JPS6373064A - Protective device for compressor for refrigerator - Google Patents
Protective device for compressor for refrigeratorInfo
- Publication number
- JPS6373064A JPS6373064A JP21762486A JP21762486A JPS6373064A JP S6373064 A JPS6373064 A JP S6373064A JP 21762486 A JP21762486 A JP 21762486A JP 21762486 A JP21762486 A JP 21762486A JP S6373064 A JPS6373064 A JP S6373064A
- Authority
- JP
- Japan
- Prior art keywords
- compressor
- superheat
- circuit
- degree
- refrigerator
- 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 4
- 239000003507 refrigerant Substances 0.000 claims description 24
- 238000001514 detection method Methods 0.000 claims description 21
- 239000003990 capacitor Substances 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 5
- 238000007664 blowing Methods 0.000 claims description 2
- 230000001934 delay Effects 0.000 claims description 2
- 230000007423 decrease Effects 0.000 description 9
- 230000005284 excitation Effects 0.000 description 9
- 238000005057 refrigeration Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000004378 air conditioning 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
- 238000012423 maintenance Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Landscapes
- Devices That Are Associated With Refrigeration Equipment (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) [Abstract] 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８機の保護装置に関し、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
させるようにした保護装置に関する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a protection device for a compressor for a refrigerator, and in particular, a device for detecting a refrigerant shortage in a refrigeration circuit and stopping the operation of a compressor for a refrigerator. related to protective equipment.
第３図は車輛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。FIG. 3 shows a conventional protection circuit and refrigeration circuit in a vehicle air conditioner. Refrigerator compressor (hereinafter referred to as
圧縮機と呼ぶ）１には軍備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。すなわち、電磁クラ
ッチ５の励磁コイルが通電されると。A part of the power of the military engine is transmitted to the compressor 1 via an electromagnetic clutch 5. That is, when the excitation coil of the electromagnetic clutch 5 is energized.
圧縮機１の冨動軸にベルト駆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３．
感温ヒユーズ６を介して車代のバッテリ４と接続されて
いる。A belt-driven pulley is connected to the dynamic shaft of the compressor 1 to apply rotational force. The excitation coil of the electromagnetic clutch 5 is connected to the ignition switch 2. Air conditioner start switch 3.
It is connected to the battery 4 of the car via a temperature sensitive fuse 6.
圧縮機１で圧縮された冷媒は凝１蒲器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。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シ、圧ｍ磯１の吸入
側に戻る。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. 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 pressure m iso 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への戻シも悪く
なシ、異音を発生したり、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
感温ヒーーズ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ば、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シ、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。When the amount of refrigerant in the refrigeration circuit decreases due to leakage, the return of lubricating oil circulating together with the refrigerant to the compressor 1 becomes difficult, and abnormal noise and seizure are 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 heater 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. When the amount of refrigerant in the refrigeration circuit decreases below a certain level, the expansion valve 10, which adjusts the degree of superheating of the refrigerant to a constant level, changes the degree of superheating by adjusting the valve opening. This method 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シ減少し
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ｉ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
感温筒１３がダイヤフラム１４を膨張させ、このことに
よシ可動側接点１５が固定側接点１６に接続する。感温
ヒユーズ６は、第５図に示す通りであシ、上記可動側接
点１５と固定側接点１６との接触により ＩＪ−ド線５
０と５３との間のワイヤヒータ７が通電されて発熱する
。このことによシ、金属ケース２１内の溶融ペレット１
７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。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 i-heat degree 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 cylinder 13 expands the diaphragm 14 in response to an increase in the degree of superheat, thereby connecting the movable side contact 15 to the fixed side contact 16. The temperature-sensitive fuse 6 is as shown in FIG.
The wire heater 7 between 0 and 53 is energized and generates heat. Due to this, the molten pellet 1 inside the metal case 21
7 melts, the compressed spring 19 pushes up the conductive plate 18 and separates the wire 52 from the conductive plate 18. In this way, the wire 51-metal case 21-
The energizing path from the conductive plate 18 to the wire 52 to the excitation coil of the electromagnetic clutch 5 is cut off, and the compressor 1 is stopped.
なお、２０は絶縁ブツシュである。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、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の高速禽
起動時やエンジン回転数の急激％上昇時などに一時的に
異常に高くなる。このような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。The reason why there is a time period from when the superheat degree detection switch 12 is turned on until the temperature-sensitive fuse 6 blows out is to prevent malfunctions. 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 is started at high speed or when the engine speed suddenly increases by %. becomes abnormally high. In order to prevent malfunction due to such a 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.
