JP2000234766A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a low noise outdoor unit by reducing noise being generated from a fan guard section. SOLUTION: Air inlet and outlet are made in the opposite faces of the housing 1 of an outdoor unit. A heat exchanger 2 is disposed to cover the air inlet in the housing 1. A clamp 3 is fixed to the central part of the housing 1 and a motor 4 is secured to the clamp 3. A fan 5 is secured to the rotary shaft of the motor 4 while facing the air outlet in the housing 1. A fan guard 7A is secured to the housing 1 while covering the air outlet. Lower end part of the fan guard 7A is spaced apart farther from the fan 5 as compared with the upper end.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner suitable for reducing the noise of an outdoor unit.

[0002]

2. Description of the Related Art Separate type air conditioners, which are composed of an outdoor unit and an indoor unit, are installed in various places.

[0003] The noise generated by the outdoor unit includes noise generated by a compressor, blowing noise generated by a blower, and wind noise generated by a fan guard. In particular, since the blowing noise and the wind noise are directly emitted to the outside, reducing the blowing noise and the wind noise has been one of the issues in reducing the noise of the outdoor unit.

For example, an outdoor unit of an air conditioner is shown in FIG.
1. As shown in FIG. 22, heat exchanger 2, clamp 3, motor 4 supported by clamp 3, and fixed to motor 4 in box 1 from the upstream side of the air flowing in outdoor unit 1. Fan 5, bellmouth 6 covering the outer periphery of this fan
And a fan guard 7 that covers the outlet.

When the motor 4 is operated and the fan 5 is rotated in such a configuration, the air sucked into the box 1 through the heat exchanger 2 is discharged to the atmosphere through the fan guard 7. At this time, the flow velocity of the air discharged from the fan 5 and passing through the fan guard 7 has a distribution as shown in FIG. Then, when a portion having a large flow velocity passes through the fan guard 7, a loud wind noise is generated.

In order to solve such a problem, for example, a low-noise fan guard disclosed in Japanese Patent Application Laid-Open No. 3-206392 has been proposed. This low-noise fan guard reduces the size and density of the components corresponding to the vicinity of the maximum flow velocity of the air flow discharged from the fan guard blower, thereby suppressing the generation of noise. .

[0007]

However, as shown in FIG. 24, the speed of the air flow 8 blown out of the fan 5 changes rapidly when the air flow 8 is discharged from the fan 5, so that the air flow 8 downstream of the fan 5 A turbulent vortex 9 is generated in the portion. This turbulent vortex 9
When the vehicle collides with the fan guard 7, a loud noise (guard noise or guard sound) is generated therefrom.

The magnitude of the guard noise is the difference between the noise when the fan guard 7 is attached to the outdoor unit and the noise when the fan guard 7 is removed.
Guard noise = total noise-fan noise.

In view of the above circumstances, it is an object of the present invention to provide an air conditioner in which noise generated in a fan guard portion is reduced and the overall outdoor unit is reduced in noise.

[0010]

In order to achieve the above object, the invention according to claim 1 of the present application covers the outer periphery of a compressor, a heat exchanger, a blower and a fan of the blower in a box. In an air conditioner including a bell mouth and an outdoor unit including a fan guard that covers an outlet of the blower outside the housing, a base where the fan guard is attached to the box, and a position adjustment to the base. It is constituted by a guard portion supported so as to be able to adjust the distance between the rear edge portion of the impeller and the guard portion.

The invention described in claim 2 is the first invention.
In the invention described in (1), the guard mounting surface of the base is formed so as to be inclined with respect to the fan guard mounting surface of the box.

Further, the invention described in claim 3 is the first invention.
In the invention described in (1), the guard portion is coupled to the base movably in a direction perpendicular to a fan guard mounting surface of the box body.

The invention described in claim 4 is the first invention.
In the invention described in (1), the base portion and the guard portion are connected by a bellows.

According to a fifth aspect of the present invention, in the first aspect of the present invention, the guard portion includes a plurality of annular members arranged concentrically and a plurality of annular members arranged radially and adjacent to each other. It is formed of a plurality of linear members that swingably connect between them.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a first embodiment of the present invention.
1 is a perspective view of an outdoor unit of an air conditioner, and FIG. 2 is a side sectional view of FIG.

