CN112483432A

CN112483432A - Low-noise centrifugal draught fan

Info

Publication number: CN112483432A
Application number: CN202011238951.4A
Authority: CN
Inventors: 杜曼
Original assignee: Shanghai Pulinghui Environmental Protection Engineering Co ltd
Current assignee: Shanghai Pulinghui Environmental Protection Engineering Co ltd
Priority date: 2020-11-09
Filing date: 2020-11-09
Publication date: 2021-03-12
Anticipated expiration: 2040-11-09
Also published as: CN112483432B

Abstract

The invention belongs to the technical field of centrifugal draught fans, and particularly relates to a low-noise centrifugal draught fan which comprises a centrifugal draught fan body, wherein two support frames are fixedly arranged at the bottom of the centrifugal draught fan body, the bottoms of the two support frames are fixedly provided with a same I-shaped frame, the bottom of the I-shaped frame is fixedly provided with four buffering legs which are arranged in a rectangular shape, each buffering leg comprises a fixed disc, the bottom of the fixed disc is fixedly provided with a lower rubber sound-insulation friction pad, the top of the fixed disc is fixedly provided with a cylinder, a round box with an opening at the bottom is slidably sleeved on the cylinder, and a lower rubber pad is fixedly arranged in the. The invention has high practicability, stably realizes the purpose of improving the sound absorption and noise reduction effects by reducing the flow velocity of wind, and can effectively reduce the vibration generated when the centrifugal draught fan body works by arranging the four buffering legs, thereby achieving the purpose of reducing the noise.

Description

Low-noise centrifugal draught fan

Technical Field

The invention relates to the technical field of centrifugal induced draft fans, in particular to a low-noise centrifugal induced draft fan.

Background

Induced draft fans are widely used for ventilation, dust exhaust and cooling of industries, mines, tunnels, vehicles and buildings; the ventilation and the induced draft of boiler to and cooling and ventilation among air conditioning equipment and the domestic equipment, the theory of operation of induced draft fan: the gas is treated as incompressible fluid by using the low flow rate of the gas and the small pressure change of the air, so that the change of the specific volume of the gas is not considered, and the induced draft fan is a fluid machine which depends on mechanical energy input from the outside and can improve the pressure of the gas by using the mechanical energy and simultaneously eliminate and convey some gas.

Through examining the institute, the license number is CN210218157U discloses a centrifugal draught fan, including the base, base upper end both sides fixed connection backup pad, fixed connection casing between two backup pads on the base, a plurality of backup pad upper end fixed connection casings, the casing is equipped with first plenum and second plenum, a plurality of protection pipes of fixed connection on the casing lateral wall, a plurality of protection pipes all are equipped with the protection network, the base upper end is close to casing one side fixed connection supporting shoe, supporting shoe upper end fixed connection servo motor, the first impeller of first plenum fixed connection in the servo motor passes the casing, the utility model discloses the beneficial effect who reaches is: the utility model discloses centrifugal draught fan adopts bilobed wheel syntropy to rotate with fast, and it is better to induced draft the effect, and the protection network on the protection tube also prevents effectively that great granule from getting into the plenum in the air, makes the plenum card blunt lead to damaging and influences the machine operation to double suction opening also has fine effect of induced drafting to rectangle and oval-shaped wind gap.

However, the centrifugal fan is a device for pressurizing and discharging air, and when the centrifugal fan is used, the noise is high, the existing centrifugal fan cannot well eliminate the noise and harm the environment and workers, and when the centrifugal fan is fixed, the centrifugal fan cannot be subjected to shock absorption protection, so that the noise is not easy to eliminate.

Therefore, we propose a low-noise centrifugal induced draft fan to solve the above problems.

Disclosure of Invention

The invention aims to solve the defects in the prior art and provides a low-noise centrifugal induced draft fan.

