JP7011766B2

JP7011766B2 - Cooling device and its control method and control program

Info

Publication number: JP7011766B2
Application number: JP2018050622A
Authority: JP
Inventors: 和弥頴川; 盛力西嶋; 雅臣瀬戸
Original assignee: 三菱電機冷熱プラント株式会社
Priority date: 2018-03-19
Filing date: 2018-03-19
Publication date: 2022-01-27
Anticipated expiration: 2038-03-19
Also published as: JP2019163869A

Description

この発明は、冷却装置とその制御方法および制御プログラムに関するものである。
より詳しくは、正確かつ安定した運転ないし冷却状態を維持しつつ、省エネルギー性を向上させることができる冷却装置とその制御方法および制御プログラムに関するものであって、冷却技術に属するものである。
The present invention relates to a cooling device and its control method and control program.
More specifically, it relates to a cooling device capable of improving energy saving while maintaining accurate and stable operation or cooling state, and a control method and control program thereof, which belongs to cooling technology.

従来、一般的な冷却装置は、圧縮機、凝縮器（熱交換器）、絞り装置（膨張弁）及び蒸発器（熱交換器）が配管接続され、冷媒を循環させる冷媒回路を構成している。 Conventionally, in a general cooling device, a compressor, a condenser (heat exchanger), a throttle device (expansion valve), and an evaporator (heat exchanger) are connected by piping to form a refrigerant circuit for circulating refrigerant. ..

すなわち、この冷却装置は、冷媒が、蒸発、凝縮時に、熱交換対象となる空気等から吸熱、放熱することを利用して、管内の圧力を変化させながら冷却動作等を行うものである。 That is, this cooling device performs a cooling operation or the like while changing the pressure in the pipe by utilizing the fact that the refrigerant absorbs and dissipates heat from the air or the like to be heat exchanged at the time of evaporation and condensation.

近年、このような冷却装置においては、その冷却能力を維持しつつ、省エネルギーによる運転が望まれている。 In recent years, such a cooling device has been desired to be operated by energy saving while maintaining its cooling capacity.

このような冷却装置の一例が、特許文献１に開示されている。 An example of such a cooling device is disclosed in Patent Document 1.

例えば、特開２０１５－２３２４１１号公報（特許文献１）においては、庫内温度管理、冷凍装置システムの信頼性の確保、および、運転消費電力の低減を図ったプルダウン運転を実施する冷凍装置システムが提案されている。 For example, in Japanese Patent Application Laid-Open No. 2015-232411 (Patent Document 1), there is a refrigerating device system that performs pull-down operation for controlling the temperature inside the refrigerator, ensuring the reliability of the refrigerating device system, and reducing the operating power consumption. Proposed.

この冷凍装置システムは、駆動周波数が可変とされた圧縮機、凝縮器、膨張弁、及び蒸発器からなる冷凍サイクルと、
前記蒸発器で冷却された被冷却媒体が供給される冷蔵庫と、
前記冷蔵庫の庫内温度を検出する庫内温度センサと、
前記圧縮機の吸入圧力を検出する吸入圧力センサと、
前記庫内温度がサーモオン設定温度以上となった場合に前記冷凍サイクルの運転開始を指令し、前記庫内温度がサーモオフ設定温度以下となった場合に前記冷凍サイクルの運転停止を指令する制御手段と、を備え、
前記制御手段は、
予め入力された前記圧縮機の情報と、
前記サーモオフ設定温度へ到達するまでに設けられた周波数シフト設定温度と、
予め設定した周波数シフト設定吸入圧力と、に基づいて、
前記圧縮機の駆動周波数を適宜変更する運転モードを備えるものである。
This refrigeration system consists of a refrigeration cycle consisting of a compressor with variable drive frequency, a condenser, an expansion valve, and an evaporator.
A refrigerator to which the cooled medium cooled by the evaporator is supplied, and
An internal temperature sensor that detects the internal temperature of the refrigerator, and
An suction pressure sensor that detects the suction pressure of the compressor, and
As a control means for instructing the start of operation of the refrigeration cycle when the temperature inside the refrigerator is equal to or higher than the thermo-on set temperature and instructing the stop of operation of the refrigeration cycle when the temperature inside the refrigerator is equal to or lower than the thermo-off set temperature. , Equipped with
The control means is
The information of the compressor input in advance and
The frequency shift set temperature provided until the thermo-off set temperature is reached, and
Based on the preset frequency shift set suction pressure and
It is provided with an operation mode in which the drive frequency of the compressor is appropriately changed.

特開２０１５－２３２４１１号公報（特許請求の範囲）JP-A-2015-232411 (Claims)

前記特許文献１に開示されている冷凍装置システムは、圧縮機の駆動周波数のみを制御するもので、この制御のためのパラメータの一つとして、サーモオフ設定温度へ到達するまでに設けられた周波数シフト設定温度を使用するものである。
しかしながら、前記制御は、圧縮機の駆動周波数ないし回転数に基づいて行われるもので、冷凍装置の冷却能力などの他のパラメータを考慮したものではない。
したがって、正確かつ安定した運転状態を維持しつつ、省エネルギー性を向上させる点において、さらなる改善が求められている。 The refrigeration system disclosed in Patent Document 1 controls only the drive frequency of the compressor, and as one of the parameters for this control, the frequency shift provided until the thermo-off set temperature is reached. It uses the set temperature.
However, the control is performed based on the drive frequency or the rotation speed of the compressor, and does not take into consideration other parameters such as the cooling capacity of the refrigerating device.
Therefore, further improvement is required in terms of improving energy saving while maintaining an accurate and stable operating state.

この発明はかかる現状に鑑み、正確かつ安定した運転ないし冷却状態を維持しつつ、省エネルギー性を向上させることができる冷却装置とその制御方法および制御プログラムを提供することを目的としたものである。
In view of the present situation, it is an object of the present invention to provide a cooling device capable of improving energy saving while maintaining an accurate and stable operation or cooling state, and a control method and a control program thereof.

すなわち、この発明にかかる請求項１に記載の発明は、
圧縮機、凝縮器、蒸発器及びこれらを接続する冷媒配管を備え、制御装置及び圧力検出手段を備える冷却装置であって、
前記蒸発器は、
空気を取り込むための送風機を備え、
前記制御装置は、
冷媒の凝縮圧力及び蒸発圧力と前記圧縮機の駆動周波数と前記圧縮機の消費電力と前記冷却装置の冷却能力との関係を表すデータ、並びに前記送風機の駆動周波数と消費電力との関係を表すデータを記憶している記憶部と、
前記圧縮機及び送風機の各駆動周波数を、現在の設定値よりも所定の割合増減させて、新たな設定値に変更、再設定する設定部と、
前記圧力検出手段によって検出された凝縮圧力及び蒸発圧力の値並びに前記圧縮機の駆動周波数の前記設定値に対応する前記冷却装置の冷却能力の値と前記圧縮機の基準消費電力の値、前記圧力検出手段によって再度検出された凝縮圧力及び蒸発圧力の値並びに前記圧縮機の駆動周波数の前記再設定値に対応する前記冷却装置の冷却能力の値と前記圧縮機の再設定消費電力の値、前記送風機の駆動周波数の前記設定値に対応する前記送風機の基準消費電力の値、並びに前記送風機の駆動周波数の前記再設定値に対応する前記送風機の再設定消費電力の値のそれぞれを前記記憶部内のデータを参照して選択する選択部と、
前記選択部によって選択された前記圧力検出手段によって検出された凝縮圧力及び蒸発圧力の値並びに前記圧縮機の駆動周波数の前記設定値に対応する前記冷却装置の冷却能力の値と前記圧縮機の基準消費電力の値と前記送風機の基準消費電力の値から、所定の演算式を用いて、基準ＣＯＰを算出し、前記選択部によって選択された前記圧力検出手段によって再度検出された凝縮圧力及び蒸発圧力の値並びに前記圧縮機の駆動周波数の前記再設定値に対応する前記冷却装置の冷却能力の値と前記圧縮機の再設定消費電力の値と前記送風機の再設定消費電力の値から、前記所定の演算式を用いて、算出ＣＯＰを算出する演算部と、
前記基準ＣＯＰ値と前記算出ＣＯＰ値を比較して、前記算出ＣＯＰ値が、より適当なＣＯＰ値であるか否かを判定する判定部と、
前記判定部によって、より適当と判定されたＣＯＰの値に対応する駆動周波数で駆動するよう前記圧縮機と前記送風機を制御する制御部を備えること
を特徴とする冷却装置である。 That is, the invention according to claim 1 according to the present invention is
A cooling device including a compressor, a condenser, an evaporator, and a refrigerant pipe connecting them, and equipped with a control device and a pressure detecting means.
The evaporator is
Equipped with a blower to take in air,
The control device is
Data showing the relationship between the condensation pressure and evaporation pressure of the refrigerant, the drive frequency of the compressor, the power consumption of the compressor, and the cooling capacity of the cooling device, and the data showing the relationship between the drive frequency of the blower and the power consumption. And the storage part that remembers
A setting unit that changes and resets each drive frequency of the compressor and blower to a new set value by increasing or decreasing it by a predetermined ratio from the current set value.
The values of the condensing pressure and the evaporating pressure detected by the pressure detecting means, the value of the cooling capacity of the cooling device corresponding to the set value of the driving frequency of the compressor, the value of the reference power consumption of the compressor, and the pressure. The values of the condensing pressure and the evaporating pressure re -detected by the detecting means, the value of the cooling capacity of the cooling device corresponding to the reset value of the drive frequency of the compressor, and the value of the reset power consumption of the compressor, said. Each of the reference power consumption value of the blower corresponding to the set value of the drive frequency of the blower and the reset power consumption value of the blower corresponding to the reset value of the drive frequency of the blower are stored in the storage unit. A selection section that refers to and selects data, and
The value of the cooling capacity of the cooling device corresponding to the value of the condensing pressure and the evaporating pressure detected by the pressure detecting means selected by the selection unit and the setting value of the driving frequency of the compressor and the reference of the compressor. The reference COP is calculated from the value of the power consumption and the value of the reference power consumption of the blower by using a predetermined calculation formula, and the condensing pressure and the evaporation pressure again detected by the pressure detecting means selected by the selection unit. And the value of the cooling capacity of the cooling device corresponding to the reset value of the drive frequency of the compressor, the value of the reset power consumption of the compressor, and the value of the reset power consumption of the blower. The calculation unit that calculates the calculated COP using the calculation formula of
A determination unit that compares the reference COP value with the calculated COP value and determines whether or not the calculated COP value is a more appropriate COP value.
The cooling device includes a control unit that controls the compressor and the blower so as to drive the compressor at a drive frequency corresponding to a COP value determined to be more appropriate by the determination unit.

この発明の請求項２に記載の発明は、
請求項１に記載の冷却装置において、
前記圧力検出手段は、
前記凝縮器の出口側に配される前記凝縮圧力を検出する圧力検出手段と、前記圧縮機の吸込み側に配される前記蒸発圧力を検出する圧力検出手段で構成されていること
を特徴とするものである。 The invention according to claim 2 of the present invention
In the cooling device according to claim 1,
The pressure detecting means is
It is characterized by being composed of a pressure detecting means for detecting the condensation pressure arranged on the outlet side of the condenser and a pressure detecting means for detecting the evaporation pressure arranged on the suction side of the compressor. It is a thing.