しかしながら、上述した形式の保獲装置は、＃別タイプ
の感温ヒユーズを必要とする。加えて。However, the type of capture device described above requires a different type of temperature sensitive fuse. In addition.
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力して
しまうという欠点がある。A temperature-sensitive fuse has a drawback in that the time from energization to the wire heater until it blows out, that is, the delay time, varies depending on 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設動作
を外気温度の影響をできるだけ小さくして実行させるこ
とにある。An object of the present invention is to perform a maintenance operation in response to a shortage of refrigerant in a refrigeration circuit while minimizing the influence of outside air temperature.
〔間、１点を解決するための手段〕
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ｎて冷媒ガスの過熱度を検出するスイッチと
、該過熱度検出スイッチからの信号を一定時間遅延させ
る回路と、該遅延回路からの出力によって導通して前記
冷凍機用圧縮機のオン、オフを規定する電源回路に挿入
された電流ヒユーズを溶断させるためのトランジスタ回
路とを備えたことを特徴とする。[Means for Solving the Problem] The protection device according to the present invention includes a switch that is installed at the refrigerant gas inlet of a refrigerator compressor to detect the degree of superheat of the refrigerant gas, and a switch that detects the degree of superheat from the degree of superheat detection switch. a circuit that delays a signal for a certain period of time, and a transistor circuit that is made conductive by the output from the delay circuit and blows out a current fuse inserted in a power supply circuit that regulates on/off of the refrigerator compressor. It is characterized by having
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図は車輛用空調装置における本発明の第１の実施例
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３．空調温度制御用の温度サ
ーモＴＨＣ、電流ヒユーズＣＨ，電磁りラッ≠の励磁コ
イルＥＣとを直列に接続している。励磁コイルＥＣに並
列に・ぐワートランジスタＰＴのコレクターエミッタを
接続している。温度サーモＴＨＣの出力は２つに分岐さ
れ。FIG. 1 shows a first embodiment of the present invention in a vehicle air conditioner. Ignition switch 2 for the car battery
．． Air conditioner start switch 3. A temperature thermostat THC for air conditioning temperature control, a current fuse CH, and an electromagnetic excitation coil EC are connected in series. The collector emitter of the excitation transistor PT is connected in parallel to the excitation coil EC. The output of the temperature thermostat THC is branched into two.
一方が電流ヒユーズＣＨに、他方は過熱度検出スイッチ
１２にそれぞれ接続されている。過熱度検出スイッチ１
２には抵抗器Ｒ１が接続され、これらの接続点には抵抗
器Ｒ２とコンデンサＣ１とによる充放電回路が接続され
ている。充放電回路の出力ば・ぐワートランジスタＰＴ
のペースに接続されている。なお、過熱度検出スイッチ
１２は、従来同様。One side is connected to the current fuse CH, and the other side is connected to the superheat degree detection switch 12. Superheat detection switch 1
2 is connected to a resistor R1, and a charging/discharging circuit including a resistor R2 and a capacitor C1 is connected to the connection point of these. Charge/discharge circuit output transistor PT
Connected to the pace of. Note that the superheat degree detection switch 12 is the same as the conventional one.
圧縮機の冷媒ガス入口側に設置される。Installed on the refrigerant gas inlet side of the compressor.
過熱度検出スイッチ１２は、冷凍回路内の冷媒量が減少
して冷媒ガスの過熱度が設定値を越えるとオンとなる。The degree of superheat detection switch 12 is turned on when the amount of refrigerant in the refrigeration circuit decreases and the degree of superheat of the refrigerant gas exceeds a set value.
ここで、温度サーモＴＨＣがオン状態にあれば、抵抗器
Ｒ２を通してコンデンサＣ１に充電電流が流れ始め、Ａ
点電位が所定値に達した時点でパワートランジスタＰＴ
は導通する。このことにより、電流ヒユーズＣＨには大
電流が流れて溶断し、励磁コイルＥＣへの通電が遮断さ
れて圧縮機は停止する。Here, if the temperature thermostat THC is in the on state, a charging current starts flowing to the capacitor C1 through the resistor R2, and A
When the point potential reaches a predetermined value, the power transistor PT
is conductive. As a result, a large current flows through the current fuse CH and blows it out, cutting off the current supply to the excitation coil EC and stopping the compressor.
なお、過渡的な現象によシ冷媒の過熱度が一旦上昇し、
Ａ点電位が所定値に達する前に冷媒の過熱度が低下して
過熱度検出スイッチ１２がオフとなった場合、コンデン
サＣは抵抗器Ｒ２とＲ４とを介して放電し、初期状態に
戻る。Note that due to a transient phenomenon, the degree of superheating of the refrigerant increases once,
If the degree of superheat of the refrigerant decreases and the degree of superheat detection switch 12 is turned off before the potential at point A reaches a predetermined value, the capacitor C is discharged via the resistors R2 and R4 and returns to the initial state.
