JP3723811B2 - refrigerator - Google Patents

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JP3723811B2
JP3723811B2 JP2003423500A JP2003423500A JP3723811B2 JP 3723811 B2 JP3723811 B2 JP 3723811B2 JP 2003423500 A JP2003423500 A JP 2003423500A JP 2003423500 A JP2003423500 A JP 2003423500A JP 3723811 B2 JP3723811 B2 JP 3723811B2
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refrigerant
electrical contact
contact portion
refrigerator
door
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JP2005030753A (en
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一夫 杉本
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Sharp Corp
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Sharp Corp
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Priority to PCT/JP2004/008778 priority patent/WO2004113805A1/en
Priority to MYPI20042405 priority patent/MY138747A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D29/00—Arrangement or mounting of control or safety devices
    • F25D29/006—Safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/12—Inflammable refrigerants
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2400/00—General features of, or devices for refrigerators, cold rooms, ice-boxes, or for cooling or freezing apparatus not covered by any other subclass
    • F25D2400/24—Protection against refrigerant explosions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2700/00—Means for sensing or measuring; Sensors therefor
    • F25D2700/02—Sensors detecting door opening

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)

Description

この発明は、例えば、炭化水素系又はこれに類する爆発の危険性を有する可燃性の冷媒を用いて冷却する冷蔵庫に関する。   The present invention relates to a refrigerator that is cooled using, for example, a hydrocarbon-based or similar flammable refrigerant having an explosion risk.

近年、冷蔵庫の冷媒には、オゾン層の破壊により地球環境を悪化させないために、フロン系の冷媒に代えて、炭化水素系の冷媒が使用されている。しかし、この炭化水素系の冷媒は可燃性であって、この冷媒が冷蔵庫内部に何らかの原因で漏れ出し、冷蔵庫内部にある電気的接点部から火花が発生した場合に、この冷媒が引火して爆発するおそれがある。   In recent years, hydrocarbon refrigerants have been used as refrigerator refrigerants in place of fluorocarbon refrigerants in order not to deteriorate the global environment due to the destruction of the ozone layer. However, this hydrocarbon-based refrigerant is flammable, and when this refrigerant leaks into the refrigerator for some reason and a spark is generated from the electrical contact part inside the refrigerator, this refrigerant ignites and explodes. There is a risk.

そこで、従来の冷蔵庫は、上記冷媒への引火・爆発を防止するために、上記電気的接点部を冷蔵庫外部に設置したり、上記電気的接点部自身に防爆対応をしていた（特開２０００−２７４９２８号公報：特許文献１参照）。具体的に述べると、電気部品と電気配線との接点部や、二つの電気配線を結合した電気配線結合部を、冷蔵庫外部に配置したり、カバー部材にて遮蔽していた。   Therefore, in the conventional refrigerator, in order to prevent ignition and explosion of the refrigerant, the electrical contact portion is installed outside the refrigerator, or the electrical contact portion itself is explosion-proof (Japanese Patent Laid-Open No. 2000). No. -274928: see Patent Document 1). More specifically, the contact portion between the electrical component and the electrical wiring and the electrical wiring coupling portion that couples the two electrical wirings are arranged outside the refrigerator or shielded by the cover member.

しかしながら、上記従来の冷蔵庫では、既存のフロン系冷蔵庫に対応しようとした場合、上記電気的接点部を冷蔵庫外部に設置したり、カバー部材を設ける必要があり、冷蔵庫の形状変更による金型費アップや、上記電気的接点部の防爆対応によるコストアップにつながっていた。
特開２０００−２７４９２８号公報（図６、図１０） However, in the conventional refrigerator, when it is intended to correspond to an existing chlorofluorocarbon refrigerator, it is necessary to install the electrical contact part outside the refrigerator or to provide a cover member, which increases the mold cost by changing the shape of the refrigerator. Moreover, it led to the cost increase by the explosion-proof correspondence of the said electrical contact part.
Japanese Patent Laid-Open No. 2000-294928 (FIGS. 6 and 10)

そこで、この発明の課題は、可燃性の冷媒が漏洩しても引火して爆発する危険性がなく、しかも、既存のドアスイッチ等の電気部品をそのまま用いることができて、製造コストを低減できる冷蔵庫を提供することにある。   Therefore, the problem of the present invention is that there is no risk of igniting and explosion even if a flammable refrigerant leaks, and electrical parts such as existing door switches can be used as they are, and the manufacturing cost can be reduced. To provide a refrigerator.

