WO2016181702A1 - 自動製氷機 - Google Patents
自動製氷機 Download PDFInfo
- Publication number
- WO2016181702A1 WO2016181702A1 PCT/JP2016/058191 JP2016058191W WO2016181702A1 WO 2016181702 A1 WO2016181702 A1 WO 2016181702A1 JP 2016058191 W JP2016058191 W JP 2016058191W WO 2016181702 A1 WO2016181702 A1 WO 2016181702A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- ice making
- side plate
- outer frame
- making chamber
- ice
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25C—PRODUCING, WORKING OR HANDLING ICE
- F25C1/00—Producing ice
- F25C1/22—Construction of moulds; Filling devices for moulds
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/31—Coating with metals
- C23C18/32—Coating with nickel, cobalt or mixtures thereof with phosphorus or boron
- C23C18/34—Coating with nickel, cobalt or mixtures thereof with phosphorus or boron using reducing agents
- C23C18/36—Coating with nickel, cobalt or mixtures thereof with phosphorus or boron using reducing agents using hypophosphites
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/008—Soldering within a furnace
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/48—Coating with alloys
- C23C18/50—Coating with alloys with alloys based on iron, cobalt or nickel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25C—PRODUCING, WORKING OR HANDLING ICE
- F25C1/00—Producing ice
- F25C1/04—Producing ice by using stationary moulds
- F25C1/045—Producing ice by using stationary moulds with the open end pointing downwards
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
- F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
- F28F19/06—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings of metal
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25C—PRODUCING, WORKING OR HANDLING ICE
- F25C2400/00—Auxiliary features or devices for producing, working or handling ice
- F25C2400/12—Means for sanitation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25C—PRODUCING, WORKING OR HANDLING ICE
- F25C2600/00—Control issues
- F25C2600/04—Control means
Definitions
- the present invention relates to an automatic ice making machine for continuously producing ice blocks by supplying ice making water to an ice making part cooled by an evaporator, and more specifically, can improve the corrosion resistance of the ice making part. It relates to a coating.
- An automatic ice making machine that continuously produces a large amount of ice blocks is suitably used in facilities such as coffee shops and restaurants and other kitchens.
- These automatic ice makers include a jet type automatic ice machine that continuously produces ice of the required shape by supplying ice making water from below to a large number of ice making chambers that open downward, and an upper surface of an inclined ice making plate.
- This closed cell type ice making mechanism 13 includes an ice making chamber 10 as an ice making section in which a large number of ice making chambers 12 opening downward are defined, and a tiltable water dish 40 is provided below the ice making chamber 10.
- the pivot 42 is pivotally supported.
- An ice making water tank 44 for storing ice making water supplied from the water supply unit 43 is integrally provided at the lower portion of the water tray 40.
- An evaporator 48 led out from the refrigeration system 46 is meanderingly disposed on the upper surface of the ice making chamber 10, and the refrigerant from the refrigeration system 46 is circulated and supplied to the evaporator 48, so that the ice making chamber 10 is brought to below the freezing point. It is designed to cool.
- the refrigeration system 46 includes a compressor CM, a condenser CD, and an expansion valve EV.
- the discharge side of the compressor CM and the suction side of the evaporator 48 are connected by a bypass pipe 50, and a hot gas valve HV is provided in the bypass pipe 50.
- the ice making water is sprayed and supplied from the water tray 40, which has closed the ice making chamber 12 from below, to each ice making chamber 12, so that ice blocks are forcibly cooled in the ice making chamber 12. Is formed. Further, during the deicing operation, the water tray 40 is tilted obliquely downward to open the ice making chamber 12, and the hot gas valve HV is opened to supply hot gas from the compressor CM to the evaporator 48. As a result, the icing between the ice making chamber 12 and the ice block is melted, and the ice block is dropped to the ice storage chamber located below by its own weight.
- FIG. 12 is an exploded perspective view of the ice making chamber 10 installed in the automatic jet ice making machine.
- the ice making chamber 10 is basically composed of a box-shaped outer frame 14 opened downward, and a lattice-shaped partition member 30 disposed inside the outer frame 14 and defining the plurality of ice making chambers 12. It is configured.
- a cooling pipe 48 as the evaporator is meanderingly disposed on the upper surface of the outer frame 14 in close contact therewith.
- the ice making chamber 10 is manufactured by assembling components such as the outer frame 14, the partition member 30, and the cooling pipe 48 that are molded into a required shape.
- the ice making chamber 10 accommodates the partition member 30 in which a plurality of metal plates are assembled in a lattice shape in the outer frame 14 formed into a box shape by bending a metal plate, and the upper surface of the outer frame 14. It is assembled by arranging the cooling pipe 48 in a meander shape by bending a long hollow pipe.
- the outer frame 14 and the partition member 30 are joined by means such as caulking and brazing, and the outer frame 14 and the cooling pipe 48 are joined by brazing.
- a protrusion 31 is provided on the upper part of the partition member 30, and a caulking hole 16a is formed on the upper surface of the outer frame, and the upper surface of the outer frame 14 is inserted through the caulking hole 16a.
- each partition plate 30a, 30b constituting the partition member 30 is provided at the side end of each partition plate 30a, 30b constituting the partition member 30, and the locking piece is engaged with the locking piece at a position corresponding to the locking piece in the outer frame 14.
- a mating groove may be provided to position both members 14 and 30.
- the components of the ice making chamber 10 such as the outer frame 14, the partition member 30, and the cooling pipe 48 are made of a metal material such as copper having a good thermal conductivity as the substrate 17 (see FIG. 2). Heat exchange with the circulating refrigerant can be performed satisfactorily. Since the substrate 17 made of copper or the like is excellent in thermal conductivity but easily rusted, a molten tin plating film 11 is formed on the surface of the ice making chamber 10 as a rust preventive treatment as shown in an enlarged view in FIG. It is common. The molten tin plating film 11 is formed by immersing the entire ice making chamber 10 in which the constituent members 14, 30, and 48 are assembled in a tin bath containing molten tin as a main component.
- Patent Document 1 discloses an automatic ice making machine including an ice making chamber having a surface on which a molten tin plating film is applied.
- the galvanized tin coating film is less likely to rust than a base made of copper or the like, but when an oxidizing substance or the like is included in the use atmosphere, corrosion products such as rust may be formed over time. Since this corrosion product is easily peeled off from the molten tin plating film, there are problems such as the corrosion product being mixed into ice blocks. In addition, since the molten tin plating film has low resistance to sterilizing agents such as sodium hypochlorite and electrolytic acid water, it is not suitable for sterilizing the ice making chamber in which the film is formed with these chemicals.
- the present invention has been proposed in order to solve these problems inherently in the automatic ice making machine according to the prior art, and provides an automatic ice making machine that improves the corrosion resistance of the ice making part.
- the purpose is to do.
- the ice making chamber 10 includes an outer frame 14 including a rectangular top plate 16 and a side plate 18 that surrounds the four sides of the top plate 16.
- Partitioning member 30 that defines the ice making chamber 12 in a lattice shape.
- the outer frame 14 and the partition member 30 are assembled by inserting the protrusions 31 projecting from the necessary portions of the partition member 30 into the caulking holes 16a formed correspondingly to the top plate 16. Then, it is performed by caulking and fixing the head of the protrusion 31. However, the caulking is performed only by the plurality of protrusions 31 inserted into the caulking holes 16a.
- the caulking hole 16a drilled in the top plate 16 and the fitting portion between the projection 31 of the partition member 30 are joined by soldering or brazing.
- the outer frame 14 and the partition member 30 are made of copper, which is a good heat conductor, as a general material, there is a drawback that the copper is softened and deformed when exposed to high temperatures during the brazing. .
- a low melting point brazing material it is conceivable to use a low melting point brazing material, but this brazing material is more expensive and costly than a brazing material that is generally used.
- a surface treatment of molten tin plating is generally adopted from the viewpoint of food hygiene.
- the coating 11 formed by hot dip tin plating is relatively hard to rust.
- the atmosphere used in the ice making machine contains a substance that promotes corrosion, such as an oxidizing substance, the outer frame 14 and the partition member over time. 30 may cause corrosion products due to rust and the like.
- Such a corrosion product is easily peeled off from the molten tin plating film 11, and if this product is mixed into ice-making water or the ice block after production, there is a possibility that it becomes a problem in food hygiene management.
- Another invention in the present application is a so-called closed cell type injection type ice making machine that supplies ice making water to each ice making chamber in a state where the ice making chamber is closed with a water dish from below.
- An object of the present invention is to improve the corrosion resistance by applying an electroless nickel-phosphorous plating film to the outer frame and the partitioning member, as compared with the conventional surface treatment by hot-dip tin plating.
- an invention according to claim 1 is an automatic ice maker that circulates and supplies ice-making water to an ice-making room cooled by an evaporator to generate ice of a required shape.
- the gist is that an electroless nickel-phosphorous plating film containing 10% to 15% of a phosphorus component is formed on the outermost layer of the ice making chamber to a thickness of 15 ⁇ m or more.
