JP2005282896A - Refrigerating machine - Google Patents

Refrigerating machine Download PDF

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Publication number
JP2005282896A
JP2005282896A JP2004094907A JP2004094907A JP2005282896A JP 2005282896 A JP2005282896 A JP 2005282896A JP 2004094907 A JP2004094907 A JP 2004094907A JP 2004094907 A JP2004094907 A JP 2004094907A JP 2005282896 A JP2005282896 A JP 2005282896A
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Prior art keywords
compressor
compressors
control device
refrigerator
priority
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Yoshio Miyamoto
善至雄 宮本
Tsutomu Yamaguchi
勤 山口
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Sanyo Electric Co Ltd
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Sanyo Electric Co Ltd
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Priority to JP2004094907A priority Critical patent/JP2005282896A/en
Priority to CNB2005100056328A priority patent/CN100381771C/en
Publication of JP2005282896A publication Critical patent/JP2005282896A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/07—Details of compressors or related parts
    • F25B2400/075—Details of compressors or related parts with parallel compressors

Abstract

<P>PROBLEM TO BE SOLVED: To equalize operation times of compressors in a refrigeration machine having the plurality of compressors arranged in parallel with each other. <P>SOLUTION: This refrigerating machine 1 comprises the plurality of compressors 2A-2C arranged in parallel with each other, and a controller 8 for controlling the operation of each of the compressors 2A-2C. The controller 8 has an automatic switching mode for determining the number of compressors 2A-2C to be operated in accordance with load, operating each of the compressors 2A-2C on the basis of specific priority, and changing the priority of the compressor of longest operation time and the compressor of shortest operation by a specific period. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、例えば低温ショーケースや冷蔵庫、冷凍庫などの庫内を冷却するための冷凍機に関するものである。   The present invention relates to a refrigerator for cooling the interior of a refrigerator such as a low temperature showcase, a refrigerator, or a freezer.

従来より此の種低温ショーケースなどには蒸発器が設置され、この蒸発器に圧縮機にて圧縮され、凝縮器にて放熱して凝縮した冷媒を減圧装置にて減圧して供給し、蒸発させて庫内冷却を行う構成とされている。この場合、圧縮機や凝縮器は一体として冷凍機を構成し、店舗内に設置される低温ショーケースとは別置きにされる。また、特に低温ショーケースの台数が多い場合には、圧縮機が複数台（例えば、２台〜５台）並列接続された状態で設置され、大負荷（低温ショーケース側の冷凍負荷）に対応できる構成とされていた（例えば、特許文献１参照）。
特許第３３０１７６７号 Conventionally, an evaporator is installed in this kind of low-temperature showcase, etc., and the refrigerant is compressed by the compressor, radiated by the condenser and condensed by reducing the pressure by the decompression device, and evaporating. The inside cooling is performed. In this case, the compressor and the condenser constitute a refrigerator as a unit, and are separated from the low-temperature showcase installed in the store. Also, especially when the number of low-temperature showcases is large, multiple compressors (for example, 2 to 5) are installed in parallel and can handle large loads (refrigeration loads on the low-temperature showcase side). It was set as the structure which can be performed (for example, refer patent document 1).
Patent No. 3130767

ところで、通常圧縮機は負荷に応じてその運転台数が決定され、負荷が小さい場合には例えば１台、それから負荷が上昇するに従って２台、３台と運転台数を増やしていく制御が成される。この場合、従来では圧縮機を運転する優先順位（どの圧縮機を最初に運転し、それに追加して次にどの圧縮機を運転するか）が予め決定されており、そのため、優先順位の高い、即ち、最初に運転される圧縮機の運転時間が優先順位の低い圧縮機に比較して異常に長くなり、故障が多くなると共に早期に寿命に至る問題があった。   By the way, the number of operating units of the normal compressor is determined according to the load, and when the load is small, for example, one unit is controlled, and then the number of units to be operated is increased to two units and three units as the load increases. . In this case, conventionally, the order of priority for operating the compressor (which compressor is operated first and which compressor is operated next) is determined in advance, so that the priority is high. That is, there is a problem that the operation time of the compressor that is operated first becomes abnormally long as compared with the compressor with a low priority, the number of failures increases, and the life is shortened early.

本発明は、係る従来の技術的課題を解決するために成されたものであり、複数台並列接続された圧縮機を有する冷凍機において、各圧縮機の運転時間を平準化を図ることを目的とする。   The present invention has been made to solve the conventional technical problems, and aims to level the operating time of each compressor in a refrigerator having a plurality of compressors connected in parallel. And

本発明の冷凍機は、並列接続された複数台の圧縮機を備えたものであって、各圧縮機の運転を制御する制御装置を備え、この制御装置は、負荷に応じて圧縮機の運転台数を決定し、所定の優先順位に基づいて各圧縮機を運転すると共に、所定期間毎に最も運転時間の長い圧縮機と最も運転時間の短い圧縮機の優先順位を切り換える自動切換モードを有することを特徴とする。   The refrigerator according to the present invention includes a plurality of compressors connected in parallel, and includes a control device that controls the operation of each compressor. The control device operates the compressor according to a load. It has an automatic switching mode that determines the number of units and operates each compressor based on a predetermined priority, and switches the priority between the compressor with the longest operating time and the compressor with the shortest operating time every predetermined period. It is characterized by.

請求項２の発明の冷凍機は、上記において制御装置は、任意に前記優先順位の正逆を切り換える手動モードを有することを特徴とする。   The refrigerator according to the invention of claim 2 is characterized in that, in the above, the control device has a manual mode for arbitrarily switching the order of priority.

請求項３の発明の冷凍機は、上記各発明において制御装置は表示手段を備え、自動切換モードにおける次回切換までの期間に関する情報を表示手段にて表示することを特徴とする。   The refrigerator of the invention of claim 3 is characterized in that, in each of the above inventions, the control device comprises a display means, and the display means displays information relating to a period until the next switching in the automatic switching mode.

請求項４の発明の冷凍機は、上記において制御装置は、現在の前記優先順位に関する情報を表示手段にて表示することを特徴とする。   The refrigerator of the invention of claim 4 is characterized in that, in the above, the control device displays information on the current priority order on a display means.

請求項５の発明の冷凍機は、上記各発明において各圧縮機は同一容量であることを特徴とする。   The refrigerator of the invention of claim 5 is characterized in that in each of the above inventions, each compressor has the same capacity.

本発明では、並列接続された複数台の圧縮機を備えた冷凍機において、各圧縮機の運転を制御する制御装置を備え、この制御装置は、負荷に応じて圧縮機の運転台数を決定し、所定の優先順位に基づいて各圧縮機を運転すると共に、所定期間毎に最も運転時間の長い圧縮機と最も運転時間の短い圧縮機の優先順位を切り換える自動切換モードを有するので、自動的に各圧縮機の運転時間を平準化することができるようになる。これにより、特定の圧縮機が故障に至り、或いは、寿命が短くなる不都合を回避することが可能となる。   In the present invention, a refrigerator including a plurality of compressors connected in parallel is provided with a control device that controls the operation of each compressor, and this control device determines the number of compressors to be operated according to the load. Since each compressor is operated based on a predetermined priority order, and has an automatic switching mode for switching the priority order of the compressor having the longest operating time and the compressor having the shortest operating time every predetermined period, The operating time of each compressor can be leveled. As a result, it is possible to avoid the disadvantage that a specific compressor is broken or whose life is shortened.

請求項２の発明では上記に加えて制御装置は、任意に前記優先順位の正逆を切り換える手動モードを有するので、状況に応じて圧縮機を運転する優先順位の正逆を手動で切り換えることができるようになり、利便性が増す。   In the invention of claim 2, in addition to the above, the control device has a manual mode for arbitrarily switching the priority order, so that the priority order for operating the compressor can be switched manually according to the situation. It becomes possible, and convenience increases.

請求項３の発明では上記各発明に加えて制御装置は表示手段を備え、自動切換モードにおける次回切換までの期間に関する情報を表示手段にて表示するので、使用者は圧縮機の運転優先順位がどのくらいの期間で自動切換されるかを容易に確認することができるようになる。   In the invention of claim 3, in addition to the above-mentioned inventions, the control device is provided with a display means, and the information about the period until the next switching in the automatic switching mode is displayed on the display means. It becomes possible to easily check how long the automatic switching is performed.

請求項４の発明では上記に加えて制御装置は、現在の前記優先順位に関する情報を表示手段にて表示するので、使用者は現在の圧縮機の運転優先順位を容易に確認することができるようになる。   In the invention of claim 4, in addition to the above, the control device displays information on the current priority order on the display means, so that the user can easily confirm the current operation priority order of the compressor. become.

特に、請求項５の如く各圧縮機が同一容量である場合、各圧縮機の運転時間の平準化に本発明は多大な効果を奏するものである。   In particular, when each compressor has the same capacity as in claim 5, the present invention has a great effect on leveling the operation time of each compressor.

以下、図面に基づき本発明の実施形態を詳述する。図１は本発明を適用した実施例の冷凍機１の冷媒回路図である。実施例の冷凍機１は図示しない低温ショーケースの庫内冷却に用いられるものであり、同一容量の３台の圧縮機２Ａ、２Ｂ、２Ｃと、凝縮器（放熱器）３とを備えて構成されている。各圧縮機２Ａ〜２Ｃは相互に並列接続されており、各圧縮機２Ａ〜２Ｃの冷媒吐出側に前記凝縮器３が接続されている。そして、冷凍機１の凝縮器３の冷媒出口側に図示しない低温ショーケースの膨張弁（減圧装置）４が接続され、膨張弁４の出口側に低温ショーケースの蒸発器６が接続される。そして、この蒸発器６の出口側が冷凍機１の各圧縮機２Ａ〜２Ｃの冷媒吸込側に接続されて冷媒回路を構成される。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a refrigerant circuit diagram of a refrigerator 1 according to an embodiment to which the present invention is applied. The refrigerator 1 of the embodiment is used for cooling the inside of a low-temperature showcase (not shown), and includes three compressors 2A, 2B, 2C having the same capacity, and a condenser (heat radiator) 3. Has been. Each compressor 2A-2C is mutually connected in parallel, and the said condenser 3 is connected to the refrigerant | coolant discharge side of each compressor 2A-2C. An unillustrated low-temperature showcase expansion valve (decompression device) 4 is connected to the refrigerant outlet side of the condenser 3 of the refrigerator 1, and a low-temperature showcase evaporator 6 is connected to the outlet side of the expansion valve 4. And the exit side of this evaporator 6 is connected to the refrigerant | coolant suction side of each compressor 2A-2C of the refrigerator 1, and a refrigerant circuit is comprised.

また、冷凍機１には各圧縮機２Ａ〜２Ｃの運転を制御するための制御装置８が設けられている。この制御装置８は前記冷媒回路の低圧側の圧力を検出する圧力センサ９の出力に基づいて低温ショーケースの負荷を判断し、圧縮機２Ａ〜２Ｃの運転台数を決定すると共に、所定の優先順位で各圧縮機２Ａ〜２Ｃを運転する。また、制御装置８には操作スイッチ（操作手段）１１と表示器（表示手段）１２が接続されている。   In addition, the refrigerator 1 is provided with a control device 8 for controlling the operation of the compressors 2A to 2C. The control device 8 determines the load of the low temperature showcase based on the output of the pressure sensor 9 that detects the pressure on the low pressure side of the refrigerant circuit, determines the number of compressors 2A to 2C to be operated, and has a predetermined priority order. Then, the compressors 2A to 2C are operated. An operation switch (operation means) 11 and a display (display means) 12 are connected to the control device 8.

以上の構成で次に動作を説明する。前記操作スイッチ１１にはモード切換スイッチが設けられており、このモード切換スイッチにより制御装置８は自動切換モードと、手動モード（正モード、逆モード）とに切り換えられる。そして、ここでは圧縮機２Ａ−圧縮機２Ｂ−圧縮機２Ｃの優先順位を正順位、圧縮機２Ｃ−圧縮機２Ｂ−圧縮機２Ａの優先順位を逆順位とする。   Next, the operation of the above configuration will be described. The operation switch 11 is provided with a mode change switch, and the control device 8 is switched between an automatic change mode and a manual mode (forward mode, reverse mode) by this mode change switch. In this example, the priority order of the compressor 2A-compressor 2B-compressor 2C is the normal order, and the priority order of the compressor 2C-compressor 2B-compressor 2A is the reverse order.

