JP3738073B2 - Method for manufacturing ice machine cooler - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing an ice making machine cooler.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a method for manufacturing an ice making machine cooler includes a dipping process in which an evaporation pipe is fixed to an ice making chamber, as described in, for example, Japanese Patent Laid-Open No. 2-154911 (F25C1 / 22). Yes. In order to prevent the tin in the plating tank from entering the inside of the evaporation pipe during the dipping process, the copper caps are put on both ends of the evaporation pipe in advance and brazed with copper before the dipping process. Yes. And after a dipping process, this brazing part is heated and the cap is removed from the evaporation pipe. Thereafter, the refrigerant pipes are brazed with silver brazing at both ends of the evaporation pipe from which the cap has been removed. In this brazing, a chlorine-based flux is used.
[0003]
[Problems to be solved by the invention]
By the way, tin plating is performed on the cap and the evaporation tube by dipping treatment, and tin plating is also formed on the surface of the coupling portion between the cap and the evaporation tube and the periphery thereof. Thereafter, the coupling portion is heated to remove the cap, but at this time, the coupling portion and the vicinity thereof become high temperature. Then, tin melts and reacts with the copper tube of the evaporation tube to produce an alloy. This alloy has a low melting point, droops, and the thickness of the copper tube of the evaporation tube gradually decreases, and the strength of the evaporation tube may decrease, or the evaporation tube may be perforated.
[0004]
In addition, after removing the cap, the refrigerant pipe made of copper pipe is brazed to both ends of the evaporation pipe, but tin at the time of dipping also adheres to the surface of the evaporation pipe at the portion where the refrigerant pipe is joined. Therefore, if flux is not used, the wax will not fit into the copper evaporation tube. Therefore, flux is used, but if this chlorine-based flux is left attached to the evaporation pipe or refrigerant pipe, the copper evaporation pipe or refrigerant pipe rusts and generates patina, which is extremely problematic for food hygiene, It cannot be used for an ice maker that produces drink ice. Therefore, after brazing, it is necessary to polish off this flux with a brush or the like. This work is very labor intensive and time consuming.
[0005]
As another method, there is a method of cutting and removing the cap without heating the coupling portion when removing the cap. However, cutting and detaching only the cap without damaging the evaporation tube requires skill and time.
[0006]
The present invention is intended to solve the above-described problems. An ice making machine cooler capable of brazing refrigerant piping to an evaporation pipe without damaging the evaporation pipe and without using a flux. An object is to provide a manufacturing method.
[0007]
[Means for Solving the Problems]
The manufacturing method of the cooler for an ice making machine of the present invention includes the following first to eighth steps. In these steps, an ice making chamber (6) having an open bottom surface and an evaporation tube made of a copper tube. (1) is combined to manufacture a cooler for ice making machines.
a. A first step of covering the both ends of the evaporation tube with a copper cap (2).
b. A second step of brazing the cap to the evaporation tube with copper brazing (2a).
c. A third step of covering the brazed portion and its periphery with heat-resistant tape (4).
d. A fourth step of fixing the evaporation tube to the upper surface of the ice making chamber.
e. A fifth step of dipping the ice making chamber to which the evaporation pipe is fixed after the steps from the first step to the fourth step are completed.
f. A sixth step of removing the heat-resistant tape from the evaporation tube after the dipping process is completed.
g. After the sixth step, the seventh step of heating the brazed portion and removing the cap from the evaporation tube.
h. Eighth step of brazing the copper refrigerant pipe (9) with copper brazing (9a) to both ends of the evaporation pipe with the cap removed.
[0008]
The heat-resistant tape may be a polytetrafluoroethylene tape.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of a method for manufacturing an ice making machine cooler according to the present invention will be described with reference to FIGS. FIG. 1 is a process diagram for explaining a process of a method for manufacturing an ice making machine cooler according to the present invention. FIG. 2 is a process diagram for explaining a process subsequent to FIG.
