JPH06331283A - Multilayer type heat exchanger - Google Patents

Abstract

PURPOSE:To obtain multilayer type heat exchanger making it easy to stretch pipings around and requires the area for installation small in the case of a specification wherein the piping are laid out in the same direction. CONSTITUTION:Front and rear header parts 7 and 6 are divided respectively into two header division chambers 7A and 7B, and 6A and 6B, by partition walls 16 and 15 and thereby a zigzag fluid passage is formed from the header division chamber 7A in the left end of the front-side header part 7 to the header division chamber 6B in the right end of the rear-side header part 6.A right end part plate 2 is provided with a fluid discharge port 17 communicating with the header division chamber 6B in the right end of the rear-side header part 6, and with a pipe insertion hole 19 communicating with the header division chamber 7B in the right end of the front-side header part 7. The partition wall 16 of the header division chamber 7A in the left end of the front-side header part 7 is provided with a fluid introduction port 22, and a fluid introduction pipe 23 inserted through the pipe insertion hole 19 pierces through the header division chamber 7B of the front-side header part 7, in a state of a fluid passing space left between this pipe and the peripheral edges of fluid passing holes 14 and 13, and is connected to the peripheral edge part of the fluid introduction port 22.

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 an evaporator for a car / air conditioner.

[0002]

2. Description of the Related Art Conventionally, a laminated heat exchanger used for an evaporator for a car / air conditioner has a substantially U-shaped fluid passage forming recess and front and rear header forming recesses connected to both ends thereof. Further, plates having fluid passage holes formed in the bottom walls of the front and rear header forming recesses are stacked in layers with the recesses facing each other adjacent to each other on the left and right, and parallel flat tubes are formed. And front and rear header portions are formed, partition walls for closing the fluid passage holes are provided at required positions between the left and right ends of the front and rear header portions, and each of the front and rear header portions is divided into two or more parts. It is known that a flow path is formed.

In this laminated heat exchanger, the plate at the left end is provided with a fluid introduction port, the fluid introduction port is connected to this fluid introduction port, and the plate at the right end is provided with a fluid discharge port, and this fluid discharge port is provided. A fluid discharge pipe is connected to the outlet.

[0004]

In the above-mentioned conventional laminated heat exchanger, the fluid discharge pipe and the fluid introduction pipe are provided separately on both sides of the heat exchanger, so that the pipes are designed to be drawn out in the same direction. In this case, the arrangement of the piping was troublesome and the installation area increased by the amount of the arrangement of the piping.

An object of the present invention is to provide a laminated heat exchanger in which the pipes can be easily routed and the installation area can be reduced in the case where the pipes are designed to extend in the same direction.

[0006]

SUMMARY OF THE INVENTION A laminated heat exchanger according to the present invention has a substantially U-shaped fluid passage forming recess and front and rear header forming recesses connected to both ends of the fluid passage forming recess. Plates with fluid passage holes in the bottom wall of the recess for use are stacked in layers with the recesses facing each other on the left and right, and the parallel flat tubes and front and rear header parts are formed. A front header partition wall and a rear header partition wall that close the fluid passage holes are formed at required locations between the left and right ends of the front and rear header parts to form a meandering fluid flow path, and the plate at the right end is formed. In the laminated heat exchanger in which a fluid discharge port that communicates with the rear header section is provided, and a fluid discharge pipe is connected to the fluid discharge port, a pipe insertion hole that communicates with the front header section is provided in the right end plate, Front head The partition wall at the left end of the section is provided with a fluid introduction port, and the fluid introduction pipe inserted through the pipe insertion hole is connected to the fluid introduction port with a fluid passage gap left between the fluid passage hole and the periphery thereof. It is characterized by that.

