JPH09105575A - Defrosting device for evaporator for cold storage - Google Patents

Abstract

(57) Abstract: A defrosting method for an evaporator for a cooler that melts and removes frost adhering to and grows on the evaporator for a cooler, and an object thereof is to efficiently melt and remove frost in a short time. SOLUTION: A defrosting lamp heater is installed on the lower surface of a cooler evaporator, and light radiation energy of the defrosting lamp heater is absorbed between the cooler evaporator and the defrosting lamp heater to generate heat. By installing a surface-treated defrosting lamp heater protection cover and performing defrosting using the natural convection heat of the defrosting lamp heater and light radiant energy, defrosting can be performed more efficiently than conventional ones. It can be carried out. Also,
By changing the shape of the defrosting lamp heater protection cover, changing the inclination of the defrosting lamp heater, and by applying a hydrophobic surface treatment to the defrosting lamp heater protection cover, drain water from the evaporator can be removed. To the drain pan without remaining on the defrosting lamp heater protection cover to effectively utilize the energy of the defrosting lamp heater,
Efficient defrosting is performed in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a refrigerator, a refrigerator,
The present invention relates to a defrosting device for an evaporator for a cooler for removing frost attached to an evaporator used in a cooler such as a freezer or a freezer.

[0002]

2. Description of the Related Art Generally, an evaporator used in a cold storage device such as a refrigerator-freezer has a phenomenon in which surrounding water is cooled and adheres as frost to grow on its surface. If frost grows on the surface of the evaporator, the performance of the evaporator deteriorates, so a defrosting device for melting and removing the frost adhered and grown near the evaporator is provided.

As a defrosting method for an evaporator for a cooler, there is a defroster as shown in FIG. FIG. 11 shows a front view (FIG. A) and a side cross-sectional view (FIG. B) showing only the freezer compartment when the evaporator of the domestic refrigerator / freezer is installed in the evaporator room at the back of the freezer compartment. In FIG. 11, 101 is a freezer, 102 is an evaporator, 103 is a defrosting infrared heater protective cover, 104 is a defrosting infrared heater, 105 is an internal circulation fan, 106 is a drain pan, 107 is a drain pipe, and 108. Is a duct, 109 is a temperature sensor, 110
Shows a holding plate for the defrosting lamp heater and the defrosting lamp heater protection cover.

During operation of the freezer-refrigerator, the air cooled by the evaporator 102 is partially stored in the freezer compartment 101 via the internal circulation fan 105, and a part (not shown) is stored in other storage. It is sent to the chamber to cool each storage chamber, and then returns to the evaporator 102 through the duct 108 and is cooled again. During this process, frost adheres to the surface of the evaporator 102 and grows due to inflow air from the door and moisture from foods and the like.

In a general refrigerating refrigerator, when the accumulated operation time of the compressor has passed a preset fixed time or when the defrost switch is pressed, the internal circulation fan 105 and the compressor for the refrigeration cycle not shown are While stopping, the defrosting infrared heater 104 provided in the lower part of the evaporator 102 is energized to start defrosting. The outer periphery of the infrared heater for defrost 104 is covered and protected by a glass tube, and a metal protective cover 103 is provided on the upper portion of the infrared heater for defrost so that water drops do not come into contact with and damage the glass tube when the glass tube is hot. Has been. Infrared heater for defrosting 1
When 04 is electrically heated, the air around the evaporator 102 is heated and rises by natural convection to melt the frost that has adhered and grown on the surface of the evaporator 102. A part of the melted water droplets directly or partially drops on the heater protection cover 103 and then flows down into the drain pan 106 to cause a drain pipe 107.
Is discharged to the outside of the refrigerator / freezer via the.

The temperature of the temperature sensor 109 is a predetermined temperature (the temperature sensor cannot be installed on the evaporator 102, so the temperature sensor 109 is installed near the evaporator cover and the temperature at the end of defrosting is experimentally measured. When the temperature of the defrosting infrared heater 104 is reached, the power supply to the defrosting infrared heater 104 is stopped and the cooling mode is set.