- the corrosion resistance of the ice making chamber can be improved by the electroless nickel-phosphorous plating film formed on the outermost layer of the ice making chamber. For this reason, even if it is the use atmosphere where corrosion progresses in the conventional ice-making room, since generation
- the gist of the invention according to claim 2 is that the electroless nickel-phosphorus plating film is directly formed on the outer surface of the base of the ice making chamber. According to the invention of claim 2, the electroless nickel-phosphorous plating film formed on the outermost layer of the ice making chamber improves the corrosion resistance of the ice making chamber. There is no need to apply a multi-layer coating, and the production efficiency can be increased.
- the invention according to claim 3 provides a partition member formed by assembling a plurality of lateral partition plates and longitudinal partition plates in a lattice shape, and a top plate.
- An ice making chamber that is arranged in an outer frame made of side plates and defines a plurality of ice making chambers that open downward, and a refrigerant that is arranged on the top plate of the outer frame and circulates a refrigerant supplied from a refrigeration system.
- An evaporator for cooling the ice making chamber and a water tray for closing the ice making chamber so that the ice making chamber can be opened and closed from below and supplying ice-making water correspondingly to the plurality of ice making chambers, the partition member and the outer frame
- the gist is that an electroless nickel-phosphorous plating film is applied to the ice making chamber. According to the invention which concerns on Claim 3, even if the oxidizing substance which accelerates
- the part where the partition member is joined to the top plate of the outer frame is formed by a straight line, and the joining of the partition member and the top plate is brazed by soft brazing or hard brazing.
- the gist of this is as follows. According to the invention which concerns on Claim 4, since it is not necessary to give the crimping
- the gist of the invention according to claim 5 is that the joining of the partition member and the top plate by the hard solder is achieved by brazing in a furnace in a heating furnace.
- the partition member and the top plate of an outer frame can achieve whole heating by heating in a furnace, and the thermal distortion by local heating does not arise. For this reason, the distortion correction work as a post-process becomes unnecessary.
- the corrosion resistance of the ice making chamber is improved, so that corrosion products such as rust are not mixed into ice making water and ice, and the reliability of food hygiene can be improved. Further, according to the closed cell type jet ice making machine according to another invention of the present application, the corrosion resistance of the ice making chamber subjected to the surface treatment can be remarkably improved. There is no risk of corrosion products such as rust entering water or ice blocks.
- (c) is also an enlarged view of a portion in which the corner portion is surrounded by A, and a part of the second side plate is broken to expose the extending portion.
- molding the outer frame shown in FIG. 3 Comprising: (a) shows the state before bending a side plate with respect to a top plate, (b) bent the side plate with respect to the top plate. Indicates the state. It is an expansion perspective view of the corner part of the outer frame which concerns on another example. It is explanatory drawing of the process of shape
- (a) is an expansion perspective view of the corner part of the outer frame which concerns on another example, Comprising: (b) shows the state before pressing an extension part. It is explanatory drawing of the process of shape
- FIG. 9 is a perspective view of another example of the ice making chamber shown in FIG.
- FIG. 12 showing a state in which the evaporator is disassembled into an outer frame having an evaporator disposed above and a grid-like partition member. It is a perspective view which shows the partition member shown in FIG. 13 in the state decomposed
- an ice making chamber used in a so-called closed cell type spray type automatic ice making machine will be described as an ice making unit.
- an ice making chamber of a so-called open cell type automatic ice making machine that supplies ice making water without going through a water tray, an ice making plate of a flow down type automatic ice making machine that flows ice making water down to the ice making surface, etc. It may be.
- the ice making chamber described in the embodiment has the same basic configuration as the conventional ice making chamber described in FIG. 12, and therefore, the same reference numerals are used for the members already described.
- the automatic ice making machine circulates and supplies ice making water to the ice making chamber 10 cooled by the cooling pipe 48 as an evaporator, like the conventional ice making chamber 10 described in FIG. Generate.
- the ice making chamber 10 is basically composed of a box-shaped outer frame 14 that opens downward, and a lattice-shaped partition member 30 that is disposed inside the outer frame 14 and defines a plurality of ice making chambers 12.
- the cooling pipe 48 is closely arranged in a meandering manner on the upper surface of the outer frame 14.
- the box-shaped outer frame 14, the lattice-shaped partition member 30, and the cooling pipe 48 constituting the ice making chamber 10 are made of metal or alloy having excellent thermal conductivity such as copper.
- the electroless nickel-phosphorous plating film 23 is formed on the outermost layer of the substrate 17.
- the outermost layer of the ice making chamber 10 is a layer formed on a surface exposed to the outside in the ice making chamber 10. There may be a region where the electroless nickel-phosphorous plating film 23 is not formed on a part of the exposed surface of the ice making chamber 10.
- the electroless nickel-phosphorous plating film 23 may be provided in contact with the outer surface of the substrate 17, and as shown in FIG.
- an underlayer 25 made of a plating film such as nickel or palladium may be provided below the coating 23.
- an adjustment layer 33 made of a plating film such as copper may be provided on the surface of the substrate 17 in order to prepare the surface of the substrate 17. If the substrate 17 contains an element such as tin or lead that inhibits the precipitation of nickel in the electroless nickel-phosphorous plating process described later, the base layer 25 is applied to the surface of the substrate 17. Is preferred. That is, the base layer 25 and the adjustment layer 33 are appropriately implemented according to the surface state of the substrate 17 and the surface state of the base on which the electroless nickel-phosphorous plating film 23 is applied.
- the base layer 25 and the adjustment layer 33 that are not exposed to the outer surface of the ice making chamber 10 may have a thickness of about 1 ⁇ m.
- the electroless nickel-phosphorous plating film 23 formed on the outermost layer of the ice making chamber 10 is a so-called high phosphorus type containing 10% to 15% (mass percent concentration, hereinafter the same) phosphorus component. Further, as shown in FIGS. 1A to 1C, the electroless nickel-phosphorus plating film 23 is formed so that its film thickness t is 15 ⁇ m or more. In addition, by setting the film thickness t of the electroless nickel-phosphorous plating film 23 to 15 ⁇ m or more, it is possible to suppress the generation of pinholes reaching the substrate 17 or the base layer 25 or the adjustment layer 33. It has been confirmed by a confirmation test.
- the electroless nickel-phosphorous plating process for forming the electroless nickel-phosphorous plating film 23 will be described.
- the ice making chamber 10 is placed in a storage tank of a nickel-phosphorous plating solution mainly composed of a metal salt containing nickel such as nickel sulfate and a reducing agent such as sodium hypophosphite. It is carried out by so-called soaking.
- the nickel-phosphorous plating solution is adjusted so that the concentration of the phosphorous component in the formed electroless nickel-phosphorous plating film 23 is 10% to 15%.
- a required catalyst may be added to the nickel-phosphorous plating solution.
- the electroless nickel-phosphorous plating treatment is performed after the surface treatment. Do. In the outermost layer of the ice making chamber 10 immersed in the storage tank, the nickel cation derived from the metal salt is reduced and deposited, thereby forming the electroless nickel-phosphorous plating film 23 made of a nickel alloy. . As described above, the electroless nickel-phosphorous plating process is performed until the film thickness t of the electroless nickel-phosphorous plating film 23 becomes 15 ⁇ m or more. The electroless nickel-phosphorous plating process is performed individually on the constituent members such as the outer frame 14, the partition member 30, and the cooling pipe 48, and the constituent members 14, 30, 48 after the plating process are assembled. You may do it.
- the electroless nickel-phosphorous plating film 23 formed on the outermost layer of the ice making chamber 10 is an alloy, it is not eroded at all by an organic solvent and is good for organic acids, salts and alkalis. It has the advantage that it shows corrosion resistance and is very resistant to rust. Furthermore, since the electroless nickel-phosphorous plating film 23 has a thickness t of 15 ⁇ m or more, the occurrence of pinholes reaching the substrate 17 or the base layer 25 or the adjustment layer 33 can be suppressed, and the above-described good Can exhibit sufficient corrosion resistance.
- the plating film applied to the outermost layer of the ice making chamber 10 generally has a film thickness of 10 ⁇ m or less. This is due to the reason that it takes time to form the coating, and the reason that the thermal conductivity is lowered and the plating coating is easily peeled off by increasing the film thickness.
- the ice making chamber 10 according to the embodiment has excellent corrosion resistance as described above, even in an environment where corrosion proceeds in the conventional ice making chamber 10 described with reference to FIG. It can be performed.
- the electroless nickel-phosphorous plating film 23 exhibits excellent corrosion resistance as described above, and therefore is not easily corroded by a disinfectant such as sodium hypochlorite or electrolytic acid water. For this reason, maintenance such as sterilization treatment using the sterilizing agent can be performed, and the ice making chamber 10 can be kept more hygienic.
- the ice making chamber 10 is enhanced in corrosion resistance by the electroless nickel-phosphorous plating film 23, the film applied to the lower layer of the electroless nickel-phosphorous plating film 23 for the purpose of preventing the corrosion of the substrate 17.
- Example 1 A corrosion resistance confirmation test was performed on the ice making chamber 10 of the example to confirm the corrosion resistance. Further, as shown in Table 1, Comparative Example 1 in which the concentration of the phosphorus component was 8%, Comparative Example 2 and Comparative Example 3 in which the film thickness t of the electroless nickel-phosphorous plating film 23 was less than 15 ⁇ m, Corrosion resistance confirmation tests were also performed on Comparative Example 4 and Comparative Example 5 in which the hot-tin plating film 11 was applied instead of the electrolytic nickel-phosphorous plating film 23. In Experimental Examples 1 to 6 and Comparative Examples 1 to 3, a test was performed on a test piece provided with the electroless nickel-phosphorous plating film 23.
