JPH08189709A - Refrigerating device and operation control system therefor - Google Patents

Refrigerating device and operation control system therefor

Info

Publication number
JPH08189709A
JPH08189709A JP210895A JP210895A JPH08189709A JP H08189709 A JPH08189709 A JP H08189709A JP 210895 A JP210895 A JP 210895A JP 210895 A JP210895 A JP 210895A JP H08189709 A JPH08189709 A JP H08189709A
Authority
JP
Japan
Prior art keywords
compressor
value
pressure
suction side
detected
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
Application number
JP210895A
Other languages
Japanese (ja)
Inventor
Kenichiro Katogi
健一郎 加藤木
Seiji Hiraoka
清司 平岡
Ryosuke Tomita
良輔 富田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Hitachi Shimizu Engineering Co Ltd
Original Assignee
Hitachi Ltd
Hitachi Shimizu Engineering Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd, Hitachi Shimizu Engineering Co Ltd filed Critical Hitachi Ltd
Priority to JP210895A priority Critical patent/JPH08189709A/en
Publication of JPH08189709A publication Critical patent/JPH08189709A/en
Pending legal-status Critical Current

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  • Devices That Are Associated With Refrigeration Equipment (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

PURPOSE: To permit stabilized starting operation even under the condition of low outside temperature in a cold district and the like. CONSTITUTION: A controller 10 compares the reference value of suction side pressure of a compressor 1, which is set previously, with the detected value of a pressure sensor 7 and starts the operation of a refrigerating device only when the detected value has become higher than the reference value. Further, the controller 10 is provided with a function of changing the reference value of suction side pressure of the compressor 1 in accordance with an outside temperature detected by an outside air thermistor 8. According to this method, a state in which the operation of the refrigerating device can not be started, can be avoided.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、圧縮機の吸入圧力を検
出しその検出値に基づいて運転及び停止制御を行う冷凍
装置及びその運転制御方式に関し、特に、寒冷地域など
の低外気温度条件下でも安定した運転を行うことができ
る冷凍装置及びその運転制御方式に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerating apparatus for detecting a suction pressure of a compressor and controlling operation and stop based on the detected value, and an operation control method thereof, and particularly to a low outside air temperature condition in a cold region. The present invention relates to a refrigerating apparatus that can perform stable operation even under the temperature and an operation control method thereof.

【0002】[0002]

【従来の技術】このような冷凍装置としては、特開昭6
2−225857号公報に記載されているようなものが
ある。この従来の冷凍装置は、圧縮機、凝縮器、受液
器、膨張弁及び蒸発器からなる冷凍サイクルを有し、さ
らに、冷凍機周辺の外気温度を検出し、その検出した外
気温度に対応させて圧縮機の吸入圧力の設定値すなわち
運転及び停止を切り替える目標値を自動的に変化させる
ことで、省エネルギ化を図っている冷凍装置がある。
2. Description of the Related Art As such a refrigerating apparatus, Japanese Patent Laid-Open No.
There is one such as that described in JP-A-2-225857. This conventional refrigeration system has a refrigeration cycle consisting of a compressor, a condenser, a liquid receiver, an expansion valve, and an evaporator.Furthermore, it detects the outside air temperature around the refrigerator and makes it correspond to the detected outside air temperature. There is a refrigerating device that saves energy by automatically changing a set value of the suction pressure of the compressor, that is, a target value for switching between operation and stop.

【0003】[0003]

【発明が解決しようとする課題】しかしながら上述の従
来の冷凍装置では、冷凍装置の起動後において、圧縮機
の吸入圧力の下限についての設定値(以下、低圧圧力値
という)を自動的に変化させるものであり、冷凍装置の
起動時については何ら考慮していなかった。これより、
従来の冷凍装置では、寒冷地域などの低外気温度条件下
で冷凍装置の周囲温度が非常に低い場合は、圧縮機の吸
入圧力が通常よりも低い値となっているので、冷凍装置
を起動させようとしても運転開始の条件となる低圧圧力
値まで圧縮機の吸入圧力の検出値が上昇せず、運転を開
始することができないという問題があった。
However, in the above-mentioned conventional refrigeration system, the set value (hereinafter referred to as the low pressure value) for the lower limit of the suction pressure of the compressor is automatically changed after the refrigeration system is started. However, no consideration was given to the startup of the refrigeration system. Than this,
In a conventional refrigeration system, when the ambient temperature of the refrigeration system is extremely low under low outside temperature conditions such as in cold regions, the suction pressure of the compressor is lower than normal, so start the refrigeration system. Even in such a case, there is a problem in that the detected value of the suction pressure of the compressor does not rise to the low pressure value which is the condition for starting the operation, and the operation cannot be started.

