JP2006214609A - Antenna for microwave and microwave level meter - Google Patents

Antenna for microwave and microwave level meter Download PDF

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JP2006214609A
JP2006214609A JP2005025283A JP2005025283A JP2006214609A JP 2006214609 A JP2006214609 A JP 2006214609A JP 2005025283 A JP2005025283 A JP 2005025283A JP 2005025283 A JP2005025283 A JP 2005025283A JP 2006214609 A JP2006214609 A JP 2006214609A
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microwave
antenna
transmitting
transmission
level meter
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JP4823532B2 (en
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Yoshihiko Enami
嘉彦 榎並
Hiroyuki Suzuki
啓之 鈴木
Takeshi Tsutsumi
武司 堤
Hayae Kayano
早衛 萱野
Kenji Kurose
憲二 黒瀬
Koichi Nishida
幸一 西田
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Nippon Steel Corp
Wadeco Co Ltd
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Nippon Steel Corp
Wadeco Co Ltd
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  • Coke Industry (AREA)
  • Blast Furnaces (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
  • Incineration Of Waste (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a microwave level meter capable of suppressing reduction of detection precision due to elongation of a waveguide and a coaxial cable, detecting the amount of deposit of contents having high temperature accurately, and being miniaturized, having a simple thermal insulation and cooling structure, and being advantageous from the viewpoint of facility cost and to provide an antenna for microwave used in the microwave level meter. <P>SOLUTION: This antenna for microwave is constituted by storing an RF transmitting and receiving part composed of only a transmitting and receiving circuit for leading microwave from a microwave oscillator arranged in the outside onto a transmitting and receiving face into a housing by separating it from the transmitting and receiving face, mounting it on a rear face on the opposite side to the transmitting and receiving face, and connecting the RF transmitting and receiving part with the transmitting and receiving face by the shortest coaxial cable or waveguide. This microwave level meter is constituted by mounting the antenna by directing the transmitting and receiving face into the inside of the device and installing a control part for controlling transmission and reception of microwave and calculating amount of deposit of contents based on received microwave and the microwave oscillator in the outside of the device. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、溶鉱炉、コークス炉及び焼却炉等の内容物を高温でする装置に装着され、マイクロ波を装置内部に送信し、内容物による反射マイクロ波を検波して該内容物の堆積量を検知するマイクロ波レベル計、並びに前記マイクロ波レベル計に使用されるマイクロ波用アンテナ（以下、単に「アンテナ」ともいう）に関する。   The present invention is attached to a device that heats the contents at a high temperature, such as a blast furnace, a coke oven, and an incinerator, transmits a microwave to the inside of the device, detects a reflected microwave by the contents, and determines the accumulated amount of the contents The present invention relates to a microwave level meter to be detected, and a microwave antenna (hereinafter also simply referred to as “antenna”) used in the microwave level meter.

溶鉱炉、コークス炉、焼却炉等の炉では、炉内に水蒸気ミストやオイルミストをはじめとして各種浮遊物が存在するため、内容物の堆積量を検出するために、炉内にマイクロ波を送信し、内容物による反射マイクロ波を受信するマイクロ波レベル計が使用されている。   In furnaces such as blast furnaces, coke ovens, and incinerators, various floating substances such as water vapor mist and oil mist exist in the furnace, so microwaves are transmitted to the furnace in order to detect the amount of accumulated contents. Microwave level meters that receive reflected microwaves from the contents are used.

図７は、マイクロ波レベル計を備えた焼却炉を示す概略断面図である。図示されるように、焼却炉３０では、投入されたゴミ等の燃焼物３１が礫床部３２に堆積しており、燃焼物３１の直上には、開口部３３が設けられるとともに、開口部３３には、マイクロ波レベル計４０が取り付けられている。   FIG. 7 is a schematic cross-sectional view showing an incinerator equipped with a microwave level meter. As shown in the figure, in the incinerator 30, burned combustibles 31 such as dust are accumulated on the gravel floor portion 32, and an opening 33 is provided immediately above the combustible 31, and the opening 33. Is equipped with a microwave level meter 40.

