DE3000842A1 - PAINT SPRAYING CABIN - Google Patents

Description

"Parbo spray booth"

This invention relates to a paint spray booth, especially on sound-absorbing systems for the paint spray booth.

Conventional spray booths generally include an enclosed chamber through which the spray booths Articles are directed. The work floor of the cabin consists of a flat grid, under which a sub-floor lies. The sub-floor is constantly submerged during operation of the cabin, and so is the water is discharged together with the color-laden air through one or more (openings in the sub-floor. These The discharge device consists either of a continuous slot or of several flue pipes that are laid in the subfloor at intervals along the center line of the cabin.

The turbulence created in the air and in the water during the passage through the one or more openings supports the transfer of solid particles from the air into the water, from which they are then placed in a floating tank or similar treatment device.

030031/0643
BATH ORIGINAL

CARRIER DRXSIS 7370/80

But this turbulence also creates a certain amount of noises5 other noises are generated by the fans, which are constantly in operation to remove the air from the cabin. As a result, the noise level inside the cabin can be considerable be.

The present invention has set itself the task of a device for lowering the noise level in a paint spray booth equipped with a cleaning part to accomplish.

According to the present invention is a paint spray booth exists, which comprises the following part: a closed chamber that delimits the work area, a perforated chamber Work floor, a device for introducing air for the work area and for creating a downward through the perforated floor, one below the perforated work floor subfloor located at a certain distance, a device for continuous rinsing of the subfloor with a cleaning liquid and one or more openings in the underbody through which the rinsing liquid and the air can be withdrawn. It is characterized according to the invention in that a sound-absorbing device to reduce the noise

030031/0643

GABBIER DBYSIS 7370/80

300Q8A1

- 10 -

level is provided within the work area during operation of the cabin, the sound-absorbing Device is arranged under the perforated work floor and sound-deflecting baffles and next to at least one of her! "" laugh appropriate includes sound-absorbing material.

As will be described below, there are several arrangements of sound attenuating devices in accordance with the invention possible, and the design and location of these devices depend on the design and the soundproofing requirements of the relevant 3 spray booth.

In one form, the sound attenuation device includes one or more baffles in a space therebetween Work floor and the sub-floor, the baffle plate or plates are provided with a layer of sound-absorbing material applied to a surface. This or each baffle is arranged so that the sound-absorbing material is on the lower surface the baffle plate or the openings in the sub-floor opposite is.

The baffle plates expediently comprise inverted channel-shaped parts, with the acoustic material in this healing is housed in the canals

030031/0843

GAHHIEK DHYSYS 7370/80 3QQQ842

either arranged so that their edges abut or have a certain distance from one another in order to keep the resistance to the air flow low. They can extend over the whole lateral or longitudinal extent of the cabin or ₈ where a series of discharge openings provided, be mounted in groups immediately above each opening.

In a preferred embodiment, several of these baffles are attached at a distance from one another and extend transversely to the longitudinal centerline of the cabin, with its longitudinal axes in a substantially horizontal plane are arranged. These baffles are best inclined laterally around their longitudinal axis, that they create a slat effect and thereby the resistance to the air flow to a minimum reduce.

Advantageously, the exposed surface of the sound-absorbing material is made up of a bottom wall perforated sheet metal covered, which the sound-absorbing material in its position on the sound-reflecting Baffle plate holds in place and the risk of getting wet

030031 / _Q6Ä3; BATH ORIGINAL

CARRIER DRYSTS 7370/80 3Q00 B

of the material decreased. The perforation in the cover plate is intended to allow the sound to pass through the sheet metal and into the soundproofing material.

In a further embodiment of the invention, optionally or in addition to the perforated sheet a protective layer of waterproof material is provided to prevent the soundproofing material from getting wet to prevent during operation. Because getting wet by penetration of the rinsing water in the soundproofing material reduces the performance of the material during operation by one Considerable.

