JP3013829B2 - Air conditioner - Google Patents

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, the bell mouth 6 is attached to a suction side of the bell mouth 6.
A recess 14 is formed in the mouth of the suction hole 13 of the
The recess 14 includes a lid cover 12 that covers the lower opening.
The switch box 11 is attached, and the joint surface between the switch box 11 and the lid cover 12 is attached .
The lid cover 12 there to kick the rim of the suction hole 13
The closing member 15 projecting downward from the bell mouth 6
It consists of a part .

[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. Moreover, 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.

[0008]

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 FIGS. 1 and 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 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 background 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, the shielding air that shuts off the bypass airflow w leaking from the joint surface between the switch box 11 and the cover 12 in the direction of the suction hole 13 of the bell mouth 6 is closed. 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.

[0018]

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 a lower opening is attached to the bell mouth 6, the bell mouth 6 is provided on the suction side of the bell mouth 6.
A recess 14 is formed at the edge of the suction hole 13 of the
14, a switch provided with a lid cover 12 for covering the lower opening.
The switch box 11 is attached and the front of the joint surface between the switch box 11 and the lid cover 12 is
At the edge of the suction hole 13 and below the lid cover 12
The closure site material 15 shielding projecting part of the bell mouth 6
Ri configuration to the switch box 11 and the bypass air flow w leaking from the gap formed at the interface between the lid cover 12
Is blocked by the closing member 15, so that the flow velocity of the bypass airflow w is reduced, and there is an excellent effect that generation of a whistling sound can be prevented. In addition, there is also an effect that the flow velocity of the bypass airflow w can be reduced without using a special member only by changing the shape of the bellmouth 6.

[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.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F24F 1/00 401

Claims (1)

(57) [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 equipped with a switch box (11) provided with a bell mouth (6) on the suction side of the bell mouth (6).
Are recessed at the rim of the suction hole (13) of the bell mouth (6).
(14) and a lower opening is formed in the recess (14).
Switch box with lid cover (12) to cover
(11) is attached, and the front of the joint surface between the switch box (11) and the lid cover (12).
The lid cover (12) at the mouth of the suction hole (13)
The closing member (15) projecting downward is connected to the bell mouth.
An air conditioner characterized by comprising a part of (6) .