JP2002130987A - Laminated heat-exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminated heat-exchanger, in which a refrigerant can be uniformly distributed in each tube element. SOLUTION: An inlet-side refrigerant flow-path 21a communicating with refrigerant flow-paths in respective tube elements 2, an outlet-side refrigerant flow-path 21b, and an intermediate refrigerant flow-path 60a are provided in the lamination direction of a tube element 2. A refrigerant inlet for supplying the refrigerant to the flow-path 60a and an outlet for letting out the refrigerant from the flow-path 21b are provided on one side, and U-turn tank 71 is provided on the other side for supplying the refrigerant from the flow-path 60a to the flow-path 21a. At least one porous plate 110 is provided in the upstream end part in the flow path 21a for restriction of refrigerant passage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated heat exchanger used for a vehicle air conditioner or the like.

[0002]

2. Description of the Related Art FIG. 4 is a side view of a laminated heat exchanger used in an evaporator of a conventional vehicle air conditioner, FIG. 5 is a front view thereof, FIG. 6 is a plan view thereof, and FIG. It is a cross-sectional view which follows the AA line. 4, 5, 6, and 7, the stacked heat exchanger 1 includes a large number of tube elements 2.
Are arranged in parallel at an interval, and the air-side corrugated fins 3 are interposed between the tube elements 2 adjacent to each other. In this way, the tube elements 2 and the corrugated fins 3 are alternately stacked, It is formed by brazing below.

Each tube element 2 comprises a pair of forming plates 2a and 2b. Full molding plate 2a
And 2b have a shallow dish shape, and at the upper end of the dish shape,
As shown in FIG. 7, a refrigerant inlet tank 20a, a refrigerant outlet tank 20b having an opening deeper than the main dish and having an opening in the plate thickness direction, and an intermediate tank 60 therebetween are formed in parallel. A refrigerant inlet tank 20a is continuously formed by a plurality of tube elements 2 in a refrigerant passage (inlet-side refrigerant passage).
21a, and the refrigerant outlet tank 20
b and the intermediate tank 60 are continuous, and a refrigerant flow path 21b (outlet refrigerant flow path) and 60a (intermediate refrigerant flow path) are respectively formed. The pair of forming plates 2a and 2b
A U-shaped refrigerant flow path (refrigerant flow path in the tube element) in which the refrigerant flowing from the refrigerant inlet tank 20a flows to the refrigerant outlet tank 20b is provided on the inner surface of each of the tube elements 2 formed by opposing each other. Are formed.

[0004] On one side end face of the laminated heat exchanger 1,
The end plate 4 is mounted as shown in FIG.
The end plate 4 is connected and joined to the forming plate 2b to form a tube element 40 at the end.
An end plate 7 is mounted on the other side end surface,
The end plate 7 is connected and joined to the forming plate 2a to form a tube element 70 at the end.
The end plate 7 is provided with a U-turn tank 71 that sends the refrigerant flowing out of the refrigerant channel 60a to the refrigerant channel 21a by making a U-turn. The refrigerant port 5 is brazed to the tube element 40 side. The refrigerant port 5 includes a front plate 50 having a refrigerant inlet flange 51 a and a refrigerant outlet flange 51 b, and an intermediate plate 6 provided between the front plate 50 and the end plate 4. Intermediate plate 6
The passage 6 for introducing the refrigerant flowing from the refrigerant inlet flange 51a into the intermediate tank 60 of the tube element 40
1a, the flow path 62a, and the refrigerant flowing out of the outlet tank 20b of the tube element 40 through the refrigerant outlet flange 51b.
62b and a passage 61b are formed to guide the flow path.

The laminated heat exchanger 1 configured as described above
Then, the refrigerant flowing from the refrigerant inlet flange 51a flows into the refrigerant flow path 60a of the tube element 40 from the path 61a of the intermediate plate 6 via the flow path 62a, and reaches the U-turn tank 71 formed by the end plate 7 on the opposite side. Flows. The refrigerant changes its direction in the U-turn tank 71,
In the process of flowing through the refrigerant passage 21a connected to the U-turn tank 71, the U
The refrigerant is distributed in a U-shaped refrigerant flow path and flows toward each refrigerant outlet tank 20b. Then, the refrigerant flows from the refrigerant passage 21b formed by the refrigerant outlet tank 20b, through the passage 62b of the intermediate plate 6, through the passage 61b, and out of the refrigerant outlet flange 51b.

[0006]

In the laminated heat exchanger 1 having the above-described structure, the refrigerant passing through the refrigerant passage 60a is subjected to a dynamic pressure when the direction is changed by the U-turn tank 71 of the end plate 7. Occurs. For this reason, the refrigerant inlet tank 2
The refrigerant that has entered the refrigerant flow path 21a of Oa is concentrated and distributed to the tube element 2 on the side close to the U-turn tank 71, and reaches the downstream side of the refrigerant flow path 21a (the refrigerant inlet / outlet part 5 side). Therefore, there is a problem that the refrigerant is not uniformly distributed.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a laminated heat exchanger capable of uniformly distributing a refrigerant to each tube element.

