JP2820681B2

JP2820681B2 - Vehicle cooling system

Info

Publication number: JP2820681B2
Application number: JP61038638A
Authority: JP
Inventors: 正彦伊藤; 健一藤原
Original assignee: Denso Corp
Current assignee: Denso Corp
Priority date: 1985-09-17
Filing date: 1986-02-24
Publication date: 1998-11-05
Anticipated expiration: 2013-11-05
Also published as: JPS62149509A

Description

【発明の詳細な説明】〔産業上の利用分野〕本発明は、トラックの仮眠室等を駐車時（エンジン停
止時）にも良好に冷房し得る車両用冷房装置に関する。〔従来の技術〕従来、例えばエンジン停止中に、車室内を冷房するも
のとして実開昭58−58919号公報に開示されているもの
がある。このものは、エンジン運転時（冷凍サイクル運
転時）に、蓄冷式熱交換器（12、公報上の符号、以下同
じ）にて蓄冷を行い、この蓄冷式熱交換器（12）内にヒ
ートパイプ（15）の一端を挿入し、他端を車室内（仮眠
室）に露出させることで、このヒートパイプ（15）を介
して車室内（仮眠室）を冷房するものである。〔発明が解決しようとする問題点〕しかしながら、ヒートパイプ（15）は、蓄冷式熱交換
器（12）が蓄冷中車室内温度が高いと車室内の熱を蓄冷
式熱交換器（12）に移送して、常時車室内に冷気を運ん
でいる。すなわち、車室内温度が高ければ、蓄冷中であ
ってもヒートパイプによって蓄冷熱を車室内に常時放出
することになる。従って、蓄冷式熱交換器（12）の蓄冷
効率が悪く、充分な蓄冷を行うために必要以上の時間が
かかるという問題がある。また、これによって、乗員が休息（仮眠）したい時
に、蓄冷式熱交換器（12）に充分な蓄冷量が確保されて
おらず、充分な時間仮眠室を冷却できないという問題が
ある。そこで、本発明は上記の問題点に鑑み、乗員が仮眠室
を冷却したい時だけに、蓄冷材の蓄冷熱を車室内に放出
することができ、これによって蓄冷効率を向上させるこ
とができる車両用冷房装置を提供することを目的とす
る。〔問題点を解決するための手段〕本発明は、上記目的を達成するために、車両エンジンによって駆動される冷凍サイクルの第１
蒸発器（25）、この第１蒸発器（25）に向かって送風す
る第１送風機（26）、および前記第１蒸発器（25）で冷
却された冷風を車室内に吹き出すための第１吹出口（5
4）を有し、この第１吹出口（54）から車室内に前記冷
風を吹き出すことによって車室内を冷房するように設け
られた第１冷却ユニット（Ａ）と、前記冷凍サイクルに設けられた第２蒸発器（28）、前
記冷凍サイクルの運転時において前記第２蒸発器（28）
によって蓄冷可能なごとく構成された蓄冷材（29a）、
少なくとも前記第２蒸発器（28）と前記蓄冷材（29a）
とを収納し、空気の吸込口（62）および第２吹出口（6
4）が形成されたケース（60）、および前記吸込口（6
2）から前記第２吹出口（64）にかけて、前記蓄冷材（2
9a）に沿うようにして前記ケース（60）内に送風する第
２送風機（63）を有し、前記第２吹出口（64）から車室
内の所定区域に冷風を吹き出すことによって前記所定区
域を冷房するように設けられた第２冷却ユニット（Ｂ）
と、前記第２蒸発器（28）へ前記冷凍サイクルの冷媒を供
給する状態と供給しない状態とを切り換える弁（48）
と、前記第２蒸発器（28）への冷媒供給を指示する蓄冷開
始指示手段（４）と、前記第２送風機（63）の起動を指示する冷房開始指示
手段（68）と、前記蓄冷開始指示手段（４）からの信号に基づいて、
この蓄冷開始指示手段（４）が前記第２蒸発器（28）へ
の冷媒供給を指示したとき、前記第２蒸発器（28）へ前
記冷凍サイクルの冷媒を供給するように前記弁（48）を
制御して前記蓄冷材（29a）を蓄冷させる蓄冷制御手段
（５）と、前記冷房開始指示手段（68）からの信号に基づいて、
この冷房開始指示手段（68）が前記第２送風機（63）の
起動を指示したとき、前記第２送風機（63）を駆動させ
て前記蓄冷材（29a）による冷風を前記第２吹出口（6
4）から前記車室内の所定区域に吹き出す冷房制御手段
（５）とを備え、前記ケース（60）は車室内の側壁部に設けられ、前記吸込口（62）は、前記ケース（60）の前面の下方
部に形成され、前記第２吹出口（64）は、前記ケース（60）の前面の
上方部に形成された車両用冷房装置を特徴としている。なお、上記「車室内の所定区域」とは、冷凍車の冷凍
コンテナのような区域ではなく、人間が乗車している車
室内の一区域をいい、例えば仮眠等をするための区域が
相当する。また、上記各手段の括弧内の符号は、後述する実施例
の具体的手段との対応関係を示すものである。〔発明の作用効果〕上記構成によると、車両エンジンによって冷凍サイク
ルを駆動して、第１冷却ユニットにて車室内を冷房して
いるとき、蓄冷開始指示手段が第２蒸発器への冷媒供給
を指示したときは、冷凍サイクルの冷媒が第２蒸発器へ
供給されるように弁が制御され、蓄冷材が蓄冷される。
ここで、第２蒸発器と蓄冷材はケース内に収納されてい
るので、冷房開始指示手段による第２送風機の開始の指
示がなければ、第２送風機が作動せず、故にケース内の
第２蒸発器および蓄冷材とケース外と空気との直接的に
熱交換がなくなり、効率良く蓄冷することができる。また、車室内乗員が、車室内の所定区域にて仮眠をす
るために、冷房開始指示手段にて第２送風機の起動を指
示したときには、第２送風機が作動し、車室内の側壁部
に設けられたケースの前面下方部の吸込口からこのケー
ス内に空気が吸い込まれ、この吸い込まれた空気が蓄冷
材により冷却された後、ケースの前面上方部の第２吹出
口から吹き出されて、上記所定区域内に強制対流され
る。これによって、上記所定区域全体が効率良く冷房さ
れる。ここで、上記のように、ケースを車室内の側壁部に
設け、吸込口をケース前面の下方部に形成し、第２
吹出口をケース前面の上方部に形成する、ことによっ
て、上記所定区域内に冷気を強制対流させるにあたって
以下のような優れた効果を奏する。まず、ケースの第２吹出口から冷風を吹き出すにあた
って、この第２吹出口は車室内の上方に位置している方
が良い。なぜなら、第２吹出口が車室内の上方に位置し
ていれば、車室内の所定区域にて仮眠している乗員の上
方から冷風が降ってくる感じとなり、乗員を心地良く仮
眠させることができるし、逆に第２吹出口が車室内の下
方に位置していると、冷たい冷風が仮眠している乗員に
直にあたってしまって、乗員を心地良く仮眠させること
ができないからである。そこで、第２吹出口を車室内の上方に位置させるため
の方法として、第２冷却ユニットのケースを車室内の天
井部に設ける方法が考えられる。しかし、この方法の場
合、本発明のように、第１冷却ユニットの第１蒸発器と
第２冷却ユニットの第２蒸発器とを同一の冷凍サイクル
にて構成していると、冷凍サイクルの冷媒配管を天井部
までもっていかなければならず、冷媒配管の取り廻し上
の問題が出てくる。以上のことを踏まえて、本発明では、ケースを車室内
の側壁部に設け、ケースの前面の下方部に吸込口、上方
部に第２吹出口をそれぞれ形成するようにしたので、上
記のようにケースを天井部に設けた場合に発生する冷媒
配管の取り廻し上の問題を解決しながら、仮眠している
乗員の上方から冷風を吹き出して心地良い仮眠を実現す
ることができるという、優れた効果を奏する。〔実施例〕以下、本発明を図に示す実施例に基づいて説明する。
図１および図２は第１実施例を示すもので、図１は、ト
ラック等の車両において運転室および仮眠室の冷房を行
うための自動車用冷凍サイクルを示しており、圧縮機21
は、電磁クラッチ20を介して図示しない自動車エンジン
の駆動軸に結合されている。この圧縮機21は、本例では
10気筒の斜板式圧縮機を用いており、そのうち８気筒を
運転室用の主圧縮部21aとして構成し、残り２気筒を仮
眠室用の副圧縮部21bとして構成している。この場合、
圧縮機21の各圧縮部21a,21bにはそれぞれ運転室用主吸
入口21eと仮眠室用副吸入口21fが独立に設けられてお
り、各圧縮部がそれぞれ異なる吸入圧力を独立に設定し
得るようになっている。例えば運転室用主吸入口21eで
は2.0kg/cm²G、仮眠室用副吸入口21fでは1.2kg/cm²Gと
いう吸入圧力を独立に設定できる。また、運転室用主圧
縮部21aと仮眠室用副圧縮部21bは、相互に連絡路21dに
