JP3653348B2 - Air conditioner - Google Patents

Air conditioner Download PDF

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JP3653348B2
JP3653348B2 JP22240696A JP22240696A JP3653348B2 JP 3653348 B2 JP3653348 B2 JP 3653348B2 JP 22240696 A JP22240696 A JP 22240696A JP 22240696 A JP22240696 A JP 22240696A JP 3653348 B2 JP3653348 B2 JP 3653348B2
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refrigerant
compressor
heater
pipe
air conditioner
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JPH1062028A (en
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隆治 宮
順一 斉藤
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三洋電機株式会社
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2400/00General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/07Details of compressors or related parts
    • F25B2400/075Details of compressors or related parts with parallel compressors

Description

【0001】 [0001]
【発明の属する技術分野】 BACKGROUND OF THE INVENTION
本発明は、複数の圧縮機と冷媒加熱手段とを備えた空気調和機に係り、詳しくは冷媒加熱運転中における停止側圧縮機やその吸込配管での冷媒の寝込みを解消する技術に関する。 The present invention relates to an air conditioner having a plurality of compressors and the refrigerant heating means, more particularly a technique for eliminating stagnation of the refrigerant in the stop-side compressor and the suction pipe in the refrigerant heating operation.
【0002】 [0002]
【従来の技術】 BACKGROUND OF THE INVENTION
近年、旧来の冷房専用機に代わり、空気を熱源として暖房を行うヒートポンプ型の空気調和機が増加している。 Recently, for replacement of the conventional cooling only machine, the heat pump type air conditioner for performing heating the air as a heat source is increased. ところが、ヒートポンプ型の空気調和機では、外気温が著しく低い場合、室外熱交換器での冷媒の蒸発温度と外気温との差がごく小さく無くなり、暖房が殆ど行えなくなる不具合があった。 However, in the heat pump type air conditioner, when the outside air temperature is extremely low, the difference between the evaporation temperature and the outside temperature of the refrigerant in the outdoor heat exchanger is eliminated very small, heating was a problem that can not be performed almost. そこで、通常の室外熱交換器(空気熱交換器)の他に冷媒加熱器を室外ユニット内に設け、温水等と冷媒との間での熱交換(すなわち、冷媒加熱)を行わせることにより、比較的高温の冷媒を圧縮機に供給するものが出現している。 Therefore, usually the outdoor heat exchanger is provided in addition to the refrigerant heater (air heat exchanger) in the outdoor unit, by causing a heat exchange between the hot water or the like and the refrigerant (i.e., refrigerant heating), which relatively supplying hot refrigerant to the compressor have appeared. この種の空気調和機では、外気温と無関係に室内熱交換器での凝縮潜熱を確保できるため、厳冬時においても十分な暖房が可能となる。 In this type of air conditioner, it is possible to ensure the condensation latent heat of independently of the outside air temperature in the indoor heat exchanger, it is possible to be sufficiently heated in the cold winter time.
【0003】 [0003]
一方、大型の空気調和機では、室外ユニット内に複数の圧縮機を設置し、空調負荷の増減に応じて圧縮機の能力や運転台数を変えるものが知られている。 On the other hand, the large air conditioner, and installing a plurality of compressors in the outdoor unit, which alter the ability and number of operating compressor is known in accordance with the increase or decrease of the air conditioning load. 例えば、二台の圧縮機を備えるものでは、定速型圧縮機と最大能力が定速圧縮機と等しい可変型圧縮機とを組合せ、能力制御を広範囲に行うものがある。 For example, it intended to comprise two sets of compressors, constant-speed type compressor with a maximum capacity combined with equal variable displacement compressor and constant speed compressor is to perform capacity control over a wide range. この空気調和機では、50%以下の能力が要求される場合には可変型圧縮機のみを駆動し、50%以上の能力が要求される場合には両圧縮機を共に駆動する。 In this air conditioner, if 50% or less of the capacity is required to drive only the variable displacement compressor, both drives both compressor when 50% or more capacity is required. これにより、可変型圧縮機で5段階に能力切換が行えれば、全体では10段階の能力切換が可能となる。 Thus, if Okonaere ability switching the 5 stage variable displacement compressor, it is possible to capacity switching 10 stages as a whole.
