JPH0349037B2 - - Google Patents
Info
- Publication number
- JPH0349037B2 JPH0349037B2 JP19001784A JP19001784A JPH0349037B2 JP H0349037 B2 JPH0349037 B2 JP H0349037B2 JP 19001784 A JP19001784 A JP 19001784A JP 19001784 A JP19001784 A JP 19001784A JP H0349037 B2 JPH0349037 B2 JP H0349037B2
- Authority
- JP
- Japan
- Prior art keywords
- refrigerant
- valve
- liquid level
- level sensor
- liquid
- 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.)
- Expired
Links
- 239000007788 liquid Substances 0.000 claims description 57
- 239000003507 refrigerant Substances 0.000 claims description 53
- 238000001514 detection method Methods 0.000 claims description 10
- 230000002265 prevention Effects 0.000 claims description 4
- 239000007791 liquid phase Substances 0.000 description 7
- 238000001816 cooling Methods 0.000 description 6
- 230000007423 decrease Effects 0.000 description 4
- 238000005057 refrigeration Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Landscapes
- Cable Accessories (AREA)
- Air-Conditioning For Vehicles (AREA)
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、各種
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 Industrial Application The present invention relates to a refrigerant overfill prevention device suitable for use in various types of cooling devices including automobile cooling devices.
従来の技術
自動車用冷房装置は完成車両に後組付けされる
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グ運転した状態
で冷凍系に冷媒を封入するようにしている。この
冷媒過封入時点では冷媒が過封入であるか否かを
判定することは難かしく、専ら作業者がリキツド
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つて封入している
のが現状である。Prior Art Since automotive cooling systems are assembled into completed vehicles, refrigerant is charged into the refrigeration system while the engine is idling after the various functional parts that make up the cooling system are mounted on the vehicle. There is. At this point in time, it is difficult to determine whether or not refrigerant has been overfilled, and the operator must fill in the refrigerant by intuition while observing the condition of the refrigerant using a sight glass installed in the liquid tank or refrigerant passage. The current situation is that
従つて、冷媒の過封入状態は実際に車両を走行
して冷房装置を所定時間作動して発見される場合
が多いのであるが、一般のドライバーでは冷媒過
封入を知る手立ては全くない。 Therefore, although refrigerant overfilling is often discovered by actually driving the vehicle and operating the cooling system for a predetermined period of time, the average driver has no way of knowing whether 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、冷凍サ
イクルで液相冷媒がリキツドタンクから溢れ出て
コンデンサ内に溜まつてしまい、コンデンサの正
常な放熱作用が阻害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
なつて冷房の利きが低下してしまうのみならず、
コンプレツサにリキツドバツクしてコンプレツサ
を破損してしまう不具合があつた。Problems to be Solved by the Invention For this reason, if refrigerant is overfilled, liquid phase refrigerant will overflow from the liquid tank during the refrigeration cycle and accumulate in the condenser, impeding the normal heat dissipation function of the condenser. At this point, the temperature of the refrigerant does not decrease much, and the refrigerating capacity of the entire cycle decreases, which not only reduces the effectiveness of the air conditioner, but also
There was a problem where the compressor was damaged due to liquid backing up.
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、リキツ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知るだけで、冷
媒過封入防止装置とはなり得ない。 On the other hand, as shown in Japanese Utility Model Publication No. 47-14303, the amount of liquid refrigerant in a liquid tank is detected by electrical signals from two semiconductor elements with different characteristics, using the change in heat capacity of the refrigerant in its gas-liquid state. Although a device has been proposed in which the amount of refrigerant can be measured using a meter, this device only knows the amount of refrigerant and cannot be used as a refrigerant overfill prevention device.
