JP2002286244A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner capable of reducing the generation of noises due to a flow of air and interference with a fan. SOLUTION: A casing 12 consists of a base 10 and a front panel 11 and the air duct of a fan 17 is integrally formed, and a drain guide to receive drain generated at a heat exchanger 16 disposed on the suction side is also served by a suction nose 102 protruding and extending to the suction side of the fan 17. In the air conditioner formed as described above, the suction nose 102 is provided with a phase difference generating means 103 to generate a phase difference in a flow of air K flowing in the fan 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tangential fan, a cross flow fan or a cross flow fan used in an air conditioner.
an) and related to the shape of the drain guide (suction nose).

[0002]

2. Description of the Related Art FIG. 3 is a side view showing the structure of a conventional air conditioner. In this air conditioner, a front panel 11 is combined with a base 10 ′ to form a box-shaped housing (hereinafter, referred to as a casing) 12.
The front panel 11 has air inlets 13, 14, and 15 formed on the front and upper surfaces, respectively.

In the casing 12, a plate fin tube type heat exchanger 16 and a tangential fan 17 which is a cross flow fan are arranged. The plate fin tube type heat exchanger 16 has a configuration in which a plurality of plate fins are arranged in parallel, side plates are arranged on both sides thereof, and a tube through which a refrigerant flows is arranged between the side plates and the plurality of plate fins. No. The tangential fan 17 is disposed in an air passage in the casing 12.

[0004] Plate fin tube type heat exchanger 16
Is disposed on the air suction side when the tangential fan 17 rotates in the direction indicated by the arrow a in the figure so as to surround the tangential fan 17. The plate-fin tube type heat exchanger 16 includes a plurality of parts, that is, a first-stage part 161, a second-stage part 162, and a third-stage part 16.
It is bent to 3. On the other hand, an air outlet 20 of the front panel 11 is provided with a wind direction changing device 21 for changing the direction of blowing cool air and warm air.

Further, the tangential fan 17 described above is used.
Suction nose 1 that protrudes and extends on the air suction side
01 is provided integrally with the base 10 '. The suction nose 101 also serves as a drain guide for receiving drain (condensate) generated in the plate fin tube type heat exchanger 16.

When the tangential fan 17 is driven in the direction indicated by the arrow a, ambient air is sucked from the air suction port 13 on the front of the front panel 11 and the air suction ports 14 and 15 on the upper surface, respectively, and the plate fin tube is provided. First to third stage portions 161 to 16 of the heat exchanger 16
Sent to 3.

[0007] Air is exchanged between the first to third stage portions 161 to 163 of the plate fin tube type heat exchanger 16, and the obtained cool air or hot air K is driven by the tangential fan 17 as described above. From the suction side, the air flows across the impeller of the tangential fan 17 as indicated by the arrow in FIG.
It is blown from 0. At this time, the blowing direction of the cold air or the hot air K can be changed by the air direction changing device 21.

[0008]

As described above, the base 10 'is formed so as to also serve as a drain guide for treating drain (condensate) dripping from the plate fin tube type heat exchanger 16. I have. The shape of the suction nose 101 in the base 10 'is such that when the tangential fan 17 rotates in the direction of arrow a,
A gap formed between the base 10 ′ and the tangential fan 17 is formed so as to be substantially parallel to the outer periphery of the tangential fan 17.

The shape of the base 10 'forms a drain guide for treating the drain dripping from the bent plate-fin tube type heat exchanger 16, and at the same time, the suction of the tangential fan 17 When the nose 101 is also used, it is difficult to gradually increase the gap between the tangential fan 17 and the base 10 '(suction nose 101) from the air path side toward the suction side upstream.

Therefore, in the tangential fan 17 near the suction nose 101, the suction nose 101
Block the cold air or the hot air K sent from the third stage portion 163 of the plate fin tube type heat exchanger 16, so that the cold air or the hot air K flowing into the tangential fan 17 has the suction nose 101. , The flow rate of the cold air or the warm air K tends to be increased accordingly.

