CN112787075A

CN112787075A - High-frequency radar level meter

Info

Publication number: CN112787075A
Application number: CN202110179402.2A
Authority: CN
Inventors: 呼秀山; 夏阳
Original assignee: Beijing Ruida Instrument Co ltd
Current assignee: Beijing Ruida Instrument Co ltd
Priority date: 2021-02-09
Filing date: 2021-02-09
Publication date: 2021-05-11

Abstract

The present disclosure provides a high frequency radar level gauge comprising: the radar level gauge body is used for emitting electromagnetic waves outwards and receiving echoes of the electromagnetic waves so as to realize position detection of materials; the round tubular extension antenna is arranged on the radar level gauge body, and enables electromagnetic waves emitted by the radar level gauge to be emitted outwards through the round tubular extension antenna, and echoes of the electromagnetic waves are received by the radar level gauge body after passing through the round tubular extension antenna; when the high-frequency radar level gauge is installed in a container to realize position detection of materials in the container, at least one part of the circular tube-shaped extension antenna is located in the container, and one end of the circular tube-shaped extension antenna located in the container keeps a preset distance from the surface of the materials.

Description

High-frequency radar level meter

Technical Field

The present disclosure relates to material measuring devices, and more particularly to a high frequency radar level gauge.

Background

Existing 24ghz, 60ghz or 80ghz radar level gauges typically comprise an anti-corrosion antenna to improve the service life of the radar level gauge.

However, the anti-corrosion antenna is generally a structure of an anti-corrosion lens or a structure of a horn plus an anti-corrosion cover. The structure can cause interference at the near end when the stand pipe is too high, so that the blind area of the radar level gauge is increased, and the using effect is poor.

Disclosure of Invention

In order to solve one of the above technical problems, the present disclosure provides a high frequency radar level gauge.

According to an aspect of the present disclosure, there is provided a high frequency radar level gauge comprising:

the radar level gauge body is used for emitting electromagnetic waves outwards and receiving echoes of the electromagnetic waves so as to realize position detection of materials; and

the circular tube-shaped extension antenna is arranged on the radar level gauge body, and enables electromagnetic waves emitted by the radar level gauge to be emitted outwards through the circular tube-shaped extension antenna, and echoes of the electromagnetic waves are received by the radar level gauge body after passing through the circular tube-shaped extension antenna;

when the high-frequency radar level gauge is installed in a container to realize position detection of materials in the container, at least one part of the circular tube-shaped extension antenna is located in the container, and one end of the circular tube-shaped extension antenna located in the container keeps a preset distance from the surface of the materials.

According to a high frequency radar level gauge of at least one embodiment of the present disclosure, a lower end of the circular tubular extension antenna is formed as a chamfered cut.

According to at least one embodiment of the present disclosure, the high frequency radar level gauge, an angle between a plane in which the bevel cuts are located and a horizontal plane is 30-60 °.

The high frequency radar level gauge according to at least one embodiment of the present disclosure, further comprises:

the horn structure, the less one end of diameter of horn structure is fixed in pipe form extension antenna, the great one end of diameter of horn structure keeps the distance of predetermineeing with the surface of material.

According to the high frequency radar level gauge of at least one embodiment of the present disclosure, an inner diameter of the end of the horn structure having the smaller diameter is the same as an inner diameter of the circular tubular extension antenna.

According to the high-frequency radar level gauge of at least one embodiment of the present disclosure, the material of the circular tube-shaped extension antenna is an anti-corrosive plastic.

According to a high frequency radar level gauge of at least one embodiment of the present disclosure, the corrosion resistant plastic is selected from at least one of a polypropylene plastic, a polytetrafluoroethylene plastic, a polyvinylidene fluoride plastic and a PFA plastic.

According to the high frequency radar level gauge of at least one embodiment of the present disclosure, a material layer for blocking electromagnetic wave propagation is provided at an inner wall surface of the circular tube-shaped extension antenna.