マイクロ波レベル計４０は、マイクロ波送信器、マイクロ波受信器及び演算部等を備えたコントロールユニット４１と、コントロールユニット４１から導波管や同軸ケーブル４２を介して接続されるアンテナ４３とから概略構成されている。アンテナ４３は、例えば、金属板を一端の開口部に向かって徐々に拡径するホーン状に加工したものであり、開口部の周縁を焼却炉３０の開口部３３のフランジ３４にボルト締結して焼却炉３０の上部に取り付けられる。   The microwave level meter 40 is roughly composed of a control unit 41 including a microwave transmitter, a microwave receiver, a calculation unit, and the like, and an antenna 43 connected from the control unit 41 via a waveguide or a coaxial cable 42. It is configured. The antenna 43 is formed, for example, by processing a metal plate into a horn shape that gradually increases in diameter toward the opening at one end, and the periphery of the opening is bolted to the flange 34 of the opening 33 of the incinerator 30. It is attached to the upper part of the incinerator 30.

上述したマイクロ波レベル計４０では、マイクロ波送信器からのマイクロ波Ｍが、アンテナ４３を介して燃焼物３１の上面に垂直に入射するように発射されるとともに、燃焼物３１で反射されたマイクロ波Ｍが、アンテナ４３を介してマイクロ波受信器で受信される。そして、受信されたマイクロ波Ｍに基づき、コントロールユニット４１に設けられた演算部にて焼却物３１までの距離が求められ、算出された距離に基づいて焼却物３１の堆積量を推定している（例えば、特許文献１参照）。   In the microwave level meter 40 described above, the microwave M from the microwave transmitter is emitted through the antenna 43 so as to be perpendicularly incident on the upper surface of the combustion product 31 and is reflected by the combustion product 31. The wave M is received by the microwave receiver via the antenna 43. And based on the received microwave M, the distance to the incineration object 31 is calculated | required in the calculating part provided in the control unit 41, and the deposition amount of the incineration object 31 is estimated based on the calculated distance. (For example, refer to Patent Document 1).

特開２００１―１５８８８２号公報JP 2001-158882 A

溶鉱炉、コークス炉、焼却炉等では炉内温度がかなり高くなるため、この熱によるマイクロ波送信器やマイクロ波受信器、演算部の誤作動を防ぐために、アンテナ４３とコントロールユニット４１とをある程度離して配置する必要があり、導波管や同軸ケーブル４２は必然的に長くなる。しかし、マイクロ波レベル計４０では、導波管や同軸ケーブル４２が長くなると、アンテナや同軸ケーブル４２のアンテナ側終端からの不要反射波による受信信号の影響が大きくなり、内容物からの反射マイクロ波を判別するのが難しくなる。また、導波管や同軸ケーブル４２が長くなると、装置の大型化を招き、設置上の不具合も招く。コントロールユニット４１をアンテナ４３の近くに配置することも考えられなくもないが、高度の断熱、冷却構造を必要とし、多大な設備コストを要する。   In the blast furnace, coke oven, incinerator, etc., the temperature in the furnace becomes considerably high. In order to prevent malfunction of the microwave transmitter, the microwave receiver and the calculation unit due to this heat, the antenna 43 and the control unit 41 are separated to some extent. The waveguide and the coaxial cable 42 are necessarily long. However, in the microwave level meter 40, when the waveguide or the coaxial cable 42 becomes longer, the influence of the received signal due to the unnecessary reflected wave from the antenna-side end of the antenna or the coaxial cable 42 increases, and the reflected microwave from the contents is increased. It becomes difficult to discriminate. In addition, if the waveguide and the coaxial cable 42 become long, the apparatus becomes large and a problem in installation is caused. Although it is unthinkable to arrange the control unit 41 in the vicinity of the antenna 43, it requires a high degree of heat insulation and cooling structure, and requires a large equipment cost.

本発明はこのような状況に鑑みてなされたものであり、導波管や同軸ケーブルが長くなることによる検出精度の低下を抑え、高温の内容物の堆積量を正確に検出することか可能で、しかも小型化も同時に図れ、断熱、冷却構造も簡易で設備コストの上でも有利なマイクロ波レベル計、並びに前記マイクロ波レベル計に使用されるアンテナを提供することを目的とする。   The present invention has been made in view of such a situation, and it is possible to suppress a decrease in detection accuracy due to a long waveguide or coaxial cable, and to accurately detect the accumulation amount of high-temperature contents. In addition, it is an object of the present invention to provide a microwave level meter that can be downsized at the same time, has a simple heat insulation and cooling structure, and is advantageous in terms of equipment cost, and an antenna used for the microwave level meter.

