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CN-122029395-A - Heat transfer plate and box

CN122029395ACN 122029395 ACN122029395 ACN 122029395ACN-122029395-A

Abstract

A heat transfer plate (8, 8a,8b,8 c) and a cassette (57) are provided. The heat transfer plates (8, 8a,8b,8 c) comprise an upper end portion (26) having a first and a second port hole (40, 42), a central portion (28) having a heat transfer area (46), and a lower end portion (30) having a third and a fourth port hole (48, 50). Further, the heat transfer plates (8, 8a,8b,8 c) further comprise a sealing groove (64), the sealing groove (64) comprising a domain sealing groove portion (64 a), the domain sealing groove portion (64 a) surrounding the heat transfer region (46) and two of the first, second, third and fourth port holes (40,42,48,50). The heat transfer plates (8, 8a,8b,8 c) further comprise a gasket groove (68), the gasket groove (68) comprising a domain gasket groove portion (68 a), the domain gasket groove portion (68 a) surrounding the heat transfer region (46) and two of the first, second, third and fourth port holes (40,42,48,50) not surrounded by the domain seal groove portion (64 a). The heat transfer plates (8, 8a,8b,8 c) are characterized in that the first port hole (40) and the third port hole (48) are non-circular and the second port hole (42) and the fourth port hole (50) are circular.

Inventors

  • J. NELSON

Assignees

  • 阿法拉伐股份有限公司

Dates

Publication Date
20260512
Application Date
20241002
Priority Date
20231017

Claims (15)