よって連通され、各吸入口21e,21fからそれぞれ吸入さ
れた圧力の異なる冷媒（R12）は、各圧縮部21a,21bにて
圧縮される前に連通路21bによって連通され、運転室側
の冷媒の圧力まで高められた後、各圧縮部21a,21bにて
それぞれ圧縮され、共通の吐出口21cから圧縮機外部へ
吐出されるようになっている。このような形式の圧縮機
21は、本出願人が先に提案している特開昭60−48463号
公報にて公知になっているので、具体的な説明は省略す
る。ここで、圧縮機21は上記のような斜板式の多気筒のも
のの他に、ベーン型圧縮機についても適用できる。その
場合、ロータの回転方向に沿って吸入圧力の低い順に仮
眠室用副吸入口21f、運転室用主吸入口21eを開口すれ
ば、それぞれの圧縮部21b,21aは全て最も高い吸入圧2.0
kg/cm²になった状態で圧縮を開始することが可能とな
る。上記のように本実施例の圧縮機21のそれぞれの圧縮
部21a,21bには独立の吸入口21e,21fが設けられており、
それぞれ圧縮部の吸入圧力を独立に設定することが可能
となる。上記圧縮機21の吐出口21cは、図１に示すように凝縮
器22に接続され、凝縮器22の吐出側はレシーバ23に接続
されている。レシーバ23の吐出側には運転室冷房用減圧
装置、本例では温度作動式膨張弁24、及びこれに接続す
る冷房用蒸発器25が設けられており、この蒸発器25の空
気上流側には、冷房用の送風機26が配設されている。蒸
発器25の冷媒出口側は運転室用吸入配管45によって圧縮
機21の運転室用主吸入口21eに接続されている。本例で
は、上記した機器24,25,26等により運転室冷房用の第１
冷却ユニットＡが構成されている。一方、仮眠室減圧装置の具体例である定圧膨張弁27
と、この定圧膨張弁27に接続された仮眠室用蒸発器28
は、前記した運転室用膨張弁24及び蒸発器25の並列に設
けられている。仮眠室用蒸発器28とこれによって冷却さ
れる蓄冷材（本実施例では凍結温度が−５℃の塩水）を
封入する袋状の蓄冷材パック29a、およびこの蓄冷材パ
ック29aに向かって空気を送風する送風機63は、後述す
るケース60内に収納されているが、このケース60および
ケース60内の内部構造の詳細は後でする。そして仮眠室用蒸発器28の出口側には、冷媒ガスを圧
縮機吸入側への一方向のみに通過させる逆止弁33が接さ
れており、この逆止弁33の吐出側は、仮眠室吸入配管46
によって前記圧縮機21の仮眠室用副吸入口21fに接続さ
れている。なお、前記定圧膨張弁27はその下流圧力すな
わち仮眠室用蒸発器28の圧力が設定圧力例えば1.2kg/cm
²以下に低下すると開弁し、その下流圧力を設定圧力に
維持するものである。本例では、上記機器27,28,29,3
3、60、63等により仮眠室冷房用の第２冷却ユニットＢ
が構成されている。前記運転室用吸入配管45と仮眠室用吸入配管46の間に
は、これらを連通する連通配管47が設けられ、この連通
配管47には電磁弁48が設けられ、この電磁片48の開弁に
より吸入配管45と46とが連通するようになっている。次に、本実施例の電気回路について説明する。１は車載バッテリであり、このバッテリ１には運転室
用冷房用スイッチ２を介して第１制御回路３が接続され
ている。４は仮眠室蓄冷用スイッチであり、運転室冷房
用スイッチ２を介してバッテリ１に接続されており、仮
眠室蓄冷用スイッチ４には、第２制御回路５が接続され
ている。６は蒸発器25の空気吹出側に設けられた温度セ
ンサで、サーミスタよりなり、第１制御回路３に接続さ
れ、温度センサ６は蒸発器25の連結を防止するために蒸
発器吹出温度が設定温度以下になると抵抗が増大し、第
１制御回路３がこの抵抗値の変化を感知し、電磁クラッ
チ20への通電をオフし、圧縮機21を停止させるようにな
っている。７は仮眠室用蒸発器28によって冷却されるケース60内
の蓄冷材パック29a内の蓄冷材の蓄冷材温度を感知する
ように設けられた温度センサで、サーミスタよりなる。
この温度センサ７は材２制御回路５に接続され、この第
２制御回路５は、温度センサ７の感知温度が制定温度以
下になると、電磁弁48への通電を遮断して、この電磁弁
48を開弁させるようになっている。なお、第２制御回路
５は温度センサ７の検出温度が上記設定温度より若干高
めの別の設定値まで低下すると、ランプ、LED等の表示
装置８を点灯させ、蓄冷完了を表示するようになってい
る。また、この表示装置８は、後述する運転室内の計器
盤部等に設置されている。図２は図１に示した冷凍サイクル部分の車両への具体
的搭載構造を例示するものであって、50はトラックの運
転室、51は運転室50の後方側に形成された仮眠室で、カ
ーテンなどの仕切り部材51aによって運転室50と仕切ら
れている。52は仮眠室51のベッドである。53は運転室50
の前部に位置する計器盤で、運転室冷房用の第１冷却ユ
ニットＡは計器盤53の下方部に配設されている。54は計
器盤53の上方部に開口している冷風吹出用の吹出口で、
蒸発器25で冷却された冷風を運転室内の乗員（運転者及
び助手席乗員）の上半身に向かって吹出す。55は運転室
50及び仮眠室51の床である。なお、圧縮機21等は床55下
方の車両エンジンルームに設置されている。一方、仮眠室冷房用の第２冷却ユニットＢは、図２に
示すように仮眠室51内においてベッド52の後方位置に配
設されている。図３に仮眠室用蒸発器28および蓄冷材パック29aの詳
細図、図４にケース60の詳細図を示す。第２冷却ユニットＢのケース60は、ステンレス等の金
属にて図４のように箱状に形成されている。このケース
60の内部には、仮眠室用蒸発器28及び蓄冷材29を封入し
た蓄冷材パック29aが収納されている。また、このケース60は、蓄冷材パック29aに蓄冷され
た蓄冷熱が仮眠室51へ逃げないように遮断する機能を果
たしている。ケース60内の最下部には仮眠室用蒸発器28
で生じるドレン水（凝縮水）を受けるためのドレン受け
皿61が配置され、かつこの受け皿61はドレン水処理のた
めにケース前方へ引き出し可能に設けられている。ま
た、図示しないがドレン受け皿61にたまったドレン水
を、床55を貫通するように設けられたドレンパイプによ
って室外に排出するように構成しても良い。なお、図２
では、図示の便宜を図るため、定圧膨張便27および逆止
弁33を床55の下方に図示しているが、実際はこの両弁2
7,33は床55の上方においてドレン受け皿61等と一体的に
構成され、一つのユニットＢを構成している。仮眠室用蒸発器28は、本例では第３図に示すごとき構
成であって、蓄冷型熱交換器として構成してある。すな
わち、冷媒が流通する冷媒通路（冷媒配管）である多穴
偏平チューブ28aと、冷媒入口パイプ28bと、冷媒出口パ
イプ28cとを有し、更偏平チューブ28aは蛇行状に曲げ形
成され、偏平チューブ28aの平行部分の表裏両面には、
蓄冷材を変形自在な袋体（樹脂製、アルミ箔製等）内に
密封した蓄冷材パック29aが多数個接着等の手段により
固着してある。仮眠室用蒸発器28は、第４図に示すよう
に偏平チューブ28aが上下方向で蛇行するようにしてケ
ース60内に設置されている。ケース60の前面において、仮眠室用蒸発器28とドレン
受け皿61との間の位置に仮眠室51内の空気を吸入する吸
込口62が設けられている。ケース60内において、仮眠室
用蒸発器28の上方位置に、軸流ファンを用いた２個の送
風機63,63が並列設置されており、そしてケース60の前
面において、送風機63,63の上方部位に仮眠室51に空気
を吹き出す吹出口64が設けられている。蓄冷温度を感知する温度センサ７は、本例では偏平チ
ューブ28aのうち最も冷媒出口側に位置する部位に固着
された蓄冷材パック29aの外表面上に密着固定し、温度
センサ表面を断熱材で被覆することにより空気温度を感
知しないようにしてある。 65は仮眠室51の室温を感知するサーミスタよりなる温
度センサで、ケース60において蒸発器28と送風機63,63
との間の部位にあけられた小穴66に設置されている。す
なわち、小穴66から送風機63,63の吸込側に吸収される
室内空気の流路中に温度センサ65を位置させて、仮眠室
51の室温を感知するようにしてある。なお、温度センサ
65は、図１に示すように第２制御回路５に接続されてい
る。次に、本実施例の作動を説明する。第５図は冷凍サイ
クルのモリエル線図であり、図中実線90のサイクルは、
運転室冷房用の冷凍サイクルの作動特性を示し、一点鎖
線91は仮眠室冷房用の冷凍サイクルの作動特性を示して
いる。運転室冷房用スイッチ２を投入すると、第１制御
回路３に給電されるが、冷房始動時には蒸発器25の吹出
空気温度が設定温度（例えば３℃）より高いので、第１
制御回路３が温度センサ６の検出信号と基準信号とを比