この発明の請求項３に記載の発明は、
請求項１又は２に記載の冷却装置において、
前記演算式は、
前記冷却装置の冷却能力をＱ、圧縮機の消費電力をＥ_ｄ、前記送風機の消費電力をＥ_ｆとして、
ＣＯＰ＝Ｑ／（Ｅ_ｄ＋Ｅ_ｆ）
で表されること
を特徴とするものである。 The invention according to claim 3 of the present invention
In the cooling device according to claim 1 or 2.
The calculation formula is
_Let Q be the cooling capacity of the cooling device, Ed be the power consumption of the compressor, and E _f be the power consumption of the blower.
COP = Q / (E _d + E _f )
It is characterized by being represented by.

この発明の請求項４に記載の発明は、
請求項１又は２に記載の冷却装置において、
前記演算式は、
前記冷却装置の冷却能力をＱ、圧縮機の消費電力をＥ_ｄ、前記送風機の消費電力をＥ_ｆとして、
ＣＯＰ＝（Ｑ－Ｅ_ｆ）／（Ｅ_ｄ＋Ｅ_ｆ）
で表されること
を特徴とするものである。 The invention according to claim 4 of the present invention
In the cooling device according to claim 1 or 2.
The calculation formula is
_Let Q be the cooling capacity of the cooling device, Ed be the power consumption of the compressor, and E _f be the power consumption of the blower.
COP = (Q-E _f ) / (E _d + E _f )
It is characterized by being represented by.

さらに、この発明の請求項５に記載の発明は、
圧縮機、凝縮器、蒸発器及びこれらを接続する冷媒配管を備え、前記蒸発器に空気を取り込むための送風機、制御装置及び圧力検出手段を備える冷却装置の制御方法であって、
前記圧力検出手段によって冷媒の凝縮圧力及び蒸発圧力を検出し、検出された凝縮圧力及び蒸発圧力並びに前記圧縮機の駆動周波数の現在の設定値に対応する前記冷却装置の冷却能力の値と前記圧縮機の消費電力の値を基準値として得る工程と、
前記送風機の駆動周波数の現在の設定値に対応する前記送風機の消費電力の値を基準値として得る工程と、
前記冷却装置の冷却能力の値と前記圧縮機の基準消費電力値と前記送風機の基準消費電力値から、所定の演算式を用いて、基準ＣＯＰ値を算出する工程と、
前記基準ＣＯＰ値の算出後に、前記圧縮機及び前記送風機の各駆動周波数を、前記設定値よりも所定の割合増減させて、新たな設定値に変更、再設定する工程と、
再度、前記圧力検出手段によって冷媒の蒸発圧力及び凝縮圧力を検出し、検出された凝縮圧力及び蒸発圧力並びに前記圧縮機の前記再設定された駆動周波数の値に対応する前記冷却装置の冷却能力の値と前記圧縮機の再設定消費電力の値を得る工程と、
前記送風機の前記再設定された駆動周波数の値に対応する前記送風機の再設定消費電力の値を得る工程と、
前記冷却装置の冷却能力の値と前記圧縮機の再設定消費電力値と前記送風機の再設定消費電力値から、前記所定の演算式を用いて、算出ＣＯＰ値を算出する工程と、
前記基準ＣＯＰ値と前記算出ＣＯＰ値を比較して、前記算出ＣＯＰ値が、より適当なＣＯＰ値であるか否かを判定する工程と、
前記適当なＣＯＰ値に対応する駆動周波数で、前記圧縮機と前記送風機を制御する工程と、
を含むこと
を特徴とする冷却装置の制御方法である。 Further, the invention according to claim 5 of the present invention
A control method for a cooling device including a compressor, a condenser, an evaporator, and a refrigerant pipe connecting them, and a blower for taking air into the evaporator, a control device, and a pressure detecting means.
The pressure detecting means detects the condensation pressure and evaporation pressure of the refrigerant, and the value of the cooling capacity of the cooling device corresponding to the detected condensation pressure and evaporation pressure and the current set value of the drive frequency of the compressor and the compression. The process of obtaining the value of the power consumption of the machine as a reference value, and
A process of obtaining the value of the power consumption of the blower corresponding to the current set value of the drive frequency of the blower as a reference value, and
A step of calculating a reference COP value from the value of the cooling capacity of the cooling device, the reference power consumption value of the compressor, and the reference power consumption value of the blower by using a predetermined calculation formula.
After calculating the reference COP value, the drive frequencies of the compressor and the blower are increased / decreased by a predetermined ratio from the set value, and changed to a new set value and reset.
Again, the pressure detecting means detects the evaporation pressure and the condensation pressure of the refrigerant, and the cooling capacity of the cooling device corresponding to the detected condensation pressure and the evaporation pressure and the reset drive frequency value of the compressor. The process of obtaining the value and the reset power consumption value of the compressor, and
The step of obtaining the reset power consumption value of the blower corresponding to the reset drive frequency value of the blower, and the process of obtaining the reset power consumption value of the blower.
A step of calculating a calculated COP value from the value of the cooling capacity of the cooling device, the reset power consumption value of the compressor, and the reset power consumption value of the blower by using the predetermined calculation formula.
A step of comparing the reference COP value with the calculated COP value to determine whether or not the calculated COP value is a more appropriate COP value.
A step of controlling the compressor and the blower at a drive frequency corresponding to the appropriate COP value, and
It is a control method of a cooling device characterized by including.

この発明の請求項６に記載の発明は、
請求項５に記載の冷却装置の制御方法において、
前記冷却装置は、
温度検出手段をさらに備え、
前記制御方法は、
前記温度検出手段によって検出された庫内又は室内温度が周波数運転開始温度よりも低くなった場合に行われること
を特徴とするものである。 The invention according to claim 6 of the present invention
In the control method for the cooling device according to claim 5,
The cooling device is
Further equipped with temperature detection means,
The control method is
It is characterized in that it is performed when the temperature inside or inside the refrigerator detected by the temperature detecting means becomes lower than the frequency operation start temperature.

さらにまた、この発明の請求項７に記載の発明は、
圧縮機、凝縮器、蒸発器及びこれらを接続する冷媒配管を備え、前記蒸発器に空気を取り込むための送風機、制御装置及び圧力検出手段を備える冷却装置の制御プログラムであって、
コンピュータに、
冷媒の凝縮圧力及び蒸発圧力と前記圧縮機の駆動周波数と前記圧縮機の消費電力と前記冷却装置の冷却能力との関係を表すデータ、並びに前記送風機の駆動周波数と消費電力との関係を表すデータと、前記冷却装置の冷却能力の値と前記圧縮機の消費電力の値と前記送風機の消費電力の値からＣＯＰを算出する所定の演算式を格納するデータベースを保存する保存ステップと、
前記圧力検出手段から検出された冷媒の凝縮圧力及び蒸発圧力を取得する圧力取得ステップと、
前記圧縮機及び前記送風機の各駆動周波数の現在の設定値を基準値として取得する周波数取得ステップと、
前記データベースから、冷媒の凝縮圧力及び蒸発圧力と前記圧縮機の駆動周波数と前記圧縮機の消費電力と前記冷却装置の冷却能力との関係を表すデータと、前記送風機の駆動周波数と消費電力の関係を表すデータを読み出すデータ読み出しステップと、
前記圧力取得ステップにおいて取得した冷媒の凝縮圧力及び蒸発圧力並びに前記周波数取得ステップにおいて取得した圧縮機の駆動周波数の前記設定値に対応する前記冷却装置の冷却能力の値と前記圧縮機の基準消費電力の値を、前記データベースに格納されているデータを参照して選択すると共に、前記周波数取得ステップにおいて取得した送風機の駆動周波数の前記設定値に対応する前記送風機の基準消費電力の値を、前記データベースに格納されているデータを参照して選択する選択ステップと、
前記データベースから前記演算式を読み出す演算式読み出しステップと、
前記選択ステップにおいて選択された前記冷却装置の冷却能力の値と前記圧縮機の基準消費電力の値と前記送風機の基準消費電力の値を用い、前記演算式読み出しステップにおいて読み出された演算式に基づいて基準ＣＯＰを算出する基準ＣＯＰ算出ステップと、
前記圧縮機及び送風機の各駆動周波数を、前記設定値よりも所定の割合増減させて、新たな設定値に変更、再設定する周波数設定ステップと、
前記圧力検出手段から再度検出された冷媒の凝縮圧力及び蒸発圧力を取得する圧力再取得ステップと、
前記データベースから、再度、冷媒の凝縮圧力及び蒸発圧力と前記圧縮機の駆動周波数と前記圧縮機の消費電力と前記冷却装置の冷却能力との関係を表すデータと、前記送風機の駆動周波数と消費電力の関係を表すデータを読み出すデータ再読み出しステップと、
前記圧力再取得ステップにおいて取得した冷媒の凝縮圧力及び蒸発圧力並びに前記周波数設定ステップにおいて前記再設定された圧縮機の駆動周波数の値に対応する前記冷却装置の冷却能力の値と前記圧縮機の再設定消費電力の値を、前記データベースに格納されているデータを参照して選択すると共に、前記周波数設定ステップにおいて前記再設定された送風機の駆動周波数の値に対応する前記送風機の再設定消費電力の値を、前記データベースに格納されているデータを参照して選択する再選択ステップと、
前記データベースから前記演算式を再度読み出す演算式再読み出しステップと、
前記再選択ステップにおいて選択された前記冷却装置の冷却能力の値と前記圧縮機の再設定消費電力の値と前記送風機の再設定消費電力の値を用い、前記演算式再読み出しステップにおいて読み出された演算式に基づいて算出ＣＯＰを算出する算出ＣＯＰ算出ステップと、
前記基準ＣＯＰ値と前記算出ＣＯＰ値を比較して、前記算出ＣＯＰ値が、より適当なＣＯＰ値であるか否かを判定する判定ステップと、
前記判定ステップにおいて、より適当であると判定されたＣＯＰに対応する駆動周波数で前記圧縮機及び送風機を制御する制御ステップと、
を実行させること
を特徴とする冷却装置の制御プログラムである。
Furthermore, the invention according to claim 7 of the present invention
A control program for a cooling device including a compressor, a condenser, an evaporator, and a refrigerant pipe connecting them, and a blower, a control device, and a pressure detecting means for taking air into the evaporator.
On the computer
Data showing the relationship between the condensation pressure and evaporation pressure of the refrigerant, the drive frequency of the compressor, the power consumption of the compressor, and the cooling capacity of the cooling device, and the data showing the relationship between the drive frequency of the blower and the power consumption. And a saving step for saving a database storing a predetermined calculation formula for calculating COP from the value of the cooling capacity of the cooling device, the value of the power consumption of the compressor, and the value of the power consumption of the blower.
A pressure acquisition step for acquiring the condensation pressure and evaporation pressure of the refrigerant detected from the pressure detecting means, and
A frequency acquisition step of acquiring the current set value of each drive frequency of the compressor and the blower as a reference value, and
From the database, data showing the relationship between the condensation pressure and evaporation pressure of the refrigerant, the drive frequency of the compressor, the power consumption of the compressor, and the cooling capacity of the cooling device, and the relationship between the drive frequency and the power consumption of the blower. The data read step to read the data representing
The value of the cooling capacity of the cooling device corresponding to the set value of the condensation pressure and evaporation pressure of the refrigerant acquired in the pressure acquisition step and the drive frequency of the compressor acquired in the frequency acquisition step, and the reference power consumption of the compressor. The value of is selected with reference to the data stored in the database, and the value of the reference power consumption of the blower corresponding to the set value of the drive frequency of the blower acquired in the frequency acquisition step is selected in the database. A selection step to browse and select the data stored in
An arithmetic expression reading step for reading the arithmetic expression from the database, and
Using the value of the cooling capacity of the cooling device selected in the selection step, the value of the reference power consumption of the compressor, and the value of the reference power consumption of the blower, the calculation formula read in the calculation formula reading step is used. The standard COP calculation step to calculate the standard COP based on
The frequency setting step of changing and resetting each drive frequency of the compressor and the blower to a new set value by increasing / decreasing by a predetermined ratio from the set value, and
A pressure reacquisition step of acquiring the condensation pressure and evaporation pressure of the refrigerant detected again from the pressure detecting means, and
From the database again, data showing the relationship between the condensation pressure and evaporation pressure of the refrigerant, the drive frequency of the compressor, the power consumption of the compressor, and the cooling capacity of the cooling device, and the drive frequency and power consumption of the blower. The data re-reading step to read the data representing the relationship between
The cooling capacity value of the cooling device and the compressor re-acquisition corresponding to the condensation pressure and evaporation pressure of the refrigerant acquired in the pressure reacquisition step and the drive frequency value of the compressor reset in the frequency setting step. The value of the set power consumption is selected with reference to the data stored in the database, and the reset power consumption of the blower corresponding to the value of the drive frequency of the reset blower in the frequency setting step is selected. A reselection step to select a value by referring to the data stored in the database, and
The operation formula re-reading step of re-reading the calculation formula from the database, and the operation formula re-reading step.
Using the value of the cooling capacity of the cooling device selected in the reselection step, the value of the reset power consumption of the compressor, and the value of the reset power consumption of the blower, the values are read out in the arithmetic reread step. The calculated COP calculation step to calculate the calculated COP based on the calculated formula,
A determination step of comparing the reference COP value and the calculated COP value to determine whether or not the calculated COP value is a more appropriate COP value.
In the determination step, the control step for controlling the compressor and the blower at the drive frequency corresponding to the COP determined to be more appropriate, and the control step.
It is a control program of a cooling device characterized by executing.

この発明の冷却装置とその制御方法および制御プログラムは、圧力検出手段によって検出される冷媒の凝縮圧力および蒸発圧力ならびに前記圧縮機の駆動周波数の現在の設定値（例えば駆動当初の駆動周波数）に対応する前記冷却装置の冷却能力の値と前記圧縮機の消費電力（基準消費電力）の値と、前記送風機の駆動周波数の現在の設定値（例えば駆動当初の駆動周波数）に対応する前記送風機の消費電力（基準消費電力）の値を用い、所定の演算式を用いて算出した基準ＣＯＰを、その後に前記圧縮機および前記送風機の各駆動周波数を、前記設定値よりも所定の割合増減（例えば低下）させて、新たな設定値に変更・再設定して算出した算出ＣＯＰと比較し、より適当なＣＯＰであると判定された算出ＣＯＰの値に対応する駆動周波数で駆動するよう前記圧縮機および前記送風機を制御するものである。
したがって、正確かつ安定した運転ないし冷却状態が維持され、省エネルギー性が向上する。 The cooling device and its control method and control program of the present invention correspond to the current set values of the condensation pressure and evaporation pressure of the refrigerant detected by the pressure detecting means and the drive frequency of the compressor (for example, the drive frequency at the time of drive). The value of the cooling capacity of the cooling device, the value of the power consumption (reference power consumption) of the compressor, and the consumption of the blower corresponding to the current set value of the drive frequency of the blower (for example, the drive frequency at the time of drive). Using the value of power (reference power consumption), the reference COP calculated using a predetermined calculation formula is used, and then the drive frequencies of the compressor and the blower are increased / decreased (for example, decreased) by a predetermined ratio from the set value. ), And compared with the calculated COP calculated by changing / resetting to the new set value, the compressor and the compressor so as to drive at the drive frequency corresponding to the value of the calculated COP determined to be a more appropriate COP. It controls the blower.
Therefore, accurate and stable operation or cooling state is maintained, and energy saving is improved.

前記冷却装置においては、前記圧力検出手段として、前記凝縮圧力を検出するための圧力検出手段を、前記凝縮器の出口側に設け、前記蒸発圧力を検出するための圧力検出手段を、前記圧縮機の吸込み側に設けることができる。
このような構成によれば、前記凝縮器の出口側と前記圧縮機の吸込み側の二か所で検出された圧力値を使用して、より適当なＣＯＰを算出するので、前記冷却装置において、より正確かつ安定した運転状態（冷却能力）を維持することが可能となる。 In the cooling device, as the pressure detecting means, a pressure detecting means for detecting the condensed pressure is provided on the outlet side of the condenser, and the pressure detecting means for detecting the evaporation pressure is provided in the compressor. Can be provided on the suction side of.
According to such a configuration, a more appropriate COP is calculated by using the pressure values detected at the outlet side of the condenser and the suction side of the compressor, so that the cooling device can be used. It is possible to maintain a more accurate and stable operating state (cooling capacity).

前記冷却装置の制御方法については、前記冷却装置が備える温度検出手段によって検出された庫内または室内温度が周波数運転開始温度よりも低くなった後に、行うことができる。
このような構成によって、前記冷却装置において、安定した運転状態（冷却能力）を維持しつつ、効率よく冷却を行うことが可能となる。 The control method of the cooling device can be performed after the temperature inside the refrigerator or the room detected by the temperature detecting means included in the cooling device becomes lower than the frequency operation start temperature.
With such a configuration, it becomes possible to efficiently cool the cooling device while maintaining a stable operating state (cooling capacity).

前記冷却装置、その制御方法および制御プログラムにおいて、前記演算式として、下記演算式を用いることができる。
ＣＯＰ＝（Ｑ－Ｅ_ｆ）／（Ｅ_ｄ＋Ｅ_ｆ）
上記演算式を用いる場合には、冷却装置の冷却能力から送風機の消費電力分の発熱による影響が除外されるので、より正確なＣＯＰを算出することができ、その結果、極めて正確かつ安定な運転ないし冷却状態を維持することが可能となる。
In the cooling device, the control method thereof, and the control program, the following calculation formula can be used as the calculation formula.
COP = (Q-E _f ) / (E _d + E _f )
When the above formula is used, the influence of heat generated by the power consumption of the blower is excluded from the cooling capacity of the cooling device, so that a more accurate COP can be calculated, and as a result, extremely accurate and stable operation can be performed. Or it becomes possible to maintain a cooled state.

この発明にかかる冷却装置の一例を示す概念図である。It is a conceptual diagram which shows an example of the cooling apparatus which concerns on this invention. 図１に示す冷却装置を構成する制御装置が実施する、より適当なＣＯＰ値に基づく圧縮機および送風機の制御動作の手順の一例を示すフロー図である。FIG. 3 is a flow chart showing an example of a procedure for controlling a compressor and a blower based on a more appropriate COP value, which is carried out by a control device constituting the cooling device shown in FIG. 1. 圧縮機の駆動周波数に応じた、蒸発圧力と、凝縮圧力と、冷却装置の冷却能力および圧縮機の消費電力との関係を示すデータテーブルの一例を示す図である。It is a figure which shows an example of the data table which shows the relationship between the evaporation pressure, the condensation pressure, the cooling capacity of a cooling device, and the power consumption of a compressor according to the drive frequency of a compressor. 送風機に設定する駆動周波数と消費電力との関係を示すデータテーブルの一例を示す図である。It is a figure which shows an example of the data table which shows the relationship between the drive frequency set in a blower, and power consumption. 近似式の例を示す図であって、（Ａ）は、冷媒の蒸発圧力および凝縮圧力と図１に示す冷却装置の冷却能力の関係を示すもので、（Ｂ）は、冷媒の蒸発圧力および凝縮圧力と図１に示す冷却装置を構成する圧縮機の消費電力の関係を示すものである。It is a figure which shows the example of the approximate formula, (A) shows the relationship between the evaporation pressure and the condensation pressure of a refrigerant, and the cooling capacity of a cooling apparatus shown in FIG. It shows the relationship between the condensation pressure and the power consumption of the compressor constituting the cooling device shown in FIG. 図１に示す冷却装置によって冷却動作を行う手順の一例を示すフロー図である。It is a flow chart which shows an example of the procedure which performs the cooling operation by the cooling apparatus shown in FIG.

以下、この発明の冷却装置とその制御方法および制御プログラムの一実施の形態の構成を、図面を参照して説明する。
なお、この発明は、図面に示す形態にのみ限定されるものではなく、要旨を変更しない範囲内において種々改良を加えることができるものである。 Hereinafter, the configuration of the cooling device of the present invention, its control method, and one embodiment of the control program will be described with reference to the drawings.
The present invention is not limited to the form shown in the drawings, and various improvements can be made without changing the gist.

図１は、この発明にかかる冷却装置１の一例を示した概念図である。
図１に示すように、前記冷却装置１は、圧縮機２、凝縮器３、蒸発器４、および制御装置５を主要構成要素とするもので、前記圧縮機２、凝縮器３および蒸発器４の各構成要素は、冷媒配管で接続されている。
なお、図１において、冷却装置１は、冷蔵庫の庫内または室内を冷却するためのものとして構成されている。 FIG. 1 is a conceptual diagram showing an example of a cooling device 1 according to the present invention.
As shown in FIG. 1, the cooling device 1 includes a compressor 2, a condenser 3, an evaporator 4, and a control device 5 as main components, and the compressor 2, the condenser 3, and the evaporator 4 are the main components. Each component of is connected by a refrigerant pipe.
In FIG. 1, the cooling device 1 is configured to cool the inside or the room of the refrigerator.

図１において、前記凝縮器３の出口側には、冷媒の凝縮圧力（比較的高い圧力）を測定するための圧力検出手段（圧力測定センサ）６が配され、前記圧縮機２の吸込み側には、冷媒の蒸発圧力（比較的低い圧力）を測定するための圧力検出手段（圧力測定センサ）７が配されている。
したがって、前記冷却装置１では、前記凝縮器３の出口側と前記圧縮機２の吸込み側の二か所で検出された圧力値を使用して、より適当なＣＯＰを算出し、このＣＯＰ値に基づいて前記圧縮機２と前記蒸発器４の送風機４ａのそれぞれを制御するので、より正確かつ安定した運転ないし冷却状態（冷却能力）を維持することが可能となる In FIG. 1, a pressure detecting means (pressure measuring sensor) 6 for measuring the condensing pressure (relatively high pressure) of the refrigerant is arranged on the outlet side of the condenser 3, and is arranged on the suction side of the compressor 2. Is provided with a pressure detecting means (pressure measuring sensor) 7 for measuring the evaporation pressure (relatively low pressure) of the refrigerant.
Therefore, in the cooling device 1, a more appropriate COP is calculated by using the pressure values detected at the outlet side of the condenser 3 and the suction side of the compressor 2, and the COP value is used as the COP value. Since each of the compressor 2 and the blower 4a of the evaporator 4 is controlled based on this, it is possible to maintain a more accurate and stable operation or cooling state (cooling capacity).

