JP2016217549A - Ice-making machinery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate substantial problems in view of food sanitation management occurred in peeling-off of rusts and dropping from ice-making chambers and their mixing in ice-making water or ice blocks due to contact of applied atmosphere of an ice-making machinery with substance that promotes corrosion at the ice-making chambers under an arrangement that the inner and outer surfaces of the ice-making chambers at a closed cell-type injection type ice-making machinery are applied with molten tin plating surface treatment for preventing occurrence of rusts in view of food sanitation.SOLUTION: Anti-corrosion characteristic of ice-making chambers 12 is remarkably improved by applying electroless nickel-phosphorus coating to surfaces of the ice-making chambers 12.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a jet type ice making machine, and more specifically, an ice making chamber that defines a large number of ice making chambers that open downward is closed with a tiltable water dish, and ice making water is supplied to each ice making chamber from the water dish. The present invention relates to an ice making chamber of a so-called closed cell type spray ice making machine.

  A jet ice maker that continuously produces a large number of ice blocks is widely used in facilities such as coffee shops and restaurants, and other kitchens. For example, as shown in FIG. 4, this jet type ice making machine has an ice making chamber 12 in which a large number of ice making chambers 10 opening downward are defined, and is led out from a freezing mechanism 16 to a top plate 14 of the ice making chamber 12. The evaporated tubes 18 are arranged in a meandering manner in close contact with each other. The refrigeration mechanism 16 includes a refrigerant compressor 20 flowing through a pipeline system, a condenser 24 for condensing refrigerant, an expansion valve 22 for refrigerant, the evaporator pipe 18 connected to the expansion valve 22 and other air cooling fans for the condenser 24. 26. Then, when the expansion valve 22 is opened, a refrigerant is supplied to the evaporation pipe 18 to cool the ice making chamber 12 to below the freezing point. A bypass pipe 28 is connected to the discharge side of the compressor 20 and the refrigerant inlet of the evaporation pipe 18, and hot gas is supplied to the evaporation pipe 18 by opening a hot gas valve 30 provided in the bypass pipe 28. It can be supplied.

  When the spray type ice making machine enters the ice making operation, as shown in FIG. 4, ice making water W is jetted and supplied from below to each ice making chamber 10 that opens downward in the ice making chamber 12. Since each ice making chamber 10 is cooled below the freezing point, a part of the ice making water W sprayed and supplied is instantly frozen on the inner surface of the ice making chamber 10 and gradually grows to form ice blocks in each ice making chamber. Further, the ice making water W that has been supplied to the ice making chamber 10 but did not freeze in the ice making chamber falls and is collected in the ice making water tank 48 shown in FIG. In this way, it is injected in a circulating manner.

JP 2009-30816 A

  As will be described later with reference to FIG. 3, the ice making chamber 12 includes an ice making frame body including a rectangular top plate 14 and side plates surrounding the four sides of the top plate 14, and a plurality of the ice making chambers 12 positioned inside the ice making frame body. The ice making chamber 10 is composed of a partition that defines a lattice shape. In this case, the ice making frame body and the partition plate are assembled by inserting a protrusion projecting from a required portion of the partition body into a hole corresponding to the top plate 14 and then inserting the protrusion. This is done by caulking to crush the head. However, caulking is performed only with a plurality of protrusions inserted into the hole. For this reason, since a large expansion pressure at the time of ice making operation is applied during ice making operation in each ice making chamber 10, there is a disadvantage that the connection between the ice making frame and the partitioning body becomes loose over time and becomes glazed. In this case, various surface treatments applied to the ice making chamber 12 are deteriorated or peeled off, and there is an adverse effect of reducing durability.

  In order to improve this, a hole formed in the top plate 14 and a fitting portion between the projection of the partition plate are joined by soldering or brazing. However, since the ice making frame body and the partition body 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 a high temperature during brazing. In order to avoid such strength reduction due to softening, 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.

