JP2000292086A - Finned tube type heat exchanger and air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a finned tube type heat exchanger which can reduce noise and to provide an air conditioner which is equipped with this heat exchanger and of which the noise is reduced thereby. SOLUTION: In a finned tube type heat exchanger constituted by piercing a plurality of juxtaposed fins 1 through by a heat transfer tube 2, a serration 3 for suppressing a turbulent flow vortex is formed in the end edge on the lee of the fin 1. Besides, the peak or the root of the serration is positioned at a portion corresponding to the position of disposition of the heat transfer tube 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fin-tube heat exchanger and an air conditioner provided with such a heat exchanger.

[0002]

2. Description of the Related Art Hitherto, noise reduction of fans and arrangement of peripheral devices have been considered as measures to reduce noise in air conditioners. However, for the heat exchangers constituting the air conditioner, measures for improving the performance mainly by improving the fin efficiency are actually implemented. With the improvement of the performance due to the improvement of the fin efficiency, turbulent vortices are easily generated in the airflow passing through the heat transfer tubes and the fins.

[0003]

FIG. 6 schematically shows a state in which turbulent vortices are generated. In this heat exchanger, a heat transfer tube 2 is passed through a plurality of fins 1.1 arranged in parallel. The turbulent vortex R is a fin-tube type heat exchanger comprising:
On the leeward side of When the air flow that is not rectified is sucked into the fan, it causes noise.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a fin-tube heat exchanger capable of suppressing noise more than before. Another object of the present invention is to provide an air conditioner including such a heat exchanger and thus suppressing noise.

[0005]

According to a first aspect of the present invention, there is provided a fin-tube heat exchanger comprising a plurality of fins arranged in parallel with a heat transfer tube. A serration 3 for suppressing turbulent vortices is formed at the leeward edge of the fin 1.

In the fin-tube heat exchanger according to the first aspect, the serrations 3 are provided so that the fins 1
The generation of turbulent vortices on the leeward side of the vehicle is suppressed, thereby suppressing the generation of noise. The serration 3 in the above description refers to a structure in which the edge of the fin 1 is cut out in a semicircular shape, a triangular shape, or the like, and may be provided over the entire leeward edge of the fin 1 or a portion where the wind speed is high. May be provided only locally.

According to a second aspect of the present invention, the fin or tube heat exchanger has a hill or valley of a serration located at a position corresponding to a position where the heat transfer tube is disposed at a leeward edge of the fin. It is characterized by having.

In the fin-tube heat exchanger according to the second aspect, since the peaks or valleys of the serrations 3 are located at portions corresponding to the positions where the heat transfer tubes 2 are disposed, noise can be more effectively suppressed. Becomes possible.

The fin-tube heat exchanger according to claim 3 is characterized in that serrations 3 having the same shape as the leeward side edge are provided at the leeward side edge of the fin 1.

In the fin-tube type heat exchanger according to the third aspect, since both sides of the fin 1 have the same shape, no consideration is required for the direction of the fin 1 when assembling the heat exchanger, which is required for the assembling operation. This suppresses an increase in the number of steps, thereby facilitating the production and suppressing the production cost.

[0011] The air conditioner of claim 4 is the above-mentioned claim 1.
4. A fin-tube heat exchanger according to claim 3.
Is provided on at least one of the indoor side and the outdoor side.

In the air conditioner of the fourth aspect, the airflow sucked into the fan of the indoor unit or the outdoor unit is in a rectified state, so that generation of noise by the fan can be suppressed.

The air conditioner according to claim 5 is characterized in that the fin-tube type heat exchanger 10 is provided in an indoor unit, and the serrations 3 are provided in a portion close to the cross flow fan 11.

In the air conditioner of the fifth aspect, since the serrations 3 are provided in a portion close to the cross flow fan 11, that is, in a portion where the wind speed is high, generation of noise in the cross flow fan 11 is effectively suppressed. it can.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, specific embodiments of a fin-tube heat exchanger and an air conditioner according to the present invention will be described in detail with reference to the drawings.

FIG. 1 schematically shows a fin-tube heat exchanger. This heat exchanger has a structure in which a heat transfer tube 2 is passed through a large number of fins 1.1 arranged in parallel. is there. A serration 3 is formed on the leeward edge of each fin 1. The serration 3 refers to a structure in which the edge of the fin 1 is cut out in a semicircular shape (FIG. 1A), a triangular shape (FIG. 1B), or the like. It is 3 mm to 7 mm and has a depth of about 2 mm to 4 mm. Then, as shown in FIGS. 1A and 1B, the valleys of the serrations 3 are arranged at the leeward position corresponding to the arrangement position of the heat transfer tube 2 on the leeward side. In this way, turbulent vortices caused by the presence of the heat transfer tubes 2 can be effectively suppressed. This serration 3 is shown in FIG.
As shown in FIG. 1 (c), the fin 1 may be provided continuously on the leeward edge of the fin 1, and its shape is not limited to a semicircular shape.
Other shapes such as a triangular shape (sawtooth shape) and a rectangular shape as shown in FIG. The fins 1 have the same shape, and the serrations 3 extend in the direction in which the heat transfer tubes 2 extend, that is, in the direction perpendicular to the plane of FIG.
The fins 1 are formed so as to have the same shape and the same position at the leeward edge of all the fins 1.