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
本発明にあつては、冷媒通路に配設したサービ
スバルブに開閉弁を配設する一方、リキツドタン
クにタンク内冷媒液が所定液位となると感知作動
する液位センサを設けて、該液位センサの検出作
用にもとずいて前記開閉弁にバツテリ電圧を引加
して該開閉弁を閉弁する開閉弁作動回路を形成
し、かつ、該開閉弁作動回路に前記液位センサと
並列に接続されて、該液位センサの検出信号を入
力してこの液位センサの検出作用解除後にあつて
も、開閉弁の閉成状態を保持する自己保持回路を
付設してある。Means for Solving the Problems In the present invention, an on-off valve is provided in the service valve provided in the refrigerant passage, and a liquid level sensor is provided in the liquid tank that detects and operates when the refrigerant liquid in the tank reaches a predetermined level. is provided to form an on-off valve operating circuit that applies a battery voltage to the on-off valve to close the on-off valve based on the detection action of the liquid level sensor, and in the on-off valve operating circuit. A self-holding circuit is connected in parallel with the liquid level sensor and inputs the detection signal of the liquid level sensor to maintain the closed state of the on-off valve even after the detection action of the liquid level sensor is canceled. There is.
作 用
冷媒の封入によりリキツドタンク内の冷媒液位
が所定レベルとなると液位センサが検出作用し、
開閉弁作動回路を閉成して開閉弁を閉弁作用させ
てそれ以上の冷媒封入を防止する。開閉弁作動回
路の閉成は自己保持回路によつて保持され、コン
プレツサ回転数低下に伴う冷媒液位低下によつ
て、液位センサの検出作用が解除されても開閉弁
の閉弁状態を保持する。Function When the refrigerant level in the liquid tank reaches a predetermined level due to refrigerant filling, the liquid level sensor detects the level.
The on-off valve operation circuit is closed to cause the on-off valve to close and prevent further refrigerant from being enclosed. The closed state of the on-off valve operation circuit is maintained by a self-holding circuit, and even if the detection action of the liquid level sensor is canceled due to a drop in the refrigerant liquid level as the compressor rotation speed decreases, the on-off valve remains closed. do.
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図においては、１は冷媒通路２に配設した
サービスバルブで、該サービスバルブ１には後述
する液位センサ５の感知作動により閉弁作動され
る開閉弁３を配設してある。この開閉弁３として
は、例えば液位センサ５のオン作動によりバツテ
リ７電圧が励磁コイル３ｂに印加されて弁体３ａ
を閉弁作動する常開型の電磁弁が用いられてい
る。 In FIG. 1, reference numeral 1 denotes a service valve disposed in a refrigerant passage 2, and the service valve 1 is provided with an on-off valve 3 which is closed by sensing operation of a liquid level sensor 5, which will be described later. As for this on-off valve 3, for example, when the liquid level sensor 5 is turned on, a battery 7 voltage is applied to the excitation coil 3b, and the valve body 3a is turned on.
A normally open solenoid valve is used that closes the valve.
４はリキツドタンクで、このリキツドタンク４
に冷媒封入によつてタンク内の液相冷媒が所定液
位、具体的には適正封入量範囲の上限に相当する
液位となると感知作動する液位センサ５を設けて
ある。本実施例ではこの液位センサ５として公知
のフロート．スイツチタイプのセンサを用いてお
り、フロートガイド５ｂに遊装したフロート５ａ
が所定液位まで上昇すると、該フロート５ａに配
設したマグネツトによりフロートガイド５ｂ内に
組込んだ接点を投入するようになつている（マグ
ネツト、接点は何れも図示省略）。 4 is a liquid tank, this liquid tank 4
A liquid level sensor 5 is provided which senses and operates when the liquid phase refrigerant in the tank reaches a predetermined liquid level, specifically, the liquid level corresponds to the upper limit of the appropriate filling amount range. In this embodiment, the liquid level sensor 5 is a known float. A switch type sensor is used, and the float 5a is attached to the float guide 5b.
When the liquid level rises to a predetermined level, a magnet disposed on the float 5a inserts a contact built into the float guide 5b (both the magnet and the contact are not shown).