【0004】 [0004]
【発明が解決しようとする課題】 [Problems that the Invention is to Solve
複数の圧縮機と冷媒加熱器とを備えたヒートポンプ型の空気調和機では、冷媒加熱を行いながら運転している際に、能力制御のために一部の圧縮機を停止させると、停止中の圧縮機やその圧縮機への吸込配管の内部に液冷媒が溜まる(冷媒が寝込む)ことがあった。 The plurality of compressors and refrigerant heater and the heat pump type air conditioner having a, when you are driving while refrigerant heating, when stopping part of the compressor for capacity control, suspended compressor and inside the liquid refrigerant suction pipe of the compressor is accumulated (refrigerant stay in bed) it was sometimes. これは、加熱されることにより冷媒の飽和温度が上昇し、冷媒の流れがなく外気に曝されて低温となった圧縮機や吸込配管に接触して冷媒が凝縮するもので、冷媒の寝込みは運転を続ける間に徐々に進行してゆく。 This saturation temperature of the refrigerant is increased by being heated and exposed to the outside air without any flow of the refrigerant in contact with the compressor and the suction pipe has become a low temperature in which the refrigerant is condensed, refrigerant liquefaction in gradually progressed while continuing the operation.
【0005】 [0005]
圧縮機や吸込配管内で冷媒が寝込んだ場合、再起動時に大量の液冷媒が圧縮機構に流入し、液圧縮により圧縮機が故障することがあった。 If you stagnated refrigerant in the compressor and the suction in the pipe, a large amount of liquid refrigerant at restart flows into the compression mechanism, the compressor had to be fault by the liquid compression. また、停止中の圧縮機やその吸込配管内に大量の冷媒が寝込むと、運転中の圧縮機や冷媒回路に流通する冷媒が不足し、空調が円滑に行えなくなることもあった。 Further, when the stay in bed a large amount of refrigerant in the compressor and the suction pipe of stopped, insufficient refrigerant flowing into the compressor and the refrigerant circuit during operation, the air conditioner is also a possible not smoothly performed. 更に、圧縮機内での冷媒の寝込み量が多くなると、液冷媒に浸されることにより、電動モータの巻線に絶縁破壊が生じることもあった。 Further, the stagnation of the refrigerant in the compressor increases, by being immersed in liquid refrigerant, was also a dielectric breakdown occurs in the windings of the electric motor. 尚、圧縮機の下部にはクランクケースヒータが付設されているが、これは圧縮機の停止時に封入された潤滑油に冷媒が溶け込むことを防止するものであり、圧縮機内に寝込んだ大量の液冷媒を気化させる能力はなく、また、吸込配管に寝込んだ液冷媒に対しては殆ど効果がなかった。 Incidentally, the lower portion of the compressor are attached crankcase heater, which is intended to prevent the refrigerant dissolves in the lubricating oil enclosed in the time of stopping the compressor, a large amount of liquid that asleep in the compressor no ability to vaporize the refrigerant, also had little effect on asleep but the liquid refrigerant to the suction pipe.
【0006】 [0006]
本発明は上記状況に鑑みなされたもので、冷媒加熱運転中における停止側の圧縮機やその吸込配管における冷媒の寝込みを解消した空気調和機を提供することを目的とする。 The present invention has been made in view of the above circumstances, and an object thereof is to provide an air conditioner that eliminates the stagnation of the refrigerant in the compressor and the suction pipe stop side of the refrigerant heating operation.
【0007】 [0007]
【課題を解決するための手段】 In order to solve the problems]
上記課題を解決するために、請求項1の発明では、暖房能力の調整のために並列に接続され単独もしくは同時運転される複数の圧縮機と、暖房運転時の熱源として利用する冷媒加熱手段とを有する空気調和機において、当該複数の圧縮機のうち、冷媒加熱運転時に停止しうる圧縮機にはメインクランクケースヒータとサブクランクケースヒータとからなる圧縮機加熱手段と、この圧縮機加熱手段を作動させる制御手段とを備え、前記冷媒加熱運転時に停止しうる圧縮機のみの運転停止の時は、この制御手段によってメインクランクケースヒータとサブクランクケースヒータとに通電し、いずれの圧縮機も運転を停止している時はメインクランクケースヒータのみに通電することを提案する。 In order to solve the above problems, the invention of claim 1, a plurality of compressors connected individually or simultaneously operated in parallel in order to adjust the heating capacity, and the refrigerant heating means for use as a heat source during the heating operation in the air conditioner having the among the plurality of compressors, a compressor heating means comprising a main crank case heater and sub crankcase heater to a compressor which can be stopped when the refrigerant heating operation, the compressor heating means and a control means for actuating, when the shutdown of only the compressor which can be stopped when the refrigerant heating operation, the control unit energizes the main crank case heater and sub crankcase heater, none of compressor operation when stopping the propose to energizing only the main crank case heater.
