High temperature resistant radar level gauge

Abstract

The application provides an anti-high-temperature radar level meter, which comprises a mounting shell, an electronic unit arranged at one end of the mounting shell, an antenna unit arranged at the other end of the mounting shell, at least two waveguide tubes arranged in the mounting shell, an impedance matching cone arranged between the waveguide tubes, an inner tube arranged at the connecting position of the waveguide tubes, the connecting position of the waveguide tubes and the impedance matching cone being wrapped by the inner tube, one waveguide tube being connected with the antenna unit, the other waveguide tube being connected with the electronic unit, a heat dissipation pipe being arranged at the middle position of the mounting shell, an anti-convection heat insulation ring being further arranged in the mounting shell, the anti-convection heat insulation ring being integrally processed with the heat dissipation pipe, and the impedance matching cone comprising a middle cylindrical structure, the upper end and the lower end of the middle cylindrical structure being provided with a conical structure, and the diameter of the conical structure being smaller than the diameter of the cylindrical structure. The application can effectively prevent high-temperature air convection, the heat conducted by the heat dissipation pipe is dissipated into the air, the heat insulation and cooling effect is achieved, and the radar level meter can work under high temperature and high pressure.

Description

Technical Field

[0001] This invention belongs to the field of radar level gauge technology, and in particular relates to a high-temperature resistant radar level gauge. Background Technology

[0002] Radar level gauges calculate material level by emitting microwave pulses and measuring the time difference of their reflected echoes. With low beam energy, they can be installed in various metal and non-metal containers or pipes for non-contact, continuous measurement of the level of liquids, slurries, and granular materials. They are suitable for applications with large variations in dust, temperature, and pressure, and in the presence of inert gases and vapors. Radar level gauges are harmless to humans and the environment, and have advantages such as being unaffected by the specific gravity of the medium, unaffected by changes in dielectric constant, and requiring no on-site calibration.

[0003] The electronic components of radar level gauges are designed to operate at temperatures generally not exceeding 85°C. When measuring levels in high-temperature industrial processes, the process temperature needs to be cooled to extend the lifespan of the electronic components. For special conditions where temperatures reach 200°C or even some extreme high-temperature conditions, such as when measuring high-temperature media like molten steel, even if the high-temperature radar level gauge body has a high-temperature resistant structure, the temperature experienced by the radar will still exceed the operating standards, rendering conventional high-temperature radar level gauges unusable. Summary of the Invention

[0004] In view of this, the present invention aims to overcome the shortcomings of the above-mentioned problems in the prior art and proposes a high-temperature resistant radar level gauge.

[0005] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0006] A high-temperature resistant radar level gauge includes a mounting housing. One end of the mounting housing has an electronic unit, and the other end has an antenna unit. The mounting housing contains at least two waveguide sections with an impedance matching cone between them. An inner tube is provided at the connection point of the waveguide sections, enclosing the connection point and the impedance matching cone. One waveguide section connects to the antenna unit, and the other connects to the electronic unit. A heat dissipation pipe is located in the middle of the mounting housing. An anti-convection heat insulation ring is also provided inside the mounting housing, integrally formed with the heat dissipation pipe. The impedance matching cone includes a central cylindrical structure with tapered structures at both ends. The diameter of the tapered structures is smaller than the diameter of the cylindrical structure.

[0007] Furthermore, the waveguide is fixedly connected to the antenna unit.

[0008] Furthermore, the waveguide is press-fitted to the impedance matching cone.

[0009] Further, the impedance matching cone is made of ceramic, glass or microwave transmission medium material.

[0010] Further, the impedance matching cone is made of ceramic, glass or microwave transmission medium material.

[0011] Further, the impedance matching cone is made of ceramic, glass or microwave transmission medium material.

[0012] Further, the impedance matching cone is made of ceramic, glass or microwave transmission medium material.

[0013] Compared with the prior art, the anti-high-temperature radar level gauge has the following advantages:

[0014] The radar level gauge electronic unit is located in a heat-insulated independent space, so that component damage caused by excessively high temperature is avoided, and the radar level gauge is suitable for monitoring working conditions with extremely high temperature.