[0010]
FIG. 1A shows an end portion of an evaporation tube 1 made of a copper tube. As shown in FIG. 1B, the both ends of the evaporation tube 1 are covered with a copper cap 2 to be closed (first step). Then, the end of the cap 2 is brazed to the evaporator tube 1 with a copper braze 2a (second step). Next, as shown in FIG. 1C, the heat-resistant tape 4 made of polytetrafluoroethylene such as Teflon (registered trademark), which is an adhesive tape, is wrapped around and covered with the brazed portion and its periphery (third step). . In this way, caps 2 are attached to both ends of the evaporation tube 1.
[0011]
In FIG. 1 (d), the evaporator tube 1 is fixed by spot welding with an upper surface of an ice making chamber 6 made of a metal such as copper with a copper braze or the like (fourth step). The ice making chamber 6 has an open bottom surface and is partitioned in a vertical and horizontal manner, and a large number of ice making chambers 6a having an open bottom surface are formed.
[0012]
The ice making chamber 6 to which the evaporator tube 1 is fixed is dipped in a plating tank 8 containing tin as a main component (fifth step). Then, the evaporation pipe 1 and the ice making chamber 6 are tin-plated to improve the corrosion resistance, and the gap between the contact portions between the evaporation pipe 1 and the ice making chamber 6 is filled with tin, heat conduction is improved, and a copper evaporation pipe is provided. 1 and the ice making chamber 6 can be prevented from rusting and generating patina. Further, during the dipping process, the air inside the evaporation tube 1 is heated and expands. Since both ends of the evaporation tube 1 are closed by the cap 2, the pressure of the air expanded inside the evaporation tube 1 is applied to the cap 2. Since the cap 2 is brazed with the copper braze 2a, the pressure of the air is supported by the brazed portion of the copper braze 2a, and no force is applied to the heat-resistant tape 4, so that the heat-resistant tape 4 comes off. Can be prevented.
[0013]
Then, the heat-resistant tape 4 is peeled off from the evaporation tube 1 after the dipping process (sixth step). Next, the brazed portion between the cap 2 and the evaporation tube 1 is heated to remove the cap 2 from the evaporation tube 1 (seventh step). Then, the state illustrated in FIG. In FIG. 2 (e), the hatched portion 1a is covered with a cap 2 or heat-resistant tape 4 during dipping, and is not tin-plated. Is exposed.
[0014]
In FIG. 2 (f), a refrigerant pipe 9 made of copper pipe is connected to the evaporation pipe 1 and brazed with a copper braze 9a (eighth step). By the way, as mentioned above, since the copper cloth is exposed at both ends of the evaporation pipe 1, when brazing the evaporation pipe 1 and the refrigerant pipe 9 made of copper pipe, do not use a flux. It can be brazed with a copper braze 9a.
[0015]
Although the copper cloth is exposed at the connecting portion between the evaporation pipe 1 and the refrigerant pipe 9, the exposed portion is subjected to rust prevention treatment such as plating or painting.
[0016]
As described above, in the embodiment, since the heat-resistant tape 4 covers the portion where the evaporator tube 1 and the cap 2 are brazed and the periphery thereof, the heat-resistant tape 4 is used during the dipping process. Tin does not adhere to the brazed part and its surroundings that were covered with. Therefore, when the cap 2 is removed, even if the brazed portion is heated, tin does not exist in the vicinity thereof, so that this heating does not cause tin to react with copper to produce an alloy. As a result, it is possible to prevent the strength of the evaporation tube 1 from being reduced or the evaporation tube 1 from being perforated. The range in which the heat-resistant tape 4 is wound is the brazed portion and its periphery, that is, both ends of the evaporation tube 1. In this way, the range in which the heat-resistant tape 4 is wound is such that when tin adheres, when the brazed portion is heated and the cap 2 is removed, the tin melts by this heating and the copper cloth of the evaporation tube 1 It is a range in which the strength of the evaporator tube 1 may deteriorate due to reaction.