【0008】 [0008]
この発明によれば、例えば、二台の圧縮機のうち冷媒加熱運転時に停止される可能性があるものには十分な加熱能力を有する電気ヒータを付設し、冷媒加熱運転時における停止側圧縮機の電気ヒータに通電を行う。 According to the present invention, for example, and attached an electric heater with sufficient heating capacity for what might be stopped when the refrigerant heating operation out of the two sets of compressors, stop compressor during refrigerant heating operation to energize the electrical heater. これにより、停止側圧縮機の内部で冷媒が凝縮しなくなり、冷媒の寝込みに起因する圧縮機の故障等が防止される。 Accordingly, the refrigerant is not condensed in the inside of the stop-side compressor, a failure or the like of the compressor due to the stagnation of the refrigerant is prevented.
【0011】 [0011]
又、請求項2の発明では、圧縮機に吸入される冷媒を加熱して冷媒加熱運転を行わせる冷媒加熱手段と、同一の冷媒回路に並列に接続された複数の圧縮機とを有する空気調和機において、当該複数の圧縮機にそれぞれ対応する複数の吸込配管と、当該複数の吸込配管を連通させる連通路とを備えたものを提案する。 Further, in the invention of claim 2, an air conditioner having a refrigerant heating means refrigerant is heated to cause the refrigerant heating operation is sucked into the compressor, and a plurality of compressors connected in parallel to the same refrigerant circuit in machine is proposed which includes a plurality of suction pipes respectively corresponding to the plurality of compressors, and a communication passage for communicating the plurality of suction pipes.
【0012】 [0012]
この発明によれば、運転時に一部の圧縮機を停止させても、その吸込配管が運転側圧縮機の吸込配管に連通路を介して連通しているため、停止側圧縮機の吸込配管の冷媒が運転側圧縮機内に吸引されて冷媒の寝込みが防止される。 According to the invention, be stopped part of the compressor during operation, since the suction pipe is communicated through the communicating passage to the suction line of the driver-side compressor, the suction pipe stop compressor refrigerant is sucked into the driving side compressor refrigerant liquefaction is prevented.
【0013】 [0013]
【発明の実施の形態】 DETAILED DESCRIPTION OF THE INVENTION
以下、本発明の一実施形態を図面に基づき詳細に説明する。 Hereinafter, an embodiment with reference to the drawings in detail of the present invention.
【0014】 [0014]
図1には、室内ユニット1と室外ユニット3とからなる空気調和機の冷媒回路(実線で示す)および電気回路(一点鎖線で示す)を表している。 FIG. 1, the refrigerant circuit of an air conditioner comprising the indoor unit 1 and the outdoor unit 3 which (shown by the solid line) and (indicated by a chain line) an electrical circuit. 室内ユニット1内には、室内熱交換器5、電動ファン7、電動式の膨張弁9等と、電動ファン7および電動膨張弁9等を駆動制御する室内側ECU11とが収納されている。 In the indoor unit 1, the indoor heat exchanger 5, the electric fan 7, and the expansion valve 9 and the like of electric and indoor ECU11 for controlling the driving of the electric fan 7 and an electric expansion valve 9 and the like is housed. また、室外ユニット3内には、並列に配置された一対の圧縮機21,23、電磁式の四方弁25、並列に配置された室外熱交換器27および冷媒加熱器29、アキュムレータ31、電動ファン33等と、両圧縮機21,23、四方弁25、電動ファン33等を駆動制御する室外側ECU35とが収納されている。 Also within the outdoor unit 3, a pair of compressors 21, 23 arranged in parallel, solenoid type four-way valve 25, an outdoor heat exchanger arranged in parallel 27 and the refrigerant heater 29, an accumulator 31, an electric fan and 33, etc., both compressors 21 and 23, four-way valve 25, and the outdoor side ECU35 for controlling the driving of the electric fan 33, etc. are accommodated. 尚、室外熱交換器27は通常の空気熱交換器であるが、冷媒加熱器29は所定温度(本実施形態では、50℃)の温水と冷媒との間で熱交換を行わせる水熱交換器である。 Although the outdoor heat exchanger 27 is a conventional air heat exchanger, the refrigerant heater 29 is (in this embodiment, 50 ° C.) the predetermined temperature hydrothermal to perform heat exchange exchange between the hot and the refrigerant it is a vessel.
