JP2018028422A - Automatic ice-making machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ice-making machine, which is made reluctant to receive the influences of a local distortion due to a soldering by a torch and torch uneven heat by caulking means to crush and joint the caulked portion, and a mechanical stress, so that ice can drop smoothly from an ice making chamber at the time of an ice removing run.SOLUTION: In an ice-making part of an automatic ice-making machine, the ice-making part composed of a cooling plate 14 and an ice-making frame 13 is subjected to an electroless nickel-phosphorous plating coat, and the surface roughness Ra of the electroless nickel-phosphorous plating coat is made to have an arithmetic average roughness Ra (arithmetic mean roughness) at or less than 0.4 μm so that an ice making chamber has the cooling part 14 and the ice-making frame 13 hard-soldered in a heating furnace.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an automatic ice making machine, and more specifically, in an automatic ice making machine in which an ice making frame is provided on a cooling plate provided with an evaporation tube to define an ice making chamber, a corrosion-resistant coating applied to the ice making chamber. The present invention relates to a technique capable of effectively preventing the phenomenon that ice does not smoothly fall out of the ice making chamber during the deicing operation due to the degree of surface roughness.

  Automatic ice makers that produce a large number of ice blocks and plate ice are widely used in kitchens such as coffee shops and restaurants, and other facilities such as fish banks and fishing vessels. In this automatic ice making machine, various ice making mechanisms have been put into practical use according to the ice making principle employed in the ice making section. For example, in order to manufacture a dice-shaped ice block, an ice making chamber with its interior partitioned into a large number of ice making chambers (cells) is provided facing downward, and the lower portion of the ice making chamber is closed with a water tray that can be opened and closed. Closed-cell ice makers that grow ice blocks by spraying ice making water into each ice making chamber are widely used. The structure of the ice making chamber is the same as the closed cell type described above, but does not have the water dish that closes the ice making chamber, and an open cell type that directly injects ice making water into each ice making chamber to produce ice blocks. Ice machines are also used.

  Furthermore, a rectangular box body that is not divided by an ice making chamber is used as an ice making chamber, and ice ice water is supplied to the rectangular box body that is opened downward to produce plate ice inside the rectangular box body. There is also an automatic ice maker of the type. All of the three types of automatic ice making machines described above were of the type in which the ice making chambers were arranged horizontally and the opening portion was directed downward. However, the ice making units were arranged vertically to the ice making unit. A flow-down type ice maker that supplies ice-making water from above has also been put into practical use. In other words, a large number of ice-making chambers are partitioned on a cooling plate having an evaporation tube connected to the refrigeration system on the back surface, and an ice-making unit is arranged vertically, and the ice-making unit is arranged vertically (some models are arranged obliquely). It is.

  Since the present invention can be applied to an automatic ice making machine adopting any of the above-described ice making methods, the basics of the ice making mechanism will be described below by taking a closed cell type ice making mechanism as an example. As shown in FIG. 3, for example, the open cell ice making machine has an ice making chamber 12 in which a large number of ice making chambers 10 opening downward are defined, and a freezing plate (top plate) 14 in the ice making chamber 12 is frozen. An evaporation pipe 18 led out from the system 16 is closely arranged in a meandering manner. In the present specification, the ice making chamber 12 is constituted by the cooling plate 14 and an ice making frame 13 made of a side plate provided at each edge of the cooling plate 14, and is constituted by the members. The whole is referred to as an ice making unit 15. The refrigeration system 16 includes a compressor 20 that compresses the refrigerant flowing in the pipe line 17, a condenser 24 that condenses the refrigerant, an expansion valve 22 for the refrigerant, the evaporation pipe 18 that is connected to the expansion valve 22, and the condenser 24. An air cooling fan 26 and the like are provided. During the ice making operation, the ice making chamber 12 is cooled to below the freezing point by opening the expansion valve 22 and supplying a refrigerant to the evaporation pipe 18. A bypass pipe 28 is connected to the discharge side of the compressor 20 and the refrigerant inlet of the evaporation pipe 18, and the hot gas valve 30 provided in the bypass pipe 28 is opened during the deicing operation so that the evaporation is performed. The ice making chamber 12 is heated by supplying hot gas (high temperature refrigerant) to the pipe 18.

