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air conditioner

A technology for air conditioning and control devices, applied in air conditioning systems, high-efficiency conditioning technology, climate sustainability, etc., can solve problems such as the decrease in refrigerant leakage rate, and achieve the effect of reducing refrigerant leakage

Active Publication Date: 2021-12-14
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In Patent Document 1, when the refrigerant leaks from the indoor unit, the pressure difference between the refrigerant pressure of the indoor unit and the atmospheric pressure of the indoor space is reduced to reduce the refrigerant leakage rate.

Method used

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Examples

Experimental program
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Effect test

Embodiment approach 1

[0028] [air conditioner]

[0029] figure 1 It is a figure which schematically shows an example of the circuit structure of the air-conditioning apparatus concerning Embodiment 1 of this invention. In Embodiment 1, the air conditioner 100 has a refrigerant circuit 101 that connects the outdoor unit 1 and the two indoor units 2a and 2b by using the liquid main pipe 3, the gas main pipe 4, the liquid branch pipe 5, and the gas branch pipe 6. connected to form. In addition, the air conditioner 100 includes a control device 90 , and performs normal operations such as cooling operation mode and heating operation mode, leakage reduction operation, and the like.

[0030] Each liquid branch pipe 5 connects the liquid main pipe 3 to each indoor unit 2a, 2b, and each gas branch pipe 6 connects the gas main pipe 4 to each indoor unit 2a, 2b. Hereinafter, in the refrigerant circuit 101, the circuit of the outdoor unit 1 is referred to as a heat source side circuit, and the liquid main p...

Embodiment approach 2

[0108] Figure 10 It is a figure which schematically shows an example of the circuit structure of the air-conditioning apparatus concerning Embodiment 2 of this invention. In addition, in Figure 10 In the air-conditioning device 200, the pair has the same figure 1 Portions with the same configuration in the air-conditioning apparatus 100 are denoted by the same reference numerals, and description thereof will be omitted. The configuration of the outdoor unit 1 of the air-conditioning apparatus 200 according to the second embodiment is different from that of the first embodiment. In Embodiment 2, the outdoor unit 1 includes the check valve 17 in the piping 103 between the flow path switching device 11 and the accumulator 13 .

[0109] The outflow suppression operation in Embodiment 2 will be described. In addition, the refrigerant recovery operation and the refrigerant transfer operation in the second embodiment are the same as those in the first embodiment.

[0110] [Out...

Embodiment approach 3

[0116] Figure 11 It is a figure which schematically shows an example of the circuit structure of the air-conditioning apparatus concerning Embodiment 3 of this invention. In addition, in Figure 11 In the air conditioning unit 300, the pair has the same figure 1 Portions with the same configuration in the air-conditioning apparatus 100 are denoted by the same reference numerals, and description thereof will be omitted. The configuration of the outdoor unit 1 of the air-conditioning apparatus 300 according to the third embodiment is different from that of the first embodiment. In Embodiment 3, the outdoor unit 1 is provided with the second shutoff device 18 a in the piping 104 between the gas main pipe 4 and the flow switching device 11 .

[0117] The outflow suppression operation of Embodiment 3 will be described. In addition, the refrigerant recovery operation and the refrigerant transfer operation in the third embodiment are the same as those in the first embodiment.

...

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Abstract

The air conditioner (100) includes: a refrigeration cycle (10, 11, 12, 20, 21), and a first shutoff device (15) installed in a pipe connecting the heat source side heat exchanger (12) and the throttling device (20). ), a refrigerant leakage detection device (83a, 83b) and a control device (90). The control device controls the flow path switching device (11) to switch between a first connection state and a second connection state in which the discharge side of the compressor (10) is connected to the heat source side heat exchanger, and in the second connection state In the second connection state, the suction side of the compressor is connected to the heat source side heat exchanger via the accumulator (13). In addition, the control device executes the refrigerant recovery operation and the refrigerant transfer operation when refrigerant leakage is detected. During the refrigerant recovery operation, the control device controls to close the first cut-off device, sets the flow path switching device to the first connection state, and drives the compressor, and controls to turn the flow path switching device to the first connection state during the refrigerant moving operation. In the second connection state, stop the compressor.

Description

technical field [0001] The present invention relates to an air-conditioning device in which refrigerant circulates in a refrigeration cycle, and reduces leakage of refrigerant into a room. Background technique [0002] Conventionally, an air conditioner is known, which includes a refrigerant circuit connecting an outdoor unit and a plurality of indoor units, and a refrigerant leakage detection device for detecting leakage of refrigerant from the indoor units. The refrigerant in the indoor circuit is circulated to a low pressure (for example, refer to Patent Document 1). In Patent Document 1, when the refrigerant leaks from the indoor unit, the pressure difference between the refrigerant pressure of the indoor unit and the atmospheric pressure of the indoor space is reduced to reduce the refrigerant leakage rate. Specifically, control such as throttling the opening degree of the expansion valve between the outdoor heat exchanger and the indoor heat exchanger is performed. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B49/02F25B1/00F25B13/00F25B41/20
CPCF25B13/00F25B49/02F25B2313/02741F25B2600/0251F25B2313/006F25B2600/0253F25B2500/22F25B2600/11F25B2600/2507F25B2600/2513F25B2600/2519F25B2700/1931F25B2700/1933F25B2400/19F25B49/005F25B2313/0233F24F11/36F24F11/84F24F11/86F25B41/22F25B41/20Y02B30/70F25B41/24F24F3/06
Inventor 池田宗史西尾淳石村亮宗小仓康平山下浩司
Owner MITSUBISHI ELECTRIC CORP
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