JP5056026B2 - vending machine - Google Patents

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JP5056026B2
JP5056026B2 JP2007013952A JP2007013952A JP5056026B2 JP 5056026 B2 JP5056026 B2 JP 5056026B2 JP 2007013952 A JP2007013952 A JP 2007013952A JP 2007013952 A JP2007013952 A JP 2007013952A JP 5056026 B2 JP5056026 B2 JP 5056026B2
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refrigerant
internal
stage compressor
vending machine
temperature
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正樹 高橋
敏章 土屋
浩司 滝口
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Fuji Electric Retail Systems Co Ltd
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本発明は自動販売機、特に、容器に入った飲料等を冷却や加熱して販売する自動販売機に関する。   The present invention relates to a vending machine, and more particularly to a vending machine that sells a beverage or the like contained in a container by cooling or heating.

たとえば、容器に入った飲料等(以下「商品」と称す)の自動販売機は、断熱材によって包囲された筐体の内部が、複数の商品収納庫に仕切られ、商品収納庫のそれぞれは、収納している商品や季節に応じて冷却されたり加熱されたり適宜切り替えられている。すなわち、自動販売機には、公知の冷凍サイクルを実現する冷却ユニットが設置され、冷却ユニットを構成する蒸発器の吸熱によって、商品収納室の冷却が実行され、商品収納室に電熱ヒータが設置され、これによって加熱が実行されていた。
近年、環境保全の要請から冷媒がフロン系からHC(ハイドロカーボン)に変更され、また、省エネの要請から冷媒にHCを使用し、HC冷媒の温熱を有効利用すべく、該温熱を商品の加熱に使用する発明が開示されている(例えば、特許文献1参照)。
For example, in a vending machine for beverages (hereinafter referred to as “products”) contained in a container, the inside of a casing surrounded by a heat insulating material is partitioned into a plurality of product storages, Depending on the product and the season in which it is stored, it is cooled or heated and switched accordingly. That is, the vending machine is provided with a cooling unit that realizes a known refrigeration cycle, the product storage room is cooled by the heat absorption of the evaporator constituting the cooling unit, and an electric heater is installed in the product storage room. This caused heating to be performed.
In recent years, refrigerants have been changed from chlorofluorocarbons to HC (hydrocarbon) due to environmental conservation requirements, and HC has been used for refrigerants due to energy conservation requirements, and the thermal energy of the HC refrigerant is used to effectively heat the product. The invention to be used is disclosed (for example, see Patent Document 1).

特開2003−173467号公報(第4頁、図1)Japanese Patent Laying-Open No. 2003-173467 (page 4, FIG. 1)

特許文献1に開示された発明は、HC冷媒を用いた冷凍サイクルで発生する冷熱を商品の冷却に、温熱を商品の加熱に用いるため、省エネが進むと共に、余剰となった冷熱または温熱を自動販売機の筐体表面から放熱させるため、放熱が容易になるものである。このため、放熱のためのファンの運転騒音が抑えられ、室内設置に好適な自動販売機を提供するとの効果を奏するものである。
しかしながら、特許文献1に開示された発明は、商品収納室を加熱する際、商品収納室の空気(以下「庫内空気」と称す)を55℃程度に高める必要があるところ、二段圧縮機によって圧縮された冷媒の温度(以下「吐出温度」と称す)は、二段圧縮機の運転開始直後は上昇が遅いという問題があった。このため、商品が所定の温度を到達するまでに所定の時間を要し、販売可能になるまでに所定の待ち時間を必要としていた。また、吐出温度の低さに応じて加熱運転の効率が悪くなっていた。
The invention disclosed in Patent Document 1 uses cold heat generated in a refrigeration cycle using HC refrigerant for product cooling and warm heat for product heating, so energy saving progresses and excess cold or hot heat is automatically used. Since heat is dissipated from the housing surface of the vending machine, heat dissipation is facilitated. For this reason, the operation noise of the fan for heat dissipation is suppressed, and there is an effect that a vending machine suitable for indoor installation is provided.
However, in the invention disclosed in Patent Document 1, when the product storage chamber is heated, the air in the product storage chamber (hereinafter referred to as “compartment air”) needs to be increased to about 55 ° C. The temperature of the refrigerant compressed by the above (hereinafter referred to as “discharge temperature”) has a problem that the rise is slow immediately after the start of operation of the two-stage compressor. For this reason, a predetermined time is required until the product reaches a predetermined temperature, and a predetermined waiting time is required before the product can be sold. In addition, the efficiency of the heating operation has deteriorated according to the low discharge temperature.

本発明は上記に鑑みて想到されたものであって、二段圧縮機の運転開始直後の吐出温度を高めることができ、もって前記待ち時間の短縮や加熱運転の効率向上を可能にする自動販売機を提供することを目的とする。   The present invention has been conceived in view of the above, and it is possible to increase the discharge temperature immediately after the start of the operation of the two-stage compressor, thereby enabling the vending to reduce the waiting time and improve the efficiency of the heating operation. The purpose is to provide a machine.

(1)本発明に係る自動販売機(請求項1)は、冷媒を圧縮する二段圧縮機と、冷媒を冷却する中間熱交換器およびガスクーラと、冷媒を膨張する膨張手段と、冷媒を蒸発させる複数の庫内蒸発器と、を具備する冷却ユニットと、
筐体内に設置された仕切板によって仕切られ、前記複数の庫内蒸発器がそれぞれ設置された複数の商品収納庫と、
運転モードに応じて前記複数の庫内蒸発器のそれぞれに、冷媒の供給開始または供給停止を制御する制御手段と、を有す自動販売機であって、
前記制御手段が、冷媒を前記二段圧縮機から前記複数の庫内蒸発器のうちの一方の庫内蒸発器に直接供給した後、前記膨張手段および前記中間熱交換器を経由して前記二段圧縮機に戻す運転モードを実行させるとき、前記二段圧縮機によって圧縮された冷媒の温度に基づいて、前記二段圧縮機の運転周波数を変更することを特徴とする。
(1) A vending machine according to the present invention (Claim 1) includes a two-stage compressor for compressing a refrigerant, an intermediate heat exchanger and a gas cooler for cooling the refrigerant, an expansion means for expanding the refrigerant, and evaporating the refrigerant. A plurality of internal evaporators, and a cooling unit comprising:
A plurality of product storage compartments partitioned by a partition plate installed in the housing, and each of the plurality of internal evaporators installed;
A vending machine having control means for controlling supply start or supply stop of the refrigerant in each of the plurality of internal evaporators according to an operation mode,
The control means directly supplies the refrigerant from the two-stage compressor to one of the plurality of internal evaporators, and then passes the second refrigerant via the expansion means and the intermediate heat exchanger. When the operation mode for returning to the two-stage compressor is executed, the operation frequency of the two-stage compressor is changed based on the temperature of the refrigerant compressed by the two-stage compressor.

