CN111380593B - Radar level meter - Google Patents
Radar level meter Download PDFInfo
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- CN111380593B CN111380593B CN202010317352.5A CN202010317352A CN111380593B CN 111380593 B CN111380593 B CN 111380593B CN 202010317352 A CN202010317352 A CN 202010317352A CN 111380593 B CN111380593 B CN 111380593B
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- Prior art keywords
- antenna
- receiving
- radar level
- level gauge
- microwave
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/284—Electromagnetic waves
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/225—Supports; Mounting means by structural association with other equipment or articles used in level-measurement devices, e.g. for level gauge measurement
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/14—Reflecting surfaces; Equivalent structures
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The application discloses radar level gauge includes: a housing; the receiving and transmitting surface of the antenna component is arranged along any direction within a vertical plus-minus 45-degree range, and the microwave direction for receiving and transmitting the waves by the receiving and transmitting surface is vertical to the receiving and transmitting surface; the reflector plate, antenna module and reflector plate all set up in the shell, and the plane of reflection of reflector plate and the receiving and dispatching face of antenna module set up relatively, and the plane of reflection is used for the microwave vertical reflection to the liquid level of antenna module transmission and reflects the microwave of liquid level reflection to the receiving and dispatching face. The receiving and transmitting surface of the antenna assembly of the radar level meter is arranged along any vertical direction within the range of plus and minus 45 degrees, so that liquid water condensed by vapor evaporated from liquid on the receiving and transmitting surface of the antenna assembly is large in vertical inclination angle of the receiving and transmitting surface, the liquid water can smoothly flow down along the receiving and transmitting surface under the self gravity, and cannot form accumulation on the receiving and transmitting surface, so that the receiving of microwave by the receiving and transmitting surface is not influenced, the microwave receiving intensity is ensured, and the adverse effect of condensed water on liquid level measurement is effectively solved.
Description
Technical Field
The invention relates to the technical field of level meters, in particular to a radar level meter.
Background
Radar level gauges are widely used in modern industrial level gauging as a non-contact measuring tool. The principle of radar level measurement is: the electromagnetic wave is transmitted by the radar level meter antenna, reaches the surface of the measured object, is reflected by the surface of the measured object and then is received by the antenna, and the distance between the transmitting position of the electromagnetic wave and the surface of the measured object can be calculated through the time difference between the transmitting position and the receiving position of the electromagnetic wave, so that the level measurement is realized.
Currently available radar level gauges usually measure liquid with a horizontal liquid level, so the microwaves emitted by the antenna must be emitted vertically downwards. In order to ensure that microwaves can be emitted in a vertically downward direction, the antenna surface of the radar level gauge is typically arranged horizontally. Because the radar level meter is often used for measuring liquids such as water, acid and the like, some measured media have the characteristics of volatilization and condensation, for example, water at high temperature can generate steam, and the surface of an antenna can inevitably generate condensed water. The condensed water generated on the surface of the horizontally arranged antenna is difficult to flow automatically, is often accumulated on the surface of the antenna, and influences the receiving of antenna signals when the water volume is large. The condensed water can absorb the energy of the microwave signal greatly, so that the received microwave signal can be weakened, and sometimes even no signal can be received.
In the existing method, an antenna housing 02 is additionally arranged on an antenna surface 01 of a radar level gauge, as shown in fig. 1, the antenna housing 02 forms an inclined plane, but because the inclined plane cannot have too large angle, the existing angle is always smaller than 45 degrees, the phenomenon of condensed water is still serious, the use effect is not obvious, and the measurement accuracy of the product cannot be effectively improved.
In summary, how to effectively solve the problem that the antenna surface condensed water of the radar level gauge affects the liquid level measurement becomes a problem to be solved urgently by those skilled in the art.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a radar level gauge, so as to effectively solve the adverse effect of the condensed water on the antenna surface of the radar level gauge on the liquid level measurement.
In order to achieve the purpose, the invention provides the following technical scheme:
a radar level gauge, comprising:
a housing;
the antenna assembly is provided with a transceiving surface for transceiving microwaves, the transceiving surface is arranged along any direction within a vertical plus-minus 45-degree range, and the direction of the microwaves transceived by the transceiving surface is perpendicular to the transceiving surface;
the reflector plate is used for vertically reflecting the microwaves emitted by the antenna assembly to a liquid level and reflecting the microwaves reflected by the liquid level to the transmitting and receiving surfaces.
Preferably, in the radar level gauge, the transmitting and receiving surfaces of the antenna assembly are arranged along a vertical direction, and the reflecting surface of the reflecting plate is arranged at an angle of 40-50 degrees with respect to the horizontal plane.
Preferably, in the radar level gauge, the antenna assembly is a transceiver-integrated antenna or a transceiver-split antenna.
Preferably, in the radar level gauge as described above, the antenna assembly is a horn antenna, a lens antenna or a microstrip antenna.
Preferably, in the above radar level gauge, the reflecting surface of the reflecting plate is a flat surface or an arc surface.
Preferably, in the above radar level gauge, further comprising:
the antenna protective cover is arranged in the shell, the antenna protective cover is parallelly covered on the receiving and transmitting surface of the antenna assembly, and microwaves can pass through the antenna protective cover;
the reflecting plate protective cover is arranged in the shell, the reflecting plate protective cover is parallelly covered on the reflecting surface of the reflecting plate, and microwaves can pass through the reflecting plate protective cover.
Preferably, in the above radar level gauge, the antenna shield, the reflection plate shield and the housing are of an integral structure or of a separate assembly structure.
Preferably, in the radar level gauge, the radar level gauge further comprises a microwave convergence cover located below the reflection plate, and the microwave convergence cover is a hollow cylindrical structure or a horn structure with an open bottom; the microwave convergence cover is used for converging and enhancing the passing microwaves.
Preferably, in the radar level gauge, the microwave convergence hood and the housing are of an integral structure or a separate structure.
Preferably, in the radar level gauge described above, an axis of the microwave focus cage passes through a reflection center of the reflection plate.
Preferably, in the above radar level gauge, the housing is a sealing structure, and an outer wall of the housing is provided with a connecting portion and a tool clamping portion, the tool clamping portion being located at an upper end of the connecting portion.
Preferably, in the radar level gauge as described above, the housing is of a cylindrical structure, a polygonal cylinder structure, a horn structure or a profiled structure.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a radar level gauge, which comprises a shell, an antenna assembly and a reflecting plate; the antenna assembly and the reflector plate are arranged in the shell, a receiving and transmitting surface of the antenna assembly is arranged along any direction within a vertical plus-minus 45-degree range, the receiving and transmitting surface is used for receiving and transmitting microwaves, and the direction of the microwaves received and transmitted by the antenna assembly is perpendicular to the receiving and transmitting surface; the reflecting surface of the reflecting plate is opposite to the receiving and transmitting surface of the antenna assembly, and the reflecting surface is used for vertically reflecting the microwaves emitted by the antenna assembly to the liquid surface and reflecting the microwaves reflected by the liquid surface to the receiving and transmitting surface.
When the radar level gauge works, a receiving and transmitting surface of an antenna assembly firstly emits microwaves, the microwaves are transmitted to a reflecting surface of a reflecting plate, the microwaves are transmitted to a horizontal liquid level of liquid below along the vertical direction after being reflected by the reflecting surface, the microwaves are vertically reflected by the horizontal liquid level, the microwaves return to the reflecting surface along the direction opposite to the emitting direction, the microwaves are reflected again by the reflecting surface, finally the microwaves return to the receiving and transmitting surface of the antenna assembly, and the receiving and transmitting surface receives the microwaves. And completing the microwave transmitting and receiving processes of the radar level meter, and detecting the liquid level.
Because in this process, the receiving and dispatching face of antenna module sets up along vertical plus or minus 45 arbitrary direction within range, consequently, the liquid water that the steam after the liquid evaporation condensed at the receiving and dispatching face of antenna module because the vertical inclination of receiving and dispatching face is big, liquid water can flow down along the receiving and dispatching face smoothly under self gravity, can not form at the receiving and dispatching face and gather to can not influence the receiving of receiving and dispatching face to the microwave, guaranteed microwave receiving strength, thereby effectively solved antenna surface comdenstion water and to liquid level measurement's harmful effects.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic view of a prior art radar level gauge;
FIG. 2 is a schematic structural view of a radar level gauge according to an embodiment of the present invention;
FIG. 3 is a schematic structural view of another radar level gauge according to an embodiment of the present invention;
FIG. 4 is a schematic structural view of a third radar level gauge according to an embodiment of the present invention;
FIG. 5 is a schematic view of an appearance structure of a radar level gauge according to an embodiment of the present invention;
FIG. 6 is a schematic structural view of a housing of the radar level gauge according to the present invention;
FIG. 7 is a schematic structural view of another housing of the radar level gauge according to an embodiment of the present invention;
FIG. 8 is a single antenna structure diagram of a microstrip antenna of a radar level gauge according to an embodiment of the present invention;
FIG. 9 is a planar array antenna structure diagram of a microstrip antenna of a radar level gauge according to an embodiment of the present invention.
