JPH0426852Y2 - - Google Patents

Description

[Detailed Description of the Invention] a. Industrial Application Field The present invention relates to a cylindrical evaporator equipped with a cylindrical refrigerating casing.

b. Prior Art A cylindrical evaporator is used in the interior of a cylindrical member of, for example, an auger-type ice maker, a drum-type ice maker, a frozen dessert machine such as a soft-serve ice cream maker, a water cooler, a frozen carbonated beverage machine such as a beer server, etc. It is used to produce foods such as ice and soft serve ice cream by cooling liquids such as water and syrup supplied to the machine.

An example in which a conventionally used general cylindrical evaporator is applied to an auger ice maker is shown in FIGS. 8 to 10. In FIG. 8, the cylindrical member 51
A rotatably supported auger 57 is disposed inside the cylindrical member 51, an evaporation tube 52 is fixed to the outer periphery of the cylindrical member 51, and a heat insulating material 53 is disposed on the outside thereof. The cylindrical member 51 is made of a material such as stainless steel, copper alloy, or aluminum, and the evaporation tube 52 is made of a material such as copper or aluminum, and is tightly wound spirally around the outer peripheral surface of the cylindrical member 51 and soldered or brazed. It is fixed by A certain amount of ice-making water is supplied into the cylindrical member 51, and a thin layer of ice formed on the inner wall surface of the cylindrical member by cooling the evaporator tube 52 is scraped off by an auger 57 and guided upward.

In the cylindrical evaporator shown in FIG. 9, a wire rod 68 is spirally wound around the outer circumferential surface of an inner tube 61 and sealed by welding or the like, and an outer tube 69 is sealed around the outer circumference of the wire rod 68 by welding or the like. It is fixed. inner cylinder 61,
A spiral passage 65 defined by the wire rod 68 and the outer cylinder 69 constitutes a refrigerant passage through which the refrigerant of the refrigeration system passes.

In the cylindrical evaporator shown in FIG.
A cylindrical enclosing member 75 having a spiral protrusion 74 projecting outward in the radial direction is sealed and fixed to the outer peripheral surface of the cylindrical member 71 by welding or the like. A spiral passage 78 defined by the cylindrical member 71 and the projection 74 of the enclosing member constitutes a refrigerant passage through which the refrigerant of the refrigeration system passes.

Among the conventional cylindrical evaporators described above, in the one shown in FIG.
Not only is it troublesome to wrap or solder the evaporator tube 52 tightly around the outer circumferential surface of the cylindrical member 51, but also to finish the inner surface of the cylindrical member after fixing the evaporator tube 52 to the outer circumferential surface of the cylindrical member 51, the performance of the cylindrical evaporator is was also uneven and unreliable.

In the cylindrical evaporator shown in FIG. 9, it is necessary to weld the inner and outer cylinders to the inner and outer peripheries of the wire rod 68, which makes processing work for forming the refrigerant passage 65 of the refrigeration system difficult, and also requires The work of arranging the wire rod 68 in a spiral shape according to the processing precision required was troublesome.

Further, in the cylindrical evaporator shown in FIG. 10, processing is difficult because it is necessary to form a spiral groove in the surrounding member 75 to form the protrusion 74. Further, since the refrigerant passage 78 is formed by joining the enclosing member 75 to the outer circumferential surface of the cylindrical member 71 by brazing, it is necessary to finish the joint with high precision and maintain sufficient leak resistance. moreover,
Since the enclosing member 75 is used to form the refrigerant passage 78, the leak resistance and pressure resistance of the enclosing member 75 are important, and the troublesome work of high-precision machining, thick plate machining, etc. is required for the enclosing member 75. This also led to an increase in product costs.

The auger ice maker shown in FIGS. 9 and 10 is equipped with an ice making mechanism for producing flake ice with relatively low hardness, but when producing chip ice with high hardness, for example, as shown in FIG. As shown in FIG. 2, a convex anti-rotation plate 59 extending in the axial direction is fixed to the inner surface of the cylindrical member 51 by welding or the like. Conventionally, first, the inner surface of the cylindrical member 51 is processed and the rotation prevention plate 59 is welded to the inner surface, and then,
A process is used in which the evaporation tube 52 of the refrigeration system is tightly wound around the outer peripheral surface of the cylindrical member 51 by soldering or the like, and then fixed in a drying oven. As a result, distortion occurs in the cylindrical inner surface of the cylindrical member 51, making it impossible to make the inner surface a perfect circle.
As a result, the distance between the cutting edge 57a of the auger and the inner surface of the cylindrical member 51 becomes uneven, and the cutting edge 57a of the auger becomes uneven.
An accident occurred in which 7a came into contact with the inner surface of the cylindrical member 51.