【0004】上記問題点を図1を参考として具体的に説
明する。低外気温度条件下において、冷蔵庫12内の温
度が所定の温度以上に上昇すると、例えば冷蔵庫内に設
置されたサーモスタット9が動作して冷凍装置の運転開
始信号が発生する。この運転開始信号に応じて液電磁弁
6が開く。
The above problems will be specifically described with reference to FIG. When the temperature in the refrigerator 12 rises above a predetermined temperature under the low outside air temperature condition, for example, the thermostat 9 installed in the refrigerator operates to generate an operation start signal of the refrigeration system. The liquid solenoid valve 6 opens in response to this operation start signal.

【0005】しかし、特に冷凍装置が長時間停止してい
る場合などは、屋外に設置されているキャビネット11
内では外気温度と同様に非常に温度が低くなっており、
受液器3内の液冷媒の圧力値と蒸発器5側の圧力値との
圧力差が非常に小さくなる。これにより、液冷媒が蒸発
器5側に供給されにくくなり、蒸発器5側に供給される
液冷媒の量が非常に少なくなるので、圧縮機1の吸入側
の圧力値がほとんど上昇しない。
However, particularly when the refrigeration system is stopped for a long time, the cabinet 11 installed outdoors is used.
Inside, the temperature is very low, like the outside temperature,
The pressure difference between the pressure value of the liquid refrigerant in the liquid receiver 3 and the pressure value on the evaporator 5 side becomes extremely small. This makes it difficult for the liquid refrigerant to be supplied to the evaporator 5 side, and the amount of the liquid refrigerant supplied to the evaporator 5 side is very small, so that the pressure value on the suction side of the compressor 1 hardly rises.

【0006】そして、圧縮機1の吸入側の圧力値が所定
の値以上になったときのみ冷凍装置の運転を開始すると
いう制御方式をとっているので、上述の場合には冷蔵庫
12内の温度が所定の温度以上になったにもかかわら
ず、運転を開始することができないこととなる。
Since the refrigeration system is started only when the pressure value on the suction side of the compressor 1 exceeds a predetermined value, the temperature inside the refrigerator 12 is increased in the above case. Even if the temperature exceeds a predetermined temperature, the operation cannot be started.

【0007】そこで、本発明は、寒冷地域などの低外気
温度条件下でも安定した運転起動動作を行うことができ
る冷凍装置及びその運転制御方式を提供することを目的
とする。
Therefore, an object of the present invention is to provide a refrigerating apparatus and an operation control system therefor capable of performing a stable operation start-up operation even under a low outside air temperature condition such as in a cold region.

【0008】[0008]

【課題を解決するための手段】本発明の冷凍装置は、圧
縮機、凝縮器、受液器、膨張弁及び蒸発器を有してなる
冷凍サイクルを備え、前記圧縮器、凝縮器及び受液器を
キャビネット内に納めるとともに、前記キャビネットを
屋外に設置する冷凍装置において、前記圧縮器の吸入側
圧力を検出する圧力センサと、外気温度を検出するサー
ミスタと、前記圧力センサ及び前記サーミスタのそれぞ
れの検出値に応じて本冷凍装置の運転状態を制御するコ
ントローラとを有し、前記コントローラは、予め設定し
てある圧縮器の吸入側圧力の基準値と前記圧力センサに
よる検出値とを比較して該検出値が該基準値以上になっ
たときのみ冷却運転を開始し、さらに、前記コントロー
ラは、前記サーミスタが検出した外気温度に応じて前記
圧縮器の吸入側圧力の基準値を変更することを特徴とす
る。
A refrigerating apparatus of the present invention comprises a refrigeration cycle having a compressor, a condenser, a liquid receiver, an expansion valve and an evaporator, and the compressor, the condenser and the liquid receiver. In a refrigerating device in which the container is housed in a cabinet and the cabinet is installed outdoors, a pressure sensor that detects the suction side pressure of the compressor, a thermistor that detects the outside air temperature, and a pressure sensor and the thermistor, respectively. And a controller for controlling the operating state of the refrigeration system according to the detected value, wherein the controller compares the preset reference value of the suction side pressure of the compressor with the detected value by the pressure sensor. The cooling operation is started only when the detected value becomes equal to or higher than the reference value, and further, the controller controls the suction side pressure of the compressor according to the outside air temperature detected by the thermistor. And changing the reference value.

