JPH08337866A - Galvannealed cooler and galvanneaing method - Google Patents

Abstract

PURPOSE: To provide a cooler free from any galvanneal refuse by inserting a plurality of cooling tubes which are alternately arranged in parallel to each other into an intermediate support, and securing a part between a cooling fin provided on the cooling tube and the intermediate support at the prescribed space by spacers provided on the upper and lower surfaces of the intermediate support. CONSTITUTION: A plurality of cooling tubes 1 which are alternately arranged in parallel to each other are inserted into an intermediate support 15, and a plurality of spacers 11 are diagonally (at about 30 deg.) arranged between the alternately arranged cooling tubes 1. The spacers 11 are steel plates of 3-5mm in thickness and of 15-20mm in width, and fitted by welding to the intermediate support 15. The space equivalent to the plate thickness of 3-5mm of the spacers 11 is secured between the cooling fins 2 for the cooling tubes 1 and the intermediate support 15, and no hot dip galvannealing refuce is left in the space. The hot dipping time in a hot dipping tank is reduced, and the time for the galvannealing work can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot-dip galvanized cooler for oil-filled electrical equipment such as transformers used in harsh environments.

[0002]

2. Description of the Related Art As a hot-dip galvanizing cooler used in oil-filled electrical equipment such as a transformer, the one shown in FIG. 7 is often used. In FIG. 7, reference numeral 10 denotes a cooler, which includes a cooling pipe 1 in which a plurality of steel pipes having a predetermined length are arranged in parallel, cooling fins 2 provided with cooling pipe insertion holes corresponding to the number of the plurality of cooling pipes 1, and a plurality of cooling pipes. The cooling pipe 1 is composed of a header 3 for concentrating both ends of the cooling pipe 1 into one chamber, a connection port 4 for connecting a pipe to a device body provided in the header 3, and an intermediate support 5 for keeping a constant interval between the cooling pipes 1. There is. 6 is a blind lid, 7 is an exhaust pipe,
It is attached when performing hot dip galvanizing.

FIG. 8 is a partially enlarged view of an enlarged portion A of FIG. As shown in the drawing, the cooling pipe 1 and the holes of the cooling fins 2 are fitted in a clearance, and the intermediate support 5 is in contact with the cooling fins 2. When hot-dip galvanizing is performed, hot-dip zinc penetrates into the gaps and is bonded.

The cooler forms a flux film of zinc chloride (ZnCl2) and ammonium chloride (NH4Cl) on the surface before hot dip galvanizing.
When immersed in a molten zinc bath at 60 to 470 ° C, the molten zinc and the flux film chemically react to activate the cooler surface,
A molten zinc layer is formed on the surface. The flux component chemically reacted with zinc floats on the surface of the zinc melting tank as zinc plating residue. If the gap between the cooling fins 2 and the intermediate support 5 is small, zinc plating residue may remain in the gap. In the cooler shown in FIG. 5, the gap between the intermediate support and the cooling fins is small, and the plating residue is likely to remain, and in order to eliminate this, it is necessary to lengthen the time of immersion in the zinc melting bath.

[0005]

In the conventional cooler, as described above, the gap between the cooling fin and the intermediate support is small,
Since the area is large, it is easy to leave gaps in the plating residue, and it takes a long time to replace zinc with the plating residue, and it takes a long time for the plating work.

The present invention has been made to solve the above problems, and even if the dipping time of the cooler in the hot dip galvanizing bath is short, no plating residue remains in the gap between the intermediate support and the cooling fin. Thus, the working time of hot dip galvanizing of the cooler is shortened.

[0007]

According to a first aspect of the present invention, there is provided a hot dip galvanizing cooler in which spacers are arranged between upper and lower cooling pipes of an intermediate support through which cooling pipes are inserted. is there.

In the hot-dip galvanizing cooler according to a second aspect of the present invention, spacers are obliquely arranged between the upper and lower cooling pipes of the intermediate support in which the cooling pipes are alternately arranged and inserted.

In the hot-dip galvanizing cooler according to the third aspect of the present invention, the spacers arranged on the upper and lower surfaces of the intermediate support are each divided into a plurality of spacers.

In the hot-dip galvanizing method for the hot-dip galvanizing cooler according to the fourth aspect of the present invention, the hot-dip galvanizing is performed with the spacers arranged on the intermediate support in the vertical direction.

[0011]

According to the first aspect of the present invention, since the spacers are arranged between the inserted cooling pipes on the upper and lower surfaces of the intermediate support through which the cooling pipes are inserted, a gap is secured between the intermediate spacers and the cooling fins. At the time of hot dip galvanizing, the plating residue does not remain between the intermediate support and the cooling fin, and the plating time can be shortened.

According to the second aspect of the present invention, the cooling pipes are arranged alternately, and the spacers are arranged obliquely between the cooling pipes on the upper and lower surfaces of the inserted intermediate support. Therefore, the cooling pipes are arranged alternately. In addition, the clearance between the intermediate support and the cooling fin is secured, the plating residue does not remain, and the plating work time can be shortened.

According to the third aspect of the present invention, since the spacers arranged on the upper and lower surfaces of the intermediate support are each divided into a plurality of spacers, the plating dust generated on the surface of the cooler in the molten zinc bath is easily floated.

According to a fourth aspect of the present invention, in the hot-dip galvanizing method for a hot-dip galvanizing cooler, the spacers arranged on the intermediate support are arranged in a vertical direction.
When the hot dip galvanizing is performed, it is easy for the dross to float in the hot dip galvanizing bath, and the breaking of the hot dip zinc when pulling is improved.