上記課題を解決するため、本発明の冷蔵庫は、
冷蔵庫本体と、
この冷蔵庫本体に設けられると共に可燃性の冷媒を用いる冷媒回路と、
上記冷蔵庫本体の内部に配置される電気的接点部と
を備え、
上記電気的接点部は、上記冷蔵庫本体のドアの開状態でＯＮ状態になって庫内灯を点灯する一方、上記ドアの閉状態でＯＦＦ状態になって庫内灯を消灯するドアスイッチの電気的接点部であり、
上記可燃性の冷媒は、エチレンであり、
上記電気的接点部に入力される電力が０Ｗを越えて２０Ｗ以下になるようにして、上記冷媒回路から上記冷媒が漏れてこの冷媒が上記電気的接点部の近傍に存在した状態で、上記電気的接点部に火花を発生させてもこの冷媒を着火しないようにしたことを特徴としている。 In order to solve the above problems, the refrigerator of the present invention is
The refrigerator body,
A refrigerant circuit that is provided in the refrigerator body and uses a flammable refrigerant,
An electrical contact portion disposed inside the refrigerator body,
The electrical contact portion is turned on when the door of the refrigerator body is open to turn on the interior lamp, while the door switch is turned off when the door is closed to turn off the interior lamp. Contact point,
The combustible refrigerant is ethylene,
As power input to the electrical contact portion is equal to or less than 20W beyond 0 W, and the refrigerant leaks from the refrigerant circuit in a state where the refrigerant is present in the vicinity of the electrical contact portion, the It is characterized in that the refrigerant is not ignited even if a spark is generated at the electrical contact portion .

本発明の冷蔵庫によれば、上記可燃性の冷媒は、エチレンであり、上記電気的接点部に入力される電力が０Ｗを越えて２０Ｗ以下になるようにして、上記冷媒回路から上記冷媒が漏れてこの冷媒が上記電気的接点部の近傍に存在してもこの冷媒を着火しないようにしたので、上記可燃性の冷媒が上記冷蔵庫本体の内部に漏れ出し、上記電気的接点部の通電を切り換える際に、上記可燃性の冷媒が引火して爆発することを防ぐことができる。 According to the refrigerator of the present invention, the combustible refrigerant is ethylene, and the refrigerant leaks from the refrigerant circuit so that the electric power input to the electrical contact portion exceeds 0 W and becomes 20 W or less. Since the refrigerant is not ignited even if the refrigerant is present in the vicinity of the electrical contact portion , the combustible refrigerant leaks into the refrigerator main body and switches the energization of the electrical contact portion. In this case, the flammable refrigerant can be prevented from igniting and exploding.

また、上記電気的接点部を従来のように冷蔵庫外部に配置しなくてもよく、上記電気的接点部を含む電気部品を既存の構成や配置のままで用いることができるので、製造コストを低減できる。 In addition, the electrical contact portion need not be arranged outside the refrigerator as in the prior art, and the electrical components including the electrical contact portion can be used with the existing configuration and arrangement, thereby reducing the manufacturing cost. I can .

また、上記ドアスイッチを従来のように冷蔵庫外部に配置しなくてもよく、上記ドアスイッチを既存の構成や配置のままで用いることができるので、製造コストを低減できる。 In addition , the door switch does not have to be disposed outside the refrigerator as in the prior art, and the door switch can be used with the existing configuration and arrangement, so that the manufacturing cost can be reduced.

また、上記ドアスイッチは、上記ドアの開状態でＯＮ状態になる一方、上記ドアの閉状態でＯＦＦ状態になるので、上記ドアスイッチの電気回路を簡単な構成にできる。 Further, since the door switch is turned on when the door is opened, and is turned off when the door is closed, the electrical circuit of the door switch can be simplified .