（１）手動モード（正順位）
先ず、上記手動モードについて説明する。操作スイッチ１１のモード切換スイッチの操作により、制御装置８が正モードに設定されると、制御装置８は圧縮機２Ａ〜２Ｃを運転する優先順位を前記正順位とする。この正順位では、制御装置８は先ず最も優先順位の高い圧縮機２Ａを起動して運転し、冷媒回路に冷媒を循環させる。圧縮機２Ａにて圧縮された冷媒は冷媒吐出側から吐出されて凝縮器３に流入し、凝縮器３にて放熱して凝縮する。この凝縮器３にて凝縮した冷媒は膨張弁４にて絞られ、蒸発器６に流入してそこで蒸発する。このときに周囲から蒸発潜熱を奪って冷却作用を発揮し、圧縮機２Ａの冷媒吸込側に吸い込まれる循環をする。 (1) Manual mode (normal order)
First, the manual mode will be described. When the control device 8 is set to the positive mode by operating the mode switch of the operation switch 11, the control device 8 sets the priority order for operating the compressors 2A to 2C as the positive order. In this normal order, the control device 8 first starts and operates the compressor 2A having the highest priority, and circulates the refrigerant in the refrigerant circuit. The refrigerant compressed by the compressor 2A is discharged from the refrigerant discharge side, flows into the condenser 3, and dissipates heat in the condenser 3 to condense. The refrigerant condensed in the condenser 3 is throttled by the expansion valve 4, flows into the evaporator 6 and evaporates there. At this time, latent heat of vaporization is taken away from the surroundings to exhibit a cooling action, and the refrigerant is circulated by being sucked into the refrigerant suction side of the compressor 2A.

上記凝縮器３には図示しない送風機によって外気が通風されており、これによって、圧縮機２Ａから吐出された高温高圧のガス冷媒を空冷する。また、蒸発器６には庫内冷却用の図示しない送風機によって庫内空気が循環され、これによって図示しない低温ショーケースの庫内に蒸発器６と熱交換した冷気が循環されて冷却される。   Outside air is ventilated to the condenser 3 by a blower (not shown), thereby air-cooling the high-temperature and high-pressure gas refrigerant discharged from the compressor 2A. In the evaporator 6, the air in the cabinet is circulated by a blower (not shown) for cooling the inside of the evaporator 6, whereby the cool air exchanged with the evaporator 6 is circulated and cooled in the warehouse of a low-temperature showcase (not shown).

一方、制御装置８は前記圧力センサ９が検出する冷媒回路の低圧側圧力と設定値とを比較しており、低圧側圧力が上昇して設定値との偏差が拡大すると、低温ショーケース側の冷凍負荷が増大したものと判断して運転する圧縮機の台数を１台増やす。この場合、優先順位が正順位であるので、既に運転している圧縮機２Ａに加えて次に優先順位の高い圧縮機２Ｂも起動し、運転を開始する（合計運転台数２台）。これにより、冷媒回路を流れる冷媒の循環量が増大し、冷却能力が上がる。そして、低温ショーケース側の冷凍負荷が更に増大して上記偏差が拡大すると、制御装置８は更に圧縮機の運転台数を１台増やす。即ち、この場合も優先順位は正順位であるので、既に運転している圧縮機２Ａ、２Ｂに加えて最も優先順位の低い圧縮機２Ｃを起動し、運転を開始する（合計運転台数３台）。これにより、冷媒循環量は更に増大して冷却能力が向上する。   On the other hand, the control device 8 compares the low pressure side pressure of the refrigerant circuit detected by the pressure sensor 9 with the set value, and when the low pressure side pressure rises and the deviation from the set value increases, Increase the number of compressors to be operated by judging that the refrigeration load has increased. In this case, since the priority order is the normal order, the compressor 2B having the next highest priority is started in addition to the compressor 2A that has already been operated, and the operation is started (total number of operating units 2). Thereby, the circulation amount of the refrigerant | coolant which flows through a refrigerant circuit increases, and cooling capacity goes up. When the refrigeration load on the low-temperature showcase side further increases and the deviation increases, the control device 8 further increases the number of operating compressors by one. That is, in this case as well, since the priority is a positive order, the compressor 2C having the lowest priority is started in addition to the compressors 2A and 2B that are already operating, and the operation is started (total number of operating units 3). . Thereby, the refrigerant circulation amount is further increased and the cooling capacity is improved.

