Heat exchanger plate with strengthened diagonal area

Abstract

A heat transfer plate and/or a plate heat exchanger including the heat transfer plate includes a plate body forming a patterned section and having a first side and a second side opposite to the first side; a gasket groove formed depressed from the plate body in a direction from the first side towards the second side, and having a bottom wall, the bottom wall having a bottom wall body; and where the gasket groove includes at least a first section with a first recess formed on the bottom wall body, depressed from the bottom wall body in the direction from the first side towards the second side, and a second section with a second recess formed on the bottom wall body, depressed from the bottom wall body in the direction from the second side towards the first side, wherein the second section is adapted to accommodate a gasket.

Claims

1. A plate heat exchanger comprising: first and second heat transfer plates, each heat transfer plate having a plate body forming a patterned section and having a first side and a second side opposite to the first side; each heat transfer plate having a gasket-groove formed depressed from the plate body in a direction from the first side towards the second side, and having a bottom wall, the bottom wall having a bottom wall body; wherein the gasket groove includes one or more first sections, each first section with a first recess formed on the bottom wall body, the first recess depressed from the bottom wall body in the direction from the first side towards the second side, and one or more second sections, each second section with a second recess formed on the bottom wall body, the second recess depressed from the bottom wall body in the direction from the second side towards the first side; wherein each heat transfer plate comprises a first pair of openings, including a first inlet and a first outlet, and a second pair of openings, including a second inlet and a second outlet; wherein on the second heat transfer plate one or more first sections are positioned to separate the patterned section from the first inlet and the first outlet, and one or more second sections are positioned to separate the patterned section from the second inlet and the second outlet; wherein the first heat transfer plate is stacked on the second heat transfer plate; wherein one or more gaskets are located between the first and second heat transfer plates and are positioned in the one or more second sections of the second heat transfer plate; and wherein the one or more gaskets seal the second inlet and second outlet from the patterned section which is located between the first and second heat transfer plates.

2. The plate heat exchanger according to claim 1, wherein no gasket is positioned in said first section of the second heat transfer plate, and said first inlet and said first outlet of the second heat transfer plate have flow access to flow paths formed within the patterned section between the first and second heat transfer plates.

3. The plate heat exchanger according to claim 1, wherein the second heat transfer plate includes two first sections associated with the first inlet and the first outlet, respectively, and two second sections associated with the second inlet and the second outlet, respectively, and wherein the gasket groove further includes a third section with a flat bottom wall body connecting the two first sections or connecting the two second sections.

4. The plate heat exchanger according to claim 1, wherein the gasket positioned in said second section of the second heat transfer plate is contacted by the second side of the first section of the first heat transfer plate.

5. The plate heat exchanger according to claim 1, wherein said first side of said first section of the first heat transfer plate is empty, but said second side of said first section of the first heat transfer plate contacts the gasket positioned in a second section of said second heat transfer plate.

6. The plate heat exchanger according to claim 1, wherein said gasket is shaped at an upper surface with an upper recess to receive the first recess of the first heat transfer plate and/or wherein said gasket is shaped at a lower surface with a lower recess to receive the second recess of the second heat transfer plate.

7. The plate heat exchanger according to claim 1, wherein the gasket is not shaped at the upper and lower surface according to the shapes of the first recess and the second recess, respectively, but is deformed by the first and second recesses respectively when squeezed between the two heat transfer plates.

8. The plate heat exchanger according to claim 1, wherein the first recess and second recess are differently shaped.

9. The plate heat exchanger according to claim 1, wherein the first recess and second recess have different widths.

10. The plate heat exchanger according to claim 1, wherein the first section has a bottom wall first width and the second section has a bottom wall second width different from said first width.

11. The plate heat exchanger according to claim 10, wherein the first width is smaller than the second width, such that when the first heat transfer plate is stacked on top of the second heat transfer plate, a portion of the second side of at least one second section of the first heat transfer plate is positioned on a part of the plate body forming at least one first section of said second heat transfer plate.

12. The plate heat exchanger according to claim 3, wherein the gasket positioned in said second section of the second heat transfer plate is contacted by the second side of the first section of the first heat transfer plate.

13. The plate heat exchanger according to claim 4, wherein said gasket is shaped at an upper surface with an upper recess to receive the first recess of the first heat transfer plate and/or wherein said gasket is shaped at a lower surface with a lower recess to receive the second recess of the second heat transfer plate.

14. The plate heat exchanger according to claim 4, wherein the gasket is not shaped at the upper and lower surface according to the shapes of the first recess and the second recess, respectively, but is deformed by the first and second recesses respectively when squeezed between the two heat transfer plates.