[0008]

According to a first aspect of the present invention, a pair of molding plates are joined together in a state where a refrigerant flow passage in a tube element is formed therebetween to form a tube element. An air-side fin and an air-side fin are alternately stacked, and along the stacking direction of the tube elements, an inlet-side refrigerant flow path and an outlet-side refrigerant flow path that respectively communicate with the refrigerant flow paths in each of the tube elements. , An intermediate refrigerant flow path is provided, and on one side, a refrigerant inlet / outlet section for supplying refrigerant to the intermediate refrigerant flow path and discharging the refrigerant from the outlet side refrigerant flow path is formed, and on the other side, the intermediate In the laminated heat exchanger in which a U-turn tank that sends a refrigerant from a refrigerant flow path to the inlet-side refrigerant flow path is formed, a throttle that restricts the passing refrigerant is provided in the inlet-side refrigerant flow path. Means, characterized in that it is provided at least one.

In this laminated heat exchanger, the refrigerant entering the U-turn tank changes its direction in the U-turn tank to generate a dynamic pressure, and then is throttled by the throttle means in the inlet-side refrigerant flow path. Therefore, the dynamic pressure of the refrigerant is attenuated. The number of aperture means is not limited, and may be one or more.

According to a second aspect of the present invention, in the laminated heat exchanger according to the first aspect, the throttling means is a perforated plate having a plurality of small holes.

In this laminated heat exchanger, the refrigerant is throttled by passing through small holes in the perforated plate.

According to a third aspect of the present invention, in the laminated heat exchanger according to the first aspect, the throttling means is a throttling plate formed with a nozzle concentric with the inlet-side refrigerant flow path. Features.

In this laminated heat exchanger, the refrigerant is throttled by passing through the nozzle of the throttle plate.

[0014]

Next, embodiments of the present invention will be described with reference to the drawings. Note that the same components as those in the related art are denoted by the same reference numerals, and description thereof is omitted. In the stacked heat exchanger 100 shown in FIGS. 1 and 2,
At the side end, a tube element 170 to which the end plate 7 and the molding plate 2a are joined is formed.
At the upstream end of the refrigerant flow path 21a, in the refrigerant inlet tank 20a of the tube element 170, at the connection with the U-turn tank 71, a plurality of small holes 110a are drilled as refrigerant throttle means. A plate 110 is provided.

In the laminated heat exchanger 100, the refrigerant flowing from the refrigerant inlet flange 51a flows from the passage 61a of the intermediate plate 6 through the flow passage 62a to the refrigerant flow passage 60a of the tube element 40, and is connected to the opposite side. It flows to the U-turn tank 71 formed by the end plate 7 (see FIG. 7). The refrigerant that has entered the U-turn tank 71 changes its direction in the U-turn tank 71 to generate dynamic pressure. However, immediately after the change, the plurality of small holes 110a installed in the refrigerant inlet tank 20a of the tube element 170.
, The dynamic pressure of the refrigerant is attenuated. The refrigerant having no influence of the dynamic pressure flows uniformly in the refrigerant flow path 21a, and is uniformly distributed to the U-shaped refrigerant flow paths of the tube elements 2, 170 and 40, and then the refrigerant outlet. It flows to the tank 20b side. The refrigerant entering each of the refrigerant outlet tanks 20b passes from the refrigerant flow path 21b through the flow path 62b of the intermediate plate 6 shown in FIG.
b and flows out from the refrigerant outlet flange 51b. As described above, the perforated plate 1 immediately after the U-turn tank 71
The installation of 10 eliminates the influence of the dynamic pressure of the refrigerant, so that the refrigerant can be uniformly distributed to the refrigerant flow paths of the tube elements 2, 170, 40.

In this embodiment, the tube element 170
Although the example in which one perforated plate 110 is installed is shown in FIG. 1, the same effect can be obtained when a plurality of perforated plates 110 are installed in series as needed. In this case, in order to adjust the restriction of the refrigerant flow, the number or the diameter of the small holes 110a of each perforated plate 110 may be changed. Furthermore, in this example, the case where the refrigerant inlet tank 20a, the refrigerant outlet tank 20b, and the intermediate tank 60 are installed at the upper part of the stacked heat exchanger 100 is shown, but the same applies to the case where it is installed at the lower part. A structure can be adopted, and in this case, the same effect can be obtained.

Next, a second embodiment of the present invention will be described. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. In the laminated heat exchanger 101 shown in FIG. 3, a tube element 171 in which the end plate 7 and the molding plate 2a are joined is formed at a side end. At the upstream end of the refrigerant flow path 21a, in the refrigerant inlet tank 20a of the tube element 171, a nozzle 120a concentric with the refrigerant inlet tank 20a as a refrigerant throttle means is provided at a connection portion with the U-turn tank 71. The formed aperture plate 120 is provided.

