JP2550877B2 - Antenna snow melting device - Google Patents
Antenna snow melting deviceInfo
- Publication number
- JP2550877B2 JP2550877B2 JP5218128A JP21812893A JP2550877B2 JP 2550877 B2 JP2550877 B2 JP 2550877B2 JP 5218128 A JP5218128 A JP 5218128A JP 21812893 A JP21812893 A JP 21812893A JP 2550877 B2 JP2550877 B2 JP 2550877B2
- Authority
- JP
- Japan
- Prior art keywords
- reflecting mirror
- snow melting
- chamber
- melting device
- warm air
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Aerials With Secondary Devices (AREA)
- Details Of Aerials (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、反射鏡背面を断熱材で
覆って閉空間（チャンバー）を形成し、このチャンバー
内に設置された発熱手段によって、間接的に反射鏡を温
めるアンテナ融雪装置に関し、特に、反射鏡裏面で暖気
の乱流を生じさせることによって、チャンバー内の熱を
効果的に反射鏡に伝達させることができ、効率良く融雪
を行なえるようにしたアンテナ融雪装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna snow melting device in which a rear surface of a reflecting mirror is covered with a heat insulating material to form a closed space (chamber), and a reflecting means is indirectly heated by a heating means installed in the chamber. In particular, the present invention relates to an antenna snow melting device capable of effectively transmitting heat in a chamber to a reflecting mirror by causing a turbulent flow of warm air on the back surface of the reflecting mirror, thereby enabling efficient snow melting.
【０００２】[0002]
【従来の技術】従来から、衛星通信などに用いられる反
射鏡を有するアンテナには、反射鏡背面を断熱材で覆っ
てチャンバーを形成し、このチャンバー内に設置された
ヒータ等の発熱手段により間接的に反射鏡を温めて、反
射鏡に積った雪を融かすアンテナ融雪装置を備えたもの
があった。例えば、特開平３−８９７０２号の公報で
は、チャンバー内に設置したヒータから放出される暖気
を、サーキュレータあるいはブロアによって攪拌し、チ
ャンバー内の温度分布を適度に調整しながら融雪を行な
う構成のアンテナ融雪装置が提案されている。2. Description of the Related Art Conventionally, in an antenna having a reflecting mirror used for satellite communication or the like, a chamber is formed by covering the rear surface of the reflecting mirror with a heat insulating material, and is indirectly connected by a heat generating means such as a heater installed in the chamber. There was one equipped with an antenna snow melting device that heats the reflecting mirror and melts the snow accumulated on the reflecting mirror. For example, in Japanese Patent Application Laid-Open No. 3-89702, an antenna snow melting structure in which warm air emitted from a heater installed in a chamber is agitated by a circulator or a blower, and snow is melted while appropriately adjusting the temperature distribution in the chamber A device has been proposed.
【０００３】[0003]
【発明が解決しようとする課題】このような従来のアン
テナ融雪装置では、効率良く融雪を行なわせるため、温
風発生器の配置を工夫したり、サーキュレータや攪拌用
ブロアを用いたりして、チャンバー内の温度分布の調整
を試みていた。また、チャンバー内の材質に関しては、
より熱伝導率の小さな断熱材の検討が行なわれてきた。
ところが、従来のアンテナ融雪装置には、チャンバーの
構造に改良を施したものがなく、チャンバーは、平面状
の反射鏡裏面を断熱材で覆っただけの構成となってい
た。このため、従来のアンテナ融雪装置では、チャンバ
ー内の暖気が平面状の反射鏡裏面に沿って流れ、図４に
示すような層流を形成していた。本発明者が算出したと
ころ、暖気が層流で流れた場合の熱伝達率は、暖気が乱
流で流れた場合の熱伝達率のおよそ２８％以下であり、
このような従来のアンテナ融雪装置では、暖気の熱伝達
率が小さく、チャンバー内の熱が反射鏡に伝達しにくい
という問題点があった。In such a conventional antenna snow melting apparatus, in order to efficiently perform the snow melting, the arrangement of the warm air generator is devised, the circulator or the agitation blower is used, and the chamber I was trying to adjust the temperature distribution inside. Regarding the material inside the chamber,
Insulation materials with lower thermal conductivity have been investigated.