Further, as a defrosting device for an evaporator for a refrigeration system using a radiant heat heater, there is a device as disclosed in Japanese Patent Laid-Open No. 3-113260. As a configuration,
As shown in FIG. 12, a heat-resistant mesh-like far-infrared radiator heater protection cover 112 is provided below the evaporator 111 for the refrigerating apparatus, and a radiant heater 113 is provided below the heater protection cover 112. Radiant heat and convective heat transfer are generated by the radiant heat heater 113, and pass through the mesh of the heater protection cover 113 which is a heat-resistant mesh-like far-infrared radiator (for example, far-infrared radiator ceramic or far-infrared paint). Further, radiant heat is radiated from the heater protection cover 112, which is the reticulated far-infrared radiator of the mesh shape heated by the radiant heat and the convective heat transfer,
The evaporator 111 for the refrigeration system installed above is defrosted.

[0008]

Evaporator 1 as described above.
In the device that defrosts the evaporator of the cooler using only the natural convection heat of the air by using the infrared heater 104 for defrosting installed in the lower part of 02, the defrosting process of the evaporator 102 is performed by the evaporator 10
It melts like drawing an arc from the bottom of 2, and near the end of defrost, the frost on the left and right ends of the upper part of the evaporator 102 remains and remains for defrosting installed at the bottom of the evaporator 102. This is a state where the energy input by the infrared heater 104 is not effectively used. On the other hand, this causes the fins and refrigerant pipes of the evaporator in the part where the surface frost has already melted to overheat, and the overheated air flows into the low-temperature refrigerator / refrigerator, increasing the internal air during defrosting. The energy loss was large. Further, the drain water dripped from the evaporator 102 stays on the defrosting infrared heater protection cover 103, and a part of the energy of the defrosting infrared heater is spent for heating and vaporizing the drain water, thereby defrosting. There was also a state where the energy of the infrared heater for use could not be used effectively.

In the above-mentioned Japanese Patent Laid-Open No. 3-113260, the heater protection cover 112 protects the frost and drain water falling from the evaporator 111 for the refrigeration system from being directly hit and damaged by the radiant heater 113, and falls. It is described that the drain water scatters due to the impact of falling onto the heater protection cover 112, which is a mesh-like far-infrared radiator, and prevents evaporation noise without directly hitting the radiant heater 113, but the drain water that actually drops is a mesh heater. There is a risk of passing through the protective cover 112. In addition, a part of the drain water that has fallen is always attached to the mesh-shaped heater protection cover 112. Since the drain water attached at this time is evaporated by being heated by the radiant heat heater 113, a part of the energy from the radiant heat heater 113 is used for the sensible heat required to raise the temperature of the drain water and the energy for the latent heat of vaporization. Energy from the heater 113 is not effectively used for defrosting. Also,
If the frost adhering to and growing on the evaporator 111 drops onto the net-like heater protection cover 112 as it is, the frost is always caught because the heater protection cover is net-like, and after melting, the sensible heat and evaporation latent heat components similar to the above Energy is consumed and the efficiency of the radiant heater 112 for defrosting is reduced.

[0010]

In order to solve the above-mentioned problems, the present invention provides a defrosting infrared heater 1 for a conventional defrosting apparatus.
Noting that defrosting is performed only by natural convection due to heat from 04, a defrosting lamp heater is used instead of the defrosting infrared heater 104, and a heater is provided on the surface facing the defrosting lamp heater. The defrosting lamp heater protection cover, which is processed to easily absorb the light radiant energy emitted by the equipment and the heat to be absorbed to the surface of the evaporator side, is installed in the same way as the conventional defrosting device. And a defrosting device for a cooler evaporator installed between the defrosting lamp heater. Further, the defrosting lamp heater is characterized by using a far-infrared lamp heater having a radiant light peak wavelength of about 5.5 μm.

