JPS63279071A - Protective device for compressor for refrigerator - Google Patents
Protective device for compressor for refrigeratorInfo
- Publication number
- JPS63279071A JPS63279071A JP11252287A JP11252287A JPS63279071A JP S63279071 A JPS63279071 A JP S63279071A JP 11252287 A JP11252287 A JP 11252287A JP 11252287 A JP11252287 A JP 11252287A JP S63279071 A JPS63279071 A JP S63279071A
- Authority
- JP
- Japan
- Prior art keywords
- compressor
- refrigerant
- temperature
- switch
- protection device
- 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
Links
- 230000001681 protective effect Effects 0.000 title claims description 3
- 239000003507 refrigerant Substances 0.000 claims description 45
- 238000001514 detection method Methods 0.000 claims description 15
- 238000005057 refrigeration Methods 0.000 description 8
- 230000005284 excitation Effects 0.000 description 6
- 230000007423 decrease Effects 0.000 description 4
- 230000007257 malfunction Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Landscapes
- Control Of Positive-Displacement Pumps (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〕 本発明は冷凍機用圧縮機の保護装置に関し。[Detailed description of the invention] [Industrial application field] The present invention relates to a protection device for a compressor for a refrigerator.
特に冷凍回路中の冷媒不足を検出して冷凍機用圧縮機の
動作を停止させるようＫした保護装置に関する。In particular, the present invention relates to a protection device that detects refrigerant shortage in a refrigeration circuit and stops the operation of a refrigeration compressor.
第３図は車輌用空調装置における従来の保護回路と冷凍
回路とを示す。冷凍機用圧縮機（以下、圧縮機と呼ぶ）
１には車輌のエンジンの動力の一部が電磁クラッチ５を
介して伝達される。FIG. 3 shows a conventional protection circuit and refrigeration circuit in a vehicle air conditioner. Refrigerator compressor (hereinafter referred to as compressor)
A part of the power of the vehicle's engine is transmitted to the electromagnetic clutch 1 via the electromagnetic clutch 5.
すなわち、電磁クラッチ５の励磁コイルが通電されると
、圧縮機１の駆動軸にベルト騒動によるプーリが連結さ
れて回転力が加えられる。電磁クラッチ５の励磁コイル
はイグニションスイッチ２．空調装置の起動スイッチ６
、感温ヒユーズ６を、介して車載のバッテリ４と接続さ
れている。That is, when the excitation coil of the electromagnetic clutch 5 is energized, a pulley caused by belt disturbance is connected to the drive shaft of the compressor 1, and rotational force is applied. The excitation coil of the electromagnetic clutch 5 is connected to the ignition switch 2. Air conditioner start switch 6
, and is connected to an on-vehicle battery 4 via a temperature-sensitive fuse 6.
圧縮機１で圧縮された冷媒は凝縮器８で冷却され、レシ
ーバドライヤ９を経て膨張弁１０で冷媒の一部が気化し
て低温、低圧の液体となる。The refrigerant compressed by the compressor 1 is cooled by a condenser 8, passes through a receiver dryer 9, and is partially vaporized by an expansion valve 10 to become a low-temperature, low-pressure liquid.
次いで、蒸発器１１で車室内空気と熱交換して低圧ガス
となり、圧縮機１の吸入側に戻る。Next, the gas exchanges heat with the air inside the vehicle in the evaporator 11 to become a low-pressure gas, and returns to the suction side of the compressor 1.
冷凍回路中の冷媒量が漏れによって減少してくると、冷
媒と共に循環している潤滑油の圧縮機１への戻りも悪く
なり、異音を発生したり。When the amount of refrigerant in the refrigeration circuit decreases due to leakage, the return of lubricating oil circulating with the refrigerant to the compressor 1 also becomes poor, causing abnormal noise.