このようにして低温ショーケース側の冷凍負荷が増大するに応じて圧縮機２Ａ−２Ｂ−２Ｃの順で運転台数を増やしていき、庫内の冷却能力を確保する。尚、冷凍負荷が減少して前記偏差が縮小していくに従い、制御装置８は上記とは逆の順番で先ず圧縮機２Ｃを停止し、更に偏差が縮小すれば圧縮機２Ｂも停止する。そして、低圧側圧力が設定値より低下することで圧縮機２Ａも停止して全停止とする。   In this way, as the refrigeration load on the low temperature showcase side increases, the number of operating units is increased in the order of the compressors 2A-2B-2C, and the cooling capacity in the refrigerator is ensured. As the refrigeration load decreases and the deviation decreases, the control device 8 first stops the compressor 2C in the reverse order to the above, and further stops the compressor 2B if the deviation further decreases. Then, when the low-pressure side pressure is lower than the set value, the compressor 2A is also stopped and fully stopped.

（２）手動モード（逆順位）
次に、操作スイッチ１１のモード切換スイッチの操作により、制御装置８が逆モードに設定されると、制御装置８は圧縮機２Ａ〜２Ｃを運転する優先順位を前記逆順位とする。この逆順位では、制御装置８は先ずこの場合に最も優先順位の高い圧縮機２Ｃを起動して運転し、冷媒回路に冷媒を循環させる。圧縮機２Ｃにて圧縮された冷媒は冷媒吐出側から吐出されて凝縮器３に流入し、凝縮器３にて放熱して凝縮する。この凝縮器３にて凝縮した冷媒は膨張弁４にて絞られ、蒸発器６に流入してそこで蒸発する。このときに周囲から蒸発潜熱を奪って冷却作用を発揮し、圧縮機２Ａの冷媒吸込側に吸い込まれる循環をする。低温ショーケースの庫内冷却は前述と同様である。 (2) Manual mode (reverse order)
Next, when the control device 8 is set to the reverse mode by operating the mode switch of the operation switch 11, the control device 8 sets the priority order for operating the compressors 2A to 2C as the reverse order. In this reverse order, the control device 8 first starts and operates the compressor 2C having the highest priority in this case, and circulates the refrigerant in the refrigerant circuit. The refrigerant compressed by the compressor 2C is discharged from the refrigerant discharge side, flows into the condenser 3, and dissipates heat in the condenser 3 to condense. The refrigerant condensed in the condenser 3 is throttled by the expansion valve 4, flows into the evaporator 6 and evaporates there. At this time, latent heat of vaporization is taken from the surroundings to exert a cooling action, and the refrigerant is circulated by being sucked into the refrigerant suction side of the compressor 2A. The interior cooling of the low temperature showcase is the same as described above.

また、制御装置８は前記圧力センサ９が検出する冷媒回路の低圧側圧力と設定値とを比較しており、低圧側圧力が上昇して設定値との偏差が拡大すると、低温ショーケース側の冷凍負荷が増大したものと判断して運転する圧縮機の台数を１台増やす。この場合、優先順位が逆順位であるので、既に運転している圧縮機２Ｃに加えて次に優先順位の高い圧縮機２Ｂも起動し、運転を開始する（合計運転台数２台）。これにより、冷媒回路を流れる冷媒の循環量が増大し、冷却能力が上がる。そして、低温ショーケース側の冷凍負荷が更に増大して上記偏差が拡大すると、制御装置８は更に圧縮機の運転台数を１台増やす。即ち、この場合も優先順位は逆順位であるので、既に運転している圧縮機２Ｃ、２Ｂに加えて最も優先順位の低い圧縮機２Ａを起動し、運転を開始する（合計運転台数３台）。これにより、冷媒循環量は更に増大して冷却能力が向上する。   Further, the control device 8 compares the low pressure side pressure of the refrigerant circuit detected by the pressure sensor 9 with the set value, and when the low pressure side pressure rises and the deviation from the set value increases, Increase the number of compressors to be operated by judging that the refrigeration load has increased. In this case, since the priority order is the reverse order, the compressor 2B having the next highest priority is started in addition to the compressor 2C that is already operating, and the operation is started (total number of operating units 2). Thereby, the circulation amount of the refrigerant | coolant which flows through a refrigerant circuit increases, and cooling capacity goes up. When the refrigeration load on the low-temperature showcase side further increases and the deviation increases, the control device 8 further increases the number of operating compressors by one. That is, in this case as well, the priority order is reversed, so in addition to the compressors 2C and 2B that are already operating, the compressor 2A having the lowest priority order is started and the operation is started (total number of operating units 3). . Thereby, the refrigerant circulation amount is further increased and the cooling capacity is improved.

