JP2002018357A - Generator of low-frequency sound wave - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely generate sound waves of low frequencies by highly durable and small device at least with one resonance tube connected to a treating vessel for performing treatment such as drying. SOLUTION: A changeover means 5 having a rotary valve element 8 rotationally driven in a valve case 7 is disposed in mid-way of an air supply pipeline 4 arriving at the resonance tube 2 from a compressed air generating source 3. The compressed air from the compressed air generating source 3 is supplied to the resonance tube just at least once during one rotation of the rotary valve element 8 in this changeover means 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for generating a low-frequency sound wave when performing various processes such as drying, heating or cooling using a low-frequency sound wave.

[0002]

2. Description of the Related Art Compressed air is intermittently supplied to one end of a resonance tube connected to a processing vessel for performing various processes such as drying, so that low-frequency waves propagating on standing waves propagate in the resonance tube. At this time, whether the length of the resonance tube is set to 1/4 of the wavelength of the standing wave, or if the processing container is small, a resonance box is provided at the tip of the processing container. Alternatively, by providing a quarter-wavelength resonance tube at the end of the processing container and setting the wavelength to half of the wavelength of the standing wave as a whole, resonance vibration due to sound waves occurs in the container,
By this resonance vibration, various processes such as drying or heating in the processing container can be promoted.

[0003] Patent application publication 3-50 as prior art
In order to generate a low-frequency sound wave in the resonance tube, Japanese Patent Laid-Open No. 5422 proposes a sound wave generator having the following configuration.

That is, a reciprocating piston is provided in a cylinder communicating with one end of the resonance tube, and the piston is reciprocated by the rotation of an electric motor to intermittently supply compressed air to one end of the resonance chamber. , A low-frequency sound wave is generated in the resonance tube.

[0005]

This prior art is a mechanism in which a piston in a cylinder is reciprocated to supply compressed air intermittently to a resonance tube. There is an advantage that the frequency can be arbitrarily changed by increasing or decreasing the number of rotations and, consequently, the number of reciprocations of the piston per unit time.

However, on the other hand, since a mechanism for converting a rotary motion into a reciprocating motion such as a crank mechanism is required, not only the structure is complicated but also the size is increased.
Further, there is a problem that vibration and noise are high.

[0007] In addition to the reciprocating motion of the piston, a large inertial force is generated. In addition, the power loss when converting the rotary motion into the reciprocating motion is large, and the reciprocating piston is greatly worn. Also, there is also a problem that durability is low because a mechanism such as a crank mechanism for converting a rotary motion into a reciprocating motion is easily worn.

An object of the present invention is to provide a device which solves these problems.

[0009]

In order to achieve this technical object, a first aspect of the present invention is to provide a fuel cell system in which a valve is provided in a valve case in the middle of an air supply line from a compressed air generation source to at least one resonance tube. A switching means including a rotary valve body driven to rotate is provided, and the compressed air from the compressed air generation source is supplied to the resonance pipe at least once during one rotation of the rotary valve body in the switching means. Configure. "

[0010] The second aspect of the present invention is that, in the first aspect, the valve case of the switching means has a compressed air inlet port from the compressed air generating source, a compressed air outlet port to the resonance pipe, and Are provided side by side in the axial direction of the rotary valve body, and a compressed air outlet port is connected to the compressed air inlet port at least once during one rotation of the rotary valve body in the switching means. The above-described through-hole is provided, and further, a sealing means is provided at a portion of the outer periphery of the rotary valve body between the compressed air inlet port and the compressed air outlet port to disconnect the ports from each other. " I made it.

[0011] Furthermore, the third aspect of the present invention is based on the first aspect, wherein the compressed air outlet port is divided into two ports.
The two compressed air outlet ports and one of the compressed air inlet ports are provided side by side in the axial direction of the rotary valve body, while inside the rotary valve body in the switching means during one rotation of the rotary valve body. At least once, a through hole is provided so as to connect the compressed air inlet port to both compressed air outlet ports, and a portion of the outer periphery of the rotary valve body between the compressed air inlet port and both compressed air outlet ports. Are provided with sealing means for disconnecting the ports. ].

[0012]

In this configuration, the compressed air from the compressed air generation source is intermittently supplied to the resonance tube by the rotation of the rotary valve body in the switching means.
A low-frequency sound wave can be generated in the resonance tube, and the frequency of the sound wave can be arbitrarily changed by appropriately increasing or decreasing the rotation speed of the rotary valve body in the switching means. By adjusting to the resonance frequency, a large standing wave can be made to exist, or the intensity of the low frequency can be lowered by shifting from the position.

As described above, according to the present invention, a low-frequency sound wave is generated by intermittently supplying the compressed air from the compressed air generation source to the resonance tube by the rotation of the rotary valve body. Compared to the reciprocating type of the prior art, the structure is simple, the size and weight can be significantly reduced, the vibration and noise can be reduced, and the power loss is small and high due to the rotary motion. Durable,
In addition, there is an effect that the adjustment of the low frequency can be extremely easily performed by increasing or decreasing the rotation speed of the rotary valve body.

A second aspect of the present invention provides a compressed air inlet port when the rotary valve body is loosely fitted in the valve case in order to reduce the rotational resistance of the rotary valve body housed in the valve case. The leak of the compressed air in the axial direction between the compressed air outlet port and the compressed air outlet port is provided by providing a through hole inside the rotary valve body, while the compressed air inlet port and both compressed air outlet ports of the outer periphery of the rotary valve body are closed. By providing a sealing means for disconnecting these ports at a portion between them, the number of ports can be surely reduced. Therefore, the generation of low-frequency sound waves in the resonance tube is reduced by using the rotary valve. This can be reliably achieved under the condition that the rotational resistance in the body is reduced.

Still further, with the configuration as described in claim 3, the compressed air is intermittently separately supplied from the two compressed air outlet ports under the configuration having the same effect as in claim 2. Therefore, the present invention can be effectively applied to a case where low-frequency sound waves are simultaneously generated by two switching tubes by one switching means.

In particular, in the configuration of the third aspect, as described in the fourth aspect, the phase when one of the compressed air outlet ports communicates with the compressed air inlet port during one rotation of the rotary valve body. The phase when the other compressed air outlet port communicates with the compressed air inlet port,
By shifting the rotation direction of the rotary valve body by 180 degrees, a low frequency whose phase is shifted by 180 degrees can be supplied to the two resonance tubes sandwiching the processing container by one switching means. As a result, the ends of the two resonance tubes serve as nodes, and the processing container portion serves as an antinode, so that it is possible to surely generate a standing wave sound wave that vibrates greatly with air.

In addition, in the configuration of the third aspect,
As described in claim 5, by providing the two compressed air outlet ports on both sides of the one compressed air inlet port, the sealing means can be improved under the same condition, with the sealing condition being the same. This has the advantage that the rotary valve body can be smoothly rotated to generate a well-balanced standing wave.

[0018]

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

1 to 4 show a first embodiment.

In this figure, reference numeral 1 denotes a processing container for performing a process such as drying, and reference numeral 2 denotes a resonance tube connected to the processing container 1. The length of the resonance tube 2 is In the case where the resonance tube 2 is provided on one side, the wavelength is set to 1/4 of the wavelength of the standing wave in the resonance tube 2, and as shown later, when the resonance tube 2 is provided on both sides, both are combined. The total length is set to half the wavelength of the standing wave. The processing vessel 1 is connected to a resonance tube 2 a having substantially the same length as the resonance tube 2.

Reference numeral 3 denotes a compressed air generation source such as a blower or an air compressor. An air reservoir is provided in a compressed air supply line 4 from the compressed air generation source 3 to one end of the resonance tube 2. A means for switching the compressed air supplied to the resonance tube 2 so as to be intermittently intermittent by the rotation of a motor 6, that is, a switching means 5, is provided.

As shown in FIG. 2, the switching means 5 comprises a hollow valve case 7 and a rotary valve element 8 which rotates in the valve case 7. The valve case 7 has a substantially cylindrical shape. The valve case 7 includes a compressed air inlet port 9 to which a portion 4a from the compressed air supply source 3 of the compressed air supply line 4 is connected, and a resonance pipe 2 of the compressed air supply line 4. The compressed air outlet port 10 to which the portion 4b is connected is provided side by side in the axial direction, and one end of the valve case 7 is closed by a cover plate 11.

On the other hand, the rotary valve body 8 is
The rotary valve body 8 is rotatably supported by bearings 12 and 13 provided at both ends thereof. One end of the rotary valve body 8 protrudes from the inside of the valve case 7 and connects the coupling 14 to the motor 6. Through the motor 6 or the motor 6
The rotation speed of the rotary valve body 8 is controlled by the control means 15 so that the rotation speed of the rotary valve body 8 is controlled by the power transmission through a transmission mechanism (not shown). The control is performed to increase or decrease, or the transmission mechanism is configured to increase or decrease.