(2)本発明に係る自動販売機(請求項2)は、 冷媒を圧縮する二段圧縮機と、冷媒を冷却する中間熱交換器およびガスクーラと、冷媒を膨張する膨張手段と、冷媒を蒸発させる複数の庫内蒸発器と、を具備する冷却ユニットと、
筐体内に設置された仕切板によって仕切られ、前記複数の庫内蒸発器がそれぞれ設置された複数の商品収納庫と、
運転モードに応じて前記複数の庫内蒸発器のそれぞれに、冷媒の供給開始または供給停止を制御する制御手段と、を有す自動販売機であって、
前記制御手段が、冷媒を前記二段圧縮機から前記複数の庫内蒸発器のうちの一方の庫内蒸発器に直接供給した後、前記膨張手段および前記複数の庫内蒸発器のうちの他方の庫内蒸発器を経由して前記二段圧縮機に戻す運転モードを実行させるとき、前記二段圧縮機によって圧縮された冷媒の温度に基づいて、前記二段圧縮機の運転周波数を変更することを特徴とする。
(2) A vending machine according to the present invention (Claim 2) includes a two-stage compressor that compresses a refrigerant, an intermediate heat exchanger and a gas cooler that cool the refrigerant, expansion means that expands the refrigerant, and evaporation of the refrigerant. A plurality of internal evaporators, and a cooling unit comprising:
A plurality of product storage compartments partitioned by a partition plate installed in the housing, and each of the plurality of internal evaporators installed;
A vending machine having control means for controlling supply start or supply stop of the refrigerant in each of the plurality of internal evaporators according to an operation mode,
After the control means directly supplies the refrigerant from the two-stage compressor to one of the plurality of internal evaporators, the other of the expansion means and the plurality of internal evaporators When the operation mode for returning to the two-stage compressor via the internal evaporator is executed, the operation frequency of the two-stage compressor is changed based on the temperature of the refrigerant compressed by the two-stage compressor. It is characterized by that.

(3)本発明に係る自動販売機(請求項3)は、前記(1)または(2)において、前記制御手段が、冷媒を前記二段圧縮機から前記複数の庫内蒸発器のうちの一方の庫内蒸発器に直接供給した後、前記ガスクーラを経由して前記膨張手段に供給することを特徴とする。
(4)本発明に係る自動販売機(請求項4)は、前記(1)乃至(3)において、前記制御手段が、前記二段圧縮機によって圧縮された冷媒の温度が所定の温度に到達するまで、前記二段圧縮機を所定の周波数で運転し、前記二段圧縮機によって圧縮された冷媒の温度が所定の温度に到達した後は、前記二段圧縮機を前記所定の周波数よりも低い周波数で運転することを特徴とする。
(5)本発明に係る自動販売機(請求項5)は、前記(1)乃至(4)において、前記二段圧縮機によって圧縮された冷媒の温度が、前記冷媒が供給される庫内蒸発器の入口に接続された配管の温度であることを特徴とする。
(3) In the vending machine according to the present invention (Claim 3), in the above (1) or (2), the control means sends the refrigerant from the two-stage compressor to the plurality of internal evaporators. After supplying directly to one internal evaporator, it supplies to the said expansion means via the said gas cooler, It is characterized by the above-mentioned.
(4) In the vending machine according to the present invention (Claim 4), in the above (1) to (3), the temperature of the refrigerant compressed by the two-stage compressor reaches a predetermined temperature. Until the temperature of the refrigerant compressed by the two-stage compressor reaches a predetermined temperature, the two-stage compressor is operated at a frequency higher than the predetermined frequency. It is characterized by operating at a low frequency.
(5) In the vending machine according to the present invention (Claim 5), in (1) to (4), the temperature of the refrigerant compressed by the two-stage compressor is the evaporation inside the cabinet to which the refrigerant is supplied. The temperature of the pipe connected to the inlet of the vessel.

(6)本発明に係る自動販売機(請求項6)は、前記(1)において、前記膨張手段に流入する前の冷媒と、前記中間熱交換器から流出した後の冷媒との間で熱交換をする内部熱交換器を有することを特徴とする。
(7)本発明に係る自動販売機(請求項7)は、前記(2)において、前記膨張手段に流入する前の冷媒と、前記複数の庫内蒸発器のうちの他方の庫内蒸発器から流出した後の冷媒との間で熱交換をする内部熱交換器を有することを特徴とする。
(6) In the vending machine according to the present invention (Claim 6), in (1), heat is generated between the refrigerant before flowing into the expansion means and the refrigerant after flowing out from the intermediate heat exchanger. It has an internal heat exchanger for exchanging.
(7) In the vending machine according to the present invention (Claim 7), in (2), the refrigerant before flowing into the expansion means and the other internal evaporator of the plurality of internal evaporators It has an internal heat exchanger which exchanges heat with the refrigerant | coolant after flowing out from.

(i)本発明の請求項1に係る自動販売機は、制御手段が、冷媒を二段圧縮機から一方の庫内蒸発器に直接供給した後、膨張手段および中間熱交換器を経由して二段圧縮機に戻す運転モード(たとえば、HHモード、Hモード等)を実行するとき、前記二段圧縮機によって圧縮された冷媒の温度(以下「吐出温度」と称す)に基づいて、二段圧縮機の運転周波数を変更するから、吐出温度の立ち上がりが早くなる。よって、前記待ち時間の短縮や加熱運転の効率向上が可能になる。   (I) In the vending machine according to claim 1 of the present invention, the control means directly supplies the refrigerant from the two-stage compressor to one of the internal evaporators, and then passes through the expansion means and the intermediate heat exchanger. When an operation mode (for example, HH mode, H mode, etc.) for returning to the two-stage compressor is executed, a two-stage operation is performed based on the temperature of the refrigerant compressed by the two-stage compressor (hereinafter referred to as “discharge temperature”). Since the operating frequency of the compressor is changed, the discharge temperature rises quickly. Therefore, the waiting time can be shortened and the efficiency of the heating operation can be improved.

(ii)本発明の請求項2に係る自動販売機は、制御手段が、冷媒を二段圧縮機から一方の庫内蒸発器に直接供給した後、膨張手段および他方の庫内蒸発器を経由して二段圧縮機に戻す運転モード(たとえば、CHHモード、CCHモード等)を実行するとき、前記二段圧縮機によって圧縮された冷媒の温度(以下「吐出温度」と称す)に基づいて、二段圧縮機の運転周波数を変更するから、吐出温度の立ち上がりが早くなる。よって、前記待ち時間の短縮や加熱運転の効率向上が可能になる。   (Ii) In the vending machine according to claim 2 of the present invention, the control means directly supplies the refrigerant from the two-stage compressor to one of the internal evaporators, and then passes through the expansion means and the other internal evaporator. When performing an operation mode (for example, CHH mode, CCH mode, etc.) for returning to the two-stage compressor, based on the temperature of the refrigerant compressed by the two-stage compressor (hereinafter referred to as “discharge temperature”), Since the operating frequency of the two-stage compressor is changed, the discharge temperature rises quickly. Therefore, the waiting time can be shortened and the efficiency of the heating operation can be improved.

