JPWO2021117107A1 - Distributor, heat exchanger with distributor and air conditioner with the heat exchanger - Google Patents

Abstract

Provided is a distribution device having a size smaller than that of the distribution device (main header and sub-header) of Patent Document 1 and capable of equalizing the distribution of the refrigerant to each heat transfer tube. The distribution device is connected to a distribution unit that distributes the refrigerant to each of the plurality of heat transfer tubes arranged in the vertical direction and one end of each of the front plurality of heat transfer tubes, and distributes the refrigerant in the distribution unit. A refrigerant flow path portion in which a plurality of flow paths for sending to each of the plurality of heat transfer tubes is formed is provided. The distribution unit includes a first plate having at least one refrigerant inlet, and a second plate having at least one opening having an opening area larger than the opening area of the refrigerant inlet of the first plate. A third plate having a collision area provided at a position facing the refrigerant inlet and a plurality of holes provided at positions corresponding to each of the plurality of flow paths is provided.

Description

The present invention relates to a distributor, a heat exchanger equipped with a distributor, and an air conditioner equipped with the heat exchanger.

In the heat exchanger of an air conditioner, it is important to evenly distribute the refrigerant to the entire heat exchanger in order to maximize the heat exchange efficiency.
The refrigerant is sent to each heat transfer tube constituting the heat exchanger through the pipe. The pipe generally has a main pipe and a plurality of branch pipes branched from the main pipe, and the branch pipe is connected to the heat transfer pipe. In this configuration, it is necessary to evenly distribute the refrigerant from the main pipe to each branch pipe.
However, as the number of branch pipes corresponding to the number of heat transfer tubes is provided, the size of the device becomes large, which is contrary to the demand for compactness of the device.
Further, in order to make the device compact, there is also a configuration in which a branch pipe is not provided and a header connected to the main pipe is connected to each heat transfer pipe. In this configuration, it is necessary to evenly distribute the refrigerant from the header in which the refrigerant flow path is formed to each heat transfer tube, but due to the connection structure between the heat transfer tubes arranged in series in the longitudinal direction of the header and the header, the header It is difficult to evenly distribute the refrigerant from.

In Patent Document 1, a refrigerant flowing in a horizontal direction is made to collide with a collision portion to change the flow direction of the refrigerant upward to flow the refrigerant into the main header chamber, branch horizontally from the main header chamber, and move up and down. A structure for distributing a refrigerant to a plurality of juxtaposed sub-header chambers is disclosed.
Further, Patent Document 1 discloses a configuration further provided with a tubular structure slidable in the vertical direction, a throttle plate for adjusting the flow rate of the upward refrigerant, and the like.

Japanese Unexamined Patent Publication No. 2017-133820

Patent Document 1 has a combination structure of a main header and a sub-header, and has a problem that the device size becomes large.

The present invention provides a distribution device that distributes the refrigerant to each heat transfer tube in a size smaller than the distribution device (main header and sub-header) of Patent Document 1 and enables even distribution of the refrigerant.
It also provides a heat exchanger equipped with the distributor.
It also provides an air conditioner equipped with the heat exchanger.

The distribution device of the present invention is
A distribution unit that distributes the refrigerant to each of the multiple heat transfer tubes arranged in the vertical direction,
A refrigerant flow path portion, which is connected to one end of each of the preceding plurality of heat transfer tubes and has a plurality of flow paths for sending the refrigerant distributed by the distribution section to each of the plurality of heat transfer tubes. Be prepared.
The distribution unit
A first plate with at least one refrigerant inlet,
A second plate having at least one opening having an opening area larger than the opening area of the refrigerant inlet of the first plate, and a second plate.
A third plate having a collision region provided at a position facing the refrigerant inlet and a plurality of holes provided at positions corresponding to each of the plurality of flow paths is provided.
The refrigerant flow path portion is
It comprises at least one plate having a plurality of openings forming the plurality of flow paths.
The at least one opening of the second plate is arranged between the first plate and the third plate to form a main flow path for feeding the refrigerant into the refrigerant flow path portion.

