JP2022057906A - Silencer component, silencer, silencing unit, and blower - Google Patents

Abstract

To provide a silencer component, a silencer, a silencing unit and a blower capable of attenuating sound waves in a wide frequency band.SOLUTION: In a blower 5, a silencer component 1 has a hole 11 penetrating in an axial direction and extends in a radial direction which is a direction intersecting a central axis. Further, the silencer component includes a hill portion 13 and a plurality of groove portions 12 that are recessed in one of the axial directions from the hill portion and are arranged around the central axis. The plurality of groove portions are connected to the hole and extend in a direction away from the central axis. A shape of at least one groove is different from shapes of other grooves.SELECTED DRAWING: Figure 5

Description

The present invention relates to a silencer component, a silencer including a silencer component, a silencer unit including a silencer, and a blower device including a silencer.

A noise reduction device used by being attached to a blower motor which is a noise source is known. The noise reduction device includes an acoustic tube and a case. The acoustic tube includes a peripheral wall portion that surrounds a part around the rotor portion of the blower motor having a fan portion and a rotor portion. The case is provided on the outside of the acoustic tube and surrounds the entire perimeter of the blower motor. The peripheral wall portion of the acoustic tube is formed so as to cover more than half of the opening surface which is the sounding surface provided in the rotor portion of the blower motor. Further, in the case, an exhaust opening for discharging air from the fan portion to the outside is provided at a position 180 degrees opposite to the opening surface in the portion facing the peripheral wall portion of the acoustic tube. Thereby, an attempt is made to effectively reduce the noise radiated from the motor with a simple configuration (see JP-A-2006-314595).

Japanese Unexamined Patent Publication No. 2006-314595

A muffler may be attached to the device to attenuate the sound waves emitted by the device. For example, a silencer may be attached to the blower. However, the frequency (wavelength) of the sound wave generated from the device is not one. The frequencies of sound waves generated by equipment vary. There is a problem that the sound wave should be attenuated over a certain frequency band (wavelength region) in order for the sound to be perceived to be quieter. In the noise reducing device described in Patent Document 1, the frequency of sound waves that can be attenuated is limited.

The present invention provides a silencer component, a silencer, a silencer unit, and a blower capable of attenuating sound waves in a wide frequency band.

The exemplary silencer component of the present invention is a silencer component that has a hole penetrating in the axial direction and extends in the radial direction in a direction intersecting the central axis, and is a hill portion and the hill portion to the above. It has a plurality of grooves recessed in one direction in the axial direction and arranged around the central axis. The plurality of grooves are connected to the hole and extend in a direction away from the central axis. The shape of at least one groove is different from the shape of the other groove.

According to the exemplary silencer component of the present invention, sound waves in a wide frequency band can be attenuated.

FIG. 1 is a perspective view showing an example of a blower device according to an embodiment. FIG. 2 is a schematic diagram showing an example of a blower device according to an embodiment. FIG. 3 is an exploded perspective view showing an example of the blower device according to the embodiment. FIG. 4 is a perspective view showing an example of a silencer component according to the embodiment. FIG. 5 is a plan view showing an example of a silencer component according to the embodiment. FIG. 6 is a plan view showing an example of the direction and length in the description of the silencer component according to the embodiment. FIG. 7 is a perspective view showing an example of a state in which the silencer parts according to the embodiment are overlapped. FIG. 8 is a schematic diagram showing an example of a plurality of silencer parts included in the first silencer according to the embodiment. FIG. 9 is a perspective view showing an example of the muffling unit according to the embodiment. FIG. 10 is a cross-sectional perspective view showing an example of the muffling unit according to the embodiment.

Hereinafter, the silencer component 1, the silencer (first silencer 2, the second silencer 3), the silencer unit 4, and the blower 5 according to the embodiment of the present invention will be described with reference to the drawings. The scope of the present invention is not limited to the following embodiments, and can be arbitrarily changed within the scope of the technical idea of the present invention.