上記の目的を達成するために、本発明は以下のアンテナ及びマイクロ波レベル計を提供する。
（１）収容した内容物を高温で処理する装置に装着され、送受信面によりマイクロ波を前記装置内に送信し、前記内容物で反射された反射マイクロ波を受信するアンテナであって、
外部に配設したマイクロ波発振器からのマイクロ波を前記送受信面に導くための送受信回路のみからなるＲＦ送受信部を、前記送受信面から離間させてハウジングに収容して前記送受信面とは反対側の背面に装着し、かつ、前記ＲＦ送受信部と前記送受信面とを最短の同軸ケーブルまたは導波管で連結したことを特徴とするマイクロ波用アンテナ。
（２）前記ＲＦ送受信部が、前記ハウジングの天井面または側面に装着されたヒートシンクにより冷却されることを特徴とする上記（１）記載のマイクロ波用アンテナ。
（３）前記ハウジングと前記背面との間に、通風用の隙間が形成されていることを特徴とする上記（１）または（２）記載のマイクロ波用アンテナ。
（４）カセグレン型であることを特徴とする上記（１）〜（３）の何れか１項に記載のマイクロ波用アンテナ。
（５）収容した内容物を高温で処理する装置に装着され、マイクロ波を炉内に送信し、前記内容物で反射された反射マイクロ波を検波して該内容物の堆積量を検知するレベル計であって、
前記装置の底面と対向して形成された開口部に、上記（１）〜（４）の何れか１項に記載のマイクロ波用アンテナが前記送受信面を装置内部に向けて装着され、かつ、マイクロ波の送受信の制御及び受信したマイクロ波を基に前記内容物の堆積量の算出を行う制御部、並びに前記マイクロ波発振器が装置外に配設されていることを特徴とするマイクロ波レベル計。
（６）前記マイクロ波発振器が、前記ＲＦ送受信部と前記制御部との間に挿入されることを特徴とする上記（５）記載のマイクロ波レベル計。 In order to achieve the above object, the present invention provides the following antenna and microwave level meter.
(1) An antenna that is attached to a device that processes the contained contents at a high temperature, transmits a microwave to the device by a transmission / reception surface, and receives a reflected microwave reflected by the content,
An RF transmission / reception unit consisting only of a transmission / reception circuit for guiding microwaves from a microwave oscillator disposed outside to the transmission / reception surface is separated from the transmission / reception surface and accommodated in a housing, and is opposite to the transmission / reception surface. A microwave antenna, wherein the microwave antenna is mounted on a back surface, and the RF transmitting / receiving unit and the transmitting / receiving surface are connected by a shortest coaxial cable or waveguide.
(2) The microwave antenna according to (1), wherein the RF transceiver is cooled by a heat sink attached to a ceiling surface or a side surface of the housing.
(3) The microwave antenna according to (1) or (2), wherein a gap for ventilation is formed between the housing and the back surface.
(4) The microwave antenna according to any one of (1) to (3) above, which is a Cassegrain type.
(5) A level that is mounted on a device that processes the contained contents at a high temperature, transmits microwaves into the furnace, detects reflected microwaves reflected by the contents, and detects the amount of the accumulated contents. A total of
The microwave antenna according to any one of the above (1) to (4) is mounted in an opening formed facing the bottom surface of the device with the transmitting / receiving surface facing the inside of the device, and A microwave level meter comprising: a control unit for controlling transmission / reception of microwaves and calculating a deposition amount of the contents based on the received microwaves; and the microwave oscillator disposed outside the apparatus. .
(6) The microwave level meter according to (5), wherein the microwave oscillator is inserted between the RF transmitting / receiving unit and the control unit.

本発明のアンテナは、送受信面の背面に、通常１１０℃程度の耐熱性を有する回路構成素子からなるＲＦ送受信部のみを、好ましくは冷却手段を具備した状態で装着したため、優れた耐熱性を有し、更にＲＦ送受信部と送受信面とを最短の同軸ケーブルまたは導波管で接続したことにより、不要反射波によるスペクトル上のノイズも無くなる。従って、このようなアンテナを装着し、熱による影響を受けやすい制御部やマイクロ波発振器を炉外に設置した本発明のマイクロ波レベル計は、高温の炉内の内容物の堆積量を正確に測定することができる。また、アンテナが小型でレベル計全体としての小型化も図られ、更には断熱、冷却構造も簡易で設備コストの上でも有利である。   The antenna according to the present invention has excellent heat resistance because only the RF transmitter / receiver composed of circuit components having heat resistance of usually about 110 ° C. is mounted on the back surface of the transmitter / receiver surface, preferably with a cooling means. Further, since the RF transmitter / receiver and the transmitter / receiver surface are connected with the shortest coaxial cable or waveguide, noise on the spectrum due to unnecessary reflected waves is eliminated. Therefore, the microwave level meter of the present invention, which is equipped with such an antenna and has a control unit and a microwave oscillator that are easily affected by heat installed outside the furnace, accurately determines the amount of accumulated contents in the high-temperature furnace. Can be measured. In addition, the antenna is small and the entire level meter can be miniaturized. Furthermore, the heat insulation and cooling structure are simple and advantageous in terms of equipment cost.

