JP4124905B2 - Heat exchanger - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heat exchanger used as an evaporator for a car air conditioner, for example. In this specification, “left and right” refers to the left and right of FIG. 3, “front” refers to the bottom of FIG. 3, and “rear” refers to the top of FIG.
[0002]
[Prior art]
As an evaporator for a conventional car air conditioner, the evaporator body has a plurality of vertical flat hollow portions having a substantially U-shaped refrigerant passage as viewed from the side and arranged at predetermined intervals in the left-right direction, A first header portion extending in the left-right direction so that the front ends of the refrigerant passages in the flat hollow portion communicate with each other, having a refrigerant introduction hole at one end and closed at the other end, and after the refrigerant passages in all the flat hollow portions A second header part that extends in the left-right direction so that the ends communicate with each other, has a refrigerant discharge hole at one end and is closed at the other end, and the refrigerant flows in a meandering manner in the evaporator body, Some header sections are provided with at least one vertical partition wall, and the bypass pipe is inserted through the refrigerant introduction hole of the first header section and the coolant passage hole formed in the vertical partition wall. . The bypass pipe was temporarily fastened to the edge of the refrigerant fluid introduction hole of the first header part by caulking one end of the bypass pipe with a pipe expanding punch, and then brazed to the other components of the evaporator in the furnace. .
[0003]
[Problems to be solved by the invention]
However, if the temporarily assembled evaporator has an in-furnace attitude, for example, with the temporarily secured end of the bypass pipe facing upward, the bypass pipe will fall if the bypass pipe is insufficiently caulked. There was a risk that a problem of brazing would occur.
[0004]
An object of the present invention is to enable a bypass pipe to be securely held and fixed at a predetermined position without being affected by a caulking condition or an in-furnace attitude in a heat exchanger provided with a bypass pipe.
[0005]
[Means for Solving the Problems]
The heat exchanger according to the present invention includes a plurality of vertical flat hollow portions each having a substantially U-shaped fluid passage as viewed from the side and disposed at predetermined intervals in the left-right direction. A first header portion extending in the left-right direction so that the front ends of the fluid passages in the flat hollow portion communicate with each other, having a fluid introduction hole at one end and closed at the other end, and after the fluid passages in all the flat hollow portions A second header portion that extends in the left-right direction so that the ends communicate with each other, has a fluid discharge hole at one end, and is closed at the other end, so that the fluid flows in a meandering manner in the heat exchanger body In addition, at least one vertical partition wall is provided in each header portion, and a bypass pipe having a flange at one end is inserted across the fluid introduction hole of the first header portion and the fluid passage hole formed in the vertical partition wall. and, heat exchanger body, the side The even number of intermediate plates provided with a substantially U-shaped fluid passage forming recess and a pair of header forming recesses that are connected to the front and rear ends of the recess and deeper than the recess are formed in the header forming recesses. It is formed by brazing so that the bottom walls overlap each other, and by brazing the side plate to the intermediate plates on both the left and right ends, and through holes are formed on both front and rear sides of the upper end of one side plate, A reinforcing plate having two front and rear through holes corresponding to these through holes is brazed to the outer surface of the upper end of one side plate, the front through holes of both plates constitute a fluid introduction hole, and the rear through holes are constitutes a fluid discharge hole, the through hole peripheral portion of the front of the reinforcing plate, annular inward protrusion that protrudes in the first header portion is formed, the fluid introducing passage Oyo Conduit connection having at least a fluid introduction passage of the fluid discharge passages, and an annular step portion that can receive a flange of a bypass pipe or an arc-shaped step portion that can receive a part of the flange at the inner end portion of the fluid introduction passage The member is brazed to the reinforcing plate so that the flange of the bypass pipe is sandwiched between the stepped portion thereof and the fluid introduction hole edge portion of the first header portion.
In the heat exchanger according to the present invention, the reinforcing plate may be formed of an aluminum double-sided brazing sheet .
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described below with reference to FIGS.