Further, in the defrosting device of the present invention, the surface shape of the defrosting lamp heater protection cover facing the evaporator is
It is characterized by having a configuration including an inclined portion or a curved portion. Further, the defrosting device of the present invention is characterized in that a defrosting lamp heater protective cover having a hydrophobic treatment on its surface is installed.

[0012]

By constructing the defrosting device in which the defrosting lamp heater is installed at the position of the conventional defrosting infrared heater under the evaporator as described above, natural convection from the conventional defrosting heater is achieved. In addition to heat, defrosting can be performed in a short time by using light radiant energy from a defrosting lamp heater that cannot be used conventionally.

In addition, a heat collecting effect can be obtained by performing a process for easily absorbing the light radiation energy of the defrosting lamp heater on the defrosting lamp heater protection cover installed between the evaporator and the defrosting lamp heater. It is possible to use more radiant heat in combination with conventional natural convection heat by improving and performing a treatment that easily radiates the collected heat,
Defrosting can be performed efficiently.

By making the specification of the defrosting lamp heater a far-infrared lamp heater having a radiant light wavelength peak of 5.5 μm, which is best absorbed by frost, it is possible to protect the defrosting lamp heater from rebounding from the periphery. The leaked light radiant energy can be effectively used and defrosting can be performed efficiently.

Further, by making the shape of the defrosting lamp heater protection cover to include a sloped portion or a curved portion, the drain water dropped on the defrosting lamp heater protection cover can be quickly dropped into the drain pan. As a result, the energy from the defrosting lamp heater can be effectively used without spending on heating and evaporation of drain water on the defrosting lamp heater protective cover, and defrosting can be performed efficiently.

Furthermore, by performing a hydrophobic surface treatment on the defrosting lamp heater protective cover, the drain water dropped on the protective cover is likely to drop, and the defrosting can be efficiently performed by the same action as above. it can.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below. [Embodiment 1] FIG. 1 is a configuration diagram showing an embodiment in which the present invention is applied to an evaporator chamber of a domestic refrigerator-freezer. FIG.
In FIG. 1, (a) is a front view, (b) is a side sectional view, 1 is a freezer compartment, 2 is an evaporator, 3 is a defrosting lamp heater protection cover, 4 is a defrosting lamp heater, and 5 is a cabinet. An internal circulation fan, 6 is a drain pan, 7 is a drain pipe, 8 is a duct, 9 is a temperature sensor, and 10 is a defrosting lamp heater and a holding plate for a defrosting lamp heater protection cover.

The freezing room specifications of a general refrigerator / freezer of 400 liter class are shown below. Steel plate on the outside of the freezer compartment 1,
The inner side is made of synthetic resin, and a heat insulating material such as urethane foam is filled between them to perform heat insulation. Size is 600
It has a capacity of about mm (width) × 450 mm (height) × 500 mm (depth). The evaporator 2 is a plate-fin heat exchanger made of aluminum and has a size of 40
It is about 0 mm (width) × 250 mm (height) × 40 mm (depth). The installation position has a space of about 30 to 40 mm from each wall surface. 380 mm (width) 10 mm to 20 mm below the evaporator 2
An aluminum defrosting lamp heater protection cover 3 (having a flat surface facing the evaporator 2) of about 20 mm (height) x 30 mm (depth) is installed, and its 10 mm to 20 mm 10mm diameter x 3
An 80 mm (length) defrosting lamp heater 4 (having an outer periphery covered and protected by a glass tube or the like and not surface-coated) is installed. This defrosting lamp heater protection cover 3 and defrosting lamp heater 4
Both ends are fixed by holding plates 10. This installation state is shown in FIG. FIG. 2 is an enlarged view of the fixing positions of the defrosting lamp heater protection cover 3 and the defrosting lamp heater 4 of FIG. The holding plate 10 made of aluminum is integrated with the drain pan 6 made of aluminum, and both ends of the defrosting lamp heater 4 are generally protected by insulating rubber or ceramic, and are fixed by the protected portions. In addition, the tip of the holding plate 10 is a paragraph having a width of 5 mm, and the tip is provided with holes (about 5 mm) at both ends of the lamp heater protection cover 3 for defrosting.
The holding plate 10 is stably fixed at a section of the holding plate 10, and the tip of the holding plate 10 is bent and fixed.

