JP2007057205A - Auger type ice making machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an auger type ice making machine without causing a pipe crack in the uppermost stage of a cooling pipe wound on the outer periphery of an ice making cylinder. <P>SOLUTION: A refrigerant evaporating pipe 3, a conductor 10 and the ice making cylinder 2 are joined by winding the conductor 10 on an outer peripheral surface of the ice making cylinder 2 of the auger type ice making machine and the upper end periphery of the refrigerant evaporating pipe 3. A fillet of a specific shape is always formed in a joining part. Since the fillet is formed of a structural material, strength of the joining part is increased, and stress concentration can be prevented. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an auger type ice making machine including an auger, and more particularly to a joint structure between an ice making cylinder and a refrigerant evaporation pipe.

  2. Description of the Related Art Conventionally, an auger type ice making machine that can continuously produce small ice pieces (compressed ice) such as chip ice and flake ice is known as one of ice making machines that produce ice pieces of a required shape. The auger type ice maker is briefly described. The auger type ice maker includes an ice making cylinder inside a refrigeration casing, and an evaporator derived from the refrigeration mechanism is wound around the outer periphery of the ice making cylinder. Inside the ice making cylinder, an auger having a spiral blade is arranged on the outer periphery, and this auger is configured to rotate by a gear motor through a coupling. A fixed blade for compressing flaky ice is disposed inside the upper part of the ice making cylinder inside the refrigeration casing. A supply pipe for supplying ice making water from the ice making water tank to the inside of the ice making cylinder is disposed below the freezing casing.

  When the ice making operation of the auger type ice making machine configured in this way is started, the ice making water supplied from the ice making water tank to the ice making cylinder gradually starts freezing from the inner wall surface of the ice making cylinder, and layered thin ice is formed. The The thin ice is transported upward while being peeled off by the spiral blade of the auger. The conveyed flaky ice is compressed by a fixed blade to form chip ice, and is appropriately stored in an ice storage or the like.

  For example, as shown in FIG. 4, the evaporator of the auger type ice making machine has a cross-section protruding in a mountain shape on the outer peripheral surface of the ice making cylinder 2 made of a copper tube having a surface plated with solder. A copper cooling pipe 3 serving as an evaporation tube is wound around the core wire 20 and then the ice-making cylinder 2 is heated from the inner surface by a heater. The molten solder 30 is introduced into the gap formed between the core wire 20 and the cooling pipe 3 is joined to the outer peripheral surface of the ice making cylinder 2 (for example, Patent Documents 1 and 2). reference). In this way, the formation of voids in the solder 30 to which the cooling pipe 3 is joined is prevented by joining with the solder 30 using the core wire 20 projecting in a cross-sectional mountain shape so as to fill the gap between the adjacent cooling pipes 2. It is possible to realize an evaporator having a long life and excellent characteristics.

JP 2004-332951 A US Pat. No. 4,739,630

  However, as shown in FIG. 5, there is a possibility that a crack 40 may occur inside the uppermost cooling pipe 3 a wound around the ice making cylinder 2 and welded by the solder 30. As one of the causes, when there is little solder 30 which joins the cooling pipe 3 to the ice making cylinder 2 and the fillet 31 is not properly formed, it is peeled off by the spiral blade 5 of the auger 4 as shown in FIG. Stress concentration occurs due to the compression load F1 generated when the flaky ice conveyed upward passes through the ice compression passage of the fixed blade 7 and the heat shrinkage F2 caused by the refrigerant flowing inside the cooling pipe 3. It may be easier. Further, between the adjacent cooling pipes 3, a core wire 20 whose cross section protrudes in a mountain shape is embedded to prevent a gap, but the upper end circumference of the uppermost cooling pipe 3 a is joined only by the solder 30. Therefore, the fillet 31 formed of the solder 30 which is not a structural material has low strength. As shown in FIG. 5, when the fillet 31 formed of the solder is cracked, further stress concentration occurs, and the cooling pipe It is conceivable that the possibility that the crack 40 is generated inside the 3 increases.

To summarize the above points, in order to cause pipe cracking in the uppermost cooling pipe 3 wound around the outer periphery of the ice making cylinder 2, it is considered that the following three conditions are satisfied.
i) Radial load due to compressive force at the fixed blade ii) Thermal contraction of copper cooling pipe iii) Stress concentration due to solder shape Here, i) and ii) cause a decrease in ice making capacity of the auger type ice making machine Therefore, it seems that it is most effective to consider countermeasures for iii).

  Accordingly, the present invention has been made to solve the above-described problems of the prior art, and an auger type ice making machine that does not cause pipe cracking in the uppermost cooling pipe wound around the outer periphery of the ice making cylinder is provided. Its main purpose is to provide.

