JP3869640B2 - Freezing damage prevention device - Google Patents

Freezing damage prevention device Download PDF

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Publication number
JP3869640B2
JP3869640B2 JP2000263914A JP2000263914A JP3869640B2 JP 3869640 B2 JP3869640 B2 JP 3869640B2 JP 2000263914 A JP2000263914 A JP 2000263914A JP 2000263914 A JP2000263914 A JP 2000263914A JP 3869640 B2 JP3869640 B2 JP 3869640B2
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Japan
Prior art keywords
water
chamber
gas
rubber partition
freezing
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JP2002081746A (en
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秋仁 蜂矢
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Rinnai Corp
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Rinnai Corp
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Priority to JP2000263914A priority Critical patent/JP3869640B2/en
Priority to KR10-2001-0044520A priority patent/KR100425801B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00—Details
    • F24D19/0095—Devices for preventing damage by freezing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/10—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium
    • F24H1/107—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium using fluid fuel

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel Cell (AREA)
  • Fluid-Driven Valves (AREA)
  • Feeding And Controlling Fuel (AREA)
  • Pipe Accessories (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、水の凍結による器具類の破損を防止する凍結破損防止装置に関するものである。
【０００２】
【従来の技術】
この種の技術として、特開平１０−２８１５５６号公報に開示された技術が知られている。この技術は、多数の独立気泡を有するスポンジを水の通路に配置したものであり、水の凍結による体積の膨張をスポンジに吸収させることで、器具類の破損を防止しようとしたものである。
【０００３】
【発明が解決しようとする課題】
従来技術で用いられていたスポンジは、液状の樹脂の内部で発泡を行って樹脂を硬化させるものであり、独立気泡を覆う樹脂の気泡膜が薄いものであった。このため、スポンジは繰り返しの変形によってヘタリが発生してしまうため、凍結によって収縮と拡張を繰り返すと、スポンジが弾性を失って体積膨張を吸収する性質を失い、凍結破損を防ぐ性能が劣化する不具合があった。
【０００４】
また、特開平１０−２８１５５６号公報のように、ガバナ弁を搭載した水圧応動装置の２次室にスポンジを配置した場合、２次室の圧力を受けてスポンジの各独立気泡が圧縮されて反発力を発生し、ガバナ特性にヒステリシスが生じてしまう。ガバナ特性にヒステリシスが生じると、水圧の変動によって水量が変化し、給湯器の場合では出湯温度が変化する不具合が発生してしまう。
【０００５】
【発明の目的】
本発明は、上記の事情に鑑みてなされたもので、その目的は、凍結によって収縮と拡張を繰り返しても、体積膨張を吸収する性質を失うことなく長期に亘って安定して凍結破損を防ぐことができる凍結破損防止装置の提供にある。
【０００６】
