JPH02259390A - Pressure loss reducing heat exchanger - Google Patents

Abstract

PURPOSE:To make it smooth for a fluid to flow into a tube and reduce pressure loss by forming an opening end edge of at least one end of a heat exchanger tube on two header plates such that it spreads toward the inside of a inlet header. CONSTITUTION:Opposite ends 51, 52 of a heat exchange tube 5 are arranged so as to penetrate header plates 6, 7 of inlet and outlet headers. Further, a funnel 50 is fitted to the opposite ends of the tube 5 such that an opening end edge 5a is smoothly spreaded toward the insides of the inlet and outlet headers. Hereby, a fluid flow through the inlet and outlet of the tube 5 is made smooth to reduce the pressure loss upon the fluid flowing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a heat exchanger, and particularly to a heat exchanger in which pressure loss of fluid flowing through the heat exchanger is reduced.

[Conventional technology]

Heat exchangers are widely used in various fields.

In automobiles, engine radiators, oil coolers, intercoolers, and air conditioning capacitors are also used.

Used in evaporators, etc.

Conventionally, a heat exchanger used as an intercooler is connected to an inlet header 1 connected to a turbocharger and an engine air supply pipe, as shown in the overall perspective view in Fig. 10 and the longitudinal sectional view in Fig. 11. It has a structure in which the ivy 2 is connected to the connected outlet with a tube 5.

The entrance header 1 side and the outlet header 2 side of the tube 5, which has a flat oval cross section, are attached to the header plate 6 on the entrance header 1 side and the header plate 7 on the outlet header 2 side, respectively. In between.

An outer fin 8 is provided which is exposed to the wind when the car is running.

I would like to introduce an intercooler configured like this.

The air compressed by the turbocharger enters the ivy 1 through the inlet pipe 5 and the inlet, passes through the tube 5 weird to the header plates 6 and 7, enters the outlet header 2, and is guided from the outlet pipe 4 to the engine air supply pipe. but.

On the way, when passing through the tube 5, as shown in FIG.
The heat of the compressed and high-temperature supply air is transferred to the outside air via the actor fins 8, thereby cooling the supply air.

By the way, the attachment K of the tube 5 of such an intercooler to the header plate 6 and the header plate 7 is
rQ as shown in FIG.

Insert the tube 5, whose diameter has been slightly reduced at both ends, into the oval holes provided in the header plates 1 and 6 and the header plate 7, and drive wedges through the openings at both ends of the tube to remove the outside of the tube. A method is adopted in which the wall surface and the inner circumferential surface of the opening of the foot plate are brought into close contact with each other, and these wall surfaces and the circumferential surface are joined and fixed by brazing.

The method for attaching tubes to the header plate in this way is not limited to intercoolers, but is the method used for heat exchangers in general that use tubes and full gate fins.
It is.

[Problem to be solved by the invention]

However, as shown in Figures 11 and 12, the conventional structure of attaching the tube and header plate as described above is that the tube protrudes by a certain length on the inlet and outlet sides of the header plate 1. Because of this structure, a large pressure loss occurs due to the flow of fluid (especially air), which increases fluid flow resistance and causes a significant decrease in heat exchange efficiency. In the case of a cooler, there is a problem that reduces the air filling efficiency of the engine.

The present invention attempts to solve such problems, and aims to provide a pressure loss reduction type exchanger that can reduce pressure loss at the inlet of a tube in a heat exchanger. shall be.

[Means to solve the problem]

In order to achieve the above-mentioned objects, the pressure loss reduction type exchanger of the present invention includes an inlet header connected to an inlet pipe, an outlet header connected to an outlet pipe, and a connection between these inlet header and outlet header. A plurality of heat exchange tubes are arranged in parallel to each other so that two heat exchange tubes are passed through both ends of the tubes, and the open edge of at least one end of the tubes is connected to the inlet. It is characterized by being formed to expand toward the inside of the header.

[For production]

In the pressure loss reduction type exchanger of the present invention described above, the plurality of heat exchange tubes arranged in parallel to each other so as to connect the inlet header and the outlet header are expanded toward the inside of the inlet header. The open edges formed in the tube act to smooth the flow of fluid from the inlet header into the tube.

〔Example〕

Below, a pressure loss reduction type exchanger as an embodiment of the present invention will be explained with reference to the drawings. Fig. 1 is a longitudinal cross-sectional view of the first embodiment, Fig. 2 is an explanatory diagram of its assembly, and Fig. 3 is a longitudinal sectional view of the first embodiment. Second
The vertical cross-sectional view of the actual 3fj example, Figures 4 and 5 are the 3rd
Fig. 4 shows an explanatory diagram of its assembly, and Fig. 5 shows an example.
Figure (a) is its side view.

FIG. 5(b) is a longitudinal sectional view of the same, FIG. 6 is a fourth embodiment thereof, (a) is a side view, (b) is a longitudinal sectional view, and FIG. 7 is a fifth embodiment thereof. (a) is a side view.

(b) is a vertical cross-sectional view, FIG. 8 is a general vertical cross-sectional view of the sixth embodiment, and FIG. 9 is a comparison diagram of the loss coefficient of a typical pipe inlet.

First, let us explain the first embodiment of the 29 present invention.
As shown in the figure, in this example, a conventional heat exchange tube 5
are arranged so as to pass through the header tabs I/-) 6.7 of the inlet and outlet headers, respectively.
It is joined by brazing. And FIG. 2(a),
As shown in (b), an opening edge 5 is attached to both ends of the tube 5.
A is formed by fitting a funnel 50.50 formed to smoothly expand into the inlet header and the outlet header.

