JPH0674601A - Laminated type heat exchanger - Google Patents

Abstract

PURPOSE:To increase anti-pressure strength without making any substantial reduction in a refrigerant flow passage by a method wherein only the upper half part of an inlet tank or an outlet tank is made in ellipse shape. CONSTITUTION:A flat tube 1 is formed by abutting two press formed plates 2 to each other. One end of the flat tube 1 is formed with an outlet or inlet tank 3. The flat tubes 1 and the corrugated fins 4 are alternatively piled up, the outlet or inlet tanks 3 are connected to form an evaporator 5. The inlet or outlet tank 3 is partitioned into an inlet part 6 and an outlet part 7 in a plate width direction of the flat tube 1. In the case that the evaporator 5 is constructed, the adjoining inlet or outlet tanks 3 are communicated to each other at their inlets 6 and outlets 7. The inlets 6 and the outlets 7 of the inlet or outlet tank 3 is elongated in a plate width direction and flat in its shape, their lower halves are elongated circle and only the upper halves are ellipse. With such an arrangement as above, it is possible to increase the anti-pressure strength without making any substantial reduction in a refrigerant flow 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 for an air conditioner, and more particularly to a heat exchanger having improved pressure resistance.

[0002]

2. Description of the Related Art An example of a laminated heat exchanger used in an air conditioner is shown in FIGS. FIG. 8 shows the side surface of the entire heat exchanger, and FIG. 9 shows an enlarged cross section of a part thereof. In FIG. 8, reference numeral 51 denotes a flat tube, which is formed by abutting two press-molded plates 52.
An inlet / outlet tank portion 53 is formed at one end portion (upper end portion in the figure) of the flat tube 51.

A large number of flat tubes 51 and corrugated fins 54 are alternately laminated, and the inlet / outlet tank portion 53 is connected to form a laminated heat exchanger (evaporator) 55. The outer sides of the flat tubes 51a located at both ends serve as end plates 56, and the end plates 56 in the inlet / outlet tank section 53 are provided with flow holes 57. One of the circulation holes 57 is connected to a refrigerant introduction pipe 58 as a fluid, and the other circulation hole is connected to a refrigerant discharge pipe 59. The introduction pipe 58 and the discharge pipe 59 are the side plate 6
Fixed at 0, side plate 60 and end plate 5
Corrugated fins 54 are provided between the six. The inlet / outlet tank portion 53 is partitioned into an inlet portion 61 and an outlet portion 62 in the plate width direction of the flat tube 51, and an evaporator 55 is provided.
In the case of configuring the
The communication holes 63 communicate with each other and the outlet portions 62.

The evaporator 55 as described above is also planned to be miniaturized, and as a means thereof, the entrance / exit tank section 5 is used.
It has been made to flatten 3. That is, the communication hole 63 of the inlet / outlet tank portion 53 is formed in an elongated ellipse in the width direction.

[0005]

By the way, such an evaporator 55 is integrated by brazing in a laminated state. That is, the flat tube 51, the corrugated fins 54, and the inlet / outlet tank portion 53 are brazed to each other. The flat tube 51 and the corrugated fins 54 are brazed at each contact point,
The plates 52 constituting the above are brazed together at their joints such as the edge portions and the contact portions between the ribs 64 protruding inside.

Due to this brazing, the inlet / outlet tank portion 53
Flat tube 51 and corrugated fin 54 compared to each other
The core portion, which is a joint portion with, has higher brazing points and thus has higher strength. Therefore, when pressure is applied by passing the refrigerant, since the strength of the inlet / outlet tank portion 53 is low, this portion is greatly expanded, and the evaporator 55 is expanded.
There was a risk that the whole would be transformed into a fan shape.

[0007]

In order to solve the above problems, according to the present invention, two press forming plates each having a fluid inlet / outlet tank portion formed at one end and a fluid passage formed between the copper inlet / outlet tank portions are formed. Butt to form a flat tube,
In the laminated heat exchanger configured by laminating a large number of the tubes, the upper half of the inlet / outlet tank portion has an elliptical shape.

