JP3213147B2 - Refrigerant circulation circuit for ice machines, etc. - Google Patents

Refrigerant circulation circuit for ice machines, etc.

Info

Publication number
JP3213147B2
JP3213147B2 JP32116493A JP32116493A JP3213147B2 JP 3213147 B2 JP3213147 B2 JP 3213147B2 JP 32116493 A JP32116493 A JP 32116493A JP 32116493 A JP32116493 A JP 32116493A JP 3213147 B2 JP3213147 B2 JP 3213147B2
Authority
JP
Japan
Prior art keywords
refrigerant
hot gas
compressor
solenoid valve
circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP32116493A
Other languages
Japanese (ja)
Other versions
JPH07151427A (en
Inventor
明彦 平野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hoshizaki Electric Co Ltd
Original Assignee
Hoshizaki Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hoshizaki Electric Co Ltd filed Critical Hoshizaki Electric Co Ltd
Priority to JP32116493A priority Critical patent/JP3213147B2/en
Publication of JPH07151427A publication Critical patent/JPH07151427A/en
Application granted granted Critical
Publication of JP3213147B2 publication Critical patent/JP3213147B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Devices That Are Associated With Refrigeration Equipment (AREA)
  • Production, Working, Storing, Or Distribution Of Ice (AREA)

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【産業上の利用分野】この発明は、圧縮機からの高圧・
高温の気化冷媒を蒸発器に流して、製氷板等に成長した
氷を除去するに際し、圧縮機の冷媒出口側での圧力を必
要に応じて減ずることにより、該圧縮機の能力低下およ
び故障の発生を未然に防止し得るよう構成した製氷機等
の冷媒循環回路に関するものである。
BACKGROUND OF THE INVENTION The present invention relates to a high pressure compressor from a compressor.
When the high-temperature vaporized refrigerant flows into the evaporator to remove the ice that has grown on the ice making plate or the like, the pressure at the refrigerant outlet side of the compressor is reduced as necessary, thereby reducing the performance of the compressor and causing failure. The present invention relates to a refrigerant circuit of an ice maker or the like configured to prevent the occurrence thereof beforehand.

【0002】[0002]

【従来技術】多数の氷塊を自動的に製造する製氷機で
は、冷媒を循環させる冷凍回路を備え、製氷運転から除
氷運転に切換わると、圧縮機から得られる高圧・高温の
気化冷媒(以下「ホットガス」ともいう)を製氷板に付帯さ
せた蒸発器に供給することにより、該製氷板を加熱して
氷の離脱を促進させるようになっている。例えば図3
は、垂直に立設した製氷板に製氷水を散布供給して氷塊
を連続的に製造する流下式製氷機を示すものであって、
垂直に配置した2枚の製氷板10,10の間に、図4に
示す冷凍回路12から導出して横方向に蛇行する蒸発器
14が密着固定され、製氷運転時に冷媒を循環させて製
氷板10,10を強制冷却する。各製氷板10の製氷面
側には、幅方向に複数の突条10aが形成され、隣り合
う突条10a,10aの間における蒸発器14と対応す
る位置に氷塊16を生成するようになっている。また製
氷板10,10の直下には、複数の通孔18aを穿設し
た集水板18が傾斜配設され、製氷運転に際し製氷板1
0,10に供給されて氷結するに至らなかった製氷水
は、前記通孔18aを介して、下方に位置する製氷水タ
ンク20に回収貯留される。なお集水板18は、除氷運
転により剥離されて落下する氷塊16を、該集水板18
の斜め下方に配設した貯氷庫22に案内する機能も兼ね
る。
2. Description of the Related Art An ice making machine for automatically producing a large number of ice blocks is provided with a refrigeration circuit for circulating a refrigerant. By supplying the "hot gas" to the evaporator attached to the ice making plate, the ice making plate is heated to accelerate the detachment of the ice. For example, FIG.
Is a falling ice machine for continuously producing ice blocks by spraying and supplying ice making water to a vertically standing ice making plate,
An evaporator 14, which is drawn out of the refrigeration circuit 12 shown in FIG. 4 and meanders in the horizontal direction, is closely fixed between the two vertically arranged ice making plates 10, 10, and circulates a refrigerant during the ice making operation to make the ice making plates. Forcibly cool 10,10. On the ice making surface side of each ice making plate 10, a plurality of ridges 10a are formed in the width direction, and ice blocks 16 are generated at positions corresponding to the evaporator 14 between the adjacent ridges 10a, 10a. I have. Immediately below the ice making plates 10 and 10, a water collecting plate 18 having a plurality of through holes 18a is provided in an inclined manner.
The ice making water that has not been supplied to 0, 10 and has not been frozen is collected and stored in an ice making water tank 20 located below through the through hole 18a. In addition, the water collecting plate 18 holds the ice blocks 16 that have been separated by the deicing operation and fall.
Also serves as a guide to the ice storage 22 arranged diagonally below.

