JPS5923893B2 - Cooler manufacturing method - Google Patents

Description

[Detailed description of the invention] The present invention relates to an improvement in a method for manufacturing a cooler.

Regarding the manufacture of so-called pipe-on-sheet type coolers in which a cooling pipe is bonded to a cooling plate, conventionally, a cooling pipe bent in a serpentine shape is bonded to a flat cooling plate, and then the cooling plate is arbitrarily attached. A method of bending into the shape of is used.

In such a method of manufacturing a cooler, in order to prevent the cooling pipe from collapsing due to bending, the bending diameter must be made large to some extent, and therefore the interval between folds of the cooling pipe also becomes large. It ends up.
However, even if the bending diameter of the cooling pipe is set to a minimum of 1 wave without causing collapse, the total length of the bondable cooling pipe that controls the cooling capacity is insufficient.
. Therefore, a cooling plate with a small surface area has the disadvantage that only a cooler with a small cooling capacity can be obtained, and there is also the disadvantage that a defrosting heater must be separately installed. For this reason, various proposals have been made to overcome the above-mentioned drawbacks in cooler manufacturing.
The items indicated in the number are listed.

What is shown here is a cooling plate in which a defrost heater is glued to a roll-formed straight cooling pipe, and after this is glued, an adhesive is applied to the cooling pipe and the cooling plate is bent into a box shape. The cooling pipe is wound at a predetermined pitch and bonded. According to this manufacturing method, by changing the winding pitch of the cooling pipe, a cooler having a desired cooling capacity can be obtained regardless of the surface area of the cooling plate. However, the drawback is that various complicated and complicated processes must be performed, such as the roll forming process for cooling pipes, the adhesive application and heating curing process for bonding defrosting heaters, and the adhesive coating and drying process for bonding cooling pipes. In addition, since the defrosting heater is glued to the top surface of the cooling pipe, the thermal conductivity of the defrosting heater is poor, and the cooling plate around which the cooling pipe is wound is box-shaped and has a small radius. In addition, since there is a straight line between the R parts, there are various drawbacks such as difficulty in bringing the cooling plate and cooling pipe into close contact with each other. The present invention was devised to solve the above-mentioned conventional drawbacks, and includes:
It is an object of the present invention to provide a method for manufacturing a cooler that can properly manufacture a cooler having a desired cooling capacity through simpler steps than conventional methods.

Therefore, in the present invention, an adhesive layer is formed by applying a film adhesive to the outer surface of a cooling plate that has been previously formed into a cylindrical shape, and this cooling plate is extruded with a space for a defrosting heater. The basic feature is that the cylindrical cooling plate is molded into a box shape after the molded cooling pipe is wrapped around it and the adhesive layer is heated and cured.

Next, an embodiment of the method for manufacturing a cooler according to the present invention will be described in detail based on the drawings.

FIG. 1 shows an outline of the manufacturing method according to the present invention, in which the cooling pipe 1 has two parts as shown in FIGS. 6 to 8.
It has a hole structure and is extruded to have a refrigerant passage A1 and a defrosting heater space B through a partition wall E. After extrusion, it is formed into a coil 2 and can be continuously supplied from the coil 2. It's becoming like that.

On the other hand, a cylindrical cooling plate 3 is manufactured by cutting an aluminum plate coated with paint etc. on one side to a certain length, with the painted side facing inside, and combining both cut ends. , an adhesive layer is formed by applying a film adhesive 4.

Then, the cooling pipe 1 is wrapped around the outer surface of the cooling plate 3 via this adhesive layer. For this purpose, for example, a device as shown in FIG. 2 is used. That is, in the figure, 5 is a rotatable expansion drum, and 6 is a rotatable expansion drum.
7 is a threaded guide shaft provided parallel to the axis of the expansion drum 5; 7 is a pitch maker screwed onto the guide shaft 6 through its female threaded hole; has an insertion hole 71 through which the cooling pipe 1 is inserted, and can be moved along the guide shaft 6 by rotating the threaded guide shaft 6. Therefore, in order to wind the cooling pipe 1 around the cooling plate 3 using such a device, the cylindrical cooling plate 3 is first set on the expansion drum 5, and the cooling pipe 1 drawn out from the coil 2 is wound around the cooling plate 3. After inserting it into the insertion hole 71 of the pitch maker 7, its end is fixed near one end of the cooling plate 3 by caulking 14 or the like, and in this state, the expansion drum 5 and the guide shaft 6 are In this way, the pitch maker 7 into which the cooling pipe 1 is inserted moves at a constant speed on the guide shaft 6 parallel to the axis of the expansion drum 5, and the cooling pipe 1 As the punchion drum 5 rotates,
It is wound spirally around the outer surface of the cooling plate 3 and is bonded to a film adhesive on the outer surface of the cooling plate 3. Then, the cooling pipe 1 is wound up to the other end of the cooling plate 3, and the end of the winding is fixed onto the cooling plate 3 by caulking 14 or the like, and then the cutter 8 (not shown in FIG. 2) According to the expansion
The cooling pipe 1 is cut between the drum 5 and the pitch maker 7, and the cooling plate 3 itself is removed from the expansion drum 5 as shown in FIG. Then, this is heated in a heating oven 9 to harden the film adhesive 4. A suitable method for carrying out this step is to install a heating furnace on the conveyance line and pass each cooling plate 3 through the heating furnace as shown in FIG. Next, after the adhesive has hardened, the cylindrical cooling plate 3 is molded into a box shape, and for example, a box forming machine 10 shown in FIG. 4 is used in this box forming process.