In order to achieve the purpose, the invention adopts the following technical scheme: a low-noise centrifugal draught fan comprises a centrifugal draught fan body, wherein two support frames are fixedly mounted at the bottom of the centrifugal draught fan body, the bottom of the two support frames is fixedly provided with a same I-shaped frame, the bottom of the I-shaped frame is fixedly provided with four buffering legs which are arranged in a rectangular shape, each buffering leg comprises a fixed disc, the bottom of the fixed disc is fixedly provided with a lower rubber sound-insulation friction pad, the top of the fixed disc is fixedly provided with a cylinder, the cylinder is sleeved with a round box with an opening at the bottom in a sliding manner, a lower rubber pad is fixedly mounted in the cylinder, the bottom of the lower rubber pad is fixedly connected with the top of the fixed disc, an upper rubber pad is fixedly mounted on the inner wall of the top of the round box, four first springs which are arranged in a rectangular shape are fixedly mounted at the top of the lower rubber pad, the top of circle case and the bottom fixed connection of I-shaped frame, be equipped with the air outlet on the centrifugal draught fan body, fixed mounting has the acoustic celotex board in the air outlet, slidable mounting has the baffle in the air outlet, it has a plurality of buffer tubes to establish fixed mounting between acoustic celotex board and the baffle, and a plurality of buffer tubes run through corresponding baffle and acoustic celotex board respectively.

Preferably, all set up the fixed orifices that equals with buffer tube quantity on acoustic celotex board and the baffle, a plurality of buffer tubes run through corresponding fixed orifices respectively and with the inner wall fixed connection of corresponding fixed orifices.

Preferably, the bottom fixed mounting of acoustic celotex board has four montants that are the rectangle and arrange, and four montants all run through the baffle and with baffle sliding connection, one side that acoustic celotex board and baffle are close to each other is equipped with four second springs, the top and the bottom of four second springs respectively with acoustic celotex board and baffle fixed connection, and four second springs slip the cover respectively and establish on the montant that corresponds.

Preferably, the top fixed mounting of circle case has four internal thread sleeves that are the rectangle and arrange, four internal thread sleeves all are in the same place through bolt and I-shaped frame fixed connection, go up the equal fixed mounting in one side that rubber pad and lower rubber pad are close to each other and have four spacing posts that are the rectangle and arrange, four first springs slip the cover respectively and establish on two first spacing posts that correspond, the ring channel has been seted up on the inner wall of circle case, slidable mounting has the annular piece in the ring channel, the annular piece slip cover is established on the drum.

Preferably, the acoustic celotex board includes first baffle, second baffle and a plurality of sound cotton granule of inhaling, offer on the first baffle and inhale the sound hole that is the rectangular array distribution that sound cotton granule quantity equals, the top of second baffle is seted up flutedly, set up on the bottom inner wall of recess and inhale the spacing groove that is the rectangular array distribution that sound cotton granule quantity equals, a plurality of bottoms and the top of inhaling the sound cotton granule are inconsistent with the spacing groove for other and corresponding sound hole and spacing groove.

Preferably, four slide holes have been seted up on the baffle, four montants run through corresponding slide hole respectively and with the inner wall sliding connection of corresponding slide hole, equal fixed mounting has wear-resisting sealing washer in four slide holes, four montants run through corresponding wear-resisting sealing washer respectively and with the inner wall sliding connection of corresponding wear-resisting sealing washer, and the equal fixed mounting in bottom of four montants has the stopper, be equipped with four bellows between baffle and the acoustic celotex board, the top and the bottom of four bellows respectively with baffle and acoustic celotex board fixed connection, and four bellows slip cap respectively establish on the second spring that corresponds.

Preferably, the baffle is made of melamine boards and has a thickness of 0.2-0.3mm, the first partition board and the second partition board are made of multilayer glass magnesium boards, and the thickness of the first partition board and the second partition board is 1.0-20.0 mm.

