Heat transfer plate and plate heat exchanger comprising such a heat transfer plate

Patent metadata

Field	Value
Publication number	US-9816763-B2
Application number	US-201515319600-A
Country	US
Kind code	B2
Filing date	May 21, 2015
Priority date	Jun 18, 2014
Publication date	Nov 14, 2017
Grant date	Nov 14, 2017

Abstract

A heat transfer plate has first and second long sides, with a transition area adjoining the distribution area along a first borderline and adjoining a heat transfer area along a second borderline. The transition area includes a transition pattern comprising transition projections and depressions, and first, second and third sub-areas successively arranged between the first/second border lines. An imaginary straight line extends between two end points of each transition projection with a smallest angle α n , n=1, 2, 3 . . . relative to a longitudinal center axis of the plate. The smallest angle varies between transition projections within the second sub-area such that the smallest angle for at least a main part of the transition projections within the second sub-area is larger than the first angle α 1 , and the smallest angle for a main part of the transition projections within the first sub-area is essentially equal to the first angle.

First claim

The invention claimed is:

1. A heat transfer plate having a central extension plane, a first long side and second long side and comprising a distribution area, a transition area and a heat transfer area arranged in succession along a longitudinal center axis of the heat transfer plate, the transition area adjoining the distribution area along a first borderline and the heat transfer area along a second borderline, the heat transfer area, the distribution area and the transition area being provided with a heat transfer pattern, a distribution pattern and a transition pattern, respectively, the transition pattern differing from the distribution pattern and the heat transfer pattern and comprising transition projections and transition depressions in relation to the central extension plane, the transition area comprising a first sub area, a second sub area and a third sub area arranged in succession between the first and second border lines and adjoining each other along fifth and sixth borderlines, respectively, extending between and along adjacent ones of the transition projections, the first sub area being closest to the first long side and the third sub area being closest to the second long side, an imaginary straight line extending between two end points of each transition projection with a smallest angle α n , n=1, 2, 3 . . . in relation to the longitudinal center axis, the smallest angle α n for at least a main part of the transition projections within the first sub area being essentially equal to a first angle α 1 , and the smallest angle α n varying between the transition projections within the second sub area such that the smallest angle α n for at least a main part of the transition projections within the second sub area is larger than said first angle α 1 and increasing in a direction from the first long side to the second long side, wherein at least a main part of the second borderline is straight and essentially perpendicular to the longitudinal center axis of the heat transfer plate, and the smallest angle α n for a first set of the transition projections within the third sub area is essentially equal to said first angle α 1 , the fifth borderline between the first and second sub areas being located, seen from the first long side of the heat transfer plate, just before the first two successive transition projections within the transition area that both are associated with a smallest angle α n larger than said first angle α 1 , and the sixth borderline between the second and the third sub areas being located, seen from the fifth borderline, just before the first two successive transition projections within the transition area that both are associated with a smallest angle α n equal to said first angle α 1 .

2. A heat transfer plate according to claim 1 , wherein at least a main part of the transition projections of said first set of transition projections within the third sub area extends from the second borderline.

3. A heat transfer plate according to claim 2 , wherein the smallest angle α n for a second set of the transition projections within the third sub area is larger than said first angle α 1 , at least a main part of the transition projections of said second set extending from the first borderline.

4. A heat transfer plate according to claim 3 , wherein each of at least a main part of the transition projections within the third sub area extending from the second borderline is connected to a respective one of the transition projections within the third sub area extending from the first borderline.

5. A heat transfer plate according to claim 1 , wherein a shortest distance between the imaginary straight lines of two adjacent, along each other extending, transition projections within the third sub area is essentially constant within a main portion of the third sub area.

6. A heat transfer plate according to claim 1 , wherein the heat transfer area borders on the third sub area of the transition area along 10-40% of the second border line.

7. A heat transfer plate according to claim 1 , wherein a center portion of the first borderline is arched and convex as seen from the heat transfer area such that the center portion of the first borderline coincides with a contour of an imaginary oval, the first borderline deviating from the contour of the imaginary oval outside the center portion.

8. A heat transfer plate according to claim 7 , wherein a second outer portion of the first borderline, which extends from the center portion of the first borderline towards the second long side of the heat transfer plate, extends towards the second borderline.

9. A heat transfer plate according to claim 8 , wherein the second outer portion of the first borderline extends at a distance from, and essentially parallel to, a fourth borderline delimiting the distribution area.

10. A heat transfer plate according to claim 7 , wherein the center portion of the first borderline occupies 40-90% of a width of the heat transfer plate.

11. A plate heat exchanger comprising a heat transfer plate according to claim 1 .

Assignees

• Alfa Laval Corp Ab

Inventors

• Blomgren Fredrik

Classifications

• F28F9/0265

  by using guiding means or impingement means inside the header box · CPC title

• F28F3/046 Primary

  the deformations being linear, e.g. corrugations · CPC title

• F28D9/005

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

• F28F2210/10

  Particular layout, e.g. for uniform temperature distribution · CPC title

• F28F3/08

  Elements constructed for building-up into stacks, e.g. capable of being taken apart for cleaning · CPC title