このようにして低温ショーケース側の冷凍負荷が増大するに応じて圧縮機２Ｃ−２Ｂ−２Ａ順で運転台数を増やしていき、庫内の冷却能力を確保する。尚、冷凍負荷が減少して前記偏差が縮小していくに従い、制御装置８は上記とは逆の順番で先ず圧縮機２Ａを停止し、更に偏差が縮小すれば圧縮機２Ｂも停止する。そして、低圧側圧力が設定値より低下することで圧縮機２Ｃも停止して全停止とする。   In this way, as the refrigeration load on the low temperature showcase side increases, the number of operating units is increased in the order of the compressors 2C-2B-2A, and the cooling capacity in the refrigerator is ensured. As the refrigeration load decreases and the deviation decreases, the control device 8 first stops the compressor 2A in the reverse order to the above, and further stops the compressor 2B if the deviation further decreases. Then, when the low-pressure side pressure is lower than the set value, the compressor 2C is also stopped and fully stopped.

（３）自動切換モード
次に、操作スイッチ１１のモード切換スイッチの操作により、制御装置８が自動切換モードに設定されると、制御装置８は圧縮機２Ａ〜２Ｃを運転する優先順位を先ず前記正順位とする。その後の動作は前記手動モードの場合の正順位のときと同様である。制御装置８はこの正順位の運転開始から積算し、所定期間、例えば１０日が経過すると、今度は優先順位を前記逆順位に切り換える。その後の動作は前記手動モードの場合の逆順位と同様である。そして、この逆順位による運転開始から更に１０日が経過すると、再度正順位に優先順位を戻し、以後これを１０日毎に繰り返す。 (3) Automatic switching mode Next, when the control device 8 is set to the automatic switching mode by operating the mode switching switch of the operation switch 11, the control device 8 first sets the priority order for operating the compressors 2A to 2C. The order is positive. Subsequent operations are the same as those in the normal order in the manual mode. The control device 8 accumulates from the start of operation in the normal order, and when a predetermined period, for example, 10 days elapses, switches the priority order to the reverse order. The subsequent operation is the same as the reverse order in the manual mode. Then, when another 10 days have elapsed from the start of operation in the reverse order, the priority order is returned to the normal order again, and this is repeated every 10 days thereafter.

即ち、制御装置８は１０日毎に最も運転時間が長い圧縮機（正順位の場合には圧縮機２Ａ、逆順位の場合には圧縮機２Ｃ）と最も運転時間が短い圧縮機（正順位の場合には圧縮機２Ｃ、逆順位の場合には圧縮機２Ａ）の優先順位を切り換える。これにより、自動的に各圧縮機２Ａ〜２Ｃの運転時間を平準化することができるようになり、特定の圧縮機（正順位の場合に運転時間が最も長くなる圧縮機２Ａ、逆順位の場合に運転時間が最も長くなる圧縮機２Ｃ）が故障に至り、或いは、それの寿命が短くなる不都合を回避することが可能となる。これは、特に実施例のように各圧縮機２Ａ〜２Ｃの容量が同一である場合に多大な効果を奏する。   That is, the control device 8 has a compressor having the longest operating time every 10 days (compressor 2A in the normal order, compressor 2C in the reverse order) and a compressor having the shortest operating time (in the normal order). The priority order of the compressor 2C and the compressor 2A) in the reverse order are switched. As a result, the operation time of each of the compressors 2A to 2C can be automatically leveled, and a specific compressor (the compressor 2A having the longest operation time in the normal order, the case of the reverse order) In addition, it is possible to avoid the disadvantage that the compressor 2C) having the longest operating time leads to failure or shortens its life. This has a great effect particularly when the capacities of the compressors 2A to 2C are the same as in the embodiment.