Preferably, inhale the cotton granule of sound and include that the cotton layer of sound is inhaled in the range upon range of upright of a plurality of, the cotton layer of sound is inhaled in being equipped with two-layer tiling between the adjacent upright sound cotton layer of inhaling, and adjacent upright sound cotton layer of inhaling is equipped with two-layer latex resin layer between the cotton layer of sound is inhaled with the tiling, is equipped with at least one deck fibre web layer between the adjacent two-layer latex resin layer.

Compared with the prior art, the invention has the beneficial effects that: when the centrifugal draught fan body works, wind blows from the air outlet, enters into the plurality of buffer pipes through the baffles, the flow velocity of the wind flowing at high speed through the buffer pipes which are formed by winding the wind at high speed is slower, and the wind blows the baffles to be close to the sound insulation plates, the four second springs can avoid the damage of the wind flowing at high speed to the baffles, and first baffle, second baffle on the acoustic celotex board and inhale the cotton granule of sound can effectually reduce the produced noise of the interior wind that flows of cushion tube.

The invention has high practicability, stably realizes the purpose of improving the sound absorption and noise reduction effects by reducing the flow velocity of wind, and can effectively reduce the vibration generated when the centrifugal draught fan body works by arranging the four buffering legs, thereby achieving the purpose of reducing the noise.

Drawings

Fig. 1 is a schematic perspective view of a low-noise centrifugal induced draft fan according to the present invention;

FIG. 2 is an enlarged structural view of part A in FIG. 1;

FIG. 3 is a schematic view of a partially cut-away perspective structure of a middle buffering leg of a low-noise centrifugal induced draft fan according to the present invention;

FIG. 4 is a schematic cross-sectional front view of an air outlet of a low-noise centrifugal induced draft fan according to the present invention;

fig. 5 is an exploded view of the partition plate in the low-noise centrifugal induced draft fan according to the present invention.

In the figure: 1. a centrifugal induced draft fan body; 101. an air outlet; 2. a support frame; 3. an I-shaped frame; 4. a buffer leg; 401. fixing the disc; 402. a lower rubber sound-insulating friction pad; 403. a cylinder; 404. a round box; 405. a first spring; 406. an internally threaded sleeve; 407. a rubber pad is arranged; 408. a rubber pad is arranged; 5. a sound insulating board; 501. a first separator; 50101. a sound transmission hole; 502. a second separator; 50201. a groove; 50202. a limiting groove; 503. sound-absorbing cotton particles; 6. a baffle plate; 7. a buffer tube; 8. a vertical rod; 9. a second spring.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Examples

Referring to fig. 1 to 5, in the present embodiment, a low-noise centrifugal induced draft fan is provided, which includes a centrifugal induced draft fan body 1, two supporting frames 2 are fixedly installed at the bottom of the centrifugal induced draft fan body 1, the same i-shaped frame 3 is fixedly installed at the bottoms of the two supporting frames 2, four buffering legs 4 arranged in a rectangular shape are fixedly installed at the bottom of the i-shaped frame 3, each buffering leg 4 includes a fixed disk 401, a lower rubber sound-insulating friction pad 402 is fixedly installed at the bottom of the fixed disk 401, a cylinder 403 is fixedly installed at the top of the fixed disk 401, a round box 404 with an opening at the bottom is slidably sleeved on the cylinder 403, a lower rubber pad 408 is fixedly installed in the cylinder 403, the bottom of the lower rubber pad 408 is fixedly connected with the top of the fixed disk 401, an upper rubber pad 407 is fixedly installed on the inner wall of the top of, the top ends of the four first springs 405 are fixedly connected with the bottom of the upper rubber pad 407, the top of the round box 404 is fixedly connected with the bottom of the I-shaped frame 3, the centrifugal draught fan body 1 is provided with an air outlet 101, a sound insulation board 5 is fixedly installed in the air outlet 101, a baffle 6 is slidably installed in the air outlet 101, a plurality of buffer tubes 7 are fixedly installed between the sound insulation board 5 and the baffle 6, and the buffer tubes 7 respectively penetrate through the corresponding baffle 6 and the sound insulation board 5;

in this embodiment, as shown in fig. 1 to 5, the sound insulation board 5 and the baffle 6 are both provided with fixing holes having the same number as the buffer tubes 7, and the plurality of buffer tubes 7 respectively penetrate through the corresponding fixing holes and are fixedly connected with the inner walls of the corresponding fixing holes.

