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EP-4741754-A1 - SHELL AND PLATE HEAT EXCHANGER AND REFRIGERATION DEVICE

EP4741754A1EP 4741754 A1EP4741754 A1EP 4741754A1EP-4741754-A1

Abstract

A first surface (81) and a second surface (82) are joined to each other at the periphery of a first channel (33) and the periphery of a second channel (34). A third surface (83) and a fourth surface (84) are joined to each other at a peripheral portion of a second heat transfer plate (72) and a third heat transfer plate (73) and at a partitioning portion (75) located between the first channel (33) and the second channel (34). The second surface (82) includes a rough surface that is rough.

Inventors

  • NUMATA, MITSUHARU
  • YAMAGUCHI, MASAKI

Assignees

  • DAIKIN INDUSTRIES, LTD.

Dates

Publication Date
20260513
Application Date
20250731

Claims (18)

  1. A shell-and-plate heat exchanger comprising: a shell (11) having an internal space (15); and a plate stack (30) housed in the internal space (15) and including a first heat transfer plate (71), a second heat transfer plate (72), and a third heat transfer plate (73) which are stacked and joined together in a plate thickness direction, the plate stack (30) including: a refrigerant channel (31) which is provided between a first surface (81) of the first heat transfer plate (71) and a second surface (82) of the second heat transfer plate (72) and through which a refrigerant flows; a heating medium channel (32) which is provided between a third surface (83) of the second heat transfer plate (72) and a fourth surface (84) of the third heat transfer plate (73) and through which a heating medium flows; a first channel (33) extending in a stacking direction of the second heat transfer plate (72) and the third heat transfer plate (73) and communicating with the heating medium channel (32); and a second channel (34) extending in the stacking direction and communicating with the heating medium channel (32), the first surface (81) and the second surface (82) being joined to each other at a periphery of the first channel (33) and a periphery of the second channel (34), the third surface (83) and the fourth surface (84) being joined to each other at a peripheral portion of the second heat transfer plate (72) and the third heat transfer plate (73) and at a partitioning portion (75) located between the first channel (33) and the second channel (34), the second surface (82) including a rough surface that is rough.
  2. The shell-and-plate heat exchanger of claim 1, wherein the rough surface is provided in 80% or more of an area of the second surface (82).
  3. The shell-and-plate heat exchanger of claim 1 or 2, wherein the first surface (81) and the second surface (82) are joined together by brazing, and the third surface (83) and the fourth surface (84) are joined together by brazing.
  4. The shell-and-plate heat exchanger of claim 3, wherein a reservoir (95) is provided between a brazed portion (85) at the periphery of the first channel (33), where the first surface (81) and the second surface (82) are brazed, and the refrigerant channel (31), the reservoir (95) being configured to store a brazing material (87).
  5. The shell-and-plate heat exchanger of claim 4, wherein the reservoir (95) is a recessed portion of at least one of the first surface (81) or the second surface (82), at a position apart from the refrigerant channel (31).
  6. The shell-and-plate heat exchanger of claim 4, wherein the reservoir (95) is a recessed portion of at least one of the first surface (81) or the second surface (82), the reservoir (95) being recessed like a step to open toward the refrigerant channel (31).
  7. The shell-and-plate heat exchanger of any one of claims 4 to 6, wherein the reservoir (95) extends along a circumferential direction of the first channel (33) over an entire perimeter.
  8. The shell-and-plate heat exchanger of any one of claims 4 to 6, wherein a plurality of reservoirs (95), each being identical to the reservoir (95), are spaced apart from one another in a circumferential direction of the first channel (33).
  9. The shell-and-plate heat exchanger of any one of claims 4 to 8, wherein the second surface (82) at the periphery of the first channel (33) is not provided with the rough surface.
  10. The shell-and-plate heat exchanger of claim 1 or 2, wherein the first surface (81) and the second surface (82) are joined together by welding, and the third surface (83) and the fourth surface (84) are joined together by brazing.
  11. The shell-and-plate heat exchanger of any one of claims 3 to 10, wherein a peripheral portion of the first heat transfer plate (71) has a first protrusion (91) that bulges from the first surface (81) toward the refrigerant channel (31), and the peripheral portion of the second heat transfer plate (72) has a second protrusion (92) that bulges from the second surface (82) toward the refrigerant channel (31), the second protrusion (92) being in contact with the first protrusion (91).
  12. The shell-and-plate heat exchanger of claim 11, wherein contact surfaces of the first protrusion (91) and the second protrusion (92) are joined together by brazing.
  13. The shell-and-plate heat exchanger of claim 12, wherein a reservoir (95) is provided between a brazed portion (85), where the first protrusion (91) and the second protrusion (92) are brazed together on the contact surfaces, and the refrigerant channel (31), the reservoir (95) being configured to store a brazing material (87).
  14. The shell-and-plate heat exchanger of claim 13, wherein the reservoir (95) is a recessed portion of the contact surface of at least one of the first protrusion (91) or the second protrusion (92), at a position apart from the refrigerant channel (31).
  15. The shell-and-plate heat exchanger of claim 13, wherein the reservoir (95) is a recessed portion of the contact surface of at least one of the first protrusion (91) or the second protrusion (92), the reservoir (95) being recessed like a step to open toward the refrigerant channel (31).
  16. The shell-and-plate heat exchanger of claim 1 or 2, wherein the first surface (81) and the second surface (82) are joined together by welding, and the third surface (83) and the fourth surface (84) are joined together by welding.
  17. The shell-and-plate heat exchanger of claim 16, wherein the third surface (83) and the fourth surface (84) each have a flat peripheral portion.
  18. A refrigeration apparatus comprising: the shell-and-plate heat exchanger (10) of any one of claims 1 to 17; and a refrigerant circuit (1a) through which a refrigerant having exchanged heat in the shell-and-plate heat exchanger (10) flows.