If the serrations 3 are provided on the leeward edge of the fins 1 of the heat exchanger 10 as described above, the generation of turbulent vortices due to the presence of the heat transfer tubes 3 on the leeward side of the fins 1 is suppressed. This has the advantage that the generation of noise can be suppressed. In particular, when the valleys (or peaks) of the serrations 3 are arranged at the leeward position corresponding to the arrangement positions of the heat transfer tubes 2 on the leeward side, noise can be more effectively suppressed.

FIGS. 2 and 3 show a modification of the arrangement of the serrations 3 in the fin 1. FIG. FIG.
At the leeward edge of the fin 1
Is shown only in a portion where the wind speed is high, but according to such a structure, with a small serration 3,
It is possible to effectively suppress turbulent vortices and reduce noise. FIG. 3 shows an example in which serrations 3 having exactly the same shape as the leeward side are also formed on the leeward side of the fin 1, and the shape of the fin 1 is exactly the same on both the leeward side and the leeward side. I have. By adopting such a structure, the turbulent vortex can be suppressed to reduce noise, and in addition, the fins 1 can be used without distinction between the front and back, upper and lower sides. Occasionally, there is no need to consider the direction of the fins 1, and there is an advantage that an increase in the manufacturing cost can be prevented.

FIG. 4 shows an example in which the fin-tube heat exchanger 10 having the above structure is applied to an outdoor unit of an air conditioner. According to this structure, it is possible to suppress the turbulent vortex generated in the heat exchanger 10 from being sucked into the outdoor fan 12 without being rectified, so that it is possible to suppress the generation of noise due to the turbulent vortex.

FIG. 5 shows an example in which the fin-tube heat exchanger 10 having the above structure is applied to an indoor unit of an air conditioner. According to this structure, the turbulent vortex generated in the heat exchanger 10 is not rectified and the cross flow fan 11
The turbulent vortex can suppress the generation of noise caused by the turbulent vortex. in this case,
As shown in the figure, the serrations 3 may be provided over the entire leeward edge of the fin 1, or may be locally provided only in a portion close to the cross flow fan 11, that is, in a portion where the wind speed of the cross flow fan 11 is high. It may be provided. When the serrations 3 are provided locally in this manner, noise can be effectively suppressed with a small number of serrations 3.

[0021]

According to the fin-tube heat exchanger of the first aspect, the serration is provided to suppress the generation of turbulent vortices on the leeward side of the fin, thereby suppressing the generation of noise.

In the fin-tube heat exchanger according to the second aspect, since the peak or the valley of the serration is located at a portion corresponding to the position of the heat transfer tube, noise can be more effectively suppressed. Becomes

In the fin-tube heat exchanger according to the third aspect, since both sides of the fin are formed in the same shape, it is not necessary to consider the direction of the fin at the time of assembling the heat exchanger. The increase is suppressed, and therefore, the production becomes easy, and the production cost can be suppressed.

In the air conditioner according to the fourth aspect, since the airflow sucked into the fan is in a rectified state, the generation of noise by the fan of the indoor unit or the outdoor unit can be suppressed.

In the air conditioner according to the fifth aspect, since the serration is provided in a portion close to the cross flow fan, that is, in a portion where the wind speed is high, generation of noise in the cross flow fan can be effectively suppressed.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a heat exchanger according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a modified example of the heat exchanger.

FIG. 3 is an explanatory diagram of another modified example of the heat exchanger.

FIG. 4 is an explanatory diagram of an example in which the heat exchanger is applied to an outdoor unit of an air conditioner.

FIG. 5 is an explanatory diagram of an example in which the heat exchanger is applied to an indoor unit of an air conditioner.

FIG. 6 is an explanatory diagram of a conventional heat exchanger.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fin 2 Heat transfer tube 3 Serration 10 Heat exchanger 11 Cross flow fan

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Eiji Tanaka 1000-2 Oya, Okamotocho, Kusatsu-shi, Shiga 2 Daiga Industries Co., Ltd. Shiga Works

Claims (5)

[Claims] 1. A fin-tube heat exchanger comprising a plurality of fins (1) arranged in parallel and a heat transfer tube (2) penetrating the fins (1). A fin-tube heat exchanger characterized by forming serrations (3) for suppressing. 2. A hill or valley of a serration (3) is located at a portion corresponding to an arrangement position of the heat transfer tube (2) at a leeward edge of the fin (1). The fin-tube heat exchanger of claim 1. 3. The fin according to claim 1, wherein a serration (3) having the same shape as the leeward edge is provided at a windward edge of the fin (1). Tube type heat exchanger. 4. An air conditioner comprising the fin-tube type heat exchanger (10) according to any one of claims 1 to 3 at least on the indoor side or the outdoor side. Machine. 5. The fin-tube heat exchanger (1)
The air conditioner according to claim 4, wherein (0) is provided in the indoor unit, and the serration (3) is provided in a portion close to the cross flow fan (11).