Wherein 01 is the antenna surface, 02 is the antenna house, 1 is the shell, 11 is connecting portion, 12 is the instrument holder, 2 is the antenna module, 3 is the antenna protection casing, 4 is the microwave convergence cover, 5 is the reflecting plate protection casing, 6 is the reflecting plate.
Detailed Description
The core of the invention is to provide a radar level gauge, which effectively solves the adverse effect of antenna surface condensate water of the radar level gauge on liquid level measurement.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to FIGS. 2-5, an embodiment of the present invention provides a radar level gauge comprising a housing 1, an antenna assembly 2 and a reflector plate 6; wherein, antenna module 2 and reflecting plate 6 are all set up in casing 1, protect antenna module 2 and reflecting plate 6 through casing 1. The antenna component 2 is provided with a receiving and transmitting surface for receiving and transmitting the microwave, the receiving and transmitting surface is arranged along any direction within a vertical plus and minus 45 degrees range, and the receiving and transmitting direction of the microwave of the receiving and transmitting surface is vertical to the receiving and transmitting surface, namely the receiving and transmitting direction of the microwave is transmitted along any direction within a horizontal plus and minus 45 degrees range; the reflecting surface of the reflecting plate 6 is arranged opposite to the receiving and transmitting surface of the antenna assembly 2, and the reflecting surface is used for vertically reflecting the microwaves emitted by the antenna assembly 2 to the liquid surface and reflecting the microwaves reflected by the liquid surface to the receiving and transmitting surface, namely the transmission direction of the microwaves between the reflecting surface and the liquid surface is along the vertical direction, so that the accurate measurement of the horizontal liquid surface is ensured.
When the radar level gauge works, the receiving and transmitting surface of the antenna assembly 2 firstly emits microwaves, the microwaves are transmitted to the reflecting surface of the reflecting plate 6, the microwaves are transmitted to the horizontal liquid level of liquid below along the vertical direction after being reflected by the reflecting surface, the microwaves are vertically reflected by the horizontal liquid level, the microwaves return to the reflecting surface along the direction opposite to the emitting direction, the microwaves are reflected again by the reflecting surface, finally the microwaves return to the receiving and transmitting surface of the antenna assembly 2, and the receiving and transmitting surface receives the microwaves. And completing the microwave transmitting and receiving processes of the radar level meter, and detecting the liquid level.
Because in this process, the receiving and dispatching face of antenna module 2 sets up along any direction of vertical plus or minus 45 within ranges, consequently, the liquid water that the steam after the liquid evaporation condensed at the receiving and dispatching face of antenna module 2 because the vertical inclination of receiving and dispatching face is big, liquid water can flow down along the receiving and dispatching face smoothly under self gravity, can not form at the receiving and dispatching face and gather to can not influence the receiving of receiving and dispatching face to the microwave, guaranteed microwave receiving strength, thereby effectively solved antenna surface comdenstion water and to liquid level measurement's harmful effects.
As shown in fig. 2 to 4, in the present embodiment, the transmitting and receiving surfaces of the antenna assembly 2 are arranged in the vertical direction or in the direction close to the vertical direction, and the reflecting surface of the reflector 6 is arranged at an angle of 40 ° to 50 ° with respect to the horizontal plane, that is, the reflecting surface of the reflector 6 is arranged in the direction of 45 ° or in the direction close to 45 ° with respect to the horizontal plane. So set up, form 45 contained angles or nearly 45 contained angles between the receiving and dispatching face of antenna module 2 and the plane of reflection of reflecting plate 6, and the opening of this contained angle is downward, and the microwave transmission direction that sends antenna module 2 through the plane of reflection of reflecting plate 6 is vertical direction from the horizontal direction conversion, reaches the vertical purpose of launching microwave downwards, and the transmission direction of microwave receiving process is opposite with the transmission direction of microwave emission process. Because the receiving and dispatching face of the antenna component 2 is vertically arranged, the condensed water flows down along the receiving and dispatching face under the action of the self weight, and therefore the adverse effect of the condensed water on the microwave receiving and dispatching face is better solved.