６は前記液位センサ５の検出作用にもとづいて
前記電磁弁３を閉弁作動する開閉弁作動回路を示
し、該作動回路はバツテリ７、イグニツシヨンス
イツチ８、エアコンスイツチ９、液位センサ５の
直列回路で構成されている。この作動回路６は更
に具体的には第２図に示すように、液位センサ５
のオン作動により接点を投入する制御リレー１
０，１１，１２を備えている。制御リレー１１は
２つの常開接点１１ａ，１１ｂを有しており、該
制御リレー１１には一方の接点１１ｂが投入され
ることにより接点を投入するリレー１３を接続し
て、前記液位センサ５と並列な自己保持回路１４
を構成している。第１図中３ｃは弁体３ａのセツ
トスプリング、１５，１６，１７，１８はそれぞ
れシールリングを示す。 Reference numeral 6 indicates an on-off valve operation circuit that closes the solenoid valve 3 based on the detection action of the liquid level sensor 5, and this operation circuit includes a battery 7, an ignition switch 8, an air conditioner switch 9, and a liquid level sensor 5. It consists of a series circuit. More specifically, this operating circuit 6 includes a liquid level sensor 5 as shown in FIG.
Control relay 1 that closes the contact when turned on.
0, 11, and 12. The control relay 11 has two normally open contacts 11a and 11b, and a relay 13 is connected to the control relay 11, which closes the contact when one of the contacts 11b is closed. self-holding circuit 14 in parallel with
It consists of In FIG. 1, 3c indicates a set spring for the valve body 3a, and 15, 16, 17, and 18 each indicate a seal ring.
以上の実施例装置によれば、冷媒封入によつて
リキツドタンク４内の液相冷媒の液位が所定レベ
ルになると、液位センサ５がこれを速かに感知し
てオン作動し、制御リレー１０，１１，１２の各
接点を投入して電磁弁を敏速に閉弁作動させる。
この結果、サービスバルブ１からのそれ以上の冷
媒封入を阻止して、冷媒の過封入を確実に防止す
る。前記液位センサ５がオン作動して制御リレー
１１の接点１１ｂが投入されると、リレー１３ｂ
も接点を投入して自己保持回路１４を閉成する。 According to the above embodiment device, when the liquid level of the liquid phase refrigerant in the liquid tank 4 reaches a predetermined level due to refrigerant filling, the liquid level sensor 5 quickly senses this and turns on, and the control relay 10 , 11 and 12 are closed to quickly close the solenoid valve.
As a result, further injection of refrigerant from the service valve 1 is prevented, and excessive injection of refrigerant is reliably prevented. When the liquid level sensor 5 is turned on and the contact 11b of the control relay 11 is closed, the relay 13b is turned on.
The self-holding circuit 14 is closed by closing the contact.
ここで、前述のリキツドタンク４内の液相冷媒
の液位変化を考察すると、冷媒系内に一定量の冷
媒を封入してあつても、コンプレツサの回転数が
増大すると比例的に液位が上昇する。 Here, considering the change in the liquid level of the liquid phase refrigerant in the liquid tank 4 mentioned above, even if a certain amount of refrigerant is sealed in the refrigerant system, the liquid level increases proportionally as the rotation speed of the compressor increases. do.
従つて、前述の冷媒封入作業に際して、コンプ
レツサを所定な低回転で、例えば、自動車冷房装
置の場合のように、機関をアイドリング運転状態
にしてコンプレツサを一定の低回転にして行う場
合には、冷凍系内の冷媒が適正封入量範囲の上限
になると、リキツドタンク４内の液相冷媒の液位
が所定レベルとなつて前述のように液位センサ５
がこれを感知して電磁弁３を速かに閉弁作動して
冷媒の過封入を防止する。 Therefore, when the above-mentioned refrigerant filling operation is performed with the compressor running at a predetermined low rotation speed, for example, in the case of an automobile cooling system, when the engine is idling and the compressor is running at a constant low rotation speed, it is necessary to When the refrigerant in the system reaches the upper limit of the appropriate filling amount range, the liquid level of the liquid phase refrigerant in the liquid tank 4 reaches a predetermined level, and the liquid level sensor 5 is activated as described above.
senses this and quickly closes the solenoid valve 3 to prevent overfilling of refrigerant.