In FIG. 1, reference numeral 1 denotes a box body of an outdoor unit having an air inlet and an air outlet formed on opposing surfaces. Reference numeral 2 denotes a heat exchanger, which is disposed so as to cover the suction port of the box 1. Reference numeral 3 denotes a clamp which is fixed to the center of the box 1. A motor 4 is fixed to the clamp 3. A fan 5 is fixed to the rotation shaft of the motor 4 so as to face the outlet of the box 1. 6 is bellmouth, fan 5
Is fixed to the outlet of the box 1 so as to cover the outer circumference of the box 1.
7A is a fan guard fixed to the box 1 so as to cover the outlet of the box 1.

As shown in FIG. 2, the distance between the rear edge of the fan 5 and the upper end of the fan guard 7A is the same as that of the conventional fan guard 7A, and the rear edge of the fan 5 and the lower end of the fan guard 7A. Is greater than distance S1 by distance S2
Is set to

With such a configuration, the velocity of the airflow 8 blown out from the fan 5 changes rapidly when the airflow 8 is discharged from the fan 5, and a turbulent vortex is generated on the outer peripheral portion downstream of the fan 5. I do. Then, the turbulent vortex colliding with the upper part of the fan guard 7 generates a loud noise therefrom.

However, the turbulent vortex colliding with the lower part of the fan guard 7 is attenuated and reduced or disappears from the trailing edge of the fan 5 to the lower part of the fan guard 7A. Therefore, the noise generated below the fan guard 7 can be reduced, and the noise of the outdoor unit as a whole can be suppressed and the noise can be reduced.

FIGS. 3 to 5 show a second embodiment of the present invention. FIG. 3 is a side sectional view of an outdoor unit, and FIG.
Is an enlarged view of a portion A in FIG. 3, and FIG. 5 is a characteristic diagram showing a relationship between a distance between a rear edge of the fan and the fan guard and noise.

In FIG. 2, the same components as those in FIGS. 1 and 2 are denoted by the same reference numerals. Reference numeral 7B denotes a fan guard, which is fixed to a fan guard frame 11 having an uneven outer peripheral surface. Reference numeral 12 denotes a fixing bracket, and the fan guard frame 11
Are arranged at predetermined intervals so as to surround the fan guard frame 11, the tips of which are fitted into concave and convex recesses on the outer peripheral surface of the fan guard frame 11, and are fixed to the box body 1 with screws 13 to fix the fan guard frame 11. I do.

With such a configuration, the screw 13 is loosened and the fixing bracket 12 is retracted from the fan guard frame 11 so that, for example, as shown in FIG. 2, the distance between the rear edge of the fan 5 and the fan guard 7B is reduced. The distance S1 is set to be greater than the distance S1 from the distance S1, and the fixing bracket 12 is attached to the fan guard frame 11.
And the screw 13 is tightened to fix the fan guard frame 11. In this way, the fan guard 7B
Can be adjusted.

By changing the distance S between the rear edge of the fan 5 and the fan guard 7B, the guard sound can be reduced as shown in FIG. That is, when the distance S between the rear edge of the fan 5 and the fan guard 7B is 20 mm, the guard sound reduction is about 1, 2 dB, whereas when the distance S is 40 mm, the guard sound reduction is about 3, 1 dB, and the fan guard sound can be reduced by about 2 dB.

FIG. 6 shows a third embodiment of the present invention, and is a partial side sectional view of an outdoor unit.

In FIG. 1, reference numeral 1 denotes a box body of an outdoor unit having an air inlet and an air outlet formed on opposing surfaces. 7C
Is a fan guard. Reference numeral 15 denotes a flange, which has elongated holes 16 formed on two opposing sides, and surrounds the outlet of the box 1.
It is fixed to. Reference numeral 17 denotes a shaft which is slidably supported by the elongated hole 16.

Reference numeral 18 denotes a link, one end of which is the shaft 1
7 rotatably supported. Reference numeral 19 denotes a center shaft, which is composed of a bolt and a nut, and penetrates the center of each link 18 so as to be rotatable and movable in the axial direction.

Reference numeral 20 denotes a flange, which has two long holes on two opposite sides.
1 is formed and fixed to the fan guard 7C. 2
Reference numeral 2 denotes a shaft, which is rotatably fitted to the other end of the link 18 and is slidably supported by the elongated hole 21. Reference numeral 23 denotes an elastic wind guide member, which is disposed between each flange 15 and the flange 20.