Of course, the receiving and transmitting surface of the antenna assembly 2 may also be arranged along any direction except the vertical direction within the vertical plus or minus 45 degrees, and accordingly, the reflecting surface of the reflecting plate 6 is adjusted by a corresponding angle, so long as the purpose of vertically and downwardly transmitting the transmitted microwave is achieved.
In this embodiment, the antenna assembly 2 is a transceiver antenna or a transceiver antenna, wherein the transceiver antenna is an antenna capable of performing both microwave transmission and microwave reception. And the transmitting and receiving split antenna is provided with a single transmitting antenna and a single receiving antenna. As long as microwave transmission and reception of the antenna assembly 2 can be achieved, an appropriate antenna form is selected according to actual circumstances.
As shown in fig. 3, in the present embodiment, the antenna component 2 is a horn antenna, i.e. the shape of the antenna is similar to a horn structure. Of course, the antenna component 2 may also be a lens antenna, i.e. the antenna is shaped like a lens structure.
As shown in fig. 2, 4, 8 and 9, the antenna assembly 2 may also be a microstrip antenna, which is formed by etching a trace or a structure on a circuit board. The circuit board is composed of a conductive ground layer, a non-conductive middle medium layer and a conductive routing layer. The microstrip antenna can be further divided into a single antenna structure and a planar array antenna structure, as shown in fig. 8 and 9, respectively. Preferably, the antenna assembly 2 adopts a planar array antenna structure, so that the structure of the antenna assembly 2 is a planar structure, the structure is compact, the area of the transmitting and receiving surface is large, and microwave transmission and reception are facilitated. Of course, the antenna assembly 2 is not limited to the kind and form of the antenna exemplified in the present embodiment as long as the transmission and reception of the microwave can be achieved.
Further, in this embodiment, the reflecting surface of the reflecting plate 6 is a plane or an arc surface, wherein the arc surface does not include a paraboloid and an ellipsoid, and the distance between the microwaves reflected to the liquid surface is too short due to the good gathering effect of the paraboloid and the ellipsoid on the microwaves, which is not favorable for measuring the liquid level of the liquid surface.
In the present embodiment, the reflection plate 6 is made of metal or other material capable of reflecting microwaves. The surface of the plastic material may be coated with a metal coating, as long as microwave reflection can be achieved, and the plastic material is not limited to the materials listed in the embodiment.
Furthermore, in the present embodiment, the area of the reflection surface of the reflection plate 6 is greater than or equal to the area of the transmission and reception surface of the antenna assembly 2, so that the microwave signal emitted from the antenna assembly 2 can be totally or partially reflected.
In the present embodiment, the antenna assembly 2 and the reflector plate 6 may be mounted inside the housing 1 by means of a screw structure, gluing, bayonet lock, etc. Or an antenna assembly installation clamping groove and a reflector plate installation clamping groove are arranged in the shell 1, the antenna assembly 2 is inserted into the antenna assembly installation clamping groove, and the reflector plate 6 is inserted into the reflector plate installation clamping groove for fixing. The mounting arrangement of the antenna assembly 2 and the reflector plate 6 in the housing 1 is not particularly limited as long as it can be achieved.