  More specifically, the ice making unit 15 shown in FIG. 4 is of a so-called closed cell type in which the ice making chamber is closed from below by a water dish. That is, an ice making unit 34 is disposed in the upper part of the ice making unit 15 shown in FIG. 4, and an ice storage chamber (not shown) for storing a large number of ice blocks produced and dropped by the ice making unit 15 in the lower part of the inside. Is provided. In the ice making unit 15, the ice making chamber 12 is fixed below a beam member 36 disposed horizontally in the housing 32, and a large number of ice making chambers 10 are opened directly below. Further, in FIG. 4, a support shaft 40 is horizontally inserted into a bracket 38 that hangs down to the left side of the beam member 36, and the support shaft 40 supports a water dish 42 so as to be inclined obliquely downward. Each of the 12 ice making chambers 10 is closed from below. Here, the water tray 42 includes a water tray main body 46 that closes the ice making chamber 12 from below, and an ice making water tank 48 that is integrally provided at a lower portion of the water tray main body 46. A number of injection holes 44 corresponding to each ice making chamber 10 are formed on the upper surface of 46.

  When shifting to the ice making operation, the water tray 42 is moved to the horizontal position by the actuator 50 shown in FIG. 4 to close the ice making chamber 12 from below. Further, the ice making water in the tank 48 is pumped by an ice making water pump 52 shown in the figure, and is sprayed and supplied from the injection holes 44 in the water tray 42 to the corresponding ice making chambers 10. Grow. When the completion of ice making is detected and the operation is shifted to the deicing operation, the actuator 50 reverses and forcibly tilts the water tray 42 to open the ice making chamber 12. Also, the hot gas valve 30 shown in FIG. 3 is opened, hot hot gas from the compressor 20 is supplied to the evaporation pipe 18, and the ice making chamber 12 is heated. As a result, the ice blocks formed in each ice making chamber 10 fall from the ice making chamber 10 by their own weight and are stored in the ice storage chamber (not shown).

  FIG. 5 is an exploded perspective view of the ice making unit 15 shown in FIG. 4, in which an ice making frame 13 constituting the outside of the ice making unit 15 and a grid-like partition disposed inside the ice making frame 13 are shown. 56 in a separated state. The ice making frame 13 is composed of a rectangular cooling plate 14 and side plates 58 provided at the end edges thereof, and each side plate 58 is joined to the cooling plate 14 to form a rectangular box. The cooling plate 14 is provided with an evaporation pipe 18 led out from the refrigeration system 16 in a meandering manner.

  For example, as shown in FIG. 6, the partition 56 combines a plurality of horizontal partition plates 60 and vertical partition plates 62, and partitions the interior in a lattice shape to define a space that becomes the plurality of ice making chambers 10. It is made. That is, the slits 60a are formed at the lower end edge of the horizontal partition plate 60 at predetermined intervals, and the slits 62a are also formed at the upper end edge of the vertical partition plate 62 at predetermined intervals, so that the slit 60a of each horizontal partition plate 60 is formed. Is inserted into the slit 62a of the corresponding vertical partition 62 to obtain a grid-like partition 56 shown in FIG. Here, in both the horizontal partition plate 60 and the vertical partition plate 62, the portion of the ice making frame 13 that is in contact with the back surface of the cooling plate 14 is formed by a straight line, and does not have a caulking joining projection. However, although not shown, a caulking projection is provided on the lateral partition plate 60 and a caulking hole is provided at a corresponding position of the cooling plate 14, and after the two members 60 and 14 are combined, the caulking projection is caulked and crushed. In some cases, bonding is also possible. The cooling plate 14, the ice making frame 13, and the partition 56 are all preferably made of copper having good thermal conductivity. However, other metal or alloy materials may be used as long as the thermal conductivity is good. In addition, the components such as the cooling plate 14, the ice making frame 13, the partition 56, and the evaporation pipe 18 are degreased and cleaned completely before assembling them.

  Here, the ice-making chamber 12 is obtained inside the ice-making frame 13 by arranging and joining the grid-like partition bodies 56 inside the cooling plate (top plate) 14 and the ice-making frame 13. . The ice making frame 13 and the partition 56 are joined by so-called brazing. Here, as means for joining two metals, “soldering” using an alloy “solder” mainly composed of tin and lead as a bonding agent, and “brazing material” of various alloys having a melting point lower than that of the base material. And "brazing" using as a bonding agent. Both “soldering” and “brazing” are academically a type of welding, and the case where a bonding agent (soft brazing) with a melting point of 450 ° C. or less when heated with a torch is called “soldering” The case where a bonding agent (hard solder) having a melting point of 450 ° C. or higher is generally referred to as “brazing”. In the present invention, a case where a hard solder is used is referred to as so-called “brazing”.

