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JP2020101294A - Refrigerated showcase - Google Patents

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Publication number
JP2020101294A
JP2020101294A JP2017078616A JP2017078616A JP2020101294A JP 2020101294 A JP2020101294 A JP 2020101294A JP 2017078616 A JP2017078616 A JP 2017078616A JP 2017078616 A JP2017078616 A JP 2017078616A JP 2020101294 A JP2020101294 A JP 2020101294A
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Prior art keywords
compressor
temperature
temperature sensor
predetermined value
rotation speed
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JP2017078616A
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Japanese (ja)
Inventor
真佐行 濱田
Masayuki Hamada
真佐行 濱田
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Panasonic Intellectual Property Management Co Ltd
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Panasonic Intellectual Property Management Co Ltd
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Priority to JP2017078616A priority Critical patent/JP2020101294A/en
Priority to EP18784921.1A priority patent/EP3611448B1/en
Priority to PCT/JP2018/006251 priority patent/WO2018190002A1/en
Publication of JP2020101294A publication Critical patent/JP2020101294A/en
Pending legal-status Critical Current

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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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
    • F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
    • F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47F—SPECIAL FURNITURE, FITTINGS, OR ACCESSORIES FOR SHOPS, STOREHOUSES, BARS, RESTAURANTS OR THE LIKE; PAYING COUNTERS
    • A47F3/00—Show cases or show cabinets
    • A47F3/04—Show cases or show cabinets air-conditioned, refrigerated
    • A47F3/0482—Details common to both closed and open types
    • 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
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • 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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D29/00—Arrangement or mounting of control or safety devices
    • 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
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • 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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2400/00—General features of, or devices for refrigerators, cold rooms, ice-boxes, or for cooling or freezing apparatus not covered by any other subclass
    • F25D2400/28—Quick cooling
    • 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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2700/00—Means for sensing or measuring; Sensors therefor
    • F25D2700/12—Sensors measuring the inside temperature

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)

Abstract

【課題】冷蔵ショーケースの冷蔵効果および省エネルギー運転を実現した冷蔵ショーケースを提供すること。【解決手段】圧縮機１、凝縮器２、減圧装置３、蒸発器４が冷媒配管で環状に接続された冷凍回路２０と、蒸発器４に空気を送風し循環させるファン５と、空気の温度を検出する温度センサ６と、制御装置８とを備え、圧縮機１の回転数が一定である通常運転中に、温度センサ６の検出温度が所定値１に到達したとき、圧縮機１の運転を停止させ、その後、温度センサ６の検出温度が所定値２に到達したとき、圧縮機１の運転を開始させ、圧縮機１の回転数が一定である通常運転を実行し、さらに、温度センサ６の検出温度が所定値３に到達したときには、圧縮機１の運転回転数制御を行い、圧縮機１の運転回転数を段階的に低下させていくことを特徴とする冷蔵ショーケース３０である。【選択図】図３PROBLEM TO BE SOLVED: To provide a refrigerated showcase which realizes a refrigerating effect and energy-saving operation of a refrigerated showcase. SOLUTION: A refrigerating circuit 20 in which a compressor 1, a condenser 2, a depressurizing device 3, and an evaporator 4 are connected in a ring shape by a refrigerant pipe, a fan 5 for blowing and circulating air to the evaporator 4, and an air temperature When the detection temperature of the temperature sensor 6 reaches a predetermined value 1 during normal operation in which the temperature sensor 6 and the control device 8 are provided and the rotation speed of the compressor 1 is constant, the compressor 1 is operated. After that, when the detection temperature of the temperature sensor 6 reaches the predetermined value 2, the operation of the compressor 1 is started, the normal operation in which the rotation speed of the compressor 1 is constant is executed, and further, the temperature sensor The refrigerating showcase 30 is characterized in that when the detection temperature of No. 6 reaches a predetermined value 3, the operating rotation speed of the compressor 1 is controlled to gradually reduce the operating rotation speed of the compressor 1. .. [Selection diagram] Fig. 3

Description

本発明は、冷蔵ショーケースに関するものである。 The present invention relates to a refrigerated showcase.

