JP2003206556A - Muffling device for draining noise - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a muffling device for draining noise formed in a simple structure with an excellent efficiency and capable of assuring a stable muffling performance even if an installation period becomes long. <P>SOLUTION: This muffling device for draining noise comprises Helemholtz resonance type muffling member, a flexible shielding screen installed under the Helmholtz resonance type muffling member at a distance from and opposedly to the inlet opening forming plate of the Helmholtz resonance type muffling member, first and second connection pipes installed on the underside of a space partitioned by the shielding screen at positions oppose to each other to be connected to a drain side-pull pipe, and a drain flow passage communicating with the insides of the pair of first and second connection pipes, partitioned from the Helmholtz resonance type muffling member, and allowing the drain to flow therein for muffling. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water supply / drainage device (sink, vanity, toilet bowl, unit bath, laundry, for example, which is installed in a drainage horizontal pipe of a water supply / drainage sanitary facility and connected to the horizontal pipe The present invention relates to a silencer for drainage noise that suppresses the drainage noise radiated from the drainage outlet of bread etc.).

2. Description of the Related Art It is said that noise in a drainage pipe installed in a building such as a condominium such as a condominium is about 85 to 95 dBA when the drainage flows down.

As described above, since the noise radiated from the drainage stack is large, the noise radiated from the drainage port of the water supply / drainage equipment such as a sink connected to the drainage stack is conspicuous due to the so-called masking effect. It did not exist and was not regarded as an important issue for noise prevention in this area.

However, the introduction of a so-called silent system and the like has gradually taken soundproofing measures against the drainage stack pipe, and in such a situation in recent years, the water supply and drainage equipment such as the sink, which has not been noticed until now, has been adopted. Measures against wastewater noise emitted from drainage outlets have become non-negligible.

However, the sink / vanity /
Since the propagation route of drainage noise radiated from the drainage outlets of water supply and drainage equipment such as toilet bowls, unit baths, washing pans is mainly in the drainage horizontal pipe installed and stored inside the so-called skeleton, it results in obstructing drainage outflow. It is not possible to install such noise suppression equipment, and the noise prevention equipment is constantly exposed to the danger of being submerged by the flow of drainage water and extremely high humidity, and the equipment installed will be corroded. The danger was also pointed out.

In view of the above, the present situation has not been actively proposed in recent years for devices that take measures to muffle noise radiated from the drainage port of a water supply / drainage device such as a sink.

Thus, the present invention is
The sink was devised in view of the above-mentioned conventional problems, and is a silencer having a simple structure, which is efficient, and can secure stable silence even when installed for a long period of time.
It is an object of the present invention to provide a silencer for drainage noise radiated from drainage outlets of water supply and drainage appliances such as vanities, toilet bowls, unit baths, washing pans.

DISCLOSURE OF THE INVENTION The present invention is a muffler installed in a horizontal drain pipe, and comprises a plurality of muffler chambers formed in a honeycomb shape having different internal volumes, and the plurality of muffler chambers. An entrance opening forming plate with different entrance openings,
A Helmholtz resonance type sound deadening member, and a flexible screening curtain provided at a lower position of the Helmholtz resonance sound deadening member facing and facing the entrance opening forming plate of the Helmholtz resonance sound deadening member. And a first connecting pipe and a second connecting pipe, which are provided below the space partitioned by the blocking curtain, and which are provided at opposing positions so as to connect to the horizontal drain pipe
A drainage passage communicating with the inside of the connecting pipe and the insides of the pair of first connecting pipe and second connecting pipe, and being separated from the Helmholtz resonance type sound deadening member through a blocking curtain, through which the drainage to be silenced passes. And a drainage muffler for silencing the drainage noise emitted from the drainage port of each water supply / drainage equipment connected to the drainage horizontal pipe, which is installed in the drainage horizontal pipe. The drainage noise muffling device for a drainage horizontal pipe according to claim 1, wherein the internal volume of the plurality of muffling chambers and the size of the entrance opening can be freely changed to select a frequency band of noise for which muffling is desired. It is characterized by having done.

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to the embodiments shown in the drawings.

The basic silencing structure used in the present invention utilizes a resonance type (Helmholtz resonator) silencing structure. Then, as shown in the drawing, the present invention has a structure in which a silencer portion is provided between the drainage lateral pipes and the flowing water passages.

Here, the muffling mechanism of the resonance type silencer will be described. A honeycomb type resonance chamber having different internal volumes and a small-diameter opening (punching) through which sound energy passes through the respective inlets of the resonance chamber. It is made of metal).

However, by changing the opening size, the opening ratio, and the distance of the back space after passing through the opening, that is, the opening size and the depth size of the honeycomb in the resonance chamber, the frequency at which the noise is suppressed is changed. Wide bandwidth can be selected.

The basic silencing principle of the resonance silencer will now be described. In a cavity whose size is smaller than the wavelength of sound, the air inside acts as a spring. If there is a small opening in the cavity that leads to the outside, the opening (neck)
Since the air moves as a single mass, it mechanically moves like a single resonance system with a weight suspended on a spring. This is called a Helmfortz resonator.

[0010]

[Equation 1] Therefore, as understood from the above equation, the resonance frequency f
₀ , that is, the sound in the frequency band to be muted can be searched for by changing the values of G and V. For example,

[0011]

[Equation 2] When the value of is large, the resonance frequency becomes high. Also,

[0012]

[Equation 3] When the value of is small, the resonance frequency is low.

However, when the sound of this resonance frequency is incident, the air at the entrance opening of the honeycomb type resonance chamber vibrates violently, the sound energy is lost due to the friction loss, and the sound of the resonance frequency is silenced. It will be. By the way
Is a diagram showing the expected value of the muffling according to the present invention,
Indicates the noise level in each frequency band, that is, the sound pressure level (dB). On the other hand, the curve B shows the expected value of noise reduction in each frequency band according to the present invention.

As can be seen from FIG. 3, the degree of noise is such that the sound pressure level (dB) in the frequency band of the low tone part and the high tone part rises at the boundary of the frequency 500HZ (frequency band called the middle tone part). is doing.

Therefore, according to the present invention, it is possible to significantly reduce the sound pressure level (dB) in the low tone portion and the high tone portion.

In FIG. 1, reference numeral 1 indicates a sink in the system kitchen.

A kitchen drainage port 3 is provided at the center of the sink 1, and a resin trapezoidal trap 5 is covered in the kitchen drainage port 3 via a water-sealing section 4 filled with water. ing.

The open end of the resin bowl-shaped trap 5 is housed in the water sealing portion 4 and is filled with water to be hermetically sealed so that insects and odors can be prevented from the drain pipe side. It has become a thing.

As described above, the trapezoidal trap 5 has a water sealing portion 4.
Since it is inside, airtightness is sufficiently secured, but since the trapezoidal trap 5 itself is thin and lightweight, drainage noise from the drainage stack 6 side passes through the trapezoidal trap 5 and drainage. Drainage noise will be radiated from the tableware 7 into the room.

That is, as described above, only one thin resin trapezoid trap 5 is interposed between the drainage stack 6 and the kitchen drainage port 3 of the sink 1 of the system kitchen. In addition, the drainage noise on the side of the drainage stack 6 is transmitted to the room.

Here, the kitchen drainage port 3 is connected to a drainage vertical pipe 6 disposed inside an apartment house such as a condominium. Usually, the drainage vertical pipe 6 is connected to the drainage horizontal drain pipe 2. It Therefore, in the present invention, the muffler 20 is installed in the drainage horizontal pipe 2.

As can be seen from the figure, the silencer 20 first comprises a Helmfortz resonance type silencer 8.

The Helmfortz resonance type sound deadening member 8 has a plurality of sound deadening chambers 17 formed in a honeycomb shape having different internal volumes, that is, in this embodiment, each has a long tubular shape extending vertically. A plurality of different muffling rooms 17,
An inlet opening forming plate 10 attached so that the inlet openings 9 of the plurality of silencing chambers 17 are different from each other.

By changing the internal volumes of the plurality of muffling chambers 8 in this manner, it is possible to muffle noise by selecting the resonance frequency in the band to be muffled.

Thus, the entrance opening forming plates 10 for differentiating the entrance openings 9 of the silencing chambers 17 are attached to the entrance openings 9.

Therefore, the drainage noise from the drainage stack 6 side is such that the sound in the desired frequency band is silenced by the Helmfortz resonance type silencing member 8.

Next, this Helmfortz resonance type sound deadening member 8
Of the opening opening forming plate 10 having a slight distance in the downward direction and facing the plurality of opening openings 9 of the Helmfortz resonance type sound deadening member 8 and having flexibility, for example, thin rubber. Screen 11 made of material
Is attached.

The first connecting pipe 12 and the second connecting pipe 12 having a substantially box-like shape with an opening on the lower side thereof and having a diameter substantially the same as the diameter of the drainage horizontal draw pipe 2 are formed in the front and rear. Connection pipe 13
A drainage inflow passage 14 is provided.