  1. 1. A heat transfer plate (8, 8a,8b,8 c) comprising an upper end portion (26), a central portion (28) and a lower end portion (30) arranged in sequence along a longitudinal centre axis (L) of the heat transfer plate (8, 8a,8b,8 c), the longitudinal centre axis (L) being perpendicular to a transversal centre axis (T) of the heat transfer plate (8, 8a,8b,8 c), the upper end portion (34) comprising a first port hole (40) and a second port hole (42) and the lower end portion (38) comprising a third port hole (48) and a fourth port hole (50), the central portion (36) comprising a heat transfer area (46), the heat transfer area (46) being provided with a pattern of heat transfer corrugations comprising ridges (60) and valleys (62) as seen from a first side (30) of the heat transfer plate (8, 8a,8b,8 c), the ridges (60) and valleys (62) extending between an imaginary parallel first plane (P1) and a first plane (P2) and a second plane (2) and facing the second side (8 a,8 c) of the heat transfer plate (8, 8a,8 c), the sealing groove (64) comprises a domain sealing groove portion (64 a), the domain sealing groove portion (64 a) surrounding the heat transfer region (46) and two of the first, second, third and fourth port holes (40,42,48,50), the heat transfer plates (8, 8a,8b,8 c) further comprising a gasket groove (68), the gasket groove (68) comprising a domain gasket groove portion (68 a), the domain gasket groove portion (68 a) surrounding the heat transfer region (46) and two of the first, second, third and fourth port holes (40,42,48,50) that are not surrounded by the domain sealing groove portion (64 a), characterized in that the first and third port holes (40, 48) are non-circular and the second and fourth port holes (42, 50) are circular.
  2. 2. A heat transfer plate (8, 8a,8b,8 c) according to claim 1, wherein the first port hole (40) and the third port hole (48) are arranged on one side of the longitudinal centre axis (L) of the heat transfer plate (8, 8a,8b,8 c), and the second port hole (42) and the fourth port hole (50) are arranged on the other side of the longitudinal centre axis (L) of the heat transfer plate (8, 8a,8b,8 c).
  3. 3. A heat transfer plate (8, 8a,8b,8 c) according to any of the preceding claims, wherein the domain seal groove (64 a) encloses the second port hole (42) and the fourth port hole (50).
  4. 4. A heat transfer plate (8, 8a,8b,8 c) according to any of the preceding claims, wherein a bottom (66 a) of the domain seal groove (64 a) extends in the second plane (P2) along at least more than half the length of the domain seal groove (64 a).
  5. 5. A heat transfer plate (8, 8a,8b,8 c) according to any of the preceding claims, wherein the sealing groove (64) further comprises a first annular sealing groove portion (64 b) surrounding the first port hole (40) and a third annular sealing groove portion (64 c) surrounding the third port hole (48), as seen from the first side (30) of the heat transfer plate, wherein a bottom portion (66 b) of the first annular sealing groove portion (64 b) extends in the second plane (P2) along at least more than half the length of the first annular sealing groove portion (64 b), and a bottom portion (66 c) of the third annular sealing groove portion (64 c) extends in the second plane (P2) along at least more than half the length of the third annular sealing groove portion (64 c).
  6. 6. A heat transfer plate (8, 8a,8b,8 c) according to any one of the preceding claims, wherein the gasket groove (68) further comprises a second annular gasket groove portion (68 b) surrounding the second port hole (42) and a fourth annular gasket groove portion (68 c) surrounding the fourth port hole (50), wherein a bottom portion (70 b) of the second annular gasket groove portion (68 b) extends between the first plane (P1) and the second plane (P2) along at least more than half of the length of the second annular gasket groove portion (68 b), and a bottom portion (70 c) of the fourth annular gasket groove portion (68 c) extends between the first plane (P1) and the second plane (P2) along at least more than half of the length of the fourth annular gasket groove portion (68 c).
  7. 7. A heat transfer plate (8, 8a,8b,8 c) according to any one of the preceding claims, wherein the first port hole (40) and the third port hole (48) each have only one axis of symmetry(s).
  8. 8. A heat transfer plate (8, 8a,8b, 8C) according to any one of claims 1-6, wherein the first port hole (40) is arranged in a portion (72) of the heat transfer plate (8, 8a,8b, 8C), the portion (72) being defined by a first short side (22), a first long side (18), the longitudinal centre axis (L) and the transverse centre axis (T) of the heat transfer plate (8, 8a,8b, 8C), and wherein a reference point (88) of the first port hole (40) coincides with a centre point (C) of a largest imaginary circle (90) fittable into the first port hole (40), the form of the first port hole (40) being defined by: -a plurality of corner points (74, 76, 78) of an imaginary plane geometry (80), at least one of said corner points being displaced from an arc (100) of said circle (90), and The same number of curves (82, 84, 86) without straight portions and connecting the corner points (74, 76, 78), Wherein a first corner point (74) of the corner points (74, 76, 78) is arranged closest to a transition (92) between the first short side (22) and the first long side (18) and at a first distance (d 1) from the reference point (88), a second corner point (76) of the corner points (74, 76, 78) is arranged closest to the first corner point (74) in a clockwise direction and at a second distance (d 2) from the reference point (88), and a third corner point (78) of the corner points (74, 78) is arranged closest to the first corner point (74) in a counter-clockwise direction and at a third distance (d 3) from the reference point (88).
  9. 9. A heat transfer plate (8, 8a,8b,8 c) according to any one of the preceding claims, wherein the first port hole (40) and the third port hole (48) have the same size and the second port hole (42) and the fourth port hole (50) have the same size.
  10. 10. A heat transfer plate (8, 8a,8b,8 c) according to any one of the preceding claims, wherein the first port hole (40) and the third port hole (48) have the same shape.
  11. 11. A heat transfer plate (8, 8a,8b,8 c) according to any one of the preceding claims, wherein the first port hole (40) and the third port hole (48) are symmetrical with respect to the transverse central axis (T) and/or the second port hole (42) and the fourth port hole (50) are symmetrical with respect to the transverse central axis (T).
  12. 12. A heat transfer plate (8, 8a,8b,8 c) according to any one of the preceding claims, wherein the two of the first, second, third and fourth port holes (40,42,48,50) enclosed by the domain seal groove (64 a) are arranged outside the domain gasket groove (68 a), and wherein the two of the first, second, third and fourth port holes (40,42,48,50) enclosed by the domain gasket groove (68 a) are arranged outside the domain seal groove (64 a).
  13. 13. A heat transfer plate (8, 8a,8b,8 c) according to any one of the preceding claims, wherein the longitudinal centre axis (L) and the transverse centre axis (T) divide the heat transfer plate (8, 8a,8b,8 c) into first, second, third and fourth portions (1, 3,5, 7), wherein the first port hole (40) is arranged in the first portion (1), the second port hole (42) is arranged in the second portion (3), the third port hole (48) is arranged in the third portion (5) and the fourth port hole (50) is arranged in the fourth portion (7).
  14. 14. A heat transfer plate (8, 8a,8b,8 c) according to any one of the preceding claims, wherein the longitudinal centre axis (L) extends entirely outside the first, second, third and fourth port holes (40,42,48,50).
  15. 15. A cassette (57) comprising two heat transfer plates (8, 8a,8b,8 c) according to any one of the preceding claims, wherein the second side (32) of one of the two heat transfer plates (8, 8a,8b,8 c) faces the second side (32) of the other of the two heat transfer plates (8, 8a,8b,8 c), and the other of the two heat transfer plates (8, 8a,8b,8 c) is rotated 180 degrees around a normal (N) of the other of the two heat transfer plates (8, 8a,8b,8 c), wherein the two heat transfer plates (8, 8a,8b,8 c) are welded to each other along the sealing groove (64).