また、上記電気的接点部を上記可燃性の冷媒（エチレン）下に直接に開放した最悪条件においても、上記可燃性の冷媒の着火を確実に防止できる。すなわち、電力が２０Ｗを越えると、上記可燃性の冷媒が引火して爆発する危険性がある。 Further , even in the worst condition in which the electrical contact portion is opened directly under the combustible refrigerant (ethylene), ignition of the combustible refrigerant can be reliably prevented. That is, when the electric power exceeds 20 W, there is a risk that the combustible refrigerant ignites and explodes.

また、一実施形態の冷蔵庫では、
冷蔵庫本体と、
この冷蔵庫本体に設けられると共に可燃性の冷媒を用いる冷媒回路と、
上記冷蔵庫本体の内部に配置される電気的接点部と
を備え、
上記電気的接点部は、上記冷蔵庫本体のドアの開状態でＯＮ状態になって庫内灯を点灯する一方、上記ドアの閉状態でＯＦＦ状態になって庫内灯を消灯するドアスイッチの電気的接点部であり、
上記可燃性の冷媒は、イソブタンであり、
上記電気的接点部に印加される電圧が１００Ｖから２４０Ｖの範囲で、かつ、上記電気的接点部に入力される電力が０Ｗを越えて３０Ｗ以下になるようにして、上記冷媒回路から上記冷媒が漏れてこの冷媒が上記電気的接点部の近傍に存在した状態で、上記電気的接点部に火花を発生させてもこの冷媒を着火しないようにした。
Moreover, in the refrigerator of one embodiment,
The refrigerator body,
A refrigerant circuit that is provided in the refrigerator body and uses a flammable refrigerant,
An electrical contact portion disposed inside the refrigerator body,
The electrical contact portion is turned on when the door of the refrigerator body is open to turn on the interior lamp, while the door switch is turned off when the door is closed to turn off the interior lamp. Contact point,
The combustible refrigerant is isobutane,
The refrigerant is supplied from the refrigerant circuit so that the voltage applied to the electrical contact portion is in the range of 100V to 240V, and the power input to the electrical contact portion is greater than 0W to 30W or less. In a state where the refrigerant leaked and was present in the vicinity of the electrical contact portion, the refrigerant was not ignited even if a spark was generated at the electrical contact portion .

この一実施形態の冷蔵庫によれば、上記可燃性の冷媒は、イソブタンであり、上記電気的接点部に印加される電圧が１００Ｖから２４０Ｖの範囲で、かつ、上記電気的接点部に入力される電力が０Ｗを越えて３０Ｗ以下になるようにして、上記冷媒回路から上記冷媒が漏れてこの冷媒が上記電気的接点部の近傍に存在してもこの冷媒を着火しないようにしたので、上記可燃性の冷媒が上記冷蔵庫本体の内部に漏れ出し、上記電気的接点部の通電を切り換える際に、上記可燃性の冷媒が引火して爆発することを防ぐことができる。According to the refrigerator of this embodiment, the combustible refrigerant is isobutane, and the voltage applied to the electrical contact portion is in the range of 100 V to 240 V, and is input to the electrical contact portion. Since the electric power exceeds 0 W and becomes 30 W or less, the refrigerant leaks from the refrigerant circuit so that the refrigerant does not ignite even if the refrigerant exists in the vicinity of the electrical contact portion. It is possible to prevent the combustible refrigerant from igniting and exploding when the conductive refrigerant leaks into the refrigerator main body and switches the energization of the electrical contact portion.

また、上記電気的接点部を従来のように冷蔵庫外部に配置しなくてもよく、上記電気的接点部を含む電気部品を既存の構成や配置のままで用いることができるので、製造コストを低減できる。In addition, the electrical contact portion need not be arranged outside the refrigerator as in the prior art, and the electrical components including the electrical contact portion can be used with the existing configuration and arrangement, thereby reducing the manufacturing cost. it can.

また、上記ドアスイッチを従来のように冷蔵庫外部に配置しなくてもよく、上記ドアスイッチを既存の構成や配置のままで用いることができるので、製造コストを低減できる。In addition, the door switch does not have to be disposed outside the refrigerator as in the prior art, and the door switch can be used with the existing configuration and arrangement, so that the manufacturing cost can be reduced.

また、上記ドアスイッチは、上記ドアの開状態でＯＮ状態になる一方、上記ドアの閉状態でＯＦＦ状態になるので、上記ドアスイッチの電気回路を簡単な構成にできる。Further, since the door switch is turned on when the door is opened, and is turned off when the door is closed, the electrical circuit of the door switch can be simplified.

