JPS62294851A

JPS62294851A - Refrigerator

Info

Publication number: JPS62294851A
Application number: JP11508886A
Authority: JP
Inventors: 境野　一秋; 椎名　孝夫; 一朗上村; 公二永江; 久時崎; 一則松本
Original assignee: Sanyo Electric Co Ltd
Current assignee: Sanyo Electric Co Ltd
Priority date: 1986-05-20
Filing date: 1986-05-20
Publication date: 1987-12-22

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】３、発明の詳細な説明（イ）産業上の利用分野本発明はショーケース等の冷却機、及び冷房機やヒート
ポンプ式冷暖房機に利用される冷凍装置に関する。DETAILED DESCRIPTION OF THE INVENTION 3. Detailed Description of the Invention (a) Field of Industrial Application The present invention relates to a refrigerator for use in showcases and the like, and a refrigeration system used in air conditioners and heat pump air conditioners.

（ロ）従来の技術冷凍装置の高圧冷媒圧力が異常上昇すると圧縮機に過負
荷がかかって正常な運転が行なわれなくなるため、特公
昭５２−２１２１７号公報で提示されているように、凝
縮器の温度またはこれに相当する冷媒圧力を検出して圧
縮機の能力を下げることにより高圧冷媒圧力が異常上昇
しないようにしていた。(b) Conventional technology When the pressure of high-pressure refrigerant in a refrigeration system increases abnormally, the compressor is overloaded and cannot operate normally. The high-pressure refrigerant pressure was prevented from rising abnormally by detecting the temperature or the corresponding refrigerant pressure and lowering the compressor capacity.

（ハ）発明が解決しようとする問題点上述した従来装置では、凝縮器の温度が設定温度以上に
なると圧縮機の能力を下げて高圧冷媒圧力の異常上昇が
防止され、凝縮器の温度が設定温度以下になると圧縮機
能力が上がる、といった具合に圧縮機は高圧冷媒圧力の
異常上昇防止のために頻繁に能力が変えられるため、圧
縮機あ耐久性能上、好ましいものではなかった。(c) Problems to be solved by the invention In the conventional device described above, when the temperature of the condenser exceeds the set temperature, the capacity of the compressor is reduced to prevent an abnormal increase in the pressure of the high-pressure refrigerant, and the temperature of the condenser is set at the set temperature. Compressor capacity is often changed to prevent abnormal increases in high-pressure refrigerant pressure, such as when the temperature drops below that, the compression capacity increases, which is not desirable in terms of compressor durability.

本発明はかかる問題点を解決した冷凍装置を提供するも
のである。The present invention provides a refrigeration system that solves these problems.

（ニ）問題点を解決するための手段本発明は、凝縮器の温度またはこれに相当する冷媒圧力
が第１の設定値以上となった時、圧縮機の能力上昇を抑
える抑制手段と、凝縮器の温度（冷媒圧力）が第１の設
定値よりも高い第２の設定値以上となった時、圧縮機の
能力を下げる可変手段とを能力可変制御器に設けるよう
にしたものである。(d) Means for Solving the Problems The present invention provides a suppressing means for suppressing an increase in compressor capacity when the condenser temperature or the corresponding refrigerant pressure exceeds a first set value, and a condensing The variable capacity controller is provided with variable means for lowering the capacity of the compressor when the temperature (refrigerant pressure) of the compressor exceeds a second set value which is higher than the first set value.

（＊）作用凝縮器の温度（冷媒圧力）が第１の設定値以上となった
時、圧縮機の能力が上昇しないように抑制きれ、それで
も凝縮器の温度（冷媒圧力）が上がって第２の設定値以
上になると圧縮機の能力が下がる。このため、凝縮器の
温度（冷媒圧力）は次第に下降して第１と第２の設定値
の間に落ち着くようになり、高圧冷媒圧力の異常上昇防
止のために圧縮機の能力が頻繁に変わることはない。(*) Operation When the condenser temperature (refrigerant pressure) exceeds the first set value, the compressor capacity can be suppressed so that it does not increase, but the condenser temperature (refrigerant pressure) still rises and the second If the value exceeds the set value, the compressor capacity will decrease. For this reason, the condenser temperature (refrigerant pressure) gradually decreases and settles between the first and second set values, and the compressor capacity changes frequently to prevent abnormal increases in high-pressure refrigerant pressure. Never.