Then, in the tangential fan 17, a portion where the flow velocity of the cold or hot air K sent is high and a portion where the flow velocity is low are generated. The flow interferes with the blades of the tangential fan 17, and the NZ sound (the rotational speed of the tangential fan 17 is N [rpm], and the number of blades is Z
[Sheet], the generated frequency (f) is NZ / 60 [H
z]. ) Has been a problem.

As one of the methods for solving such a problem, in the past, for example, one in which the blades of the tangential fan 17 are arranged at irregular pitches has been devised and implemented. Where the pitch is wide, the fan performance decreases, and in the case where the pitch is narrow, the loss increases and the fan performance decreases when the flow velocity of the cool air or hot air K is the same. In this case, as shown in FIG. 4, the relationship between the sound pressure level (SPL) of the NZ sound and the generation frequency (f) of the NZ sound is such that the blades of the tangential fan 17 are arranged at irregular pitches. Therefore, there is a problem that the peak of the NZ sound is only dispersed, and the peak value of the NZ sound is not reduced.

The present invention has been made in view of the above problems, and has as its object to realize an air conditioner capable of reducing noise caused by interference between an air flow and a fan.

[0014]

In order to solve the above problems, the present invention employs the following means. Claim 1
In the air conditioner described in the above, the base and the front panel form a housing and integrally form the air path of the fan, and the drain guide that receives the drain generated by the heat exchanger disposed on the suction side of the air guide, In an air conditioner that is configured integrally with a suction nose that protrudes and extends to the suction side of the fan integrally with a base, the suction nose includes a phase difference generating unit that generates a phase difference in the flow of air flowing into the fan. It is characterized by having.

According to the air conditioner described above, the phase difference generating means of the suction nose generates a phase difference in the air flowing into the fan, so that the flow velocity of the air flowing into the fan is partially increased. The noise generated by interference between the air flow and the fan is reduced.

Further, according to a second aspect of the present invention, in the air conditioner according to the first aspect, the phase difference generating means includes:
It is characterized by having an inclined portion inclined with respect to the flow direction of the air flowing into the fan. According to this air conditioner, the air that flows into the fan is divided into a mountain side and a valley side of the inclined portion and passes therethrough, thereby easily generating a phase difference.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view showing a main part of an air conditioner according to an embodiment of the present invention. In FIG. 1, parts corresponding to those in FIG. 3 are denoted by the same reference numerals. The basic configuration of the air conditioner according to the present embodiment (that is, the shape of suction nose 102 of base 10 is different from that of base 1 in the air conditioner of FIG. 3).
0 ', except for the suction nose 101)
Since it is the same as that shown based on the air conditioner of FIG. 3 described above, the description is omitted here.

In practice, the suction nose 102 of the base 10 shown in FIG. 1 protrudes and extends in the direction opposite to the rotational direction of the tangential fan 17 (indicated by an arrow a in FIG. 3). A phase difference generating unit 103 is provided as phase difference generating means for generating a phase difference in the flow of air flowing into the sensual fan 17. More specifically, the phase difference generating unit 103 includes a plurality of inclined portions 103A that are inclined in the width direction of the suction nose 102 with respect to the direction in which the air (cool air or hot air K) flowing into the tangential fan 17 flows. Be formed.

Therefore, in the tangential fan 17 near the suction nose 102, the suction nose 102
Does not block the air (cold air or hot air K) sent from the third stage portion 163 of the plate fin tube type heat exchanger 16, and these cold air or hot air K Inclined part 1 in 103
By passing through the mountain side and the valley side of 03A,
Since a phase difference can be easily generated, interference with the blade can be reduced, and as a result, the NZ sound can be made inconspicuous.

In this embodiment, since the blades of the tangential fan 17 are arranged at equal pitches, for example, as shown in FIG. 2, the sound pressure level (SPL) of the NZ sound is obtained. The peak of the NZ sound in the relationship between the NZ sound and the generation frequency (f) of the NZ sound can be reduced from the peak value of the related art (FIG. 4), and the NZ sound can be reduced.