Preferably, the bottom fixed mounting of acoustic celotex board 5 has four montants 8 that are the rectangle and arrange, and four montants 8 all run through baffle 6 and with 6 sliding connection of baffle, and one side that acoustic celotex board 5 and baffle 6 are close to each other is equipped with four second springs 9, the top and the bottom of four second springs 9 respectively with

acoustic celotex board

5 and 6 fixed connection of baffle, and four second springs 9 slip the cover respectively and establish on the montant 8 that corresponds.

Preferably, the top of round box 404 is fixedly provided with four internal thread sleeves 406 arranged in a rectangular shape, the four internal thread sleeves 406 are fixedly connected with an i-shaped frame 3 through bolts, one side of upper rubber pad 407 and one side of lower rubber pad 408 which are close to each other are fixedly provided with four limiting posts arranged in a rectangular shape, four first springs 405 are respectively slidably sleeved on the two corresponding limiting posts, an annular groove is formed in the inner wall of round box 404, an annular block is slidably arranged in the annular groove, and the annular block is slidably sleeved on the cylinder 403.

Preferably, the baffle 5 includes first baffle 501, second baffle 502 and a plurality of sound cotton granule 503 of inhaling, offer on the first baffle 501 with inhale sound cotton granule 503 quantity equal be the sound transmission hole 50101 that the rectangle array distributes, recess 50201 has been offered at the top of second baffle 502, offer on the bottom inner wall of recess 50201 with inhale sound cotton granule 503 quantity equal be the spacing groove 50202 that the rectangle array distributes, the bottom and the top of a plurality of sound cotton granule 503 of inhaling are respectively inconsistent with spacing groove 50202 for passing sound hole 50101 and the spacing groove 50202 that corresponds.

Preferably, four slide holes have been seted up on baffle 6, four montants 8 run through corresponding slide hole respectively and with the inner wall sliding connection of the slide hole that corresponds, equal fixed mounting has wear-resisting sealing washer in four slide holes, four montants 8 run through corresponding wear-resisting sealing washer respectively and with the inner wall sliding connection of the wear-resisting sealing washer that corresponds, and the equal fixed mounting in bottom of four montants 8 has the stopper, be equipped with four bellows between baffle 6 and acoustic celotex board 5, the top and the bottom of four bellows respectively with baffle 6 and acoustic celotex board 5 fixed connection, and four bellows slip cap respectively establish on the second spring 9 that corresponds.

Preferably, the baffle 6 is made of melamine board and has a thickness of 0.2-0.3mm, the first partition 501 and the second partition 502 are made of multi-layer glass magnesium board, and the first partition 501 and the second partition 502 have a thickness of 1.0-20.0 mm.

Preferably, inhale cotton granule 503 of sound includes that the cotton layer of sound is inhaled in the range upon range of upright of a plurality of, and the cotton layer of sound is inhaled in being equipped with two-layer tiling between the cotton layer of sound to adjacent upright inhaling, and adjacent upright inhale the cotton layer of sound and the flatly inhale and be equipped with two-layer latex resin layer between the cotton layer of sound, is equipped with at least one deck fibre web layer between the adjacent two-layer latex resin layer.