【課題を解決するための手段】
この発明は、上記の目的を達成するために次の手段を採用する。
〔請求項１の手段〕
凍結破損防止装置は、水が存在し、その水が凍結する可能性のある容器や通路の内壁に装着され、この内壁との間に気体室を形成するゴム区画膜を具備するものである。
さらに、前記ゴム区画膜は、ガバナ弁の２次室内に配置されて、この２次室内に前記気体室を形成するものであり、
この気体室は、大気に連通して設けられていることを特徴とする。
【０００７】
〔請求項２の手段〕
請求項１の凍結破損防止装置において、
前記ゴム区画膜は、このゴム区画膜を前記内壁に設けられた凹部に圧入するための金属がモールドされていることを特徴とする。
【０００９】
【作用および発明の効果】
〔請求項１の作用および効果〕
水が凍結して体積が膨張すると、水の凍結部位に配置されたゴム区画膜が圧迫され、気体室が収縮する。このように、水の凍結による体積膨張を、気体室の収縮によって吸収するため、水の凍結による器具や配管等の破損が防止できる。
【００１０】
気体室を区画するゴム区画膜は、従来のスポンジにおける樹脂の気泡膜に比較して十分に厚くできるため、ゴム区画膜は、繰り返しの変形を受けてもヘタリが発生しにくい。このため、繰り返しの凍結によってゴム区画膜が繰り返して変形しても、弾性を失うことがなく、長期に亘って安定して凍結破損を防ぐことができる。
ガバナ弁の２次室に気体室を配置し、気体室を大気に連通させることによって、気体の圧縮による反発力が無く、ガバナ特性のヒステリシスを解消することができる。
【００１１】
〔請求項２の作用および効果〕
ゴム区画膜に、圧入用の金属をモールドしたため、ゴム区画膜で区画される気体室のシール性を向上できる。
【００１３】
【発明の実施の形態】
本発明の実施の形態を、実施例および変形例を用いて説明する。
〔実施例〕
図１は水圧応動装置の要部断面図を含むガス給湯器の概略図である。
ガス給湯器は、水入口から出湯口１までの給水通路２と、ガス入口からガスバーナ３までのガス通路４とを備える。
【００１４】
給水通路２は、上流側より下流に向けて、流路を開閉する水栓５、水圧に応答してガス通路４を開閉する水圧応動装置６、ガスバーナ３で発生した熱によって通過する水を加熱する熱交換器７が配置されている。
ガス通路４は、上流側より下流に向けて、流路を開閉する器具栓８、水圧応動装置６によって作動する水圧応動弁９、ガスバーナ３内にガスを噴射するガス噴射ノズル１０が設けられている。
【００１５】
水圧応動装置６は、水圧変動を受けても水量を一定に保つためのガバナ弁１１が一体に設けられたものであり、このガバナ弁１１は水室を１次室１２と２次室１３に区画するダイヤフラム１４の中心軸上に取り付けられている。
１次室１２はガバナ弁１１を通過した水が流れる部屋で、この１次室１２の出口流路には、通過する水量を調節することによって出湯温度を調節するための湯温調節器１５が設けられている。そして、湯温調節器１５を通過した水は、ベンチュリ１６を通って熱交換器７に供給される。
【００１６】
ベンチュリ１６は、流路を絞るとともに、流路に対して直角方向に横孔１７が設けられており、その横孔１７が２次室１３に通じている。このため、ベンチュリ１６に水が流れると、ベンチュリ効果によって横孔１７を通じて２次室１３の圧力が下がり、ダイヤフラム１４が２次室１３側へ変移する。すると、ダイヤフラム１４に対して垂直方向に取り付けられていた出力軸１８が水圧応動装置６の外側に突出する。ここで、水圧応動弁９は、出力軸１８の突出力を受けて開くように設けられている。このため、水栓５を開き、ベンチュリ１６に水が流れてダイヤフラム１４が２次室１３側に変移すると、水圧応動弁９がガス通路４を開くように作用する。
【００１７】
水栓５が閉じられると、ベンチュリ１６の水の流れが停止する。すると、ベンチュリ効果がなくなるため、１次室１２と２次室１３の圧差がなくなり、ダイヤフラム１４が元の位置に戻る。つまり、２次室１３側に変移していたダイヤフラム１４が１次室１２側に戻り、出力軸１８が水圧応動装置６の内側に戻る。この結果、水圧応動弁９がガス通路４を閉じるように作用する。
【００１８】
なお、１次室１２および２次室１３は、外部に連通する水抜き孔（図示しない）が設けられており、その水抜き孔は水抜き栓（図示しない）によって塞がれている。そして、水抜き栓を手動操作によって取り外すことにより、１次室１２および２次室１３の水が外部へ抜けるように設けられている。
【００１９】
水圧応動装置６の２次室１３を形成するカバー２０の内壁２０ａには、この内壁２０ａとの間に気体室２１を形成するゴム区画膜２２が装着されている。
このゴム区画膜２２は、ナイロンなど適度な硬度を有した弾性体によって形成されるものであり、図３（ａ）〜（ｃ）に示すように、断面略コ字形の環状体であり、ゴム材料の内部には、内壁２０ａに設けられた環状の凹部にゴム区画膜２２を圧入するためのリング状の金属２３が２つモールドされている。
【００２０】
