JPS5989973A - Refrigerator - Google Patents

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【発明の詳細な説明】 （イ）分野 本発明は蒸発器における冷媒蒸発温度を０℃以下となす
冷凍装置に関する。DETAILED DESCRIPTION OF THE INVENTION (A) Field The present invention relates to a refrigeration system that keeps the refrigerant evaporation temperature in an evaporator below 0°C.

（ロ）背景技術及びその問題点 膨張弁等の減圧装置からの低圧液冷媒をプレートフィン
形蒸発器に分流供給する分流器と、前記蒸発器に伺鳥し
た氷霜を除霜時に融解する除霜用ヒータ等の加熱源とを
備えた冷凍装置において、分流器は一般に冷気に晒され
る前記蒸発器の一方の管板側に減圧装置、加熱源の発熱
を停止させる高温復帰サーモスイッチと共に配置され、
又、分流器を通過する低圧液冷媒は０℃以下に維持され
ているために、冷気に含まれている水分が露として分流
器に付着し、次に凍結して氷霜となる。この氷霜は除霜
運転時、加熱源により昇温する蒸発器周囲の雰囲気温度
によって若干解けるが、雰囲気温度丈では氷霜が残存し
たま〜冷却運転に切り替わってしまい、冷却、除霜両運
転の繰り返しによって氷霜がろしく成長して管板を押圧
し分流管を破損させる事態を招いた。(b) Background art and its problems A flow divider that supplies low-pressure liquid refrigerant from a pressure reducing device such as an expansion valve to a plate-fin type evaporator in a divided manner, and a dewatering device that melts ice and frost that has visited the evaporator during defrosting. In a refrigeration system equipped with a heating source such as a frost heater, a flow divider is generally placed on one tube plate side of the evaporator that is exposed to cold air, together with a pressure reducing device and a high temperature return thermoswitch that stops the heating source from generating heat. ,
Further, since the low-pressure liquid refrigerant passing through the flow divider is maintained at 0° C. or lower, moisture contained in the cold air adheres to the flow divider as dew, and then freezes to form frost. During defrosting operation, this frost melts slightly due to the ambient temperature around the evaporator, which is raised by the heating source, but at ambient temperature, the ice frost remains and the operation switches to cooling operation, causing both cooling and defrosting operation to occur. As a result of this repetition, ice and frost grew rapidly, pressing against the tube sheet and causing damage to the flow pipe.

この事態を回避するために、本願発明者はコードヒータ
等９．可撓性電気ヒータを分流器に巻回して除霜時分流
器を直接加熱して分流器の氷霜を完全に融解除去させる
ことに成功したが、この加熱によって雰囲気温度が昇温
しすぎて高温復帰サーモスイッチが作動して除箱運転の
途中で加熱源の発熱が停止される新たな欠点が生じた。In order to avoid this situation, the inventor of the present application has developed a cord heater, etc.9. We succeeded in completely melting and removing the ice and frost on the shunt by wrapping a flexible electric heater around the shunt and directly heating the shunt during defrosting, but this heating caused the ambient temperature to rise too much. A new drawback occurred in that the high temperature return thermoswitch was activated and the heating source stopped generating heat during unboxing operation.

又、分流器への氷霜を防止する手段として分流器を断熱
部材で覆う手段が一般に知られているが、か匁る手段で
は冷媒洩れの検査の際に不便であるばかりか、！′ｒｆ
＋熱部材に透湿作用が生じると、氷霜の発生を招き、断
熱効果の低下をきたす欠点が生じていた。Furthermore, as a means to prevent ice from forming on the flow divider, it is generally known to cover the flow divider with a heat insulating material, but this method is not only inconvenient when inspecting for refrigerant leaks, but also! 'rf
+If moisture permeability occurs in the heat member, there has been a drawback that it causes the generation of ice and frost, resulting in a decrease in the heat insulation effect.

（ハ）本発明の目的 高温復帰サーモスイッチの誤動作を招くことなく分流器
に利殖した氷霜を除霜時間内に解′かすことにある。(c) An object of the present invention is to thaw the ice and frost that has grown on the flow divider within the defrosting time without causing malfunction of the high temperature return thermoswitch.