According to the present invention, since the equalization of the refrigerant distribution can be improved, the heat exchange efficiency and the energy efficiency can be improved, and the amount of the refrigerant used can be reduced.

It is a schematic diagram of the air conditioner provided with the distribution device which concerns on Embodiment 1. FIG. It is a schematic diagram of the distribution device and the heat exchanger which concerns on Embodiment 1. FIG. It is a top view for demonstrating the component of the distribution apparatus which concerns on Embodiment 1. FIG. It is a top view for showing the plurality of holes of a third plate. It is a top view for showing the plurality of holes of the third plate of another embodiment. It is a top view for showing the plurality of holes of the third plate of another embodiment. It is a top view for showing a plurality of openings of a refrigerant flow path part. It is a top view for showing the plurality of openings of the refrigerant flow path part of another embodiment. It is a top view for showing the plurality of openings of the refrigerant flow path part of another embodiment. It is a top view for demonstrating the distribution part of another embodiment. It is a top view for demonstrating the distribution part of another embodiment. It is a top view for demonstrating the component of the distribution apparatus which concerns on Embodiment 2. FIG. It is a schematic diagram for demonstrating the multistage distribution apparatus which concerns on Embodiment 3.

[First Embodiment]
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same reference numerals are given to the common parts in each figure, and duplicate description is omitted.
FIG. 1 is a block diagram of a refrigerating cycle of an air conditioner according to the first embodiment of the present invention.
As shown in FIG. 1, the air conditioner 100 is composed of an outdoor unit 101 installed outdoors (non-air-conditioned space) on the heat source side and an indoor unit 108 installed indoors (air-conditioned space) on the user side. , Connected by connection pipes 112a, 112b.

[Air conditioner 100]
The outdoor unit 101 includes a compressor 102, a four-way valve 103, an outdoor heat exchanger 104, an outdoor fan motor 105, an outdoor fan 106, and a throttle device 107, and the indoor unit 108 includes an indoor heat exchanger 109. , The indoor fan motor 110 and the indoor fan 111 are provided.

The operation of each element of the air conditioner 100 will be described by taking the operation during the cooling operation as an example.
During the cooling operation, the refrigerant flows in the direction of the solid arrow in FIG. First, the high-temperature, high-pressure gas refrigerant discharged from the compressor 102 flows to the outdoor heat exchanger 104 after passing through the four-way valve 103, and is condensed by radiating heat to the outside air in the outdoor heat exchanger 104, resulting in high pressure. It becomes a liquid refrigerant. This liquid refrigerant is decompressed by the action of the throttle device 107, becomes a low-temperature low-pressure gas-liquid two-phase state, and flows to the indoor unit 108 through the connection pipe 112a. The gas-liquid two-phase refrigerant contained in the indoor unit 108 evaporates by absorbing the heat of the indoor air in the indoor heat exchanger 109, whereby indoor cooling is realized. The gas refrigerant evaporated in the indoor unit 108 returns to the outdoor unit 101 through the connection pipe 112b, and is compressed again by the compressor 102 through the four-way valve 103. This is the refrigeration cycle during cooling operation.

During the heating operation, the refrigerant flow path is switched by the four-way valve 103, and the refrigerant flows in the direction of the broken line arrow in FIG. First, the high-temperature, high-pressure gas refrigerant discharged from the compressor 102 flows to the indoor unit 108 through the four-way valve 103 and the connection pipe 112b. The high-temperature gas refrigerant that has entered the indoor unit 108 is dissipated to the indoor air by the indoor heat exchanger 109 to realize indoor heating. At this time, the gas refrigerant condenses and becomes a high-pressure liquid refrigerant. After that, the high-pressure liquid refrigerant flows to the outdoor unit 101 through the connection pipe 112a. The high-pressure liquid refrigerant that has entered the outdoor unit 101 is decompressed by the action of the throttle device 107, becomes a low-temperature low-pressure gas-liquid two-phase state, flows to the outdoor heat exchanger 104, and evaporates by absorbing the heat of the outdoor air. , Becomes a gas refrigerant. This gas refrigerant passes through the four-way valve 103 and is then compressed again by the compressor 102. This is the refrigeration cycle during heating operation.
As described above, the directions of the refrigerant flows in the outdoor heat exchanger 104 and the indoor heat exchanger 109 are opposite in the cooling operation and the heating operation.
Examples of the refrigerant include R32, R410A and the like.

