Air-conditioner

A technology of air conditioners and heat exchangers, applied in space heating and ventilation, heating methods, lighting and heating equipment, etc., can solve problems such as uneven distribution of wind speed, increased noise, and slow wind speed

Inactive Publication Date: 2008-03-05
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Compared with the outdoor unit with two fans arranged up and down in the front and forming a blowing circuit, this structure has an uneven distribution of wind speed because the air flow is blown upwards and there is only one fan. The wind speed is faster at the position, and the wind speed becomes slower at the position away from the fan. Therefore, the heat exchanger located at a distance below the fan may have insufficient heat exchange function
In this way, in order to achieve the same heat exchange capacity as the outdoor unit that blows air forward, it is necessary to increase the size of the heat exchanger or increase the rotation speed of the fan, but this will cause the problems of larger body size and increased noise.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0037] Fig. 1 is a schematic structural diagram of an outdoor unit in an embodiment of the present invention, in which a multi-flow air conditioner for a building is used as an example for illustration. Fig. 2 is a schematic diagram of the refrigeration cycle system in the present invention.

[0038] The refrigeration cycle system in FIG. 2 includes: a compressor 1 with adjustable power, a four-way valve 2 for switching between heating operation and cooling operation, an outdoor heat exchanger 3 , and an outdoor fan 4 . Wherein, the outdoor heat exchanger 3 is further divided into upper and lower parts, and is respectively provided with an outdoor upper expansion valve 5, an outdoor lower expansion valve 6, an outlet temperature sensor 7 at the upper part of the outdoor heat exchanger, and a lower part of the outdoor heat exchanger. Outlet temperature sensor 8.

[0039] Expansion valves 5 and 6 are driven by stepping motors operated under the control of pulse signals, and the...

Embodiment 2

[0046] Fig. 5 and Fig. 6 are the control flowchart of the air conditioner in the second embodiment of the present invention and the timing chart of the control process.

[0047] After the power is turned on, in step S001 the upper and lower expansion valves are initialized to be fully open. Next, if the heating operation is entered in step S002, then according to the difference between the initial indoor temperature and the target indoor temperature in step S003, the compressor frequency and the target discharge temperature are determined in step S004; After each expansion valve is opened up or down for the same number of pulses, it enters the target exhaust temperature control process. The specific control process is: in step S006, the difference ΔTd between the target exhaust temperature and the current exhaust temperature is detected; in step S007, when it is determined that the current exhaust temperature is lower than the target specified value ΔT1, then proceed to step S...

Embodiment 3

[0050] Fig. 7 and Fig. 8 are the control flowchart of the air conditioner in the third embodiment of the present invention and the timing chart of the control process.

[0051] After the power is turned on, firstly, in step S001, the upper and lower expansion valves are initialized to be fully open. Next, if the heating operation is entered in step S002, the compressor frequency and the target discharge temperature are determined in step S004 according to the difference between the initial indoor temperature and the target indoor temperature in step S003; then, in step S005 After the upper and lower expansion valves are opened up or down for the same number of pulses, the target exhaust temperature control process is entered. The specific operation process of this control process is as follows. In step S006, the difference ΔTd between the target exhaust temperature and the current exhaust temperature is detected; if it is determined in step S007 that the current exhaust tempe...

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PUM

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Abstract

The invention provides an air conditioner, capable of maintaining the best state of refrigeration cycle only through the control of the expansion valve. The distribution of the speed of the air current through an outdoor lateral heat exchanger is uneven, and as the flux of the refrigerant in the refrigerant flow is imbalanced and uneven under the influence of the altimeter head of the refrigerant flow, the heat exchange capacity can not be fully realized. In order to improve the adjusting ability, it is necessary to increase the size of the heat exchanger, resulting in problems of increased manufacturing costs, increased fan speed and louder noises. The outdoor heat exchanger of the invention is divided into separate parts respectively provided with expansion valves (5), (6) and heat exchangers (7), (8) at the discharging port of the outdoor heat exchanger, which respectively control the circulating volume of the refrigerant, capable of quickly stabilizing the refrigeration cycle and maximize the function of the heat exchanger.

Description

technical field [0001] The present invention relates to an air conditioner which maintains an optimum refrigerating cycle state by controlling an expansion valve. Background technique [0002] As shown in the control flow diagram in Figure 13, the control timing diagram in Figure 14, and the block diagram in Figure 15, the existing air conditioners generally set the operating frequency of the compressor and the target discharge rate according to the difference between the initial indoor temperature and the target indoor temperature. The initial value of the gas temperature, and then by adjusting the opening of the expansion valve to maintain the best refrigeration cycle state. If there is a deviation between the actual discharge temperature of the compressor and the target discharge temperature, the opening of the expansion valve is corrected to control the convergence to the target value (for an example, refer to Japanese Patent Publication No. 2001-12808 No). [0003] Ho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F24F11/02F25B49/02
CPCF25B2400/22
Inventor 武内裕幸
Owner PANASONIC CORP
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