以下、図示される実施形態により本発明を説明する。
図１は、本発明のマイクロ波レベル計１及びアンテナ２の一例を示す概略断面図である。図示されるように、マイクロ波レベル計１のアンテナ２は、炉の内部３０に対して凸となるように、所定の曲率で湾曲した送受信面３を有し、その曲率中心を通る仮想線Ｏ上には、フレーム４の頂部に支持されてマイクロ波の送受信端５が装着されている。マイクロ波はこの送受信端５から発射されてアンテナ装置２の送受信面３で反射された後、炉内に送られ、更に内容物で反射されたマイクロ波はアンテナ２の送受信面３で反射された後、送受信端５に導かれる。このアンテナ２は、フランジ２ａをボルト締結して炉の開口部（図示せず）に取り付けられる。 The present invention will be described below with reference to illustrated embodiments.
FIG. 1 is a schematic sectional view showing an example of a microwave level meter 1 and an antenna 2 of the present invention. As shown in the figure, the antenna 2 of the microwave level meter 1 has a transmission / reception surface 3 curved with a predetermined curvature so as to be convex with respect to the interior 30 of the furnace, and an imaginary line O passing through the center of curvature. The microwave transmission / reception end 5 is mounted on the top of the frame 4 so as to be supported. Microwaves are emitted from the transmission / reception end 5 and reflected by the transmission / reception surface 3 of the antenna device 2 and then sent to the furnace. Further, the microwaves reflected by the contents are reflected by the transmission / reception surface 3 of the antenna 2. Then, it is guided to the transmission / reception end 5. The antenna 2 is attached to an opening (not shown) of the furnace by fastening a flange 2a with a bolt.

また、アンテナ２の送受信面３とは反対側の背面６には、後述される制御部並びにマイクロ波発振器とは分離されて、マイクロ波を送受信端５に導くためのＲＦ送受信部１１が装着される。このＲＦ送受信部１１は、アンテナ２の背面６の何れの場所に装着してもよいが、図示のように、アンテナ２の送受信面３はその周縁に向かって炉側に下降しているため、送受信面３の周縁に近い位置に装着することにより、ＲＦ送受信部１１の突出が少なくなり、小型化を図ることができる。   An RF transmitter / receiver 11 for guiding the microwave to the transmitter / receiver 5 is mounted on the rear surface 6 of the antenna 2 opposite to the transmitter / receiver surface 3, separated from a control unit and a microwave oscillator described later. The The RF transmitter / receiver 11 may be mounted at any location on the back surface 6 of the antenna 2. However, as shown in the figure, the transmitter / receiver surface 3 of the antenna 2 is lowered toward the furnace toward the periphery, By mounting at a position close to the periphery of the transmission / reception surface 3, the protrusion of the RF transmission / reception unit 11 is reduced, and downsizing can be achieved.

ＲＦ送受信部１１の構成は、外部に配設されたマイクロ波発振器から発振されるマイクロ波をアンテナ２の送受信端５に導くことがでれば制限されるものではないが、例えば、図２に示すように、アイソレータ１５と、方向性結合器１６と、サーキュレータ１７と、ミキサ１８とで構成することができる。これら部品は、何れも１１０℃程度までの耐熱性を有しており、溶鉱炉やコークス炉、焼却炉等のレベル計用として使用された場合も、高温に十分に耐え得る。このＲＦ送受信部１１では、外部に配設されたマイクロ波発振器１４から発振される所定の周波数のマイクロ波をアイソレータ１５を経由して方向性結合器１６に送り、方向性結合器１６ではその一部をサーキュレータ１７を経由してアンテナ２の送受信端５に送り、炉の内部３０に向けてマイクロ波Ｍ１を送信し、残りのマイクロ波をミキサ１８に送る。   The configuration of the RF transmission / reception unit 11 is not limited as long as the microwave oscillated from the microwave oscillator disposed outside can be guided to the transmission / reception end 5 of the antenna 2. For example, FIG. As shown, the isolator 15, the directional coupler 16, the circulator 17, and the mixer 18 can be used. These parts all have a heat resistance of up to about 110 ° C., and can sufficiently withstand high temperatures even when used for level meters in blast furnaces, coke ovens, incinerators and the like. The RF transmitter / receiver 11 sends a microwave having a predetermined frequency oscillated from a microwave oscillator 14 disposed outside to the directional coupler 16 via the isolator 15. The part is sent to the transmitting / receiving end 5 of the antenna 2 via the circulator 17, the microwave M <b> 1 is transmitted toward the interior 30 of the furnace, and the remaining microwave is sent to the mixer 18.

