JPS58101817A - Air conditioning device for automobile - Google Patents

Abstract

PURPOSE:To prevent an abnormal increase of overheat of refrigerant vapor, by detecting surface temperature of an outlet refrigerant pipe in an evaporator and selecting an internal and external air selector damper to the side of external air suction only at a high thermal load. CONSTITUTION:If a blower switch 17 and compressor switch 16 are turned ON, a controller 13 is operated by a signal of a sensor 14 provided in the downstream of an evaporator 4 to actuate an air conditioning device. Here a damper selecting suction of internal and external air opens an internal air inlet 19 generally by turning ON an internal and external air selector switch 18 and conducting an electric current in a solenoid 15. At this operation, if a temperature sensing unit 22a of a thermoswitch 22 senses, for instance, at least 20 deg.C for a high thermal load, the thermoswitch 22 is turned ON to conduct a current in a coil 21a of a relay 21 and turn OFF a contact 21b. As a result, conduction of a current in the solenoid 15 is cut off to select a damper 2 to a position as shown by a broken line, that is, to open an external air suction port 1b.

Description

【発明の詳細な説明】 本発明は自動車用空調装置に関し、特に内気収入および
外気吸入ができる自動車用空調装置において、熱負荷が
大きい時、コンプレッサ吸入冷媒温度が高くなって冷媒
蒸気の過熱度が異常に高くなるのを防止するようにした
ものである。従来、この釉の自動車用空調装置において
は、コンプレッサ吸入冷媒温度に関係なく、手動で内気
、外気吸入を選択する方法が提案されているのみで、コ
ンプレッサ吸入冷奴ｌｌ！度Ｖ（連ツ！１したも　・は
ない。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air conditioner for an automobile, and in particular, in an air conditioner for an automobile capable of drawing inside air and outside air, when the heat load is large, the temperature of the refrigerant sucked into the compressor increases and the degree of superheating of the refrigerant vapor decreases. This is to prevent the temperature from becoming abnormally high. Conventionally, in this glazed automobile air conditioner, the only method proposed was to manually select between indoor air and outdoor air intake regardless of the compressor intake refrigerant temperature. Degree V (Continuous! 1, but there is no.

例えば、第１図に示すような通風ダクト１に、内気吸入
口１ａおよび外気吸入口１ｂの切替を行う内外気切替ダ
ンパー　２、送風ファン３、冷凍サイクルのエバポレー
タ４、工／ジン冷却水を熱源とするヒータコア５、該ヒ
ータコア５の前に設けられた温度調節用エアミックスド
ア７およびクーラ吹出口１ｃおよびヒータ吹中口１ｄの
選択をす仝ドア８を備えた自動車用空調装置においては
、内外気切替ドア２の開閉を行うために、′ｆｋＬｌｉ
Ｉｉソレノイドあるいは負圧アクチュエータ１５を内外
気切替スイッチ１８の手動操作によって作動させていた
。For example, a ventilation duct 1 as shown in FIG. 1 includes an inside/outside air switching damper 2 that switches between an inside air inlet 1a and an outside air inlet 1b, a blower fan 3, an evaporator 4 of a refrigeration cycle, and a cooling water source as a heat source. In an automobile air conditioner equipped with a heater core 5, a temperature adjusting air mix door 7 provided in front of the heater core 5, a cooler outlet 1c, and a heater outlet 1d, a door 8 is provided. In order to open and close the air switching door 2, 'fkLli
The Ii solenoid or negative pressure actuator 15 was operated by manual operation of the inside/outside air changeover switch 18.

しかし、上記構成のような自動車用空調装置においては
、内気と外気の切替ダンパー２が手動式で自由に操作で
きるものの、何回も操作することは安全運転上問題があ
るし、高負荷時、コンプレッサの吸入冷媒温度が高くな
シ、すなわち、冷媒の過熱度も高くなり、コンゾレツサ
吐出冷媒温度も高くなって故障が発生しやすぐなるなど
問題である。この点に間接的に対処するものとして、家
内温度が設定値以上のときのみ内外気切替ダンパを外気
式にするとか、車室温度が外気温度よシも高いとき強制
的に内外気切替Ｐアを外気式に操作するものがあるが、
これらの方法では負荷の高い時に間接作動であるので、
コンプレッサを適確に保鋤するには致らなかった。However, in the automotive air conditioner having the above configuration, although the internal air/outside air switching damper 2 can be operated freely manually, operating it many times poses a problem in terms of safe driving, and when the load is high, The problem is that the temperature of the refrigerant sucked into the compressor is high, that is, the degree of superheating of the refrigerant is also high, and the temperature of the refrigerant discharged from the compressor is also high, making failure more likely. To address this issue indirectly, you can set the inside/outside air switching damper to the outside air type only when the indoor temperature is above a set value, or force the inside/outside air switching damper to be set to the outside air type when the cabin temperature is higher than the outside air temperature. There are some that operate using outside air.
These methods require indirect operation when the load is high, so
It was not possible to properly protect the compressor.