According to the high frequency radar level gauge of at least one embodiment of the present disclosure, the material layer for blocking propagation of electromagnetic waves is a graphite layer or a metal powder layer.

According to the high-frequency radar level gauge of at least one embodiment of the present disclosure, the material of the circular tube-shaped extension antenna is a metal material, and an anti-corrosive material layer is disposed outside the metal material.

According to the high frequency radar level gauge of at least one embodiment of the present disclosure, the metallic material is stainless steel; and/or the anti-corrosion material layer is a polytetrafluoroethylene plastic layer.

The high frequency radar level gauge according to at least one embodiment of the present disclosure, said radar level gauge body comprising:

a fixing member on which a process screw is formed, one end of the process screw being located at a lower side of a flange when the flange is mounted on the process screw;

an internal thread is formed at one end of the circular tube-shaped extension antenna, and the circular tube-shaped extension antenna is fixed to the fixing member in a manner that the internal thread of the circular tube-shaped extension antenna is in threaded fit with a process thread located on the lower side of the flange.

According to the high frequency radar level gauge of at least one embodiment of the present disclosure, a sealing structure is formed between one end of the circular tubular extension antenna and the flange.

According to the high-frequency radar level gauge of at least one embodiment of the present disclosure, a first annular groove is formed at an end of the circular tubular extension antenna contacting the flange, and a sealing member is disposed in the first annular groove such that a sealing structure is formed between the end of the circular tubular extension antenna and the flange.

a plastic lens antenna on which an external thread is formed;

an internal thread is formed at one end of the circular tube-shaped extension antenna, and the circular tube-shaped extension antenna is fixed on the plastic lens antenna in a mode that the internal thread of the circular tube-shaped extension antenna is matched with the external thread of the plastic lens antenna.

a fixing member to fix the radar level gauge body to the tank by the fixing member;

wherein one end of the circular tube-shaped extension antenna is in contact with the fixing member, and a sealing structure is formed between the one end of the circular tube-shaped extension antenna and the fixing member.

According to the high frequency radar level gauge of at least one embodiment of the present disclosure, a first annular groove is formed at an end of the circular tube-shaped extension antenna contacting the fixed part, and a sealing member is disposed in the first annular groove such that a sealing structure is formed between the end of the circular tube-shaped extension antenna and the fixed part.

According to the high-frequency radar level gauge of at least one embodiment of the present disclosure, the radar level gauge body is connected with the circular tube-shaped extension antenna through a rotary clamping groove structure.

According to at least one embodiment of the present disclosure, the radar level gauge body comprises a plastic lens antenna, the axis of which is parallel or coincident with the axis of the circular tubular extension antenna.

According to at least one embodiment of the present disclosure, the high frequency radar level gauge comprises a radar level gauge body emitting electromagnetic waves having a frequency of 60GHz or higher.

According to a high frequency radar level gauge of at least one embodiment of the present disclosure, said circular tubular extension antenna has a different wall thickness.

According to at least one embodiment of the present disclosure, the wall thickness of the end of the circular tubular extension antenna proximal to the radar level gauge body is larger than the wall thickness of the end distal to the radar level gauge body.

According to at least one embodiment of the present disclosure, a wall thickness of an end of the circular tubular extension antenna remote from the radar level gauge body is less than or equal to 1 mm.

According to at least one embodiment of the present disclosure, the high frequency radar level gauge, the end of the circular tubular extension antenna remote from the radar level gauge body is closed by a filling structure.

a support structure fixed to a lower end of the circular tube-shaped extension antenna;

wherein the filling structure is disposed on the support structure such that one end of the filling structure is located inside the circular tube-shaped extension antenna.

According to the high frequency radar level gauge of at least one embodiment of the present disclosure, an annular step portion is formed at one end of the support structure, a lower end of the circular tube-shaped extension antenna is disposed at the annular step portion, and the circular tube-shaped extension antenna is fixed to the support structure by a pressing plate.