  In addition, since ice making water is circulated and supplied to the ice making chambers 12 and ice blocks are formed inside each ice making chamber 10, a surface treatment of molten tin plating is generally adopted from the viewpoint of food hygiene. . Although this tin-plated film is relatively resistant to rusting, if the atmosphere used in the ice making machine contains a substance that promotes corrosion, such as an oxidizing substance, the ice making frame and the partitioning body may become rusted over time. Corrosion products may be produced due to the above. Such a corrosion product is easily removed from the plating film, and if it is mixed into ice-making water or the ice block after generation, there is a possibility that it may become a problem in food hygiene management.

  In view of this, the present invention provides a so-called closed cell type ice making machine that supplies ice making water to each ice making chamber in a state where the ice making room is closed with a water dish from below, and the ice making unit constituting the ice making room is provided. It aims at improving corrosion resistance compared with the surface treatment by the conventional tin plating by giving an electroless nickel phosphorus coating to a frame and a partition.

In order to solve the above-mentioned problems and achieve the intended object, the invention according to claim 1 is characterized in that a partition body formed by assembling a plurality of lateral partition plates and longitudinal partition plates in a lattice shape, An ice making chamber having a plurality of ice making chambers that open downward and an ice making chamber that is arranged on a top plate of the ice making frame and circulating a refrigerant supplied from a refrigeration mechanism. An evaporation pipe for cooling the ice making chamber, and a water tray for closing the ice making chamber so as to be openable and closable from below and supplying ice making water correspondingly to the plurality of ice making chambers, The gist is that an electroless nickel-phosphorus coating is applied to the ice making chamber composed of an ice making frame.
According to the first aspect of the present invention, even if an oxidizing substance that promotes corrosion is present in the use atmosphere at the site where the closed cell type injection type ice making machine is operating, the ice making chamber is rusted and the corrosion product. Is less likely to occur.

In the invention which concerns on Claim 2, while the part where the said partition is joined to the top plate of the said ice making frame is comprised by a straight line, the joining of the said partition and the said top plate will be based on a soft solder or a hard solder The gist is that it is done by attaching.
According to the invention which concerns on Claim 2, since it is not necessary to perform the process for crimping | bonding to the top plate of a partition and an ice-making frame, the number of manufacturing processes can be reduced.

The gist of the invention according to claim 3 is that the joining of the partition body and the top plate by the hard solder is achieved by brazing in a furnace in a heating furnace.
According to the invention which concerns on Claim 3, whole heating can be achieved by heating in a furnace with a partition and the top plate of an ice-making frame, and the thermal distortion by local heating does not arise. For this reason, the distortion correction work as a post-process becomes unnecessary.

  According to the closed cell type jet ice making machine according to the present invention, the corrosion resistance of the ice making chamber subjected to the surface treatment can be remarkably improved. Therefore, even if it is used for a long time, There is no possibility that corrosion products such as rust will be mixed in.

It is a partially cutaway side view showing a closed cell type jet ice making machine employing an ice making chamber according to the present invention. It is a perspective view of the ice making room which concerns on this invention, Comprising: The state which decomposed | disassembled into the ice making frame body which arrange | positioned the evaporator in the upper part, and the grid | lattice-like partition is shown. It is a perspective view which shows the partition shown in FIG. 2 in the state decomposed | disassembled into the vertical direction partition and the horizontal direction partition. It is the schematic which shows the basic structure of the ice making chamber in a jet type ice making machine, and the freezing mechanism connected to the evaporation pipe provided in this ice making chamber.

  Next, an injection type ice making machine according to the present invention will be described with reference to the accompanying drawings. Here, as shown in FIG. 1, the jet type ice making machine of the present invention is of a so-called closed cell type in which an 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 machine casing 32 shown in FIG. 1, and an ice storage chamber for storing a large number of ice blocks manufactured and dropped by the ice making unit 34 (lower in the interior) ( (Not shown) is provided. In the ice making unit 34, the ice making chamber 12 is fixed below a beam member 36 disposed horizontally in the housing 32, and the large number of ice making chambers 10 are opened directly below. Further, in FIG. 1, a support shaft 40 is horizontally inserted into a bracket 38 suspended to the left side of the beam member 36, and the support shaft supports the water dish 42 so as to be tilted downward in a slanting direction. Each ice making chamber 10 in the chamber 12 is closed from below. That is, 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. An injection hole 44 corresponding to each ice making chamber 10 is formed in the upper surface of the water tray main body 46.