(iii)本発明の請求項3に係る自動販売機は、前記制御手段が、冷媒をガスクーラを経由してから膨張手段に供給するから、膨張手段に流入する際の冷媒温度が低くなり、膨張手段の負担が低減する。
(iv)本発明の請求項4に係る自動販売機は、前記制御手段が、吐出温度が所定の温度(以下「設定吐出温度」と称す)に到達するまで、二段圧縮機を高い周波数で運転し、設定吐出温度に到達した後は、二段圧縮機を低い周波数で運転するから、制御が簡素になると共に、吐出温度の立ち上がり時間が短くなり、また、立ち上がり後の消費電力を抑えることができる。
(v)本発明の請求項5に係る自動販売機は、吐出温度が庫内蒸発器の入口に接続された配管の温度であるから、吐出温度の測定が簡単になる。
(Iii) In the vending machine according to claim 3 of the present invention, since the control means supplies the refrigerant to the expansion means after passing through the gas cooler, the refrigerant temperature when flowing into the expansion means becomes low, and the expansion The burden on the means is reduced.
(Iv) In the vending machine according to claim 4 of the present invention, the control means causes the two-stage compressor to operate at a high frequency until the discharge temperature reaches a predetermined temperature (hereinafter referred to as “set discharge temperature”). After operation and the set discharge temperature is reached, the two-stage compressor is operated at a low frequency, so control is simplified, discharge temperature rise time is shortened, and power consumption after startup is reduced. Can do.
(V) In the vending machine according to claim 5 of the present invention, since the discharge temperature is the temperature of the pipe connected to the inlet of the internal evaporator, the discharge temperature can be easily measured.

(vi)本発明の請求項6に係る自動販売機は、膨張手段に流入する前の冷媒(温熱を有する)と、中間熱交換器から流出した後の冷媒(冷熱を有する)との間で熱交換をする内部熱交換器を有するから、冷凍サイクルの系外に放散される熱量が低減し、結果として圧縮機の負担が低減する。
(vii)本発明の請求項7に係る自動販売機は、膨張手段に流入する前の冷媒(温熱を有する)と、他方の庫内蒸発器から流出した後の冷媒(冷熱を有する)との間で熱交換をする内部熱交換器を有するから、冷凍サイクルの系外に放散される熱量が低減し、結果として圧縮機の負担が低減する。
(Vi) In the vending machine according to claim 6 of the present invention, the refrigerant (having warm temperature) before flowing into the expansion means and the refrigerant (having cold energy) after flowing out from the intermediate heat exchanger. Since it has an internal heat exchanger that performs heat exchange, the amount of heat dissipated outside the system of the refrigeration cycle is reduced, and as a result, the burden on the compressor is reduced.
(Vii) The vending machine according to claim 7 of the present invention includes a refrigerant (having hot heat) before flowing into the expansion means and a refrigerant (having cold heat) after flowing out from the other internal evaporator. Since it has an internal heat exchanger that exchanges heat between them, the amount of heat dissipated outside the system of the refrigeration cycle is reduced, and as a result, the burden on the compressor is reduced.

(自動販売機)
図1および図2は本発明の実施の形態に係る自動販売機を説明するものであって、図1は正面視の断面図、図2は側面視の断面図である。図1および図2において、自動販売機1000は、本体のキャビネット(以下「筐体」と称す)200と、筐体200の内部で断熱材300に包囲された商品収納庫401と、商品Sを補充する時に商品収納庫401を開閉する商品補充用扉404と、商品収納庫401と外気を遮断するための内扉405と、自動販売機1000の前扉406と、を有している。商品収納庫401は仕切り板403AB、403BCによって商品収納室402A、402B、402Cに仕切られている。
なお、以下の説明において、商品収納室402A、402B、402Cにおいて共通する内容については添え字「A、B、C」の記載を省略し、同じ部分または相当する部分には同じ符号を付し、一部の説明を省略する。
(vending machine)
1 and 2 illustrate a vending machine according to an embodiment of the present invention. FIG. 1 is a front sectional view, and FIG. 2 is a side sectional view. 1 and 2, a vending machine 1000 includes a main body cabinet (hereinafter referred to as a “casing”) 200, a product storage box 401 surrounded by a heat insulating material 300 inside the housing 200, and a product S. A product replenishing door 404 that opens and closes the product storage 401 when replenishing, an inner door 405 for shutting off the product storage 401 and outside air, and a front door 406 of the vending machine 1000 are provided. The product storage 401 is partitioned into product storage chambers 402A, 402B, and 402C by partition plates 403AB and 403BC.
In the following description, the description of the subscripts “A, B, C” is omitted for the contents common in the product storage rooms 402A, 402B, 402C, and the same or corresponding parts are denoted by the same reference numerals. Some explanations are omitted.

各商品収納室402には、商品Sを収納するための商品収納ラック407と、商品収納ラック407から自然落下した商品Sを取出すための商品取出し口409と、商品Sを商品取出し口409まで誘導する商品誘導板(通気孔が設けられている、以下「シュータ」と称す)408とが設置され、シュータ408の下方が庫内部品収納室410となっている。また、庫内空気を商品収納ラック407を経由して庫内部品収納室410に循環させるための循環ダクト420が設置されている。
そして、庫内部品収納室410には、庫内空気をシュータ408を通過して商品Sに衝突させる送風手段(以下「庫内ファン」と称す)430と、庫内ファン430の下流側(循環ダクト420から遠い側)に庫内熱交換器440と、庫内ファン430および庫内熱交換器440を収納する送風ダクト450と、送風ダクト450に連通して空気を通す風胴460と、庫内空気の温度を計測する庫内温度センサ500とが設置されている。
さらに、商品収納庫401の下方には、冷却ユニット100のコンデンシングユニット470および庫外ファン(以下「ガスクーラ用ファン」と称す)600を収納するための機械室700と、電装品を収納するための電装品収納室800とが配置されている。
In each product storage room 402, a product storage rack 407 for storing the product S, a product take-out port 409 for taking out the product S that has fallen naturally from the product storage rack 407, and the product S are guided to the product take-out port 409. A product guide plate (which is provided with a vent hole, hereinafter referred to as “shooter”) 408 is installed, and the lower part of the shooter 408 is an internal component storage chamber 410. In addition, a circulation duct 420 is provided for circulating the internal air to the internal component storage chamber 410 via the commodity storage rack 407.
In the internal component storage chamber 410, air blowing means (hereinafter referred to as “internal fan”) 430 that causes the internal air to pass through the shooter 408 and collide with the product S, and the downstream side (circulation) of the internal fan 430. On the far side from the duct 420), the internal heat exchanger 440, the internal fan 430 and the internal heat exchanger 440 are accommodated, the wind duct 450 that communicates with the air duct 450 and passes air, An internal temperature sensor 500 for measuring the temperature of the internal air is installed.
Further, below the product storage 401, a machine room 700 for storing the condensing unit 470 of the cooling unit 100 and an external fan (hereinafter referred to as “fan for gas cooler”) 600, and electrical components are stored. The electrical component storage chamber 800 is arranged.