【0009】また、冷凍装置は、コントローラが、本冷
凍装置の運転開始信号を検出し、その運転開始信号を検
出した時から所定時間経過後においても、圧力センサに
よる検出値が圧縮器の吸入側圧力の基準値に達していな
い場合は、冷媒の種類及びサーミスタが検出した外気温
度に基づいて飽和圧力値を算出し、さらに、コントロー
ラは、前記飽和圧力値を前記圧縮器の吸入側圧力の基準
値に置き換えることが好ましい。
Further, in the refrigerating apparatus, the controller detects the operation start signal of the present refrigerating apparatus, and even after a predetermined time has elapsed since the operation start signal was detected, the value detected by the pressure sensor is the suction side of the compressor. If the pressure reference value has not been reached, the saturation pressure value is calculated based on the type of refrigerant and the outside air temperature detected by the thermistor, and the controller sets the saturation pressure value to the suction side pressure reference of the compressor. It is preferable to replace it with a value.

【0010】本発明の冷凍装置の運転制御方式は、圧縮
機、凝縮器、受液器、膨張弁及び蒸発器を有してなる冷
凍サイクルと、前記圧縮器の吸入側圧力を検出する圧力
センサと、外気温度を検出するサーミスタとを有し、前
記圧縮器、凝縮器及び受液器をキャビネット内に納める
とともに、前記キャビネットを屋外に設置する冷凍装置
において、予め設定してある圧縮器の吸入側圧力の基準
値と前記圧力センサによる検出値とを比較して該検出値
が該基準値以上になったときのみ冷却運転を開始し、さ
らに、前記サーミスタが検出した外気温度に応じて前記
圧縮器の吸入側圧力の基準値を変更することを特徴とす
る。
The operation control system of the refrigerating apparatus of the present invention comprises a refrigerating cycle having a compressor, a condenser, a liquid receiver, an expansion valve and an evaporator, and a pressure sensor for detecting the suction side pressure of the compressor. And a thermistor for detecting the outside air temperature, the compressor, the condenser, and the liquid receiver are housed in a cabinet, and in a refrigerating apparatus in which the cabinet is installed outdoors, suction of a compressor set in advance The reference value of the side pressure is compared with the value detected by the pressure sensor, and the cooling operation is started only when the detected value becomes equal to or more than the reference value, and the compression is performed according to the outside air temperature detected by the thermistor. It is characterized by changing the reference value of the suction side pressure of the vessel.

【0011】また、本発明の冷凍装置の運転制御方式
は、本冷凍装置についての運転開始信号を検出した時か
ら所定時間経過後においても、圧力センサによる検出値
が圧縮器の吸入側圧力の基準値に達していない場合は、
冷媒の種類及びサーミスタが検出した外気温度に基づい
て飽和圧力値を算出し、さらに、前記飽和圧力値を前記
圧縮器の吸入側圧力の基準値に置き換えることが好まし
い。
Further, according to the operation control method of the refrigerating apparatus of the present invention, the value detected by the pressure sensor is a reference of the pressure on the suction side of the compressor even after a predetermined time has elapsed since the operation start signal for the present refrigerating apparatus was detected. If the value has not been reached,
It is preferable to calculate the saturation pressure value based on the type of refrigerant and the outside air temperature detected by the thermistor, and further replace the saturation pressure value with the reference value of the suction side pressure of the compressor.

【0012】[0012]

【作用】本冷凍装置及びその運転制御方式において、例
えば、冷蔵庫内の温度上昇にともなってその冷蔵庫内に
設置されたサーモスタットが復帰したこと等により冷却
運転を開始させる信号が発生すると、これと同期して液
電磁弁が開き、液冷媒を受液器側から蒸発器側へ供給し
ようとする。
In the present refrigerating apparatus and its operation control system, when a signal for starting the cooling operation is generated due to, for example, the thermostat installed in the refrigerator returning due to the temperature rise in the refrigerator, it is synchronized with this. Then, the liquid solenoid valve opens and tries to supply the liquid refrigerant from the liquid receiver side to the evaporator side.

【0013】ここで、外気温度がそれほど低くない通常
の運転状態では、液冷媒を受液器側から蒸発器側へ供給
され、この冷媒の循環により圧縮器の吸入側の圧力値が
上昇する。そして、圧力センサで検出した圧縮器の吸入
側圧力値が、予め設定してある圧縮器の吸入側圧力の基
準値以上となった時点で、冷却運転を開始する。
In a normal operating condition where the outside air temperature is not so low, liquid refrigerant is supplied from the liquid receiver side to the evaporator side, and the pressure value on the suction side of the compressor rises due to the circulation of this refrigerant. Then, when the suction side pressure value of the compressor detected by the pressure sensor becomes equal to or higher than the preset reference value of the suction side pressure of the compressor, the cooling operation is started.