However, the conventional antenna snow melting device has no improvement in the structure of the chamber, and the chamber has a structure in which the back surface of the planar reflecting mirror is simply covered with a heat insulating material. Therefore, in the conventional antenna snow melting device, warm air in the chamber flows along the back surface of the planar reflecting mirror to form a laminar flow as shown in FIG. As calculated by the inventor, the heat transfer coefficient when the warm air flows in a laminar flow is about 28% or less of the heat transfer coefficient when the warm air flows in a turbulent flow.
Such a conventional antenna snow melting device has a problem in that the heat transfer coefficient of warm air is small and the heat in the chamber is difficult to transfer to the reflecting mirror.
【０００４】本発明は、上記問題点にかんがみてなされ
たものであり、反射鏡裏面上で暖気の乱流を生じさせる
ことによって、チャンバー内の熱を効果的に反射鏡に伝
達させることができ、効率良く融雪を行なえるアンテナ
融雪装置の提供を目的とする。The present invention has been made in view of the above problems, and the heat in the chamber can be effectively transferred to the reflecting mirror by causing a turbulent flow of warm air on the rear surface of the reflecting mirror. An object of the present invention is to provide an antenna snow melting device that can efficiently perform snow melting.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するため
に、本発明のアンテナ融雪装置は、反射鏡裏面を断熱材
で覆ってチャンバーを形成し、このチャンバー内に設置
された発熱手段によって間接的に反射鏡を温めるアンテ
ナ融雪装置であって、前記反射鏡裏面の全体又は任意の
箇所を乱流の生じ易い連続する凹凸形状及び／又は連続
する波形形状としてある。In order to achieve the above object, the antenna snow melting apparatus of the present invention forms a chamber by covering the back surface of a reflecting mirror with a heat insulating material, and indirectly by a heating means installed in this chamber. In an antenna snow melting device for warming a reflecting mirror, the entire back surface of the reflecting mirror or an arbitrary portion thereof has a concavo-convex shape and / or a continuous corrugated shape in which turbulent flow easily occurs.
【０００６】[0006]
【作用】上記構成からなる本発明のアンテナ融雪装置に
よれば、凹凸形状又は波形形状などの乱流の生じ易い形
状とした反射鏡裏面の全体又は任意の箇所では、暖気が
乱流して熱伝達率が大きくなる。したがって、チャンバ
ー内の熱を反射鏡の効果的に伝達させることができる。According to the antenna snow melting apparatus of the present invention having the above-mentioned structure, warm air is turbulently flowed and heat is transferred to the entire rear surface of the reflecting mirror having an irregular shape or a corrugated shape or the like on which a turbulent flow is likely to occur or at an arbitrary position. The rate increases. Therefore, the heat in the chamber can be effectively transmitted by the reflecting mirror.
【０００７】[0007]
【実施例】以下、本発明のアンテナ融雪装置の実施例に
ついて説明する。まず、チャンバー内の暖気が層流で流
れた場合と乱流で流れた場合の熱伝達率の違いを説明す
る。反射鏡の熱伝導率をλ，代表長さをｌとすると、チ
ャンバー内の暖気の熱伝達率αは（１）式で表わされ
る。ここで、Ｎｕは局所ヌセルト数であり、（２），
（３）式で表わされる。ここで、Ｐｒはプラントル数、
Ｒｅはレイノルズ数である。EXAMPLE An example of the antenna snow melting apparatus of the present invention will be described below. First, the difference in heat transfer coefficient between when the warm air in the chamber flows in a laminar flow and when it flows in a turbulent flow will be described. Assuming that the heat conductivity of the reflecting mirror is λ and the representative length is 1, the heat transfer coefficient α of warm air in the chamber is expressed by the equation (1). Where Nu is the local Nusselt number and (2),
It is expressed by equation (3). Where Pr is the Prandtl number,
Re is the Reynolds number.