That is, this box forming machine 10 includes four padded holding plates 12 arranged in a square shape on a base 11, and the holding plates 1.
It is composed of four vertical rollers 13 provided corresponding to each inner corner of a rectangular shape constituted by 2,
The holding plate 12 can be moved inward of the base 11, and the vertical roller 13 can be moved in the diagonal direction of the square shape. Therefore, in order to form a box using such an apparatus, the cylindrical cooling plate 3 is inserted into the gap between the holding plate 12 and the vertical roller 13, and the vertical roller 13 is inserted into the cylindrical hollow part. , and move the holding plate 12 toward the inside of the base 11 and the vertical roller 13 toward the outside of the base 11. In this case, the cylindrical cooling plate 3
is molded into a box shape as shown in FIG.

The cooling pipe 1 is provided with a defrosting heater space B as shown in FIGS. 6 to 8, but in order to install a heater in the defrosting heater space B, the cooling pipe 1 is 1 is wound around the cooling plate 3, and then the heater cord is blown in with compressed air or the like at an appropriate stage and attached.

In addition, the cross-sectional shape shown in FIGS. 6 to 8 has vertical rising portions D and D of a certain length on both sides of the horizontal portion C.
It is characterized by having such vertical rising parts D, D
This makes the bending workability of the pipe body extremely good. Here, if the radius of the R section of cooling pipe 1 is (r), then the length of the vertically rising part (x)
The length (y) from the center point of the R section on the refrigerant passage A side to the partition wall E between the refrigerant passage A and the defrosting heater space B shall be the following value or a value approximated thereto. It is preferable. Further, the defrosting heater space B can have an appropriate shape as shown in FIGS. 6 to 8. According to the present invention as described above, the cooling pipe 1 wound around the cooling plate 3 is provided with a defrosting heater space B, and a heater cord is blown into this space by compressed air or the like. There is no need to separately attach the heater cord to the cooling pipe 1 or the cooling cord 3 using adhesive or the like. Also, when winding the cooling pipe 1, do not attach the heater cord to the expansion drum 5. By appropriately selecting the rotational speed and the moving speed of the pitch maker 7 that moves according to the rotation of the guide shaft 6, the cooling pipe 1 can be wound around the cooling plate 3 at a desired pitch. A desired cooling capacity can be obtained by adjusting the winding pitch.

According to the method for manufacturing a cooler of the present invention as described above, an adhesive layer is formed by applying a film-like adhesive 4 to the outer surface of the cooling plate 3 which has been previously formed into a cylindrical shape,
The extruded cooling pipe 1 with the defrosting heater space B is wrapped around the cooling plate 3, and after the adhesive layer is heated and hardened, the cylindrical cooling plate 3 is molded into a box shape. Not only is it possible to obtain the desired cooling capacity regardless of the size of the surface area of the cooling plate, but it is also possible to improve the forming process for obtaining cooling pipes by roll-forming a round tube into a semicircle, which was conventionally done. This eliminates the need for a separate adhesive application and heating curing process for attaching a defrosting heater, and the adhesive layer on the cooling plate can be obtained by simply wrapping a film adhesive around the cooling plate. The conventional process of applying adhesive using a coating roll can be omitted, and an adhesive layer of uniform thickness can be formed, and since the adhesive is in the form of a film, drying means are completely unnecessary. In addition, since the cooling plate used when winding the cooling pipe is cylindrical, good adhesion between the cooling plate and the cooling pipe can be obtained, and an appropriate cooler can be manufactured using a simple process. It has an excellent effect.

[Brief explanation of the drawing]

Figure 1 is a schematic explanatory diagram showing the steps of the method for manufacturing a cooler according to the present invention, Figure 2 is an explanatory diagram showing the cooling pipe winding process and the equipment used therein, and Figure 3 is a completed cooling pipe winding process. FIG. 4 is an explanatory diagram showing a box-forming machine, FIG. 5 is an explanatory diagram showing a box-forming cooler, and FIGS. 6 to 8 are cross-sectional views of cooling pipes. FIG. In the figure, 1 is a cooling pipe, 3 is a cooling plate, 4 is a film adhesive, 9 is a heating furnace, and 10 is a box forming machine.

Claims (1)

[Claims] 1. An adhesive layer is formed by applying a film adhesive to the outer surface of a cooling plate that has been previously formed into a cylindrical shape, and an extruded cooling pipe with a space for a defrosting heater is wrapped around this cooling plate. After applying and heating and curing the adhesive layer,
A method for manufacturing a cooler characterized by molding a cylindrical cooling plate into a box shape.