JPS63233224A - Air conditioner - Google Patents

Abstract

PURPOSE:To improve the flow rate characteristic of the air conditioner and to reduce the noise thereof by providing, on the upstream side of a cross flow fan, a heat exchanger comprising a plurality of fin groups and a plurality of rows of heat transfer tube groups in which the diameter of each heat transfer tube on the downstream side is made smaller than the diameter of each heat transfer tube on the upstream side. CONSTITUTION:A heat exchanger comprising, on the upstream side of a cross flow fan 5, fin groups 8 and a plurality of rows of heat transfer tube groups 10 and 11 inserted rectangularly into said fin groups 8, is provided on the upstream side of the cross fan 5. A vortex which is a circulating flow is produced at the part of a stabilizer 7. Since main stream flows so that it is sucked into the vortex circulating flow, air flows toward the heat transfer tube on the downstream below half pitch from the upstream side heat transfer tube 10. Since the diameter of heat transfer tube 11 is smaller than that of the heat transfer tube 10, the air flow becomes a flow flowing along a wing shape. Accordingly, the turbulence of air flowing into the cross flow fan 5 becomes small and noise is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an air conditioner equipped with a cross-flow fan.

BACKGROUND OF THE INVENTION In recent years, air conditioners have tended to have larger air volumes in order to improve efficiency. For this reason, the development of air conditioners that can produce a large amount of air with low noise has become an important issue.

An example of the conventional air conditioner mentioned above will be described below with reference to the drawings.

The figure shows a sectional view of a conventional air conditioner.

In the figure, 1 is an inlet, 2 is an outlet, 3 is a ventilation path,
4 is a heat exchanger, 5 is a cross flow fan, 6 is a wind direction guide, and 7 is a stabilizer.

The operation of the air conditioner configured as above will be described below. The air sucked in through the suction port 1 passes through the heat exchanger 4 and is blown out toward the blowout port 2 by the cross flow fan 5. The flow at this time is shown in the compensation diagram.

As shown in the figure, the stabilizer 7 has a thin area. This part has a circular flow. Attracted by this thin circulation, the main flow flows from the inlet 1 to the outlet 2.

At this time, the flow is deflected by the wind direction guide 6 so that the collision loss between the flow and the cross flow fan 5 is reduced.

Therefore, compared to the case without the wind direction guide 6, the flow rate performance is improved (for example, Japanese Utility Model Application No. 127394/1983).

3 Problems to be Solved by the Vapor Invention However, with the above configuration, an obstacle is placed in the flow path, which improves the flow characteristics, but it also increases the noise caused by collision noise and turbulence of the flow there. There was a problem in that the noise level also increased.

In view of the above-mentioned problems, the present invention provides an air conditioner with excellent flow characteristics and low noise.

Means for Solving the Problems In order to solve the above problems, the air conditioner of the present invention includes a plurality of fin groups on the upstream side of the cross flow fan, and a plurality of fin groups inserted at right angles to the fin groups on the downstream side. This heat exchanger includes a plurality of rows of heat exchanger tubes in which the diameter of the heat exchanger tubes is smaller than the diameter of the upstream heat exchanger tubes.

Effects The present invention can improve the flow rate characteristics with the above-mentioned configuration, and can also reduce collision noise and noise caused by flow disturbance.

EXAMPLE Hereinafter, an air conditioner according to an example of the present invention will be described with reference to the drawings.

FIG. 1 shows a sectional view of an air conditioner according to a first embodiment of the present invention. In Figure 1, 1 is the suction port, 2
is an air outlet, 3 is a ventilation passage, 4 is a heat exchanger, 5fd cross flow fan, 7 is a stabilizer, 8 is a fin group, 9 is a heat exchanger tube group, 10 is an upstream heat exchanger tube, 11 is a downstream heat exchanger tube .

The operation of the air conditioner configured as described above will be described below with reference to FIGS. 1, 2, and 3.