In order to achieve the above-mentioned object, according to the present invention as set forth in claim 1, an auger type ice making machine is provided with an ice making cylinder having a refrigerant evaporation pipe wound around its outer periphery, and is rotatably disposed in the ice making cylinder. And an auger having a spiral blade formed on the outer peripheral surface, and a fixed blade that is fixed inside the upper end of the ice making cylinder, has an ice compression passage, and supports the upper rotating shaft of the auger. It is configured to transport thin ice formed on the inner wall surface of the cylinder while scraping the ice and compress it in the ice compression passage, and further to the outer peripheral surface of the ice making cylinder and the upper periphery of the refrigerant evaporation pipe. A core wire is wound to join the refrigerant evaporation pipe, the core wire, and the ice making cylinder.
It is preferable that a cross section of the core wire protrudes in a mountain shape.

  By using a core wire around the upper end of the uppermost cooling pipe wound around the outer periphery of the ice making cylinder and joining the core wire and the cooling pipe together to the ice making cylinder, a fillet with a constant shape is always formed. Since the fillet is formed of a structural material, the strength of the joint is increased and stress concentration can be prevented.

  Next, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the same reference numerals denote the same or corresponding parts.

  FIG. 1 is a partial cross-sectional front view showing an outline of an auger type ice making machine according to a preferred embodiment of the present invention. In this figure, an auger type ice making machine is provided with an ice making cylinder 2 inside a refrigeration casing 1, and a refrigeration circuit (not shown) is disposed around the ice making cylinder 2 together with a compressor, a condenser, a dryer and an expansion valve. A copper cooling pipe 3 is wound as a refrigerant evaporation pipe of the evaporator that constitutes a). Inside the ice making cylinder 2, an auger 4 having a spiral blade 5 is arranged on the outer periphery, and the auger 4 is configured to be rotated by a gear motor (not shown) through a coupling 6. A fixed blade 7 for compressing flaky ice is disposed inside the ice making cylinder 2 inside the refrigeration casing 1. A supply pipe 8 for supplying ice-making water from an ice-making water tank (not shown) to the inside of the ice-making cylinder 2 is disposed below the freezing casing 1. A heat insulating material 9 is disposed on the outer peripheral portion of the evaporation pipe 3.

  When the ice making operation of the ice making unit configured as described above is started, the ice making water supplied from the ice making water tank to the ice making cylinder 2 via the supply pipe 8 gradually starts freezing from the inner wall surface. Layered thin ice is formed, and the thin ice is transferred upward while being scraped off by the spiral blade 5 of the auger 4. The conveyed flaky ice is compressed by the fixed blade 7 to form chip ice, and is appropriately stored in an ice storage (not shown) or the like.

  Below, the joining structure of the cooling pipe 3 wound around the outer periphery of the ice making cylinder 2 will be described in detail with reference to FIGS. 2 and 3. As shown in FIG. 2, the cooling pipe 3 is wound around the outer peripheral surface of an ice making cylinder 2 made of a copper tube having a surface plated with solder, but the cooling pipe 3 and the ice making cylinder 2 are adjacent to each other. A core wire 20 whose cross section protrudes in a mountain shape is embedded in a gap formed between the outer peripheral surface and the outer peripheral surface.

  On the other hand, around the upper end of the cooling pipe 3a at the uppermost stage related to the joint structure according to the present invention, a core wire 10 having a cross section protruding in a mountain shape is wound between the outer peripheral surface of the ice making cylinder 2 and a structure similar to the core wire 20. It has been turned. Here, the “upper end circumference” of the cooling pipe refers to the upper periphery of the uppermost cooling pipe 3a that is open and does not have an adjacent cooling pipe. The core wire 10 has a structure as shown in FIG. 3. More specifically, the core wire 10 has a flat surface 11 that abuts the outer peripheral surface of the ice making cylinder 2 on one side. Further, a protruding portion 12 having a mountain-shaped cross section is formed on the other side of the core wire 10. The protrusion 12 has two curved concave surfaces 13a and 13b. At least the concave surface 13a facing the outer peripheral surface of the uppermost cooling pipe 3a has a curvature corresponding to the curved outer peripheral surface of the cooling pipe 3a. It is formed to have. The remaining concave surface 13b is configured to form a fillet 31 (see FIG. 2) around the upper end of the uppermost cooling pipe 3a when the cooling pipe 3 and the ice making cylinder 2 are joined.