較して“Hi"レベルの出力を出し電磁クラッチ20に通電
する。すると、電磁クラッチ20が接続状態となり、自動
車エンジンの駆動力が圧縮機21に伝達されるので、圧縮
機21は回転し、冷媒ガスの圧縮を行う。上記状態において、仮眠室蓄冷用スイッチ４を更に投
入すると、第２制御回路５に給電されるが、始動時には
蓄冷材の温度が設定温度（例えば−８℃）より高いの
で、第２制御回路５が温度センサ７の検出信号と基準信
号とを比較して、“Hi"レベルの出力を出し、電磁弁48
に通電するので、電磁弁48は閉じたままであり、また表
示装置８には“Lo"レベルの出力を与えるので表示装置
８は消灯したままである。上記電磁弁48が閉じているた
め、運転室用吸入配管45からの運転室側冷媒は圧縮機21
の主吸入口21eに、また仮眠室冷房用吸入配管46からの
仮眠室側の冷媒は圧縮機21の副吸入口12fにそれぞれ独
立に吸入される。ここで、圧縮機21における仮眠室用副圧縮部21bは前
述した通り吸入行程を終り（下死点近傍）で連通路21d
を介して運転室用主圧縮部21aに連通するので、副圧縮
部21b内の圧力は主圧縮部21aからの冷媒流入により、運
転室側と同じ圧力、すなわち2.0kg/cm²まで上昇（第３
図のP₆→P₃）する。従って、両圧縮部21a,21bはいずれ
も2.0kg/cm²の圧力の冷媒を圧縮（第３図のP₃→P₄）す
る。この圧縮された冷媒ガスは、両者混合されて吐出口
21cから吐出され、凝縮器22によって冷却（第３図のP₄
→P₁）される。この液化冷媒はレシーバ23に蓄えられ、定圧膨張弁27
及び温度作動式膨張弁24の作用によって減圧（P₁→P₅及
びP₁→P₂）され、その後仮眠室用蒸発器28及び25内にお
いてそれぞれ蒸発（P₅→P₆及びP₂→P₃）する。ここで、
P₁点は、温度作動式膨張弁24の入口側の高圧冷媒の状態
を表し、P₂は、膨張弁24の吐出側の冷媒の状態を表し、
P₃は運転室冷房用主圧縮部21aの吸入口21eにおける冷媒
の状態を表し、P₄は吐出口21での冷媒の状態を表す。運転室冷房用の第１冷却ユニットＡでは、送風機26の
送風空気を蒸発器25で冷却して冷風とし、この冷風を吹
出口54から運転室50内に吹出すことにより運転室50の冷
房を行う。一方、仮眠室用のサイクルでは定圧膨張弁27の開弁圧
を適当に設定することによって、定圧膨張弁27の下流で
の冷媒の状態をP₅に設定する。具体的には、定圧膨張弁
27の作用により仮眠室用蒸発器28の蒸発圧力を1.2kg/cm
²に維持することが可能である。以上の様に仮眠室用蒸
発器28内の蒸発圧力を1.2kg/cm²に維持することによっ
て、冷媒蒸発温度を−10℃に保持し、蓄冷材を冷却し、
徐々に凍結することが可能である。また、この際、上述
したようにケース60によって蓄冷材によって蓄冷された
蓄冷熱が、仮眠室51に逃げないように遮断しているた
め、蓄冷効率が非常に良い。従って、蓄冷完了時間を短
くすることができる。蓄冷材量が例えば12の場合、３時間程度の車両走行
により蓄冷材の凍結が完了（換言すれば蓄冷完了）し、
そして温度センサ７の検出温度が設定温度（例えば−６
℃）まで低下すると、温度センサ７の検出信号を制御回
路５が判別して、表示装置８に“Hi"レベルの出力を与
えるので、表示装置８が点灯して、蓄冷材の凍結（蓄
冷）完了を運転者に表示する。そして、温度センサ７の
検出温度が上記設定温度より更に低い別の設定値温度例
えば−８℃まで低下すると、温度センサ７の検出信号を
制御回路５が判別して、電磁弁48に“Lo"レベルの出力
を与え、この電磁弁48を開弁する。すると、連通配管47
が開通するので、この連通配管47を介して運転室側の冷
媒が圧縮機21の副吸入口21のｆにも流入するようにな
る。これにより、仮眠室用吸入配管46内の圧力は、運転
室側の冷媒圧力（2.0kg/cm²）まで上昇するので、定圧
膨張弁27は以後閉じたままとなり、圧縮機21の全気筒は
運転室冷房用として使用される。なお、運転室側の冷媒
が、仮眠室側の仮眠室用蒸発器28に逆流することは逆止
弁33によって阻止されるので、仮眠室用蒸発器28内はし
ばらくの間低温状態を保つ。なお、表示装置８を点灯させる時の温度（例えば−６
℃）より電磁弁48を開弁させる時の温度（例えば−８
℃）の方を低くした理由は、電磁弁48の開弁により、短
時間で蓄冷材の温度が上昇して表示装置８が消灯状態に
戻るという不具合を防止するためである。さらに、駐車時において仮眠室51の冷房を行う時は、
冷房開始スイッチ68を投入する。これによりリレー69の
接点69aおよび第２制御回路５に電源電圧が印加され
る。温度センサ65により検出される仮眠室51の室温が設
定温度（例えば26℃）より高い時は第２制御回路５によ
ってリレー69のコイル69bに通電され、接点69aが閉じる
ので、送風機63に通電され、送風機63が作動する。これ
により、仮眠室内空気がケース60の吸込口62からケース
60内に吸入され、仮眠室用蒸発器28の偏平チューブ28a
に固着された蓄例材パック29aの表面に沿って上昇し、
この間に蓄冷材の融解潜熱により吸入空気が冷却されて
冷風となり、吹出口64から仮眠室51内へ吹出し、仮眠室
51の冷房を行う。つまり、この冷房開始スイッチ68を投
入（オン）することで、蓄冷材の蓄冷熱が、初めて仮眠
室51に放出されることになる。従って、乗員の希望に応
じて、効率良く蓄冷された蓄冷熱を仮眠室51へ放出する
ことができ、長時間、仮眠室を冷却できる。また、仮眠室51を冷却中、仮眠室51の室温が設定温度
（26℃）まで低下すると、温度センサ65の検出信号に基
づいてリレー69への通電が遮断され、接点69aが開状態
となるので、送風機63が停止する。このように、仮眠室
51の室温に応じて、送風機63の作動を自動的に断続する
ことにより、仮眠室51の冷えすぎを防止するとともに、
蓄冷材29の凍結状態をなるべく長時間維持して、駐車時
における仮眠室の冷房作用をさらに長時間発揮すること
ができる。なお、本発明は上述の図示実施例に限定されるもので
はなく、以下に述べる変形例にも適用できる。上記ケース60内の蓄冷材温度とケース60の外表面温度
とは相関関係があるので、温度センサ７をケース60の外
表面に密着固定して、ケース60の外表面温度を検出する
ようにしても良い。冷凍サイクルの構成は、第１図に示すように、２つ吸
入口21e,21fを有する圧縮機21を用いて、運転室側と仮
眠室側とに連続的に流通させるものの他に、特開昭59−
50828号公報に示されるごとく、タイマー回路により電
磁弁を断続的に開閉して、運転室側と仮眠室側に冷媒を
交互に流通させる構成等に変更しても良い。仮眠室側の減圧装置として、定圧膨張弁27の他に、温
度作動式膨張弁、電磁弁および固定絞り等の組み合わせ
でも良い。上記実施例では、蓄冷材パック29aと一体化した仮眠
室用蒸発器28ををケース60内に設置するにあたって、偏
平チューブ28の蛇行方向がケース60の上下方向（空気流
れ方向）と一致するようにして仮眠室用蒸発器28を設置
したが、偏平チューブ28aの蛇行方向が水平方向（空気
流れと直角方向）となるようにして、仮眠室用蒸発器28
を設置しても良い。このようにすれば、空気の通風抵抗
が減少する。この場合、仮眠室用蒸発器28を上下方向に
複数段積層するようにしてもよい。上記実施例では、仮眠室51の室温を検出する温度セン
サ65の検出信号により送風機63の作動を自動的に断続す
るようにしたが、蓄冷材パック29aの温度が所定温度以
上に上昇して冷房機能を発揮できないようになった時、
温度センサ７の検出信号により送風機63を停止させると
か、車載バッテリ１を過放電を防ぐため、第２制御回路
５内にタイマー手段を設け、冷房開始スイッチ68の投入
後、所定時間経過すると、前記タイマー手段により自動
的に送風機63の作動を停止するようにしても良い。上記実施例では、トラックにおける運転室50と仮眠室
51の冷房を行う冷房装置に本発明を適用した場合につい
て説明したが、本発明は、例えばワゴン車（ワンボック
ス車）における前席（運転室および助手席）側の冷房
と、後席側の冷房を行う冷房装置にも本発明は同様に適