[0008]

In the laminated heat exchanger having the above structure, the upper half of the inlet / outlet tank portion has an elliptical shape, so that the strength can be improved. In addition, downsizing can be maintained.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the laminated heat exchanger according to the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of a flat tube in an evaporator according to an embodiment, and FIG. 2 is a front view of a plate forming the flat tube,
FIG. 3 shows details of the upper portion of the flat tube, and FIG. 4 shows a cross section of the flat tube.

The flat tube 1 is formed by abutting two press-formed plates 2. Flat tube 1
An inlet / outlet tank portion 3 is formed at one end portion (upper end portion in the drawing) of the. As shown in FIGS. 5 and 6, the flat tube 1
And corrugated fins 4 are alternately stacked, and the inlet / outlet tank portion 3 is connected to form an evaporator 5.

The inlet / outlet tank portion 3 is partitioned into an inlet portion 6 and an outlet portion 7 in the plate width direction of the flat tube 1, and when the evaporator 5 is constructed, the adjacent inlet / outlet tank portion 3 is connected to the inlet portion 6 and the outlet portion 7. The communication holes 8 communicate with each other. The inlet portion 6 and the outlet portion 7 of the inlet / outlet tank portion 3 have an elongated flat shape in the plate width direction as shown in detail in FIG. 3, and the lower half portions 6a and 7a have an oval shape. None, only the upper half 6b, 7b has an elliptical shape. In addition, in the plate 2, one communication hole 8 is a through hole in order to form the inlet portion 6 or the outlet portion 7, and a flange portion 8a is formed at the edge of the other communication hole 8.
The flange portion 8a is adapted to be inserted into the communication hole 8 of the plate 2 of another flat tube 1 adjacent to each other.

The inner space of the plate 2 is divided into two chambers 10 and 11 by a partition wall 9 extending vertically in the central portion. The partition wall 9 lacks a lower end portion, and the lower end of the plate 2 has a U-turn portion 12 for making a U-turn of a refrigerant as a fluid.
Has become. By abutting the two plates 2, the partition wall 9 partitions the inlet / outlet tank part 3 into the inlet part 6 and the outlet part 7, and the chamber 10 continuous to the inlet part 6 and the chamber continuous to the outlet part 7. It is divided into 11. Further, the chamber 10 and the chamber 11 are communicated with each other by the U-turn portion 12, and the fluid passage 13 is formed by the chambers 10, 11 and the U-turn portion 12.

Corrugated inner fins 14 and 15 are inserted in the portions (straight portions) of the chambers 10 and 11 of the fluid passage 13. As shown in FIG. 4, in the corrugated inner fins 14 and 15, the flow path 1 along the length direction (vertical direction) of the chambers 10 and 11 is formed.
A plurality of corrugations 14a and 15a along the length direction are formed so that a plurality of 6 and 17 are divided and formed.

In the U-turn portion 12 of the fluid passage 13, a plurality of U-shaped flow paths 18 for guiding the U-turn of the refrigerant are divided and formed. The U-shaped channel 18 is formed by a plurality of U-shaped beads 19 press-molded on the abutting surface of the plate 2, and the U-shaped channel 18 is U-shaped along the shape of the plate 2.

When the refrigerant flows between the chambers 10 and 11, the refrigerant flowing through the flow passages 16 and 17 outside the width direction of the flat tube 1 flows through the U-shaped flow passage 18 outside the U-turn portion 12.
Further, the refrigerant flowing through the flow passages 16 and 17 on the inner side in the width direction of the flat tube 1 has a U-shaped flow passage 18 on the inner side of the U-turn portion 12.
Flowing through. That is, the refrigerant in the flat tube 1 flows through the fluid passage 13 from the inside to the inside and from the outside to the outside.

