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Air conditioner and its control method

A control method and air-conditioning technology, applied in heating and ventilation control systems, refrigerators, heating methods, etc., can solve problems such as complex control processes, unstable refrigeration cycles, and inability to prevent oscillations.

Inactive Publication Date: 2005-11-30
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0013] However, in the conventional configuration described above, it is impossible in principle to eliminate oscillation by controlling the expansion valve through closed loop control using the suction temperature of the compressor, which is greatly affected by the opening degree from the expansion valve.
In other words, effective at converging extreme oscillations, but not preventing certain degrees of oscillation
In addition, it takes a long time until the expansion valve is stabilized at the optimum value, and during this period, instability in the refrigeration cycle cannot be avoided, so there are problems such as the need to adopt a complicated control process.

Method used

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  • Air conditioner and its control method

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Embodiment Construction

[0023] Embodiments of the present invention will be described below with reference to the drawings.

[0024] Fig. 1 is a schematic block diagram of a control system of an air conditioner in an embodiment of the present invention. In Figure 1 for the Figure 5 The same symbols are used for the same constituent elements in , and their descriptions are omitted. In addition, the refrigeration cycle here is the same as Figure 4 have the same composition.

[0025] The indoor unit control unit 6 in FIG. 1 retrieves signals from the indoor temperature sensor 8 and the like, and controls the indoor blower fan 10 and the like. The indoor temperature, the speed information of the indoor blower fan, and other necessary information are output from the indoor control unit 6 to the outdoor unit control unit 71 .

[0026] The outdoor control unit 71 uses the indoor temperature and other data output by the indoor control unit 6 and the outdoor temperature sensor installed on the outdoor un...

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Abstract

To determine the proper throttle amount without performing the feedback control, and to stabilize a refrigerating cycle in controlling an electronic expansion valve of an air conditioner. The optimum throttle valve opening to maximize the evaporator heat exchanging efficiency is calculated in a calculation block 71 on the basis of a calculating formula determined in advance by the experiment on the basis of an indoor temperature, an outdoor temperature, an indoor fan speed and a rotating frequency of a compressor 1, to control the electronic expansion valve 5.

Description

technical field [0001] The invention relates to a method for controlling the opening degree of an electronic expansion valve constituting a frequency conversion air conditioner refrigeration cycle and an air conditioner using the method. Background technique [0002] Generally, air conditioners consist of Figure 4 The refrigeration cycle composed of the compressor 1, the four-way valve 2, the indoor heat exchanger 3, the outdoor heat exchanger 4 and the electronic expansion valve 5 is constituted. When this air conditioner is in cooling operation, by controlling the four-way valve 2, the cooling medium flows back to the room from the indoor heat exchanger 3 in the order of the compressor 1, the outdoor heat exchanger 4, and the electronic expansion valve 5 as indicated by the dotted arrow. heat exchanger 3. In this way, the indoor heat exchanger 3 is made to absorb surrounding heat as an evaporator. On the other hand, the rotation of the indoor fan is controlled according...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F24F11/02F25B1/00F25B49/02
CPCY02B30/741F25B2600/021Y02B30/70
Inventor 山田吉人大泷镇雄
Owner PANASONIC CORP
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