KR20160109089A - Electric heater for defrosting of freezing unit - Google Patents

Abstract

According to the present invention, an electric heater can prevent an electric wire from being broken. According to the defrost heater of a freezing unit, the present invention comprises: a pipe-shaped heater body; a heating coil; an insulator; and the electric wire. The present invention further comprises: a shrink tube; an insulation tube; and a protection cover.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a heater for a refrigeration unit,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a defrosting heater for a refrigeration unit, and more particularly to a refrigeration unit for an ice maker or an industrial or commercial refrigerator, In the construction of the electric heater to be used, the connection between the heat generating coil inside the heater body and the electric wire drawn from the outside is made firm and stable so that the electric wire can be prevented from being broken, and the connection between the electric wire and the heat generating coil And the outer diameter of the protective cover covering both ends of the heater body is maintained to be the same as the outer diameter of the heater body so as to improve the mountability to the refrigeration unit And at the same time, the adhesion of the heater body to the heat absorbing fin constituting the freezing unit is improved, The present invention relates to a heater for a defrosting unit of a refrigeration unit.

In general, as shown in Fig. 1, the cooling unit 10 of the icemaker or the household or commercial refrigerator is provided with the heat absorbing fins 12 having the excellent heat transfer efficiency at a tight interval over a predetermined length range, Each of the heat absorbing fins 12 has a structure in which a refrigerant circulating pipe 14 is connected in a closed loop manner and is connected to the refrigerant circulating pipe 14 through the refrigerant circulating pipe 14 together with compressed air generated from a general compressor Heat is exchanged between the heat absorbing fin 12 cooled by the refrigerant and the surrounding air when the heat absorbing fin 12 passes through the portion where the heat absorbing fin 12 is installed, So that the ice is formed by the principle of rapid decline.

In the conventional refrigeration unit 10, in the course of heat exchange between the heat-absorbing fin 12 cooled by the circulating refrigerant and the ambient air, dew on the outer surface of the heat- And the dew formed in this manner is frozen by the low temperature of the heat absorbing fin 12, thereby forming a glaze.

However, if the operating time of the freezing unit 10 becomes long and the thickness of the formed on the outer surface of each of the heat-absorbing fins 12 becomes thick, heat exchange between the heat-absorbing fins 12 and the ambient air becomes proper And the refrigeration effect per unit time is remarkably lowered.

Accordingly, in recent years, a large number of defrost heaters 16 are fitted in accordance with the installation direction of the heat absorbing fin 12 constituting the freezing unit 10, and the defrost heater 16 is supplied with a current The heat generated on the outer surface of the heat absorbing fin 12 is removed by the heat generated from the heat conductive heater 16. [

As shown in FIG. 2, the conventional heater 16 installed in the refrigeration unit 10 is made of a material having heat transfer characteristics, and a space having a predetermined diameter passes through the longitudinal center line of the interior, And a heating coil 18 connected to the connection terminal 20 at both ends of the heat generating coil 18 and connected to the heating coil 18, An insulator 24 applied between the heat generating coil 22 and the inner circumferential surface of the heater body 18 and connected to both ends of the heat generating coil 22 by being drawn toward both ends of the heater body 18, A connecting terminal 20 connected to both ends of the heat generating coil 22 in a state of covering the outer circumferential surfaces of both ends of the heater body 18 and a connecting terminal 20 connecting the electric wire 26 Moisture (濕气) from the outside does not penetrate the site. Comprises a rubber molding 28 which.

As a technique relating to the above-described heater for a commercial heater, Korean Utility Model Publication No. 20-1998-0009099 (name: electrothermal heater for refrigeration apparatus, hereinafter referred to as "prior art") has been proposed.

The prior art described above is capable of improving the workability of mounting by pressing and molding insulating and waterproofing materials to a predetermined thickness around the outer circumferential surface of the end portion of the heat transfer pipe and the electric wire drawing portion and significantly improving the insulating property and the waterproofing property 'As a point of technical composition.

However, in the above-mentioned prior art, the outer diameter of the waterproof material (rubber molding in Figs. 1 and 2) is formed to be larger than the outer diameter of the heat transfer pipe, and the mounting hole formed in the heat absorbing fin constituting the refrigerating device is inevitably fitted with the waterproof material The outer circumferential surface of the heat transfer pipe and the inner circumferential surface of the mounting hole formed in the heat absorbing fin are not in close contact with each other and are maintained in a state of being spaced apart from each other by a predetermined distance The heat generated from the heat transfer pipe is not rapidly transferred to the heat absorbing fin, thereby significantly deteriorating the defrost efficiency per unit time.