ゴム区画膜２２によって区画された気体室２１は、カバー２０に形成された連通孔（図示しない）を介して大気に連通して設けられている。ここで、気体室２１を密封した場合、２次室１３内の圧力による気体室２１の圧縮の反発力により、ガバナ特性にヒステリシスが生じて水量が変化し、出湯温度が変化する不具合が発生してしまう。そこで、この実施例のように気体室２１を大気に連通することにより、気体室２１の気体による反発力がなくなり、ガバナ特性のヒステリシスを無くすことができる。この結果、水量が安定して、給湯器の出湯温度が変化する不具合がなくなる。
【００２１】
なお、水の凍結による体積膨張率は、９．２％であるため、体積膨張の全てを気体室２１の圧縮によって吸収するように設けても良いが、体積膨張の一部を気体室２１の変形で吸収するように設けて、他の体積膨張分を水圧応動装置を構成する部品の強度によって破損を防ぐようにしても良い。
【００２２】
次に、凍結時の作動を説明する。
水抜きを忘れた状態で凍結が始まると、その凍結は通水路から始まり、熱容量の大きな水圧応動装置６は最後に凍結する。このため、１次室１２および２次室１３内の水が閉じ込められた状態で凍結が開始される。１次室１２および２次室１３内が凍結すると、水の体積が９．２％膨張する。その膨張によって、２次室１３内に配置されたゴム区画膜２２が圧迫される。すると、ゴム区画膜２２で区画された気体室２１が圧迫により収縮し、凍結による体積膨張を吸収する（図２参照）。
気温が上昇して凍結した氷が水に戻ると、ゴム区画膜２２に対する圧迫力が解除されるため、ゴム区画膜２２が元の形状に復帰する。
【００２３】
このように、水抜きを忘れて水圧応動装置６が凍結した場合は、ゴム区画膜２２の変形による気体室２１の収縮によって凍結による膨張を吸収するため、水圧応動装置６の変形や破損を防ぐことができる。
気体室２１を区画するゴム区画膜２２は、従来のスポンジにおける樹脂の気泡膜に比較して十分に厚くできるため、ゴム区画膜２２は、繰り返しの変形を受けてもヘタリが発生しにくい。このため、繰り返しの凍結によってゴム区画膜２２が繰り返して変形しても、弾性を失うことがなく、長期に亘って安定して凍結破損を防ぐことができる。
【００２４】
また、ゴム区画膜２２に、圧入用の金属２３をモールドしたため、気体室２１のシール性を長期に亘って保つことができる。
さらに、気体室２１を大気に連通させるように設けたため、ガバナ特性のヒステリシスを解消することができ、水量が安定して給湯器の出湯温度が変化する不具合がなくなる。
【図面の簡単な説明】
【図１】水圧応動装置の要部断面図を含むガス給湯器の概略図である（実施例）。
【図２】凍結時における水圧応動装置の要部断面図である（実施例）。
【図３】ゴム区画室の説明図である（実施例）。
【符号の説明】
６ 水圧応動装置
１１ ガバナ弁
１３ ２次室
２０ カバー（容器や通路）
２０ａ 内壁
２１ 気体室
２２ ゴム区画膜
２３ 金属[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a freeze damage prevention device for preventing damage to instruments due to freezing of water.
[0002]
[Prior art]
As this type of technique, a technique disclosed in Japanese Patent Laid-Open No. 10-281556 is known. In this technique, a sponge having a large number of closed cells is arranged in a water passage, and an attempt is made to prevent damage to instruments by causing the sponge to absorb volume expansion due to freezing of water.
[0003]
[Problems to be solved by the invention]
The sponge used in the prior art is one that foams inside a liquid resin to cure the resin, and the resin bubble film covering the closed cells is thin. For this reason, since the sponge will be damaged due to repeated deformation, if it shrinks and expands repeatedly due to freezing, the sponge loses its elasticity and absorbs volume expansion, and the ability to prevent freezing damage deteriorates. was there.
