JP2005241110A - Ice making machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ice making machine comprising an ice tray having high heat conductivity and corrosion-proof property, and exercising antibacterial property with low material cost and manufacturing cost. <P>SOLUTION: In this ice making machine wherein a cooling plate 26 is integrally or closely attached to the ice tray 2 made out of aluminum and having a number of cubes 23, and ice blocks are made while supplying water into the cubes 23, at least inner faces of the cubes 23 of the ice tray 25 is treated by "mitani light(R)", a "mitani light" treatment layer may be formed on an interface between the ice tray 25 and the cooling plate 26 when necessary, and further a heat insulating layer S formed by adhering a laminate sheet of metallic foil/plastic to an outer face of a plastic foamed body, may be formed on an outer face formed by integrally or closely attaching the cooling plate 26 to the ice tray 25. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an ice making machine provided with an ice tray in which heat conductivity is improved and a large number of cubes are formed.

  As shown in FIG. 2, the ice making machine includes a water supply tank 21, a pump 22 that supplies the clean water, a water conduit 24 that guides the supplied clean water to the cube 23, as shown in FIG. 2. The ice making tray 25 that constitutes the cube 23 and a cooling plate 26 that is an evaporator, and the clean water supplied from the nozzle 27 of the water conduit 24 toward the cube 23 freezes and grows into ice pieces. Is completed, the table 28 is inclined with the hinge 29 as an axis, and the cube 23 is slightly heated to discharge the ice pieces. In the figure, L is a supply pipe for clean water, and P is a drain tray.

  Several means for increasing the ice making efficiency of the ice making machine configured as described above can be considered, and one of them is to improve the thermal conductivity of the ice making tray.

  Common ice trays are made of aluminum and have anodized inner surface of the cube to provide corrosion resistance. To improve thermal conductivity, the inner surface of the cube is tinned with copper. However, the former has a low thermal conductivity and there is a problem that the thermal conductivity is further lowered by anodizing the surface. The latter has a good thermal conductivity but a high material cost, wear resistance and scratches. There are problems that wrinkles easily enter and that there is a possibility that patina may be generated when wrinkles enter the tin plating layer.

The inventor has been searching for various materials and techniques to solve the above-mentioned problems of the prior art, and the specific synthetic resin enters the micropores present in the alumite film to form a very strong film, and further In addition, it is immersed in a metal ion (silver ion) bath and electrolytically impregnated with metal ions, so that the thermal conductivity of the ice tray is equivalent to copper, has corrosion resistance, and exhibits antibacterial properties due to silver ions. I learned that there is a product name “Mitanilite” of Nippon Alumina Processing Co., Ltd. as something that does not lead to high material costs and manufacturing costs.

  In order to confirm the effect of the above-mentioned “mitanilite”, an aluminum plate having a length of 30 × 30 cm and a thickness of 0.8 mm is prepared, and a 100 μm treatment film is formed on both sides and one side of the aluminum plate by “mitanilite”. As shown in FIG. 3, a heater 37, a stirring fan motor 38, and a radiant heat shielding plate are placed in a tank having an internal size of 25 × 25 × 35 cm surrounded by a heat insulating wall 36. The sample is placed in the upper opening of the test tank 30 in which 39 is disposed, the first thermocouple 31 on the outer surface of the sample, the second thermocouple 32 on the inner surface, the third thermocouple 33 in the middle of the tank, and the fourth on the heater. Table 1 shows the results of measuring the heat transfer state by arranging the thermocouple 34 and the fifth thermocouple 35 outside the tank.

The results of calculating the heat reflux rate: K = W / AΔT from the above test data are shown in the lower column of Table 1.
Where W is the power consumption of the heater, A is the heat receiving area of the sample, and ΔT is the temperature difference between the inner and outer surfaces of the sample.

  Based on the above knowledge, the present invention has an object to provide an ice making machine provided with an ice tray that has the same thermal conductivity as copper, has good corrosion resistance, exhibits an antibacterial effect, and does not increase material costs and manufacturing costs. And

  In order to solve the above-mentioned problems, the present invention has a cooling plate integrated or closely arranged in an ice tray made of aluminum formed with a large number of cubes, and ice pieces are formed while supplying clean water into the cube. In the ice making machine, at least the inner surface of the ice tray is subjected to a surface treatment with the product name “Mitanilite” of Nippon Alumina Processing Co., Ltd., and if necessary, the interface between the ice tray and the cooling plate. In addition, the above-mentioned “mitanilite” treatment layer can be formed, and a metal foil / plastic laminate sheet is bonded to the outer surface of the plastic foam on the outer surface where the cooling plate is integrated or closely disposed on the ice tray. An insulating layer can be provided.

