Screen to be used during brazing of heat exchanger and brazing method for heat exchanger

Patent metadata

Field	Value
Publication number	US-12472573-B2
Application number	US-202117798066-A
Country	US
Kind code	B2
Filing date	Jan 25, 2021
Priority date	Feb 7, 2020
Publication date	Nov 18, 2025
Grant date	Nov 18, 2025

Abstract

A screen for brazing a heat exchanger including a plurality of core plates and a base plate. The plurality of core plates may be formed from an aluminum alloy brazing sheet containing magnesium and may have a shape having a taper portion at a periphery. The base plate may be larger and thicker than a core plate of the plurality of core plates. The plurality of core plates and the base plate may be heated and brazed under an inert gas atmosphere. The screen may include a metal tube enclosing a stacked body of the plurality of core plates. The tube may follow the outer border of the plurality of core plates such that a specific minute gap is defined between an inner wall face of the tube and a tip edge of the taper portion.

First claim

The invention claimed is:

1 . A screen for brazing a heat exchanger including a plurality of core plates formed from an aluminum alloy brazing sheet containing magnesium (Mg), the plurality of core plates formed in a shape having a taper portion at a periphery, a base plate disposed on a lower face side of the plurality of core plates, the base plate being larger and thicker than a core plate of the plurality of core plates, the plurality of core plates and the base plate heated and brazed under an inert gas atmosphere, the screen comprising:
a metal tube enclosing a stacked body of the plurality of core plates, the tube following an outer border of the plurality of core plates such that a specific minute gap is defined between an inner wall face of the tube and a tip edge of the taper portion; the tube mounted onto the base plate; and wherein the taper portion of the plurality of core plates are stacked such that the taper portions touch together.

2 . The screen according to claim 1 , wherein the taper portion of each of the plurality of core plates projects obliquely from the periphery, and when each core plate of the plurality of core plates is stacked in a vertical direction, the taper portions of the plurality of core plates mutually overlap and are tight together.

3 . The screen according to claim 1 , wherein:
a bottom end of the tube is configured to engage an engaging portion of the base plate; and the tube is positionable on the base plate via engaging the engaging portion of the base plate and the bottom end of the tube.

4 . The screen according to claim 1 , wherein the base plate includes a plurality of locating pins structured and arranged to locate the tube on the base plate and to locate the stacked body of the plurality of core plates on the base plate.

5 . The screen according to claim 1 , further comprising a second base plate, wherein:
the second base plate is smaller than the first base plate and is superimposed on the first base plate; and the tube is positionable on the base plate via engaging the tube and a periphery of the second base plate.

6 . The screen according to claim 1 , wherein the minute gap is 0.5 mm to 5 mm.

7 . The screen according to claim 1 , wherein the tube includes a brim portion arranged at a top end of the tube, the brim portion covering a top end of the minute gap.

8 . The screen according to claim 1 , wherein:
the tube includes a plurality of separate pieces; and the plurality of separate pieces enclose, from a perimeter, the stacked body of the plurality of core plates assembled on the base plate.

9 . The screen according to claim 8 , wherein:
the plurality of separate pieces includes a first half portion and a second half portion; and the first half portion and the second half portion sandwich, from both sides, the stacked body of the plurality of core plates assembled on the base plate.

10 . The screen according to claim 9 , wherein:
the first half portion includes an edge portion that is offset to an outside only by a thickness of the second half portion; and at a boundary between the first half portion and the second half portion, the edge portion of the first half portion overlaps an edge portion of the second half portion such that the edge portion of the second half portion is positioned on an inside of the edge portion of the first half portion.

11 . The screen according to claim 1 , wherein the tube is composed of a metal material having a coefficient of thermal expansion of at least 11×10-6 and a melting point of at least 650° C.

12 . A brazing method for a heat exchanger, comprising:
stacking a plurality of core plates, which are formed from an aluminum alloy brazing sheet containing magnesium (Mg) and formed in a shape having a taper portion at the periphery, on a base plate having a greater thickness than the plurality of core plates, the plurality of core plates stacked such that the taper portions touch together and a lower face side of the plurality of core plates is disposed on the base plate; enclosing a stacked body of the plurality of core plates via mounting a screen onto the base plate such that the screen is conveyable together with the base plate; brazing the plurality of core plates to one another and to the base plate via sending the base plate with the screen mounted thereto into a furnace together with the stacked body of the plurality of core plates and heating under an inert gas atmosphere; and wherein mounting the screen onto the base plate includes arranging the screen spaced apart from an outer border of the plurality of core plates such that a minute gap is defined between an inner wall face of the screen and a tip edge of the taper portion.

13 . A heat exchanger, comprising:
a plurality of core plates stacked on one another to define a stacked body, the plurality of core plates each formed from an aluminum alloy brazing sheet containing magnesium (Mg); a base plate having a width that is larger than a width of a core plate of the plurality of core plates, the base plate disposed on a lower face side of the plurality of core plates; and a screen configured as a metal tube and mounted onto the base plate, the screen enclosing the stacked body; the plurality of core plates each having a periphery and a taper portion disposed at the periphery, the plurality of core plates stacked such that the taper portions touch together; the stacked body arranged on an upper face of the base plate; wherein the screen is arranged on the base plate spaced apart from the stacked body and extends around an outer border of the stacked body such that a specific minute gap is defined between an inner wall face of the tube and a tip edge of the taper portion; and wherein the plurality of core plates and the base plate are heated and brazed under an inert gas atmosphere.

14 . The heat exchanger of claim 13 , wherein:
the taper portion of at least one core plate of the plurality of core plates projects vertically from the periphery of the at least one core plate; the plurality of core plates are stacked in a vertical direction; and the taper portion of each of the plurality of core plates overlaps the taper portion of an adjacent core plate of the plurality of core plates.

15 . The heat exchanger of claim 13 , wherein the screen includes a first half portion and a second half portion that engage one another to define the screen.

16 . The heat exchanger of claim 15 , wherein:
the first half portion includes a first edge portion; the second half portion includes a second edge portion; and the first edge portion protrudes outwardly from the first half portion and overlaps the second edge portion.

17 . The heat exchanger of claim 13 , wherein the base plate includes an engaging portion configured to engage a bottom end of the screen to position the screen on the base plate.

18 . The heat exchanger of claim 13 , wherein the base plate includes a plurality of locating pins configured to position the stacked body on the top surface of the base plate.

19 . The heat exchanger of claim 13 , further comprising a second base plate, wherein:
the second base plate is smaller than the base plate; the second base plate is superimposed on the top surface of the base plate; and the screen extends around an edge of the second base plate.

20 . The method of claim 12 , wherein mounting the screen onto the base plate includes positioning the screen on the base plate via engaging a bottom end of the s

Assignees

• Mahle Int Gmbh
• Mahle Filter Systems Jp Corp

Inventors

• Ariyama Masahiro
• Hatano Yohei
• Kumagai Hiroshi

Classifications

• F28F2275/04

  by brazing · CPC title

• F28D9/005

  the plates having openings therein for both heat-exchange media · CPC title

• B23K3/087

  Soldering or brazing jigs, fixtures or clamping means · CPC title

• F28D2021/0089

  Oil coolers · CPC title

• B23K2101/14

  Heat exchangers · CPC title