[0015] The anti-high-temperature radar level gauge can effectively prevent high-temperature airflow convection, the heat conducted by the heat dissipation pipe is dissipated into the air, heat insulation and cooling are achieved, and the radar level gauge can work under high temperature and high pressure. DETAILED DESCRIPTION

[0016] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application, and are incorporated in and constitute a part of this application. The embodiments of the present application illustrated in the drawings are presented by way of example or for purpose of illustration, and not as limitations of the present application. In the drawings:

[0017] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0018] Figure 2 It is a front view of the overall device of the anti-high-temperature radar level gauge in the embodiment of the present application;

[0019] Figure 3 It is a schematic diagram of the first impedance matching cone structure in the embodiment of the present application;

[0020] Figure 4 It is a schematic diagram of the second impedance matching cone structure in the embodiment of the present application;

[0021] Figure 5 It is a three-dimensional schematic diagram of the anti-high-temperature radar level gauge in the embodiment of the present application;

[0022] Figure 6 It is a temperature simulation diagram in the embodiment of the present application.

[0023] BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 1 - first waveguide; 2 - second waveguide; 3 - third waveguide; 4 - bolt; 5 - first impedance matching taper; 6 - inner tube; 7 - heat dissipation tube; 8 - second impedance matching taper; 9 - glass lens; 10 - sealing fixing part; 11 - anti-convection heat insulation ring; 12 - antenna unit; 13 - electronic unit; 14 - metal horn body. DETAILED DESCRIPTION

[0025] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0026] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" and the like are only for the purpose of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0027] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood through specific circumstances.

[0028] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0029] As Figure 1As shown, the present application provides a high-temperature resistant radar level gauge, which comprises a mounting shell, one end of the mounting shell is provided with an electronic unit 13, the other end of the mounting shell is provided with an antenna unit 12, at least two waveguide tubes are arranged in the mounting shell, an impedance matching cone is arranged between the waveguide tubes, an inner tube 6 is arranged at the connection of the waveguide tubes, the waveguide tube connection and the impedance matching cone are wrapped by the inner tube 6, one waveguide tube is connected with the antenna unit 12, the other waveguide tube is connected with the electronic unit 13, a heat dissipation pipe 7 is arranged at the middle position of the mounting shell, a convection-proof heat insulation ring 11 is further arranged in the mounting shell, the convection-proof heat insulation ring 11 is integrally processed with the heat dissipation pipe 7, the impedance matching cone comprises a middle cylindrical structure, the upper and lower ends of the middle cylindrical structure are provided with a tapered structure, and the diameter of the tapered structure is smaller than the diameter of the cylindrical structure. The three-dimensional schematic view of the present application is shown in Figure 5 .

[0030] In the embodiment of the present application, a plurality of waveguide tubes can be arranged as required, and the waveguide tubes are connected through the impedance matching cones, as shown in Figure 2 The structure of three waveguide tubes is shown, a first impedance matching cone 5 is arranged between the first waveguide tube 1 and the second waveguide tube 2, and a second impedance matching cone 8 is arranged between the second waveguide tube 2 and the third waveguide tube 3, wherein the first waveguide tube 1 is fixed to the antenna body PCB board of the electronic unit 13 by means of bolts 4, and the fixing structure is not limited to the bolt fixing, threaded fixing and welding connection structure, since the signal transmission inner hole requires consistent radius and concentric center, the first waveguide tube 1, the second waveguide tube 2 and the third waveguide tube 3 are connected together to realize the signal transmission of TE mode and TM mode, and a plurality of waveguide tubes are connected to form a signal transmission inner tube.

[0031] In the present application, the impedance matching cone is arranged at the transition connection of the waveguide tube to prevent the convection heat transfer effect of the internal through hole and to perform heat insulation treatment on the process temperature, and meanwhile, the matching impedance reduces the electromagnetic wave transmission loss and reflection effect. The waveguide tubes are threadedly connected, and the waveguide tubes and the impedance matching cone are press-fit connected. The impedance matching cone allows the use of ceramic, glass and suitable microwave transmission medium materials, as shown in Figures 3-4 The impedance matching cones made of different materials are different in size, and different materials can be selected for manufacturing, Figure 3 The impedance matching cone made of alumina ceramic, Figure 4 The impedance matching cone made of zirconia ceramic.