用できる。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle cooling device that can cool a nap room or the like of a truck satisfactorily even when parked (when the engine is stopped). 2. Description of the Related Art Conventionally, there has been a conventional technology disclosed in Japanese Utility Model Laid-Open No. 58-58919, for example, for cooling a vehicle interior while an engine is stopped. This cools the heat in a regenerative heat exchanger (12, reference numeral in the gazette, the same applies hereinafter) during engine operation (refrigeration cycle operation), and heat pipes in the regenerative heat exchanger (12). By inserting one end of (15) and exposing the other end to the vehicle interior (nap room), the vehicle interior (nap room) is cooled through the heat pipe (15). [Problems to be Solved by the Invention] However, when the cold storage heat exchanger (12) has a high cold storage compartment temperature, the heat pipe (15) transfers the heat in the passenger compartment to the cold storage heat exchanger (12). It is transported and always carries cold air into the passenger compartment. That is, if the vehicle interior temperature is high, even during the cold storage, the cold storage heat is constantly released into the vehicle interior by the heat pipe. Therefore, there is a problem that the cold storage efficiency of the cold storage heat exchanger (12) is poor, and it takes more time than necessary to perform sufficient cold storage. In addition, when the occupant wants to take a rest (nap), there is a problem that a sufficient amount of cold storage is not secured in the cold storage heat exchanger (12) and the nap room cannot be cooled for a sufficient time. Accordingly, the present invention has been made in view of the above-described problems, and it is possible to release cold storage heat of a cold storage material into a vehicle compartment only when an occupant wants to cool a nap room, thereby improving a cold storage efficiency for a vehicle. It is an object to provide a cooling device. [Means for Solving the Problems] To achieve the above object, the present invention provides a first refrigeration cycle driven by a vehicle engine.
An evaporator (25), a first blower (26) for blowing the air toward the first evaporator (25), and a first blower for blowing the cool air cooled by the first evaporator (25) into the vehicle interior. Exit (5
4) a first cooling unit (A) provided to cool the vehicle interior by blowing the cold air from the first outlet (54) into the vehicle interior; and a refrigeration cycle. A second evaporator (28), the second evaporator (28) during operation of the refrigeration cycle;
Cold storage material (29a), which is configured so that it can store cold
At least the second evaporator (28) and the cold storage material (29a)
And the air inlet (62) and the second outlet (6
4) formed case (60), and said suction port (6
2) to the second outlet (64), the cold storage material (2
A second blower (63) for blowing air into the case (60) along 9a), and blowing the cool air from the second air outlet (64) to a predetermined area in the vehicle compartment to reduce the predetermined area. Second cooling unit (B) provided for cooling
A valve (48) for switching between a state in which the refrigerant of the refrigeration cycle is supplied to the second evaporator (28) and a state in which the refrigerant is not supplied.
Cold storage start instructing means (4) for instructing supply of refrigerant to the second evaporator (28); cooling start instructing means (68) for instructing activation of the second blower (63); Based on the signal from the indicating means (4),
When the cold storage start instructing means (4) instructs the supply of the refrigerant to the second evaporator (28), the valve (48) is configured to supply the refrigerant of the refrigeration cycle to the second evaporator (28). A cold storage control means (5) for controlling the cold storage material (29a) to cool the cold storage material (29a); and a signal from the cooling start instruction means (68).
