JPH01230973A - Indication method of defroster in fridge - Google Patents

Abstract

PURPOSE:To prevent an abnormal rise in the indication of temperature in a fridge during defrosting operation so as to avoid user's unnecessary anxiety, by turning off 'defrost' indication after starting a compressor and an indoor fan in sequence after stopping heating by a defrost-heating device by 'defrost completion' signal. CONSTITUTION:In case defrosting operation is carried out at a specified intervals, 'defrost start' signal is issued by a timer, a compressor and an indoor fan are stopped by switching off their electric circuits, and simultaneously the electric circuits for a defrost heater and 'defrost' indication lamp are switched on to start heating and to turn on the indication lamp as well. When the temperature of a cooler rises by heating and a thermostat detects that the temperature reaches a specified one, the electric circuit for the heater is instantly switched off to stop heating. The compressor is started to cool the cooler a few minutes after a timer is actuated by 'defrost completion' signal. A few minutes after the compressor is started, the indoor fan is started to demolish local high temperature around the cooler by agitating the air in the fridge. Therefore, the temperature in the fridge indicated on an indicator begins to fall from this time. About one minute after the indoor fan is started, 'defrost' indication lamp is turned off.

Description

DETAILED DESCRIPTION OF THE INVENTION a. Field of Industrial Application The present invention relates to a refrigerator or a freezer, and particularly to a defrost display method for a refrigerator or freezer having an internal temperature display means.

b. Prior Art Conventionally, when frost forms on a cooler in a refrigerator or freezer, the frost is removed by heating using a defrosting heating means such as a heater method or a hot gas method.

The refrigerator or freezer (hereinafter referred to as "refrigerator") that is being defrosted is equipped with an indicator lamp consisting of a light emitting diode (LED) or a neon lamp to indicate that defrosting is in progress. There is.

FIGS. 3 and 4 show a timing chart and a time series of the display indicating that the refrigerator is being defrosted, that is, the lighting of the display lamp for displaying the defrost display.

In normal cooling operation of a refrigerator, the operation of the compressor is controlled according to the required temperature inside the refrigerator. That is, the compressor is operated under on-off control so as to maintain the internal temperature at a necessary constant temperature.

Furthermore, the internal fan is operated continuously.

The start of defrosting is performed at fixed time intervals or by a signal from a frost detection sensor, and if such a defrost start signal is input now, the electrical circuits of the compressor and internal fan will be turned off. The circuit of the heater, which is the defrosting heating means, is turned on (in the case of hot gas, the electric circuit that opens and closes the solenoid valve that controls the cooling circuit is turned on), indicating that defrosting is in progress. The indicator lamp lights up.

When the temperature of the cooler increases and reaches a certain temperature (the frost melts), it is detected by a sensor such as a thermostat, and the heater circuit is turned off by the signal, that is, the defrosting end signal, and the defrosting is completed. heating will be completed. After a few minutes, the electric circuit for operating the compressor is turned on and the compressor is started, and at the same time, the indicator lamp indicating that defrosting is in progress goes out and the defrosting display is also stopped.

After a few more minutes, the electric circuit for the internal fan is turned on again and the internal fan is activated.

C8 Problems to be Solved by the Invention Conventional refrigerators have so-called internal temperature display means, in which a temperature sensor (for example, a remote alcohol thermometer) is set inside the refrigerator, and an internal temperature display section is provided outside the refrigerator. In these refrigerators, the indicator lamp lights up in response to the defrost start signal, and after heating is performed by the defrost heater, the indicator lamp is turned off when the compressor starts.
The circuit was set up so that the internal fan would then be turned on.

In such refrigerators, the temperature sensor inside the refrigerator is often set near the cooler, and as the temperature of the cooler increases, the temperature displayed on the inside temperature display also rises.