【0015】 [0015]
室内ユニット1および室外ユニット3内の機器類は冷媒配管51〜64により接続されており、暖房時(冷媒加熱運転時)には実線の矢印で示した方向に冷媒が循環し、冷房運転時には破線の矢印で示した方向に冷媒が循環する。 Equipment in the indoor unit 1 and the outdoor unit 3 are connected by refrigerant pipes 51-64, the refrigerant is circulated in the direction indicated by solid arrows during the heating (at the refrigerant heating operation), the broken line at the time of cooling operation refrigerant circulates in the direction indicated by the arrow. また、冷媒配管63と冷媒配管64とは連通配管65により連通されており、冷媒が両冷媒配管63,64の間で移動可能となっている。 Further, the refrigerant pipe 63 and the refrigerant pipe 64 is communicated with the communicating pipe 65, the refrigerant is movable between the two refrigerant pipes 63, 64. 図中、37,39は室外側ECU35により開閉駆動される電磁式の遮断弁であり、冷房あるいは暖房時において室外熱交換器27あるいは冷媒加熱器29への冷媒配管58,56を遮断する。 In the figure, 37 and 39 is an electromagnetic shut-off valves driven to open and close by the outdoor ECU 35, blocking the refrigerant pipe 58, 56 to the outdoor heat exchanger 27 or the refrigerant heater 29 in the cooling or the heating. また、41,43,45は冷媒を一方向へのみ流通させる逆止弁であり、冷媒配管51,52,60に介装されている。 In addition, 41, 43 and 45 is a check valve for only distribution in one direction of the refrigerant, are interposed in the refrigerant pipe 51,52,60.
【0016】 [0016]
図2には、圧縮機21,23およびアキュムレータ31周辺のレイアウトを示している。 Figure 2 shows the layout of the peripheral compressors 21, 23 and accumulator 31. 図2中で左方の圧縮機(以下、第1圧縮機と記す)21は可変型であり、空調運転時には優先的に駆動される。 Figure 2 left the compressor in (hereinafter, referred to as a first compressor) 21 is variable, at the time of air conditioning operation is driven preferentially. また、右方の圧縮機(以下、第2圧縮機と記す)23は定速型であり、50%以上の能力が要求された場合にのみ駆動される。 The right side of the compressor (hereinafter, referred to as the second compressor) 23 are constant-speed type, is driven only when more than 50% of capacity is requested. 両圧縮機21,23の下部には、メインクランクケースヒータ71が付設されており、第2圧縮機23の上部には更に圧縮機加熱手段である2本のサブクランクケースヒータ73,75が付設されている。 The lower of the two compressors 21 and 23 is annexed with a main crank case heater 71, two sub crank case heater 73, 75 on the top a further compressor heating means of the second compressor 23 is attached It is. メインクランクケースヒータ71とサブクランクケースヒータ73,75とは、同一容量(本実施形態では、32W)であり、図3に示したように、室外側ECU35により通電制御される。 A main crank case heater 71 and the sub crank case heater 73 and 75, (in this embodiment, 32W) the same capacity is, as shown in FIG. 3, is controlled energized by outdoor ECU 35.
【0017】 [0017]
一方、アキュムレータ31の直上部に接続した冷媒配管62は、2本の冷媒配管(以下、吸込配管と記す)63,64に分岐した後、下降してベースプレート(図示せず)の上面に沿って配管された後、上昇して両圧縮機21,23に接続している。 On the other hand, a refrigerant pipe 62 connected to the right above of the accumulator 31, two refrigerant pipes (hereinafter, referred to as the suction pipe) after branches to 63 and 64, along the upper surface of the base plate (not shown) is lowered after being piping connects rise to both the compressor 21 and 23. そして、両吸込配管63,64は、圧縮機21,23への立上り部位で、連通配管65を介して連通されている。 Then, double-suction pipe 63 and 64, the rising portion of the compressor 21 and 23 are communicated via the communicating pipe 65.
【0018】 [0018]
以下、本実施形態の作用を説明する。 Hereinafter, functions of this embodiment are described.