[0004]
Further, as in JP-A-10-281556, when a sponge is disposed in a secondary chamber of a hydraulic pressure response device equipped with a governor valve, each independent bubble of the sponge is compressed and repelled by receiving the pressure in the secondary chamber. Force is generated and hysteresis occurs in the governor characteristics. When hysteresis occurs in the governor characteristics, the amount of water changes due to fluctuations in water pressure, and in the case of a water heater, a problem occurs in which the hot water temperature changes.
[0005]
OBJECT OF THE INVENTION
The present invention has been made in view of the above circumstances, and its purpose is to prevent freeze breakage stably over a long period of time without losing the property of absorbing volume expansion even when contraction and expansion are repeated by freezing. An object of the present invention is to provide a freeze breakage prevention device.
[0006]
[Means for Solving the Problems]
The present invention employs the following means to achieve the above object.
[Means of Claim 1]
The freeze breakage prevention apparatus is provided with a rubber partition film that is attached to an inner wall of a container or a passage in which water is present and the water may freeze, and forms a gas chamber between the inner wall.
Furthermore, the rubber partition membrane is disposed in the secondary chamber of the governor valve, and forms the gas chamber in the secondary chamber,
This gas chamber is provided in communication with the atmosphere.
[0007]
[Means of claim 2]
In the freeze damage prevention device according to claim 1,
The rubber partition film is characterized by being molded with a metal for press-fitting the rubber partition film into a recess provided in the inner wall.
[0009]
[Operation and effect of the invention]
[Operation and effect of claim 1]
When water freezes and the volume expands, the rubber partition membrane arranged at the water freezing site is compressed and the gas chamber contracts. Thus, since the volume expansion due to freezing of water is absorbed by the contraction of the gas chamber, it is possible to prevent damage to instruments and piping due to freezing of water.
[0010]
Since the rubber partition film that partitions the gas chamber can be made sufficiently thicker than the resin bubble film in the conventional sponge, the rubber partition film is less likely to be set even if it undergoes repeated deformation. For this reason, even if the rubber partition membrane is repeatedly deformed by repeated freezing, the elasticity is not lost, and freeze damage can be prevented stably over a long period of time.
By arranging the gas chamber in the secondary chamber of the governor valve and communicating the gas chamber with the atmosphere, there is no repulsive force due to the compression of the gas, and the hysteresis of the governor characteristics can be eliminated.
[0011]
[Operation and effect of claim 2]
Since the metal for press-fitting is molded in the rubber partition film, the sealing performance of the gas chamber partitioned by the rubber partition film can be improved.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described using examples and modifications.
〔Example〕
FIG. 1 is a schematic view of a gas water heater including a cross-sectional view of a main part of a water pressure actuator.
The gas water heater includes a water supply passage 2 from the water inlet to the hot water outlet 1 and a gas passage 4 from the gas inlet to the gas burner 3.
[0014]
The water supply passage 2 heats the water passing from the upstream side to the downstream side by the faucet 5 that opens and closes the flow passage, the water pressure responsive device 6 that opens and closes the gas passage 4 in response to water pressure, and the heat generated in the gas burner 3. A heat exchanger 7 is arranged.
The gas passage 4 is provided with an instrument plug 8 that opens and closes the flow path from the upstream side to the downstream side, a water pressure responsive valve 9 that is operated by the water pressure responsive device 6, and a gas injection nozzle 10 that injects gas into the gas burner 3. Yes.
[0015]
The water pressure responsive device 6 is integrally provided with a governor valve 11 for keeping the amount of water constant even when subjected to fluctuations in water pressure. The governor valve 11 has a water chamber divided into a primary chamber 12 and a secondary chamber 13. It is mounted on the central axis of the diaphragm 14 to be partitioned.
The primary chamber 12 is a chamber through which water that has passed through the governor valve 11 flows, and a hot water temperature controller 15 for adjusting the temperature of the hot water by adjusting the amount of water passing through the primary chamber 12 is provided in the outlet channel of the primary chamber 12. Is provided. The water that has passed through the hot water temperature controller 15 is supplied to the heat exchanger 7 through the venturi 16.
