Refrigeration device
A refrigeration device and refrigerant technology, applied in the direction of refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve the problems that are difficult to be controlled by the refrigerant liquid level of the liquid container, generate gas refrigerant, etc., and achieve the realization of the refrigerant liquid level Control and stabilize the effect of refrigerant liquid level control
Inactive Publication Date: 2009-08-19
DAIKIN IND LTD
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Problems solved by technology
[0004] In the refrigerant circuit of this type of refrigeration device, if the pressure of the refrigerant flowing from the first expansion valve to the second expansion valve (hereinafter referred to as the intermediate pressure) is significantly lower than the saturation pressure, gas refrigerant is often generated, Therefore, it is difficult to control the refrigerant liquid level of the receiver
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[0035]
[0036] figure 1 A schematic refrigerant circuit 2 of the air conditioner 1 according to the embodiment of the present invention is shown.
[0037] The air conditioner 1 is an air conditioner that uses carbon dioxide as a refrigerant and can perform cooling and heating operations, and mainly includes: a refrigerant circuit 2; air supply fans 26, 32; a control device 23; a high pressure sensor 21; a temperature sensor 22 ; And the intermediate pressure pressure sensor 24 and the like.
[0038] The refrigerant circuit 2 is mainly equipped with: compressor 11, four-way switching valve 12, outdoor heat exchanger 13, first electric expansion valve 15, liquid receiver 16, second electric expansion valve 17, and indoor heat exchanger 31, such as figure 1 As shown, each device is connected by refrigerant piping.
[0039] In this embodiment, the air conditioner 1 is a split type air conditioner, which can also be said to include: an indoor unit 30 mainly including an ind...
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A refrigeration device having a refrigerant circuit formed by sequentially connecting a compressor, a radiator, a first expansion valve, a liquid receiver, a second expansion valve, and an evaporator, in which the level of refrigerant liquid in the liquid receiver is stably controlled. The refrigeration device (1, 101) has a compression mechanism (11), a radiator (13), a first expansion mechanism (15), a liquid receiver (16), a second expansion mechanism (17, 33a, 33b), an evaporator (31, 31a, 31b), a pressure detection section (21), a temperature detection section (22), and a control section (23). The pressure detection section is provided between the refrigerant outlet side of the compression mechanism and the refrigerant inlet side of the first expansion mechanism. The temperature detection section is provided between the exit side of the radiator and the refrigerant inlet side of the first expansion mechanism. The control section uses a pressure detected by the pressure detection section and a temperature detected by the temperature detection section to control the first expansion mechanism so that the refrigerant flowing out of the first expansion mechanism is in a saturated state.
Description
technical field [0001] The present invention relates to a refrigerating device, in particular to a refrigerating device in which a refrigerant becomes a supercritical state in a refrigerating cycle. Background technique [0002] Conventionally, there is known a refrigeration device including a refrigerant circuit in which a compressor, a radiator, a first expansion valve, a liquid receiver, a second expansion valve, and an evaporator are sequentially connected (for example, refer to Patent Document 1). [0003] Patent Document 1: Japanese Patent Laid-Open No. 10-115470 (line 12, column 5, page 4 to line 39, column 7, page 5, image 3 ) [0004] In the refrigerant circuit of such a refrigeration device, if the pressure of the refrigerant flowing from the first expansion valve to the second expansion valve (hereinafter referred to as the intermediate pressure) is significantly lower than the saturation pressure, gas refrigerant is often generated, Therefore, it is difficult t...
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IPC IPC(8): F25B1/00F25B43/00
CPCF25B2313/0311F25B2313/006F25B2313/0233F25B2309/061F25B2700/1931F25B2700/2102F25B2600/17F25B9/008F25B2341/063F25B13/00F25B2600/2513F25B2700/191F25B2400/16F25B2341/0662F25B2313/02741F25B41/39
Inventor 笠原伸一栗原利行
Owner DAIKIN IND LTD