なお、前記圧力検出手段の数については、凝縮圧力測定用と蒸発圧力測定用に少なくとも１つずつ配されていればよく、目的に応じて適宜変更することができる。
また、前記圧力検出手段に代えて、温度検出手段を用いて、検出された冷媒の凝縮温度および蒸発温度を、それぞれ凝縮圧力および蒸発圧力に換算するようにしてもよい。 The number of the pressure detecting means may be at least one for measuring the condensation pressure and one for measuring the evaporation pressure, and can be appropriately changed depending on the purpose.
Further, instead of the pressure detecting means, a temperature detecting means may be used to convert the detected condensation temperature and evaporation temperature of the refrigerant into the condensation pressure and the evaporation pressure, respectively.

前記圧縮機２は、冷媒を吸入して圧縮し、高温・高圧のガス状態にして吐出するものである。
この実施例において、前記圧縮機２は、インバータ回路などによって、その駆動周波数（ないし回転数）を制御し、冷媒の吐出量（吐出容量）を変化させることができるよう構成されたものである。 The compressor 2 sucks in a refrigerant, compresses it, and discharges it in a high-temperature, high-pressure gas state.
In this embodiment, the compressor 2 is configured so that its drive frequency (or rotation speed) can be controlled by an inverter circuit or the like to change the discharge amount (discharge capacity) of the refrigerant.

前記凝縮器３は、前記圧縮機２から吐出された冷媒と、例えば屋外ないし庫外の空気（外気）との熱交換を行い、冷媒を凝縮して液化させるものである。
なお、前記凝縮器３については、その所定の位置に送風機（ファン）を取り付けることによって、前記凝縮器３に外気を送り込み、前記凝縮器３に流入する冷媒との熱交換が促されるよう構成してもよい。 The condenser 3 exchanges heat between the refrigerant discharged from the compressor 2 and, for example, outdoor or outdoor air (outside air) to condense and liquefy the refrigerant.
The condenser 3 is configured to send outside air to the condenser 3 and promote heat exchange with the refrigerant flowing into the condenser 3 by attaching a blower (fan) to the condenser 3 at a predetermined position. May be.

前記蒸発器４は、冷却対象となる空気と前記凝縮器３によって凝縮された冷媒との熱交換を行い、冷媒に空気の熱を奪わせて蒸発させて気化させるものである。 The evaporator 4 exchanges heat between the air to be cooled and the refrigerant condensed by the condenser 3, and causes the refrigerant to take heat of the air to evaporate and vaporize it.

この発明において、前記蒸発器４は、送風機（ファン）４ａを備えており、この送風機４ａによって、冷却対象となる空気が供給されるよう構成されている。
この実施例において、前記送風機４ａは、インバータ回路などによって、その駆動周波数（ないし回転数）を制御し、前記空気の供給量（吐出容量）を変化させることができるよう構成されている。 In the present invention, the evaporator 4 includes a blower (fan) 4a, and the blower 4a is configured to supply air to be cooled.
In this embodiment, the blower 4a is configured so that the drive frequency (or rotation speed) thereof can be controlled by an inverter circuit or the like to change the supply amount (discharge capacity) of the air.

図１において、前記制御装置５は、取得部５ａ、記憶部５ｂ、設定部５ｃ、選択部５ｄ、演算部５ｅ、判定部５ｆ、および制御部５ｇで構成されている。
前記制御装置５は、前記圧力検出手段６によって検出された凝縮圧力と前記圧力検出手段７によって検出された蒸発圧力に応じて、常時、より適当なエネルギー消費効率（Coefficient Of Performance（ＣＯＰ））値を算出し、算出されたエネルギー消費効率値に対応する駆動周波数（ないし回転数）で駆動するよう、前記圧縮機２と前記蒸発器４が備える送風機４ａを制御する。 In FIG. 1, the control device 5 includes an acquisition unit 5a, a storage unit 5b, a setting unit 5c, a selection unit 5d, a calculation unit 5e, a determination unit 5f, and a control unit 5g.
The control device 5 always has a more appropriate Coefficient Of Performance (COP) value according to the condensation pressure detected by the pressure detecting means 6 and the evaporation pressure detected by the pressure detecting means 7. Is calculated, and the blower 4a included in the compressor 2 and the evaporator 4 is controlled so as to be driven at a drive frequency (or rotation speed) corresponding to the calculated energy consumption efficiency value.

前記取得部５ａは、圧力検出手段および温度検出手段などの各種の検出手段によって検出された圧力および温度、圧縮機２や送風機４ａの駆動周波数などの運転状態量を、データとして取得する機能を有するものである。 The acquisition unit 5a has a function of acquiring as data the pressure and temperature detected by various detection means such as the pressure detecting means and the temperature detecting means, and the operating state quantity such as the drive frequency of the compressor 2 and the blower 4a. It is a thing.

前記記憶部５ｂは、データベースを構築し得るもので、ＣＯＰ（基準ＣＯＰおよび算出ＣＯＰ）を算出するために利用される各種データを記憶する。
例えば、前記記憶部５ｂは、前記取得部５ａが取得した圧力や温度、圧縮機２や送風機４ａの駆動周波数や消費電力などの運転状態量に関するデータに加え、前記演算部５ｅによる演算結果、予め定められた定数、冷媒の物性値（飽和圧力、飽和温度）を計算する関数式や関数表（テーブル）などをデータとして記憶する。
なお、これらのデータについては、適宜テーブルやグラフ、数式（近似式等）などの形式で記憶させてもよい。
さらに、前記記憶部５ｂ内のデータは、必要に応じて参照、書き換えることが可能である。 The storage unit 5b can construct a database and stores various data used for calculating COP (reference COP and calculated COP).
For example, in the storage unit 5b, in addition to data related to operating state quantities such as pressure and temperature acquired by the acquisition unit 5a, drive frequency and power consumption of the compressor 2 and the blower 4a, the calculation result by the calculation unit 5e is obtained in advance. The specified constants, function formulas and function tables (tables) for calculating the physical property values (saturation pressure, saturation temperature) of the refrigerant are stored as data.
Note that these data may be stored in a format such as a table, a graph, or a mathematical formula (approximate formula, etc.) as appropriate.
Further, the data in the storage unit 5b can be referred to and rewritten as necessary.

この実施例において、前記記憶部５ｂは、冷媒の凝縮圧力と冷媒の蒸発圧力と圧縮機２の駆動周波数と冷却装置１の冷却能力と圧縮機２の消費電力の関係を表すデータ、ならびに送風機４ａの駆動周波数および消費電力の関係を表すデータを、それぞれテーブル形式で予め記憶し、後述する演算式を記憶している。 In this embodiment, the storage unit 5b includes data showing the relationship between the condensation pressure of the refrigerant, the evaporation pressure of the refrigerant, the drive frequency of the compressor 2, the cooling capacity of the cooling device 1, and the power consumption of the compressor 2, and the blower 4a. Data representing the relationship between the drive frequency and the power consumption of the above is stored in advance in a table format, and the calculation formula described later is stored.

さらに、前記記憶部５ｂ内には、図５に示される、蒸発圧力Ｐ_ｓおよび凝縮圧力Ｐ_ｄと冷却装置１の冷却能力Ｑの関係を示す近似式、ならびに蒸発圧力Ｐ_ｓおよび凝縮圧力Ｐ_ｄと圧縮機２の消費電力Ｅ_ｄの関係を示す近似式も格納されている。 Further, in the storage unit 5b, an approximate expression showing the relationship between the evaporation pressure P _s and the condensation pressure P _d and the cooling capacity Q of the cooling device 1 and the evaporation pressure P _s and the condensation pressure P _d are shown in FIG. An approximate expression showing the relationship between the power consumption _Ed of the compressor 2 and the power consumption Ed of the compressor 2 is also stored.

前記設定部５ｃは、前記圧縮機２および送風機４ａの駆動周波数を、現在の設定値を基準値（基準駆動周波数値）として、これよりも所定の割合増加または低下させて新たな設定値（再設定駆動周波数値）に変更、再設定する機能を有するものである。
なお、運転開始時においては、駆動当初に設定された駆動周波数の値が基準値とされる。 The setting unit 5c increases or decreases the drive frequency of the compressor 2 and the blower 4a by a predetermined ratio with the current set value as a reference value (reference drive frequency value) to obtain a new set value (re-setting value). It has a function to change and reset to the set drive frequency value).
At the start of operation, the value of the drive frequency set at the beginning of drive is used as the reference value.

前記選択部５ｄは、前記圧力検出手段（図１において圧力検出手段６，７）によって検出された冷媒の凝縮圧力および蒸発圧力と圧縮機２の駆動周波数として現在設定されている値（現在の設定値；基準駆動周波数）または圧縮機２の駆動周波数として前記設定部５ｃによって再設定された値（再設定駆動周波数）に対応する冷却装置１の冷却能力の値と圧縮機２の消費電力（基準消費電力）の値を、前記記憶部５ｂ内の各データ（例えばデータテーブル）を参照して選択する。 The selection unit 5d has values (current settings) currently set as the condensation pressure and evaporation pressure of the refrigerant detected by the pressure detecting means (pressure detecting means 6 and 7 in FIG. 1) and the drive frequency of the compressor 2. Value; reference drive frequency) or the value of the cooling capacity of the cooling device 1 corresponding to the value reset by the setting unit 5c (reset drive frequency) as the drive frequency of the compressor 2 and the power consumption of the compressor 2 (reference). The value of power consumption) is selected with reference to each data (for example, a data table) in the storage unit 5b.

前記選択部５ｄは、さらに、送風機４ａの駆動周波数として現在設定されている値（現在の設定値；基準駆動周波数）に対応する送風機４ａの消費電力（基準消費電力）の値、または送風機４ａの駆動周波数として前記設定部５ｃによって再設定された値（再設定駆動周波数）に対応する送風機４ａの消費電力（再設定消費電力）の値を、前記記憶部５ｂ内の各データを参照して選択する。 The selection unit 5d further determines the value of the power consumption (reference power consumption) of the blower 4a corresponding to the value currently set as the drive frequency of the blower 4a (current set value; reference drive frequency), or the value of the blower 4a. The value of the power consumption (reset power consumption) of the blower 4a corresponding to the value reset by the setting unit 5c (reset drive frequency) as the drive frequency is selected with reference to each data in the storage unit 5b. do.

前記演算部５ｅは、前記選択部５ｄによって選択された冷却装置１の冷却能力の値と圧縮機２の消費電力（基準消費電力または再設定消費電力）の値と送風機４ａの消費電力（基準消費電力または再設定消費電力）の値を用い、前記冷却装置１の冷却能力値と前記圧縮機２の消費電力値と前記送風機４ａの消費電力値からＣＯＰを算出する所定の演算式に基づいて、ＣＯＰ（基準ＣＯＰまたは算出ＣＯＰ）を算出する。
なお、前記演算式は、予め記憶部５ｂ内に格納しておいてもよいし、演算部５ｅ内に直接記憶させておいてもよい。 The calculation unit 5e has a value of the cooling capacity of the cooling device 1 selected by the selection unit 5d, a value of the power consumption of the compressor 2 (reference power consumption or reset power consumption), and the power consumption of the blower 4a (reference consumption). Using the value of (power or reset power consumption), the COP is calculated from the cooling capacity value of the cooling device 1, the power consumption value of the compressor 2, and the power consumption value of the blower 4a, based on a predetermined calculation formula. Calculate COP (reference COP or calculated COP).
The calculation formula may be stored in the storage unit 5b in advance, or may be directly stored in the calculation unit 5e.