When the cooling start instructing means (68) instructs the activation of the second blower (63), the second blower (63) is driven so that the cool air from the cold storage material (29a) is blown into the second outlet (6).
A cooling control means (5) for blowing air from 4) to a predetermined area in the vehicle interior, wherein the case (60) is provided on a side wall portion in the vehicle interior, and the suction port (62) is provided on the side of the case (60). The second air outlet (64) is formed at a lower part of a front surface, and is characterized by a vehicle cooling device formed at an upper part of a front surface of the case (60). In addition, the above-mentioned "predetermined area in the passenger compartment" does not refer to an area such as a refrigerated container of a freezing car, but refers to an area in the passenger compartment in which a person is riding, for example, an area for taking a nap or the like. . Further, the reference numerals in parentheses of the above means indicate the correspondence with the concrete means of the embodiment described later. According to the above configuration, when the vehicle engine drives the refrigeration cycle and the first cooling unit cools the vehicle interior, the cold storage start instruction means supplies the refrigerant to the second evaporator. When instructed, the valve is controlled so that the refrigerant of the refrigeration cycle is supplied to the second evaporator, and the cold storage material is stored.
Here, since the second evaporator and the cold storage material are stored in the case, the second blower does not operate unless the cooling start instruction means instructs the start of the second blower. There is no direct heat exchange between the evaporator and the cold storage material and the outside of the case and the air, so that the cold storage can be performed efficiently. Also, when the passenger in the passenger compartment instructs the start of the second blower by the cooling start instructing means in order to take a nap in a predetermined area in the passenger compartment, the second blower operates and is provided on the side wall portion in the passenger compartment. Air is sucked into the case from the suction port at the lower part of the front surface of the case, and the sucked air is cooled by the regenerator material and then blown out from the second outlet at the upper part of the front surface of the case. Forced convection in a predetermined area. Thus, the entire predetermined area is efficiently cooled. Here, as described above, the case is provided on the side wall in the vehicle interior, and the suction port is formed on the lower part of the front of the case.
By forming the air outlet in the upper portion of the front surface of the case, the following excellent effects can be obtained in forcing cold air into the predetermined area. First, when blowing cool air from the second outlet of the case, it is better that the second outlet is located above the vehicle interior. This is because if the second air outlet is located above the passenger compartment, it is felt that cold air is falling from above the occupant who is napping in a predetermined area in the passenger compartment, and the occupant can comfortably take a nap. On the other hand, if the second outlet is located below the passenger compartment, the cold cold air directly hits the sleeping occupant, and the occupant cannot comfortably take a nap. Then, as a method for positioning the second outlet above the vehicle interior, a method of providing a case of the second cooling unit on the ceiling portion of the vehicle interior is conceivable. However, in the case of this method, if the first evaporator of the first cooling unit and the second evaporator of the second cooling unit are constituted by the same refrigeration cycle as in the present invention, the refrigerant of the refrigeration cycle The pipes must be brought to the ceiling, which poses a problem in managing the refrigerant pipes. Based on the above, in the present invention, the case is provided on the side wall portion in the vehicle interior, and the suction port is formed in the lower part of the front surface of the case, and the second outlet is formed in the upper part. It is possible to achieve a comfortable nap by blowing cold air from above the napping occupant while solving the problem of routing the refrigerant pipes that occurs when the case is installed on the ceiling part. It works. [Example] Hereinafter, the present invention will be described based on an example shown in the drawings.
FIGS. 1 and 2 show a first embodiment. FIG. 1 shows an automotive refrigeration cycle for cooling a cab and a nap room in a vehicle such as a truck.
Is connected to a drive shaft of an automobile engine (not shown) via an electromagnetic clutch 20. In this example, the compressor 21
A 10-cylinder swash plate type compressor is used, of which 8 cylinders are configured as a main compression section 21a for a driver's cab and the remaining 2 cylinders are configured as a sub-compression section 21b for a nap room. in this case,
Each of the compressors 21a and 21b of the compressor 21 is independently provided with a main cab suction port 21e and a nap room sub suction port 21f, and each compression unit can independently set a different suction pressure. It has become. For example, the suction pressure of 2.0 kg / cm ² G can be set independently in the main suction port 21e for the driver's cab and 1.2 kg / cm ² G in the sub suction port 21f for the nap room. The cab main compression section 21a and the nap room sub-compression section 21b are connected to each other by a communication path 21d, and the refrigerants (R12) having different pressures sucked from the respective suction ports 21e and 21f are compressed by the respective compression ports. Before being compressed by the parts 21a and 21b, they are communicated by the communication path 21b, and after the pressure of the refrigerant on the cab side is increased, they are compressed by the compression parts 21a and 21b, respectively, and compressed from the common discharge port 21c. It is designed to be discharged outside the machine. Compressor of this type
21 is known in Japanese Patent Application Laid-Open No. 60-48463, which has been previously proposed by the present applicant, and a detailed description thereof will be omitted. Here, the compressor 21 can be applied to a vane compressor in addition to the swash plate type multi-cylinder as described above. In that case, if the nap room sub suction port 21f and the cab main suction port 21e are opened in ascending pressure order along the rotation direction of the rotor, the respective compression units 21b and 21a will all have the highest suction pressure 2.0.
Compression can be started in the state of kg / cm ² . As described above, the compressor 21 of the present embodiment is provided with independent suction ports 21e and 21f in the respective compression sections 21a and 21b,
It is possible to independently set the suction pressure of each compression section. The discharge port 21c of the compressor 21 is connected to a condenser 22 as shown in FIG. 1, and the discharge side of the condenser 22 is connected to a receiver 23. On the discharge side of the receiver 23, a cab cooling decompression device, in this example, a temperature-operated expansion valve 24, and a cooling evaporator 25 connected thereto are provided, and on the air upstream side of the evaporator 25, , A cooling air blower 26 is provided. The refrigerant outlet side of the evaporator 25 is connected to the cab main suction port 21e of the compressor 21 by the cab suction pipe 45. In this example, the first equipment for cooling the operator cab is provided by the devices 24, 25, and 26 described above.
A cooling unit A is configured. On the other hand, a constant pressure expansion valve 27 which is a specific example of the nap room pressure reducing device
And a nap room evaporator 28 connected to the constant pressure expansion valve 27.
Is provided in parallel with the cab expansion valve 24 and the evaporator 25 described above. A bag-shaped cold storage material pack 29a for enclosing a nap room evaporator 28 and a cold storage material (salt water having a freezing temperature of −5 ° C. in this embodiment) to be cooled by this, and air is directed toward the cold storage material pack 29a. The blower 63 for blowing air is housed in a case 60 described later, and details of the case 60 and an internal structure in the case 60 will be described later. A check valve 33 that allows the refrigerant gas to pass in only one direction to the compressor suction side is connected to the outlet side of the nap room evaporator 28, and the discharge side of the check valve 33 is connected to the nap room. Intake piping 46
The compressor 21 is connected to the nap room sub suction port 21f of the compressor 21. The constant-pressure expansion valve 27 has a downstream pressure, that is, the pressure of the nap room evaporator 28 is set to a set pressure, for example, 1.2 kg / cm.
^{When the} pressure drops below ² , the valve opens and the downstream pressure is maintained at the set pressure. In this example, the above devices 27, 28, 29, 3
Second cooling unit B for nap room cooling by 3, 60, 63, etc.