When the far-infrared lamp having the peak wavelength λ = 5.5 μm is used for the defrosting lamp heater 4, it is known that the frost layer is melted in an efficient state in the literature (Proceedings of the Japanese Refrigeration Association Vol 9, No3 (1992) pp. 2
57-268), and in the present invention, a far infrared lamp heater having a peak wavelength near λ = 5.5 μm is used. However, if the radiant heat is effectively utilized by performing a surface treatment that absorbs radiant energy in a form corresponding to the peak wavelength of the defrosting lamp heater 4, the peak wavelength of the defrosting lamp heater 4 will be at any wavelength. Is also effective. On the other hand, as for the defrosting lamp heater protection cover 3, a selective absorption surface treatment for absorbing heat radiated by the defrosting lamp heater 4 on the back surface to generate heat is performed by a secondary electrolytic coloring method, a plating method, or a chemical conversion treatment method. Use the one that has been painted. In this case, the surface treatment of the aluminum oxide film by the secondary electrolytic coloring method is suitable for the selective absorption surface treatment because the defrosting lamp heater protection cover 3 is made of aluminum. Further, the front surface of the defrosting lamp heater protection cover 3 is not so good in heat radiation with aluminum, so surface treatment such as coating with heat radiation paint is performed. The heat radiation paint does not have to be specified in particular, as long as it loses the surface gloss of the aluminum, a general water resistant paint paint may be used. There is no limitation on the color, but black is preferable.

Next, the operation when the present invention is applied to a general household refrigerator-freezer will be described. During operation of the freezer-refrigerator, a part of the air cooled by the evaporator 2 is put into the freezer compartment 1 via the internal air circulation fan 5, and a part (not shown) is put to another storage compartment. It is sent to cool each storage chamber, and then returns to the evaporator 2 through the duct 8 and is cooled again. During this process, frost adheres to the surface of the evaporator 2 and grows due to inflow air from the door and moisture from food.

In a general household refrigerator-freezer, the defrosting mode is entered when the accumulated operating time of the compressor has exceeded a preset fixed time or when the defrosting switch is pressed. At this time, the defrosting lamp heater 4 is energized to start defrosting. Due to the heat generated by the defrosting lamp heater 4, the air around the evaporator 2 is heated and rises due to natural convection, and the frost attached and grown on the surface of the evaporator 2 begins to melt. At the same time, the light radiant energy from the defrosting lamp heater 4 is radiated and reaches the defrosting lamp heater protection cover 3, where it is efficiently absorbed and generates heat, and the radiant heat adheres to and grows on the surface of the evaporator 2. The frost is melted with the above natural convection heat.

Further, by forming the drain pan 6 installed under the defrosting lamp heater 4 from aluminum or the like having a reflectance of about 95%, the light emitted from the defrosting lamp heater 4 in the downward direction is radiated. The amount of energy reflected by the drain pan 6, absorbed and transmitted is very small, and the evaporator 2
Since most of the radiant energy that bounces off reaches the defrosting process, the auxiliary action of the above defrosting process works, and more efficient defrosting can be performed. Further, if the wall surface around the evaporator 2 is covered with a film or foil of the above-mentioned material or the like, or if the wall surface is made of a thin plate, the same effect as above can be obtained, and the light radiation energy emitted from the defrosting lamp heater 3 can be obtained. Most of the above will reach the entire evaporator 2, so that the defrosting can be performed efficiently, and the defrosting time can be shortened and the defrosting device can save energy.