前記演算式としては、例えば、下記演算式（１）を用いることができる。
ＣＯＰ＝Ｑ／（Ｅ_ｄ＋Ｅ_ｆ）・・・（１） As the calculation formula, for example, the following calculation formula (1) can be used.
COP = Q / (E _d + E _f ) ・・・ (1)

上記式中、Ｑは、冷却装置（ないし冷却システム）の冷却能力［ｋｗ］、Ｅ_ｄは、圧縮機の消費電力［ｋｗ］、Ｅ_ｆは、送風機の消費電力［ｋｗ］である。 In the above formula, Q is the cooling capacity [kw] of the cooling device (or the cooling system), Ed is the power consumption of the compressor [ _kw ], and _Ef is the power consumption of the blower [kw].

なお、上記演算式（１）に代えて、下記演算式（２）を用いることもできる。
ＣＯＰ＝（Ｑ－Ｅ_ｆ）／（Ｅ_ｄ＋Ｅ_ｆ）・・・（２） In addition, the following calculation formula (2) can be used instead of the above calculation formula (1).
COP = (Q-E _f ) / (E _d + E _f ) ... (2)

上記演算式（２）を選択する場合には、前記冷却能力Ｑから前記送風機の消費電力Ｅ_ｆ分の発熱による影響を除外して、より正確な値を算出することができるので、前記冷却装置１において、極めて正確かつ安定な運転ないし冷却状態（冷却能力）を維持することが可能となる。 When the above calculation formula (2) is selected, a more accurate value can be calculated by excluding the influence of heat generation corresponding to the power consumption _Ef of the blower from the cooling capacity Q, so that the cooling device can be calculated. In No. 1, it is possible to maintain an extremely accurate and stable operation or cooling state (cooling capacity).

前記判定部５ｆは、圧縮機２および送風機４ａの各駆動周波数として前記現在の設定値を用いて前記演算部５ｅにより算出された基準ＣＯＰと、圧縮機２および送風機４ａの各駆動周波数として前記再設定値を用いて前記演算部５ｅにより算出された算出ＣＯＰとを比較し、算出ＣＯＰの値が基準ＣＯＰの値よりも大きいか否か（算出ＣＯＰがより適したものであるか否か）を判定する機能を有する。 The determination unit 5f has a reference COP calculated by the calculation unit 5e using the current set values as the drive frequencies of the compressor 2 and the blower 4a, and the repeat as the drive frequencies of the compressor 2 and the blower 4a. Compare with the calculated COP calculated by the calculation unit 5e using the set value, and determine whether the value of the calculated COP is larger than the value of the reference COP (whether the calculated COP is more suitable). It has a function to judge.

さらに、前記判定部５ｆは、後述するように、温度検出手段９で検出された現在の温度（庫内ないし室内等の現在の温度）が、周波数運転開始温度よりも低いか否かを判定すると共に、所定の制御動作（駆動周波数制御動作）を行った後に検出された温度が、停止温度よりも低いか否かを判定する。 Further, as will be described later, the determination unit 5f determines whether or not the current temperature (current temperature inside the refrigerator or indoors) detected by the temperature detecting means 9 is lower than the frequency operation start temperature. At the same time, it is determined whether or not the temperature detected after performing a predetermined control operation (drive frequency control operation) is lower than the stop temperature.

なお、本書において、「周波数運転開始温度」とは、予め設定された所定の温度をいい、「停止温度」とは、予め設定された所定の温度であって、周波数運転開始温度よりも低い温度をいう。 In this document, the "frequency operation start temperature" means a preset predetermined temperature, and the "stop temperature" is a preset predetermined temperature, which is lower than the frequency operation start temperature. To say.

前記制御部５ｇは、前記判定部５ｆによって常時出力される適当なＣＯＰ値に対応する駆動周波数の値に基づいて、前記圧縮機２および前記送風機４ａの各駆動周波数を制御する。 The control unit 5g controls each drive frequency of the compressor 2 and the blower 4a based on the value of the drive frequency corresponding to the appropriate COP value constantly output by the determination unit 5f.

かかる制御装置によれば、検出された凝縮圧力および蒸発圧力の二つの圧力（実測値）下において、より適当なＣＯＰ値を算出し、このＣＯＰ値に基づいて設定された駆動周波数（より適当な駆動周波数）で、前記圧縮機と前記送風機の両方を制御するので、冷却装置において、正確かつ安定した運転状態を維持することができる。
その結果、冷却装置において安定した性能と省エネルギーを実現することが可能となる。 According to such a control device, a more appropriate COP value is calculated under the two pressures (measured value) of the detected condensation pressure and evaporation pressure, and the drive frequency set based on this COP value (more appropriate value). Since both the compressor and the blower are controlled by the drive frequency), it is possible to maintain an accurate and stable operating state in the cooling device.
As a result, it becomes possible to realize stable performance and energy saving in the cooling device.

なお、図１において、前記凝縮器３および前記蒸発器４間には、膨張弁８が設けられている。
前記膨張弁８は、一方側が配管を介して前記凝縮器３に接続され、他方側が配管を介して前記蒸発器４に接続されるもので、前記圧縮機２から供給される冷媒の圧力が適当なものになるよう、所定の開度とすることによって、前記冷媒を適宜減圧・膨張させるものである。
前記膨張弁８の開度については、公知の制御装置を使用して、前記圧縮機２から供給される冷媒の圧力や温度などに応じて、その制御が自動的に行われるようにしてもよい。 In FIG. 1, an expansion valve 8 is provided between the condenser 3 and the evaporator 4.
One side of the expansion valve 8 is connected to the condenser 3 via a pipe, and the other side is connected to the evaporator 4 via a pipe, and the pressure of the refrigerant supplied from the compressor 2 is appropriate. The refrigerant is appropriately depressurized and expanded by setting a predetermined opening degree so as to have a certain degree.
The opening degree of the expansion valve 8 may be automatically controlled by using a known control device according to the pressure and temperature of the refrigerant supplied from the compressor 2. ..

かかる構成の冷却装置において、適当なＣＯＰ値の算出、ならびにこのＣＯＰ値に基づく圧縮機および送風機の駆動周波数制御動作は、例えば、以下のようにして行われる。 In the cooling device having such a configuration, the calculation of an appropriate COP value and the drive frequency control operation of the compressor and the blower based on the COP value are performed, for example, as follows.

図２に示すように、圧縮機２および送風機４ａのそれぞれを所定の駆動周波数で駆動させている状態で（ステップＳ１）制御動作が開始されると、取得部５ａが、現在、圧縮機２に設定されている駆動周波数の値と、送風機４ａに設定されている駆動周波数の値を、それぞれ基準値（基準駆動周波数値）として取得する（ステップＳ２）。
なお、この実施例において、前記圧縮機２の駆動周波数と送風機４ａの駆動周波数は、短時間で所定の温度まで冷却されるよう冷却装置１の冷却能力を最大化すべく、いずれも最大駆動周波数になるように設定されている。 As shown in FIG. 2, when the control operation is started in a state where each of the compressor 2 and the blower 4a is driven at a predetermined drive frequency (step S1), the acquisition unit 5a is currently connected to the compressor 2. The set drive frequency value and the drive frequency value set in the blower 4a are acquired as reference values (reference drive frequency values) (step S2).
In this embodiment, the drive frequency of the compressor 2 and the drive frequency of the blower 4a are both set to the maximum drive frequencies in order to maximize the cooling capacity of the cooling device 1 so as to be cooled to a predetermined temperature in a short time. It is set to be.

さらに、取得部５ａは、圧力検出手段６で検出される冷媒の現在の凝縮圧力（実測値）と、圧力検出手段７で検出される冷媒の現在の蒸発圧力（実測値）を取得する（ステップＳ３）。 Further, the acquisition unit 5a acquires the current condensation pressure (measured value) of the refrigerant detected by the pressure detecting means 6 and the current evaporation pressure (measured value) of the refrigerant detected by the pressure detecting means 7 (step). S3).

つづいて、ステップＳ４で、取得部５ａは、ステップＳ２で取得した各駆動周波数データとステップＳ３で取得した各圧力データを選択部５ｄに送る。 Subsequently, in step S4, the acquisition unit 5a sends each drive frequency data acquired in step S2 and each pressure data acquired in step S3 to the selection unit 5d.

記憶部５ｂは、冷媒の凝縮圧力Ｐ_ｄおよび蒸発圧力Ｐ_ｓと前記圧縮機２の駆動周波数Ｆ_ｄと前記圧縮機の消費電力Ｅ_ｄと前記冷却装置１の冷却能力Ｑとの関係を表すデータを記憶している。 The storage unit 5b is data representing the relationship between the condensation pressure P _d and the evaporation pressure P _s of the refrigerant, the drive frequency F _d of the compressor 2, the power consumption _Ed of the compressor, and the cooling capacity Q of the cooling device 1. I remember.

具体的には、これらのデータは、記憶部５ｂ内に、図３に示されるように、テーブル形式で（データテーブルとして）記憶されている。
図３に示されるデータテーブル（冷却能力データテーブル）は、蒸発圧力Ｐ_ｓと凝縮圧力Ｐ_ｄに応じて設定された冷却装置の冷却能力Ｑおよび圧縮機の消費電力Ｅ_ｄを、任意に設定された圧縮機２の駆動周波数Ｆ_ｄ毎に定めたものである。
記憶部５ｂ内には、これと同様のデータテーブルが、圧縮機２の、所定の駆動周波数に応じて複数作成され、格納されている。
すなわち、記憶部５ｂは、圧縮機２の駆動周波数Ｆ_ｄに応じた、冷媒の凝縮圧力Ｐ_ｄおよび蒸発圧力Ｐ_ｓと冷却装置１の冷却能力Ｑと圧縮機２の消費電力Ｅ_ｄとの関係を表す冷却能力データを記憶している。 Specifically, these data are stored in the storage unit 5b in a table format (as a data table) as shown in FIG.
In the data table (cooling capacity data table) shown in FIG. 3, the cooling capacity Q of the cooling device and the power consumption _Ed of the compressor set according to the evaporation pressure P _s and the condensation pressure P _d are arbitrarily set. It is determined for each drive frequency _Fd of the compressor 2.
A plurality of similar data tables are created and stored in the storage unit 5b according to a predetermined drive frequency of the compressor 2.
That is, the storage unit 5b has a relationship between the condensation pressure P _d and the evaporation pressure P _s of the refrigerant, the cooling capacity Q of the cooling device 1, and the power consumption _Ed of the compressor 2 according to the drive frequency F _d of the compressor 2. The cooling capacity data representing the above is stored.

さらに、記憶部５ｂは、図４に示される、送風機４ａに設定される駆動周波数Ｆ_ｆと消費電力Ｅ_ｆの関係を表す送風機データを、テーブル形式で記憶し、前記冷却装置１の冷却能力Ｑと前記圧縮機２の消費電力Ｅ_ｄと前記送風機４ａの消費電力Ｅ_ｆの各値からＣＯＰを算出する所定の演算式、具体的には、上記演算式（１）または（２）を記憶している。 Further, the storage unit 5b stores the blower data showing the relationship between the drive frequency _Ff set in the blower 4a and the power consumption _Ef shown in FIG. 4 in a table format, and stores the cooling capacity Q of the cooling device 1. And a predetermined calculation formula for calculating COP from each value of the power consumption _{Ed of the compressor 2 and the power consumption E f} _of the blower 4a, specifically, the above calculation formula (1) or (2) is stored. ing.