The use of the sound attenuation device in the form described above has proven to be valuable, to reduce the noise level inside the cabin by at least 3 dB (A).

In the case of the booth with vent openings running at certain intervals along the longitudinal axis of the booth is provided, the sound attenuation device can particularly reduce the output through these openings Noise can be constructed.

In such an arrangement, the sound attenuation device comprises individual, above one or more, openings in the space between the sub-floor and the work floor horizontal silencers.

030031/06 ^ 3 _Λ .. BAD ORIGINAL

GAHRIER DRYSIS 7370/80

Practically every silencer has a baffle plate, e.g. made of sheet metal in a generally pyramided or conical outer casing} however, any shape that tapers towards the top can be used, e.g. a truncated cone or a hemisphere or a combination of the different shapes.

The housing forms a cover, the cross-section of which tapers upwards and which is open at the bottom. The acoustic material is inside the cladding placed where it can be held in place by perforated sheets.

Best of all, the diameter or width is either The silencer at its base is slightly larger than the diameter or width of the corresponding opening, so that as much of the resulting noise as possible is covered.

In all of these embodiments described above, it is best to connect liquid (e.g. water) supplying devices to each soundproofing device, which can apply rinsing liquid to the upper surface of the baffle plates during operation _{9 in} order to prevent the upper surface from being soiled with solid paint particles.

030031 / Q643

BATH ORIGINAL

GABHIER DEISTS 7370/80

The use of the individual silencers or the other impact devices described above is reduced the noise level in the cabin during operation by a considerable amount, as the combination of soundproofing material and baffle plate as a barrier for the openings created in the subfloor by the opening or openings Noise is used.

It has been found that when the openings are of the appropriate shape and in outlet designs end with wall sections going down, a similar reduction in noise level can be achieved if the soundproofing device is guided around the outer surfaces of the wall parts themselves.

Accordingly, in another embodiment of this invention, the sound reflective baffle has the lOrm of an external, the corresponding parts whole or partially surrounding jacket and the soundproofing material is in between the outer jacket and the Wall parts of the lying room housed. To do this, the wall parts must either be perforated or made of be made of a sound permeable material.

030031/0643
BATH ORIGINAL

Such an arrangement is particularly effective when the outlets consist of individual outlet pipes. The pipe itself is advantageously made of perforated sheet metal made so that the noise can penetrate the sound absorbing material. Between the walls of the pipe and a water-tight membrane can be provided for the sound-absorbing material to wet ground the material to prevent during operation.

This design of the Schaxldamping device is very effective in reducing the noise level in the cabin.

Since the baffle plate is not attached in the space between the work floor and the sub-floor, it is an obstacle also not the air flow to the pipes and is not contaminated with paint during operation. In addition, with this arrangement, there is less need to change the internal structure of the cabin itself.

Optionally or in addition to the watertight covering, each wall part hanging down can be formed from sheet metal are bent around the openings in it so that the liquid flowing down through the opening in question does not penetrate through these openings.

030031

CABBIEH DHYSIS 7370/80

3QQUOH4 - 16 -

The invention also provides an outlet structure for the underbody of a paint spray booth as described above has been described.

For a better understanding of the invention will now be made by way of example and with reference to the attached Drawing some embodiments according to the invention described in more detail.

Pig. 1 shows a perspective view, partly in section, of a spray booth flushed with water with a soundproofing device according to the invention.

Fig. 2 is an enlarged vertical cross section of a Exhaust pipe and the associated silencer of the cabin after 3 ig. 1.

]? ig. 3 is a cross section through another outlet pipe with another ϊοπη the soundproofing device, and

Figure 4- is a cross-section through part of another outlet tube.

Of the drawings, KLg. 1 a paint spray booth 8 suitable e.g. for motor vehicles, comprising the following parts: a clad chamber 10, delimited by the walls 11,

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a ceiling 13 and a work floor 14 consisting of an open grid. The walls are with the Windows 12 and the skylights 15 provided, the air = supply into the interior of the chamber takes place through the Line 16 and the adjustable plates 17.