ＲＦ送受信部１１を構成するこれら部品は、ハウジング１０のアンテナ２からできるだけ離れた位置、例えば天板１０ａや側板１０ｂに装着した基板１３（ここでは天板１０ａに装着）に搭載される。また、基板１３には、ハウジング１０の外部に突出する冷却手段としてのヒートシンク１２が装着されている。更に、ハウジング１０とアンテナ２の背面６との間には隙間が設けられており、空気Ａを流通させてハウジング１０の内部をより効率的に冷却する。また、空気Ａを強制的にパージすることもできる。   These components constituting the RF transmitting / receiving unit 11 are mounted on a position as far as possible from the antenna 2 of the housing 10, for example, a substrate 13 (mounted on the top plate 10a here) mounted on the top plate 10a or the side plate 10b. A heat sink 12 is mounted on the substrate 13 as a cooling means that protrudes outside the housing 10. Further, a gap is provided between the housing 10 and the back surface 6 of the antenna 2, and the air A is circulated to cool the inside of the housing 10 more efficiently. Further, the air A can be forcibly purged.

また、ＲＦ送受信部１１のサーキュレータ１７は、最短の同軸ケーブル２６によりアンテナ２の送受信端５に接続される。尚、同軸ケーブル２６と送受信端５との接続端面では不要反射を起こすことがあり、ハイパスフィルタ等を付加してもよい。   Further, the circulator 17 of the RF transmission / reception unit 11 is connected to the transmission / reception end 5 of the antenna 2 by the shortest coaxial cable 26. Note that unnecessary reflection may occur at the connection end surface between the coaxial cable 26 and the transmission / reception end 5, and a high-pass filter or the like may be added.

尚、マイクロ波発振器１４は、減衰等を抑えるために、ＲＦ送受信部１１により接近して配設するため、図示のようにＲＦ送受信部１１と後述する制御部２０との間に挿入することが好ましいが、制御部２０に組み込むことも可能である。   The microwave oscillator 14 is disposed closer to the RF transceiver 11 in order to suppress attenuation and the like, so that it can be inserted between the RF transceiver 11 and a control unit 20 described later as shown in the figure. Although it is preferable, it can also be incorporated in the control unit 20.

また、ＲＦ送受信部１１には、内容物で反射されたマイクロ波Ｍ２が入射する。即ち、マイクロ波Ｍ２はアンテナ２の送受信面３で反射されて送受信端５に導かれ、サーキュレータ１７を介してミキサ１８に送られる。そして、ミキサ１８では、送信したマイクロ波Ｍ１と、内容物で反射されたマイクロ波Ｍ２とをミキシングし、ビート信号を制御部２０に送る。   In addition, the microwave M2 reflected by the contents is incident on the RF transmitter / receiver 11. That is, the microwave M 2 is reflected by the transmission / reception surface 3 of the antenna 2, guided to the transmission / reception end 5, and sent to the mixer 18 through the circulator 17. The mixer 18 mixes the transmitted microwave M1 and the microwave M2 reflected by the contents, and sends a beat signal to the control unit 20.

上記ＲＦ送受信部１１は、炉外等に遠隔配置された制御部２０と同軸ケーブルや電線で接続している。制御部２０は、マイクロ波の送受信の制御及び受信したマイクロ波を基に内容物の堆積量の算出を行う機能を有する。制御部２０の構成は、例えば図２に示すように、ＲＦ送受信部１１から送られるミキシング信号を増幅器１９で増幅した後、Ａ／Ｄ変換機２１にてＡ／Ｄ変換した後、ＣＰＵ２２にてビート信号をＦＦＴ処理して内容物までの距離を演算し、内容物の堆積量を表示装置２３に表示する。また、制御部２０はＣＰＵ２２からの信号によりＤ／Ａ変換器２４を介してドライブ回路２５によりマイクロ波発振器１４のマイクロ波の発振を制御（例えば、ＦＭ／ＣＷ方式）する。   The RF transmitter / receiver 11 is connected to the controller 20 remotely located outside the furnace or the like by a coaxial cable or electric wire. The control unit 20 has a function of controlling transmission / reception of microwaves and calculating a deposition amount of contents based on the received microwaves. For example, as shown in FIG. 2, the control unit 20 is configured by amplifying a mixing signal sent from the RF transmission / reception unit 11 with an amplifier 19, A / D converting with an A / D converter 21, and then with a CPU 22. The beat signal is FFT processed to calculate the distance to the contents, and the amount of contents accumulated is displayed on the display device 23. Further, the control unit 20 controls the oscillation of the microwave of the microwave oscillator 14 by the drive circuit 25 via the D / A converter 24 by a signal from the CPU 22 (for example, FM / CW method).

