JPH0631334Y2 - Heat exchanger - Google Patents

Description

TECHNICAL FIELD The present invention relates to a heat exchanger used for, for example, a car heater or the like.

2. Description of the Related Art Conventionally, a heat exchanger of this type has been arranged in parallel and has a plurality of fluid passages, as shown in FIG. 3, for example.
Two parallel flat tubes (21), corrugated fins (23) joined to the flat tubes (21) and housed in the ventilation gap (22) between the flat tubes (21), It is composed of the headers (24) and (25), and the partition wall (2
6) is provided so that the left header (24) communicates with the four flat tubes (21), respectively, and the lower fluid introduction header section (24A) and the upper fluid that also communicates with the four flat tubes (21). Discharge header section (2
4B), the fluid introduction header part (24A) is connected to the outer wall of the fluid inlet pipe (27), and the fluid discharge header part (24B) is attached to the outer wall of the fluid discharge pipe (28). ) Was connected. According to this conventional heat exchanger, since the flat tubes (21) are connected to the inner wall of the fluid introduction header portion (24A) at a relatively wide interval corresponding to the ventilation gap, the fluid introduction tube ( As shown in FIG. 4, the fluid such as hot water or steam introduced into the header section (24A) from 27) is a fluid introduction pipe.
Two flat tubes (21B) and (21C) near the center, which are opposite to (27), flow in a large amount and are separated from the fluid introduction tube (27).
Little flow into (21A) (21D). Also the middle right header
In (25), the fluid whose flow changed from below to above flows into the flat pipe (21E) near the fluid introduction header (24A) most as shown in FIG. Tube (21
F), (21G), and (21H), the flow rate decreased gradually.

However, in such a conventional heat exchanger, since the flow rate of the fluid is different in each flat tube (21), a temperature difference occurs due to the difference in the flow rate, and the heat exchange efficiency is extremely high. There was the problem of being bad.

The object of the present invention is to solve the above-mentioned problems of the prior art, to allow the fluid to be evenly distributed from at least three flat tubes to be fed from the fluid introduction tube, and to detect the difference in the flow rate of the fluid in each flat tube, that is, the temperature. There is a desire to provide a heat exchanger that can eliminate the difference and thereby significantly increase heat exchange efficiency.

Means for Solving the Problems In order to achieve the above object, the present invention has at least three flat tubes having a plurality of fluid passages and a fluid introduction tube connected to one side wall and facing the one side wall. The other side wall is provided with a box-shaped fluid distribution header in which flat tube end insertion holes are formed at narrow intervals, and a fluid discharge header in which a fluid discharge tube is connected to one side wall. Are arranged so that a large ventilation gap corresponding to the height of the corrugated fins is formed between those adjacent to each other, and the end portions of the flat tubes on the fluid introduction side are bent into an approximately L shape, respectively. The end parts of the flat tubes are gathered so as to have a narrow gap to each other and inserted into the insertion holes of the fluid distribution header, and the ends of the flat tubes on the fluid discharge side are connected to the other side wall of the fluid discharge header with a wide gap. Heat exchange The main point is the vessel.

Embodiment Next, an embodiment of the present invention will be described with reference to the drawings.

In this specification, the front and rear and the left and right are based on FIG. 1, the front means the front side of the drawing sheet of FIG. 1, the rear means the same back side, the left means the left side of the figure, and the right means the right side. I will say.

1 and 2 showing an embodiment of the present invention, the heat exchanger according to the present invention has four fluid passages (3).
Flat pipe made of aluminum extruded material (1) and a flat pipe with a narrow gap in the right side wall (6) which is connected to the fluid introduction pipe (8) on the left side wall (5) and faces the left side wall (5) Box-shaped fluid distribution header (4) with end insertion holes (7) and left side wall (11)
And a fluid discharge header (10) to which a fluid discharge pipe (9) is connected. All the flat tubes (1) are arranged so that a wide ventilation gap (2) is created between adjacent flat tubes, and each flat tube (1) is bent in a substantially U shape when viewed from the front. The flat pipe (1) has a fluid introduction end (1a) which is bent into a substantially L shape so that the flat pipe end insertion hole (7) of the right side wall (6) has a similar space. Of the flat pipe (1) on the fluid discharge side of the flat pipe (1).
Right wall of fluid discharge header (10) with wide spacing (1b)
It is connected to (13).