に）本発明の実施例 第１図に示す（１）は大型冷蔵庫の天壁に吊下され庫内
を冷却する冷凍装置の冷却ユニットで、金属製のケース
（２）内にプレートフィン形蒸発器（３）と、この蒸発
器で熱交換された冷気を強制循環させる送風機（４）と
を収納設置している。前記蒸発器は第２図及び第３図に
示す如く等間隔に並設された多数枚の板金製フィン（５
）と、このフィン群の左右両側に配置された金属製の左
右両管板％　（６１と、このフィン群及び両管板に貫通
直交しＵ字部（７Ａ）を管板（６）より外方に突出させ
る多数本の金属製冷媒導管（７）とにより構成されてい
る。（８）は複数の流路（９）を形成したオリフィス部
（８Ａ）と、一端を流路（９）に他端を冷媒導管に接続
された複数本の分流管（８Ｂ）とからなる金属製の分流
器で、冷却運転時膨張弁等の減圧装置（１■で減圧され
低圧液管（印からの低圧液冷媒を蒸発器（３）に分流供
給する。この分流器の中央即ち各分流管（８Ｂ）で囲ま
れるオリフィス部（８Ａ）の中心部にはオリフィス部自
身の体積を小さくし且つ後述する熱移送部相の一端を嵌
め込むための凹所（８Ｃ）が形成されでいる。（１カは
通電されるシーズヒータ等の除霜、ヒータで、各フィン
（５）及び両管板（６）に列状に形成された溝（１３）
に嵌合され、両端が冷媒導管（力に弾力的に係合するワ
イヤークリップ（１４〕にて押１１：されており、発熱
の殆んど生じないコールドエンド部（１２Ａ）及びモー
ルド部（１２Ｂ）は管板（６）に向けて対向配置されて
いる。2) Embodiment of the present invention (1) shown in Figure 1 is a cooling unit of a refrigeration system that is suspended from the top wall of a large refrigerator to cool the inside of the refrigerator. A ventilator (3) and a blower (4) for forced circulation of the cold air heat exchanged with the evaporator are installed. The evaporator has a large number of sheet metal fins (5 fins) arranged in parallel at equal intervals as shown in FIGS.
) and metal tube plates on both the left and right sides of this fin group. It is composed of a large number of metal refrigerant conduits (7) that protrude in the direction.The orifice part (8A) has a plurality of flow channels (9) formed therein, and one end is connected to the flow channels (9). A metal flow divider consisting of multiple flow divider pipes (8B) connected to the refrigerant conduit at the other end. During cooling operation, the pressure is reduced by a pressure reducing device such as an expansion valve (1 The liquid refrigerant is supplied in a divided manner to the evaporator (3).In the center of this divider, that is, in the center of the orifice part (8A) surrounded by each branch pipe (8B), the volume of the orifice part itself is reduced and a heat source, which will be described later, is provided. A recess (8C) is formed into which one end of the transfer part phase is fitted. (One is a defrost heater such as a sheathed heater that is energized, and each fin (5) and both tube plates (6) Grooves (13) formed in rows in
The cold end part (12A) and the mold part (12B) are fitted into the refrigerant conduit (cold end part (12A) and mold part (12B), both ends of which are pressed by wire clips (14) that elastically engage with force. ) are arranged facing the tube plate (6).

ａ５）は下部のＵ字部（７Ａ）又は゛青板（６）下部に
配置された高温復帰サーモスイッチで、管板（６）の温
度又は管板（６）周囲の雰囲気温度が予じめ設定された
温度に達すると除霜用ヒータ（１２）の通電を遮断する
。A5) is a high temperature return thermoswitch placed at the lower U-shaped part (7A) or the lower part of the blue plate (6), and the temperature of the tube plate (6) or the ambient temperature around the tube plate (6) is set in advance. When the set temperature is reached, the defrosting heater (12) is de-energized.