一方、冷媒封入作業時間の短縮のために、作業
者が機関回転数を高めてコンプレツサを所定回転
数以上の高回転にして冷媒封入を行つた場合、冷
凍系内の冷媒が適正封入量範囲の下限側にあつて
も、リキツドタンク４内の液相冷媒の液位が所定
レベルとなり、液位センサ５の検出作用にもとづ
いて電磁弁３を閉弁作動させてそれ以上の冷媒封
入を阻止する。この時、前述のように液位センサ
５のオン作動によつて自己保持回路１４が閉成す
るため、その後コンプレツサの回転数が低下し
て、リキツドタンク４内の液位が所定レベル以下
となつて、液位センサ５がオン作動しても、電磁
弁３を閉弁させたままとするため、冷媒が再び封
入され始めることはない。従つて電磁弁３は、少
なくとも必要最小限の冷媒が封入された後で一旦
閉弁すると再び開弁することがなく、作業者は、
電磁弁３の閉弁作業を即ち、冷媒封入作業の終了
として迷わず判断することができる。 On the other hand, in order to shorten the refrigerant filling work time, if the operator increases the engine speed and rotates the compressor at a high speed above the predetermined speed to perform refrigerant filling, the refrigerant in the refrigeration system may fall within the appropriate amount range. Even if it is on the lower limit side, the liquid level of the liquid phase refrigerant in the liquid tank 4 reaches a predetermined level, and based on the detection action of the liquid level sensor 5, the solenoid valve 3 is operated to close to prevent further refrigerant from being enclosed. At this time, as mentioned above, the self-holding circuit 14 is closed due to the ON operation of the liquid level sensor 5, so the rotation speed of the compressor decreases and the liquid level in the liquid tank 4 falls below a predetermined level. Even if the liquid level sensor 5 is turned on, the solenoid valve 3 remains closed, so the refrigerant does not start to be filled again. Therefore, once the solenoid valve 3 is closed after being filled with at least the minimum amount of refrigerant required, it will not be opened again.
It is possible to determine without hesitation that the closing operation of the solenoid valve 3 is the end of the refrigerant filling operation.
なお、前記実施例では開閉弁として常開型の電
磁弁を開示したが、この他、負圧源負圧の導入に
よつて閉弁作動する所謂常開型のダイヤフラム弁
を用いることも可能である。 In the above embodiment, a normally open solenoid valve is disclosed as the on-off valve, but it is also possible to use a so-called normally open diaphragm valve that is closed by introducing negative pressure from a negative pressure source. be.
発明の効果
以上のように本発明によれば、冷媒封入時にリ
キツドタンク内の液相冷媒が適正量になると、サ
ービスバルブに配設した開閉弁が即時に閉弁作動
するので、冷媒の過封入を確実に防止することが
でき、仍つて、冷媒過封入に起因する冷凍能力の
低下やコンプレツ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 the appropriate amount during refrigerant filling, the on-off valve disposed in the service valve immediately closes, thereby preventing overfilling of refrigerant. This can be reliably prevented, and has a great practical effect of being able to prevent a reduction in refrigerating capacity and damage to the compressor due to overfilling of refrigerant.
第１図は本発明の一実施例の要部を示す断面
図、第２図は開閉弁作動回路図である。
１……サービスバルブ、２……冷媒通路、３…
…開閉弁、４……リキツドタンク、５……液位セ
ンサ、６……開閉弁作動回路、１４……自己保持
回路。
FIG. 1 is a sectional view showing a main part of an embodiment of the present invention, and FIG. 2 is an on-off valve operating circuit diagram. 1...Service valve, 2...Refrigerant passage, 3...
...Opening/closing valve, 4...Liquid tank, 5...Liquid level sensor, 6...Opening/closing valve operating circuit, 14...Self-holding circuit.
