JPS5941410Y2 - annular heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to an annular heat exchanger of an annular heat exchanger having radial plate fins.

Currently, plate-shaped heat exchangers are mainly used as engine radiators for construction machinery, construction vehicles, etc., but recently annular heat exchangers with radial plate fins have been developed to reduce noise and make the shape smaller. An exchanger is proposed.

FIG. 1 is a diagram showing a conventional annular heat exchanger, and FIG. 2 is a sectional view taken along line AA in FIG.

In the figure, 1° and 2 are tank chambers, and 3 is tank chamber 1.
4 is an outlet pipe provided in the tank chamber 2; 5 is a cap provided on the upper part of the tank chamber 1; 6 is an annular thin tube 7 connecting the tank chamber 1 and the tank chamber 2; Plate fins are attached to the thin tubes 6, and the plate fins 7 are provided radially, and the annular thin tubes 6 and plate fins 7 constitute an annular heat exchanger 8.

9 is a shaft connected to a drive source (not shown), 10 is a fan attached to the shaft 9, and the fan 10 is located on the heat exchanger 8.

In this annular heat exchanger, a fan 10 is
When the fluid to be cooled is supplied into the tank chamber 1 from the inlet pipe 3, the fluid to be cooled is sent to the tank chamber 2 through the annular thin tube 6, but the heat of the fluid to be cooled is transferred to the plate. It is released via the fins 7.

By the way, since the heat exchanger 8 is annular, the interval between the plate fins 7, that is, the fin pitch, is different between the outer circumference and the inner circumference of the heat exchanger 8, and the fin pitch here is different from the outer circumference. If the optimum value is set, the fin pitch will become too small at the inner periphery, resulting in extremely high ventilation resistance, and in annular heat exchangers for construction machinery and construction vehicles, dirt will enter between the plate fins 7. Causes blockage.

Conversely, if the fin pitch here is set to the optimum value based on the inner circumference of the heat exchanger 8, the fin pitch at the outer circumference will become too large, and if the size of the heat exchanger 8 is kept constant, the heat dissipation will be insufficient. The area becomes smaller, and it becomes necessary to increase the size of the heat exchanger 8 in order to obtain the required heat radiation area.

This idea was made in order to solve the above-mentioned problems, and aims to provide an annular heat exchanger that does not increase ventilation resistance, does not cause clogging, and can reduce the size of the heat exchanger. purpose.

In order to achieve this objective, in this invention, in the annular heat exchanger body in which plate-shaped fins are radially attached to the annular tubes, the first fins attached to all the annular tubes and the A second fin having a shorter radial length than the first fin and attached to some of the annular tubes is arranged so that the fin pitch is almost uniform from the inner circumference to the outer circumference. Configure.

FIG. 3 is a diagram showing an annular heat exchanger according to this invention.

In this annular heat exchanger, plate fins with different radial lengths? a, 7b are arranged alternately, the plate fins 7a are attached to all the annular tubes 6, the plate fins 77b are attached to some of the annular tubes 6, and the radial length of the plate fins 7b is is shorter than the radial length of the plate fin 7a.

And plate fins? A line connecting the outer circumferential ends of a and 7b is parallel to the annular thin tube 6, and the inner circumferential ends thereof are uneven in and out.

Therefore, the substantial fin pitch formed by the closest fins for each radius is substantially uniform in the radial direction of the heat exchanger 8.

FIG. 4 is a diagram showing another annular heat exchanger according to this invention.

In this annular heat exchanger, are there plate fins with different radial lengths? a, 7b.

7c are arranged alternately, the plate fins 7c are attached to some of the annular tubes 6, and the plate fins 7c are attached to some of the annular tubes 6.
The radial length of c is shorter than the radial length of plate fin 7b.

And plate fins? A line connecting the outer circumferential ends of a, 7b, and 7c is parallel to the annular thin tube 6, and the inner circumferential ends thereof are uneven in and out.

Therefore, the actual fin pitch formed by the closest fins for each radius is almost uniform in the radial direction of the heat exchanger 8, and the fin pitch is more It can be made uniform.

In this way, plate fins having a plurality of different radial lengths are alternately arranged so that the substantial fin pitch in the radial direction is approximately uniform.

In the above-described embodiment, the heat exchanger 8 is annular, but the heat exchanger may be an elliptic, rectangular, polygonal, or the like.

In this case, this idea can be applied to parts with a small radius of curvature when the ring is elliptical, and can be applied to corners when the ring is rectangular or polygonal.

Furthermore, in the above embodiment, the fan 10 was placed inside the heat exchanger 8 and the cooling air was sent from the inner circumference of the heat exchanger 8 to the outer circumference. It may be sent from the outer circumference to the inner circumference.

Furthermore, the plate fins described above are not limited to flat plate fins, but also include fins with slits, fins with louvers, and the like.

As explained above, in the annular heat exchanger according to this invention, since the fin pitch can be made almost uniform in the radial direction of the heat exchanger, the fin pitch can be made almost uniform from the inner circumference to the outer circumference of the heat exchanger. The fin pitch can be set to the optimum value at any position in the radial direction.

Therefore, the heat exchanger can be made smaller, the ventilation resistance can be reduced, and clogging can be prevented.

Furthermore, since the boundary layer formed on the surface of the plate fin can be peeled off, the heat transfer coefficient on the surface of the plate fin can be improved.

In this way, the effects of this invention are remarkable.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a conventional annular heat exchanger, FIG. 2 is a sectional view taken along line AA in FIG. 1, and FIGS. 3 and 4 are diagrams each showing an annular heat exchanger according to this invention. . 1.2...tank room, 3...inlet pipe,
4... Outlet pipe, 6... Annular thin tube, 7a
, 7b, 7c...Plate fin, 8...
...Heat exchange body, 10...Fan.

Claims (2)

[Scope of utility model registration request] (1) In an annular heat exchanger in which plate-shaped fins are radially attached to annular tubes, the first fin attached to all the annular tubes and the radial direction from the first fin. The second fins are short in length and attached to some of the annular thin tubes, and are arranged so that the fin pitch is almost uniform from the inner circumference to the outer circumference. Annular heat exchanger. (2) Item 1 above. The annular heat exchanger according to claim 1, characterized in that the second fins are arranged alternately.