KR20120056792A

KR20120056792A - Blower arrangement

Info

Publication number: KR20120056792A
Application number: KR1020110124055A
Authority: KR
Inventors: 루디 디트마르; 피터 피셔
Original assignee: 가드너 덴버 도이칠란트 게엠베하
Priority date: 2010-11-25
Filing date: 2011-11-25
Publication date: 2012-06-04

Abstract

PURPOSE: A blower is provided to prevent gas being transferred inside a gas channel from a gag outlet to a gas inlet and to reduce noise of the gas discharged from the gas outlet by a first noise silencer. CONSTITUTION: A blower comprises a blower(1). The blower comprises a blower housing(2), a gas inlet, and a gas outlet. The gas inlet is formed in the blower housing. The gas outlet comprises a rotation-driving blower wheel and a noise silencer(7). The noise silencer comprises a gas guide element(24). The gas guide element comprises a noise opening(25) and a noise chamber(28).

Description

Blower Equipment {BLOWER ARRANGEMENT}

The present invention relates to a blower arrangement for gas, in particular a side channel blower arrangement.

Blowers are generally known in the art. Blowers are usually used to transport gas, which is compressed during transportation. Blower operation is often associated with significant levels of noise. Generally, absorber silencers with filler material are used to reduce operating noise levels. As the filler material foam, mineral wool and / or metal wool can be used. Known absorption silencers can be used in blowers used to transport chemically safe gases, such as, for example, air.

The prior art also describes a blower installation comprising a Helmholtz resonator that attenuates the entire sound component. Such blower equipment is very expensive to manufacture.

Accordingly, a problem posed by the present invention is to provide a blower installation having one or more silencers that, on the one hand, are capable of reducing noise very broadly and on the other hand and capable of transporting chemically unsafe gases. . In addition, blower equipment, which is particularly inexpensive to manufacture, must be produced.

This problem is solved by the features provided in claim 1 according to the invention. The core of the invention is that at least one silencer device comprises at least one gas conveying element, said at least one gas conveying element comprising a plurality of noise openings and at least one gas guide for guiding the gas. And one or more sound chambers arranged in one or more portions in the transverse direction behind the gas guiding element.

During the operation of the blower, the gas in the noise openings in the one or more gas guiding elements interacts with the gas volume in the one or more noise chambers as an acoustic mass spring system leading to significantly high levels of noise reduction. Interact

By having an appropriate numerical noise opening, a laminar acoustic frictional effect also occurs in the noise opening, which further improves the noise reduction.

Rapidly increasing sound pressure in a gas flow channel bounded by one or more gas guiding elements causes time-delayed gas to enter the adjacent one or more noise chambers in the transverse direction. do. Thereafter, the pressure in the gas flow channel is reduced so that the gas volume in the noise chamber expands back into the gas guide channel. Accordingly, partial wave compensation takes place, preferably with pressure equalization or with partial sound cancellation.

One or more silencers have no filling material and the blower plant is therefore suitable for transporting chemically critical gases, such as oxygen and / or ozone. Therefore, it can be manufactured very inexpensively.

One or more gas guide elements may be made of a metallic material. This gas guiding element may be made of stretched metal, metal weave, metal fabric or perforated metal sheet. However, the gas guiding element may be made of glass fabric modification or sintered material.

It is advantageous for the noise opening to be micro-opening. Preferably, the noise opening has an opening width between 0.05 mm and 1 mm, more preferably between 0.1 mm and 0.4 mm. The ratio between the opening area of the noise opening and the total area of the gas guiding element is advantageously between 0.05% and 10%, more preferably between 1% and 5%. Each of the noise openings preferably has an elongated form, for example an elongated rectangle, in which the longitudinal sides of the noise openings are directed to the extension of the gas guiding element or to the main flow direction of the gas passing therethrough. aligned to be perpendicular to the main flow direction.

It has been proved that the thickness of the gas guide element is preferably between 0.1 mm and 1 mm and more preferably between 0.3 mm and 0.7 mm.

Further preferred embodiments are described in the dependent claims.

According to an embodiment according to claim 2, particularly good noise reduction is possible, depending on the frequency range to be attenuated. The spaces e of the screen walls from each other are preferably selected according to the frequency range to be attenuated. The preferred space e can be calculated by the following equation.

e = 42500 / f

The space e is in mm, and the frequency range f to be attenuated is measured in Hz. The e of the screen walls from each other can be regular.

