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Air conditioner and refrigerant amount determining method

A technology of air conditioning and refrigerant quantity, which is applied in the direction of refrigerators, refrigeration components, refrigeration and liquefaction, etc., which can solve problems such as the reduction of refrigerant quantity, the increase of compressor temperature, and the decrease of compressor reliability, so as to improve the judgment accuracy and maintain detection The effect of maintaining accuracy and reliability

Inactive Publication Date: 2011-04-13
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, before the determination is made, since most of the refrigerant in the target part of the determination can be liquefied, the amount of refrigerant sucked by the compressor to be sent to the condenser is reduced.
Therefore, the temperature of the compressor will rise and the reliability of the compressor will decrease

Method used

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  • Air conditioner and refrigerant amount determining method
  • Air conditioner and refrigerant amount determining method
  • Air conditioner and refrigerant amount determining method

Examples

Experimental program
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Effect test

no. 1 approach

[0151] Structure of the air conditioning device

[0152] figure 1 It is a schematic configuration diagram of the air-conditioning apparatus 1 according to the first embodiment of the present invention.

[0153] The air-conditioning apparatus 1 is an apparatus used for cooling and heating indoors of a building or the like by performing a vapor compression refrigeration cycle operation.

[0154] The air conditioner 1 mainly includes an outdoor unit 2 as a heat source unit, two indoor units 4 as utilization units connected in parallel to it, and a liquid refrigerant as a refrigerant communication pipe connecting the outdoor unit 2 and the indoor unit 4. The connection pipe 6 and the gas refrigerant connection pipe 7. That is, the vapor compression refrigerant circuit 10 of the air-conditioning apparatus 1 according to the present embodiment is configured by connecting the outdoor unit 2 , the indoor unit 4 , the liquid refrigerant communication pipe 6 , and the gas refrigerant...

no. 2 approach

[0380] Structure of the air conditioning device

[0381] Figure 28 It is a schematic configuration diagram of the air-conditioning apparatus 201 according to the second embodiment of the present invention.

[0382] The air conditioner 201 is an apparatus used for cooling and heating indoors of a building or the like by performing a vapor compression type refrigeration cycle operation.

[0383] The air conditioner 201 mainly includes one outdoor unit 2 as a heat source unit, a plurality of (two in this embodiment) indoor units 4 and 5 as utilization units connected in parallel to it, the outdoor unit 2 and the indoor unit 4, 5 as the liquid refrigerant connecting pipe 6 and the gas refrigerant connecting pipe 7 connected as the refrigerant connecting pipe. That is, the vapor compression refrigerant circuit 210 of the air-conditioning apparatus 201 of this embodiment is configured by connecting the outdoor unit 2 , the indoor units 4 and 5 , the liquid refrigerant communicat...

no. 3 approach

[0611] In the above-mentioned first and second embodiments and the air-conditioning apparatuses 1 and 201 of their modified examples, a case where the present invention is applied to a configuration capable of switching between refrigerant operation and heating operation has been described as an example.

[0612] However, the present invention is not limited thereto, for example Figure 48 As shown in the air-conditioning apparatus 301 of the present embodiment shown, if a cooling operation is performed for a certain air-conditioned space while a heating operation is performed for another air-conditioned space, it can also be compared with the air-conditioned spaces in the house where the indoor units 4 and 5 are installed. Requirements are met, and the present invention is applicable to a structure capable of simultaneously operating cooling and heating.

[0613] Structure of the third embodiment

[0614] The air conditioner 201 of this embodiment mainly includes a pluralit...

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Abstract

An air conditioner and a refrigerant amount determining method which are able to accurately and simply determine the amount of a refrigerant without impairing the reliability of a compressor. A refrigerant circuit (10) has a compressor (21), an outdoor heat exchanger (23) functioning as a condenser, an indoor expansion valve (41, 51), an indoor heat exchanger (42, 52) functioning as an evaporator, connecting piping (4b, 5b) inside an indoor unit, a liquid refrigerant connecting pipe (6), a gas refrigerant connecting pipe (7), and connecting piping (8) inside an outdoor unit. A controlling section (9) performs liquefying control for causing the refrigerant to be present in a liquid state in a portion extending from the indoor expansion valve (41, 51) to the outdoor heat exchanger (23). Thecontrolling section (9) directly or indirectly controls the flow rate of the refrigerant flowing in a liquid bypass circuit (70) from a liquid pool section (Q) toward the gas refrigerant connecting pipe (7). A liquid surface sensor (39) detects at least either the volume of the liquid refrigerant in a portion where the liquid refrigerant pools or the physical quantity equivalent to the volume.

Description

technical field [0001] The present invention relates to an air conditioner and a method for judging the amount of refrigerant in a refrigerant circuit for judging whether it is appropriate or not. Background technique [0002] It is generally known that a heat source unit having a compressor and a heat source side heat exchanger and a utilization unit having a utilization side expansion valve and a utilization side heat exchanger are connected via a liquid refrigerant communication pipe and a gas refrigerant communication pipe. Air conditioning unit. In addition, determination of the amount of refrigerant in the refrigerant circuit of the air conditioner is performed by operating the air conditioner under predetermined conditions and detecting the degree of subcooling on the outlet side of the refrigerant in the heat source side heat exchanger. Operation under such conditions includes, for example, controlling the degree of superheat of the refrigerant at the outlet of the ...

Claims

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Application Information

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IPC IPC(8): F25B49/02F24F11/02
CPCF25B2400/13F25B13/00F25B2600/2509F25B2700/21152F25B2700/04F25B2500/19F25B2700/2115F25B2600/2501F25B49/005F25B2313/02741F25B2500/222
Inventor 西村忠史山口贵弘
Owner DAIKIN IND LTD
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