【0003】前記製氷水タンク20から循環ポンプ24
を介して導出した製氷水供給管26は、前記製氷板1
0,10の上方かつ製氷面側に設けた製氷水散布器28
に接続している。この製氷水散布器28には多数の散水
孔(図示せず)が穿設され、製氷運転時にタンク20から
ポンプ圧送される製氷水を、前記散水孔から前記製氷板
10,10の氷結温度にまで冷却されている製氷面に散
布流下させ、該製氷面に所要形状の氷塊16を生成する
ようになっている。
[0003] The circulating pump 24 is
The ice making water supply pipe 26 led out through the ice making plate 1
Ice making water sprayer 28 provided above 0, 10 and on the ice making surface side
Connected to The ice making water sprayer 28 is provided with a large number of water sprinkling holes (not shown), and the ice making water pumped from the tank 20 during the ice making operation is adjusted to the freezing temperature of the ice making plates 10 and 10 from the water sprinkling holes. The ice is sprayed down onto an ice making surface that has been cooled down to form ice blocks 16 of a required shape on the ice making surface.

【0004】図4は、先に述べた自動製氷機に好適に使
用される冷凍回路の概略構成を示すもので、この冷凍回
路12は、フロン等の冷媒を圧縮する圧縮機30と、こ
の圧縮機30で圧縮された高圧・高温の気化冷媒の供給
を受ける凝縮器32と、この凝縮器32で凝縮された液
化冷媒が供給される膨張弁34と、この膨張弁34を経
て膨張気化した冷媒の供給を受ける蒸発器14とを基本
的に備えている。また蒸発器14では、膨張弁34を経
て膨張した気化冷媒との間で熱交換がなされ、該蒸発器
14に付帯した製氷板10,10を氷点下にまで冷却
し、これにより製氷板10,10に流下された製氷水を
次第に氷結させる。そして、該蒸発器14で熱交換され
温度上昇した気化冷媒は、前記圧縮機30に帰還して高
圧・高温に圧縮された後、再循環に供される。なお符号
36は、蒸発器14の冷媒出口側における冷媒温度を検
出する検知手段を示し、この検知手段36により前記膨
張弁34の絞り制御を行なうようになっている。
FIG. 4 shows a schematic configuration of a refrigeration circuit suitably used in the above-described automatic ice maker. The refrigeration circuit 12 includes a compressor 30 for compressing a refrigerant such as Freon and a compressor 30 for compressing the refrigerant. 32, which receives a supply of high-pressure, high-temperature vaporized refrigerant compressed by the compressor 30, an expansion valve 34, to which liquefied refrigerant condensed by the condenser 32 is supplied, and a refrigerant expanded and vaporized through the expansion valve 34 And an evaporator 14 that receives the supply of water. Further, in the evaporator 14, heat is exchanged with the vaporized refrigerant expanded through the expansion valve 34, and the ice making plates 10, 10 attached to the evaporator 14 are cooled to below freezing points, whereby the ice making plates 10, 10 The ice making water flowing down is gradually frozen. Then, the vaporized refrigerant whose temperature has been increased by heat exchange in the evaporator 14 is returned to the compressor 30 to be compressed to a high pressure and a high temperature, and then subjected to recirculation. Reference numeral 36 denotes a detecting means for detecting the refrigerant temperature at the refrigerant outlet side of the evaporator 14, and the detecting means 36 controls the throttle of the expansion valve 34.

【0005】更に圧縮機30の出口側の管体37から分
岐した管体38は、電磁弁等からなるホットガス弁40
を介して前記蒸発器14の入口側に接続して、所謂ホッ
トガス回路42を形成している。そしてホットガス弁4
0は、製氷運転中には閉成してホットガス回路42での
冷媒の循環を阻止して、前記冷凍回路12にのみ冷媒を
循環させている。また製氷板10,10での製氷運転が
終了し、氷を落下除去させる除氷運転に移行すると、ホ
ットガス弁40が開放してホットガス回路42に高温の
冷媒(ホットガス)を循環させる。これにより蒸発器14
に付帯する製氷板10,10は加熱され、該製氷板10,
10に形成された氷塊16の付着を解除して自重落下さ
せるに至る。
A pipe 38 branched from a pipe 37 on the outlet side of the compressor 30 is provided with a hot gas valve 40 such as an electromagnetic valve.
Is connected to the inlet side of the evaporator 14 via a so-called hot gas circuit 42. And hot gas valve 4
Numeral 0 indicates that the refrigerant is closed during the ice making operation to prevent the circulation of the refrigerant in the hot gas circuit 42, and the refrigerant is circulated only in the refrigeration circuit 12. When the ice making operation on the ice making plates 10 and 10 is completed and the operation shifts to a deicing operation for dropping and removing ice, the hot gas valve 40 is opened to circulate a high-temperature refrigerant (hot gas) through the hot gas circuit 42. Thereby, the evaporator 14
The ice making plates 10, 10 accompanying the ice making plates 10 and 10 are heated,
The adhesion of the ice block 16 formed on the base 10 is released, and the ice block 16 is dropped by its own weight.