Further, as described above, the defrosting lamp heater 4 is used.
The surface of the evaporator 2 is exposed as the melting of the frost adhering to and growing on the evaporator 2 progresses due to the light radiant energy.
The evaporator 2 is made of aluminum due to heat conduction and the like, and by constructing this aluminum with a reflectance of about 95%, the light radiation reflected by the drain pan 6 and the wall around the evaporator 2 is emitted. Energy is diffusely reflected to the entire evaporator 2 and the inside to efficiently defrost.

The light radiant energy of the defrosting lamp heater and the drain water melted by natural convection heat flow down into the drain pan 6 and are collected and discharged to the outside of the freezer-refrigerator via the drain pipe 7. When the temperature of the temperature sensor 9 reaches a predetermined temperature, the defrosting lamp heater 4
Is stopped, the defrosting mode is terminated, the cooling mode is entered, and the compressor for cooling the inside of the refrigerator is operated.

[Second Embodiment] Another embodiment of the present invention will be described. The configuration of the defrosting device is the same as that of the first embodiment except for the shape of the defrosting lamp heater protection cover, so the shape of the defrosting lamp heater protection cover will be described. FIG. 3 shows the shape of the defrosting lamp heater protection cover 3. In FIG. 3, (a) is a schematic diagram,
(B) is a side view, 21 is a defrosting lamp heater protection cover, and 22 is a drain discharge path.

Here, the defrosting lamp heater protective cover 2
The defrosting lamp heater protection cover 2 in which drain water stays as water droplets on 1 and is heated by the defrosting lamp heater 4
1, the drain water is heated and evaporated, and the input energy of the defrosting lamp heater is consumed for purposes other than defrosting. However, a drain discharge passage such as 22 is provided. By doing so, it is possible to easily drop the drain pan 6, and the above problems can be solved.

The operation of the present invention will be described below. However, since the defrosting device is the same device as that of the first embodiment, the evaporator 2 is placed on the defrosting lamp heater protection cover 21.
The portion where the defrosted drain water from drips drops onto the drain pan 6 will be described. At the start of defrosting, a part of the drain water defrosted by the defrosting lamp heater 4 is dropped on the defrosting lamp heater protection cover 21, but drops on the drain pan 6 through the drain discharge path 22. To go.
Since the drain water does not stay on the defrosting lamp heater protection cover in this way, the input energy of the defrosting lamp heater 4 is efficiently consumed in a short time without being spent on heating and evaporation of the drain water. Can make frost.

Here, other than the shape of the defrosting lamp heater protection cover 21 shown in FIG. 3, shapes, inclinations and angles as shown in FIGS. 3 to 10 are conceivable. In each figure (a)
Shows a schematic view, and (b) shows a side view. In addition, although the angle is changed in FIGS. 8 to 10, the inclination may be in any of the front, rear, left, and right directions, but it is preferable that water droplets of drain water move on the defrosting lamp heater protection cover. A direction perpendicular to the longitudinal direction of the heater having a short distance is desirable, and there is no problem as long as the defrosted drain water does not remain on the defrosting lamp heater protective cover. Also, in terms of shape, there is no problem as long as drain water does not stay on the defrosting lamp heater protection cover.

Third Embodiment Another embodiment according to the present invention will be described. Except for the surface treatment of the defrosting lamp heater protection cover, the device is the same as that of the first and second embodiments, and the description thereof is omitted. By performing a hydrophobic surface treatment on the defrosting lamp heater protective cover with fluorine or silicon, drain water can be dripped from the defrosting lamp heater protective cover to the drain pan 6 more quickly. It is possible to effectively utilize the energy of the defrosting lamp heater 3 for defrosting without consuming the energy of the defrosting lamp heater 3 due to heat change or latent heat of vaporization. Here, the shape of the defrosting lamp heater protection cover can be applied to all the shapes described in the first and second embodiments. Further, it is considered that the defrosting device of the evaporator for the cold insulation device using the defrosting heater other than the present invention is also effective.