【0014】一方、本冷凍装置を寒冷地に設置した場合
等において、特に外気温度が非常に低い条件となったと
きは、冷却運転を開始させる信号が発生し、これと同期
して液電磁弁が開いても、受液器における液冷媒も非常
に低温状態となっていて、その液冷媒が受液器側から蒸
発器側へほとんど移動しないという事態が生じてしま
う。
On the other hand, when the present refrigerating apparatus is installed in a cold region, especially when the outside air temperature is extremely low, a signal for starting the cooling operation is generated, and the liquid solenoid valve is synchronized with this signal. Even if is opened, the liquid refrigerant in the liquid receiver is also in a very low temperature state, and the liquid refrigerant hardly moves from the liquid receiver side to the evaporator side.

【0015】この状態において、運転開始信号が発生し
た時から所定時間経過後においても、圧力センサによる
検出値が圧縮器の吸入側圧力の基準値に達していない場
合は、冷媒の種類及びサーミスタが検出した外気温度に
基づいて飽和圧力値を算出し、さらに、前記飽和圧力値
を前記圧縮器の吸入側圧力の基準値に置き換える。
In this state, if the value detected by the pressure sensor has not reached the reference value of the pressure on the suction side of the compressor even after a lapse of a predetermined time after the operation start signal is generated, the type of refrigerant and the thermistor are changed. A saturation pressure value is calculated based on the detected outside air temperature, and the saturation pressure value is replaced with a reference value of the suction side pressure of the compressor.

【0016】これにより、吸入側圧力の基準値が圧力セ
ンサの検出値に自動的に近づき、圧力センサの検出値が
基準値以上になり易くなるので、冷却運転をスムーズに
開始することができる。
As a result, the reference value of the suction side pressure automatically approaches the detection value of the pressure sensor, and the detection value of the pressure sensor tends to exceed the reference value, so that the cooling operation can be started smoothly.

【0017】[0017]

【実施例】以下、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.

【0018】図1は、本発明の実施例に係る冷凍装置を
示す冷凍サイクル系統図である。本冷凍装置は、圧縮機
1、凝縮器2、受液器3、膨張弁4及び蒸発器5を有し
てなる冷凍サイクルを備えている。ここで、圧縮器1、
凝縮器2及び受液器3はキャビネット11内に納めてお
り、このキャビネット11を屋外に設置している。
FIG. 1 is a refrigeration cycle system diagram showing a refrigeration system according to an embodiment of the present invention. The refrigeration system includes a refrigeration cycle including a compressor 1, a condenser 2, a liquid receiver 3, an expansion valve 4 and an evaporator 5. Here, the compressor 1,
The condenser 2 and the liquid receiver 3 are housed in a cabinet 11, and the cabinet 11 is installed outdoors.

【0019】さらに、本冷凍装置は、圧縮器1の吸入側
圧力を検出する圧力センサ7と、外気温度を検出する外
気サーミスタ8と、圧力センサ7及び外気サーミスタ8
のそれぞれの検出値に応じて本冷凍装置の運転状態を制
御するコントローラ10とを有している。
Further, the present refrigeration system has a pressure sensor 7 for detecting the suction side pressure of the compressor 1, an outside air thermistor 8 for detecting the outside air temperature, a pressure sensor 7 and an outside air thermistor 8.
And a controller 10 that controls the operating state of the present refrigeration system in accordance with the respective detected values.

【0020】そのコントローラ10は、予め設定してあ
る圧縮器1の吸入側圧力の基準値と圧力センサ7による
検出値とを比較し、その検出値が基準値以上になったと
きのみ本冷凍装置の運転を開始させる。さらに、コント
ローラ10は、外気サーミスタ8が検出した外気温度に
応じて圧縮器1の吸入側圧力の基準値を変更する機能も
持っている。
The controller 10 compares a preset reference value of the suction side pressure of the compressor 1 with a detection value of the pressure sensor 7, and only when the detection value becomes equal to or higher than the reference value, the present refrigerating apparatus To start driving. Further, the controller 10 also has a function of changing the reference value of the suction side pressure of the compressor 1 according to the outside air temperature detected by the outside air thermistor 8.

【0021】さらに、コントローラ10は、本冷凍装置
についての運転開始信号を検出する。そして、その運転
開始信号を検出した時から所定時間経過後においても、
圧力センサ7による検出値が圧縮器の吸入側圧力の基準
値に達していない場合は、コントローラ10は冷媒の種
類及び外気サーミスタ8が検出した外気温度に基づいて
飽和圧力値を算出する。そして、コントローラ10は、
算出した飽和圧力値を圧縮器の吸入側圧力の基準値に置
き換えるという機能も持つ。
Further, the controller 10 detects an operation start signal for the present refrigeration system. Then, even after a predetermined time has elapsed since the operation start signal was detected,
When the value detected by the pressure sensor 7 has not reached the reference value of the suction side pressure of the compressor, the controller 10 calculates the saturation pressure value based on the type of refrigerant and the outside air temperature detected by the outside air thermistor 8. Then, the controller 10
It also has the function of replacing the calculated saturation pressure value with the reference value of the suction side pressure of the compressor.

