JPH06313664A - Defrosting heater for refrigerator - Google Patents

Abstract

PURPOSE:To prevent deterioration of an insulation and corrosion of a metal part by penetrating defrosted water from a gap between a cap of the heater and leads into the heater. CONSTITUTION:A cap 8 and leads 5 of a defrosting heater 9 are passed through a waterproof heat-resistant tube 16, an outside of the tube 16 is bound, and the outside of the cap 8 is entirely brought into close contact with the inside of the tube 16. The other end of the tube 16 is formed with a downward opening, the leads 5 are formed in a U-shaped trap shape to be fixed. Thus, the heater is simply added with the tube 16 to obtain the heater having very high reliability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof structure for a defrosting heater such as a refrigerator and a refrigerator.

[0002]

2. Description of the Related Art A conventional example as disclosed in, for example, Japanese Utility Model Laid-Open No. 4-20990 will be described below with reference to FIGS. 7 and 8. FIG. 7 is a front cross-sectional view of a conventional defrosting heater for a refrigerator, and FIG. 8 is an enlarged main-part cross-sectional view of portion B of FIG. In FIGS. 7 and 8, reference numeral 1 is a cool air circulation fan provided on the back surface of the inside of the refrigerator, and 2 is a cooler provided on the lower surface thereof. 3 is a cylindrical heat-resistant glass tube provided in the lateral longitudinal direction in the vicinity of the lower part of the cooler 2, 4 is a heater wire made of an iron-chromium alloy coiled inside the glass tube 3, and 5 is Lead wires connected to both ends of the heater wire 4, and 6 are terminals for supporting the lead wire 5 and connecting the heat resistant lead wire 5 outside the heater. Reference numeral 7 is a disk which is provided at both ends of the glass tube 3 and closes both openings of the glass tube 3 to support the terminal 6. Reference numeral 8 denotes a silicone rubber cap that seals both ends of the glass tube 3, abuts the disk 7 on the end surface portion of the glass tube 3, and supports the heat-resistant lead wire 5 through it. 9 is a glass tube 3
Is a defrosting heater including a heater wire 4 made of an iron-chromium alloy wound in a coil shape inside. Reference numeral 10 is both end portions of the heater wire 4, and 11 is a straight lead wire connecting both end portions 10 of the heater wire 4 and the terminal 6.

The operation of the conventional defrosting heater for a refrigerator having the above structure will be described below. The cool air that has undergone heat exchange in the cooler 2 is circulated into the interior by the cool air circulation fan 1 to cool and store the stored items such as food. On the other hand, the air passing through the cooler 2 is dehumidified, becomes frost, gradually develops, and adheres to the surface of the cooler 2 to obstruct the air flow. The defrosting heater 9 defrosts and defrosts to maintain the cooling performance.

[0004]

Since the conventional defrosting heater is constructed as described above, the frost adhering to the cooler surface is melted by the heat generated by the defrosting heater, and then defrosted water is added. When dropped on the cap or on the lead wire, the water drop is guided by the movement of the gravity wire along the lead wire and the cap to the end portion of the cap, that is, the outlet portion of the lead wire. The safety and life of the refrigerator, which may cause insulation deterioration due to penetration into the defrosting heater through the gap of the gap and corrosion of metal parts such as the conductors of the heater wire and lead wire, resulting in disconnection in the worst case. However, there was a problem such as poor reliability. Therefore, if you try to completely seal the gap between the lead wire and the cap and shut off the inside of the glass tube from the outside air, when the defrosting heater is energized, the pressure inside the glass tube rises sharply due to the heat generated by the heater wire. There was a problem that the tube ruptured or the cap came off the glass tube.

The present invention has been made to solve the above problems. Even when defrosting water drops on the defrosting heater cap, lead wire, etc., insulation deterioration and internal defrosting heater An object of the present invention is to obtain a defrosting heater for a refrigerator that does not cause a problem such as corrosion, and does not have a safety problem such as a glass tube rupturing or a cap coming off while the defrosting heater is energized. .