（へ）実施例第１図は本発明装置の実施例を示す冷媒回路図で、印加
される電源の周波数で能力が変わる能力可変型圧縮機〈
１）と冷暖流路切換用の四方弁（２）と凝縮器（３〉と
減圧素子（４）と蒸発器（５）とが順次環状に接続きれ
ている。(f) Embodiment Figure 1 is a refrigerant circuit diagram showing an embodiment of the device of the present invention, which is a variable capacity compressor whose capacity changes depending on the frequency of the applied power supply.
1), a four-way valve for switching between cooling and heating channels (2), a condenser (3), a pressure reducing element (4), and an evaporator (5) are connected in order in an annular manner.

（６〉は圧縮機（１）に印加する電源の周波数を変える
能力可変制御器で、凝縮器（３）で暖められる被調和室
（７）の温度を室温センサー（８）で検出してこの検出
温度と設定温度との温度差に応じて電源の周波数を変え
るものである。(6> is a variable capacity controller that changes the frequency of the power supply applied to the compressor (1). The temperature of the conditioned room (7) heated by the condenser (3) is detected by the room temperature sensor (8). The frequency of the power supply is changed according to the temperature difference between the detected temperature and the set temperature.

（９）は凝縮器（３）の温度を検出するセンサーで、こ
のセンサーで検出きれる凝縮器（３）の温度が第２図に
示すように第１の設定値（５８℃）以上となった時、圧
縮機（１）に印加する電源の周波数が高くなるのを禁止
して圧縮機（１）の能力上昇を抑える抑制手段（１０）
と、凝縮器（３）の検出温度が第１の設定値よりも高い
第２の設定値（６０°Ｃ）以上となった時、圧縮機（１
）に印加する電源の周波数を下げて圧縮機（１）の能力
を下げる可変手段（１１）とが能力可変制御器（６）に
設けである。(9) is a sensor that detects the temperature of the condenser (3), and the temperature of the condenser (3) that can be detected by this sensor exceeds the first set value (58℃) as shown in Figure 2. Suppressing means (10) for suppressing the increase in the capacity of the compressor (1) by prohibiting the frequency of the power supply applied to the compressor (1) from increasing when
When the detected temperature of the condenser (3) exceeds the second set value (60°C), which is higher than the first set value, the compressor (1)
The variable capacity controller (6) is provided with variable means (11) for lowering the capacity of the compressor (1) by lowering the frequency of the power supply applied to the compressor (1).

本発明装置は以上の如く構成されており、暖房運転時に
は圧縮機（１）より吐出された冷媒が四方弁（２）−凝
縮器（３）−減圧素子（４）−蒸発器（５）−四方弁（
２）を経て圧縮機（１）に戻る暖房サイクルが形成され
て被調和室（７）が暖房される。かかる運転中、顧客が
設定した設定温度と室温センサー（８）で検出される被
調和室（７）内の温度とを比較し、この温度差が大きい
と能力可変制御器（６）から圧縮機（１）に印加する電
源の周波数を高くして圧縮機（１）が高能力で運転され
、逆に温度差が小さいと能力可変制御器（６）から圧縮
機（１）に印加する電源の周波数を低くして圧縮機（１
）が低能力で運転されている。The apparatus of the present invention is constructed as described above, and during heating operation, the refrigerant discharged from the compressor (1) is distributed between the four-way valve (2) - the condenser (3) - the pressure reducing element (4) - the evaporator (5) - Four-way valve (
2) and returns to the compressor (1) to form a heating cycle to heat the conditioned room (7). During such operation, the set temperature set by the customer and the temperature in the conditioned room (7) detected by the room temperature sensor (8) are compared, and if the temperature difference is large, the variable capacity controller (6) The compressor (1) is operated at high capacity by increasing the frequency of the power supply applied to the compressor (1), and conversely, when the temperature difference is small, the power supply applied to the compressor (1) from the variable capacity controller (6) is operated at high capacity. The compressor (1
) is being operated at low capacity.