In the present specification, the central axis CA is the central axis of the silencer component 1, the first silencer 2, the second silencer 3, the silencer unit 4, and the blower 5. The central axis CA passes through the center of the hole 11 provided in the silencer component 1. In FIGS. 5, 6, and 8, the point of the hole 11 through which the central axis CA passes is indicated by C. The direction parallel to the central axis CA is referred to as "axial direction". The direction orthogonal to the central axis CA is referred to as "diametrical direction". The circumferential direction centered on the central axis CA is simply referred to as "circumferential direction". In the description of the blower device 5, the intake port 71 side of the blower device 5 is referred to as one side, and the exhaust port 72 side is referred to as the other side in the axial direction. In the following description, among the silencers included in the blower 5, the silencer including the silencer component 1 according to the embodiment is referred to as the first silencer 2. Among the silencers included in the blower device 5, the silencer that does not include the silencer component 1 according to the embodiment is referred to as a second silencer 3. Further, in the silencer component 1 and the first silencer 2, the specific example of the expression "the shape is different" includes the case where "the volume is different".

<1. Blower 5>
An exemplary blower device 5 according to an embodiment will be described. 1 to 3 are views showing an example of the blower device 5 according to the embodiment. FIG. 2 is a diagram schematically showing an example of the structure of the blower device 5 according to the embodiment. FIG. 3 shows an example of a state in which the blower device 5 according to the embodiment is disassembled.

The blower device 5 includes a first silencer 2, a blower unit 6, and a sound deadening unit 4. As shown in FIGS. 1 to 3, the first silencer 2 is attached to one side of the blower portion 6 in the axial direction. A muffling unit 4 is attached to the other side of the blower portion 6 in the axial direction. The blower unit 6 includes a fan motor 61. The fan motor 61 is housed in the blower case 62. The fan motor 61 includes a fan (impeller) and a motor for rotating the fan. When the motor rotates, air is sucked into the intake port 71 of the blower device 5. The air passes through the first silencer 2, the blower unit 6, and the silencer unit 4 in this order, and is discharged from the exhaust port 72 of the blower device 5. The thick arrow shown in FIG. 2 shows an example of air flow. The gas (air) flowing from the intake port 71 toward the exhaust port 72 generates sound waves of various frequencies (wavelengths). The first silencer 2 and the silencer unit 4 attenuate the generated sound wave.

For example, the blower 5 can be mounted on a vacuum cleaner. The vacuum cleaner equipped with the blower 5 may be a self-propelled (robot type) vacuum cleaner, a canister type vacuum cleaner, or a handy type vacuum cleaner.

<2. Mute unit 4>
An exemplary muffling unit 4 according to an embodiment will be described with reference to FIGS. 2 and 3. The muffling unit 4 includes a first muffling device 2 and a second muffling device 3. The first silencer 2 provided on the intake port 71 side and the first silencer provided in the silencer unit 4 on the exhaust port 72 side may have the same configuration. The first silencer 2 and the second silencer 3 are housed in the silencer unit case 41. 2 and 3 show an example in which the second silencer 3 is arranged on one side in the axial direction and the first silencer 2 is arranged on the other side in the axial direction. The first silencer 2 may be arranged on one side in the axial direction of the second silencer 3. The second silencer 3 may be arranged on the other side of the first silencer 2 in the axial direction.

<3. 1st silencer 2>
An exemplary first silencer 2 according to an embodiment will be described with reference to FIGS. 1 to 3. The first silencer 2 includes a silencer component 1. FIG. 3 shows an example in which the first silencer 2 includes a plurality of silencer components 1. The silencer component 1 included in the first silencer 2 may be one. The silencer component 1 of the first silencer 2 arranged on the intake port side is housed in the silencer case 10. The silencer component 1 of the first silencer arranged in the silencer unit 4 is housed in the silencer unit case 41. When there are a plurality of silencer parts 1, the plurality of silencer parts 1 are stacked in the axial direction. When there are a plurality of silencer components 1, there are a plurality of layers of the silencer components 1 in the first silencer 2.

<4. Mute parts 1>
An exemplary silencer component 1 according to an embodiment will be described with reference to FIGS. 4 to 6. 4 and 5 are views showing an example of the silencer component 1 according to the embodiment. FIG. 6 is a diagram illustrating a direction and a length of the silencer component 1 according to the embodiment.