[0006]

In the defrosting heater according to the present invention, a lead wire is passed through a waterproof and heat resistant tube, and the cap side of the waterproof and heat resistant tube is closely fixed to the cap. Further, a water draining section and an air circulating section for the outside air are provided at the end of the waterproof tube on the side opposite to the cap.

[0007]

In the defrosting heater according to the present invention, when defrosting water drops on the cap or the waterproof tube, the gap between the cap and the lead wire is covered with the waterproof tube, and the defrosting water drops on the lead wire. When this happens, water drops will drop as they are due to the water draining portion, so that the water does not enter the defrost heater through the lead wires. Further, the air expanded by the heater wire heat generation when the defrosting heater is energized flows out to the outside from the end of the waterproof tube on the non-cap side.

[0008]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a front sectional view of a refrigerator according to an embodiment of the present invention, FIG. 2 is an enlarged main portion sectional view of portion A of FIG. 1, FIG. 3 is an enlarged main portion sectional view of portion B of FIG. FIG. 3 is an enlarged main part sectional view of a C portion and a D portion of FIG. 1. still,
Only the main part of this embodiment will be described below, and the same components as those of the conventional example will be denoted by the same reference numerals and detailed description thereof will be omitted. In FIGS. 1 and 2, 3 is a cooler 2
A heat-resistant cylindrical glass tube provided in the lateral and longitudinal direction near the lower part of the coil, 4 is a coil portion heater wire made of an iron-chromium alloy coiled inside the glass tube 3, and 10 is a coil portion heater. The end portion of the wire, 11 is a linear heater wire, 5 is a lead wire for supplying an electric current to the heater wires (11, 4) through the terminal portion 6, and 6 is a linear heater wire 11 and the lead wire 5. It is the terminal part to be connected. Reference numeral 16 is a tube made of heat-resistant silicon rubber or the like which is passed through the lead wire 5,
The cap 8 side is tightly fixed to the entire circumference of the cap 8 by a first fixing tool 17 such as a binder. Further, the end of the tube 16 on the side opposite to the cap 8 is bent at the portion D and opens downward. Reference numeral 18 denotes a second fixing tool such as a binder, which fixes the lead wire 5 and the tube 16 together between the bent portion D of the tube 16 and the bent portion E of the lead wire 5. Reference numeral 19 is a first air flow gap (hereinafter, abbreviated as a first gap) generated between the tube 16 and the lead wire 5. 20 is the second that occurs between the lead wire 5 and the cap 8.
The air circulation gap (hereinafter, abbreviated as a second gap).

The operation of this embodiment will be described below. By energizing the defrost heater 9, the heater wire 4 generates heat, melts the frost adhering to the cooler 2, and discharges it as defrost water (a drainage mechanism is not shown). At that time, a water droplet of defrosting water may drop on the cap 8 of the defrosting heater 9,
Since the cap 8 is covered with the tube 16 and is fixed by the first fixing tool 17 so that the entire circumference is in close contact with the inside of the tube 16, water droplets do not enter the first gap. In addition, the lead wire 5 and the tube 1 shown in the section B
6. If water droplets adhere to the second fixture 18, if water droplets move to the bent portion E of the lead wire and fall due to the weight of the water droplets, or if water droplets travel along the tube 16 and around the area A, As described above, since the tube 16 and the cap 8 are in close contact with each other all around by the first fixing member 17, in any case, the second clearance 20 between the lead wire 5 and the cap 8 is provided.
The water droplets do not move to the inside and enter the inside of the glass tube 3. Further, the heat in the heater wire 4 causes the air in the glass tube 3 to rapidly rise in temperature and expand, but flows out through the second gap 20 and the first gap 19 to the outside.