In the flat tube 1 described above, the refrigerant as the fluid flowing in from the inlet portion 6 has the corrugated inner fins 14
Is guided to the U-turn portion 12 through the flow path 16 partitioned by the U-shaped flow path 18 partitioned by the U-shaped beads 19.
Flow channel 1 that is turned and divided by corrugated inner fins 15
It flows through 7 to the outlet 7. Evaporator 5
The header 21 is attached to one end of the
Is provided, a refrigerant introduction pipe 22 is connected to the header 21, and a header 24 is also provided on the other end side through an end plate 23, and a refrigerant discharge pipe 25 is connected thereto.

Since the refrigerant flowing in the flat tube 1 flows through the divided flow paths 16 and 17 and the U-shaped flow path 18,
The refrigerant flows from the inside to the inside of the fluid passage 13 and from the outside to the outside, and the separation of the gas-liquid two-phase refrigerant due to the centrifugal force in the U-turn portion 12 is limited to the inside of the U-shaped flow path 18, and the two-phase flow is generated. The distribution of the distribution amounts of the gas and liquid of the refrigerant becomes small. Moreover, since the U-shaped flow path 18 of the U-turn portion 12 has a U-shape that follows the shape of the plate 2, stagnation does not occur in the flow of the refrigerant. For this reason, the distribution of the gas-liquid distribution amount of the refrigerant becomes small, the thermal efficiency is less likely to decrease due to the deviation, and the heat exchange amount does not become uneven due to the stagnation in the flow of the refrigerant.

In the evaporator 5 having the above structure, since the inlet / outlet tank portion 3 is flat, the dimension in the height direction can be reduced and the upper half is oval.
It also has excellent strength, the desired repeat strength,
Withstand pressure strength can be obtained. Note that only the upper half needs to be elliptical. In terms of strength, the upper half is sufficient, and also to secure an effective area.

In the above embodiment, the target heat exchanger has the inner tubes 14 and 15 inserted in the flat tube 1, but the heat exchanger to which the present invention is applied is not limited to this. As shown in FIG. 9, it can also be applied to those having ribs on the inner surface. Further, the present invention can be applied to a stack type heat exchanger in which the inside of the tube 1 is vertically divided into a plurality of pieces by beads, and other types are used.

[0020]

According to the laminated heat exchanger of the present invention,
Since only the upper half of the inlet / outlet tank part has an elliptical shape, it is possible to increase the strength without significantly reducing the refrigerant flow path.
Repeated pressing strength and pressure resistance are improved. Further, by increasing the strength not only in the stacking direction but also in the circumferential direction, the pressure resistance of the entire heat exchanger is improved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a flat tube in a laminated heat exchanger according to an embodiment of the present invention.

FIG. 2 is a front view of a plate forming a flat tube.

FIG. 3 is an enlarged view of the upper part of the plate.

FIG. 4 is a cross-sectional view of a flat tube.

FIG. 5 is a front view of the heat exchanger according to the embodiment.

FIG. 6 is a plan view of FIG.

FIG. 7 is a cross-sectional view taken along the plane of the inlet / outlet tank portion of the heat exchanger according to the embodiment.

FIG. 8 is a front view of an example of a conventional laminated heat exchanger.

9 is an enlarged cross-sectional view of a part of the heat exchanger shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flat tube 2 Plate 3 Inlet / outlet tank part 4 Corrugated fin 5 Evaporator 6 Inlet part 7 Outlet part 8 Communication hole 6a Elliptical upper half part of the inlet part 7a Elliptical upper half part of the exit part 9 Partition wall 12 U turn part 22 introduction pipe 25 discharge pipe

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Minoru Otsuka No. 1 Takamichi, Iwazuka-cho, Nakamura-ku, Nagoya-shi, Aichi Mitsubishi Heavy Industries, Ltd. Nagoya Research Laboratory

Claims (1)

[Claims] 1. A flat tube is formed by abutting two press-molded plates formed by molding a fluid inlet / outlet tank part at one end and forming a fluid flow path between the inlet / outlet tank parts, and laminating a large number of the tubes. In the laminated heat exchanger configured as described above, the upper half of the inlet / outlet tank portion has an elliptical shape.