Claims (1)
を配設する一方、リキツドタンクにタンク内冷媒
液が所定液位となると感知作動する液位センサを
設けて、該液位センサの検出作用にもとずいて前
記開閉弁にバツテリ電圧を印加して該開閉弁を閉
弁する開閉弁作動回路を形成し、かつ、該開閉弁
作動回路に前記液位センサと並列に接続されて、
該液位センサの検出信号を入力してこの液位セン
サの検出作用解除後にあつても、開閉弁の閉成状
態を保持する自己保持回路を付与したことを特徴
とする冷媒過封入防止装置。1. An on-off valve is provided in the service valve provided in the refrigerant passage, and a liquid level sensor is provided in the liquid tank that detects and operates when the refrigerant liquid in the tank reaches a predetermined level, and the detection function of the liquid level sensor is based on the detection function of the liquid tank. forming an on-off valve operation circuit that applies a battery voltage to the on-off valve to close the on-off valve, and is connected in parallel to the liquid level sensor to the on-off valve operation circuit;
A refrigerant overfill prevention device comprising a self-holding circuit that maintains a closed state of an on-off valve even after the detection signal of the liquid level sensor is input and the detection action of the liquid level sensor is canceled.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19001784A JPS6170358A (en) | 1984-09-11 | 1984-09-11 | Refrigerant over-encapsulation preventive device |
| US06/748,474 US4601177A (en) | 1984-06-26 | 1985-06-25 | Refrigerant over-charging checking system of closed circuit refrigeration air cooling system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19001784A JPS6170358A (en) | 1984-09-11 | 1984-09-11 | Refrigerant over-encapsulation preventive device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6170358A JPS6170358A (en) | 1986-04-11 |
| JPH0349037B2 true JPH0349037B2 (en) | 1991-07-26 |
Family
ID=16250980
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19001784A Granted JPS6170358A (en) | 1984-06-26 | 1984-09-11 | Refrigerant over-encapsulation preventive device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6170358A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0511184Y2 (en) * | 1988-06-08 | 1993-03-18 |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04100573U (en) * | 1991-01-29 | 1992-08-31 | ||
| JP4547331B2 (en) | 2005-12-28 | 2010-09-22 | パナソニック株式会社 | Lighting device and metal vapor discharge lamp |
-
1984
- 1984-09-11 JP JP19001784A patent/JPS6170358A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0511184Y2 (en) * | 1988-06-08 | 1993-03-18 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6170358A (en) | 1986-04-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2006103677A (en) | Valve assembly and oil supply sensor | |
| EP0663873B1 (en) | Method and device for diagnosis of the refrigerant quantity in an air conditioning system | |
| JPH08291771A (en) | Self-diagnosis device using pressure sensor | |
| JP3669305B2 (en) | Fuel vapor gas processing equipment | |
| US5046924A (en) | Process and circuit arrangement for controlling a consumer driven by an internal combustion engine | |
| KR20020013737A (en) | Detecting vapor leakage in a motor vehicle fuel system | |
| JPH0349037B2 (en) | ||
| US4601177A (en) | Refrigerant over-charging checking system of closed circuit refrigeration air cooling system | |
| JPH0539414Y2 (en) | ||
| US4285207A (en) | Air conditioning apparatus comprising refrigerant shortage sensor | |
| JPS61252463A (en) | Refrigerant over-sealing preventive device | |
| US5918476A (en) | Replacement kit for vehicle air conditioning circuit pressure operable valves | |
| KR20020044223A (en) | Method for error detection of fuel level sensor in a vehicle | |
| EP1186840B1 (en) | A method and a system for monitoring the state of filling of a motor-vehicle air-conditioning system | |
| JPS6117878A (en) | Preventive device for over-encapsulation of refrigerant | |
| JPS61105067A (en) | Preventive device for over-encapsulation of refrigerant | |
| JPS6117876A (en) | Alarm device for over-encapsulation of refrigerant | |
| JPH0219393B2 (en) | ||
| US6642841B2 (en) | Engine protecting apparatus for vehicle | |
| JPS61105068A (en) | Preventive device for over-encapsulation of refrigerant | |
| JPS6170357A (en) | Detector for quantity of refrigerant encapsulated | |
| JPS61250473A (en) | Refrigerant over-sealing preventive device | |
| JPS61250474A (en) | Refrigerant over-sealing preventive device | |
| JPS6117877A (en) | Alarm device for over-encapsulation of refrigerant | |
| JPS62131168A (en) | Detector for quantity of refrigerant sealed |