JPS5818091A - Finned tube type heat exchanger - Google Patents

Abstract

PURPOSE:To raise the efficiency of heat transfer, by employing an arrangement in which the length of fins in the direction of air flow is increased gradually toward the center of a fan and the fins are curved such that their opposite ends are located gradually away from the fan. CONSTITUTION:Curvatures of fins 12 defining a convex curved surface of the back surface B of a heat exchanger are made different from each other. That is, the curvatures are decreased gradually toward the longitudinal center line of the heat exchanger. On the other hand, the surfaces of the fins 12 defining a concave curved surface of a front surface A located on the side of the curved surface are formed flat. Further, the fins 12 are shaped such that their curvatures are reduced from the peripheral portion toward the center along streamlines b of air flow. Resultantly, the fin area is made large at the region of heat exchanger 4 where the velocity of air flow is high, whereas it is made small at the region where the velocity of air flow is low. By thus changing the configuration of the fins according to the velocity of air flow, it is enabled to increase the efficiency of heat transfer as compared with those of the conventional heat exchangers.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a fin-tube heat exchanger in a heat exchange device using a centrifugal blower.The present invention relates to an improvement of a fin-tube heat exchanger in a heat exchange device using a centrifugal blower. One of the objectives is to increase the heat exchange efficiency by reducing the fin area in areas where the flow velocity is slow.

Conventionally, the structure using a centrifugal blower on the indoor side of the well-known air conditioner for cooling only or for both cooling and heating is the first.
The heat exchanger is constructed as shown in the figure, and the heat exchanger is
, c, it was a rectangular parallelepiped. The fins 12C of the heat exchanger 4 are arranged in parallel in a plane at equal intervals, and heat exchange pipes 13C are incorporated depending on the shape of the fins.
゛However, as shown in Figs. 2 and 3, the streamlines in the space 11 on the indoor side of the air conditioner configured as described above are curved and the flow velocity is slow toward the dividing plate 8, but the centrifugal blower Near the suction port of the impeller 6, the streamlines are straight and the flow velocity is high.

Therefore, since the conventional heat exchanger 4 has a rectangular parallelepiped shape, the area of the fins through which air passes is the same regardless of the flow velocity, resulting in low heat exchange efficiency and not an optimal design shape.

Additionally, because all fin features were planar, there were inconsistencies when streamlined. As a result, if the heat exchanger 4 is used in the air conditioner, the static pressure resistance for a given air volume will increase, increasing the required static pressure performance of the centrifugal blower, increasing the size of the centrifugal submersible fan, and increasing the input power. It caused an increase in the size of 3 vanes. Furthermore, passing air along the shape of the fins 12C changes the natural shape of the air streamlines, and cannot be said to provide an optimal heat exchange phenomenon.

The present invention provides a finch blower using the above-mentioned conventional centrifugal blower.
This eliminates the drawbacks of the tube type heat exchanger.

Hereinafter, the present invention will be described with reference to FIGS.
This will be explained with reference to FIG.

As is well known, FIG. 1 shows an indoor main body 1 of an air conditioner that uses a centrifugal blower for cooling only or for both cooling and heating, and is equipped with an inlet 1a and an outlet 1b on the front side.

Then, from the suction port 1a, filter 2, filter stop 3
The air that has passed through is heat exchanged in the heat exchanger 4, and then
The air is sucked in through the suction port of the centrifugal blower while being guided by the fan, passes through the air direction changing vane 10 from the space formed by the dividing plate 8 and the casing 7, and is blown out through the air outlet 1b.

At this time, the condensed water adhering to the heat exchanger 4 is disposed of in the water florescence dish 6. A motor 9 is a power source that rotates the centrifugal blower impeller 6. The above members and the like are appropriately configured to form the indoor side of the air conditioner.

Next, in the side cross-sectional view with the heat exchanger 4 removed in FIG.
Explain. By rotating the centrifugal blower impeller 60 times, the shape of the air streamline in the space 11 becomes as shown in b.

In this way, the streamlines are curved in the vicinity of the dividing plate 8 of the space 11, and are substantially straight in the vicinity of the suction port of the centrifugal blower.

A heat exchanger 4 according to an embodiment of the present invention installed at a predetermined position in this space 11 is shown in FIG.

