JPH0615938B2 - Air conditioner - Google Patents
Air conditionerInfo
- Publication number
- JPH0615938B2 JPH0615938B2 JP58065479A JP6547983A JPH0615938B2 JP H0615938 B2 JPH0615938 B2 JP H0615938B2 JP 58065479 A JP58065479 A JP 58065479A JP 6547983 A JP6547983 A JP 6547983A JP H0615938 B2 JPH0615938 B2 JP H0615938B2
- Authority
- JP
- Japan
- Prior art keywords
- compressor
- temperature
- variable speed
- air conditioner
- current
- 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 - Lifetime
Links
Landscapes
- Air Filters, Heat-Exchange Apparatuses, And Housings Of Air-Conditioning Units (AREA)
- Control Of Ac Motors In General (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Description
【発明の詳細な説明】 〔発明の利用分野〕 本発明は圧縮機駆動用のモータを回転数可変制御する容
量制御形の空気調和装置に係り、特に圧縮機の異常温度
上昇に対する保護方式に関するものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a capacity control type air conditioner for variably controlling the rotation speed of a compressor driving motor, and more particularly to a protection method against abnormal temperature rise of the compressor. Is.
従来本発明者が開発検討した上記保護方式を第１図にて
説明する。第１図は圧縮機駆動回路の制御ブロック図で
ある。電源１により給電された電力は、保護スイッチ２
を介して整流部３で整流される。整流された直流電力は
インバータ部５で再び交流化されて、可変速モータ６に
供給される。可変速モータ６の回転数の制御は電流セン
サ４により取り込まれた直流電流及びインバータ部５と
出力電圧に応じて制御部８で行なわれる。即ち、電流セ
ンサ４は、所定の電流値以上になったら回転数を低下せ
しめる。また上記出力電圧は、圧縮機回転数を検出する
ための信号として、制御部８にとり込んでいるものであ
る。以上の容量制御形の空気調和機における冷媒ガス洩
れ等の異常時には、圧縮機の温度が上昇し可変速モータ
６を損ねる恐れがあるので、温度センサ７により圧縮機
本体の温度を検出して保護スイッチ２をオフする様にな
っている。温度センサ７と保護スイッチ２は普通一体に
なったバイメタルスイッチが用い易く、これを圧縮機表
面に取付けてるが、圧縮機の可変速モータ６に流れる大
きな電流が流れるため、保護スイッチ２は大きなものに
なり、高価になっている。また、温度センサ７および保
護スイッチ２は圧縮機表面に取付けていることと大きな
電流を流すための太い配線が必要であることから、配線
処理が煩雑になっている。The above-mentioned protection method developed and studied by the present inventor will be described with reference to FIG. FIG. 1 is a control block diagram of a compressor drive circuit. The power supplied by the power supply 1 is supplied to the protection switch 2
Is rectified by the rectification unit 3 via. The rectified DC power is converted into AC again by the inverter unit 5 and supplied to the variable speed motor 6. The control of the rotation speed of the variable speed motor 6 is performed by the control unit 8 according to the DC current taken by the current sensor 4, the inverter unit 5 and the output voltage. That is, the current sensor 4 lowers the rotation speed when the current value exceeds a predetermined current value. The output voltage is taken into the controller 8 as a signal for detecting the compressor speed. When there is an abnormality such as refrigerant gas leakage in the above capacity control type air conditioner, the temperature of the compressor may rise and the variable speed motor 6 may be damaged. Therefore, the temperature sensor 7 detects the temperature of the compressor body to protect it. Switch 2 is turned off. The temperature sensor 7 and the protection switch 2 are normally integrated bimetal switches, and they are mounted on the surface of the compressor. However, since a large current flows through the variable speed motor 6 of the compressor, the protection switch 2 is large. It has become expensive. Further, since the temperature sensor 7 and the protection switch 2 are mounted on the surface of the compressor and thick wiring for passing a large current is required, wiring processing is complicated.
本発明は、上記問題点を解決すべくなされたもので、冷
媒洩れ等による圧縮機の異常温度上昇を防止する簡単な
保護回路を提供することにある。The present invention has been made to solve the above problems, and an object of the present invention is to provide a simple protection circuit for preventing an abnormal temperature rise of a compressor due to refrigerant leakage or the like.
本発明は、可変速モータを用いた容量制御形空気調和装
置では、インバータ部５に、スイッチ機能を持つ半導体
スイッチを使っている。という特異性に着目して、発明
されたものである。According to the present invention, in the capacity control type air conditioner using the variable speed motor, the inverter section 5 uses a semiconductor switch having a switch function. It was invented paying attention to the peculiarity.
