JP3341975B2 - Air-conditioning silence box - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound deadening box used in a building air conditioning system.

[0002]

2. Description of the Related Art As an air conditioning system for a building, a fan for cooling and heating is supplied to a living space from an outlet provided on a ceiling surface, and air in the living space is arranged from an exhaust hole of each room to a space above the ceiling. It has been practiced to create a comfortable living environment by intensively sucking up and discharging to the outside of the building.

[0003] In the above air conditioning system, the noise caused by the operation noise of the fan disposed behind the ceiling is prevented from propagating to the living space through the flexible exhaust duct hose piped to the exhaust port of each room. For this reason, it is conceivable to adopt a type having a silencing property as a duct hose for piping.

[0004]

However, in order to provide a duct hose with sound-absorbing properties, it is necessary to form a hose composed of a sound absorbing material such as glass wool. Is very labor-intensive, especially because it is not possible to obtain a long hose that can be cut to any length and use it, and it is necessary to connect short hoses through multiple connectors and pipes. There was a problem that the number of points was large and the work was troublesome, so that the cost had to be high.

In view of the above, a duct hose, which is a long hose having no sound-absorbing property, for example, is formed by spirally winding a synthetic resin tape to form a pipe wall, and forming and expanding the pipe wall with a hard spiral reinforcing body. It is necessary to reduce the noise of the exhaust fan by using a flexible bellows-shaped flexible hose and interposing another part having a sound deadening function in the middle of the duct hose.

SUMMARY OF THE INVENTION The present invention has been made to satisfy such a need. The present invention has excellent noise reduction performance because it aims to reduce noise of a duct hose, is easy to assemble, and is connected to a duct hose when it is interposed in a duct line. It is an object of the present invention to provide a silencing box that is easy to remove.

[0007]

SUMMARY OF THE INVENTION The present invention has the following configuration to solve the above-mentioned problems.

(1) Used in an air conditioning system that sucks air from a living space and discharges the air to the outside of the building, and is interposed in the middle of a pipe of a duct that connects an exhaust fan main body disposed above the ceiling and an exhaust hole of each room. A sound absorbing member having a three-dimensional shape in which an air circulation hole communicating with the duct is provided therein, and a cylindrical connecting portion connecting front and rear ducts at both ends, and the sound absorbing member is provided inside. The sound absorbing member is exposed on the side surface of the open box of the frame with its outer surface covered with a protective sheet. Silence box for air conditioning.

(2) The air-conditioning silencing box according to the above (1), wherein the sound absorbing member is made of a synthetic resin foam having an open-cell structure.

(3) The frame body is formed by joining two half-pieces divided along the axial direction with their divided surfaces in contact with each other. An engaging projection having a wedge portion for retaining is protrudingly provided, and a wedge engaging portion which engages with the wedge portion by inserting the engaging projection into the other half body correspondingly. The air-conditioning silencing box according to the above (1), wherein the air-conditioning silencing box has a hole.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 3 is a schematic diagram showing an example of an air conditioning system for a building in which the air-conditioning muffler box of the present invention is used, and an exhaust fan body 20 disposed behind the ceiling of the building.
A flexible duct hose 21 is occupied in the form of an octopus and connected to the exhaust holes 22 of each room such as a living room, kitchen, bathroom, etc., and the air in each room is ducted from each exhaust hole 22 by driving the fan body 20. The air is sucked up through the hose 21 and exhausted from the exhaust duct 23 collectively to the outside of the building for ventilation. In order to prevent the operation sound of the fan body 20 from being transmitted to each room through the duct hose 21, the duct The hoses 21 and 21 are connected by interposing a silencing box 24 therebetween.

FIG. 1 shows the details of the above-described sound deadening box. FIG. 1 is a partially cutaway front view of the sound deadening box 1 having a substantially rectangular parallelepiped shape, and a cowl portion (mouth) 17 of a duct hose (not shown) is shown. The outer shape is defined by a synthetic resin frame 2 in which a cylindrical connecting portion 3 to be connected is projected from the side plate 4, and an air flow hole 11 communicating with the inside of the connecting portion 3 is formed inside the frame 2. A perforated sound absorbing member 10 made of a synthetic resin foam having an open cell structure such as urethane foam is accommodated and held.

The frame 2 has a front surface, a rear surface,
An open surface 16 from which the sound absorbing member 10 is exposed is formed on four surfaces, a flat surface and a bottom surface, and the sound absorbing member 10 is covered with a protective sheet 12 made of a synthetic resin sheet such as polyethylene. It is exposed on the surface.

Since the sound absorbing member 10 has an open-cell structure, the protective sheet 12 is used to prevent the air flowing inside from leaking to the outside unless the surface is covered. As long as the sound absorbing member 10 is completely covered with a thick plate (frame) as described later, the sound absorbing member 10 is also used for a reason that the sound absorbing effect is large.

The frame 2 is formed by joining the half-pieces 5 and 5 (see FIG. 2), which are divided into two along the axial direction, with their divided surfaces in contact with each other. At the abutting portion of the left and right half side plates 6, 5, a retaining wedge-shaped engaging projection 7 protruding from one half 5 beyond the division surface is attached to the other half 5. It is inserted into and engaged with an engaging hole 8 provided with a wedge engaging portion 9 provided at an opposing portion. At this time, the semi-cylindrical connecting portions 13 and 13 are integrated by fitting a pin 14 integrally projecting on one of the contact surfaces into a hole 15 formed on the other.