また、図３に示すように、アンテナ２を所謂「カセグレンアンテナ」とし、同様の構成からなるＲＦ送受信部１１と、送受信端５とを導波管２７で接続する構成とすることもできる。尚、導波管２７を最短とするために、ここでは、アンテナ２の曲率中心を通る仮想線上にＲＦ送受信部１１を配置し、基板１３はハウジング１０の天板に到着してある。導波管２７の一端はＲＦ送受信部１１に接続し、他端はアンテナ２から炉の内部３０に所定長にわたり突出しており、その先端部には所定の間隔で反射部材２８が支持部材２９を介して装着されている。反射部材２７は湾曲面を有し、この湾曲面を送受信面３に向けて配置される。従って、ＲＦ送受信部１１から送信されたマイクロ波は、導波管２７を伝搬して先ず反射部材２８で反射され、この反射されたマイクロ波が送受信面３に送られて送受信面３で反射された後、炉３０の内部へと送られる（符号Ｍ１）。そして、内容物で反射されたマイクロ波Ｍ２は、送受信面３で反射されて反射部材２８へと送られた後、反射部材２８で反射されて導波管２８へと導かれ、ＲＦ送受信器１１に送られる。   Further, as shown in FIG. 3, the antenna 2 may be a so-called “Cassegrain antenna”, and the RF transceiver 11 having the same configuration and the transceiver 5 may be connected by a waveguide 27. In order to make the waveguide 27 as short as possible, here, the RF transceiver 11 is arranged on a virtual line passing through the center of curvature of the antenna 2, and the substrate 13 arrives at the top plate of the housing 10. One end of the waveguide 27 is connected to the RF transmitter / receiver 11, and the other end protrudes from the antenna 2 to the interior 30 of the furnace over a predetermined length, and a reflecting member 28 is attached to the tip of the support member 29 at a predetermined interval. Is mounted through. The reflection member 27 has a curved surface, and the curved surface is disposed toward the transmission / reception surface 3. Therefore, the microwave transmitted from the RF transmitter / receiver 11 propagates through the waveguide 27 and is first reflected by the reflecting member 28, and the reflected microwave is sent to the transmitting / receiving surface 3 and reflected by the transmitting / receiving surface 3. After that, it is sent into the furnace 30 (reference numeral M1). Then, the microwave M2 reflected by the contents is reflected by the transmitting / receiving surface 3 and sent to the reflecting member 28, then reflected by the reflecting member 28 and guided to the waveguide 28, and the RF transceiver 11 is reflected. Sent to.

更に、図４に示すようなホーンアンテナ５０に、上記と同様にＲＦ送受信部１１のみを装着し、同軸ケーブル２６で接続する構成とすることもできる。尚、ホーンアンテナ５０では、マイクロ波の送受信端部は、ホーンの根元部分となる。   Furthermore, the horn antenna 50 as shown in FIG. 4 may be configured such that only the RF transmitter / receiver 11 is mounted and connected by the coaxial cable 26 as described above. In the horn antenna 50, the transmission / reception end portion of the microwave is the root portion of the horn.