本発明は上記欠点に鑑みてなされたもの゛で、エバポレ
ータの出口冷媒配管表面温度の信号によシ、内外気切替
ダンパーを自動的に作動できるように構成することによ
シ、内気負荷の大きい時には外気吸入にして負荷を軽減
するので、コンプレッサの吸入冷媒温度があまシ高くな
らず、したがってコンプレッサ吐出冷媒温度の上昇も小
さくなシ、トラブルが発生しにくくなシ、かつ車室内の
クールダウンも内気時よりもよくすることができる自動
車用空調装置を提供する゛ことを目的とするものである
。The present invention has been made in view of the above-mentioned drawbacks, and by configuring the inside/outside air switching damper to be automatically activated in response to a signal of the surface temperature of the outlet refrigerant pipe of the evaporator, it is possible to avoid a large inside air load. Since the load is sometimes reduced by drawing in outside air, the temperature of the refrigerant sucked into the compressor does not rise too much, and therefore the rise in the temperature of the refrigerant discharged from the compressor is small, making trouble less likely to occur, and cooling down the inside of the vehicle. The object of the present invention is to provide an air conditioning system for an automobile that can operate the air conditioner better than when the air is indoors.

以下本発明を図に示す実施例について説明する０第２図
に示す自動車用空調装置において、通風ダクト１６吸入
側に内気吸入口１ａおよ゛ト外気吸入ロ１ｂを吹出側に
、クーラ吹出口１Ｃおよびヒータ吹出口１ｄを有すると
共に、内部には内気吸入口１ａと外気吸入口１ｂを切替
える内外気切替ダンパー２、送風をおこなうモータ駆動
の送風ファン３、−そしてエバポレータ４、コンプレッ
サ９、コンデンサ１０、レシーバ１１、膨張−７ｆ１２
で構成される冷凍サイクルのエバポレータ４と、エンジ
ン冷却水を熱源とするヒータコア５と、これらのエバポ
レータ４とヒータコア５の中間に設けられた温度調節用
エアミックスドア７を具備している０そして、温度調節
用エアミックスドア７は、その回動によってヒータコア
５を過つ丸味ノ戦、とヒータコア５の側部に位置するバ
イパス通ｗＩ６を通過する冷風を適当な温屓にエアミッ
クスして、吹出口をきめるドア８によシ、クー２吹出口
ＩＣ％あるいはヒータ吹出口１ｄから吹出される一電源
１９は、コンプレッサスイッチ１６を介してフロスト防
止のためコンブ、レツサをオン、オフする制御装置１ｒ
、１３に接続され、温度あるいは圧力を検出するセンサ
１４の検出信号に応じてコンプレッサ９をオン、オフす
る。また送風機ファン３のオン、オフスイッチ１７によ
シフアン３をオン、オフすることができる。以上の構成
については第１図に示す従来の自動車用空調装置と同様
であるが、さらに第２図に示すように内外気切替ダンパ
ー２の駆動用電磁ソレノイド１５をエバポレータ４の出
口低圧配管温度を感知して作動させるために、リレー２
１およびサーモスイッチ２２を使用する０リレー２１は
そのコイル２１ａに通電されると常閉接点２１ｂがオフ
し、サーモスイッチ２２はエバポレータ４の出口低圧配
管に設けた感温部２２ａの温度が設定値例えは２０℃よ
シ高い時にオンするように構成されている。Embodiments of the present invention shown in the drawings will be described below. In the automobile air conditioner shown in FIG. 1C and a heater outlet 1d, and includes an inside/outside air switching damper 2 for switching between an inside air intake port 1a and an outside air intake port 1b, a motor-driven ventilation fan 3 for blowing air, an evaporator 4, a compressor 9, and a condenser 10. , receiver 11, expansion -7f12
A refrigeration cycle evaporator 4 consisting of a refrigeration cycle evaporator 4, a heater core 5 using engine cooling water as a heat source, and a temperature adjustment air mix door 7 provided between the evaporator 4 and the heater core 5. The air mix door 7 for temperature adjustment mixes the cold air passing through the heater core 5 and the bypass passage 6 located on the side of the heater core 5 to an appropriate temperature by its rotation. A power supply 19, which is blown out from the door 8 that determines the exit, and from the cooler 2 outlet IC% or the heater outlet 1d, is connected to a control device 1r that turns on and off the kelp and resser to prevent frosting via the compressor switch 16.
, 13, and turns the compressor 9 on and off in response to a detection signal from a sensor 14 that detects temperature or pressure. Further, the air blower fan 3 can be turned on and off using the on/off switch 17 of the blower fan 3. The above configuration is the same as the conventional automobile air conditioner shown in FIG. 1, but as shown in FIG. Relay 2 to sense and activate
1 and 0 relay 21 using thermo switch 22 turns off the normally closed contact 21b when the coil 21a is energized, and the thermo switch 22 indicates that the temperature of the temperature sensing part 22a provided at the outlet low pressure pipe of the evaporator 4 is set to the set value. For example, it is configured to turn on when the temperature is higher than 20°C.