(冷却ユニット)
図3は図1に示す自動販売機に設置された冷却加熱装置を説明する構成図である。図3において、冷却ユニット100は自動販売機1000に設置されるものであって、冷媒を圧縮する第1圧縮部1aおよび第2圧縮部1bを具備する二段圧縮機(以下「圧縮機」と称す)1と、圧縮機1の第1圧縮部1aにおいて圧縮された冷媒を冷却する中間熱交換器2と、圧縮機1の第2圧縮部1bにおいて圧縮された冷媒(以下「高圧高温冷媒」と称する場合がある)が供給され、これを冷却する庫外凝縮器(以下「ガスクーラ」と称す)4とを有する。
(Cooling unit)
FIG. 3 is a block diagram illustrating a cooling and heating device installed in the vending machine shown in FIG. In FIG. 3, a cooling unit 100 is installed in a vending machine 1000, and is a two-stage compressor (hereinafter referred to as “compressor”) that includes a first compressor 1a and a second compressor 1b that compress refrigerant. 1), an intermediate heat exchanger 2 that cools the refrigerant compressed in the first compression section 1a of the compressor 1, and a refrigerant compressed in the second compression section 1b of the compressor 1 (hereinafter referred to as “high-pressure high-temperature refrigerant”). And an external condenser (hereinafter referred to as “gas cooler”) 4 for cooling the same.

さらに、ガスクーラ4により冷却された冷媒を膨張する膨張手段(たとえば、電子膨張弁)7と、膨張手段7により膨張された冷媒(以下「低圧低温冷媒」と称する場合がある)を蒸発させる庫内蒸発器8とを有する。すなわち、冷却ユニット100は基本的には、冷媒が圧縮機1、ガスクーラ4、膨張手段7、庫内蒸発器8を順番に経由した後、圧縮機1に戻るような循環をすることで、冷凍サイクルを実行している。
また、膨張手段7(正確にはキャピラリーチューブ6)に流入直前の冷媒(温熱を有する)と、圧縮機1に戻る直前の冷媒(温熱を有する)との間で熱交換をする内部熱交換器5が設置されている。
そして、庫内蒸発器8において冷媒が蒸発することによって庫内空気を冷却している。このとき、庫内蒸発器8の外面(正確には、庫内蒸発器8を形成する配管やフィンの外面)に霜が着くため、設定された時間になると除霜(融霜)を行っている。霜が融けて生じたドレン水は、商品収納室402の排水孔(図示しない)から機械室700に設置されているドレン皿(図示しない)に集められる。ドレン皿には高圧高温冷媒が流れ込む蒸発パイプ3が備えられ、該冷媒の温熱によってドレン水は蒸発している。
Furthermore, the expansion means (for example, electronic expansion valve) 7 which expands the refrigerant cooled by the gas cooler 4 and the inside of the refrigerator which evaporates the refrigerant expanded by the expansion means 7 (hereinafter sometimes referred to as “low-pressure low-temperature refrigerant”). And an evaporator 8. That is, the cooling unit 100 basically circulates the refrigerant so as to return to the compressor 1 after passing through the compressor 1, the gas cooler 4, the expansion means 7, and the internal evaporator 8 in order. Running cycle.
In addition, an internal heat exchanger that exchanges heat between the refrigerant (having warm temperature) just before flowing into the expansion means 7 (more precisely, the capillary tube 6) and the refrigerant (having warm temperature) just before returning to the compressor 1 5 is installed.
The internal air is cooled by evaporating the refrigerant in the internal evaporator 8. At this time, frost forms on the outer surface of the internal evaporator 8 (more precisely, the outer surfaces of the pipes and fins forming the internal evaporator 8), so defrosting (frosting) is performed at a set time. Yes. Drain water generated by melting frost is collected from a drain hole (not shown) of the product storage chamber 402 to a drain pan (not shown) installed in the machine room 700. The drain pan is provided with an evaporation pipe 3 into which high-pressure and high-temperature refrigerant flows, and the drain water is evaporated by the heat of the refrigerant.

各機器を連通する配管と、一部の配管には開閉弁または逆止弁の一方または両方が設置されている。なお、符号Jの機器と符号Kの機器とを連通する配管を「配管JK」と称し、配管JKに設置された開閉弁を「開閉弁JKv」、配管JKに設置された逆止弁を「逆止弁JKn」と称す。たとえば、商品収納室402A、402B、402Cには、それぞれ庫内熱交換器440A、440B、440Cとして庫内蒸発器8A、8B、8Cが設置されている。そして、膨張手段7と庫内蒸発器8Aとを連通する配管78Aには、開閉弁78Avが設置され、膨張手段7と庫内蒸発器8B、8Cとを連通する配管78B、78Cには、開閉弁78Bv、78Cvと逆止弁78Bn、78Cnとが設置されている。また、配管78B、78Cの庫内蒸発器8B、8Cに近い位置に、それぞれ吐出温度センサ9B、9Cが設置されている。   One or both of an on-off valve and a check valve are installed in a pipe that communicates each device and a part of the pipe. The pipe that communicates the device with the symbol J and the device with the symbol K is referred to as “pipe JK”. This is referred to as “check valve JKn”. For example, in-product evaporators 8A, 8B, and 8C are installed in the product storage chambers 402A, 402B, and 402C as the internal heat exchangers 440A, 440B, and 440C, respectively. An opening / closing valve 78Av is installed in the pipe 78A that connects the expansion means 7 and the internal evaporator 8A, and the pipes 78B and 78C that connect the expansion means 7 and the internal evaporators 8B and 8C are opened and closed. Valves 78Bv and 78Cv and check valves 78Bn and 78Cn are provided. Discharge temperature sensors 9B and 9C are installed at positions near the internal evaporators 8B and 8C of the pipes 78B and 78C, respectively.