The silencer component 1 includes a hole 11 penetrating in the axial direction of the central axis CA. The silencer component 1 spreads in the radial direction, which is the direction intersecting the central axis CA. As shown in FIGS. 4 to 6, the hole 11 may be a circle when viewed from the axial direction. In the examples shown in FIGS. 5 and 6, C is also the center of the hole 11 seen from the axial direction. The shape of the hole 11 seen from the axial direction is not limited to a circle. For example, the shape of the hole 11 seen from the axial direction may be an ellipse, a rectangle, or a polygon. As shown in FIGS. 4 to 6, the silencer component 1 is a disk extending in the radial direction (annular). The shape of the silencer component 1 is not limited to the disk.

The silencer component 1 includes a groove portion 12 and a hill portion 13. The groove portion 12 is recessed in one axial direction from the hill portion 13. A plurality of groove portions 12 are arranged around the central axis CA. A groove portion 12 is provided on one of the surfaces (front surface or back surface) of the silencer component 1 when viewed from the axial direction. The groove portion 12 is a part of the muffling chamber of the first muffling device 2. The anechoic chamber is the Helmholtz resonance chamber. The wall surface of the groove portion 12 becomes a part of the wall surface of the sound deadening chamber. The hill portion 13 is a portion of the surface of the silencer component 1 where the groove portion 12 is provided, which is not the groove portion 12.

Since the groove portion 12 is used as a part of the muffling chamber, a lid portion is overlapped with the groove portion 12. The lid portion is a member that covers the groove portion 12. The lid portion is a member of the groove portion 12 that closes the opening portion in the axial direction. By being covered with the lid portion, the groove portion 12 becomes a sound deadening chamber. Another silencer component 1 can be used for the lid portion. In this case, of the surfaces of the silencer component 1, the back side of the surface provided with the groove portion 12 is a flat surface. The flat surface of another silencer component 1 is superposed on the groove portion 12 of one silencer component 1. A plate covering the groove portion 12 may be used as the lid portion instead of the silencer component 1. The surface of the lid portion overlapped with the groove portion 12 does not have to be a flat surface. The surface of the lid portion to be overlapped with the groove portion 12 may have a shape that covers the groove portion 12 and allows the groove portion 12 to be used as a sound deadening chamber.

The plurality of grooves 12 are connected to the holes 11. The plurality of groove portions 12 extend in a direction away from the central axis CA (diameter direction). The shape of at least one groove 12 is different from the shape of the other grooves 12. Here, Helmholtz resonance is a phenomenon in which the air in a partially opened container becomes a spring and resonates (resonates). Let V be the internal volume of the anechoic chamber, S be the opening area of the anechoic chamber (cross-sectional area of the opening), L be the length of the neck of the anechoic chamber (the pipe portion at the entrance), and c be the speed of sound. The following equation shows an example of the equation for obtaining the resonance frequency (natural angular frequency) ω0.

(Equation) ω0 = c × (S / VL) ^1/2

Resonance causes vibration. Vibration converts the energy of sound waves into heat energy. By arranging the muffling chamber, the sound wave generated by the blower 5 can be attenuated. As shown in the above equation, if one of the three parameters V, S, and L is different, the resonance frequency changes.

That is, if the shape of the groove portion 12 is different, the shape and internal volume of the muffling chamber will change. As can be seen from the above equation, the internal volume of the muffling chamber can be changed, for example, by changing the shape of the groove portion 12. As a result, the resonance frequency can be made different due to the difference in the shape of the groove portion 12. In the silencer component 1, the shape of at least one groove portion 12 is different from the shape of the other groove portions 12. By making the shape of the groove portion 12 different, the volumes of one groove portion 12 and another groove portion 12 can be made different. When the groove portion 12 is covered with the lid portion, the internal volume and shape of one sound deadening chamber and another sound deadening chamber can be different. That is, the resonance frequency of the muffling chamber can be shifted by changing the shape of the groove portion 12. This makes it possible to attenuate sound waves of a plurality of frequencies. Therefore, sound waves in a certain frequency range can be attenuated.

