High-temperature-resistant radar level meter

Abstract

The invention provides a high-temperature-resistant radar level meter which comprises an installation shell, an electronic unit is arranged at one end of the installation shell, an antenna unit is arranged at the other end of the installation shell, at least two waveguide tubes are arranged in the installation shell, an impedance matching cone is arranged between the waveguide tubes, and 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 tube is arranged in the middle of the installation shell, an anti-convection heat insulation ring is further arranged in the installation shell, and the anti-convection heat insulation ring and the heat dissipation tube are integrally machined. The impedance matching cone comprises a middle cylinder structure, the upper end and the lower end of the middle cylinder structure are each provided with a conical structure, and the diameter of each conical structure is smaller than that of the cylinder structure. High-temperature airflow convection can be effectively prevented, conducted heat is dissipated into air through the heat dissipation pipe, the heat insulation and cooling effects are achieved, and the radar level meter can work at high temperature and high pressure.

Description

Technical Field

[0001] The invention belongs to the technical field of radar level meters, and in particular relates to a high-temperature resistant radar level meter. Background Art

[0002] Radar level meters calculate material levels by emitting microwave pulses and measuring the time difference between reflected echoes. Their low beam energy allows them to be installed in various metal and non-metal containers or pipes, providing non-contact, continuous level measurement of liquids, slurries, and granular materials. They are suitable for applications subject to dust, large temperature and pressure fluctuations, and the presence of inert gases and steam. Radar level meters are harmless to humans and the environment, unaffected by the specific gravity of the medium or changes in dielectric constant, and require no on-site calibration.

[0003] The electronic part of the radar level meter is generally designed to operate at a temperature not exceeding 85°C. When measuring the level of a high-temperature industrial process, the process temperature needs to be cooled to extend the life of the electronic part. For special working conditions with temperatures reaching 200°C or even some extremely high temperatures, such as measuring high-temperature media such as molten steel, even if the high-temperature radar level meter body has a high-temperature resistant structure, the temperature to which the radar is subjected will still exceed the operating standard, making conventional high-temperature radar level meters unusable. Summary of the Invention

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

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

[0006] A high-temperature resistant radar level meter comprises a mounting shell, an electronic unit being provided at one end of the mounting shell, an antenna unit being provided at the other end of the mounting shell, at least two waveguide sections being provided in the mounting shell, an impedance matching cone being provided between the waveguide sections, an inner tube being provided at the waveguide section connection, the waveguide section connection and the impedance matching cone being wrapped by the inner tube, one waveguide section being connected to the antenna unit, the other waveguide section being connected to the electronic unit, a heat dissipation pipe being provided in the middle of the mounting shell, an anti-convection heat insulation ring being further provided in the mounting shell, the anti-convection heat insulation ring being integrally processed with the heat dissipation pipe, the impedance matching cone comprising an intermediate cylindrical structure, the upper and lower ends of the intermediate cylindrical structure being provided with a conical structure, the diameter of the conical structure being smaller than the diameter of the cylindrical structure.

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

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

[0009] Furthermore, the impedance matching cone is made of ceramics, glass, or a medium material suitable for microwave transmission.

[0010] Furthermore, impedance matching cones are provided between the plurality of waveguide tubes.

[0011] Furthermore, the waveguide tube and the antenna unit are press-fitted and connected using a sealing fixing piece.

[0012] Furthermore, the heat dissipation pipe adopts a serrated structure, which is achieved by processing on the mounting shell body.

[0013] Compared with the existing technology, the high temperature resistant radar level meter described in the present invention has the following advantages:

[0014] The present invention can place the electronic unit of the radar level meter in an independent, heat-insulated space, thus preventing damage to components caused by excessive temperatures, and is suitable for monitoring conditions under extremely high temperatures.

[0015] The present invention can effectively prevent high-temperature airflow convection, and the heat dissipation pipe dissipates the conducted heat into the air, playing a role of heat insulation and cooling, so that the radar level meter can work under high temperature and high pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

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

[0018] Figure 2 This is a front view of the overall device of the high temperature resistant radar level meter in an embodiment of the present invention;

[0019] Figure 3 Schematic diagram of the first impedance matching cone structure in an embodiment of the present invention;

[0020] Figure 4 Schematic diagram of the second impedance matching cone structure in an embodiment of the present invention;

[0021] Figure 5 A three-dimensional schematic diagram of a high-temperature resistant radar level meter according to an embodiment of the present invention;

[0022] Figure 6 This is a temperature simulation diagram in an embodiment of the present invention.

[0023] Description of Reference Numerals

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

[0025] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are 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, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0027] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

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

[0029] like Figure 1As shown, the present invention provides a high-temperature resistant radar level meter, including a mounting shell, an electronic unit 13 is provided at one end of the mounting shell, an antenna unit 12 is provided at the other end of the mounting shell, at least two sections of waveguide tubes are provided in the mounting shell, an impedance matching cone is provided between the waveguide tubes, an inner tube 6 is provided at the waveguide tube connection, the waveguide tube connection and the impedance matching cone are wrapped by the inner tube 6, one section of the waveguide tube is connected to the antenna unit 12, and the other section of the waveguide tube is connected to the electronic unit 13, a heat dissipation pipe 7 is provided in the middle position of the mounting shell, an anti-convection insulation ring 11 is further provided in the mounting shell, the anti-convection insulation ring 11 and the heat dissipation pipe 7 are processed as one piece, the impedance matching cone includes an intermediate cylindrical structure, and the upper and lower ends of the intermediate cylindrical structure are provided with a conical structure, and the diameter of the conical structure is smaller than the diameter of the cylindrical structure. The three-dimensional schematic diagram of the present invention is shown as follows Figure 5 shown.

