JPH068409Y2 - Air conditioner indoor unit - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an improvement of an indoor unit of an air conditioner used, for example, for heating and cooling the interior of a house.

[Conventional technology]

FIG. 8 is a sectional view showing an indoor unit of a conventional air conditioner. In the figure, (1) is a unit outer box, and (2) is a front inlet of this unit outer box (1). It is a heat exchanger and consists of a plate fin (2a) and a refrigerant pipe (2b). Reference numeral (3) is a blower fan for performing an air blowing action that allows air to pass through the heat exchanger (2), which is an impeller (3a) and a fan casing (3b) of a crossflow fan that is often used in an indoor unit. And a case where it is configured by a driving motor (not shown). Further, (4) shows the state of the pipe wake generated downstream of the heat exchanger (2) by the pipe (2b).

The conventional indoor unit configured as described above has a low temperature or a high temperature that flows in the pipe (2b) when the indoor air sucked by the blowing action of the blowing fan (3) passes through the heat exchanger (2). The heat medium is heat-exchanged with the heat medium to produce low-temperature or high-temperature air, which is continuously blown out into the room through the blower fan (3) and returned. This conventional example is a wall-mounted type, which is the indoor unit of the most common room air conditioner. It allows the blowout flow to be sufficiently directed downward, and secures a piping space for the heat medium and drain at the lower end position of the unit. The blower fan (3) is located somewhere above for the purpose. for that reason,
The impeller (3a) will be located immediately after the heat exchanger (2). In this case, if the gap between the impeller (3a) and the heat exchanger (2) is made too small, the pipe wake (area where there is no air flow)
When the impeller passes through the inside of (4), a large pure tone (rotation speed × number of blades) called a rotation sound is generated, which causes an increase in noise level and a strong discomfort to the user. Fig. 8 shows the case where the impeller (3a) is separated to a position where the wake (4) almost disappears.

On the other hand, in the case of this type of indoor unit, there is also a strong demand for a thinner depth dimension, and since the above-mentioned reduction of rotational noise and thinning are satisfied, the impaired performance of the heat exchanger (2) is sacrificed, and the blade car
There is also an example in which several pipes (2b) near the position (3a) are omitted. (Reference, National Technical Report, Vol.30, N
O.5, pp.664 to 671) [Problems to be solved by the invention] As described above, in the conventional air conditioner indoor unit, the rotation noise is reduced, the depth dimension is reduced, and the heat exchanger is reduced. It was not possible to satisfy all of the effective use of the device at the same time, and we had no choice but to sacrifice one of them.

The present invention has been made to solve the above-mentioned problems, and makes the depth of the indoor unit thin without deteriorating the performance of the heat exchanger, and also sufficiently reduces the rotation noise due to the wake of the pipe. The purpose is to obtain an indoor unit of an air conditioner.

[Means for solving problems]

The indoor unit of the air conditioner according to the present invention comprises a pipe (2
b) A rectifying resistor (5) so as to shrink the wake region (4), and the pipe (2b) near the impeller (3a) of the blower fan (3).
The pipes are provided at the downstream positions of the pipes corresponding to the pipes (2b).

[Action]

The rectifying resistor according to the present invention can make a large wake generated by the pipe of the heat exchanger disappear rapidly due to its contracting action, and even if the impeller is brought close to the heat exchanger. Rotation noise due to the wake of the pipe does not occur, and the unit depth can be reduced. The performance of the heat exchanger is also improved by reducing the area of the pipe wake where there is no air flow.

〔Example〕

 An embodiment of the present invention will be described below.

In Fig. 1, (1) is the unit outer box, (2) is the heat exchanger,
The blower fan (3) is the same as the above-mentioned conventional example.
However, in the plate fin (2a) on the downstream side of the pipe (2b) located close to the impeller (3a), two rectifying resistors, that is, two thin rectifying rods (5) on each side of each pipe, are provided.
Are installed almost parallel to each other at an interval about the outside diameter of the pipe (2b), and the interval between the heat exchanger (2) and the impeller (3a) is greatly reduced, and the depth of the unit outer box (1) is reduced. The difference is that the dimensions are about 10% thinner. In addition, d is the diameter of the straightening rod (5), D is the diameter of the pipe (2b), L is the distance between the straightening rods (5), (6)
Indicates the wake of the straightening rod.