[0016]
The venturi 16 narrows the flow path and is provided with a horizontal hole 17 in a direction perpendicular to the flow path. The horizontal hole 17 communicates with the secondary chamber 13. For this reason, when water flows into the venturi 16, the pressure in the secondary chamber 13 decreases through the lateral hole 17 due to the venturi effect, and the diaphragm 14 changes to the secondary chamber 13 side. Then, the output shaft 18 attached to the diaphragm 14 in the vertical direction protrudes to the outside of the hydraulic response device 6. Here, the water pressure responsive valve 9 is provided so as to open upon receiving the output of the output shaft 18. For this reason, when the faucet 5 is opened and water flows into the venturi 16 and the diaphragm 14 changes to the secondary chamber 13 side, the water pressure responsive valve 9 acts to open the gas passage 4.
[0017]
When the faucet 5 is closed, the flow of water in the venturi 16 stops. Then, since the venturi effect disappears, the pressure difference between the primary chamber 12 and the secondary chamber 13 disappears, and the diaphragm 14 returns to the original position. That is, the diaphragm 14 that has been changed to the secondary chamber 13 side returns to the primary chamber 12 side, and the output shaft 18 returns to the inside of the hydraulic pressure actuator 6. As a result, the water pressure responsive valve 9 acts to close the gas passage 4.
[0018]
The primary chamber 12 and the secondary chamber 13 are provided with a drain hole (not shown) communicating with the outside, and the drain hole is closed by a drain plug (not shown). And it is provided so that the water of the primary chamber 12 and the secondary chamber 13 may come out outside by removing a drain plug by manual operation.
[0019]
On the inner wall 20a of the cover 20 forming the secondary chamber 13 of the water pressure responsive device 6, a rubber partition film 22 forming a gas chamber 21 is mounted between the inner wall 20a and the inner wall 20a.
The rubber partition film 22 is formed of an elastic body having an appropriate hardness such as nylon, and is an annular body having a substantially U-shaped cross section as shown in FIGS. 3 (a) to 3 (c). Two ring-shaped metals 23 for press-fitting the rubber partition film 22 into the annular recess provided in the inner wall 20a are molded inside the material.
[0020]
The gas chamber 21 partitioned by the rubber partition film 22 is provided in communication with the atmosphere via a communication hole (not shown) formed in the cover 20. Here, when the gas chamber 21 is sealed, due to the repulsive force of the compression of the gas chamber 21 due to the pressure in the secondary chamber 13, hysteresis occurs in the governor characteristics, the water amount changes, and the tapping temperature changes. End up. Therefore, by connecting the gas chamber 21 to the atmosphere as in this embodiment, the repulsive force due to the gas in the gas chamber 21 is eliminated, and the hysteresis of the governor characteristic can be eliminated. As a result, the amount of water is stabilized, and there is no inconvenience that the hot water temperature of the water heater changes.
[0021]
Since the volume expansion rate due to freezing of water is 9.2%, it may be provided so that all of the volume expansion is absorbed by the compression of the gas chamber 21, but part of the volume expansion of the gas chamber 21 It may be provided so as to be absorbed by deformation, and other volume expansion may be prevented from being damaged by the strength of the parts constituting the hydraulic response device.
[0022]
Next, the operation during freezing will be described.
When freezing starts in a state where water draining is forgotten, the freezing starts from the water passage, and the water pressure actuator 6 having a large heat capacity is finally frozen. For this reason, freezing is started in a state where water in the primary chamber 12 and the secondary chamber 13 is confined. When the primary chamber 12 and the secondary chamber 13 are frozen, the volume of water expands by 9.2%. By the expansion, the rubber partition film 22 disposed in the secondary chamber 13 is pressed. Then, the gas chamber 21 partitioned by the rubber partition film 22 contracts due to the compression, and absorbs volume expansion due to freezing (see FIG. 2).