【0019】 [0019]
外気温が所定値以下に低下し、空気を熱源とした暖房ができなくなると、室外側ECU35は、通常の暖房運転から冷媒加熱運転への切換を行う。 Outside temperature falls below a predetermined value, becomes impossible heating in which the air as a heat source, outdoor ECU35 performs switching to the refrigerant heating operation from the normal heating operation. すなわち、遮断弁37を閉鎖する一方で遮断弁39を開放し、冷媒の供給先を室外熱交換器27から冷媒加熱器29に変更する。 That opens the shutoff valve 39 while closing the shut-off valve 37, to change the destination of the refrigerant from the outdoor heat exchanger 27 to the refrigerant heater 29. そして、電動ファン33を停止させると共に、図示しない温水源からの温水を冷媒加熱器29に供給させる。 Then, to stop the electric fan 33, to supply the hot water from the hot water source (not shown) to the refrigerant heater 29.
【0020】 [0020]
これにより、室内熱交換器5からの液冷媒は、冷媒配管55,56を介して冷媒加熱器29に流入し、その内部で温水との熱交換により比較的高温(例えば、20〜40℃)のガス冷媒となる。 Thus, the liquid refrigerant from the indoor heat exchanger 5, via a refrigerant pipe 55 flows into the refrigerant heater 29, a relatively high temperature by heat exchange with the hot water therein (e.g., 20 to 40 ° C.) a gas refrigerant. ガス冷媒は、冷媒配管57,61を介してアキュムレータ31に流入し、冷媒配管62〜64を介して第1および第2圧縮機21,23に吸入される。 Gas refrigerant flows into the accumulator 31 via the refrigerant pipe 57 and 61, and is sucked into the first and second compressors 21 and 23 through the refrigerant pipe 62 to 64. この際、冷媒配管60に逆止弁45が設けられているため、室外熱交換器27側へのガス冷媒の流入が防止される。 At this time, since the check valve 45 is provided in the refrigerant pipe 60, the flow of gas refrigerant to the outdoor heat exchanger 27 side is prevented. 第1および第2圧縮機21,23に吸入されたガス冷媒は、その内部で圧縮されて高温高圧となり、冷媒配管51〜54を介して室内熱交換器5に流入する。 Inhaled gas refrigerant to the first and second compressors 21 and 23 is brought into a high temperature and high pressure is compressed therein and flows into the indoor heat exchanger 5 via the refrigerant pipe 51 to 54. そして、高温のガス冷媒は、電動ファン7に送風された室内空気に熱エネルギーを放出して暖房を行う一方、室内熱交換器5内で徐々に凝縮して再び液冷媒となる。 The high-temperature gas refrigerant while performing heating by releasing heat energy to blast in-room air to the electric fan 7 again becomes liquid refrigerant gradually condenses in the indoor heat exchanger within 5.
【0021】 [0021]
さて、室外側ECU35は、室外ユニットへの能力要求が小さくなった場合、第1圧縮機21の能力制御を行うと共に、第2圧縮機23を停止させる。 Now, outdoor ECU35, when capability request to the outdoor unit is reduced, performs control of the capacity of the first compressor 21, it stops the second compressor 23. すると、アキュムレータ31からのガス冷媒は、冷媒配管62,63を介して第1圧縮機21のみに吸入され、その内部で圧縮された後、冷媒配管51,53〜54を介して室内熱交換器5に流入することになる。 Then, the gas refrigerant from the accumulator 31 is sucked only into the first compressor 21 via the refrigerant pipe 62 and 63, after being compressed therein, the indoor heat exchanger through the refrigerant pipe 51,53~54 It will be flowing into the 5. この際、冷媒配管52に逆止弁43が設けられているため、第1圧縮機21から吐出されたガス冷媒が第2圧縮機23側に流入することが防止される。 At this time, since the check valve 43 to the refrigerant pipe 52 is provided, the gas refrigerant discharged from the first compressor 21 is prevented from flowing into the second compressor 23.
【0022】 [0022]
次に、第2圧縮機23および吸込配管64における冷媒の寝込みを防止する手順について述べる。 Next, we describe a procedure to prevent refrigerant liquefaction in the second compressor 23 and suction pipe 64.
【0023】 [0023]
冷媒加熱運転中に第2圧縮機23を停止させた場合、冷媒が吸込配管64や第2圧縮機23の内部で寝込む虞がある。 When the second compressor 23 is stopped in the refrigerant heating operation, there is a possibility that the refrigerant be laid up for a long time inside the suction pipe 64 and the second compressor 23. すなわち、冷媒の流れがなく外気に曝されて低温となった吸込配管64や第2圧縮機23に触れた場合、加熱されて飽和温度の高くなったガス冷媒は容易に凝縮し、液冷媒としてこれらの内部に溜まることがある。 That is, when the touched suction pipe 64 and the second compressor 23 becomes a low temperature is exposed to the outside air without any flow of the refrigerant, is heated raised gas refrigerant saturation temperature is easily condensed, as a liquid refrigerant sometimes these accumulated therein. 本実施形態では、このような冷媒の寝込みを防止するため、以下に述べる二つの手段を採っている。 In the present embodiment, in order to prevent the liquefaction of such a refrigerant, it takes the two means described below.