以上の説明で明らかなように１本実施例によれば過熱度
検出スイッチ１２のオンから電流ヒユーズＣＨ溶断まで
の時間、言い換えれば抵抗器Ｒ２とコンデンサＣ４とに
よる充放電回路の遅延時間は外気温度の影響を受けず一
定とすることができる。As is clear from the above description, according to this embodiment, the time from turning on the superheat detection switch 12 to blowing the current fuse CH, in other words, the delay time of the charging/discharging circuit formed by the resistor R2 and the capacitor C4 depends on the outside temperature. can be kept constant without being influenced by
第２図は本発明の第２の実施例を示す。この実施例は、
第１図に示した過熱度検出スイツチ１２と抵抗器Ｒ１と
の間にＰＴＣサーミスタＴＴｈを接続したものである。FIG. 2 shows a second embodiment of the invention. This example is
A PTC thermistor TTh is connected between the superheat degree detection switch 12 and the resistor R1 shown in FIG.
これは、第１図の実施例では過熱度検出スイッチ１２の
オンタイミングが外気温度の影響を受けることを考慮し
たものである。すなわち、過熱度検出スイッチ１２は、
前述したように圧縮機１の吸入側に設置され、第４図に
示すようにその一部が外気と直接触れるようになってい
るため、外気温度が吸入側の冷媒配管や過熱度検出スイ
ッチ１２の外気と直接触れる部分を介して吸入側冷媒ガ
スの過熱度に影響を及ぼすことになシ、これによって過
熱度検出スイッチ１２のオンタイミングは外気温度が高
いと早くなり、逆に低なると抵抗値も高くなシ、外気温
度が低くなれば抵抗値も低下する。このことによシ。外
気温度が高い場合には充放電回路への充電電流は小さく
なってノぐワートランジスタＰＴのオンタイミングを遅
くする。逆に、外気温度が低下するにつれて充電電流は
犬きくなシ、ノクワートランジスタＰＴのオンタイミン
グを早める。このようにして、外気温度が変動しても冷
媒の過熱度が設定（直に達してから電流ヒユーズ溶断ま
での遅延時間をほぼ一定として、圧縮機の保護動作を高
精度で実行することができる。This is done in consideration of the fact that in the embodiment shown in FIG. 1, the turn-on timing of the superheat degree detection switch 12 is affected by the outside temperature. That is, the superheat degree detection switch 12 is
As mentioned above, it is installed on the suction side of the compressor 1, and a part of it is in direct contact with the outside air as shown in FIG. The degree of superheating of the suction side refrigerant gas is affected through the part that directly contacts the outside air.As a result, the on timing of the superheat degree detection switch 12 becomes earlier when the outside air temperature is high, and conversely, when the outside air temperature is low, the resistance value is The resistance value also decreases as the outside temperature decreases. I'm sorry about this. When the outside temperature is high, the charging current to the charging/discharging circuit becomes small, thereby delaying the turn-on timing of the power transistor PT. Conversely, as the outside temperature decreases, the charging current slows down and the on-timing of the power transistor PT is brought forward. In this way, even if the outside temperature fluctuates, the delay time from when the degree of superheat of the refrigerant reaches a certain level until the current fuse blows out is almost constant, and the compressor protection operation can be executed with high precision. .
なお、第１．第２の実施例とも車輛用空調装置の場合に
ついて説明したが１本発明は冷凍機用圧、棒機全般に適
用できることは言うまでも無い。例えば、冷凍機用圧縮
機を電動機駆動とし、この電動機の駆動、停止を制御す
る方式でも第１．第２の実施例と同様に適用できる。In addition, 1. Although the second embodiment describes the case of a vehicle air conditioner, it goes without saying that the present invention can be applied to refrigerators and rod machines in general. For example, even if the compressor for a refrigerator is driven by an electric motor and the driving and stopping of this electric motor is controlled, the first method is as follows. It can be applied in the same way as the second embodiment.
本発明によれば、過熱度検出スイッチオンから冷凍機用
圧縮機１の停止に至るまでの遅延時間を。According to the present invention, there is a delay time from turning on the superheat detection switch to stopping the refrigerator compressor 1.