[0015]

【Example】

Example 1. FIG. 1 is a configuration diagram of an intermediate support portion of an embodiment of the present invention. Reference numeral 15 is an intermediate support through which the cooling pipe 1 is inserted, and 11 is a spacer. FIG. 2 is a side view of FIG. FIG. 3 shows the arrangement of the plurality of spacers 11 diagonally between the cooling pipes 1 inserted through the intermediate support 15 of FIG. 1 and arranged alternately. Spacer 1
In No. 1, an iron plate having a thickness of 3 to 5 mm and a width of 15 to 20 mm is attached to the intermediate support 15 by welding. Since the cooling pipes are alternately arranged, the spacers 11 are obliquely attached between the cooling pipes by 30 degrees.

By attaching the spacers to the intermediate support 15 in this manner, the cooling fins 2 and the intermediate support 1 are
5 means that a gap corresponding to the plate thickness of the spacer 11 of 3 to 5 mm is secured, and the plating residue in the hot dip galvanizing does not remain in the gap, and the time for dipping in the zinc molten bath is shortened. Time can be shortened.

Example 2. FIG. 4 is a configuration diagram of an intermediate support portion of another embodiment of the present invention. FIG. 5 is a side view of FIG. This example is the same as Example 1. In the case of, the spacers are divided and attached. This has the effect of facilitating the floating of the dross when immersed in the zinc molten bath and improving the breakability of the molten zinc after pulling.

Example 3. Example 3 is an example of a hot dip galvanizing operation. The situation is shown in FIG. In the figure, 20 is a molten zinc tank for storing molten zinc, and 21 is molten zinc. The cooler is so constructed that the spacer is attached in the vertical direction as shown in the drawing and is immersed and pulled up. By moving up and down according to the direction of the spacers in this way, the plating dregs are smoothly floated up, the breakage of the molten zinc after pulling up is improved, and the cooler has a uniform zinc thickness.

[0019]

In the hot-dip galvanizing cooler according to claim 1 of the present invention, the spacers are arranged between the inserted cooling pipes on the upper and lower surfaces of the intermediate support through which the cooling pipes are inserted.
The gap between the intermediate spacer and the cooling fin is secured, and the plating residue does not remain between the intermediate support and the cooling fin during hot dip galvanizing, so that the dipping time in the zinc melting bath is shortened and the plating work time can be shortened. Play.

In the hot-dip galvanizing cooler according to the second aspect of the present invention, the spacers are obliquely arranged while the cooling pipes are arranged on the upper and lower surfaces of the intermediate support in which the cooling pipes are alternately arranged and inserted. , Even if the cooling pipes are alternately arranged, the gap between the intermediate support and the cooling fin is secured, the plating residue does not remain, the immersion time in the zinc melting bath is shortened, and the working time of plating can be shortened. .

In the hot-dip galvanizing cooler according to claim 3 of the present invention, the spacers arranged on the upper and lower surfaces of the intermediate support are each divided into a plurality of spacers, so that the plating residue generated on the cooler surface in the zinc-melting tank floats. Has the effect of becoming easier.

The hot dip galvanizing method for the hot dip galvanizing cooler according to the fourth aspect of the present invention is a method of dipping and pulling up in the zinc hot dip bath with the spacers arranged on the intermediate support being oriented in the vertical direction. The plating residue is easily floated in the zinc melting tank, the broken zinc is easily broken when it is pulled up, and a cooler with a uniform plating thickness and no adhesion of plating residue can be obtained, and plating work time can be shortened. Produce an effect.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an intermediate support portion of an embodiment of a cooler according to the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a partial view showing a configuration of an intermediate support and a cooling fin of FIG.

FIG. 4 is a configuration diagram of an intermediate support portion of another embodiment of the cooler according to the present invention.

FIG. 5 is a side view of FIG. 4;

FIG. 6 is an explanatory view of a hot dip galvanizing state of the cooler according to the present invention.

FIG. 7 is a configuration diagram of a conventional hot dip galvanizing cooler.

FIG. 8 is an enlarged view of part A in FIG.

[Explanation of symbols]

11 spacers, 12 spacers, 15 intermediate supports, 16 intermediate supports, 20 zinc molten bath, 21 molten zinc.

Claims (4)

[Claims] 1. A plurality of cooling pipes are arranged in parallel, a plurality of cooling fins having through holes for the cooling pipes are mounted on the cooling pipes, and the end portions of the cooling pipes are gathered in one chamber and arranged in parallel. Headers connected to the cooling pipe are provided at both ends of the cooling pipe, an intermediate support is provided at an intermediate portion of the cooling pipe, and spacers are arranged between the cooling pipes on the upper and lower surfaces of the intermediate support. Plating cooler. 2. The spacer according to claim 1, wherein spacers are arranged obliquely between the cooling pipes on the upper and lower surfaces of the intermediate support, which are provided in the middle of the cooling pipes arranged alternately. Hot dip galvanizing cooler. 3. The hot dip galvanizing cooler according to claim 1, wherein the spacer is divided into a plurality of rows in each row. 4. A plurality of cooling pipes are arranged in parallel, a plurality of cooling fins provided with through holes for the cooling pipes are attached to the cooling pipes, and the end portions of the cooling pipes are collected in one chamber and arranged in parallel. Headers connected to the cooling pipe are provided at both ends of the cooling pipe, an intermediate support is provided at an intermediate portion of the cooling pipe, and a cooler in which a spacer is arranged between the cooling pipes inserted through the upper and lower surfaces of the intermediate support is A hot dip galvanizing method for a hot dip galvanizing cooler, characterized in that the spacers provided on the intermediate support are vertically oriented so as to be immersed in a zinc hot dip bath and pulled up to perform hot dip galvanizing.