JPS6117878A - Preventive device for over-encapsulation of refrigerant - Google Patents

Preventive device for over-encapsulation of refrigerant

Info

Publication number
JPS6117878A
JPS6117878A JP13946584A JP13946584A JPS6117878A JP S6117878 A JPS6117878 A JP S6117878A JP 13946584 A JP13946584 A JP 13946584A JP 13946584 A JP13946584 A JP 13946584A JP S6117878 A JPS6117878 A JP S6117878A
Authority
JP
Japan
Prior art keywords
refrigerant
liquid
compressor
circuit
electromagnetic clutch
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP13946584A
Other languages
Japanese (ja)
Inventor
坂本 秀行
多田 栄治
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nissan Motor Co Ltd
Original Assignee
Nissan Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Priority to JP13946584A priority Critical patent/JPS6117878A/en
Publication of JPS6117878A publication Critical patent/JPS6117878A/en
Pending legal-status Critical Current

Links

Landscapes

  • Injection Moulding Of Plastics Or The Like (AREA)
  • Cable Accessories (AREA)
  • Encapsulation Of And Coatings For Semiconductor Or Solid State Devices (AREA)

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】 産業上の利用分野 本発明は自動車用冷房装置を始めとして、各穐冷房装置
に供・して好適な冷媒過封入防止装置に関する。
DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a refrigerant overfill prevention device suitable for use in various types of air conditioners, including automobile air conditioners.

従来の技、術 自動車用冷房装置は完成車両に仮組付けされる関係上、
冷房装置を構成する各種機能部品を車両に搭載した後に
機関をアイドリンク運転した状態で冷凍系に冷媒を封入
するようにしている。この冷媒封入時点では冷媒が過封
入でるるか否かを判定することは難かしく、専ら作業者
がリキッドタンクあるいは冷媒通路に配設したサイトグ
ラスで冷媒の状態を見ながら勘によって封入しているの
が現状でめる。従って、冷媒の過封入状態は実際に車両
を走行して冷房装置を所要時間作動して発見される場会
が多いのであるが、一般のドライバーでは冷媒過封入を
知る手交ては全くない。
Conventional techniques and techniques Due to the fact that automotive cooling systems are temporarily assembled into completed vehicles,
After various functional parts constituting the cooling system are mounted on the vehicle, refrigerant is sealed in the refrigeration system while the engine is operated in idle link mode. At the time of charging the refrigerant, it is difficult to judge whether or not the refrigerant is overfilled, and the operator only fills the refrigerant based on intuition while observing the state of the refrigerant through a sight glass installed in the liquid tank or refrigerant passage. This is the current situation. Therefore, the overfilling of refrigerant is often discovered by actually driving the vehicle and operating the cooling system for the required period of time, but the average driver has no way of knowing if the refrigerant is overfilling.

発明が解決しようとする問題点 このため、冷媒が過封入されていると、冷凍すイクルで
液相冷媒がリキッドタンクから溢れ出てコンデンサ内に
溜まってしまい、コンデンサの正常な放熱作用が阻薔さ
れてここで冷媒の温度があまり低下せず、サイクル全体
の冷凍能力が小さくなって冷房の利きが低下してしまう
のみならず、コンプレッサにリキッドバックしてコンプ
レッサ全破損してしまう不具合があった。
Problem to be Solved by the Invention For this reason, if the refrigerant is overfilled, the liquid phase refrigerant will overflow from the liquid tank during the freezing cycle and accumulate in the condenser, preventing the condenser's normal heat dissipation function. At this point, the refrigerant temperature does not drop much, reducing the refrigerating capacity of the entire cycle and reducing the effectiveness of the air conditioner, as well as liquid backing into the compressor, causing complete damage to the compressor. .

一方、実公昭47−14303号公報に示されているよ
うに、冷媒の気液状態における熱容量の変化を利用して
、リキッドタンク内の液冷媒量を2つの特性の異なる半
導体素子の電気信号により検出してメータで指標し得る
ようにしたものが提案されているが、当該装置では冷媒
量を矧るだけで、冷媒過封入防止手段とはなシ得ない。
On the other hand, as shown in Japanese Utility Model Publication No. 47-14303, the amount of liquid refrigerant in a liquid tank is controlled by electrical signals from two semiconductor elements with different characteristics, by utilizing the change in heat capacity of refrigerant in the gas-liquid state. Although a device has been proposed that can detect the amount of refrigerant and indicate it with a meter, this device only measures the amount of refrigerant and cannot be used as a means to prevent overfilling of refrigerant.

そこで、本発明は冷媒封入時に確実に過封入を防止する
ことができる冷媒過封入防止装置を提供するものである
Therefore, the present invention provides a refrigerant overfill prevention device that can reliably prevent overfilling when refrigerant is charged.

問題点を解決するための手段 本発明にあっては、リキッドタンクに配設した液位セン
サの検出作用にもとづいて作動する警報回路金膜けると
共に、コンプレッサの電磁クラッチ作動回路に、前記警
報回路の作動にょシ該電磁クラッチ作動回路を開成する
制御スイッチ金弁装しである。
Means for Solving the Problems In the present invention, an alarm circuit that operates based on the detection action of a liquid level sensor disposed in a liquid tank is provided with a gold film, and an electromagnetic clutch operating circuit of the compressor is provided with the alarm circuit. During operation, a control switch is installed to open the electromagnetic clutch operating circuit.