[Heat exchanger]
FIG. 2 is a schematic view of the outdoor heat exchanger 109 or the indoor heat exchanger 104 of the air conditioner 100.
As shown in FIG. 2, the outdoor heat exchanger 109 or the indoor heat exchanger 104 includes a distribution device 50 on the inflow side on the right side in the figure for distributing the refrigerant and a merging device 60 on the outflow side on the left side in the figure for merging the refrigerant. Along with connecting these distribution devices 50 and the merging device 60, a plurality of flat tubes 2 (heat transfer tubes) through which a refrigerant for exchanging heat with air flows inside, and the flat tubes 2 are brazed to the transfer thereof. A plurality of fins 1 for expanding the heat area are provided.

As shown in FIG. 2, the flow direction of the refrigerant (from right to left in the figure) and the flow direction of air (direction perpendicular to the drawing paper) are orthogonal to each other, and the refrigerant flowing in the flat tube 2 is flat. Efficient heat exchange is realized by exchanging heat between the air flowing between the tubes 2 via the fins 1.
Since the flow of the refrigerant is reversed between the cooling operation and the heating operation, reference numeral 60 serves as a distribution unit device, and reference numeral 50 functions as a merging device.

[Distributor]
The distribution device 50 of the first embodiment will be described with reference to FIGS. 3, 4A, and 5A.
The distribution device 50 includes a first introduction plate 501, a second introduction plate 502, a distribution unit 51, and a refrigerant flow path unit 52.
The first introduction plate 501 has a refrigerant introduction port 5011. A pipe for supplying a refrigerant (not shown) is connected to the introduction port 5011, and the refrigerant is introduced. The second introduction plate 502 has a first introduction path 5021 and a second introduction path 5022 communicating with the introduction port 5011. The refrigerant introduced from the introduction port 5011 is sent to the distribution unit 51 through the first introduction path 5021 and the second introduction path 5022.
In the present embodiment, the introduction side of the refrigerant is composed of two first and second introduction plates 501 and 502, but may be composed of three or more. By reducing the thickness of the entire plate, the distribution device can be made compact.

[Distributor]
The distribution unit 51 distributes the refrigerant to each of the plurality of heat transfer tubes 2 arranged in the vertical direction. The distribution unit 51 has a first plate 511, a second plate 512, and a third plate 513.
The first plate 511 has a first refrigerant inlet 5111 formed in the lower portion and a second refrigerant inlet 5112 formed in the middle portion. The first refrigerant inlet 5111 and the second refrigerant inlet 5112 are formed in the thickness direction of the plate.
In the present embodiment, the "lower part" is between the lowermost first-stage hole 5131 and the lowermost second-stage hole 5132, which will be described later. In the present embodiment, the "middle portion" is between the 9th-stage hole 5139 and the 10th-stage hole 51310, which will be described later, when viewed from the bottom to the top.

The second plate 512 has a first opening 5121 communicating with the first refrigerant inlet 5111 and a second opening 5122 formed above the first opening 5121 and communicating with the second refrigerant inlet 5112. The first opening 5121 and the second opening 5122 are physically separated. The first opening 5121 has an area larger than the area of the first refrigerant inlet 5111, and is formed in the thickness direction of the plate. The second opening 5122 has an area larger than the area of the second refrigerant inlet 5112, and is formed in the thickness direction of the plate.