また、中間熱交換器2には、これをバイパスするバイパス配管22(バイパス開閉弁22vが設置されている)が設置されている。また、内部熱交換器5は、配管47の一部である配管5aと、配管81の一部である配管5bとから形成され、配管5aと配管5bとは伝熱自在に(たとえば、当接、または個体伝熱媒体あるいは液体伝熱媒体を介して)配置されている。
なお、蒸発パイプ3として高圧高温冷媒が流れ込むもの、すなわち、配管14の一部かとみなせるものを例示しているが、本発明はこれに限定するものではなく、配管14と電熱自在に連結された部材であってもよい。
Further, the intermediate heat exchanger 2 is provided with a bypass pipe 22 (a bypass opening / closing valve 22v is installed) that bypasses the intermediate heat exchanger 2. The internal heat exchanger 5 is formed of a pipe 5a that is a part of the pipe 47 and a pipe 5b that is a part of the pipe 81, and the pipe 5a and the pipe 5b are capable of heat transfer (for example, abutment). Or via a solid or liquid heat transfer medium).
The evaporating pipe 3 is exemplified as one in which high-pressure and high-temperature refrigerant flows, that is, one that can be regarded as a part of the pipe 14, but the present invention is not limited to this, and the pipe 14 is connected to the pipe 14 so as to be electrically heated. It may be a member.

(冷媒の循環径路例−1)
図示しない制御手段は、運転モードに応じて、各開閉弁を開閉すると共に、後記するように圧縮機1の運転周波数を変更するものである。
図3は本発明の実施の形態に係る自動販売機に設置された冷却ユニットにおける冷媒の循環径路を説明する模式図であって、商品収納室402Aが冷却運転をし、商品収納室402B、402Cが加熱運転をしている場合に、商品収納室402Aが適温に達して冷却運転を休止しているモード(HHモード)を示している。
このとき、冷媒(高圧高温冷媒)は蒸発パイプ3を経由した後、庫内蒸発器8B、8Cに直接流入して、商品収納室402B、402Cを加熱している。そして、庫内蒸発器8B、8Cから流出して冷媒は、ガスクーラ4および内部熱交換器5を経由して膨張手段7に流入し、膨張手段7において膨張する(低圧低温冷媒になる)。その後、低圧低温冷媒は中間熱交換器2において放熱し、内部熱交換器5を経由して圧縮機1に戻っている。
(Refrigerant circulation path example-1)
The control means (not shown) opens and closes each on-off valve according to the operation mode, and changes the operation frequency of the compressor 1 as will be described later.
FIG. 3 is a schematic diagram for explaining the refrigerant circulation path in the cooling unit installed in the vending machine according to the embodiment of the present invention. The product storage chamber 402A performs the cooling operation, and the product storage chambers 402B and 402C. Shows a mode (HH mode) in which the product storage chamber 402A reaches an appropriate temperature and the cooling operation is stopped when the heating operation is performed.
At this time, the refrigerant (high-pressure and high-temperature refrigerant) passes through the evaporation pipe 3 and then directly flows into the internal evaporators 8B and 8C to heat the product storage chambers 402B and 402C. The refrigerant flowing out of the internal evaporators 8B and 8C flows into the expansion means 7 via the gas cooler 4 and the internal heat exchanger 5, and expands in the expansion means 7 (becomes a low-pressure low-temperature refrigerant). Thereafter, the low-pressure low-temperature refrigerant radiates heat in the intermediate heat exchanger 2 and returns to the compressor 1 via the internal heat exchanger 5.

(冷媒の循環径路例−2)
図4は本発明の実施の形態に係る自動販売機に設置された冷却ユニットにおける冷媒の循環径路を説明する模式図であって、HHモードを示している。前記冷媒の循環径路例−1は、庫内蒸発器8B、8Cから流出して冷媒は、ガスクーラ4および内部熱交換器5を経由して膨張手段7に流入しているのに対し、冷媒の循環径路例−2は、ガスクーラ4を経由しないで、内部熱交換器5に直接流入している。
(Refrigerant circulation path example-2)
FIG. 4 is a schematic view for explaining the refrigerant circulation path in the cooling unit installed in the vending machine according to the embodiment of the present invention, and shows the HH mode. The refrigerant circulation path example-1 flows out of the internal evaporators 8B and 8C, and the refrigerant flows into the expansion means 7 via the gas cooler 4 and the internal heat exchanger 5, whereas the refrigerant circulation path example-1 The circulation path example-2 directly flows into the internal heat exchanger 5 without passing through the gas cooler 4.

(冷媒の循環径路例−3)
図5は本発明の実施の形態に係る自動販売機に設置された冷却ユニットにおける冷媒の循環径路を説明する模式図であって、(a)はCHHモード、(b)はHHモードを示している。図5の(a)において、冷媒(高圧高温冷媒)は蒸発パイプ3を経由した後、庫内蒸発器8B、8Cに直接流入して、商品収納室402B、402Cを加熱している。そして、庫内蒸発器8B、8Cから流出して冷媒は、ガスクーラ4および内部熱交換器5を経由して膨張手段7に流入し、膨張手段7おいて膨張する(低圧低温冷媒になる)。その後、低圧低温冷媒は庫内蒸発器8Aに流入して、商品収納室402Aを冷却した後、内部熱交換器5を経由して圧縮機1に戻っている。
なお、冷媒の循環径路例−2に準じ庫内蒸発器8B、8Cから流出して冷媒は、ガスクーラ4を経由しないで、内部熱交換器5に直接流入してもよい。
(Refrigerant circulation path example-3)
FIG. 5 is a schematic diagram for explaining the refrigerant circulation path in the cooling unit installed in the vending machine according to the embodiment of the present invention, where (a) shows the CHH mode and (b) shows the HH mode. Yes. In FIG. 5A, the refrigerant (high-pressure and high-temperature refrigerant) passes through the evaporation pipe 3 and then directly flows into the internal evaporators 8B and 8C to heat the product storage chambers 402B and 402C. The refrigerant flowing out of the internal evaporators 8B and 8C flows into the expansion means 7 via the gas cooler 4 and the internal heat exchanger 5, and expands in the expansion means 7 (becomes a low-pressure low-temperature refrigerant). Thereafter, the low-pressure low-temperature refrigerant flows into the internal evaporator 8A, cools the product storage chamber 402A, and then returns to the compressor 1 via the internal heat exchanger 5.
The refrigerant flowing out of the internal evaporators 8B and 8C according to the refrigerant circulation path example-2 may directly flow into the internal heat exchanger 5 without passing through the gas cooler 4.

