DE2156532A1 - Fan sound absorber - using laminate fitted with plastic lips to slide into mounting - Google Patents

Abstract

Designed particularly for fans in mining applications where there is a large ambient dirt element, the outer and inner layers of the glass fibre reinforced material include plastic lips with a bead at the ends, which slide against rigid beads on the end caps of the fan housing, to the held together by a simple locking bracket. The purpose is to provided a sound absorbent layer of material which can be assembled and removed easily without the extensive manual labour in dismantling the acoustic layers on conventional fan housings.

Description

1868 11/12 _o 1971

Applicant in:

Company Maschinenfabrik Korfmann GmbH., 581 Witten, Bruchstrasse J6

Silencer for axial fans.

The invention relates to a muffler for selectively mounting in the Fördereintritts- or outlet line of axial fans for use in mining and other operations with strong Sehmutzanfall _t wherein the muffler comprises a cylindrical inner shell, an outer shell and, arranged between the casings sound-damping layer of mineral, Glass wool or the like is made »

To be inevitable and inevitable for people in the workplace To dampen the effects of sound is one how z «B. in mining, where essential for those working underground required ventilation high-speed fans must be used, since long gone over to this noise generation to be reduced by silencers of the type mentioned above. In this way, the fans or their Drone noises originating from drive motors can be dampened with success, which is caused by the in the Hegel made of sheet metal and therefore Very good sound-transmitting ducts can be passed on over great distances. With these mufflers consists of the sound-absorbing layer located in the cylinder ring space between the inner and outer casing Rock wool, glass wool or the like. Which in laborious work in as homogeneous a packing as possible in the cylinder annulus Must be stuffed »dirty depending on the amount of dirt and / or moisture that is high or low or these sound-absorbing layers closest to the inner jacket become encrusted more or less quickly. With that on it traceable specialist classes of the elasticity of the damping

3ÖS82Ö / Q1S!

1868 - f - 12.11.

layer also reduces its sound-absorbing effect increasingly so that after some time the lüllung the silencer needs to be replaced. In the case of silencers of the type mentioned above, this is done by that an end face designed in a pot construction is removed and the one located between the inner and outer jacket, used sound insulation layer in laborious and time-consuming Work with hooks, clamps and pliers must be removed from the cylinder annulus *

Based on this, the present invention has the The task is to create a muffler of the type mentioned, the muffler layer also can be quickly and easily cleaned or exchanged by a layperson and, moreover, for the easier Transport and for easier assembly has a lower weight than the previously known silencers

This object is achieved according to the invention in that the sound-absorbing layer consists of one or more mats or shells to be placed around the inner jacket and the outer jacket consists of a plastic duct that can be pushed over it Plastic duct replaced The previously laborious plugging of the sound absorbing material is dispensed with by one or more sound absorbing mats that replace this loose material and that can be quickly placed around the cylindrical and perforated jacket in just a few simple steps. The ends of the plastic duct are then pushed onto the outer leg of an angular profile ring forming the end faces of the silencer and then fastened by means of a toggle ring known per se, which can be quickly coupled.

The plastic duct that is used can be used for better assembly and for more compact filling of the silencer with The damping material is additionally equipped with a food lock or a similar connection in its longitudinal direction · That results in the. Advantage »that the entire sound

- 3 -309820/0191

1868 - Ζ-. 11/12/1971

damper is tightly stuffed and thus a retraction on the Suction side of the fan and inflation on the pressure side of the fan is avoided.

The total weight of the muffler can still be significantly reduced in that the inner jacket consists of one perforated cylinder made of impact-resistant, glass fiber reinforced polyester.

To the entire silencer a relatively shock and To give frames that are insensitive to impact, the facing side profile rings each with a further mounting profile ring welded, which also serves for suspension and screw connection with the air supply lines.

The silencer is provided, in particular for conveyor lines with an inner diameter of more than 700 mm, with a core arranged concentrically in the core casing, which, according to an advantageous feature of the invention, consists of a cylindrical core hole casing with an inner sound-absorbing coating and two pushed over the perforated casing on its end walls end caps is closed, which are bolted by means of bolts at the H · _a lterungsprofilring.

In order to be able to replace soiled or encrusted sound-absorbing material quickly and easily here too, have the easily removable end caps have nuts welded on their inside to accommodate the screw bolts, which are surrounded by spacer sleeves.

Here, too, the core hole jacket can, depending on requirements and permissible weight optionally made of thin sheet metal or glass fiber reinforced polyester.

Several embodiments of the invention are in the drawings shown schematically. Show it:

309820/0191

1868 - f- 12.11.1971

! ig. 1 shows a partial longitudinal section through the silencer, left half with, right half without core,

Figo 2 shows a longitudinal section through the lower part of the perforated Inner jacket of the silencer with dust-repellent Baffle rings,

Fig 3 a longitudinal section similar to _o Figo 2 with spacers between inner shell and sound-absorbing layer,

4 shows a longitudinal section similar to FIG. 2 with a film, which is pulled over the inner jacket,

FIG. 5 shows an enlarged reproduction of point III in FIG. 1.

The silencer 1 shown in the right half of Fig. 1 consists essentially of the perforated inner jacket 2, the outer jacket 3 formed from the plastic duct and a total of three different mats 4 made of mineral wool, glass wool or the like around the inner jacket 2 Perforated sheet metal jacket 2 and the plastic tube 3 formed annulus is closed at the end faces, for example by the angular profile ring 5, which in turn is welded onto the leg 6 'of the retaining profile ring 6. The perforated sheet metal jacket 2 is centered on the front ring edge 6 ″ of the profile leg 6 ', while the plastic ^{tube 3 is pushed over the outer leg 5 1} of the front profile ring 5. The end of the plastic tube 3 is provided with a stiffening ^{ring 3 1} while on the leg 5' the transverse profile ring 5 mounting a counter-ring is welded. 7 via the two rings 3 and ^1? moved a per se known quick to couple Direction knob ring 8, which is provided at its edges with crisscrossed wires 8. ¹

In the left half of FIG. 1, concentric with the perforated inner jacket 2, a cylindrical grain-hole jacket 9 with a sound-absorbing layer 10 is arranged, which is closed on its end sides by a pushed-over end cap 9 ¹ "on re-welded, in v / elchR the radin] im

3 0 9 8 20 ^ O "1 9 1 B ^AD ORIGINAL

1868 - / - November 12, 1971

Flow cross section of the muffler 1 arranged Screw bolts 11 are used by spacer sleeves

12 are surrounded for even bracing.

To easily transport the entire muffler 1 and To be able to hang up, the mounting profile ring 6 is with one or more shackles $ 1.

To replace the mats 4, after removing the silencer 1, first loosen the toggle ring 8 on each side and then pull off the profile rings 5 »β on one side together with the plastic duct 3. After renewal of the mat 4, the Plastiklutte 3 is pushed again, the end face concerned with the welded angle section rings 5 »6 reclosed · Subsequently, the Plastiklutte 3 in turn secured at both ends by means of the fast to be coupled gag rings 8 to the ring legs 5 ¹ of the profile rings. 5

The exchange of the damping layer 10 in the core hole jacket 9 is also carried out simply as follows: After removing the screw bolts 11, which are preferably secured by a spring ring (not shown), the spacer sleeves 12 and the end caps 9 'are removed. Then the layer 10 is pulled out and replaced by a new one. After putting on the end caps 9 ¹ and screwing in the screw bolts 11 with the spacer sleeves 12, the core hole jacket is closed again at its front sides and at the same time anchored concentrically on the inner jacket 2 of the muffler 1.

In a further embodiment of the invention, one or more baffle rings are on the inner surface of the inner jacket 2

13 is an angle used for air flow. This measure deflects the air flow with its dust particles from the perforated inner jacket, so that the dust particles cannot clog the holes in the jacket so soon. This significantly delays pollution.