- Comparative Example 4 and Comparative Example 5 the test was performed on the test piece provided with the molten tin plating film 11 as in the conventional ice making chamber 10 described with reference to FIG.
- the conditions of each experimental example and comparative example are as shown in Table 1.
- Test Example 1, Experimental Example 2, Comparative Example 1, Comparative Example 2 and Comparative Example 3 are performed with test A described later, and Experimental Example 3, Experimental Example 4 and Comparative Example 4 are described with test described later.
- B was performed, and Test C, which will be described later, was performed on Experimental Example 5, Experimental Example 6, and Comparative Example 5.
- test A a 5% sodium chloride (NaCl) aqueous solution and a 0.5% hydrogen chloride (HCl) aqueous solution are mixed to prepare a test solution, and the test solution is sprayed on a 35 ° C. test tank and the test solution is sprayed. The specimen is exposed to the test solution for 168 hours.
- test B the test piece was immersed in a 10 ppm sodium hypochlorite (NaClO) aqueous solution for 1500 hours.
- test C the test piece was exposed to a hydrogen sulfide gas atmosphere of 5 ppm for 1500 hours.
- the corrosion resistance confirmation test whether or not corrosion occurred on the test piece was mainly confirmed visually. The results are shown in Table 1. In the test results shown in Table 1, when the occurrence of corrosion was confirmed, it was evaluated as “x”, and when the occurrence of corrosion was not confirmed, it was evaluated as “ ⁇ ”.
- Test A corrosion was observed in Comparative Example 2 and Comparative Example 3 in which the film thickness t of the electroless nickel-phosphorous plating film 23 was 10.4 ⁇ m and 10.8 ⁇ m.
- the film thickness t of the electroless nickel-phosphorous plating film 23 was 27.0 and 27.1. This is because the substrate 17 exposed through the pinhole of the coating 23 was oxidized in the comparative example 1 and the comparative example 2 in which the film thickness t of the coating 23 was thin compared to the experimental example 1 and the experimental example 2.
- Experimental Example 1 and Experimental Example 2 in which the film 23 is thickened it is considered that there is no pinhole reaching the substrate 17.
- Comparative Example 1 in which the content of phosphorus component in the electroless nickel-phosphorous plating film 23 was 8% (so-called medium phosphorus type), the film thickness t was 15 ⁇ m or more, but corrosion was confirmed in the film 23. On the other hand, no corrosion was confirmed in Experimental Examples 1 to 6 in which the content of the phosphorus component in the electroless nickel-phosphorous plating film 23 was 10% to 15% (so-called high phosphorus type). Therefore, it can be confirmed that sufficient corrosion resistance can be exhibited by setting the content of the phosphorus component in the electroless nickel-phosphorous plating film 23 to 10% to 15%.
- Comparative Example 4 and Comparative Example 5 in which the thickness of the molten tin plating film 11 was 21.8 ⁇ m and 21.3 ⁇ m, corrosion was confirmed on the film 11. On the other hand, no corrosion was confirmed on the coating 23 in Experimental Examples 3 and 5 in which the film thickness t of the electroless nickel-phosphorous plating film 23 was 15.2 ⁇ m and 15.1 ⁇ m, respectively. From this, it can be confirmed that the electroless nickel-phosphorous plating film 23 exhibits higher corrosion resistance than the hot-tin plating film 11.
- the present invention is not limited to the embodiment described with reference to FIG. 1, and can be modified as follows, for example.
- the layer structure between the substrate and the electroless nickel-phosphorous plating film is not limited to the example. That is, an underlayer or an adjustment layer different from that in the embodiment may be provided, or another layer may be provided.
- the ice making section includes not only ice making rooms used for jet type automatic ice making machines, ice making plates used for flow-down type automatic ice making machines, but also, for example, auger type automatic ice making machines, with cooling pipes on the outer peripheral surface. It may be a refrigerated casing or the like that is wound and generates ice on the inner peripheral surface.
- the configuration of the ice making chamber as the ice making unit is not limited to the embodiment.
- a type in which a frame body in which an ice making chamber is formed is provided on the lower surface of an ice making substrate on which cooling pipes are meandered may be used.
- the automatic ice making machine is not limited to an independent type as in the embodiment, but may be one built in a refrigerator or a freezer. That is, the automatic ice making machine according to the present invention may be provided in an ice making space defined in a freezer compartment of a home refrigerator, and in this case, the ice making part is disposed in the ice making space, An ice tray or the like that is cooled by an evaporator connected to a refrigeration system to produce ice may be used.
- the electroless nickel-phosphorous plating film may be formed at least in the range where ice is generated in the outermost layer of the ice making part.
- the jet type ice maker according to another invention is a closed cell type ice maker described with reference to FIG.
- the configuration of the ice making chamber 10 to which this another invention is applied is also as described with reference to FIG.
- the partition member 30 is a combination of a plurality of horizontal partition plates 30a and a vertical partition plate 30b, and partitions the interior into a lattice shape to thereby partition the plurality of ice making chambers 12. Is defined.
- the slits 60 are formed at predetermined intervals on the lower edge of the horizontal partition plate 30a, and the slits 62 are formed at predetermined intervals on the upper edge of the vertical partition plate 30b. Is inserted into the slit 62 of the corresponding vertical partition plate 30b, whereby the lattice-shaped partition member 30 shown in FIG. 13 is obtained.
- the portion of the outer frame 14 that will be described later is in contact with the back surface of the top plate 16, and is configured with a straight line.
- the protrusion 31 is not provided.
- the outer frame 14 and the grid-like partition member 30 are preferably made of copper having good thermal conductivity.
- the outer frame 14, the partition member 30 composed of vertical and horizontal partition plates 30a and 30b, the evaporator 48, and other parts such as a bracket (not shown) for attaching a temperature sensor are degreased and cleaned before assembling them. Go and remove the fat component completely.
- the ice making chamber 10 is obtained by arranging the grid-like partition members 30 inside the box-shaped outer frame 14 and joining them together.
- the outer frame 14 and the partition member 30 are joined by so-called brazing.
- brazing 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.
- solddering and “brazing” are academically a type of welding, and the case where a bonding agent (soft solder) with a melting point of 450 ° C. or lower is used is called “soldering”, and the melting point is 450 ° C.
- the “solder” and “brazing material” include sheet-like, foil-like, linear and other paste-like forms in addition to rod-like ones, an appropriate one is selected for use.
- the box-shaped outer frame 14 is covered from above.
- the rod-shaped brazing material is interposed closely between the back surface of the top plate 16 in the outer frame 14 and the vertical partition plate 30b.
- the ice making chamber 10 composed of the outer frame 14 and the partition member 30 is placed in a heating furnace heated to a predetermined temperature range, and brazing in the furnace for a predetermined time is performed.
- the furnace is heated in the furnace in this manner, each member is heated as a whole, so that thermal distortion does not occur. Therefore, the correction work for removing the thermal distortion is not required.
- a paste-like brazing material may be used, and the partition member 30 may be disposed after this is applied to the back surface of the top plate 16.
- a paste-like brazing material may be applied to the entire back surface of the top plate 16, but the amount of use can be reduced by applying only to the portion where the vertical and horizontal partition plates 30a, 30b abut on the partition member 30. May be saved.
- the evaporator 48 is placed on the top plate 16 or a part requiring brazing joining such as a bracket for attaching a temperature sensor is attached, and heating is performed simultaneously. You may braze and join by a furnace.
- brazing copper when copper is selected as the material of the outer frame 14 and the partition member 30, since the inside of the furnace is exposed to a high temperature in brazing using the hard braze, the copper is annealed and the hardness is lowered. There is. For this reason, when brazing copper, it is preferable to carry out at the lowest possible brazing temperature.
- a brazing material whose melting point is lowered by a quaternary eutectic (eutectic mixture) of copper, phosphorus and silver or a quaternary eutectic of copper, nickel, phosphorus and tin is used.
- the maximum temperature of the brazing temperature is lowered and the high temperature exposure time in the furnace is shortened, so that it is possible to minimize the softening of copper, which is the material of the outer frame 14 and the partition member 30. is there.
- the material of the outer frame 14 and the partition member 30 a copper alloy having heat resistance and not impairing the characteristics as a good thermal conductor is used, and the entire contact area of both the members 14 and 30 is brazed. You may join.
- the copper alloy having heat resistance is a characteristic in which a certain element is added to the component, and the element is precipitated when heated in a furnace at a high temperature to prevent softening of the copper alloy. It has what has.
- a residue of flux generated at the time of brazing adheres to the surface.
- the surface of the ice making chamber 10 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.
- the cleaning step can be omitted if a reducing furnace that keeps the inside of the furnace in a reducing atmosphere is used as the heating furnace.
- the reduction furnace uses hydrogen gas or modified gas as the atmosphere in the furnace, so that the brazing can be performed without using a flux, and thus no flux residue is produced.