以下、本発明の一実施例を第２図により説明する。第２
図は、圧縮機駆動回路の制御ブロック図であり、同一機
能のブロックには、従来回路と同一の符号を付した。本
実施例では、温度センサ７にはサーミスタを用いてお
り、制御部８も温度取込端子Ｓを追加してある。基本動
作は、従来回路と同様であるので省略する。冷媒ガス洩
れ等の原因で圧縮機温度が通常時よりも高い温度に上昇
すると温度センサ７の信号を受けて、制御部８よりイン
バータ部５へ伝達する信号を停止する。この停止保護機
能は、空調負荷に応じて変化するインバータ部５の入力
電流に応じて可変速制御される可変速モータ６の運転、
停止にかかわらず行なわる様になっているので、第１図
に於ける保護スイッチ２と温度センサ７とに代用でき
る。An embodiment of the present invention will be described below with reference to FIG. Second
The figure is a control block diagram of the compressor drive circuit, and blocks having the same function are denoted by the same reference numerals as those in the conventional circuit. In the present embodiment, a thermistor is used as the temperature sensor 7, and the control unit 8 is additionally provided with the temperature taking-in terminal S. The basic operation is the same as that of the conventional circuit, and therefore its description is omitted. When the compressor temperature rises to a temperature higher than the normal temperature due to a refrigerant gas leak or the like, the signal from the temperature sensor 7 is received and the signal transmitted from the control unit 8 to the inverter unit 5 is stopped. The stop protection function is to operate the variable speed motor 6 that is variable speed controlled according to the input current of the inverter unit 5 that changes according to the air conditioning load,
Since the operation is performed regardless of the stop, the protection switch 2 and the temperature sensor 7 in FIG. 1 can be substituted.
本実施例によれば、温度センサ７としてサーミスタ等の
信号用素子を用い、その信号を制御部８に取り込みイン
バータ部５を、圧縮機温度に応じてオン、オフするだけ
で、圧縮機の異常温度上昇を避けることができるので、
高価な保護スイッチ２を除去できると共に圧縮機への配
線処理が、温度センサ７への信号線で良いため簡単にな
る。According to the present embodiment, a signal element such as a thermistor is used as the temperature sensor 7, and the signal is taken into the control unit 8 and the inverter unit 5 is turned on / off according to the compressor temperature. You can avoid the temperature rise,
The expensive protection switch 2 can be removed, and the wiring process to the compressor can be simplified because the signal line to the temperature sensor 7 is sufficient.
本発明の空気調和装置は、圧縮機の表面温度の高低に応
じた信号を発生する温度センサが圧縮機の温度が通常時
よりも高くなった信号を出力すると、これを受けた制御
部が電流センサの検出電流の大きに関係なくインバータ
部への信号伝送を停止するので、保護スイッチを必要と
することなく圧縮機の可変速モータが停止して圧縮機の
異常温度上昇を避けることができる。また、大きく高価
な保護スイッチを除去できると共にに、保護スイッチを
除去できることにより圧縮機への配線処理が簡単にな
る。In the air conditioner of the present invention, when the temperature sensor that generates a signal according to the level of the surface temperature of the compressor outputs a signal indicating that the temperature of the compressor is higher than the normal time, the control unit that receives the signal outputs the Since the signal transmission to the inverter unit is stopped regardless of the magnitude of the current detected by the sensor, the variable speed motor of the compressor can be stopped and the abnormal temperature rise of the compressor can be avoided without requiring a protection switch. Further, the large and expensive protection switch can be removed, and since the protection switch can be removed, wiring processing to the compressor is simplified.
第１図は、従来本発明者が開発検討した圧縮機駆動回路
の制御ブロック図、第２図は、本発明の圧縮機駆動回路
の制御ブロック図である。 １……電源、２……保護スイッチ、３……整流部、４…
…電流センサ、５……インバータ部、６……可変速モー
タ、７……温度センサ、８……制御部。FIG. 1 is a control block diagram of a compressor drive circuit conventionally developed and studied by the present inventor, and FIG. 2 is a control block diagram of a compressor drive circuit of the present invention. 1 ... Power supply, 2 ... Protection switch, 3 ... Rectifier, 4 ...
... current sensor, 5 ... inverter section, 6 ... variable speed motor, 7 ... temperature sensor, 8 ... control section.
Claims (1)
ンバータ部の入力電流を検出する電流センサと、 上記電流センサの検出電流の大きさに応じた信号を上記
インバータ部へ伝達して上記モータを可変速制御する制
御部とを有する空気調和装置において、 上記圧縮機の表面温度の高低に応じた信号を発生する温
度センサを備え、 上記制御部は、上記温度センサから圧縮機の温度が通常
時温度よりも高くなった信号を受けると上記電流センサ
の検出電流の大きさに関係なく上記インバータ部への信
号伝送を停止することを特徴とする空気調和装置。1. A current sensor for detecting an input current of an inverter section for variable speed control of a variable speed motor of a compressor, and a signal according to a magnitude of a detected current of the current sensor is transmitted to the inverter section. In an air conditioner having a control unit that controls the motor at a variable speed, a temperature sensor that generates a signal according to whether the surface temperature of the compressor is high or low is provided. An air conditioner characterized by stopping signal transmission to the inverter section irrespective of the magnitude of the detected current of the current sensor when receiving a signal having a temperature higher than normal temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58065479A JPH0615938B2 (en) | 1983-04-15 | 1983-04-15 | Air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58065479A JPH0615938B2 (en) | 1983-04-15 | 1983-04-15 | Air conditioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59191858A JPS59191858A (en) | 1984-10-31 |
| JPH0615938B2 true JPH0615938B2 (en) | 1994-03-02 |
Family
ID=13288270
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58065479A Expired - Lifetime JPH0615938B2 (en) | 1983-04-15 | 1983-04-15 | Air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0615938B2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54163054U (en) * | 1978-05-04 | 1979-11-15 |
-
1983
- 1983-04-15 JP JP58065479A patent/JPH0615938B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59191858A (en) | 1984-10-31 |
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