In one silencer component 1, the shape of each groove 12 may be different. Since the shapes of all the groove portions 12 are different, the resonance frequency can be shifted for each groove portion 12. That is, when the groove portion 12 is covered with the lid portion, the resonance frequencies of all the muffling chambers can be shifted. Therefore, sound waves having a plurality of frequencies can be attenuated. Therefore, sound waves in a certain frequency range can be attenuated.

<4.1 Tubular part 14 and enlarged part 15>
Each groove 12 includes a tubular portion 14 and an enlarged portion 15. The tubular portion 14 is connected to the hole 11. The tubular portion 14 is a region extending in a direction (diametrical direction) away from the central axis CA. The enlarged portion 15 is a region extending in a direction intersecting the radial direction from the radial outer end of the tubular portion 14. The tubular portion 14 is the so-called neck of the anechoic chamber (Helmholtz resonance chamber). In the example of FIGS. 4 to 6, the tubular portion 14 passes through C and extends in the direction of a straight line intersecting the central axis CA. The broken line in FIG. 6 indicates the radial direction. The alternate long and short dash line in FIG. 6 indicates a direction that intersects the radial direction. The groove 12 attenuates the sound wave. The cross-sectional area of the tubular portion 14 and the enlarged portion 15, the length in the radial direction, and the length in the intersecting direction can be adjusted. It is also possible to adjust the volume of the muffling chamber. Therefore, the sound wave of a desired frequency can be attenuated. The cross-sectional area of the tubular portion 14 and the enlarged portion 15 is the area of the cross section of the tubular portion 14 and the enlarged portion 15 cut along a plane parallel to the axial direction.

In the region F1 where each tubular portion 14 and the hole 11 are connected in a plane parallel to the central axis CA, the area of the plane parallel to the central axis CA of at least one tubular portion 14 is the center of the other tubular portion 14. The plane and area parallel to the axis CA may be different. The area of the surface parallel to the central axis CA in the region F1 where the groove portion 12 and the hole 11 are connected means the opening area of the sound deadening chamber formed by covering the groove portion 12 with the lid portion. As mentioned above, the resonance frequency is affected by the opening area of the anechoic chamber. By making the area of the plane parallel to the central axis CA different, the resonance frequency of one groove portion 12 and another groove portion 12 can be shifted. When the groove portion 12 is covered with the lid portion, the opening area of the muffling chamber can be made different. That is, by making the area of the surface parallel to the central axis CA of the groove portion 12 different, the resonance frequency of one anechoic chamber and the resonance frequency of another anechoic chamber can be shifted. Therefore, sound waves having a plurality of frequencies can be attenuated. That is, sound waves in a certain frequency range can be attenuated.

Circumferential centers in the region F1 where each tubular portion 14 and the hole 11 are connected are arranged at equal intervals around the central axis CA. That is, in the region F1 where each tubular portion 14 and the hole 11 are connected, the centers in the direction intersecting the radial direction may be arranged at equal intervals around the central axis CA. It can be said that the center in the direction intersecting the radial direction is the center of the opening area (cross section of the opening) of the sound deadening chamber formed by covering the groove 12 with the lid. As a result, the tubular portions 14 can be arranged at equal intervals, so that the sound waves enter the groove portions 12 and the sound deadening chamber evenly. That is, the groove portion 12 into which the sound wave enters and the muffling chamber are not biased. As a result, all the grooves 12 and the muffling chamber can be fully functioned. The effect of muffling can be enhanced.

In a tube length that is the length from the region F1 where the tubular portion 14 and the hole 11 connect to the radial outer end of the tubular portion 14, the tube length of at least one tubular portion 14 is the same as the tube length of the other tubular portion 14. It may be different. The pipe length is the length of the tubular portion 14 in the direction away from the central axis CA. In other words, in the radial direction, the length of at least one tubular portion 14 in the direction away from the central axis CA may be different from the length of the other tubular portion 14 in the direction away from the central axis CA. In FIG. 6, an example of the pipe length is illustrated by W1.