As described above, in the tangential fan 17 near the suction nose 102, the air sent from the third stage portion 163 of the plate fin tube type heat exchanger 16 and the blade of the tangential fan 17 Can reduce the NZ sound caused by this without interference. The suction nose 102 also has a function of a drain pan for treating drain (condensate) dripping from the third stage portion 163 of the heat exchanger 16.

In the above-described embodiment,
As the phase difference generating means, a plurality of inclined portions 103A are formed in the width direction of the suction nose 102 in the width direction of the tangential fan 17 in the width direction of the tangential fan 17. Although the case where the phase difference generating unit 103 is applied has been described, the present invention is not limited to this, and the point is that as long as it generates a phase difference in the flow of air flowing into the fan, the phase difference generating means In addition, various other types can be widely applied.

In the above-described embodiment,
Although the case where the tangential fan 17 is applied as a fan of the air conditioner has been described, the present invention is not limited to this, and for example, a tangential fan, a cross flow fan, a transverse fan, or the like. )
Etc. can be widely applied.

[0024]

As described above, according to the present invention, the phase difference generating means is provided in the suction nose of the air conditioner, so that the phase difference generating means generates a phase difference in the air flowing into the fan. Since it is possible to prevent the flow velocity of the air flowing into the fan from partially increasing, it is possible to prevent the air flow from interfering with the fan beforehand, and thus the air flow can be prevented. An air conditioner that can reduce noise caused by interference with a fan can be realized.

Further, according to this air conditioner, the phase difference generating means has the inclined portion inclined with respect to the flow direction of the air flowing into the fan. The phase difference can be easily generated by passing through the valley side and the valley side.

[Brief description of the drawings]

FIG. 1 is an enlarged perspective view of a main part of an air conditioner according to the present embodiment.

FIG. 2 is a graph showing a relationship between a sound pressure level of a NZ sound and a generation frequency of the NZ sound in the present invention.

FIG. 3 is a longitudinal sectional view of a conventional air conditioner.

FIG. 4 is a graph showing a relationship between a sound pressure level of a conventional NZ sound and a generation frequency of the NZ sound.

[Explanation of symbols]

 K Cool air or hot air (air) 10 Base 10 'Base 101 Suction nose 102 Suction nose 103 Phase difference generating section (phase difference generating means) 103A Inclined section 11 Front panel 12 Housing (casing) 13, 14, 15 Air suction port Reference Signs List 16 plate fin tube type heat exchanger 161 first stage portion 162 second stage portion 163 third stage portion 17 tangential fan (fan) 20 air outlet 21 wind direction changing device

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) F04D 29/44 F04D 29/44 P 3L051 X 5D061 29/66 29/66 NG10K 11/16 G10K 11/16 B (72) Inventor Satoshi Watanabe 1 Nagoya Laboratory, Iwazuka-cho, Nakamura-ku, Nagoya City, Aichi Prefecture Inside the Nagoya Research Laboratory, Mitsubishi Heavy Industries, Ltd. (72) Inventor Masato Shimo 3-18-28 Marunouchi, Naka-ku, Nagoya-shi, Aichi F-Term in Nippon Tecseed Co., Ltd. 3L049 BA00 BB08 BC01 BD02 3L050 AA03 BA01 BA10 BD05 BE03 BF04 3L051 BG07 BH04 5D061 EE24

Claims (2)

[Claims] 1. A drain guide, which forms a housing with a base and a front panel and integrally forms an air passage of a fan, and receives drain generated by a heat exchanger disposed on a suction side thereof, is integrated with the base. In the air conditioner, the suction nose is provided with a phase difference generating means for generating a phase difference in the flow of the air flowing into the fan. An air conditioner characterized by the following. 2. The air conditioner according to claim 1, wherein the phase difference generating means has an inclined portion inclined with respect to a flow direction of the air flowing into the fan.