Supporting structure

Abstract

The utility model provides a supporting structure which comprises a coaxial tube and a wave guide rod, the wave guide rod is located in the coaxial tube, an insulation gap is reserved between the coaxial tube and the wave guide rod, and a plurality of insulation supporting pieces are further arranged between the coaxial tube and the wave guide rod. A plurality of positioning holes are circumferentially formed in any radial cross section of the coaxial tube, the plurality of positioning holes are in one-to-one correspondence with a plurality of insulating supporting pieces, the aperture of each positioning hole is larger than the diameter of each insulating supporting piece, the insulating supporting pieces are arranged in the corresponding positioning holes, a positioning lantern ring is arranged on the outer wall of the coaxial tube, and the insulating supporting pieces are arranged in the positioning lantern ring. The inner wall of the opening at one end of the positioning lantern ring is provided with a guide inclined plane, and the guide inclined plane is used for extruding all the insulation supporting pieces to abut against the outer wall of the wave guide rod. The wave guide device has the advantages that the positioning lantern ring circumferentially extrudes the insulation supporting pieces arranged in the positioning hole, pressure is applied to the wave guide rod in the circumferential direction at the same time, it is ensured that the wave guide rod is in the middle, and the positioning effect is good; therefore, stable centering of the central wave guide rod under the working condition of large vibration can be guaranteed, and the stability of the overall structure of the coaxial type guided wave radar level meter is guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of radar auxiliary equipment, in particular to a supporting structure. Background Art

[0002] Guided wave radar level meters used for continuous level measurement in the field of industrial automation are generally installed on the top of the tank. Electromagnetic waves are emitted along the waveguide rod. When encountering the measured medium, part of the energy is reflected back. By calculating the time difference between the emission and return of the electromagnetic wave, the distance from the material to the instrument reference plane can be obtained, and then the material height can be calculated based on relevant parameters such as the tank height.

[0003] With the development of industry, there are more and more high-temperature and high-pressure reactors in the thermal power and nuclear power fields, which involves various instruments that can be used in high-temperature and high-pressure working conditions, including guided wave radar level meters. The support between the coaxial waveguide and the central waveguide rod of the coaxial guided wave radar level meter used in this working condition is very critical. It is required to have good insulation properties and must not be damaged in high-temperature and high-pressure working conditions;

[0004] Here, an invention of a support structure for a high-temperature and high-pressure coaxial waveguide radar level meter is proposed. For a coaxial waveguide radar level meter used in high-temperature and high-pressure steam conditions, in order to ensure that the waveguide rod is centered and to prevent insulation between the waveguide rod and the coaxial tube, the support of the center rod must be able to withstand high temperatures and have good insulation. The currently commonly used support structure uses a positioning ring to fix the middle waveguide rod. The outer circle of the positioning ring and the inner wall of the coaxial tube are in contact with each other, so that the middle waveguide rod can achieve the purpose of centering. However, the positioning ring is a relatively thin sheet and has poor toughness. When encountering vibration conditions, it will cause greater stress to the support structure, causing the positioning ring to rupture and fall off. Utility Model Content

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a support structure for solving the technical problem in the prior art that when encountering vibrating working conditions, the support structure will be subjected to greater stress, causing the locating ring to break and fall off.

[0006] In order to achieve the above-mentioned purpose and other related purposes, the utility model provides a support structure, including:

[0007] A coaxial tube and a waveguide rod, wherein the waveguide rod is located in the coaxial tube, and an insulating gap is left between the coaxial tube and the waveguide rod;

[0008] A plurality of insulating support members are further provided between the coaxial tube and the waveguide rod, and a plurality of positioning holes are circumferentially provided on any radial cross section of the coaxial tube, the plurality of positioning holes correspond to the plurality of insulating support members one by one, the aperture of the positioning holes is larger than the diameter of the insulating support members, and the insulating support members are arranged in the corresponding positioning holes;

[0009] A positioning collar is provided on the outer wall of the coaxial tube, and a guiding slope is provided on the inner wall of an opening at one end of the positioning collar. The guiding slope is used to squeeze all the insulating support members tightly against the outer wall of the waveguide rod.

