JPS6311347Y2 - - Google Patents
Info
- Publication number
- JPS6311347Y2 JPS6311347Y2 JP15849878U JP15849878U JPS6311347Y2 JP S6311347 Y2 JPS6311347 Y2 JP S6311347Y2 JP 15849878 U JP15849878 U JP 15849878U JP 15849878 U JP15849878 U JP 15849878U JP S6311347 Y2 JPS6311347 Y2 JP S6311347Y2
- Authority
- JP
- Japan
- Prior art keywords
- compressor
- temperature
- electric
- characteristic thermistor
- detection circuit
- 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
- 238000001514 detection method Methods 0.000 claims description 10
- 239000003507 refrigerant Substances 0.000 claims description 4
- 235000003642 hunger Nutrition 0.000 description 3
- 230000037351 starvation Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
Description
【考案の詳細な説明】
本案は電動圧縮機の保護装置に関するもので、
圧縮機のガス欠運転を防止することを目的とす
る。[Detailed explanation of the invention] This invention relates to a protection device for an electric compressor.
The purpose is to prevent the compressor from running out of gas.
一般に吸込冷媒ガスにより冷却を行う所謂サク
シヨンクール方式の電動圧縮機においては、冷媒
ガスがリークしガス欠運転状態に陥いると、電動
機の巻線温度が上昇し、その結果巻線が焼損して
圧縮機の運転ができなくなる。 In general, in so-called suction cool type electric compressors that are cooled by suction refrigerant gas, if refrigerant gas leaks and the motor runs out of gas, the temperature of the motor windings increases, resulting in burnout of the windings. The compressor will not be able to operate.
本案は上記の点に鑑みてなされたもので以下図
に示す実施例について説明する。 This proposal has been made in view of the above points, and the embodiment shown in the drawings will be described below.
1は運転スイツチ、2は停止スイツチ、3は圧
縮機用電磁開閉器、4は温度検出回路5からの入
力信号により作動するスイツチング回路でこれら
を接続して電動圧縮機6の運転制御回路を構成す
ると共に前記圧縮機用電磁開閉器3の第1接点3
aは前記運転スイツチ1に並列に接続され、また
第2接点3bは限時タイマー7に直列に接続され
ている。 1 is an operation switch, 2 is a stop switch, 3 is an electromagnetic switch for the compressor, and 4 is a switching circuit operated by an input signal from the temperature detection circuit 5. These are connected to form an operation control circuit for the electric compressor 6. At the same time, the first contact 3 of the compressor electromagnetic switch 3
A is connected in parallel to the operation switch 1, and a second contact 3b is connected in series to the timer 7.
而して前記温度検出回路5は、電動圧縮機1の
吐出マフラー8の温度を感知する負特性サーミス
タ9と電動機コイル10の温度を感知する正特性
サーミスタ11を直列に接続すると共に前記負特
性サーミスタ9には限時タイマー7の常閉接点で
あるタイマー接点7aが並列に設けられている。 The temperature detection circuit 5 has a negative characteristic thermistor 9 that senses the temperature of the discharge muffler 8 of the electric compressor 1 and a positive characteristic thermistor 11 that senses the temperature of the motor coil 10 connected in series. 9 is provided in parallel with a timer contact 7a which is a normally closed contact of the timer 7.
次に上記の構成においてその動作を説明する。 Next, the operation of the above configuration will be explained.
イ 通常の運転時
まず始動時には吐出マフラー8の温度を感知す
る負特性サーミスタ9は限時タイマー7のタイマ
ー接点7aにより予め短絡されているために温度
検出回路5の抵抗値は小さく、運転スイツチ1を
閉じるとスイツチング回路4はON状態であるか
ら圧縮機用電磁開閉器3は励磁されその第1接点
3a及び第2接点3bはいずれも閉路し、電動圧
縮機6は運転を開始する。開始後一定時間経過す
ると限時タイマー7によりタイマー接点7aが開
くが、この時点では吐出マフラー8の温度が上昇
しているから負特性サーミスタ9の抵抗は減少
し、また電動機コイル10の温度も低く温度検出
回路5の抵抗値は小でありスイツチング回路4は
ON状態を持続し電動圧縮機6は通常の運転を行
う。B. During normal operation First, when starting, the negative characteristic thermistor 9 that senses the temperature of the discharge muffler 8 is short-circuited in advance by the timer contact 7a of the timer 7, so the resistance value of the temperature detection circuit 5 is small, and the resistance value of the temperature detection circuit 5 is small. When closed, the switching circuit 4 is in the ON state, so the compressor electromagnetic switch 3 is excited, its first contact 3a and second contact 3b are both closed, and the electric compressor 6 starts operating. After a certain period of time has elapsed after the start, the timer contact 7a is opened by the timer 7, but at this point the temperature of the discharge muffler 8 has risen, so the resistance of the negative characteristic thermistor 9 decreases, and the temperature of the motor coil 10 is also low. The resistance value of the detection circuit 5 is small, and the switching circuit 4 is
The electric compressor 6 maintains the ON state and performs normal operation.