In the blower arrangement according to claim 3, the screen walls have spaces which are irregular or of equal distance from each other. In this case, it is preferable that there is no or little space selected. In this way, periodic development of noise is particularly well prevented.

The embodiment according to claim 4 provides a very high level of sound damping.

The embodiment according to claim 5 provides an additional silencer element which can be manufactured particularly easily and inexpensively. This embodiment also provides a very high level of noise reduction. The additional sound pipe is designed such that the cross section is in the form of a circular ring.

The embodiment according to claim 6 makes it possible to reduce the noise from the gas outlet particularly efficiently. Alternatively, the silencer can only be connected to the pipe end directly connected to the gas outlet.

The embodiment according to claim 7 provides a closed, preferably isolated silencer. It should be noted that the space between the gas guide element and the noise housing significantly determines the effective frequency range of noise reduction. The relatively large space causes the damping start to be displaced up to the maximum lower frequency. Preferred damping ratios are formed in the frequency range between 800 Hz and 4000 Hz for spaces between 5 mm and 35 mm, preferably between 10 mm and 25 mm. Very good levels of sound absorption are achieved in the space in the frequency range between 800 Hz and 4000 Hz.

The gas guiding element according to claim 8 can be provided very inexpensively and easily. This allows for a very good level of noise reduction. It is preferred that the gas guiding element has a cross section in the form of a circular ring.

In this case, the optimum values for acoustic flow resistance are as follows.

W (pressure loss through the wall of the gas guiding pipe / gas velocity perpendicular to the gas guiding pipe) (measured at the front of the gas guiding pipe) = Dp / (0.05 m / s) = 500 to 1500 Pa s / m, where The value "0.05 m / s" is a reference speed,

Pressure loss factor (= 2 * pressure loss through the wall of the gas guiding pipe / (gas density * square of (vertical) gas velocity at the front of the gas guiding pipe) = 3000 to 7000.

Embodiments according to claims 9 to 11 describe preferred embodiments.

According to claim 12, the gas guiding pipe is changed in cross section when it extends in the longitudinal direction. In this case, the gas guiding pipe may vary in basic cross sectional shape and / or cross sectional area or size.

In an embodiment according to claim 13, the gas guiding pipe is alternating in cross section. For this purpose, the gas guiding pipes have wave troughs and wave peaks and are arranged alternately with each other.

According to claim 14, the gas guiding pipe is continuously changed in opening width. This gas guide pipe is preferably designed in the form of a hollow truncated cone. The gas guiding pipe may have a wider opening width or may be opposite to the main flow direction of the gas. Alternatively, it is possible to change rapidly.

According to claim 15, the gas guiding element is arranged in the blower housing. In addition or alternatively, it may be provided in a silencer connected to the gas outlet. It is preferred that the gas guide element is designed as a separating wall.

In the following, the invention is described by preferred embodiments with reference to the attached drawings.
1 is a perspective view of a blower installation comprising a blower and a partially cut first silencer in accordance with the present invention;
Figure 2 is a perspective view of the blower shown in Figure 1 with the housing lid removed.
3 is a cross-sectional view of the blower shown in FIG.
4 is a perspective view of a first silencer, partially cut away from FIG. 1;
5 is a longitudinal cross-sectional view of the first silencer according to the second embodiment of the present invention.
6 is a longitudinal cross-sectional view showing a first silencer according to a third embodiment of the invention.
7 is a longitudinal cross-sectional view showing a first silencer according to a fourth embodiment of the invention.
8 is a longitudinal cross-sectional view of the first silencer according to the fifth embodiment of the present invention.
9 is a longitudinal cross-sectional view of the first silencer according to the sixth embodiment of the present invention.
10 is a longitudinal cross-sectional view of the first silencer according to the seventh embodiment of the present invention.

The blower installation (blower installation) generally shown in FIG. 1 comprises a blower 1 with a blower housing 2 and a drive motor 3, which blower 1 is placed on the end face of the blower housing 2. Flange-mounted. The blower 1 has a blower wheel 4 arranged in the blower housing 2, which is shown in FIGS. 2 and 3 and comprises a plurality of blower wheel blades 5. The blower wheel 4 is rotationally driven by the drive motor 3. The blower wheel blade 5 is located in the gas channel 6 which is at least partially bounded by the blower housing 2.

A gas inlet (not shown) and a gas outlet (not shown) are provided in the blower housing 2, which are in flow connection with the gas channel 6. A first silencer 7 is connected to the gas outlet, and a general feed pipe 8 is arranged upstream of the fluid inlet.