上記構成のものにおいて作動を説明すると、送風スイッ
チ１７をオンしコンプレッサスイッチ１６をオンすると
制御装置１３がセンサ１４の信号によって作動して空調
装置を作動する。ここで内外気スイッチ１８をオフすれ
ば電磁ソレノイド　　Δ１５への通電が遮断され、外気
吸入口１ｂを開くようにドア２がＷ線位置に切替えられ
乙か、一般的には内外気スイッチ１８をオンして電磁ソ
レノイド１５に通電し、ドア２を実線位＊　ｅｃ　９ｔ
Ｒ，引し、内気吸入をとる。しかし、熱負荷が高くてサ
ーモスイッチ２２の感温部２２ａが２０℃以上を感知す
るとサーモスイッチ２２はオンしてリレー２１のコイル
２１．−に通電され□、接点２１ｂがオフするので１、
磁ソレノイド１５への通電が遮断され、内外気切替ダン
パー２が図示しないスプリングの力で破線位置に移動し
、外気吸入口１ｂを開く。The operation of the above configuration will be described. When the blower switch 17 is turned on and the compressor switch 16 is turned on, the control device 13 is activated by a signal from the sensor 14 to operate the air conditioner. If the inside/outside air switch 18 is turned off, the power to the electromagnetic solenoid Δ15 is cut off, and the door 2 is switched to the W line position so as to open the outside air intake port 1b. energizes the electromagnetic solenoid 15 and moves the door 2 to the solid line position * ec 9t
R, pull, take internal air inhalation. However, when the heat load is high and the temperature sensing portion 22a of the thermoswitch 22 detects a temperature of 20°C or higher, the thermoswitch 22 is turned on and the coil 21 of the relay 21 is turned on. - is energized □, contact 21b is turned off, so 1,
The power supply to the magnetic solenoid 15 is cut off, and the inside/outside air switching damper 2 moves to the position indicated by the broken line by the force of a spring (not shown), opening the outside air intake port 1b.

上述のように本発ｉによれば、自動車用空調装置のエバ
ポレータの出口配管温度を検知して、熱負荷の高い時の
み外気吸入にすることにより、熱負荷の軽減がはかれ、
コンプレッサ吸入冷媒温度が＾くなることによる、コン
プレッサ吐出冷媒の異層な高温を防止し、コンプレッサ
その他の故障を最少限にくいとめることができるという
すぐれた効果がある。As mentioned above, according to the present invention, the temperature of the outlet pipe of the evaporator of the automobile air conditioner is detected and the outside air is sucked in only when the heat load is high, thereby reducing the heat load.
This has the excellent effect of preventing the refrigerant discharged from the compressor from becoming extremely high due to the temperature of the refrigerant sucked into the compressor becoming lower, thereby minimizing failures of the compressor and other components.

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

第１図は従来の自動車用空調装置の模式図、第２図は本
発明の実施例である自動車用空調装置の模式図である。 １ａ・・・内気吸入口、１ｂ・・・外気吸入口、２・・
・内外気切替ダンパー、４・・・エバポレータ、１８・
・・内外気スイッチ、２２・・・エバポレータの低圧側
配管に設けたサーモスイッチ、２２ａ・・・感温部。 代理人　浅　村　　　皓 外４４ 牙１図FIG. 1 is a schematic diagram of a conventional automobile air conditioner, and FIG. 2 is a schematic diagram of an automobile air conditioner according to an embodiment of the present invention. 1a... Inside air intake port, 1b... Outside air intake port, 2...
・Inside/outside air switching damper, 4...Evaporator, 18・
...Inside and outside air switch, 22...Thermo switch provided on the low pressure side piping of the evaporator, 22a...Temperature sensing part. Agent Asamura Kōgai 44 Fang 1

Claims (1)

【特許請求の範囲】[Claims] 内外気切替ダンパーにより、内気吸入および外気吸入を
切替えるように構成した自動車用空！ｉＭ１装−におい
て、エバポレータの出口低圧配管表面温度を検知する検
知器と、この検出赫の検知温度か設定値より高い時に内
気吸入を外気吸入に自動的に切替える電気制御機構とを
具備することを特徴とする自動車用空調装置。An air vent for automobiles configured to switch between inside air intake and outside air intake using an inside/outside air switching damper! The iM1 equipment is equipped with a detector that detects the surface temperature of the low-pressure piping at the outlet of the evaporator, and an electric control mechanism that automatically switches internal air intake to outside air intake when the detected temperature of the evaporator is higher than a set value. Features of automotive air conditioning equipment.