  During the ice making operation, the water tray 42 is held in a horizontal position by the actuator 50 shown in FIG. 1, and closes the ice making chamber 12 from below. The ice making water in the tank 48 is pumped by a pump 52 shown in the figure, and is sprayed and supplied to the corresponding ice making chambers 10 from the injection holes 44 in the water dish 42, and ice blocks gradually grow in the ice making chambers 10. Let When the completion of ice making is detected, the actuator 50 reverses to forcibly tilt the water tray 42 from the ice making chamber 12 and open the ice making chamber 12. Also, the hot gas valve 30 shown in FIG. 4 is opened, and hot vaporized refrigerant (hot gas) from the compressor 20 is supplied to the evaporation pipe 18 to heat the ice making chamber 12. The ice blocks formed in each ice making chamber 10 fall at a required timing and are stored in the ice storage chamber (not shown).

  FIG. 2 is a perspective view of the ice making chamber 12 to which the present invention is applied, and an ice making frame 54 constituting the outside of the ice making chamber 12 and a lattice-like structure disposed inside the ice making frame 54. It is disassembled and shown as a partition 56. The ice making frame 54 includes a rectangular top plate 14 and side plates 58 extending in four directions of the top plate 14, and each side plate 58 is bent in the same direction along each side of the top plate. A rectangular box is formed. The top plate 14 is provided with the evaporating pipe 18 led out from the refrigeration mechanism 16 in a meandering manner.

  For example, as shown in FIG. 3, the plurality of ice making chambers 10 are defined in the partition 56 by combining a plurality of horizontal partition plates 60 and vertical partition plates 62 and partitioning the interior in a lattice pattern. . 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, a portion of the ice-making frame body 54, which will be described later, abuts against the back surface of the top plate 14 is formed of a straight line, and has a caulking joint projection. Absent. The ice making frame 54 and the grid-like partition 56 are 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 ice making frame 54, the partition 56 formed of vertical and horizontal partition plates, the evaporation pipe 18, and other parts such as a bracket (not shown) for attaching the temperature sensor are subjected to degreasing and cleaning prior to assembling them. Remove the fat components completely.

  The ice making chamber 12 is obtained by disposing the lattice-like partition 56 inside the box-shaped ice making frame 54 and joining them together. The ice making frame 54 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 solder) with a melting point of 450 ° C. or lower is used is called “soldering”, and the melting point is 450 ° C. or higher. There is a comment that the case of using a bonding agent (hard brazing) is called “brazing”. Therefore, in the present invention, both the case of using a soft solder and the case of using a hard solder will be referred to as so-called “brazing”.

  Since the “solder” and “brazing material” include sheet-like, foil-like, linear and other paste-like forms in addition to rod-like ones, those having an appropriate form are selected for use. In the joining operation, for example, in the partition 56 shown in FIG. 2, after placing a rod-shaped brazing material (not shown) on the upper surface of the vertical partition plate 62, the box-shaped ice making frame 54 is covered from above. Thus, the rod-like brazing material is closely interposed between the back surface of the top plate 14 in the ice making frame 54 and the vertical partition plate 62. Next, the ice making chamber 12 composed of the ice making frame 54 and the partition 56 is placed in a heating furnace heated to a predetermined temperature range, and brazing in the furnace for a predetermined time is performed. When 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.

  Instead of the rod-like brazing material described above, a paste-like brazing material may be used and applied to the back surface of the top plate 14 before the partition 56 is disposed. In this case, a paste-like brazing material may be applied to the entire back surface of the top plate 14, but the amount of use can be reduced by applying only to the portion where the vertical and horizontal partition plates 60 and 62 abut on the partition 56. You may save money. Further, when brazing in the furnace described above, the evaporator tube 18 is placed on the top plate 14, or other parts that require brazing joining such as a temperature sensor mounting bracket are attached, At the same time, brazing with a heating furnace may be performed. When copper is selected as the material for the ice making frame 54 and the partition 56, the interior of the furnace is exposed to a high temperature in brazing using the hard solder, so that the copper is annealed and the hardness decreases. There are harmful effects. For this reason, when brazing copper, it is preferable to carry out at the lowest possible brazing temperature. For example, 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. As a result, the maximum temperature of the brazing temperature is lowered and the high-temperature exposure time in the furnace is shortened, so that the softening of copper, which is the material of the ice making frame 54 and the partition 56, can be minimized. It is.

