JPH0755377A - Manufacture of high pressure condenser - Google Patents

Abstract

PURPOSE: To provide a condenser which is improved by making it of a light material, and a method for manufacturing the condenser. CONSTITUTION: In a high pressure condenser 20, a plurality of flat tubes 21 are arranged parallel, separated in the lateral direction at an interval, corrugated heat exchange fins 22 is extended between the tubes, and both ends of the tubes are inserted into a header 23. A coating to be deposited by heat is applied on both sides of flat plate materials and a plurality of recesses 25 are brooided at a proper interval. The flat plate materials are worked sequentially to form the tubes 21 in a desired shape. When the tubes are mounted on the header together with the fins 22, the assembly is heated entirely so that internal surfaces of protruding parts (recesses) 25 are mutually welded by the coating on the tubes and the external surfaces of the tubes are welded in slots of the header.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to high voltage thermal capacitors, and more particularly to a method of making such capacitors.

[0002]

2. Description of the Prior Art One of the problems encountered when manufacturing heat exchangers known as condensers, especially high pressure heat exchangers, is that they are used in condensers because of the high pressure of the medium such as the coolant. The wall thickness of the tube must be increased and extruded to provide multiple passages of suitable strength. That is, the tube must be reinforced or its wall thickened.

A commonly used method is to use a plurality of flat extruded tubes having longitudinally extending passageways for coolant, to which headers are joined at both ends and the tubes are provided in a plurality of plates. It is a method of forming a fin by passing it through the.

[0004]

SUMMARY OF THE INVENTION The primary object of the present invention is to provide an improved capacitor made of lightweight material and a new method of making such a capacitor.

According to the present invention, a high voltage capacitor has a plurality of flat tubes arranged laterally spaced in parallel.
In the meantime, wavy heat exchange fins are extended along the length of the tube, and both ends of the tube are inserted into the header. The tube is coated on both sides of a flat plate material to be fused when heat is applied, and is provided with a plurality of recesses or protrusions arranged at intervals in the longitudinal direction and the lateral direction. This is followed by the following steps. The flat plate material is obtained by first rolling the side edge parts on both sides of the plate material to form the side edge parts on both sides in a curved shape having a radius corresponding to the radius of curvature of one rounded side edge part of the completed tube. Rolling the central part of the plate material stepwise to form a curved shape at the side edge part having the other roundness of the finished tube extending in the longitudinal direction, and in the process of feeding the plate material onto a series of rolls, The rounded side edges and the central portion of the plate are utilized to accurately position the center of the plate. After that, the separated free side edge portions of the rolled plate material are heated, and the plate material is passed through a guide disposed immediately upstream of the pair of squeeze rolls so that the free side edge portions on the opposite sides in the lateral direction of the plate material are mutually crossed. To weld.
The protrusions inside the strip are joined before the free side edges of the strips are welded together. When the tube is attached to the header with the fins, the entire assembly is heated to cause the coating on the tube to weld the inner surfaces of the protrusions (recesses) to each other and the outer surface of the tube to the slot in the header where the tube end passes through. Weld to.

[0006]

1 to 6, a high voltage condenser 20 comprises a plurality of flat tubes which are arranged in parallel in a lateral direction with a space between them, and corrugated heat exchange fins 22 are arranged along the length of the tube 21. It is constructed by extending. Tube 21
Both ends of the rod extend into a cylindrical header 23 with end caps 24 through slots having a tube cross section.

[0007] These constituent members have a coating applied to the inner surface and the outer surface thereof to melt and bond when heat is applied. For example, if aluminum material is used, the coating is cladding, and for copper or brass, the coating is solder. The tube 21 has a coating on both the inner and outer surfaces.

As shown in FIGS. 4-6, the tube 21 has a plurality of recesses 25 extending in the longitudinal direction. These recesses project inwardly and contact each other to be fusion bonded by coating on the inner surface at point C. In order to form the tube, the plate material is rolled stepwise, both ends of the tube are brought into contact with each other, and heat is applied to perform fusion bonding at point S. The outer surface of the tube is bonded to the header 23 and fins 22 by coating by applying heat to the assembly.

In the example shown in FIGS. 7-9, the tube 21
a has a flat abutment portion 25a and is joined in the same manner. In the example shown in FIG. 10, the recesses 25b arranged at intervals in the longitudinal direction and the lateral direction are in the shape of a truncated pyramid and are in contact with each other inside the tube. In the case of the tube 21c shown in FIG. 13, the recesses 25c in the outer row are displaced from the recesses 25c in the inner row.

In the capacitors shown in FIGS.
Each tube 21d has a longitudinally spaced recess 2
Two rows of 5d are provided.

The tube is preferably made of a plate material having a coating on the inner and outer surfaces. The tube is manufactured by the following steps. That is, first, the side edge portions on both sides of the plate material are bent by rolling to give a roundness. The radius of curvature corresponds to the radius of curvature of the rounded edge welded in the longitudinal direction of the tube. Then, the central portion of the plate material is gradually rolled to give a roundness to form the other side edge portion extending in the longitudinal direction of the finished tube. A rounded free side edge portion and a central bend are utilized to accurately position the center of the sheet as it is fed over a series of rolls and rolled in stages.
Thereafter, the separated free side edge portions of the rolled plate material are heated, and the plate material is passed through a guide disposed immediately upstream of the pair of squeeze rolls to weld the free side edge portions to each other. This guide engages the free side edge portions on the opposite sides of the plate in the lateral direction with each other. The protrusions inside the strip are joined before the free side edges of the strips are welded together. When the tube is attached to the header with the fins, the entire assembly is heated to cause the coating on the tube to weld the inner surfaces of the protrusions together and the outer surface of the tube to the slot in the header through which the end of the tube passes. .