Here, as understood from the figure, the side wall 15 of the drainage inflow passage 14 and the outer side wall 16 of the Helmfortz resonance type sound deadening member 8 are integrally formed and connected. Then, the drainage inflow path 14 is provided below the shutoff screen 11.
There is.

In the above, even if a large amount of drainage is drained from the sink 1 of the system kitchen, the drainage passes through the kitchen drainage port 3 and the first muffler 20 installed between the drainage horizontal pull pipes 2 is installed. 1 through the connecting pipe 12, flows into the drainage inflow passage 14, passes through the second connecting pipe 13, and the drainage stack 6
Flowing to the side.

The drainage noise generated at this time is silenced by the Helmfortz resonance type silencing member 8.

Then, even if a large amount of waste water is discharged, the waste water inflow passage 1
Even if it enters 4, there is no possibility that the screen 11 will flood the Helmholtz resonance type sound deadening member 8 side.

Further, conventionally, when a large amount of drainage is performed, the drainage horizontal pulling pipe 2 is filled with water, and the negative pressure in the drainage horizontal pulling pipe 2 causes a trapezoidal trap 5 immediately before the drainage is completed.
There was a case where the water sealing condition of the machine was cut off for a moment and a loud draining noise was generated.

However, according to the present invention, as shown in the figure, the rubber shielding curtain 11 is deformed so as to be curved downward so that the inside of the drainage inflow passage 14 becomes equal to or lower than the pressure of the sealing depth. 20 itself acts as a pressure adjusting chamber, and measures to cushion the self-siphon.

As described above, the present invention has the above constitution. The drainage noise muffling device according to the present invention has a simple structure, and is capable of ensuring efficient and stable muffling performance even when installed for a long period of time. Sink, vanity, toilet unit It has an excellent effect of being able to provide a silencer for drainage noise emitted from drainage outlets of water supply and drainage equipment such as baths and washing pans.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram (1) of a silencer according to the present invention.

FIG. 2 is a schematic configuration explanatory view (2) of the silencer according to the present invention.

FIG. 3 is an explanatory diagram illustrating a muffling estimated value by a muffling device.

FIG. 4 is a configuration explanatory view illustrating a configuration of a kitchen drainage port.

FIG. 5 is an explanatory diagram of a configuration of a conventional example.

[Explanation of symbols]

1 sink 2 drain horizontal pipe 3 kitchen drain 4 water seal 5 trapezoidal trap 6 drainage stack 7 Drain plate 8 Helmfortz resonance type sound deadening member 9 entrance opening 10 Entrance opening forming plate 11 barrier 12 First connection pipe 13 Second connection pipe 14 drainage inflow path 15 Side wall of drainage inflow channel 16 Helmforz Resonance-type silencer outer wall 17 silence room 20 silencer

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masato Kobayashi             2 Sanbancho, Chiyoda-ku, Tokyo Tobishima Construction Co., Ltd.             Inside the company (72) Inventor Katsuhiro Toyota             Showa Denko Ken 1-7-13 Shiba Park, Minato-ku, Tokyo             Material Co., Ltd. F-term (reference) 2D061 AA01 AA02 AA03 AA04 AB02                 3H025 CA01 CB34

Claims (2)

[Claims] 1. A muffler having a substantially case shape installed in a drainage horizontal pipe, wherein a plurality of muffler chambers are formed in a honeycomb shape with different internal volumes, and downward entrance openings of the plurality of muffler chambers. And a Helmfortz resonance type sound deadening member having a different opening opening forming plate at the top, and the Helmfortz resonance sound deadening member facing the opening opening forming plate of the Helmfortz resonance type sound deadening member facing and facing each other. A flexible blocking curtain provided at a lower position of the member, and a first connecting pipe and a second connecting pipe provided at a lower side partitioned by the blocking curtain, the first connecting pipe and the second connecting pipe being respectively provided to be connected to the drainage horizontal draw pipe. A connecting pipe and a drainage passage communicating with the inside of the pair of the first connecting pipe and the second connecting pipe, and separated from the Helmfortz resonance type sound deadening member through a screen, and through which drainage to be silenced passes. Specially to have Silencer of drainage noise to be. 2. A drainage muffler for silencing the drainage noise emitted from the drainage port of each water supply / drainage equipment connected to the drainage horizontal pipe, which is installed in the drainage horizontal pipe. The drainage noise muffling device for the drainage horizontal pulling pipe, characterized in that the internal volume of the plurality of muffling chambers and the size of the entrance opening can be freely changed so that the frequency band of noise desired to be muffled can be selected. Muffler for drainage noise.