従来、この種の冷蔵ショーケースとして、圧縮機、放熱器、減圧装置、蒸発器を冷媒配管で環状に接続した冷凍回路と、冷蔵対象を配置する保温庫と、蒸発器を通過する空気を庫内に循環させる装置とで構成され、庫内空気温度を圧縮機発停により調整し、対象物を空気温度と同じ温度となるように制御を行なっている（例えば、特許文献１参照）。 Conventionally, as a refrigeration showcase of this type, a refrigeration circuit in which a compressor, a radiator, a pressure reducing device, and an evaporator are annularly connected by a refrigerant pipe, a heat-retaining warehouse in which a refrigeration target is placed, and air passing through the evaporator The internal air temperature is adjusted by starting and stopping the compressor, and the object is controlled to have the same temperature as the air temperature (for example, refer to Patent Document 1).

特開２０１５−７５３１０号公報JP, 2005-75310, A

しかしながら、前記従来の構成では、冷蔵する対象物の温度ではなく、庫内の循環空気温度による圧縮機制御が一般的であり、対象物の温度は考慮せず循環空気温度＝対象物温度として制御を行なうことが一般的であった。 However, in the above-mentioned conventional configuration, the compressor is generally controlled by the temperature of the circulating air in the refrigerator, not the temperature of the object to be refrigerated, and the temperature of the object is not taken into consideration and the temperature of the circulating air is controlled as the object temperature It was common to do

なお、近年の省エネルギーを目的としたインバータによる圧縮機高効率化が進む一方で、この圧縮機回転数制御については、循環空気温度による制御を行なうしかなく、対象物と循環空気の熱容量に大きな差がある場合、対象物が十分に冷却された状態では、循環空気温度と対象物の温度差は小さくほぼ同一となるが、対象物が冷却されていない場合、循環空気温度と対象物の温度差が大きく、循環空気温度で圧縮機制御を行なうと対象物の温度が伴っていないため、対象物が冷却できていないか、あるいは、冷却に時間を要するという課題を有していた。 In addition, while the efficiency of the compressor has been improved by the inverter for the purpose of energy saving in recent years, the control of the rotational speed of the compressor has to be done by the temperature of the circulating air, which causes a large difference in the heat capacity between the object and the circulating air. If the object is sufficiently cooled, the temperature difference between the circulating air temperature and the object is small and almost the same, but if the object is not cooled, the temperature difference between the circulating air temperature and the object is However, when the compressor is controlled by the circulating air temperature, the temperature of the object is not accompanied, so that there is a problem that the object cannot be cooled or it takes time to cool.

本発明は、前記従来の課題を解決するもので、冷蔵効果の向上および省エネルギー運転を実現した冷蔵ショーケースを提供することを目的とする。 The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a refrigerating showcase that realizes improved refrigerating effect and energy-saving operation.

前記従来の課題を解決するために、本発明の冷蔵ショーケースは、圧縮機、凝縮器、減圧装置、蒸発器が冷媒配管で環状に接続された冷凍回路と、前記蒸発器に空気を送風し循環させるファンと、前記空気の温度を検出する温度センサと、制御装置と、を備え、前記制御装置は、前記圧縮機の運転を停止させる前記温度センサの検出温度である所定値１と、前記圧縮機の運転を開始させる前記温度センサの検出温度である所定値２と、前記圧縮機の運転回転数制御を開始する前記温度センサの検出温度である所定値３と、を有し、前記制御装置は、前記圧縮機の回転数が一定である通常運転中に、前記温度センサの検出温度が前記所定値１に到達したとき、前記圧縮機の運転を停止させ、その後、前記温度センサの検出温度が前記所定値２に到達したとき、前記圧縮機の運転を開始させ、前記圧縮機の回転数が一定である通常運転を実行し、さらにその後、前記温度センサの検出温度が前記所定値３に到達したときには、前記圧縮機の運転回転数制御を行い、前記圧縮機の運転回転数を段階的に低下させていくことを特徴とするものである。 In order to solve the conventional problems, the refrigerating showcase of the present invention includes a compressor, a condenser, a pressure reducing device, a refrigeration circuit in which an evaporator is annularly connected by a refrigerant pipe, and air is blown to the evaporator. A fan that circulates, a temperature sensor that detects the temperature of the air, and a control device are provided, and the control device has a predetermined value 1 that is the detection temperature of the temperature sensor that stops the operation of the compressor; The control has a predetermined value 2 which is a temperature detected by the temperature sensor for starting the operation of the compressor, and a predetermined value 3 which is a temperature detected by the temperature sensor for starting the operation speed control of the compressor. The device stops the operation of the compressor when the temperature detected by the temperature sensor reaches the predetermined value 1 during the normal operation in which the rotation speed of the compressor is constant, and then detects the temperature sensor. When the temperature reaches the predetermined value 2, the operation of the compressor is started, the normal operation in which the rotation speed of the compressor is constant is executed, and thereafter, the temperature detected by the temperature sensor is the predetermined value 3. Is reached, the operating speed control of the compressor is performed, and the operating speed of the compressor is gradually reduced.