ステップＳ５で、前記選択部５ｄは、前記記憶部５ｂ内に格納されている冷却能力データテーブルを参照して、前記圧力検出手段６，７によって検出された凝縮圧力および蒸発圧力ならびに圧縮機２の前記基準駆動周波数に対応する冷却装置１の冷却能力の値と圧縮機２の消費電力（基準消費電力）の値を選択し、演算部５ｅに送る。 In step S5, the selection unit 5d refers to the cooling capacity data table stored in the storage unit 5b, and refers to the condensation pressure and evaporation pressure detected by the pressure detecting means 6 and 7 as well as the compressor 2. The value of the cooling capacity of the cooling device 1 corresponding to the reference drive frequency and the value of the power consumption (reference power consumption) of the compressor 2 are selected and sent to the calculation unit 5e.

ステップＳ６で、前記選択部５ｄは、さらに、前記記憶部５ｂ内に格納されているテーブル形式の送風機データ（送風機データテーブル）を参照して、送風機４ａの前記基準駆動周波数に対応する送風機４ａの消費電力（基準消費電力）の値を選択し、演算部５ｅに送る。 In step S6, the selection unit 5d further refers to the table-type blower data (blower data table) stored in the storage unit 5b, and the blower 4a corresponding to the reference drive frequency of the blower 4a. A value of power consumption (reference power consumption) is selected and sent to the calculation unit 5e.

さらに、ステップＳ７に進み、演算部５ｅは、記憶部５ｂから前記演算式を読み出し、ステップＳ５で選択された冷却装置１の冷却能力値および圧縮機２の基準消費電力値とステップＳ６で選択された送風機４ａの基準消費電力値を用い、前記演算式に基づいて、基準値としてのＣＯＰ（基準ＣＯＰ）を算出し、記憶部５ｂに送る。 Further, the process proceeds to step S7, and the calculation unit 5e reads the calculation formula from the storage unit 5b, selects the cooling capacity value of the cooling device 1 selected in step S5, the reference power consumption value of the compressor 2, and step S6. Using the reference power consumption value of the blower 4a, a COP (reference COP) as a reference value is calculated based on the above calculation formula and sent to the storage unit 5b.

ステップＳ８において、設定部５ｃは、圧縮機２および／または送風機４ａの各駆動周波数を、前記設定値（基準値）から所定の値まで低下させて、新たな設定値に変更、再設定する。 In step S8, the setting unit 5c lowers each drive frequency of the compressor 2 and / or the blower 4a from the set value (reference value) to a predetermined value, and changes and resets the set value to a new set value.

つづいて、ステップＳ９で、制御部５ｇは、前記設定部５ｃによって再設定された駆動周波数（再設定駆動周波数）で駆動するよう圧縮機２および／または送風機４ａを制御する。
その際、圧縮機２および／または送風機４ａの駆動周波数を、圧縮機２および／または送風機４ａの機種やシステム等に応じて、所定の割合、増減させ、この駆動周波数で駆動するよう圧縮機２および／または送風機４ａを制御してもよい。
これにより、算出ＣＯＰに基づいて、圧縮機２および／または送風機４ａの機種やシステム等を考慮して選択された駆動周波数で圧縮機２および／または送風機４ａが駆動するので、冷却装置において、より正確な運転ないし冷却状態を維持することが可能となる。 Subsequently, in step S9, the control unit 5g controls the compressor 2 and / or the blower 4a so as to drive at the drive frequency (reset drive frequency) reset by the setting unit 5c.
At that time, the drive frequency of the compressor 2 and / or the blower 4a is increased or decreased by a predetermined ratio according to the model and system of the compressor 2 and / or the blower 4a, and the compressor 2 is driven at this drive frequency. And / or the blower 4a may be controlled.
As a result, the compressor 2 and / or the blower 4a is driven at a drive frequency selected in consideration of the model and system of the compressor 2 and / or the blower 4a based on the calculated COP. It is possible to maintain accurate operation or cooling condition.

その後、ステップＳ１０で、取得部５ａは、圧力検出手段６で検出される冷媒の現在の凝縮圧力と、圧力検出手段７で検出される冷媒の現在の蒸発圧力を取得し、取得した各圧力データを選択部５ｄに送る。 After that, in step S10, the acquisition unit 5a acquires the current condensation pressure of the refrigerant detected by the pressure detecting means 6 and the current evaporation pressure of the refrigerant detected by the pressure detecting means 7, and each pressure data acquired. To the selection unit 5d.

さらに、ステップＳ１１に進み、前記選択部５ｄは、前記記憶部５ｂ内に格納されている冷却能力データテーブルを参照して、前記圧力検出手段６，７によって検出された凝縮圧力および蒸発圧力ならびにステップＳ８で圧縮機２に再設定された駆動周波数の値に対応する冷却装置１の冷却能力の値と圧縮機２の消費電力（再設定消費電力）の値を選択し、演算部５ｅに送る。 Further, the process proceeds to step S11, and the selection unit 5d refers to the cooling capacity data table stored in the storage unit 5b, and the condensation pressure and evaporation pressure detected by the pressure detecting means 6 and 7 and the step. The value of the cooling capacity of the cooling device 1 corresponding to the value of the drive frequency reset to the compressor 2 in S8 and the value of the power consumption (reset power consumption) of the compressor 2 are selected and sent to the calculation unit 5e.

ステップＳ１２で、前記選択部５ｄは、さらに、前記記憶部５ｂ内に格納されている送風機データテーブルを参照して、ステップＳ８で再設定された送風機４ａの駆動周波数の値に対応する送風機４ａの消費電力（再設定消費電力）の値を選択し、演算部５ｅに送る。 In step S12, the selection unit 5d further refers to the blower data table stored in the storage unit 5b, and the blower 4a corresponding to the drive frequency value of the blower 4a reset in step S8. The value of power consumption (reset power consumption) is selected and sent to the calculation unit 5e.

つづいて、ステップＳ１３で、演算部５ｅは、記憶部５ｂから前記演算式を読み出し、ステップＳ１１で選択された冷却装置１の冷却能力値と圧縮機２の再設定消費電力値とステップＳ１２で選択された送風機４ａの再設定消費電力値を用い、前記演算式に基づいて、ＣＯＰ（算出ＣＯＰ）を算出し、記憶部５ｂに送る。 Subsequently, in step S13, the calculation unit 5e reads the calculation formula from the storage unit 5b, selects the cooling capacity value of the cooling device 1 selected in step S11, the reset power consumption value of the compressor 2, and the step S12. The COP (calculated COP) is calculated based on the above-mentioned calculation formula using the reset power consumption value of the blower 4a, and is sent to the storage unit 5b.

さらに、ステップＳ１４に進み、判定部５ｆは、記憶部５ｂから、ステップＳ７で算出された基準ＣＯＰとステップ１３で算出された算出ＣＯＰを読み出して、基準ＣＯＰと算出ＣＯＰとを比較し、算出ＣＯＰが基準ＣＯＰよりも大きいか否かを判定する。 Further, the process proceeds to step S14, and the determination unit 5f reads out the reference COP calculated in step S7 and the calculated COP calculated in step 13 from the storage unit 5b, compares the reference COP with the calculated COP, and calculates the COP. Is greater than the reference COP.

ステップＳ１４において、判定部５ｆによって、算出ＣＯＰの値が基準ＣＯＰの値よりも大きい（算出ＣＯＰ＞基準ＣＯＰ）と判定されると、判定部５ｆは、算出ＣＯＰが、より適当な（効率の良い）ＣＯＰであると判断して、ステップＳ１４での判断は“Ｙｅｓ”となる。
その後、ステップＳ８に戻り、再度、圧縮機２および送風機４ａの各駆動周波数が、現在の設定値（基準値）から所定の値まで低下され、新たな設定値に変更、再設定され、しかるのち、ステップＳ１３でＣＯＰの算出が行われる。 In step S14, when the determination unit 5f determines that the value of the calculated COP is larger than the value of the reference COP (calculated COP> reference COP), the determination unit 5f determines that the calculated COP is more appropriate (efficient). ) It is determined that it is a COP, and the determination in step S14 is "Yes".
After that, the process returns to step S8, and the drive frequencies of the compressor 2 and the blower 4a are lowered from the current set value (reference value) to a predetermined value, changed to a new set value, and then reset. , COP is calculated in step S13.

一方、ステップＳ１４において、判定部５ｆによって、算出ＣＯＰの値が基準ＣＯＰの値よりも大きくないと判定されると、ステップＳ１４での判断は“Ｎｏ”となり、ステップＳ１５に進む。 On the other hand, if the determination unit 5f determines in step S14 that the value of the calculated COP is not larger than the value of the reference COP, the determination in step S14 becomes "No", and the process proceeds to step S15.

ステップＳ１５において、判定部５ｆは、圧縮機２および送風機４ａの各駆動周波数をステップ８において再設定された駆動周波数よりも高いがステップ２における基準駆動周波数以下の駆動周波数に、それぞれ変更・再設定するよう設定部５ｃに指示し、制御部５ｇは、この再設定された駆動周波数で駆動するよう送風機４ａを制御する。
その際、圧縮機２および／または送風機４ａの駆動周波数を、その機種やシステム等に応じて、所定の割合、増減させ、この駆動周波数で駆動するように圧縮機２および／または送風機４ａを制御してもよい。
これにより、算出ＣＯＰに基づいて、圧縮機２および／または送風機４ａの機種やシステム等を考慮して選択された駆動周波数で圧縮機２および／または送風機４ａが駆動するので、より正確な運転ないし冷却状態を維持することが可能となる。
その後、ステップＳ１０に戻り、再度、圧力検出手段６，７によって検出される冷媒の現在の凝縮圧力と蒸発圧力の取得が行われ、しかるのち、ステップＳ１３でＣＯＰの算出が行われる。 In step S15, the determination unit 5f changes and resets each drive frequency of the compressor 2 and the blower 4a to a drive frequency higher than the drive frequency reset in step 8 but lower than the reference drive frequency in step 2, respectively. The setting unit 5c is instructed to do so, and the control unit 5g controls the blower 4a to drive at the reset driving frequency.
At that time, the drive frequency of the compressor 2 and / or the blower 4a is increased or decreased by a predetermined ratio according to the model, system, or the like, and the compressor 2 and / or the blower 4a is controlled so as to be driven at this drive frequency. You may.
As a result, the compressor 2 and / or the blower 4a is driven at a drive frequency selected in consideration of the model and system of the compressor 2 and / or the blower 4a based on the calculated COP, so that more accurate operation or It becomes possible to maintain a cooled state.
After that, the process returns to step S10, the current condensation pressure and evaporation pressure of the refrigerant detected by the pressure detecting means 6 and 7 are acquired again, and then the COP is calculated in step S13.

かかる処理動作を行うことによって、常時、適当なＣＯＰ（算出ＣＯＰ）が算出され、この算出ＣＯＰに基づく駆動周波数値で駆動するよう、前記圧縮機２および前記送風機４ａのそれぞれが制御されるので、冷却装置ないし冷却システムにおいて、正確かつ安定した運転状態が維持されつつ、省エネルギーが実現される。 By performing such a processing operation, an appropriate COP (calculated COP) is always calculated, and each of the compressor 2 and the blower 4a is controlled so as to be driven by a drive frequency value based on the calculated COP. Energy saving is realized while maintaining an accurate and stable operating state in the cooling device or the cooling system.