[0030]

EXAMPLES In the case of the present invention and the conventional infrared heater 1 for defrosting
When the defrosting experiment was performed using No. 04, the results shown in Table 1 below were obtained. However, the following experimental results are simulated freezer room experimental devices (400 liter class freezer shape)
The experimental conditions were the high humidity temperature condition of the cold power test of the refrigerator at the National Living Center. Here, the defrosting completion is the time point when the frost completely adhered and grown on the evaporator is visually melted.

[0031]

[Table 1]

Here, in this experiment, the values are obtained when an experiment is performed using a lamp heater having a peak value of wavelength-radiation energy characteristics in the near infrared region. From the experimental results, when the defrosting device of the present invention is used, it is about 1
The defrosting efficiency was improved by 5%. The defrosting efficiency is obtained by dividing the latent heat of fusion corresponding to the amount of drain obtained by the experiment by the electric power consumption of the heater, and considers only the latent heat change of water and not the sensible heat change. Since the drain amount is slightly different, the heater input amount and the input time are affected, but the defrosting efficiency can be determined at the same level.

Further, the improvement of the defrosting efficiency is due to the fact that the light radiation energy of the defrosting lamp heater 4 can be efficiently absorbed and radiated by the defrosting lamp heater protection cover 3 and the radiant heat can be effectively utilized. . This means that in the present invention, the surface temperature of the defrosting lamp heater protection cover 3 should be higher than that when the conventional defrosting infrared heater 104 is used. In order to confirm this, an experiment was conducted on the temperature of the defrosting heater protection cover.
As an experimental method, the experimental apparatus and the ambient temperature were set to 30 ° C., the defrosting heater was input for 30 minutes, and the elapsed temperature was measured. Table 2 shows the results. (The following values are
It is the reached temperature after 30 minutes. )

[0034]

[Table 2]

From the results of this experiment, in the case of the present invention, it was confirmed that the surface temperature of the defrosting heater protective cover is higher than that of the conventional one using the defrosting infrared heater 104, and the utilization of radiant heat is increased. It was confirmed. When defrosting is actually performed, drain water accumulates on the defrosting lamp heater protection cover 3 as water droplets, and the defrosting lamp heater protection cover 3 heated by the defrosting lamp heater 4 heats and evaporates it. However, there is a problem that the energy input to the defrosting lamp heater is consumed for purposes other than defrosting. In addition, the present invention shows a defrosting efficiency improvement of about 15% over the conventional defroster.

[0036]

As described above, according to the present invention, the defrosting lamp heater (preferably, the peak value of the wavelength-radiation energy characteristic is in the far infrared region) is installed in the vicinity of the evaporator for the cooler. In addition, a defrosting lamp heater protective cover is used between the evaporator for the cooler and the defrosting lamp heater that has been selectively heat-treated by a selective absorption surface treatment such as selective absorption paint to absorb light radiation energy. In addition, the drain pan 6 is formed of a material such as aluminum having a reflectance of about 95%, and the surrounding wall surface of the evaporator is covered with a film, foil, or thin plate having the same reflectance, thereby making Light radiation energy can be effectively utilized by utilizing radiation heat by light radiation energy and direct absorption into frost by rebounding, and in combination with natural convection heat, the frost that has adhered and grown on the evaporator can be efficiently melted, and it can be used for a short time. You can complete defrosting with.

By making the shape of the defrosting lamp heater protective cover to include a sloped portion or a curved portion, drain water defrosted from the evaporator 2 remains on the defrosting lamp heater protective cover. Since the residual latent water vaporization latent heat amount and sensible heat change amount are not consumed, the energy of the defrosting lamp heater can be effectively used and defrosting can be completed in a short time. This reduces the power consumption of the lamp heater for defrosting.
The heat load due to the cooling stop of the cooler and the heat load due to the heat leakage of the defrosting lamp heater are also reduced, and the energy required for recooling is reduced by that amount, resulting in an energy saving system, and the defrosting time shortens the inside of the cooler. The effect of delaying the progress of the deterioration of the quality of the cold-insulated product can be obtained by reducing the temperature fluctuation of

By performing the hydrophobic surface treatment on the defrosting lamp heater protection cover, the above effects can be further enhanced, and the defrosting can be effectively completed.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of a defrosting device according to the present invention. ((A) Front view, (b) Side sectional view)

FIG. 2 is a view showing an installation state of a defrosting lamp heater and a defrosting lamp heater protection cover of the defrosting device according to the present invention.