(制御手段)
図6〜図10は本発明の実施の形態に係る自動販売機に設置された制御手段を説明するものであって、図6構成を示すブロック図、図7は圧縮機の運転周波数線図、図8は圧縮機の運転周波数制御の効果を示す吐出温度曲線、図9は庫内ファンの風量線図、図10は制御フロー図である。
図示しない制御手段の中央演算部(図示しない、以下「CPU」と称す)900には、吐出温度センサ9の測定した吐出温度が入力され、これに基づいて、庫内ファン430、ガスクーラ用ファン600、各開閉弁、圧縮機1(正確には圧縮機インバータ等)に対して所定の制御信号が出力される。
(Control means)
6 to 10 are diagrams for explaining the control means installed in the vending machine according to the embodiment of the present invention. FIG. 6 is a block diagram showing the configuration of FIG. 6, and FIG. 7 is an operating frequency diagram of the compressor. FIG. 8 is a discharge temperature curve showing the effect of compressor operating frequency control, FIG. 9 is an air flow diagram of the internal fan, and FIG. 10 is a control flow diagram.
A discharge temperature measured by the discharge temperature sensor 9 is input to a central processing unit (not shown, hereinafter referred to as “CPU”) 900 of a control means (not shown). Based on this, the internal fan 430 and the gas cooler fan 600 are input. A predetermined control signal is output to each on-off valve and the compressor 1 (more precisely, a compressor inverter or the like).

(圧縮機の運転周波数制御)
たとえば、圧縮機1に対しては、前記測定した吐出温度が所定の温度に到達するまでは、高い運転周波数(たとえば、70Hz)を指令し、所定の温度を超えると、低い運転周波数(たとえば、50Hz)を指令している(図7参照)。これにより、運転開始時の吐出温度の立ち上がりが早くなり、圧縮機1やガスクーラ用ファン600の運転時間が短くなるから省エネが奏される。
(Compressor operating frequency control)
For example, for the compressor 1, a high operating frequency (eg, 70 Hz) is commanded until the measured discharge temperature reaches a predetermined temperature, and when the measured temperature exceeds the predetermined temperature, a low operating frequency (eg, 50 Hz) (see FIG. 7). Thereby, the rise of the discharge temperature at the start of operation is accelerated, and the operation time of the compressor 1 and the gas cooler fan 600 is shortened, so that energy is saved.

図8の(a)において、従来技術は圧縮機1を立ち上がりから一定の低い運転周波数(50Hz)で運転するものであって、庫内温度が60℃に到達すると、一旦運転を中断する。そして、庫内温度が除々に低下して55℃になったところで、運転を再開している。このとき、吐出温度は、95℃にまで上昇した後、除々に55℃にまで低下している。
一方、本発明の実施例は圧縮機1の立ち上がり直後は高い運転周波数(70Hz)で運転を開始し、吐出温度が110℃にまで上昇したところで低い運転周波数(50Hz)に切り替えている。そして、庫内温度が60℃に到達したところで一旦運転を中断し、その後、庫内温度が除々に低下して55℃になったところで、運転を再開している。
In FIG. 8A, the prior art operates the compressor 1 at a constant low operating frequency (50 Hz) from the start-up, and once the internal temperature reaches 60 ° C., the operation is temporarily interrupted. Then, when the internal temperature gradually decreases to 55 ° C., the operation is resumed. At this time, the discharge temperature rises to 95 ° C. and then gradually drops to 55 ° C.
On the other hand, in the embodiment of the present invention, the operation is started at a high operation frequency (70 Hz) immediately after the compressor 1 starts up, and is switched to a low operation frequency (50 Hz) when the discharge temperature rises to 110 ° C. Then, the operation is temporarily stopped when the internal temperature reaches 60 ° C., and then the operation is resumed when the internal temperature gradually decreases to 55 ° C.

図8の(a)より、実施例は従来技術に比較して、吐出温度の立ち上がりが早く、吐出温度の到達温度も高くなっている。すなわち、実施例では、圧縮機1が運転を中断した直後に庫内蒸発器8の内部に留まっていた冷媒の保有する熱量が大きいため、中断している時間(以下「停止時間」と称す)が長くなっている。
図8の(b)より、実施例である高い運転周波数(たとえば、70Hz)のとき、約4秒間だけ450Wで運転し、その後、約11秒間運転を停止している。一方、図8の(c)に示す従来技術である低い運転周波数(たとえば、50Hz)のとき、約4秒間だけ400Wで運転し、その後、約6秒間だけ運転を停止している。
したがって、運転周波数を上げることにより圧縮機1の消費する単位時間当たりの電力は増加するものの、運転率(全時間に対する実運転時間の割合、全時間に対する「全時間から停止時間を除いた時間」の割合に同じ)が低くなるため、トータルの消費電力量が少なくなる(実施例と従来技術との消費電力量を比較する表1参照)。
As shown in FIG. 8A, the discharge temperature rises faster and the discharge temperature reaches a higher temperature than in the prior art. That is, in the embodiment, since the amount of heat held by the refrigerant that has remained in the internal evaporator 8 immediately after the operation of the compressor 1 is interrupted is large, the suspension time (hereinafter referred to as “stop time”). Is getting longer.
From FIG. 8B, at a high operating frequency (for example, 70 Hz) as an example, the operation is performed at 450 W for only about 4 seconds, and then the operation is stopped for about 11 seconds. On the other hand, at a low operation frequency (for example, 50 Hz), which is the conventional technique shown in FIG. 8C, the operation is performed at 400 W for about 4 seconds, and then the operation is stopped for about 6 seconds.
Therefore, although the electric power per unit time consumed by the compressor 1 increases by increasing the operation frequency, the operation rate (the ratio of the actual operation time to the total time, “time excluding the stop time from the total time”) Therefore, the total power consumption is reduced (see Table 1 for comparing the power consumption between the embodiment and the prior art).

Figure 0005056026
Figure 0005056026
Figure 0005056026
Figure 0005056026

(冷媒循環径路制御)
表2に、冷媒回路の切り替え条件を示している。すなわち、吐出温度が第1設定値(T1)未満では庫内蒸発器8から流出した冷媒(温熱を有している)は、ガスクーラ4をバイパスして内部熱交換器5に直接流入する(図4参照)。一方、吐出温度が第1設定値(T1)と第2設定値(T2)の間では庫内蒸発器8から流出した冷媒は、ガスクーラ4を経由して内部熱交換器5に流入するものと、ガスクーラ4をバイパスして内部熱交換器5に直接流入するものが、併存する(図3参照)。さらに、吐出温度が第2設定値(T2)以上では庫内蒸発器8から流出した冷媒は、ガスクーラ4を経由して内部熱交換器5に流入する(図5の(b)参照)。
よって、膨張手段7(正確には内部熱交換器5)に流入する冷媒の温度が制御されるから、これに伴って、吐出温度(圧縮機1の出口の冷媒温度)が制御されることになる。すなわち、使用する凝縮器(ガスクーラ4)の数が減るので、モリエル線図(図示しない)上では高温側にシフトすることになり、吐出温度が上昇する。
(Refrigerant circulation path control)
Table 2 shows the refrigerant circuit switching conditions. That is, when the discharge temperature is lower than the first set value (T1), the refrigerant (having warm heat) flowing out of the internal evaporator 8 bypasses the gas cooler 4 and directly flows into the internal heat exchanger 5 (FIG. 4). On the other hand, when the discharge temperature is between the first set value (T1) and the second set value (T2), the refrigerant flowing out of the internal evaporator 8 flows into the internal heat exchanger 5 via the gas cooler 4. The one that directly bypasses the gas cooler 4 and flows directly into the internal heat exchanger 5 coexists (see FIG. 3). Further, when the discharge temperature is equal to or higher than the second set value (T2), the refrigerant that has flowed out of the internal evaporator 8 flows into the internal heat exchanger 5 via the gas cooler 4 (see FIG. 5B).
Therefore, since the temperature of the refrigerant flowing into the expansion means 7 (more precisely, the internal heat exchanger 5) is controlled, the discharge temperature (the refrigerant temperature at the outlet of the compressor 1) is controlled accordingly. Become. That is, since the number of condensers (gas cooler 4) to be used decreases, it shifts to the high temperature side on the Mollier diagram (not shown), and the discharge temperature rises.