Description

Heat transfer plate and box Technical Field The present invention relates to a heat transfer plate and a cassette comprising two such heat transfer plates. Background Plate Heat Exchangers (PHEs) typically comprise two end plates, between which a plurality of heat transfer plates are arranged in a stack or group. The heat transfer plates of the PHE may be of the same or different types, and they may be stacked in different ways. In some PHEs, the heat transfer plates are stacked such that the front and rear sides of one heat transfer plate face the rear and front sides of the other heat transfer plate, respectively, and every other heat transfer plate is inverted with respect to the remaining heat transfer plates. Typically, this is referred to as "rotating" the heat transfer plates relative to each other. In other PHEs, the heat transfer plates are stacked such that the front and rear sides of one heat transfer plate face the front and rear sides of the other heat transfer plate, respectively, and every other heat transfer plate is inverted with respect to the remaining heat transfer plates. Typically, this is referred to as the heat transfer plates "flipping" relative to each other. In a well known type of PHE (so-called semi-welded PHE), the heat transfer plates are typically "flipped" with respect to each other and welded in pairs to form a compact cassette with gaskets arranged between the cassettes. The end plates (and thus the cassettes) are pressed towards each other by some type of tightening means, whereby the gasket seals between the cassettes. Parallel flow channels are formed between the heat transfer plates, one channel between each pair of adjacent heat transfer plates. Two fluids of initially different temperatures supplied to/from the PHE by means of a pump-like device through the inlet/outlet may alternately flow through every other channel for transferring heat from one fluid to the other, the fluids entering/leaving the channels through inlet/outlet port holes in the heat transfer plates, the inlet/outlet port holes forming inlet/outlet port holes communicating with the inlet/outlet of the PHE. Thus, in a semi-welded PHE, there are channels defined by welds and channels defined by gaskets, which typically extend along the outer edges of the heat transfer plates and the inlet/outlet port holes. Typically, the channels defined by the weld can, and should preferably, withstand much higher pressures than the channels defined by the shims. WO 2009/082333 discloses a PHE comprising heat transfer plates permanently joined in pairs by weld seams to form cassettes, and gaskets sealing between the cassettes, i.e. a semi-welded heat exchanger. Even if such a heat exchanger works well, it may still have room for improvement. WO01/67021 discloses a heat transfer plate comprising a heat transfer portion, a sealing portion and a port. The heat transfer plate has a line of symmetry about which the heat transfer portion, the sealing portion and the ports of the plate are symmetrically arranged. WO03/006911 discloses a heat transfer plate comprising a first port part with at least two ports and a second port part with at least two ports. The ports in the first port portion are positioned along a first line parallel to the longitudinal direction of the plate. Further, the ports in the second port portion are positioned along a second line parallel to the longitudinal direction of the plate. FR2967248 relates to a heat exchanger comprising a stack of plates defining a chamber containing channel means. Disclosure of Invention It is an object of the invention to provide a heat transfer plate that enables an improved heat exchanger compared to prior art heat exchangers. The basic idea of the invention is to provide a heat transfer plate having two port holes with a shape deviating from a circular shape, in other words two non-circular port holes. Thereby, the flexibility of the heat transfer plate may be increased and the heat transfer plate may be optimized for different situations. It is a further object of the invention to provide a cassette comprising two such heat transfer plates. A heat transfer plate (also referred to herein simply as a "plate") and a cassette are defined in the appended claims and discussed below. The heat transfer plate according to the invention comprises an upper end portion, a central portion and a lower end portion, which are arranged in this order along the longitudinal centre axis of the heat transfer plate. The longitudinal central axis is perpendicular to the transverse central axis of the heat transfer plate. The upper end portion includes a first port hole and a second port hole, and the lower end portion includes a third port hole and a fourth port hole. The central portion comprises a heat transfer area provided with a heat transfer corrugation pattern comprising ridges and valleys, seen from a first side of the heat transfer plate. The ridges and valleys extend in and bet