15. The plate heat exchanger according to claim 3, wherein the first recess and second recess are differently shaped.

16. The plate heat exchanger according to claim 4, wherein the first recess and second recess are differently shaped.

17. The plate heat exchanger according to claim 1, wherein the first recess of the first heat transfer plate and the second recess of the second heat transfer plate extend into the gasket.

18. The plate heat exchanger according to claim 1, wherein on the first heat transfer plate one or more second sections are positioned to separate the patterned section from the first inlet and the first outlet, and one or more first sections are positioned to separate the patterned section from the second inlet and the second outlet.

Description

FIGURES

(1) FIG. 1 Heat exchanger stack according to prior art.

(2) FIG. 2 Deformation of heat exchanger stack according to prior art.

(3) FIG. 3 Heat transfer plate diagonal area with recessed first and second gasket groove sections according to an embodiment of the present invention.

(4) FIGS. 4A, B Cross sections of two different gasket designs to be used in the heat transfer plates according to the present invention.

(5) FIGS. 5A, B Illustrations of two different embodiments of said respectively first and second sections of said gasket grooves stacked on top of each other.

DETAILED DESCRIPTION

(6) It should be understood, that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from the detailed description.

(7) FIG. 1 shows a typical construction of a plate heat exchanger 1′. The plate heat exchanger 1′ comprises a plurality of heat transfer plate 10′ stacked on top of each other. The heat transfer plates 10′ are formed with a patterned section 11 such that flow paths are formed between each set of neighboring heat transfer plates 10′. Openings 41 and 42 are formed in the heat transfer plates 10′ to form inlets and outlets for fluids to these flow paths. Gaskets 60 are positioned between the heat transfer plates 10′ in gasket grooves 20′ formed in the heat transfer plates. The gasket 60 is arranged at an edge portion of the heat transfer plate to seal the flow paths and at an area around the openings to seal pairs of the openings 41, 42, such that only two 41 of them have flow access to the flow path formed at one side of the heat transfer plate, while the other two 42 is sealed therefrom. The arrows with broken lines illustrate the flow of a fluid along the first side 111 patterned section 11 from an inlet to an outlet 31.

(8) Especially in the opening areas the pressures are high, but the gasket 60 is disposed at only one side of the heat transfer plate 10′, while the other side is unsupported, thus forming a weak section.

(9) As shown in FIG. 2, these weak sections in the areas of the high pressures may be deformed.

(10) In an embodiment, referring to FIGS. 3, 4A and 4B, the heat transfer plate 10 comprises a plate body 11 having a first side 111 and a second side 112 opposite to the first side 111. The heat transfer plate 10 further comprises a gasket groove 20 which is formed on the plate body 11, is depressed from the plate body 11 in a direction from the first side 111 towards the second side 112 and has a bottom wall 120 with a bottom wall body 121.

(11) The gasket groove 20 includes at least a first section 21 with a first recess 31 formed on the bottom wall body 121, depressed from the bottom wall body 121 in the direction from the first side 111 towards the second side 112, and a second section 22 with a second recess 32 formed on the bottom wall body 121, depressed from the bottom wall body 121 in the direction from the second side 111 towards the first side 112. The respectively first section 21 and second section 22 is positioned such that said first section 31 separate the first pair 41 of openings, and the second section 22 separate the second pair 42 of openings, from the heat exchanging sections of the flow paths formed by the combined patterned sections 12 of connected neighbouring plates.

(12) In an embodiment, the first section 21 is provided with a first recess 31 formed on the bottom wall body 121, depressed from the bottom wall body 121 in the direction from the first side 111 towards the second side 112. The second section 22 is provided with a second recess 32 formed on the bottom wall body 121, depressed from the bottom wall body 121 in the direction from the second side 111 towards the first side 112. The first 31 and second 32 recess thus project to opposite directions relative to the plate body 11 and to each other. Seen from one side of the plate body 11 first recess 31 and second 32 recess naturally will be recesses, whereas from the other they will appear as projections.

(13) The first and second recesses 31, 32 in themselves ensures some rigidity to the heat transfer plate 10 material in the opening areas (often referred to as the diagonal areas) which is better able to withstand the pressures in these areas, making them less prone to bending or deformation, but also assists in keeping the gasket in place, as will also be discussed later.

(14) In an embodiment the gasket groove 20 further includes a third section 23 formed in the edge portion at the circumference of the heat transfer plate 10, possible also having sections partly or fully encircling the openings 41, 42.