(庫内ファン制御)
庫内ファン430は、図9に示す線図に基づいて風量が制御されるものである。すなわち、吐出温度が所定の「ファン運転開始温度」に到達するまでは、庫内ファン430を停止して、その後、吐出温度の増加量に比例して庫内ファン430の風量を増加する。
したがって、吐出温度が低い間は、庫内蒸発器8の放熱量が抑えられるから、膨張手段7(正確には内部熱交換器5)に流入する冷媒の温度が制御され、これに伴って、吐出温度(圧縮機1の出口の冷媒温度)の上昇が促進されることになる。
(Cooling fan control)
The internal fan 430 controls the air volume based on the diagram shown in FIG. That is, the internal fan 430 is stopped until the discharge temperature reaches a predetermined “fan operation start temperature”, and then the air volume of the internal fan 430 is increased in proportion to the increase amount of the discharge temperature.
Therefore, while the discharge temperature is low, the amount of heat released from the internal evaporator 8 is suppressed, so the temperature of the refrigerant flowing into the expansion means 7 (more precisely, the internal heat exchanger 5) is controlled. An increase in the discharge temperature (the refrigerant temperature at the outlet of the compressor 1) is promoted.

(制御フロー)
図10は、前記圧縮機の運転周波数制御、冷媒循環径路制御および庫内ファン制御の全てを実行する「トータルの制御フロー」を示している。これによって、圧縮機1の運転開始直後の吐出温度の立ち上がりが早くなり、ガスクーラ用ファン600の運転時間が短くなるため、省エネが図れると共に、吐出温度が過度に上昇することが防止される。
なお、図4に示す冷媒回路を実行する場合、ガスクーラ4には冷媒が流入しないから、ガスクーラ4を冷却するためのガスクーラ用ファン600を停止して、無用な運転による電力を消費を回避する。
(Control flow)
FIG. 10 shows a “total control flow” for executing all of the operation frequency control of the compressor, the refrigerant circulation path control, and the internal fan control. As a result, the rise of the discharge temperature immediately after the start of the operation of the compressor 1 is accelerated and the operation time of the gas cooler fan 600 is shortened, so that energy saving can be achieved and the discharge temperature is prevented from excessively rising.
When the refrigerant circuit shown in FIG. 4 is executed, since no refrigerant flows into the gas cooler 4, the gas cooler fan 600 for cooling the gas cooler 4 is stopped to avoid consuming electric power due to unnecessary operation.

本発明によれば、吐出温度が急速に上昇するから、商品を加熱する各種自動販売機として広く利用することができる。   According to the present invention, since the discharge temperature rises rapidly, it can be widely used as various vending machines for heating products.

本発明の実施の形態に係る自動販売機を説明する正面視の断面図。Sectional drawing of the front view explaining the vending machine which concerns on embodiment of this invention. 本発明の実施の形態に係る自動販売機を説明する側面視の断面図。The sectional view of the side view explaining the vending machine concerning an embodiment of the invention. 図1に示す自動販売機に設置された冷却加熱装置を説明する構成図。The block diagram explaining the cooling heating apparatus installed in the vending machine shown in FIG. 本発明の実施の形態に係る自動販売機に設置された冷却ユニットにおける冷媒の循環径路を説明する模式図。The schematic diagram explaining the circulation path of the refrigerant | coolant in the cooling unit installed in the vending machine which concerns on embodiment of this invention. 本発明の実施の形態に係る自動販売機に設置された冷却ユニットにおける冷媒の循環径路を説明する模式図。The schematic diagram explaining the circulation path of the refrigerant | coolant in the cooling unit installed in the vending machine which concerns on embodiment of this invention. 本発明の実施の形態に係る自動販売機に設置された制御手段の構成を示すブロック図。The block diagram which shows the structure of the control means installed in the vending machine which concerns on embodiment of this invention. 本発明の実施の形態に係る自動販売機に設置された圧縮機の運転周波数線図。The operation frequency diagram of the compressor installed in the vending machine concerning an embodiment of the invention. 本発明の実施の形態に係る自動販売機に設置された圧縮機の運転周波数制御の効果を示す吐出温度曲線。The discharge temperature curve which shows the effect of the operating frequency control of the compressor installed in the vending machine which concerns on embodiment of this invention. 本発明の実施の形態に係る自動販売機に設置された庫内ファンの風量線図。The air volume diagram of the fan in a store | warehouse | chamber installed in the vending machine which concerns on embodiment of this invention. 本発明の実施の形態に係る自動販売機に設置された制御手段の制御フロー図。The control flowchart of the control means installed in the vending machine which concerns on embodiment of this invention.

符号の説明Explanation of symbols

1 圧縮機
2 中間熱交換器
3 蒸発パイプ
4 ガスクーラ
5 内部熱交換器
6 キャピラリーチューブ
7 膨張手段
8 庫内蒸発器
9 吐出温度センサ
100 冷却ユニット
1000 自動販売機
200 筐体
300 断熱材
401 商品収納庫
402 商品収納室
404 商品補充用扉
405 内扉
406 前扉
407 商品収納ラック
408 商品誘導板
409 商品取出し口
410 庫内部品収納室
420 循環ダクト
430 庫内ファン
440 庫内熱交換器
450 送風ダクト
460 風胴
470 コンデンシングユニット
500 庫内温度センサ
600 ガスクーラ用ファン
700 機械室
800 電装品収納室
DESCRIPTION OF SYMBOLS 1 Compressor 2 Intermediate heat exchanger 3 Evaporation pipe 4 Gas cooler 5 Internal heat exchanger 6 Capillary tube 7 Expansion means 8 Evaporator 9 Discharge temperature sensor 100 Cooling unit 1000 Vending machine 200 Case 300 Insulation material 401 Goods storage 402 Commodity storage room 404 Commodity replenishment door 405 Inner door 406 Front door 407 Commodity storage rack 408 Commodity guide plate 409 Commodity take-out port 410 Internal component storage room 420 Circulating duct 430 Internal fan 440 Internal heat exchanger 450 Blower duct 460 Wind tunnel 470 Condensing unit 500 Internal temperature sensor 600 Gas cooler fan 700 Machine room 800 Electrical component storage room