【0022】また、膨張弁4及び蒸発器5が配置されて
いる冷蔵庫12内には、冷蔵庫内の温度の所定の温度以
上になった時に動作する庫内温度サーモスタット9と、
その庫内温度サーモスタット9の動作に応じて開閉する
液電磁弁6とを有している。ここで、液電磁弁6は、冷
凍サイクルにおける膨張弁4の上流側に配置されてい
る。
Further, in the refrigerator 12 in which the expansion valve 4 and the evaporator 5 are arranged, an inside temperature thermostat 9 which operates when the temperature in the refrigerator exceeds a predetermined temperature,
It has a liquid solenoid valve 6 that opens and closes according to the operation of the internal temperature thermostat 9. Here, the liquid solenoid valve 6 is arranged on the upstream side of the expansion valve 4 in the refrigeration cycle.

【0023】次に、本冷凍装置の動作について説明す
る。図2は、本冷凍装置の運転制御方式を示すフローチ
ャートである。まず、通常の運転動作について説明す
る。冷蔵庫12内に設置された庫内温度サーモスタット
9が、冷蔵庫12内の温度上昇に応じて復帰動作すなわ
ちON状態になると(S1,S2)、これと同期して液
電磁弁6が開く。
Next, the operation of this refrigeration system will be described. FIG. 2 is a flowchart showing the operation control method of the present refrigeration system. First, a normal driving operation will be described. When the internal temperature thermostat 9 installed in the refrigerator 12 returns to the ON state (S1, S2) in response to the temperature increase in the refrigerator 12 (S1, S2), the liquid solenoid valve 6 opens in synchronization with this.

【0024】これにより、屋外に設置されたキャビネッ
ト11内の受液器3より、液冷媒が蒸発器5側に導入さ
れ、徐々に圧縮機1の吸入側圧力が上昇する。その吸入
側圧力が、コントローラ10において予め設定されてい
る基準値である設定圧力値A以上となると(S3,S
4)、圧縮機1が起動し、冷凍装置は運転を開始する
(S11)。
As a result, the liquid refrigerant is introduced to the evaporator 5 side from the liquid receiver 3 in the cabinet 11 installed outdoors, and the suction side pressure of the compressor 1 gradually rises. When the suction side pressure becomes equal to or higher than the set pressure value A which is a reference value preset in the controller 10 (S3, S
4), the compressor 1 is started, and the refrigeration system starts operation (S11).

【0025】次に、寒冷地域等に本冷凍装置を設置した
場合すなわち低外気温度条件下における本冷凍装置の動
作について説明する。まず、冷蔵庫12内に設置された
庫内温度サーモスタット9が、冷蔵庫12内の温度上昇
に応じて復帰動作すなわちON状態になると(S1,S
2)、これと同期して液電磁弁6が開く。このとき、コ
ントローラ10へ運転開始信号が入力される。
Next, the operation of the present refrigeration system when the present refrigeration system is installed in a cold region or the like, that is, under a low outside air temperature condition will be described. First, when the internal temperature thermostat 9 installed in the refrigerator 12 is brought into the return operation, that is, the ON state in response to the temperature increase in the refrigerator 12 (S1, S
2) The liquid solenoid valve 6 opens in synchronization with this. At this time, the operation start signal is input to the controller 10.

【0026】しかし、屋外に設置されているキャビネッ
ト11内では外気温度と同様に非常に温度が低くなって
おり、受液器3内の液冷媒の圧力値と蒸発器5側の圧力
値との圧力差が非常に小さくなっている。これにより、
液冷媒が蒸発器5側に供給されにくくなり、蒸発器5側
に供給される液冷媒の量が非常に少なくなるので、圧縮
機1の吸入側の圧力値がほとんど上昇しない。
However, in the cabinet 11 installed outdoors, the temperature is very low like the outside air temperature, and the pressure value of the liquid refrigerant in the receiver 3 and the pressure value on the evaporator 5 side are the same. The pressure difference is very small. This allows
Since it becomes difficult to supply the liquid refrigerant to the evaporator 5 side and the amount of the liquid refrigerant supplied to the evaporator 5 side becomes very small, the pressure value on the suction side of the compressor 1 hardly rises.

【0027】この状態においては、圧縮機1の吸入側の
圧力値が設定圧力値A以上とならないので、運転を開始
することができない(S3,S4)。
In this state, since the pressure value on the suction side of the compressor 1 does not exceed the set pressure value A, the operation cannot be started (S3, S4).

