JPH06147732A - Defrosting heater - Google Patents

Abstract

PURPOSE:To provide a defrosting heater in which the moisture having entered the inside of the heater does not collect at the two ends of the heater body. CONSTITUTION:The subject relates to a defrosting heater 7 which is energized when used for defrosting. At each of the two ends of the heater body 9 a cap 21 having a hole 19 through which a lead 17 is passed is provided. In this cap 21 an opening 23 which is open downward is formed as a means of discharging air and water from inside the heater body 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a cap in a defrosting heater.

[0002]

2. Description of the Related Art Generally, a refrigerator is known which is provided with a cooler for cooling the inside of a refrigerator and a defrosting heater provided below the cooler and energized during defrosting.

[0003] In this type, a rubber cap having lead wire lead-in holes is generally attached to both ends of the main body of the defrosting heater, and the inside of the heater is sealed with the cap (for example, for example). , Real fair 4-16152
issue).

[0004]

However, in the conventional configuration, when the heater is turned on and off, the air sealed inside the heater repeats thermal expansion and contraction, so that a breathing operation occurs and the air is trapped in the air. However, there is a problem that the water content and the water content transmitted through the lead wire enter the inside of the heater through the lead wire lead-in hole of the cap. When the infiltrated water accumulates at both ends of the heater body, rust is generated at the connecting portion between the lead wire and the heater wire, and when the rust progresses, there is a problem that finally the wire breaks.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art and to provide a defrosting heater in which moisture that has entered the inside of the heater is prevented from accumulating at both ends of the heater body. It is in.

[0006]

In order to achieve the above object, the present invention provides a defrosting heater that is energized during defrosting by providing caps having lead wire drawing holes at both ends of the heater body. It is characterized in that the cap is provided with a downward opening that also serves as air vent and water vent in the heater body.

[0007]

According to the present invention, even if the air in the heater body repeatedly expands and contracts repeatedly when the heater is turned on and off, the air flows in and out through the opening of the cap during that time. Movement is suppressed. Therefore, moisture does not enter through the lead-in hole. During this time, since the opening of the cap faces downward, water does not enter through the opening. Further, according to the present invention, even if water enters, the cap has the downward opening, so that the water is drained from the opening and does not accumulate on both ends of the heater body. Therefore, troubles such as breakage due to rust occurring at the connecting portion between the heater wire and the lead wire cannot occur.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a defrosting heater according to the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 indicates the inside of the refrigerator compartment. As is well known, the ice tray 3 is provided in the upper left part of the chamber 1.
However, the cooler 5 is arranged in the upper right part, and the defrosting heater 7 is arranged below the cooler 5.

The heater 7 constitutes an essential part of the present embodiment, and as shown in FIG. 2, the heater 7 has a heater body 9 made of a glass tube and a heater arranged in the heater body 9. The wire 11, the ring-shaped support 13 that supports the heater wire 11, the lead wire 17 that is connected to the heater wire 11 via the connection portion 15, and the lead-in hole 1 of the lead wire 17.
9 and a rubber cap 21 having a rubber cap 9. 2 shows the right half of the heater 7, and the left half is symmetrical.

The heater 7 is energized when defrosting the frost adhering to the cooler 5, and when it is turned on,
The frost in the cooler 5 is thawed by being heated to about 400 ° C.
As shown in Fig. 1, the drain water that has been thawed is drain pan 3
It is a mechanism in which it is collected in 1 and is led from here to an evaporation tray (not shown) through the drainage tube 33 to evaporate in the evaporation tray.

Thus, when the heater 7 is turned on, 400
Although it is heated to about 0 ° C., when it is turned off, it is cooled to about the same temperature as the cooler 5. When this is repeated, the air sealed inside the heater body 9 repeatedly undergoes thermal expansion and thermal contraction, and as a result, a breathing operation occurs in the heater body 9.

As described above, this breathing operation guides moisture in the air, moisture transmitted to the lead wire 17, etc. into the heater body 9 through the lead wire lead-in hole 19, as described above.
According to this embodiment, a device for suppressing the breathing motion is provided.

That is, referring to FIG. 2, a downward opening 23 is formed in the rubber cap 21 in addition to the lead wire drawing hole 19. The opening 23 is opened so that the end portion of the heater body 9 is located substantially at the center of the opening 23 when the cap 21 is attached to the heater body 9.

According to this, even if the air in the heater body 9 repeatedly undergoes thermal expansion and thermal contraction, during that time, the air is opened 23
Since the air comes in and goes out through, the breathing motion in the heater body 9 can be suppressed. When this operation is suppressed, infiltration of water through the lead wire drawing hole 19 is suppressed.

During this period, it is considered that water easily enters the heater body 9 through the opening 23. However, since the opening 23 faces downward, the opening 2 is actually formed.
Infiltration of water from 3 is suppressed. In any case, according to this embodiment, since the breathing operation inside the heater main body 9 is suppressed, the infiltration of water into the inside of the heater is greatly suppressed as compared with the conventional one.

Further, according to this embodiment, even if water enters, the cap 21 has the downward opening 23, so that the water is drained from there and collected at both ends of the heater body 9. There is no. Moreover, this opening 2
No. 3 is opened so that the end of the heater main body 9 is located substantially in the center of the opening 23. Therefore, not only the water on the heater main body 9 side but also the water on the cap 21 side is drained at the same time. It does not accumulate on both ends of the heater body 9.
Therefore, as in the conventional case, troubles such as generation of rust at the connecting portion 15 between the heater wire 11 and the lead wire 17 and progress of the rust and disconnection are eliminated.

Further, referring to FIG. 2, a rib 25 protruding in a ring shape is provided on the peripheral portion of the opening 23 of the cap 21. According to this, the water flowing through the heater body 9 is less likely to adhere to the peripheral portion of the opening 23, so that the water flowing out from the opening 23 is smoothly drained.

Further, referring to FIG. 3, the opening 23 is a long hole. According to this, since the surface tension is unlikely to occur around the opening 23, the water flowing out from the opening 23 is drained more smoothly.

[0020]

As is apparent from the above description, according to the present invention, caps having lead-in lead-in holes are provided at both ends of the heater body, and the caps face downward to serve both as air venting and water draining inside the heater body. Since the opening is provided, the breathing operation in the heater body is suppressed, and the infiltration of water through the lead wire drawing hole is suppressed. Also,
Even if water enters, it will be drained from the downward opening of the cap and will not be collected at both ends of the heater body.

[Brief description of drawings]

FIG. 1 is a front view showing a refrigerator compartment of a refrigerator.

FIG. 2 is a sectional view showing an embodiment of a defrosting heater according to the present invention.

FIG. 3 is a plan view showing the shape of a downward opening provided in the cap.

[Explanation of symbols]

 7 Heater 9 Heater main body 11 Heater wire 15 Connection part 17 Lead wire 19 Lead wire lead-in hole 21 Cap 23 Opening 25 Rib

Claims (1)

[Claims] 1. A defrosting heater which is energized during defrosting, is provided with caps having lead-in lead-in holes at both ends of the heater body, and the cap has a downward opening that also serves as air vent and water drainage inside the heater body The defrosting heater is characterized by being provided with.