The basic function of each part of the indoor unit configured as described above is the same as that of the conventional example described above, but the added straightening rod (5)
As shown in the figure, the pipe wake (4) is significantly reduced due to the contraction of the flow, and the distance between the heat exchanger (2) and the impeller (3a) is much smaller than in the conventional example. Nevertheless, no rotating noise is generated due to the pipe wake [4]. 2 and 3 show the test results of the rotating sound level SPL when the distance L and the diameter d of the straightening rod (5) are variously changed. The reference value 0 (dB) is the rotational sound level when the straightening rod (5) is omitted in the configuration shown in FIG. From these figures, the rectifying rod (5) has the effect of reducing the rotation noise by about 15 (dB), and the distance L and the diameter d are 0.9 with respect to the pipe outer diameter D, respectively.
It can be seen that a large effect is stably obtained in the region of ≤L / D≤1.8 and d / D≤0.4, but the effect decreases sharply if it deviates from this region. It should be noted that not only rotating noise but also broadband noise can be reduced by uniforming the flow of flow into the impeller.

In addition, the area of the pipe wake (4) where there is no air flow is reduced, so that the performance of the heat exchanger (2) can be improved.

FIG. 4 shows another embodiment of the present invention. In this embodiment, the plate fins (2a) of the heat exchanger (2) are provided with holes for fixing the flow straightening rods (5), thereby omitting parts for mounting and fixing the flow straightening rods (5). It was done. Of course, a small cutout may be used instead of a complete hole as long as it can serve the purpose of fixing.

In addition, although the case where the straightening bar (5) is a round bar has been shown in the above embodiments, the same effect can be expected even if the cross section of the bar has another shape such as a square or a triangle. The same effect can be expected when a thin soft material such as a tape is used and attached to the surface of the heat exchanger. In this case, if the tape is made of a metal material such as aluminum tape, the durability performance is further improved.

FIG. 5 is a sectional view showing an indoor unit of an air conditioner according to another embodiment of the present invention. In this example, a plate fin (2a) is partially deformed as a rectifying resistor, that is, a fin crusher. A section (5) is provided.

Although the basic function of each part of the indoor unit configured as described above is the same as that in the case of FIG. 1, fins formed by partially modifying the shape of the plate fins (2a) of the heat exchanger (2) Due to the contracting action of the crushing part (5), the pipe wake (4) is significantly reduced as shown in the figure, so the heat exchanger (2)
Although the distance between the fan and the impeller (3a) is much smaller than the conventional example, no rotating noise is generated by the pipe wake (4). FIG. 6 shows a detailed view of the vicinity of the fin crushing portion (5), that is, the portion A in FIG. Such a fin crushing part (5) may be formed together when processing the plate fins (2a) one by one, or may be formed at the stage when the heat exchanger (2) is assembled. May be performed, and it can be formed by a simple operation without adding special parts.

The crushing width of such a fin crushing part (5) (1 in FIG. 6)
1) corresponds to the diameter d of the rectifying rod shown in FIG. 1, the characteristics similar to those shown in FIGS. 2 and 3 can be obtained even in this example. That is, in the case of the dimensional relationship shown in FIG. 5, the rotating sound level due to the pipe wake (4) can be reduced by about 15 (dB). Not only rotation noise but also broadband noise can be reduced by uniformizing the inflow flow into the impeller. In addition, the area of the pipe wake (4) where there is no air flow is reduced, so that the performance of the heat exchanger (2) can be improved.

FIG. 7 is an enlarged sectional view showing an essential part of an indoor unit of an air conditioner according to still another embodiment of the present invention. This embodiment shows the fin crushing portion shown in FIGS. 5 and 6.
The rectifying resistor is a cut-and-raised part (5) in consideration of the more accurate molding of the size and shape of (5), and it is necessary to work together when processing each plate fin (2a). , It is sufficient to add a process of making a notch of a predetermined width and bending it.