With such a configuration, the center shaft 19 is loosened and the fan guard 7C is pushed and pulled to set the distance between the rear end of the fan (not shown) and the fan guard 7C, and tighten the center shaft 19. To fix the position of the fan guard 7C.

FIG. 7 shows a fourth embodiment of the present invention, and is a partial side sectional view of an outdoor unit.

In FIG. 1, reference numeral 1 denotes a box body of an outdoor unit, and an air inlet and an air outlet are formed on opposing surfaces. 7D
Is a fan guard. A flange 25 is fixed to the box 1 so as to surround the outlet of the box 1. A bellows 26 is fixed between the fan guard 7D and the flange 25.
Reference numeral 27 denotes a bolt which passes through the fan guard 7D, the bellows 26 and the flange 25 and is screwed into a screw hole formed in the box 1.

With such a configuration, the position of the fan guard 7D with respect to the rear end of the fan (not shown) can be adjusted by changing the length of the bolt 27.

FIGS. 8 to 10 show a fifth embodiment of the present invention. FIG. 8 is an exploded view of a fan guard mounting portion, and FIG. 9 shows a shape of a fan guard frame in FIG. , (A) is a front view, (b) to (e) are side views,
FIG. 10 is an enlarged view of a portion A in FIG.

In FIG. 1, reference numeral 1 denotes a box of an outdoor unit, and an air inlet and an air outlet 1A are formed on opposing surfaces.
Reference numeral 30 denotes a fan guard frame formed in a rectangular base shape, and is fixed to the box body 1 so that one end covers the outlet 1A. A fan guard 7E is fixed to the other end of the fan guard frame 30.

The shape of the fan guard frame 30 is shown in FIG.
As shown in (b), a shape that expands linearly from the mounting portion to the box 1 toward the mounting portion of the fan guard 7E, and as shown in FIG. Further, a fan guard mounting portion that expands in a curved shape, a shape that expands in a stepwise manner as shown in FIG. 3D, or a fan guard mounting portion that expands in a stepwise manner as shown in FIG. A shape expanded in a curved shape or the like can be appropriately selected.

The fan guard frame 30 is shown in FIG.
(A) a combination of wires,
As shown in FIG. 2B, a material obtained by processing a mesh (net) or a material obtained by processing a punching metal can also be used.

With such a configuration, the fan guard frame 30 is attached to the box 1 from the fan guard 7
By preparing a plurality of types having different dimensions up to the mounting portion of E, the distance from the rear end of the fan (not shown) to the fan guard 7E can be adjusted.

Further, as shown in FIG. 10, by using the fan guard frame 30 having a hole on the side surface, the air discharged from the fan can be diffused to the outside from the hole, so that the air passes through the fan guard 7E. The speed of the wind can be reduced, and the guard sound generated in the fan guard 7E can be further reduced.

FIGS. 11 and 12 show a sixth embodiment of the present invention. FIG. 11 is an exploded view of a fan guard mounting portion, and FIG. 12 shows the shape of a fan guard frame in FIG. (A) is a front view, (b) is a side view.

In FIG. 1, reference numeral 1 denotes a box of an outdoor unit, and an air inlet and an outlet 1A are formed on opposing surfaces.
Reference numeral 31 denotes a fan guard frame formed in a truncated cone shape, and is fixed to the box 1 so that one end covers the outlet 1A. 7F is a fan guard, which is fixed to the other end of the fan guard frame 31.

The fan guard frame 31 can have the same shape and configuration as those shown in FIGS. 9 and 10.

With such a configuration, the same effect as that of the fifth embodiment can be obtained.

FIGS. 13 and 14 show a seventh embodiment of the present invention. FIGS. 13A and 13B show an outdoor unit to which a fan guard is attached, wherein FIG. 13A is a front view, and FIG. FIG. 14 is an enlarged view of the fan guard in FIG.

