JP3079451B2 - Silencer equipped with check valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of supplying noise generated by a blower, noise caused by airflow in a pipe on a discharge section connected to the blower, and airflow on the discharge side to a container such as an air dome or a tank. The present invention also relates to a silencer provided with a check valve for simultaneously and effectively removing noise generated by airflow, vibration, and the like at the check valve.

[0002]

2. Description of the Related Art Conventionally, when gas such as air is supplied to a container such as an air dome or a tank using a blower, a pipe on a discharge portion side connected to the blower is connected to a container such as an air dome or a tank. A check valve is provided at the entrance side to prevent backflow of gas at the entrance side. Also, as one of measures against noise caused by airflow sent from a pipe on a discharge section side of a blower, it is known to attach a muffler to a terminal end of the pipe. Furthermore, the conventional silencers can be roughly classified into two types: a reactive silencer that mainly uses sound wave reflection and interference, and an absorption type silencer that mainly uses sound wave absorption by a sound absorbing material. There is a composite type silencer, and the reactive silencer is further classified into an extended type silencer in which a part of a flow path is enlarged and a resonant type silencer utilizing a resonance phenomenon of a sound wave.

[0003]

When a gas such as air is supplied to a container such as an air dome or a tank using a blower, noise from the blower blown from a pipe on the discharge section side of the blower and an airflow in the pipe. Insufficient noise countermeasures, and because gas such as air is supplied to containers such as air domes and tanks through a check valve provided to prevent gas backflow, Secondary noise was generated by airflow. Furthermore, when supplying gas such as air to a container such as an air dome or a tank via a check valve, the check valve must be operated in a conventional manner so that the check valve can be operated sensitively even by a weak airflow. The valve structure was not enough. Furthermore, when a silencer is attached to the end of the pipe, the gas released to the outside is released in a muffled state, but the noise generated at the discharge part side and the check valve is reduced. No consideration was given. The present invention has been made in view of the above points, and its object is to effectively utilize a conventionally known silencer and to reduce noise caused by airflow sent from a pipe on a discharge section side of a blower and when passing a check valve. Silencer equipped with a check valve that simultaneously solves the secondary noise caused by the air flow without taking up installation space, and that allows the check valve to operate sensitively and reliably even with a weak air flow Is to provide.

[0004]

According to the present invention, there is provided a silencer including a check valve according to the present invention, which connects a discharge section of a blower to an inlet of a silencer box having an inlet and an outlet. A partition plate was provided in the sound deadening box, and the partition plate was provided on the partition plate .
Ri Na installed a check valve in the opening, the check valve is mute box
Hanging above the opening of the partition in the box through an elastic body
A thin-film valve element, a valve seat provided at the periphery of the opening, and the valve
The flexible material seal attached to the seat and the valve
It is formed with a backstay supported by the mouth .
The sound deadening box has an inner wall and a middle partition plate lined with a sound deadening material. In addition, the above mute
The inlet and outlet of the box are in the flow direction with the partition plate
Bends and changes at remote locations.
The outlet is provided at the far end behind the check valve .

[0005]

[Function] The air flow discharged from the discharge part side of the blower enters the enlarged sound deadening box from the narrow inlet of the sound deadening box,
Here, the sound is first attenuated, and then the sound is reflected and interfered in one room in the sound deadening box partitioned by the middle partition plate to further attenuate the sound, and then the airflow in this one room is reduced. Generates noise when passing through a narrow check valve, but the noise when passing through the check valve is attenuated because the check valve is built into the muffler box. After passing through the check valve, it again enters the other enlarged room in the muffler box separated by the middle partition plate, where the sound is attenuated again, and furthermore, sound reflection and interference occur in the other room. The air flow which has been attenuated and finally exits from the outlet of the silencing box is quietly supplied to a container such as an air dome or a tank . The check valve is
A thin-film valve element suspended above the opening of the middle partition plate in the sound deadening box via an elastic body, a valve seat provided on the peripheral edge of the sekiguchi portion, a flexible material seal attached to the valve seat, Because the valve body was formed with a backstay that supported the opening at the time of road interruption, the thin-film valve body was usually in contact with the flexible material seal and was sent from the blower to one chamber in the sound deadening box The air flow moves the valve body away from the seal and sends it to the other chamber. The valve body has a thin film suspended via an elastic body so that it operates even with a slight airflow, and the valve body contacts the seal to prevent the airflow from flowing from the other chamber back to one chamber, and the opening is opened. Close. At this time, the valve body of the thin film body is securely supported by the back stay, thereby guaranteeing a completely closed state.

[0006] By lining the inner wall and the middle partition plate of the sound deadening box with a sound deadening material, respectively, when sound waves of energy enter the inner wall and the middle partition plate, respectively.
Sound waves of a part of the energy are absorbed and attenuated in the sound absorbing material. Further, inlet and outlet of the muffler box, by providing respective positions flow direction at a partition plate distant be changed by bending, to enhance the damping effect of the inputted and reflected many repetitive sound Further, the outlet is provided at the far end side behind the check valve to further enhance the sound damping effect .

[0007]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the present invention. FIG. 1 is a perspective explanatory view of the silencer having a rectangular parallelepiped shape and an upper wall is removed. FIG. 2 shows another embodiment of the present invention. FIG. 3 is an enlarged sectional explanatory view showing a main part of a check valve, in which (a) shows a state where a valve body is opened,
(B) shows a state in which the valve body is closed, and FIG. 4 is a side sectional explanatory view of the muffler when a plurality of blowers are connected. The sound deadening box 1 is formed in a rectangular parallelepiped housing shape as shown in FIG. 1 or in a cylindrical shape as shown in FIG. An intermediate partition plate 4 is provided at an intermediate portion of the muffling box 1 to partition one chamber 2 and the other chamber 3. Further, an inlet 5 for gas such as air is formed in one chamber 2 of the silencing box 1, and an outlet 6 for gas such as air is formed in the other chamber 3 . Inlet 5 of one chamber 2 of an anti-sound box 1,
It is connected to the pipe 9 on the discharge section side of the blower 8 .

An opening 10 is provided at a predetermined position of the middle partition plate 4 of the sound deadening box 1, and a check valve 7 is mounted. Check valve 7
The elastic member 13 such as a rubber piece hanging from a hook portion 12 fixed to an upper portion of the opening 10 is provided with a valve body 11 made of a thin film such as a metal such as stainless steel or a synthetic resin material so as to operate even under a small pressure. And attach it as if hanging down. Then, the valve element 11 is set so that it can be completely shut off when the blower 8 is stopped.
The valve body 11 is deformed by contacting the seal 15 made of a flexible material such as urethane material attached to the valve seat 14 on the periphery of the opening 10 and providing a backstay 17 assembled in a lattice shape or the like in the opening 10 to deform the valve body 11 and to remove gas. Hold so that it does not leak.

[0009] The check valve 7 of FIG. 3 (a), (b), the opening 1 of the partition plate 4 in the silencer box 1
0 is a thin-film valve element 1 suspended above an elastic body 13
1, a valve seat 14 provided on the periphery of the opening 10, a seal 15 of a flexible material attached to the valve seat 14, and a backstay 17 for supporting the valve element 11 at the opening 10 when the flow path is cut off. When the supply of the airflow from the blower 7 side is stopped, the thin film valve 11 is usually provided with a soft material seal 1.
5 abuts. However, when the blower 8 is operated and the airflow is supplied from the blower 8 to one chamber 2 in the sound deadening box 1, the valve body 11 separates from the seal 15 and is sent to the other chamber 3. At this time, the thin film is suspended via the elastic body 13 so that the valve body 11 operates even with a slight airflow, and the valve body 11 is separated from the other chamber 3 so that the airflow does not flow back to the one chamber 2. The state comes into contact with the seal 15 from the state. The thin-film valve element 11 is supported by the back stay 17 attached to the opening 10, and the backflow is completely prevented without the valve element 11 being deformed. In addition,
The back stay 17 is formed by one or a plurality of bars or lines, or is formed by a lattice or a net.

[0010] one chamber 2 and the other chamber 3 of the silencer box 1
For example, a lock is provided on both inner walls of the
Wool, glass wool, urethane foam and vinyl
Lined with silencing material 18 (including sound absorbing material) such as ponge or wool
To enhance the noise reduction effect. Thus, the silence box 1
When the sound wave of the energy of the airflow sent from the blower 8 is incident on the inner wall and the middle partition plate 4, respectively, the inner wall and the middle partition plate 4 are lined with the sound deadening material 18. Is absorbed and attenuated in the sound absorbing material. Further, the inflow port 5 and the outflow port 6 of the sound deadening box 1 are provided at distant positions where the direction of the flow path is bent and changed with the partitioning plate 4 therebetween, so that the sound is attenuated while repeating the incident reflection. The effect will be further enhanced. Further, by providing the outlet 6 behind the valve body 11 of the check valve 7 at a far end such as a corner portion far away, the sound attenuation effect is further increased.

The inlet 5 and the outlet 6 of the muffling box 1 are
It is provided at a position far apart where the direction of the flow path is bent and changed across the partition plate 4. In this case, the outflow port 6 is provided on the terminal side farther behind the check valve 7 to be described later, that is, in the case of the silencing box 1 having a rectangular parallelepiped housing shape, on the upper corner side of the other chamber 3. Is provided on the upper end side of the other chamber 3.

FIG . 4 shows a case in which a plurality of blowers are connected. One chamber 2 is divided into two chambers 2 and 2 via a partition plate 16, and each of the chambers is provided with a pipe on the discharge section side of each blower 8. (Not shown) are provided, respectively. And a middle partition plate 4 that partitions the inside of the muffling box 1
Are provided with corresponding check valves 7, 7, respectively. In addition, the point that the outlet 6 provided in the other chamber 3 partitioned by the middle partition plate 4 is provided behind the check valve 7 at a far corner side is to enhance the above-described silencing effect.

[0013] Next, the operation state of the above embodiment. As shown in FIGS. 1 and 2, the airflow discharged from the discharge unit side of the blower 8 enters the inlet 5 of the sound deadening box 1 through the pipe 9. From the narrow inlet 5 it enters one of the chambers 2 in the enlarged silencing box 1 where the airflow is diffused and the first sound is attenuated. Then, in one chamber 2 in the sound deadening box 1 partitioned by the middle partition plate 4, the airflow repeatedly hits the inner wall and the middle partition plate 4, respectively, and the sound is reflected and interfered to further attenuate the sound. Next, when the airflow in the one chamber 2 passes through the narrow check valve 7 again, noise is generated, where secondary noise is generated. However, since the entire check valve 7 is built in the muffling box 1, noise when passing through the check valve 7 is attenuated in the muffling box 1. After the airflow passes through the check valve 7 and enters the other enlarged chamber 3 in the muffling box 1 partitioned by the middle partition plate 4 again, the airflow is diffused and the sound is further attenuated. Becomes Further, the air flow repeatedly hits the inner wall and the middle partition plate 4 in the other chamber 3, and the sound is reflected and interfered and attenuated.
Finally, the airflow from the outlet 6 of the muffling box 1 is quietly supplied to an air dome, a container such as a tank, or the like, so that noise given to the outside is greatly reduced.

[0014]

As can be seen from the above description, the present invention connects the discharge section side of the blower and the inflow port of the silencer box having an inflow port and an outflow port, and inserts a partition plate in the muffler box. the provided, as a structure for installing a check valve in an opening provided in the intermediate partition plate, and the check valve is in the inside silencer box
Of the thin film suspended above the opening of the partition plate through the elastic body
A valve body, a valve seat provided on the periphery of the opening, and an attachment to the valve seat
Flexible material seal and valve body supported by opening when flow path is cut off
Since formed by the back stay of the noise caused by airflow sent from the discharge side of the pipe of the blower, and the secondary noise due to the air flow at the time of check valve passage, it is possible simultaneously solved together without taking the installation space Against weak airflow
Excellent effect that the check valve is sensitive and operates reliably
To play.

Further, the noise suppressor of the present invention, the airflow discharged from the blower is expanded in one chamber enters from the inlet of the silencer box, further the inner wall and the partition plate of one chamber of the silencer box in each some of sonic energy incident is absorbing, the noise of the air flow generated at the time of passing through the check valve attached to the inner partition plate is sound absorbing at muffling box again, into the other chamber of the silencer box from the check valve sometimes,
The air flow is expanded, and a part of the incident sound wave energy is absorbed by the inner wall of the other chamber and the partition plate, respectively, and the outlet of the sound deadening box is at a dead end, a far end far away from the inlet, at a dead point. It is provided in the surrounding area where there is a lot of noise reduction material. As a result, the noise is sufficiently absorbed, interfered and discharged inside the noise reduction box. The sound-absorbing effect due to the interference effect due to the phase difference / bending is combined, so that gas such as air can be quietly supplied to a container such as an air dome or a tank.

[Brief description of the drawings]

FIG. 1 is a perspective explanatory view showing one embodiment of the present invention, in which an upper wall is removed when a silencing device has a rectangular parallelepiped shape.

FIG. 2 is a perspective explanatory view showing another embodiment of the present invention, in which a muffler has a cylindrical shape.

FIG. 3 is an enlarged cross-sectional explanatory view showing a key group of check valves;
(A) shows a state where the valve body is open, and (b) shows a state where the valve body is closed.

FIG. 4 is an explanatory side sectional view of a muffler when a plurality of blowers are connected.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 muffling box 2 one chamber 3 other chamber 4 middle partition plate 5 inflow port 6 outflow port 7 check valve 8 blower 11 valve body 13 elastic body 14 valve seat 15 seal 17 back stay 18 muffler

Continuation of the front page (56) References Japanese Utility Model Showa 56-27311 (JP, U) Japanese Utility Model Showa 54-71036 (JP, U) Japanese Utility Model Showa 59-163115 (JP, U) (58) Fields surveyed (Int) .Cl. ⁷ , DB name) F01N 1/08 F01N 1/10

Claims (3)

(57) [Claims] 1. A discharge part side of a blower is connected to an inlet of a sound deadening box having an inlet and an outlet, and a middle partition plate is provided in the sound deadening box, and an opening provided in the middle partition plate is provided.
Will be installed a check valve in part, the check valve is, mute box
A thin film hanging through an elastic body above the opening of the inner partition
A valve body of a membrane body, a valve seat provided on the periphery of the opening, and
Attached flexible material seal and valve body opening when flow path is shut off
A silencer comprising a check valve, wherein the silencer is formed by a back stay supported by the back stay . 2. The sound deadening box includes an inner wall and a partition.
Muffler provided with the check valve of claim 1, wherein the lined each plate with sound-deadening material. 3. An inflow port and an outflow port of the sound deadening box,
The direction of the flow path bends and changes over the partition plate.
In each position, with the outlet far end behind the check valve
Muffler provided with the check valve according to claim 1 or 2, characterized in that provided on the section side.