According to the high-frequency radar level gauge of at least one embodiment of the present disclosure, a clamping groove is formed on an inner wall surface of the supporting structure, a buckle is formed on the filling structure, and the filling structure is fixed to the supporting structure through the cooperation of the buckle and the clamping groove.

According to the high-frequency radar level gauge of at least one embodiment of the present disclosure, a buckle is formed on an inner wall surface of the supporting structure, a clamping groove is formed on the filling structure, and the filling structure is fixed to the supporting structure through the cooperation of the buckle and the clamping groove.

According to the high frequency radar level gauge of at least one embodiment of the present disclosure, a sealing structure is formed between the filling structure and the support structure.

According to the high frequency radar level gauge of at least one embodiment of the present disclosure, the filling structure is formed with a second annular groove in which a sealing member is arranged such that a sealing structure is formed between the filling structure and a support structure.

According to the high frequency radar level gauge of at least one embodiment of the present disclosure, a portion of the filling structure located inside the circular tubular extension antenna is tapered, and/or a portion of the filling structure located outside the circular tubular extension antenna is inverted tapered.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the disclosure and together with the description serve to explain the principles of the disclosure.

FIG. 1 is a schematic view of a prior art radar level gauge.

FIG. 2 is a schematic structural view of a high frequency radar level gauge according to an embodiment of the present disclosure.

FIG. 3 is a schematic structural view of a high frequency radar level gauge according to another embodiment of the present disclosure.

Fig. 4 to 6 are structural schematic views of a circular tube-shaped extended antenna according to one embodiment of the present disclosure.

Fig. 7 is a schematic structural view of a fixing member and a plastic lens antenna according to one embodiment of the present disclosure.

Fig. 8 is a structural schematic diagram of a sealing structure of a circular tube-shaped extension antenna according to an embodiment of the present disclosure.

Fig. 9 is a schematic structural view of a filling device according to an embodiment of the present disclosure.

FIG. 10 is a schematic view of an installation state structure of a high frequency radar level gauge according to an embodiment of the present disclosure.

The reference numbers in the figures are in particular:

100 high frequency radar level gauge

110 radar level gauge body

111 fixing part

112 plastic lens antenna

120 round tube-shaped extension antenna

121 first annular groove

122 sealing member

130 horn structure

140 filling structure

141 fastener

150 support structure

151 step part

152 card slot

160 pressing plate

200 containers.

Detailed Description

The present disclosure will be described in further detail with reference to the drawings and embodiments. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limitations of the present disclosure. It should be further noted that, for the convenience of description, only the portions relevant to the present disclosure are shown in the drawings.

It should be noted that the embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict. Technical solutions of the present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Unless otherwise indicated, the illustrated exemplary embodiments/examples are to be understood as providing exemplary features of various details of some ways in which the technical concepts of the present disclosure may be practiced. Accordingly, unless otherwise indicated, features of the various embodiments may be additionally combined, separated, interchanged, and/or rearranged without departing from the technical concept of the present disclosure.

The use of cross-hatching and/or shading in the drawings is generally used to clarify the boundaries between adjacent components. As such, unless otherwise noted, the presence or absence of cross-hatching or shading does not convey or indicate any preference or requirement for a particular material, material property, size, proportion, commonality between the illustrated components and/or any other characteristic, attribute, property, etc., of a component. Further, in the drawings, the size and relative sizes of components may be exaggerated for clarity and/or descriptive purposes. While example embodiments may be practiced differently, the specific process sequence may be performed in a different order than that described. For example, two processes described consecutively may be performed substantially simultaneously or in reverse order to that described. In addition, like reference numerals denote like parts.

When an element is referred to as being "on" or "on," "connected to" or "coupled to" another element, it can be directly on, connected or coupled to the other element or intervening elements may be present. However, when an element is referred to as being "directly on," "directly connected to" or "directly coupled to" another element, there are no intervening elements present. For purposes of this disclosure, the term "connected" may refer to physically, electrically, etc., and may or may not have intermediate components.