また、制御装置８は操作スイッチ１１の所定の操作により、自動切換モードにおける次回切換までの期間に関する情報（例えば、あと何日後に切り替わるか）を表示器１２に表示する。これにより、使用者は圧縮機２Ａ〜２Ｃの運転優先順位がどのくらいの期間で自動切換されるかを容易に確認することができるようになる。また、制御装置８は操作スイッチ１１の所定の操作により、現在の優先順位に関する情報、即ち、現在が正順位か逆順位かを表示器１２に所定の記号等で表示する。これにより、使用者は現在の圧縮機２Ａ〜２Ｃの運転優先順位を容易に確認することができるようになる。   Further, the control device 8 displays information on a period until the next switching in the automatic switching mode (for example, how many days later) on the display 12 by a predetermined operation of the operation switch 11. Thereby, the user can easily confirm how long the operation priority order of the compressors 2A to 2C is automatically switched. Further, the control device 8 displays information on the current priority order, that is, whether the current order is the normal order or the reverse order, with a predetermined symbol or the like on the display 12 by a predetermined operation of the operation switch 11. As a result, the user can easily confirm the current operation priority order of the compressors 2A to 2C.

尚、上記実施例では３台の圧縮機を用いた場合について説明したが、それに限らず、２台或いは４台以上の圧縮機を並列接続して用いた場合にも本発明は有効である。   In the above embodiment, the case where three compressors are used has been described. However, the present invention is not limited to this, and the present invention is also effective when two or four or more compressors are connected in parallel.

本発明の実施例の冷凍機の冷媒回路図である。It is a refrigerant circuit figure of the refrigerator of the Example of this invention.

符号の説明Explanation of symbols

１ 冷凍機
２Ａ〜２Ｃ 圧縮機
３ 凝縮器
４ 膨張弁
６ 蒸発器
８ 制御装置
１１ 操作スイッチ
１２ 表示器 DESCRIPTION OF SYMBOLS 1 Refrigerator 2A-2C Compressor 3 Condenser 4 Expansion valve 6 Evaporator 8 Control apparatus 11 Operation switch 12 Indicator

Claims (5)

並列接続された複数台の圧縮機を備えた冷凍機において、
前記各圧縮機の運転を制御する制御装置を備え、
該制御装置は、負荷に応じて前記圧縮機の運転台数を決定し、所定の優先順位に基づいて前記各圧縮機を運転すると共に、所定期間毎に最も運転時間の長い前記圧縮機と最も運転時間の短い前記圧縮機の優先順位を切り換える自動切換モードを有することを特徴とする冷凍機。 In a refrigerator having a plurality of compressors connected in parallel,
A control device for controlling the operation of each compressor;
The controller determines the number of the compressors to be operated according to the load, operates the compressors based on a predetermined priority order, and operates with the compressor having the longest operating time every predetermined period. A refrigerator having an automatic switching mode for switching the priority of the compressor having a short time. 前記制御装置は、任意に前記優先順位の正逆を切り換える手動モードを有することを特徴とする請求項１の冷凍機。   The refrigerator according to claim 1, wherein the control device has a manual mode in which the priority order is switched arbitrarily. 前記制御装置は表示手段を備え、前記自動切換モードにおける次回切換までの期間に関する情報を前記表示手段にて表示することを特徴とする請求項１又は請求項２の冷凍機。   3. The refrigerator according to claim 1, wherein the control device includes display means, and displays information related to a period until the next switching in the automatic switching mode on the display means. 前記制御装置は、現在の前記優先順位に関する情報を前記表示手段にて表示することを特徴とする請求項３の冷凍機。   The refrigerator according to claim 3, wherein the control device displays information on the current priority order on the display means. 前記各圧縮機は同一容量であることを特徴とする請求項１、請求項２、請求項３又は請求項４の冷凍機。   The refrigerator according to claim 1, 2, 3, or 4, wherein the compressors have the same capacity.
JP2004094907A 2004-03-29 2004-03-29 Refrigerating machine Pending JP2005282896A (en)

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