2(a) shows a structure in which the cylindrical part 52 of the funnel 50 is press-fitted into the end part 51 of the heat exchange tube 5, and FIG. 2(b) shows the cylindrical part 52 of the funnel 50. 53 shows a structure in which the end portion 51 of the heat exchange tube 5 is press-fitted.

In the first embodiment configured in this way, the tube 5
Since the flow of fluid through the inlet and outlet of the fluid is smoothed, the effect of reducing pressure loss during fluid flow can be obtained.

Next, a second embodiment of the present invention will be described.

As shown in FIG. 3, in this example, the end of the heat exchange tube 5 is arranged so as to pass through the inlet header double l/-) +5, and the open edge 5a of the end of the tube 5 itself is connected to the inlet header. The same applies to the end of the tube 5, which is curved to smoothly expand inward and passes through the header plate 7 of the outlet header. Further, the effect is similar to that of the first embodiment described above. Next, a third embodiment of the present invention will be described. As shown in FIG. 4.5, in this example, only the opening edge 5a of the tube 5 on the inlet header side is curved. The end on the exit header side is constructed in the same manner as the conventional one. In this example, as shown in FIG. 4, the header plate 6 of the tube 5
To assemble the tube 5 to the header plate 7, first attach the end of the tube 5 on the outlet header side to the header plate 6 of the inlet header.
Second, insert the end portion so as to pass through the header plate 7 of the outlet header. Then, the opening edge 5a of the tube 5 is brought into contact with the header plate 6, and the opening edge 5a is joined to the header plate 6 by brazing. This example is compared to the second example described above.

The tube 5 is characterized in that it can be easily assembled to the header plate 6 and the header plate 7.

In addition, the fourth embodiment of the present invention will be explained.

As shown in FIG. 6, in this example, the opening edge 5a of the tube 5 on the inlet header side is not brought into contact with the header plate I/-, but the wall of the tube 5 is brazed to the opening of the header plate B. has been done. The other configurations are similar to the third embodiment described above. In this example, a high level of assembly is characterized in that it does not require precision.

Finally, the fifth embodiment of the present invention will be explained.

As shown in FIGS. 7 and 8, in this example, the opening edge 5b of the tube 5 on the inlet header side is different from the above-mentioned embodiments, and expands only at the upper and lower sides of the oval end. It is formed in a curved manner. The other configurations are the same as those of the sixth embodiment described above. This example is characterized in that the end of the tube 5 can be formed very easily.

According to the expanded curvature of the opening edge in each of the above-described embodiments of the present invention, as shown in the comparison of the loss coefficients in FIG. (
(see FIG. 8(d)): ζ: 0.56 compared to ζ=0.
06 to 0.005 (see FIG. 8(c)), which is an effect of bringing about an order of magnitude lower loss coefficient.

Although several embodiments of the present invention have been described above, the present invention is not limited to the above-mentioned embodiments (individual IB components in each embodiment may be combined with each other). It is also possible.

〔Effect of the invention〕

As described in detail above, according to the pressure loss reduction type exchanger of the present invention, the opening edge of the end of the heat exchange tube is formed so as to expand toward the inlet and into the ivy. Since the inflow of fluid into the tube can be made smooth, an effect can be obtained in that an exchanger with high heat exchange efficiency can be provided.

[Brief explanation of drawings]

1 to 8 show a pressure loss reduction type exchanger as an embodiment of the present invention, FIG. 1 is a longitudinal sectional view of the first embodiment, FIG. 2 is a longitudinal sectional view thereof, and FIG. is a longitudinal sectional view of the second embodiment, FIGS. 4 and 5 show the third embodiment, FIG. 4 is an explanatory diagram of its assembly, and FIG. 5(a) is a side view thereof. Fig. 3(b) is a vertical cross-sectional view of the seventh embodiment, Fig. 6 shows its fourth embodiment, (a) is a side view (bivalent) is a longitudinal cross-sectional view, and Fig. 7 shows its fifth embodiment. (a) is a side view, (b) is a longitudinal sectional view, Fig. 8 is an overall longitudinal sectional view of the sixth embodiment, and Fig. 9 is a loss coefficient of a general pipe entrance. 10 to 13 show a conventional heat exchanger, FIG. 10 is an overall perspective view thereof, FIG. 11 is a vertical sectional view thereof, and FIG. 12 is a partially enlarged perspective view thereof. FIG. 13 is an explanatory diagram of the assembly. 1... Inlet header, 2... Ivy to outlet, 3... Inlet pipe. 4... Outlet pipe, 5... Tube, 5a, 5b...
Open end 43, 6. 7... Header plate, 8...
・7 Uterfin Figure (α) (b) Figure (a) (b) ? Figure (α) t'b) Figure (Q) (b) Cc) (d'1 (e) (f') r 巳0,56 3.Q-1,3 i-Q5÷Q3 cose 〇, 2CO32e Figure 10 Boo diagram ρ

Claims (1)

[Claims] An inlet header connected to an inlet pipe, an outlet header connected to an outlet pipe, and a plurality of heat exchanger tubes arranged in parallel to each other so as to connect these inlet headers and outlet headers. Both ends of the tube are passed through the header plate of the tube, and the opening edge of at least one end of the tube is formed so as to widen toward the inside of the inlet header. vessel.