Is configured. Between the cab suction pipe 45 and the nap room suction pipe 46, a communication pipe 47 for communicating these is provided, and the communication pipe 47 is provided with an electromagnetic valve 48, and the electromagnetic piece 48 is opened. This allows the suction pipes 45 and 46 to communicate with each other. Next, the electric circuit of the present embodiment will be described. Reference numeral 1 denotes an on-vehicle battery, and a first control circuit 3 is connected to the battery 1 via a cab cooling switch 2. Reference numeral 4 denotes a nap room cold storage switch, which is connected to the battery 1 via a cab cooling switch 2, and a second control circuit 5 is connected to the nap room cold storage switch 4. Reference numeral 6 denotes a temperature sensor provided on the air blowing side of the evaporator 25, which is composed of a thermistor and is connected to the first control circuit 3. The temperature sensor 6 sets the evaporator blowing temperature to prevent the connection of the evaporator 25. When the temperature falls below the temperature, the resistance increases, and the first control circuit 3 senses this change in the resistance value, turns off the power supply to the electromagnetic clutch 20, and stops the compressor 21. Reference numeral 7 denotes a temperature sensor provided to sense the temperature of the cold storage material in the cold storage material pack 29a in the case 60 cooled by the nap room evaporator 28, and comprises a thermistor.
The temperature sensor 7 is connected to the material 2 control circuit 5, and when the temperature sensed by the temperature sensor 7 falls below the established temperature, the second control circuit 5 cuts off the power supply to the solenoid valve 48,
48 is opened. When the temperature detected by the temperature sensor 7 drops to another set value slightly higher than the set temperature, the second control circuit 5 turns on a display device 8 such as a lamp or an LED to display the completion of cold storage. ing. In addition, the display device 8 is installed on an instrument panel or the like in a cab described later. FIG. 2 illustrates a specific mounting structure of the refrigeration cycle portion shown in FIG. 1 on a vehicle, where 50 is a cab of a truck, 51 is a nap room formed on the rear side of the cab 50, The cab 50 is partitioned by a partition member 51a such as a curtain. Reference numeral 52 denotes a bed in the nap room 51. 53 is the driver's cab 50
The first cooling unit A for cooling the cab is disposed below the instrument panel 53. 54 is an outlet for blowing cool air, which is open at the upper part of the instrument panel 53,
The cool air cooled by the evaporator 25 is blown out toward the upper body of the occupants (driver and front passenger) in the cab. 55 is the driver's cab
50 and nap room 51 floor. The compressor 21 and the like are installed in the vehicle engine room below the floor 55. On the other hand, the second cooling unit B for nap room cooling is disposed in the nap room 51 at a position behind the bed 52 as shown in FIG. FIG. 3 is a detailed view of the nap room evaporator 28 and the cold storage material pack 29a, and FIG. The case 60 of the second cooling unit B is formed of a metal such as stainless steel into a box shape as shown in FIG. This case
A cold storage material pack 29a enclosing a nap room evaporator 28 and a cold storage material 29 is housed inside 60. Further, this case 60 has a function of shutting off the cold storage heat stored in the cold storage material pack 29a so as not to escape to the nap room 51. At the bottom of the case 60, a nap room evaporator 28
A drain tray 61 for receiving drain water (condensed water) generated in the above is disposed, and the tray 61 is provided so as to be drawn out to the front of the case for drain water treatment. Although not shown, the drain water accumulated in the drain tray 61 may be drained out of the room by a drain pipe provided to penetrate the floor 55. Note that FIG.
Here, for convenience of illustration, the constant-pressure inflation stool 27 and the check valve 33 are shown below the floor 55, but in reality these two valves 2
The units 7 and 33 are integrally formed with the drain pan 61 and the like above the floor 55 to constitute one unit B. The nap room evaporator 28 has a configuration as shown in FIG. 3 in this example, and is configured as a regenerative heat exchanger. That is, it has a multi-hole flat tube 28a that is a refrigerant passage (refrigerant pipe) through which the refrigerant flows, a refrigerant inlet pipe 28b, and a refrigerant outlet pipe 28c, and the further flat tube 28a is formed to bend in a meandering shape. On both sides of the parallel part of 28a,
A regenerator material pack 29a in which a regenerator material is sealed in a deformable bag (made of resin, aluminum foil, etc.) is fixed by means of bonding or the like. The nap room evaporator 28 is installed in the case 60 such that the flat tube 28a meanders in the vertical direction as shown in FIG. On the front surface of the case 60, a suction port 62 for sucking air in the napping room 51 is provided at a position between the napping room evaporator 28 and the drain pan 61. In the case 60, two fans 63, 63 using an axial fan are installed in parallel above the nap room evaporator 28, and on the front of the case 60, the upper part of the fans 63, 63 An outlet 64 for blowing air into the nap room 51 is provided. In this example, the temperature sensor 7 for sensing the cold storage temperature is tightly fixed on the outer surface of the cold storage material pack 29a fixed to the portion of the flat tube 28a located closest to the refrigerant outlet, and the temperature sensor surface is made of a heat insulating material. Air temperature is not sensed by coating. Numeral 65 is a temperature sensor comprising a thermistor for sensing the room temperature of the nap room 51. In the case 60, the evaporator 28 and the blowers 63, 63 are provided.
It is installed in a small hole 66 drilled in the area between That is, the temperature sensor 65 is located in the flow path of the room air absorbed from the small hole 66 to the suction side of the blowers 63, 63, and the nap room
It senses 51 room temperature. Note that the temperature sensor
65 is connected to the second control circuit 5 as shown in FIG. Next, the operation of the present embodiment will be described. FIG. 5 is a Mollier diagram of the refrigeration cycle, and the cycle indicated by a solid line 90 in the figure is
The operation characteristics of the refrigeration cycle for cab cooling are shown, and the dashed line 91 shows the operation characteristics of the refrigeration cycle for nap room cooling. When the operator cab cooling switch 2 is turned on, power is supplied to the first control circuit 3. However, at the start of cooling, the temperature of the air blown from the evaporator 25 is higher than a set temperature (for example, 3 ° C.).
The control circuit 3 compares the detection signal of the temperature sensor 6 with the reference signal, outputs a “Hi” level output, and energizes the electromagnetic clutch 20. Then, the electromagnetic clutch 20 is brought into the connected state, and the driving force of the automobile engine is transmitted to the compressor 21, so that the compressor 21 rotates and compresses the refrigerant gas. In the above state, when the nap room cold storage switch 4 is further turned on, power is supplied to the second control circuit 5, but at the time of starting, the temperature of the cold storage material is higher than a set temperature (for example, -8 ° C). Compares the detection signal of the temperature sensor 7 with the reference signal and outputs a “Hi” level output.
, The solenoid valve 48 is kept closed, and the display device 8 is given a "Lo" level output, so that the display device 8 remains off. Since the solenoid valve 48 is closed, the cab-side refrigerant from the cab suction pipe 45 is supplied to the compressor 21.
The refrigerant in the nap room side from the nap room cooling air suction pipe 46 from the nap room cooling air suction pipe 46 is independently sucked into the sub suction port 12f of the compressor 21. Here, as described above, the nap room sub-compressor 21b of the compressor 21 ends the suction stroke (near the bottom dead center) and communicates with the communication passage 21d.
The pressure in the sub-compression section 21b rises to the same pressure as the cab side, that is, 2.0 kg / cm ² due to the inflow of refrigerant from the main compression section 21a. 3
P ₆ → P ₃ in the figure) to. Therefore, both compression sections 21a and 21b compress the refrigerant having a pressure of 2.0 kg / cm ² (P ₃ → P _{4 in} FIG. ₃ ). This compressed refrigerant gas is mixed with
21c and cooled by the condenser 22 (P _{4 in} FIG. 3).