焼き付きを生じ易くなる。このため、圧縮機１の吸入側
に第４図に示すような過熱度検出スイッチ１２を設けて
冷媒不足を検出し、検出時に感温ヒユーズ６を作動させ
て電磁クラッチ５の励磁コイルへの電源を遮断して圧縮
機１を停止させるようにしている。この過熱度検出スイ
ッチ１２は、冷凍回路中の冷媒が減少して一定量以下に
なると、冷媒の過熱度を一定になるように調節している
膨張弁１０が弁開度の調節では過熱度の調節ができなく
なり、過熱度は蒸発器１１での熱負荷に比例して大きく
なることを利用している。Burn-in is more likely to occur. For this reason, a superheat detection switch 12 as shown in FIG. 4 is provided on the suction side of the compressor 1 to detect refrigerant shortage, and when detected, the temperature sensitive fuse 6 is activated to supply power to the excitation coil of the electromagnetic clutch 5. The compressor 1 is stopped by shutting off the air. This degree of superheat detection switch 12 detects when the amount of refrigerant in the refrigeration circuit decreases to below a certain amount, and the expansion valve 10, which adjusts the degree of superheat of the refrigerant to a constant level, adjusts the degree of superheat by adjusting the valve opening. This takes advantage of the fact that the degree of superheat increases in proportion to the heat load on the evaporator 11.
具体的に言えば、冷凍回路中の冷媒が漏れにより減少し
て蒸発器１１の出口での冷媒の過熱度が上昇すると、圧
縮機１の吸入側の冷媒の過熱度も上昇する。第４図に示
した過熱度検出スイッチ１２では過熱度の上昇に応じて
感温部名
１３がダイヤフラム１４に膨張させ、このことにより可
動側接点１５が固定側接点１６に接触する。感温ヒユー
ズ６は、第５図に示す通りであり、上記可動側接点１５
と固定側接点１６との接触によりリード線５０と５６と
の間のワイヤヒータ７が通電されて発熱する。このこと
により、金属ケース２１内の溶融ペレット１７が溶ける
と、圧縮状態にあったスプリング１９が導電板１８を押
し上げてワイヤ５２と導電板１８とを離間させる。この
ようにして、ワイヤ５１−金属ケース２１−導電板１８
−ワイヤ５２という電磁クラッチ５の励磁コイルへの通
電経路が遮断され、圧縮機１は停止する。なお、２０は
絶縁ブツシュである。Specifically, when the refrigerant in the refrigeration circuit decreases due to leakage and the degree of superheat of the refrigerant at the outlet of the evaporator 11 increases, the degree of superheat of the refrigerant on the suction side of the compressor 1 also increases. In the superheat degree detection switch 12 shown in FIG. 4, the temperature sensing part 13 causes the diaphragm 14 to expand as the degree of superheat increases, so that the movable contact 15 comes into contact with the fixed contact 16. The temperature-sensitive fuse 6 is as shown in FIG.
The wire heater 7 between the lead wires 50 and 56 is energized by contact with the fixed side contact 16 and generates heat. As a result, when the molten pellet 17 in the metal case 21 melts, the compressed spring 19 pushes up the conductive plate 18 and separates the wire 52 and the conductive plate 18. In this way, wire 51 - metal case 21 - conductive plate 18
- The energizing path of the wire 52 to the excitation coil of the electromagnetic clutch 5 is cut off, and the compressor 1 is stopped. Note that 20 is an insulating bush.
なお、過熱度検出スイッチ１２のオン時点から感温ヒユ
ーズ６の溶断までに時間があるのは。Note that there is a time period from when the superheat degree detection switch 12 is turned on until the temperature-sensitive fuse 6 blows out.
誤動作を防止するためである。すなわ、ち、車輛用空調
装置においては、圧縮機１の冷媒ガスの過熱度は漏れに
よる冷媒量減少の他に、圧縮機１の高速起動時やエンジ
ン回転数の急激な上昇時などに一時的に異常に高くなる
。第６図は正常運転的と冷媒不足時の過熱度特性を示す
。このような一時的な上昇現象に対する誤動作を防止す
るために、過熱度検出スイッチ１２のオンから感温ヒユ
ーズ６の溶断まで遅延時間を持たせている。This is to prevent malfunction. In other words, in a vehicle air conditioner, the degree of superheating of the refrigerant gas in the compressor 1 not only decreases in the amount of refrigerant due to leakage, but also temporarily changes when the compressor 1 starts up at high speed or when the engine speed suddenly increases. becomes abnormally high. FIG. 6 shows the superheat degree characteristics during normal operation and during refrigerant shortage. In order to prevent malfunction due to such a temporary rise phenomenon, a delay time is provided from when the superheat degree detection switch 12 is turned on until the temperature sensitive fuse 6 is blown out.
特別タイプの感温ヒユーズを必要とする。加えて、感温
ヒユーズはワイヤヒータへの通電から溶断までの時間、
すなわち遅延時間が外気温度の変化により変動してしま
うという欠点がある。Requires a special type of temperature sensitive fuse. In addition, temperature-sensitive fuses have a short time between energizing the wire heater and blowing out.