As mentioned above, the resonance frequency of the anechoic chamber is affected by the anechoic chamber. By making the length (tube length) of the tubular portion 14 in the direction away from the central axis CA different, the resonance frequency of one groove portion 12 and another groove portion 12 can be shifted. That is, when the groove portion 12 is covered with the lid portion, the lengths of the pipe lengths of one sound deadening chamber and another sound deadening chamber can be made different. Therefore, the resonance frequency of one anechoic chamber and the resonance frequency of another anechoic chamber can be shifted. Sound waves of multiple frequencies can be attenuated. Sound waves in a certain frequency range can be attenuated.

The length in the direction intersecting the radial direction in at least one enlarged portion 15 may be different from the length in the direction intersecting the radial direction in the other enlarged portion 15. For example, the direction intersecting the radial direction is the circumferential direction of the central axis. In FIG. 6, W2 shows an example of the length of the enlarged portion 15 in the direction intersecting the radial direction. W2 indicates the length of the arc in the circumferential direction of the enlarged portion 15. As shown in FIG. 6, the length of the enlarged portion 15 in the direction intersecting the radial direction may be different at the outermost position in the radial direction (the end of the groove portion 12).

As a result, the sizes of one enlarged portion 15 and another enlarged portion 15 can be shifted. That is, when the groove portion 12 is covered with the lid portion, the internal volumes of one sound deadening chamber and another sound deadening chamber can be made different. Therefore, the resonance frequency of one anechoic chamber and the resonance frequency of another anechoic chamber can be shifted. That is, sound waves having a plurality of frequencies can be attenuated. Sound waves in a certain frequency range can be attenuated.

As shown in FIGS. 5 and 6, at least one enlarged portion 15 may overlap with the other enlarged portion 15 in the radial direction. In the example of FIG. 5, all the enlarged portions 15 are radially overlapped with the other enlarged portions 15. As a result, a plurality of groove portions 12 can be efficiently arranged in the silencer component 1. Therefore, the size of the silencer component 1 can be suppressed. In other words, as many grooves 12 as possible can be provided in the silencer component 1. Therefore, it is possible to provide a silencer component 1 that can attenuate sound waves of various frequencies while being compact.

<5. Superposition of silencer parts 1>
Next, an example of superimposing the muffler component 1 in the first muffler 2 according to the embodiment will be described with reference to FIGS. 7 and 8. FIG. 7 is a diagram showing an example of a state in which the silencer parts 1 according to the embodiment are overlapped. FIG. 8 is a diagram showing an example of a plurality of silencer parts 1 included in the first silencer 2 according to the embodiment.

As shown in FIG. 7, a plurality of silencer parts 1 are stacked in the axial direction. Since the silencer parts 1 are stacked, the number of groove portions 12 and silencer chambers provided in the first silencer 2 can be increased. Therefore, the sound wave can be sufficiently attenuated. Moreover, the muffler provided with many grooves 12 and muffling chambers can be miniaturized. By making the resonance frequencies of the groove portion 12 and the anechoic chamber different, the sound wave can be attenuated in a wide frequency range.

In at least one silencer component 1, the groove 12 is provided on one surface of the silencer component 1 in the axial direction. The other surface of the silencer component 1 in the axial direction is a flat surface. One surface of the silencer component 1 provided with the groove portion 12 and the other surface of the silencer component 1 arranged on one surface side of the silencer component 1 provided with the groove portion 12 are overlapped with each other. That is, the other surface (flat surface) of the other silencer component 1 can be overlapped with the groove portion 12 of the silencer component 1. As a result, the opening of the groove portion 12 can be closed. The closed groove portion 12 serves as a muffling chamber. Therefore, the silencer component 1 can be used as a lid.