In FIG. 1, reference numeral 1 denotes a box body of an outdoor unit having an air inlet and an air outlet formed on opposing surfaces. 7G
Is a fan guard, which is fixed to the solid 1 at the flange 35, and is a first-stage guard 7G formed in the shape of a truncated cone, respectively.
The first and second guards 7G2 and the third guard 7G3
It is composed of

The remarkable guards 7G1, 7G2, 7G
Numeral 3 is obtained by brazing or welding intersections of a plurality of concentrically formed annular wires and a plurality of radially arranged linear wires.

With such a configuration, the guards 7G2, 7G3
Can be adjusted from the guard 7G1, so that the distance from the rear end of the fan (not shown) to the fan guards 7G2 and 7G3 can be adjusted.

FIGS. 15 and 16 show a seventh embodiment of the present invention. FIGS. 15A and 15B show an outdoor unit with a fan guard attached, wherein FIG. 15A is a front view, and FIG. FIG. 16 and FIG. 16 are partial side sectional views showing a state in which the fan guard is pulled out.

In FIG. 1, reference numeral 1 denotes a box body of an outdoor unit, which has an air inlet and an air outlet formed on opposing surfaces. 7H
Is a fan guard, which is composed of a plurality of concentrically arranged annular wires and a plurality of linear wires arranged in a radial direction and rotatably and slidably connecting adjacent annular wires.

Then, for example, as shown in FIG.
By drawing out a portion corresponding to a portion where the speed of the wind blown from a fan (not shown) is large, the guard sound can be reduced, and the noise of the entire outdoor unit can be reduced.

FIG. 17 shows an eighth embodiment of the present invention and is an exploded view showing a mounting structure of a fan guard.

In FIG. 1, reference numeral 1 denotes a box body of an outdoor unit, in which a plurality of screw holes 1B are formed around an outlet 1A. 3
Reference numeral 0 denotes a fan guard frame, which is formed with a plurality of tabs 30A having through holes corresponding to the screw holes 1B and a plurality of flanges 30B having rectangular through holes. 4
A screw 0 penetrates the hole of the tab 30A and is screwed into the screw hole 1B of the box 1 to fix the fan guard frame 30 to the box 1.

Reference numeral 7E denotes a fan guard,
A plurality of claws 41 corresponding to the hole B are formed, and the fan guard 7 of the fan guard frame 30 is formed by inserting the claws 41 into the hole.
E is attached.

Note that a screw hole may be formed in the fan guard frame 30, and the fan guard 7E may be fixed with a screw.

With such a configuration, the attachment / detachment of the fan guard 7E can be facilitated.

FIGS. 18 to 20 show a ninth embodiment of the present invention. FIG. 18 is an exploded view showing a mounting structure of a fan guard, and FIG. 19 is an enlarged view of a portion A in FIG. 20 is an enlarged view of a portion B in FIG.

Referring to FIG. 1, reference numeral 1 denotes a box of an outdoor unit, in which a plurality of elongated holes 1C and screw holes 1B are formed around an outlet 1A. 7I is a fan guard, which is composed of an annular or spiral wire 42 and a radially arranged wire 43, and a part of the radially arranged wire 43 is bent into an L-shape, and one of them is bent. Is bent in a circle. 40
Is a screw, which is screwed into the screw hole 1b of the box 1.

With such a configuration, the L-shaped bent portion of the wire 43 is inserted into the elongated hole 1C of the box 1, and the fan guard 7I is inserted into the L-shaped end of the wire 43 to form the box 1 Rotate to hide inside. Then, screw 40 is connected to wire 4
3 is screwed into the screw hole 1B of the box body 1 by passing through the circle at the tip of the box body 3 and tightened.

With such a configuration, the attachment / detachment of the fan guard 7E can be facilitated.

[0058]

As described above, according to the present invention,
In the air conditioner, the fan guard is composed of a base attached to the box, and a guard supported at a position adjustable to the base, and a distance between a rear edge of the impeller and the guard can be adjusted. Therefore, the distance between the rear edge of the blow-out side of the fan and the fan guard can be changed, the guard sound can be reduced, and the noise of the entire outdoor unit can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of an outdoor unit of an air conditioner according to the present invention.

FIG. 2 is a side sectional view of FIG.

FIG. 3 is a side sectional view of the outdoor unit according to the present invention.

FIG. 4 is an enlarged view of a portion A in FIG. 3;

FIG. 5 is a characteristic diagram showing the relationship between the distance between the rear edge of the fan and the fan guard and noise.