これにより、対象物の温度が高い状態からの対象物の冷却時間の短縮し、冷蔵効果の向上を実現し、かつ、省エネルギー運転を実現できる。 As a result, it is possible to shorten the cooling time of the target from the state where the temperature of the target is high, improve the refrigerating effect, and realize energy saving operation.

本発明によれば、冷蔵効果の向上および省エネルギー運転を実現した冷蔵ショーケースを提供できる。 ADVANTAGE OF THE INVENTION According to this invention, the refrigerating showcase which improved the refrigerating effect and implement|achieved energy saving operation can be provided.

本発明の実施の形態における冷蔵ショーケースの概略図Schematic diagram of a refrigerated showcase according to an embodiment of the present invention 同冷蔵ショーケースの冷凍サイクル概略図Schematic diagram of the refrigeration cycle of the refrigerated showcase 同圧縮機回転数制御と温度センサの検出温度との温度相関図Temperature correlation diagram between compressor speed control and temperature detected by temperature sensor 同圧縮機回転数制御と温度センサの検出温度との他の温度相関図Another temperature correlation diagram between the compressor speed control and the temperature detected by the temperature sensor 同冷蔵ショーケースの制御装置の構成図Configuration diagram of the control device of the refrigerated showcase

第１の発明は、圧縮機、凝縮器、減圧装置、蒸発器が冷媒配管で環状に接続された冷凍回路と、前記蒸発器に空気を送風し循環させるファンと、前記空気の温度を検出する温度センサと、制御装置と、を備え、前記制御装置は、前記圧縮機の運転を停止させる前記温度センサの検出温度である所定値１と、前記圧縮機の運転を開始させる前記温度センサの検出温度である所定値２と、前記圧縮機の運転回転数制御を開始する前記温度センサの検出温度である所定値３と、を有し、前記制御装置は、前記圧縮機の回転数が一定である通常運転中に、前記温度センサの検出温度が前記所定値１に到達したとき、前記圧縮機の運転を停止させ、その後、前記温度センサの検出温度が前記所定値２に到達したとき、前記圧縮機の運転を開始させ、前記圧縮機の回転数が一定である通常運転を実行し、さらにその後、前記温度センサの検出温度が前記所定値３に到達したときには、前記圧縮機の運転回転数制御を行い、前記圧縮機の運転回転数を段階的に低下させていくことを特徴とする冷蔵ショーケースである。 A first aspect of the present invention detects a refrigeration circuit in which a compressor, a condenser, a pressure reducing device, and an evaporator are annularly connected by a refrigerant pipe, a fan that blows air to the evaporator to circulate the air, and a temperature of the air. A temperature sensor and a control device are provided, and the control device detects a predetermined value 1 that is a detection temperature of the temperature sensor that stops the operation of the compressor and a detection of the temperature sensor that starts the operation of the compressor. The control device has a predetermined value 2 that is a temperature and a predetermined value 3 that is a temperature detected by the temperature sensor that starts the operation rotation speed control of the compressor, and the controller is configured to maintain a constant rotation speed of the compressor. During a certain normal operation, when the temperature detected by the temperature sensor reaches the predetermined value 1, the operation of the compressor is stopped, and thereafter, when the temperature detected by the temperature sensor reaches the predetermined value 2, the When the operation of the compressor is started, the normal operation in which the rotation speed of the compressor is constant is performed, and thereafter, when the temperature detected by the temperature sensor reaches the predetermined value 3, the operation rotation speed of the compressor The refrigerating showcase is characterized in that the operating speed of the compressor is reduced stepwise by performing control.