(15) When the heat exchanger 1 is formed is stacked by stacking heat exchanger plates 10 according to any embodiment, a gasket 60 is positioned in the gasket groove 20 except in the first section 21.

(16) The third section 23 will form the sealing to the external of the heat exchanger 1, and will be positioned such that it is positioned in combination with third sections 23 of the upper and lower connected heat transferring plates 10, such that the gasket 60 is squeezed between the third section 23 first side 111 bottom wall and the upper neighbouring heat transferring plate 10 third section 23 second side 112.

(17) The first section 21 will be empty of a gasket 60, such that there will be access from the first opening pair 41 to the patterned section 12, this pair then will form inlet and outlet to the flow path formed at the first side 111 of the heat transfer plate 10.

(18) The second section 22 will comprise a gasket 60 sealing off fluid from the second pair 42 to the first side 111 flow path.

(19) As also indicated in relation to FIG. 1, when stacking the heat transfer plates 10 to form the heat exchanger 1, a first section 21 will be aligned with a second section 22 of both an upper and lower neighbouring heat transfer plate 10, and correspondingly a second section 22 will be aligned with a first section 21 of both an upper and lower neighbouring heat transfer plate 10. Therefore, in these areas, the diagonal areas, every second heat exchanger plate 10 is unsupported by a gasket 60.

(20) The third section 23 may have any shape of the bottom wall body 121, such as being flat, and may further connect a first section 21 of respectively an inlet to an outlet of said first opening pair 41 and a second section 22 of respectively and an inlet to an outlet of said second opening pair 42.

(21) Each of the first 21, second 22 and third sections 23 may be a single section only or could each be a plural of sections of the gasket grove 20. They could be meandering sections or branched, open or closes sections.

(22) In an embodiment the gasket 60 is shaped at the upper and lower surface with an upper recess 61 and/or lower recess 62 as seen in FIG. 4A to receive the heat transfer plate 10 second recess 32 and/or the upper neighbouring heat transfer plate 10 first recess 31.

(23) In an embodiment as illustrated in FIG. 4B, the gasket 60 is not shaped according to the first 31 and second 32 recesses but could have upper and lower surfaces in any shape, such as flat as illustrated. In this embodiment the gasket 60 is being deformed by the first 31 and second 32 recesses respectively when squeezed between the two heat transfer plates 10. This is to be understood such that the whole of the gasket 60 may be squeezed a bit making a first general deformation of the gasket 60, but the first 31 and/or second 32 recesses push into the gasket 60 material with a second deformation.

(24) In one embodiment combining the features of FIGS. 4A and 4B, then the gasket 60 comprises either the upper 61 or lower 62 gasket recess, whereas the other of the upper or lower of the gasket 60 surfaces is unshaped according to the first 31 or second 32 recess, such as seen in FIG. 4B.

(25) In any of the embodiments the first 31 and second 32 recess thus assists in keeping the gasket 60 in position.

(26) In an embodiment the first recess 31 and second recess 32 is differently shaped, which could be that they have different widths, or could be simply the form of the recess 31, 32 is different, e.g. one having flat tops being square like, another being triangular like with pointing ends etc.

(27) FIG. 5A illustrate the aligned respectively first 21 and second 22 sections where four heat transfer plates 10 is stacked on top of each other, and where a gasket is situated within every second plate.

(28) FIG. 5B illustrated an embodiment where the first section 21 has a first width and second section 22 has second width different from said first width. In one embodiment as illustrated the first width is smaller than the second width, such that when an upper heat transfer plate 10 is stacked on top of said heat transfer plate 10, the outer portions of the upper heat transfer plate 10 is positioned on the part of the plate body 11 at the side of the second recess 22 of said heat transfer plate 10.

(29) It should be understood for any of the embodiments, that the first 21 and second 22 sections usually will not have ‘continuous’ walls, though it may appear as such from the illustrations, but will have a number of open sections in the walls forming the fluidic communication between an inlet and outlet 41, 42 and the patterned sections 12. When referring to respectively the first width and second width, this thus implies a general width of the sections 21, 22, such as where it does comprise walls opposite to each other. It should also be understood that in any of the embodiments the first and second widths may change along the length extensions of the first and second sections 21, 22, just as the widths of the first 31 and second 32 recesses may change.

(30) While the present disclosure has been illustrated and described with respect to a particular embodiment thereof, it should be appreciated by those of ordinary skill in the art that various modifications to this disclosure may be made without departing from the spirit and scope of the present disclosure.