また、上記電気的接点部を上記可燃性の冷媒（イソブタン）下に直接に開放した最悪条件においても、上記可燃性の冷媒の着火を確実に防止できる。すなわち、印加電圧が１００Ｖから２４０Ｖの範囲で、電力が３０Ｗを越えると、上記可燃性の冷媒が引火して爆発する危険性がある。 Moreover , ignition of the combustible refrigerant can be reliably prevented even under the worst condition in which the electrical contact portion is opened directly under the combustible refrigerant (isobutane). That is, when the applied voltage is in the range of 100 V to 240 V and the power exceeds 30 W, there is a risk that the flammable refrigerant will ignite and explode.

この発明の冷蔵庫によれば、上記可燃性の冷媒は、エチレンであり、上記電気的接点部に入力される電力が０Ｗを越えて２０Ｗ以下になるようにして、上記冷媒回路から上記冷媒が漏れてこの冷媒が上記電気的接点部の近傍に存在してもこの冷媒を着火しないようにしたので、上記可燃性の冷媒が漏洩しても引火して爆発する危険性がなく、しかも、既存のドアスイッチ等の電気部品をそのまま用いることができて、製造コストを低減できる。 According to the refrigerator of the present invention, the combustible refrigerant is ethylene, and the refrigerant leaks from the refrigerant circuit so that the electric power input to the electrical contact portion exceeds 0 W and becomes 20 W or less. Since the refrigerant is not ignited even if the refrigerant is present in the vicinity of the electrical contact portion, there is no risk of igniting and exploding even if the flammable refrigerant leaks. Electrical components such as door switches can be used as they are, and manufacturing costs can be reduced.

この発明の冷蔵庫によれば、上記可燃性の冷媒は、イソブタンであり、上記電気的接点部に印加される電圧が１００Ｖから２４０Ｖの範囲で、かつ、上記電気的接点部に入力される電力が０Ｗを越えて３０Ｗ以下になるようにして、上記冷媒回路から上記冷媒が漏れてこの冷媒が上記電気的接点部の近傍に存在してもこの冷媒を着火しないようにしたので、上記可燃性の冷媒が漏洩しても引火して爆発する危険性がなく、しかも、既存のドアスイッチ等の電気部品をそのまま用いることができて、製造コストを低減できる。According to the refrigerator of the present invention, the combustible refrigerant is isobutane, the voltage applied to the electrical contact portion is in the range of 100 V to 240 V, and the power input to the electrical contact portion is Since the refrigerant leaks from the refrigerant circuit so that the refrigerant does not ignite even if the refrigerant is present in the vicinity of the electrical contact portion, the refrigerant is not ignited. Even if the refrigerant leaks, there is no danger of being ignited and exploding, and electrical components such as existing door switches can be used as they are, and the manufacturing cost can be reduced.

以下、この発明を図示の実施の形態により詳細に説明する。   Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

（第１の実施形態）
図１は、本発明の冷蔵庫の一実施形態である背面側からみた簡略斜視図を示している。この冷蔵庫は、可燃性の冷媒を用いて冷却するものであって、開閉可能なドア２１ａを有する冷蔵庫本体２１と、この冷蔵庫本体２１の内部に配置されるドアスイッチ４および庫内灯（照明灯）５と、サーモスタット３と、圧縮機２と、１００Ｖ電源１とを備える。 (First embodiment)
FIG. 1: has shown the simple perspective view seen from the back side which is one Embodiment of the refrigerator of this invention. This refrigerator is cooled using a combustible refrigerant, and has a refrigerator main body 21 having an openable door 21a, a door switch 4 disposed inside the refrigerator main body 21, and an interior lamp (illumination lamp). ) 5, thermostat 3, compressor 2, and 100 V power source 1.