In the case where the outer diameter of the waterproofing material is larger than the outer diameter of the heat transfer pipe, even if the arrangement of the heat absorption fins is shifted even slightly, the defrost heater can not be inserted and the installation workability is greatly deteriorated, have.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide an electrothermal heater, which is installed in a freezing unit of an ice-maker or an industrial or commercial refrigerator, The present invention provides a new defrosting heater for a refrigeration unit, which can prevent the electric wires from being broken by firmly and stably connecting the exothermic coil inside the heater body and the electric wire drawn from the outside.

Another object of the present invention is to provide a heater for a defrosting unit of a new refrigeration unit, which prevents leakage of electric power by preventing a connection portion between an electric wire and a heat-generating coil from being exposed to moisture.

It is a further object of the present invention to provide a refrigerator which can maintain the outer diameter of the protective cover covering both ends of the heater body to be the same as the outer diameter of the heater body, And the defrosting efficiency per unit time can be greatly increased by providing a heater for the defrosting unit.

In order to achieve the above object, the present invention provides a heat exchanger comprising: a pipe-shaped heater body made of a material having heat transfer characteristics and having a space portion having a predetermined diameter penetrating along a longitudinal center line of the heater body; A heating coil connected to the connection terminals, an insulator charged between the heating coil and an inner circumferential surface of the heater body, and an insulator inserted into both ends of the heater body to generate heat, And a wire connected to connection terminals connected to both ends of the heat generating coil, the heat shielding heater comprising: a shrinking tube fitted tightly to an outer circumferential surface of a wire connected to the connection terminal on the heat generating coil so as not to break the wire; The connection terminal is electrically connected to the outer surface of the shrink tube corresponding to the connection portion between the connection terminal and the electric wire on the inner surface of the heating coil so as to electrically insulate the connection terminal to which the electric wire is connected, An insulating tube for preventing a flow into the terminal; And a protective cover which is inserted into the shroud tube and the insulating tube while holding the outside of the shroud tube and the insulating tube while maintaining the same outer diameter as the outer diameter of the heater body with respect to the end of the heater body.

In the present invention, at both ends of the heater body, a protective cover fitting portion of a stepped shape having an outer diameter smaller than the outer diameter of the heater body is formed in order to fit the protective cover while maintaining the same outer diameter as the heater body; The outer surface of the protective cover fitting portion has a feature that a plurality of embossing or knurling is formed in order to prevent the protective cover from being easily detached in a state where the protective cover is fitted.

According to the present invention, since the wire connected to the connection terminal on the heating coil inside the heater body is protected by the shrink tube, it is not easily broken, and the connection terminal to which the wire and the heating coil are connected is tight The electric insulation state is maintained, moisture is prevented from entering from the outside, leakage current can be prevented, and stability in use is greatly improved.

In addition, according to the present invention, since the outer diameter of the protective cover covering both ends of the heater body is maintained to be the same as the outer diameter of the heater body, the mounting performance to the heat absorbing fin constituting the freezing unit is greatly improved, Since the heater body is tightly adhered to the fin, the defrost efficiency per unit time can be greatly increased.

1 is a schematic perspective view showing a general refrigeration unit.
2 is a partially enlarged cross-sectional view showing a heater for a conventional developer applied to a freezing unit.
3 is a fragmentary perspective view showing a heater for a defrosting unit of a freezing unit according to the present invention.
4 is an enlarged cross-sectional view of the main part of the heater for defrosting the freezing unit according to the present invention.
5 is a partially enlarged cross-sectional view showing a state in which a heater for a garment according to the present invention is fitted on a heat absorbing fin constituting a refrigeration unit.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 to 5, an electrothermal heater that generates heat according to application of current is applied to the heater for defrosting 40 of the refrigeration unit according to the present invention.

In the heater for defrosting 40 according to the present invention, a heater body 18 made of a material having heat transfer characteristics like a conventional defroster heater and having a pipe-shaped space formed through a space having a predetermined diameter along the longitudinal center line of the heater is formed .

A heat generating coil 22 connected to the connection terminal 20 is installed at both ends of the space portion on the heater body 18 to generate heat while being heated according to the application of electric current. And an insulator 24 having heat transfer characteristics is filled between the inner circumferential surface of the insulating layer 18 and the inner circumferential surface.

The electric wires 26 are drawn from the outer sides of both ends of the heater body 18 and are connected to the connection terminals 20 connected to both ends of the heat generating coil 22. [

In the heater for defrosting the refrigeration unit according to the present invention, a separate shrink tube 42 is provided on the outer circumferential surface of the electric wire 26 connected to the connection terminal 20 on the heat generating coil 22, Tightly.

A connection terminal 20 to which a wire 26 is connected is electrically insulated from the shrink tube 42 at a connection portion between the connection terminal 20 and the wire 26 on the heat generating coil 22, At the same time, the insulating tube (44) for preventing external moisture from flowing into the connection terminal (20) is tightly fitted and adhered.

In this process, a silicone adhesive may be applied to the inner circumferential surfaces of the shrink tube 42 and the insulation tube 44 to enhance the adhesiveness.