FIG. 2 shows streamlines of air flow in an air conditioner. As can be seen from the figure, a thin circulation flow occurs in the stabilizer 7 portion. Since the main flow flows as if being attracted by this thin circulation flow, it flows into the upper part of the cross-flow fan 5 and toward the cross-flow fan 5 side. Therefore, in the first embodiment, air flows from the upstream heat exchanger tube 10 toward the downstream heat exchanger tube 11 located half a pitch below. Next, the flow of air around the heat exchanger tubes will be explained. Figure 3 (A) shows the flow field when the diameters of the upstream and downstream heat exchanger tubes are equal.As can be seen from the figure, there is a large turbulence in the wake of the downstream heat exchanger tube arise. On the other hand, in Figure 3 CB),
In this example, the diameter of the downstream heat exchanger tube is smaller than the diameter of the upstream heat exchanger tube, so the flow is as follows:
The flow appears to flow along an irregular shape, and there is little turbulence in the wake of the downstream heat exchanger tube. Therefore, the turbulence of the air flowing into the cross flow fan 5 is reduced, and the noise generated by the turbulence of the inflow air is eliminated.

In addition, since the flow along the heat transfer tube becomes smooth, the flow rate characteristics, which are prone to collision losses, are also improved.

As described above, according to this embodiment, there is a fin group on the upstream side of the cross flow fan, and the diameter of the heat exchanger tube inserted at right angles to the fin group and on the downstream side is smaller than the diameter of the heat exchanger tube on the upstream side. By providing a heat exchanger made up of a plurality of rows of heat transfer tubes, it is possible to improve the flow rate characteristics and reduce collision noise and noise caused by flow turbulence.

6.Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. FIG. 4 is a sectional view of an air conditioner showing a second embodiment of the present invention. In the figure, the configuration is almost the same as the first embodiment, but in this configuration, in the heat exchanger 4, between the upstream heat exchanger tube 10 and the downstream heat exchanger tube 11, the upstream heat exchanger tube is An intermediate heat exchanger tube 12 having a diameter intermediate between the diameter of the heat exchanger tube and the diameter of the downstream heat exchanger tube is provided. Therefore, the flow of air around the heat exchanger tubes is not restricted to the heat exchanger tubes, improving the flow rate characteristics and suppressing the generation of noise due to turbulence of the flow.

As described above, the second embodiment also provides the same effects as the first embodiment.

In this example, a circular tube was used as the heat transfer tube, but the same effect can be obtained even if a flat tube is used.

Effects of the Invention As described above, the present invention includes a plurality of fin groups on the upstream side of a cross flow fan, and a fin inserted at right angles to the fin group,
By having a heat exchanger consisting of multiple rows of heat transfer tubes in which the diameter of the heat transfer tubes on the downstream side is smaller than the diameter of the heat transfer tubes on the upstream side, the flow rate characteristics can be improved. At the same time, collision noise and noise caused by flow turbulence can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an air conditioner according to a first embodiment of the present invention, FIG. 2 is a streamline diagram of the air conditioner, and FIG. 3 is a heat exchanger tube 1.
4 is a sectional view of an air conditioner according to the second embodiment of the present invention, FIG. 5 is a sectional view of a conventional air conditioner, and FIG. 6 is a sectional view of a conventional air conditioner. This is a cross-sectional view of the main parts showing the flow lines of the machine. ,,s...crossflow fan, 8...fin group, 9...heat exchanger tube group,
10 - Upstream heat exchanger tube, 11... Downstream heat exchanger tube. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 3 (A) (B) Figure 4 Figure 5? Figure 6

Claims (1)

[Claims] The heat exchanger includes an inlet, an outlet, a ventilation path connecting the inlet and the outlet, a crossflow fan in the ventilation path, and a heat exchanger upstream of the crossflow fan. The air conditioner consists of multiple fin groups and multiple rows of heat transfer tubes inserted at right angles to the fin groups, with the diameter of the heat transfer tubes on the downstream side being smaller than the diameter of the heat transfer tubes on the upstream side. Machine.