The cabin 8 is provided in the known manner with a sub-floor 20 located under the working floor 14 at certain intervals. The underbody consists of two inclined flat surfaces 21, 22 which lower towards the center line of the cabin 8. During the operation of the cabin 8, these surfaces 21 ₉ 22 are constantly wetted by the water pipes 23 attached at intervals along the upper hand of the surfaces.

Water and air are removed through a series of outlet structures in the form of outlet pipes 25, which are attached at certain intervals and which are arranged along the center line of the cabin 8. In the illustrated embodiment Diess a cylindrical cross-section have ₉ if they could understandably have other cross-sections, for example rectangular or square and _ö

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CSAHEIEE DEXSiS 7370/80 JQQ (J 8 4 %

with a suitable device to improve their cleaning activity, e.g. shovels or Baffle plates, can be equipped. The water flowing over the surfaces 21,22 catches the Excess Iarb mist passing through the work floor 1A on ; Paint particles further remaining in the air are removed by the mixing action that takes place inside the outlet pipes 25. The dirty water collects in a trough formed above the base 28 and is discharged through the channels 29. The pure air is via the fan housing 30 and the chimney 31 released to the outside air.

The fans in the casing 30 and also as a result of the mixing action in the outlet pipes 25 become high Generated noise level. This noise can be so loud that the working conditions within the chamber 10 are unbearable will. Tests have shown that this noise is essentially through the outlet pipes 25 themselves in the Entrance to the cabin. In order to reduce the noise level inside the cabin, according to the invention, each Outlet pipe 25 in FIG. 1 is equipped with an individual silencer 33.

030031/0643

. ^B AD.O _{RIG | NAL}

One of these silencers 33 is shown in detail in FIG. It includes a sound reflective outer shell 34 of a substantially conical shape forming baffle plate, made e.g. of mild steel, and placed in the tree between the working floor 14 and the sub-floor 20 is installed directly above the mouth of the outlet pipe 25 concerned.

The shape of the base of the muffler 33 corresponds best essentially to the shape of the outlet pipe 25; for example, if the pipe 25 has a round cross-section, as shown in Fig. 2, the muffler 33 has cones or Truncated cone shape; the outlet pipe 25 is square, the muffler 33 has the shape of a four-sided pyramid.

As can be seen from Fig. 2, the outer edges of the damper base extend beyond the actual diameter of the outlet pipe 25 to ensure that any noise generated by the pipe is from the muffler housing be caught.

The sound-reflecting housing 34 delimits a room which is provided with a layer of sound-absorbing acoustic material 36, which is essentially the the upper ϊβχΐ of the housing and at 37 to the reaches around the bottom edge.

0300 31/00 4 3, 'BAD ORIGINAL

GABBIER BEYSYS 7370/80

This material is, for example, loose fibrous acoustic material such as mineral or glass fibers; the material sold under the registered trademark SSILLTJEE SE 10 is preferred. The acoustic material 36 is held in place by means of a perforated inner wall 38, for example a sheet metal, wire mesh or thin steel sheet which is perforated to provide any free area through which the sound can penetrate. The shape of the inner wall and its free area is selected according to the frequencies to be recorded, but the inner wall should have at least a free area of 10 % . If perforated sheet metal is used, the perforation should have a diameter of at least 1 mm. For example, a 3 mm perforation was used at certain intervals in order to achieve a free area of 30 % .

The perforated wall 38 allows the sound to penetrate into the sound-absorbing material 36 where certain Frequencies are absorbed. Another absorption takes place when the sound comes from the inside of the housing 33 is reflected and fed back into the acoustic material 36.

With a suitable choice of acoustic material, selective sound frequencies can be absorbed,

0-3 0031/0643
ORIGINAL

CABSIER DIStSIS 7370/80

so that the noise level occurring in the cabin can be further reduced.

