JPH0645189Y2 - Heat exchanger - Google Patents

Description

[Detailed description of the device]

[0001]

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

[0002]

2. Description of the Related Art For example, as a heat exchanger used for a car air conditioner condenser, a porous extruded flat tube such as a harmonica tube is bent in a meandering shape,
A so-called serpentine type heat exchanger in which fins are arranged between the parallel portions to form a core has been used. However, in such a serpentine heat exchanger, since the heat exchange medium passage is formed by one flat extruded tube, a large passage area cannot be secured, and the extruded tube is bent in a meandering shape. Since the radius of curvature of the bent portion cannot be reduced by more than a certain value, the tube pitch cannot be reduced, which reduces the number of fins interposed between the parallel portions of the tube, resulting in poor fin efficiency. There was a limit to the improvement.

Therefore, as a heat exchanger to replace the serpentine type, there has been proposed a heat exchanger in which flat tubes and fins are alternately stacked and both ends of the tubes are connected to a pair of hollow headers. According to this heat exchanger, since the tube pitch can be freely selected, a large refrigerant passage cross-sectional area can be secured, the number of fins interposed between the tubes can be increased, and the heat exchanger is small and has excellent heat exchange efficiency. You can

By the way, in this type of heat exchanger, a partition plate is provided to divide one or both of the headers into a plurality of partition chambers in order to make the heat exchange medium flow in a meandering manner like the serpentine type. However, the heat exchange medium passage formed by the tube may be formed in a meandering passage.

Conventionally, as such a partition plate mounting structure, a header is composed of a plurality of short tubular header units, and these header units are combined in the longitudinal direction with a partition plate interposed therebetween, and brazing is performed. A fixed structure,
Alternatively, a structure in which a slit-shaped cut portion is formed in the circumferential wall of a single cylindrical header and a partition plate is inserted into this and fixed by brazing (for example, Japanese Patent Laid-Open No. 62-131195) is adopted. It had been.

[0006]

[Problems to be Solved by the Invention] However, in the former structure described above, there is a risk that the number of parts will increase and the cost will increase, and that the header unit and the partition plate will be displaced during brazing. However, the brazing work is troublesome and the productivity is poor.

In the latter structure, after the partition plate is inserted into the slit-shaped cut portion and temporarily set,
In the handling process until this is brazed and fixed, the partition plate often comes off from the notch or shifts in position, and the normal mounting state is often not realized, and the number of partition plates mounted is large. The higher the rate, the higher the defective product generation rate of the manufactured heat exchanger.

The present invention is intended to provide a heat exchanger adopting a partition plate mounting structure which does not cause the above-mentioned drawbacks.

[0009]

In this invention, a plurality of tubes (1) and corrugated fins (2) are laminated in an alternating arrangement, and each tube has a pair of hollow headers ( 3) A heat provided with a partition plate (10) for partitioning at least one of the insides of the headers so that the heat exchange medium flows in a meandering manner in a flow passage formed by the tubes (1) and connected to (4). In the exchanger, the slits (11) in the circumferential direction are formed in the headers (3) and (4), while the partition plate (10) conforms to the inner peripheral surface of the header. Shield to block the inside (10
a) and an attaching convex edge portion (10b) extending outward from a part of the peripheral edge of the shielding portion (10a) and located inside the slit-like cut portion (11) of the header to fill the cut portion. And a concave and convex rough surface portion (10c) is formed on at least one side of the mounting convex edge portion (10b) to prevent the partition plate (10) from being forced into the header from the cut portion (11). A heat exchanger characterized by being fitted and integrated with a header in a state where the rough surface portion (10c) is frictionally pressure-welded to the inner surface of the cut portion (11). Is.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the structure of the present invention will be explained based on an embodiment applied to a condenser made of aluminum or its alloy for car air conditioners.

In FIGS. 1 to 5, (1) is a plurality of tubes arranged vertically in a horizontal state, and (2) is a corrugated fin interposed between adjacent tubes (1) and (1). Is. The tube (1) is composed of a flat extruded shape member made of an aluminum material.
The tube (1) may be of a so-called harmonica tube, which is a porous type. Further, an electric resistance welded tube may be used instead of the extruded mold material. The corrugated fin (2) has almost the same width as the tube (1) and is joined to the tube by brazing. The corrugated fin (2) is also made of aluminum, and it is preferable to use a louver cut and raised.

(3) and (4) are left and right headers. These headers (3) and (4) are each formed of an aluminum electric resistance welded tube having a circular cross section, in which a brazing material layer is formed on both inner and outer surfaces of the core material. An extruded shape material may be used instead of the electric resistance welded tube. Tube insertion holes (5) are formed in each header at intervals along the length direction, and both ends of each tube (1) are inserted into the holes,
And it is firmly joined and connected by brazing. Further, a refrigerant inlet pipe (6) is connected to the upper end of the left header (3) and a refrigerant outlet pipe (7) is connected to the lower end thereof. Lid pieces (12) and (13) are attached to the upper and lower ends of the right header (4), respectively. Further, the left header (3) has two partition plates (10), one at each position above and below the center of the left header (3).
(10) is provided so that the inside of the header is partitioned into three chambers, while the right header (4) is also provided with a partition plate (10) at approximately the center thereof so that the inside of the header is partitioned into two chambers. By installing the partition plate (10), the refrigerant flowing from the refrigerant inlet pipe (6) into the left header (3) circulates in a meandering manner over all the refrigerant passages constituted by the tube group, and from the refrigerant outlet pipe (7). It is supposed to be leaked. The second
(8) and (9) shown in the figure are upper and lower side plates arranged outside the outermost corrugated fin (2).

The partition plate (10) is attached to the headers (3) and (4) as follows. That is, as shown in FIG. 1, headers (3) (4)
A slit-shaped notch (11) having a width substantially equal to the thickness of the partition plate (10) is formed at a position where the partition plate (10) is to be attached, over substantially half the circumference thereof. On the other hand, the partition plate (10) has an outer diameter equal to the inner diameter of the headers (3) and (4), and is fitted to the inner peripheral surface of the header to shield the inside of the header in a transverse manner; In a region extending over about half the circumference of the shielding part (10a), it extends outward from the peripheral edge of the shielding part (10a) and is positioned in the slit-like cut part (11) of the header (3) (4) to be embedded therein. Convex edge (10
b) formed with.

The partition plate (10) has a rough surface portion (10c) formed on the entire surface thereof, which is made of fine unevenness for preventing slip-out. This rough surface (10c
) Is formed by sandblasting, knurling, brushing, pressing or the like. The partition plate (10) having such a rough surface portion (10c) is press-fitted into the cut portion (11) of FIG. 1 so that the fine unevenness causes friction with the upper inner surface of the cut portion (11). It comes into pressure contact with and engages with each other to achieve a retaining effect. Therefore, it is sufficient that the rough surface portion (10c) is formed on at least one side of the mounting convex edge portion (10b) of the partition plate (10), but it is advantageous in terms of manufacturing to form it on the entire surface as shown in the embodiment. Is.

By the way, the partition plate (10) is forcibly fitted to the cut portion (11) as described above. In this fitted state, the uneven rough surface portion (10c) is on the upper surface of the cut portion (11). When friction welded, it performs a non-slip function. Therefore, the partition plate (10) is in this state the header (3)
When the brazing is fixed to (4), the uneven plate surface (10c) prevents the partition plate (10) from slipping out and misaligning even during brazing, and the partitioning is performed properly after the brazing, so that the partitioning can be done after brazing. The plate (10) and the headers (3) and (4) are joined and integrated without a gap, and the outer peripheral surface of the header and the outer peripheral surface of the mounting convex edge portion (10b) of the partition plate (10) are aligned, It has a curved surface with no irregularities and does not impair the appearance.

In the above embodiment, the header (3)
Although (4) has a circular cross section, it does not have to have a circular cross section.

[0017]

As described above, in the heat exchanger according to the present invention, a circumferential notch is formed in the header as a mounting structure of a partition plate that partitions the inside of the header in order to allow the heat exchange medium to flow in a meandering manner. In addition, the partition plate is provided with a rough surface portion for preventing slip-out that is frictionally pressed against the inner surface of the cut portion,
This is a structure in which the partition plate is forcibly inserted into the header from the cut portion and the roughened rough surface portion is pressed into contact with the inner surface of the cut portion and joined and integrated with the header. Therefore, the header can be manufactured integrally, and the number of parts can be reduced as compared with the conventional case where a short header unit is joined in the middle with a partition plate interposed therebetween. Moreover,
Since the partition plate retaining means is formed as an uneven rough surface formed on the plate surface of the partition plate, it is easy to process itself, and the partition plate is fitted by force. Not only can it be performed easily, but after the fitting, the partition plate does not come off or the position is displaced, and the position can be properly regulated through the process after the fitting until the brazing is completed. Therefore, in combination with the decrease in the number of parts, the assembly and joining work can be simplified and the productivity can be improved, and the production yield of products can be improved by reliably preventing the generation of defective products due to the improper mounting of the partition plate. sell.

[Brief description of drawings]

FIG. 1 is a perspective view showing a header, a tube, and a partition plate in a separated state.

FIG. 2 is an overall front view of a heat exchanger.

FIG. 3 is a side view of the same heat exchanger.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

5 is a sectional view taken along line VV in FIG.

[Explanation of symbols]

 1 ... Tube 2 ... Corrugated fins 3, 4 ... Header 10 ... Partition plate 10a ... Shielding portion 10b ... Mounting projection edge portion 10c ... Rough surface portion for retaining 11 ... Cutout portion

Claims (1)

[Scope of utility model registration request] 1. A plurality of tubes (1) and corrugated fins (2) are alternately stacked, and both ends of each tube are connected to a pair of hollow headers (3) (4), and the tubes ( A heat exchanger provided with a partition plate (10) for partitioning at least one of the insides of the header so that the heat exchange medium circulates in a meandering manner in the flow passage constituted by the header (3) ( 4) is provided with a slit-like cut portion (11) in the circumferential direction, while the partition plate (10) includes a shield portion (10a) which fits the inner peripheral surface of the header and shields the inside of the header. A shielding projection (10a) extending outward from a part of the periphery of the shield (10a), and having a mounting convex edge (10b) located in the slit-like cut (11) of the header and filling the cut; At least one side of the convex edge (10b) for mounting has a rough surface A surface portion (10c) is formed, and the partition plate (10) is forcibly fitted into the header from the cut portion (11), so that the rough surface portion (10c) is rubbed against the inner surface of the cut portion (11). A heat exchanger characterized by being integrally joined to a header in a state of being pressed against each other.