【0006】[0006]

【発明が解決しようとする課題】先に述べた如く、製氷
機が除氷運転に移行すると、ホットガス弁40が閉成か
ら開放に切換わり、冷凍回路12での冷媒循環が停止
されると共に、圧縮機30の出口側から高圧・高温の
気化冷媒が蒸発器14に供給される。しかし図4から判
るように、前記凝縮器32の入口側には弁体等の閉成手
段は介在していない。このため、除氷運転時に圧縮機3
0から吐出されるホットガスは、全てがホットガス回路
42に供給される訳ではなく、その内の大部分をなすホ
ットガスだけが該ホットガス回路42を循環するもので
ある。そして、小量ではあるが一部のホットガスは、放
熱が良好な前記凝縮器32に向けて流れ、ここで液化し
て停滞(これを「寝込み」という)することになる。このよ
うにホットガスの一部が、凝縮器32に接続する冷凍回
路12中で寝込むことになると、前記ホットガス回路4
2におけるホットガスの循環量は、時間の経過と共に前
記寝込み量だけ減少する。従って蒸発器14での除氷能
力は次第に低下し、除氷運転に長時間を要する欠点が指
摘される。殊にこのような欠点は、周囲温度が低い場合
に顕著に発現する。なお、凝縮器32の出口側にレシー
バを設ける形式の冷凍回路では、前記ホットガスの寝込
み量が多くなって、更に除氷能力が低下する。
As described above, when the ice making machine shifts to the deicing operation, the hot gas valve 40 is switched from the closed state to the open state, and the refrigerant circulation in the refrigeration circuit 12 is stopped. A high-pressure and high-temperature vaporized refrigerant is supplied to the evaporator 14 from the outlet side of the compressor 30. However, as can be seen from FIG. 4, no closing means such as a valve is interposed on the inlet side of the condenser 32. For this reason, during the deicing operation, the compressor 3
Not all of the hot gas discharged from 0 is supplied to the hot gas circuit 42, and only the hot gas that makes up the majority of the hot gas circulates through the hot gas circuit 42. Then, a small amount, but a part, of the hot gas flows toward the condenser 32, which has good heat radiation, and liquefies here and stagnates (this is referred to as “stagnation”). When a part of the hot gas falls in the refrigeration circuit 12 connected to the condenser 32, the hot gas circuit 4
2, the circulation amount of the hot gas decreases by the stagnation amount over time. Accordingly, the deicing ability of the evaporator 14 gradually decreases, which indicates that a long time is required for the deicing operation. In particular, such drawbacks become noticeable when the ambient temperature is low. In a refrigeration circuit in which a receiver is provided on the outlet side of the condenser 32, the amount of the hot gas stagnation increases, and the deicing ability further decreases.

【0007】前記製氷機では、除氷運転により製氷板1
0,10から氷塊16が落下することにより生ずる該製
氷板10,10の温度上昇をサーモスタット(図示せず)
により検出して、除氷運転から製氷運転に切換えるよう
構成されている。前述した理由によりホットガス回路4
2におけるホットガスの循環量が減少すると、製氷板1
0,10に形成されている氷塊16が一様に落下しなく
なり、前記サーモスタットの配設位置近傍の氷塊16が
早く落下することがある。この場合には、他の個所の氷
塊16が落下していないにも拘らず、除氷運転から製氷
運転に切換わり、二重製氷を招く難点があった。
[0007] In the ice making machine, the ice making plate 1 is operated by deicing operation.
A thermostat (not shown) measures the temperature rise of the ice making plates 10 and 10 caused by the falling of ice blocks 16 from 0 and 10.
To switch the operation from the deicing operation to the ice making operation. Hot gas circuit 4 for the reasons described above
When the circulation amount of hot gas in the ice making plate 2 decreases, the ice making plate 1
The ice blocks 16 formed at 0 and 10 may not fall uniformly, and the ice blocks 16 near the thermostat arrangement position may fall quickly. In this case, although the ice block 16 in other places is not dropped, the operation is switched from the deicing operation to the ice making operation, and there is a problem that double ice making is caused.