For descriptive purposes, the present disclosure may use spatially relative terms such as "below … …," below … …, "" below … …, "" below, "" above … …, "" above, "" … …, "" higher, "and" side (e.g., as in "side wall") to describe one component's relationship to another (other) component as illustrated in the figures. Spatially relative terms are intended to encompass different orientations of the device in use, operation, and/or manufacture in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below … …" can encompass both an orientation of "above" and "below". Further, the devices may be otherwise positioned (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

The terminology used herein is for the purpose of describing particular embodiments and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Furthermore, when the terms "comprises" and/or "comprising" and variations thereof are used in this specification, the presence of stated features, integers, steps, operations, elements, components and/or groups thereof are stated but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and/or groups thereof. It is also noted that, as used herein, the terms "substantially," "about," and other similar terms are used as approximate terms and not as degree terms, and as such, are used to interpret inherent deviations in measured values, calculated values, and/or provided values that would be recognized by one of ordinary skill in the art.

FIG. 2 is a schematic structural diagram of a high frequency radar level gauge 100 according to an embodiment of the present disclosure.

A high frequency radar level gauge 100 as shown in FIG. 2, comprising:

the radar level gauge comprises a radar level gauge body 110, wherein the radar level gauge body 110 is used for emitting electromagnetic waves outwards and receiving echoes of the electromagnetic waves so as to realize position detection of materials; and

a circular tube-shaped extension antenna 120, wherein the circular tube-shaped extension antenna 120 is disposed on the radar level gauge body 110, and enables electromagnetic waves emitted by the radar level gauge to be emitted outwards through the circular tube-shaped extension antenna 120, and echoes of the electromagnetic waves are received by the radar level gauge body 110 after passing through the circular tube-shaped extension antenna 120;

wherein, when the high frequency radar level gauge 100 is mounted to the container 200 to achieve position detection of the material in the container 200, at least a portion of the circular tube-shaped extension antenna 120 is located in the container 200, and one end of the circular tube-shaped extension antenna 120 located in the container 200 maintains a preset distance from the surface of the material.

Therefore, the high-frequency radar level gauge 100 of the present disclosure may not only reduce the near-end blind area caused by the vertical tube, but also greatly reduce the accumulation of impurities such as condensed water and dust on the original antenna by designing a structure on the radar level gauge body 110 and by using the structure, the circular tube-shaped extension antenna 120 may be fixed to the radar level gauge body 110.

In the present disclosure, the container 200 may be a reaction tank, a reaction kettle, or other chemical equipment, or a device in which materials flow.

Of course, when the high frequency radar level gauge 100 of the present disclosure is in use, the circular tubular extension antenna 120 may be completely entered into the interior of the tank.

FIG. 3 is a schematic structural view of a high frequency radar level gauge according to another embodiment of the present disclosure. Fig. 4 to 6 are structural schematic views of a circular tube-shaped extended antenna according to one embodiment of the present disclosure.

As a preferable mode, referring to fig. 5, the lower end of the circular tube-shaped extension antenna 120 is formed as a chamfered notch; more preferably, the angle between the plane of the said chamfer and the horizontal is 30-60 °.

In an alternative embodiment of the present disclosure, referring to FIGS. 3 and 6, the high frequency radar level gauge 100 further comprises:

the horn structure 130, the one end that the diameter of horn structure 130 is less is fixed in the pipe form extension antenna 120, the one end that the diameter of horn structure 130 is great keeps the preset distance with the surface of material.

In the present disclosure, it is preferable that an inner diameter of the end of the horn structure 130 having a smaller diameter is the same as that of the circular tube-shaped extension antenna 120.

In an optional embodiment of the present disclosure, the material of the circular tube-shaped extension antenna 120 is an anti-corrosion plastic, so that the circular tube-shaped extension antenna has anti-corrosion capability, and the durability of the circular tube-shaped extension antenna 120 is improved.