c Problems that the invention aims to solve As mentioned above, in the conventional cylindrical evaporator,
The machining precision for arranging the refrigerant passages on the circumferential surface of the cylindrical member is severe or it is difficult to achieve this precision, and since there are many work steps, the work is cumbersome and the manufacturing cost is high.

d Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a cylindrical evaporator equipped with a cylindrical refrigeration casing, in which the refrigeration casing has an inner cylindrical member;
An enclosure member surrounding the outer periphery of the cylindrical member, and a cylindrical refrigerant passage tube disposed between the cylindrical member and the enclosure member, the refrigerant passage tube having an inner surface, an outer surface, and a cylindrical shape. In some cases, a notch is formed between the inner surface and the outer surface to form a single spiral refrigerant passage in cooperation with the cylindrical member and the surrounding member, and The inner surface and the outer surface are in surface contact with the outer circumferential surface of the cylindrical member and the inner circumferential surface of the enclosing member, respectively.

e Effect In the cylindrical evaporator having the above-described configuration, the refrigerating casing has a three-layer structure of a cylindrical member, a refrigerant passage tube, and a surrounding member, and the refrigerant passage is defined by these three members. Since the refrigerant passage cylinder is formed into a cylindrical shape, it can be easily mounted on the circumferential surface of the cylindrical member, and the refrigerant thus circulates within the refrigerant passage cylinder to cool the refrigeration casing.

f. Example Next, a preferred example of the cylindrical evaporator of the present invention will be described in detail with reference to the drawings.

FIG. 5 shows an embodiment in which the cylindrical evaporator of the present invention is applied to an auger-type ice maker, and FIGS. 6 and 7 show enlarged portions A and B thereof.
A rotatably supported auger 7 is disposed inside the cylindrical member 1, and is designed to scrape off a thin layer of ice formed on the inner wall surface of the cylindrical member 1 and guide it upward. A refrigerant passage cylinder 12 forming a spiral refrigerant passage 8 is disposed on the outer peripheral surface of the cylindrical member 1 . As shown in FIG. 1, the refrigerant passage cylinder 12 includes a refrigerant passage cylinder 12a formed by forming a band-shaped plate 14 into a cylindrical shape to form a spiral refrigerant passage 8a;
Alternatively, as shown in FIG. 3, the refrigerant passage pipe 12b is formed by pressing the flat plate 15 into a cylindrical shape to form a spiral refrigerant passage 8b. Cutout portions 14a and 14b are provided at the upper portions of the refrigerant passage cylinders 12a and 12b to correspond to the rotation prevention plate 9 that is fixed to the upper inner wall surface of the cylindrical member 1 and extends in the axial direction. The refrigerant passage cylinder 12 having such a configuration is inserted onto the outer circumferential surface of the cylindrical member via copper foil, and temporarily fixed at several predetermined positions by spot welding for positioning.

A cylindrical enclosing member 6 is disposed on the outer peripheral surface of the refrigerant passage cylinder 12, and the enclosing member 6
In case a, the cylindrical enclosure member 6 shown in FIG.
a, and in the case of the refrigerant passage cylinder 12b,
It is composed of a cylindrical enclosing member 6b shown in FIG. The surrounding members 6a and 6b are respectively connected to the refrigerant passage cylinder 1.
2a, 12b, the inlet hole 17 of the refrigerant passage
a, 17b, and refrigerant passage outlet holes 18a, 18b.
and a notch 19 corresponding to the notches 14a and 14b.
a, 19b. The enclosing member 6 having such a configuration is placed on the outer circumferential surface of the refrigerant passage cylinder 12.
It is inserted through the copper foil while aligning the inlet hole, outlet hole, and notch of the refrigerant passage, and is preferably temporarily fixed by spot welding at a position corresponding to the spot welding position of the refrigerant passage tube relative to the cylindrical member 1. . The cylindrical member 1, the refrigerant passage cylinder 12, and the enclosure member 6 constitute a frozen casing.

In this way, the refrigerant passage cylinder 12 is formed on the outer peripheral surface of the cylindrical member 1.
are spot-welded, and the enclosure member 6 is spot-welded to the outer peripheral surface of the refrigerant passage cylinder, and then the cylindrical member 1, the refrigerant passage cylinder 12, and the enclosure are assembled by heating processing means such as brazing them in a vacuum furnace. The members 6 are secured together in a sealing relationship. Then, the inlet holes 17a, 17b and the outlet holes 18a, 18b of the refrigerant passage.
A refrigerant connection pipe (not shown) is connected to the cylindrical member 1, and a water supply port 10 for supplying ice-making water into the cylindrical member 1 is attached by welding or the like. Thereafter, the inner surface 1a of the cylindrical member 1 is finished by cutting, thereby making it possible to protrudely weld the rotation prevention plate 9 necessary for making chip ice or the like in the final step.