The blower 1 is designed as a side channel blower so that the gas channel 6 is a side channel.

During the operation of the blower 1, the blower wheel 4 is rotated in the direction of the arrow 9 by the drive motor Z 3. A blower wheel blade 5 sweeping past the gas inlet draws gas into the gas channel 6 which is to be transported by the supply pipe 8 and the inlet. The blower wheel blade 5 accelerates the gas located in the gas channel 6 in the direction of an arrow 9 which can be indicated by a transport arrow. In this case, gas is contained in a cell delimited by adjacent blower wheel blades 5. At the end of the rotation, the gas wheel blade 5 pushes the gas from the gas channel 6 into the first silencer 7 via the gas outlet. A breaker (not shown) prevents the gas carried by the blower wheel 4 from being further transported from the gas outlet to the gas inlet in the gas channel 6. The first silencer 7 dampens the noise of the gas discharged from the gas outlet.

The blower housing 2 comprises a housing body 10 and a housing lid 11, which together include a blower wheel 4. The drive motor 3 is flange connected on the rear side of the housing body 10. The drive motor comprises a drive motor shaft (not shown) which is rotationally driven, which is in rotational connection with the blower wheel 4.

The blower wheel 4 is designed in the form of a disc. This blower wheel 4 comprises an internal blower wheel hub 12 with a central circular hub bore 13. The blower wheel hub 12 is formed by a hub ring 15 in the form of a circular ring which is radially connected to the hub foot 14 which delimits the hub bore 13 outward in the radial direction. The blower wheel 4 also includes a radially outer support ring 16 which connects the hub disk 15 externally and transverses the hub disk 15. Overlap laterally. The support ring 16 supports a plurality of blower wheel blades 5 distributed in the circumferential direction and projects radially. The blower wheel blades 5 have an angular spacing away from each other by an angle.

The central hub bore 13 is used to mount the drive motor shaft. A conventional connection between the drive motor shaft and the hub foot 14 to transfer torque from the drive motor shaft to the blower wheel hub 12 for rotating the blower wheel 4 about the longitudinal central axis 17. A key connection is provided.

The gas channel 6 extends in the form of a ring around the longitudinal central axis 17. The gas channel 6 is bounded in the transverse direction by the housing body 10 and the housing lid 11. The gas silencer 6 is provided with a second silencer 18. The second silencer 18 comprises a gas guiding element 19 which separates the gas channel 6 into a gas flow channel 20 and a noise chamber 21. The blower wheel blade 5 is located in the gas flow channel 20. The gas flow channel 20 is arranged adjacent to the housing lid 11, and the noise chamber 21 is positioned laterally adjacent to the gas flow channel 20 or behind the gas flow channel 20. do. The gas flow channel 20 is bounded by the housing lid 11, the gas guide element 19 and bounded outwardly in the radial direction by the housing body 10. The gas guide element 19 is thus located opposite the housing lid 11.

The gas guiding element 19 thus forms a separating wall in the gas channel 6 and is arranged in a ring form around the longitudinal central axis 17. The gas guide element 19 is designed to bend in the form of a circular arc in cross section. The gas guide element 19 is arranged in the central area away from the housing lid 11 from the edge portion of the gas guide element.

A plurality of noise openings 22 are arranged in the gas guide element 19, which form a flow connection between the gas flow channel 20 and the noise chamber 21. The silence chambers 21 are separated from each other by screen walls 23 arranged back and forth in the gas flow channel 20 in the main flow direction of the gas. The noise chamber 21 is also arranged back and forth in the gas flow channel 20 in the main flow direction of the gas. The screen walls 23 are directly connected with the housing body 10 and arranged substantially radially.

The first silencer 7 comprises a gas guide element 24, which is designed in the form of a tube and in the form of a ring with a circular cross section. Gas exiting the gas outlet flows axially through the gas guide element 24. The gas guide element 24 has a plurality of transverse noise openings 25 in the wall of the gas guide element. The noise opening 25 is arranged in the noise housing 26 and bounds in the outward direction of the gas flow channel 27, the gas flow channel 27 passing through the noise opening 25 and the noise chamber 28. Is in flow connection with. The noise chamber 28 is bounded outward by the noise housing 26 and arranged in the transverse direction behind the gas flow channel 27. The noise chamber 28 is designed to be in the form of a circular ring in cross section.

The noise chambers 28 are separated from each other by screen walls 29 arranged substantially parallel and having the same space from each other. The silence chambers 28 are arranged back and forth with each other in the main flow direction of the gas in the gas guide element 24. This noise chamber 28 is bounded by two adjacent screen walls 29, a gas guide element 24 and a noise housing 26. The noise chamber 28 is arranged in the longitudinal central axis 17 in the transverse direction behind the gas flow channel 20.

The gas guide element 24 is arranged concentrically in the noise housing 26. The gas guide element 24 has a longitudinal central axis 31 coinciding with the longitudinal central axis 32 of the noise housing 26. The silence chamber 28 is arranged perpendicularly to the longitudinal central axis 31 in the transverse direction behind the gas guide element 24.

During blower 1 operation the gas usually flows along the gas flow channel 20 in the direction of the arrow 9. This gas passes through the gas flow channel 20 through separate noise chambers 21 arranged back and forth with each other in the main flow direction of the gas in the gas flow channel 20. A portion of the gas flows perpendicularly to the main flow direction of the gas and is pushed through the noise opening 22 in the gas guide element 19 so as to be arranged transversely at the rear of the gas flow channel 20. ) This gas can then flow back into the gas flow channel 20 through the noise openings 22 of the respective noise chambers 21.

The gas from the gas outlet is introduced into the gas flow channel 27 via the gas inlet and usually passes through individual noise chambers 28 arranged back and forth with each other in the longitudinal central axis 31 direction or in the main flow direction of the gas. A portion of the gas flows perpendicularly to the main flow direction of the gas and passes through the noise opening 25 into the noise chamber 28 arranged laterally behind the gas flow channel 27. The gas may flow from the noise chamber 28 through the noise opening 25 and back into the gas flow channel 27. The screen wall 29 may have a screw opening 30. The gas exits the gas flow channel 27 via a gas outlet opposite the gas inlet.

In the following description with reference to FIG. 5, a first silencer according to a second preferred embodiment of the invention is described, wherein the reference number of the first silencer is indicated by 7a. Identical components are denoted by the same reference numerals as in the first embodiment. Components that are structurally different but functionally similar are denoted by the same reference numerals with the addition of "a". Compared with the first silencer 7 according to FIGS. 1 and 4, the silencer 7a according to FIG. 5 has the same axial length of the silencers 7, 7a but with a greater number, preferably It has a much larger number of screen walls 29. The screen wall 29 thus has a smaller space in the longitudinal central axis 31 or 32 with respect to each other than the first embodiment and correspondingly has a shorter noise chamber 28a in the axial direction. The space of the screen walls 29 from each other is constant.

In the following description with reference to FIG. 6, a silencer according to a third embodiment of the invention is described, which is indicated by reference numeral 7b. Compared with the silencer 7 shown in FIGS. 1 and 4, the screen wall 29 has spaces that are irregularly or unequally spaced from each other in the direction of the longitudinal central axis 31 or 32. The noise chambers 28b thus have different lengths in the direction of the longitudinal central axis 31 or 32. One noise chamber 28b may have an axial length that corresponds to a multiple of the axial length of the different noise chambers 28b.

In the following description with reference to Fig. 7, a silencer according to a fourth embodiment of the present invention is described, which is indicated by reference numeral 7c. This silencer 7c is different from the silencer 7 according to the first embodiment in that the gas guiding element 24 is arranged eccentrically in the silencer housing 26. The longitudinal central axis 31 of the gas guide element 24 thus does not coincide with the longitudinal central axis 32 of the noise housing 26. The gas guide element 24 is designed to be in the form of a tube.

In the following description with reference to Fig. 8, a silencer according to a fifth embodiment of the present invention is described, which is indicated by reference numeral 7d. The silencer 7d has a gas guide element 24d in the form of a tube designed in the form of a hollow truncated cone. The cross sectional area of the gas guide element 24d is constantly changing. The cross sectional area at the first end of the gas guide element 24d may be a multiple of the cross sectional area of the second end opposite. This cross sectional area may for example be between 2 and 10 times and preferably may vary between 4 and 8 times.

According to a sixth embodiment of the invention, the silencer 7e shown in FIG. 9 has a gas guide element 24e in the form of a tube, the wall of which is designed to be like a wave. do. The wall thus has wave peaks 33 and wave valleys 34, which are arranged alternately with each other. The crest 33 or wave trough 34 is arranged back and forth with each other in the direction of the longitudinal central axis 31.