Claims (7)

冷媒を圧縮する二段圧縮機と、冷媒を冷却する中間熱交換器およびガスクーラと、冷媒を膨張する膨張手段と、冷媒を蒸発させる複数の庫内蒸発器と、を具備する冷却ユニットと、
筐体内に設置された仕切板によって仕切られ、前記複数の庫内蒸発器がそれぞれ設置された複数の商品収納庫と、
運転モードに応じて前記複数の庫内蒸発器のそれぞれに、冷媒の供給開始または供給停止を制御する制御手段と、を有す自動販売機であって、
前記制御手段が、冷媒を前記二段圧縮機から前記複数の庫内蒸発器のうちの一方の庫内蒸発器に直接供給した後、前記膨張手段および前記中間熱交換器を経由して前記二段圧縮機に戻す運転モードを実行させるとき、前記二段圧縮機によって圧縮された冷媒の温度に基づいて、前記二段圧縮機の運転周波数を変更することを特徴とする自動販売機。
A cooling unit comprising: a two-stage compressor that compresses the refrigerant; an intermediate heat exchanger and a gas cooler that cools the refrigerant; an expansion means that expands the refrigerant; and a plurality of internal evaporators that evaporate the refrigerant;
A plurality of product storage compartments partitioned by a partition plate installed in the housing, and each of the plurality of internal evaporators installed;
A vending machine having control means for controlling supply start or supply stop of the refrigerant in each of the plurality of internal evaporators according to an operation mode,
The control means directly supplies the refrigerant from the two-stage compressor to one of the plurality of internal evaporators, and then passes the second refrigerant via the expansion means and the intermediate heat exchanger. An automatic vending machine characterized in that when the operation mode for returning to the stage compressor is executed, the operating frequency of the two stage compressor is changed based on the temperature of the refrigerant compressed by the two stage compressor.
冷媒を圧縮する二段圧縮機と、冷媒を冷却する中間熱交換器およびガスクーラと、冷媒を膨張する膨張手段と、冷媒を蒸発させる複数の庫内蒸発器と、を具備する冷却ユニットと、
筐体内に設置された仕切板によって仕切られ、前記複数の庫内蒸発器がそれぞれ設置された複数の商品収納庫と、
運転モードに応じて前記複数の庫内蒸発器のそれぞれに、冷媒の供給開始または供給停止を制御する制御手段と、を有す自動販売機であって、
前記制御手段が、冷媒を前記二段圧縮機から前記複数の庫内蒸発器のうちの一方の庫内蒸発器に直接供給した後、前記膨張手段および前記複数の庫内蒸発器のうちの他方の庫内蒸発器を経由して前記二段圧縮機に戻す運転モードを実行させるとき、前記二段圧縮機によって圧縮された冷媒の温度に基づいて、前記二段圧縮機の運転周波数を変更することを特徴とする自動販売機。
A cooling unit comprising: a two-stage compressor that compresses the refrigerant; an intermediate heat exchanger and a gas cooler that cools the refrigerant; an expansion means that expands the refrigerant; and a plurality of internal evaporators that evaporate the refrigerant;
A plurality of product storage compartments partitioned by a partition plate installed in the housing, and each of the plurality of internal evaporators installed;
A vending machine having control means for controlling supply start or supply stop of the refrigerant in each of the plurality of internal evaporators according to an operation mode,
After the control means directly supplies the refrigerant from the two-stage compressor to one of the plurality of internal evaporators, the other of the expansion means and the plurality of internal evaporators When the operation mode for returning to the two-stage compressor via the internal evaporator is executed, the operation frequency of the two-stage compressor is changed based on the temperature of the refrigerant compressed by the two-stage compressor. Vending machine characterized by that.
前記制御手段が、冷媒を前記二段圧縮機から前記複数の庫内蒸発器のうちの一方の庫内蒸発器に直接供給した後、前記ガスクーラを経由して前記膨張手段に供給することを特徴とする請求項1または2記載の自動販売機。   The control unit supplies the refrigerant directly from the two-stage compressor to one of the plurality of internal evaporators, and then supplies the refrigerant to the expansion unit via the gas cooler. The vending machine according to claim 1 or 2. 前記制御手段が、前記二段圧縮機によって圧縮された冷媒の温度が所定の温度に到達するまで、前記二段圧縮機を所定の周波数で運転し、前記二段圧縮機によって圧縮された冷媒の温度が所定の温度に到達した後は、前記二段圧縮機を前記所定の周波数よりも低い周波数で運転することを特徴とする請求項1乃至3の何れかに記載の自動販売機。   The control means operates the two-stage compressor at a predetermined frequency until the temperature of the refrigerant compressed by the two-stage compressor reaches a predetermined temperature, and the refrigerant compressed by the two-stage compressor. The vending machine according to any one of claims 1 to 3, wherein the two-stage compressor is operated at a frequency lower than the predetermined frequency after the temperature reaches a predetermined temperature. 前記二段圧縮機によって圧縮された冷媒の温度が、前記冷媒が供給される庫内蒸発器の入口に接続された配管の温度であることを特徴とする請求項1乃至4の何れかに記載の自動販売機。   The temperature of the refrigerant compressed by the two-stage compressor is a temperature of a pipe connected to an inlet of an internal evaporator to which the refrigerant is supplied. Vending machine. 前記膨張手段に流入する前の冷媒と、前記中間熱交換器から流出した後の冷媒との間で熱交換をする内部熱交換器を有することを特徴とする請求項1記載の自動販売機。   The vending machine according to claim 1, further comprising an internal heat exchanger for exchanging heat between the refrigerant before flowing into the expansion means and the refrigerant after flowing out from the intermediate heat exchanger. 前記膨張手段に流入する前の冷媒と、前記複数の庫内蒸発器のうちの他方の庫内蒸発器から流出した後の冷媒との間で熱交換をする内部熱交換器を有することを特徴とする請求項2記載の自動販売機。   It has an internal heat exchanger which performs heat exchange between the refrigerant before flowing into the expansion means and the refrigerant after flowing out from the other internal evaporator of the plurality of internal evaporators. The vending machine according to claim 2.
JP2007013952A 2007-01-24 2007-01-24 vending machine Expired - Fee Related JP5056026B2 (en)

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