【0028】ここで、コントローラ10は、運転開始信
号を入力した時から一定時間が経過したか否かを監視し
ている(S3)。前記の一定時間は、本冷凍装置の設置
条件、特に配管の長さを重視して予めコントローラ10
において設定してある。
Here, the controller 10 monitors whether or not a fixed time has elapsed since the operation start signal was input (S3). During the above-mentioned fixed time, the controller 10 is installed in advance with emphasis on the installation conditions of the present refrigeration system, particularly the length of the pipe.
It is set in.

【0029】運転開始信号を入力した時から一定時間が
経過した後においても、圧縮機1の吸入側に設置された
圧力センサ7によって検出した圧力値がコントローラ1
0において予め設定された運転開始圧力値である設定圧
力値Aに達しない場合は、外気サーミスタ8にて外気温
度を検知し、その検出値をコントローラ10に入力す
る。そして、コントローラ10は、外気温度に対する使
用冷媒の飽和圧力値を算出する(S5)。
The pressure value detected by the pressure sensor 7 installed on the suction side of the compressor 1 is the controller 1 even after a certain time has elapsed from the input of the operation start signal.
When the set pressure value A, which is the preset operation start pressure value, is not reached at 0, the outside air thermistor 8 detects the outside air temperature and inputs the detected value to the controller 10. Then, the controller 10 calculates the saturation pressure value of the used refrigerant with respect to the outside air temperature (S5).

【0030】その後、コントローラ10は、算出した飽
和圧力値を圧縮器1の吸入側圧力の基準値に置き換え、
すなわち飽和圧力値を運転開始圧力値である設定圧力値
Bとする(S6)。ここで、飽和圧力値である設定圧力
値Bは、圧力センサ7にて検出した圧力値とほぼ同じ値
となるので、圧力センサ7にて検出した圧力値が設定圧
力値Bに達しやすくなる。
Thereafter, the controller 10 replaces the calculated saturated pressure value with the reference value of the suction side pressure of the compressor 1,
That is, the saturated pressure value is set as the set pressure value B which is the operation start pressure value (S6). Here, the set pressure value B, which is the saturated pressure value, is almost the same value as the pressure value detected by the pressure sensor 7, so that the pressure value detected by the pressure sensor 7 easily reaches the set pressure value B.

【0031】その後、圧力センサ7にて検出した圧力値
が設定圧力値B以上となったら(S7)、強制運転を開
始する(S8)。その強制運転を開始してから一定時間
Dが経過したときは(S9)、強制運転における運転開
始圧力値である設定圧力値Bを設定圧力値Aに戻し(S
10)、通常の運転に移る(S11)。
After that, when the pressure value detected by the pressure sensor 7 becomes equal to or higher than the set pressure value B (S7), the forced operation is started (S8). When a certain time D has elapsed since the forced operation was started (S9), the set pressure value B, which is the operation start pressure value in the forced operation, is returned to the set pressure value A (S
10) Then, shift to normal operation (S11).

【0032】なお、ステップ9における一定時間Dは、
外気温度等の条件により、受液器3内の温度が上昇し、
蒸発器5側との圧力差が確保されるための時間をコント
ローラ10にて設定する。
The fixed time D in step 9 is
The temperature inside the receiver 3 rises due to conditions such as the outside air temperature,
The controller 10 sets the time for ensuring the pressure difference with the evaporator 5 side.

【0033】これらにより、本冷凍装置は、冷蔵庫12
内の温度が所定の温度以上になって庫内温度サーモスタ
ット9が復帰して冷却運転を開始すべきこととなった場
合において、外気温度が低いことから圧縮機1の吸入側
の圧力が上昇せず、その吸入側の圧力が通常運転時の基
準値まで達しないこととなっても、その基準値を外気温
度に対する使用冷媒の飽和圧力値に置き換えることで、
その基準値を自動的に所定値まで低下させることがで
き、寒冷地域などの低外気温度条件下でも安定した運転
開始動作を行うことができる。
Due to these, the present refrigerating apparatus is provided with the refrigerator 12
When the internal temperature becomes higher than or equal to a predetermined temperature and the internal temperature thermostat 9 is restored to start the cooling operation, the pressure on the suction side of the compressor 1 rises because the outside air temperature is low. Even if the suction side pressure does not reach the reference value during normal operation, by replacing the reference value with the saturated pressure value of the refrigerant used for the outside air temperature,
The reference value can be automatically reduced to a predetermined value, and a stable operation start operation can be performed even under a low outside air temperature condition such as a cold region.