このように構成される本発明のマイクロ波レベル計１及びアンテナ２は、同軸ケーブル２６や導波管２７を最短にでき、ケーブル長または管長に由来する不要反射波によるビート信号を大幅に低減し、より正確な内容物の堆積量を検知することが可能になる。具体的には、図５にＲＦ送受信部１１、マイクロ波発振器１４及び制御部２０を一体化したユニットをアンテナ２から離して配置したマイクロ波レベル計を用いてコークス炉中の石炭堆積量を測定した結果を示すが、石炭の堆積量を示すビークが他のピークに埋もれて判別不能となっている。これに対して、本発明に従いアンテナ２の背面６にＲＦ送受信部１１を装着し、マイクロ波発振器１４及び制御部２０を炉外に配設したマイクロ波レベル計を用いて測定すると、図６に示すように、石炭の堆積量を示すピークが明確に現われている。   The microwave level meter 1 and the antenna 2 of the present invention configured as described above can make the coaxial cable 26 and the waveguide 27 the shortest, and greatly reduce beat signals due to unnecessary reflected waves derived from the cable length or the tube length. Thus, it becomes possible to detect the amount of accumulated contents more accurately. Specifically, the amount of coal deposited in the coke oven is measured using a microwave level meter in which a unit in which the RF transmitter / receiver 11, the microwave oscillator 14, and the controller 20 are integrated in FIG. The result shows that the beak indicating the amount of coal deposited is buried in another peak and cannot be discriminated. On the other hand, when the RF transmitter / receiver 11 is mounted on the back surface 6 of the antenna 2 according to the present invention and the microwave oscillator 14 and the controller 20 are measured using a microwave level meter arranged outside the furnace, FIG. As shown, a peak indicating the amount of coal deposited appears clearly.

本発明のマイクロ波レベル計及びアンテナの一例を示す断面図である。It is sectional drawing which shows an example of the microwave level meter and antenna of this invention. ＲＦ送受信器及び演算部の構成を示す回路図である。It is a circuit diagram which shows the structure of RF transmitter / receiver and a calculating part. 本発明のマイクロ波レベル計及びアンテナの他の例を示す断面図である。It is sectional drawing which shows the other example of the microwave level meter and antenna of this invention. 本発明のマイクロ波レベル計及びアンテナの他の例を示す断面図である。It is sectional drawing which shows the other example of the microwave level meter and antenna of this invention. 従来のマイクロ波レベル計を用いて石炭の堆積量を測定した結果を示すチャートである。It is a chart which shows the result of having measured the amount of accumulation of coal using the conventional microwave level meter. 本発明のマイクロ波レベル計を用いて石炭の堆積量を測定した結果を示すチャートである。It is a chart which shows the result of having measured the deposit amount of coal using the microwave level meter of the present invention. 従来のマイクロ波レベル計を備えた焼却炉の構成を示す概略断面図である。It is a schematic sectional drawing which shows the structure of the incinerator provided with the conventional microwave level meter.

符号の説明Explanation of symbols

１ マイクロ波レベル計
２ アンテナ
５ 送受信端
１１ ＲＦ送受信部
１２ ヒートシンク
１３ 基板
１４ マイクロ波発振器
２０ 制御部
２６ 同軸ケーブル
２７ 導波管 DESCRIPTION OF SYMBOLS 1 Microwave level meter 2 Antenna 5 Transmission / reception end 11 RF transmission / reception part 12 Heat sink 13 Substrate 14 Microwave oscillator 20 Control part 26 Coaxial cable 27 Waveguide

Claims (6)

