CN108286533B - Silencer for air inlet of axial flow fan - Google Patents

Abstract

The invention provides an axial fan air inlet silencer, comprising: the device comprises a first mounting rack (1), a second mounting rack (8), a connecting plate (2), a fastening ring (3), a cylindrical shell (4), a plurality of filters (5), a plurality of silencing boxes (6), a plurality of silencing flow guide inserts (7) and a conical sound absorption layer (10); the middle part of one end of the cylindrical shell (4) is provided with a round hole, the first mounting frame (1) and the second mounting frame (8) are oppositely arranged and are connected through the connecting plate (2) to form an annular structure, and the fastening ring (3) is used for further fastening; a plurality of rectangular openings with the same size are symmetrically formed in the outer circumferential wall of the cylindrical shell (1) to serve as air inlets, a silencing box (6) is installed at each rectangular opening, and a filter (5) is installed on each silencing box (6); the conical sound absorption layer (10) is mounted at the other end of the cylindrical housing (4).

Description

Axial flow fan inlet muffler

technical field

The invention relates to the field of muffler equipment, in particular to a muffler for an air inlet of an axial flow fan.

Background technique

In recent years, with the rapid development of social economy, noise pollution has attracted more and more attention. Working in high-noise industrial places for a long time, the staff will experience symptoms such as auditory fatigue, headache, tinnitus, and even loss of hearing in severe cases; therefore, noise control in industrial places is becoming more and more important.

At present, the axial flow fan mainly adopts the air inlet muffler at the air inlet for noise reduction. However, the axial flow fan has large noise, fast wind speed, and few noise reduction schemes, and the air inlet muffler has a large volume, is difficult to fix, has a large flow resistance, and has a general noise reduction effect, which is difficult to meet the requirements.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the above-mentioned defects of the existing axial flow fan inlet muffler, and design a muffler with integrated axial flow fan inlet impedance with small volume, simple structure and remarkable noise reduction effect.

In order to achieve the above purpose, the present invention provides a muffler for the air inlet of an axial flow fan, which is a cylindrical annular array structure as a whole and is connected to the air inlet of the axial flow fan, including: a first mounting frame, a second mounting frame, a connecting plate , a fastening ring, a cylindrical shell, a number of filters, a number of muffler boxes and a number of muffler guide inserts; the end face of one end of the cylindrical shell is provided with an end face flange, and a circular hole is opened in the middle , and serve as an air inlet channel; the first mounting frame and the second mounting frame are placed opposite to each other, and the two are connected through the connecting plate to form an annular structure, which is sleeved on the outside of the cylindrical shell On the circumferential wall, it is further tightened by the fastening ring; on the outer circumferential wall of the cylindrical shell, there are symmetrically opened a number of rectangular openings of the same size as air inlets, and an air inlet is installed at each of the rectangular openings In the muffler box, a filter is installed on each muffler box; a conical sound-absorbing layer is installed on the other end of the cylindrical shell, and the conical sound-absorbing layer is facing the axial flow fan A layer of sound-absorbing material is covered on the inner wall of the cylindrical shell; a plurality of the sound-absorbing and guiding inserts are embedded in the inner wall of the conical shell along the circumferential direction.

In the above technical solution, the filter corresponds to the rectangular opening to form an air inlet channel.

In the above technical solution, the number of the rectangular openings is the same as the number of the muffler box and the filter.

In the above-mentioned technical scheme, the said muffler guide plug-in is a chamfered type muffler guide plug-in, and the chamfer is 45°-90°; and the lateral length of the muffler guide plug-in is 1/1 of the lateral length of the rectangular mouth 4-1/2, which not only ensures the ventilation and reduces the noise.

In the above technical solution, a partition is arranged inside the sound-absorbing and deflecting plug-in, and the sound-absorbing cavity inside is divided into two parts to increase the sound insulation effect and reduce sound radiation; The thickness of the sound layer gradually decreases from large to small along the length direction of the muffler guide insert.

In the above technical solution, a layer of high areal density sound insulation material is laid on the outer walls of the cylindrical shell and the conical sound absorption layer respectively, and a metal shell is added outside the high areal density sound insulation material.

In the above technical solution, a damping plate is added between the outer wall of the cylindrical shell and the high areal density sound insulation material, and a damping plate is added between the outer wall of the tapered sound absorbing layer and the high areal density sound insulation material. board to increase sound insulation.

In the above technical solution, a perforated plate is respectively installed on the peripheral outer surface of the muffler and guide insert as a protective panel for supporting the muffler material and absorbing noise. The protective panel, the muffler and guide insert, the cylindrical shell and the conical sound-absorbing layer together form a right-angle air inlet channel.

In the above technical solution, the hole of the perforated plate is Φ2mm, and the perforation rate is 23%-28%.

In the above technical solution, the filter is made of activated carbon material, and the frame of the filter is made of aluminum profiles covered with corrugated aluminum material to ensure support strength, good permeability, smooth air intake, and effectively absorb toxic and harmful substances to improve air quality.

The advantages of the present invention are:

1. The muffler of the present invention can perform secondary absorption on the reflected noise of the muffler guide insert through the cooperation of the sound absorbing guide insert, the conical sound absorbing layer, and the cylindrical shell, and can effectively carry out the air inlet of the fan. Noise reduction and sound insulation to prevent noise radiation;

2. The overall structure is impedance design, and there are resistive sound-absorbing materials and sound-absorbing elbow structures in the air inlet channel, which can effectively reduce noise radiation pollution;

3. The muffler and diversion plug-in of the present invention can increase the length of the muffler channel while guiding the flow, and at the same time, the baffle plate installed inside the plug-in can effectively insulate sound and prevent sound from radiating to the outside; and the chamfered angle of the muffler and diversion plug-in The conical structure can effectively reduce the wind resistance and increase the width of the sound absorption frequency band; the conical sound absorption layer of the conical structure can effectively reduce the wind resistance and make the ventilation smooth;

4. The muffler of the present invention has the characteristics of simple structure, convenient processing and remarkable noise reduction effect;

5. The filter has good permeability, smooth air intake, and at the same time effectively absorbs toxic and harmful substances to improve air quality.

Description of drawings

Fig. 1 is the structural representation of a kind of axial flow fan air inlet muffler of the present invention;

Fig. 2 is the left side view of a kind of axial flow fan air inlet muffler of the present invention of Fig. 1;

Fig. 3 is the radial side view of a kind of axial flow fan air inlet muffler of the present invention of Fig. 1;

Fig. 4 is a radial cross-sectional view of the muffler at the inlet of an axial flow fan of the present invention of Fig. 1;

5 is a schematic structural diagram of a muffler and guide plug-in for an air inlet muffler of an axial flow fan according to the present invention;

Fig. 6 is the schematic diagram of the chamfer of a kind of muffler of the muffler at the inlet of the axial flow fan of the present invention of Fig. 5;

1. First mounting frame 2. Connecting plate 3. Fastening ring

4. Cylindrical shell 5. Filter 6. Muffler box

7. Muffler and guide plug-in 8. Second mounting frame 9. End flange

10. Conical sound-absorbing layer 11. Damping plate 12. Partition plate

13. Protective panel

Detailed ways

The present invention will be further described below with reference to the accompanying drawings.

As shown in Figures 1 and 2, the present invention provides an axial-flow fan inlet muffler, which is a cylindrical annular array structure as a whole, and is connected to the axial-flow fan inlet, including: a first mounting frame 1, a second mounting frame Rack 8, connecting plate 2, fastening ring 3, cylindrical shell 4, 7 filters 5, 7 muffler boxes 6 and 6 muffler guide inserts 7; the left end face of the cylindrical shell 4 An end face flange is provided, and a circular hole is opened in the middle, which is used as an air inlet channel; the first installation frame 1 and the second installation frame 8 are placed opposite to each other, and the two are connected by the connecting plate 2, An annular structure is formed, and is sleeved on the outer circumferential wall of the cylindrical shell 4, and is further fastened by the fastening ring 3; Two rectangular ports of the same size are used as air inlets, that is, three rectangular ports are distributed on the left side of the cylindrical shell 4, three rectangular ports are symmetrically distributed on the right side and one rectangular port is distributed at the bottom; A muffler box 6 is installed at the mouth, and a filter 5 is installed on each muffler box 6; a conical sound-absorbing layer 10 is installed on the right end of the cylindrical shell 4, the cone The sound-absorbing layer 10 is facing the air inlet of the axial flow fan; the inner wall of the cylindrical shell 4 is covered with a layer of sound-absorbing material; a plurality of the sound-absorbing and guiding inserts 7 are embedded in the cylindrical shell 4 along the circumferential direction. in the inner wall.

In the above technical solution, as shown in FIG. 3 , the filter 5 corresponds to the rectangular opening to form an air inlet channel.

In the above technical solution, the number of the rectangular openings is the same as the number of the muffler box 6 and the filter 5 .

In the above-mentioned technical scheme, as shown in Figures 5 and 6, the muffling and guiding plug-in 7 is a chamfering type muffling and guiding plug-in, and the chamfering angle is 75°; and the lateral length of the muffling and guiding plug-in 7 is the The horizontal length of the rectangular port is 1/4, which not only ensures the ventilation volume but also reduces the noise.

In the above technical solution, as shown in FIG. 4 , a partition 12 is arranged inside the sound-absorbing and deflecting plug-in 7, and the sound-absorbing cavity inside is divided into two, so as to increase the sound insulation effect and reduce the sound radiation; The thickness of the sound-absorbing layer of the sound-absorbing and guiding insert 7 gradually decreases from left to right along the length direction of the sound-absorbing and guiding insert 7 .

In the above technical solution, a perforated plate is installed around the muffler and guide plug-in 7 as a protective panel 13; and the area of the protective panel 13 installed on the upper surface of the muffler guide plug-in 7 is larger than that installed on the other three surfaces. The area of the protective plate 13; the protective plate at the upper surface is arc-shaped, and its circular tangent is consistent with the circular tangent of the inner wall of the cylindrical shell 4; Straight type perforated plate without arc. The protective panel 13 , the muffler and guide insert 7 , the cylindrical shell 4 and the tapered sound absorbing layer 10 together form a right-angle air inlet channel.

In the above technical solution, a layer of high-area-density sound insulation material is laid on the outer walls of the cylindrical shell 4 and the conical sound-absorbing layer 10 respectively, and a metal material is added outside the high-area-density sound insulation material. shell.

In the above technical solution, a damping plate 11 is added between the outer wall of the cylindrical shell 4 and the high areal density sound insulation material, and between the outer wall of the tapered sound absorbing layer 10 and the high areal density sound insulation material. A damping plate 11 is added between to increase the sound insulation.

In the above technical solution, the tapered structure of the shown tapered sound absorbing layer 10 is located inside the cylindrical shell 4 and faces the noise source.

In the above technical solution, a layer of high-area-density sound insulation material is laid on the inner wall of the muffler box, and a conical structure is added to the inner wall at the right end to increase the sound insulation effect.

The hole of the perforated plate is Φ2mm, and the perforation rate is 25%.

As shown in FIG. 4 , the noise source emits noise, and the noise passes through the air inlet channel and is partially absorbed by the cylindrical shell 4 . Through the filter, the wind enters the cylindrical shell along the rectangular opening of the muffler box 6 . 4. Inside, the wind and noise collide, and then pass through the conical structure of the conical sound-absorbing layer 10 to gradually absorb the noise of different frequency bands. After experimental tests, it can achieve a significant noise reduction effect of 12-18dBA, and the heat dissipation is good. Running smoothly.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the embodiments, those of ordinary skill in the art should understand that any modification or equivalent replacement of the technical solutions of the present invention will not depart from the spirit and scope of the technical solutions of the present invention, and should be included in the present invention. within the scope of the claims.

Claims (6)

1. The utility model provides an axial fan air intake silencer, its wholly is a cylinder annular array structure, and links to each other with axial fan air intake, includes: the device comprises a first mounting rack (1), a second mounting rack (8), a connecting plate (2), a fastening ring (3), a cylindrical shell (4), a plurality of filters (5), a plurality of silencing boxes (6), a plurality of silencing flow guide inserts (7) and a conical sound absorption layer (10); the end face of one end of the cylindrical shell (4) is provided with an end face flange, and the middle part of the cylindrical shell is provided with a round hole which is used as an air inlet channel; the first mounting frame (1) and the second mounting frame (8) are oppositely arranged and connected through the connecting plate (2) to form an annular structure, are sleeved on the outer circumferential wall of the cylindrical shell (4) and are further fastened through the fastening ring (3); a plurality of rectangular openings with the same size are symmetrically formed in the outer circumferential wall of the cylindrical shell (4) to serve as air inlets, one silencing box (6) is installed at each rectangular opening, and one filter (5) is installed on each silencing box (6); a conical sound absorption layer (10) is arranged at the other end of the cylindrical shell (4), and the conical sound absorption layer (10) is over against an air inlet of the axial flow fan; covering a layer of silencing cotton on the inner wall of the cylindrical shell; the silencing and flow guiding inserts (7) are embedded into the inner wall of the cylindrical shell (4) along the circumferential direction;

the silencing and flow guiding plug-in (7) is a chamfer type silencing and flow guiding plug-in, and the chamfer is 45-90 degrees; the transverse length of the silencing and flow guiding insert (7) is 1/4-1/2 of the transverse length of the rectangular opening;

a partition plate (12) is arranged in the silencing and flow guiding plug-in piece (7) to divide a sound absorption cavity in the silencing and flow guiding plug-in piece into two parts; the thickness of the sound absorption layer of the sound attenuation and flow guide insert (7) is gradually reduced from large to small along the length direction of the sound attenuation and flow guide insert (7);

perforated plates are arranged around the silencing and flow-guiding insert (7) to be used as a protective panel (13); the area of a protective panel (13) arranged on the upper surface of the silencing and flow guiding insert (7) is larger than the area of the protective panels (13) arranged on the other three surfaces; the protective panel on the upper surface is arc-shaped, and the circle tangent line of the protective panel is consistent with the circle tangent line of the inner wall of the cylindrical shell (4); the other three sides of the silencing and flow-guiding plug-in (7) are provided with guard plates which are straight perforated plates and have no radian; the guard plate (13), the silencing and flow guiding insert (7), the cylindrical shell (4) and the conical sound absorption layer (10) jointly form a right-angle air inlet channel.

2. The axial flow fan air inlet silencer according to claim 1, wherein the number of the rectangular openings is the same as the number of the silencing boxes (6) and the number of the filters (5).

3. The silencer for the air inlet of the axial flow fan as claimed in claim 1, wherein a layer of high areal density sound insulation material is laid on the outer walls of the cylindrical shell (4) and the conical sound absorption layer (10), and a metal casing is attached to the high areal density sound insulation material.

4. The silencer of the air inlet of the axial flow fan as claimed in claim 3, wherein a damping plate (11) is additionally arranged between the outer wall of the cylindrical shell (4) and the high-surface-density sound insulation material, and the damping plate (11) is additionally arranged between the outer wall of the conical sound absorption layer (10) and the high-surface-density sound insulation material.

5. The silencer for the air inlet of the axial flow fan as claimed in claim 1, wherein the holes of the facing plate (13) are Φ 2mm, and the perforation rate is 23% -28%.

6. The silencer of the air inlet of the axial flow fan as claimed in claim 1, wherein the filter (5) is made of activated carbon material, and the frame is made of aluminum profile material covering corrugated aluminum material.

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