In order to prevent contamination of the outer wall of the housing 34 with solid parabolic particles which flow in the to the pipe 25 To prevent air from being contained is a water pipe 41 provided to the outer surface of the muffler during operation of the cabin with water to flush.

This water pipe 41 can be connected to the channels 25 under the cabin floor. If you lead the water pipe 21 to the top of the housing 34, a complete wetting of the Housing guaranteed.

In order to prevent the penetration of water into the acoustic material inside the housing 34, the ends perforated inner wall 38 at a distance from the lower edge of the housing Point 39, and the housing is bent over at the edges to provide a drainage point. A wetting of the acoustic Material can be completely prevented if the inner wall 38 on the inside or outside with a A layer of waterproof material, e.g. a flexible plastic sheet.

0 3 0 0

GABBIER DRYSIS 7370/80

Each muffler is in the space between the floor and bottom 20 supported so that it has the greatest possible sound absorption with a minimum of resistance to the Provides airflow. A typical position of the silencer would be 60-80 mm above the mouth of the outlet pipe 25.

Pig. 3 illustrates another embodiment of the sound attenuation device for a cabin similar to that shown in FIG.

In this case, the outlet pipe 25 has a right angle Cross-section and the pipes are provided with a baffle plate or target plate 45 against which the air and water mixture bounces to improve cleaning activity. The outlet pipe 25 comprises downwardly hanging wall parts, the form a straight-walled upper part 46 and a narrower lower part 4-7, which are arranged in a cross shape Support plates 48 which support the baffle 45 ends. The upper straight-walled part 46 is provided with a soundproofing device provided, which consists of a baffle plate in the form of a sound-reflecting jacket 49, formed by an outer wall 50 which runs all the way around the top 46 of tube 25 and out a lower wall 51. The continuous ^ upper wall of the shell 50 is formed by the lower surface of the sub-floor 20.

030031/0643 BATH ORIGINAL

GAKBIER DEISYS 7370/80

The jacket 49 forms with the walls 54 of the outlet pipe 25 a casing 53} the walls 54 are perforated in the same way as the inner wall 38 of the embodiment shown in FIG. 2, so that the sound can penetrate into this casing. The perforation 55 in this case has a diameter of 3 mm and the holes are made at certain intervals in order to give the walls 54 a 30% free area, although other sizes and distributions are possible, for example the walls can be made of the same Material such as the inner wall 38 can be made. The casing 53 is filled with an acoustic material 56 of the same type as the material described in FIG. 2 and shown at 36. Since the acoustic material 56 becomes wet, its performance is significantly reduced, the material is filled into a water-impermeable cover 57, for example made of plastic foil or film material such as MELIKEIX (registered trademark), which does not affect the sound absorption very much ₈ but the penetration of water into the material 56 prevented.

The sound attenuation device of FIG. 3 is similar to that described in connection with FIG. The sound rising in the ear 25 penetrates through the perforated wall 54- in cL & s soundproofing material 56, where a rope is instantly absorbed by the material

630031/0641

GARKIEH DHXSYS 7370/80

3000942

Noise passing through is reflected back into the material on the inner surface of the housing wall 50, where it is further reduced. Also using this construction, noise level reductions of 3 dB (A) have been achieved} by varying the density and composition of the sound-absorbing material 56 can be selective
Frequencies are absorbed. Generally speaking, very dense material is effective for absorbing low frequencies and low density material is used to absorb the higher frequencies} therefore, a mixture of high and low density material is used for optimal performance.

The waterproof cover shown in Fig. 3 inevitably causes a certain, albeit slight, attenuation of the sound-absorbing properties of the acoustic
Materials 56. The use of this sheath can, however, be replaced by the use of complicated shapes of perforated sheets to form the downward
extending walls 54 of the outlet tubes 25. An example of the use of such a material is shown in FIG.

