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1. US20150053384 - HEAT EXCHANGER HEADER, HEAT EXCHANGER HAVING THE HEAT EXCHANGER HEADER, REFRIGERATION CYCLE APPARATUS AND AIR-CONDITIONING APPARATUS

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[ EN ]

Claims

1. A heat exchanger header for a heat exchanger in which a refrigerant is flowed in parallel through a plurality of heat transfer tubes disposed in parallel,
the heat exchanger header being configured to distribute the refrigerant to the plurality of heat transfer tubes in parallel by effect of surface tension,
wherein a plurality of through-holes to which ends of the plurality of heat transfer tubes are connected are arranged side by side in a longitudinal direction,
wherein at least one chamber communicating with the plurality of through-holes and serving as a refrigerant flow passage is formed, and
wherein each of the plurality of through-holes is either of an inlet side through-hole and an outlet side through-hole to which a refrigerant inlet side end and a refrigerant outlet side end, respectively, of the plurality of heat transfer tubes are connected, and in a part of the chamber that faces the inlet side through-holes, a plurality of grooves extending in the longitudinal direction of the header are formed in a lateral direction perpendicular to the longitudinal direction.
2. The heat exchanger header of claim 1,
wherein the at least one chamber comprises a plurality of chambers separated in the longitudinal direction of the header, each of the plurality of chambers is classified as any one of an inflow chamber into which the refrigerant from outside flows, a U-turn chamber serving as a U-turn flow passage, and an outflow chamber from which refrigerant flows to the outside,
wherein through-holes communicating with the inflow chamber are all inlet side through-holes, and the plurality of grooves are formed over an entire length in the longitudinal direction of the part forming the inflow chamber,
wherein through-holes communicating with the U-turn chamber are divided into an inlet side through-hole group and an outlet side through-hole group, and the plurality of grooves are formed in a part facing the inlet side through-hole group, and
wherein through-holes communicating with the outflow chamber are all outlet side through-holes, and the plurality of grooves are not formed in a part forming the outflow chamber.
3. The heat exchanger header of claim 2, wherein the plurality of grooves are formed by gaps between a plurality of protruding protrusions, and every two of the plurality of protrusions formed in the U-turn chamber that are adjacent in the lateral direction differ in a position of an end closest to a border between the inlet side through-hole group and the outlet side through-hole group.
4. The heat exchanger header of claim 1, wherein the plurality of grooves are formed by gaps between a plurality of protruding protrusions, and every adjacent two of the plurality of protrusions differ in height.
5. The heat exchanger header of claim 4, wherein heights of the plurality of protrusions are alternately large and small in the lateral direction.
6. The heat exchanger header of claim 4, wherein heights of the plurality of protrusions are configured to be increasingly large toward a central part in the lateral direction.
7. The heat exchanger header of claim 1, wherein the header includes a header main body that has a box-like shape with one side open and whose bottom surface facing the opening has the plurality of through-holes formed therein, and a lid body formed in a plate-like shape covering the opening.
8. The heat exchanger header of claim 7, wherein the grooves are formed in the lid body.
9. A heat exchanger comprising a heat exchanger header in which refrigerant is flowed in parallel through a plurality of heat transfer tubes disposed in parallel, the heat exchanger header being configured to distribute the refrigerant to the plurality of heat transfer tubes in parallel by effect of surface tension,
wherein a plurality of through-holes to which ends of the plurality of heat transfer tubes are connected are arranged side by side in a longitudinal direction,
wherein at least one chamber communicating with the plurality of through-holes and serving as a refrigerant flow passage is formed, and
wherein each of the plurality of through-holes is an inlet side through-hole or an outlet side through-hole to which a refrigerant inlet side end or a refrigerant outlet side end of the plurality of heat transfer tubes is connected, and in a part of the chamber that faces the inlet side through-holes, a plurality of grooves extending in the longitudinal direction of the header are formed in a lateral direction perpendicular to the longitudinal direction.
10. A heat exchanger comprising, in an air passing direction, at least two heat exchanging units including a pair of the heat exchanger headers of claim 2 spaced from each other in a direction perpendicular to the air passage direction, a plurality of heat transfer tubes disposed in parallel between the pair of heat exchanger headers and both ends of which are connected to the plurality of through-holes of the pair of heat exchanger headers, and a plurality of fins disposed such that air passes in the air passage direction, wherein the heat exchanging units are connected by an inter-line pipe, and a refrigerant flow passage is formed in which the refrigerant flows through the plurality of heat transfer tubes of the heat exchanging unit on an upstream side in the air passage direction, from the inflow chamber to the outflow chamber while making a U-turn in the U-turn chamber, then flows through the inter-line pipe into the heat exchanging unit on a downstream side in the air passage direction, and flows from the inflow chamber to the outflow chamber of the heat exchanger header while making a U-turn in the U-turn chamber, and
wherein when the heat exchanger is used as an evaporator, a number of refrigerant passes of the refrigerant flowing through the heat exchanging unit on the upstream side is less than a number of refrigerant passes of the refrigerant flowing through the heat exchanging unit on the downstream side.
11. The heat exchanger of claim 9, wherein the heat transfer tubes are flat tubes having a plurality of through-holes serving as refrigerant flow passages.
12. A refrigeration cycle apparatus comprising a heat exchanger comprising a heat exchanger header in which refrigerant is flowed in parallel through a plurality of heat transfer tubes disposed in parallel,
the heat exchanger header being configured to distribute the refrigerant to the plurality of heat transfer tubes in parallel by effect of surface tension, wherein
a plurality of through-holes to which ends of the plurality of heat transfer tubes are connected are arranged side by side in a longitudinal direction,
at least one chamber communicating with the plurality of through-holes and serving as a refrigerant flow passage is formed, and
each of the plurality of through-holes is an inlet side through-hole or an outlet side through-hole to which a refrigerant inlet side end or a refrigerant outlet side end of the plurality of heat transfer tubes is connected, and in a part of the chamber that faces the inlet side through-holes, a plurality of grooves extending in the longitudinal direction of the header are formed in a lateral direction perpendicular to the longitudinal direction.
13. An air-conditioning apparatus comprising a heat exchanger comprising a heat exchanger header in which refrigerant is flowed in parallel through a plurality of heat transfer tubes disposed in parallel, the heat exchanger comprising a heat exchange header, the heat exchanger header being configured to distribute the refrigerant to the plurality of heat transfer tubes in parallel by effect of surface tension, wherein
a plurality of through-holes to which ends of the plurality of heat transfer tubes are connected are arranged side by side in a longitudinal direction,
at least one chamber communicating with the plurality of through-holes and serving as a refrigerant flow passage is formed, and
each of the plurality of through-holes is an inlet side through-hole or an outlet side through-hole to which a refrigerant inlet side end or a refrigerant outlet side end of the plurality of heat transfer tubes is connected, and in a part of the chamber that faces the inlet side through-holes, a plurality of grooves extending in the longitudinal direction of the header are formed in a lateral direction perpendicular to the longitudinal direction.