Further, in the above embodiments, the case where the blower fan (3) is a cross flow fan has been described, but even in the case of other fans such as a propeller fan, the heat exchanger (2) and the impeller (3a) are Similar effects can be expected when they are arranged close to each other.

It should be noted that, even if the rectifying resistor (5) is provided at the downstream position of the pipe (2b) which is not close to the impeller (3a), for example, there is no harm. The performance of the vessel is further improved.

Further, in each of the embodiments, two rectifying resistors (5) are provided for each pipe (2b), but at least one rectifying resistor is provided on each side of the pipe (2b). May be provided, and two or more may be provided. On the contrary, if the space between the pipes (2b) is narrow, the two adjacent pipes
In (2b), it is possible to share one rectifying resistor (5) between both pipes.

[Effect of device]

As described above, according to the present invention, the pipe (2b) wake region
Connect the rectifying resistor (5) to the fan (4) so that it is compressed.
Since the pipes (2b) are provided at the downstream position of the pipe (2b) near the impeller (3a) of (3),
Since the rotating noise can be prevented even when the impeller (3a) is brought close to the heat exchanger (2), the depth of the unit can be reduced and the performance of the heat exchanger can be improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an indoor unit of an air conditioner according to an embodiment of the present invention, FIGS. 2 and 3 are characteristic diagrams showing the rotating sound reducing effect of the unit of FIG. 1, FIG. FIG. 5 is a sectional view showing an indoor unit of an air conditioner according to another embodiment of the present invention, FIG. 6 is an enlarged sectional view of an essential part of FIG. 5, and FIG. FIG. 8 is an enlarged sectional view showing an essential part of another embodiment, and FIG. 8 is a sectional view showing an indoor unit of a conventional air conditioner. In the figure, (1) is the unit outer box, (2) is the heat exchanger, and (2a)
Is a plate fin, (2b) is a pipe, (3) is a blower fan, (3a) is an impeller, (4) is a pipe wake, (5) is a rectifying resistor, and (6) is a rectifying resistor. Behind the scenes. In the drawings, the same reference numerals indicate the same or corresponding parts.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hiroshi Kawaguchi, 3-18-1, Oga, Shizuoka, Shizuoka Prefecture, Shizuoka Plant, Mitsubishi Electric Corporation (72) Kazuyoshi Takahashi, 3-18-1, Oga, Shizuoka, Shizuoka Prefecture No. Mitsubishi Electric Corporation Shizuoka Factory

Claims (5)

[Scope of utility model registration request] 1. A heat exchanger (2) having a plate fin (2a) and a heat medium pipe (2b) penetrating therethrough and thermally coupled to the plate fin (2a) for exchanging heat between air and the heat medium. ) And a blower fan (3) provided on the downstream side of the air flowing through the heat exchanger (2) inside the unit outer box (1), the pipe (2b) wake region (4) ) Rectifying resistor to shrink
The air (5) is provided at a downstream position of the pipe (2b) near the impeller (3a) of the blower fan (3) corresponding to each of the pipes (2b). An indoor unit of a harmony machine. 2. The rectifying resistor (5) is a rectifying rod and is a pipe.
(2b) The room of the air conditioner according to claim 1, wherein two pipes are provided on each side of the pipe (2b) and substantially parallel to the pipe (2b). unit. 3. The rectifying resistor (5) is formed by deforming a part of the plate fin (2a), and two pipe fins (2b) are provided.
The indoor unit for an air conditioner according to claim 1, wherein the utility model registration is provided at both sides of the pipe (2b) and substantially parallel to the pipe (2b). 4. The indoor unit of an air conditioner according to claim 3, wherein the rectifying resistor (5) is a fin crushing portion formed by crushing a part of the plate fin (2a). 5. The room for an air conditioner according to claim 3, wherein the rectifying resistor (5) is a cut-and-raised portion formed by cutting and raising a part of the plate fin (2a). unit.