For example, the corrosion-resistant plastic is selected from at least one of polypropylene plastic, polytetrafluoroethylene plastic, polyvinylidene fluoride plastic, and PFA plastic.

In order to prevent the electromagnetic waves emitted by the radar level gauge body 110 from diverging outwards through the tube wall of the circular tube-shaped extension antenna 120, in the present disclosure, a material layer for blocking the propagation of the electromagnetic waves is disposed on the inner wall surface of the circular tube-shaped extension antenna 120.

Preferably, the material layer for blocking the propagation of the electromagnetic wave is a graphite layer or a metal powder layer.

As another implementation form, the circular tube-shaped extension antenna 120 is made of a metal material, and an anti-corrosion material layer is disposed outside the metal material, so that the circular tube-shaped extension antenna 120 has good anti-corrosion performance.

Preferably, the metal material is stainless steel; and/or the anti-corrosion material layer is a polytetrafluoroethylene plastic layer and can be formed on the base body made of the metal material through a spraying process.

In the present disclosure, with reference to FIG. 7, the radar level gauge body 110 comprises:

a fixing part 111 on which a process screw is formed, one end of which is located at a lower side of a flange when the flange is mounted on the process screw; wherein, referring to fig. 10, the flange may be disposed at a tank opening of a vessel such as a reaction kettle or a reaction tank.

An internal thread is formed at one end of the circular tube-shaped extension antenna 120, and the circular tube-shaped extension antenna 120 is fixed to the fixing member 111 by means of the internal thread of the circular tube-shaped extension antenna 120 being screw-fitted to the process thread located at the lower side of the flange.

In the present disclosure, referring to fig. 8, a sealing structure is formed between one end of the circular tube-shaped extension antenna 120 and the flange.

In one implementation form, a first annular groove 121 is formed at one end of the circular tube-shaped extension antenna 120, which is in contact with the flange, and a sealing member 122 is disposed in the first annular groove 121, so that a sealing structure is formed between one end of the circular tube-shaped extension antenna 120 and the flange.

Preferably, the sealing member 122 may be an O-ring.

As another way of mounting the circular tube shaped extension antenna 120, the radar level gauge body 110 comprises:

a plastic lens antenna 112 having an external thread formed on the plastic lens antenna 112;

an internal thread is formed at one end of the circular tube-shaped extension antenna 120, and the circular tube-shaped extension antenna 120 is fixed to the plastic lens antenna 112 by means of the matching of the internal thread of the circular tube-shaped extension antenna 120 and the external thread of the plastic lens antenna 112.

In this case, the radar level gauge body 110 comprises:

a fixing member 111 to fix the radar level gauge body 110 to the tank 200 by the fixing member 111;

wherein one end of the circular tube-shaped extension antenna 120 is in contact with the fixing member 111, and a sealing structure is formed between the one end of the circular tube-shaped extension antenna 120 and the fixing member 111.

At this time, a first annular groove 121 is formed at one end of the circular tube-shaped extension antenna 120 contacting the fixing part 111, and a sealing member 122 is disposed in the first annular groove 121, so that a sealing structure is formed between the one end of the circular tube-shaped extension antenna 120 and the fixing part 111.

As another connection mode, the radar level gauge body 110 and the circular tube-shaped extension antenna 120 are structurally connected through a rotary slot 152.

In an alternative embodiment of the present disclosure, the radar level gauge body 110 comprises a plastic lens antenna 112, and the axis of the plastic lens antenna 112 is parallel to or coincides with the axis of the circular tubular extension antenna 120.

In the present disclosure, the frequency of the electromagnetic wave emitted by the radar level gauge body 110 is 60GHz or higher, for example, the frequency of the electromagnetic wave may be 60GHz, 80GHz, or the like.

In an alternative embodiment of the present disclosure, the wall thickness of the circular tube-shaped extension antenna 120 is not the same, i.e., the wall thickness of the circular tube-shaped extension antenna 120 is not uniform.