収容した内容物を高温で処理する装置に装着され、送受信面によりマイクロ波を前記装置内に送信し、前記内容物で反射された反射マイクロ波を受信するアンテナであって、
外部に配設したマイクロ波発振器からのマイクロ波を前記送受信面に導くための送受信回路のみからなるＲＦ送受信部を、前記送受信面から離間させてハウジングに収容して前記送受信面とは反対側の背面に装着し、かつ、前記ＲＦ送受信部と前記送受信面とを最短の同軸ケーブルまたは導波管で連結したことを特徴とするマイクロ波用アンテナ。 An antenna that is attached to a device that processes the contained contents at a high temperature, transmits a microwave to the device by a transmission / reception surface, and receives a reflected microwave reflected by the content,
An RF transmission / reception unit consisting only of a transmission / reception circuit for guiding microwaves from a microwave oscillator disposed outside to the transmission / reception surface is separated from the transmission / reception surface and accommodated in a housing, and is opposite to the transmission / reception surface. A microwave antenna, wherein the microwave antenna is mounted on a back surface, and the RF transmitting / receiving unit and the transmitting / receiving surface are connected by a shortest coaxial cable or waveguide. 前記ＲＦ送受信部が、前記ハウジングの天井面または側面に装着されたヒートシンクにより冷却されることを特徴とする請求項１記載のマイクロ波用アンテナ。   The microwave antenna according to claim 1, wherein the RF transmitting / receiving unit is cooled by a heat sink attached to a ceiling surface or a side surface of the housing. 前記ハウジングと前記背面との間に、通風用の隙間が形成されていることを特徴とする請求項１または２記載のマイクロ波用アンテナ。   The microwave antenna according to claim 1, wherein a gap for ventilation is formed between the housing and the back surface. カセグレン型であることを特徴とする請求項１〜３の何れか１項に記載のマイクロ波用アンテナ。   The microwave antenna according to any one of claims 1 to 3, wherein the antenna is a cassegrain type. 収容した内容物を高温で処理する装置に装着され、マイクロ波を炉内に送信し、前記内容物で反射された反射マイクロ波を検波して該内容物の堆積量を検知するレベル計であって、
前記装置の底面と対向して形成された開口部に、請求項１〜４の何れか１項に記載のマイクロ波用アンテナが前記送受信面を装置内部に向けて装着され、かつ、マイクロ波の送受信の制御及び受信したマイクロ波を基に前記内容物の堆積量の算出を行う制御部、並びに前記マイクロ波発振器が装置外に配設されていることを特徴とするマイクロ波レベル計。 This is a level meter that is installed in a device that processes the contained contents at a high temperature, transmits microwaves into the furnace, detects the reflected microwaves reflected by the contents, and detects the amount of accumulated contents. And
The microwave antenna according to any one of claims 1 to 4 is mounted in an opening formed facing the bottom surface of the device with the transmitting / receiving surface facing the inside of the device, and A microwave level meter comprising: a control unit that performs transmission / reception control and calculation of an accumulation amount of the contents based on a received microwave; and the microwave oscillator is disposed outside the apparatus. 前記マイクロ波発振器が、前記ＲＦ送受信部と前記制御部との間に挿入されることを特徴とする請求項５記載のマイクロ波レベル計。   6. The microwave level meter according to claim 5, wherein the microwave oscillator is inserted between the RF transceiver unit and the control unit.
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Cited By (5)

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Publication number Priority date Publication date Assignee Title
JP2008170223A (en) * 2007-01-10 2008-07-24 Toshiba Corp Measuring method of water level of nuclear reactor and its device
JP2012188589A (en) * 2011-03-11 2012-10-04 Wire Device:Kk Apparatus for measuring coal charge level of coke oven
JP2014019706A (en) * 2012-07-12 2014-02-03 Jfe Steel Corp Method and device for measuring rising-up amount when pushing out coke cake
JP2018066589A (en) * 2016-10-17 2018-04-26 株式会社Ｗａｄｅｃｏ Surface detection device of high-temperature object
CN110361072A (en) * 2019-06-28 2019-10-22 江苏维航精仪科技有限公司 A kind of radar levelmeter antenna with cooling purging structure

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JP2001116537A (en) * 1999-10-19 2001-04-27 Nkk Corp Measurement method and device of shape for coke furnace wall
JP2002243845A (en) * 2001-02-14 2002-08-28 Shinko Mex Co Ltd Radar device and distance measuring method by the same
JP2003207382A (en) * 2002-01-10 2003-07-25 Jfe Engineering Kk Method and device for measuring accumulated height of deposit in container

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JPS60108149A (en) * 1983-11-16 1985-06-13 Sumitomo Metal Ind Ltd Detector for slag outflow
JP2001116537A (en) * 1999-10-19 2001-04-27 Nkk Corp Measurement method and device of shape for coke furnace wall
JP2002243845A (en) * 2001-02-14 2002-08-28 Shinko Mex Co Ltd Radar device and distance measuring method by the same
JP2003207382A (en) * 2002-01-10 2003-07-25 Jfe Engineering Kk Method and device for measuring accumulated height of deposit in container

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008170223A (en) * 2007-01-10 2008-07-24 Toshiba Corp Measuring method of water level of nuclear reactor and its device
JP2012188589A (en) * 2011-03-11 2012-10-04 Wire Device:Kk Apparatus for measuring coal charge level of coke oven
JP2014019706A (en) * 2012-07-12 2014-02-03 Jfe Steel Corp Method and device for measuring rising-up amount when pushing out coke cake
JP2018066589A (en) * 2016-10-17 2018-04-26 株式会社Ｗａｄｅｃｏ Surface detection device of high-temperature object
CN110361072A (en) * 2019-06-28 2019-10-22 江苏维航精仪科技有限公司 A kind of radar levelmeter antenna with cooling purging structure
CN110361072B (en) * 2019-06-28 2021-02-26 江苏维航精仪科技有限公司 Radar level meter antenna with cooling sweeps structure

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