The third plate 513 has a plurality of holes 5131 to 51316 provided at positions corresponding to the respective positions of the heat transfer tubes 2 in order to distribute the refrigerant toward each of the plurality of heat transfer tubes 2 arranged in the vertical direction. Have. The plurality of holes 5131 to 51316 are provided at positions corresponding to each of the plurality of channels (5211 to 52116, 5221 to 52216, 5231 to 52316, 5241 to 52416,) of the refrigerant flow path portion 52.
The third plate 513 has a first collision region P1 provided at a position facing the first refrigerant inlet 5111 and a second collision region P2 provided at a position facing the second refrigerant inlet 5112. The first and second collision regions P1 and P2 are regions without holes.

The first opening 5121 of the second plate 512 is arranged between the first plate 511 and the third plate 513, and is provided with a refrigerant through a plurality of lower holes (5131 to 5138) of the third plate 513. A first main flow path for sending the refrigerant to the flow path portion 52 (lower openings 5211 to 5218) is formed.
By arranging the second opening 5122 between the first plate 511 and the third plate 513, the refrigerant flow path portion 52 (5139 to 51316) in the upper part of the third plate 513 (5139 to 51316) is provided. A second main flow path for feeding the refrigerant to the upper opening 5219 to 52116) is formed.
The refrigerant is distributed to the plurality of holes in the lower stage in the first main flow path, and the refrigerant is distributed to the plurality of holes in the upper stage in the second main flow path.

The refrigerant flowing in from the first refrigerant inlet 5111 collides with the first collision region P1 of the third plate 513, changes the flow from the horizontal direction to the vertical direction, and is inside the first main flow path (inside the first opening 5121). The refrigerant is guided to a plurality of holes (5131 to 5138) in the lower stage of the third plate 513.
The refrigerant flowing in from the second refrigerant inlet 5112 collides with the second collision region P2 of the third plate 513, changes the flow from the horizontal direction to the vertical direction, and is inside the second main flow path (inside the second opening 5122). The refrigerant is guided to a plurality of holes (5139 to 51316) in the upper part of the third plate 513.

As shown in FIG. 4A, in the present embodiment, the plurality of holes (5131 to 51316) are all configured with the same opening area. The plurality of holes (5131 to 51316) are formed in 16 steps in the vertical direction according to the position of each heat transfer tube 2. Each hole (5131 to 51316) is formed as a pair of two holes parallel to the lateral direction (width direction) of the plate.

[Refrigerant flow path]
The refrigerant flow path portion 52 has a first distribution plate 521, a second distribution plate 522, a third distribution plate 523, and a fourth distribution plate 524. The first, second, third, and fourth distribution plates 521, 522, 523, and 524 have a plurality of flow paths at positions (16 steps) corresponding to the positions (16 steps) of the plurality of holes 5131 to 51316, respectively. It has a plurality of openings (5211 to 52116, 5221 to 52216, 5231 to 52316, 5241 to 52416).
One end of each of the plurality of heat transfer tubes 2 is connected to the plurality of openings (5241 to 52416) of the fourth distribution plate 524.

As shown in FIG. 5A, in the present embodiment, the plurality of openings (5211 to 52116, 5221 to 52216, 5231 to 52316, 5241 to 52416) all have the same opening area. The plurality of openings (5211 to 52116, 5221 to 52216, 5231 to 52316, 5241 to 52416) are formed in 16 steps in the vertical direction according to the position of each heat transfer tube 2.