In the example of FIG. 7, among the silencer parts 1, the silencer component 1 other than the silencer component 1 on the innermost side of the paper in FIG. 7 uses the other silencer component 1 as a lid. Of the muffler parts 1, the groove 12 of the muffler part 1 on the innermost side of the paper in FIG. 7 cannot be covered with another muffler part 1. Therefore, a mating plate 16 is superposed on the silencer component 1 on the innermost side of the paper surface in FIG. 7 as a lid portion. The mating plate 16 is provided with a hole portion that overlaps with the hole 11 of the silencer component 1. Seen from the axial direction, the size of the hole portion of the mating plate 16 is the same as the size of the hole 11 of the silencer component 1. Further, the contour of the silencer component 1 and the contour of the mating plate 16 as viewed from the axial direction are the same.

When n silencer parts 1 are stacked, all the silencer parts 1 may be provided with a groove portion 12 on one surface in the axial direction and the other surface in the axial direction may be a flat surface. When overlapping, the groove portion 12 of one silencer component 1 and the flat surface of the other silencer component 1 face each other. (N-1) The groove portion 12 of the silencer component 1 is covered with the flat surface of the other silencer component 1. A mating plate 16 is superposed on one silencer component 1.

The other surface of the silencer component 1 in the axial direction does not have to be a flat surface. Grooves 12 may be provided on both sides of the silencer component 1 in the axial direction. For example, on the silencer component 1 provided with grooves 12 on both sides in the axial direction, a flat surface in the axial direction of another silencer component 1 or a mating plate 16 is overlapped. Further, a groove portion 12 is formed on one surface of the silencer component 1 in the axial direction, and the groove portion 12 is formed on the other surface of the other silencer component 1 arranged on the axial direction side of the silencer component 1. It is formed, and the groove portions 12 may be overlapped with each other to form a muffling chamber.

The groove portion 12 of the silencer component 1 may face one side in the axial direction (the intake port 71 side of the blower device 5). Further, the groove portion 12 of the silencer component 1 may face the other side in the axial direction (the exhaust port 72 side of the blower device 5). The orientation of the groove 12 does not matter.

FIG. 7 shows an example in which three silencer parts 1 are stacked. The number of sheets to be stacked may be 4 or more, or 2 or more. When stacking the silencer parts 1, the holes 11 are stacked in the axial direction. In the example of FIG. 7, each silencer component 1 has the same shape. Since the shape is the same, in each silencer component 1, the size of the hole 11 seen from the axial direction, the contour of the silencer component 1 seen from the axial direction, the thickness in the axial direction, and the shape of each groove portion 12 are the same. By having the same shape, the silencer parts 1 can be stacked without any deviation.

The shape of the groove 12 may be different in each silencer component 1. For example, in each silencer component 1, the shapes other than the groove portion 12 may be the same, and the shapes of the groove portions 12 may be different from each other.

A plurality of silencer parts 1 are stacked in the axial direction. As described above, each silencer component 1 may have the same shape. When n silencer parts 1 are stacked, each silencer component 1 may be stacked with an angle of 360 / n degrees around the central axis CA. For example, when four silencer parts 1 are stacked, the angle of the silencer component 1 is shifted by 90 degrees. The openings (sound wave inlets) of the groove portions 12 can be evenly arranged in the circumferential direction of the holes 11. Therefore, the openings of the groove portions 12 can be provided at positions where the muffling effect is enhanced. This makes it possible to enhance the muffling effect of the muffler.

For example, each silencer component 1 is provided with at least one groove portion 12 having the same shape. The silencer component 1 is stacked so that the groove portion 12 having the same shape is displaced by an angle of 360 / n degrees around the central axis CA.

FIG. 8 shows an example in which the silencer parts 1 having the same shape are overlapped by shifting them by 90 degrees. In FIG. 8, the stacking order is indicated by arrows. The silencer component 1 may be stacked so as to be offset by an angle of 360 / n degrees in the clockwise direction of the central axis CA. Further, the silencer component 1 may be stacked so as to be offset by an angle of 360 / n degrees in the counterclockwise direction of the central axis CA.

As shown in FIG. 8, each silencer component 1 may be provided with a notch 17 at the radial outer edge. The cutout portion 17 penetrates in the axial direction. When viewed from the axial direction, the positions of the notch portions 17 are aligned, and the silencer parts 1 are overlapped with each other. When the notch portions 17 are overlapped at the same position, the notch portions 17 are provided at positions where the silencer parts 1 are displaced by an angle of 360 / n degrees around the central axis CA. That is, when the silencer component 1 is arranged so as to be displaced by an angle of 360 / n degrees around the central axis CA, the notch portion 17 of each silencer component 1 is displaced by an angle of 360 / n degrees around the central axis CA. It is provided at the position.