そして、かかる運転中、凝縮器（３）の温度が第２図に
示すＡ点で第１の設定値（５８°Ｃ）以上になると、セ
ンサー（９）からの検出信号を抑制手段（１０）が受け
て圧縮機（１）に印加する電源の周波数が高くなるのを
禁止し、室温センサー（８）からの検出信号で圧縮機（
１）に印加する電源の周波数を高くするように指令を受
けても圧縮機（１）の能力は高くならない、それでも、
凝縮器り３）の温度が上がって第２図に示すＢ点で第２
の設定値（６０℃）以上になると、センサー（９）から
の検出信号を可変手段（１１）が受けて圧縮機（１）に
印加する電源の周波数を下げて圧縮機（１）の能力を下
げるため、凝縮器（３）の温度は次第に下降して第２図
に示す０点で第２の設定値（６０°Ｃ）以下となって第
１と第２の設定値の間に落ち着くようになり、圧縮機（
１）の能力が高圧冷媒圧力の異常上昇防止のために頻繁
に変わることはない。During such operation, when the temperature of the condenser (3) exceeds the first set value (58°C) at point A shown in FIG. The frequency of the power supply applied to the compressor (1) is prohibited from increasing as a result of this, and the compressor (
Even if a command is received to increase the frequency of the power supply applied to compressor (1), the capacity of compressor (1) does not increase.
The temperature of the condenser 3) rises and reaches the second point at point B shown in Figure 2.
When the temperature exceeds the set value (60°C), the variable means (11) receives the detection signal from the sensor (9) and lowers the frequency of the power supply applied to the compressor (1) to increase the capacity of the compressor (1). In order to lower the temperature, the temperature of the condenser (3) gradually decreases until it becomes below the second set value (60°C) at the 0 point shown in Figure 2, and settles between the first and second set values. The compressor (
The capacity of 1) does not change frequently in order to prevent abnormal rise in high-pressure refrigerant pressure.

又、冷房運転時には四方弁（２）を破線状態に切換える
ことにより、蒸発器（５）が凝縮器として、凝縮器（３
）が蒸発器として作用し、被調和室（７）が冷房される
。かかる冷房運転中、被調和室（７）の温度を室温セン
サー（８）で検出してこの検出温度と設定温度の温度差
に応じて圧縮機（１）に印加される電源の周波数が能力
可変制御器（６）で変えられるようになっている。又、
センサー（９）で蒸発器として作用している凝縮器（３
）の温度を検出してこの熱交換器の温度が２°Ｃ以下に
下がると抑制手段（１０）で圧縮機（１）の能力上昇を
抑え、それでもこの熱交換器の温度が０°Ｃ以下に下が
ると可変手段（１１）で圧縮機（１）の能力を下げるこ
とにより温度を０℃と２℃との間に落ち若かせて熱交換
器に霜が付刃しないようにしており、圧縮機（１）の能
力が熱交換器の着霜防止のために頻繁に変わるのを防止
している。Also, during cooling operation, by switching the four-way valve (2) to the broken line state, the evaporator (5) functions as a condenser, and the condenser (3)
) acts as an evaporator to cool the conditioned room (7). During this cooling operation, the temperature of the conditioned room (7) is detected by the room temperature sensor (8), and the frequency of the power supply applied to the compressor (1) is variable in capacity depending on the temperature difference between the detected temperature and the set temperature. It can be changed using the controller (6). or,
The condenser (3) is acting as an evaporator at the sensor (9).
) is detected and when the temperature of this heat exchanger falls below 2°C, the suppressing means (10) suppresses the increase in the capacity of the compressor (1), and the temperature of this heat exchanger still remains below 0°C. When the temperature drops to 0°C and 2°C, the variable means (11) lowers the capacity of the compressor (1) to keep the temperature between 0°C and 2°C and prevent frost from forming on the heat exchanger. The capacity of the heat exchanger (1) is prevented from changing frequently to prevent frost formation on the heat exchanger.