That is, there is a drawback that the delay time fluctuates due to changes in outside temperature.
本発明の目的は冷凍回路の冷媒量不足に対する保護動作
を外気温度の影響を受けることなく確実に実行できる冷
凍機用圧縮機の保護装置を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a protection device for a refrigerator compressor that can reliably perform a protection operation against a shortage of refrigerant in a refrigeration circuit without being affected by outside air temperature.
本発明による保護装置は、冷凍機用圧縮機の冷媒ガス入
口に設けられて冷媒ガスの過熱度を検出するスイッチと
、前記冷凍機用圧縮機の冷媒出口に設けられて冷媒の温
度を検出するスイッチと，前記２つのスイッチがオンし
た時に前記冷凍機用圧縮機を停止させるように構成した
ことを特徴とする。A protection device according to the present invention includes a switch provided at a refrigerant gas inlet of a refrigerator compressor to detect the degree of superheating of the refrigerant gas, and a switch provided at a refrigerant outlet of the refrigerator compressor to detect the temperature of the refrigerant. The compressor for the refrigerating machine is configured to stop when the two switches are turned on.
本発明は、冷凍機用圧縮機の冷媒ガス入口における冷媒
の過熱度が設定値を越える状態が続くと、冷凍機用圧縮
機の冷媒出口の冷媒温度も異常上昇する点に着目したも
のであり、このことにより過熱度検出スイッチのオンと
、温度検出スイッチのオンとの２条件を満足した時のみ
圧縮機を停止させるようにして、一時的な過熱度の上昇
による誤動作を防止するようにしている。The present invention focuses on the fact that if the degree of superheating of the refrigerant at the refrigerant gas inlet of the refrigerator compressor continues to exceed a set value, the refrigerant temperature at the refrigerant outlet of the refrigerator compressor also rises abnormally. As a result, the compressor is stopped only when the two conditions of the superheat detection switch being turned on and the temperature detection switch being turned on are met, thereby preventing malfunctions due to a temporary increase in the superheat degree. There is.
以下に本発明の実施例について図面を参照して説明する
。Embodiments of the present invention will be described below with reference to the drawings.
第１図は本発明を車輌用空調装置に適用した実施例を示
す。車載バッテリに対し、イグニションスイッチ２．空
調装置の起動スイッチ６゜空調温度制御用のサーモアン
プＴＨＡを直列に接続している。サーモアンプＴＥＡの
出力と電磁クラッチの励磁コイルＥＣとの間には、バイ
メタル式の常閉型の温度スイッチ７日と過熱度検出スイ
ッチ１２との並列回路を挿入接続している。温度スイッ
チＴｓは圧縮機の冷媒出口側に設けられ、冷媒己度が異
常上昇してあらかじめ定められた設定値に達するとオン
（開）となる。FIG. 1 shows an embodiment in which the present invention is applied to a vehicle air conditioner. For the vehicle battery, the ignition switch 2. The air conditioner start switch 6° is connected in series with a thermo amplifier THA for controlling the air conditioner temperature. A parallel circuit consisting of a bimetallic normally closed temperature switch 7 and a superheat detection switch 12 is inserted and connected between the output of the thermo amplifier TEA and the excitation coil EC of the electromagnetic clutch. The temperature switch Ts is provided on the refrigerant outlet side of the compressor, and is turned on (opened) when the refrigerant temperature abnormally increases and reaches a predetermined set value.
なお、温度スイッチＴｓの復帰動作温度は零度より低く
設定して、一種の自己保持機能を持たせている。これは
バイメタル式の＠度スイッチＴｓの復帰条件を通常の状
態では起こり得ないように設定するためであり、このこ
とにより温度スイッチＴｓが自動復帰して冷媒不足のま
まで運転が再開されることを防止している。このような
温度スイッチＴｓの復帰操作は９例えば冷媒回路に冷媒
を補充する際に冷媒ガスの一部を大気に放出することで
零度以下の低温状態をつくって実現することができる。Note that the return operation temperature of the temperature switch Ts is set lower than zero degrees to provide a kind of self-holding function. This is to set the return conditions for the bimetallic @ temperature switch Ts so that this would not occur under normal conditions, and as a result, the temperature switch Ts will automatically return and operation will resume even if there is a lack of refrigerant. is prevented. Such a return operation of the temperature switch Ts can be realized, for example, by releasing a portion of the refrigerant gas to the atmosphere when replenishing the refrigerant circuit with refrigerant to create a low temperature state below zero degrees.