In the figure, the heat exchanger 4 has a concave curved surface in which the front surface A is smoothly recessed toward the center line of the heat exchanger 4 relative to the front grille. In addition, the back surface B has a convex curved surface with a smooth bulge toward the centrifugal blower near its center. The curved curvatures of the fins 12 forming the convex curved surface B on the back surface are different, and the curved surface side of each fin becomes linear as it approaches the fins near the vertical center line. Further, the shape of each fin 12 changes from a curved shape to a straight shape as it goes from the periphery toward the center along the air streamlines, and the mutual spacing between the fins is appropriately arranged. The heat exchange pipe 13a has a curved shape with appropriate curvature and spacing according to each fin 12, as shown in FIG.

In this way, the fins are formed into an appropriate dimensional shape as a whole so that the fin area is large in the portion where the air flow rate is high, and the fin shape follows the air flow rate.

As a result, the fin area is large in the portion of the heat exchanger 4 where the passing air flow rate is high, and the fin area is small in the portion where the air passing through the heat exchanger 4 is slow.
The heat exchange efficiency is higher than before due to the shape for each flow rate. Furthermore, since the shape of the fins 12 is formed to follow the air streamlines, the ventilation resistance to the predetermined air volume of the heat exchanger 4 is reduced, the required static pressure for the centrifugal blower is reduced, and the blower is made smaller. Furthermore, it promotes lower input power and is superior in terms of energy saving.

This also leads to a more compact air conditioner as a whole.

The shape of the heat exchanger 4 in this embodiment is shown in Fig. 6a.
, b', and c may also be used. That is, in the heat exchanger 4 shown in FIG. 6, the upper curve of the front surface C is a concave curve that is smoothly recessed with respect to the front grille 1 near its center line, but the curved surface of the front surface C is curved according to the flow velocity. It has a smooth bulge toward the center of the curved surface to increase the fin area in the fast part. The back surface is a convex curved surface with a smooth bulge toward the center line of the centrifugal blower. The curve curvature of each fin 12 on the front surface C side becomes smaller toward the vertical center line of the front surface C.

All of the fins 12 on the rear side are straight. The shape and configuration of each fin and the shape and configuration of the heat exchange pipe 13 are the same as those of the heat exchanger 4 in FIG. 4. This heat exchanger/exchanger 4 also provides the same effects as those of the previous embodiment.

Although we have described the case of a converter, its applications are wide-ranging, including forced-air refrigerators.

As is clear from the above embodiments, in the fin-tube heat exchanger according to the present invention, the length of the fins in the ventilation direction gradually increases by 1 as it approaches the center of the blower fan.
The centrifugal blower is shaped so that it has a large airflow, and both ends are curved so as to move away from the blower fan in order to improve heat exchange efficiency and reduce the static pressure required for the centrifugal blower due to the reduction in ventilation resistance for a given air volume. Downsizing of centrifugal blowers,
This product has excellent effects such as promoting low input power and saving energy.

[Brief explanation of drawings]

Figure 1 is a side sectional view of the main part of the indoor side of a well-known air conditioner using a centrifugal blower, and Figure 2 is a side sectional view of the main part of the same air conditioner showing the air flow lines when the heat exchanger is removed. FIG. 3 is a sectional view from the side, FIG. 3 is a sectional view from the plane of the same essential part, and FIGS. 4 a, b, and c are respectively a perspective view, a plan view, and 6a, b, 'c are respectively a perspective view, a top view, and a side view of a fin-tube heat exchanger according to another embodiment of the present invention, and FIGS. 6a, b, and c are respectively a conventional fin-tube heat exchanger. FIG. 3 is a perspective view, a top view, and a side view of a heat exchanger. 4...Fin-chive type heat exchanger, 6...
... Impeller for centrifugal blower, 7... Casing,
8...Bunching plate, 12...Fin, □13...Heat exchange vibrator, A, C...
- Front side of the heat exchanger, B, D... Back side of the heat exchanger. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
I51 (O12 No. 2514 @Figure 4 12 Figure 5 2

Claims (1)

[Claims] A fin-tube heat exchanger is formed in which a large number of fins are arranged at predetermined intervals in a direction perpendicular to the ventilation direction, and a refrigerant pipe passes through each fin, and the length dimension of the fins in the ventilation direction is determined by the ventilation direction. The heat exchanger is formed so that it gradually becomes larger as it approaches the center of the fan.
A fin-tube heat exchanger whose both ends are curved so as to move away from the blower fan.