A through hole 16 extending in the axial direction of the rotary valve body 8 is formed in the rotary valve body 8. The inside of the through hole 16 is always connected to the compressed air inlet port 9 through an inlet side opening 17. It is configured to communicate.

A portion of the rotary valve 8 at the compressed air outlet port 10 is configured to fit closely to an inner peripheral surface 7a of the valve case 7, and the portion is provided with the through hole. An outlet opening 18 communicating with the compressed air outlet port 10 is provided once during one rotation of the rotary valve element 8.

The portion of the rotary valve element 8 on the side of the compressed air inlet port 9 is provided on the inner peripheral surface 7 of the valve case 7.
A gap is provided between the rotary valve 8 and the rotary valve 8 to reduce the rotational resistance of the rotary valve 8.

In the valve case 7, at a portion where the rotary valve element 8 protrudes from the valve case 7, a sealing means 19 is provided for contacting the outer peripheral surface of the rotating rotary valve element 8. Sealing means 20 is provided at a portion of the outer periphery of the body 8 between the compressed air inlet port 9 and the compressed air outlet port 10 to disconnect the gap therebetween in a non-communicating manner.

This sealing means 20, for example, presses a rotating seal ring 20b provided on the rotating rotary valve body 8 side with a spring 20c against a fixed sealing ring 20a provided on the non-rotating valve case 7 side. A configuration in which air leakage between the compressed air inlet port 9 and the compressed air outlet port 10 is prevented by sliding of the rotary seal ring 20b against the fixed seal ring 20a in contact therewith. .

In this configuration, during one rotation of the rotary valve body 8 in the valve case 7, the outlet opening 18 at one end of the through hole 16 in the inside thereof communicates with the compressed air outlet port 10 on the valve case 7 side. The compressed air from the compressed air generating source 3 can be supplied to the resonance pipe 2 only when the compressed air is generated. In other words, the compressed air from the compressed air generating source 3 Since the rotation is intermittently supplied to the resonance tube 2, a low-frequency sound wave can be generated in the resonance tube 2.

The frequency of the sound wave at this time can be arbitrarily changed by appropriately increasing or decreasing the rotation speed of the rotary valve body 8 in the switching means 5 by the control means 15 or a speed change mechanism.

In the above configuration, in order to reduce the rotational resistance of the rotary valve body 8, the fitting of the rotary valve body 8 to the inner peripheral surface of the valve case 7 must be loosened. If the fitting of the parts is loosened, the compressed air leaks in the axial direction between the compressed air inlet port 9 and the compressed air outlet port 10, thereby reducing the sound waves in the resonance tube 2.

To cope with this, as described above, the through hole 16 is provided inside the rotary valve body 8, and the compressed air inlet port 9 and the compressed air outlet port 9 of the outer periphery of the rotary valve body 8 are provided. A seal means 20 is provided at a portion between the first and second seals 10 so as to block the communication therebetween.

With such a configuration, the rotary valve 8
When the fitting of the portion of the compressed air outlet port 10 of the valve case 7 to the inner peripheral surface 7a is loosened, the compressed air is compressed along the outer peripheral surface of the rotary valve 8 from the outlet opening 18 provided in the rotary valve 8. Leakage of the compressed air toward the air outlet port 10 occurs, and the sound waves are attenuated. Since it is not possible to provide a seal for preventing the compressed air from leaking along the circumferential direction, the present invention copes with this problem by tightly fitting the rotary valve body 8 to the valve case 7 at this portion. are doing.

With these configurations, since the leakage of the compressed air between the compressed air inlet port 9 and the compressed air outlet port 10 can be reliably reduced, a low-frequency sound wave is generated in the resonance tube 2. This can be reliably achieved in a state where the rotational resistance of the rotary valve body 8 is reduced.

In the above embodiment, a gap is provided between the portion of the rotary valve element 8 on the side of the compressed air inlet port 9 and the inner peripheral surface 7b of the valve case 7, while the rotary valve element 8 Of the compressed air outlet port 10 is closely fitted to the inner peripheral surface 7a of the valve case 7 so that the compressed air inlet port 9 and the compressed air outlet Although it was configured to communicate with the port 10, instead of this, a gap is provided between the compressed air outlet port 10 of the rotary valve body 8 and the inner peripheral surface 7 b of the valve case 7. On the other hand, by fitting the portion of the rotary valve element 8 on the side of the compressed air inlet port 9 closely to the inner peripheral surface 7b of the valve case 7, once during one rotation of the rotary valve element 8, Only with compressed air inlet port 9 A compressed air outlet port 10 may be configured to communicate.