FIG. 3 is a shape diagram of a defrosting lamp heater protection cover of an embodiment of the defrosting device according to the present invention. ((A) Schematic view, (b) Side view)

FIG. 4 is a shape view of a defrosting lamp heater protection cover of an embodiment of the defrosting device according to the present invention. ((A) Schematic view, (b) Side view)

FIG. 5 is a shape diagram of a defrosting lamp heater protection cover of an embodiment of the defrosting device according to the present invention. ((A) Schematic view, (b) Side view)

FIG. 6 is a shape view of a defrosting lamp heater protection cover of an embodiment of the defrosting device according to the present invention. ((A) Schematic view, (b) Side view)

FIG. 7 is a shape view of a defrosting lamp heater protection cover of an embodiment of the defrosting device according to the present invention. ((A) Schematic view, (b) Side view)

FIG. 8 is an installation method diagram of a defrosting lamp heater protection cover of an embodiment of the defrosting device according to the present invention. ((A) Schematic view, (b) Side view)

FIG. 9 is a shape diagram of a defrosting lamp heater protection cover of an embodiment of the defrosting device according to the present invention. ((A) Schematic view, (b) Side view)

FIG. 10 is a shape diagram of a defrosting lamp heater protection cover of an embodiment of the defrosting device according to the present invention. ((A) Schematic view, (b) Side view)

FIG. 11 is a diagram showing a conventional defrosting device. ((A) Front view, (b) Side sectional view)

FIG. 12 is a diagram showing a conventional defrosting device.

FIG. 13 is a diagram of a radiant heat heater and a heater protection cover of a conventional defroster.

[Explanation of symbols]

 1 Freezer 2 Evaporator 3 Defrosting lamp heater protection cover 4 Defrosting lamp heater 5 Internal circulation fan 6 Drain pan 7 Drain pipe 8 Duct 9 Temperature sensor 10 Holding plate 21 Defrosting lamp heater protection cover 22 Drain discharge Road 23 Defrost lamp heater protective cover 24 Defrost lamp heater protective cover 25 Defrost lamp heater protective cover 26 Defrost lamp heater protective cover 27 Defrost lamp heater protective cover 28 Defrost lamp heater protective cover 29 Defrosting lamp heater protection cover 101 Freezer compartment 102 Evaporator 103 Defrosting infrared heater protection cover 104 Defrosting infrared heater 105 Internal circulation fan 106 Drain pan 107 Drain pipe 108 Duct 109 Temperature sensor 110 Holding plate 111 Evaporator 112 Heater protection cover 13 radiant heat heater

Claims (5)

[Claims] 1. A defrosting device, wherein a defrosting lamp heater is installed on a lower surface of an evaporator, and a defrosting lamp heater protection cover is installed between the evaporator and the lamp heater. Is processed to absorb the light energy emitted by the lamp heater, and the heat collected on the front surface of the defrosting lamp heater protective cover is radiated. Defroster 2. The defroster for an evaporator for a cooler according to claim 1, wherein a far-infrared lamp heater having a radiant light wavelength peak of 5.5 μm is used as the lamp heater. 3. A defrosting device, wherein a defrosting lamp heater is installed on the bottom surface of the evaporator, and a defrosting lamp heater protection cover is installed between the evaporator and the lamp heater. A defrosting device for an evaporator for a cooler, which has a configuration including an inclined portion or a curved portion. 4. The defrosting device for an evaporator for a cooler according to claim 3, wherein the defrosting lamp heater protection cover is subjected to a hydrophobic treatment. 5. The defrosting device for an evaporator for a cooler according to claim 4, wherein the hydrophobic treatment is performed by processing fluorine or silicon.