これにより、循環空気が冷却設定温度に到達するまでは、圧縮機の回転数を減じないため、対象物の早期冷却を可能としながら、冷却後の省エネルギー運転を実現できる。 As a result, the rotational speed of the compressor is not reduced until the circulating air reaches the cooling set temperature, so that it is possible to achieve early cooling of the target object and realize energy-saving operation after cooling.

第２の発明は、特に第１の発明において、前記制御装置は、前記圧縮機の停止中で、停止後所定時間以内に、前記温度センサの検出温度が所定値２に到達せず、その後、前記温度センサの検出温度が前記所定値２に到達したとき、前記圧縮機の運転を開始させ、前記圧縮機の回転数が一定である通常運転を実行し、さらにその後、前記温度センサの検出温度が前記所定値３に到達したときには、前記圧縮機の運転回転数制御を行い、前記圧縮機の運転回転数を段階的に低下させていくことを特徴とする上記第１の発明の冷蔵ショーケース。 In a second aspect of the present invention, in the first aspect of the present invention, the controller does not stop the compressor, and the temperature detected by the temperature sensor does not reach the predetermined value 2 within a predetermined time after the stop. When the temperature detected by the temperature sensor reaches the predetermined value 2, the operation of the compressor is started, the normal operation in which the rotation speed of the compressor is constant is executed, and thereafter, the temperature detected by the temperature sensor. Has reached the predetermined value 3, the operating speed control of the compressor is performed to gradually decrease the operating speed of the compressor, and the refrigerating showcase according to the first aspect of the present invention is characterized. ..

これにより、高温度の対象物の冷却時間を、第１の発明より、更に短縮することが可能となる。 This makes it possible to further reduce the cooling time of the high-temperature object as compared with the first invention.

第３の発明は、特に、第１または第２の発明において、前記圧縮機の運転停止中には、前記ファンを停止しないことを特徴とするものである。 A third invention is characterized in that, in the first or second invention, the fan is not stopped while the operation of the compressor is stopped.

これにより、圧縮機が停止状態に入っても、冷風を循環し続けることにより、対象物を冷却する動作は停止しないため、第１または第２の発明の効果を、さらに増強することが可能となる。 Accordingly, even if the compressor enters the stopped state, the operation of cooling the object is not stopped by continuing the circulation of the cool air, so that it is possible to further enhance the effect of the first or second invention. Become.

以下、本発明の実施の形態について、図面を参照しながら説明する。なお、この実施の形態によって本発明が限定されるものではない。 Embodiments of the present invention will be described below with reference to the drawings. The present invention is not limited to this embodiment.

（実施の形態１）
図１は、本発明の実施の形態１における冷蔵ショーケースの概略図を示すものである。 (Embodiment 1)
FIG. 1 is a schematic diagram of a refrigerating showcase according to Embodiment 1 of the present invention.

図２は、同冷蔵ショーケースの冷凍サイクルの概略構成図を示すものである。 FIG. 2 shows a schematic configuration diagram of a refrigeration cycle of the refrigerated showcase.