In Fig. 4 · the walls 5 ^ - of pipe 25 with
Sheet metal 60 provided with openings is formed by the
openings originally as short horizontal ones, in different

030031/0643

BATH ORIGINAL

GABBIER DBYSYS 7370/80

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Set vertical row arranged slots are formed. The metal between the slots is then deformed, to enlarge the slots and form a series of js & juxtaposed plates 61, of which each extends over the corresponding opening 62. The lower edge of each plate 61 extends into the interior of the drilling walls beyond the relevant opening 62.

During the operation of the cabin, this in pipe 25 downward flowing water through the overhanging lower edges of the plate 61 to penetrate the wall 54- prevented.

As a result, the protective cover 57 (FIG. 3) can be omitted. It will also be understood that the downwardly directed openings 62 also help the upward through the pipe 25 to intercept sound.

Other forms of perforated sheet metal can also be used for the walls of the tube 25. E.g. Plates that are slotted similar to plate 61 and then bent so that they are overhanging semicircular "eyelids" above each slit and similar semicircular indentations form under each slot that run in opposite directions.

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CJLKHIER DRYSXS 7370/80

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It pretends that there are variations in the embodiments described here with reference to the drawings are possible. This is not the case, for example essential that jacket 50 and muffler material go all the way around pipe 25; they can instead walk only partially around the pipe 25, e.g. on two opposite sides, with only the relevant wall parts being perforated.

In this form they can be used, for example, for an outlet construction which is in the form of a continuous Slot with spaced down sidewalls instead of a series of Have outlet pipes.

Instead of the individual in conjunction with Pig. 1 and 2 described silencers 33 can elongate baffles can be used with a channel-shaped cross-section, either parallel to the longitudinal axis of the cabin or run across it.

These baffles can, for example, comprise an inverted U-profile, the open side of which has the outlet slots or pipes opposite. This open side can be penetrated by a bottom wall of perforated sheet metal, as shown at 54 in FIG. 3Tig. or at 38 in Eig. 2 is shown to be closed,

Ö30031 / 0643 ^BAD

tmd can be the space between the top and bottom wall then filled with the soundproofing material.

The underside of the muffler or baffle plate can be shaped to minimize airflow Offers resistance.

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030031/0643

GAHEIEK DEYSIS 7370/80

Claims (1)

Patent claims: 1. ^ A parbo spray booth consisting of a clad, a space bounding the work area, a perforated Work floor, a device for supplying air to the work area and for manufacturing a flow of air from the work area down through the perforated floor, a device for Rinsing the sub-floor with a rinsing liquid and one or more openings in the sub-floor which the rinsing liquid and the air are drawn off can, characterized in that a sound attenuation device for lowering the noise level installed under the perforated floor within the work area while the cabin is in operation which comprises the following parts: sound-reflecting baffles (34,50) and on at least one of their "surfaces attached sound-absorbing material (36, 50). 030031/0643, OAHEIER DHYSIS 7370/80 2. A paint spray booth according to claim. 1, characterized in that that the sound-reflecting baffle plate is between the work floor and the sub-floor above the entrance baffle plate (34) attached to the opening or openings in the sub-floor, and the sound-absorbing Material comprises a layer of acoustic material (36) against which the or the Openings opposite surfaces of the baffle plate (34 ·) is held. 3. A "paint spray booth according to claim 2, characterized in that that the baffle comprises a reverse channel-shaped part and the acoustic material in this channel is housed 4-, An Ifarb spray booth according to claim 3 »characterized in that that a number of these reversed channel-shaped parts at a distance from each other in an im essential horizontal plane is attached between the work floor and the sub-floor. 5. A paint spray booth according to claim 4, characterized in that that each channel-shaped part is tilted about its longitudinal axis in order to resist the air flow from the work floor to the opening or openings in the sub-floor. 030Q31 / GGA3
BATH ORIGINAL 6. A paint spray booth according to claim 2, characterized in that that a number of outlet openings are provided in the ühterboden at certain intervals, and that the sound attenuation device has several one © ζeine Comprises silencers (33), each of which is located above a corresponding outlet opening, and the baffle plate the outer housing (34 ·) of the or each muffler comprising one at its base limited open space, the cross-section of which tapers upwards, with the addition of the acoustic material (36) is housed within this room. 7. A paint spray booth according to claim 6, characterized in that that this housing (3 * 0 has the shape of a cone or has a truncated cone. 8. A spray booth according to claim 6, characterized in that that this housing (34 ·) is pyramidal. 9. A paint spray booth according to one of the preceding Claims, characterized in that the sound-absorbing material through a lower wall part (38) made of perforated sheet metal is held in its position on the sheet metal. 031/0643 BATH ORIGINAL 10. A paint spray booth according to any one of claims 2 to 9, characterized in that a liquid supply device (41) for rinsing the outer surfaces of the baffle plate or plates with cleaning liquid during the operation of the booth is provided in order to prevent contamination with paint particles. 11. A paint spray booth according to claim 1, characterized in that that the edges of the opening or openings in the subfloor in an outlet construction with after end downward wall parts (46) and that the baffle device comprises a baffle plate (50) which has a certain distance from at least one of the wall parts and next to at least one of the wall parts runs, the sound-absorbing material (56) in a space between at least this one wall part and housed the baffle and this at least one wall part with openings (55) for the Passage of the sound is provided. 12. A paint spray booth according to claim 11, characterized in that that the sub-floor is formed with an opening in the form of a continuous slot, its 8AD ORIGINAL ' GABBIER DEISIS 7370/80 Longitudinal edges terminate in a pair of continuous bottom wall parts made of perforated sheet metal, and thereby ₈ that a baffle plate is provided which is mounted at a distance from each wall panel and parallel to it extends in a substantially vertical plane from the bottom of the underbody, with the longitudinal Channels between the wall parts and the baffles are filled with the acoustic material. 13. A spray booth according to claim. 11, characterized in that that the sub-floor is formed with a plurality of spaced openings, each of which ends in an outlet structure with an outlet pipe (25) with walls (4-6) going downwards and that the Impingement device comprises an outer jacket (49) surrounding at least a portion of the wall surface of the tube, the acoustic material (56) then lying in the space (53) between the pipe walls and the jacket. . A spray booth according to claim 13, characterized in that that each outlet pipe and the jacket in question has a round cross-section and pipe and jacket are arranged coaxially. 030031/06 ^ 3 GARBIER DRYSIS 7370/80 _6_ 30008A2 15. A dye spray booth according to claim 13, characterized in that that the outlet pipe has a rectangular cross-section and the jacket around all four sides of the Rohres goes around. 16. A paint spray booth according to any one of claims 11 to 14, characterized in that this space is delimited by one of the lower surface of the sub-floor formed upper wall and a lower extending between at least one wall part and the baffle plate Wall (51). 17. A paint spray booth according to one of the claims 11 to 16, characterized in that the acoustic material is in a casing (57) made of waterproof Material is encased. 18. A paint spray booth according to any one of claims 11 to 17, characterized in that each down going wall is formed from sheet metal (54) which is formed around the openings (62) therein in order to. impede, that the liquid flowing downwards through the opening in question passes through these openings. 030031/064 $ GAHEIER DRYSIS 7370/80 19. An outlet construction for mounting in the underbody of a paint spray booth with a pair of oppositely lying, downwardly directed wall parts which delimit the sides of an opening in the underbody, characterized in that these wall parts (46) are formed from perforated sheet metal and a baffle plate (50) is mounted at a distance from each of these wall parts and runs in substantially the same direction ₉ to delimit a space (53) between the wall parts and the baffle 5 further by accommodating a sound-absorbing acoustic material (56) in this space to dampen the noises going through the openings (55) formed in this wall part. 20. An outlet structure according to claim 19, characterized in characterized that this construction has a tube (25) and the PralüLech a jacket surrounding the tube (4-9) includes. PIPL.-ING. COTU ¹ AD KHCü PATCN ΓΑ U WA LT € 30031/0643