別の方法としては、バイメタル式の温度スイッチＴｓ自
体を手動復帰型（これは、車内の操作パネルにおける押
ボタン操作で行うようＫすることもできる。）としても
良い。いずれにしても、一旦温度スイッチＴｓが開とな
った場合には、何らかの操作をしない限り復帰しないよ
うにする必要がある。Alternatively, the bimetallic temperature switch Ts itself may be of a manual reset type (this can also be done by operating a push button on an operation panel inside the vehicle). In any case, once the temperature switch Ts is opened, it is necessary to prevent it from returning unless some kind of operation is performed.
このような構成により、過熱度検出スイッチ１２が圧縮
機１の吸入冷媒ガスの過渡的な過熱度上昇を検知して動
作しても、過渡的な冷媒ガスの過熱度上昇では圧縮機１
の吐出冷媒ガス温度は急激に上昇しないので、＠度スイ
ッチ’ｒｓは動作せず圧縮機１が停止することは無い。With such a configuration, even if the superheat degree detection switch 12 detects a transient increase in the superheat degree of the refrigerant gas sucked into the compressor 1 and operates, the compressor 1
Since the temperature of the discharged refrigerant gas does not rise rapidly, the @ degree switch 'rs does not operate and the compressor 1 does not stop.
しかし、冷媒不足時には吸入冷媒ガスの過熱度上昇と共
に、吐出冷媒ガス温度も上昇するので、圧縮機１に悪影
響を及ぼす前に圧縮機を停止させることができる。However, when there is a refrigerant shortage, the degree of superheating of the suction refrigerant gas increases and the temperature of the discharged refrigerant gas also increases, so the compressor can be stopped before the compressor 1 is adversely affected.
第２図は本発明の第２の実施例を示す。FIG. 2 shows a second embodiment of the invention.
この実施例では、バイメタル式の温度スイッチＴｓとし
て、常開接点ＮＯと常閉接点ＮＯとを有するものを用い
、常開接点ＮＯにはアンプＡｍｐを介して表示ランプＡ
Ｌを接続している。このような構成により、冷媒不足に
より圧縮機１を停止させた場合には、その旨を運転者に
知らせ 。In this embodiment, a bimetallic temperature switch Ts having a normally open contact NO and a normally closed contact NO is used, and the normally open contact NO is connected to an indicator lamp A via an amplifier Amp.
Connecting L. With this configuration, when the compressor 1 is stopped due to refrigerant shortage, the driver is notified of this fact.
ることかできる。このことにより、運転者は空調装置停
止の原因を知ることができ、速やかに冷媒補充の行動を
とることができる。I can do that. This allows the driver to know the cause of the air conditioner stopping, and to promptly take action to replenish the refrigerant.
なお２本発明は実施例に限定されるものではない。例え
ば、温度スイッチＴｓはバイメタル式のものに限定され
るものではなく９手動復帰型の温度スイッチであれば良
い。また、車輌用空調装置に限らず冷凍機用の冷媒圧縮
機全般に適用できる。Note that the present invention is not limited to the examples. For example, the temperature switch Ts is not limited to a bimetal type, but may be a 9-manual reset type temperature switch. Furthermore, the present invention is applicable not only to vehicle air conditioners but also to refrigerant compressors for refrigerators in general.
以上説明してきたように９本発明では冷媒不足時の圧縮
機の停止条件を圧縮機吸入側の冷媒ガス過熱度と圧縮機
吐出側の冷媒ガス＠度とで決めたことにより、外気温度
の影響を受けることなく確実に保護動作を行うことがで
きる。しかも１本発明では従来のような感温ヒユーズは
不用であり、保護動作毎に部品を交換するというような
作業を省略できる。As explained above, in the present invention, the conditions for stopping the compressor when there is a refrigerant shortage are determined by the degree of superheating of the refrigerant gas on the suction side of the compressor and the degree of superheating of the refrigerant gas on the discharge side of the compressor. Protective operation can be performed reliably without being affected by damage. Moreover, the present invention does not require a conventional temperature-sensitive fuse, and the work of replacing parts every time a protection operation is performed can be omitted.