- an electroless nickel-phosphorus plating film 23 is applied to the surface of the ice making chamber 10 (all the inner and outer surfaces of the outer frame 14 and the partition member 30) after the surface cleaning process. .
- the electroless nickel-phosphorous plating film 23 is applied to the outermost layer of the ice making chamber 10.
- the phosphorus concentration is 10% or more (high phosphorus type)
- the film thickness t is 15 ⁇ m or more.
- the electroless nickel-phosphorous plating film 23 is for enhancing the corrosion resistance of the ice making chamber 10, and as a result of a corrosion resistance confirmation test, it is found that the thickness is 15 ⁇ m or more.
- the film 23 is smaller than 15 ⁇ m, pinholes reaching the substrate 17 may be formed, and even if the electroless nickel-phosphorous plating film 23 is applied, high corrosion resistance cannot be obtained.
- 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 treatment of the electroless nickel-phosphorous plating film 23 is performed by so-called soaking in which the ice making chamber 10 is completely immersed in a nickel-phosphorous plating solution storage tank.
- a base treatment of the electroless nickel-phosphorous plating film 23 which is the outermost layer the surface of the base 17 of the ice making chamber 10 is plated with nickel, palladium, etc., and then the electroless nickel- It is good also as a two-layer process which gives the phosphorus plating film 23.
- a three-layer process may be performed in which the surface of the ice making chamber 10 is subjected to copper plating, then nickel plating, and then the electroless nickel-phosphorous plating film 23 is formed on the nickel plating.
- the ice making chamber 10 as in the second or third layer. It is highly necessary to apply nickel plating or copper plating to the substrate 17.
- the ice making chamber 10 shown in FIG. 13 includes a partition member 30 in which vertical and horizontal partition plates 30a and 30b are combined in a lattice pattern inside an outer frame 14 constituted by a rectangular top plate 16 and four side plates 18. Is housed.
- a partition member 30 in which vertical and horizontal partition plates 30a and 30b are combined in a lattice pattern inside an outer frame 14 constituted by a rectangular top plate 16 and four side plates 18. Is housed.
- FIG. 2 and FIG. 8 of Japanese Patent Laid-Open No. 7-260301 there are some in which the vertical and horizontal partition plates located on the outermost side of the grid-like partition function as the side plates of the ice making chamber.
- a rectangular box-shaped ice making chamber is configured simply by covering the grid-like partition plate with a top plate.
- the grid-like partition member 30 and the side plate 18 of the outer frame 14 may be separated, and the vertical and horizontal partition plates 30 a and 30 b positioned on the outermost side of the grid-like partition member 30. It may be handled as the side plate 18 of the outer frame 14. Further, the outer frame 14 of the ice making chamber 10 may be formed by integrally forming the top plate 16 and the side plate 18, or may be configured by separately forming the top plate 16 and the side plate 18.
- the following advantageous effects can be obtained.
- -By applying the surface treatment of the ice making chamber with specifications that allow the actual amount of electroless nickel-phosphorous plating to be fully demonstrated it can be operated without being corroded even in an environment where conventional tin plating corrodes.
- ⁇ Maintenance using chemicals such as disinfectants (sodium hypochlorite, electrolytic acid water, etc.) that were difficult to use due to corrosion and deterioration caused by conventional tin plating is possible.
- -Even if it is not a skilled worker, it becomes possible to mass-produce the ice-making room of the stable quality by observing the setting value in a joining agent supply apparatus, a heating furnace, etc.
- the melting temperature is extremely lower than that of the brazing material (for example, the brazing temperature of phosphor copper brazing is 650 to 900 ° C, and the solder is 200 to 300 ° C). It will be advantageous.
- the strength of the joint is increased because the material strength is higher than that of soldering.
- the ice making chamber has anisotropy in strength due to the effect of combining the partition plates, but the anisotropy disappears because all the brazing materials are joined.
- post-cleaning is unnecessary by using a reduction furnace and making it flux-free, so that cleaning water, chemicals and other labor can be greatly reduced, and cost can be reduced.
- brazing there is no need to worry about surface treatment defects (plating repellency, poor adhesion) due to flux residue remaining after cleaning when joining without flux, and quality is stabilized.
- surface treatment defects plating repellency, poor adhesion
- the strength of the ice making chamber is maintained even when a brazing material having a high brazing temperature and an inexpensive brazing material is used because there is no reduction in the strength of the material even when brazing at a high temperature. The cost can be reduced by using an inexpensive brazing material.
- FIG. 9A is an exploded perspective view of the ice making chamber 10 basically described in FIGS. 12 and 13.
- the outer frame 14 includes a rectangular top plate 16 on which the cooling pipe 48 is disposed, and a rectangular side plate 18 extending downward from each side 16b of the top plate 16, and has a thermal conductivity. It is formed by bending a good metal plate such as copper. That is, as shown in FIG.
- the outer frame 14 has a side plate 18 extending integrally from the four sides 16b of the top plate 16 along each side 16b of the top plate 16. It is manufactured as a rectangular box that is bent downward in the same direction indicated by the arrow f in FIG. Therefore, as shown in an enlarged view in FIG. 9B, each side end portion of the two side plates 18 and 18 adjacent to each other by the bending forms a corner portion 20 of the outer frame 14.
- the lattice-shaped partition member 30 shown in FIG. 9A is accommodated inside the outer frame 14 bent in this way from the opening 14a side of the outer frame 14, and both members 14 are secured by means such as caulking and brazing. , 30 are joined. When the caulking is fixed, as shown in FIG.
- a protrusion 31 is provided on the upper part of the partition member 30, and a caulking hole 16a is formed in the top plate 16, and the caulking hole 16a is inserted into the ceiling. This is done by crushing the protrusion 31 protruding from the upper surface of the plate 16 with a hammer or the like.
- the corner portion 20 of the outer frame 14 described with reference to FIG. 12 the side end portions of the two side plates 18 and 18 are adjacent to each other by the bending as shown in FIG. 9B. And this corner part 20 is joined to the both ends by spot welding using a brazing material such as phosphor copper brazing.
- a brazing material such as phosphor copper brazing.
- this welding work is performed manually, the spot welding performed by abutting the end faces of the side plates 18 and 18 requires skill, and it is generally difficult to ensure a certain quality.
- the corner portion 20 is insufficiently welded, a strong stress is applied to the side plate 18 due to expansion when ice grows in the ice making chamber 12, and the side plates 18 in the corner portion 20 are disconnected from each other.
- the outer frame opening 14a may open.
- the ice making chamber 10 is proposed as follows, which structurally suppresses the corner portion 20 of the outer frame 14 from coming off and has a stable quality.
- the ice making chamber 10 is a rectangular side plate that integrally extends from the four sides 16 b of the rectangular top plate 16, similarly to the ice making chamber 10 described in FIGS. 9 and 10. 18 is disposed inside the outer frame 14 and a box-shaped outer frame 14 that is bent downward (in the same direction) along the sides 16b of the top plate 16 and opened downward (one side).
- the cooling pipe 48 constituting the refrigeration system 46 is closely and meanderingly disposed on the upper surface of the outer frame 14.
- the partition member 30 defines a plurality of ice making chambers 12.
- the outer frame 14 is a metal having a shape in which the outer frame 14 is cut out at a corner portion 20 where the side plates 18 are joined and developed on a plane as shown in FIG. A plate is formed, and each side plate 18 is formed by bending downward as indicated by an arrow a along each side 16b of the top plate 16 indicated by a two-dot chain line in FIG.
- the lattice-shaped partition member 30 is arranged inside the outer frame 14 that is bent and formed.
- the side plate 18 is opposed to two long side plates 18 and 18 (hereinafter sometimes referred to as the first side plate 18A) extending in parallel to face each other.
- the two side plates 18 and 18 (hereinafter sometimes referred to as second side plates 18B) extending in parallel with each other, and the side edges of the first side plate 18A and the second side plate 18B that are perpendicular to each other, A corner portion 20 of the outer frame 14 is formed.
- the dimensions of the first side plate 18A and the second side plate 18B are set in accordance with the size and amount of ice blocks produced in the ice making chamber 10, and the both side plates 18A and 18B may have the same dimensions.
- each partition plate 30a, 30b constituting the partition member 30 shown in FIG.
- An engagement groove that engages with the locking piece may be formed.
- the side plate 18 is bent with respect to the top plate 16 at the side end portions of the two side plates 18, 18 forming the corner portion 20 adjacent to each other in the outer frame 14.
- the fitting part 22 which fits mutually is provided. That is, the outer frame 14 is provided with the fitting portion 22 at each of the four corner portions 20 formed by the side end portion of the first side plate 18A and the side end portion of the second side plate 18B.
- the fitting portion 22 includes an extension portion 24 formed at a side end portion (end portion) of the first side plate 18A (one side plate) facing the corner portion 20, and a second side plate 18B facing the corner portion 20.
- a notch 26 is formed at a side end (end) of (the other side plate) and accepts the extension 24 in a contact state.
- a side end portion of the first side plate 18A has a first side end surface 19a of the first side plate 18A extending on the same plane as the inner surface 18Bb of the second side plate 18B.
- the extending portion 24 extending in the thickness direction of the second side plate 18B is formed.