[0007]
In this embodiment, the present invention is applied to an evaporator for a car air conditioner. In the illustrated evaporator (1), the evaporator main body (2) has a plurality of vertical flattened parts having substantially U-shaped refrigerant passages (3A) as viewed from the side and arranged at predetermined intervals in the left-right direction. It extends in the left-right direction so that the hollow portion (3) and the front ends of the refrigerant passages (3A) of all the flat hollow portions (3) communicate with each other, has a refrigerant introduction hole (4A) on the left end, and the right end is closed. The first header part (4) and the rear ends of the refrigerant passages (3A) of all the flat hollow parts (3) extend in the left-right direction and have a refrigerant discharge hole (5A) at the left end. And a second header portion (5) whose right end is closed. In addition, one vertical partition wall (41) (51) is provided in each header part (4) (5) so that the refrigerant flows in a meandering manner in the evaporator body (2), and A bypass pipe (6) having a flange (61) at the left end is inserted across the refrigerant introduction hole (4A) of the first header section (4) and the refrigerant passage hole (4B) formed in the vertical partition wall (41). ing. An arc-shaped step portion having a refrigerant introduction passage (7A) and a refrigerant discharge passage (7B) and capable of receiving a part of the flange (61) of the bypass pipe (6) at the inner end of the refrigerant introduction passage (7A) ( 70) so that the pipe connecting member (7) can sandwich the flange (61) between the step (70) and the edge of the refrigerant introduction hole (4A) of the first header (4). It is fixed to the evaporator body (2).
[0008]
The evaporator body (2) is a U-shaped refrigerant passage forming recess (81) viewed from the side and a pair of header sections that are connected to both front and rear ends of the recess (81) and deeper than the recess (81). An even number of intermediate plates (8) having recesses (82) are joined so that the bottom walls of these header-forming recesses (82) are overlapped, and side plates are attached to the intermediate plates (8) at both left and right ends. It is formed by joining plates (9).
[0009]
Each intermediate plate (8) has a horizontally oblong refrigerant passage hole (82A) formed in the bottom wall of the header portion forming recess (82) except for a part of which will be described later. A bottom wall of the first header portion forming recess (82) in the intermediate plate (8) located slightly near the right end from the center of the evaporator body (2) is smaller than the refrigerant passage hole (82A) and has a bypass pipe ( A circular coolant passage hole (82B) having a diameter slightly larger than the outer diameter of 6) is formed, and the bottom wall constitutes a vertical partition wall (41) of the first header section (4). A circular coolant passage hole (82B) is formed in the bottom wall of the first header portion forming recess (82) in the two intermediate plates (8) located approximately in the middle between the center and the left end of the evaporator body (2). A plurality of small circular coolant passage holes (82C) are formed around the hole (82B). The bottom wall of the second header forming recess (82) in the intermediate plate (8) located slightly toward the left end from the center of the evaporator body (2) has no refrigerant passage hole, and the bottom wall is 2 constitutes a vertical partition wall (51) of the header section (5).
[0010]
Inner fins (10) made of corrugated fins are disposed and fixed on the two vertical parts in the front and rear of the substantially U-shaped refrigerant passage (3A) of each flat hollow part (3) (see FIG. 5).
[0011]
A circular through hole (9A) is formed in front of the upper end of the left side plate (9), and a horizontally long circular through hole (9B) is formed in the rear side thereof. A reinforcing plate (11) having two through holes (11A) and (11B) corresponding to these through holes (9A) and (9B) is joined to the outer surface of the upper end of the left side plate (9). . An annular inward projecting portion (111) projecting into the first header portion (4) is formed at the peripheral portion of the front circular through hole in the reinforcing plate (11). The front through holes (9A) and (11A) of these plates (9) and (11) constitute the refrigerant introduction hole (4A), and the rear through holes (9B) and (11B) constitute the refrigerant discharge hole (5A). ing.
[0012]
The conduit connecting member (7) includes a plate-like member (71) and a block-like member (72). As shown in FIGS. 1 and 2, the plate-like member (71) has a substantially home base shape in which the lower part is tapered downward as viewed from the side. This plate-like member (71) has a front refrigerant passage (71A) having one end opened at the upper front corner of the inner surface of the member and the other end opened at the lower end of the outer surface of the member, and one rear end of the inner surface of the member. A rear refrigerant passage (71B) having an opening at the corner and the other end opened at the center of the outer surface of the member, and the front refrigerant passage (71A) communicates with the first header portion (4). The passage (71B) is joined to the outer surface of the reinforcing plate (11) so as to communicate with the second header portion (5). The arc-shaped step (70) is formed at the inner end of the front refrigerant passage (71A) of the plate-like member (71). As shown in FIGS. 1 and 2, the block-shaped member (72) has a substantially vertically long cross section. This block-shaped member (72) has horizontally penetrating refrigerant passages (72B) (72A) at the upper and lower portions thereof, and the upper refrigerant passage (72B) is the rear refrigerant passage (71B) of the plate-like member (71). ) And the lower refrigerant passage (72A) is fixed to the outer surface of the plate member (71) so as to communicate with the front refrigerant passage (71A) of the plate member (71). The front refrigerant passage (71A) and the lower refrigerant passage (72A) of these members (71) and (72) constitute a refrigerant discharge passage (7A), and the rear refrigerant passage (71B) and the upper refrigerant passage (72B). A refrigerant discharge passage (7B) is formed. An annular conduit insertion port (721) projecting outward is provided at the outer peripheral edge of the upper and lower refrigerant passages (72A) (72B) of the block-shaped member (72). An O-ring (12) is fitted in these conduit insertion ports (721).
[0013]
Outer fins (13) made of corrugated fins are interposed between adjacent flat hollow portions (3) and joined to the outer surfaces of the flat hollow portions (3). Left side plate (9) Both horizontal bent portions (14A) tips of the bent plate (14) having horizontal bent portions (14A) at both upper and lower ends are joined to the outer surface, and both plates (9) (14) Outer fins (13) made of corrugated fins are interposed between the plates (9) and (14). Further, the outer surface of the right side plate (9) has a horizontal bent portion (15A) at both upper and lower end portions and a vertical bent portion (15B) bent upward from the tip of the upper horizontal bent portion (15A). Both horizontal bent portions (15A) of the bent plate (15) and the inner end of the vertical bent portion (15B) are joined, and outer fins (13) made of corrugated fins are interposed between the plates (9) and (15). The two plates (9) and (15) are joined to the facing surfaces.
[0014]
Among the components of the evaporator (1), the intermediate plate (8), the side plate (9), the reinforcing plate (11), and the bent plates (14) and (15) are formed from an aluminum double-sided brazing sheet. .
[0015]
As indicated by arrows in FIG. 3, the refrigerant exchanges heat with the air flowing between the adjacent flat hollow portions (3) while flowing in a meandering manner in the evaporator body (2). Cool the air. Specifically, first, the refrigerant is introduced from the conduit (not shown) into the first header section right section (4R) through the coolant introduction passage (7A) and the bypass pipe (6) of the conduit connection member (7). . The introduced refrigerant passes through the refrigerant passage (3A) of the flat hollow portion (3) connecting the two compartments (4R) and (5R) from the compartment (4R) toward the right compartment (5R) of the second header portion. Next, the refrigerant passage (3A) of the flat hollow portion (3) connecting the two compartments (5R) (4L) from the second header portion right compartment (5R) toward the first header portion left compartment (4L) ), And the refrigerant passage in the flat hollow portion (3) communicating the two compartments (4L) and (5L) from the first header left compartment (4L) toward the second header left compartment (5L) After flowing through (3A), it is discharged through the refrigerant discharge passage (7B) of the conduit connecting member (7).
[0016]
The evaporator (1) is assembled as follows, for example. That is, first, the intermediate plate (8), the side plate (9), the reinforcing plate (11), the bent plate (14) (15), the inner fin (10), the outer fin (13), the plate-like member (71) Then, the bypass pipe (6) is temporarily assembled using a jig. At this time, the bypass pipe (6) has its flange (61) sandwiched between the arc-shaped step part (70) of the plate-like member (71) and the edge of the refrigerant introduction hole (4A) of the first header part (4). Since it is worn, it is easily positioned, and there is no misalignment even if it is not particularly caulked. Next, the temporarily assembled parts are brazed in a furnace. At this time, the displacement of the bypass pipe (6) does not occur regardless of the position in the furnace. Thereafter, the block member (72) is fixed to the plate member (71) with a set screw or the like. Thus, the assembly of the evaporator (1) is completed.