ロ ガス欠運転時
冷媒ガスのリークによりガス欠状態に陥いると
吐出マフラー8の温度が低下すると共に電動機コ
イル10の温度は上昇し、前記両サーミスタ9,
11の抵抗はいずれも高くなり、温度検出回路5
の抵抗値は大となり、その結果スイツチング回路
4はOFF状態になり電動圧縮機6の運転は停止
される。これにより電動機コイル10の焼損は防
止出来前記電動圧縮機6は保護される。尚電動圧
縮機6はスイツチング回路4に関連させてもよい
し或は限時タイマー7に並列に設けてもよい。(b) During gas starvation operation When a gas starvation condition occurs due to a refrigerant gas leak, the temperature of the discharge muffler 8 decreases and the temperature of the motor coil 10 rises, causing both the thermistors 9,
All the resistances of 11 become high, and the temperature detection circuit 5
The resistance value becomes large, and as a result, the switching circuit 4 is turned off and the operation of the electric compressor 6 is stopped. This prevents the motor coil 10 from burning out and protects the electric compressor 6. The electric compressor 6 may be associated with the switching circuit 4 or may be provided in parallel with the timer 7.
本案は上述の如く、吐出マフラーを有する圧縮
機と、この圧縮機を駆動する電動機とを備え、こ
の電動機を温度検出回路からの信号で制御する電
動圧縮機において、前記温度検出回路は吐出マフ
ラーの温度を感知する負特性サーミスタと電動機
コイルの温度を感知する正特性サーミスタとを直
列に設けると共に前記負特性サーミスタに始動時
閉路するタイマー接点を並列に設けてなるもので
あるから、ガス欠運転による電動機の焼損は未然
に防止され電動圧縮機は安全に保護される。 As described above, the present invention is an electric compressor that includes a compressor having a discharge muffler and an electric motor that drives this compressor, and controls this electric motor by a signal from a temperature detection circuit. A negative characteristic thermistor that senses the temperature and a positive characteristic thermistor that senses the temperature of the motor coil are provided in series, and a timer contact that closes at startup is provided in parallel with the negative characteristic thermistor, so that there is no risk of gas starvation due to operation. Burnout of the electric motor is prevented and the electric compressor is safely protected.
第1図は本案保護装置の一実施例を示す電気回
路図、第2図は電動圧縮機の要部切欠せる正面
図、第3図はサーミスタの特性図である。
4……スイツチング回路、5……温度検出回
路、9……負特性サーミスタ、11……正特性サ
ーミスタ、7a……タイマー接点、8……吐出マ
フラー、10……電動機コイル。
FIG. 1 is an electric circuit diagram showing one embodiment of the present protection device, FIG. 2 is a cutaway front view of the main parts of an electric compressor, and FIG. 3 is a characteristic diagram of a thermistor. 4...Switching circuit, 5...Temperature detection circuit, 9...Negative characteristic thermistor, 11...Positive characteristic thermistor, 7a...Timer contact, 8...Discharge muffler, 10...Motor coil.
Claims (1)
駆動する電動機とを備え、この電動機を介して圧
縮機に吸込冷媒ガスを導くと共に、電動機を温度
検出回路からの信号で制御する電動圧縮機におい
て、前記温度検出回路は吐出マフラーの温度を感
知する負特性サーミスタと電動機コイルの温度を
感知する正特性サーミスタとを直列に設けると共
に前記負特性サーミスタに始動時閉路するタイマ
ー接点を並列に設けてなることを特徴とする電動
圧縮機の保護装置。 An electric compressor that includes a compressor having a discharge muffler and an electric motor that drives the compressor, guides suction refrigerant gas to the compressor via the electric motor, and controls the electric motor with a signal from a temperature detection circuit, The temperature detection circuit includes a negative characteristic thermistor that senses the temperature of the discharge muffler and a positive characteristic thermistor that senses the temperature of the motor coil, which are connected in series, and a timer contact that closes at the time of starting is connected to the negative characteristic thermistor in parallel. A protection device for electric compressors featuring:
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15849878U JPS6311347Y2 (en) | 1978-11-15 | 1978-11-15 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15849878U JPS6311347Y2 (en) | 1978-11-15 | 1978-11-15 |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5573571U JPS5573571U (en) | 1980-05-21 |
JPS6311347Y2 true JPS6311347Y2 (en) | 1988-04-02 |
Family
ID=29150420
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15849878U Expired JPS6311347Y2 (en) | 1978-11-15 | 1978-11-15 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6311347Y2 (en) |
-
1978
- 1978-11-15 JP JP15849878U patent/JPS6311347Y2/ja not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS5573571U (en) | 1980-05-21 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3312081A (en) | Control apparatus for refrigeration system | |
JPH05328767A (en) | Starting circuit of single-phase ac induction motor | |
JPS6311347Y2 (en) | ||
JPS5847267Y2 (en) | Refrigeration equipment | |
US4017778A (en) | Motor protection circuit | |
JPH0755267A (en) | Air conditioner | |
KR920004908Y1 (en) | Circuit for preventing liquid compression for air conditioner compressor | |
JPH027414Y2 (en) | ||
JPS5950037B2 (en) | Defrost control system for refrigeration equipment | |
JPS6141994Y2 (en) | ||
US4027221A (en) | Control circuit with time delay | |
JPS5830511B2 (en) | Air conditioner control device | |
JPH04198642A (en) | Control device for ventilation fan | |
JPS6031401Y2 (en) | Electric motor overload protection device | |
JPS5837Y2 (en) | Air-cooled heat pump type air conditioner | |
JPS61217667A (en) | Refrigerating unit | |
JPH025254Y2 (en) | ||
JPS6143081Y2 (en) | ||
JPS6233489Y2 (en) | ||
JPS6015235B2 (en) | Refrigeration equipment with internal temperature display device | |
JPS6179934A (en) | Operation starting device for indoor side fan | |
JPS5933944Y2 (en) | Refrigerator control device | |
JPS6020668B2 (en) | Cooling system control device | |
JPH0245512Y2 (en) | ||
JPH02169983A (en) | Cooking apparatus |