Spraying tube device and heat exchanger using the same

Patent metadata

Field	Value
Publication number	US-9314802-B2
Application number	US-201013822321-A
Country	US
Kind code	B2
Filing date	Sep 13, 2010
Priority date	Sep 13, 2010
Publication date	Apr 19, 2016
Grant date	Apr 19, 2016

Abstract

Disclosed is a spraying tube device capable of, even in a case where a spray solution having low latent heat is used in a falling film type evaporator, uniformly spraying the spray solution to a heat-transfer tube, and a heat exchanger using the spraying tube device. The spraying tube device includes: a spraying tube configured to eject a spray solution M upward through ejection holes arranged along a tube axis C; a cover arranged above the spraying tube and configured to receive the ejected spray solution M and cause the spray solution M to flow through a space S between the cover and the spraying tube to flow downward on an outer surface of the spraying tube, and fins configured to uniformize in a tube axis C direction a distribution of the spray solution M having flowed downward from the cover.

First claim

The invention claimed is:

1. A spraying tube device comprising:
a spraying tube configured to eject a spray solution upward through a plurality of ejection holes arranged at a top most portion of the spraying tube along a tube axis;
a cover arranged above the spraying tube so as not to contact an outer surface of the spraying tube and configured to receive the ejected spray solution and cause the spray solution to flow through a space between nail portions of the cover and the spraying tube to flow downward on an outer surface of the spraying tube; and
a uniformizing structure configured to uniformize in a tube axis direction a distribution of the spray solution having flowed downward from the nail portions of the cover, wherein:
the cover has an inverted U-shaped cross section perpendicular to a longitudinal direction along the tube axis and includes cutout portions and the nail portions, the cutout portions being each formed by cutting out the cover upward from a lower end edge of each of both side walls of the cover and being arranged at a predetermined pitch along the longitudinal direction, the nail portions being each formed between an adjacent cutout portions; and
a width of each of the cutout portions along the longitudinal direction at the lower end edge of each of the side walls is larger than a width of each of the nail portions.

2. The spraying tube device according to claim 1 , wherein the uniformizing structure is constituted by a depression-projection portion formed on a surface of the spraying tube and configured to cause the spray solution to spread in a direction parallel to the tube axis direction.

3. The spraying tube device according to claim 1 , wherein the width of the cutout portion at the lower end edge is two to six times the width of the nail portion.

4. The spraying tube device according to claim 1 , wherein:
the cutout portion gradually increases in width as it extends downward; and
a depth of the cutout portion in a direction perpendicular to the lower end edge is 0.5 to 1.2 times the width of the cutout portion at the lower end edge.

5. A heat exchanger comprising:
the spraying tube device according to claim 4 , and
a heat-transfer tube having an outer surface configured to receive the spray solution dropped from the uniformizing structure, the heat-transfer tube being configured to perform heat exchange between the spray solution and another fluid flowing through an inside of the heat-transfer tube.

6. A heat exchanger comprising:
the spraying tube device according to claim 2 , and
a heat-transfer tube having an outer surface configured to receive the spray solution dropped from the uniformizing structure, the heat-transfer tube being configured to perform heat exchange between the spray solution and another fluid flowing through an inside of the heat-transfer tube.

7. The spraying tube device according to claim 1 , wherein the uniformizing structure is arranged at a lower portion of the spraying tube and includes a plurality of fins arranged along the tube axis direction and facing downward.

8. A heat exchanger comprising:
the spraying tube device according to claim 1 , and
a heat-transfer tube having an outer surface configured to receive the spray solution dropped from the uniformizing structure, the heat-transfer tube being configured to perform heat exchange between the spray solution and another fluid flowing through an inside of the heat-transfer tube.

9. A heat exchanger comprising:
the spraying tube device according to claim 3 , and
a heat-transfer tube having an outer surface configured to receive the spray solution dropped from the uniformizing structure, the heat-transfer tube being configured to perform heat exchange between the spray solution and another fluid flowing through an inside of the heat-transfer tube.

10. The spraying tube device according to claim 7 , wherein:
the fins are lined up in two rows parallel to the tube axis direction;
the fins are arranged at a constant pitch; and
one row of the fins and the other row of the fins are shifted from each other by a half pitch along the tube axis direction.

11. A heat exchanger comprising:
the spraying tube device according to claim 10 ; and
a single heat-transfer tube having an outer surface configured to receive the spray solution dropped from the fins lined up in two rows, the single heat-transfer tube being configured to perform heat exchange between the spray solution and another fluid flowing through an inside of the single heat-transfer tube.

12. A heat exchanger comprising:
the spraying tube device according to claim 10 , and
a heat-transfer tube having an outer surface configured to receive the spray solution dropped from the uniformizing structure, the heat-transfer tube being configured to perform heat exchange between the spray solution and another fluid flowing through an inside of the heat-transfer tube.

13. The spraying tube device according to claim 1 , wherein the uniformizing structure is a spreading pipe arranged at a lower portion of the spraying tube in parallel with the spraying tube and including depressions and projections on a surface of the spreading pipe, the depressions and projections causing the spray solution to spread in a direction parallel to the tube axis direction.

14. A heat exchanger comprising:
the spraying tube device according to claim 7 , and
a heat-transfer tube having an outer surface configured to receive the spray solution dropped from the uniformizing structure, the heat-transfer tube being configured to perform heat exchange between the spray solution and another fluid flowing through an inside of the heat-transfer tube.

15. A heat exchanger comprising:
the spraying tube device according to claim 13 , and
a heat-transfer tube having an outer surface configured to receive the spray solution dropped from the uniformizing structure, the heat-transfer tube being configured to perform heat exchange between the spray solution and another fluid flowing through an inside of the heat-transfer tube.

16. The spraying tube device according to claim 1 , wherein a vertical line passing through a center of the spraying tube passes through each of the plurality of ejection holes arranged at the top most portion of the spraying tube along the tube axis.

17. The spraying tube device according to claim 1 , wherein the cover is further configured to cause spray solution to flow downward on an inner surface of a side of the cover to gather the spray solution at tip ends of the nail portions.

Assignees

• Okumura Takeshi
• Miyake Naoki
• Takemura Tadashi
• Takemura Kyoko
• Kawasaki Heavy Ind Ltd

Inventors

• Okumura Takeshi
• Miyake Naoki
• Takemura Tadashi

Classifications

• F25B39/028

  having distributing means · CPC title

• B05B1/265 Primary

  the liquid or other fluent material being symmetrically deflected about the axis of the nozzle · CPC title

• F28D3/02 Primary

  with tubular conduits · CPC title

• F28D3/04

  Distributing arrangements · CPC title

• B05B7/0012

  Apparatus for achieving spraying before discharge from the apparatus · CPC title