図１と図２に示すように、上記圧縮機２は、上記冷蔵庫本体２１に設けられる図示しない蒸発器、凝縮器および絞り構造（膨張手段）等と共に、冷媒回路２２（冷凍サイクル）を構成し、上記可燃性の冷媒にて上記冷蔵庫本体２１内部を冷却する。上記圧縮機２には、この圧縮機２の始動を補助する始動リレー６と、過電流が流れた場合にこの圧縮機２の接点部を切るプロテクタ７とが接続される。   As shown in FIGS. 1 and 2, the compressor 2 constitutes a refrigerant circuit 22 (refrigeration cycle) together with an evaporator, a condenser, a throttle structure (expansion means) and the like (not shown) provided in the refrigerator main body 21. The inside of the refrigerator main body 21 is cooled with the combustible refrigerant. Connected to the compressor 2 are a start relay 6 that assists the start of the compressor 2 and a protector 7 that cuts the contact portion of the compressor 2 when an overcurrent flows.

上記サーモスタット３は、上記冷蔵庫本体２１の内部温度を感知し、この内部温度が高い場合に、上記サーモスタット３の接点部をつなげ、上記圧縮機２を駆動させて、上記冷蔵庫本体２１内部を冷却する。   The thermostat 3 senses the internal temperature of the refrigerator main body 21, and when the internal temperature is high, the thermostat 3 connects the contact portions of the thermostat 3 to drive the compressor 2 to cool the inside of the refrigerator main body 21. .

上記ドアスイッチ４は、庫内灯点灯用のメカ式ドアスイッチであり、上記ドア２１ａの開閉にあわせて上記庫内灯５を点灯しかつ消灯するものである。具体的に述べると、上記ドアスイッチ４は、電気的接点部４ａを有し、上記ドア２１ａの開状態で上記電気的接点部４ａをＯＮ状態にして上記庫内灯５を点灯し、上記ドア２１ａの閉状態で上記電気的接点部４ａをＯＦＦ状態にして上記庫内灯５を消灯する。   The door switch 4 is a mechanical door switch for lighting the interior lamp, and turns on and off the interior lamp 5 in accordance with the opening and closing of the door 21a. More specifically, the door switch 4 has an electrical contact portion 4a. When the door 21a is open, the electrical contact portion 4a is turned on to turn on the interior lamp 5, and the door switch 4 is turned on. In the closed state of 21a, the electrical contact portion 4a is turned off to turn off the interior lamp 5.

上記電力制御手段２０は、可変抵抗を有し、上記ドアスイッチ４の上記電気的接点部４ａに直列に接続され、上記冷媒回路２２から上記冷媒が漏れてこの冷媒が上記電気的接点部４ａの近傍に存在してもこの冷媒を着火しない程度に上記電気的接点部４ａに流れる電力を制御する。具体的には、上記可燃性の冷媒が、エチレンであるとき、上記電力制御手段２０は、上記電気的接点部４ａに入力される電力が２０Ｗ以下になるように制御する。なお、上記電力制御手段２０は、図示しないが、上記ドアスイッチ４に予め一体に組み込まれた抵抗であってもよい。   The electric power control means 20 has a variable resistance and is connected in series to the electrical contact portion 4a of the door switch 4. The refrigerant leaks from the refrigerant circuit 22, and the refrigerant flows into the electrical contact portion 4a. The electric power flowing through the electrical contact portion 4a is controlled to such an extent that the refrigerant is not ignited even if it exists in the vicinity. Specifically, when the combustible refrigerant is ethylene, the power control means 20 controls the power input to the electrical contact portion 4a to be 20 W or less. The power control means 20 may be a resistor integrated in advance with the door switch 4 although not shown.

上記構成の冷蔵庫によれば、上記冷蔵庫本体２１内部で上記可燃性の冷媒漏れが発生してこの可燃性の冷媒の濃度が可燃域達している場合に、上記ドア２１ａを開けて、上記電気的接点部４ａをＯＦＦ状態からＯＮ状態につなげても、上記可燃性の冷媒が引火して爆発することがなく、安全性に優れたものになる。   According to the refrigerator having the above configuration, when the flammable refrigerant leaks inside the refrigerator main body 21 and the concentration of the flammable refrigerant reaches the flammable region, the door 21a is opened and the electric Even if the contact part 4a is connected from the OFF state to the ON state, the combustible refrigerant does not ignite and explode, and the safety is excellent.

次に、上記可燃性冷媒の上記ドアスイッチによる着火試験を説明する。   Next, an ignition test of the combustible refrigerant by the door switch will be described.