[0010] The advantage of adopting the above technical solution is that the insulating support member arranged in the positioning hole is circumferentially squeezed by the positioning ring, and the waveguide rod is pressurized circumferentially at the same time to ensure that the waveguide rod is centered, thereby ensuring the stable centering of the central waveguide rod 2 under large vibration conditions and ensuring the stability of the overall structure of the coaxial guided wave radar level meter.

[0011] Optionally, the insulating support members are spherical, and all the insulating support members have the same size.

[0012] Optionally, the insulating support member is made of silicon nitride ceramic.

[0013] Optionally, an edge of the positioning collar that is opposite to the guiding slope is fixedly connected to the outer wall of the coaxial tube.

[0014] Optionally, the positioning collar is welded to the outer wall of the coaxial tube.

[0015] Optionally, the coaxial tube and the positioning ring are both made of metal.

[0016] Optionally, the coaxial tube and the positioning ring are both made of stainless steel.

[0017] As described above, a support structure of the utility model has the following beneficial effects: the insulating support member arranged in the positioning hole is circumferentially squeezed by the positioning ring, and the waveguide rod is simultaneously pressed circumferentially to ensure that the waveguide rod is centered, thereby ensuring the stable centering of the central waveguide rod under large vibration conditions and ensuring the stability of the overall structure of the coaxial guided wave radar level meter. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Shown is a schematic diagram of the structure of an embodiment of the utility model;

[0019] Figure 2 Display as Figure 1 A local enlarged schematic diagram in FIG.

[0020] Figure 3 Shown is a partial cross-sectional schematic diagram of a first viewing angle of an embodiment of the utility model;

[0021] Figure 4 It is a partial cross-sectional schematic diagram of a second viewing angle of an embodiment of the utility model;

[0022] Figure 5 It is a partial cross-sectional schematic diagram of a third viewing angle of an embodiment of the present invention.

[0023] Part Number Description

[0024] 1 Coaxial tube

[0025] 2 Probe

[0026] 3 Insulation support

[0027] 4 Locating collar DETAILED DESCRIPTION

[0028] The following is an explanation of the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0029] See also Figure 1 to Figure 2 . It should be noted that the illustrations provided in this embodiment only illustrate the basic concept of the utility model in a schematic manner. The illustrations only show the components related to the utility model rather than being drawn according to the number, shape and size of the components during actual implementation. During implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complex. The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read. They are not used to limit the restrictive conditions for the implementation of the utility model, so they have no technical substantive significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in the utility model without affecting the effects and purposes that can be achieved by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of description and are not used to limit the scope of the implementation of the present utility model. Changes or adjustments to their relative relationships should be regarded as the scope of the implementation of the present utility model without substantially changing the technical content.

[0030] See also Figures 1 to 5 As shown, the utility model provides a support structure, comprising:

[0031] A coaxial tube 1 and a waveguide rod 2, wherein the waveguide rod 2 is located in the coaxial tube 1, and an insulating gap is left between the coaxial tube 1 and the waveguide rod 2;

[0032] A plurality of insulating support members 3 are further provided between the coaxial tube 1 and the waveguide rod 2. A plurality of positioning holes are circumferentially provided on any radial cross section of the coaxial tube 1. The plurality of positioning holes correspond to the plurality of insulating support members 3 one by one. The aperture of the positioning holes is larger than the diameter of the insulating support members 3. The insulating support members 3 are arranged in the corresponding positioning holes.

[0033] A positioning collar 4 is provided on the outer wall of the coaxial tube 1 , and a guiding slope is provided on the inner wall of an opening at one end of the positioning collar 4 . The guiding slope is used to squeeze all the insulating support members 3 against the outer wall of the waveguide rod 2 .

