JPH11201497A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate whistling through a simple structure by lowering the velocity of bypass air flow leaking through the gap between a switch box and a cover. SOLUTION: A substantially annular heat exchanger 4, a tan 5 disposed in the center of the heat exchanger 4 while directing the suction side downward and the flowing out side sideways, and a bell mouth 6 disposed on the suction side of the fan 5 are encased in the casing of an air conditioner. A switch box 11 having a cover 12 closing the lower opening is fixed to the bell mouth 6. A member 15 blocks bypass air flow (w) leaking from the joint face between the switch box 11 and the cover 12 and flowing toward the suction hole 13 of the bell mouth 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceiling-mounted air conditioner, and more particularly, to noise reduction by blocking airflow leaking from a gap between a switch box attached to a bell mouth and a lid cover. The present invention relates to an air conditioner designed to be lowered.

[0002]

2. Description of the Related Art Generally, an air conditioner of a ceiling-mounted type has an air conditioner body 1 disposed above an opening 7 formed in a ceiling C as shown in FIG. 1 is provided with a decorative panel 2 covering the opening 7. A casing 3 of the air conditioner body 1 has a substantially annular heat exchanger 4 and a center of the heat exchanger 4. A blower 5 having a suction side facing downward and a blowout side facing the heat exchanger 4 and a bell mouth 6 disposed on the suction side of the blower 5 are provided. Reference numeral 8 denotes a drain pan, 9 denotes a fan motor, and 10 denotes a blow air passage.

In the case of the air conditioner having the above configuration, the switch box 11 is provided at the edge of the bell mouth 6 in the air conditioner main body 1 so as to facilitate maintenance from the air inlet of the decorative panel 2. However, the bell mouth 6 is often arranged in a suction air flow path.

[0004]

However, when the switch box 11 is arranged as described above, since the air W is sucked from the suction hole 13 of the bell mouth 6, a negative pressure is formed at the edge of the suction hole 13. A region L is formed, and the bypass airflow w passing through the gap formed between the switch box 11 and the lid cover 12 covering the opening thereof flows toward the negative pressure region L. If the flow velocity of the bypass airflow w is high, a whistling sound will be generated, which is annoying.

The present invention has been made in view of the above points, and has a simple structure to reduce the flow velocity of a bypass air flow leaking from a gap between a switch box and a lid cover, thereby generating a whistling sound. The purpose is to eliminate.

[0006]

According to the basic configuration of the present invention (the invention of claim 1), as a means for solving the above-mentioned problems, a substantially annular heat exchanger 4 is provided in a casing 3 and the heat exchanger 4 is provided. A blower 5 having a suction side facing down and a blowout side facing the heat exchanger 4 in the center of the fan 4 and a bell mouth 6 arranged on the suction side of the blower 5 are arranged. In an air conditioner in which a switch box 11 provided with a lid cover 12 for covering a lower opening is attached to a bell mouth 6, a bypass air flow w leaking from a joint surface between the switch box 11 and the lid cover 12 is generated by the bell mouth. A blocking member 15 for blocking the mouse 6 from flowing toward the suction hole 13 is provided.

[0007] With the above configuration, the bypass airflow w leaking from the gap formed in the joint surface between the switch box 11 and the lid cover 12 is blocked by the blocking member 15, and the flow velocity thereof is reduced. As a result, generation of a whistling sound can be prevented.

[0008] As in the second aspect of the present invention, the switch box 11 is housed and arranged in a concave portion 14 formed in the bell mouth 6 and the blocking member 15 is constituted by a part of the bell mouth 6. By simply changing the shape of the bell mouth 6, the flow velocity of the bypass airflow w can be reduced without using any special member.

[0009]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

This air conditioner is a ceiling-mounted type air conditioner similar to that already described in the section of the prior art.

That is, as shown in FIG. 1 and FIG. 2, in this air conditioner, the air conditioner main body 1 is disposed above an opening 7 formed in a ceiling C, and the air conditioner main body 1 The decorative panel 2 that covers the opening 7 is attached to the casing 3 of the air conditioner main body 1.
A substantially annular heat exchanger 4, a blower (for example, a turbo fan) 5 in the center of the heat exchanger 4 with the suction side facing downward and the blowing side facing the side of the heat exchanger 4, and the blower 5 and a bell mouth 6 made of a synthetic resin disposed on the suction side of the apparatus. Reference numeral 8 denotes a drain pan disposed below the heat exchanger 4, 9 denotes a fan motor, and 10 denotes a blow-off air passage formed on the outer peripheral side of the heat exchanger 4.

The casing 3 has a substantially hexagonal shape and includes a side wall 3a made of a heat insulating material and a top plate 3b covering an upper portion of the side wall 3a.