It is preferable that the engagement of the halves 5 and 5 is performed at two locations above and below each side surface. In this case, the wedge-shaped engaging projections 7 An engagement hole 8 is provided on the upper part, a wedge-shaped engagement projection 7 is provided on the upper part on the left side, an engagement hole 8 is provided on the lower part, and a pin 14 is provided on the lower part of the contact surface of the right connecting part 13. By providing a hole 15 in the upper part, conversely, by providing a pin 14 in the upper part of the contact surface of the left connecting part 13 and a hole 15 in the lower part, it is sufficient to prepare one kind of half body 5 of the same shape. The frame body 2 can be configured by fitting the split bodies 5 and 5 together and assembling them.

The silencing box 1 configured as described above
However, in the air conditioning system for a building as shown in FIG. 3, which is disposed between duct hoses, the result of testing the sound deadening performance of the sound deadening box of the above embodiment will be described below along with a comparative example.

As shown in FIG. 4, at a test temperature of 15 ° C., a blower 30 and a bellows-like synthetic resin duct hose 31 (6M)
The sound pressure level was measured by an integrating ordinary sound level meter 33 (manufactured by RION) placed at a position 40 cm away from the end of the sound deadening box 32 and the sound deadening box 32 was arranged. It was shown to. However, blower 3
The noise level of the main unit is 74.5 dB, and the noise level in the room under test is 35.0 dB.

Comparative Example 1 (without silencer box) A case where the silencer box 32 shown in FIG. 4 was removed, and the sound level meter 33 was placed 40 cm away from the end of the duct hose 31 and measured.

Comparative Example 2 A case where the sound absorbing member of the sound deadening box 32 was not exposed and the whole surface was completely covered with a thick plate and the measurement was performed.

[0022]

[Table 1]

From the results shown in Table 1, it was proved that the embodiment as the sound deadening box of the present invention had excellent sound deadening properties. The reason that Comparative Example 2 is inferior to the example in noise reduction effect is presumed to be that the internal sound is reflected by the thick plate and causes resonance.

[0024]

The air-conditioning silencing box of the present invention is excellent in silencing, and suppresses the noise of the fan body without using a special duct hose having the silencing property, so that the noise is transmitted to the living space. Can be prevented. In addition, the assembling is easy, and the connecting work with the duct hose is simple and easy to handle when interposed in the duct hose.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view of a muffling box of the present invention.

FIG. 2 shows a half of a frame of the sound deadening box of the present invention;
(A) is a front view, (B) is a plan view, and (C) is a side view.

FIG. 3 is a schematic diagram illustrating a building air conditioning system.

FIG. 4 is a schematic diagram of a sound deadening performance test.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Silence box 2 Frame 3 Connecting part 4 Side plate 5 Half body 6 Half side plate 7 Wedge-shaped engaging projection 8 Engaging hole 9 Wedge engaging part 10 Sound absorbing member 11 Air flow hole 12 Protective sheet 13 Half cylindrical connection Part 14 Pin 15 Hole 16 Opening surface 17 Cose part of duct hose 20 Fan body 21 Duct hose 22 Exhaust hole 23 Exhaust duct 24 Silence box 30 Blower 31 Duct hose 32 Silence box 33 Sound level meter

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Seiji Hattori 6 Titan Sports Remer Co., Ltd., Shizuoka Pref. Inside the factory (72) Inventor Masataka Morikawa No. 6, Tanyo, Kakegawa-shi, Shizuoka Prefecture Inside the Shizuoka factory, Tiger Sportser Co., Ltd. (56) References JP-A-49-81736 (JP, A) JP-A-8-286673 (JP, A) JP-A-6-156052 (JP, A) JP-A 5-83578 (JP, U) JP-A 3-1396 (JP, U) JP-A 63-107499 (JP, U) JP-A 57- 169889 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) F24F 13/02 G10K 11/16 F16L 55/02 F16L 55/04

Claims (3)

(57) [Claims] 1. An air conditioning system that draws air from a living space and discharges the air to the outside of a building. The air control system is disposed in the middle of a duct connecting a main body of an exhaust fan disposed behind a ceiling to an exhaust hole of each room. A muffling box,
A three-dimensional sound-absorbing member with an air circulation hole communicating with the duct inside, and a cylindrical connecting portion that connects the front and rear ducts at both ends, and a box-shaped housing that houses and holds the sound-absorbing member inside An air-conditioning silencing box, comprising: a frame; wherein the sound absorbing member is exposed on a side surface of an open box of the frame with an outer surface thereof covered with a protective sheet. 2. The air-conditioning silencing box according to claim 1, wherein the sound absorbing member is made of a synthetic resin foam having an open-cell structure. 3. The frame body is formed by joining two divided halves along the axial direction with their divided surfaces in contact with each other. An engaging hole having a wedge engaging portion having a wedge portion for stopping protruding therefrom and correspondingly engaging the wedge portion by inserting the engaging protruding portion into the other half. 2. The air-conditioning silencing box according to claim 1, further comprising: