JP2694317B2 - Heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a bath kettle, a water heater,
The present invention relates to a heat exchanger used for dishwashers, steamers and the like.

[0002]

2. Description of the Related Art For example, as a conventional heat exchanger for a bathtub, a plurality of copper fin plates having tube insertion holes are arranged in parallel, and a tube using a copper tube is inserted into the tube insertion holes. Then, a tube is drilled in a holding hole above the tube insertion hole, and a welding rod is inserted through the holding hole and penetrated through a plurality of fin plates. And fin plates are assembled by welding the entire circumference with copper brazing.

[0003]

However, for example, a conventional heat exchanger for a bath pot has a problem in corrosion resistance and strength because a copper tube is used as a tube. It is said that the use of a copper tube for a heat exchanger for hot water in food-related equipment is problematic in terms of hygiene, and improvement of these problems has been recently desired. On the other hand, it is possible to solve these problems by replacing the tube with a stainless steel tube. However, when silver brazing a tube of a stainless steel tube and a fin plate made of stainless steel or copper, for example, boric acid, Since it is necessary to perform silver brazing while applying a flux containing a to the outer surface of the tube, continuous automatic brazing cannot be performed in the electric reduction furnace, and it is necessary to perform brazing manually. Silver brazing increases the cost of the product, making it very difficult to put into practical use as a product.

Therefore, according to the present invention, although the desired material can be selected for the tube and the fin plate, it is possible to select brazing which has good workability and is inexpensive, so that the tube and the fin plate can be easily welded. The purpose is to provide a heat exchanger that can be operated.

[0005]

[MEANS FOR SOLVING THE PROBLEMS] To achieve the above object
On the outer surface of the stainless steel pipe with copper plating
Fin plate made of copper or copper plated
Insert it into the tube insertion hole made in
Copper brazing between the fin plate tube insertion holes
Using a thing characterized by being welded and assembled
It is.

Further, due to the effects described later, stainless steel
Tubes with copper plating on the outer surface are separated and parallel
Placed in the vicinity of the support tube that is continuous with the tube insertion hole.
Copper or copper plated with holding holes to support the welding rod
Exterior of multiple fin plates that have been treated in parallel,
Between this tube and the tube insertion hole of the fin plate
It is also characterized by being assembled by welding with copper brazing
Is preferred.

Particularly, a part of the holding hole of the fin plate is supported.
It is preferable that it is provided over the cantilever.

[0008]

As described above, the heat exchange according to claim 1 of the present invention.
If a stainless steel pipe is used, the outer surface of the stainless steel pipe will be plated with copper.
Treated tube and copper or copper plated
Fin plate is easily assembled by copper brazing
You can do it.

Further, when the heat exchanger according to claim 2 is used,
If the outer surface of the stainless steel pipe is copper-plated,
The tubes are spaced apart and arranged in parallel, and the support tube is
Fitted copper plate or copper plated fin plate
Are installed in parallel and the welding rod is installed in the holding hole of the fin plate.
Insert it, put it in the electric reduction furnace and heat the whole,
The outer surface of the tube and the copper that have been plated with copper by melting the contact rod
Fin plate support tube made of or plated with copper
The gap between the inner surface and the inner surface of the copper
Brazing is performed and the fin plate is attached to the tube.
Can be fixed and the whole heat exchanger can be assembled
It is.

When the heat exchanger according to claim 3 is used,
If the welding rod supported by the holding hole melts,
Through the holding hole provided, it flows into the entire inner surface of the support cylinder.
Brazing is performed.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is an explanatory sectional view showing an essential part of a bathtub using a heat exchanger of a representative embodiment, and FIGS. 2 to 6 are related to description of a heat exchanger of a representative embodiment.