In the above heat exchanger, the fluid such as hot water and steam introduced into the fluid distribution header (4) through the fluid introduction pipe (8) is inserted into the insertion hole (7) at a narrow interval from each other. Since the ends (1a) of the flat tubes (1) are closer to the openings of the fluid introduction pipes (8), the fluid is evenly distributed to the ends (1a) of the flat tubes (1). Flat pipe that bends in a U-shape when viewed from the front while maintaining the flow rate.
The fluid discharge header (10) passes through the inside of (1) and is discharged from the fluid discharge pipe (9). During this time, each flat tube
The fluids flowing in the fluid passage (3) of (1) do not mix with each other, so the flow rate in each flat tube (1) becomes uniform and passes through the ventilation gap (2) from the front of the heat exchanger. The wind
The heat is uniformly exchanged with the fluid in the flat tubes (1) through the wall of each flat tube (1) and the corrugated fins (12).

Although four flat tubes (1) are used in the above embodiment, at least three flat tubes (1) may be used. Further, in the illustration, the flat tube (1) is bent in a substantially U shape when viewed from the front, but the flat tube (1) is except for the part inserted into the insertion hole (7) of the fluid distribution header (4). May be arranged linearly and in parallel.

The heat exchanger according to the present invention is used not only as a car heater but also as various heat exchangers for exchanging heat between a fluid such as hot water or steam and air (wind).

Advantageous Effect of the Invention As described above, the heat exchanger according to the present invention has at least three flat tubes having a plurality of fluid passages and a fluid introduction tube connected to one side wall, and a narrow side wall opposite the one side wall. It is equipped with a box-shaped fluid distribution header with flat tube end insertion holes formed at intervals and a fluid discharge header with a fluid discharge tube connected to one side wall, and the flat tubes are adjacent to each other. The flat pipes are arranged so that a wide ventilation gap corresponding to the height of the corrugated fins is created between the mating members, and the end portions of these flat tubes on the fluid introduction side are bent into a substantially L shape, and their tip portions are bent. Collected at narrow intervals to each other and inserted into the insertion holes of the fluid distribution header, and the ends of the flat tubes on the fluid discharge side are connected to the other side wall of the fluid discharge header with a wide interval. And especially for flat tubes Since the fluid introduction side end portions are bent in a substantially L shape and the tip portions thereof are gathered so as to have a narrow interval with each other and inserted into the insertion holes of the fluid distribution header, The fluid can be evenly distributed and sent to at least three flat tubes via the distribution header, and the difference in the flow rate of the fluid in each flat tube, that is, the temperature difference can be eliminated, so that the heat exchange efficiency is significantly increased. The effect that can be achieved.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention, in which a header portion is cut out. FIG. 2 is a partially enlarged perspective view of a flat tube with corrugated fins. FIG. 3 is a front view showing a conventional example, in which the header portion is cut out. FIG. 4 is a graph showing the flow distribution of the flat tubes in the inlet side portion of the conventional heat exchanger, and FIG. 5 is a graph showing the flow distribution of the flat tubes in the outlet side portion. (1) ... flat pipe, (1a) ... fluid introduction side end, (1b) ... fluid discharge side end, (2) ... ventilation gap, (3) ... fluid passage, (4) ... fluid distribution header, (5) ... left side wall (one side wall), (6) ... right side wall (other side wall), (7) ... flat pipe end insertion hole, (8) ... fluid introduction pipe,
(9) ... Fluid discharge pipe, (10) ... Fluid discharge header, (11) ... Left side wall (one side wall), (13) ... Right side wall (other side wall).

Claims (1)

[Scope of utility model registration request] 1. At least three flat tubes (1) having a plurality of fluid passages (3) and a fluid introduction pipe (8) connected to one side wall (5) and facing one side wall (5). A box-shaped fluid distribution header (4) having flat pipe end insertion holes (7) at a narrow interval on the other side wall (6) and a fluid discharge pipe (9) on one side wall (11). With a connected fluid discharge header (10)
(1) are arranged so that a wide ventilation gap (2) corresponding to the height of the corrugated fins (12) is created between those adjacent to each other, and the ends of the flat tubes (1) on the fluid introduction side are arranged. Part (1a)
Are bent into a substantially L-shape, and the tips of them are collected so as to have a narrow space therebetween, and are inserted into the insertion holes (7) of the fluid distribution header (4), and the flat tube
A heat exchanger in which the fluid discharge side end (1b) of (1) is connected to the other side wall (13) of the fluid discharge header (10) with a wide interval.