JPH031076A - Refrigerator - Google Patents

Abstract

PURPOSE:To prevent the inside of a glass tube from becomming highly humid condition after defrosting by a method wherein a defrosting heater is conducted for a give period of time after a predetermined period of time has elapsed from the reopenig time of cooling operation effected after finishing defrosting. CONSTITUTION:A defrosting heater 1 is constituted of a heater wire 3 arranged in a glass tube 2 while the glass tube 2 is sealded. When defrosting has become necessary, a compressor is stopped regardless of a temperature detecting signal to stop cooling operation (time point t1). At the same time, a relay 7 is put ON to conduct the defrosting heater 1. When the conduction of the defrosting heater 1 is intercepted, the compressor is started simultaneously and the cooling operation is reopened. When a predetermined period of time Ts has elapsed from the starting time point (t2) of the cooling operation, the defrosting heater 1 is conducted for a given period of time Tc to generate heat. Accordingly, the inside of the glass tube 2 becomes a high temperature and highly humid air, entered into the glass tube 2, is discharged to the outside of the tube 2. When the given period of time Tc has elapsed, the defrosting heater 1 is disconnected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a refrigerator equipped with a defrost heater made of a glass tube heater.

(Prior Art) Conventionally, some refrigerators are equipped with a glass tube heater as a heater for defrosting a cooler. As is well known, when defrosting is required, the compressor is stopped to stop the cooling operation, and the defrosting heater is energized to defrost the cooler. When defrosting is completed, the defrost heater is turned off and cooling operation is resumed. FIG. 3 shows a defrosting heater 1, which has a heater wire 3 passed through a glass tube 2, which is sealed. Both ends of the heater wire 3 are connected to lead wires 5 by crimp terminals 4, as shown in FIG.

(Problems to be Solved by the Invention) However, in the above-mentioned device, electrolytic corrosion occurs at the connection portion between the heater wire 3 and the lead wire 5, and there is a risk that the heater wire 3 may be disconnected. That is, during defrosting, the defrost heater 1 generates heat to thaw the frost in the cooler. As a result, the inside of the cooling room is brought into a high humidity state. When the defrosting is completed and the defrosting heater 1 is turned off and the cooling operation is restarted, the defrosting heater 1 which was in a high temperature state
As the inside of the glass tube 2 cools, it exhibits a breathing effect, and the highly humid air outside the glass tube 2 enters the glass tube 2 with a very small amount of air. If cooling operation continues as it is,
The inside of the glass tube 2 remains in a high humidity state, and electrolytic corrosion occurs at the dissimilar metal connection between the heater wire 3 and the lead wire 5.

Therefore, once defrosting is completed, cooling operation is restarted.
It is conceivable to let the defrost heater 1 generate heat for a certain period of time, but in this case, although the above-mentioned breathing action is stopped when the defrost heater 1 is in a heat generating state, the cooling by the cooler does not proceed and the inside of the cooling chamber is Since the temperature remains as high as before, the same result as described above will occur when the power is cut off after the defrosting heater 1 generates delayed heat.

The present invention has been made in view of the above circumstances, and its purpose is to provide a refrigerator that uses a glass tube heater as a defrosting device and is capable of preventing electrolytic corrosion at the connection portion of the glass tube heater. There is something to do.

[Configuration of the Invention] (Means for Solving the Problems) The present invention includes a defrosting heater made of a glass tube heater,
When defrosting is required, the cooling operation is stopped and the defrosting heater is energized to defrost the cooler, and when defrosting is completed, the defrosting heater is cut off and the cooling operation is restarted. The defrosting heater is characterized in that the defrosting heater is energized for a predetermined period of time after a predetermined period of time has elapsed from the time when the cooling operation was resumed.

(Function) When defrosting is completed, the inside of the cooling room is in a high humidity state. When C1 defrosting is completed and the defrosting heater is turned off and cooling operation is restarted, the inside of the glass tube of the defrosting heater, which was in a high temperature state, cools down and exhibits a breathing effect.
A very small amount of high-humidity air outside the glass tube enters the glass tube, but at this time, most of the moisture forms frost on the cooler during the cooling operation, and the humidity inside the cooling chamber decreases. In other words, the humidity in the cooling chamber decreases by the time a predetermined period of time has elapsed from the start of the cooling operation. After this predetermined period of time has elapsed, the defrost heater is energized for a certain period of time and generates heat, which raises the temperature inside the glass tube and causes a respiration effect in the opposite direction, such as the highly humid air that entered the glass tube exiting outside. exhibits.