In such a case, the user can understand the cause if the indicator lamp indicating that defrosting is in progress is lit.
If the defrost indicator lamp is turned off at the same time as the compressor starts after defrosting, the temperature inside the refrigerator is actually high in the area where the temperature sensor is located (the temperature in the center of the refrigerator and the temperature of stored items is high). This partially high temperature will not go down unless the internal fan rotates after the compressor starts, so even if the defrost indicator lamp goes out and cooling operation is in progress, the internal temperature will not be displayed. There is a problem in that the displayed temperature is abnormally high, giving the user an unnecessary sense of anxiety (anxiety that the refrigerator may be malfunctioning).

The present invention has been made to solve these problems, and while the internal temperature display is displaying a high temperature due to heating by the defrost heating means, the defrost display indicating that defrosting is in progress is not performed. The purpose of this invention is to provide a method for displaying defrost on a refrigerator.

88 Means for Solving the Problems In order to achieve the above object, the present invention provides a defrost display method for a refrigerator having an internal temperature display means, in which heating by the defrost heating means is stopped in response to a defrost end signal. The device starts the compressor, then starts the fan in the refrigerator, and stops the defrost display on the top.

e. Operation In response to the defrost end signal, the compressor is started while stopping the heating by the defrost heating means, and then the internal fan is started,
After that, the defrost display is stopped, so while the internal temperature display is showing a high temperature due to the heating by the defrost heating means, the defrost display is displayed to indicate that defrosting is in progress. The defrost display is stopped after the internal temperature of the part where the temperature sensor is located drops and the temperature displayed on the internal temperature display drops.

f. EXAMPLE The present invention will be explained in detail below using the timing charts and time series machines shown in FIGS. 1 and 2.

During normal cooling operation, the compressor is operated under on-off control to maintain the inside of the refrigerator at a constant temperature, and the fan in the refrigerator is continuously operated.

Now, if defrosting is performed at time intervals, the timer will issue a defrost start signal, the electric circuits of the compressor and internal fan will be turned off and stopped, and the electric circuits of the defrost heater and indicator lamp will be turned off. The indicator lamp lights up at the same time as it turns on and heats up.

The temperature of the cooler increases due to heating, and the thermostat indicates that the temperature has reached the fixed temperature (+25℃ between the cooler fins in the case of heater heating, +3℃ at the cooler outlet in the case of hot gas). When detected, the heater's electrical circuit is immediately turned off and heating ends. The timer is activated by this heating end signal, that is, the defrosting end signal, and a few minutes later, the compressor is started to cool the cooler. A few minutes after the compressor is started, the fan inside the refrigerator will rotate and agitate the air inside the refrigerator to eliminate localized high temperature areas near the cooler. Therefore, at this point, the temperature displayed on the refrigerator temperature display will also start to drop. . Turn off the indicator lamp approximately 1 minute after the internal fan starts rotating. At this time, the temperature displayed on the inside temperature display has also dropped to the normal temperature.

In addition, to turn off the indicator lamp, instead of operating a timer, a sensor of the refrigerator temperature display means is used, and when the sensor detects a certain temperature (a temperature close to the required temperature in the refrigerator), the defrost indicator lamp is turned on. A similar effect can be obtained even when the lights are turned off.

Further, the display is not limited to a lamp, and any known display means can be used.

Further, the time from the rotation of the internal fan to the extinguishing of the indicator lamp is required to be at least several tens of seconds, although it differs depending on the sensor of the internal temperature means or the degree of π.

g1 Effects of the Invention According to the method of the present invention, in response to the defrost end signal, heating by the defrost heating means is stopped, the compressor is started, then the internal fan is started, and then the defrost display is stopped. As a result, the defrost display is not displayed (despite this, the temperature displayed on the refrigerator temperature display is not high, and
This has the effect of not giving the user a sense of anxiety or disbelief that the refrigerator may be malfunctioning.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a timing chart showing an embodiment of the method of the present invention, FIG. 2 is an explanatory diagram also showing a time series, and FIG.
The figure shows a timing chart of the conventional method, and FIG. 4 is an explanatory diagram showing the time series of the same conventional method.

Claims (1)

[Claims] In a defrost display method for a refrigerator having an internal temperature display means, in response to a defrost end signal, the heating by the defrost heating means is stopped, the compressor is started, the internal fan is started, and then the defrost is started. A defrost display method in a refrigerator characterized by stopping the display.