Further, by providing a plurality of through holes 16 in the rotary valve body 8, the compressed air inlet port 9 and the compressed air outlet port 10 communicate with each other a plurality of times during one rotation of the rotary valve body 8. In this way, by making a communication a plurality of times during one rotation, the number of rotations of the rotary valve body 8 can be reduced.

In the case where the rotary valve body 8 is rotatably supported by the bearings 12 and 13 provided at both ends thereof as in the first embodiment, the two bearings 1 are used.
One of the bearings 12 and 13 is provided at a portion where the rotary valve element 8 protrudes from the valve case 7 and can appropriately supply oil thereto.
Since the cover plate 11 is completely closed, it cannot be refueled.

Therefore, as this bearing 13, as shown in FIG. 3, a seal or shield is provided on both sides thereof, and a double seal or double shield type bearing formed by filling a lubricant therebetween is to be used. However, when the two seals or the two shield type bearings 13 are used, if the pressure of the compressed air acts on only one side thereof, the internal lubricant will be pushed out by the pressure. The same pressure may be applied to both sides of the bearing 13 by providing communication passages 21 communicating on both left and right sides of the bearing 13 outside the both seals or both shield type bearings 13.

As a modified example of the first embodiment, as shown in FIG. 4, instead of providing the compressed air inlet port 9 in the valve case 7, the compressed air inlet port 9 is provided. , A cover plate 11 that closes one end of the valve case 7.
It is possible to omit the provision of the communication passage 21 with respect to.

Next, FIGS. 5 and 6 show a second embodiment.

In the second embodiment, two resonance tubes 2 'are connected to one processing vessel 1'.
For these two resonance tubes 2 ', a compressed air supply line 4' having a compressed air reservoir 3a 'is provided from a compressed air source 3'.
In this case, low-frequency sound waves are simultaneously generated in the two resonance tubes 2 'by alternately and intermittently supplying the compressed air sent via the switching means 5'.

The switching means 5 'in the second embodiment is configured as shown in FIG. That is, a hollow valve case 7 'having one end closed by a lid plate 11'.
In the same manner as in the first embodiment, a rotary valve body 8 'rotatably driven at an appropriate speed by a motor 6' or the like is inserted, and the rotary valve body 8 'has bearings at both ends thereof. At 12 'and 13', they are rotatably supported.

One compressed air inlet port 9 'connected to the compressed air generating source 3' is provided in the valve case 7 '.
And two compressed air outlet ports 10 'connected to each of the resonance tubes 2' so that the two compressed air outlet ports 10 'are located on both sides of one compressed air inlet port 9'. Are provided side by side in the axial direction.

On the other hand, inside the rotary valve body 8 ',
A through hole 16 'extending in the axial direction is formed, and the inside of the through hole 16' is configured to always communicate with the compressed air inlet port 9 'via an inlet side opening 17'.

The two compressed air outlet ports 10 'of the rotary valve body 8' are configured to fit closely to the inner peripheral surface 7a 'of the valve case 7'.
Each of these portions is provided with an outlet-side opening 18 'communicating with the through-hole 16', and the opening 18 'is provided only once during one rotation of the rotary valve body 8'. It is configured to communicate with each of the air outlet ports 10 '.

In this case, the openings 18 'are out of phase by 180 degrees along the direction of rotation of the rotary valve 8'.

The portion of the rotary valve element 8 'on the side of the compressed air inlet port 9' is provided with a clearance between the rotary valve element 8 'and the inner peripheral surface 7b' of the valve case 7 '.
It is configured to reduce the rotation resistance at.

A part of the valve case 7 'where the rotary valve 8' protrudes from the valve case 7 'is provided with a sealing means 19' which comes into contact with the outer peripheral surface of the rotating rotary valve 8 '.
Sealing means for disconnecting a portion of the outer periphery of the rotary valve body 8 'between the compressed air inlet port 9' and the two compressed air outlet ports 10 'in a non-communicating manner. 20 'is provided. The two sealing means 20 'have the same configuration as in the first embodiment.