[0007]

According to the laminated heat exchanger of the present invention, the fluid introduction pipe and the fluid discharge pipe both come out from the same side of the heat exchanger, and the fluid introduced through the fluid introduction pipe has the left end. Makes a U-turn in the section, and flows in a meandering shape through the fluid passage gap between the inner portion of the header of the fluid introduction pipe and the periphery of the fluid passage hole, reaches the right end of the rear header section, and discharges through the fluid discharge pipe. To be done.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

In this specification, front and rear and left and right are based on FIG. 4, the upper part of the figure is referred to as rear and the lower part is referred to as front, and the left and right of FIG. 4 are referred to as left and right.

1 to 4 showing an embodiment of the present invention, a laminated evaporator (1) for a car air conditioner is shown.
Is a pair of flat plate-shaped end plates made of aluminum (including aluminum alloy) and arranged on both the left and right outer sides.
(2) (2) and a large number of intermediate plates (4) (4A) (4B) arranged in parallel between the left and right end plates (2) (2).

The intermediate plates (4), (4A), and (4B) are two sheets for dividing the front header section (7), which is arranged at a position closer to the right about 1/3 between the left and right ends from the left end. Intermediate plate (4A)
And two intermediate plates (4B) for dividing the rear header section (6), which are located at a position about 2/3 to the right between the left and right ends from the left end, and the remaining standard intermediate plates ( 4) and.

FIG. 3 shows a pair of standard intermediate plates (4). As shown in the figure, the intermediate plate (4) has a front vertical part (8a), a rear vertical part (8b) and a horizontal part (8c) connecting these parts.
A substantially U-shaped recess for forming a fluid flow path (8) and a recess for forming both front and rear headers (11) deeper than the recess for fluid flow path formation (8) and connected to the upper ends of the front and rear vertical portions of the recess (11). (9) and have. In the bottom wall (11a) (9a) of the recesses (11) (9) for forming the front and rear headers of the standard intermediate plate (4), there are two substantially oval fluid passage holes (14) (13) that are long in the front and rear. ) Is opened. At the center of the fluid passage forming recess (8) of each intermediate plate (4), there is a vertically extending partitioning protrusion (20) for making the fluid passage U-shaped. ) Is provided from the upper end to the lower end. A large number of slanted ribs (12) are formed on the bottom wall of the fluid channel forming recess (8) to disturb the flow of the refrigerant in the fluid channel to improve heat transfer efficiency.

Front header section (7) Intermediate plate for dividing (4
In A), a long oblong fluid passage hole (13) is formed in the bottom wall (9a) of the rear header forming recess (9), but the bottom of the front header forming recess (11) is formed. No fluid passage hole is formed in the wall (11a), and the bottom wall (11a) without this fluid passage hole serves as the front header partition wall (16). The front header partition wall (16) is provided with a fluid introduction port (22).

Rear header part (6) Intermediate plate for dividing (4
In B), a long elliptical fluid passage hole (13) is formed in the bottom wall (11a) of the front header forming recess (11) in the front-rear direction.
The bottom wall (9a) of the rear header forming recess (9) has no fluid passage hole, and the bottom wall (9a) without this fluid passage hole is called the rear header partition wall (15). Has been done.

The above intermediate plates (4) (4A) (4B) are arranged side by side by stacking them in layers with the recesses (8) (11) (9) facing each other adjacent to each other on the left and right. A flat tube portion (5) and front and rear header portions (7) and (6) are formed.
In addition, two intermediate plates (4
A) and rear header part (6) 2 intermediate plates for division
(4B) is the bottom wall (11a) of the front and rear header forming recesses (11) and (9).
(9a) They are arranged so that they are in contact with each other. Also, at both left and right ends, the standard intermediate plate (4) and end plate (2) allow the flat tube section (5) and the front and rear header sections (7).
(6) is formed.

The front and rear header parts (7) and (6) are closed at their left and right ends by the end plates (2) and (2), and the space between the left and right ends is partitioned by the front and rear header part partition walls (16) and (15). 2 each
It is divided into one or more header compartments (7A) (7B) (6A) (6B). Then, these flat tubes (5) and each header compartment
(7A) (7B) (6A) (6B), as shown by the arrow in FIG. 2, the front header part (7) from the first header compartment (7A) on the left side to the parallel flat pipe part (5A) on the left side , Rear header section (6) Left middle header compartment (6A), Central parallel flat tube section (5B), Front header section
(7) Middle header compartment (7B) on the right side, parallel flat pipe section on the right side
(5A), the rear header section (6)
A meandering fluid flow path leading to B) is formed.

The right end plate (2) has a final header compartment.
A fluid discharge port (17) communicating with (6B) is provided, and a fluid discharge pipe (18) is connected to the fluid discharge port (17).

The right end plate (2) is further provided with a pipe insertion hole (19) communicating with the intermediate header compartment (7B) on the right side of the front header section (7). The fluid introduction pipe (23) is inserted into this pipe insertion hole (19), and the tip of the fluid introduction pipe (23) is the partition wall (16) of the first header compartment (7A) on the left side of the front row.
Is connected to the fluid inlet (22). Thus, the refrigerant introduced from the fluid introduction pipe (23) first flows into the first header compartment (7A) on the left side of the front row. The diameter of the fluid introduction pipe (23) is slightly smaller than the diameter of the fluid discharge pipe (18), and the inside of the header (23a) of the fluid introduction pipe (23)
Penetrates the middle header compartment (7B) of the front header part (7) with a fluid passage gap left between the fluid passage holes (14) and (13). Inside the header of the fluid introduction pipe (23) (2
3a) and the outer part (23b) of the header are formed as separate members, and both parts (23a) (23b) are welded near the pipe insertion hole (19). The header inner part (23a) and the header outer part (23b) of the fluid introduction pipe (23) may be a single pipe.
The left end of the header part (23a) of the fluid introduction pipe (23) is
It is fixed to the periphery of the fluid introduction port (22) of the partition wall (16) by brazing.

A louver is provided between the flat tubes (5) adjacent to each other.
(21) Corrugated fin (3) is interposed. The side plates (10) and (10) are superposed on both outer sides of the end plates (2) and (2), respectively, and the louver (21) is also provided between each side plate (10) and the flat pipe section (5). ) Corrugated fins (3)
Is intervening.

The above heat exchanger can be obtained by placing it in a furnace with fluid discharge and introduction pipes (18) and (23) and brazing it all together. In addition, the fluid discharge pipe (1
8) and fluid outlet (17) peripheral edge and the introduction pipe (2
The connection portion between 3) and the periphery of the fluid insertion hole (19) is arc-welded from the outside to secure airtightness and fix it.

The inside of the header of the fluid introducing pipe (23)
(20a) and the left end of the fluid introduction port (22) peripheral edge of the partition wall (16) are brazed by applying brazing material to the fluid introduction port (22) peripheral edge of the partition wall (16), In order to increase the reliability of brazing, as shown in FIG. 5, the fluid introducing pipe (31) may be subjected to beading processing so as to be provided with an outward annular protrusion (32). If necessary, a brazing material may be sandwiched between the left end face of the annular protrusion (32) and the right end face of the partition wall (16). As a result, even if the outer diameter of the fluid introduction pipe (31) and the diameter of the fluid introduction port (22) vary to some extent, brazing can be performed reliably and the reliability of brazing can be improved. It is also possible to form the partition wall by using the standard intermediate plate (4) by bringing the annular protrusion (32) into close contact with the bottom wall (11a) of the front header portion forming recess (11). it can.

Further, the inner portion (31a) of the header of the fluid introducing pipe (31) provided with the beading process and provided with the outwardly projecting annular protrusion (32) and the periphery of the fluid introducing port (22) of the partition wall (16). Fixing with the left end of the is not done by brazing, but after collectively brazing without the introduction pipe (31), as shown in FIG. 6, an adhesive (33) such as a metal bond is applied to the annular protrusion. It may be applied between the left end face of (32) and the right end face of the partition wall (16). In this case, since the introduction pipe (23) does not get in the way, it is easy to set before putting in the furnace, and a jig similar to the conventional heat exchanger jig can be used as the jig for setting. Moreover, compared with brazing, there is an advantage that it is easy to repair when there is a defect inside the heat exchanger.