【0024】 [0024]
室外側ECU35は、空気調和機の運転が開始されると、所定の制御インターバルで、図4に示したクランクケースヒータ通電制御サブルーチンを繰り返し実行する。 Outdoor ECU35, when operation of the air conditioner is started, at predetermined control intervals to repeat the crank case heater energization control subroutine shown in FIG. 室外側ECU35は、このサブルーチンを開始すると、先ずステップS1で平行処理されている各種サブルーチンからの運転情報を読み込んだ後、ステップS3で第2圧縮機23が停止中であるか否かを判定する。 Outdoor ECU35 judges At the start of the subroutine, after reading the operation information from the various subroutines which are first parallel processing in step S1, the second compressor 23 in step S3 as to whether or not is being stopped .
【0025】 [0025]
そして、この判定がNo 、すなわち、第2圧縮機23が運転中であれば、室外側ECU35は、ステップS5でメインクランクケースヒータ71およびサブクランクケースヒータ73,75への通電を中止させる。 Then, the determination is No, i.e., if the second compressor 23 is in operation, the outdoor side ECU35 is to stop the energization of the main crank case heater 71 and the sub crank case heater 73, 75 in step S5. これは、運転中であれば冷媒回路の温度が十分に高くなっているため、第2圧縮機23および吸込配管64内での冷媒の凝縮は起こり得ず、逆に不要な加熱を行うことにより第2圧縮機23の温度が過度に上昇するためである。 This is because the temperature of the refrigerant circuit, if in operation is sufficiently high, the condensation of the refrigerant in the second compressor 23 and the suction pipe 64. can not occur, by performing unnecessary heating in the opposite This is because the temperature of the second compressor 23 from being excessively increased.
【0026】 [0026]
ステップS3の判定がYesであった場合、室外側ECU35は、ステップS7で第1圧縮機21が運転中であり且つ冷媒加熱運転が行われているか否かを判定する。 If the determination in step S3 was Yes, the outdoor side ECU35 is a first compressor 21 is in operation in step S7 and determines whether or not the refrigerant heating operation is being performed. そして、この判定がNo であれば、室外側ECU35は、ステップS9でメインクランクケースヒータ71へのみ通電を開始する。 And if this determination is No, outdoor ECU35 starts only energizing the main crank case heater 71 in step S9. すなわち、冷房運転時や通常の暖房運転時には、封入された潤滑油への冷媒の溶け混みを防止するため、第2圧縮機23の温度をある程度高く維持する。 That is, when the time and the normal heating operation cooling operation, to prevent congestion melting of the refrigerant into the sealed lubricating oil, to maintain the temperature of the second compressor 23 high to some extent. また、冷媒加熱運転時であっても、第1圧縮機21も停止していれば、冷媒が寝込む虞がないため、上述した理由で第2圧縮機23の温度をある程度高く維持する。 Further, even when refrigerant heating operation, if the stop also the first compressor 21, since there is no possibility that the refrigerant be laid up for a long time, to maintain high to some extent the temperature of the second compressor 23 for the reasons described above.
【0027】 [0027]
ステップS7の判定がYes、すなわち、冷媒加熱運転時に第1圧縮機21のみが運転されている場合、室外側ECU35は、ステップS11でメインクランクケースヒータ71およびサブクランクケースヒータ73,75への通電を開始する。 Determination of step S7 is Yes, i.e., if only the first compressor 21 during the refrigerant heating operation is operated, outdoor ECU35 is energized to the main crank case heater 71 and the sub crank case heater 73, 75 in step S11 the start. これにより、第2圧縮機23は全体的に加熱され、その内部温度がガス冷媒の飽和温度より高くなり、冷媒が寝込む原因となる液冷媒の凝縮が防止される。 Thus, the second compressor 23 is generally heated, its internal temperature becomes higher than the saturation temperature of the gas refrigerant, the condensed liquid refrigerant cause the stay in bed refrigerant is prevented.
【0028】 [0028]
一方、アキュムレータ31からのガス冷媒は、冷媒配管62を介して吸込配管64に流入した後、低温となった管壁に触れることにより徐々に凝縮する。 On the other hand, the gas refrigerant from the accumulator 31, after flowing into the suction pipe 64 through the refrigerant pipe 62, gradually condensed by touching the tube wall becomes cold. そして、凝縮により生成された液冷媒は、ガス冷媒より比重が大きいため、吸込配管64の下部に溜まる。 Then, the liquid refrigerant produced by the condensation, specific gravity than gas refrigerant is large, accumulated in the lower portion of the suction pipe 64. ことろが、本実施形態では、吸込配管64が連通配管65を介して吸込配管63に連通され、且つその連通部位が吸込配管64の最下部かつ第2圧縮機23への立上り部に設けられているため、吸込配管64内ではガス冷媒の流れが生じ、液冷媒が殆ど生成されない。 Kotoro is, in this embodiment, the suction pipe 64 is communicated with the suction pipe 63 through the communicating pipe 65, and the communicating parts are provided at the rising portion of the bottom and the second compressor 23 of the suction pipe 64 and for which results a flow of gas refrigerant in the suction pipe 64., it is not generated almost liquid refrigerant. また、液冷媒が生成された場合にも、吸込配管64内に溜まることなく、速やかに第1圧縮機21に吸引される。 Further, even when the liquid refrigerant is generated without accumulating in the suction pipe 64, it is quickly sucked into the first compressor 21. その結果、吸込配管64内における液冷媒の寝込みも完全に防止され、第2圧縮機23の再起動時においても、液冷媒が第2圧縮機23に流入することが防止される。 As a result, prevents the suction completely even stagnation of the liquid refrigerant in the pipe 64, even when restarting the second compressor 23, the liquid refrigerant is prevented from flowing into the second compressor 23.
【0029】 [0029]
このように、本実施形態では、第2圧縮機23にサブクランクケースヒータ73,75を付設して適宜通電制御を行うと共に、両圧縮機21,23の吸込配管63,64を連通させるようにしたため、第2圧縮機23やその吸込配管64における冷媒の寝込みを防止することができた。 Thus, in this embodiment, it performs appropriate power control by attaching a sub crank case heater 73 and 75 to the second compressor 23, a suction pipe 63, 64 of both compressor 21 and 23 so as to communicate since the, it was possible to prevent refrigerant liquefaction in the second compressor 23 and the suction pipe 64. その結果、従来装置で問題となっていた、液圧縮による圧縮機の故障や、冷媒の不足による空調不良、電動モータの巻線の絶縁破壊等の不具合が完全に解消された。 As a result, has been a problem in the conventional apparatus, failure or compressor by liquid compression, air-conditioning failure due to lack of the refrigerant, a problem of dielectric breakdown or the like of the windings of the electric motor has been completely eliminated.
【0030】 [0030]
以上で具体的実施形態の説明を終えるが、本発明は上述した実施形態に限定されるものではない。 Above concludes the description of the specific embodiments, the invention is not limited to the embodiments described above. 例えば、上記実施形態では、圧縮機加熱手段と連通路とを共に用いるようにしたが、いずれか一方のみでも所定の効果を得ることができる。 For example, in the above embodiment, as adapted to use both the compressor heating means and the communication path, it is possible to obtain a predetermined effect in only one. また、上記実施形態は、可変型圧縮機と定速型圧縮機とを一台ずつ備えた空気調和機に本発明を適用したものであるが、一台の可変型圧縮機と二台以上の定速型圧縮機を備えた空気調和機に適用してもよい。 Further, the above-described embodiment, a variable displacement compressor and constant speed compressor is obtained by applying the present invention to an air conditioner having one by one, a single variable type compressor and two or more units it may be applied to an air conditioner having a constant-speed type compressor. また、本発明を定速圧縮機のみを複数台備えてこれらを交互に運転させる空気調和機に適用してもよいし、その場合にはサブクランクケースヒータを全ての圧縮機に備えることが望ましい。 Further, the present invention may be applied to an air conditioner for driving are alternately provided with a plurality only constant-speed compressor, it is desirable to have a sub crank case heater to all of the compressors in which case . また、上記実施形態は電動圧縮機を備えた空気調和機に適用したものであるが、ガスヒートポンプ型の空気調和機等に適用してもよいし、室内ユニットや室外ユニットを複数備えたものに適用してもよい。 Also, to those but the embodiment is applied to an air conditioner having an electric compressor, it may be applied to a gas heat pump type air conditioner or the like, including a plurality of indoor units and outdoor unit application may be. 更に、装置の具体的構成や制御の手順等についても、本発明の趣旨を逸脱しない範囲で、適宜変更可能である。 Furthermore, for the like specific configuration and control procedures of the apparatus, without departing from the scope of the present invention can be appropriately changed.