【0008】前述した問題に対処する手段として、図5
に示す如く、前記圧縮機30と凝縮器32とを接続する
前記管体37における管体38との接続位置より冷媒の
流れ方向下流側(凝縮器32側)に、製氷機が除氷運転に
移行した際に閉成する電磁弁44を介挿することが提案
されている。すなわち、製氷運転中には電磁弁44を開
放して前記冷凍回路12に冷媒を循環させると共に、ホ
ットガス弁40を閉成してホットガス回路42での冷媒
の循環を阻止する。また製氷運転から除氷運転に移行す
ると、電磁弁44を閉成して前記冷凍回路12での冷媒
の循環を阻止すると共に、ホットガス弁40を開放して
ホットガス回路42に高温の冷媒(ホットガス)を循環さ
せる。これにより除氷運転時に圧縮機30から吐出され
るホットガスは、その全てがホットガス回路42に供給
され、除氷能力の低下を防止して、除氷運転に要する時
間を短縮し得る。
As a means for addressing the above-mentioned problem, FIG.
As shown in the figure, the ice making machine performs the de-icing operation on the downstream side (condenser 32 side) in the flow direction of the refrigerant from the connection position of the pipe body 37 in the pipe body 37 connecting the compressor 30 and the condenser 32. It has been proposed to interpose a solenoid valve 44 that closes when the transition occurs. That is, during the ice making operation, the electromagnetic valve 44 is opened to circulate the refrigerant through the refrigeration circuit 12, and the hot gas valve 40 is closed to prevent the refrigerant from circulating in the hot gas circuit 42. When the operation shifts from the ice making operation to the deicing operation, the electromagnetic valve 44 is closed to prevent the circulation of the refrigerant in the refrigeration circuit 12, and the hot gas valve 40 is opened to allow the hot gas circuit 42 Hot gas). As a result, all of the hot gas discharged from the compressor 30 during the deicing operation is supplied to the hot gas circuit 42 to prevent a decrease in the deicing ability, thereby shortening the time required for the deicing operation.

【0009】しかし、前述したように製氷機が除氷運転
に移行した際に前記電磁弁44を閉成し、そのままの状
態で除氷運転を継続すると、前記圧縮機30の出口側で
の圧力が大きく増大することがある。この場合は、圧縮
機30に負荷が加わって能力低下を招くと共に、焼損ま
たは破損等の事故が発生するおそれがあった。
However, as described above, when the ice making machine shifts to the de-icing operation, the solenoid valve 44 is closed, and if the de-icing operation is continued as it is, the pressure at the outlet side of the compressor 30 is reduced. May greatly increase. In this case, a load may be applied to the compressor 30 to lower the capacity, and an accident such as burnout or breakage may occur.

【0010】[0010]

【発明の目的】この発明は、前述した従来技術に係る製
氷機等の冷媒循環回路に内在している欠点に鑑み、これ
を好適に解決するべく提案されたものであって、蒸発器
に高温の気化冷媒(ホットガス)を流して、製氷板等に成
長した氷を除去するに際し、圧縮機の能力低下や焼損等
の発生を未然に防止し得る手段を提供することを目的と
する。
SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned drawbacks inherent in a refrigerant circuit of an ice maker and the like according to the prior art, and has been proposed in order to preferably solve the problem. It is an object of the present invention to provide means capable of preventing a decrease in the capacity of a compressor or the occurrence of burnout when removing ice grown on an ice making plate or the like by flowing a vaporized refrigerant (hot gas).

【0011】[0011]