[0034] In one of the embodiments, the aperture of the positioning hole is smaller than the diameter of the insulating support member 3. When a portion of the insulating support member 3 abuts against the corresponding positioning hole, there is an extrusion gap between the insulating support member 3 and the waveguide rod 2. The end surface of the insulating support member 3 extending out of the corresponding positioning hole is extruded by the positioning collar 4 of the coaxial tube 1, so that the extrusion gap between the insulating support member 3 and the waveguide rod 2 does not exist, and the insulating support member 3 is tightly abutted against the outer wall of the waveguide rod 2.

[0035] In this process, for example, the width of the insulating support member 3 is less than or equal to the width of the insulating gap.

[0036] Exemplarily, the insulating support members 3 are spherical, and all the insulating support members 3 have the same size.

[0037] It should also be noted that, in the present application, the insulating support member 3 is spherical, which can effectively avoid stress concentration and will not break even under a large force.

[0038] It is further explained that the size specifications of the insulating support members 3 are the same

[0039] Exemplarily, the insulating support member 3 is made of silicon nitride ceramic.

[0040] It should also be noted that silicon nitride ceramics are used to ensure the insulation between the waveguide probe and the coaxial tube.

[0041] Exemplarily, the edge of the positioning collar 4 facing away from the guiding slope is fixedly connected to the outer wall of the coaxial tube 1 .

[0042] It should also be noted that it is necessary to prevent the guiding inclined surface from being displaced after the insulating support member 3 is squeezed into place, so as to prevent the insulating support member 3 from being loosened and the waveguide rod 2 from being offset.

[0043] Exemplarily, the positioning collar 4 is welded to the outer wall of the coaxial tube 1 .

[0044] Exemplarily, the coaxial tube 1 and the positioning ring 4 are both made of metal.

[0045] It should also be noted that in order to ensure stability after the positioning collar 4 is in place and to ensure good weldability, the coaxial tube 1 and the positioning collar 4 are made of the same metal material.

[0046] Exemplarily, the coaxial tube 1 and the positioning collar 4 are both made of stainless steel.

[0047] In summary, a support structure of the utility model is adopted, and the insulating support member arranged in the positioning hole is circumferentially squeezed by the positioning ring, and the waveguide rod is pressurized circumferentially at the same time to ensure that the waveguide rod is centered. At the same time, the spherical shape of the insulating support member can effectively avoid stress concentration, thereby ensuring the stable centering of the central waveguide rod under large vibration conditions and ensuring the stability of the overall structure of the coaxial guided wave radar level meter.

[0048] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A support structure, characterized in that: include: A coaxial tube (1) and a waveguide rod (2), wherein the waveguide rod (2) is located inside the coaxial tube (1), and an insulating gap is left between the coaxial tube (1) and the waveguide rod (2); A plurality of insulating support members (3) are further provided between the coaxial tube (1) and the waveguide rod (2); a plurality of positioning holes are circumferentially provided on any radial cross section of the coaxial tube (1); the plurality of positioning holes correspond to the plurality of insulating support members (3) in a one-to-one manner; the aperture of the positioning holes is greater than the diameter of the insulating support members (3); and the insulating support members (3) are arranged in the corresponding positioning holes; A positioning collar (4) is provided on the outer wall of the coaxial tube (1), and a guiding slope is provided on the inner wall of an opening at one end of the positioning collar (4), wherein the guiding slope is used to squeeze all the insulating support members (3) and the outer wall of the waveguide rod (2) tightly.

2. A support structure according to claim 1, characterized in that: The insulating support member (3) is spherical, and all the insulating support members (3) have the same size and specification.

3. A support structure according to claim 2, characterized in that: The insulating support member (3) is made of silicon nitride ceramic.

4. A support structure according to claim 3, characterized in that: The positioning collar (4) has an edge at one end facing away from the guiding slope and is fixedly connected to the outer wall of the coaxial tube (1).

5. A supporting structure according to claim 4, characterized in that: The positioning collar (4) is welded to the outer wall of the coaxial tube (1).

6. A supporting structure according to claim 5, characterized in that: The coaxial tube (1) and the positioning collar (4) are both made of metal.

7. A supporting structure according to claim 6, characterized in that: The coaxial tube (1) and the positioning collar (4) are both made of stainless steel.

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