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Air conditioner and defrosting operation method therefor

An air conditioner, a technology in operation, applied in the directions of refrigerators, compressors, heating methods, etc., can solve the problems such as the decline of the heat exchange performance of the outdoor heat exchanger and the inability to obtain sufficient heating capacity, and achieve the goal of suppressing the reduction of the total heating capacity. Effect

Active Publication Date: 2017-02-22
HITACHI JOHNSON CONTROLS AIR CONDITIONING INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If frost blocks the ventilation path between the fins in the outdoor heat exchanger, the heat exchange performance of the outdoor heat exchanger will decrease, and sufficient heating capacity will not be obtained.

Method used

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  • Air conditioner and defrosting operation method therefor
  • Air conditioner and defrosting operation method therefor
  • Air conditioner and defrosting operation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] pass figure 1 as well as figure 2 Examples of the present invention will be described. figure 1 Showing the refrigerating cycle structure diagram (refrigerant circuit diagram) of Embodiment 1 of the air conditioner of the present invention, figure 2 It is a flowchart showing the control operation of the defrosting operation in the first embodiment.

[0031] First, use figure 1 The structure of the air conditioner of the first embodiment will be described.

[0032] The air conditioner is composed of an outdoor unit (outdoor unit) 1 and an indoor unit (indoor unit) 2 connected to the outdoor unit 1 through refrigerant pipes 11 and 12 (11: gas pipe, 12: liquid pipe).

[0033] The outdoor unit 1 is composed of the following parts: a compressor 3 composed of a scroll compressor, etc., a four-way valve 4, an outdoor heat exchanger (heat source side heat exchanger) 5, and an electronic valve with a variable throttle opening. An outdoor expansion valve 6 composed of an e...

Embodiment 2

[0059] pass image 3 Embodiment 2 of the present invention will be described. image 3 It is a flowchart showing the control operation of the defrosting operation in the second embodiment. In addition, the structure of the air conditioner is the same as figure 1 same, refer to figure 1 Embodiment 2 will be described.

[0060] exist image 3 In, for steps S0, S1, S4~S7, because figure 2 The contents shown are the same, so their explanations are omitted.

[0061] This embodiment 2 is to figure 2 For more specific examples of steps S2 and S3 in image 3 In step S8, the power ratio of the outdoor air blower 13 before and after frosting on the outdoor heat exchanger 5 is obtained, and the power ratio is used to perform figure 2 The detection of the frosting amount in step S2.

[0062] By detecting the electric current flowing in the motor of the outdoor blower 13, the electric power (power consumption) of the outdoor blower 13 can be calculated|required from the followi...

Embodiment 3

[0075] pass Figure 4 Embodiment 3 of the present invention will be described. Figure 4 It is a flowchart showing the control operation of the defrosting operation in the third embodiment. In addition, the structure of the air conditioner in this embodiment is the same as figure 1 same, refer to figure 1 Embodiment 3 will be described.

[0076] exist Figure 4 In this embodiment, steps S0, S1, S4~S7 are related to figure 2 The contents shown are the same, so their explanations are omitted.

[0077] This embodiment 3 also will figure 2 For more specific examples of steps S2 and S3 in Figure 4 In step S11, the temperature of the outdoor heat exchanger 5 is detected by the heat exchanger temperature thermistor 15, and the temperature is used to perform figure 2 The detection of frosting amount in step S2.

[0078] That is, since the heat exchange efficiency falls when frost adheres to the outdoor heat exchanger 5, the number of rotations of the compressor 3 increase...

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Abstract

An air conditioner in which a refrigeration cycle is configured by connecting a compressor, a four-way valve, a use-side heat exchanger, an expansion valve, and a heat-source-side heat exchanger. The air conditioner is also provided with: a hot gas bypass circuit that is connected between the discharge side of the compressor and in between the heat-source-side heat exchanger and the expansion valve; an on-off valve that opens / closes the flow path of the hot gas bypass circuit; and a control device that performs control such that either hot gas bypass defrosting operation or inverse cycle defrosting operation is selected according to the amount of frost formation on the heat-source-side heat exchanger, thereby performing defrosting operation. The control device, in the case of executing the hot gas bypass defrosting operation, performs control such that the on-off valve of the hot gas bypass circuit is opened, thereby partially supplying the refrigerant discharged from the compressor to the heat-source-side heat exchanger through the hot gas bypass circuit, and in the case of executing the inverse cycle defrosting operation, performs control to switch the four-way valve so that the refrigerant discharged from the compressor is supplied to the heat-source-side heat exchanger after passing through the four-way valve.

Description

technical field [0001] The invention relates to an air conditioner performing defrosting operation and a defrosting operation method thereof. Background technique [0002] When the heat pump type air conditioner is operated for heating, frost may form on the surface of the outdoor heat exchanger (heat source side heat exchanger). If the frost blocks the ventilation passages between the fins in the outdoor heat exchanger, the heat exchange performance of the outdoor heat exchanger will decrease, and sufficient heating capacity will not be obtained. Therefore, it is necessary to periodically determine the frosting state of the outdoor heat exchanger and defrost it. [0003] As a method of defrosting, there are known reverse cycle defrosting operation in which the four-way valve is switched to the cooling operation side to perform defrosting, and a hot gas bypass circuit that bypasses the discharge side of the compressor and has an on-off valve. The circuit is connected to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24F11/02
CPCF24F11/89F25B47/022F25B47/025F25B49/02F25B2313/0294F25B2700/11F25B2700/1933F25B2700/2117F25B2347/021F25B2700/15
Inventor 谷和彦内藤宏治持田辰弥浦田和干秋山义幸稻叶雅美
Owner HITACHI JOHNSON CONTROLS AIR CONDITIONING INC
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