【課題を解決するための手段】前述した問題点を解決
し、所期の目的を好適に達成するため、本発明に係る製
氷機等の冷媒循環回路は、圧縮機で圧縮された高圧・高
温の気化冷媒を電磁弁を介して凝縮器に供給し、この凝
縮器で凝縮された液化冷媒を膨張手段に供給し、この膨
張手段を経て膨張気化した冷媒を蒸発器に供給し、この
蒸発器で熱交換して温度上昇した気化冷媒を前記圧縮機
に帰還させる冷凍回路と、前記圧縮機からの高圧・高温
の気化冷媒を、ホットガス弁を介して前記蒸発器に分岐
供給して、該蒸発器での除氷等を行なうホットガス回路
とを備え、冷凍運転時には前記電磁弁を開放すると共に
ホットガス弁を閉成し、除氷等運転に移行した際にホッ
トガス弁を開放し電磁弁を閉成するようにした製氷機等
において、前記圧縮機と電磁弁との間に、前記電磁弁の
除氷等運転時の開閉制御を行なう圧力検知手段を介挿
し、 前記凝縮器の出口側に、周囲温度の低温を検出した
場合にのみ、除氷運転に移行した際に前記電磁弁を閉成
する制御を行なう感温手段を配設し、 周囲温度が低温時
の除氷運転に際し、該除氷運転に移行してから所定時間
経過した後に前記電磁弁を開放するよう制御するタイマ
を制御回路に設けたことを特徴とする。
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems and to appropriately achieve the intended purpose, a refrigerant circuit of an ice making machine or the like according to the present invention comprises a high-pressure / high-temperature compressor compressed by a compressor. Is supplied to the condenser through the solenoid valve, the liquefied refrigerant condensed by the condenser is supplied to the expansion means, and the refrigerant expanded and vaporized through the expansion means is supplied to the evaporator. A refrigeration circuit for returning the vaporized refrigerant whose temperature has increased due to heat exchange to the compressor, and a high-pressure, high-temperature vaporized refrigerant from the compressor, which is branched and supplied to the evaporator via a hot gas valve, A hot gas circuit for performing de-icing in the evaporator; and opening the solenoid valve and closing the hot gas valve during the freezing operation, and opening the hot gas valve when the operation shifts to de-icing operation. In an ice maker or the like in which a valve is closed, the compression Interposed and between the electromagnetic valve, a pressure sensing means for opening and closing control during deicing like operation prior SL solenoid valve
Then, on the outlet side of the condenser, a low ambient temperature was detected.
The solenoid valve is closed only when shifting to deicing operation.
Temperature sensing means for controlling the ambient temperature is low.
A predetermined time after shifting to the deicing operation.
A timer for controlling the solenoid valve to open after a lapse of time
Is provided in the control circuit .

【0012】[0012]

【実施例】次に、本発明に係る製氷機等の冷媒循環回路
につき、好適な実施例を挙げて、添付図面を参照しなが
ら以下説明する。なお、図5に関する冷凍回路およびホ
ットガス回路で、既に説明した部材と同一の部材に関し
ては、同じ符号で指示だけするものとする。図1は、本
発明の好適例に係る冷媒循環回路を示すものであって、
図3に関して述べた流下式製氷機に使用されるが、ホッ
トガスを使用して蒸発器での除霜を行なう冷凍機一般に
も使用し得る。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a preferred embodiment of a refrigerant circuit of an ice maker and the like according to the present invention will be described with reference to the accompanying drawings. In the refrigeration circuit and the hot gas circuit shown in FIG. 5, the same members as those already described are designated by the same reference numerals. FIG. 1 shows a refrigerant circuit according to a preferred embodiment of the present invention,
Although used in the flow-down ice maker described with reference to FIG. 3, it can also be used in general refrigerators that use hot gas to perform defrosting in an evaporator.

【0013】図1に示す冷媒循環回路は、図5に関して
述べた冷媒循環回路と基本的に同一であって、圧縮機3
0と電磁弁44との間に圧力スイッチ46を設けた点で
相違している。すなわち実施例に係る冷媒循環回路で
は、圧縮機30の出口側の管体37とホットガス回路4
2の管体38との接続部Cより冷媒の流れ方向上流側
(圧縮機30側)に、圧力スイッチ46が介挿されてい
る。この圧力スイッチ46は、製氷機が除氷運転に移行
して電磁弁44を閉成することにより圧縮機30から吐
出される高圧・高温の冷媒がホットガス回路42に循環
している状態で、圧縮機30の出口側の圧力が予め設定
された圧力以上となったことを検出すると、前記電磁弁
44を開放する制御を行なうようになっている。なお圧
力スイッチ46の設定圧力は、圧縮機30での効率的な
運転に支障を来たすことがない値に設定される。
The refrigerant circuit shown in FIG. 1 is basically the same as the refrigerant circuit described with reference to FIG.
The difference is that a pressure switch 46 is provided between the solenoid valve 44 and the solenoid valve 44. That is, in the refrigerant circulation circuit according to the embodiment, the pipe 37 on the outlet side of the compressor 30 and the hot gas circuit 4
Upstream of the connection part C with the second pipe 38 in the flow direction of the refrigerant
The pressure switch 46 is interposed on the (compressor 30 side). This pressure switch 46 is in a state where the high-pressure and high-temperature refrigerant discharged from the compressor 30 is circulated to the hot gas circuit 42 by closing the electromagnetic valve 44 by the ice making machine shifting to the de-icing operation, When it is detected that the pressure on the outlet side of the compressor 30 has become equal to or higher than a preset pressure, control for opening the solenoid valve 44 is performed. The set pressure of the pressure switch 46 is set to a value that does not hinder efficient operation of the compressor 30.