2-4, in the present embodiment, the radar level gauge further comprises an antenna shield 3 and a reflector shield 5; the antenna protection cover 3 is arranged in the shell 1, and the antenna protection cover 3 is parallelly covered on the receiving and transmitting surface of the antenna component 2, namely the setting angle of the antenna protection cover 3 corresponds to the setting angle of the receiving and transmitting surface of the antenna component 2, so that the receiving and transmitting surface can be completely covered, the receiving and transmitting surface can be protected, and microwaves can pass through the antenna protection cover 3 and do not hinder the transmission and the reception of the microwaves; the reflecting plate protective cover 5 is arranged in the shell 1, the reflecting surface of the reflecting plate 6 is arranged on the reflecting plate protective cover 5 in a parallel cover mode, namely the setting angle of the reflecting plate protective cover 5 is corresponding to the setting angle of the reflecting surface of the reflecting plate 6, the reflecting surface can be completely covered, the receiving and transmitting surface is protected, and microwaves can pass through the reflecting plate protective cover 5 and do not interfere with the transmission of the microwaves. The antenna shield 3 and the reflector shield 5 may be made of a material that can transmit microwaves, such as plastic and ceramic. If plastics are selected, the plastics can be PTFE, PP or FEP.
Preferably, in the present embodiment, the antenna protection cover 3 is vertically disposed, the reflection plate protection cover 6 is disposed at an angle of 45 ° or approximately 45 ° with respect to the horizontal plane, and the antenna protection cover 3 and the reflection plate protection cover 5 may be disposed at an angle of 45 ° or approximately 45 °. The two ends of the antenna protective cover 3 and the two ends of the reflecting plate protective cover 5 which form an included angle can be tightly attached to each other and are connected into a whole, so that the sealing protection effect is achieved.
Further, in the present embodiment, the antenna shield 3 and the reflection plate shield 5 may be formed together with the housing 1, and the three may be combined together. This integral structure can be through machining or mould injection moulding direct forming, convenient production, and practice thrift the cost.
Of course, the antenna protection cover 3 and the reflection plate protection cover 5 may be assembled with the housing 1 in a separate manner, and specifically, may be mounted inside the housing 1 in an adhesive manner, a clamping manner, a screw fixing manner, or the like.
The radar level gauge is further optimized, in the embodiment, the radar level gauge further comprises a microwave convergence cover 4 positioned below the reflecting plate 6, and the microwave convergence cover 4 is a hollow cylindrical structure or a horn structure with an open bottom; for concentrating and enhancing the passing microwaves. Specifically, the microwave convergence cover 4 is disposed below the reflector shield 5 and the antenna shield 3, as shown in fig. 2 and 3, the microwave convergence cover 4 is cylindrical, the upper end and the lower end of the microwave convergence cover are open, the emitted microwaves are reflected by the reflector 6 and then enter the microwave convergence cover 4, the microwaves are converged by the inner wall of the microwave convergence cover 4, and the microwaves are reduced from being diffused to the periphery, so that the microwave intensity is maintained, and the measurement accuracy is further improved. As shown in fig. 4, the microwave converging cover 4 is in a horn shape with a small upper end and a large lower end, and the upper end and the lower end are open, so that the converging and reinforcing effects of microwaves can be realized.
Of course, the microwave converging cover 4 may have other structures, and is not limited to the form illustrated in the embodiment.
Further, in the present embodiment, the microwave collecting cover 4 and the housing 1 are of an integral structure or a separate structure. The two are preferably integrated, so that the structure is simplified and the cost is reduced. As shown in fig. 2 and 3, for the cylindrical microwave convergence hood 4, the lower end of the outer shell 1 extends to the lower part of the reflection plate 6 to form the microwave convergence hood 4. As shown in fig. 4, for the horn-shaped microwave convergence hood 4, a horn-shaped structure may be separately and integrally provided inside the lower end of the housing 1. The configuration is not limited to the configuration illustrated in the present embodiment as long as the microwave can be converged. As an optimization, in the present embodiment, the axis of the microwave converging cover 4 passes through the reflection center of the reflection plate 6, so that the microwaves reflected by the reflection plate 6 converge toward the center of the microwave converging cover 4, and the vertical propagation distance of the microwaves is increased.
In this embodiment, the housing 1 is a sealing structure to improve the protection effect of the internal structure. The outer wall of the housing 1 is provided with a connecting portion 11 and a tool holding portion 12, and the tool holding portion 12 is located at an upper end of the connecting portion 11. The radar level gauge as a whole can be detachably mounted to other external devices via the connection portion 11.
Specifically, the connecting portion 11 is a screw thread, and when mounting, a torque is applied to the tool holding portion 12 using a screwing tool, thereby completing the mounting and dismounting. Of course, the connection portion 11 may also be a snap-fit structure, a tight-fit structure, or the like, as long as the connection between the housing 1 and the external device is achieved, and is not limited to the form exemplified in the embodiment.