なお、この実施例では、ステップＳ１４での判断が“Ｙｅｓ”となった場合、算出されたＣＯＰの値（算出ＣＯＰ値）を適当なＣＯＰの値として出力し、算出ＣＯＰの値が、基準となるＣＯＰの値（基準ＣＯＰ値）よりも高くならない範囲で維持されるようにしているが、前記算出されたＣＯＰの値を基準ＣＯＰに置き換えて、上記ステップ８からステップ１４を所定回数繰り返して、最適なＣＯＰを算出してもよい。 In this embodiment, when the determination in step S14 is "Yes", the calculated COP value (calculated COP value) is output as an appropriate COP value, and the calculated COP value is used as a reference. Although it is maintained within a range not higher than the COP value (reference COP value), the calculated COP value is replaced with the reference COP, and steps 8 to 14 are repeated a predetermined number of times. The optimum COP may be calculated.

かかる構成の冷却装置による冷却動作を、例えば、以下のようにして行うことができるが、この実施例にのみ限定されるものではない。 The cooling operation by the cooling device having such a configuration can be performed, for example, as follows, but the cooling operation is not limited to this embodiment.

図１において、前記冷却装置１は、庫内ないし室内温度測定用の温度検出手段（温度センサ）９を備えている。 In FIG. 1, the cooling device 1 includes a temperature detecting means (temperature sensor) 9 for measuring the temperature inside or inside a refrigerator.

冷却動作が開始されると、図６に示すように、圧縮機２および送風機４ａを駆動させている状態で（ステップＳ１０１）、取得部５ａが、温度検出手段９で検出される現在の温度（庫内ないし室内温度）を取得し、取得した温度データを判定部５ｆに送る（ステップＳ１０２）。 When the cooling operation is started, as shown in FIG. 6, the current temperature detected by the temperature detecting means 9 (step S101) while the compressor 2 and the blower 4a are being driven (step S101). (Inside or indoor temperature) is acquired, and the acquired temperature data is sent to the determination unit 5f (step S102).

つづいて、ステップＳ１０３で、判定部５ｆは、ステップＳ１０２で取得された温度が、記憶部５ｂ内に格納されている周波数運転開始温度よりも低いか否かを判定する。
その際、ステップＳ１０２で取得された温度が周波数運転開始温度よりも低いか否かは、例えば、所定の誤差範囲に収まっている旨の条件を充足するか否かに基づいて判定してもよい。 Subsequently, in step S103, the determination unit 5f determines whether or not the temperature acquired in step S102 is lower than the frequency operation start temperature stored in the storage unit 5b.
At that time, whether or not the temperature acquired in step S102 is lower than the frequency operation start temperature may be determined based on, for example, whether or not the condition that the temperature is within a predetermined error range is satisfied. ..

ステップＳ１０３において、判定部５ｆによって、ステップＳ１０２で取得された温度が、記憶部５ｂ内に格納されている周波数運転開始温度よりも低いと判定されると、ステップＳ１０３での判断は“Ｙｅｓ”となり、判定部５ｆは、取得部５ａに対して、前記圧縮機および送風機の駆動周波数制御動作を行うよう指示して、ステップＳ１０４に進む。 In step S103, when the determination unit 5f determines that the temperature acquired in step S102 is lower than the frequency operation start temperature stored in the storage unit 5b, the determination in step S103 becomes "Yes". The determination unit 5f instructs the acquisition unit 5a to perform the drive frequency control operation of the compressor and the blower, and proceeds to step S104.

一方、ステップＳ１０２で取得された温度が、記憶部５ｂに格納されている周波数運転開始温度よりも低くないと判定されると、ステップＳ１０３での判断は“Ｎｏ”となり、ステップＳ１０１に戻り、再度、現在の庫内ないし室内温度の取得が行われる。 On the other hand, if it is determined that the temperature acquired in step S102 is not lower than the frequency operation start temperature stored in the storage unit 5b, the determination in step S103 becomes "No", the process returns to step S101, and the process is performed again. , The current temperature inside or inside the refrigerator is acquired.

つづいて、ステップＳ１０４で、前記圧縮機および送風機の駆動周波数制御動作が行われる。
この制御動作については、前記した通りである。 Subsequently, in step S104, the drive frequency control operation of the compressor and the blower is performed.
This control operation is as described above.

さらに、ステップＳ１０５に進み、取得部５ａは、温度検出手段９から現在の温度（前記制御動作後の庫内ないし室内温度）を取得し、取得した温度データを判定部５ｆに送る。
なお、この温度の取得については、前記制御動作が開始されてから所定の時間が経過した後に行われるようにしてもよい。 Further, the process proceeds to step S105, and the acquisition unit 5a acquires the current temperature (inside or indoor temperature after the control operation) from the temperature detecting means 9, and sends the acquired temperature data to the determination unit 5f.
It should be noted that the acquisition of this temperature may be performed after a predetermined time has elapsed from the start of the control operation.

ステップＳ１０６で、判定部５ｆは、ステップＳ１０５で取得された温度が、記憶部５ｂ内に格納されている停止温度よりも低いか否かを判定する。
その際、ステップＳ１０５で取得された温度が停止温度よりも低いか否かは、例えば、所定の誤差範囲に収まっている旨の条件を充足するか否かに基づいて判定してもよい。 In step S106, the determination unit 5f determines whether or not the temperature acquired in step S105 is lower than the stop temperature stored in the storage unit 5b.
At that time, whether or not the temperature acquired in step S105 is lower than the stop temperature may be determined based on, for example, whether or not the condition that the temperature is within a predetermined error range is satisfied.

ステップＳ１０６において、判定部５ｆによって、ステップＳ１０５で取得された温度が、記憶部５ｂ内に格納されている停止温度よりも低いと判定されると、ステップＳ１０６での判断は“Ｙｅｓ”となり、処理を終了する。 In step S106, when the determination unit 5f determines that the temperature acquired in step S105 is lower than the stop temperature stored in the storage unit 5b, the determination in step S106 becomes "Yes" and the process is performed. To finish.

一方、ステップＳ１０５で取得された温度が、記憶部５ｂ内に格納されている停止温度よりも低くないと判定されると、ステップＳ１０６での判断は“Ｎｏ”となり、ステップＳ１０２に戻り、再度、現在の庫内ないし室内温度の取得が行われ、しかるのち、ステップＳ１０４で前記圧縮機および送風機の駆動周波数制御動作が行われる。 On the other hand, if it is determined that the temperature acquired in step S105 is not lower than the stop temperature stored in the storage unit 5b, the determination in step S106 becomes "No", the process returns to step S102, and again. The current temperature inside or inside the refrigerator is acquired, and then, in step S104, the drive frequency control operation of the compressor and the blower is performed.

この発明にかかる冷却装置は、冷凍サイクル（冷媒回路）を使用した機器であれば特に限定されず、例えば、冷凍庫や、冷蔵庫、ショーケースなどに適用することができるもので、庫内ないし室内の冷却用の冷却装置として好適なものである。 The cooling device according to the present invention is not particularly limited as long as it is a device using a refrigerating cycle (refrigerant circuit), and can be applied to, for example, a freezer, a refrigerator, a showcase, etc. It is suitable as a cooling device for cooling.

この発明にかかる冷却装置の制御方法は、圧縮機、凝縮器、蒸発器およびこれらを接続する冷媒配管を備え、前記蒸発器に空気を取り込むための送風機、制御装置および圧力検出手段を備える冷却装置の制御を行うためもので、
前記圧力検出手段によって冷媒の凝縮圧力及び蒸発圧力を検出し、検出された凝縮圧力及び蒸発圧力並びに前記圧縮機の駆動周波数の現在の設定値に対応する前記冷却装置の冷却能力の値と前記圧縮機の消費電力の値を基準値として得る工程と、
前記送風機の駆動周波数の現在の設定値に対応する前記送風機の消費電力の値を基準値として得る工程と、
前記冷却装置の冷却能力の値と前記圧縮機の基準消費電力値と前記送風機の基準消費電力値から、所定の演算式を用いて、基準ＣＯＰ値を算出する工程と、
前記基準ＣＯＰ値の算出後に、前記圧縮機及び前記送風機の各駆動周波数を、前記設定値よりも所定の割合増減させて、新たな設定値に変更、再設定する工程と、
再度、前記圧力検出手段によって冷媒の蒸発圧力及び凝縮圧力を検出し、検出された凝縮圧力及び蒸発圧力並びに前記圧縮機の前記再設定された駆動周波数の値に対応する前記冷却装置の冷却能力の値と前記圧縮機の再設定消費電力の値を得る工程と、
前記送風機の前記再設定された駆動周波数の値に対応する前記送風機の再設定消費電力の値を得る工程と、
前記冷却装置の冷却能力の値と前記圧縮機の再設定消費電力値と前記送風機の再設定消費電力値から、前記所定の演算式を用いて、算出ＣＯＰ値を算出する工程と、
前記基準ＣＯＰ値と前記算出ＣＯＰ値を比較して、前記算出ＣＯＰ値が、より適当なＣＯＰ値であるか否かを判定する工程と、
前記適当なＣＯＰ値に対応する駆動周波数で、前記圧縮機と前記送風機を制御する工程と、
を含むこと
を特徴とするものである。 The cooling device control method according to the present invention includes a compressor, a condenser, an evaporator, and a refrigerant pipe connecting them, and includes a blower for taking air into the evaporator, a control device, and a cooling device having pressure detecting means. To control
The pressure detecting means detects the condensation pressure and evaporation pressure of the refrigerant, and the value of the cooling capacity of the cooling device corresponding to the detected condensation pressure and evaporation pressure and the current set value of the drive frequency of the compressor and the compression. The process of obtaining the value of the power consumption of the machine as a reference value, and
A process of obtaining the value of the power consumption of the blower corresponding to the current set value of the drive frequency of the blower as a reference value, and
A step of calculating a reference COP value from the value of the cooling capacity of the cooling device, the reference power consumption value of the compressor, and the reference power consumption value of the blower by using a predetermined calculation formula.
After calculating the reference COP value, the drive frequencies of the compressor and the blower are increased / decreased by a predetermined ratio from the set value, and changed to a new set value and reset.
Again, the pressure detecting means detects the evaporation pressure and the condensation pressure of the refrigerant, and the cooling capacity of the cooling device corresponding to the detected condensation pressure and the evaporation pressure and the reset drive frequency value of the compressor. The process of obtaining the value and the reset power consumption value of the compressor, and
The step of obtaining the reset power consumption value of the blower corresponding to the reset drive frequency value of the blower, and the process of obtaining the reset power consumption value of the blower.
A step of calculating a calculated COP value from the value of the cooling capacity of the cooling device, the reset power consumption value of the compressor, and the reset power consumption value of the blower by using the predetermined calculation formula.
A step of comparing the reference COP value with the calculated COP value to determine whether or not the calculated COP value is a more appropriate COP value.
A step of controlling the compressor and the blower at a drive frequency corresponding to the appropriate COP value, and
It is characterized by including.

かかる制御方法は、所定の制御装置を利用して行うことができ、前記冷却装置についての記載を参考にして容易に実施することができる。 Such a control method can be performed by using a predetermined control device, and can be easily carried out with reference to the description of the cooling device.

