JPS63233223A - Air conditioner - Google Patents

Abstract

PURPOSE:To make it possible to improve the flow rate characteristic of the air conditioner and to reduce the noise thereof by providing a heat exchanger comprising a plurality of fin groups, and heat transfer tube group of unequal pitches inserted rectangularly into said fin group, on the upstream side of a cross flow fan. CONSTITUTION:In a heat exchanger 4, at a part 10 where a cross flow fan 5 comes near to the heat exchanger 4, the pitch of heat transfer tube groups 9 is set long and the pitches of the entire groups are made unequal. Therefore, since at the long pitch part 10, the passage area becomes large, the speed of the air flow becomes slow. Furthermore, since the collision of the air flow against the heat transfer tube groups 9, noise caused by the collision is eliminated. Further, since disturbance of the rear flow of the heat transfer tube groups 9 does not occur, the disturbance in the inflowing air is reduced and the noise is also reduced. Furthermore, a ventilation resistance becomes large and the flow rate characteristic is improved.

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.

FIG. 6 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 from the suction port 1 passes through the heat exchanger 4 and is blown out toward the blowout [12] by the cross 70-fan 5. The flow at this time is shown in FIG. As shown in the figure, the stabilizer 7 has a thin area. This part has a circular flow. Induced by this thin circulation, the main flow flows from the suction port 11 toward the outlet port 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).

Problems to be Solved by the Invention However, with the above configuration, an obstacle is placed in the flow path, which improves the flow characteristics, but it also suffers from collision noise and noise caused by disturbance of the flow. There was also 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 unequal pitch fins inserted at right angles to the fin groups. It is equipped with a heat exchanger consisting of a group of 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 the air outlet, 3 is the ventilation path, 4 is the heat exchanger H15 is the cross 70
- fan; 7 is a stabilizer; 8 is a fin group; 9 is a heat exchanger tube group; 10 is a long pitch portion of the heat exchanger 4;

The principle of the air conditioner configured as above will be explained below with reference to FIGS. 2 and 3. FIG. 2 is an equal noise diagram when a heat exchanger is provided with heat exchanger tubes of equal pitch. This figure shows an iso-noise diagram of a second-order 2NZ sound, which is a Nz sound of rotation speed N x number of blades 2, which is generally called rotational noise. In the figure, the areas shown in a net shape are
This is the place with the highest noise level. As is clear from this figure, the 2Nz sound is generated from the area where the heat exchanger and crossflow fan are close to each other. Next, the cause of this will be explained with reference to FIG. FIG. 3 is a flow line of an air conditioner having a heat exchanger with equal pitch heat transfer tubes. As can be seen from the figure, the streamlines are dense in the part where the heat exchanger and the cross-flow fan are close to each other. This is the same as the section. In this section, the airflow path is narrow and the flow is large, so the wind speed becomes very high, so the collision speed with the heat transfer tube is also high, which causes noise. .Furthermore, since the flow downstream of the heat transfer tube becomes larger, the degree of turbulence of the flow flowing into the cross-flow fan increases, which also causes noise.Therefore, in this example, the air The heat exchanger 4 of the harmonizer is a cross 7
In a portion 10 where the 0-fan 5 and the heat exchanger 4 are close to each other, the pitch of the heat transfer tube group 9 is set to a long pitch, and the overall pitch is unequal. Therefore, since the passage area becomes large in the long pitch portion 10, the wind speed becomes slow. Furthermore, since there is no collision with the heat exchanger tube group 9, collision noise is also eliminated. Moreover, since the turbulence in the wake of the heat exchanger tube group 9 is eliminated, the turbulence in the air flowing from the cross 70 to the fan 5 is reduced, and the noise is also reduced. Furthermore, the ventilation resistance increases and the flow characteristics also deteriorate.

As described above, according to this embodiment, a heat exchanger consisting of a group of fins and a group of heat transfer tubes with uneven pitches inserted at right angles to the group of fins is provided on the upstream side of the cross flow A-fan. This makes it possible to improve flow characteristics and reduce collision noise and noise caused by flow turbulence.

A second embodiment of the present invention will be described below 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 same figure, the configuration is almost the same as that of the first embodiment, but the pitches of the heat exchanger tube groups 9 of the heat exchanger 4 are different from those of the first embodiment, and are all set at unequal pitches. This means that the pitch is small in parts where the suction wind speed is slow, and it is made large in parts where the suction wind speed is fast. By adopting such a configuration, in addition to obtaining the same effect as the first embodiment in terms of noise,
Since more heat exchanger tubes are inserted than in the first embodiment, there is an effect that the heat exchanger capacity is increased.

Next, a third embodiment will be described with reference to the drawings. FIG. 5 is a sectional view of an air conditioner showing a third embodiment of the present invention. The configuration is the same as the first embodiment except for the heat exchanger 7-'3. The heat exchanger 4 is
In the upper part, heat exchanger tube groups 9 are inserted at equal pitches, and in the lower part, no heat exchanger tube groups 9 are inserted. With this configuration, effects similar to those of the first embodiment can be obtained. Secondly, it is easy to manufacture.

In addition, in the first to third embodiments, the fins in the long pitched portions of the heat exchanger tubes were flat fins, but for manufacturing purposes, it may be more convenient to drill holes at equal pitches. . In this case, if the collar is not placed upright, a hole may be left in place.

Effects of the Invention As described above, the present invention includes, on the upstream side of a cross-flow fan, a heat exchanger comprising a plurality of fin groups and a group of heat transfer tubes with uneven pitches inserted at right angles to the fin groups. In particular, it is possible to improve flow characteristics and reduce collision noise and noise caused by flow turbulence.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of an air conditioner according to the first embodiment of the present invention, Fig. 2 is an equal-noise diagram of the air conditioner, Fig. 3 is a streamline diagram of the air conditioner, and Fig. 4 is a bookmark diagram of the air conditioner. 5 is a sectional view of an air conditioner according to a third embodiment of the invention, FIG. 6 is a sectional view of a conventional air conditioner, and FIG. The figure is a sectional view of essential parts showing streamlines of a conventional air conditioner. 1...Suction port, 2...Blowout [1, 3.
...Ventilation duct, 4...P intersection m'lL 5.
・Backcross flow fan, 8...Fin group, 9・
...Heat transfer tube group. Name of agent: Patent attorney Toshio Nakao and 1 other person/-
= - Suction port 2 - Outlet port 3 - Clear air 4 - Seimatai device δ - Cross flow fan 8 - Fin mante Fig. 1 9-Iunsuisakugunkyo 0 3 / ○ 10° Fig. 2 Fig. 3 l000Hz (zNz 廿) Fig. 4 Fig. 5 Fig. 6 Fig. 14-'' Fig. 7 O? ~, 〆Otsu cheer

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 a group of heat transfer tubes with unequal pitches inserted at right angles to the fin groups.