Refrigeration cycle apparatus
a technology of refrigeration cycle and compressor, which is applied in the direction of refrigeration safety arrangement, refrigeration components, light and heating apparatus, etc., can solve the problems of insufficient displacement of expansion mechanism and displacement of compression mechanism, and achieve the effect of reducing the pressure difference between high and low pressure in the refrigeration cycle and saving energy
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first embodiment
[0027]FIG. 1 shows a refrigeration cycle apparatus 100A according to the first embodiment of the present invention. This refrigeration cycle apparatus 100A is provided with a refrigerant circuit 3 that allows a refrigerant to circulate therein. The refrigerant circuit 3 is composed of a first compressor (expander-compressor unit) 1, a second compressor 2, a radiator 4, an evaporator 5, and first to fourth pipes 3a to 3d connecting these devices.
[0028]The first compressor 1 has a first closed casing 10 accommodating a first compression mechanism 11, a first motor 12, and an expansion mechanism 13 that are sequentially coupled to one another by a first shaft 15. The second compressor 2 has a second closed casing 20 accommodating a second compression mechanism 21 and a second motor 22 that are coupled to each other by a second shaft 25. The first compression mechanism 11 and the second compression mechanism 21 are connected to the radiator 4 via the first pipe 3a having two branch pipe...
second embodiment
[0047]Next, FIG. 5 shows a refrigeration cycle apparatus 100B according to the second embodiment of the present invention. In this embodiment, the same components (including the steps in the flow chart) as those in the first embodiment are denoted by the same reference numerals, and the descriptions thereof are omitted. This can be applied similarly to the third to sixth embodiments to be described later.
[0048]The refrigeration cycle apparatus 100B of this embodiment is provided with a pre-expansion temperature sensor 82 for detecting the temperature of the refrigerant flowing in the second pipe 3b, a high pressure side pressure sensor 72 for detecting the pressure of the refrigerant flowing in the second pipe 3b, a pre-compression temperature sensor 81 for detecting the temperature of the refrigerant flowing in the fourth pipe 3d, and a low pressure side pressure sensor 71 for detecting the pressure of the refrigerant flowing in the fourth pipe 3d. In this embodiment, the high pres...
third embodiment
[0057]Next, the third embodiment of the present invention is described. The refrigeration cycle apparatus of this embodiment has the same configuration as the refrigeration cycle apparatus 100A of the first embodiment shown in FIG. 1, and therefore the diagram showing the configuration thereof is omitted.
[0058]This embodiment differs from the first embodiment only in the control performed by the control device 6. Specifically, in this embodiment, the first braking time Tf within which the first motor 12 is to be stopped and the second braking time Tp within which the second motor 22 is to be stopped are set in advance, and these braking times Tf and Tp are stored in the memory of the control device 6. The second braking time Tp is set shorter than the first braking time Tf. The first braking time Tf, for example, is one minute, and the second braking time Tp, for example, is 30 seconds. Then, the control device 6 completely stops the second motor 22 prior to the first motor 12 on th...
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