- 6 309820/0191

1868 - ^ - 11.12.1971

As a further measure against pollution, the invention proposes between the inner jacket 2 and the
Sound-absorbing mats 4 spacers 14, for example in the form
of string rings to insert · This creates cavities between the inner jacket 2 and the mats 4. These cavities take up a large part of the holes
penetrating dust particles and thereby extend the operating time of the silencer, since the mats do not
clog quickly

In order to keep the dust off the mats, the invention also proposes a non-combustible, moisture-proof Immune smooth film 15 to be drawn in from the outside over the inner jacket 2 between the jacket and mats 4.

The invention outlined here on the basis of the exemplary embodiments permits several modifications. For example, it is possible to use the end caps 9 ^{1 of} the core hole jacket as an air guiding device to reduce flow losses
form, their diameter being approximately equal to that of the root circle of the blades and should reach up to this. Here, too, it is possible to manufacture the angle profile rings 5 »6 as well as the screw bolts 11, the spacer sleeves 12 and the end caps 9 ¹ from a correspondingly resistant and impact-resistant plastic.

Patent claims:

Claims (1)

- y -. 12.11.1971 Patent claims: 1. Silencer for optional installation in the delivery inlet or outlet line of axial fans for use in mining and other operations with heavy dirt accumulation, whereby the silencer consists of a cylindrical and perforated inner jacket, a cylindrical outer jacket and one between the two Coats arranged sound-absorbing layer made of mineral, glass wool or the like. Is, thereby gekennzeichne t that the sound-absorbing layer consists of one or more, around the inner jacket (2) mats (4) or bowls laid around and the outer jacket made of a plastic tube that can be pushed over it (3) exists. 2 silencer according to claim 1, characterized in that that on the inner surface of the inner jacket (2) one or more baffle rings (13) in the Angle to the air flow are used. (Fig. 2) 3β muffler according to claim 1, characterized in that that between the inner jacket (2) and the sound-absorbing layer (4) spacers (14), z. B. in the form of string rings are provided. (Fig. 3) 4c silencer according to claim 1, characterized in that that a non-flammable, moisture-proof, smooth film (15) on the outside is pulled over the inner jacket (2) (perforated plate). (Fig. 4) - 8 - 309820/0191 - ψ - 12.11.1971 5 · Silencer according to claim 1 and one of the claims 2 to 4-, characterized in that the plastic tube (3) each with its ringed ends on the outer leg (5 *) of an angular profile ring forming the end faces of the silencer (1) (5) and then by means of a known, quick-to-couple toggle ring (8) is to be attached 6. Silencer according to claim 1 and one of claims 2 to 4, characterized in that that the plastic tube (3) is cut open on one side in its longitudinal direction and both longitudinal edges are detachable are closed, e.g. B. by a zipper or similar" 7 · Silencer according to claims 1 to 6, characterized in that the inner jacket (2) consists of a perforated cylinder made of glass fiber reinforced polyester 8. Silencer according to claims 1 to 7 »thereby characterized in that the face profile rings (5) each with a further mounting profile ring (6) are welded or screwed to the air supply lines for suspension and screwing. (Fig. 1) 9. Silencer according to claims 1 to 8, with a core arranged concentrically in the core jacket, in particular for air supply lines with an inside diameter of more than 700 mm, characterized in that the core consists of a cylindrical core-hole jacket (9) with an inner sound-absorbing layer and is closed at each of its end faces by a pushed-over end cap (9 ¹ ), which are screwed to the mounting profile ring (6) by means of screw bolts (11). (Fig. 1) 309820/0191 ~ f - 11/12/1971 10β silencer according to claim 9 »characterized in that the end caps (9 ¹ )
have nuts (9 ") welded on their inside and the screw bolts (11) are surrounded by spacer sleeves (12). 11. Silencer according to claims 9 and 10, characterized in that the
Core hole jacket is optionally made of thin sheet metal or glass fiber reinforced polyester, 309820/0191 Λτ Blank page