When the temperature rises and the frozen ice returns to the water, the pressing force on the rubber partition film 22 is released, so that the rubber partition film 22 returns to its original shape.
[0023]
As described above, when the water pressure responsive device 6 is frozen due to forgetting to drain water, the expansion due to the freezing is absorbed by the contraction of the gas chamber 21 due to the deformation of the rubber partition film 22, so that the water pressure responsive device 6 is prevented from being deformed or damaged. be able to.
Since the rubber partition film 22 that partitions the gas chamber 21 can be made sufficiently thicker than the resin bubble film in the conventional sponge, the rubber partition film 22 is unlikely to be damaged even when subjected to repeated deformation. For this reason, even if the rubber partition film 22 is repeatedly deformed by repeated freezing, the elasticity is not lost, and freeze damage can be prevented stably over a long period of time.
[0024]
In addition, since the metal 23 for press fitting is molded on the rubber partition film 22, the sealing property of the gas chamber 21 can be maintained for a long time.
Further, since the gas chamber 21 is provided so as to communicate with the atmosphere, the hysteresis of the governor characteristic can be eliminated, and there is no problem that the amount of water is stabilized and the hot water temperature of the water heater is changed.
[Brief description of the drawings]
FIG. 1 is a schematic view of a gas water heater including a cross-sectional view of a main part of a water pressure actuator (Example).
FIG. 2 is a cross-sectional view of a main part of the water pressure responsive device during freezing (Example).
FIG. 3 is an explanatory view of a rubber compartment (Example).
[Explanation of symbols]
6 Water pressure actuator 11 Governor valve 13 Secondary chamber 20 Cover (container or passage)
20a Inner wall 21 Gas chamber 22 Rubber partition film 23 Metal

Claims (2)

水が存在し、その水が凍結する可能性のある容器や通路の内壁に装着され、この内壁との間に気体室を形成するゴム区画膜を具備し、
前記ゴム区画膜は、ガバナ弁の２次室内に配置されて、この２次室内に前記気体室を形成するものであり、
この気体室は、大気に連通して設けられていることを特徴とする凍結破損防止装置。Water is present, the water is mounted on the inner wall of the container and the passage that may be frozen, comprising a rubber partition film to form a gas chamber between the inner wall,
The rubber partition membrane is disposed in a secondary chamber of a governor valve, and forms the gas chamber in the secondary chamber,
The freeze damage prevention device , wherein the gas chamber is provided in communication with the atmosphere . 請求項１の凍結破損防止装置において、
前記ゴム区画膜は、このゴム区画膜を前記内壁に設けられた凹部に圧入するための金属がモールドされていることを特徴とする凍結破損防止装置。In the freeze damage prevention device according to claim 1,
The rubber partition membrane is molded with a metal for press-fitting the rubber partition membrane into a recess provided in the inner wall.
JP2000263914A 2000-08-31 2000-08-31 Freezing damage prevention device Expired - Fee Related JP3869640B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2000263914A JP3869640B2 (en) 2000-08-31 2000-08-31 Freezing damage prevention device
KR10-2001-0044520A KR100425801B1 (en) 2000-08-31 2001-07-24 Apparatus for preventing breakage by freezing of water governor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000263914A JP3869640B2 (en) 2000-08-31 2000-08-31 Freezing damage prevention device

Publications (2)

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JP2002081746A JP2002081746A (en) 2002-03-22
JP3869640B2 true JP3869640B2 (en) 2007-01-17

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JP5206533B2 (en) * 2009-03-25 2013-06-12 Ｔｏｔｏ株式会社 Valve device
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KR200466174Y1 (en) 2011-02-22 2013-04-03 (주)엘라켐 Packing for transformer
CN109869894A (en) * 2019-02-26 2019-06-11 华帝股份有限公司 Novel pressure regulating cabin and gas water heater

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US4485636A (en) * 1983-11-10 1984-12-04 Hilado Rolando V Container with cooling capability
KR910006577A (en) * 1989-09-18 1991-04-29 김규홍 Antistatic with Compression Water Pipes
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