- the extending portions 24 are provided at both lower corners of the first side plate 18A so as to extend on the same plane as the plate surface of the first side plate 18A with the same thickness as the first side plate 18A.
- the extension dimension L1 from the first side end face 19a in the extension part 24 is set to a dimension at least equal to the thickness dimension D2 of the second side plate 18B.
- the extension dimension L1 of the extension part 24 shown in FIGS. 3 and 4 is set to be equal to the thickness dimension D2 of the second side plate 18B, and as shown in FIG. The extended end surface 24b and the outer surface 18Ba of the second side plate 18B are aligned.
- the extension part 24 is designed to increase its strength by increasing its height dimension H1 (FIG. 4A).
- the second side plate 18B has a side end portion from a second side end surface 19b of the second side plate 18B extending on the same plane as the inner surface 18Ab of the first side plate 18A.
- a protruding portion 21 that protrudes in the thickness direction of the first side plate 18A is formed.
- the projecting portion 21 is provided at a position shifted upward from the lower end of the second side plate 18B so as to correspond to the extending portion 24 of the first side plate 18A.
- the cutout portion 26 is formed to open downward and laterally by 19b and receive the extended portion 24 in a contact state.
- the notches 26 are provided in correspondence with the extending portions 24 at both lower corners of the second side plate 18B.
- the protrusion dimension L2 of the protrusion 21 from the second side end surface 19b is set to be equal to the thickness dimension D1 of the first side plate 18A, and as shown in FIG.
- the end surface 21b and the outer surface of the extending portion 24 (the outer surface 18Aa of the first side plate 18A) fitted to the notch portion 26 are aligned.
- the vertical height (length) dimension H2 of the notch 26 in the second side plate 18B is the vertical direction of the extension 24 in the first side plate 18A.
- the height (length) dimension H1 is set to be slightly larger than the height dimension H1, and the extended portion 24 can be received in contact with the cutout portion 26 as will be described later.
- the fitting portion 22 is formed on the cutout portion 26 when the side plate 18 is bent from each side 16 b of the top plate 16 in the molding process of the outer frame 14. 24 is received in contact.
- the upper surface 24a of the extending portion 24 and the protruding portion 21 forming the notched portion 26 are provided.
- the lower surface 21a of the first side plate 18A and the second side surface 18a are in close contact with each other, and the inner surface of the extended portion 24 and the second side end surface 19b forming the notch 26 are in close contact with each other.
- the side plate 18B is structurally fixed.
- the fitting force of the fitting part 22 is such that the extension part 24 and the notch part 26 come into contact with each side plate 18 even if the expansion force of the ice mass growing in the ice making chamber 12 acts outwardly on each side plate 18. It is set so that the first side plate 18A and the second side plate 18B are not disconnected by the frictional force of the surface. If the height dimension H1 of the extension part 24 and the height dimension H2 of the notch part 26 are increased, the contact area (adhesion degree) between the extension part 24 and the notch part 26 increases. The bonding strength of 18B increases.
- the inner surface of the protruding portion 21 of the second side plate 18B and the first side end surface 19a of the first side plate 18A come into contact with each other.
- the inner surface of the extension portion 24 in the first side plate 18A and the second side end surface 19b of the second side plate 18B abut in the fitted state. That is, the first side plate 18A and the second side plate 18B come into contact with the side end surfaces 19a and 19b of the other side plate 18, so that deformation that falls inward with respect to the top plate 16 is regulated. ing.
- the first side plate 18A and the second side plate 18B are in a relationship of receiving each other.
- each side plate 18 rotates in the direction of the arrow a about each side 16b of the top plate 16 indicated by a two-dot chain line.
- the first side plate 18A and the second side plate 18B are folded to a predetermined position that is substantially perpendicular to the top plate 16 shown in FIG. It contacts the side plate 18. That is, the first side plate 18A and the second side plate 18B are adapted to receive forces in the bending operation direction.
- the ice making chamber 10 bends the side plate 18 with respect to the top plate 16 so that the extended portion of the first side plate 18A facing the same corner portion 20 is formed in the notch portion 26 of the second side plate 18B facing the corner portion 20.
- the first side plate 18A and the second side plate 18B are structurally fixed by receiving 24 and fitting together.
- the corner portions 20 of the first side plate 18A and the second side plate 18B are joined by brazing in the furnace. That is, it is not necessary for the operator to perform spot welding by hand, and the number of work steps can be reduced.
- the ice making chamber 10 has the extending portion 24 of the first side plate 18A in contact with the second side end surface 19b of the second side plate 18B, and the protruding portion 21 of the second side plate 18B is the first of the first side plate 18A. It contacts the side end face 19a. In this way, the first side plate 18A and the second side plate 18B abut against the other side plate 18 and receive each other, thereby structurally restricting deformation such that the side plate 18 tilts inward with respect to the top plate 16. Can do.
- the internal space of the outer frame 14 in which the partition member 30 is disposed becomes small, and the partition member 30 cannot enter or is disposed.
- partition member 30 is deformed.
- the shape of the ice block to be manufactured is distorted or an extra load is constantly applied to the outer frame 14. Since the outer frame 14 can keep a constant distance between the opposing side plates 18, 18, the partition member 30 can be disposed with an appropriate clearance.
- the outer frame 14 in which the side plates 18 are integrated with the top plate 16 at the upper end portion has a structure in which the lower side (open end side) of the corner portion 20 is easy to open.
- the extension portion 24 and the cutout portion 26 are provided in the lower corner portion of the side plate 18, so that the lower portion of the corner portion 20 is effectively prevented from opening by the fitting portion 22. Can do.
- the height dimension H1 of the extension part 24 and the height dimension H2 of the notch part 26 are increased, the strength of the extension part 24 itself to which a force is easily applied increases, and the extension part 24 and the notch part 26 are increased.
- the bonding strength between the side end portion of the first side plate 18A and the side end portion of the second side plate 18B is increased. That is, by increasing the ratio of the height dimension of the fitting portion 22 to the height dimension of the outer frame 14, the structural joint strength of the corner portion 20 of the outer frame 14 is increased, and the outer frame opening 14a Opening can be effectively suppressed.
- the ice making chamber 10 shown in FIG. 4 is configured such that the extended end surface 24b of the extended portion 24 provided at the side end portion of the first side plate 18A and the outer surface 18Ba of the second side plate 18B are aligned.
- the extending portion 24 extends larger than the thickness dimension D ⁇ b> 2 of the second side plate 18 ⁇ / b> B (the other side plate) and the top plate 16. After the side plate 18 is bent, the extended portion 24 is bent and brought into contact with the second side plate 18B.
- the same members as those shown in FIGS. 3 and 4 are denoted by the same reference numerals.
- the extending portion 24 extends along the plate surface of the first side plate 18 ⁇ / b> A and is fitted with the notch portion 26, and the extending end portion 27 is the second end plate 27. It is bent along the plate surface of the side plate 18B. That is, the extension end portion 27 of the extension portion 24 shown in FIG. 5 is perpendicular to the second side plate 18B side with respect to the plate surface of the first side plate 18A so that the inner surface abuts on the outer surface 18Ba of the second side plate 18B. A bent portion 27 is formed.
- the extension 24 extends from the first side end face 19a in the extension 24 in a state before the side plate 18 is bent with respect to the top plate 16.
- the extending end portion 27 of the extending portion 24 is extended on the same plane as the plate surface of the first side plate 18A so that the dimension L1 is larger than the thickness dimension D2 of the second side plate 18B.
- the outer frame 14 is similar to the outer frame 14 shown in FIGS. 3 and 4 when the side plate 18 is bent from each side 16b of the top plate 16.
- the extending portion 24 formed at the side end portion of the first side plate 18A is received in contact with the cutout portion 26 formed at the side end portion of the second side plate 18B.
- the extended portion 24 extends outward from the outer surface 18Ba of the second side plate 18B.
- the extension end portion 27 of the extension portion 24 is indicated by an arrow c in FIG. 6B by a corner molding machine or the like so that the inner surface of the extension end portion 27 approaches the outer surface 18Ba of the second side plate 18B.
- the bent portion 27 extending along the outer surface 18Ba of the second side plate 18B is formed as shown by a two-dot chain line in FIG.
- the extending portion 24 is bent in a hook shape so as to follow the outer surface 18Ba of the second side plate 18B, and therefore the fitting between the extending portion 24 and the notch portion 26 is further performed.
- the extending portion 24 provided on the first side plate 18A is bent along the outer surface 18Ba of the second side plate 18B.
- the extending portion 24 extends larger than the thickness dimension D ⁇ b> 2 of the second side plate 18 ⁇ / b> B (the other side plate), and with respect to the top plate 16. After the side plate 18 is bent, the extended portion 24 is pressed and brought into contact with the second side plate 18B.
- the same members as those in the configurations shown in FIGS. 3 and 4 and the configurations shown in FIGS. 5 and 6 are denoted by the same reference numerals.
- the extension 24 provided at the side end of the first side plate 18A extends outward from the outer surface 18Ba of the second side plate 18B, and the second It protrudes above the notch 26 of the side plate 18B.
- the extended end portion 28 of the extended portion 24 has a protrusion 29 protruding upward from the cutout portion 26 of the second side plate 18B (the portion that fits the cutout portion 26 in the extended portion 24).