As mentioned above, the work process that requires heating is performed by brazing in a vacuum furnace to reduce the occurrence of distortion, and the inner surface of the cylindrical member 1 can be finished after the heating work process, so the cylindrical evaporator The roundness, straightness, etc. of the inner surface of the cylindrical member, which require the highest dimensional accuracy in a container, can be easily obtained.

In the above embodiment, a cylindrical evaporator was described in which the refrigerant in the refrigerant passage and the cylindrical member exchange heat on the outer peripheral surface of the cylindrical member. The present invention can also be applied to a cylindrical evaporator in which a cylindrical enclosing member is arranged.

Furthermore, in the above embodiment, the cylindrical evaporator of the present invention was applied to an auger-type ice maker; The cylindrical evaporator of the present invention can be widely applied to frozen carbonated beverage manufacturing machines such as the following.

g. Effects of the invention As described above, according to the cylindrical evaporator of the invention,
It is possible to eliminate the troublesome work such as strict processing accuracy when disposing the member defining the refrigerant passage on the circumferential surface of the cylindrical member, improve processing accuracy and eliminate processing steps, and further The manufacturing cost can be reduced and the efficiency of heat exchange can be improved. Further, since distortion of the cylindrical member is eliminated and its roundness and straightness are obtained, the distance between the cylindrical member and the auger blade becomes uniform, and accidents in which the auger blade comes into contact with the inner wall surface of the cylindrical member are eliminated. Therefore, the reliability of a cylindrical evaporator in which an auger, a peeling blade, a stirring device, etc. are provided inside the evaporator can be improved.

Further, according to the present invention, the cylindrical refrigerant passage cylinder has an inner surface and an outer surface, and when shaped into a cylinder, cooperates with the cylindrical member and the surrounding member to form one spiral refrigerant passage. a notch formed through the inner surface and the outer surface, and portions of the inner surface and the outer surface other than the notch are in surface contact with the outer circumferential surface of the cylindrical member and the inner circumferential surface of the enclosing member, respectively. Therefore, it is possible to particularly strongly join the enclosing member to the refrigerant passage cylinder, and the pressure resistance strength of the refrigerating casing can be increased. Furthermore,
Since the refrigerant passage tube is in surface contact with its inner and outer surfaces, it is substantially not deformed even if compressive stress is applied from the enclosing member, and the refrigerant passage is never blocked.

[Brief explanation of the drawing]

1 and 2 are perspective views showing a first embodiment of a refrigerant passage cylinder and a corresponding enclosure member of a cylindrical evaporator according to the present invention, and FIGS. 3 and 4 are perspective views showing a cylindrical type evaporator according to the present invention. A perspective view showing a second embodiment of the refrigerant passage pipe of the evaporator and a corresponding enclosure member, and Fig. 5 shows a partial vertical section of an example in which the cylindrical evaporator of the present invention is applied to an auger ice maker. Figures 6 and 7 are respectively an enlarged sectional view of section A in Figure 5 and an enlarged perspective view of Figure B, and Figures 8 to 10 are conventional auger ice making machines equipped with a cylindrical evaporator. FIG. 2 is a partially cross-sectional view of the machine. 1... Cylindrical member, 6, 6a, 6b,... Enclosing member, 7... Auger, 8, 8a, 8b... Refrigerant passage, 9... Rotation prevention plate, 12, 12a, 12b,
... Refrigerant passage cylinder, 14 ... Band-shaped plate, 14a, 1
4b... Notch, 15... Flat plate, 17a, 17b
...Entrance hole, 18a, 18b...Exit hole, 19
a, 19b... Notch.

Claims (1)

[Scope of utility model registration request] In a cylindrical evaporator including a cylindrical frozen casing, the frozen casing includes an inner cylindrical member 1, a surrounding member 6 surrounding the outer periphery of the cylindrical member,
A cylindrical refrigerant passage tube 12 is provided between the cylindrical member 1 and the enclosing member 6, and the refrigerant passage tube 12 has an inner surface and an outer surface, and when formed into a cylindrical shape, the cylindrical member 1 and It has a notch that is penetrated between the inner surface and the outer surface so as to cooperate with the enclosing member 6 to form one spiral refrigerant passage 8, and the inner and outer surfaces other than the notch have a The outer peripheral surface of the cylindrical member 1 and the surrounding member 6
A cylindrical evaporator characterized in that each surface is in contact with the inner peripheral surface of the evaporator.