→ P ₁₎ to be. This liquefied refrigerant is stored in the receiver 23, and is supplied to the constant-pressure expansion valve 27.
Then, the pressure is reduced (P ₁ → P ₅ and P ₁ → P ₂ ) by the action of the temperature-operated expansion valve 24, and thereafter, they are evaporated (P ₅ → P ₆ and P ₂ → P ₂ ) in the nap room evaporators 28 and 25, respectively. ₃ ) Yes. here,
Point P ₁ represents the state of the high-pressure refrigerant on the inlet side of the temperature-operated expansion valve 24, P ₂ represents the state of the refrigerant on the discharge side of the expansion valve 24,
P ₃ represents a state of the refrigerant in the suction port 21e of the cab for cooling main compression portion 21a, P ₄ represents the state of the refrigerant in the discharge port 21. In the first cooling unit A for cab cooling, the blast air from the blower 26 is cooled by the evaporator 25 to form cool air, and the blast air is blown out of the outlet 54 into the cab 50 to cool the cab 50. Do. On the other hand, in the cycle for sleeping chamber by appropriately setting the opening pressure of the constant pressure expansion valve 27, it sets the state of the refrigerant downstream of the constant pressure expansion valve 27 to P _5. Specifically, a constant pressure expansion valve
By the action of 27, the evaporating pressure of the nap room evaporator 28 is 1.2 kg / cm
It is possible to keep at ² . By maintaining the evaporating pressure in the nap room evaporator 28 at 1.2 kg / cm ² as described above, the refrigerant evaporation temperature is maintained at −10 ° C., and the regenerator material is cooled.
It is possible to freeze slowly. Further, at this time, as described above, since the cold storage heat stored by the cold storage material by the case 60 is blocked so as not to escape to the nap room 51, the cold storage efficiency is very good. Therefore, the cold storage completion time can be shortened. When the amount of the cold storage material is 12, for example, the freezing of the cold storage material is completed by running the vehicle for about 3 hours (in other words, the cold storage is completed),
Then, the temperature detected by the temperature sensor 7 becomes equal to the set temperature (for example, -6
° C), the control circuit 5 determines the detection signal of the temperature sensor 7 and gives a "Hi" level output to the display device 8, so that the display device 8 is turned on to freeze the cold storage material (cool storage). The completion is displayed to the driver. When the temperature detected by the temperature sensor 7 drops to another set value temperature, for example, -8 ° C., which is lower than the above set temperature, the control circuit 5 determines the detection signal of the temperature sensor 7 and sends “Lo” to the solenoid valve 48. A level output is given, and the solenoid valve 48 is opened. Then, the communication pipe 47
Is opened, so that the refrigerant in the cab side flows into the sub suction port 21 of the compressor 21 via the communication pipe 47. As a result, the pressure in the nap room suction pipe 46 rises to the refrigerant pressure (2.0 kg / cm ² ) on the cab side, so that the constant-pressure expansion valve 27 remains closed thereafter, and all the cylinders of the compressor 21 Used for cab cooling. Since the check valve 33 prevents the refrigerant in the cab side from flowing back to the nap room side evaporator 28, the inside of the nap room evaporator 28 is kept at a low temperature for a while. The temperature at which the display device 8 is turned on (for example, -6
° C) when the solenoid valve 48 is opened (for example, -8
The reason for lowering the temperature (° C.) is to prevent a problem that the temperature of the cold storage material rises in a short time due to the opening of the solenoid valve 48 and the display device 8 returns to the light-off state. Furthermore, when cooling the nap room 51 during parking,
The cooling start switch 68 is turned on. As a result, the power supply voltage is applied to the contact 69a of the relay 69 and the second control circuit 5. When the room temperature of the nap room 51 detected by the temperature sensor 65 is higher than a set temperature (for example, 26 ° C.), the coil 69b of the relay 69 is energized by the second control circuit 5 and the contact 69a is closed, so that the blower 63 is energized. Then, the blower 63 operates. As a result, the air in the nap room flows from the suction port 62 of the case 60 to the case.
It is sucked into 60 and the flat tube 28a of the nap room evaporator 28
Rises along the surface of the storage material pack 29a fixed to the
During this time, the intake air is cooled by the latent heat of fusion of the cold storage material and becomes cool air, and is blown out from the outlet 64 into the napping room 51, and the napping room
Perform 51 air conditioning. That is, when the cooling start switch 68 is turned on (turned on), the cold storage heat of the cold storage material is released to the nap room 51 for the first time. Therefore, the cold storage heat that has been efficiently stored can be released to the nap room 51 as desired by the occupant, and the nap room can be cooled for a long time. When the room temperature of the nap room 51 drops to the set temperature (26 ° C.) while the nap room 51 is being cooled, the power to the relay 69 is cut off based on the detection signal of the temperature sensor 65, and the contact point 69a is opened. Therefore, the blower 63 stops. Thus, the nap room
In accordance with the room temperature of 51, by automatically interrupting the operation of the blower 63, while preventing the nap room 51 from getting too cold,
By maintaining the frozen state of the cold storage material 29 as long as possible, the cooling function of the nap room during parking can be exerted for a longer time. It should be noted that the present invention is not limited to the illustrated embodiment described above, but can be applied to the following modifications. Since there is a correlation between the temperature of the cold storage material in the case 60 and the outer surface temperature of the case 60, the temperature sensor 7 is closely fixed to the outer surface of the case 60 to detect the outer surface temperature of the case 60. Is also good. As shown in FIG. 1, the configuration of the refrigeration cycle is such that a compressor 21 having two suction ports 21e and 21f is used to continuously circulate between the cab side and the nap room side. Showa 59
As disclosed in Japanese Patent No. 50828, a configuration may be adopted in which a solenoid circuit is intermittently opened and closed by a timer circuit so that the refrigerant is alternately circulated to the cab side and the nap room side. As the decompression device on the nap room side, in addition to the constant-pressure expansion valve 27, a combination of a temperature-operated expansion valve, a solenoid valve, a fixed throttle, and the like may be used. In the above embodiment, when the nap room evaporator 28 integrated with the cold storage material pack 29a is installed in the case 60, the meandering direction of the flat tube 28 matches the vertical direction (air flow direction) of the case 60. The nap room evaporator 28 was installed in such a manner that the meandering direction of the flat tube 28a was horizontal (in a direction perpendicular to the air flow).
May be installed. By doing so, the ventilation resistance of the air is reduced. In this case, a plurality of nap room evaporators 28 may be vertically stacked. In the above embodiment, the operation of the blower 63 is automatically interrupted by the detection signal of the temperature sensor 65 that detects the room temperature of the nap room 51. When you can no longer function,
To prevent the blower 63 from being stopped by the detection signal of the temperature sensor 7 or to prevent the in-vehicle battery 1 from being over-discharged, a timer means is provided in the second control circuit 5. The operation of the blower 63 may be automatically stopped by the timer means. In the above embodiment, the driver's cab 50 and the nap room
The case where the present invention is applied to a cooling device for performing cooling of 51 has been described. For example, the present invention relates to cooling of a front seat (driver cab and passenger seat) side of a wagon car (one-box car) and cooling of a rear seat side. The present invention can be similarly applied to a cooling device that performs cooling.