Preferably, the wall thickness of the end of the circular tubular extension antenna 120 proximal to the radar level gauge body 110 is larger than the wall thickness of the end distal to the radar level gauge body 110.

Thus, on the one hand, when the circular tube-shaped extension antenna 120 needs to be cut on site so that the length of the circular tube-shaped extension antenna 120 meets the requirement, the cutting can be facilitated, and the cost is saved.

In one implementation, the wall thickness of the end of the circular tube-shaped extension antenna 120 away from the radar level gauge body 110 is less than or equal to 1 mm.

In an alternative embodiment of the present disclosure, referring to FIG. 9, the end of the circular tubular extension antenna 120 remote from the radar level gauge body 110 is closed by a filling structure 140.

In the present disclosure, the high frequency radar level gauge 100 further comprises:

a support structure 150, wherein the support structure 150 is fixed to the lower end of the circular tube-shaped extension antenna 120;

wherein the filling structure 140 is disposed on the supporting structure 150, and one end of the filling structure 140 is located inside the circular tube-shaped extension antenna 120.

An annular step 151 is formed at one end of the support structure 150, the lower end of the circular tube-shaped extension antenna 120 is disposed at the annular step 151, and the circular tube-shaped extension antenna 120 is fixed to the support structure 150 by a pressing plate 160.

In the present disclosure, a fastening groove 152 is formed on an inner wall surface of the supporting structure 150, a fastening 141 is formed on the filling structure 140, and the filling structure 140 is fixed to the supporting structure 150 by the cooperation of the fastening 141 and the fastening groove 152.

As another implementation form (not shown in the drawings), the inner wall surface of the supporting structure 150 is formed with a buckle, the filling structure is formed with a clamping groove, and the filling structure 140 is fixed to the supporting structure 150 through the cooperation of the buckle and the clamping groove.

In an alternative embodiment of the present disclosure, a sealing structure is formed between the filling structure 140 and the supporting structure 150, for example, the filling structure 140 is formed with a second annular groove 141, and a sealing member is disposed in the second annular groove 141, so that a sealing structure is formed between the filling structure 140 and the supporting structure 150.

Preferably, the portion of the filling structure 140 located inside the circular tube-shaped extension antenna 120 is tapered, and/or the portion of the filling structure 140 located outside the circular tube-shaped extension antenna 120 is reverse tapered.

In the description herein, reference to the description of the terms "one embodiment/mode," "some embodiments/modes," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/mode or example is included in at least one embodiment/mode or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to be the same embodiment/mode or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/aspects or examples and features of the various embodiments/aspects or examples described in this specification can be combined and combined by one skilled in the art without conflicting therewith.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

It will be understood by those skilled in the art that the foregoing embodiments are merely for clarity of illustration of the disclosure and are not intended to limit the scope of the disclosure. Other variations or modifications may occur to those skilled in the art, based on the foregoing disclosure, and are still within the scope of the present disclosure.

Claims

1. A high frequency radar level gauge, comprising:

2. The high frequency radar level gauge according to claim 1, wherein the lower end of said circular tubular extension antenna is formed as a chamfered cut;

and/or the included angle between the plane where the inclined notch is located and the horizontal plane is 30-60 degrees;

and/or, further comprising: the end, with the smaller diameter, of the horn structure is fixed to the circular tube-shaped extension antenna, and a preset distance is kept between the end, with the larger diameter, of the horn structure and the surface of the material;

and/or the inner diameter of the end with the smaller diameter of the horn structure is the same as that of the round tubular extension antenna.

3. The high frequency radar level gauge according to claim 1, wherein said circular tube-like elongated antenna is made of an anti-corrosive plastic;

and/or the anti-corrosion plastic is selected from at least one of polypropylene plastic, polytetrafluoroethylene plastic, polyvinylidene fluoride plastic and PFA plastic;

and/or a material layer for blocking the transmission of electromagnetic waves is arranged on the inner wall surface of the round tubular extension antenna;

and/or the material layer for blocking the transmission of the electromagnetic waves is a graphite layer or a metal powder layer;

and/or the round tubular extension antenna is made of a metal material, and an anti-corrosion material layer is arranged outside the metal material;

and/or, the metal material is stainless steel; and/or the anti-corrosion material layer is a polytetrafluoroethylene plastic layer.