As shown in FIG. 1, in the bath cauldron A, the cauldron body 1 has a double structure of an inner case 1a and an outer case 1b, the inlet tube 2 and the outlet tube 3 are connected to the bathtub, and the main body 1 Inner body 1a
The heat exchanger B is attached to the inside of the bath, and the heat in the bath is circulated and warmed by heating the entire heat exchanger B by the thermal power of the burner from below.

In the heat exchanger B, as shown in FIGS. 3 and 4, the tubes 4 are spaced apart from each other and arranged in parallel, and a fin plate 6 having a plurality of tube insertion holes 5 is externally arranged in parallel.
The tube 4 and the fin plate 6 are assembled by brazing and welding the entire circumference.

The tube 4 is molded by immersing the stainless steel pipe 7 in both ends with caps closed and immersing it in a copper plating tank for copper plating, and then removing the caps at both ends. As in No. 2, only the outer surface of the stainless steel pipe 7 is subjected to copper plating 8 treatment.

The fin plate 6 has a tube insertion hole 5 which is slightly larger than the outer diameter of the tube 4 in the plate body 9.
The support cylinder 10 having the
Holding hole 1 for supporting (generally called brazing material)
2 is formed at the upper end of the tube insertion hole 5 and, for example, a stainless steel plate or the like, which is subjected to copper plating 8 treatment on the entire surface including the inner surface of the support cylinder 10, is used. It should be noted that the fin plate 6 may simply use a copper plate, and the use of a copper plate is superior in heat transfer and can be provided at a low cost. Further, in the illustrated fin plate 6,
As shown in FIG. 6, when the holding hole 12 is formed in the plate body 9, the lower end of the holding hole 12 is part of the support cylinder 10.
It is provided so as to extend over a. Therefore, when the welding rod 11 is melted, it flows into the entire inner surface of the support cylinder 10 through the holding hole 10a provided in a part of the support cylinder 10 for brazing, so that the fin plate 6 is reliably welded to the tube 4. Is done.

Then, as shown in FIG. 5 (a), the tubes 4 are inserted into the tube insertion holes 5 so that the plurality of fin plates 6 are spaced apart and arranged in parallel. 4 is expanded to set the gap between the inner surface of the support cylinder 10 and the tube 4 to about 0.025 to 0.1 mm, and then the welding rod 11 for copper brazing is further inserted into the holding hole 12 ... When placed in a reduction furnace and heated, FIG.
As described above, the welding rod 11 is melted to form a gap 13 between the outer surface of the tube 4 on which only the outer surface of the stainless steel pipe 7 has been copper-plated 8 and the inner surface of the support cylinder 10 of the fin plate 6 that has been copper-plated 8 on a stainless steel plate. Copper brazing 11a is performed over the entire circumference by utilizing the capillary phenomenon, and the fin plate 6 is fixed to the tubes 4 ... As shown in FIGS. 3 and 4, so that the entire heat exchanger B can be assembled. You can do it. That is, copper brazing can be performed only by performing copper plating on the outer surface of the tube 4 and copper plating on the surface of the fin plate 6, or by using the fin plate 6 made of copper.

In the heat exchanger A described above, the outer surface of the stainless steel pipe or the stainless steel plate is plated, but it is possible to use various metals according to the application, and the surface is plated. It is also possible to weld by silver brazing using silver plating.Otherwise, by using brass brazing, nickel silver brazing, gold brazing, etc. and performing a plating treatment according to it, various different metals It is possible to easily perform brazing, or brazing metal to metal, which has not heretofore been easily possible. It is also possible to perform brazing by plating only one of the tube 4 and the fin plate 6.

In the heat exchanger A described above, the bathtub A
Although it is described using the case of using as an example, it is not particularly limited, and it can be used for a heat exchanger for a water heater, a dishwasher, a steamer, or a heat exchanger in various fields. In addition, by using the technique described above, various metals can be joined without being limited to the heat exchanger.