第１図、第２図はそれぞれ９本発明の第１゜第２の実施
例のブロック図、第３図は従来の冷凍回路とその保護回
路を示し、第４図は過熱度検出スイッチの断面図、第５
図は感温ヒユーズの断面図、第６図は冷媒ガスの過熱度
の時間変化を正常の場合と冷媒ガス不足時とについて示
した図。
図中、１は圧縮機、２はイグニションスイッチ、６は起
動スイッチ、ＴＨＡはサーモアンプ。
１日は温度スイッチ、１２は過熱度検出スイッチ。
ＥＣは電磁クラッチの励磁コイル、 ＡＬは表示ランプ
。
第１図
第２図
第３図
第６図
圧縮機起動Figures 1 and 2 are block diagrams of the first and second embodiments of the present invention, Figure 3 shows a conventional refrigeration circuit and its protection circuit, and Figure 4 is a cross-section of a superheat detection switch. Figure, 5th
The figure is a cross-sectional view of a temperature-sensitive fuse, and FIG. 6 is a diagram showing temporal changes in the degree of superheating of refrigerant gas in a normal case and in a case where refrigerant gas is insufficient. In the figure, 1 is a compressor, 2 is an ignition switch, 6 is a start switch, and THA is a thermoamplifier. 1st is a temperature switch, 12 is a superheat degree detection switch. EC is the excitation coil of the electromagnetic clutch, AL is the indicator lamp. Figure 1 Figure 2 Figure 3 Figure 6 Compressor startup
Claims (4)
ガスの過熱度を検出するスイッチと，前記冷凍機用圧縮
機の冷媒出口に設けられて冷媒の温度を検出するスイッ
チとを含み，前記２つのスイッチがオンした時に前記冷
凍機用圧縮機を停止させるように構成したことを特徴と
する冷凍機用圧縮機の保護装置。1. a switch provided at the refrigerant gas inlet of the refrigerator compressor to detect the degree of superheating of the refrigerant gas; and a switch provided at the refrigerant outlet of the refrigerator compressor to detect the temperature of the refrigerant; 1. A protection device for a refrigerator compressor, characterized in that said refrigerator compressor is configured to be stopped when one switch is turned on.
前記温度検出スイッチの復帰動作温度を零度より低く設
定したことを特徴とする冷凍機用圧縮機の保護装置。2. In the protection device according to claim 1,
A protection device for a compressor for a refrigerator, characterized in that a return operation temperature of the temperature detection switch is set lower than zero degrees.
前記温度検出スイッチは手動復帰スイッチ式であること
を特徴とする冷凍機用圧縮機の保護装置。3. In the protection device according to claim 1,
A protection device for a refrigerating machine compressor, wherein the temperature detection switch is of a manual return switch type.
前記温度検出スイッチは常開及び常閉の切替え接点を有
し，前記常開側接点は該温度検出スイッチが動作したこ
とを告知する警告手段に給電するよう接続されているこ
とを特徴とする冷凍機用圧縮機の保護装置。4. In the protection device according to claim 1,
The temperature detection switch has a normally open and normally closed switching contact, and the normally open contact is connected to supply power to a warning means for notifying that the temperature detection switch has been activated. Protective device for machine compressors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11252287A JPS63279071A (en) | 1987-05-11 | 1987-05-11 | Protective device for compressor for refrigerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11252287A JPS63279071A (en) | 1987-05-11 | 1987-05-11 | Protective device for compressor for refrigerator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63279071A true JPS63279071A (en) | 1988-11-16 |
Family
ID=14588749
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11252287A Pending JPS63279071A (en) | 1987-05-11 | 1987-05-11 | Protective device for compressor for refrigerator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63279071A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010015829A (en) * | 2008-07-03 | 2010-01-21 | Asahi Keiki Kk | Plug |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57153176A (en) * | 1981-03-16 | 1982-09-21 | Mitsubishi Electric Corp | Controller for refrigerating plant |
| JPS59100374A (en) * | 1982-11-30 | 1984-06-09 | 日産自動車株式会社 | Air cooling device for car |
-
1987
- 1987-05-11 JP JP11252287A patent/JPS63279071A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57153176A (en) * | 1981-03-16 | 1982-09-21 | Mitsubishi Electric Corp | Controller for refrigerating plant |
| JPS59100374A (en) * | 1982-11-30 | 1984-06-09 | 日産自動車株式会社 | Air cooling device for car |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010015829A (en) * | 2008-07-03 | 2010-01-21 | Asahi Keiki Kk | Plug |
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