JP-A-2005-226887

  The surface of the cooling plate 14, the ice making frame 13, and the partition 56 constituting the ice making unit 15 shown in FIGS. 3 to 6 is subjected to a treatment for forming a hot tin plating film mainly for rust prevention. The molten tin plating is performed by immersing the ice making part 15 in a plating tank containing molten tin metal (plating bath) and then taking it out to solidify the molten tin metal on the surface of the ice making part 15. Done. That is, a good plating skin can be obtained by applying tin plating to the ice making part 15 over the entire surface. In this case, the surface roughness (parameter) of the plating film applied to the inner surface of each ice making chamber (cell) 10 shown in FIG. 4 is JIS B 0601 (1994) and JIS B 0031 (1994) defined in Japanese Industrial Standards. ) Is about “1.0 μm”.

  In addition, in order to join the cooling plate 14, the lattice-like partition 56 and the ice making frame 13 constituting the ice making part 15, brazing with a torch, or caulking joining after the caulking part is inserted into the caulking hole. Has been done. However, when brazing with a torch, for example, the heating of the cooling plate 14 and the partition 56 becomes localized, so that the inside of the ice making chamber 12 is distorted. Further, in the case of the caulking joining, when the caulking is mechanically performed, the inside of the ice making chamber 12 may be distorted. For this reason, after brazing or caulking with these torches, a process of correcting and removing the generated distortion is required. However, the distortion correction is not always complete, and the distortion often remains in the ice making chamber 12.

  The fact that the plating film applied to the inner surface of the ice making chamber 12 described above has an arithmetic average roughness (Ra) of JIS standard of about “1.0 μm” means that it is generated in the ice making chamber 12 at the end of the deicing operation. This means that a considerable amount of surface resistance is generated when the ice mass falls off due to its own weight. In addition, as shown in FIG. 5, the evaporation pipe 18 arranged in close contact with the cooling plate 14 has a temperature difference between the refrigerant inlet side and the outlet side. That is, in the deicing step, the hot gas valve 30 of the refrigeration system 16 shown in FIG. 3 is opened and hot gas (high-temperature refrigerant) from the compressor 20 is sent directly to the evaporation pipe 18 to heat the ice making unit 15. By melting the freezing surface of the ice, the fall of the ice is promoted. However, the hot gas has the highest temperature on the inlet side of the evaporation pipe 18, but a temperature drop occurs during the heat exchange through the evaporation pipe 18, and the temperature drops considerably on the outlet side.

  This will be described with reference to FIG. The ice making frame 13 shown in FIG. 2 supplies ice making water from below to generate ice, but the ice making frame 13 is not provided with the grid-like partition plate. Accordingly, large plate ice 19 is generated in the ice making chamber 12 in the ice making frame 13. In this case, assuming that the roughness of the plating film inside the ice making frame 13 is “1.0 μm” in arithmetic mean roughness (Ra) according to JIS standard, the ice 19 is removed from the ice making frame 13 during the deicing operation. Even if it tries to fall by its own weight, as described above, since the surface resistance inside the ice making chamber 12 is large, the smooth fall is inhibited. Moreover, as described above, the high-temperature refrigerant flowing into the evaporation pipe 18 is hotter on the inlet side, but the temperature is lost by heat exchange while flowing, and the temperature is considerably lowered on the outlet side. That is, in the deicing step, the two conditions are combined, and the evaporation pipe 18 of the ice making frame 13 in FIG. 2A has a high hot gas temperature on the inlet side. Heated heavily. Accordingly, the ice 19 on the inlet side (left side in the figure) of the evaporation pipe 18 falls from the ice making frame 13 while being inclined by its own weight. Next, as shown in FIG. 2 (b), the ice 19 starts to fall from the outlet side (right side in the figure) of the evaporation pipe 18 (the ice 19 on the inlet side is slightly retracted), and finally FIG. As shown in (c), the ice 19 falls from the ice making frame 13. The ice making frame 13 shown in FIG. 2 does not include a grid-like partition as described above. However, as shown in FIG. 5, a lattice-like partition 56 is provided inside the ice making frame 13 to provide a large number of ice making frames. The chamber 10 may be defined. In this case, the ice generated in each ice making chamber 10 in the ice making unit 15 is in a state of being connected to each other with a rib-like portion at the open end of the partition 56. Therefore, if the inner surface of the ice making chamber 10 is rough, the ice connected by the ribs can be held by the partition 56 that defines each ice making chamber 10 and is difficult to fall during the deicing operation.

