JPH1151548A - Defrosting heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a defrosting heater in which water intruded into the heater is prevented from standing at the opposite ends of a heater body. SOLUTION: The defrosting heater 7 is provided, at the opposite ends of the heater body 9, with caps 21 having a hole 19 for drawing in a lead wire 17 and the cap 21 is provided with an opening 23 for removing the air and water from the inside of the heater body 9. The opening 23 is made such that the end part of the heater body 9 is located substantially at the center of the opening 2 when the cap 21 is fixed to the heater body 9. The heater 7 is conducted at the time of defrosting a cooler and the heater 7 is heated up to about 400 deg.C when it is turned on to defrost the cooler.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art In general, a refrigerator having a cooler for cooling the inside of a refrigerator and a heater for defrosting provided below the cooler and energized at the time of defrosting is known.

[0003] In this type, generally, a rubber cap having a lead-in hole is covered on both ends of a main body of a defrosting heater, and the inside of the heater is sealed by the cap (for example, for example). , Actual fairness 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 thermal contraction, so that a breathing operation occurs, and the air in the air is generated. However, there is a problem that the moisture in the heater and the moisture transmitted through the lead wire enter the inside of the heater from the lead wire drawing hole of the cap. If the infiltrated water accumulates at both ends of the heater main body, rust is generated at a connection portion between the lead wire and the heater wire, and as the rust progresses, there is a problem that the wire is finally disconnected.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a defrosting heater which solves the above-mentioned problems of the prior art and prevents moisture entering the inside of the heater from collecting 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 which is energized at the time of defrosting, wherein caps having lead wire lead-in holes are provided at both ends of a heater body. The cap is provided with a downward opening that serves both as a vent and a vent in the heater body.

[0007]

According to the present invention, even if the air in the heater body repeats thermal expansion and contraction by repeatedly turning on and off the heater, the air flows in and out through the opening of the cap during that time. Operation is suppressed. Therefore, moisture does not enter through the lead-in hole. During this time, the opening of the cap is directed downward, so that moisture does not enter through the opening. Further, according to the present invention, even if moisture enters, the cap is provided with a downward opening, so that moisture is drained therefrom and does not accumulate at both ends of the heater main body. Therefore, rust does not occur at the connection between the heater wire and the lead wire, and trouble such as disconnection cannot occur.

[0008]

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

In FIG. 1, reference numeral 1 denotes a refrigerator compartment. In the refrigerator 1, an ice tray 3 is provided at the upper left as is well known.
However, a cooler 5 is arranged in the upper right part, and a heater 7 for defrosting is arranged below the cooler 5.

The heater 7 is an essential part of the present embodiment. As shown in FIG. 2, the heater 7 has a heater main body 9 made of a glass tube and a heater disposed in the heater main body 9. Wire 11, a ring-shaped support body 13 for supporting the heater wire 11, a lead wire 17 connected to the heater wire 11 via a connection portion 15, and a lead-in hole 1 of the lead wire 17.
9 made of rubber. FIG. 2 shows the right half of the heater 7, and the left half is symmetrical.

The heater 7 is energized when defrosting frost adhering to the cooler 5, and when it is turned on,
It is heated to about 400 ° C. to defrost the frost of the cooler 5.
As shown in FIG.
The water is collected in the evaporator 1 and guided to an evaporating dish (not shown) through a drain tube 33, and evaporates in the evaporating dish.

As described above, when the heater 7 is turned on, 400
It is heated to about ° C, but 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 main body 9 repeats thermal expansion and thermal contraction, and as a result, a breathing operation occurs in the heater main body 9.

As described above, the breathing operation guides the moisture in the air and the moisture transmitted to the lead wire 17 into the heater main body 9 through the lead wire drawing hole 19, as described above.
According to the present embodiment, measures are taken to suppress the respiratory action.

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 formed such that when the cap 21 is attached to the heater main body 9, the end of the heater main body 9 is located substantially at the center of the opening 23.

According to this, even if the air inside the heater main body 9 repeats thermal expansion and thermal contraction, the air is kept in the opening 23 during that time.
, The breathing operation inside the heater main body 9 is suppressed. When this operation is suppressed, the penetration of moisture through the lead wire drawing hole 19 is suppressed.

In the meantime, it is considered that moisture easily enters the heater body 9 through the opening 23. However, since this opening 23 is downward, actually the opening 2
Infiltration of moisture from 3 is suppressed. In any case, according to this embodiment, the breathing operation in the heater main body 9 is suppressed, so that the intrusion of moisture into the inside of the heater is greatly suppressed as compared with the conventional one.

According to this embodiment, even if moisture enters, the cap 21 has the downward opening 23, so that the moisture is drained therefrom and accumulated at both ends of the heater body 9. There is no. Moreover, this opening 2
3 is opened so that the end of the heater main body 9 is located substantially at the center of the opening 23, so that 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. There is no accumulation at both ends of the heater body 9.
Therefore, as in the related art, rust is generated at the connection portion 15 between the heater wire 11 and the lead wire 17, and troubles such as the rust progressing and disconnection are eliminated.

Referring to FIG. 2, a ring 25 is provided on the periphery of opening 23 of cap 21 so as to protrude in a ring shape. According to this, the water flowing through the heater main body 9 hardly adheres to the peripheral portion of the opening 23, so that the water flowing out of 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 hardly occurs 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 holes are provided at both ends of the heater main body, and the caps are provided with downward facing air and water drains in the heater main body. Is provided, the respiratory operation in the heater main body is suppressed, and the permeation of moisture through the lead wire drawing hole or the like is suppressed. Also,
Even if moisture enters, the water is drained from the downward opening of the cap, and does not accumulate at both ends of the heater main body.

[Brief description of the drawings]

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

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

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

[Explanation of symbols]

 7 Heater 9 Heater Body 11 Heater Wire 15 Connection 17 Lead Wire 19 Lead Wire Hole 21 Cap 23 Opening 25 Rib

Claims (1)

[Claims] 1. A defrosting heater energized at the time of defrosting, wherein a cap having a lead wire drawing hole is provided at both ends of a heater main body, and the cap has a downward opening for both air release and drainage in the heater main body. A heater for defrosting, comprising: