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Freezing apparatus

A refrigeration device and refrigerant technology, which is applied in the field of expansion valve control, can solve problems such as instability, superheat control cannot be performed well, and superheat control cannot be performed, so as to achieve the effect of improving control performance

Active Publication Date: 2010-03-31
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the outlet temperature of the evaporator drops too much, and the refrigerant at the outlet of the evaporator changes from a superheated state to a wet state, the temperature at the outlet of the evaporator becomes unstable due to the influence of refrigerant droplets. The above superheat control can not be carried out well
[0007] Therefore, if the opening of the electric expansion valve is adjusted to suppress the peak, the controller may not be able to perform good superheat control when the target superheat is set higher than the current one.

Method used

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Embodiment Construction

[0064] Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

[0065] Such as figure 1 As shown, the air conditioner 10 of this embodiment includes a refrigerant circuit 20 and a controller 38 .

[0066] The refrigerant circuit 20 is filled with carbon dioxide (CO 2 ) closed loop. The refrigerant circuit 20 is configured to circulate a refrigerant to perform a vapor compression refrigeration cycle. In addition, the refrigerant circuit 20 is configured to perform a supercritical refrigeration cycle (that is, a refrigeration cycle including a vapor pressure region above the critical temperature of carbon dioxide) at a high pressure set to a value equal to or higher than the critical pressure of carbon dioxide.

[0067] The refrigerant circuit 20 is connected with a compressor 21, a four-way reversing valve 22, an outdoor heat exchanger 23, an outdoor expansion valve 24, a liquid receiver 25 (receiver 25), an indoor expansion val...

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PUM

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Abstract

Provided is a freezing apparatus comprising an overheat control unit (44) constituted to adjust the opening of an indoor expansion valve (26) on the basis of a control gain for deciding the opening operation stroke of the indoor expansion valve (26). The overheat control unit (44) includes a control gain deciding unit (41) for setting the control gain (g) higher than the current level, when a target overheat deciding unit (39) makes a target overheat (SHs) higher than the current level, and lower than the current level, when the target overheat (SHs) is made lower than the current level.

Description

technical field [0001] The invention relates to a control technology of an expansion valve arranged in a refrigeration device. Background technique [0002] Heretofore, refrigerating apparatuses including a refrigerant circuit that circulates a refrigerant to perform a refrigerating cycle are known. Also, one of the methods of controlling the operation of the refrigeration device is, for example, superheat degree control using an electric expansion valve disclosed in Patent Document 1. [0003] The degree of superheat control is to adjust the opening degree of the electric expansion valve so that the degree of superheat obtained from the evaporator outlet temperature of the refrigerant actually measured in the refrigerant circuit (hereinafter referred to as the detected degree of superheat) becomes the target degree of superheat. Generally, when a plurality of evaporators are provided in the refrigerant circuit, the superheat degree control is used for capacity control of e...

Claims

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Application Information

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IPC IPC(8): F25B1/00
CPCF25B2313/005F25B13/00F25B2600/2513F25B2313/0314F25B49/02F25B2700/1933F25B2313/0233F25B2600/21F25B2313/02741
Inventor 笠原伸一冈本哲也
Owner DAIKIN IND LTD
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