Specifically, when the centrifugal induced draft fan body 1 works, the generated vibration is transmitted to the four buffering legs 4 through the two supporting frames 2 via the i-shaped frame 3, the circular box 404 slides up and down on the cylinder 403 when the buffering legs 4 work, when the circular box 404 slides up and down on the cylinder 403, the four first springs 405 play a role of buffering the sliding of the circular box 404 on the cylinder 403, the upper rubber pad 407 and the lower rubber pad 408 prevent noise generated by friction between the circular box 404 and the fixed disk 401 when the first springs 405 stretch out and draw back, when the centrifugal induced draft fan body 1 works, wind firstly enters the plurality of buffer tubes 7 through the baffle 6 when the wind blows out through the air outlet 101, the flow velocity of the wind flowing at high speed through the plurality of bent and wound tubes 7 becomes slower, so that the noise generated when the wind is discharged from the buffer tube 101 can be effectively reduced, when the baffle 6 is blown by wind to be close to the sound insulation board 5, the four second springs 9 can prevent the baffle 6 from being damaged by the high-speed flowing wind, and the first partition plate 501, the second partition plate 502 and the sound-absorbing cotton particles 503 on the sound insulation board 5 can effectively reduce the noise generated by the flowing wind in the buffer tube 7

In this embodiment, when the centrifugal induced draft fan body 1 works, the generated vibration is finally transmitted to the four buffering legs 4 through the i-shaped frames 3 by the two supporting frames 2, the round box 404 slides up and down on the cylinder 403 when the buffering legs 4 work, when the round box 404 slides up and down on the cylinder 403, the four first springs 405 play a role of buffering the sliding of the round box 404 on the cylinder 403, and the upper rubber pad 407 and the lower rubber pad 408 prevent the noise caused by friction between the round box 404 and the fixed disk 401 when the first springs 405 stretch and retract;

in the embodiment, when the centrifugal draught fan body 1 works and wind blows out from the air outlet 101, the wind firstly enters the plurality of buffer tubes 7 through the baffle 6, the flow velocity of the high-speed flowing wind passing through the plurality of bent buffer tubes 7 is slower, so that the noise generated when the wind is discharged from the air outlet 101 can be effectively reduced, when the wind blows the baffle 6 to be close to the baffle 5, the four second springs 9 can prevent the high-speed flowing wind from damaging the baffle 6, and the first baffle 501, the second baffle 502 and the sound-absorbing cotton particles 503 on the baffle 5 can effectively reduce the noise generated by the wind flowing in the buffer tubes 7, the invention has high practicability, the purpose of improving the sound-absorbing and noise-reducing effects can be stably realized by reducing the flow velocity of the wind, and the vibration generated when the centrifugal draught fan body 1 works can be effectively reduced by arranging the four buffering legs 4, therefore, the purpose of noise reduction is achieved, the stability is high, the structure is simple, the firmness is high, the cost is low, and the application prospect is good.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims

1. The utility model provides a centrifugal draught fan of low noise, includes centrifugal draught fan body (1), its characterized in that, the bottom fixed mounting of centrifugal draught fan body (1) has two support frames (2), and the bottom fixed mounting of two support frames (2) has same I-shaped frame (3), the bottom fixed mounting of I-shaped frame (3) has four buffering legs (4) that are the rectangle and arrange, buffering leg (4) include fixed disk (401), the bottom fixed mounting of fixed disk (401) has lower rubber sound insulation friction pad (402), the top fixed mounting of fixed disk (401) has drum (403), sliding sleeve is equipped with the bottom and is open-ended round case (404) on drum (403), fixed mounting has lower rubber pad (408) in drum (403), the bottom of lower rubber pad (408) and the top fixed connection of fixed disk (401), fixed mounting has last rubber pad (407) on the top inner wall of circle case (404), the top fixed mounting of lower rubber pad (408) has four first springs (405) that are the rectangle and arrange, the top of four first springs (405) all with the bottom fixed connection who goes up rubber pad (407), the top of circle case (404) and the bottom fixed connection of I-shaped frame (3), be equipped with air outlet (101) on centrifugal draught fan body (1), fixed mounting has acoustic celotex board (5) in air outlet (101), sliding mounting has baffle (6) in air outlet (101), establish fixed mounting between acoustic celotex board (5) and baffle (6) and have a plurality of buffer tubes (7), and baffle (6) and acoustic celotex board (5) that correspond are run through respectively in a plurality of buffer tubes (7).