  Further, as the material for the ice making frame 54 and the partition 56, a copper alloy having heat resistance and not impairing the characteristics as a good thermal conductor is used, and the entire contact portion of both the members 54 and 56 is brazed. You may join. Here, 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.

  In the ice making chamber 12 obtained after the joining of the ice making frame 54 and the partition 56 is finished, the residue of the flux generated at the time of brazing adheres to the surface. Particularly in the case of soldering using the soft solder, it is common to use a large amount of flux in order to improve the joining characteristics. 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. However, in the case of brazing using the hard solder, 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. Here, 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.

  Next, an electroless nickel-phosphorous plating film is applied to the surface of the ice making chamber 12 (all the inner and outer surfaces of the ice making frame 54 and the partition 56) after the surface cleaning process. That is, an electroless nickel-phosphorus plating film is applied to the outermost layer of the ice making chamber 12, and in this case, the phosphorus concentration is 10% or more (high phosphorus type), and the film thickness is preferably 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 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. 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 so-called soaking in which the ice making chamber 12 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 chamber 12 with nickel, palladium, or the like, the electroless nickel-phosphorous plating is formed thereon. It may be a two-layer treatment. Further, the surface of the ice making chamber 12 may be subjected to copper plating, nickel plating, and then the electroless nickel-phosphorus plating on the nickel plating. In particular, in the case of soldering with the soft solder, since precipitation of electroless plating such as tin and lead is hindered (so-called “catalytic poison”), the ice making chamber 12 has two layers or three layers. It is highly necessary to apply nickel plating or copper plating to the substrate.

By the way, the ice making chamber 12 shown in FIG. 2 and FIG. 3 combines vertical and horizontal partition plates 60 and 62 in a lattice shape inside a rectangular box composed of a rectangular top plate 14 and four side plates 58. The partition 56 is accommodated. However, as shown in 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 lattice partition function as the side plates of the ice making chamber. In this case, a rectangular box-shaped ice making chamber is configured simply by covering the grid-like partition plate with a top plate.
Therefore, in the embodiment of the present invention, the grid-like partition 56 and the side plate 58 are separated as separate bodies. However, the present invention is directed to the vertical and horizontal partition plates 60 positioned on the outermost side of the grid-like partition 56. , 62 may be handled as the side plate. Further, the rectangular box constituting the ice making chamber may be formed by integrally forming the top plate and the side plate, or the top plate and the side plate may be configured separately as shown in the embodiment.

According to the present invention, the following advantageous effects can be obtained.
-By performing the surface treatment of the ice making chamber with specifications that allow the actual amount of electroless nickel-plating to be sufficiently exerted, it can be operated without causing corrosion 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. Can be kept in.
-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.
-Since all parts can be joined at once, there are no work-in-progress parts, enabling efficient production and reducing work processes.
・ When joining by brazing, the ice making chamber itself was thermally distorted due to local heating. However, the heat distortion was eliminated by the whole heating in the heating furnace. This eliminates the need for distortion correction.
-Since the main body and the partition plate join the entire contact surface, the case joining is improved and the surface treatment durability is improved.
-The yield of the material is improved by eliminating the caulking protrusions of the partition plate.
・ Processing (protrusions and caulking holes) related to the caulking part is eliminated, leading to a reduction in processing time.
In the case of soldering, 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.), so that it is resistant to changes such as copper coarsening It will be advantageous.
・ In the case of brazing, the strength of the joint is increased because the material strength is higher than that of soldering. In particular, 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.
-In the case of brazing, 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.
-In the case of 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.
-When copper having heat resistance is used, 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.