- the protrusion 29 is pressed so as to contact an upper portion of the cutout portion 26 (mainly the outer surface of the protruding portion 21) on the outer surface 18Ba of the second side plate 18B.
- the extension portion L1 shown in FIG. 8A is an extension dimension L1 from the first side end surface 19a, and the thickness dimension of the second side plate 18B.
- the extension end portion 28 of the extension portion 24 is on the same plane as the plate surface of the first side plate 18A so as to have an inclined surface 29a that becomes larger than D2 and has an oblique angle that increases in the extension direction.
- the extended end portion 28 of the extended portion 24 is formed with a triangular protrusion 29 that protrudes upward from a portion of the extended portion 24 that is received by the notch 26 and has the inclined surface 29a. Has been.
- the outer frame 14 shown in FIG. 8 (b) has the extending portion 24 formed at the side end portion of the first side plate 18A.
- the cutout portion 26 formed at the side end of the second side plate 18B is received in a contact state.
- the extending end portion 28 of the extending portion 24 extends outward from the outer surface 18Ba of the second side plate 18B, and
- the protrusion 29 extends to above the notch 26.
- the inclined surface 29a of the protrusion 29 and the outer surface 18Ba of the second side plate 18B face each other, and the interval between the inclined surface 29a and the outer surface 18Ba of the second side plate 18B is It expands as you go upward.
- the extension end portion 28 of the extension portion 24 is pressed by a corner molding machine or the like so as to be pressed against the outer surface 18Ba of the second side plate 18B as shown by an arrow e in FIG.
- the inclined surface 29a is crushed so as to contact the outer surface 18Ba of the second side plate 18B.
- the range in which the first side plate 18 ⁇ / b> A and the second side plate 18 ⁇ / b> B are in close contact with each other is extended in the height direction by the pressed protrusion 29.
- the extension end portion 28 of the extension portion 24 includes a protrusion 29 that protrudes upward and is pressed to come into contact with the outer surface 18Ba of the second side plate 18B.
- the fitting between the protruding portion 24 and the cutout portion 26 becomes stronger. That is, since the range in which the first side plate 18A and the second side plate 18B are in close contact with each other is extended in the height direction by the protrusion 29, the structural bonding strength of the corner portion 20 of the outer frame 14 is increased. It can suppress effectively that the 14 corner parts 20 open.
- the inclined surface 29a of the protrusion 29 has an oblique angle that increases in the extending direction of the extending portion 24, the first side plate 18A is bent with respect to the top plate 16.
- the protrusion 29 does not interfere with the second side plate 18B. In this way, it is possible to increase the bonding strength of the corner portion 20 of the outer frame 14 in an operation that does not require skill, such as extending the extending portion 24 and pressing the extended extending end portion 28 with a corner molding machine or the like. Since the quality can be increased, the quality can be stabilized and the manufacturing cost can be reduced.
- the ice making chamber described with reference to FIGS. 3 to 8 is not limited to the configuration described above, and can be modified as follows, for example.
- the extension part was formed in the edge part of one side plate, the extension dimension of this extension part may be smaller or larger than the thickness dimension of the other side plate. That is, it is only necessary that at least a part of the extension part is received by at least a part of the notch part.
- the fitting strength of the extension part and the notch part increases, it is preferable to make the extension dimension of the extension part larger than the thickness dimension of the other side plate from the viewpoint of bonding strength.
- the shape of the notch and the extending part received in the notch may be, for example, a triangle.
- the shape of the extended end portion bent so as to come into contact with the other side plate is not limited to a rectangular shape, for example, a triangle or the like Also good.
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Abstract
Description
請求項2に係る発明によれば、製氷室の最外層に形成された無電解ニッケル-リンめっき被膜により、該製氷室の耐腐蝕性が向上するので、素地の腐蝕を防ぐ目的で該素地に多層の被膜を施す必要がなく、製造効率を高めることができる。
請求項3に係る発明によれば、クローズドセルタイプの噴射式製氷機が稼働する現場の使用雰囲気に腐蝕を促進させる酸化性物質が存在していても、製氷室がサビたりして腐蝕生成物を生じさせる虞が低減される。
請求項4に係る発明によれば、仕切部材および外枠の天板にカシメ固定のための加工を施す必要がないため、製造工程数を減らすことができる。
請求項5に係る発明によれば、仕切部材と外枠の天板とを炉中加熱により全体加熱を達成することができ、局所的な加熱による熱歪みを生ずることがない。このため、後工程としての歪み修正作業も不要になる。
また本願の別の発明に係るクローズドセルタイプの噴射式製氷機によれば、表面処理を施した製氷室の耐腐蝕性を格段に向上させることができ、従って長期に亘り使用しても、製氷水や氷塊中にサビ等の腐蝕生成物が混入する虞がない。
実施例に係る自動製氷機は、図12で説明した従来の製氷室10と同様に、蒸発器としての冷却パイプ48により冷却される製氷室10に製氷水を循環供給して所要形状の氷を生成する。また、前記製氷室10は、下方に開放した箱状の外枠14と、該外枠14の内部に配設されて、複数の製氷小室12を画成する格子状の仕切部材30とから基本的に構成され、前記外枠14の上面に冷却パイプ48が密着的に蛇行配置されている。