図２に示すように、本実施の冷蔵ショーケースの冷却するための冷凍サイクルは、圧縮機１、凝縮器２、減圧装置３、蒸発器４が冷媒配管で順に接続された冷凍回路２０で構成され、蒸発器４を冷蔵ショーケース３０内の冷却のため配置し、その近傍にファン５を配し、冷蔵ショーケース３０の空気を循環させ、冷却対象物７を冷却するよう構成している。 As shown in FIG. 2, the refrigerating cycle for cooling the refrigerating showcase of the present embodiment comprises a refrigerating circuit 20 in which a compressor 1, a condenser 2, a decompression device 3 and an evaporator 4 are connected in sequence by refrigerant pipes. The evaporator 4 is arranged for cooling the refrigerating showcase 30, and the fan 5 is arranged in the vicinity thereof to circulate the air in the refrigerating showcase 30 and cool the object 7 to be cooled.

その冷却対象物７の温度管理のため、蒸発器４の上流側の空気流路に配置された温度センサ６を備え、温度センサ６により検出される循環空気温度にて、圧縮機１とファン５の運転を決定する仕様としている。 In order to control the temperature of the object to be cooled 7, a temperature sensor 6 arranged in the air flow path on the upstream side of the evaporator 4 is provided, and the compressor 1 and the fan 5 are operated at the circulating air temperature detected by the temperature sensor 6. It is a specification that determines the operation of.

本実施の形態では、圧縮機１は、回転数変更が自在なインバータ駆動を、ファン５は発停のみの定速ファンを用い、冷凍回路２０は冷蔵ショーケース３０の下部に収納されている。 In the present embodiment, the compressor 1 is driven by an inverter whose rotation speed is freely changeable, the fan 5 is a constant speed fan that only starts and stops, and the refrigeration circuit 20 is housed in the lower part of the refrigeration showcase 30.

なお、冷凍回路２０は、冷蔵ショーケース３０外に配してもよく、冷蔵ショーケース３０内部の温度センサ６はその位置に指定は無く、ファン５も冷蔵ショーケース３０内部の空気循環に用いるもので、その位置に指定はない。 The refrigeration circuit 20 may be arranged outside the refrigerated showcase 30, the temperature sensor 6 inside the refrigerated showcase 30 is not specified in its position, and the fan 5 is also used for air circulation inside the refrigerated showcase 30. So, there is no designation for that position.

また、図５は、冷蔵ショーケース３０の制御装置の構成を示すものである。制御装置８に、電源、温度センサ６、ファン５、圧縮機１が接続され、温度センサ６で検出された温度を基に、圧縮機１、ファン５の動作を決定する機能を有している。また、圧縮機１のインバータ駆動回路９と制御装置８の指示で動作するが、制御装置一式として構成している。なお、インバータ駆動回路９は別途配してもよく、圧縮機１の回転数制御にあたっての制御機器の構成に指定はない。 Further, FIG. 5 shows a configuration of a control device of the refrigerating showcase 30. A power supply, a temperature sensor 6, a fan 5, and a compressor 1 are connected to the control device 8 and have a function of determining operations of the compressor 1 and the fan 5 based on the temperature detected by the temperature sensor 6. .. Further, although it operates according to the instructions from the inverter drive circuit 9 of the compressor 1 and the controller 8, it is configured as a complete controller. The inverter drive circuit 9 may be separately arranged, and the configuration of the control device for controlling the rotation speed of the compressor 1 is not specified.

以上のように構成された冷蔵ショーケースについて、以下その動作、作用を説明する。 The operation and action of the refrigerated showcase configured as described above will be described below.

図３、図４は、本実施の形態１における圧縮機回転数制御と温度センサの検出温度との温度相関図である。 3 and 4 are temperature correlation diagrams between the compressor rotation speed control and the temperature detected by the temperature sensor in the first embodiment.

縦軸に温度センサ６で検出された冷蔵ショーケース３０の内部の循環空気の温度、冷却対象物７の温度、圧縮機１の発停と回転数変化、また、圧縮機１の発停と回転数上昇、低下を示し、横軸は時間経過を示している。 The temperature of the circulating air inside the refrigerating showcase 30 detected by the temperature sensor 6 on the vertical axis, the temperature of the object 7 to be cooled, the start and stop of the compressor 1 and the change in the rotational speed, and the start and stop and the rotation of the compressor 1. The numbers increase and decrease, and the horizontal axis indicates the passage of time.

