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Refrigeration cycle apparatus

a technology of refrigerating cycle and apparatus, which is applied in the direction of domestic cooling apparatus, lighting and heating apparatus, liquid fuel engines, etc., can solve the problems of reliability and efficiency of refrigerating cycle apparatus, and achieve optimal high pressure, reduce the rotation speed of the first motor, and increase the rotation speed

Inactive Publication Date: 2011-06-16
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0038]The above-mentioned configuration makes it possible to decrease the rotation speed of the first motor of the first compressor and increase the rotation speed of the second motor of the second compressor automatically at a necessary timing, and thereby the amounts of oils in the first compressor and the second compressor can be balanced with each other. Moreover, at this time, it is possible to keep the high pressure in the refrigeration cycle at an optimal high pressure by increasing the opening of the bypass valve or that of the injection valve. Therefore, the present invention makes it possible to perform an operation in which the high pressure in the refrigeration cycle is kept at the optimal high pressure and the COP is maximized while both of the oil amounts of the first oil pool and the second oil pool are ensured stably.

Problems solved by technology

Since the compression mechanism is coupled to the expansion mechanism by the shaft in the expander-compressor unit, there may be a case where the displacement of the compression mechanism is insufficient or a case where the displacement of the expansion mechanism is insufficient, depending on the operational conditions.
Such a refrigeration cycle apparatus has problems in the context of reliability and efficiency if the amount of the oil held in each of the compressors 320, 330 is unbalanced.

Method used

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Experimental program
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embodiment 1

[0052]FIG. 1 shows a refrigeration cycle apparatus 100A according to Embodiment 1 of the present invention. The refrigeration cycle apparatus 100A includes a refrigerant circuit 103. The refrigerant circuit 103 is composed of a first compressor (expander-compressor unit) 101, a second compressor 102, a radiator 4, an evaporator 6, and first to fourth pipes 3a to 3d connecting these components.

[0053]Specifically, a first discharge pipe 19 of the first compressor 101 and a second discharge pipe 20 of the second compressor 102 are connected to the heat radiator 4 via the first pipe 3a having two branch pipes joined to one main pipe. The heat radiator 4 is connected to a suction pipe 21 on the expansion side of the first compressor 101 via the second pipe 3b. A discharge pipe 22 on the expansion side of the first compressor 101 is connected to the evaporator 6 via the third pipe 3c. The evaporator 6 is connected to a first suction pipe 7 of the first compressor 101 and a second suction ...

embodiment 2

[0119]FIG. 7 shows a refrigeration cycle apparatus 100B according to Embodiment 2 of the present invention. The refrigeration cycle apparatus 100B according to Embodiment 2 is the same as the refrigeration cycle apparatus 100A according to Embodiment 1, except that an injection passage 3f is provided instead of the bypass passage 3e. Thus, the same components as those used in Embodiment 1 are designated by the same reference numerals, and the descriptions thereof are omitted. The first compressor 101 and the second compressor 102 each are drawn in a lying posture also in FIG. 7 as in FIG. 5, but as shown in FIG. 2 and FIG. 4, they actually are vertical-type compressors as in Embodiment 1.

[0120]The injection passage 3f is branched from the second pipe 3b and supplies additionally the refrigerant to the expansion mechanism 5 in the expansion process. The injection passage 3f is provided with an opening-adjustable injection valve 71 for adjusting the injection flow rate.

[0121]The metho...

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Abstract

A refrigeration cycle apparatus (100A) includes a first compressor (101) that is an expander-compressor unit, a second compressor (102), and a controller (300). The controller (300) shifts, when an oil level 51 of a first oil pool (13) becomes equal to or lower than a specified level L, to an oil-equalizing operation in which a rotation speed of a first motor (12) is decreased only by a specified decrement and a rotation speed of a second motor (12) is increased by a specified increment, and an opening of a bypass valve (70) is increased so that a pressure or a temperature of a discharged refrigerant guided to a radiator (4) through a first pipe (3a) is kept approximately constant, and returns the rotation speeds of the first motor (11) and the second motor (12) as well as the opening of the bypass valve (70) to conditions before start of the oil-equalizing operation when a specified period of time has elapsed since the start of the oil-equalizing operation.

Description

TECHNICAL FIELD[0001]The present invention relates to a refrigeration cycle apparatus used for water heaters, air conditioners, etc., having an expansion mechanism and compression mechanisms.BACKGROUND ART[0002]In recent years, for the purpose of further enhancing the efficiencies of refrigeration cycle apparatuses, there have been proposed power recovery type refrigeration cycle apparatuses having an expansion mechanism instead of an expansion valve, in which the expansion mechanism recovers the pressure energy as power during a process in which a refrigerant is expanded, and thus the electric power required for driving the compression mechanism is reduced by the amount of the power recovered. Such refrigeration cycle apparatuses uses an expander-compressor unit in which a motor, a compression mechanism, and an expansion mechanism are coupled by a shaft.[0003]Since the compression mechanism is coupled to the expansion mechanism by the shaft in the expander-compressor unit, there ma...

Claims

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Application Information

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IPC IPC(8): F25B49/02F25D17/02
CPCF25B1/04F25B9/06F25B31/004Y02B30/741F25B2600/0253F25B2700/03F25B2400/075F04C18/0215F04C18/356F04C23/008F04C28/02F04C28/08F04C2270/24Y02B30/70
Inventor OGATA, TAKESHITAKAHASHI, YASUFUMIMATSUI, MASARUWADA, MASANOBUHIKICHI, TAKUMI
Owner PANASONIC CORP