The outer contour of the housing 1 may be circular or polygonal, and the tool holding portion 12 may have a flat square or hexagonal structure, etc. The housing 1 can be produced by machining or by injection molding.
As shown in fig. 2 to 5, in the present embodiment, the shape of the housing 1 is a cylindrical structure, as shown in fig. 8, the housing 1 is a horn structure, as shown in fig. 6, the housing 1 is a special-shaped structure; the housing 1 may also be a polygonal barrel structure. The present invention is not limited to the structure illustrated in the present embodiment as long as the internal components can be protected.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (12)
1. A radar level gauge, characterized in that it comprises:
a housing (1);
the antenna assembly (2) is provided with a transceiving surface for transceiving microwaves, the transceiving surface is arranged along any direction within a vertical plus-minus 45-degree range, so that liquid water condensed on the transceiving surface can smoothly flow down along the transceiving surface under the self-gravity, and the direction of the microwaves transceived by the transceiving surface is perpendicular to the transceiving surface;
the antenna assembly (2) and the reflector plate (6) are arranged in the shell (1), a reflecting surface of the reflector plate (6) is arranged opposite to a transmitting and receiving surface of the antenna assembly (2), and the reflecting surface is used for vertically reflecting the microwaves emitted by the antenna assembly (2) to a liquid surface and reflecting the microwaves reflected by the liquid surface to the transmitting and receiving surface.
2. The radar level gauge according to claim 1, wherein the transmitting and receiving surfaces of the antenna assembly (2) are arranged in a vertical direction and the reflecting surface of the reflecting plate (6) is arranged at an angle of 40 ° to 50 ° with respect to the horizontal plane.
3. The radar level gauge according to claim 1, wherein said antenna assembly (2) is a transceive integral antenna or a transceive split antenna.
4. The radar level gauge according to claim 1, wherein said antenna assembly (2) is a horn antenna, a lens antenna or a microstrip antenna.
5. The radar level gauge according to claim 1, wherein the reflecting surface of the reflecting plate (6) is planar or curved.
6. The radar level gauge according to claim 1, further comprising:
the antenna protective cover (3) is arranged in the shell (1), the antenna protective cover (3) is parallelly covered on the transmitting and receiving surface of the antenna component (2), and microwaves can pass through the antenna protective cover (3);
a reflector shield (5) disposed in the housing (1), and a reflector shield (5) disposed in parallel to the reflector shield (6) and configured to reflect microwaves through the reflector shield (5).
7. The radar level gauge according to claim 6, wherein said antenna shield (3), said deflector shield (5) and said housing (1) are of a unitary or a split assembly construction.
8. Radar level gauge according to any one of claims 1 to 7, further comprising a microwave focus cage (4) located below the reflection plate (6), the microwave focus cage (4) being of an open-bottomed hollow cylindrical or horn structure; the microwave convergence cover is used for converging and enhancing the passing microwaves.
9. The radar level gauge according to claim 8, wherein said microwave convergence hood (4) is of integral or separate construction from said housing (1).
10. The radar level gauge according to claim 8, wherein the axis of said microwave focus cage (4) passes through the reflection center of said reflection plate (6).
11. The radar level gauge according to claim 1, wherein said housing (1) is a sealing structure, an outer wall of said housing (1) being provided with a connecting portion (11) and a tool holding portion (12), said tool holding portion (12) being located at an upper end of said connecting portion (11).
12. The radar level gauge according to claim 1, wherein said housing is of a cylindrical, polygonal, horn or profiled construction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010317352.5A CN111380593B (en) | 2020-04-21 | 2020-04-21 | Radar level meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010317352.5A CN111380593B (en) | 2020-04-21 | 2020-04-21 | Radar level meter |
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| Publication Number | Publication Date |
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| CN111380593A CN111380593A (en) | 2020-07-07 |
| CN111380593B true CN111380593B (en) | 2021-12-24 |
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| CN202010317352.5A Active CN111380593B (en) | 2020-04-21 | 2020-04-21 | Radar level meter |
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| CN113375758A (en) * | 2021-07-08 | 2021-09-10 | 北京锐达仪表有限公司 | Radar level meter with variable beam angle |
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| CN111380593A (en) | 2020-07-07 |
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