By the way, the oil flows into the fluid introduction pipes (23) and (31) together with the refrigerant. However, when the refrigerant and the oil are compared, the heavier oil is the heavier oil and the fluid introduction port (22). A large amount of the refrigerant flows in the vicinity of the flow path, and conversely, the lighter refrigerant flows in the flow path near the left end plate (2).
For this reason, there is a problem in that oil easily collects in the flow passage near the fluid introduction port (22), and the oil in the flow passage near the fluid introduction port (22) becomes full and the performance deteriorates.

FIG. 7 shows a modification of the header structure for eliminating the performance deterioration due to this oil.

As shown in FIG. 7, in the header portion (41a) of the fluid introducing pipe (41), only the lower end of the fluid introducing pipe (41) is extended to the left end plate (2), so that an oil feed having an arcuate section is formed. The rail (42) is integrally formed.

As a result, a large amount of the refrigerant flows in the flow path near the left end plate (2), while the oil is also sent to the oil feed rail (42) and flows near the left end plate (2). Because it flows a lot on the road, it improves the balance,
The flow of the refrigerant can be averaged. Therefore, the heat exchange efficiency is improved. In addition, since the oil easily flows into the next flow path, the oil can be discharged smoothly.

The oil feed rail may be fixed to the bottom wall (11a) of the header forming recess (11) as a separate member instead of being integrally provided with the fluid introduction pipe (41).

Further, the intermediate plate used in the evaporator (1) is not limited to the one shown in FIG. 3, and various plates can be used. Specific examples thereof are shown in FIGS. 9 and 10.

In the intermediate plate (51) shown in FIG. 9, the slanted rib (1) shown in FIG. 3 is provided on the bottom wall of the fluid channel forming recess (8).
Instead of 2), a plurality of horizontal ribs (52) are formed. The horizontal ribs (52) extend from the front end to the rear end part of the front and rear vertical parts (8a) and (8b) of the fluid flow path forming recess (8) and to the front end part from the rear end. And are alternately provided in sequence, and are symmetrical. As a result, when the refrigerant flows in the vertical portions before and after the U-shaped fluid flow path of the flat tube portion (5), it flows meandering in the front-rear direction, and the refrigerant is mixed in the flow path. Therefore, the refrigerant temperature is averaged and the heat exchange efficiency is improved.

In the intermediate plate (61) shown in FIG. 10, the pattern of the ribs is asymmetrical in the front-rear direction, and the recess for forming the fluid flow path is formed.
In the bottom wall of the front vertical part (8a) of (8), a number of diagonal ribs (62) are provided in zigzag, and in the rear vertical part (8b), two vertical ribs parallel to the partition convex part (20) are provided. Only ribs (63) are provided. Then, the intermediate plate (61) shown in FIG. 10 and another plate formed in a shape opposite to the front and back of the intermediate plate (61) are superposed as a pair, and, for example, all the intermediate plates (4) (4A) (4B) Approximately one-third of these, which are near the right end, are replaced with this intermediate plate (61).

As a result, at a position near the right end of the flow path, the refrigerant flowing in the liquid phase into the front vertical part of the U-shaped fluid flow path of the flat tube portion (5) moves downward in the front vertical part. As it flows, it takes heat, turns, and then climbs up the vertical part on the rear side in the vapor phase. Therefore, U of the flat pipe section (5)
Within the vertical part on the front side of the letter-shaped fluid flow path, diagonal ribs (6
The stirring is promoted by 2) and the heat transfer efficiency is improved. In the vertical part on the rear side of the U-shaped fluid flow path, the flow is not rectified by the vertical ribs (63) but the flow path resistance does not increase. As a result, the performance of the heat exchanger can be improved.