In the laminated heat exchanger 101, the refrigerant flowing from the refrigerant inlet flange 51a flows from the passage 61a of the intermediate plate 6 to the refrigerant flow passage 60a of the tube element 40 via the flow passage 62a, and to the opposite side. It flows to the U-turn tank 71 formed by the end plate 7. U
The refrigerant that has entered the turn tank 71 is the U-turn tank 7.
1, the dynamic pressure is generated by the change in direction. Immediately after the change in direction, the refrigerant passes through the throttle plate 120 in which the concentric nozzle 120a provided in the refrigerant inlet tank 20a of the tube element 170 is formed. Dynamic pressure attenuates. The refrigerant having no influence of the dynamic pressure flows uniformly through the refrigerant flow path 21a formed by each of the refrigerant inlet tanks 20a, and the respective tube elements 2, 171, 4
The refrigerant is uniformly distributed in the zero U-shaped refrigerant flow path. Then, it flows to the refrigerant outlet tank 20b side, and each refrigerant outlet tank 20b
The entered refrigerant flows from the refrigerant flow path 21b through the flow path 62b of the intermediate plate 6 shown in FIG. 7, passes through the path 61b, and flows out of the refrigerant outlet flange 51b. As described above, the installation of the throttle plate 120 immediately after the U-turn tank 71 eliminates the influence of the dynamic pressure of the refrigerant, so that each tube element 2,
The refrigerant can be uniformly distributed to the refrigerant passages 171 and 40.

In this embodiment, the tube element 171 is used.
Although the example in which one aperture plate 120 is installed is shown in FIG. 1, a plurality of aperture plates 120 may be installed as needed. In this case, the same effect can be obtained. In this case, the diameter of the nozzle 120a of each throttle plate 120 may be changed in order to adjust the refrigerant flow. Further, in this example, the case where the refrigerant inlet tank 20a, the refrigerant outlet tank 20b, and the intermediate tank 60 are installed at the upper part of the stacked heat exchanger 101 is shown, but the same applies to the case where they are provided at the lower part. A structure is also possible.

[0020]

As described above, in the laminated heat exchanger according to the present invention, the refrigerant entering the U-turn tank generates a dynamic pressure by changing its direction in the U-turn tank. The dynamic pressure of the refrigerant is attenuated because it is throttled by the throttle means in the side refrigerant flow path. Therefore, since the refrigerant flows uniformly in the inlet-side refrigerant flow path, the refrigerant can be uniformly distributed to each tube element.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a refrigerant tank portion of a laminated heat exchanger shown as a first embodiment of the present invention.

FIG. 2 is a P view of FIG. 1 of the laminated heat exchanger.

FIG. 3 is a partial cross-sectional view of a refrigerant tank portion of a stacked heat exchanger shown as a second embodiment of the present invention.

FIG. 4 is a side view of a conventional laminated heat exchanger.

FIG. 5 is a front view of the laminated heat exchanger.

FIG. 6 is a plan view of the laminated heat exchanger.

FIG. 7 is a cross-sectional view taken along line AA of FIG.

[Explanation of symbols]

 2 Tube element 2a, 2b Mold plate 5 Refrigerant inlet / outlet 21a Refrigerant flow path (inlet-side refrigerant flow path) 21b Refrigerant flow path (outlet-side refrigerant flow path) 60a Refrigerant flow path (intermediate refrigerant flow path) 71 U-turn tank 110 perforated Plate (aperture means) 120 Aperture plate (aperture means)

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshinori Watanabe 1 Nagoya Laboratory, Iwazuka-cho, Nakamura-ku, Nagoya City, Aichi Prefecture Inside Nagoya Research Laboratory, Mitsubishi Heavy Industries, Ltd. (72) Inventor Akira Yoshikoshi F-term (reference) 3L065 FA17 in Nagoya Laboratory, Mitsubishi Heavy Industries, Ltd.

Claims (3)

[Claims] 1. A pair of molded plates are joined in a state in which a refrigerant passage in a tube element is formed therebetween to form a tube element, and the tube element and the air-side fin are alternately laminated. An inlet-side refrigerant flow path and an outlet-side refrigerant flow path that are respectively connected to the refrigerant flow paths in each of the tube elements, and an intermediate refrigerant flow path. On the side surface, a refrigerant inlet / outlet portion for supplying the refrigerant to the intermediate refrigerant flow path and discharging the refrigerant from the outlet side refrigerant flow path is provided, and on the other side, the refrigerant from the intermediate refrigerant flow path is supplied to the inlet side refrigerant. In the laminated heat exchanger provided with a U-turn tank to be sent to the flow path, at the upstream end in the inlet-side refrigerant flow path, at least one throttle means for restricting the passing refrigerant is provided. Laminated heat exchanger, characterized by being kicked. 2. The stacked heat exchanger according to claim 1, wherein the throttle means is a perforated plate having a plurality of small holes. 3. The stacked heat exchanger according to claim 1, wherein the throttle means is a throttle plate formed with a nozzle concentric with the inlet-side refrigerant flow path. vessel.