図３に、着火試験装置１１を示し、この着火試験装置１１は、内径２９６ｍｍ厚さ７ｍｍのアクリル製の円筒８と、この円筒８の下方開口部を施蓋する鉄製の円板９と、上記円筒８の上方開口部を施蓋する薄いラップ１０とを備える。このラップ１０は、上記円筒８内部に封入した上記可燃性冷媒が着火したときに破れる構造としている。   FIG. 3 shows an ignition test apparatus 11, which includes an acrylic cylinder 8 having an inner diameter of 296 mm and a thickness of 7 mm, an iron disk 9 that covers the lower opening of the cylinder 8, and the above-mentioned And a thin wrap 10 that covers the upper opening of the cylinder 8. The wrap 10 is configured to be broken when the combustible refrigerant sealed in the cylinder 8 is ignited.

そして、図４に示すように、上記着火試験装置１１内に、上記可燃性冷媒を封入し、かつ、上記ドアスイッチ４を入れる。このドアスイッチ４の電気的接点部４ａは、１００Ｖ電源１、抵抗負荷１２および電流計１３と共に、閉ループの電気回路を構成する。上記抵抗負荷１２は、上記電気的接点部４ａに、設定した所定値の電流を流すものである。上記電流計１３は、上記電気的接点部４ａに流れる電流値を検出するものである。   And as shown in FIG. 4, the said combustible refrigerant | coolant is enclosed in the said ignition test apparatus 11, and the said door switch 4 is put in. The electrical contact portion 4a of the door switch 4 constitutes a closed loop electric circuit together with the 100V power source 1, the resistance load 12, and the ammeter 13. The resistance load 12 allows a predetermined current to flow through the electrical contact portion 4a. The ammeter 13 detects a current value flowing through the electrical contact portion 4a.

そして、上記ドアスイッチ４を動かし、上記電気的接点部４ａに火花を発生させて、上記可燃性冷媒の着火試験を実施した。このとき、上記抵抗負荷１２にて電流値を変えながら、電流計１３にて試験時の電流値を確認した。この試験結果を以下の表１に示す。なお、この試験条件は国際基準のＩＥＣ６００７９−１５規格基づいており、具体的には６．５％±０．５％のエチレンガス濃度で試験ガスを３回入れ替え実施した。   And the said door switch 4 was moved, the spark was generated in the said electrical contact part 4a, and the ignition test of the said combustible refrigerant | coolant was implemented. At this time, the current value during the test was confirmed with an ammeter 13 while changing the current value with the resistance load 12. The test results are shown in Table 1 below. The test conditions were based on the international standard IEC 60079-15. Specifically, the test gas was changed three times at an ethylene gas concentration of 6.5% ± 0.5%.

［表１］

Figure 0003723811
[Table 1]
Figure 0003723811

上記表１からわかるように、上記可燃性の冷媒が、エチレンであるとき、上記電気的接点部４ａに入力される電力が２０Ｗ以下のときは、上記可燃性冷媒が引火することがなく安全であり、上記電気的接点部４ａに入力される電力が２０Ｗを越えると、上記可燃性冷媒が引火して危険である。   As can be seen from Table 1 above, when the flammable refrigerant is ethylene, when the electric power input to the electrical contact portion 4a is 20 W or less, the flammable refrigerant does not ignite and is safe. If the electric power input to the electrical contact part 4a exceeds 20 W, the combustible refrigerant is ignited and dangerous.