In the silencer 7f shown in FIG. 10 according to the seventh embodiment of the invention, the gas guiding element 24 in the form of a tube is arranged in an additional noise element 35, which is also a tube. It is designed to be shaped and has a cross section in the form of a circular ring. The silencer 7f has a longitudinal central axis 36 coincident with the longitudinal central axis 31 or 32. The additional noise element 35 is basically designed similar to the gas guide element 24. This sound element 35 also has a plurality of sound apertures 25.

It should be noted that it is also possible to selectively combine the individual silencers 7 to 7f. The invention relates in particular to the design or location of the screen wall 29 installation and the gas guiding elements 24, 24d, 24e.

The silencers of the present invention can be used in a variety of blowers, such as axial blowers, radial blowers or side channel blowers.

Claims

In blower installations, in particular in side channel blower arrangements for gases,
The blower equipment is:
a) including a blower (1),
The blower 1 is:
b) a blower housing (2),
c) one or more gas inlets formed in the blower housing 2,
d) one or more gas outlets formed in the blower housing (2), the gas outlets being in flow connection with the one or more gas inlets,
e) one or more rotary-driven blower wheels 4 arranged in the blower housing 2 for transferring gas from the one or more gas inlets to the one or more gas outlets,
f) one or more silencers 7; 7a; 7b; 7c; 7d; 7e; 7f; 18;
The one or more silencers 7; 7a; 7b; 7c; 7d; 7e; 7f; 18 are:
g) one or more gas guiding elements (19; 24; 24d; 24e) for guiding gas, said one or more gas guiding elements (19; 24; 24d; 24e) comprising a plurality of sound apertures (22; 25) Including,
h) one or more sound chambers 21; 28; 28a; 28b; 28c; 28d; 28e; 28f, wherein the one or more sound chambers 21; 28; 28a; 28b; 28c; 28d; 28e; 28f :
i) in flow connection with said noise openings 22; 25,
j) a blower arrangement arranged in at least one portion in the transverse direction behind the at least one gas guiding element (19; 24; 24d; 24e).

The method of claim 1,
The one or more noise chambers 21; 28; 28a; 28b; 28c; 28d; 28e; 28f are bounded by screen walls 23; 29; 29c; 29d; 29e; 29f, and the screen wall 23 29; 29c; 29d; 29e; 29f are arranged at a distance from each other in the main flow direction of the gas and connected to the gas guide elements (19; 24; 24d; 24e).

The method of claim 2,
Blower installation, characterized in that the screen walls (29) are located at unequal distances from each other.

The method according to any one of claims 1 to 3,
Blower installation, characterized in that at least one additional silencer element (35) comprising a plurality of noise openings (25) is arranged transversely behind the gas guide element (24).

The method of claim 4, wherein
The additional noise element 35 is designed as an additional noise tube.

6. The method according to any one of claims 1 to 5,
And at least one silencer (7; 7a; 7b; 7c; 7d; 7e; 7f) is connected to the gas outlet.

The method according to claim 6,
The one or more silencers 7; 7a; 7b; 7c; 7d; 7e; 7f are outwardly delimiting the one or more silence chambers 28; 28a; 28b; 28c; 28d; 28e; 28f. and a delimiting noise housing (26), wherein said gas guide elements (24; 24d; 24e) are arranged in said noise housing.

The method according to any one of claims 1 to 3,
Blower installation, characterized in that the gas guide element (24; 24d; 24e) is designed as a gas guide tube.

The method of claim 8,
The noise housing (26) is designed in the form of a tube, wherein the gas guiding elements (24; 24d; 24e) and the noise housing (26) are arranged concentrically with respect to each other.

The method according to claim 5 or 9,
And said gas guiding element (24), said further noise tube (35) and said noise housing (26) are arranged concentrically with each other.

The method of claim 8,
The noise housing (26) is designed in the form of a tube, wherein the gas guiding element (24) and the noise housing (26) are eccentrically arranged with respect to each other.

The method according to any one of claims 8 to 11,
Blower installation, characterized in that the cross section is changed when the gas guiding pipe (24d; 24e) extends in the longitudinal direction.

The method of claim 12,
The gas guiding pipe (24e) has a wall, characterized in that it has a wall designed to be a wave-like shape when the gas guiding pipe (24e) extends in the longitudinal direction.

The method of claim 12,
The gas guide pipe (24d) is blower equipment, characterized in that the opening width of the gas guide pipe (24d) is constantly changing.

The method according to any one of claims 1 to 14,
The at least one gas guiding element (19) is arranged in the blower housing (2) and is characterized in that the gas flow channel (20) is delimited at one or more portions between the gas inlet and the gas outlet.