EP0750529B1 - Treatment cubicle and a method of ventilating a treatment cubicle - Google Patents

Abstract

PCT No. PCT/EP95/01837 Sec. 371 Date Dec. 10, 1996 Sec. 102(e) Date Dec. 10, 1996 PCT Filed May 15, 1995 PCT Pub. No. WO95/31292 PCT Pub. Date Nov. 23, 1995A method and apparatus of ventilating a treatment cubicle such as a painting or spraying cubicle used for painting items such as vehicle bodies. Wherein fresh air to be supplied to the cubicle is supplied via an air-permeable ceiling (1); and air supply chamber (2) is provided above the ceiling (1) and communicates with an inlet air chamber (3) which is connected via at least one aperture (4) to a fresh air supply system. The volume of fresh air flowing into the air supply chamber (2) can be regulated by altering the aperture (4). The proposed process is characterized by the fact that at least some of the fresh air drawn into the inlet air chamber (3) is forced to flow in a path parallel to the ceiling (1) for a predetermined distance before passing via the aperture (4) into the air supply chamber (2), while the parameters needed to regulate the fresh air flow are measured in the end region of the directed air stream.

Description

The invention relates to a method for venting a Treatment cabin, especially a painting or Spray booth for painting objects such as Vehicle bodies, in which the to be fed into the cabin Fresh air is supplied through an air-permeable ceiling, an air supply chamber being arranged above the ceiling is that with a fresh air supply system connected supply air chamber via at least one Passage opening is connected and in which the in the Air supply chamber through incoming fresh air Changes in the passage opening flows in a controllable manner.

Furthermore, the invention relates to a processing cabin, in particular a painting and spray booth for painting Items like vehicle bodies, with one over one air-permeable ceiling arranged air supply chamber, which extend essentially over the entire length of the ceiling Cabin extends, and with one with the air supply chamber connected via at least one adjustable passage opening Supply air chamber connected to a fresh air supply system connected.

A processing booth of the type mentioned is from DE 29 32 392 C3 known. In this known cabin Fresh air or processed exhaust air via vertical Supply air lines led into one or more supply air chambers, which in turn via horizontally arranged, adjustable flaps in Through openings with an underlying one Air inlet chamber are connected. The air inlet chamber is there arranged above an air-permeable ceiling of the spray booth.

When fresh air is fed into a treatment booth mentioned type it is for the quality of the coating or Painting the objects to be treated like Vehicle bodies required a high level of uniformity Establish air sink rate in the treatment cabin. Turbulence or cross currents both within and between the different work areas are in the Avoid treatment booth as this affects the quality of the Coating result - due to its negative influence to those arranged in the treatment cabin Paint application devices - deteriorate.

In the known treatment booth is horizontal arranged flaps, which in the through openings of the Supply air chamber to the individual sections of the Air supply chamber are arranged, the desired Fresh air volume supplied in a controlled manner. For removing the exhaust air There are exhaust fans in the floor area of the treatment cabin arranged which the cabin air over a Vacuum paint mist separator.

In the known processing cabin, there is the problem that the setting only with a lot of work and time the desired amount of air supplied in an exact manner can, since it is necessary, first of all by the Air volume on the exhaust air side also the setting for the feed in the individual sections of the feed side as Presetting the basic setting and then using the setting the desired and actual supply air quantities Reach air supply in the cabin. Possibly occurring Changes in the operating conditions require a lot elaborate and time-consuming hiring process, in particular when using supply air dampers that are set manually Need to become. In addition, an accurate measurement of the supply air volume in the known prior art practically impossible because a sensible measurement a sufficiently long inflow length needed, and this in the known processing booths limited height is limited.

There is a technical problem on which the invention is based in a method of ventilating a treatment booth create in which the to be fed into the treatment cabin Fresh air volume can be determined exactly.

This technical problem is solved with a method of ventilation solved a treatment cabin, in which the in the cabin Fresh air to be supplied via an air-permeable ceiling is supplied, with an air supply chamber above the ceiling is arranged with one on one Fresh air supply system connected to the supply air chamber at least one passage opening is connected and in which the amount of fresh air flowing into the air supply chamber Change in the passage opening flows in controllably by at least part of the supplied into the supply air chamber Fresh air quantity in the supply air chamber over a predetermined Length is forced parallel to the ceiling before the forced fresh air in the air supply chamber flows in, and by in the end region of the compulsory leadership for determining the fresh air volume flowing through necessary parameters be measured.

Another technical problem on which the invention is based is to create a treatment booth at which of limited height that flows into the treatment cabin Fresh air volume can be determined very precisely.

This technical problem is having a machining booth one arranged above an air-permeable ceiling Air supply chamber that extends essentially over the entire Ceiling length of the cabin extends over at least one adjustable passage opening with one on one Fresh air supply system connected supply air chamber is connected, solved in that at least one with the Passage opening connected channel over a predetermined Length extends parallel to the ceiling, and that in the end area of the channel at least one measuring device to determine the parameters required to determine the fresh air volume flowing through are arranged.

The invention is based on the idea of distributing the in the fresh air to be supplied to the processing cabin now, not as in the known prior art via vertically arranged Air distribution pipes or channels in the for the Total distribution necessary air supply chamber above the ceiling let it flow in, but the amount of fresh air before it enters the air supply chamber or its divided sections can flow in beforehand parallel to the ceiling lead so that over this predetermined length the fresh air flow flowing through can be determined more precisely before each in the one or more assigned sections of the Air supply chamber can flow.

An advantageous embodiment of the invention provides that an inlet opening of the channel through which the introduced into the supply air chamber Fresh air flows into the duct, partially or entirely extends over the entire width and partially over the height of the supply air chamber.

Through the parallel feed next to or above the Air supply chamber of fresh air is sufficient Measuring section provided without reducing the overall height enlarges.

The predetermined length of the forced guidance of the fresh air is advantageously determined in such a way that an im essentially constant velocity profile of the air flow can train in the positive control, so that the exact Determination of the through the cross section of the positive guidance or Channel fresh air volume passing through is made possible.

Advantageously, those used to calculate the exact Airflow volume necessary parameters such as humidity, Airtightness etc. after the formation of the essentially laminar Velocity profile seen in the flow direction at the end the forced guidance of the fresh air supplied by suitable Determines measuring devices and then the passage opening according to the calculated controlled variable to a predetermined one Value changed. This makes it possible for the first time for one or several sections in the air supply chamber and the underlying areas of the treatment cabin Specify sink rate of fresh air and exactly to be observed without depending on the exhaust air routing supplied fresh air quantity must be iteratively adjusted.

For the first time, it is therefore possible for one or more Sections in the treatment booth Fresh air volume and thus the sink rate automatically can be adhered to exactly by first the inflowing Fresh air volume is determined exactly and accordingly by Example changeable flaps that are in the range of each associated passage openings are arranged, the Flow cross section is changed so that always a predetermined value for the inflowing amount of fresh air is observed.

By the fresh air supplied into the air supply chamber immediately after entering the air supply chamber through a can be deflected relative to the vertical inclined wall the fresh air supplied is in the air supply chamber, without directly hitting the breathable ceiling in which Distribute the air supply chamber or its individual sections and then evenly through the breathable ceiling step through.

Are due to the treatments to be carried out on the Objects - such as vehicle bodies - various Sinking rates of fresh air in individual sections the treatment cabin is desired, it is advantageous that the Air supply chamber in individual sections through partitions is divided, and the supplied into the supply air chamber Fresh air seen side by side or in the inflow direction consecutive positions in different Partial air flows divided and each forced over one suitable length is parallel to the ceiling and only then through associated passage openings in the individual sections flow into the air supply chamber. This ensures that the fresh air volume for each section of the air supply chamber exactly determined and in each case by regulating the associated Openings to a predetermined value independently can be determined from each other.

By seeing the fresh air in the flow direction before or on Beginning of the compulsory guidance parallel to the ceiling predetermined values warmed up, moistened or the like for each section of the air supply chamber or the underlying sections of the treatment cabin individual values such as air sink rate, air volume supply, Humidity and air temperature or the like exactly in can be determined independently of one another in the desired manner.

Advantageously, in an inventive Processing booth, one with the passage opening connected channel parallel to each other over a predetermined length the ceiling extends and the inlet opening of the channel through which the fresh air introduced into the supply air chamber into the duct flows in, partially or entirely over the entire height and Width of the supply air chamber extends in the flow direction Fresh air seen end of the parallel to the ceiling arranged channel arranged at least one control flap the one flowing through the cross section of the channel Fresh air volume based on that measured by the measuring device Control variable that flows into the air supply chamber Fresh air volume constantly at a predetermined value adjust. This will optimally - under Utilization of the available overall height - achieved that in the individual sections or sections amount of fresh air supplied to the air supply chamber exactly a predetermined value can be adjusted because before the Passage opening the measuring equipment exactly the determination of the supplied air flow volume regardless of any allow previous changes in the supply air chamber.

By in the direction of flow of fresh air in the supply air chamber a number of connected and / or connected in series extending parallel to the ceiling over a predetermined length Channels are arranged, each with at least one adjustable through hole are connected and into the Air supply chamber lead into one of the number of channels corresponding number of separate sections by opposite the vertical sloping walls can be divided for the underlying sections of the treatment cabin exactly the Air flow rate or sink rate, that inflowing fresh air volume can be regulated by Example the adjustable flaps in the area in front of the respective through openings depending on the individual measured airflow volumes automatically set be, so that always the predetermined value for each assigned section in the treatment cabin or the Sections in the air supply chamber is observed.

Is very advantageous with the invention Treatment cabin that one in each channel Air humidification and / or heating device is assigned, whereby for every single section in the treatment booth or for each section of the divided air supply chamber in Desired way the air sink rate, the supplied Fresh air volume and its moisture content and / or also whose temperature independently of each other under optimal Utilization of the height is adjustable.

Because the humidifiers and / or heaters for everyone Channel in the supply air chamber are provided separately, despite the change in the characteristic parameters of each Partial air flows into the individual sections of the Air supply chamber are supplied, the air volume for each Section through the measuring devices arranged at the end exactly be determined and each - as already mentioned - the associated passage opening or openings such as for Example adjustable flaps can be changed so that the once specified value exactly for each section in the underlying treatment cabin can be maintained.

By dividing the air supply chamber by partitions, with the direction of flow of fresh air in the Intake air chamber enclose an angle less than 90 ° the fresh air in the individual sections of the divided Air supply chamber evenly roughly parallel to the ceiling deflected and then flows with a more even Sink speed through the air-permeable ceiling in the Treatment cabin. The partitions are advantageously in the air supply chamber and that at the end of the parallel channels in the supply air chamber facing the through opening End walls arranged parallel to each other so that the Air flow is deflected evenly.

By the device according to the invention or The method according to the invention can control the amount of supply air very precisely the entire cabin area can be set by the desired air volume or the air sink rate as Specification is entered and the volume measuring device with the individual measuring devices in connection with a Control device for each control valve accordingly on the sets the required value. This requirement is for the operator the processing cabin can be entered via a control panel, controllable and when using a recording device documentable. The accuracy of the setting options decreases with increasing number of sections per cabin area.

This creates a control system for the air balance in one Treatment cabin created, which is characterized by a simple and automatable handling of the operator and a more exact setting of the Air budget in the cabin allows, which Air conditions within the application area of the cabin due to a more stable air flow with fewer cross flows be improved. Thereby the application of Paint material on a workpiece to be coated relieved and improves the achievable quality of the coating. As a result of the improved quality of the coating, the reduced economic outlay for painting and the rate of workpieces increased in the first painting process properly coated.

The device according to the invention or the invention Process can be used for both wet painting and Powder coating booths can be used.

Fig. 1

einen Längsschnitt durch eine erfindungsgemäße Lackierkabine in schematischer Darstellung, die mit einer Anzahl hintereinandergeschalteter parallel zur Kabinendecke angeordneter Kanäle zur Zuführung von Frischluft ausgestattet ist, und

Fig. 2

einen Querschnitt entlang der Linie II-II nach Fig. 1.

An embodiment is described and explained in more detail below for further explanation and for a better understanding of the invention. It shows:

Fig. 1

a longitudinal section through a paint booth according to the invention in a schematic representation, which is equipped with a number of series-connected channels arranged parallel to the cabin ceiling for the supply of fresh air, and

Fig. 2

a cross section along the line II-II of FIG. 1st

In the embodiment shown in Fig. 1 Spray booth according to the invention is one in different Sections divided by inclined partitions 8 Air supply chamber 2 over an air-permeable ceiling 1 arranged. One runs above the air supply chamber 2 Supply air chamber 3, which is separated by a false ceiling 31 from the Air supply chamber 2 is separated. The supply air chamber 3 is with a fresh air supply system, not shown, connected ensures the supply of fresh air into the supply air chamber 3.

The false ceiling 31 has a number of in the flow direction the fresh air introduced into the supply air chamber 3 consecutive passage openings 4, whereby the Supply air chamber 3 with individual sections of the air supply chamber 2 is connected. The individual sections of the Air supply chamber 2 are covered with the ceiling 1 and False ceiling 31 connected partitions 8 formed; advantageously, as in this embodiment the partitions 8 each with the front edge Passage opening 4 connected and then run in Direction of flow seen inclined to the ceiling 1. In the area in front of the passage openings 4 are adjustable flaps 5 rotatably attached, whereby the flow cross-section to Passage opening 4 out or the passage opening 4 itself is controllably changeable, i.e. the flow rate of the Fresh air in the individual sections of the air supply chamber 2 is adjustable. Below the cabin or the Application area is a paint mist separator and suction device 10 arranged.

In this embodiment, several are parallel to the ceiling 1 running channels 6 one behind the other in the direction of flow the supply air chamber 3 arranged so that their respective Inlet openings 7 perpendicular to the flow of fresh air from the one connected to the supply air chamber 3 Fresh air supply system stand. The respective Inlet openings 7 extend in height and width part of the cross section through the supply air chamber 3, so that some of the fresh air supplied into each channel 6 flows and another part above and / or next to it in the channels 6 behind it can continue to flow. Easily a channel 6 through the false ceiling 31 and a parallel arranged, spaced from it, overlying wall formed, which extends over the entire width of the supply air chamber 3rd extends. This ensures that a partial air flow in each case parallel to the ceiling 1 in a channel 6 and each in channel 6 is essentially constant Forms speed profile so that at the end of the channel 6 shortly before the respectively associated passage opening 4 with the control valves 5 arranged therein by measuring devices 9 flowing through the respective channel cross-section Fresh air volumes can be determined exactly.

The associated fresh air volume then flows through the Passage opening 4 in the associated section of the Air supply chamber 2 above the air-permeable ceiling 1, the inclined partitions 8 the inflowing Redirect fresh air parallel to the ceiling and only then Fresh air evenly vertically down through the air-permeable ceiling 1 flows through and into the respective Sections of the treatment cabin flows.

Advantageously, heating and / or not shown Humidifiers at the beginning of each duct 6 provided so that individually for each section of the Treatment cabin or the individual sections in the Air supply chamber 2 humidifies the air in the desired manner or can be warmed. Then at the end of channel 6 through the measuring devices the inflowing Fresh air volumes exactly determined and the flap 5 in each Passage opening 4 as by a suitable drive Electric motor set that a predetermined value for that inflowing air volumes are precisely maintained.

As shown in Fig. 2, the individual extend Air channels over a portion of the height of the supply air chamber 3, so that only a portion of the inflowing Fresh air volume in the supply air chamber 3 in the individual Sections of the air supply chamber 2 is branched off. Of the Partial airflow is then individual for each section of the Treatment cabin according to the intended temperature, the desired humidity level and also the amount of fresh air to be supplied.

Claims (14)

1. Method of ventilating a treatment cabin, especially a paint or spray booth for painting objects such as vehicle bodies, in which the fresh air to be supplied to the cabin, is supplied via an air permeable ceiling (1), there being disposed above the ceiling (1) an air supply chamber (2) which is connected via at least one admission aperture (4) to an additional air chamber (3) attached to a fresh air supply installation, and in which the amount of fresh air flowing into the air supply chamber (2) may be adjusted (5) by altering the admission aperture (4),
   characterised in that

   at least a portion of the amount of fresh air led into the additional air chamber (3) is forced along a pre-determined distance parallel to the ceiling (1), before the forced amount of fresh air flows into the air supply chamber (2), and

   in the end region of the forced flow of the amount of fresh air, the necessary parameters for determining the volume of fresh air flowing through are measured.
2. Method according to claim 1, characterised in that the distance along which the fresh air is forced parallel to the ceiling (1) in the additional air chamber (3) is determined in that a substantially constant velocity profile of the airstream in the forced flow (6) can be formed.
3. Method according to claim 1 or 2, characterised in that the necessary parameters for calculating the exact volume of the airstream, such as air humidity, air density, are determined by a measuring device (9) after the formation of the substantially laminar velocity profile at the end of the forced flow (6) of the fresh air supplied, seen in the direction of flow, and then the admission aperture (4) is altered to a predetermined value corresponding to the calculated regulating variable.
4. Method according to claim 1, characterised in that that the fresh air supplied to the air supply chamber (2), is deflected by a wall (8) inclined in relation to the vertical, immediately after entering the air supply chamber (2).
5. Method according to one or more of the preceding claims, characterised in that the fresh air supplied to the additional air chamber (3) is forced into positions lying beside and/or behind one another, seen in the inflow direction, and is in each case forced along a suitable distance parallel to the ceiling (1) and then flows through associated admission apertures (4) into individual sections of the subdivided air supply chamber (2).
6. Method according to claim 5, characterised in that that the partial air streams are supplied through the respective admission apertures (4), adjustable individually and independently of one another, into the separate sections of the subdivided air supply chamber (2).
7. Method according to one or more of the preceding claims, characterised in that the fresh air, in the flow direction before or at the beginning of the forced flow parallel to the ceiling (1), is warmed and moistened to predetermined values.
8. Treatment cabin, especially a paint and spray booth for painting objects such as vehicle bodies, with

   an air supply chamber (2), arranged above an air permeable ceiling (1) and extending over the whole length of the cabin ceiling,

   an additional air chamber (3), disposed above the air supply chamber (2), connected to the latter via at least one adjustable admission aperture (4) and attached to a fresh air supply installation,
   characterised in that

   at least one duct (6), connected to the admission aperture (4), extends over a predetermined distance parallel to the ceiling (1),

   at least one measuring device (9) for identifying the parameters which are necessary for determining the stream of fresh air flowing through is disposed in the end region of the duct (6).
9. Treatment cabin according to claim 8, characterised in that an inlet aperture (7) of the duct (6) through which the fresh air introduced into the additional air chamber (3) flows into the duct (6), extends partially or completely over the whole width and partially over the height of the additional air chamber (3).
10. Treatment cabin according to claim 8, characterised in that the measuring device (9) is arranged at the end, seen in the direction of flow of the fresh air, of the duct (6) disposed parallel to the ceiling (1), in order to determine the amount of fresh air flowing through the cross-section of the duct (6), with which measured value the size of the admission aperture (4) may be correspondingly adjusted.
11. Treatment cabin according to claim 8, 9 or 10, characterised in that, in the flow direction of the fresh air in the additional chamber (3), there is disposed a number of ducts (6) switched beside and/or behind one another and extending over a predetermined distance parallel to the ceiling (1), which ducts are respectively connected with at least one adjustable admission aperture (4) and lead into the air supply chamber (2) which is subdivided into separate sections corresponding to the number of ducts (6) by walls inclined in relation to the vertical.
12. Treatment cabin according to one or more of claims 8 to 11, characterised in that there is associated with each duct (6) at least one air humidifying and/or heating device, including their measuring and control systems.
13. Treatment cabin according to claim 8, characterised in that that the partition walls (8) subdividing the air supply chamber (2) enclose with the flow direction of the fresh air parallel to the ceilings (1, 31) in the additional air chamber (3) an angle smaller than 90°.
14. Treatment cabin according to one or more of claims 8 to 13, characterised in that powder coating is carried out in the cabin.

Images