In this configuration, during one rotation of the rotary valve body 8 'in the valve case 7', both outlet side openings 18 'at both ends of the through hole 16' in the valve case 7 'are Only when communicating with the compressed air outlet port 10 ', the compressed air from the compressed air generating source 3' can be supplied to both resonance tubes 2 '. In other words, the compressed air from the compressed air generating source 3' can be supplied. The air is intermittently supplied to the two resonance tubes 2 'by the rotation of the rotary valve 8' in the switching means 5 '.
A low-frequency sound wave can be generated inside.

In this case, the two compressed air outlet ports 1
0 'generates a low-frequency standing wave whose phase is shifted by 180 degrees at the ends of both resonance tubes 2' by shifting the phase by 180 degrees along the rotation direction of the rotary valve body 8 '. Will be done.

Incidentally, also in the second embodiment,
As in the first embodiment, the rotary valve element 8 '
A gap is provided between the two compressed air outlet ports 10 'and the inner peripheral surface 7a' of the valve case 7 ', while the compressed air inlet port 9' of the rotary valve body 8 'is provided.
The side portion is closely fitted to the inner peripheral surface 7b 'of the valve case 7' so that the compressed air inlet port 9 'and the compressed air outlet ports 1 only once during one rotation of the rotary valve body 8'.
0 'may be connected.

Further, by composing the compressed air inlet port 9 'and both compressed air outlet ports 10' several times during one rotation of the rotary valve body 8 ',
The number of rotations of the rotary valve body 8 can be reduced.

Further, the compressed air inlet port 9 '
Is provided in the valve case 7 'instead of the valve case 7'.
May be provided on a lid plate 11 'which closes one end of the cover.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention.

FIG. 2 is a vertical sectional front view of a switching unit according to the first embodiment.

FIG. 3 is an enlarged view of a main part of FIG. 2;

FIG. 4 is a vertical sectional front view showing a modification of the switching means in the first embodiment.

FIG. 5 is a diagram showing a second embodiment of the present invention.

FIG. 6 is a vertical sectional front view of a switching unit according to the second embodiment.

[Explanation of symbols]

 1,1 processing vessel 2,2 'resonance tube 3,3' compressed air source 4 compressed air supply line 5,5 'switching means 6,6' motor 7,7 'valve case 8,8' rotary valve body 9 , 9 'Compressed air inlet port 10, 10' Compressed air outlet port 11, 11 'Cover plate 12, 12' Bearing 13, 13 'Bearing 16, 16' Through hole 17, 17 'Entrance side opening 18, 18' Exit Side opening 20, 20 'Sealing means

Claims (6)

[Claims] A switching means comprising a rotary valve body rotatably driven in a valve case is provided in the middle of an air supply line from a compressed air generation source to at least one resonance pipe. A low-frequency sound wave generator configured to supply compressed air from the compressed air generation source to the resonance tube at least once during one rotation of the valve element. 2. The rotary valve body according to claim 1, wherein a valve case of the switching means includes a compressed air inlet port from the compressed air source and a compressed air outlet port to the resonance pipe. While being provided side by side in the axial direction,
A through hole is provided in the rotary valve body of the switching means so as to communicate the compressed air inlet port with the compressed air outlet port at least once during one rotation of the rotary valve body. A low-frequency sound wave generator, wherein a sealing means for disconnecting between these ports is provided at a portion of the outer periphery of the body between the compressed air inlet port and the compressed air outlet port. 3. The method according to claim 1, wherein the two compressed air outlet ports are provided, and the two compressed air outlet ports are connected to one of the compressed air inlet ports in the axial direction of the rotary valve body. On the other hand, provided inside the rotary valve body of the switching means, a through-hole is provided at least once during one rotation of the rotary valve body so as to communicate the compressed air inlet port with both compressed air outlet ports, Furthermore, in each of the portions of the outer periphery of the rotary valve body between the compressed air inlet port and both compressed air outlet ports,
A low-frequency sound wave generator comprising a sealing means for disconnecting between these ports. 4. The low-frequency sound wave generator according to claim 2, wherein said through-hole is provided inside said rotary valve body. 5. The compressed air outlet port according to claim 3, wherein one phase of the compressed air outlet port communicates with the compressed air inlet port during one revolution of the rotary valve body, and the other compressed air outlet port is connected to the compressed air outlet port. The phase at the time of communication with the inlet port is 18
A low-frequency sound wave generator shifted by 0 degrees. 6. The low-frequency device according to claim 3, wherein said two compressed air outlet ports are disposed on both sides of said one compressed air inlet port. Sound wave generator.