Embodiment 2. In the above embodiment, the water draining structure of the portion B is arranged so that the end surface of the tube 16 faces downward so that water droplets do not move into the first gap 19. However, as shown in FIGS. If the end surface is facing upward, a water resistant bag 20 is provided separately and the tube 16
If the upper opening is covered and fixed together with the lead wire 5 and the tube 16 by the second fixing tool 18, the same effect as that of the above-described embodiment is obtained. In addition, as a method of tightly adhering the tube 16 and the cap 8 around the entire circumference, the first fixture 17 is attached to the tube 16
Although the first fixing tool is not used, the adhesive may be used to fix the inside of the tube 16 and the cap 8 so that the entire circumference is in close contact with the cap 8.

[0011]

As described above, according to the present invention, when defrosting water drops on the defrosting heater or its lead wire, the defrosting water is surely drained so that the water droplets enter the defrosting heater. Since it is configured to prevent this, there is an effect that it is possible to obtain a defrosting heater for a refrigerator that is extremely reliable against the insulation of the defrosting heater and corrosion of metal parts such as the heater wire.

[Brief description of drawings]

FIG. 1 is a front sectional view of a defrosting heater for a refrigerator according to an exemplary embodiment of the present invention.

FIG. 2 is an enlarged sectional view of an essential part of a portion A of FIG. 1 according to the present invention.

FIG. 3 is an enlarged sectional view of an essential part of a portion B of FIG. 1 of the present invention.

FIG. 4 is an enlarged sectional view of an essential part of a C portion and a D portion of FIG. 1 of the present invention.

FIG. 5 is an enlarged view showing a part B of FIG. 1 according to another embodiment of the present invention.

6 is a cross-sectional view of FIG. 5 of the present invention.

FIG. 7 is a front sectional view of a conventional defrosting heater for a refrigerator.

8 is an enlarged cross-sectional view of a main part of a conventional refrigerator in a portion A of FIG. 7.

[Explanation of symbols]

 2 cooler 3 glass tube 4 heater wire 5 lead wire 8 cap 9 defrosting heater 16 tube 17 first fixing tool 18 second fixing tool

Claims (5)

[Claims] 1. A refrigerator is disposed below a cooler of a refrigerator, is wound in a coil inside a cylindrical insulating tube, and is provided with a heater wire for passing an electric current to generate heat and defrost, and both ends of the insulating tube. Is sealed with a heat-resistant insulating cap, both ends of the heater wire are connected to conductors of heat-resistant lead wires, and the connecting portions are arranged in the insulating cap, and the lead wire is attached to the insulating cap. In a defrosting heater for a refrigerator adapted to be drawn out of the insulating cap through a provided through hole, the lead wire is covered with a tube having heat and water resistance, and the entire circumference of the tube on the insulating tube side is covered with the insulating cap. A heater for defrosting a refrigerator, which is closely fixed to. 2. An insulating cap side of a tube having heat and water resistance is overlapped with an insulating cap, and an outer periphery of the overlapping part is bound with a fixing tool to tightly fix the inside of the tube and the outside of the insulating pipe. A heater for defrosting a refrigerator according to claim 1, wherein the heater is for defrosting. 3. An insulating pipe side of a tube having heat and water resistance is overlapped with an insulating cap, and an adhesive is applied to the entire inner circumference of the inside of the tube and the outside of the insulating cap of the overlapping portion. Thus, the heater for defrosting the refrigerator according to claim 1, wherein the inside of the tube and the outside of the insulating cap are closely fixed to each other. 4. A tube having heat and water resistance is fixed so that the opening of the opposite end of the tube, which is closely fixed to the insulating cap, faces downward, and there is a gap between the inside of the tube and the lead wire. The defrosting heater for a refrigerator according to claim 1, 2 or 3, wherein the heater is provided. 5. A tube having heat and water resistance is arranged so that the opening at the opposite end, which is tightly fixed to the insulating cap, is facing upward, and the opening is covered from above by a bag having water resistance. Claim 1 characterized in that the gap is fixed between the inside of the tube and the lead wire, and further provided between the opening of the bag and the outside air. And a heater for defrosting a refrigerator according to the second or third aspect.