[Another Embodiment: Multiple holes in the third plate]
4B and 4C show an example of the arrangement, shape, and size of a plurality of holes of the third plate 513 of another embodiment.
In FIG. 4B, the first-stage holes 5131 and the ninth-stage holes 5139 under the first and second collision regions P1 and P2 are one and have a smaller opening area than the other holes. The holes 5138 in the 8th stage and the holes 51316 in the 16th stage, which are the farthest from the first and second collision areas P1 and P2, are one, and the holes 5131 in the first stage and the holes 5139 in the 9th stage. Larger opening area and smaller opening area than other holes. The second-stage hole 5132 and the tenth-stage hole 51310 are one and have a horizontally long shape in the lateral direction (width direction). The holes 5137 in the seventh stage and the holes 51315 in the fifteenth stage are one, and have a horizontally long shape in the lateral direction (width direction). The opening area of the 4th and 5th stage holes (5134, 5135) in the intermediate region located between the first collision region P1 and the most distal 8th stage hole 5138 is the third stage. It is larger than the opening area of the holes (5133, 5136) in the sixth stage. The opening area of the 12th and 13th stage holes (51312, 51313) in the intermediate region located between the second collision region P2 and the most distal 16th stage hole 51316 is the 11th stage. It is larger than the opening area of the 14th stage hole (51311, 51314).
In other words, the following magnitude relationship is established.
(1) Opening area of 1 hole in 2nd and 7th stages ≧ Total opening area of 2 holes in 4th and 5th stages> Total opening area of 2 holes in 3rd and 6th stages> 8th stage Opening area of 1 hole of eye> Opening area of 1 hole of 1st stage (2) Opening area of 1 hole of 10th and 15th stages ≧ Total opening of 2 holes of 12th and 13th stages Area> Total opening area of 2 holes in 11th and 14th stages> Opening area of 1 hole in 16th stage> Opening area of 1 hole in 9th stage or
(3) Total opening area of 2 holes in 4th and 5th stages ≧ Opening area of 1 hole in 2nd and 7th stages> Total opening area of 2 holes in 3rd and 6th stages> 8th stage Opening area of 1 hole of eye> Opening area of 1 hole of 1st stage (4) Total opening area of 2 holes of 12th and 13th stages ≧ Opening of 1 hole of 10th and 15th stages Area> Total opening area of 2 holes in 11th and 14th stages> Opening area of 1 hole in 16th stage> Opening area of 1 hole in 9th stage

The third plate 513 in FIG. 4C and the third plate 513 in FIG. 4B are different from each other in the holes 5132 in the second stage and the holes 51310 in the tenth stage. In FIG. 4C, the second-stage hole 5132 and the tenth-stage hole 51310 have two holes parallel to each other in the lateral direction (width direction), and the two holes have the same opening area. The opening area of the second-stage hole 5132 and the tenth-stage hole 51310 is smaller than the opening area of the third-stage and eleventh-stage holes (5133, 51311).
In other words, the following magnitude relationship is established.
(1) Total opening area of 2 holes in 4th and 5th stages> Opening area of 1 hole in 7th stage> Total opening area of 2 holes in 3rd and 6th stages> 2 in 2nd stage Total opening area of the holes> Opening area of the 1st hole in the 8th stage> Opening area of the 1st hole in the 1st stage (2) Total opening area of the 2 holes in the 12th and 13th stages> 15th stage Opening area of 1 hole of eye> Total opening area of 2 holes of 11th and 14th steps> Total opening area of 2 holes of 10th step> Opening area of 1 hole of 16th step> Opening area of one hole in the 9th stage

[Effect of another embodiment]
By making the opening area of the plurality of holes in the intermediate region located between the collision region and the most distal hole larger than the opening area of the other holes, the inflow into the holes located in the intermediate region can be promoted. ..
Further, by making the holes of the first, eighth, ninth, and 16th stages of the latest positions smaller than the other holes on the vertical side surface of the opening forming the main flow path, the refrigerant hits the side surface. The inflow of the refrigerant that changes and stays can be controlled (suppressed).

[Another Embodiment: Multiple openings of the refrigerant flow path portion]
5B and 5C show an example of a plurality of openings of the refrigerant flow path portion 52 of another embodiment.
In the refrigerant flow path portion 52 of FIG. 5B, the opening areas of the plurality of openings (5211 to 52116, 5231 to 52316) of the first distribution plate 521 and the third distribution plate 523 are the second distribution plate 522 and the fourth distribution plate. It is larger than the opening area of the plurality of openings (5221-52216) of 524.

In the refrigerant flow path portion 52 of FIG. 5C, the opening areas of the plurality of openings (5221-52216, 5231 to 52316) of the second distribution plate 522 and the third distribution plate 523 are the first distribution plate 521 and the fourth distribution plate. It is larger than the opening area of the plurality of openings (5211 to 52116, 5241 to 52416) of 524.
As another embodiment, the number of plates constituting the refrigerant flow path portion 52 is not limited to four, and may be two or three.