In each of the above-mentioned embodiments, the present invention is applied to a so-called vertical type heat exchanger in which the flat tube portions are arranged in parallel in the vertical direction. It is similarly applied to a so-called horizontal type heat exchanger in which are arranged in parallel in the horizontal direction. Further, the front and rear and the left and right in the above embodiment are determined for convenience, and it is of course possible to reverse the front and rear or reverse the left and right.

[0033]

According to the laminated heat exchanger of the present invention, since the fluid introduction pipe and the fluid discharge pipe both come out from the same side of the heat exchanger, when the pipes are installed in the same direction, the piping It is easy to handle and requires a small installation area.

[Brief description of drawings]

FIG. 1 is a perspective view schematically showing an embodiment of a laminated heat exchanger according to the present invention.

FIG. 2 is a perspective view showing a fluid flow path of the heat exchanger.

FIG. 3 is a perspective view showing an embodiment of an intermediate plate that constitutes the heat exchanger.

FIG. 4 is a horizontal cross-sectional view of the inside of the header showing the main part of the heat exchanger.

FIG. 5 is a vertical cross-sectional view showing a joint portion between a fluid introduction pipe and a partition wall of the heat exchanger.

FIG. 6 is a vertical sectional view showing a modified example of a joint portion between a fluid introduction pipe and a partition wall.

FIG. 7 is a vertical sectional view showing a modification of the structure of the header portion.

FIG. 8 is a perspective view of a fluid introduction pipe used in the modified example.

FIG. 9 is a vertical sectional view showing a modified example of the intermediate plate.

FIG. 10 is a vertical sectional view showing another modification of the intermediate plate.

[Explanation of symbols]

 (2) End plate (4) Plate (6) Rear header section (6A) First header branch (6B) Intermediate header branch (7) Front header section (7A) Intermediate header branch (7B) Final header branch (8) ) Fluid channel forming recess (9) Rear header forming recess (9a) Bottom wall (11) Front header forming recess (11a) Bottom wall (13) Fluid passage hole (14) Fluid passage hole (15) Partition Wall (16) Partition wall (17) Fluid outlet (18) Fluid outlet pipe (19) Pipe insertion hole (22) Fluid inlet (23) Fluid inlet pipe

Front page continuation (72) Junpei Nakamura, 6-224, Kaiyama-cho, Sakai City, Showa Aluminum Co., Ltd. (72) Nobuaki Go, 6-224, Kaiyama-cho, Sakai City, Showa Aluminum Co., Ltd.

Claims (1)

[Claims] 1. A substantially U-shaped fluid passage forming recess (8) and front and rear header forming recesses (11) (9) connected to both ends of the recess.
And the bottom walls (11a) of the front and rear header forming recesses (11) (9)
Plate with fluid passage holes (14) and (13) in (9a)
(2) (4) are adjacent to each other on the left and right Recesses (8) (11)
The flat tubes (5) and the front and rear header parts (7) and (6) are formed in parallel by stacking them in layers with the (9) facing each other, and the left and right front and rear header parts (7) and (6) are formed. A front header partition wall (16) and a rear header partition wall (15) that close the fluid passage holes (14) and (13) are provided at required locations between both ends to form a meandering fluid flow path. , The rear header on the rightmost plate (2)
A fluid outlet (17) leading to (6) is provided.
In the laminated heat exchanger in which the fluid discharge pipe (18) is connected to (7), the plate (2) on the right end is provided with a pipe insertion hole (19) communicating with the front header part (7), and the front header part ( 7)
The partition wall (16) at the left end of the is provided with a fluid introduction port (22), and the fluid introduction pipe (23) inserted through the pipe insertion hole (19) is located between the fluid passage holes (14) and (13) peripheral edges. A laminated heat exchanger characterized in that it is connected to a fluid inlet (22) with a fluid passage gap left inside.