作用 冷媒の封入により IJキッドタンク内の冷媒液位が所
定レベールとなると液位センサが検出作用し。
When the liquid level of the refrigerant in the IJ kid tank reaches a predetermined level due to the filling of the refrigerant, the liquid level sensor detects it.

−報回路を作動して警報を行うと同時に、制御スイッチ
をオフ作動し、コンプレッサの−tmクラッチ作動回路
を開成して冷凍サイクルの稼kIthを停止し、それ以
上の冷媒封入を阻止する。
- At the same time, the control switch is activated to issue an alarm, and the -tm clutch activation circuit of the compressor is opened to stop the operation of the refrigeration cycle and prevent further refrigerant from being enclosed.

実施例 以下、本発明の実施例を図面と共に詳述する。Example Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

第1図において、1はリキッドタンクで、このリキッド
タンク1に冷媒封入によってタンク内の液相冷媒の液位
が所定レベルとなると感知作用して警報回路2を作動す
る液位センサ3を配設しである。この警報回路2はバッ
テリ4.操作スイツチ5.液位センサ3および警告灯6
の直列回路からなってお夛、この警報回路6には更に後
述する制御スイッチ作動用の常開リレー7を接続しであ
る。−前記操作スイッチ5は、コンプレッサ8を駆動し
て行う冷媒封入に先立ってオン操作するもので、冷媒の
封入によ51Jキツドタンク1内の液相冷媒の液位が土
性して所定液位となると、液位センサ3がこれを速かに
感知し、警報回路2を閉成作動して、警告灯6を点灯し
、同時に常開リレー7をオン作動させる8 tた、コンプレッサ8の電磁クラッチ9の作動回路10
には、前記警報回路2の作動、具体的には常開リレー7
のオン作動により、該電磁クラッチ作動回路10を開放
する制WJスイツチ11を介装しである。本実施例では
この制御スイッチ11として常閉リレーを用いている。
In FIG. 1, 1 is a liquid tank, and a liquid level sensor 3 is installed in the liquid tank 1 to detect when the liquid level of the liquid phase refrigerant in the tank reaches a predetermined level by filling the refrigerant and activate an alarm circuit 2. It is. This alarm circuit 2 is connected to a battery 4. Operation switch5. Liquid level sensor 3 and warning light 6
This alarm circuit 6 is further connected to a normally open relay 7 for operating a control switch, which will be described later. - The operation switch 5 is turned on prior to charging the refrigerant by driving the compressor 8, and when the refrigerant is charged, the liquid level of the liquid refrigerant in the 51J hard tank 1 rises to a predetermined level. When this happens, the liquid level sensor 3 quickly detects this, closes the alarm circuit 2, turns on the warning light 6, and at the same time turns on the normally open relay 7. 9 operating circuit 10
, the operation of the alarm circuit 2, specifically the normally open relay 7.
A control WJ switch 11 is provided which opens the electromagnetic clutch actuating circuit 10 when turned on. In this embodiment, a normally closed relay is used as the control switch 11.

以上の実施例構造によれば、冷媒封入によってリキッド
タンク1内の液相冷媒の液位が所定レベルとなると、液
位センサ3の感知作用によ#)W告灯6が点灯すると同
時に常開リレー7がオン作動し、この常開リレー7の作
動によって常閉リレー11がオフ作動して電磁クラッチ
作動回路lot−開成する。この結果、コンプレッサ8
の駆動が停止して、それ以上の冷媒封入を阻止して、冷
媒の過封入を防止することができる。また、電磁クラッ
チ9は周知のようにエバポン−夕の出口温度を検出する
温度センサ(何れも図示省略)の検出作用により断、続
作動するようになっているが、温度センサの作用により
電磁クラッチ9が“断“と゛なってコンプレッサ8が停
止しても、リキッドタンク1円の冷媒液位が所定レベル
に至ってなければ警告灯6が点灯しないので、作業者が
誤認により冷媒封入が児了していないのにも拘わらず冷
凍サイクルの駆動を停止してしまうの全回避することが
できる。
According to the structure of the embodiment described above, when the liquid level of the liquid phase refrigerant in the liquid tank 1 reaches a predetermined level due to refrigerant filling, the W notification light 6 lights up due to the sensing action of the liquid level sensor 3, and at the same time it is normally opened. The relay 7 is turned on, and the normally open relay 7 is turned off, which causes the normally closed relay 11 to be turned off, opening the electromagnetic clutch operation circuit. As a result, compressor 8
The drive of the refrigerant is stopped to prevent further refrigerant from being filled in, thereby preventing over-filling of refrigerant. Furthermore, as is well known, the electromagnetic clutch 9 is operated on and off by the detection action of a temperature sensor (both not shown) that detects the outlet temperature of the evaporator. Even if the compressor 8 is stopped due to the refrigerant 9 being cut off, the warning light 6 will not light up unless the refrigerant level in the liquid tank reaches a predetermined level. It is possible to completely avoid stopping the operation of the refrigeration cycle even though the operation is not completed.