【0034】[0034]

【発明の効果】以上説明したように本発明によれば、圧
縮器の吸入側圧力が所定の基準値以上になったときのみ
運転を開始する方式の冷凍装置において、外気温度に応
じて圧縮器の吸入側圧力の基準値を変更するので、寒冷
地域などの低外気温度条件下でも安定した運転開始動作
を行うことができる。
As described above, according to the present invention, in the refrigeration system of the type in which the operation is started only when the suction side pressure of the compressor becomes equal to or higher than the predetermined reference value, the compressor depending on the outside air temperature. Since the reference value of the suction side pressure is changed, it is possible to perform a stable operation start operation even under a low outside air temperature condition such as a cold region.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の実施例に係る冷凍装置を示す冷凍サイ
クル系統図である。
FIG. 1 is a refrigeration cycle system diagram showing a refrigeration apparatus according to an embodiment of the present invention.

【図2】本発明の実施例に係る冷凍装置の運転制御方式
を示すフローチャートである。
FIG. 2 is a flowchart showing an operation control system of the refrigeration system according to the embodiment of the present invention.

【符号の説明】[Explanation of symbols]

1 圧縮機 2 凝縮器 3 受液器 4 膨張弁 5 蒸発器 6 液電磁弁 7 圧力センサ 8 外気サーミスタ 9 庫内温度サーモスタット 10 コントローラ 11 キャビネット 12 冷蔵庫 1 Compressor 2 Condenser 3 Liquid Receiver 4 Expansion Valve 5 Evaporator 6 Liquid Solenoid Valve 7 Pressure Sensor 8 Outside Air Thermistor 9 Internal Temperature Thermostat 10 Controller 11 Cabinet 12 Refrigerator

───────────────────────────────────────────────────── フロントページの続き (72)発明者 富田 良輔 静岡県清水市村松390番地 株式会社日立 製作所空調システム事業部内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ryosuke Tomita 390 Muramatsu, Shimizu City, Shizuoka Prefecture Hitachi Ltd. Air Conditioning Systems Division

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 圧縮機、凝縮器、受液器、膨張弁及び蒸
発器を有してなる冷凍サイクルを備え、前記圧縮器、凝
縮器及び受液器をキャビネット内に納めるとともに、前
記キャビネットを屋外に設置する冷凍装置において、前
記圧縮器の吸入側圧力を検出する圧力センサと、外気温
度を検出するサーミスタと、前記圧力センサ及び前記サ
ーミスタのそれぞれの検出値に応じて本冷凍装置の運転
状態を制御するコントローラとを有し、前記コントロー
ラは、予め設定してある圧縮器の吸入側圧力の基準値と
前記圧力センサによる検出値とを比較して該検出値が該
基準値以上になったときのみ冷却運転を開始し、さら
に、前記コントローラは、前記サーミスタが検出した外
気温度に応じて前記圧縮器の吸入側圧力の基準値を変更
することを特徴とする冷凍装置。
1. A refrigeration cycle comprising a compressor, a condenser, a liquid receiver, an expansion valve and an evaporator, wherein the compressor, the condenser and the liquid receiver are housed in a cabinet and the cabinet is In a refrigeration apparatus installed outdoors, a pressure sensor that detects the suction side pressure of the compressor, a thermistor that detects the outside air temperature, and an operating state of the refrigeration apparatus according to the detection values of the pressure sensor and the thermistor. And a controller that controls a reference value of the suction side pressure of the compressor set in advance and the detection value by the pressure sensor, and the detection value becomes equal to or more than the reference value. Only when the cooling operation is started, further, the controller changes the reference value of the suction side pressure of the compressor according to the outside air temperature detected by the thermistor. Refrigeration equipment.
【請求項2】 請求項1記載の冷凍装置において、コン
トローラは、本冷凍装置の運転開始信号を検出し、その
運転開始信号を検出した時から所定時間経過後において
も、圧力センサによる検出値が圧縮器の吸入側圧力の基
準値に達していない場合は、冷媒の種類及びサーミスタ
が検出した外気温度に基づいて飽和圧力値を算出し、さ
らに、コントローラは、前記飽和圧力値を前記圧縮器の
吸入側圧力の基準値に置き換えることを特徴とする冷凍
装置。
2. The refrigerating apparatus according to claim 1, wherein the controller detects an operation start signal of the present refrigerating apparatus, and a value detected by the pressure sensor is detected even after a predetermined time has elapsed since the operation start signal was detected. When the reference value of the suction side pressure of the compressor has not been reached, the saturation pressure value is calculated based on the type of refrigerant and the outside air temperature detected by the thermistor, and further, the controller determines the saturation pressure value of the compressor. A refrigeration system in which the reference value of the suction side pressure is replaced.
【請求項3】 圧縮機、凝縮器、受液器、膨張弁及び蒸
発器を有してなる冷凍サイクルと、前記圧縮器の吸入側
圧力を検出する圧力センサと、外気温度を検出するサー
ミスタとを有し、前記圧縮器、凝縮器及び受液器をキャ
ビネット内に納めるとともに、前記キャビネットを屋外
に設置する冷凍装置において、予め設定してある圧縮器
の吸入側圧力の基準値と前記圧力センサによる検出値と
を比較して該検出値が該基準値以上になったときのみ冷
却運転を開始し、さらに、前記サーミスタが検出した外
気温度に応じて前記圧縮器の吸入側圧力の基準値を変更
することを特徴とする冷凍装置の運転制御方式。
3. A refrigeration cycle having a compressor, a condenser, a liquid receiver, an expansion valve and an evaporator, a pressure sensor for detecting a suction side pressure of the compressor, and a thermistor for detecting an outside air temperature. In the refrigerating device having the compressor, the condenser, and the liquid receiver in a cabinet and having the cabinet installed outdoors, a reference value of the suction side pressure of the compressor set in advance and the pressure sensor. The cooling operation is started only when the detected value becomes equal to or more than the reference value by comparing with the detected value by, and the reference value of the suction side pressure of the compressor is set according to the outside air temperature detected by the thermistor. A refrigeration system operation control method characterized by changing.
【請求項4】 請求項3記載の冷凍装置の運転制御方式
において、本冷凍装置についての運転開始信号を検出し
た時から所定時間経過後においても、圧力センサによる
検出値が圧縮器の吸入側圧力の基準値に達していない場
合は、冷媒の種類及びサーミスタが検出した外気温度に
基づいて飽和圧力値を算出し、さらに、前記飽和圧力値
を前記圧縮器の吸入側圧力の基準値に置き換えることを
特徴とする冷凍装置運転制御方式。
4. The operation control method for a refrigerating apparatus according to claim 3, wherein the value detected by the pressure sensor is the pressure on the suction side of the compressor even after a predetermined time has elapsed since the operation start signal for the present refrigerating apparatus was detected. If it does not reach the reference value of, the saturation pressure value is calculated based on the type of refrigerant and the outside air temperature detected by the thermistor, and further, the saturation pressure value is replaced with the reference value of the suction side pressure of the compressor. Refrigeration system operation control method characterized by.
JP210895A 1995-01-10 1995-01-10 Refrigerating device and operation control system therefor Pending JPH08189709A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP210895A JPH08189709A (en) 1995-01-10 1995-01-10 Refrigerating device and operation control system therefor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP210895A JPH08189709A (en) 1995-01-10 1995-01-10 Refrigerating device and operation control system therefor