Description

TECHNICAL FIELD The present disclosure relates to a shell-and-plate heat exchanger and a refrigeration apparatus. BACKGROUND ART Patent Document 1 discloses a heat exchange device including a tank and a plate package provided in the internal space of the tank. The plate package includes multiple heat transfer plates (heat exchange plates) adjacent to one another. The multiple heat transfer plates form a refrigerant channel (first space) through which a refrigerant flows and a heating medium channel (second space) through which a heating medium flows. The multiple heat transfer plates are joined together by brazing, for example. CITATION LIST PATENT DOCUMENT Patent Document 1: Japanese Unexamined Patent Publication (Japanese Translation of PCT Application) No. 2006-527835 SUMMARY OF THE INVENTION TECHNICAL PROBLEM To enhance the heat exchange efficiency of the refrigerant, there has been a demand for roughening the heat transfer surface of the refrigerant channel. Unfortunately, when multiple heat transfer plates are stacked on one another and brazed together, the roughened heat transfer surface becomes covered with a brazing material, and the heat exchange efficiency of the refrigerant cannot be improved. An object of the present disclosure is to enhance the heat exchange efficiency of a refrigerant by roughening the heat transfer surface of a refrigerant channel. SOLUTION TO THE PROBLEM A first aspect of the present disclosure includes: a shell (11) having an internal space (15); and a plate stack (30) housed in the internal space (15) and including a first heat transfer plate (71), a second heat transfer plate (72), and a third heat transfer plate (73) which are stacked and joined together in a plate thickness direction, the plate stack (30) including: a refrigerant channel (31) which is provided between a first surface (81) of the first heat transfer plate (71) and a second surface (82) of the second heat transfer plate (72) and through which a refrigerant flows; a heating medium channel (32) which is provided between a third surface (83) of the second heat transfer plate (72) and a fourth surface (84) of the third heat transfer plate (73) and through which a heating medium flows; a first channel (33) extending in a stacking direction of the second heat transfer plate (72) and the third heat transfer plate (73) and communicating with the heating medium channel (32); and a second channel (34) extending in the stacking direction and communicating with the heating medium channel (32), the first surface (81) and the second surface (82) being joined to each other at a periphery of the first channel (33) and a periphery of the second channel (34), the third surface (83) and the fourth surface (84) being joined to each other at a peripheral portion of the second heat transfer plate (72) and the third heat transfer plate (73) and at a partitioning portion (75) located between the first channel (33) and the second channel (34), the second surface (82) including a rough surface that is rough. According to the first aspect, the first surface (81) and the second surface (82) are joined to each other at the periphery of the first channel (33) and at the periphery of the second channel (34); therefore, the rough surface of the second surface (82) is exposed to the refrigerant channels (31). This can enhance the heat exchange efficiency of the refrigerant passing through the refrigerant channels (31). The third surface (83) and the fourth surface (84) are joined to each other at the peripheral portions of the second heat transfer plate (72) and the third heat transfer plate (73) and at the partitioning portions (75) to cause the heating medium to bypass and not to flow through the partitioning portions (75) between the first channel (33) and the second channel (34). Thus, a reduction in the heat exchange efficiency between the heating medium and the refrigerant can be reduced. A second aspect of the present disclosure is an embodiment of the shell-and-plate heat exchanger of the first aspect. In the second aspect, the rough surface is provided in 80% or more of an area of the second surface (82). According to the second aspect, providing a rough surface in 80% or more of the area of the second surface (82) can enhance the heat exchange efficiency of the refrigerant flowing through the refrigerant channels (31). A third aspect of the present disclosure is an embodiment of the shell-and-plate heat exchanger of the first or second aspect. In the third aspect, the first surface (81) and the second surface (82) are joined together by brazing, and the third surface (83) and the fourth surface (84) are joined together by brazing. According to the third aspect, the first surface (81) and the second surface (82) are joined together by brazing, and the third surface (83) and the fourth surface (84) are joined together by brazing. A fourth aspect of the present disclosure is an embodiment of the shell-and-plate heat exchanger of