第2図に示す実施例は、警報回路2の操作スイッチ5と
して、冷媒通路12に設けた冷媒封入用のサービスバル
ブ13に1感圧スイツチ14を設けである。この感圧ス
イッチ14は、例えばサービスパルプ13のケーシング
15上端而に配設した固定接点14aと、ケーシング1
5上側にヌプリング17により弾装された冷媒充填器挿
入ガイド16下面に配設した可動接点14tlとからな
り、冷媒充填器18を挿入ガイド16に挿入してサービ
スバルブ13に押圧、嵌合することにより、接点14a
、44b’i投入するようになっている。
In the embodiment shown in FIG. 2, one pressure-sensitive switch 14 is provided as the operating switch 5 of the alarm circuit 2 in a service valve 13 for charging refrigerant provided in a refrigerant passage 12. This pressure-sensitive switch 14 includes, for example, a fixed contact 14a disposed above the casing 15 of the service pulp 13, and a fixed contact 14a disposed above the casing 15 of the service pulp 13.
5 consists of a refrigerant charger insertion guide 16 which is elastically mounted on the upper side by a nupling 17 and a movable contact 14tl arranged on the lower surface, and the refrigerant charger 18 is inserted into the insertion guide 16 and pressed and fitted to the service valve 13. Accordingly, the contact 14a
, 44b'i are input.

従って、この実施例によれば、冷媒充填器18をサービ
スパルプ13に抑圧、@合することにより自動的にオン
作動するので、スイッチの投入し忘れを生じることがな
く、冷媒過封入防止をよジ確芙に行うことができる。
Therefore, according to this embodiment, since the refrigerant charger 18 is automatically turned on by being compressed and connected to the service pulp 13, there is no need to forget to turn on the switch, and the refrigerant overfilling can be prevented. You can do it for sure.

発明の効果 以上のように本発明によれば、リキッドタンク内の液相
冷媒が所定量になると警報回路が作動して作業者にその
旨を報らせることかできると同時に、コンプレッサの電
磁クラッチ作動回路を開成するため、コンプレッサが直
ちに停止してそれ以上の冷媒封入を阻止するため、冷媒
の過封入を確実に防止することができ、のって、冷媒過
封入に起因する冷凍能力の低下やコンプレッサの破損を
未然に防止することができるという実用上多大な効果を
有する。
Effects of the Invention As described above, according to the present invention, when the liquid phase refrigerant in the liquid tank reaches a predetermined amount, an alarm circuit is activated to notify the operator of this fact, and at the same time, the electromagnetic clutch of the compressor can be activated. Since the operating circuit is opened, the compressor immediately stops and prevents any further refrigerant from being filled in, making it possible to reliably prevent refrigerant from being overfilled. This has a great practical effect of being able to prevent damage to the compressor and compressor.

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

第1図は本発明の一実施例を示す略示的系統図、第2崗
は警報回路の操作スイッチの異なる例を示す断面図であ
る。 1・・・リキッドタンク、2・・・警報回路、3・・・
液位センサ、8・・・コンプレッサ、9・・・電磁クラ
ッチ、10・・・電磁クラッチ作動回路、11・・・制
御スイッチ。 外2名
FIG. 1 is a schematic system diagram showing one embodiment of the present invention, and the second diagram is a sectional view showing different examples of operation switches of the alarm circuit. 1...Liquid tank, 2...Alarm circuit, 3...
Liquid level sensor, 8... Compressor, 9... Electromagnetic clutch, 10... Electromagnetic clutch operating circuit, 11... Control switch. 2 people outside

Claims (1)

【特許請求の範囲】[Claims] (1)リキツドタンクに配設した液位センサの検出作用
にもとづいて作動する警報回路を設けると共に、コンプ
レツサの電磁クラツチ作動回路に、前記警報回路の作動
により該電磁クラツチ作動回路を開成する制御スイツチ
を弁装したことを特徴とする冷媒過封入防止装置。
(1) An alarm circuit is provided which operates based on the detection action of a liquid level sensor installed in the liquid tank, and a control switch is provided in the electromagnetic clutch operating circuit of the compressor to open the electromagnetic clutch operating circuit upon activation of the alarm circuit. A refrigerant overfill prevention device characterized by a valve.
JP13946584A 1984-07-05 1984-07-05 Preventive device for over-encapsulation of refrigerant Pending JPS6117878A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13946584A JPS6117878A (en) 1984-07-05 1984-07-05 Preventive device for over-encapsulation of refrigerant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13946584A JPS6117878A (en) 1984-07-05 1984-07-05 Preventive device for over-encapsulation of refrigerant

Publications (1)

Publication Number Publication Date
JPS6117878A true JPS6117878A (en) 1986-01-25

Family

ID=15245862

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13946584A Pending JPS6117878A (en) 1984-07-05 1984-07-05 Preventive device for over-encapsulation of refrigerant

Country Status (1)

Country Link
JP (1) JPS6117878A (en)

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