  As described with reference to FIG. 2, if the inner surface of the ice making chamber 12 is rough, it takes time until the ice 19 on the outlet side of the evaporation pipe 18 that is slowly deiced starts to fall by its own weight. In addition, the ice 19 is caught in the ice making chamber 12 because the entrance side first falls largely diagonally. That is, the ice 19 is melted more than necessary, or the deicing process ends without the ice 19 partially falling. For example, in a closed cell type automatic ice maker, the water tray 42 and the ice making chamber 12 are used. Ice 19 may bite between the two. Moreover, as mentioned above, the ice making part 15 will be distorted by the process which crushes a partition plate at the time of caulking joining, or the local heating by torch brazing. Therefore, distortion correction is required, but when this distortion correction is not sufficient, when the ice 19 falls from the ice making chamber 12 in the deicing process, a large deviation occurs between the inlet side and the outlet side of the evaporation pipe 18, It had the same drawbacks as described above.

In order to solve the problem and achieve the intended object, the invention according to claim 1
An ice making part having an ice making frame on the cooling plate and defining an ice making chamber inside;
An evaporator tube disposed on the cooling plate for circulating the refrigerant supplied from the refrigeration system to cool the ice making chamber;
An ice making water supply unit that circulates and supplies ice making water to the ice making chamber;
An electroless nickel-phosphorous plating film is applied to the ice making part composed of the cooling plate and the ice making frame, and the surface roughness Ra (arithmetic average roughness) of the electroless nickel-phosphorous plating film is 0.4 μm. The summary is as follows.
According to the first aspect of the present invention, the surface roughness Ra of the plating film on the inner surface of the ice making chamber that is in contact with the ice produced by the ice making operation can be suppressed to 0.4 μm or less in terms of JIS arithmetic average roughness. As a result, the ice falls smoothly from its ice making chamber during its deicing operation.

The gist of the invention described in claim 2 is that the cooling plate and the ice making frame use hard solder as a joining material and are hard soldered in a heating furnace.
According to the second aspect of the invention, since the cooling plate and the ice making frame are entirely heated by brazing in the furnace, the ice falls smoothly from the ice making chamber without any distortion remaining.

  According to a third aspect of the present invention, the ice making frame includes a partition body formed by assembling a plurality of horizontal partition plates and vertical partition plates in a lattice shape, and a frame body as a side plate surrounding the partition body from the outside. It is made up of the following.

  According to a fourth aspect of the present invention, the ice making water supply unit is arranged below the ice making unit with the ice making chamber opened downward, and supplies ice making water to the ice making chamber during ice making operation. It is a summary.

  The invention according to claim 5 is characterized in that the ice making water supply unit is arranged above the ice making unit and supplies ice making water to the ice making chamber from above during ice making operation. .

  According to the present invention, in an automatic ice making machine in which an ice making frame is provided on a cooling plate provided with an evaporation tube to define an ice making chamber, the degree of surface roughness of the anticorrosion coating applied to the ice making chamber is reduced. As a result, there may be a phenomenon in which ice does not fall off smoothly from the ice making chamber during the deicing operation. However, when the coating film is an electroless nickel-phosphorus plating film and the surface roughness of the coating film is 0.4 μm or less, the ice falls smoothly.