[0032] In the embodiment of the present application, there is a convection-proof heat insulation ring 11 between the two matched ceramic cones, which is a circular ring to block heat convection, and the convection-proof heat insulation ring 11 is integrally processed with the heat dissipation pipe 7. The heat dissipation pipe 7 adopts a sawtooth structure to effectively dissipate heat, and the surface heat dissipation area is increased by body processing in this example. If two waveguide pipes are used, an impedance matching cone is used to connect the two waveguide pipes, and a convection-proof heat insulation ring also needs to be arranged, which is integrally processed with the heat dissipation pipe 7.

[0033] In the embodiment of the present application, the antenna unit 12 is a lens horn antenna, which is an antenna combined by a lens 9 and a horn, and the third waveguide pipe 3 is connected to the lens horn antenna and is press-fit connected with the lens 9 by a sealing fixing member 10, and the sealing fixing member 10 is threadedly connected with the horn body. A metal horn body 14 is used in the present application, which is connected with the mounting shell by threads or welding. Since the high-temperature antenna needs to be directly contacted with a high-temperature process in application, the material at this position is required to be able to withstand high temperature. The lens is realized by using ceramic, glass, and high-temperature-resistant microwave transmission medium materials. The connection between the horn antenna and the lens part requires to be directly connected with a high-pressure process. The superimposed process conditions of high temperature and high pressure require that the sealing material can withstand high temperature, and graphite structure, graphite wound gasket, asbestos, and PTFE materials can be used. The high-temperature and high-pressure structure may face the process condition of corrosion prevention in actual application. For the corrosion prevention process condition, flange connection, sanitary connection, lens edge extension, or lens and corrosion-resistant veneer two component combination can be used to achieve.

[0034] In the present application, the antenna body and the signal transmission inner pipe can be assembled by separate processing or integral processing, and the present application adopts a split processing assembly structure.

[0035] When the split processing method is used, there is an air space between the signal transmission inner pipe (second waveguide pipe in this embodiment) and the outer pipe (heat dissipation pipe). The space has the problem of air convection heat transfer. To solve this problem, the present application uses a convection-proof heat insulation ring to avoid air heat transfer in the upper and lower space and prevent thermal damage to electronic components.

[0036] The present application enables the radar level gauge to work at 500℃ high temperature and 42 MPa high pressure. Ansys Workbench is used for simulation, and the results are as follows Figure 6 It can be seen that the device reduces the temperature from 500℃ to 56.996℃.

[0037] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A high temperature resistant radar level gauge characterized in that: The application relates to a mounting shell, one end of which is provided with an electronic unit, the other end of which is provided with an antenna unit, at least two waveguide tubes are arranged in the mounting shell, an impedance matching cone is arranged between the waveguide tubes, an inner tube is arranged at the connecting position of the waveguide tubes, the connecting position of the waveguide tubes and the impedance matching cone are wrapped through the inner tube, one waveguide tube is connected with the antenna unit, the other waveguide tube is connected with the electronic unit, a heat dissipation pipe is arranged at the middle position of the mounting shell, an anti-convection heat insulation ring is further arranged in the mounting shell, the anti-convection heat insulation ring is integrally processed with the heat dissipation pipe, the impedance matching cone comprises a middle cylindrical structure, taper structures are arranged at the upper and lower ends of the middle cylindrical structure, and the diameters of the taper structures are smaller than that of the cylindrical structure.

2. A high temperature resistant radar level gauge according to claim 1, characterized in that: The waveguide tube is fixedly connected with the antenna unit.

3. A high temperature resistant radar level gauge according to claim 1, characterized in that: The waveguide tube and the impedance matching cone are press-connected.

4. A high temperature resistant radar level gauge according to claim 1, characterized in that: The impedance matching cone is made of ceramic, glass or microwave transmission medium material.

5. A high temperature resistant radar level gauge according to claim 1, characterized in that: Impedance matching cones are arranged between the multiple waveguide tubes.

6. A high temperature resistant radar level gauge according to claim 1, characterized in that: The waveguide tube and the antenna unit are press-connected through a sealing fixing piece.

7. A high temperature resistant radar level gauge according to claim 1, characterized in that: The heat dissipation pipe adopts a sawtooth structure and is processed on the mounting shell body.

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