前記製氷室10を構成する箱状の外枠14、格子状の仕切部材30および冷却パイプ48は、図1に示すように、銅等の熱伝導性に優れた金属や合金等を材質としており、その素地17の最外層に無電解ニッケル-リンめっき被膜23が形成されている。ここで、製氷室10の最外層とは、該製氷室10における外部に露出する面に形成された層である。なお、製氷室10の露出面の一部に前記無電解ニッケル-リンめっき被膜23を形成しない領域があってもよい。図1(a)に示すように、前記無電解ニッケル-リンめっき被膜23は、前記素地17の外表面に接触して設けられていてもよく、また、図1(b)に示すように、無電解ニッケル-リンめっき被膜23の下地として、該被膜23の下層にニッケルやパラジウム等のめっき被膜からなる下地層25を設けてもよい。更に、図1(c)に示すように、前記素地17の表面を整えるために、該素地17の表面に銅等のめっき被膜からなる調整層33を設けてもよい。なお前記素地17が、後述する無電解ニッケル-リンめっき処理でのニッケルの析出を阻害する錫や鉛などの元素を含んでいる場合には、該素地17の表面に前記下地層25を施すのが好ましい。すなわち、前記下地層25および調整層33は、前記素地17の表面状態や無電解ニッケル-リンめっき被膜23を施す下地の表面状態などに応じて適宜実施される。なお、前記製氷室10の外面に露出しない前記下地層25および調整層33の厚さは、1μm程度であってもよい。
前記製氷室10の最外層に形成された無電解ニッケル-リンめっき被膜23は、10%~15%(質量パーセント濃度、以下同様)のリン成分を含有している所謂高リンタイプである。また、図1(a)~(c)に示すように、前記無電解ニッケル-リンめっき被膜23は、その膜厚tが15μm以上の厚みとなるよう形成されている。なお、無電解ニッケル-リンめっき被膜23の膜厚tを15μm以上とすることで、前記素地17または前記下地層25や調整層33に達するピンホールの発生を抑えることが、後述する耐腐蝕性確認試験により確認されている。
ここで、前記無電解ニッケル-リンめっき被膜23を形成する無電解ニッケル-リンめっき処理について説明する。無電解ニッケル-リンめっき処理は、硫酸ニッケルなどのニッケルを含む金属塩と、次亜リン酸ナトリウムなどの還元剤とを主成分とするニッケル-リンめっき溶液の貯留槽へ、前記製氷室10をそっくり浸漬させる所謂どぶ漬けで行われる。前記ニッケル-リンめっき溶液は、形成される無電解ニッケル-リンめっき被膜23におけるリン成分の濃度が、10%~15%となるよう調整される。また、前記ニッケル-リンめっき溶液には、所要の触媒が添加されることもある。なお、前記素地17と無電解ニッケル-リンめっき被膜23との間に前記調整層33や前記下地層25を設ける場合には、これらの表面処理を施した後で無電解ニッケル-リンめっき処理を行う。前記貯留槽に浸漬された製氷室10の最外層には、前記金属塩由来のニッケル陽イオンが還元されて析出することで、ニッケル合金からなる前記無電解ニッケル-リンめっき被膜23が形成される。前述の如く、無電解ニッケル-リンめっき処理は、無電解ニッケル-リンめっき被膜23の膜厚tが15μm以上となるまで行う。なお、無電解ニッケル-リンめっき処理は、前記外枠14、仕切部材30および冷却パイプ48等の構成部材に対して個別に行い、該めっき処理後の各構成部材14,30,48を組付けるようにしてもよい。
次に、図1の実施例に係る自動製氷機の作用について説明する。前記製氷室10の最外層に形成された前記無電解ニッケル-リンめっき被膜23は、合金であるため大抵の有機溶剤には全く浸食されず、有機酸、塩類、アルカリ類に対しても良好な耐腐蝕性を示し、非常に錆びにくいといった利点がある。更に、前記無電解ニッケル-リンめっき被膜23は、その膜厚tを15μm以上としたことで、前記素地17または前記下地層25や調整層33に達するピンホールの発生が抑えられ、前述の良好な耐腐蝕性を充分に発揮し得る。また、前記無電解ニッケル-リンめっき被膜23の含有するリン成分の濃度を10%~15%としたことで、リン成分の濃度を10%以下とした場合に比べて耐腐蝕性に優れている。なお、耐腐蝕性については、後述する耐腐蝕性確認試験により確認されている。なお、前記製氷室10の最外層に施されるめっき被膜は、その膜厚を10μm以下とするのが一般的である。これは、被膜の形成には時間を要するという製造上の理由や、膜厚を大きくすることで熱伝導率が低下したりめっき被膜が剥がれ易くなったりする等の理由に由来する。
実施例の製氷室10に関して耐腐蝕性確認試験を行い、耐腐蝕性を確認した。また、表1に示すように、リン成分の含有濃度を8%とした比較例1、無電解ニッケル-リンめっき被膜23の膜厚tを15μmより薄くした比較例2および比較例3、前記無電解ニッケル-リンめっき被膜23に変えて溶融錫めっき被膜11を施した比較例4および比較例5についても、耐腐蝕性確認試験を行った。実験例1~6および比較例1~3では、無電解ニッケル-リンめっき被膜23を施した試験片に対して試験を行っている。但し、比較例1における無電解ニッケル-リンめっき被膜23のリン成分含有濃度、比較例2および比較例3における無電解ニッケル-リンめっき被膜23の膜厚tについては、実施例とは変えてある。また、比較例4および比較例5では、図12で説明した従来の製氷室10の如く溶融錫めっき被膜11を施した試験片に対して試験を行っている。なお、各実験例および比較例の諸条件は表1に記載の通りである。実験例1、実験例2、比較例1、比較例2および比較例3に対しては、後述する試験Aを行い、実験例3、実験例4および比較例4に対しては、後述する試験Bを行い、実験例5、実験例6および比較例5に対しては、後述する試験Cを行った。
本発明は、図1を参照して説明した実施例に限定されるものでなく、例えば以下のように変更することが可能である。
(1) 素地と無電解ニッケル-リンめっき被膜との間の層構成は、実施例に限定されない。すなわち、実施例とは異なる下地層や調整層が設けられていたり、別の層が設けられていてもよい。
(2) 製氷部としては、噴射式自動製氷機に用いられる製氷室、流下式自動製氷機に用いられる製氷板だけでなく、例えば、オーガ式自動製氷機に用いられ、外周面に冷却パイプが巻回されると共に内周面に氷が生成される冷凍ケーシング等であってもよい。また、製氷部としての製氷室の構成についても、実施例に限定されない。例えば、冷却パイプが蛇行配置された製氷基板の下面に、製氷小室が形成された枠体が設けられたタイプ等であってもよい。また、自動製氷機は、実施例の如く独立したタイプだけではなく、冷蔵庫や冷凍庫に内蔵されたものでもよい。すなわち、本発明に係る自動製氷機としては、家庭用冷蔵庫の冷凍室に画成された製氷用空間に設けたものでもよく、この場合の製氷部としては、前記製氷用空間に配設され、冷凍系に接続する蒸発器により冷却されて氷を作る製氷皿等であってもよい。
(3) 無電解ニッケル-リンめっき被膜は、少なくとも製氷部の最外層において少なくとも氷が生成される範囲に形成されていればよい。
従って前記製氷室10において、格子状の仕切部材30と外枠14の側板18とは別体としてよいし、格子状の仕切部材30の一番外側に位置する縦および横の仕切板30a,30bをもって、前記外枠14の側板18とする扱いにしてもよい。また、製氷室10の外枠14は、天板16と側板18とを一体成形したものでも良いし、天板16と側板18とを別体として構成したものであっても良い。
・無電解ニッケル-リンめっきの実量が充分発揮できる仕様で製氷室の表面処理を施すことで、従来の錫めっきでは腐蝕してしまう環境においても、腐蝕を生ずることなく稼働させることができる。
・従来の錫めっきでは腐蝕や劣化が起きてしまい使用が困難であった殺菌剤(次亜塩素酸ナトリウム、電解酸性水等)等の薬剤を使用してのメンテナンスが可能となり、装置をより衛生に保つことができる。
・熟練した作業者でなくても、接合剤の供給装置や加熱炉等における設定値を遵守することで、安定した品質の製氷室を量産することが可能となる。
・全ての部品を一度に接合出来るので仕掛部品がなくなり、効率的な生産が可能になって作業工程が削減できる。
・ろう付けを点付けで接合する場合には、局部加熱となるために製氷室本体に熱歪みを生じていた。しかし加熱炉による全体加熱により、熱歪みが解消した。そのため歪み修正が不要となった。
・製氷室における外枠の内面と仕切部材との接触面全体を接合するので、接合強度が向上し、表面処理の耐久性アップに寄与する。
・仕切部材のカシメ固定用の突部を不要とすることで、材料の歩留まり性が向上する。
・カシメ固定に関する加工(突部・カシメ孔)が不要になり、加工時間の短縮につながる。
・はんだ付けの場合、溶融温度はろう材よりも極めて低いため(例えば、リン銅ろうのろう付け温度は650~900℃、はんだは200~300℃)、銅の組織粗大化等の変化に対しても有利になる。
・ろう付けの場合、はんだ付けよりも材料強度が大きいので接合部位の強度がアップする。特に製氷小室は、仕切板を組合せている影響で強度に異方性があったが、ろう材で全て接合するので異方性がなくなる。
・ろう付けの場合、還元炉を使用し、フラックスレスとすることで後洗浄が不要となり、洗浄水、薬剤その他手間を大幅に削減することができ、低コスト化が図れる。
・ろう付けの場合、フラックスレスで接合を行った時に、洗浄後に残ってしまったフラックス残渣による表面処理不具合(めっきはじき、密着不良)の心配がなくなり、品質が安定化する。
・耐熱性を有する銅を使用の場合、高温でろう付けしても材料の強度低下がないため、ろう付け温度の高い、安価なろう材を使用しても製氷室の強度は保たれる。安価なろう材を使用することでコストを安く抑えることができる。
図9(a)は、基本的に図12および図13で説明した製氷室10の分解斜視図である。前記外枠14は、前記冷却パイプ48が配設される矩形状の天板16と、この天板16の各辺16bから下方に延出する矩形状の側板18とからなり、熱伝導率の良い銅等の金属板を折り曲げて成形される。すなわち外枠14は、図10(a)に示すように、前記天板16の四辺16bから一体的に延出している側板18を、該天板16の各辺16bに沿って、図10(b)の矢印fに示す同一方向へ折り曲げて、下方に開放する矩形の箱体として製作される。従って、図9(b)に拡大して示す如く、前記折り曲げにより隣り合う2つの前記側板18,18の各側端部は、前記外枠14のコーナー部20を形成している。このように折り曲げた外枠14の内部に、図9(a)に示す格子状の前記仕切部材30を外枠14の開口14a側から収容し、カシメ固定やろう付け等の手段により両部材14,30が接合される。前記カシメ固定を行う場合は、図12に説明した如く、前記仕切部材30の上部に突部31を設けると共に、前記天板16にカシメ孔16aを開設し、該カシメ孔16aに挿通して天板16の上面に突出させた突部31をハンマー等で圧潰することで行う。
図3および図4に示すように、前記製氷室10は、図9および図10で説明した製氷室10と同様に、矩形状天板16の四辺16bから夫々一体的に延出する矩形状側板18を、該天板16の各辺16bに沿って下方(同一方向)へ折り曲げられて下方(一方)に開放する箱状の外枠14と、前記外枠14の内部に配設されて、複数の製氷小室12を画成する仕切部材30とを備え、前記外枠14の上面に冷凍系46を構成する冷却パイプ48が密着的に蛇行配置されている。すなわち外枠14は、従来の外枠14と同様に、図4(a)に示す如く、外枠14を各側板18同士が接合されたコーナー部20で切り開いて平面上に展開した形状の金属板を形成し、前記各側板18を、図4(a)に2点鎖線で示す天板16の各辺16bに沿って、矢印aの如く下方へ折り曲げて成形される。そして、従来の外枠14と同様に、折り曲げ成形された外枠14の内部に格子状の前記仕切部材30が配設される。