It is sectional drawing which shows the state in which the ice in the ice making part to which the Example of this invention is applied falls in order of (a)-(c). It is sectional drawing of the ice making part comprised with the cooling plate and ice-making frame which provided the evaporation pipe, Comprising: (a) shows the state where the ice of the site | part close | similar to the inlet of an evaporation pipe begins to fall from an ice making chamber first, (b ) Shows a state in which ice begins to fall from a portion on the outlet side of the evaporation tube, and (c) shows a state in which the ice falls from the ice making unit by its own weight. It is explanatory drawing which shows the basic structure of the ice making part in an injection type ice making machine, and the basic composition of the freezing system which supplies a refrigerant | coolant to the evaporation pipe provided in this ice making part. It is a partially cutaway side view of a closed cell type automatic ice making machine having an ice making chamber to which an embodiment of the present invention is applied. It is a perspective view of the ice making part shown in FIG. 4, Comprising: The state which decomposed | disassembled into the ice making frame and partition which have the cooling plate which arrange | positioned the evaporator in the upper part is shown. It is a perspective view which shows the partition shown in FIG. 5 in the state decomposed | disassembled into the vertical direction partition and the horizontal direction partition.

  Next, preferred embodiments of the present invention will be described below. Note that the object of the present invention is not limited to the closed cell type and open cell type ice making machines in which the ice making units are arranged horizontally, as described above, and the ice making units are arranged vertically or diagonally. A flow-down type ice making machine that supplies ice making water to the ice making unit from above is also included. In addition, regarding the above-mentioned solution problems, (1) a solution caused by the surface roughness of the plating film applied to the inner surface of the ice making chamber is described in Example 1, and (2) the torch in the process of manufacturing the ice making part A solution when the distortion correction of the ice making part is not sufficient due to the use of brazing will be described in Example 2.

[Example 1]
When the ice making frame 13 and the partition 56 are joined by brazing, a flux residue adheres to the surface of the ice making portion 15. Therefore, the surface of the ice making chamber is cleaned by washing away the flux residue with a cleaning agent or water, or by physically scraping it off by means such as sandblasting. Next, an electroless nickel-phosphorus plating film is applied to the surface of the ice making unit 15 (all of the ice making frame 13 and the inner and outer surfaces of the partition 56) after the surface cleaning process. In this case, the electroless nickel-phosphorous plating specification is such that the phosphorus concentration is 10% or more (high phosphorus type) and the film thickness is 15 μm or more. That is, the nickel-phosphorus plating film is for enhancing the corrosion resistance of the ice making chamber 12, and as a result of performing a corrosion resistance confirmation test, it is known that the thickness is 15 μm or more. In the corrosion resistance test, 5% NaCl + 0.5% HCl aqueous solution is used as a test solution, and the test solution is sprayed onto a test piece at a test bath temperature of 35 ° C., and the test solution is exposed to a high temperature necessary for brazing. According to accelerated test.

  The electroless nickel-phosphorus plating film treatment is performed by a so-called plating bath in which the ice making part 15 is completely immersed in a nickel-phosphorus plating solution storage tank. At this time, as a base treatment for the electroless nickel-phosphorous plating that is the outermost layer, after plating the surface of the ice making part 15 with nickel, palladium, or the like, electroless nickel-phosphorous plating is performed on the surface. It is good also as a layer process. Further, a three-layer process may be performed in which the surface of the ice making part 15 is plated with copper, then nickel is plated, and then the electroless nickel-phosphorus plating is performed on the nickel plating. When soldering with the soft solder, the deposition of electroless plating such as tin and lead is hindered (catalytic poison). Therefore, as with the two-layer or three-layer plating, nickel is applied to the base of the ice making part 15. There is a high need for plating or copper plating.

  When the above-described plating film is processed in two layers or three layers, if the electroless nickel-phosphorous plating has a film thickness of 15 μm or more, the lowermost plating film may be made extremely thin, for example, 1 μm. good. In addition, when the said film is smaller than 15 micrometers, the pinhole which reaches a base may be produced, and even if it performs the said electroless nickel-phosphorus plating, high corrosion resistance is not acquired.

  When the electroless nickel-phosphorous plating is produced in the ice making part 15, the plating deposition rate is set to 10 μm / hr (in consideration of the concentration of nickel-phosphorous plating solution, pH, temperature of the plating bath, etc. The range is adjusted to 12 μm / hr or less. Thereby, the surface roughness Ra (arithmetic mean roughness according to JIS) of the electroless nickel-phosphorous plating applied to the ice making part 15 can be reduced to 0.4 μm or less.