As described above, according to the heat exchanger A, as the tube 4, a stainless steel tube 7 whose outer surface is copper-plated 8 is used, and as the fin plate 6, a stainless steel plate or the like is copper-plated 8. Since it is not necessary to perform brazing while applying the flux to the outer surface of the tube 4 by using the material, it is possible to easily weld and assemble the tube 4 by simply putting it in an electric reduction furnace and heating the whole. So with these new methods,
It becomes possible to use a stainless steel tube 7 for the tube 4 of the heat exchanger A in the bathtub A, which is superior in strength to the tube 4 that uses a conventional copper tube and also significantly in hygiene. It can be improved, and depending on the fluid inside, it also has excellent corrosion resistance.

[0020]

The present invention is constructed as described above.
Therefore, the following effects can be obtained. Heat exchange according to claim 1.
According to the converter, the copper-plated stainless steel pipe
For example, a tube made of copper or copper-plated
Of stainless steel fin plate with copper instead of silver brazing
Since it can be welded by brazing, flux
It is easy to braze without applying it to the outer surface of the tube.
In addition to being able to reduce the price
It is. For example, replace the copper tube in the heat exchanger of a conventional bath kettle with
Therefore, since stainless steel pipe can be used,
It will be excellent and will be greatly improved in hygiene.
It has excellent corrosion resistance depending on the internal fluid.
It becomes a thing.

According to the heat exchanger of claim 2, the stainless steel
Separate the tubes with copper plating on the outer surface of the steel pipe.
The tubes are arranged in parallel, and the tube is made of copper or
Fin plate plated with copper is packaged in parallel
Insert the welding rod into the holding hole of the fin plate, and
When it is put into the original furnace and the whole is heated, the welding rod melts and copper
The outer surface of the plated tube and copper or copper mesh
In the gap between the inner surface of the support cylinder and the fin plate that has been treated
Copper brazing is performed over the entire circumference using the capillary phenomenon
The fin plate is fixed to the tube,
The entire exchanger can be assembled.

According to the heat exchanger of claim 3, the holding hole is provided.
When the welding rod supported by the
Through the hole, it flows into the entire inner surface of the support tube and brazing is performed.
The fin plate against the tube
It is welded.

[Brief description of the drawings]

FIG. 1 is an explanatory cross-sectional view showing a main part of a bath cooker using a heat exchanger of a representative embodiment.

FIG. 2 is a conceptual explanatory view showing a disassembled state of the heat exchanger before assembly.

FIG. 3 is a plan view of a heat exchanger.

FIG. 4 is a front view of the heat exchanger.

FIG. 5A is a longitudinal sectional view showing a main part of the heat exchanger before brazing, and FIG. 5B is a longitudinal sectional view showing a main part of the heat exchanger after brazing.

FIG. 6 is an enlarged sectional view of a main part showing a positional relationship between a tube and a fin plate.

[Explanation of symbols]

 A bath kettle B heat exchanger 1 kettle body 2 inlet pipe 3 outlet pipe 4 tube 5 tube insertion hole 6 fin plate 7 stainless steel pipe 8 copper plating 9 plate body 10 support cylinder 11 welding rod 12 holding hole 13 gap

Claims (3)

(57) [Claims] 1. A copper plating treatment is applied to the outer surface of a stainless steel pipe.
The tubing made of copper is treated with copper or plated with copper.
Insert it into the tube insertion hole made in the
Insert a copper filter between the tube and the tube insertion hole of the fin plate.
Heat exchange characterized by being assembled by welding by brazing
vessel. 2. The outer surface of the stainless steel pipe is plated with copper.
Place the separated tubes in parallel and place them in the tube insertion holes.
A holding hole for supporting the welding rod is provided near the continuous support tube.
Fin plate with perforated copper or copper plated
A plurality of parallel outer panels, and tubes and fin plates
Is characterized by being assembled by welding with copper brazing
Heat exchanger. 3. A part of the holding hole of the fin plate is a support cylinder.
The heat exchanger according to claim 2, which is provided over.