Plate heat exchanger and heat pump heating and hot water supply system including the plate heat exchanger

Patent metadata

Field	Value
Publication number	US-10907906-B2
Application number	US-201716066744-A
Country	US
Kind code	B2
Filing date	Jan 19, 2017
Priority date	Feb 12, 2016
Publication date	Feb 2, 2021
Grant date	Feb 2, 2021

Abstract

In a plate heat exchanger, a bypass passage and a main passage are formed upstream of first passages and second passages between adjacent ones of first heat transfer plates and second heat transfer plates. The bypass passage allows first fluid flowing from an inflow port of the first fluid or second fluid flowing from an inflow port of the second fluid to pass a side farther than a corresponding one of adjacent holes while spreading in a vertical direction in a front view and then flow into an inner fin or a corrugated heat transfer surface. The main passage allows the first fluid flowing from the inflow port of the first fluid or the second fluid flowing from the inflow port of the second fluid to directly flow toward the inner fin or the corrugated heat transfer surface without routing through the bypass passage. A flat space is formed around an entire circumference of each of the adjacent holes, between a circumferential wall and the inner fin or the corrugated heat transfer surface.

First claim

The invention claimed is:

1. A plate heat exchanger comprising:
first heat transfer plates, each of the first heat transfer plates having a rectangular plate shape, and having a passage hole formed in one side portion thereof in a horizontal direction in a front view thereof to form an inflow port of first fluid, a passage hole formed in an other side portion thereof in the horizontal direction in the front view to form an outflow port of the first fluid, an adjacent hole formed in the one side portion or the other side portion to form an inflow port of second fluid, and an adjacent hole formed in the side portion opposite to the side portion formed with the adjacent hole for the second fluid to form an outflow port of the second fluid; and
second heat transfer plates, each of the second heat transfer plates having a rectangular plate shape, and having an adjacent hole formed in one side portion thereof in a horizontal direction in a front view thereof to form the inflow port of the first fluid, an adjacent hole formed in an other side portion thereof in the horizontal direction in the front view to form the outflow port of the first fluid, a passage hole formed in the one side portion or the other side portion to form the inflow port of the second fluid, and a passage hole formed in the side portion opposite to the side portion formed with the passage hole for the second fluid to form the outflow port of the second fluid,
wherein the first heat transfer plates and the second heat transfer plates are alternately stacked in a plurality of layers to alternately form first passages and second passages in a stacking direction between the first heat transfer plates and the second heat transfer plates, with the first passages allowing the first fluid to flow therethrough from the inflow port of the first fluid to the outflow port of the first fluid in the horizontal direction in the front view, and the second passages allowing the second fluid to flow therethrough from the inflow port of the second fluid to the outflow port of the second fluid in the horizontal direction in the front view, to exchange heat between the first fluid flowing through the first passages and the second fluid flowing through the second passages,
wherein each of the first heat transfer plates and a corresponding one of the second heat transfer plates have an inner fin therebetween, or each of the first heat transfer plates and the second heat transfer plates has a corrugated heat transfer surface,
wherein each of the adjacent holes is provided with a circumferential wall in a thickness direction around a circumferential edge thereof, and the circumferential wall is provided with a flange on a front surface side thereof,
wherein the flange provided to each of the first heat transfer plates and the second heat transfer plates is joined to a rear surface of one of the first heat transfer plates and the second heat transfer plates adjacent to each of the first heat transfer plates and the second heat transfer plates,
wherein a bypass passage and a main passage are formed upstream of the first passages and the second passages between adjacent ones of the first heat transfer plates and the second heat transfer plates, with the bypass passage allowing the first fluid flowing from the inflow port of the first fluid or the second fluid flowing from the inflow port of the second fluid to pass a side farther than a corresponding one of the adjacent holes while spreading in a vertical direction in the front view and then flow into the inner fin or the corrugated heat transfer surface, and the main passage allowing the first fluid flowing from the inflow port of the first fluid or the second fluid flowing from the inflow port of the second fluid to directly flow toward the inner fin or the corrugated heat transfer surface without routing through the bypass passage,
wherein a flat space is formed around an entire circumference of each of the adjacent holes, and the first fluid or the second fluid flowing through the main passage and the first fluid or the second fluid flowing through the bypass passage merge in the space between the circumferential wall and the inner fin or the corrugated heat transfer surface, and
wherein a distance between the inner fin or the corrugated heat transfer surface and each of the passage holes is shorter than a distance between the inner fin or the corrugated heat transfer surface and each of the adjacent holes.

2. The plate heat exchanger of claim 1 , wherein a gap between the circumferential wall of each of the adjacent holes and the inner fin or the corrugated heat transfer surface has a length equal to or greater than three times a height of the circumferential wall.

3. The plate heat exchanger of claim 1 , wherein the flange is provided toward outside of the circumferential wall.

4. The plate heat exchanger of claim 1 , wherein the flange is provided toward inside of the circumferential wall.

5. The plate heat exchanger of claim 1 , wherein a rear surface of each of the first heat transfer plates and the flange of a corresponding one of the second heat transfer plates are joined together, and a rear surface of each of the second heat transfer plates and the flange of a corresponding one of the first heat transfer plates are joined together.

6. The plate heat exchanger of claim 1 , wherein a merging passage is formed downstream of the first passages and the second passages between adjacent ones of the first heat transfer plates and the second heat transfer plates to merge flows of the first fluid flowing through the first passages or flows of the second fluid flowing through the second passages.

7. The plate heat exchanger of claim 1 , wherein each of the first heat transfer plates and the second heat transfer plates is provided with a plurality of projections projecting from a rear surface side thereof toward a front surface side thereof around each of the adjacent holes.

8. The plate heat exchanger of claim 1 , wherein each of the first heat transfer plates and the second heat transfer plates is provided with a plurality of projections projecting from a rear surface side thereof toward a front surface side thereof around each of the passage holes.

9. The plate heat exchanger of claim 7 , wherein in a front view of each of the plurality of projections, each of the plurality of projections has one of a circular shape, a stagnation preventing shape, an oval shape, a triangular shape, a quadrangular shape, and a circular arc shape or a combination of a plurality of shapes selected therefrom.

10. The plate heat exchanger of claim 1 , wherein a plurality of slit portions are provided around a circumferential edge of each of the passage holes to form a slit between adjacent ones of the plurality of slit portions.

11. The plate heat exchanger of claim 10 , wherein the plurality of slit portions are provided to project from the circumferential edge of each of the passage holes toward a front surface side of each of the passage holes and then toward outside of each of the passage holes.

12. The plate heat exchanger of claim 10 , wherein the plurality of slit portions are provided from outside of the circumferential edge of each of the passage holes toward inside of each of the passage holes.

13. The plate heat exchanger of claim 10 , wherein in a front view of each of the plurality of slit portions, each of the plurality of slit portions has one of a circular arc shape, an oval shape, a triangular shape, a quadrangular shape, and a trapezoidal shape or a combination of a plurality of shapes selected therefrom.

14. The plate heat exchanger of claim 1 , wherein the inn

Assignees

• Mitsubishi Electric Corp

Inventors

• Sun Faming
• Yoshimura Susumu
• Yoneda Norihiro
• Matsumoto Takashi
• Ito Daisuke

Classifications

• F28F3/06 Primary

  the means being attachable to the element · CPC title

• F28F3/02

  Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations (F28F3/08 takes precedence) · CPC title

• F28F3/025

  the means being corrugated, plate-like elements · CPC title

• F28D9/02 Primary

  the heat-exchange media travelling at an angle to one another (F28D9/04 takes precedence) · CPC title

• F28F2225/04

  for conduits · CPC title