When the silencer component 1 is shifted by an angle of 360 / n degrees, if the notch portion 17 is provided, the silencer component 1 does not have exactly the same shape. When the cutout portion 17 is provided and is shifted by an angle of 360 / n degrees, the shape of each silencer component 1 may be the same except for the cutout portion 17.

The blower 5 includes a first silencer 2. The noise generated by the operation of the blower 5 can be attenuated. Even if a plurality of silencer parts 1 are stacked, the size of the first silencer 2 is small. The size of the first silencer 2 attached to the blower 5 can be suppressed. Therefore, it is possible to provide a compact blower device 5 with a silencer.

<6. 2nd silencer 3>
Next, an exemplary second silencer 3 according to the embodiment will be described with reference to FIGS. 9 and 10. FIG. 9 is a diagram showing an example of the muffling unit 4 seen from the exhaust port 72 side according to the embodiment. The muffling unit 4 shown in FIG. 9 has a first muffling device 2 and a second muffling device 3 built-in. FIG. 10 is a diagram showing an example of the muffling unit 4 according to the embodiment. FIG. 10 shows a state in which the muffling unit 4 is cut in a plane parallel to the radial direction through the central axis CA. FIG. 10 shows a cross section and an internal structure of the second silencer 3 and the first silencer 2.

As shown in FIG. 10, the silencer unit 4 includes a first silencer 2 and a second silencer 3 (another silencer) arranged on one side of the first silencer 2 in the axial direction. In the muffling unit 4, the second muffling device 3 is arranged on the intake port 71 side of the blower device 5. The first silencer 2 is arranged on the other side in the axial direction (the exhaust port 72 side of the blower device 5). In addition, in the silencer component 1 of the first silencer 2 built in the silencer unit 4 and the first silencer 2 attached to the intake port 71 side of the air blower 6, the shape of the groove portion 12 of the silencer component 1 is different. It may be the same or different.

Inside the second silencer 3, a passage 31 connected to the hole 11 of the silencer component 1 of the first silencer 2 is provided. As shown in FIG. 10, the passage 31 extends axially. The sound wave passes through the passage 31 and reaches the first silencer 2. The first silencer 2 of the silencer unit 4 attenuates the reached sound wave.

The second silencer 3 (another silencer) includes a plurality of plate-shaped portions 32 arranged in the axial direction. The area of the surface intersecting the axial direction of the plate-shaped portion 32 is different. Each plate-shaped portion 32 is circular (annular) when viewed from the axial direction. A gap is provided between the plate-shaped portion 32 and the plate-shaped portion 32. This gap becomes a branch pipe. The sound wave is attenuated by the interference of the sound wave that branches into the branch pipe and is reflected by the branch pipe.

The second silencer 3 attenuates sound waves in a higher frequency band than the first silencer 2. The first silencer 2 attenuates sound waves in a frequency band lower than that of the second silencer 3. By combining the first silencer 2 and the second silencer 3, sound waves in a wider frequency band can be reduced.

It is not impossible for the second silencer 3 to attenuate low frequency sound waves. However, when attenuating low-frequency sound waves, it is necessary to increase the radial radius of the plate-shaped portion 32. Therefore, the size of the second silencer 3 and the silencer unit 4 becomes large. That is, the combined use of the first silencer 2 and the second silencer 3 also contributes to the miniaturization of the silencer unit 4 and the blower device 5.

In the blower device 5, the first silencer 2 is arranged on the intake port 71 side, and the silencer unit 4 is arranged on the exhaust port 72 side. The silencer unit includes a first silencer 2 and another silencer (second silencer 3). The second silencer 3 (another silencer) includes a plurality of plate-shaped portions 32 arranged in the axial direction. The area of the surface intersecting the axial direction of the plate-shaped portion 32 is different. That is, the first silencer 2 of the intake port 71, the first silencer 2 of the second stage, and the second silencer 3 are combined. As a result, the sound wave generated by the operation of the blower 5 can be greatly attenuated. Moreover, the axial sizes of the first silencer 2 and the second silencer 3 are suppressed. It is possible to provide a compact and low noise blower unit.