【図面の簡単な説明】第１図は本発明の実施例を示す冷凍サイクル図、第２図
は上記実施例に基づく本発明装置の車両への架装状態を
示す概略図である。第３図は上記実施例における仮眠室
用蒸発器28の詳細図である。図４は、第２冷却ユニット
Ｂの詳細図である。第５図は作動説明用のモリエル線図
である。Ａ……第１冷却ユニット、Ｂ……第２冷却ユニット、25
……蒸発器、26……送風機、28……仮眠室用蒸発器、29
……蓄冷材、50……運転室、51……仮眠室、54……吹出
口、60……ケース、63……送風機BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a refrigeration cycle diagram showing an embodiment of the present invention, and FIG. 2 is a schematic diagram showing a state where a device of the present invention based on the above embodiment is mounted on a vehicle. FIG. 3 is a detailed view of the nap room evaporator 28 in the above embodiment. FIG. 4 is a detailed view of the second cooling unit B. FIG. 5 is a Mollier diagram for explaining the operation. A: first cooling unit, B: second cooling unit, 25
…… Evaporator, 26 …… Blower, 28 …… Nap room evaporator, 29
... cool storage material, 50 ... driver's cab, 51 ... nap room, 54 ... outlet, 60 ... case, 63 ... blower

───────────────────────────────────────────────────── フロントページの続き (56)参考文献特開昭60−261738（ＪＰ，Ａ) 特開昭60−179344（ＪＰ，Ａ) 特開昭60−151138（ＪＰ，Ａ) 特開昭58−211906（ＪＰ，Ａ) 特開昭49−27952（ＪＰ，Ａ) 実開昭59−96515（ＪＰ，Ｕ) 実開昭57−9016（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.⁶，ＤＢ名) B60H 1/32 102 A──────────────────────────────────────────────────続き Continuation of the front page (56) References JP-A-60-261738 (JP, A) JP-A-60-179344 (JP, A) JP-A-60-151138 (JP, A) JP-A-58-58 211906 (JP, A) JP-A-49-27952 (JP, A) JP-A-59-96515 (JP, U) JP-A-57-9016 (JP, U) (58) Fields investigated (Int. ⁶ , DB name) B60H 1/32 102 A

Claims

(57) [Claims] A first evaporator of a refrigerating cycle driven by a vehicle engine, a first blower for blowing air toward the first evaporator, and a first outlet for blowing cold air cooled by the first evaporator into a vehicle interior. A first cooling unit provided to cool the vehicle interior by blowing the cold air into the vehicle interior from the first outlet, a second evaporator provided in the refrigeration cycle, and the refrigeration cycle A case in which at least the second evaporator and the cold storage material are stored so as to be able to store cold by the second evaporator during the operation of the second evaporator, and an air inlet and a second outlet are formed; And a second blower that blows air from the suction port to the second outlet along the cool storage material into the case, and blows cool air from the second outlet to a predetermined area in a vehicle compartment. A second cooling unit provided to cool the predetermined area by discharging the refrigerant, a valve for switching between a state in which the refrigerant of the refrigeration cycle is supplied to the second evaporator and a state in which the refrigerant is not supplied, and the second evaporator Cold storage start instructing means for instructing the supply of the refrigerant to the air conditioner; cooling start instructing means for instructing the start of the second blower; When instructing the supply of the refrigerant to the cooler, controlling the valve so as to supply the refrigerant of the refrigerating cycle to the second evaporator to cool the cold storage material; When the cooling start instructing means instructs the start of the second blower based on the signal,
Cooling control means for driving the second blower to blow cool air from the cold storage material from the second outlet to a predetermined area in the vehicle interior, wherein the case is provided on a side wall portion in the vehicle interior; Is formed in a lower part of a front surface of the case, and the second outlet is formed in an upper part of a front surface of the case. 2. The cold storage start instructing means includes a cold storage switch for selecting between a state in which the refrigerant is supplied to the second evaporator and a state in which the refrigerant is not supplied, and a cold storage temperature sensor for sensing a temperature of the cold storage material. The control means selects a state in which the cold storage switch supplies the refrigerant to the second evaporator based on signals from the cold storage switch and the cold storage temperature sensor, and the cold storage temperature sensor determines that the temperature of the cold storage material is low. 2. The valve according to claim 1, wherein the valve is controlled to supply the refrigerant of the refrigeration cycle to the second evaporator when a state equal to or more than a predetermined value is detected. Vehicle cooling system. 3. The vehicle cooling device according to claim 2, wherein the valve is provided in a refrigerant pipe downstream of the first evaporator constituting the refrigeration cycle. 4. The refrigerant pipe downstream of the second evaporator that constitutes the refrigeration cycle is provided with a check valve for preventing backflow to the second evaporator. 3. The vehicle cooling device according to claim 2. 5. 3. The vehicle according to claim 2, further comprising valve control means for controlling the valve to alternately repeat a state of supplying the refrigerant to the second evaporator and a state of not supplying the refrigerant. For cooling equipment. 6. 3. The vehicle cooling device according to claim 2, wherein the cool storage temperature sensor senses the temperature of the cool storage material located on the refrigerant outlet side of the second evaporator. 7. The second cooling unit is provided with a drain water tray for receiving drain water condensed on the surface of the cold storage material, and a drain pipe for discharging drain water from the drain water tray. 2. The vehicle cooling device according to claim 1. 8. A compressor that compresses and discharges the refrigerant; and a condenser that condenses the refrigerant discharged from the compressor. The first cooling unit includes a first expansion valve that decompresses and expands the refrigerant flowing from the condenser. The second cooling unit is provided with a second expansion valve for reducing and expanding the refrigerant flowing from the condenser, and a state where the refrigerant of the refrigeration cycle is supplied to the second evaporator and not supplied. And a valve for switching between the first evaporator and the second expansion valve when the pressure of the second evaporator falls below a set pressure and the second expansion valve is opened. 2. The vehicle cooling device according to claim 1, wherein the low pressure expansion valve is configured to maintain the pressure of the refrigerant flowing into the evaporator at substantially the set pressure. 9. 9. The vehicle according to claim 8, wherein the first expansion valve is a temperature-operated expansion valve that controls the amount of superheat of the refrigerant downstream of the first evaporator to be substantially constant. Cooling device. 10. A temperature setting unit that sets a set temperature of the predetermined area; and a room temperature sensor that senses a temperature in the vehicle interior. Based on a signal from the room temperature sensor, the temperature of the predetermined area is higher than the set temperature. The cooling device for a vehicle according to claim 1, further comprising: a blower control unit that starts the second blower. 11. The said predetermined | prescribed area is a nap room of a truck, The said 2nd outlet is opening toward the space above the bed of the nap room, The claim 1 characterized by the above-mentioned. Vehicle cooling system. 12. A cold storage temperature sensor that senses the temperature of the cold storage material, a display device that displays the cold storage state of the cold storage material to an occupant, and based on a signal from the cold storage temperature sensor, the cold storage temperature sensor sets the temperature of the cold storage material to 2. The vehicle cooling device according to claim 1, further comprising: display control means for outputting a signal to display the end of cold storage when the display device detects a state equal to or less than a predetermined value. 13. 13. The vehicle cooling device according to claim 12, wherein the display device is provided on an instrument panel on the driver's cab side. 14． The second evaporator is characterized in that a flat tube is formed by bending in a meandering shape, and the regenerator material is arranged so as to contact a surface of a parallel portion of the meandering flat tube. The vehicle cooling device according to claim 1. 15. 15. The cold storage material according to claim 14, wherein the cold storage material is formed as a cold storage pack sealed in a bag body.
The vehicle cooling device according to claim 1. 16. 15. The vehicle cooling device according to claim 14, wherein the cold storage material is sandwiched between mutually facing parallel portions of the meandering flat tube of the second evaporator. 17． 15. The vehicle cooling device according to claim 14, wherein the flat tube of the second evaporator is meandering in a vertical direction.