【０００８】 α＝（Ｎｕλ）／ｌ・・・・（１）Α = (Nuλ) / l ... (1)
【０００９】 層流の場合 Ｎｕ＝０．３３２Ｐｒ1/3Ｒｅ1/2；Ｐｒ＞０．５・・・・（２） 乱流の場合 Ｎｕ＝０．０２９６Ｐｒ2/3Ｒｅ4/5；０．５＜Ｐｒ＜５・・・・（３）In the case of laminar flow Nu = 0.332 Pr 1/3 Re 1/2 ; Pr> 0.5 ... (2) In the case of turbulent flow Nu = 0.0296 Pr 2/3 Re 4/5 ; 0 .5 <Pr <5 ... (3)
【００１０】これら（１）〜（３）式により、熱伝達率
αが最大又は最小になるのは、Ｒｅが最大又は最小にな
るときである。ここで、最も熱伝達の良い状態の層流
（すなわち、最大のＲｅを用いた層流）の熱伝達率と、
最も熱伝達の悪い状態の乱流（すなわち、最小のＲｅを
用いた乱流）の熱伝達率を比較すると、平面に沿う暖気
の流れが層流から乱流に変移するのは、Ｒｅ＝３．２×
１０5 程度以上からであることが分かる。よって、層流
の最大のＲｅと乱流の最小のＲｅを、もとに３．２×１
０5 とし、また、自然大気では、通常、Ｐｒは０．７に
ほぼ等しいから、これらの値を（１）式に代入すると、
（４），（５）式となる。According to these equations (1) to (3), the heat transfer coefficient α becomes maximum or minimum when Re becomes maximum or minimum. Here, the heat transfer coefficient of the laminar flow with the best heat transfer (that is, the laminar flow using the maximum Re),
Comparing the heat transfer coefficients of the turbulent flow with the worst heat transfer (that is, the turbulent flow using the minimum Re), the warm air flow along the plane changes from laminar flow to turbulent flow at Re = 3. .2 ×
It can be seen that it is from 10 5 or more. Therefore, based on the maximum Re of the laminar flow and the minimum Re of the turbulent flow, 3.2 × 1
0 5 and then, also, the natural air, usually, the value Pr is approximately equal to 0.7, and substituting these values into equation (1),
Equations (4) and (5) are obtained.
【００１１】層流の熱伝達率 α1≒（１．６７×１０2）・λ／ｌ以下・・・・（４） 乱流の熱伝達率 αt≒（５．９２×１０2）・λ／ｌ以下・・・・（５）Laminar heat transfer coefficient α 1 ≈ (1.67 × 10 2 ) · λ / l or less ... (4) Turbulent heat transfer coefficient α t ≈ (5.92 × 10 2 ) ・λ / l or less ... (5)
【００１２】これら（４），（５）式から分かるよう
に、層流は乱流に比べ、熱伝達率がおよそ２８％以下で
ある。したがって、チャンバー内の熱を反射鏡により効
率良く伝達させるためには、暖気の流れをレイノルズ数
の大きな乱流にすることが効果的である。As can be seen from these equations (4) and (5), the heat transfer coefficient of laminar flow is about 28% or less as compared with turbulent flow. Therefore, in order to efficiently transfer the heat in the chamber to the reflecting mirror, it is effective to make the flow of warm air into a turbulent flow having a large Reynolds number.
【００１３】図１は、本発明の第一実施例に係るアンテ
ナ融雪装置を示すものであり、同図（ａ）は側面断面
図，同図（ｂ）は（ａ）のＡ−Ａ断面図である。この第
一実施例に係るアンテナ融雪装置は、反射鏡裏面全体を
連続する凹凸形状にした構成としてある。1A and 1B show an antenna snow melting apparatus according to a first embodiment of the present invention. FIG. 1A is a side sectional view, and FIG. 1B is a sectional view taken along the line AA of FIG. Is. The antenna snow melting device according to the first embodiment has a configuration in which the entire back surface of the reflecting mirror has a continuous uneven shape.