[0017]
Further, the heat-resistant member covering the brazed portion is not a special shape such as a cap, but is a strip-shaped tape. Since this heat-resistant tape has general versatility and is commercially available, it can be obtained at low cost and the cost can be reduced.
[0018]
Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the gist of the present invention described in the claims. Can be done. Examples of modifications of the present invention are illustrated below.
(1) The steps described in claim 1 are not necessarily performed in order. For example, the fourth step can be performed before the first step, between the first step and the second step, or between the second step and the third step.
[0019]
(2) The heat-resistant tape does not necessarily need to be made of polytetrafluoroethylene. And this heat-resistant tape should just be able to endure the heat at the time of a dipping process. That is, since the dipping process time is short, any heat-resistant tape that can withstand this process time and high heat may be used, and it is not always necessary to withstand high heat for a long time. The tape made of polytetrafluoroethylene has good heat resistance and is extremely suitable for the method of manufacturing the ice making machine cooler.
[0020]
(3) In the embodiment, the heat-resistant tape is an adhesive tape. However, as long as the brazed portion and its periphery can be covered, the heat-resistant tape is not necessarily an adhesive tape. It is also possible to fix to. A heat-resistant tape having a pressure-sensitive adhesive layer formed on one side is commercially available, is inexpensive, and is easy to install.
[0021]
【The invention's effect】
According to the present invention, since the brazed portion and its periphery are covered with the heat-resistant tape, tin does not adhere to the vicinity of the brazed portion of the evaporation tube during the dipping process. Therefore, when the brazed part is heated to remove the cap, tin does not melt and react with the copper tube of the evaporation tube to prevent the formation of an alloy, thereby preventing the strength of the evaporation tube from deteriorating. Can do.
[0022]
In addition, since the brazed portion is heated to remove the cap from the evaporation tube, the cap can be easily removed without damaging the evaporation tube.
[0023]
Furthermore, when connecting the refrigerant pipe to the evaporation pipe, tin does not adhere to the end of the evaporation pipe. Therefore, it is possible to braze the refrigerant pipe and the evaporation pipe with copper brazing without using a flux. it can. Therefore, there is no work to remove the flux after brazing, and the installation work becomes easy.
[0024]
Furthermore, when the heat-resistant tape is a polytetrafluoroethylene tape, the polytetrafluoroethylene tape has good heat resistance and does not deform or melt during dipping. Therefore, the dipping process and the removal work of the heat-resistant tape can be performed smoothly.
[Brief description of the drawings]
FIG. 1 is a process diagram for explaining the steps of a method for manufacturing an ice making machine cooler according to the present invention.
FIG. 2 is a process diagram for explaining a process subsequent to FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Evaporation pipe 2 Cap 2a Copper brazing 4 Heat-resistant tape 6 Ice making chamber 9 Refrigerant piping 9a Copper brazing

Claims (2)

In the manufacturing method of the cooler for ice making machine manufactured by combining the ice making chamber whose lower surface is opened and the evaporation pipe made of a copper pipe,
A first step of covering both ends of the evaporation pipe with a copper cap;
A second step of brazing the cap to the evaporation tube with copper brazing;
A third step of covering the brazed portion and its periphery with heat-resistant tape;
A fourth step of fixing the evaporation tube to the upper surface of the ice making chamber;
A fifth step of dipping the ice making chamber to which the evaporation pipe is fixed after the steps from the first step to the fourth step are completed;
After the dipping process is finished, a sixth step of peeling the heat-resistant tape from the evaporation tube,
After the sixth step, the seventh step of heating the brazed part and removing the cap from the evaporation tube;
A method for manufacturing a cooler for an ice making machine, comprising an eighth step of brazing a copper refrigerant pipe to both ends of the evaporation pipe with the cap removed. The method for manufacturing a cooler for an ice making machine according to claim 1, wherein the heat-resistant tape is a polytetrafluoroethylene tape.

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