つぎに、この発明にかかる制御プログラムについて説明する。
前述した動作に基づく処理を、コンピュータなどの制御装置が実行するためのプログラムは、この発明のプログラムを構成する。 Next, the control program according to the present invention will be described.
A program for a control device such as a computer to execute a process based on the above-mentioned operation constitutes the program of the present invention.

このプログラムについては、前記記憶部５ｂに記憶させて実行することができ、あるいは、所定の記録媒体に記録したものを介して実行することもできる。
このプログラムを記録するための記憶媒体としては、光ディスク、半導体メモリ、磁気記録媒体などを用いることができ、これらをＲＯＭ、ＲＡＭ、メモリカードなどに構成して用いてもよい。
This program can be stored in the storage unit 5b and executed, or can be executed via a program recorded on a predetermined recording medium.
As a storage medium for recording this program, an optical disk, a semiconductor memory, a magnetic recording medium, or the like can be used, and these may be configured in a ROM, RAM, a memory card, or the like.

この発明にかかる冷却装置とその制御方法および制御プログラムにおいては、冷却の実施状況に応じて、常時、適当なＣＯＰを算出し、このＣＯＰ値に基づいて圧縮機と蒸発器が備える送風機の各駆動周波数が制御される。
したがって、前記冷却装置とその制御方法および制御プログラムは、冷却ないし冷凍に際して、正確かつ安定した運転状態を維持しつつ、省エネルギー性を向上させることができるので、食品業界などの、冷凍サイクル（冷媒回路）を使用した機器を使用する業界において広く利用される可能性の高いものである。
In the cooling device, its control method, and the control program according to the present invention, an appropriate COP is constantly calculated according to the cooling implementation status, and each drive of the blower provided in the compressor and the evaporator is based on this COP value. The frequency is controlled.
Therefore, the cooling device and its control method and control program can improve energy saving while maintaining an accurate and stable operating state during cooling or freezing, and thus a refrigerating cycle (refrigerant circuit) such as in the food industry. ) Is likely to be widely used in the industry that uses the equipment.

１冷却装置
２圧縮機
３凝縮器
４蒸発器
４ａ送風機（ファン）
５制御装置
５ａ取得部
５ｂ記憶部
５ｃ設定部
５ｄ選択部
５ｅ演算部
５ｆ判定部
５ｇ制御部
６圧力（凝縮圧力）検出手段
７圧力（蒸発圧力）検出手段
８膨張弁
９温度検出手段
Ｘ冷媒が流れる方向 1 Cooling device 2 Compressor 3 Condensator 4 Evaporator 4a Blower (fan)
5 Control device 5a Acquisition unit 5b Storage unit 5c Setting unit 5d Selection unit 5e Calculation unit 5f Judgment unit 5g Control unit 6 Pressure (condensation pressure) detection means 7 Pressure (evaporation pressure) detection means 8 Expansion valve 9 Temperature detection means X Refrigerant Direction of flow

Claims

A cooling device including a compressor, a condenser, an evaporator, and a refrigerant pipe connecting them, and equipped with a control device and a pressure detecting means.
The evaporator is
Equipped with a blower to take in air,
The control device is
Data showing the relationship between the condensation pressure and evaporation pressure of the refrigerant, the drive frequency of the compressor, the power consumption of the compressor, and the cooling capacity of the cooling device, and the data showing the relationship between the drive frequency of the blower and the power consumption. And the storage part that remembers
A setting unit that changes and resets each drive frequency of the compressor and blower to a new set value by increasing or decreasing it by a predetermined ratio from the current set value.
The values of the condensing pressure and the evaporating pressure detected by the pressure detecting means, the value of the cooling capacity of the cooling device corresponding to the set value of the driving frequency of the compressor, the value of the reference power consumption of the compressor, and the pressure. The values of the condensing pressure and the evaporating pressure re -detected by the detecting means, the value of the cooling capacity of the cooling device corresponding to the reset value of the drive frequency of the compressor, and the value of the reset power consumption of the compressor, said. Each of the reference power consumption value of the blower corresponding to the set value of the drive frequency of the blower and the reset power consumption value of the blower corresponding to the reset value of the drive frequency of the blower are stored in the storage unit. A selection section that refers to and selects data, and
The value of the cooling capacity of the cooling device corresponding to the value of the condensing pressure and the evaporating pressure detected by the pressure detecting means selected by the selection unit and the setting value of the driving frequency of the compressor and the reference of the compressor. The reference COP is calculated from the value of the power consumption and the value of the reference power consumption of the blower by using a predetermined calculation formula, and the condensing pressure and the evaporation pressure again detected by the pressure detecting means selected by the selection unit. And the value of the cooling capacity of the cooling device corresponding to the reset value of the drive frequency of the compressor, the value of the reset power consumption of the compressor, and the value of the reset power consumption of the blower. The calculation unit that calculates the calculated COP using the calculation formula of
A determination unit that compares the reference COP value with the calculated COP value and determines whether or not the calculated COP value is a more appropriate COP value.
A cooling device including a control unit that controls the compressor and the blower so as to be driven at a drive frequency corresponding to a COP value determined to be more appropriate by the determination unit.

The pressure detecting means is
It is characterized by being composed of a pressure detecting means for detecting the condensation pressure arranged on the outlet side of the condenser and a pressure detecting means for detecting the evaporation pressure arranged on the suction side of the compressor. The cooling device according to claim 1.

The calculation formula is
_Let Q be the cooling capacity of the cooling device, Ed be the power consumption of the compressor, and E _f be the power consumption of the blower.
COP = Q / (E _d + E _f )
The cooling device according to claim 1 or 2, wherein the cooling device is represented by.

The calculation formula is
_Let Q be the cooling capacity of the cooling device, Ed be the power consumption of the compressor, and E _f be the power consumption of the blower.
COP = (Q-E _f ) / (E _d + E _f )
The cooling device according to claim 1 or 2, wherein the cooling device is represented by.

A control method for a cooling device including a compressor, a condenser, an evaporator, and a refrigerant pipe connecting them, and a blower for taking air into the evaporator, a control device, and a pressure detecting means.
The pressure detecting means detects the condensation pressure and evaporation pressure of the refrigerant, and the value of the cooling capacity of the cooling device corresponding to the detected condensation pressure and evaporation pressure and the current set value of the drive frequency of the compressor and the compression. The process of obtaining the value of the power consumption of the machine as a reference value, and
A process of obtaining the value of the power consumption of the blower corresponding to the current set value of the drive frequency of the blower as a reference value, and
A step of calculating a reference COP value from the value of the cooling capacity of the cooling device, the reference power consumption value of the compressor, and the reference power consumption value of the blower by using a predetermined calculation formula.
After calculating the reference COP value, the drive frequencies of the compressor and the blower are increased / decreased by a predetermined ratio from the set value, and changed to a new set value and reset.
Again, the pressure detecting means detects the evaporation pressure and the condensation pressure of the refrigerant, and the cooling capacity of the cooling device corresponding to the detected condensation pressure and the evaporation pressure and the reset drive frequency value of the compressor. The process of obtaining the value and the reset power consumption value of the compressor, and
The step of obtaining the reset power consumption value of the blower corresponding to the reset drive frequency value of the blower, and the process of obtaining the reset power consumption value of the blower.
A step of calculating a calculated COP value from the value of the cooling capacity of the cooling device, the reset power consumption value of the compressor, and the reset power consumption value of the blower by using the predetermined calculation formula.
A step of comparing the reference COP value with the calculated COP value to determine whether or not the calculated COP value is a more appropriate COP value.
A step of controlling the compressor and the blower at a drive frequency corresponding to the appropriate COP value, and
A method of controlling a cooling device, which comprises.

The cooling device is
Further equipped with temperature detection means,
The control method is
The control method for a cooling device according to claim 5, wherein the cooling device is performed when the temperature inside the refrigerator or the room detected by the temperature detecting means becomes lower than the frequency operation start temperature.

A control program for a cooling device including a compressor, a condenser, an evaporator, and a refrigerant pipe connecting them, and a blower, a control device, and a pressure detecting means for taking air into the evaporator.
On the computer
Data showing the relationship between the condensation pressure and evaporation pressure of the refrigerant, the drive frequency of the compressor, the power consumption of the compressor, and the cooling capacity of the cooling device, and the data showing the relationship between the drive frequency of the blower and the power consumption. And a saving step for saving a database storing a predetermined calculation formula for calculating COP from the value of the cooling capacity of the cooling device, the value of the power consumption of the compressor, and the value of the power consumption of the blower.
A pressure acquisition step for acquiring the condensation pressure and evaporation pressure of the refrigerant detected from the pressure detecting means, and
A frequency acquisition step of acquiring the current set value of each drive frequency of the compressor and the blower as a reference value, and
From the database, data showing the relationship between the condensation pressure and evaporation pressure of the refrigerant, the drive frequency of the compressor, the power consumption of the compressor, and the cooling capacity of the cooling device, and the relationship between the drive frequency and the power consumption of the blower. The data read step to read the data representing
The value of the cooling capacity of the cooling device corresponding to the set value of the condensation pressure and evaporation pressure of the refrigerant acquired in the pressure acquisition step and the drive frequency of the compressor acquired in the frequency acquisition step, and the reference power consumption of the compressor. The value of is selected with reference to the data stored in the database, and the value of the reference power consumption of the blower corresponding to the set value of the drive frequency of the blower acquired in the frequency acquisition step is selected in the database. A selection step to browse and select the data stored in
An arithmetic expression reading step for reading the arithmetic expression from the database, and
Using the value of the cooling capacity of the cooling device selected in the selection step, the value of the reference power consumption of the compressor, and the value of the reference power consumption of the blower, the calculation formula read in the calculation formula reading step is used. The standard COP calculation step to calculate the standard COP based on
The frequency setting step of changing and resetting each drive frequency of the compressor and the blower to a new set value by increasing / decreasing by a predetermined ratio from the set value, and
A pressure reacquisition step of acquiring the condensation pressure and evaporation pressure of the refrigerant detected again from the pressure detecting means, and
From the database again, data showing the relationship between the condensation pressure and evaporation pressure of the refrigerant, the drive frequency of the compressor, the power consumption of the compressor, and the cooling capacity of the cooling device, and the drive frequency and power consumption of the blower. The data re-reading step to read the data representing the relationship between
The cooling capacity value of the cooling device and the compressor re-acquisition corresponding to the condensation pressure and evaporation pressure of the refrigerant acquired in the pressure reacquisition step and the drive frequency value of the compressor reset in the frequency setting step. The value of the set power consumption is selected with reference to the data stored in the database, and the reset power consumption of the blower corresponding to the value of the drive frequency of the reset blower in the frequency setting step is selected. A reselection step to select a value by referring to the data stored in the database, and
The operation formula re-reading step of re-reading the calculation formula from the database, and the operation formula re-reading step.
The value of the cooling capacity of the cooling device selected in the reselection step, the value of the reset power consumption of the compressor, and the value of the reset power consumption of the blower are used and read out in the arithmetic reread step. The calculated COP calculation step to calculate the calculated COP based on the calculated formula,
A determination step of comparing the reference COP value and the calculated COP value to determine whether or not the calculated COP value is a more appropriate COP value.
In the determination step, the control step for controlling the compressor and the blower at the drive frequency corresponding to the COP determined to be more appropriate, and the control step.
A cooling device control program characterized by running.