10 ice making chamber, 12 ice making chamber, 14 top plate, 16 refrigeration mechanism, 18 evaporation tube,
42 water tray, 54 ice making frame, 56 partition, 58 side plate, 60 lateral partition plate,
62 Vertical divider

As will be described later with reference to FIG. 3, the ice making chamber 12 includes an ice making frame body including a rectangular top plate 14 and side plates surrounding the four sides of the top plate 14, and a plurality of the ice making chambers 12 positioned inside the ice making frame body. The ice making chamber 10 is composed of a partition that defines a lattice shape. In this case, the ice making frame body and the partition plate are assembled by inserting a protrusion projecting from a required portion of the partition body into a hole corresponding to the top plate 14 and then inserting the protrusion. This is done by caulking to crush the head. However caulking is made in only a plurality of impact force inserted into the hole. For this reason, since a large expansion pressure at the time of ice making operation is applied during ice making operation in each ice making chamber 10, there is a disadvantage that the connection between the ice making frame and the partitioning body becomes loose over time and becomes glazed. In this case, various surface treatments applied to the ice making chamber 12 are deteriorated or peeled off, and there is an adverse effect of reducing durability.

To improve this, a collision force Metropolitan of the fitting portion of the partition plate hole bored in the top plate 14, has been performed to be joined by soldering or brazing. However, since the ice making frame body and the partition body 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 a high temperature during brazing. In order to avoid such strength reduction due to softening, 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.

In addition, since ice making water is circulated and supplied to the ice making chambers 12 and ice blocks are formed inside each ice making chamber 10, a surface treatment of molten tin plating is generally adopted from the viewpoint of food hygiene. . Although the coating film by hot dip tin plating is relatively hard to rust, if the atmosphere used in the ice making machine contains a substance that promotes corrosion, such as an oxidizing substance, the ice making frame and the partitioning body over time. Corrosion products such as rust may be generated. Such corrosion products easily peeled off from the molten tin plating film, when it is mixed into the ice mass after the ice-making water and generation, there is a fear that the food sanitation management problems.

In order to solve the above-mentioned problems and achieve the intended object, the invention according to claim 1 is characterized in that a partition body formed by assembling a plurality of lateral partition plates and longitudinal partition plates in a lattice shape, An ice making chamber having a plurality of ice making chambers that open downward and an ice making chamber that is arranged on a top plate of the ice making frame and circulating a refrigerant supplied from a refrigeration mechanism. An evaporation pipe for cooling the ice making chamber, and a water tray for closing the ice making chamber so as to be openable and closable from below and supplying ice making water correspondingly to the plurality of ice making chambers, The gist is that an electroless nickel-phosphorous plating film is applied to the ice making chamber composed of the ice making frame.
According to the first aspect of the present invention, even if an oxidizing substance that promotes corrosion is present in the use atmosphere at the site where the closed cell type injection type ice making machine is operating, the ice making chamber is rusted and the corrosion product. Is less likely to occur.

Claims (3)

A partition body (56) formed by assembling a plurality of horizontal partition plates (60) and vertical partition plates (62) in a lattice form, an ice making frame body (top plate (14) and side plates (58)) ( 54), an ice making chamber (12) that defines a plurality of ice making chambers (10) that open downward, and
An evaporation pipe (18) disposed on the top plate (14) of the ice making frame (54), for cooling the ice making chamber (12) by circulating a refrigerant supplied from a refrigeration mechanism (16);
A water tray (42) for closing the ice making chamber (12) so as to be openable and closable from below, and supplying ice making water correspondingly to the plurality of ice making small chambers (10),
An ice making machine, wherein an electroless nickel-phosphorus coating is applied to the ice making chamber (12) comprising the partition (56) and the ice making frame (54).   The part where the partition body (56) is joined to the top plate (14) of the ice making frame (54) is constituted by a straight line, and the joining of the partition body (56) and the top plate (14) is The ice making machine according to claim 1, which is performed by brazing with soft or hard solder.   The ice making machine according to claim 2, wherein the joining of the partition body (56) and the top plate (14) by the hard solder is achieved by brazing in a furnace in a furnace.

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