[Separate embodiment: Distribution unit]
6A and 6B show an example of the distribution unit 51 of another embodiment.
The distribution section 51 of FIG. 6A includes a first plate 514, a second plate 515, and a third plate 516.
The first plate 514 has a main refrigerant inlet 5141 for inflowing the refrigerant and an auxiliary refrigerant inlet 5142 arranged below the main refrigerant inlet 5141. The opening area of the auxiliary refrigerant inlet 5142 is the main refrigerant. It is smaller than the opening area of the inflow port 5141.
The second plate 515 has an opening 5151 that communicates with the main refrigerant inlet 5141 and the auxiliary refrigerant inlet 5142.
The third plate 516 has a main collision region P4 provided at a position facing the main refrigerant inlet 5141, an auxiliary collision region P5 provided at a position facing the auxiliary refrigerant inlet 5142, and a plurality of flow paths (and a plurality of flow paths). It has a plurality of holes (5161 to 51616) provided at positions corresponding to each of the openings (5211 to 52116).
The opening 5151 of the second plate 515 is arranged between the first plate 514 and the third plate 516 to form a main flow path for feeding the refrigerant to the refrigerant flow path portion 52.
The main collision region P4 is provided in the intermediate region of the third plate 516 without holes, and the auxiliary collision region P5 is provided in the lower part of the third plate 516 without holes. In the present embodiment, the main collision region P4 is provided between the 9th stage hole 3169 and the 10th stage hole 31610, and the auxiliary collision region P5 is the first stage hole 3161 and the second stage hole 3161. It is provided between the holes 3162 of. In FIG. 6A, the flow passage has 16 steps, but the flow passage is not limited to this, and may be 16 steps or less and 16 steps or more.

The distribution section 51 of FIG. 6B includes a first plate 517, a second plate 518, and a third plate 519.
The first plate 517 has a first main refrigerant inlet 5171 for inflowing the refrigerant and a first auxiliary refrigerant inlet 5172 arranged below the first main refrigerant inlet 5171. The opening area of the first auxiliary refrigerant inlet 5172 is smaller than the opening area of the first main refrigerant inlet 5171.
The first plate 517 is arranged above the first main refrigerant inlet 5171, the second main refrigerant inlet 5173 for inflowing the refrigerant, and the second auxiliary arranged below the second main refrigerant inlet 5173. It has a refrigerant inlet 5174. The opening area of the second auxiliary refrigerant inlet 5174 is smaller than the opening area of the second main refrigerant inlet 5173.
The second plate 518 is provided above the first opening 5181 and the first opening 5181 that communicate with the first main refrigerant inlet 5171 and the first auxiliary refrigerant inlet 5172, and is provided with the second main refrigerant inlet 5173. It has a second opening 5182 that communicates with the second auxiliary refrigerant inlet 5174.
The third plate 519 has a first main collision region P6 provided at a position facing the first main refrigerant inlet 5171 and a first auxiliary collision region P7 provided at a position facing the first auxiliary refrigerant inlet 5172. A second main collision region P8 provided at a position facing the second main refrigerant inlet 5173, a second auxiliary collision region P9 provided at a position facing the second auxiliary refrigerant inlet 5174, and a plurality of flow paths (and It has a plurality of holes (5191 to 51916) provided at positions corresponding to each of the plurality of openings (5211 to 52116).
The first opening 5181 of the second plate 518 is arranged between the first plate 517 and the third plate 519 to form a first main flow path for feeding the refrigerant to the refrigerant flow path portion 52. The second opening 5182 of the second plate 518 is arranged between the first plate 517 and the third plate 519 to form a second flow path for feeding the refrigerant to the refrigerant flow path portion 52.

In this embodiment, the first main collision region P6 is provided between the fourth stage hole 3194 and the fifth stage hole 3195 of the third plate 519 having no holes, and the first auxiliary collision region P7 is. It is provided between the first-stage hole 3191 and the second-stage hole 3192 of the third plate 519 having no hole. The second main collision region P8 is provided between the 12th stage hole 31912 and the 13th stage hole 31913 of the third plate 519 having no holes, and the second auxiliary collision region P9 is the third without holes. It is provided between the 9th step hole 3199 and the 10th step hole 31910 of the plate 519.

