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Air conditioner

A technology for air conditioners and outdoor heat exchangers, applied in air conditioning systems, space heating and ventilation, heating methods, etc. The effect of prolonging life

Inactive Publication Date: 2008-09-03
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the throttling device is a capillary fixed-frequency system, the negative pressure is reduced by controlling the outdoor fan. The specific method is to control the start and stop of the outdoor fan (for example, the outdoor fan runs for a period of 4 seconds, of which it starts for 3 seconds and stops. 1 second) to increase the high pressure, drive the low pressure to rise, and reduce the occurrence of negative pressure, but once the negative pressure occurs, the compressor may start and stop several times in a row, and cannot return to normal operation quickly, thus affecting the system run

Method used

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Experimental program
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Effect test

no. 1 approach

[0026] exist figure 2 Among them, Ps represents the suction side pressure of the compressor, and Ps 0 Indicates the lower limit of low pressure, n indicates the number of abnormal low pressure of the compressor, n set Indicates the maximum number of low pressure abnormalities of the compressor set by the system, t x Indicates the set time for the control device to judge whether a low pressure abnormality occurs during startup, t c Indicates the standby time when the compressor and the outdoor fan stop at the same time, t n Indicates the delay start time of the outdoor fan when the nth low-pressure abnormality occurs in the compressor, To indicates the outdoor air temperature, and Te indicates the outdoor heat exchanger temperature.

[0027] like figure 2 As shown, when the air conditioner is turned on, the compressor and the outdoor fan start at the same time, at this time n=0, that is, the compressor does not have low-pressure abnormality; when the compressor and the ou...

no. 2 approach

[0047] Figure 4 The symbol shown and figure 2 Same as shown except t n In this embodiment, it shows the low-speed startup time of the outdoor fan when the nth low-pressure abnormality occurs in the compressor.

[0048] Such as Figure 4 As shown, when the air conditioner is turned on, the compressor and the outdoor fan start at the same time, at this time n=0, that is, the compressor does not have low-pressure abnormality; when the compressor and the outdoor fan are started at the same time, the low-pressure detection device detects the pressure on the low-pressure side , and transmit the pressure signal to the control device.

[0049] When Ps≥Ps 0 , after transmitting the pressure signal to the control device, the control device uses the tx time to judge whether a low pressure abnormality occurs, if it is judged that there is no low pressure abnormality, the compressor and the outdoor fan start normally (continue to run), and n=0 at this time; If the control device det...

no. 3 approach

[0068] In Figure 6a and Figure 6b, the delayed start time (or low speed start time) of the outdoor fan can be calculated according to the empirical formula t n = t n-1 ×α×β×γ to calculate, where t n-1 Indicates the delayed start time (or low-speed start time) of the outdoor fan when the compressor has the n-1th low-pressure abnormality, t n Indicates the delayed start time (or low-speed start time) of the outdoor fan when the compressor has the nth low-pressure abnormality, where t n >t n-1 , t n-1 ≥0; α represents the correction coefficient of the outdoor air temperature to the delayed start time (or low-speed start-up time) of the outdoor fan; β represents the correction coefficient of the outdoor heat exchanger temperature to the delayed start-up time (or low-speed start-up time) of the outdoor fan; γ Represents a constant greater than 1; To represents the outdoor air temperature; Te represents the temperature of the outdoor heat exchanger.

[0069] As shown in Figure ...

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Abstract

The invention provides an air conditioner comprising an indoor set and an outdoor set. The indoor set at least comprises an indoor heat exchanger, and the outdoor set at least comprises a compressor, an outdoor heat exchanger, a throttling device, an outdoor fan used for the outdoor heat exchanger, and a low pressure detection device at the inhalation side of the compressor, wherein a control device controlling at least the compressor and the outdoor fan is disposed in the outdoor set, stops the compressor when low pressure abnormality is detected by the low pressure detection device during the operation process of the air conditioner, and controls start of the outdoor fan at the same time according to times of low pressure generation of the compressor. The inventive air conditioner facilitates protection of the compressor, elongates life of the compressor and assures normal operation of the air conditioner.

Description

technical field [0001] The invention relates to an air conditioner, in particular to an air conditioner capable of reducing negative pressure during low-temperature refrigeration. Background technique [0002] Existing air conditioner comprises indoor unit and outdoor unit, and described indoor unit comprises indoor heat exchanger (evaporator) at least, and described outdoor unit comprises compressor, outdoor heat exchanger (condenser) and throttling device at least, so The compressor, outdoor heat exchanger, throttling device and indoor heat exchanger are connected through connecting pipes to form a basic refrigeration cycle. [0003] When the external ambient temperature is relatively low or the internal and external connecting pipes are long, it is easy to generate negative pressure during "cooling" operation. In order to reduce the occurrence of negative pressure, the throttling device can be improved. [0004] The throttling device can use an electromagnetic expansion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24F1/00F24F11/00
Inventor 葛标张辛航顾介明
Owner PANASONIC CORP
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