A recess 14 for accommodating the switch box 11 is formed at an edge of the suction hole 13 of the bell mouth 6, and a lower end opening of the switch box 11 is covered by a cover 12.

The switch box 11 and the lid cover 12
As shown in FIGS. 2 and 3, a portion on the side of the suction hole 13 on the joint surface with the suction hole 13 is located slightly above the lower end of the suction hole 13, and a vertical portion of the recess 14 on the side of the suction hole 13. The lower end of the wall 14a (i.e., the lip of the suction hole 13 protruding below the joint surface) is provided with a bypass airflow w leaking from the joint surface between the switch box 11 and the lid cover 12 by the bell mouth. 6 is a blocking member 15 for blocking flow in the direction of the suction hole 13.

In the air conditioner having the above configuration, the following operation can be obtained.

As already mentioned in the prior art section,
During operation of the air conditioner, a negative pressure region L is formed at the rim of the bell mouth 6 by the suction airflow W sucked from the suction hole 13, and the joint surface between the switch box 11 and the lid cover 12 is formed. When the gap is formed, the bypass airflow w leaks from the gap.

However, in the present embodiment, a shield for blocking the bypass airflow w leaking from the joint surface between the switch box 11 and the lid cover 12 from flowing toward the suction hole 13 of the bell mouth 6. Since the member (that is, the lower end of the vertical wall 14a) 15 is provided, the bypass airflow w is blocked by the blocking member 15, and the flow velocity is reduced, thereby preventing the generation of a whistling sound. be able to.

Further, in the present embodiment, the switch box 11 is housed and arranged in the concave portion 14 formed in the bell mouth 6, and the closing member 15 is
Since the bell mouth 6 is configured as a part, the flow rate of the bypass airflow w can be reduced without using a special member only by changing the shape of the bell mouth 6.

In the above description, the closing member 15 is constituted by a part of the bell mouth 6 in the embodiment, but the closing member may be constituted by a member separate from the bell mouth. Of course it is good.

[0020]

According to the invention of the present application (the invention of claim 1),
A substantially annular heat exchanger 4 in a casing 3, a blower 5 in the center of the heat exchanger 4 with the suction side facing downward and the blowout side facing the side of the heat exchanger 4, And the bell mouth 6 arranged on the suction side of
In the air conditioner in which a switch box 11 provided with a lid cover 12 for covering the lower opening is attached to the bell mouth 6, the switch box 11 and the lid cover 1 are provided.
The switch box 11 and the cover 1 are provided with a closing member 15 for blocking a bypass air flow w leaking from a joint surface with the bell mouth 2 from flowing toward the suction hole 13 of the bell mouth 6.
Since the bypass airflow w leaking from the gap formed at the joint surface with the second airflow 2 is blocked by the closing member 15, the flow velocity of the bypass airflow w is reduced, thereby preventing the occurrence of whistling noise. There is an excellent effect that you can.

As in the second aspect of the present invention, the switch box 11 is housed and arranged in a concave portion 14 formed in the bell mouth 6, and the blocking member 15 is constituted by a part of the bell mouth 6. By simply changing the shape of the bell mouth 6, the flow velocity of the bypass airflow w can be reduced without using any special member.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an air conditioner main body in an air conditioner according to an embodiment of the present invention.

FIG. 2 is a perspective view of an air conditioner main body in the air conditioner according to the embodiment of the present invention.

FIG. 3 is an enlarged sectional view of a main part of the air conditioner according to the embodiment of the present invention.

[Explanation of symbols]

1 is an air conditioner main body, 3 is a casing, 4 is a heat exchanger,
5 is a blower, 6 is a bell mouth, 11 is a switch box, 12 is a lid cover, 13 is a suction hole, 14 is a recess, 14
a is a vertical wall, 15 is a blocking member, W is a suction air flow, and w is a bypass air flow.

Claims (2)

[Claims] In a casing (3), a substantially annular heat exchanger (4) and a heat exchanger (4) having a suction side facing downward and a blowing side facing the heat exchanger (4) at the center of the heat exchanger (4). A blower (5) on the side of 4) and a bell mouth (6) arranged on the suction side of the blower (5) are arranged, and the bell mouth (6) has a lid for covering a lower opening. Cover (12)
An air conditioner provided with a switch box (11) provided with a bell mouth (11), wherein a bypass air flow (w) leaking from a joint surface between the switch box (11) and the lid cover (12) flows through the bell mouth ( The air conditioner according to claim 6, further comprising a blocking member (15) for blocking flow in the direction of the suction hole (13). 2. The switch box (11) is housed and arranged in a recess (14) formed in the bell mouth (6), and the blocking member (15) is held by a part of the bell mouth (6). The air conditioner according to claim 1, wherein the air conditioner is configured.