まず、圧縮機１を最大能力（最大回転数）で作動させ、温度センサ６の検出値が圧縮機１の停止温度（所定値１）に到達したら、一旦、圧縮機１を停止させ、さらに、温度センサ６の検出値が、圧縮機１の起動温度（所定値２）に到達したら、圧縮機１を再度起動させる。 First, the compressor 1 is operated at the maximum capacity (maximum rotation speed), and when the detection value of the temperature sensor 6 reaches the stop temperature of the compressor 1 (predetermined value 1), the compressor 1 is stopped once, and further, When the detected value of the temperature sensor 6 reaches the starting temperature (predetermined value 2) of the compressor 1, the compressor 1 is restarted.

なお、圧縮機１の作動に伴い、循環空気温度（温度センサ６の検出値）が降下し、温度センサ６の検出値が、圧縮機の回転数低減開始温度（所定値３）に到達したら、圧縮機１の回転数制御、すなわちインバータ制御に移行する。 In addition, when the circulating air temperature (the detection value of the temperature sensor 6) decreases with the operation of the compressor 1 and the detection value of the temperature sensor 6 reaches the rotation speed reduction start temperature of the compressor (predetermined value 3), The control shifts to the rotation speed control of the compressor 1, that is, the inverter control.

温度センサ６の検出値は、設定された圧縮機回転数を保持開始する温度（所定値４）に低下するまで、圧縮機１の回転数を段階的に小さくし、所定値４に到達してから、圧縮機１の回転数を一定の低速度運転を保持する構成となっている。 The detection value of the temperature sensor 6 gradually decreases the number of revolutions of the compressor 1 until it reaches a temperature (predetermined value 4) at which the set number of revolutions of the compressor starts to be held, and reaches a predetermined value 4. Therefore, the compressor 1 has a configuration in which the rotation speed of the compressor 1 is maintained at a constant low speed operation.

以上のように、本実施の形態１においては、循環空気温度（温度センサ６の検出値）が前記所定値１に到達するまでは、圧縮機１の回転数制御を行わず、圧縮機１は最大能力（最大回転数）で継続して運転を行なっていることで、循環空気の温度を短時間内に低下させることができる。 As described above, in the first embodiment, the rotation speed control of the compressor 1 is not performed until the circulating air temperature (the detection value of the temperature sensor 6) reaches the predetermined value 1, and the compressor 1 The temperature of the circulating air can be reduced within a short time by continuously operating at the maximum capacity (maximum speed).

循環空気の温度は所定値１になった後に、圧縮機１を一旦停止する間に、高温の対象物の影響で、循環空気温度（温度センサ６の検出値）は所定値２に回復し、圧縮機１の作動により、循環空気温度（温度センサ６の検出値）が所定値３まで低下する時点で、回転数制御に移行することで、対象物の冷却を短縮しながら冷却後の発停の回数を減じ、省エネルギーと冷却時間の短縮を両立できる。 After the temperature of the circulating air reaches the predetermined value 1, the temperature of the circulating air (detected value of the temperature sensor 6) is restored to the predetermined value 2 due to the influence of the high temperature object while the compressor 1 is temporarily stopped. When the circulating air temperature (detection value of the temperature sensor 6) decreases to a predetermined value 3 due to the operation of the compressor 1, the rotation speed control is performed to shorten the cooling of the object and start/stop after cooling. By reducing the number of times, it is possible to achieve both energy saving and shortening of cooling time.

また、最大能力（最大回転数）での圧縮機運転は、他保護などによる回転数制御は実施する場合がある。なお、回転数制御状態から、回転数制御を実施しない状態への移行は、所定の温度以上になった場合や、電源が停止された場合に行うが、その方法に指定は無い。 Further, in the compressor operation at the maximum capacity (maximum rotation speed), the rotation speed may be controlled by other protection. The transition from the rotational speed control state to the state in which the rotational speed control is not performed is performed when the temperature exceeds a predetermined temperature or when the power supply is stopped, but the method is not specified.

さらに、本実施形態において、圧縮機１の待機時間内での循環空気温度（温度センサ６の検出値）の上昇速度により、圧縮機１の回転数を制御することもできる。 Further, in the present embodiment, the rotation speed of the compressor 1 can be controlled by the rising speed of the circulating air temperature (the detection value of the temperature sensor 6) during the standby time of the compressor 1.

圧縮機１が最大回転数で作動して、循環空気温度（温度センサ６の検出値）が所定値１に達した後、圧縮機１の停止時間内に一定の基準時間を設け、この基準時間内に循環空気温度（温度センサ６の検出値）の上昇幅により、次の段階で圧縮機１の回転数を制御するか否かを判断する。 After the compressor 1 operates at the maximum number of revolutions and the circulating air temperature (the detection value of the temperature sensor 6) reaches the predetermined value 1, a fixed reference time is provided within the stop time of the compressor 1, and this reference time is set. Whether or not the rotation speed of the compressor 1 is controlled is determined in the next step based on the rise width of the circulating air temperature (detection value of the temperature sensor 6).

図４に示すように、循環空気温度（温度センサ６の検出値）が基準時間内に所定値２に到達すれば、圧縮機１を続いて最大能力（最大回転数）で運転して、循環空気温度（温度センサ６の検出値）は所定値３に到達する際に、圧縮機１の回転数制御に移行しない。 As shown in FIG. 4, when the circulating air temperature (detection value of the temperature sensor 6) reaches the predetermined value 2 within the reference time, the compressor 1 is continuously operated at the maximum capacity (maximum speed) to circulate. When the air temperature (value detected by the temperature sensor 6) reaches the predetermined value 3, the rotation speed control of the compressor 1 is not performed.

循環空気温度（温度センサ６の検出値）は、所定時間内に所定値２に到達してない場合のみ、圧縮機１を続いて最大能力（最大回転数）で運転して循環空気温度（温度センサ６の検出値）が所定値３に到達する際に、圧縮機１の回転数制御に移行することとなる構成をしている。 Only when the circulating air temperature (detection value of the temperature sensor 6) does not reach the predetermined value 2 within the predetermined time, the compressor 1 is continuously operated at the maximum capacity (maximum speed) and the circulating air temperature (temperature When the (detection value of the sensor 6) reaches the predetermined value 3, the rotation speed control of the compressor 1 is performed.

これにより、圧縮機１の最大能力（最大回転数）にて、冷却対象物７を十分冷却することで、冷却対象物７の冷却時間を更に短縮することが可能となる。 As a result, the cooling time of the cooling target 7 can be further shortened by sufficiently cooling the cooling target 7 with the maximum capacity (maximum speed) of the compressor 1.

また、通常、圧縮機１停止時は、保冷を重視し空気循環は停止するが、回転数制御への移行前は、圧縮機１の停止中にファン５を停止しないことで、循環空気と冷却対象物７の熱交換を促進し、温度センサ６の検出温度を冷却対象物７の温度に近い値とすることで、冷却時間の短縮と過度の冷却を予防している。 Further, normally, when the compressor 1 is stopped, the cooling of the air is emphasized and the air circulation is stopped. However, before the shift to the rotation speed control, the fan 5 is not stopped while the compressor 1 is stopped, so that the circulation air and the cooling are cooled. By promoting heat exchange of the target object 7 and setting the temperature detected by the temperature sensor 6 to a value close to the temperature of the cooling target object 7, the cooling time is shortened and excessive cooling is prevented.

以上のように、本発明にかかる冷蔵ショーケースは、冷蔵効果の向上および省エネルギー運転を実現できるため、インバータ圧縮機を搭載した冷蔵庫、自動販売機等の保冷装置に適応することが可能である。 As described above, since the refrigerating showcase according to the present invention can improve the refrigerating effect and realize energy saving operation, it can be applied to a refrigerator such as a refrigerator equipped with an inverter compressor or a vending machine.

