JP3839610B2 - Piping method of resin pipe for ice production - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a method for piping a resin tube used as a heat transfer tube for ice production.
[0002]
[Prior art]
Recently, in a manufacturing process of ice, as a heat transfer tube, a resin tube a bent in a zigzag shape as shown in FIG. 1 is used.
[0003]
[Problems to be solved by the invention]
In the ice manufacturing process, the heat transfer tube through which the refrigerant passes tends to be deformed by the pressure at which the surrounding water solidifies, and if deformed, the resistance in the tube increases and the flow of the refrigerant deteriorates. Resin pipes have advantages such as greater resilience when deformed compared to metal pipes, the ability to bend a single pipe, and relatively easy to bend. In order to cope with the latter point, the resin shown in FIG. 1 has a difficulty in that it is easily deformed by the pressure when water is solidified, and heat conduction is poor, and it is necessary to arrange resin pipes closely. If the pitch p of the tube a is made small and densely arranged, the radius of curvature r at the bent portions b at both ends must be reduced. However, the smaller the radius of curvature r at the bent portions b, The pipe is deformed flat, the resistance in the pipe is increased, and the refrigerant flow is further deteriorated in combination with the deformation due to the expansion of ice. Forming a bent portion with a small radius of curvature tends to buckle.
[0004]
An object of the present invention is to solve the above-mentioned problem caused by using a resin pipe as a heat transfer pipe, and to provide a piping method for a resin pipe for ice production.
[0005]
[Means for solving problems]
The invention according to claim 1 is a method of piping a resin tube used as a heat transfer tube for heat exchange, wherein the resin tube is formed in a zigzag with a constant width at a pitch P and then folded, and the distance d between the resin tube adjacent to one side is d. Is repeated at least once a plurality of times so that the bent portion is overlapped with the pitch P so that the pitch P becomes 1/2 to 1/4 pitch P, and the interval between the resin pipes is 1/2 to 1 / It is formed so as to be 4P .
[0006]
When the resin tube is bent in a spiral shape, the bent portion at one end can have a large radius of curvature, the bent portion at the other end has a small radius of curvature, and the bent portion with a small radius of curvature has a flat tube. Thus, there is a problem that the pressure loss increases, and the temperature of the refrigerant or the heat medium is different between the inlet side before heat exchange and the outlet side after heat exchange, resulting in uneven temperature distribution.
[0007]
On the other hand, according to the piping method of the first aspect of the invention, it is possible to make the temperature distribution uniform by increasing the radius of curvature of the bent portions at both ends, and forming a constant width in a zigzag and turning it back.
[0008]
The invention according to claim 2 relates to another piping method of the resin pipe. In the invention according to claim 1, the bent portion has a radius of curvature larger than the pitch of the resin pipe and is inflated. And
[0009]
According to the piping method of the said invention, the curvature radius of a bending part can be made still larger than the pitch of a resin pipe.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
2, as shown in FIG. 3, the curvature radius R of the bent portion 2 of the resin tube 1 zigzag as shown in FIG. 3 is the same as the radius of curvature r of the bent portion b of the resin tube a bent zigzag shown in FIG. 1. After forming a constant width L at the pitch P, it is folded and formed so that the bent portions are shifted and overlapped at the same pitch P so that the distance d between the resin pipes adjacent to one side becomes 1 / 3P, and reaches the start end. (Fig. 4), it is formed so that the distance d between the resin pipes on both sides is 1 / 3P, and the overlap of the resin pipes 1 at the bent part 2 is two. And the end are connected to headers 3 and 4 which are arranged in a vertical direction (a direction perpendicular to the paper surface) with a certain interval. In FIG. 2, the arrows indicate the flow direction of the refrigerant or the heat medium flowing through the resin tube 1.
[0011]
As shown in FIG. 5, each header 3, 4 has resin pipe connection ports 5 at regular intervals in the vertical direction, and each connection port 5 is bent into a zigzag manner as described above. Alternatively, the terminal ends are connected to each other, and resin tubes bent in a zigzag are stacked in multiple stages.
[0012]
FIG. 6 shows another example of the resin pipe bent into a zigzag. As shown in FIG. 2, the interval d of the resin pipe is 1 / 3P, and the radius of curvature of the bent portion is R. In the resin pipe, the radius of curvature of the bent portion is set to R ′ larger than R so that the bent portions are in contact with each other and do not overlap. According to each said embodiment, the overlap of the resin tubes in a bending part will be two, and overlap can be minimized and bulkiness can be decreased.
According to each said embodiment, the overlap of the resin tubes in a bending part will be two, and overlap can be minimized and bulkiness can be decreased.
[0013]
【The invention's effect】
According to the present invention, a resin tube is formed in a zigzag with a certain width and then folded to increase the radius of curvature of the bent portions at both ends, thereby reducing the pitch of adjacent tubes and arranging them closely with the tube. Besides, the flat part can be reduced, the pressure loss can be reduced, and the temperature distribution can be made uniform. Further, as in the second aspect of the invention, if the bent portion is enlarged to have a large diameter and is formed so as to be displaced and overlapped with each other, the pitch of adjacent tubes can be made smaller and the tubes can be arranged densely. .
[Brief description of the drawings]
FIG. 1 is a view showing a conventional resin tube bent in a zigzag.
FIG. 2 is a schematic plan view of a resin pipe according to the present invention.
3 is a schematic plan view showing a process of forming the resin pipe shown in FIG.
4 is a schematic plan view showing another process of forming the resin pipe shown in FIG.
FIG. 5 is a schematic view of a resin pipe connected to a header.
FIG. 6 is a schematic plan view of another resin pipe according to the present invention.
[Explanation of symbols]
1 ・ ・ Resin pipe 2 ・ ・ Bent part 3 ・ 4 ・ ・ Header 5 ・ ・ Connection

Claims (2)

A resin pipe is used as a heat transfer pipe for heat exchange. The resin pipe is formed in a zigzag pattern with a constant width P and then folded back so that the distance d between adjacent resin pipes is 1/2 to 1/4 P. It is formed so that the interval between the resin pipes is ½ to ¼ P by repeating the folding operation so that the bent portions are shifted and overlapped with each other at a pitch P so that Piping method. 2. The method of piping a resin pipe for heat transfer pipe according to claim 1, wherein the bent portion has a radius of curvature larger than the pitch of the resin pipe.

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