4. The high frequency radar level gauge according to claim 1, wherein said radar level gauge body comprises:

an internal thread is formed at one end of the circular tube-shaped extension antenna, and the circular tube-shaped extension antenna is fixed on the fixing part in a mode that the internal thread of the circular tube-shaped extension antenna is in threaded fit with the process thread positioned on the lower side of the flange;

and/or a sealing structure is formed between one end of the round tubular extension antenna and the flange;

and/or a first annular groove is formed at one end of the circular tubular extension antenna, which is in contact with the flange, and a sealing component is arranged in the first annular groove, so that a sealing structure is formed between one end of the circular tubular extension antenna and the flange.

5. The high frequency radar level gauge according to claim 1, wherein said radar level gauge body comprises:

a plastic lens antenna on which an external thread is formed;

an internal thread is formed at one end of the circular tube-shaped extension antenna, and the circular tube-shaped extension antenna is fixed on the plastic lens antenna in a mode that the internal thread of the circular tube-shaped extension antenna is matched with the external thread of the plastic lens antenna;

and/or, the radar level gauge body comprises:

wherein one end of the circular tube-shaped extension antenna is in contact with the fixing member, and a sealing structure is formed between the one end of the circular tube-shaped extension antenna and the fixing member;

and/or a first annular groove is formed at one end of the round tubular extension antenna, which is in contact with the fixing part, and a sealing component is arranged in the first annular groove, so that a sealing structure is formed between one end of the round tubular extension antenna and the fixing part.

6. The high frequency radar level gauge according to claim 1, wherein said radar level gauge body is connected to said circular tube-like extension antenna by a rotary slot structure;

and/or the radar level gauge body comprises a plastic lens antenna, and the axis line of the plastic lens antenna is parallel to or coincided with the axis line of the round tubular extension antenna;

and/or the frequency of the electromagnetic wave transmitted by the radar level gauge body is above 60 GHz;

and/or the wall thickness of the round tubular extension antenna is different;

and/or the wall thickness of one end, close to the radar level gauge body, of the round tubular extension antenna is larger than that of one end, far away from the radar level gauge body, of the round tubular extension antenna;

and/or the wall thickness of one end, far away from the radar level gauge body, of the round tubular extension antenna is less than or equal to 1 mm.

7. The high frequency radar level gauge according to claim 1, wherein an end of said circular tubular extension antenna remote from the radar level gauge body is closed by a filling structure;

and/or, further comprising:

wherein the filling structure is arranged on the supporting structure, and one end of the filling structure is positioned in the round tubular extension antenna;

and/or one end of the supporting structure is provided with an annular step part, the lower end of the round tubular extension antenna is arranged on the annular step part, and the round tubular extension antenna and the supporting structure are fixed through a pressing plate.

8. The high frequency radar level gauge according to one of the claims 1 to 7, wherein an inner wall surface of said supporting structure is formed with a snap groove, and wherein said filling structure is formed with a snap and is fixed to said supporting structure by cooperation of said snap and said snap groove;

and/or a buckle is formed on the inner wall surface of the supporting structure, a clamping groove is formed on the filling structure, and the filling structure is fixed to the supporting structure through the matching of the buckle and the clamping groove;

and/or a sealing structure is formed between the filling structure and the supporting structure.

9. The high frequency radar level gauge according to claim 8, wherein said filling structure is formed with a second annular groove in which a sealing member is arranged such that a sealing structure is formed between said filling structure and a support structure.

10. The high frequency radar level gauge according to one of the claims 1 to 7, wherein the portion of said filling structure located inside said circular tubular extension antenna is tapered and/or wherein the portion of said filling structure located outside said circular tubular extension antenna is inverted tapered.