[Modified example of the embodiment]
(1) The refrigerant inlet may be formed on the main surface of the rectangular first plate.
(2) The number of refrigerant inlets may be one or two or more, but collision regions corresponding to each may be formed on the third plate.
(3) The rectangular second plate may have a rectangular first opening and a rectangular second opening arranged in series in the longitudinal direction of the rectangular. The sizes of the first and second openings may be the same or different.
(4) In the plurality of holes of the rectangular third plate, the opening area of the holes formed near the collision region is smaller than the opening area of the holes formed farther than the holes. You may.
(5) The opening area of the hole formed in the central region of the rectangular third plate in the longitudinal direction is the opening area formed at both ends of the third plate (or the rectangular opening) in the longitudinal direction. It may be larger than the opening area of the hole.
(6) The opening area of the hole formed in the central region of the rectangular third plate in the longitudinal direction may be smaller than the opening area of the refrigerant inlet.
(7) The opening area of the hole formed at both ends of the rectangular third plate in the longitudinal direction may be smaller than the opening area of the hole formed near the collision region.
(8) The cross-sectional (planar) shape of the hole may be a circle, a rectangle, a polygon, or an irregular shape.
(9) The holes may have the same opening size in the thickness direction of the third plate, and the opening size on the second plate side and the opening size on the refrigerant flow path portion side may be different. For example, the opening size of the hole on the second plate side may be large and the opening size on the refrigerant flow path side may be small, or vice versa.
(10) The shapes or areas of the plurality of holes may all be the same or different.
(11) The plurality of holes formed corresponding to the positions of the heat transfer tubes may be one or two or more.

[Embodiment 2: Distributor]
The distribution device 70 of FIG. 7 has eight openings and holes in the vertical direction, unlike the distribution device 50 of the first embodiment (FIG. 1), which has 16 steps of openings and holes in the vertical direction.
The distribution device 70 includes a first introduction plate 701, a second introduction plate 702, a distribution unit 71, and a refrigerant flow path unit 72.
The first introduction plate 701 has a refrigerant introduction port 7011. A pipe for supplying a refrigerant (not shown) is connected to the introduction port 7011, and the refrigerant is introduced. The second introduction plate 702 has an introduction path 7021 communicating with the introduction port 7011. The refrigerant introduced from the introduction port 7011 is sent to the distribution unit 71 through the introduction path 7021. It should be noted that the first introduction plate 701 and the second introduction plate 702 may not be provided, and the refrigerant supply pipe may be directly connected to the refrigerant inlet 7111 of the distribution unit 71 described later.
The distribution unit 71 has a first plate 711, a second plate 712, and a third plate 713.
The first plate 711 has a refrigerant inlet 7111 formed at the bottom. The lower part (or collision area P10) is between the first-stage hole 7131 and the second-stage hole 7132. The second plate 712 has an opening 7121 that communicates with the refrigerant inlet 7111.
The third plate 713 has a plurality of holes 7131 to 7138 in eight stages. The plurality of holes 7131 to 7138 are provided at positions corresponding to each of the plurality of flow paths of the refrigerant flow path portion 52. The third plate 713 has a collision region P10 at a position facing the refrigerant inlet 7111.
The refrigerant flow path portion 72 has a first distribution plate 721, a second distribution plate 722, a third distribution plate 723, and a fourth distribution plate 724. The first, second, third, and fourth distribution plates 721, 722, 723, and 724 each have a plurality of openings (7211 to 721-) having a plurality of flow paths at positions corresponding to the positions of the plurality of holes 7131 to 51318. 7218, 7222 to 7228, 7231 to 7238, 7241 to 7248).
One end of each of the plurality of heat transfer tubes 2 is connected to the plurality of openings (7241 to 7248) of the fourth distribution plate 724.
For the plurality of holes of the second embodiment, the shapes and sizes of the respective embodiments of FIGS. 4A to 4D can be adopted.