Publications (1)

Publication Number Publication Date
JPH08189709A true JPH08189709A (en) 1996-07-23

Family

ID=11520161

Family Applications (1)

Application Number Title Priority Date Filing Date
JP210895A Pending JPH08189709A (en) 1995-01-10 1995-01-10 Refrigerating device and operation control system therefor

Country Status (1)

Country Link
JP (1) JPH08189709A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6474085B2 (en) 2001-02-27 2002-11-05 Masaki Uno Refrigerating apparatus
WO2006030776A1 (en) * 2004-09-13 2006-03-23 Daikin Industries, Ltd. Refrigerating device
KR100774090B1 (en) * 2004-09-13 2007-11-06 다이킨 고교 가부시키가이샤 Refrigerating device
JP2015215113A (en) * 2014-05-09 2015-12-03 日立アプライアンス株式会社 Refrigeration device
CN105509356A (en) * 2016-01-20 2016-04-20 佛山市顺德区美的饮水机制造有限公司 Water refrigeration device and refrigeration system and refrigeration method thereof
US20210063042A1 (en) * 2019-08-30 2021-03-04 Samsung Electronics Co., Ltd. Air conditioner and control method thereof

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6474085B2 (en) 2001-02-27 2002-11-05 Masaki Uno Refrigerating apparatus
WO2006030776A1 (en) * 2004-09-13 2006-03-23 Daikin Industries, Ltd. Refrigerating device
KR100774090B1 (en) * 2004-09-13 2007-11-06 다이킨 고교 가부시키가이샤 Refrigerating device
AU2005283464B2 (en) * 2004-09-13 2008-02-28 Daikin Industries, Ltd. Refrigeration system
CN100390474C (en) * 2004-09-13 2008-05-28 大金工业株式会社 Refrigerating device
JP2015215113A (en) * 2014-05-09 2015-12-03 日立アプライアンス株式会社 Refrigeration device
CN105509356A (en) * 2016-01-20 2016-04-20 佛山市顺德区美的饮水机制造有限公司 Water refrigeration device and refrigeration system and refrigeration method thereof
CN105509356B (en) * 2016-01-20 2018-07-13 佛山市顺德区美的饮水机制造有限公司 Water installations of freezing and its refrigeration system and refrigerating method
US20210063042A1 (en) * 2019-08-30 2021-03-04 Samsung Electronics Co., Ltd. Air conditioner and control method thereof

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