１ 圧縮機
２ 凝縮器
３ 減圧装置
４ 蒸発器
５ ファン
６ 温度センサ
７ 冷却対象物
８ 制御装置
９ インバータ駆動回路
２０ 冷凍回路
３０ 冷蔵ショーケース
1 Compressor 2 Condenser 3 Decompression device 4 Evaporator 5 Fan 6 Temperature sensor 7 Cooling target 8 Control device 9 Inverter drive circuit 20 Refrigeration circuit 30 Refrigeration showcase

Claims (3)

圧縮機、凝縮器、減圧装置、蒸発器が冷媒配管で環状に接続された冷凍回路と、
前記蒸発器に空気を送風し循環させるファンと、
前記空気の温度を検出する温度センサと、
制御装置と、
を備え、
前記制御装置は、
前記圧縮機の運転を停止させる前記温度センサの検出温度である所定値１と、
前記圧縮機の運転を開始させる前記温度センサの検出温度である所定値２と、
前記圧縮機の運転回転数制御を開始する前記温度センサの検出温度である所定値３と、
を有し、
前記制御装置は、前記圧縮機の回転数が一定である通常運転中に、前記温度センサの検出温度が前記所定値１に到達したとき、前記圧縮機の運転を停止させ、
その後、前記温度センサの検出温度が前記所定値２に到達したとき、前記圧縮機の運転を開始させ、前記圧縮機の回転数が一定である通常運転を実行し、
さらにその後、前記温度センサの検出温度が前記所定値３に到達したときには、前記圧縮機の運転回転数制御を行い、前記圧縮機の運転回転数を段階的に低下させていくことを特徴とする冷蔵ショーケース。 A refrigeration circuit in which a compressor, a condenser, a decompression device, and an evaporator are annularly connected by a refrigerant pipe,
A fan that blows air into the evaporator to circulate it,
A temperature sensor for detecting the temperature of the air,
A control device,
Equipped with
The control device is
A predetermined value 1 which is the temperature detected by the temperature sensor for stopping the operation of the compressor;
A predetermined value 2 which is the temperature detected by the temperature sensor for starting the operation of the compressor;
A predetermined value 3 which is a temperature detected by the temperature sensor for starting the operation speed control of the compressor;
Have
The controller stops the operation of the compressor when the temperature detected by the temperature sensor reaches the predetermined value 1 during the normal operation in which the rotation speed of the compressor is constant,
After that, when the temperature detected by the temperature sensor reaches the predetermined value 2, the operation of the compressor is started, and the normal operation in which the rotation speed of the compressor is constant is executed,
After that, when the detected temperature of the temperature sensor reaches the predetermined value 3, the operating speed control of the compressor is performed and the operating speed of the compressor is gradually reduced. Refrigerated showcase. 前記制御装置は、前記圧縮機の停止中で、停止後所定時間以内に、前記温度センサの検出温度が所定値２に到達せず、その後、前記温度センサの検出温度が前記所定値２に到達したとき、前記圧縮機の運転を開始させ、前記圧縮機の回転数が一定である通常運転を実行し、
さらにその後、前記温度センサの検出温度が前記所定値３に到達したときには、前記圧縮機の運転回転数制御を行い、前記圧縮機の運転回転数を段階的に低下させていくことを特徴とする前記請求項１に記載の冷蔵ショーケース。 While the compressor is stopped, the control device does not allow the temperature detected by the temperature sensor to reach the predetermined value 2 within a predetermined time after the stop, and then the temperature detected by the temperature sensor reaches the predetermined value 2. Then, the operation of the compressor is started, and the normal operation in which the rotation speed of the compressor is constant,
After that, when the detected temperature of the temperature sensor reaches the predetermined value 3, the operating speed control of the compressor is performed and the operating speed of the compressor is gradually reduced. The refrigerated showcase according to claim 1. 前記圧縮機の運転停止中には、前記ファンを停止しないことを特徴とする前記請求項１または２に記載の冷蔵ショーケース。
The refrigerating showcase according to claim 1 or 2, wherein the fan is not stopped while the operation of the compressor is stopped.
JP2017078616A 2017-04-12 2017-04-12 Refrigerated showcase Pending JP2020101294A (en)

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