FIG. 6 is a side view partially sectional view of the outdoor unit according to the present invention.

FIG. 7 is a side view partially sectional view of an outdoor unit according to the present invention.

FIG. 8 is an exploded view of a fan guard mounting portion.

9 shows the shape of the fan guard frame in FIG. 8,
(A) is a front view, (b) through (e) are side views.

FIG. 10 is an enlarged view of a portion A in FIG. 9;

FIG. 11 is an exploded view of a fan guard mounting portion.

12 shows the shape of the fan guard frame in FIG. 11, (a) is a front view, and (b) is a side view.

FIG. 13 shows an outdoor unit equipped with a fan guard,
(A) is a front view, (b) is a side view.

FIG. 14 is an enlarged view of the fan guard in FIG. 13;

FIG. 15 shows an outdoor unit equipped with a fan guard,
(A) is a front view, (b) is a side view.

FIG. 16 is a partial side sectional view showing a state in which the fan guard is pulled out.

FIG. 17 is an exploded view showing a mounting structure of the fan guard.

FIG. 18 is an exploded view showing a mounting structure of the fan guard.

FIG. 19 is an enlarged view of a portion A in FIG. 18;

FIG. 20 is an enlarged view of a portion B in FIG. 18;

FIG. 21 is a perspective view of an outdoor unit of a conventional air conditioner.

FIG. 22 is a side sectional view of FIG. 21;

FIG. 23 is a side view showing the velocity distribution of wind blown from the outdoor unit.

FIG. 24 is an enlarged view showing one cause of noise generation in a conventional outdoor unit.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Outdoor unit box, 1A ... Outlet, 2 ... Heat exchanger, 3 ...
Clamp, 4 motor, 5 fan, 6 bellmouth,
7A, 7B, 7C, 7D, 7E, 7F, 7G, 7H, 7
I: Fan guard, 7G1, 7G2, 7G3: Guard,
11, 30, 31 ... fan guard frame, 12 ... fixing bracket,
13 ... screw, 15 ... flange, 17 ... shaft, 18 ... link, 19 ... center shaft, 20 ... flange, 22 ... shaft, 23 ...
Wind guide member, 25 ... flange, 26 ... bellows, 27 ... bolt, 35 ... flange,

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Tetsushi Kishitani 390 Muramatsu, Shimizu-shi, Shizuoka Prefecture Inside Air Conditioning Systems Division, Hitachi, Ltd. (72) Keiji Tanaka 390 Muramatsu, Shimizu-shi, Shizuoka Prefecture Air Conditioning Systems Business, Hitachi, Ltd. In-house (72) Inventor Hideki Okuzono 390 Muramatsu, Shimizu-shi, Shizuoka Pref.Hitachi, Ltd.Air Conditioning Systems Division (72) Inventor Takeshi Moriya 502, Kandatecho, Tsuchiura-City, Ibaraki Pref.Hitachi, Ltd. Inventor Shinichi Shimoide 502 Kandate-cho, Tsuchiura-city, Ibaraki Pref., Hitachi, Ltd. Machinery Research Laboratory Co., Ltd. (72) Inventor Shigehisa Funabashi 502-Kindachi-cho, Tsuchiura-City, Ibaraki Pref. 3L054 BA02 BA04 BB03

Claims (5)

[Claims] An outdoor having a compressor, a heat exchanger, a blower and a bell mouth for covering an outer periphery of a fan of the blower inside a box, and a fan guard for covering an outlet of the blower outside the box. In the air conditioner provided with the air conditioner, the fan guard comprises a base attached to the box, and a guard portion supported at a position adjustable to the base, and a distance between a rear edge portion of the impeller and the guard portion. An air conditioner characterized by the ability to adjust. 2. The air conditioner according to claim 1, wherein the guard mounting surface of the base is formed to be inclined with respect to the fan guard mounting surface of the box. 3. The air conditioner according to claim 1, wherein the guard portion is connected to the base so as to be movable in a direction perpendicular to a fan guard mounting surface of the box. 4. The air conditioner according to claim 1, wherein said base and said guard are connected by bellows. 5. The guard portion is formed by a plurality of annular members arranged concentrically and a plurality of linear members radially arranged and swingably connected between adjacent annular members. The air conditioner according to claim 1, wherein: