JP2902355B2 - Intake silencer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a compressor,
The present invention relates to an intake silencer used for a machine having an intake unit such as a blower and an internal combustion engine.

[0002]

2. Description of the Related Art In some cases, a silencer for air intake is provided at the air intake section of the above-mentioned machinery, which has a filter function for preventing dust from being sucked and a silencing function for preventing leakage of machine operation noise. For example, the intake silencer described in Japanese Utility Model Publication No. Hei 3-13593 shown in FIGS. 9 and 10 has an intake port 60 at the center and a plurality of large and small circumferential walls 61 having a concentric relationship around the intake port 60. A disk body 62 and a main body 67 having an exhaust port 63 at the center and a filter section 65 and an expansion chamber 66 provided therearound are connected to each other via a communication port 68 near the outer periphery. is there.

[0003] Since each adjacent circumferential wall 61 is divided at a position where adjacent ones are displaced by half a circle, a portion in the disk body 62 is provided between the respective walls in the positive direction along the circumferential direction. A labyrinth-shaped air flow path 70 is formed so as to go from the center toward the outer circumference while repeating branching and merging in the opposite direction. Needless to say, the noise due to the mechanical operation noise is generated from the exhaust port 63 through the filter section 65,
The light propagates through the expansion chamber 66 and the maze air path 70 to the intake port 60.

Therefore, in this intake silencer, high-frequency noise is attenuated by the flow channel expanding / contracting structure formed by the expansion chamber 66 and the other portions, and low-frequency noise is reduced by the maze-type air flow channel 70 having a longer structure. The noise is attenuated so that noise in almost the entire area can be suppressed or eliminated.

[0005]

In the above-mentioned intake silencer, the air flow sucked into the disk body 62 from the intake port 60 repeats the branch flow and the merge flow many times while flowing through the maze type air flow path 70. Therefore, the pipeline resistance as a whole is very large. Therefore, the intake efficiency is adversely affected, and in order to compensate for this, it is necessary to increase the size of the disk body 62 in the radial direction and the thickness direction.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it has been made possible to suppress or eliminate noise in the entire range of high and low frequencies, and to prevent an increase in size and a complicated structure. It is intended to provide an intake silencer.

[0007]

According to the present invention, the following technical measures have been taken in order to achieve the above object. That is, in the present invention according to claim 1, an intake silencer provided with a filter portion in a main body case having an intake port and an exhaust port, wherein the main body case has a central portion communicating with the exhaust port, A first half having a passage partition wall that forms a continuous spiral passage in which air circulates from an outer periphery to a center; and a first half that can be combined with and disassembled with the first half, and has an outer periphery of the spiral passage. A second half provided with the intake port corresponding to the deviated portion, wherein the spiral passage has a second axial direction.
The filter portion is arranged so as to open the half body side and close the opening, and between the filter portion and the air inlet, air flows from the air inlet to a portion of the filter portion corresponding to the outer peripheral side of the spiral passage. The expansion chamber formed as described above is provided.

[0008] In such a continuous spiral path, the air flow flowing through the spiral path does not split or merge.
Therefore, it is possible to increase the length of the air flow path while keeping the pipe resistance low. For this reason, it is possible to mitigate low-frequency noise without having to increase the size of the entire device. In addition, the air flow sucked from the air inlet passes through the filter unit to remove dust, and then flows into the spiral passage. As a result, the rectifying action of the filter section causes the turbulent flow to be less likely to occur in the spiral passage, and as a result,
There is an advantage that it is useful in suppressing pipeline resistance.

On the other hand, the noise from the machinery side, on the contrary to the air flow, firstly, low-frequency noise is eliminated by the spiral passage, and then high-frequency noise is eliminated by the expansion chamber. For this reason, there is an advantage that noise having a low frequency, which is easily propagated as vibration and which is generally difficult to erase, has a wider opportunity to attenuate the noise, and as a result, the noise hardly leaks out.

In the invention according to the second aspect of the present invention, a continuous spiral passage in which a central portion communicates with an exhaust port and air circulates from an outer periphery to a central portion in a main body case having an intake port and an exhaust port. Is formed, and a cylindrical filter portion is provided so as to surround the outer peripheral side of the passage partition wall. Further, in the invention according to claim 3 of the present application,
In a main body case having an intake port and an exhaust port, a central portion communicates with the intake port, a first spiral passage through which air flows from the center side to the outer peripheral side, and a central portion communicates with the exhaust port, and air flows. A second spiral passage that flows from the outer peripheral side to the central side,
Between the first spiral passage and the second spiral passage,
A partition plate is interposed, and a communication hole is formed in the partition plate to allow the outer peripheral side of the first spiral passage to communicate with the outer peripheral side of the second spiral passage.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show a first embodiment of an intake silencer 1 according to the present invention. The intake silencer 1 includes a passage partition wall 3 and a filter inside a main body case 2 having a short cylindrical shape. The part 4 is provided.

The main body case 2 has a half body 8 in which a plurality of air inlets 7 are formed near an outer periphery of a surface on one end side of the short cylinder.
And a half body 11 in which an exhaust port 10 is formed in the short cylinder by a mounting pipe 9 protruding from the center of a surface on the other end side. The halves 8 and 11 can be connected and disassembled with each other by a plurality of hooks 12 provided on their outer peripheral surfaces. The attachment pipe 9 is used to connect directly to machinery (not shown) or indirectly via an appropriate connection pipe (not shown). Therefore, in the following, for convenience of description, the half 11 including the mounting pipe 9 is referred to as an “attachment-side half”, and the other half 8 is referred to as an “attachment-side half”.

The passage partition wall 3 is formed integrally with the mounting half 11. The passage partition wall 3 is formed so as to maintain a predetermined space between adjacent wall portions while drawing a smooth spiral without a break. Therefore, a continuous spiral passage 15 is formed between the wall portions.
The center of the spiral passage 15 communicates with the exhaust port 10. Further, in a state where the attachment side half 8 and the attachment side half 11 are combined, the portion of the spiral passage 15 near the outer periphery is
It corresponds to each intake port 7 of the attached half 8.

The integrally formed body of the mounting half 11 and the passage partition wall 3 can be made of a casting (metal) or a heat-resistant resin material. Further, depending on the machinery to be mounted, it may be formed of other resin materials, rubber, or the like. The filter unit 4 includes an inner surface of the attached half 8,
The passage partition wall 3 is formed in a disk shape so as to fill the space between the partition wall 3 and the protruding wall. In the illustrated example, the filter material 4a is
Although it shows what was formed into a predetermined shape by sandwiching it in a sandwich shape, adoption of such a structure and what to use as the filter material 4a can be changed as appropriate.

The attached half 8 is formed by press-molding a sheet metal material, and the intake port 7 has a structure in which the entire periphery of the opening edge is turned inward. For this reason, the inside diameter of the intake port 7 at the back of the folded portion (between the filter portion 4) is larger than the inside diameter of the opening edge portion,
An expansion chamber 17 is formed by the large diameter portion. A sound absorbing material 18 is adhered to the inner surface of the attached half 8. For this reason, the sound absorbing material 18 allows the space between the inner surface of the attached half 8 and the filter portion 4 and the filter portion 4.
In each gap between the passage partition wall 3 and the wall protruding end, air leakage can be prevented from occurring, and the silencing effect can be improved.

The intake silencer 1 having such a configuration
Is used in a state in which the mounting pipe 9 is connected to machinery (not shown). The suction on the machinery side causes the air to pass through the expansion chamber 17 and the filter unit 4 through the suction port 7 and further swirl. The passage 15 is circulated from the outer peripheral side to the center, and
There is an airflow towards zero. Therefore, the dust contained in the air flow is removed by the filter unit 4 and the filter unit 4 receives a rectifying action, thereby suppressing the generation of a turbulent flow in the spiral passage 15. In addition, noise such as mechanical operation noise generated on the machinery side is generated in the spiral passage 1
5 eliminates low frequency components and then expands the expansion chamber 1
7 allows high frequency components to be erased.
Therefore, in the vicinity of the intake port 7, noise over the entire range of high and low frequencies is suppressed or eliminated.

FIG. 4 shows a second embodiment of the intake silencer 1 according to the present invention. The second embodiment differs from the first embodiment in four points in total. The first
The point is that the intake port 7 is provided for the mounting-side half body 11. The second point is that the passage partition wall 3 is provided for the attached side half 8. A third point is that the filter portion 4 is formed in a cylindrical shape so as to surround the outer peripheral side of the passage partition wall 3 (that is, the spiral passage 15). The fourth point is that, in accordance with the difference structure of the third point, the expansion chamber 1
7 is also formed on the outer peripheral side of the filter section 4.

The operation and effect of the second embodiment are substantially the same as those of the first embodiment, and those having the same functions are denoted by the same reference numerals, and detailed description thereof will be omitted. FIG.
And FIG. 6 shows a third example of the intake silencer 1 according to the present invention.
In the third embodiment, the passage partition wall 3 is provided on both the attachment-side half 8 and the attachment-side half 11, and a partition plate 21 is interposed therebetween. ing. Therefore, the spiral passage 15 is provided with the first spiral passage 15a.
And two of the second spiral passages 15b are provided in tandem.

In the third embodiment, the attached half 8
Is provided with an intake port 7 at the center thereof, and the inside of the intake port 7 is an expansion chamber 17. A cylindrical filter portion 4 is provided so as to surround the expansion chamber 17, and the first spiral passage 15a is further provided on the outer peripheral side.
Is provided. A communication port 22 is formed in the partition plate 21 at an appropriate position on the outer peripheral portion (in the drawing, at four equally-divided positions).

For this reason, the air flow sucked into the intake port 7 flows through the first spiral passage 15a from the center side to the outer peripheral side after passing through the filter section 4, and from there, the communication port of the partition plate 21. 22, flows through the second spiral passage 15 b from the outer peripheral side to the center, and goes to the exhaust port 10.
It turns out that. The noise canceling action of the third embodiment is substantially the same as that of the first embodiment.

FIG. 7 shows a fourth embodiment of the intake silencer 1 according to the present invention. In the fourth embodiment, the passage partition wall 3 is different from the first embodiment in that the main body case 2 ( The only difference is that they are formed separately and independently from the mounting side half 11) and incorporated into the case. The passage partition wall 3 is formed by a sintered metal or the like so as to be porous.

Therefore, in the fourth embodiment, it is possible to expect the absorption of high-frequency noise while passing through the spiral passage 15, and the intake silencer 1 as a whole
The noise reduction effect is high. FIG. 8 shows an intake silencer according to a comparative example having a simple structure in which only a cylindrical filter portion 4 is provided in the main body case 2, and reference numeral 26 denotes an intake pipe. The inside of the intake pipe 26 is used as the intake port 7, but is provided with a distance so that noise with a low frequency can be reduced as much as possible.

On the other hand, the first embodiment (FIGS. 1 to 3)
In the intake silencer 1), the spiral passage 1
The number of windings of No. 5 was set to 4.50 and the number of windings was set to 6.25, and these and the comparative example were connected to the same machine to measure the noise at the intake port 7. A comparison experiment was conducted in which the air flow rate at the exhaust port 10 was measured. As a result, regarding the noise, in the intake silencer 1 in which the spiral passage 15 has 6.25 turns, the noise is 10 dB or more.
The noise suppression effect of 9 dB or more was confirmed even with the intake silencer 1 having 4.50 windings 5.

As for the air flow rate, the spiral passage 1
Regardless of whether the number 5 is 6.25 volumes or 4.50 volumes, any of the intake silencers 1 could observe a value equivalent to that of the comparative example. That is, the deterioration of the pipeline resistance due to the provision of the spiral passage 15 was not recognized. The present invention can be modified in various ways other than the above embodiments.

For example, the shape of the main body case 2 and the disassembly / coupling structure are not limited at all.

[0026]

According to the present invention, a passage partition wall is provided in a main body case having an intake port and an exhaust port by a continuous spiral path from the intake port to the exhaust port, so that the air flow flowing through the spiral path is divided. Therefore, it is possible to increase the length of the air flow path while keeping the pipeline resistance small. For this reason, it is possible to form a compact and to mitigate low frequency noise. Needless to say, there is no fear that the operating capability of the machinery to be attached is reduced due to insufficient intake.

Further, the air flow is subjected to a rectifying action by the filter section before flowing into the spiral passage, and the turbulent flow can be suppressed. Therefore, the air flow is more effective in suppressing the pipe resistance. On the other hand, among the noises from the machinery side, noise having a low frequency, which is easily transmitted as vibration and is generally difficult to eliminate, is first eliminated by the spiral passage. When high frequency noise is eliminated in the expansion chamber, it also spreads. Therefore, low frequency noise can be further suppressed.

[Brief description of the drawings]

FIG. 1 is a sectional view corresponding to line BB in FIG. 2;

FIG. 2 is a side sectional view showing a first embodiment of the intake silencer according to the present invention.

FIG. 3 is an arrow view corresponding to line AA in FIG. 2;

FIG. 4 is a side sectional view showing a second embodiment of the intake silencer according to the present invention.

FIG. 5 is a side sectional view showing a third embodiment of the intake silencer according to the present invention.

FIG. 6 is a front view of a partition plate used in a third embodiment.

FIG. 7 is a side sectional view showing a fourth embodiment of the intake silencer according to the present invention.

FIG. 8 is a side sectional view showing an intake silencer of a comparative example with respect to the present invention.

FIG. 9 is a side sectional view showing a conventional intake silencer.

FIG. 10 is a sectional view corresponding to the line CC of FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Intake silencer 2 Body case 3 Passage partition wall 4 Filter part 7 Intake port 10 Exhaust port 15 Spiral passage 17 Expansion chamber

Claims (3)

(57) [Claims] An intake silencer comprising a filter (4) provided in a main body case (2) having an intake port (7) and an exhaust port (10), wherein the main body case (2) has a center. A first half (11) having a passage partition wall (3) that communicates with the exhaust port (10) to form a continuous spiral passage (15) around which air circulates from the outer periphery to the center; A second half (8) which can be combined and disassembled with the first half (11) and has the intake port (7) corresponding to a portion near the outer periphery of the spiral passage (15). The spiral passage (15) has an opening on the second half (8) side in the axial direction, and the filter portion (4) is disposed so as to close the opening. The filter portion (4) Between the air inlet (7) and the air inlet (7). 15) An intake silencer provided with an expansion chamber (17) formed to flow to a portion corresponding to an outer peripheral side. 2. A continuous spiral passage in which a center portion communicates with an exhaust port (10) in a main body case having an intake port (7) and an exhaust port (10), and air circulates from the outer periphery to the central section. An intake silencer comprising a passage partition wall (3) forming (15), and a cylindrical filter portion (4) provided so as to surround an outer peripheral side of the passage partition wall (3). . 3. A first spiral passage in which a center portion communicates with the intake port (7) in a main body case having an intake port (7) and an exhaust port (10), and air flows from a center side to an outer peripheral side. (15a), a second spiral passage (15) in which a central portion communicates with the exhaust port (10) and air flows from the outer peripheral side to the central side.
b), a partition plate (21) is interposed between the first spiral passage (15a) and the second spiral passage (15b),
The first spiral passage (15) is provided in the partition plate (21).
An intake silencer, wherein a communication hole (22) is formed for communicating the outer peripheral side of (a) with the outer peripheral side of the second spiral passage (15b).