図3(a)に示すように、前記側板18は、互いに対向して平行に延在する長尺な2つの側板18,18(以下、第1側板18Aという場合がある)と、互いに対向して平行に延在する短尺な2つの側板18,18(以下、第2側板18Bという場合がある)とから構成され、この互いに垂直な第1側板18Aおよび第2側板18Bの側端部により前記外枠14のコーナー部20が形成されている。なお、第1側板18Aおよび第2側板18Bの寸法は、製氷室10で製造する氷塊のサイズや量に合わせて設定されるものであり、両側板18A,18Bは同じ寸法であってもよい。また、第1側板18Aおよび第2側板18Bの上下寸法および厚み寸法D1,D2は、等しく設定されている。なお、図9(a)に示す前記仕切部材30を構成する各仕切板30a,30bの側端部に係止片を設け、前記側板18の下端部における前記係止片と対応する位置に、該係止片と係合する係合溝を形成してもよい。
図3(a)に示すように、前記外枠14において隣接してコーナー部20を形成する2つの前記側板18,18の側端部には、前記天板16に対して該側板18を折り曲げることで互いに嵌合する嵌合部22が設けられている。すなわち、外枠14には、前記第1側板18Aの側端部および第2側板18Bの側端部により形成される4つのコーナー部20の夫々に前記嵌合部22が設けられている。前記嵌合部22は、前記コーナー部20に臨む第1側板18A(一方の側板)の側端部(端部)に形成された延出部24と、該コーナー部20に臨む第2側板18B(他方の側板)の側端部(端部)に形成され、前記延出部24を接触状態で受け容れる切欠部26とを備えている。
図3(c)に示すように、前記第1側板18Aの側端部には、前記第2側板18Bの内面18Bbと同じ平面上に延在する該第1側板18Aの第1側端面19aから、該第2側板18Bの厚み方向に延出する前記延出部24が形成されている。この延出部24は、前記第1側板18Aにおける両下隅部に、該第1側板18Aと同じ厚みで、第1側板18Aの板面と同じ平面上に延在するよう設けられている。また、前記延出部24における前記第1側端面19aからの延出寸法L1は、少なくとも前記第2側板18Bの厚み寸法D2と等しい寸法に設定される。図3および図4に示した延出部24の前記延出寸法L1は、第2側板18Bの厚み寸法D2と等しくなるよう設定され、図4(b)に示す如く、該延出部24の延出端面24bと第2側板18Bの外面18Baとが揃うようになっている。なお、延出部24は、その高さ寸法H1(図4(a))を大きくすることで強度が増すようになっている。
図3(b)に示すように、前記第2側板18Bの側端部には、前記第1側板18Aの内面18Abと同じ平面上に延在する該第2側板18Bの第2側端面19bから、第1側板18Aの厚み方向に突出する突出部21が形成されている。この突出部21は、第2側板18Bの下端から前記第1側板18Aの前記延出部24に対応させて上方にずらした位置に設けられ、該突出部21の下面21aおよび前記第2側端面19bにより下方および側方に開放し、前記延出部24を接触状態で受け容れる前記切欠部26が形成されている。この切欠部26は、第2側板18Bの両下隅部に前記延出部24と対応的に設けられている。また、前記突出部21の前記第2側端面19bからの突出寸法L2は、第1側板18Aの厚み寸法D1と等しくなるよう設定され、図4(b)に示す如く、該突出部21の突出端面21bと前記切欠部26に嵌合した前記延出部24の外面(第1側板18Aの外面18Aa)とが揃うようになっている。また、図4(a)に示すように、前記第2側板18Bにおける前記切欠部26の上下方向の高さ(長さ)寸法H2は、前記第1側板18Aにおける前記延出部24の上下方向の高さ(長さ)寸法H1よりも若干大きく設定され、後述する如く、切欠部26に延出部24を接触的に受け容れ得るようになっている。
図4に示すように、前記嵌合部22は、前記外枠14の成形工程において、前記天板16の各辺16bから前記側板18を折り曲げた際に、前記切欠部26に前記延出部24が接触状態で受け容れられるようになっている。この切欠部26に延出部24が受け容れられた嵌合状態では、図4(b)に示すように、前記延出部24の上面24aと、前記切欠部26を形成する前記突出部21の下面21aとが密着的に当接すると共に、延出部24の内面と、切欠部26を形成する前記第2側端面19bとが密着的に当接して、前記第1側板18Aおよび前記第2側板18Bが構造的に固定されるようになっている。この嵌合部22の嵌合力は、前記製氷小室12内で成長する氷塊の膨張力等が各側板18に対して外向きに作用しても、前記延出部24および切欠部26の当接面の摩擦力により、第1側板18Aおよび第2側板18Bの接合が外れないよう設定されている。なお、前記延出部24の高さ寸法H1および前記切欠部26の高さ寸法H2を大きくすると、延出部24および切欠部26の密着する範囲(密着度)が増すので、両側板18A,18Bの接合強度が高くなる。
図3~図8に関して説明した製氷室は前述した構成に限定されるものでなく、例えば以下のように変更することが可能である。
(1) 一方の側板の端部に延出部を形成したが、該延出部の延出寸法は、他方の側板の厚み寸法より小さくても大きくてもよい。すなわち、延出部の少なくとも一部が、切欠部の少なくとも一部に受け容れられる関係であればよい。なお、延出部および切欠部の嵌合強度が高まるので、接合強度の観点からは延出部の延出寸法を他方の側板の厚み寸法より大きくするのが好ましい。
(2) 切欠部および該切欠部に受け容れられる延出部の形状は、例えば、三角形等であってもよい。
(3) 一方の側板に形成された延出部において、他方の側板に当接するよう折り曲げられた延出端部の形状は、矩形状に限定されるものではなく、例えば、三角形などであってもよい。
17 素地, 18 側板, 18A 第1側板(一方の側板),
18B 第2側板(他方の側板), 20 コーナー部,
23 無電解ニッケル-リンめっき被膜, 24 延出部,
26 切欠部, 29a 傾斜面, 30 仕切部材,
30a 横方向仕切板, 30b 縦方向仕切板, 40 水皿,
46 冷凍系, 48 蒸発器(冷却パイプ)
Claims (8)
- 蒸発器(48)により冷却される製氷室(10)に製氷水を循環供給して所要形状の氷を生成する自動製氷機において、
前記製氷室(10)の最外層に、10%~15%のリン成分を含有した無電解ニッケル-リンめっき被膜(23)が15μm以上の厚みで形成されている
ことを特徴とする自動製氷機。 - 前記無電解ニッケル-リンめっき被膜(23)は、前記製氷室(10)の素地(17)の外表面に直接形成されている請求項1記載の自動製氷機。
- 複数の横方向仕切板(30a)と縦方向仕切板(30b)とを格子状に組付けてなる仕切部材(30)を、天板(16)と側板(18)とからなる外枠(14)に配設して、下方に開放する製氷小室(12)を複数画成した製氷室(10)と、
前記外枠(14)の天板(16)に配設され、冷凍系(46)から供給される冷媒を循環させることで前記製氷室(10)を冷却する蒸発器(48)と、
前記製氷室(10)を下方から開閉自在に閉成して、前記複数の製氷小室(12)へ対応的に製氷水を供給する水皿(40)とを備え、
前記仕切部材(30)と外枠(14)とからなる前記製氷室(10)に無電解ニッケル-リンめっき被膜(23)を施した
ことを特徴とする自動製氷機。 - 前記仕切部材(30)が前記外枠(14)の天板(16)に接合される部位は直線で構成されると共に、前記仕切部材(30)と前記天板(16)との接合は軟ろうまたは硬ろうによるろう付けにより行われる請求項3記載の自動製氷機。
- 前記硬ろうによる前記仕切部材(30)と前記天板(16)との接合は、加熱炉で炉中ろう付けにより達成される請求項4記載の自動製氷機。
- 前記製氷室(10)は、前記天板(16)の四辺(16b)から延出する前記側板(18)を、該天板(16)の各辺(16b)に沿って同一方向へ折り曲げてなる箱状の前記外枠(14)と、前記外枠(14)の内部に格子状に配設されて、複数の前記製氷小室(12)を画成する前記仕切部材(30)とからなり、前記折り曲げによって隣り合う2つの前記側板(18,18)の端部が、前記外枠(14)のコーナー部(20)を形成しており、
前記コーナー部(20)に臨む前記一方の側板(18A)の端部に延出部(24)が形成されると共に、前記他方の側板(18B)の端部に前記延出部(24)を接触状態で受け容れる切欠部(26)が形成されている請求項1~5の何れか一項に記載の自動製氷機。 - 前記一方の側板(18A)における前記延出部(24)は、前記他方の側板(18B)の厚み寸法(D2)よりも大きく延出すると共に、
前記天板(16)に対し前記側板(18)を折り曲げた後に、前記一方の側板(18A)の前記延出部(24)を折り曲げて前記他方の側板(18B)に当接させるようにした請求項6記載の自動製氷機。 - 前記一方の側板(18A)における前記延出部(24)は、前記他方の側板(18B)の厚み寸法(D2)よりも大きく延出すると共に、延出方向に向けて斜角が大きくなる傾斜面(29a)を有し、
前記天板(16)に対し前記側板(18)を折り曲げた後に、前記一方の側板(18A)の前記延出部(24)を押圧して、前記傾斜面(29a)を前記他方の側板(18B)に当接させるようにした請求項6または7記載の自動製氷機。
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CN201680007923.7A CN107429962A (zh) | 2015-05-14 | 2016-03-15 | 自动制冰机 |
US15/541,256 US10274239B2 (en) | 2015-05-14 | 2016-03-15 | Automatic ice maker |
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JP2015-099251 | 2015-05-14 | ||
JP2015099249A JP6712442B2 (ja) | 2015-05-14 | 2015-05-14 | 自動製氷機 |
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US11255589B2 (en) | 2020-01-18 | 2022-02-22 | True Manufacturing Co., Inc. | Ice maker |
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CN107429962A (zh) | 2017-12-01 |
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US20180023874A1 (en) | 2018-01-25 |
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ES2877134T3 (es) | 2021-11-16 |
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