2. A centrifugal induced draft fan with low noise according to claim 1, characterized in that the baffle (6) and the baffle (5) are provided with fixing holes with the same number as the buffer tubes (7), and the plurality of buffer tubes (7) respectively penetrate through the corresponding fixing holes and are fixedly connected with the inner walls of the corresponding fixing holes.

3. The centrifugal draught fan of claim 1, wherein the bottom of the baffle (5) is fixedly provided with four vertical rods (8) arranged in a rectangular shape, the four vertical rods (8) all penetrate through the baffle (6) and are in sliding connection with the baffle (6), one side of the baffle (5) and the baffle (6) close to each other is provided with four second springs (9), the top ends and the bottom ends of the four second springs (9) are respectively in fixed connection with the baffle (5) and the baffle (6), and the four second springs (9) are respectively sleeved on the corresponding vertical rods (8) in a sliding manner.

4. The centrifugal draught fan of claim 1, wherein the top of the round box (404) is fixedly provided with four internal thread sleeves (406) arranged in a rectangular shape, the four internal thread sleeves (406) are fixedly connected together through bolts and an I-shaped frame (3), four limit posts arranged in a rectangular shape are fixedly arranged on one side of each of the upper rubber pad (407) and the lower rubber pad (408) close to each other, the four first springs (405) are respectively slidably sleeved on the two corresponding limit posts, an annular groove is formed in the inner wall of the round box (404), an annular block is slidably arranged in the annular groove, and the annular block is slidably sleeved on the cylinder (403).

5. The centrifugal draught fan of claim 1, characterized in that, acoustic celotex board (5) are including first baffle (501), second baffle (502) and a plurality of sound cotton granule (503) of inhaling, offer on first baffle (501) with inhale the cotton granule (503) quantity equal be the sound transmission hole (50101) that the rectangular array distributes of inhaling, recess (50201) are seted up at the top of second baffle (502), offer on the bottom inner wall of recess (50201) and inhale the cotton granule (503) quantity equal spacing groove (50202) that are the rectangular array and distribute of inhaling, the bottom and the top of a plurality of sound cotton granule (503) of inhaling are inconsistent for other and corresponding sound transmission hole (50101) and spacing groove (50202).

6. The low-noise centrifugal draught fan according to claim 1, wherein four sliding holes are formed in the baffle (6), four vertical rods (8) respectively penetrate through the corresponding sliding holes and are connected with the corresponding sliding holes in a sliding manner, wear-resistant sealing rings are fixedly mounted in the four sliding holes, the four vertical rods (8) respectively penetrate through the corresponding wear-resistant sealing rings and are connected with the corresponding wear-resistant sealing rings in a sliding manner, limiting blocks are fixedly mounted at the bottoms of the four vertical rods (8), four corrugated pipes are arranged between the baffle (6) and the sound insulation board (5), the tops and the bottoms of the four corrugated pipes are fixedly connected with the baffle (6) and the sound insulation board (5) respectively, and the four corrugated pipes are respectively sleeved on the corresponding second springs (9) in a sliding manner.

7. A centrifugal induced draft fan with low noise according to claim 1, wherein the baffle (6) is made of melamine board and has a thickness of 0.2-0.3mm, the first partition board (501) and the second partition board (502) are made of multi-layer glass magnesium board, and the thickness of the first partition board (501) and the second partition board (502) is 1.0-20.0 mm.

8. A centrifugal induced draft fan with low noise as claimed in claim 1, wherein said sound-absorbing cotton particles (503) comprise a plurality of stacked upright sound-absorbing cotton layers, two flat sound-absorbing cotton layers are disposed between adjacent upright sound-absorbing cotton layers, two latex resin layers are disposed between adjacent upright sound-absorbing cotton layers and flat sound-absorbing cotton layers, and at least one fiber mesh layer is disposed between adjacent latex resin layers.