  In such a combined state, a molten solder 30 is inserted from the outside of the cooling pipe 3 while the ice making cylinder 2 is heated from the inner surface by a heating device such as a heater, thereby cooling the outer peripheral surface of the ice making cylinder 2. The pipe 3 is joined. Since the gap formed between the adjacent cooling pipes 3 and the outer peripheral surface of the ice making cylinder 2 is almost filled with the core wire 20, the solder 30 is connected to the outer peripheral surface of the ice making cylinder 2, the core wire 20, and the cooling pipe 3. It spreads uniformly over a wide range with a slight gap between each other, and is firmly held without forming a void in the solder 30.

  On the other hand, when the cooling pipe 3a, the core wire 10, and the ice making cylinder 2 are joined together by the solder 30 around the upper end of the uppermost cooling pipe 3a, the triangular core wire 10 is present. A constant fillet 31 is always formed around the upper end of 3a. That is, conventionally, since a constant and large fillet 31 can be formed around the upper end of the uppermost cooling pipe 3a, which varies greatly by the operator, the strength increases. Moreover, since the fillet 31 that has been formed with solder is formed with a structural material, the strength is increased from this point of view. By increasing the strength of the joint portion with the ice making cylinder 2 around the upper end of the uppermost cooling pipe 3a, this portion becomes difficult to break, and stress concentration due to cracking can be prevented. As a result, it is possible to avoid “stress concentration due to the shape of the solder”, which is one of the three conditions considered to cause pipe cracking in the uppermost cooling pipe, and does not cause pipe cracking. In addition, since the fillet 31 around the upper end of the uppermost cooling pipe 3a is kept large and constant, the heat exchange area between the cooling pipe 3 and the ice making cylinder 2 is slightly widened, and an increase in ice making capacity is also desired.

  In the above embodiment, the core wire 20 embedded between the adjacent cooling pipes 3 and the core wire 10 disposed around the upper end of the uppermost cooling pipe 3a are separated from each other, but these are the same. It can also be. Thereby, for example, the joint structure of the present application can be easily obtained simply by extending the core wire embedded between the cooling pipes 3 to the upper end circumference of the uppermost cooling pipe 3a.

  Further, if a convex portion is provided on the flat surface 11 on one side of the core wire 10 shown in FIG. 3 and a groove that engages with the convex portion is formed on the outer peripheral surface of the ice making cylinder 2, the ice making cylinder 2 By simply fitting the convex portion of the core wire 10 into the groove on the outer peripheral surface, the core wire 10 can be firmly fixed at a predetermined position, and attachment becomes easy. Furthermore, as shown in FIG. 4, even if a copper wire 15 having a circular cross section is used as the core wire disposed around the upper end of the uppermost cooling pipe 3a, the same effect can be obtained.

  In the above embodiment, the case where the cooling pipe constituting the evaporator wound around the outer periphery of the ice making cylinder is joined using solder is described, but the present invention is not limited to this. For example, even if brazing is performed using a brazing material, it can be similarly fixed.

It is a partially broken front view showing an outline of an auger type ice making machine according to a preferred embodiment of the present invention. It is a partial expanded sectional view which shows the joining structure which concerns on embodiment of this invention. It is an expanded sectional view of the core wire used for FIG. It is a partial expanded sectional view which shows the joining structure which concerns on other embodiment of this invention. It is a partial expanded sectional view which shows the conventional joining structure. It is a partial expanded sectional view which shows the state into which the cooling pipe was cracked by the solder crack in the conventional junction structure. It is a schematic diagram which shows the action direction of the load which arises around a cooling pipe and an ice making cylinder.

Explanation of symbols

1 Refrigeration casing 2 Ice making cylinder 3 Cooling pipe (refrigerant evaporation pipe)
3a Top cooling pipe 4 Auger 5 Spiral blade 6 Coupling 7 Fixed blade 8 Supply pipe 9 Heat insulating material 10 Core wire 11 Flat surface 12 Projection 13 Concave surface 15 Copper wire 30 Solder 31 Fillet

Claims (2)

An ice making cylinder having a refrigerant evaporation tube wound around its outer periphery;
An auger rotatably disposed in the ice making cylinder and having a spiral blade formed on the outer peripheral surface;
A fixed blade that is fixed inside the upper end of the ice making cylinder, has an ice compression passage therethrough, and supports the upper rotary shaft of the auger;
In an auger type ice making machine that makes ice by transporting upward while grinding ice formed on the inner wall surface of the ice making cylinder, and compressing in the ice compression passage,
An auger type ice making machine characterized in that a core wire is wound around an outer peripheral surface of the ice making cylinder and an upper end periphery of the refrigerant evaporation tube, and the refrigerant evaporation tube, the core wire, and the ice making cylinder are joined.   The auger type ice making machine according to claim 1, wherein the core wire has a mountain-like cross section.

Images