尚、上記実施例では印加される電源周波数で能力が変わ
る圧縮機（１）を用いたが、アンローダ機構や極数変換
機構で能力が変わる圧縮機を用いても良い。In the above embodiment, a compressor (1) whose capacity changes depending on the applied power frequency is used, but a compressor whose capacity changes depending on an unloader mechanism or a pole number conversion mechanism may also be used.

又、凝縮器（３）の温度を検出する代わりにこの温度に
相当する冷媒圧力を検出しても良い。Furthermore, instead of detecting the temperature of the condenser (3), the refrigerant pressure corresponding to this temperature may be detected.

（ト）発明の効果本発明によれば、凝縮器の温度（冷媒圧力）が第１の設
定値以上になると圧縮機の能力上昇を抑え、それでも凝
縮器の温度（冷媒圧力）が上がって第２の設定値以上に
なると圧縮機の能力を下げるようにしたので、凝縮器の
温度（冷媒圧力）が次第に下降して第１と第２の設定値
の間に落ち着くようになり、高圧冷媒圧力の異常上昇防
止のために圧縮機の能力が頻繁に変わることがないため
、圧縮機の耐久性を向上することができる。(G) Effects of the Invention According to the present invention, when the temperature (refrigerant pressure) of the condenser exceeds the first set value, the increase in capacity of the compressor is suppressed. Since the compressor capacity is lowered when the temperature exceeds the second set value, the condenser temperature (refrigerant pressure) gradually decreases and settles between the first and second set values, and the high-pressure refrigerant pressure decreases. Since the capacity of the compressor does not change frequently in order to prevent an abnormal rise in air pressure, the durability of the compressor can be improved.

[Brief explanation of the drawing]

図面は本発明装置の実施例を示すもので、第１図は冷媒
回路図、第２図は凝縮器温度と圧縮機能力との相関関係
を示す特性図である。（１）・・・能力可変型圧縮機、　（３）・・・凝縮器
、（４）・・・減圧素子、　（５）・・・蒸発器、　（
６）・・・能力可変制御器、　（９）・・・センサー、
　（１０）・・・抑制手段、　（１１）・・・可変手段
。出願人　三洋電機株式会社外１名代理人　弁理士　西野卓嗣　外１名第１図第２図Ａ　　　　　　　　　　　　Ｂ　　　　　　　　　Ｃ−
晴藺The drawings show an embodiment of the apparatus of the present invention, and FIG. 1 is a refrigerant circuit diagram, and FIG. 2 is a characteristic diagram showing the correlation between condenser temperature and compression function. (1)...Variable capacity compressor, (3)...Condenser, (4)...Pressure reducing element, (5)...Evaporator, (
6)...Capacity variable controller, (9)...Sensor,
(10)... Suppression means, (11)... Variable means. Applicant Sanyo Electric Co., Ltd. and one other agent Patent attorney Takuji Nishino and one other person Figure 1 Figure 2 A B C-
Haruichi

Claims

[Claims]

(1) In a refrigeration system equipped with a refrigeration circuit in which a variable capacity compressor, a condenser, a pressure reducing element, and an evaporator are sequentially connected in an annular manner, and a variable capacity controller that changes the capacity of the compressor, the temperature of the condenser is or an equivalent sensor for detecting refrigerant pressure, and when the detected temperature (pressure) of this sensor becomes equal to or higher than a first set value, a suppressing means for suppressing an increase in the capacity of the compressor; The refrigeration system is characterized in that the capacity variable controller is provided with variable means for lowering the capacity of the compressor when the pressure (pressure) exceeds a second set value which is higher than the first set value.