０６）は熱伝導良好な棒状の金属よりなる熱移送部材で
、その一端はクリップ（１イ）にて除霜用ヒータ（１２
）に押止され、他端は分流器（８）の凹所（８Ｃ）に嵌
合されている。06) is a heat transfer member made of rod-shaped metal with good heat conduction, and one end of it is attached to a defrosting heater (12) with a clip (1a).
), and the other end is fitted into the recess (8C) of the flow divider (8).

か匁る構成によれば、険相運転時蒸発器（３）の水和を
融解する除霜用ヒータ０２）の熱を熱移送部材０（ｉ）
でもって分流器（８）に徐々に伝ゼるため、分流器（８
）に付着した氷霜を融解することができると共に、この
氷■の融解を管板（６）周囲の雰囲気温度を急激に昇温
することなく行なえ、もって高温復帰サーモスイッチ０
９の誤動作を防Ｉにできる。又、熱移送部材（１６）の
一端は分流器（８）の凹所（８Ｃ）に嵌め込まれている
ため、冷却運転時には低圧液冷媒を分流することの脈動
に上る分流器（８）の振動防止が図れると共に、冷媒洩
れ検査時にはその点検作業が容易となる。According to the structure, the heat of the defrosting heater 02) that melts the hydration of the evaporator (3) during steep phase operation is transferred to the heat transfer member 0(i).
As a result, the current is gradually transmitted to the flow divider (8).
) can be melted, and this ice can be melted without rapidly increasing the ambient temperature around the tube plate (6).
9 malfunction can be prevented. In addition, since one end of the heat transfer member (16) is fitted into the recess (8C) of the flow divider (8), vibrations of the flow divider (8) caused by the pulsation of dividing the low-pressure liquid refrigerant during cooling operation are avoided. This can be prevented, and inspection work becomes easier when inspecting for refrigerant leaks.

（ホ）本発明の効果 蒸発器の氷霜を融解する除霜用ヒータの熱を熱移送部材
でもって、分流器に伝えることにより、高温復帰サーモ
スイッチの雰囲気温度を急激に上げることなく分流器の
氷霜を融解することができる。(e) Effects of the present invention By transmitting the heat of the defrosting heater that melts the ice and frost of the evaporator to the flow divider using the heat transfer member, the flow divider can be used without rapidly raising the ambient temperature of the high temperature return thermoswitch. Can melt ice and frost.

【図面の簡単な説明】[Brief explanation of the drawing]

図面は本発明冷凍装置の実施例を示し、第１図は冷却ユ
ニットの斜視図、第２図は要部斜視図、第３図は要部縦
断面図である。 （３）・・・蒸発器、　（５）・・・フィン、　（６）
・・・管板、（力・・・冷媒導管、　（８）・・・分流
器、　α０）・・・減圧装置、０の・・・除霜用ヒータ
、　０■・・・高温後Ｒ９−モ、ｘ、イッチ、　（１帽
・・熱移送部材。The drawings show an embodiment of the refrigeration system of the present invention; FIG. 1 is a perspective view of a cooling unit, FIG. 2 is a perspective view of a main part, and FIG. 3 is a longitudinal sectional view of a main part. (3)...Evaporator, (5)...Fin, (6)
...Tube plate, (force...refrigerant conduit, (8)...divider, α0)...pressure reducing device, 0...defrosting heater, 0■...R9- after high temperature Mo, x, itch, (1 hat... heat transfer member.

Claims (1)

【特許請求の範囲】[Claims] １、膨張弁等の減圧装置からの低圧液冷媒を蒸発器に分
流する分流器と、前記蒸発器に付着した氷霜を除霜時に
融解する除籍用ヒータとを備えた冷凍装置において、熱
伝導良好な熱移送部材の一端を除霜用ヒータに、他端を
分流器に夫々当接させてなる冷凍装置。1. In a refrigeration system equipped with a flow divider that diverts low-pressure liquid refrigerant from a pressure reducing device such as an expansion valve to an evaporator, and a removal heater that melts ice and frost adhering to the evaporator during defrosting, heat conduction is A refrigeration system in which one end of a good heat transfer member is brought into contact with a defrosting heater and the other end is brought into contact with a flow divider.