【0014】すなわち前記冷媒循環回路では、製氷運転
から除氷運転に移行すると、ホットガス弁40を開放し
電磁弁44を閉成して前記冷凍回路12での冷媒の循環
を阻止し、ホットガス回路42にホットガスを循環させ
る。これにより前記蒸発器14に付帯する製氷板10,
10は加熱され、該製氷板10,10に形成された氷塊
16の付着を解除して自重落下させるに至る。なお、除
氷運転時に圧縮機30から吐出されるホットガスは、そ
の全てがホットガス回路42に供給されるので、前述し
た如き冷凍回路12での「寝込み」を生ずることはない。
また除氷能力の低下を防止し、除氷運転に要する時間を
短縮すると共に確実な除氷を行ない得る。
That is, in the refrigerant circulation circuit, when the operation shifts from the ice making operation to the deicing operation, the hot gas valve 40 is opened and the electromagnetic valve 44 is closed to prevent the refrigerant from circulating in the refrigeration circuit 12 and the hot gas The hot gas is circulated through the circuit 42. Thereby, the ice making plate 10 attached to the evaporator 14,
10 is heated, the ice blocks 16 formed on the ice making plates 10 and 10 are released, and the ice blocks 16 are dropped by their own weight. It should be noted that the hot gas discharged from the compressor 30 during the deicing operation is entirely supplied to the hot gas circuit 42, and thus does not cause “stagnation” in the refrigeration circuit 12 as described above.
Further, it is possible to prevent a decrease in the deicing ability, shorten the time required for the deicing operation, and perform reliable deicing.

【0015】前述した除氷運転が開始された以後に、前
記圧力スイッチ46が予め設定されている圧力を検出す
ると、前記電磁弁44を開放する。これにより、圧縮機
30から吐出されるホットガスの一部が冷凍回路12に
流れ、圧縮機30の出口側での圧力が低下する。この結
果、圧縮機30の過負荷による能力低下や焼損および破
損等の事故の発生を未然に防止することができる。な
お、冷凍回路12へのホットガスの流入により圧縮機3
0の出口側の圧力が低下すると、これを圧力スイッチ4
6が検出して電磁弁44を閉成し、除氷能力が低下する
のを防止するようになっている。
When the pressure switch 46 detects a preset pressure after the deicing operation is started, the solenoid valve 44 is opened. As a result, part of the hot gas discharged from the compressor 30 flows into the refrigeration circuit 12, and the pressure at the outlet side of the compressor 30 decreases. As a result, it is possible to prevent the occurrence of accidents such as a reduction in capacity due to overload of the compressor 30 and burning or breakage of the compressor 30. The flow of the hot gas into the refrigeration circuit 12 causes the compressor 3
When the pressure on the outlet side of “0” drops, the pressure switch 4
6 detects and closes the electromagnetic valve 44 to prevent the deicing ability from lowering.

【0016】ここで、夏季の如く外気温が高い場合は、
余り大きい除氷能力は必要とせず、逆に外気温が低い場
合は、除氷能力に不足を来すことが多い。従って、周囲
温度が高い時(高温時)は、除氷運転中であっても電磁弁
44は開放しておき、周囲温度が低い時(低温時)は、除
氷運転中に電磁弁44を閉成する制御により、高温時お
よび低温時の何れの場合にも効率的な除氷を行なうこと
ができる。そこで、図2に示すように、凝縮器32の出
口側にサーモスタットの如き感温手段48を配設し、該
感温手段48が低温を検出した場合にのみ、除氷運転に
移行した際に前記電磁弁44を閉成する制御を行なうよ
うにすることが推奨される。なお、凝縮器32の高圧圧
力を検出することにより、除氷運転に移行した際の電磁
弁44の開閉を制御するようにしてもよい。
Here, when the outside temperature is high as in summer,
A very large deicing capacity is not required. Conversely, when the outside air temperature is low, the deicing capacity is often insufficient. Therefore, when the ambient temperature is high (high temperature), the solenoid valve 44 is opened even during the deicing operation, and when the ambient temperature is low (low temperature), the solenoid valve 44 is opened during the deicing operation. By performing the closing control, efficient deicing can be performed at both high and low temperatures. Therefore, as shown in FIG. 2, a temperature sensing means 48 such as a thermostat is provided on the outlet side of the condenser 32, and only when the temperature sensing means 48 detects a low temperature, the operation is shifted to the deicing operation. It is recommended to perform control for closing the solenoid valve 44. The opening and closing of the solenoid valve 44 at the time of shifting to the deicing operation may be controlled by detecting the high pressure of the condenser 32.