  Thus, when the surface roughness Ra of the electroless nickel-phosphorous plating applied to the ice making part 15 is 0.4 μm or less, the ice 19 from the ice making chamber 12 in the ice making part 15 is removed as shown in FIG. The fall is made smoothly. That is, as shown in FIG. 1A, the ice 19 is slightly displaced from the ice making chamber 12 between the refrigerant inlet side and the outlet side of the evaporation pipe 18. For this reason, as shown in FIGS. 1B and 1C, the ice 19 does not get caught on the inner surface of the ice making chamber 12, and keeps a parallel posture with respect to the ice making portion 15 located horizontally, and gravity is maintained. Will drop more smoothly. Therefore, the ice 19 as described in the problem to be solved is not caught by the ice making chamber 12 and melted excessively. In addition, when the water tray 42 is used, there is no inconvenience that an ice biting occurs between the water tray 42 and the ice making unit 15, and the falling speed of the ice 19 during the deicing operation is shortened.

[Example 2]
As described with reference to FIG. 5, when the ice plate 15 is formed by joining the cooling plate 14, the ice making frame 13, and the partition 56, joining by hard brazing is performed in a heating furnace in the second embodiment. is there. That is, when brazing, the ice making unit 15 is entirely heated by a heating furnace so that distortion due to local heating does not occur. In addition, about the procedure at the time of brazing and joining the said partition body 56 and the ice making frame 13, since it is disclosed by Unexamined-Japanese-Patent No. 2006-118816, for example, the procedure before a heating is made into a bullet item below. .
(1) First, all parts used are degreased and cleaned.
(2) Use a partition plate that does not have caulking projections and a cooling plate that does not have caulking holes.
(3) Combine the partition plates in a grid pattern.
(4) A partition plate is disposed on the cooling plate.
(5) A brazing material is arranged to join the partition plate and the ice making frame by brazing. At this time, a sheet-like material (foil), a rod-like material, a linear material may be disposed, or a paste-like material may be applied.
(6) Brazing joining is performed by passing an ice making chamber through a heating furnace set to a brazing temperature. At this time, if the evaporator tube and other parts are joined together by brazing, all of them can be joined at once.
(7) The ice making part after joining is removed because flux residue and the like are adhered to the surface. For removal, it may be washed with a cleaning agent, water or hot water, or physically removed by sandblasting or the like.

  When joining is performed by overall heating by brazing in the furnace, the clearance of a jig (not shown) is set so as not to contact even by thermal expansion, and the flatness after joining is set to 0.6 mm or less. As a result, the ice displacement between the inlet side and the outlet side that occurred when the ice from the ice making room falls is small, and the ice falls smoothly, so that the ice is caught and melts excessively, or the ice bites. Can be eliminated. Also, the time from when the exit side started to fall and the whole ice slipped was shortened.

12 ice making room, 13 ice making frame, 14 top plate (cooling plate), 15 ice making unit, 16 refrigeration system,
18 evaporating pipe, 56 partition, 58 side plate (frame), 60 lateral partition plate,
62 Vertical divider

Claims (5)

An ice making part (15) in which an ice making frame (13) is provided on the cooling plate (14) to define an ice making chamber (12) inside;
An evaporation pipe (18) disposed on the cooling plate (14), for circulating the refrigerant supplied from the refrigeration system (16) to cool the ice making chamber (12),
An ice-making water supply unit that circulates and supplies ice-making water to the ice making chamber (12),
The ice making part (15) comprising the cooling plate (14) and the ice making frame (13) is provided with an electroless nickel-phosphorous plating film, and the surface roughness Ra ( An automatic ice maker characterized by an arithmetic average roughness of 0.4 μm or less.   The automatic ice maker according to claim 1, wherein the cooling plate (14) and the ice making frame (13) are made of hard solder as a joining material and are hard soldered in a heating furnace.   The ice making frame (13) includes a partition body (56) formed by assembling a plurality of lateral partition plates (60) and longitudinal partition plates (62) in a lattice pattern, and the partition body (56) from the outside. The automatic ice maker according to claim 1 or 2, comprising a frame (58) as a surrounding side plate.   The ice making water supply unit is arranged below the ice making unit (15) with the ice making chamber (12) opened downward, and supplies ice making water to the ice making chamber (12) during ice making operation. The automatic ice making machine according to any one of claims 1 to 3.   The ice making water supply unit is arranged above the ice making unit (15) and supplies ice making water from above to the ice making chamber (12) during ice making operation. The automatic ice maker according to one item.

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