ここで、図５（Ａ）の正面図、図５（Ｂ）の右側面図に、上記ドアスイッチ４の一例を示す。このドアスイッチ４は、リブ１４と、図示しない庫内灯とつながる端子１５とを備え、このリブ１４を押して短縮させることにより、図示しない上記電気的接点部が切れて上記庫内灯が消灯し、上記リブ１４を離して伸長させることにより、上記電気的接点部がつながり上記庫内灯が点灯する。また、上記電気的接点部は、上記ドアスイッチ４の樹脂製の本体ケースに覆われており、上記エチレンガスが侵入されにくい構造となっている。しかし、上記着火試験では、さらに最悪条件を設定するために、上記本体ケースを取り除いて、上記電気的接点部を上記エチレンガス下の大気開放にした状態で、電圧１００Ｖで電流０．２Ａの電力２０Ｗを上記電気的接点部に流して試験を実施したが、上記エチレンガスの引火は無く安全性が確認出来た。   Here, an example of the door switch 4 is shown in the front view of FIG. 5A and the right side view of FIG. The door switch 4 includes a rib 14 and a terminal 15 connected to an interior lamp (not shown). By pressing and shortening the rib 14, the electrical contact portion (not shown) is cut and the interior lamp is turned off. When the rib 14 is separated and extended, the electrical contact portion is connected to light the interior lamp. The electrical contact portion is covered with a resin main body case of the door switch 4 and has a structure in which the ethylene gas is difficult to enter. However, in the ignition test, in order to set the worst condition further, the main body case is removed, and the electric contact portion is opened to the atmosphere under the ethylene gas, and the power is 0.2V at 100V. Although the test was conducted with 20 W flowing through the electrical contact portion, the ethylene gas was not ignited and the safety could be confirmed.

なお、上記着火試験に用いたドアスイッチ４とは、上記電気的接点部に上記エチレンガスが侵入する構造のものであって、国際基準のＩＥＣ６００７９−１５規格のシール試験にて不合格となるレベルのもので、図５に示すドアスイッチ４は不合格となる。   The door switch 4 used in the ignition test has a structure in which the ethylene gas penetrates into the electrical contact portion, and is a level that fails the international standard IEC 60079-15 standard seal test. Therefore, the door switch 4 shown in FIG.

ここで、図６にこのシール試験の概要を示す。すなわち、室温２５℃に放置した電気部品（ドアスイッチ）１７を、５０℃の湯１８の入ったビーカー１６に、水面より深さ２５ｍｍの所に1分間沈める。この時、泡が発生すれば、不合格となる。   Here, FIG. 6 shows an outline of this seal test. That is, the electrical component (door switch) 17 left at a room temperature of 25 ° C. is submerged in a beaker 16 containing hot water 18 at 50 ° C. at a depth of 25 mm from the water surface for 1 minute. At this time, if bubbles are generated, it is rejected.

（第２の実施形態）
次に、上記可燃性の冷媒として、イソブタンを用いたとき、上記ドアスイッチによる着火試験の結果を、以下の表２に示す。 (Second Embodiment)
Next, when isobutane is used as the flammable refrigerant, the results of the ignition test using the door switch are shown in Table 2 below.

すなわち、この試験条件は、国際基準のＩＥＣ６００７９−１５規格基づいたＪＥＭＡの自主基準で実施しており、具体的には、３．２％±０．５％のイソブタン（Ｒ６００ａ）ガス濃度で試験ガスを３回入れ替え実施した。なお、その他の条件は、上記第１の実施形態と同じであるので、説明を省略する。   In other words, this test condition is carried out in accordance with JEMA's voluntary standard based on the international standard IEC 60079-15. Specifically, the test gas has an isobutane (R600a) gas concentration of 3.2% ± 0.5%. Was carried out three times. Since other conditions are the same as those in the first embodiment, description thereof is omitted.

［表２］

Figure 0003723811
[Table 2]

Figure 0003723811

上記表２からわかるように、上記可燃性の冷媒が、イソブタンであるとき、上記電気的接点部４ａに印加される電圧が１００Ｖから２４０Ｖの範囲で、かつ、上記電気的接点部４ａに入力される電力が３０Ｗ以下のときは、上記可燃性冷媒が引火することがなく安全であり、上記電気的接点部４ａに印加される電圧が１００Ｖから２４０Ｖの範囲で、上記電気的接点部４ａに入力される電力が３０Ｗを越えると、上記可燃性冷媒が引火して危険である。   As can be seen from Table 2, when the flammable refrigerant is isobutane, the voltage applied to the electrical contact portion 4a is in the range of 100V to 240V and is input to the electrical contact portion 4a. When the electric power is 30 W or less, the flammable refrigerant is safe without igniting, and the voltage applied to the electrical contact portion 4a is within the range of 100V to 240V and is input to the electrical contact portion 4a. If the electric power exceeds 30 W, the combustible refrigerant ignites and is dangerous.