【0031】 [0031]
【発明の効果】 【Effect of the invention】
以上述べたように、本発明の冷凍機によれば、冷媒加熱運転時に停止中の圧縮機を圧縮機加熱手段により加熱したり、複数の圧縮機の吸込配管を連通させるようにしたため、圧縮機や吸込配管における冷媒の寝込みを防止することができ、液圧縮による圧縮機の故障や、冷媒の不足による空調不良、電動モータの巻線の絶縁破壊等の不具合を解消できる。 As described above, according to the refrigerator of the present invention, since as or heated by the compressor heating means the stopped compressor when refrigerant heating operation, to communicate the suction pipe of the plurality of compressors, a compressor and it is possible to prevent refrigerant liquefaction in the suction pipe can be eliminated failure or compressor by liquid compression, air-conditioning failure due to lack of the refrigerant, a problem of dielectric breakdown or the like of the windings of the electric motor.
【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS
【図1】本発明の一実施形態に係る空気調和機の概略構成図である。 1 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention.
【図2】圧縮機およびアキュムレータ周辺のレイアウトを示す斜視図である。 2 is a perspective view showing the compressor and the layout near the accumulator.
【図3】圧縮機の側面図である。 FIG. 3 is a side view of the compressor.
【図4】クランクケースヒータ通電制御サブルーチンの手順を示したフローチャートである。 4 is a flowchart showing a procedure of the crank case heater energization control subroutine.
【符号の説明】 DESCRIPTION OF SYMBOLS
1 室内ユニット3 室外ユニット21 第1圧縮機23 第2圧縮機27 室外熱交換器29 冷媒加熱器31 アキュムレータ35 室外側ECU 1 indoor unit 3 outdoor unit 21 first compressor 23 second compressor 27 outdoor heat exchanger 29 refrigerant heater 31 accumulator 35 outdoor ECU
37,39 遮断弁63,64 吸込配管65 連通配管71 メインクランクケースヒータ73,75 サブクランクケースヒータ 37, 39 65 communicating shutoff valve 63 suction pipe piping 71 main crank case heater 73, 75 sub crankcase heater

Claims (2)

  1. 暖房能力の調整のために並列に接続され単独もしくは同時運転される複数の圧縮機と、暖房運転時の熱源として利用する冷媒加熱手段とを有する空気調和機において、当該複数の圧縮機のうち、冷媒加熱運転時に停止しうる圧縮機にはメインクランクケースヒータとサブクランクケースヒータとからなる圧縮機加熱手段と、この圧縮機加熱手段を作動させる制御手段とを備え、前記冷媒加熱運転時に停止しうる圧縮機のみの運転停止の時は、この制御手段によってメインクランクケースヒータとサブクランクケースヒータとに通電し、いずれの圧縮機も運転を停止している時はメインクランクケースヒータのみに通電し、これにより暖房能力の低下のために圧縮機の単独運転時における運転停止中の圧縮機を加熱してこの停止中の圧縮機への A plurality of compressors connected individually or simultaneously operated in parallel in order to adjust the heating capacity, in the air conditioner and a refrigerant heating unit for use as a heat source during the heating operation, among the plurality of compressors, comprising a compressor heating means comprising a main crank case heater and sub crankcase heater to a compressor which can be stopped when the refrigerant heating operation, and control means for operating the compressor heating means, and stops when the refrigerant heating operation when the operation stop of the compressor only that may the by the control means energizes the main crank case heater and sub crankcase heater, also energized only the main crankcase heater when stopping the operation either of the compressor , thereby the heating the compressor in operation stop during the single operation of the compressor for lowering the heating capacity to the compressor during the stop 媒寝込みをしにくくしたことを特徴とする空気調和機。 An air conditioner characterized by being difficult to the medium stagnation.
  2. 請求項1記載の空気調和機において、当該複数の圧縮機にそれぞれ対応する複数の吸込配管と、当該複数の吸込配管を連通させる連通路とを備えたことを特徴とする空気調和機。 In claim 1 the air conditioner according, air conditioner characterized by comprising a communicating path for communicating with a plurality of suction pipes respectively corresponding to the plurality of compressors, the plurality of suction pipes.
JP22240696A 1996-08-23 1996-08-23 Air conditioner Expired - Fee Related JP3653348B2 (en)

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