The shroud tube 42 and the insulating tube 44 are covered and protected by a separate protective cover 46. The protective cover 46 is formed to be covered by the heater body 18 while maintaining the same outer diameter as the outer diameter of the heater body 18, (18) by hydraulic pressure.

The protection cover 46 may be formed of a metal or rubber material. The shrink tub portion 42 may be formed to have a length that is exposed to the outside of the front end of the protection cover 46 by a predetermined length.

In order to fit the protective cover 46 into the heater body 18 while maintaining the same outer diameter as that of the heater body 18, both ends of the heater body 18 are provided with stepped portions having outer diameters smaller than the outer diameter of the heater body 18, And a protective cover 46 is formed on the outer surface of the protective cover fitting part 50 so as to prevent knurling or a plurality of embossing Embossing: 52 can be formed.

The operation of the present invention is as follows.

When the electric heater 26 is connected to the connection terminal 20 on the heat generating coil 22 constituting the heater body 18 in manufacturing the heater for defrosting 40 of the freezing unit according to the present invention, 3 to 5, a shrink tube 42 coated with a silicone adhesive, an insulating tube 44, and a protection (not shown) are attached to one end of a wire 26 corresponding to a portion connected to the connection terminal 20, Fit the cover (46).

In this state, the end of the electric wire 26 is connected to the connection terminal 20, and then the shrinkable tube 42 to which the silicone adhesive is applied is pushed to the connection portion between the connection terminal and the electric wire, do.

Then, the insulating tube 44 having the inner surface coated with the silicone adhesive is pushed to the connecting portion between the connection terminal and the electric wire, so that the insulating tube 44 is adhered to the outer peripheral surface of the shrinkable tube 42 surrounding the corresponding portion.

Then, the protective cover 46 is pushed by hydraulic pressure so that its inner end is press-fitted outside the end portion of the heater body 18, thereby manufacturing the heater for defrosting the refrigeration unit according to the present invention.

In this process, the outer diameter of the protective cover 46 is kept the same as the outer diameter of the heater body 18. To this end, the outer diameter of the heater body 18 is smaller than the outer diameter of the heater body 18 A protective cover fitting portion 50 of a stepped shape can be formed.

A knurling or a number of embossings 52 may be formed on the outer surface of the protective cover fitting part 50 to prevent the protective cover 46 from being easily detached from the protective cover 46.

When the heater for defrosting 40 of the refrigeration unit manufactured as described above is inserted through the mounting hole 12a formed in the heat absorbing fin 12 on the refrigeration unit, the heater body 18 And remains in contact with the mounting hole 12a.

In this state, when the defrost heater 40 is operated to remove the gaps formed on the surface of the heat absorbing fin 12, the exothermic coil 22 buried in the heater body 18 is heated The heat generated from the heat generating coil 22 is quickly transferred to the respective heat absorbing fins 12 through the heater body 18 made of a thermally conductive material and melted and removed from the outer surface of the heat absorbing fins 12 .

12: heat absorbing pin 12a: mounting hole
18: heater body 20: connection terminal
22: heating coil 26: wire
42: shrink tube 44: insulating tube
46: protective cover 50: protective cover fitting part
52: Knurling or embossing.

Claims (2)

A heater body 18 made of a material having heat transfer characteristics and having a structure in which a space portion having a predetermined diameter is inserted and formed along a longitudinal center line of the heater body 18; A heating coil 22 connected to the connection terminal 20 at both ends and an insulator 24 charged between the inner circumferential surface of the heater coil 18 and the heating coil 22, And electric wires (26) drawn into both ends of the heater body (18) and connected to connection terminals (20) connected to both ends of the heating coil (22)
A shrink tube (42) fitted in contact with an outer circumferential surface of an electric wire (26) connected to the connection terminal (20) on the heat generating coil (22) so as not to break the electric wire (26);
The electric wire 26 is adhered to the outer side of the shrink tube 42 corresponding to the connection portion between the connection terminal 20 on the heat generating coil 22 and the electric wire 26 in the state where the silicone adhesive is applied on the inner surface, An insulation tube (44) for electrically insulating the connected connection terminals (20) and preventing external moisture from flowing into the connection terminals (20);
And further includes a protective cover 46 which is press-fitted while holding the outside of the shrink tube 42 and the insulation tube 44 while maintaining the same outer diameter as the outer diameter of the heater body 18 with respect to the end of the heater body 18 And a heater for heating the freezing unit. The method according to claim 1,
In order to fit the protective cover 46 to the heater body 18 while maintaining the same outer diameter as that of the heater body 18, both ends of the heater body 18 are covered with a protective cover- (50) is formed;
Wherein a knurling or a plurality of embossings 52 are formed on the outer surface of the protective cover fitting portion 50 to prevent the protective cover 46 from being easily detached from the outer surface of the protective cover fitting portion 50. [ Commercial heater.

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