【００１４】同図において、１はパラボラアンテナ等の
反射鏡であり、その裏面１ａ全体が連続する凹凸形状と
なっている。また、このような反射鏡裏面１ａを断熱材
３で覆うことによってチャンバー２を形成してある。さ
らに、チャンバー２の中央二箇所には、温風発生器４，
４が配設してある。このような構成からなる本実施例の
アンテナ融雪装置によれば、図２に示すように、温風発
生器４，４から放出された温風（暖気）は、反射鏡裏面
１ａの凹凸形状に当たりながら流れ、反射鏡裏面１ａ上
に乱流を形成する。これによって温風の熱伝達が大きく
なり、チャンバー２内の熱が反射鏡１全体に効果的に伝
達される。また、反射鏡裏面１ａを凹凸形状としたこと
によってこの反射鏡裏面１ａの表面積が大きくなり、す
なわち、反射鏡裏面１ａと温風の接触面積が大きくな
り、温風の熱が反射鏡１により効率良く吸収されるとい
った効果もある。In the figure, reference numeral 1 is a reflecting mirror such as a parabolic antenna, and the entire back surface 1a thereof has a concavo-convex shape. Further, the chamber 2 is formed by covering such a reflecting mirror back surface 1a with the heat insulating material 3. Furthermore, at the two central locations of the chamber 2, warm air generators 4,
4 are provided. According to the antenna snow melting device of this embodiment having such a configuration, as shown in FIG. 2, the warm air (warm air) emitted from the warm air generators 4 and 4 hits the uneven shape of the reflector back surface 1a. While flowing, a turbulent flow is formed on the back surface 1a of the reflecting mirror. This increases the heat transfer of the warm air, and the heat in the chamber 2 is effectively transferred to the entire reflecting mirror 1. Further, since the reflecting mirror back surface 1a has an uneven shape, the surface area of the reflecting mirror back surface 1a increases, that is, the contact area between the reflecting mirror back surface 1a and warm air increases, and the heat of the warm air is more efficiently reflected by the reflecting mirror 1. It also has the effect of being well absorbed.
【００１５】図３は本発明の第二実施例に係るアンテナ
融雪装置の反射鏡裏面を示す部分拡大断面図である。こ
の第二実施例に係るアンテナ融雪装置は、反射鏡１０の
裏面１０ａ全体を連続する波形形状にした構成としてあ
る。このような実施例によっても、温風発生器４，４か
ら放出された温風が反射鏡裏面１０ａ上で乱流を形成
し、チャンバー２内の熱が反射鏡１０全体に効果的に伝
達される。FIG. 3 is a partially enlarged sectional view showing the rear surface of the reflecting mirror of the antenna snow melting device according to the second embodiment of the present invention. In the antenna snow melting device according to the second embodiment, the entire back surface 10a of the reflecting mirror 10 has a continuous wavy shape. Also in this embodiment, the warm air emitted from the warm air generators 4 and 4 forms a turbulent flow on the reflecting mirror back surface 10a, and the heat in the chamber 2 is effectively transferred to the entire reflecting mirror 10. It
【００１６】なお、本発明のアンテナ融雪装置は、上述
した第一及び第二実施例に限定されるものではない。例
えば、上記実施例では、反射鏡裏面１ａ，１０ａ全体を
凹凸形状又は波形形状としたが、これは特に限定される
ものではなく、反射鏡裏面１ａ，１０ａの任意の箇所の
みを凹凸形状又は波形形状としてもよい。特に、パラボ
ラアンテナ等では、反射鏡の下側に雪が積もり易いの
で、反射鏡裏面の下側のみを凹凸形状又は波形形状とし
てもよい。また、チャンバー２内を温める発熱手段とし
ては、温風発生器４，４に限らず、ヒータの熱をサーキ
ュレータあるいはブロアーによって攪拌するといった他
の発熱手段を用いることもできる。The antenna snow melting apparatus of the present invention is not limited to the above-mentioned first and second embodiments. For example, in the above embodiment, the entire reflecting mirror back surfaces 1a and 10a have an uneven shape or a wavy shape, but this is not particularly limited, and only the arbitrary portions of the reflecting mirror back surfaces 1a and 10a have an uneven shape or a wavy shape. It may have a shape. In particular, in a parabolic antenna or the like, snow easily accumulates on the lower side of the reflecting mirror, and therefore only the lower side of the rear surface of the reflecting mirror may have an uneven shape or a wavy shape. Further, the heat generating means for heating the inside of the chamber 2 is not limited to the hot air generators 4 and 4, and other heat generating means such as stirring the heat of the heater by a circulator or a blower can be used.
【００１７】[0017]
【発明の効果】以上、説明したように、本発明のアンテ
ナ融雪装置によれば、反射鏡裏面上で暖気の乱流を生じ
させることによって、チャンバー内の熱を効果的に反射
鏡に伝達させることができ、効率の良い融雪を行なえ
る。As described above, according to the antenna snow melting apparatus of the present invention, the turbulent flow of warm air is generated on the rear surface of the reflecting mirror, so that the heat in the chamber is effectively transferred to the reflecting mirror. And can perform efficient snow melting.
【図１】本発明の第一実施例に係るアンテナ融雪装置を
示すものであり、同図（ａ）は側面断面図，同図（ｂ）
は（ａ）のＡ−Ａ断面図である。FIG. 1 shows an antenna snow melting device according to a first embodiment of the present invention, in which FIG. 1 (a) is a side sectional view and FIG. 1 (b).
FIG. 7A is a sectional view taken along line AA of FIG.
【図２】上記アンテナ融雪装置の反射鏡裏面を示す部分
拡大断面図である。FIG. 2 is a partially enlarged cross-sectional view showing a back surface of a reflecting mirror of the antenna snow melting device.
【図３】本発明の第二実施例に係るアンテナ融雪装置の
反射鏡裏面を示す部分拡大断面図である。FIG. 3 is a partial enlarged cross-sectional view showing a back surface of a reflecting mirror of an antenna snow melting device according to a second embodiment of the present invention.
【図４】従来例に係るアンテナ融雪装置の反射鏡裏面を
示す部分拡大断面図である。FIG. 4 is a partially enlarged cross-sectional view showing a back surface of a reflecting mirror of an antenna snow melting device according to a conventional example.
１，１０，１００ 反射鏡 １ａ，１０ａ，１１ａ 反射鏡裏面 ２ チャンバー ３ 断熱材 ４ 温風発生器 1,10,100 Reflecting mirror 1a, 10a, 11a Rear surface of reflecting mirror 2 Chamber 3 Heat insulating material 4 Hot air generator
Claims (1)
を形成し、このチャンバー内に設置された発熱手段によ
って間接的に反射鏡を温めるアンテナ融雪装置であっ
て、 前記反射鏡裏面の全体又は任意の箇所を乱流を生じやす
い連続する凹凸形状及び／又は連続する波形形状とした
ことを特徴とするアンテナ融雪装置。1. An antenna snow melting device in which a rear surface of a reflecting mirror is covered with a heat insulating material to form a chamber, and the reflecting mirror is indirectly heated by a heating means installed in the chamber. An antenna snow melting device, characterized in that an arbitrary portion has a continuous uneven shape and / or a continuous corrugated shape where turbulence is likely to occur.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5218128A JP2550877B2 (en) | 1993-08-10 | 1993-08-10 | Antenna snow melting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5218128A JP2550877B2 (en) | 1993-08-10 | 1993-08-10 | Antenna snow melting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0758529A JPH0758529A (en) | 1995-03-03 |
| JP2550877B2 true JP2550877B2 (en) | 1996-11-06 |
Family
ID=16715079
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5218128A Expired - Fee Related JP2550877B2 (en) | 1993-08-10 | 1993-08-10 | Antenna snow melting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2550877B2 (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61260701A (en) * | 1985-05-14 | 1986-11-18 | Fujitsu Ltd | Panel of melting snow for antenna |
| JPS63120401U (en) * | 1987-01-30 | 1988-08-04 | ||
| JPH05335829A (en) * | 1992-06-01 | 1993-12-17 | Nec Corp | Device for melting snow on antenna |
-
1993
- 1993-08-10 JP JP5218128A patent/JP2550877B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0758529A (en) | 1995-03-03 |
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