外気温度の影つｔを受けないＣＲ充放電回路で設定して
いるので、感温ヒユーズによる設定よシも精度の良い保
護動作を実行できる。また、感温ヒユーズに比して安価
、設置の簡単な電流ヒユーズを用いるので、サービス性
、メンテナンス性の良好な保護装置を提供できる。Since the setting is made using a CR charging/discharging circuit that is not affected by the outside temperature, highly accurate protection operation can be performed even when setting using a temperature-sensitive fuse. Furthermore, since a current fuse is used, which is cheaper and easier to install than a temperature-sensitive fuse, it is possible to provide a protective device with good serviceability and maintainability.
第１図は本発明を車輛用空調装置に適用した一実施例の
回路図、第２図は本発明の池の実施例の回路図、第３図
は車輛用空調装置における冷凍回路と冷凍機用圧縮機の
保護装置の従来例を示した図、第４図は第３図の保護装
置に用いられている従来の過熱度検出スイッチの断面図
、第５図は第３図の保護装置に用いられている従来の感
温ヒーーズの断面図。
図中、２はイグニションスイッチ、３は空調装置の起動
スイッチ、 ＴＨＣは温度サーモ、 ＣＨは電流ヒユー
ズ、ＴハはＰＴＣサーミスタ、ＥＣは准磁クラッチの励
磁コイル、１２は過熱度検出スイッチ。
第３図
第４１ 第５図Figure 1 is a circuit diagram of an embodiment in which the present invention is applied to a vehicle air conditioner, Figure 2 is a circuit diagram of an embodiment of a pond according to the present invention, and Figure 3 is a refrigeration circuit and refrigerator in a vehicle air conditioner. Fig. 4 is a sectional view of a conventional superheat detection switch used in the protection device of Fig. 3, and Fig. 5 is a cross-sectional view of a conventional superheat detection switch used in the protection device of Fig. 3. A cross-sectional view of a conventional temperature-sensitive heater used. In the figure, 2 is the ignition switch, 3 is the start switch for the air conditioner, THC is the temperature thermometer, CH is the current fuse, T is the PTC thermistor, EC is the excitation coil of the quasi-magnetic clutch, and 12 is the superheat detection switch. Figure 3 Figure 41 Figure 5
Claims (2)
スの過熱度を検出するスイッチと，該過熱度検出スイッ
チからの信号を一定時間遅延させる回路と，該遅延回路
からの出力によって導通して前記冷凍機用圧縮機のオン
，オフを規定する電源回路に挿入された電流ヒューズを
溶断させるためのトランジスタ回路とを備えた冷凍機用
圧縮機の保護装置。1. A switch provided at the refrigerant gas inlet of a refrigerator compressor to detect the degree of superheat of the refrigerant gas, a circuit that delays a signal from the degree of superheat detection switch for a certain period of time, and an output from the delay circuit. A protection device for a refrigerator compressor, comprising: a transistor circuit for blowing a current fuse inserted in a power supply circuit that regulates on/off of the refrigerator compressor.
記遅延回路は抵抗器とコンデンサとによる充放電回路で
構成し，前記過熱度検出スイッチの出力にはＰＴＣサー
ミスタと抵抗器とによる分圧回路を接続し，該ＰＴＣサ
ーミスタと抵抗器との接続点に前記充放電回路を接続し
たことを特徴とする冷凍機用圧縮機の保護装置。2. In the protective device according to claim 1, the delay circuit is configured with a charging/discharging circuit including a resistor and a capacitor, and the output of the superheat degree detection switch is provided with a voltage dividing circuit including a PTC thermistor and a resistor. A protection device for a compressor for a refrigerator, characterized in that the charge/discharge circuit is connected to a connection point between the PTC thermistor and the resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21762486A JPS6373064A (en) | 1986-09-16 | 1986-09-16 | Protective device for compressor for refrigerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21762486A JPS6373064A (en) | 1986-09-16 | 1986-09-16 | Protective device for compressor for refrigerator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6373064A true JPS6373064A (en) | 1988-04-02 |
Family
ID=16707202
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21762486A Pending JPS6373064A (en) | 1986-09-16 | 1986-09-16 | Protective device for compressor for refrigerator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6373064A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58134529A (en) * | 1982-02-05 | 1983-08-10 | Usac Electronics Ind Co Ltd | Fault detecting system of transistor |
| JPS61197970A (en) * | 1985-02-28 | 1986-09-02 | ダイキン工業株式会社 | Protective device for compressor of refrigerator |
-
1986
- 1986-09-16 JP JP21762486A patent/JPS6373064A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58134529A (en) * | 1982-02-05 | 1983-08-10 | Usac Electronics Ind Co Ltd | Fault detecting system of transistor |
| JPS61197970A (en) * | 1985-02-28 | 1986-09-02 | ダイキン工業株式会社 | Protective device for compressor of refrigerator |
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