[Simulation analysis of refrigerant distribution flow rate]
A simulation analysis of the distribution flow rate was performed for the above embodiment.
Example 1: Distributing section (FIG. 4A), refrigerant flow path section (FIG. 5A)
Example 2: Distributor (FIG. 4B), Refrigerant flow path (FIG. 5A)
Example 3: Distributor (FIG. 4C), Refrigerant flow path (FIG. 5A)
Example 4: Distributor (FIG. 6B), Refrigerant flow path (FIG. 5A)
Comparative Example 1: Patent Document 1 (Structure of FIG. 2 of JP2017-133820)
Flow rate of refrigerant supplied to the refrigerant inlet: 20 kg / hr
The standard deviation of the distribution flow rate (%) from the first stage to the eighth stage of each hole was obtained, and the difference (Δ) from Comparative Example 1 was obtained.

In the simulation results, all of Examples 1 to 4 were better than Comparative Example 1. In particular, in Examples 3 and 4, the standard deviation was low and the difference Δ was large.

[Embodiment 3: Multistage Distributor]
FIG. 8 shows an example of a multi-stage distribution device in which the distribution device 70 of the second embodiment is arranged in multiple stages. It can be distributed to 8 by the first-stage distribution device 70 on the right side of the drawing, introduced into the eight distribution devices 70 of the second stage, and further distributed to 64 of 8 × 8.
The first-stage distribution device 70 may distribute to 2 or more (preferably 4 or more, more preferably 6 or more), and the second-stage distribution device 70 may distribute to eight.
The configuration is not limited to the configuration in which the second-stage distribution device 70 is connected to the heat transfer tube, and a third-stage or higher distribution device is provided, and the third-stage or higher distribution device is connected to the heat transfer tube. May be good.
By providing the distribution devices in a plurality of stages in this way, it is possible to evenly distribute the refrigerant to many heat transfer tubes with a compact structure without providing a complicated piping structure or header as compared with the conventional case.

1 Fin 2 Flat tube (heat transfer tube)
50 Distributor (Embodiment 1)
51 Distribution section 511 First plate 512 Second plate 513 Third plate 52 Refrigerant flow path section 521 First distribution plate 522 Second distribution plate 523 Third distribution plate 60 Confluence section 70 Distribution device (embodiment 2)
100 Air conditioner 104 Indoor heat exchanger 109 Outdoor heat exchanger P1 First collision area P2 Second collision area

Claims (6)

A distribution unit that distributes the refrigerant to each of the multiple heat transfer tubes arranged in the vertical direction,
A refrigerant flow path portion, which is connected to one end of each of the preceding plurality of heat transfer tubes and has a plurality of flow paths for sending the refrigerant distributed by the distribution section to each of the plurality of heat transfer tubes. Prepare,
The distribution unit
A first plate with at least one refrigerant inlet,
A second plate having at least one opening having an opening area larger than the opening area of the refrigerant inlet of the first plate, and a second plate.
A third plate having a collision region provided at a position facing the refrigerant inlet and a plurality of holes provided at positions corresponding to each of the plurality of flow paths is provided.
The refrigerant flow path portion is
It comprises at least one plate having a plurality of openings forming the plurality of flow paths.
The at least one opening of the second plate is arranged between the first plate and the third plate to form a main flow path for feeding the refrigerant into the refrigerant flow path portion. Distributor. According to claim 1, the opening area of the hole formed near the collision region of the third plate is smaller than the opening area of the hole formed in the central region in the longitudinal direction of the third plate. The distributor described. The distribution device according to claim 1 or 2, wherein the opening area of the hole formed at both ends in the longitudinal direction of the third plate is smaller than the opening area of the hole formed near the collision region. .. A multi-stage distribution device provided with the distribution device according to any one of claims 1 to 3 in multiple stages. A heat exchanger comprising the distributor according to any one of claims 1 to 3 or the multi-stage distributor according to claim 4. An air conditioner comprising the heat exchanger according to claim 5.

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