  According to the present invention configured as described above, an anodized film is formed on the cube inner surface of an ice tray immersed in an electrolytic solution containing a specific synthetic resin, and the fine pores of the formed anodized film have the above-mentioned A specific synthetic resin penetrates to improve heat conductivity and corrosion resistance. Moreover, after forming the said anodized film, an antibacterial effect comes to be exhibited by immersing in the electrolyte solution containing a metal ion (silver ion). The thickness of the treatment layer by the “mitanilite” is preferably in the range of 100 μm to 300 μm. When the thickness is small, improvement in thermal conductivity cannot be expected, and it is not preferable from the economical viewpoint to make the thickness more than the above.

  In addition, the outside of the portion where the ice tray and the cooling plate are integrally or closely arranged (the upper side in the drawing) is a cold air discharge surface, and therefore a heat insulating layer is preferably provided. It is more effective if a polyethylene laminate sheet is attached.

Next, embodiments of the present invention will be described with reference to the drawings. The basic structure of an ice machine is shown in Fig. 2.
As described with reference to FIG. 1, the difference is that the 100 μm film 20 is formed by “mitanilite” on the inner surface of the cube 23 of the ice tray 25 as shown in FIG.

  Next, the ice maker according to the present invention and the ice maker according to the prior art are compared. A structure in which an inner surface of a cube 23 of an ice making tray 25 of an ice making machine equipped with a 370 W refrigerator having a capacity of 45 kg / day is attached with a 100 μm film 20 made of “mitanilite”, and a conventional ice making tray Table 2 shows the results of measuring the time required for ice making and the power consumption of both of them prepared with (aluminum cube inner surface anodized).

  In the above embodiment, a heat insulating layer is not provided on the upper outer surfaces of the ice tray 25 and the cooling plate 26, but the outside of the ice tray 25 and the cooling plate 26 (upper side in the drawing) is a cold air discharge surface. It is preferable to provide the heat insulating layer S, and it is more effective to use a heat insulating layer having an aluminum / polyethylene laminate sheet attached to the outer surface thereof.

  As described above, the ice making machine according to the present invention does not lead to an increase in the material cost and manufacturing cost of the ice tray adopted in the ice making machine, and the thermal conductivity and corrosion resistance are improved, and the antibacterial property is exhibited and has high industrial utility value. Is.

(A) perspective view, (b) same sectional view of ice tray according to this invention Explanation of the main mechanism of an ice machine Explanatory drawing of thermal conductivity test equipment

Explanation of symbols

20 Film (mitanilite treatment)
21 Water supply tank 22 Pump 23 Cube 24 Water conduit 25 Ice tray 26 Cooling plate 27 Nozzle 28 Table 29 Hinge 30 Test tank 31 First thermocouple 32 Second thermocouple 33 Third thermocouple 34 Fourth thermocouple 35 Fifth Thermocouple 36 Heat insulation wall 37 Heater 38 Stirring fan motor 39 Radiation heat shield plate L Supply water supply line P Drain pan S Heat insulation layer

Claims (4)

  In an ice making machine in which a cooling plate is integrated or closely arranged on an aluminum ice tray made of a large number of cubes and ice pieces are formed while supplying clean water into the cube, at least the cube of the ice tray An ice making machine characterized in that the inner surface is subjected to surface treatment with a product name “Mitanilite” of Nippon Alumina Processing Co., Ltd.   2. The ice making machine according to claim 1, wherein the “mitanilite” treatment layer is formed at an interface between the ice tray and the cooling plate.   The ice making machine according to claim 1 or 2, wherein a heat insulating layer is formed on an outer surface of the ice tray in which a cooling plate is integrally or closely arranged.   4. The ice making machine according to claim 1, wherein the heat insulating layer is formed by bonding a laminated sheet of metal foil / plastic film to an outer surface of a plastic foam.

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