【0017】また、除氷運転に際し、初期および中期に
はホットガスを多く循環させ、後期にはホットガスの循
環量を少なくすることにより、周囲温度が低温時におけ
る除氷を良好に行ない得ることが実験や経験から判明し
ている。そこで、例えば制御回路(図示せず)に設けたタ
イマにより、除氷運転に移行してから所定時間経過した
後に電磁弁44を開放するよう制御し、ホットガスの一
部を冷凍回路12に流してホットガス回路42のホット
ガス循環量を減らすようにしてもよい。なお、圧縮機3
0の出口側での圧力の変化に伴って冷媒温度や管体37
の温度が変化するので、前記管体37に温度検知手段を
配設し、該検知手段により温度変化を検出して前記電磁
弁44を開放制御することも可能である。
In the deicing operation, a large amount of hot gas is circulated in the initial and middle stages, and the amount of circulation of the hot gas is reduced in the latter period, so that deicing can be performed satisfactorily when the ambient temperature is low. Is known from experiments and experience. Therefore, for example, a timer provided in a control circuit (not shown) controls the solenoid valve 44 to be opened after a lapse of a predetermined time from the shift to the deicing operation, and allows a part of the hot gas to flow to the refrigeration circuit 12. Thus, the hot gas circulation amount of the hot gas circuit 42 may be reduced. The compressor 3
With the change of the pressure at the outlet side of zero, the refrigerant temperature and the pipe 37
Therefore, it is also possible to dispose a temperature detecting means in the pipe 37 and detect the temperature change by the detecting means to control the opening of the electromagnetic valve 44.

【0018】[0018]

【発明の効果】以上に説明したように、本発明に係る製
氷機等の冷媒循環回路は、圧縮機と電磁弁との間に介挿
した圧力検知手段により、圧縮機の出口側の圧力を検出
して電磁弁を開閉制御するよう構成したものである。す
なわち、除氷運転に際して圧縮機の出口側の圧力が所定
圧力以上になったときには、電磁弁を開放してホットガ
スの一部を冷凍回路に流して圧力を低減させることがで
きる。これにより、除氷運転中に生ずる圧縮機の能力低
下や焼損または破損等の事故の発生を未然に防止し得
る。また、感温手段が周囲温度の低温を検出した場合
に、電磁弁を閉成する制御を行なうことで、周囲温度が
高温時および低温時の何れの場合にも、効率的な除氷を
行なうことができる。更に、周囲温度が低温時における
除氷運転に際しては、該除氷運転に移行してから所定時
間経過した後に電磁弁を開放するようタイマで制御し
て、初期および中期にはホットガスを多く循環させるの
に対して、後期にはホットガスの循環量を少なくするこ
とで、除氷を更に良好に行なうことが可能となる。
As described above, the refrigerant circulation circuit of the ice making machine or the like according to the present invention uses the pressure detecting means inserted between the compressor and the solenoid valve to detect the pressure at the outlet of the compressor. It is configured to detect and control the opening and closing of the solenoid valve. That is, when the pressure on the outlet side of the compressor becomes equal to or higher than the predetermined pressure during the deicing operation, the solenoid valve is opened to allow a part of the hot gas to flow to the refrigeration circuit to reduce the pressure. As a result, it is possible to prevent the occurrence of accidents such as a decrease in the capacity of the compressor, a burnout or a breakage occurring during the deicing operation. Also, if the temperature sensing means detects a low ambient temperature
The ambient temperature is controlled by closing the solenoid valve.
Efficient deicing at both high and low temperatures
Can do it. Furthermore, when the ambient temperature is low,
At the time of deicing operation, at a predetermined time after shifting to the deicing operation
After a time has elapsed, the timer is controlled to open the solenoid valve.
Circulate hot gas in the early and middle stages
In the second half, however, the amount of hot gas circulation should be reduced.
Thus, the deicing can be performed more favorably.

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

【図1】 本発明の好適な実施例に係る冷媒循環回路の
概略構成図である。
FIG. 1 is a schematic configuration diagram of a refrigerant circuit according to a preferred embodiment of the present invention.

【図2】 本発明の別実施例に係る冷媒循環回路の概略
構成図である。
FIG. 2 is a schematic configuration diagram of a refrigerant circuit according to another embodiment of the present invention.

【図3】 垂直に立設した製氷板に製氷水を散布供給し
て氷塊を製造する流下式自動製氷機の概略構成図であ
る。
FIG. 3 is a schematic configuration diagram of a falling-down type automatic ice maker that scatters and supplies ice making water to a vertically erected ice maker to produce ice blocks.

【図4】 図3に示す自動製氷機に好適に使用される従
来技術に係る冷凍回路の概略構成図である。
FIG. 4 is a schematic configuration diagram of a refrigeration circuit according to a conventional technique suitably used for the automatic ice maker shown in FIG.

【図5】 従来技術に係る別の冷凍回路の概略構成図で
ある。
FIG. 5 is a schematic configuration diagram of another refrigeration circuit according to the related art.

