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    • 1. 发明公开
    • REFRIGERATION UNIT
    • KÜHLEINHEIT
    • EP2402681A4
    • 2017-04-05
    • EP09840728
    • 2009-11-30
    • DAIKIN IND LTD
    • TAKEGAMI MASAAKISAKAE SATORUKONDOU AZUMATAKEUCHI RYUUJI
    • F25B1/00F25B31/00
    • F25B13/00F25B31/004F25B2313/005F25B2313/0233F25B2313/02743
    • In a refrigerant circuit (20), the variable capacity compressor (40a) sucks refrigerant through a first suction pipe (51), and a second fixed capacity compressor (40c) sucks refrigerant through a third suction pipe (53). Refrigeration oil of an oil separator (47a-47c) flows into the compressor (40a-40c) through an oil return pipe (54) and a main injection pipe (61) together with intermediate-pressure refrigerant. During a normal operation, a controller (200) adjusts the degree of opening of an injection motor-operated valve (64a-64c) so that the temperature of refrigerant discharged from the corresponding compressor reaches a predetermined target value. If the first suction pipe (51) has a pressure lower than that of the third suction pipe (53), the controller temporarily decreases the degree of opening of the first injection motor-operated valve (64a) as compared to that during the normal operation, and temporarily increases the degree of opening of the third injection motor-operated valve (64c) as compared to that during the normal operation. As a result, the flow rate of intermediate-pressure refrigerant and refrigeration oil flowing into the second fixed capacity compressor (40c) is increased.
    • 在制冷剂回路(20)中,可变容量压缩机(40a)通过第一吸入管(51)吸引制冷剂,第二固定容量压缩机(40c)通过第三吸入管(53)吸入制冷剂。 油分离器(47a-47c)的制冷油与中压制冷剂一起通过回油管(54)和主喷射管(61)流入压缩机(40a〜40c)。 在正常操作期间,控制器(200)调节喷射电动阀(64a-64c)的打开程度,使得从相应的压缩机排出的制冷剂的温度达到预定的目标值。 如果第一吸入管51的压力低于第三吸入管53的压力,则与正常运转时相比,控制器暂时降低第一喷射电动阀64a的开度 并且与正常操作相比暂时增加第三喷射电动阀(64c)的打开程度。 结果,流入第二固定容量压缩机40c的中压制冷剂和冷冻机油的流量增加。
    • 6. 发明公开
    • REFRIGERATION DEVICE
    • KÜHLVORRICHTUNG
    • EP2192361A4
    • 2017-03-29
    • EP08828804
    • 2008-08-28
    • DAIKIN IND LTD
    • TAKEGAMI MASAAKISAKAE SATORU
    • F25B1/00F25B13/00
    • F25B41/046F25B13/00F25B49/022F25B2313/02743F25B2313/02792F25B2313/0292F25B2400/075F25B2500/26F25B2600/021Y02B30/741
    • A refrigeration device (1) includes a switching valve control section (58) for outputting a switching signal for controlling a four-way switching valve (20) to a predetermined switching state when starting a compression mechanism (40); and a switching determination section (59) which, when starting only a first compressor (14a) as a start-up of the compression mechanism (40), outputs a low differential pressure signal if a differential pressure between a high-pressure port (P1) and a low-pressure port (P3) in the four-way switching valve (20) falls below a determination value in a determination operation after the switching signal being outputted by the switching valve control section (58). After the switching determination section (59) outputs the low differential pressure signal, a capacity control section (51) starts a second compressor (14b).
    • 本发明的制冷装置(1)具备:切换阀控制部(58),其在启动压缩机构(40)时将用于控制四通切换阀(20)的切换信号输出至规定的切换状态。 以及切换判定部(59),在仅使作为压缩机构(40)的启动的第一压缩机(14a)起动时,在高压端口(P1)与高压端口 )和四通切换阀(20)中的低压端口(P3)在由切换阀控制部(58)输出的切换信号之后的判定操作中低于判定值。 在切换判定部分(59)输出低压差信号之后,容量控制部分(51)启动第二压缩机(14b)。