This heater energization is stopped after a certain period of time. This stop causes a breathing effect in which the air outside the glass tube enters the inside, but by this time the humidity of the air outside the glass tube has already decreased due to the previous cooling operation, so the inside of the glass tube is high in humidity. It will never be.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

In this embodiment, a glass tube heater shown in FIG. 3 is provided as the defrosting heater 1. As described above, this defrosting heater 1 is constructed by passing the heater wire 3 through the glass tube 2, and the glass tube 2 is sealed. Both ends of the heater wire 3 are connected to lead wires 5 by crimp terminals 4, as shown in FIG. This defrosting heater 1 is provided near a cooler (not shown). As is well known, this cooler is used as compressor 6 (second
When the compressor 6 is energized (operated), the compressor 6 exhibits a cooling effect, and when the compressor 6 is deenergized (stopped), the cooling effect is stopped.

FIG. 2 shows an electrical control circuit for the defrost heater 1 and the compressor 6. As can be seen from the figure, the defrost heater 1 is energized by the relay 7, and the compressor 6 is energized by the relay 7. The power is turned off by 8.

This relay 7.8 is turned on and off by a control section 9 consisting of an electronic circuit. The control section 9 functions as follows.

During normal cooling operation, the compressor 6 is turned on and off by turning on and off the relay 8 based on a temperature detection signal from, for example, a freezer compartment temperature sensor, as shown in FIG. 1(a). This cooling operation causes frost to adhere to the cooler. However, when it becomes necessary to defrost (for example, when the accumulated operating time of the compressor 6 reaches a predetermined time), the compressor is turned off (in relation to the temperature detection signal) and the cooling operation is stopped (time 1+). The relay 7 is turned on to energize the defrosting heater 1. This will defrost the cooler. Then, the defrosting completion time (this is, for example, the detection signal output of the defrosting completion detection sensor force 1) At t) (time t2), the defrost heater 1 is cut off (determined by Indoor power (high humidity).

When the cooling operation is restarted, the internal force of the glass tube 2 of the defrosting heater 1, which was in a high temperature state (as it cools, it exhibits a breathing effect, and the high humidity air inside the glass tube 2 and outside the glass tube A very small force (1) enters the glass tube 2, but at this time, due to the cooling operation 1, the moisture outside the glass tube 2 (that is, the cooling chamber) forms frost on the cooler (1), and the humidity inside the cooling chamber gradually decreases. .

After this, the humidity in the cooling chamber becomes quite high, and when a predetermined time Ts has passed from the start of cooling operation (t2), the defrosting heater 1 is energized for a certain time Tc and generates heat. Internal force (exhibits a respiration effect in the opposite direction, such as the high-temperature, high-humidity air that entered the inside of the glass tube 2 exiting to the outside).

When the predetermined time Tc has elapsed, the defrosting heater 1 is turned off. This stop causes a breathing effect in which the air outside the glass tube 2 enters inside, but at this time the humidity of the air outside the glass tube 2 has already decreased due to the previous cooling operation, so the inside of the glass tube 2 does not have high humidity. Therefore, according to this embodiment, electrolytic corrosion can be effectively prevented from occurring at the connection portion between the heater wire 3 and the lead wire 5 of the defrosting heater 1.
Therefore, disconnection of the heater wire 3 can be prevented.

[Effects of the Invention] As is clear from the above description, the present invention is configured to energize the defrosting heater for a predetermined period of time after a predetermined period of time has elapsed from the time when the cooling operation is restarted upon completion of defrosting. It has excellent effects such as preventing high humidity inside the glass tube after defrosting the device, preventing electrolytic corrosion in the defrosting heater made of a glass tube heater, and preventing disconnection of the heater wire. play.

[Brief explanation of drawings]

Figures 1 to 4 show one embodiment of the present invention, Figure 1 is a time chart at the defrosting period, Figure 2 is a diagram showing the electrical configuration, and Figure 3 is a partially broken defrost heater. A side view, FIG. 4 is a side view of a connecting portion that connects one defrosting heater. In the diagram, 1 is the defrost heater, 2 is the glass tube, 3 is the heater wire, 5 is the lead wire, 6 is the compressor, 7° and 8 are the relays
9 is a control section. Figure 1

Claims (1)

[Claims] 1. A defrosting heater consisting of a glass tube heater is provided, and the cooling operation is stopped when defrosting is required, and the defrosting heater is energized to defrost the cooler, and when defrosting is completed, the defrosting heater is turned off. What is claimed is: 1. A refrigerator in which the defrosting heater is energized for a predetermined period of time after a predetermined period of time has elapsed from the time when the cooling operation was restarted.