[0017]
【The invention's effect】
As described above, in the heat exchanger according to the present invention, the conduit connecting member is attached to the reinforcing plate so that the flange of the bypass pipe can be sandwiched between the annular step portion or the arc-like step portion and the fluid introduction hole edge portion of the first header portion. Since it is brazed, there is no possibility of causing a positional deviation of the bypass pipe and a manufacturing defect caused by the positional deviation in the manufacturing process. Moreover, since it is not necessary to temporarily fix the bypass pipe by caulking, the manufacturing process can be reduced accordingly.
[Brief description of the drawings]
FIG. 1 is a perspective view of an evaporator for a car air conditioner showing an embodiment of the present invention.
FIG. 2 is a left side view of the evaporator.
FIG. 3 is a cross-sectional view of the evaporator taken along line III-III in FIG.
FIG. 4 is an enlarged view showing a part of FIG. 3;
FIG. 5 is an exploded perspective view showing an intermediate plate and an inner fin of the evaporator.
[Explanation of symbols]
(1)… Evaporator (heat exchanger)
(2)… Evaporator body (heat exchanger body)
(3) ... Flat hollow part
(3A) ... Refrigerant passage
(4) ... 1st header
(4A)… Refrigerant introduction hole (fluid introduction hole)
(41)… Vertical partition wall
(41B) ... Refrigerant passage hole (fluid passage hole)
(5) ... 2nd header
(5A) ... Refrigerant discharge hole (fluid discharge hole)
(51)… Vertical partition wall
(6)… Bypass pipe
(61)… Flange
(7)… Conduit connection member
(7A)… Refrigerant introduction passage (fluid introduction passage)
(7B)… Refrigerant discharge passage (fluid discharge passage)
(70)… Arc step

Claims (2)

The heat exchanger main body has a substantially U-shaped fluid passage when viewed from the side and a plurality of vertical flat hollow portions arranged at predetermined intervals in the left-right direction, and front ends of the fluid passages of all the flat hollow portions The left and right sides extend so as to communicate with each other, the first header portion having a fluid introduction hole at one end and the other end closed, and the rear ends of the fluid passages of all the flat hollow portions communicate with each other. A second header portion extending in the direction and having a fluid discharge hole at one end and closed at the other end, and at least one in each header portion so that the fluid flows in a meandering manner in the heat exchanger body. A bypass pipe provided with a vertical partition wall and having a flange at one end is inserted across the fluid introduction hole of the first header portion and the fluid passage hole formed in the vertical partition wall,
The heat exchanger main body includes an approximately U-shaped fluid passage forming recess and an even number of intermediate plates provided with a pair of header forming recesses that are connected to both front and rear ends of the recess and deeper than the recess. And brazing so that the bottom walls of the recess for forming the header portion overlap each other, and by brazing the side plates to the intermediate plates on both the left and right ends,
Through holes are formed on both front and rear sides of the upper end of one side plate, and a reinforcing plate having two front and rear through holes corresponding to these through holes is brazed to the outer surface of the upper end of one side plate. The front through hole constitutes a fluid introduction hole, and the rear through hole constitutes a fluid discharge hole,
An annular inward protruding portion that protrudes into the first header portion is formed on the peripheral edge of the through hole on the front side of the reinforcing plate,
An annular step portion that has at least a fluid introduction passage of the fluid introduction passage and the fluid discharge passage and can receive a flange of the bypass pipe is provided at an inner end portion of the fluid introduction passage, or an arc-shaped step portion that can receive a part of the flange. A heat exchanger in which the conduit connecting member is brazed to the reinforcing plate so as to sandwich the flange of the bypass pipe between the step portion thereof and the fluid introduction hole edge of the first header portion. The heat exchanger according to claim 1, wherein the reinforcing plate is formed of an aluminum double-sided brazing sheet .

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