[0030] In the embodiment of the present invention, multiple sections of waveguide tubes can be provided as needed, and each waveguide tube is connected by an impedance matching cone, such as Figure 2 The figure shows a structure using three waveguide sections, with a first impedance matching cone 5 provided between the first waveguide 1 and the second waveguide 2, and a second impedance matching cone 8 provided between the second waveguide 2 and the third waveguide 3. The first waveguide 1 is fixed to the antenna body PCB board of the electronic unit 13 with bolts 4. The fixing structure is not limited to bolt fixing, thread fixing, or welding connection structure. Since the signal transmission inner hole requires a consistent radius and concentric center, the first waveguide 1, the second waveguide 2, and the third waveguide 3 are connected together to realize TE mode and TM mode signal transmission. Multiple waveguides are connected to form a signal transmission inner tube.

[0031] In the present invention, an impedance matching cone is placed at the transition joint of the waveguide to prevent the convection heat transfer effect of the internal through hole and to insulate the process temperature. At the same time, the impedance matching reduces the electromagnetic wave transmission loss and reflection effect. The waveguides are threaded together, and the waveguides are pressed together with the impedance matching cone. The impedance matching cone can be made of ceramic, glass, and other materials suitable for microwave transmission media, such as Figure 3-4 As shown, the sizes of impedance matching cones made of different materials are different, and different materials can be selected to make them. Figure 3 Impedance matching cone made of alumina ceramics. Figure 4 Impedance matching cone made of zirconia ceramic.

[0032] In this embodiment of the present invention, an anti-convection insulation ring 11 is placed between the two matching ceramic cones. This ring is annular and blocks heat convection. It is integrally machined with the heat pipe 7. The heat pipe 7 utilizes a serrated structure for effective heat dissipation. In this embodiment, the main body is machined to increase the surface heat dissipation area. If two waveguide sections are used, an impedance matching cone is used to connect the two sections. This anti-convection insulation ring is also required. This ring is integrally machined with the heat pipe 7.

[0033] In an embodiment of the present invention, antenna unit 12 is a lens-horn antenna, comprising a lens 9 and a horn. A third waveguide 3 connects to the lens-horn antenna and is press-fitted to lens 9 via a sealing fixture 10, which is threadedly connected to the horn body. A metal horn body 14 is used, threaded or welded to the mounting housing. Since high-temperature antenna applications require direct contact with high-temperature processes, the material required for this area must be heat-resistant. The lens is constructed from ceramic, glass, or a high-temperature microwave transmission dielectric. The connection between the horn antenna and the lens requires direct contact with high-pressure processes. These combined high-temperature and high-pressure process conditions require a heat-resistant sealing material. Materials such as graphite, graphite wound gaskets, asbestos, and polytetrafluoroethylene (PTFE) can be used. In practical applications, this high-temperature and high-pressure resistant structure may face corrosion-resistant process conditions. For these conditions, flange connections or sanitary connections are permitted. This can be achieved by extending the lens edge or combining the lens and a corrosion-resistant veneer.

[0034] In the present invention, the antenna body and the signal transmission inner tube can be assembled by separate processing or integrated processing. The present invention adopts a split processing assembly structure.

[0035] When using a split processing method, there is an air space between the signal transmission inner tube (the second waveguide tube in this embodiment) and the outer tube (heat dissipation tube). This space has the problem of air convection heat transfer. To address this problem, the present invention adopts an anti-convection insulation ring to avoid air heat transfer between the upper and lower parts of the space, thereby preventing thermal damage to electronic components.

[0036] The present invention enables the radar level meter to work at a high temperature of 500°C and a high pressure of 42 MPa. The simulation was carried out using Ansys Workbench, and the results are as follows: Figure 6 , it can be seen that the device reduces the temperature from 500°C to 56.996°C.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high temperature resistant radar level meter, characterized by: It includes a mounting shell, an electronic unit is provided at one end of the mounting shell, an antenna unit is provided at the other end of the mounting shell, at least two waveguide tubes are provided in the mounting shell, an impedance matching cone is provided between the waveguide tubes, an inner tube is provided at the waveguide tube connection, the waveguide tube connection and the impedance matching cone are wrapped by the inner tube, one waveguide tube is connected to the antenna unit, and the other waveguide tube is connected to the electronic unit, a heat dissipation pipe is provided in the middle position of the mounting shell, an anti-convection insulation ring is also provided in the mounting shell, the anti-convection insulation ring and the heat dissipation pipe are processed as one piece, the impedance matching cone includes an intermediate cylindrical structure, and the upper and lower ends of the intermediate cylindrical structure are provided with a conical structure, and the diameter of the conical structure is smaller than the diameter of the cylindrical structure.

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

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

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

5. The high temperature resistant radar level meter according to claim 1, characterized in that: Impedance matching cones are provided between the plurality of waveguide tubes.

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

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

Images