【符号の説明】[Explanation of symbols]

12 冷凍回路,14 蒸発器,30 圧縮器,32 凝縮
器,34 膨張弁40 ホットガス弁,42 ホットガス
回路,44 電磁弁,46 圧力スイッチ48 感温手段
12 refrigeration circuit, 14 evaporator, 30 compressor, 32 condenser, 34 expansion valve 40 hot gas valve, 42 hot gas circuit, 44 solenoid valve, 46 pressure switch 48 temperature sensing means

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】 圧縮機(30)で圧縮された高圧・高温の気
化冷媒を電磁弁(44)を介して凝縮器(32)に供給し、この
凝縮器(32)で凝縮された液化冷媒を膨張手段(34)に供給
し、この膨張手段(34)を経て膨張気化した冷媒を蒸発器
(14)に供給し、この蒸発器(14)で熱交換して温度上昇し
た気化冷媒を前記圧縮機(30)に帰還させる冷凍回路(12)
と、 前記圧縮機(30)からの高圧・高温の気化冷媒を、ホット
ガス弁(40)を介して前記蒸発器(14)に分岐供給して、該
蒸発器(14)での除氷等を行なうホットガス回路(42)とを
備え、 冷凍運転時には前記電磁弁(44)を開放すると共にホット
ガス弁(40)を閉成し、除氷等運転に移行した際にホット
ガス弁(40)を開放し電磁弁(44)を閉成するようにした製
氷機等において、 前記圧縮機(30)と電磁弁(44)との間に、前記電磁弁(44)
の除氷等運転時の開閉制御を行なう圧力検知手段(46)
介挿し、 前記凝縮器(32)の出口側に、周囲温度の低温を検出した
場合にのみ、除氷運転に移行した際に前記電磁弁(44)を
閉成する制御を行なう感温手段(48)を配設し、 周囲温度が低温時の除氷運転に際し、該除氷運転に移行
してから所定時間経過した後に前記電磁弁(44)を開放す
るよう制御するタイマを制御回路に設けた ことを特徴と
する製氷機等の冷媒循環回路。
1. A high-pressure and high-temperature vaporized refrigerant compressed by a compressor (30) is supplied to a condenser (32) via an electromagnetic valve (44), and the liquefied refrigerant condensed by the condenser (32) is supplied. Is supplied to the expansion means (34), and the refrigerant expanded and vaporized through the expansion means (34) is evaporated.
(14), a refrigeration circuit (12) for returning the vaporized refrigerant whose temperature has increased by heat exchange in the evaporator (14) to the compressor (30).
The high-pressure and high-temperature vaporized refrigerant from the compressor (30) is branched and supplied to the evaporator (14) via a hot gas valve (40) to remove deicing and the like in the evaporator (14). A hot gas circuit (42) for performing the cooling operation.When the operation is freezing, the solenoid valve (44) is opened and the hot gas valve (40) is closed. ) open solenoid valve (in ice machine or the like so as to close the 44), between the compressor (30) solenoid valve (44), before SL solenoid valve (44)
Pressure detection means for opening and closing control during deicing like operation (46)
Interposed, at the outlet side of the condenser (32), low ambient temperature was detected
Only in this case, the solenoid valve (44) is
A temperature sensing means (48) for controlling closing is provided, and when the ambient temperature is low, the operation shifts to the deicing operation.
After a lapse of a predetermined time, the solenoid valve (44) is opened.
A refrigerant circuit for an ice maker or the like, wherein a timer for controlling the refrigerant circuit is provided in the control circuit.
JP32116493A 1993-11-27 1993-11-27 Refrigerant circulation circuit for ice machines, etc. Expired - Fee Related JP3213147B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP32116493A JP3213147B2 (en) 1993-11-27 1993-11-27 Refrigerant circulation circuit for ice machines, etc.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP32116493A JP3213147B2 (en) 1993-11-27 1993-11-27 Refrigerant circulation circuit for ice machines, etc.

Publications (2)

Publication Number Publication Date
JPH07151427A JPH07151427A (en) 1995-06-16
JP3213147B2 true JP3213147B2 (en) 2001-10-02

Family

ID=18129524

Family Applications (1)

Application Number Title Priority Date Filing Date
JP32116493A Expired - Fee Related JP3213147B2 (en) 1993-11-27 1993-11-27 Refrigerant circulation circuit for ice machines, etc.

Country Status (1)

Country Link
JP (1) JP3213147B2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4954684B2 (en) * 2006-11-27 2012-06-20 ホシザキ電機株式会社 How to operate an automatic ice machine
JP5098472B2 (en) * 2007-07-06 2012-12-12 三浦工業株式会社 Chiller using refrigerator

Also Published As

Publication number Publication date
JPH07151427A (en) 1995-06-16

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