本発明の冷蔵庫の一実施形態を示す背面側からみた簡略斜視図である。It is the simple perspective view seen from the back side which shows one embodiment of the refrigerator of the present invention. 配線図である。It is a wiring diagram. 着火試験装置を示す斜視図である。It is a perspective view which shows an ignition test apparatus. 着火試験での電気回路を示す配線図である。It is a wiring diagram which shows the electric circuit in an ignition test. ドアスイッチを示す構成図である。It is a block diagram which shows a door switch. シール試験を示す説明図である。It is explanatory drawing which shows a seal test.

符号の説明Explanation of symbols

４ ドアスイッチ
４ａ 電気的接点部
２０ 電力制御手段
２１ 冷蔵庫本体
２１ａ ドア
２２ 冷媒回路 4 door switch 4a electrical contact 20 power control means 21 refrigerator main body 21a door 22 refrigerant circuit

Claims (2)

冷蔵庫本体と、
この冷蔵庫本体に設けられると共に可燃性の冷媒を用いる冷媒回路と、
上記冷蔵庫本体の内部に配置される電気的接点部と
を備え、
上記電気的接点部は、上記冷蔵庫本体のドアの開状態でＯＮ状態になって庫内灯を点灯する一方、上記ドアの閉状態でＯＦＦ状態になって庫内灯を消灯するドアスイッチの電気的接点部であり、
上記可燃性の冷媒は、エチレンであり、
上記電気的接点部に入力される電力が０Ｗを越えて２０Ｗ以下になるようにして、上記冷媒回路から上記冷媒が漏れてこの冷媒が上記電気的接点部の近傍に存在した状態で、上記電気的接点部に火花を発生させてもこの冷媒を着火しないようにしたことを特徴とする冷蔵庫。 The refrigerator body,
A refrigerant circuit that is provided in the refrigerator body and uses a flammable refrigerant,
An electrical contact portion disposed inside the refrigerator body,
The electrical contact portion is turned on when the door of the refrigerator body is open to turn on the interior lamp, while the door switch is turned off when the door is closed to turn off the interior lamp. Contact point,
The combustible refrigerant is ethylene,
As power input to the electrical contact portion is equal to or less than 20W beyond 0 W, and the refrigerant leaks from the refrigerant circuit in a state where the refrigerant is present in the vicinity of the electrical contact portion, the A refrigerator characterized in that the refrigerant is not ignited even when a spark is generated at an electrical contact portion . 冷蔵庫本体と、
この冷蔵庫本体に設けられると共に可燃性の冷媒を用いる冷媒回路と、
上記冷蔵庫本体の内部に配置される電気的接点部と
を備え、
上記電気的接点部は、上記冷蔵庫本体のドアの開状態でＯＮ状態になって庫内灯を点灯する一方、上記ドアの閉状態でＯＦＦ状態になって庫内灯を消灯するドアスイッチの電気的接点部であり、
上記可燃性の冷媒は、イソブタンであり、
上記電気的接点部に印加される電圧が１００Ｖから２４０Ｖの範囲で、かつ、上記電気的接点部に入力される電力が０Ｗを越えて３０Ｗ以下になるようにして、上記冷媒回路から上記冷媒が漏れてこの冷媒が上記電気的接点部の近傍に存在した状態で、上記電気的接点部に火花を発生させてもこの冷媒を着火しないようにしたことを特徴とする冷蔵庫。 The refrigerator body,
A refrigerant circuit that is provided in the refrigerator body and uses a flammable refrigerant,
An electrical contact portion disposed inside the refrigerator body,
The electrical contact portion is turned on when the door of the refrigerator body is open to turn on the interior lamp, while the door switch is turned off when the door is closed to turn off the interior lamp. Contact point,
The combustible refrigerant is isobutane,
The refrigerant is supplied from the refrigerant circuit so that the voltage applied to the electrical contact portion is in the range of 100V to 240V, and the electric power input to the electrical contact portion is greater than 0W to 30W or less. A refrigerator characterized in that the refrigerant is not ignited even if a spark is generated in the electrical contact portion in a state where the refrigerant leaks and exists in the vicinity of the electrical contact portion .
JP2003423500A 2003-06-19 2003-12-19 refrigerator Expired - Fee Related JP3723811B2 (en)

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