The plate material is rolled stepwise after the recess is formed. Stepwise rolling is performed as follows. First, by rolling and bending the side edge while restraining the free end of the opposite side edge of the flat plate, the flat side edge and the flat part in the center of the plate are connected via the bent part. The side edge portion forms an acute angle with respect to the central flat portion. This partially bent structure provides a guide for accurate positioning of the plate as it advances to the next step. In the next step, the flat side edge portions on both sides of the plate are formed into a curved structure having a radius corresponding to the radius of curvature of the rounded welding edge extending in the longitudinal direction of the finished tube. Then, the plate material passes through a series of steps to gradually roll the central portion and form the curved shape at the other side edge portion extending in the longitudinal direction of the finished tube. A rounded free side edge and a central bend are then used to accurately position the center of the sheet as it is fed onto a series of rolls and rolled in stages. Thereafter, the separated free edges of the rolled plate material are heated, and the plate material is passed through a guide disposed immediately upstream of the pair of squeeze rolls to weld the free side edge portions to each other. This guide engages the free side edge portions on the opposite sides of the plate in the lateral direction with each other.

As described above, the tubes, fins and headers are assembled after the tubes have been formed and the free side edge portions of the plates have been joined together by local heating. By heating the entire assembly, the outer surfaces of the ends of the tube are welded to the header, the fins are welded to the tube, and the recesses are welded together by the coating inside the tube. This makes it possible to construct a high-voltage capacitor with a light material and to provide an improved capacitor manufacturing method.

[Brief description of drawings]

FIG. 1 is a partial vertical cross-sectional view of a capacitor that is an embodiment of the present invention, taken along line 1-1 in FIG.

2 is a cross-sectional view taken along the line 2-2 in FIG.

3 is a cross-sectional view taken along the line 3-3 of FIG.

FIG. 4 is a plan view of a tube used in the capacitor shown in FIGS.

5 is an end view taken along line 5-5 of FIG.

6 is an enlarged partial cross-sectional view of a circle portion of FIG.

FIG. 7 is a partial plan view showing a modified example of the tube.

8 is an end view taken along the line 8-8 in FIG.

9 is a partial cross-sectional view enlarging a circle portion of FIG.

FIG. 10 is a partial plan view showing still another modified example of the tube.

11 is a sectional view taken along the line 11-11 in FIG.

FIG. 12 is an enlarged partial cross-sectional view of a part of the tube shown in FIG.

FIG. 13 is a partial plan view showing still another modified example of the tube.

FIG. 14 is a partial cross-sectional view showing a modified example of the capacitor.

15 is a partial cross-sectional view taken along the line 15-15 in FIG.

16 is a partial cross-sectional view taken along the line 16-16 of FIG.

FIG. 17 is a cross-sectional view of a forming plate showing a step of completing a tube step by step.

[Explanation of symbols]

 20 High Voltage Capacitors 21, 21a, 21b, 21c, 21d Tube 22 Heat Exchange Fin 23 Header 24 End Cap 25, 25a, 25b, 25c, 25d Recess

Claims (5)

[Claims] 1. A method for producing a high voltage capacitor having a plurality of flat tubes each having two rounded side edges extending in a longitudinal direction, and inserting both ends of the tubes into a slot of a header. Then, a step of coating both sides of the flat plate material, a step of forming a plurality of recesses arranged at intervals in the plate material, and rolling the side edge portions on both sides of the plate material to give a roundness of the completed tube. Having the step of forming the side edge portions on both sides into a curved surface shape having a radius corresponding to the radius of curvature of one side edge portion, and rolling the central portion of the plate material stepwise, the other roundness of the completed tube Has a curved shape at the side edge extending in the longitudinal direction, and when the plate material is fed onto a series of rolls in the process, the plate material is rounded to accurately position the center of the plate material. Using the side edge portion and the central portion, the heated free side edge portion of the rolled plate material is then heated, and the plate material is passed through a guide arranged immediately upstream of the pair of squeeze rolls. By engaging and welding mutually free side edge portions on the opposite side in the lateral direction, engaging the protrusions inside the plate member with each other, and inserting both ends of the tube into the slots of the header, Assembling the tube with the fins into the header, heating the entire assembly to cause the coating on the tube to weld the inner surfaces of the protrusions together and the outer surface of the tube to the slot in the header through which the end of the tube passes. And a step of welding the fins to the tube. 2. The method of manufacturing a high voltage capacitor according to claim 1, wherein the step of forming the recesses comprises forming recesses which are arranged in the lateral direction of the tube with a space therebetween and extend in the longitudinal direction. 3. The method of manufacturing a high voltage capacitor according to claim 1, wherein the step of forming the recesses comprises forming recesses which are arranged at intervals in the longitudinal direction and the lateral direction of the tube. 4. The method of manufacturing a high voltage capacitor according to claim 3, wherein the recesses are arranged in a plurality of rows extending in the longitudinal direction. 5. The fabrication of a high voltage capacitor as claimed in claim 1, wherein the step of forming the recesses comprises forming the recesses such that the recesses of one row are displaced from the recesses of the adjacent row in the longitudinal direction. Method.