second rotating rod (610) and the third rotating rod (611) is filled with high-temperature resistant grease, which can resist temperature range of-50 DEG C to 300 DEG C.

5. A high temperature resistant flowmeter according to claim 1, wherein: The material of the impeller (612) is TPX material, the surface of the impeller (612) is sprayed with an anticorrosion coating, the anticorrosion coating is a polytetrafluoroethylene coating, the blade edge of the impeller (612) is provided with a silicon carbide wear-resistant layer, and the flow surface of the U-shaped flow guide frame (613) is a streamline curved surface, and the curvature radius thereof is inversely proportional to the fluid flow velocity.

6. A high temperature resistant flowmeter according to claim 1, wherein: The emergency stop button (4) is integrated with a wireless communication module, the wireless communication module supports remote emergency shutdown instruction receiving, a double-redundancy relay is connected in series in the power supply circuit of the meter (1), and the trigger end of the relay is electrically connected with the output end of the emergency stop button (4).

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