Although the embodiments and modifications of the present invention have been described above, the configurations and combinations thereof in the embodiments are examples, and the configurations are added, omitted, replaced, and the like without departing from the spirit of the present invention. Other changes are possible. Further, the present invention is not limited to the embodiments.

The silencer component of the present invention can be used, for example, in a silencer. The silencer can be used in the blower.

1 Silent parts 10 Silent case 11 Hole 12 Groove 13 Hill 14 Tubular 15 Enlarged 16 Laminated plate 17 Notch 2 1st silencer (silencer)
3 2nd silencer 31 Passage 32 Plate-shaped part 4 Sound deadening unit 41 Sound deadening unit case 5 Blower 6 Blower 61 Fan motor 62 Blower case 71 Blower case 71 Intake port 72 Exhaust port CA Central axis F1 area

Claims (14)

A muffler component that has a hole that penetrates in the axial direction of the central axis and spreads in the radial direction that intersects the central axis.
Hill and
A plurality of grooves that are recessed in one of the axial directions from the hill and are arranged around the central axis.
Have,
The plurality of grooves are connected to the hole and extend in a direction away from the central axis.
A silencer component in which the shape of at least one groove is different from the shape of the other groove. The silencer component according to claim 1, wherein the shapes of the respective grooves are all different. Each said groove comprises a tubular portion and an enlarged portion.
The tubular portion is a region connected to the hole and extending in a direction away from the central axis.
The silencer component according to claim 1 or 2, wherein the enlarged portion is a region extending from the radial outer end of the tubular portion in a direction intersecting the radial direction. In the region where each tubular portion and the hole are connected in a plane parallel to the central axis.
The silencer component according to claim 3, wherein the area of the surface parallel to the central axis of the at least one tubular portion is different from the area parallel to the surface parallel to the central axis of the other tubular portion. In the pipe length, which is the length from the region where the tubular portion and the hole are connected to the radial outer end of the tubular portion.
The silencer component according to claim 3, wherein the tube length of at least one tubular portion is different from the tube length of the other tubular portion. The silencer component according to any one of claims 3 to 5, wherein the length in the direction intersecting the radial direction in the at least one enlarged portion is different from the length in the direction intersecting the radial direction in the other enlarged portion. .. The silencer component according to any one of claims 3 to 6, wherein the center in the circumferential direction in the region where the tubular portion and the hole are connected is arranged at equal intervals around the central axis. The silencer component according to any one of claims 3 to 7, wherein the at least one enlarged portion overlaps the other enlarged portion in the radial direction. A silencer in which a plurality of silencer parts according to any one of claims 1 to 8 are stacked in the axial direction. A plurality of silencer parts according to any one of claims 1 to 8 are stacked in the axial direction.
Each of the silencer parts has the same shape.
When n pieces of the muffler parts are stacked, each of the muffler parts is a muffler that is shifted by an angle of 360 / n degrees around the central axis. In the at least one silencer component, the groove is provided on one axially oriented surface of the silencer component.
The other surface of the silencer component in the axial direction is a flat surface.
19. Silencer. The silencer according to any one of claims 9 to 11 and another silencer arranged on one side of the silencer in the axial direction are provided.
The other silencer comprises a plurality of plate-like portions arranged in the axial direction.
A sound deadening unit in which the area of the surface of the plate-shaped portion intersecting the axial direction is different. A blower comprising the silencer according to any one of claims 9 to 11. The silencer according to any one of claims 9 to 11 is arranged on the intake port side.
The muffling unit is located on the exhaust port side,
The silencer unit includes the silencer according to any one of claims 9 to 11 and another silencer.
The other silencer comprises a plurality of plate-like portions arranged in the axial direction.
The area of the surface of the plate-shaped portion that intersects the axial direction is different from that of the blower.

Images