EP2026910A1

EP2026910A1 - Painting system

Info

Publication number: EP2026910A1
Application number: EP08715724A
Authority: EP
Inventors: Gerd Wurster
Original assignee: Individual
Current assignee: Duerr Systems AG
Priority date: 2007-03-02
Filing date: 2008-02-11
Publication date: 2009-02-25
Anticipated expiration: 2028-02-11
Also published as: DE102007015150A1; US20100101489A1; JP5302223B2; EP2026910B1; WO2008107056A1; JP2010520037A

Abstract

The invention discloses a painting system having a spray cabin (12) with an application area (14) for spray painting parts (30), having at least one auxiliary area (16, 18) separated from the application area (14), having an air supply and an air exhaust, wherein a first air supply (20) is provided for the application area (14), said air supply being fed through a climatizing unit (36), and wherein a second air supply (22, 24) separated from the climatizing unit (36) is provided for the auxiliary area (16, 18). Furthermore, an inlet gate and an outlet gate which raise outwards can be provided for use with a pass-through spray cabin.

Description

paint shop

For high-quality results in spray painting spray booths of paint shops are usually air-conditioned. Air conditioning requires cooling to eliminate atmospheric moisture and then heating to operating temperature again. As a result of the large air flow rates that are necessary, this results in a significant energy consumption.

The object of the invention is to provide a paint shop and a method for painting parts, whereby the energy consumption can be reduced. This object is achieved by a painting installation having a spray booth with an application area for painting parts, with at least one auxiliary area separated from the application area, with an air supply and an air suction, wherein a first air supply is provided for the application area, which is led via an air conditioning unit is, and wherein a second of the air conditioning device separate air supply is provided for the auxiliary area.

The object of the invention is further achieved by a method for spray painting parts in a spray booth, in which the parts are painted in an application area of the spray booth and in the spray booth a separate from the application area auxiliary area is provided, the application area is supplied with conditioned supply air, and wherein the auxiliary area is supplied with separate supply air.

The object of the invention is completely solved in this way.

Since according to the invention only the application area of the spray booth, in which the actual spray painting takes place, is supplied with conditioned supply air, the remaining auxiliary areas of the spray booth, in which optionally additional units, such as painting robots, lifting devices and the like, are arranged, can be supplied with supply air, which not air conditioned. In this way, the volume of air to be conditioned is considerably reduced compared to the conventional full air conditioning in the prior art, which is associated with a corresponding energy saving.

In the context of this invention, "air conditioning" is understood to mean an air treatment which always comprises cooling and associated dehumidification. A simple "air conditioning" such as by heating or mixing with other air is not included.

Air conditioning is considered necessary to be able to actually achieve good painting results. In accordance with a further embodiment of the invention, at least one guide element is provided between the application region and the at least one auxiliary region for optimizing the flow of air in the transition region between the application region and the auxiliary region.

In this way, turbulences, which are inevitably caused by different airtightness, moisture contents or temperatures of the adjoining merged air flows, can be reduced.

According to a further embodiment of the invention, exhaust air from the spray booth is at least partially performed in recirculation mode via at least one separator, and at least a portion of the circulating air of an exhaust air purification device, such as a thermal afterburning, preferably a regenerative afterburning, or solvent recovery supplied.

In this way, the use of solvent-based lacquers facilitates concentration of the solvents to a range of up to about 10 g / m ³ (typically about 3 g / m ³ ) and suitable exhaust air purification by thermal afterburning.

According to a further embodiment of the invention, the second air intake at least partially sucks recycled air from the spray booth.

In this way, the advantages associated with concentration can be used for the application area.

In an alternative embodiment of the invention, the second air supply can also be supplied at least partially with ambient air or fresh air.

Also in this case, the energy saving achieved according to the invention is achieved. According to a further embodiment of the invention, a partition with an application opening for spray application is provided between the application area and the auxiliary area.

This measure has the advantage that an operator for a manual spray painting can stand in the auxiliary area and can be supplied with separate supply air, which is preferably fresh air. Through the application opening, the spray application can be carried out in a suitable manner.

In this case, a pressure gradient preferably arises between the auxiliary region and the application region, so that an air flow results from the auxiliary region to the application region.

In this way, the operator standing in the auxiliary area is protected against increased pollutant concentration of the circulating air flow in the application area.

According to a further alternative of the invention, the spray booth has a separate, preferably movably arranged work cabin which is connected to the application area via an application opening.

This embodiment is particularly advantageous in the painting of large parts. The movement of the work cabin can e.g. in the vertical direction and / or in the horizontal direction or as a rotation.

The partition between the application area and the auxiliary area is designed to be movable in accordance with a further embodiment of the invention.

Also, the application opening can be changeable or movable.

In this way, there is a great deal of flexibility. As already mentioned, the second air supply for the auxiliary area can be at least partially supplied with fresh air.

This is particularly advantageous when the auxiliary area is provided for access by a worker.

In an additional development of the invention, air filters with different qualities are provided for the air conditioning unit and for the air supply for the auxiliary area, preferably finer qualities for the air conditioning unit and coarser qualities for the second air supply for the auxiliary area.

For example, the qualities F5 and F9 could be used in the air-conditioning unit, while only F5 could be used for the auxiliary area.

In this way, the pressure loss caused by the filters in the auxiliary area is reduced, which leads to energy savings and saves filter costs.

According to a further embodiment of the invention, a monitoring device for monitoring the solvent concentration is provided.

In this way, it is possible to further reduce the amount of air for the exhaust air purification device to a level that is necessary to ensure compliance with a maximum solvent concentration.

According to a further embodiment of the invention, a control device for controlling the proportion of air, which is supplied to the exhaust air purification device, is provided.

The proportion of air which is fed to the exhaust air purification device is hereby preferably controlled as a function of the solvent concentration in the region of the second air supply. In this way, the exhaust air purification device (eg regenerative afterburning) supplied exhaust air is reduced to the necessary level. In this way, there is a further energy and cost savings.

Furthermore, it is possible in this case to control the solvent concentration in the air fed to the exhaust air purification device such that the solvent concentration is between 2 and 20 g / m ³ , preferably between 2 and 10 g / m ³ , particularly preferably between 2 and 5 g / m ³ is held.

In this way, a regenerative afterburning for exhaust air purification can be used, which is operated in the autothermal range, i. that only the solvents contained in the exhaust air are sufficient to maintain the combustion. This makes a particularly energy-saving process possible.

At a sufficiently high solvent concentration of, for example, 10 g / m ³ , instead of afterburning, the exhaust air can also be passed over a "cold trap" and the solvent fraction can be separated off by condensation.

This is particularly inexpensive and has the advantage that the condensate is reusable.

According to a further embodiment of the invention, the monitoring device is designed to measure the solvent concentration, and the control device has a valve which is controlled as a function of the solvent concentration. This may be, for example, a controllable flap or a controllable fan.

In this way, the control of the exhaust air purification device supplied exhaust air can be ensured in a simple and accurate manner. According to an alternative embodiment of the invention, the monitoring device is designed to monitor the amount of introduced solvent and the control device for controlling the proportion of the circulating air, which is supplied to the exhaust air purification device, depending on the introduced amount of solvent.

For monitoring the amount of solvent, for example, the amount of liquid sprayed in the spray booths can be used.

In this way, can be dispensed with a solvent sensor, resulting in a particularly simple and inexpensive design.

According to a further embodiment of the invention, the spray booth is sealed off to the outside by doors or inlet and outlet locks.

By such a measure, the exhaust air amount can be further reduced. For long parts, double doors can be installed before and after the spray booth.

The double doors are preferably each coupled with a lock such that only one outer or one inner door can be opened.

According to a further embodiment of the invention, a spray booth according to the invention comprises a spray booth with an application area for painting parts, an air supply and an air suction, with a conveyor for conveying parts through the spray booth, as well as an inlet lock and an outlet lock, the locks as with connected to the interior of the spray booth channels are formed, which run obliquely upward to the outside. Such an embodiment of the invention also leads to energy savings when the spray booth is not equipped with separate air ducts for an application area and an auxiliary area.

In conventional flow spray booths, the conveyor usually runs horizontally. At the inlet end and at the outlet end, no special measures have been taken to achieve air separation between the conditioned cabin air and the non-conditioned outside air. This leads to significant energy losses at the inlet and outlet ends. There is also the risk of solvent losses and the risks of dirt contamination.

According to the invention, the amount of air entering this way is significantly reduced by the special design of the locks at the inlet and outlet ends, so that the total air turnover is reduced, which is associated with corresponding savings in energy and costs.

This exploits the fact that the conditioned air inside the spray booth is usually cooler and thus heavier than the ambient air. This significantly reduces the amount of air entering or leaving the locks.

It is also possible to arrange a plurality of spray booths in succession, which are coupled via a channel through which the conveyor extends. An inlet lock is then provided on the inlet side of the first spray booth and an outlet lock on the outlet side of the last spray booth.

According to a further embodiment of the invention, the locks are closed to the outside in each case by a lower edge, and wherein the lower edge are arranged at a level which is at least at the level of the conveyor on which the conveyor extends within the spray booth. This results in a particularly effective reduction of the air exchange at the locks.

According to a further embodiment of the invention, air-conditioning devices or ventilation devices are provided with filters, which can be flowed through in the vertical direction.

This can be compared to the usual in the art filter installation in the horizontal direction save considerable costs, since the filters can be used from above, without special reinforcements as in horizontal filter installation are necessary.

It is understood that the features of the invention mentioned above and those yet to be explained below can be used not only in the particular combination indicated, but also in other combinations or in isolation, without departing from the scope of the invention.

Further features and advantages of the invention will become apparent from the following description of preferred exemplary embodiments with reference to the drawing. Show it:

Figure 1 shows a first embodiment of a paint shop according to the invention in a schematic representation;

Figure 2 shows a modification of the paint shop of Figure 1;

FIG. 3 shows a further embodiment of a painting installation according to the invention;

Figure 4 is a plan view of a spray booth according to the invention from above in a highly simplified schematic representation; 5 shows a further embodiment of a spray booth according to the invention in a cross-sectional representation;

FIG. 6 shows a further modification of the painting installation according to FIG. 3;

FIG. 7 shows a further modification of the painting installation according to FIG. 1;

8 shows a partial section through the spray booth with continuous conveyor according to

FIG. 1 in the region of an inlet lock;

Figure 9 shows another embodiment of a paint shop with two successively arranged spray booths, which are provided with an inlet and an outlet lock;

Figure 10 shows a further modification of a paint booth according to the invention with two locks, which are secured by double doors;

FIG. 11 shows a simplified illustration of a filter for an air conditioning device or ventilation device according to FIG. 1, which is designed as a vertically permeable surface filter and FIG

Figure 12 is a simplified representation of a filter for an air conditioning device or ventilation device according to FIG. 1, which is designed as a vertically flow-through pocket filter.

A first embodiment of a paint shop according to the invention is designated in Figure 1 in total with the numeral 10.

The painting installation has a spray booth 12, which is divided into three areas, a centrally arranged application area 14, in which parts 30 are spray-painted and in two lateral auxiliary areas 16, 18, in which auxiliary equipment for painting, such as robots, hoists or the like, are provided.

The transition between the application region 14 and the auxiliary regions 16, 18 can be seen in more detail by way of example from FIG. Thus, there is a corridor 52 which extends longitudinally through the spray booth 12 and can be moved through the parts 30 along a path predetermined by a conveyor, as indicated by the arrow 54. Within the spray booth 12, two robots 60, 62 are arranged, of which one 60 in the auxiliary area 18 and a second 62 in the auxiliary area 16. In FIG. 4, a first application area 56 within the corridor 52, which is operated by the robot 62, and a second application area 58, which is operated by the robot 62, are shown in dashed lines. These application surfaces 56, 58 are located within an application area 14 and are supplied with conditioned air from above via a separate air supply 20, which is guided via an air-conditioning device 36 (see FIG. The remaining auxiliary areas 16, 18, in which the robots 62, 64 and possibly further auxiliary units are accommodated, are supplied via a separate air supply 22 or 24 with separate supply air, which is supplied via a recirculation device 38 according to FIG.

Due to this separate supply of the application area 14 and the auxiliary areas 16, 18 with supply air, the energy-intensive air conditioning in the application area 14 can be limited to the actual necessary air volume, while the remaining areas of the spray booth, which are referred to as auxiliary areas 16, 18, with separate supply air be supplied, which is not air-conditioned or only partially air-conditioned. FIG. 1 shows by way of example a recirculation device 38 for this purpose.

The recirculation device 38, via which the air supply 22, 24 of the auxiliary areas 16, 18 is supplied with supply air, generally has a fan, a filter and possibly an additional heater. The supply air supplied separately into the spray booth 12 at 20, 22 and 24 exits from above into the interior of the spray booth 12, which takes place via blowing surfaces, which are indicated schematically in FIG. As known in the art, these blowing surfaces can be configured for example as filter ceilings, but also as a grid, nozzles, perforated plates or the like. Here, suitable materials for a uniform air distribution are used.

Adjacent to the blowing surfaces 25 in the transition regions between the application area 14 and the auxiliary areas 16, 18 arranged guide surfaces 26, 28, which are shown in Figure 1 as a movable flaps. By means of a suitable adjustment of the guide surfaces 26, 28, turbulences that result as a result of the different air quality between the application region 14 and the auxiliary regions 16, 18 can be minimized. Preferably, the supply air supplied to the application area 14 and the auxiliary areas 16, 18 from the air conditioning unit or from the air conditioning unit is controlled in such a way that the same or similar air speeds result. In addition, the same possible temperatures and low air density differences are sought, so as to achieve the result as possible a rectified, laminar flow through the spray booth from top to bottom. In this way, high quality finishes can be achieved.

The exhaust air of the spray booth 12 is recycled and for this purpose via a scrubber 32 (eg venturi scrubber) and a post-scrubber 34 out. From the post-scrubber 34, the exhaust air passes to the air conditioning device 36, in which it is adjusted to the desired temperature and relative humidity. Another part of the exhaust air passes to the recirculation device 38, from which the air supply 22, 24 for the auxiliary areas 16, 18 is fed. A portion of the exhaust air is branched off after the recirculation device 38 and an exhaust air purification system 40, preferably supplied in the form of a thermal afterburning, to then be discharged as practically pollutant-free exhaust air to the environment. The air conditioning device 36 used is basically known in the prior art. It usually has a pre-filter, a drain cooler, a heater and a blower. Further, a suitable control is provided to adjust the air supplied to the spray booth to a suitable temperature (eg 24 ° C) and a suitable relative humidity (eg 65%).

Instead of the aforementioned conventional Venturi deposition air conditioning, dry separation air conditioning may also be used.

A comparison with the embodiment of Figure 1 slightly modified embodiment of a paint shop according to the invention is shown in Figure 2 and generally designated by the numeral 10a. In this figure, as well as in the following figures, corresponding reference numerals are used for corresponding parts.

The painting installation 10a has a spray booth 12a which differs from the spray booth 12 explained above with reference to FIG. 1 only in that the guide surfaces 26a, 28a between the application area 14 and auxiliary areas 16, 18 are rigid.

Further, the spray booth 12a is not operated with circulating air as in the aforementioned embodiment, but is supplied with ambient air via the air conditioner 36 and an air feeder 42, respectively.

A further modification of a painting installation according to the invention is shown in FIG. 3 and indicated overall by the numeral 10b.

In this case, the spray booth 12b has an application area 14 and an auxiliary area 16, which are separated from one another by a partition wall 44, wherein an application opening 46 is formed in the partition wall 44. An operator 51 standing in the auxiliary area 16 can spray-paint parts 30, which are located in the application area 14, by means of a spray gun 49. The air supply 24 for the application area 14 is in turn via an air conditioning device 36. In contrast, the air supply 20 is fed to the auxiliary area 16 with fresh air via a supply air 42. In this case, a pressure gradient between the auxiliary region 16 and the application region 14 is preferably set, so that the operator 51 is protected from pollutant-laden circulating air of the application region 14 by an air flow into the application region 14. Behind the air conditioning device 36, a thermal post-combustion 40 is preferably additionally connected to clean solvent-laden circulating air and then to be able to deliver to the environment. The supply air flow for the auxiliary area 16, which is supplied via the supply air 42, may be such that it corresponds to the exhaust air flow discharged via the thermal afterburning. For example, the thermal afterburning 40 may be designed for 5000 m ³ / h and the same amount supplied via the air supply device 42 in the auxiliary area 16. In the auxiliary area 16, a dry separation 48 can be provided below, which makes it possible to dispense the exhaust air via a blower 50 to the environment.

However, an exhaust air for the auxiliary area 16 can also be completely dispensed with, provided that the supplied supply air is conducted completely via the application opening 46 into the application area 14.

The auxiliary area 16 can also be designed as a ventilated hall in which the operator 51 stands and which is in communication with the application area 14 via the application opening 46.

FIG. 5 shows an embodiment of a spray booth that is slightly modified from the embodiment according to FIG. 4 and designated overall by 12c.

In this case, a robot 64 is shown in the auxiliary area 18 in order to use it to paint parts 30, which are conveyed through the application area 14 by means of a conveyor 68. A modification of the previously explained with reference to Figure 3 paint shop is shown in Figure 6 and designated overall by the numeral 10d.

The only difference from the embodiment according to FIG. 3 is that the spray booth 12d comprises a movable work cabin 70 in which an auxiliary area 16 for an operator is provided. The movable work cabin 70 has the application opening 46 and is above it with the application area 14 in connection. The work cabin 70 has no own exhaust air. The work cabin 70 can be moved approximately in the vertical direction and / or in the horizontal direction, with the application opening 46 being coupled to the application area 14 via suitable closing devices and seals.

FIG. 7 shows a further embodiment of a painting system according to the invention which is modified with respect to the embodiment according to FIG. 1 and is indicated overall at 10e.

The paint shop 10e has a spray booth 12 with an application area 14 and two auxiliary areas 16, 18 according to FIG. The application area is supplied by an air conditioning device 36 via an air supply 20 as in FIG. 1, while the auxiliary areas 16, 18 are supplied by a recirculation device 38 via a separate air supply 22, 24. Both the air conditioning device 36 and the recirculation device 38 are partially fed in the circuit of the exhaust air of the spray booth 12, which is cleaned via a washing device 32 and a post-washer 34. In contrast to the embodiment according to FIG. 1, the solvent concentration of the air supplied by the air-conditioning device 38 via the air supply 22, 24 into the auxiliary regions 16, 18 is monitored and the proportion of air diverted to the thermal afterburning 40 is automatically controlled as a function of the solvent concentration controllable valve 82 controlled. Otherwise, the embodiment corresponds to FIG. 1. In FIG. 8, the spray booth according to FIG. 1 is shown enlarged in a partial longitudinal section in the area of the inlet side. In this case, the cutting line runs directly through the application area 14. The spray booth designed as a pass-through cabin has an inlet lock 92 and an outlet lock (not shown) of identical construction. The inlet lock 92 and the outlet lock are formed as channels, which open obliquely from above into the interior of the spray booth 12. A conveyor 90 runs parallel along the upper inner side of the inlet lock 92, ie obliquely from above into the spray booth 12. Within the spray booth 12, the conveyor 90 runs horizontally immediately below the blowing surfaces 25. At the outlet side of the conveyor 90 runs again parallel along the upper inside of the outlet lock slanted upward.

The lower edge 94 of the inlet sluice 92 (and correspondingly also the outlet sluice) is at the highest possible level, preferably at least at the level of the conveyor 90 within the d-r spray-cabin-l-2τ

Due to the high-level inlet and outlet locks, the cooler and consequently heavier air within the locks 92 or the spray booth 12 "remains" as a result of the air conditioning, so that an ingress of air from warmer air is significantly reduced from the outside. Thus, the air exchange at the openings of the sluices 92 is significantly reduced, whereby the required air flow rate is significantly reduced. Of course, this applies regardless of whether the spray booth 12 as described here has a separately supplied application area 14 and auxiliary areas 16, 18 or whether the spray booth 12 is conditioned altogether.

FIG. 9 shows a modification of the embodiment according to FIG. Here, two spray booths 12, 12e are arranged one behind the other and coupled together by a channel 97, through which a conveyor extends. At the inlet end of the first spray booth 12, an inlet sluice 92 is provided according to Figure 8, while at the outlet end of the second spray booth 12 e sluice 96 is provided according to Figure 8. FIG. 10 shows a spray booth 12f, which communicates with a first lock 98 on a first side and a second lock 102 on the opposite side. At the spray booth 12f and at the lock 98 and 102 respectively doors 99, 100 and 103, 104 are provided, which are controlled so that only ever an outer door 100, 104 or an inner door 99, 103 can be opened. This minimizes the air exchange.

FIG. 11 shows a section of a surface filter for the air-conditioning device 36 or the air-recirculation device 38 according to FIG. 1 in simplified form. It is a surface filter with a filter material 106, which also rests on a support surface 107 and can be flowed through in the vertical direction.

As a result of the vertical arrangement fewer reinforcing measures are required than in the usual horizontal arrangement in the prior art. Also paint residues can drain or drip better down.

Figure 12 shows an embodiment of such a filter 105a in the form of a pocket filter or bag filter 106 which is held on a receptacle 107 and is also held in a receptacle 107.

Claims

claims

A paint shop with a spray booth (12, 12a, 12b, 12c, 12d) having an application area (14) for painting parts (30), with at least one auxiliary area (16, 18) separate from the application area (14), with an air supply and an air exhaust, wherein for the application area (14) a first air supply (20) is provided, which is guided via an air conditioning device (36), and wherein for the auxiliary area (16, 18) a second of the air conditioning device (36) separate air supply (22, 24) is provided.

2. Painting system according to claim 1, wherein between the application area (14) and the at least one auxiliary area (16, 18) at least one guide element (26, 28; 26a, 28a) for aerodynamic optimization of the air currents in the transition region between the application area (14) and Auxiliary area (16, 18) is provided.

3. paint shop according to claim 2, wherein the at least one guide element (26, 28) is adjustable, preferably designed as a movable flap.

4. Painting installation according to one of the preceding claims, in which exhaust air from the spray booth (12; 12b; 12c; 12d) is guided at least partially in recirculation mode via at least one separation device (32, 34), and at least part of the circulating air of an exhaust air purification device (40 ), preferably in the form of a thermal, preferably a regenerative afterburning or a solvent recovery, is supplied.

5. Painting installation according to one of the preceding claims, wherein the second air supply (22, 24) at least partially recycled air from the spray booth (12; 12a, 12b, 12c, 12d) is supplied.

6. Painting plant according to one of the preceding claims, wherein the second air supply (22, 24) at least partially ambient air is supplied.

7. Painting installation according to one of the preceding claims, wherein between the application area (14) and the auxiliary area (16, 18) is provided a partition wall (44) with an application opening (46) for spray application.

8. painting installation according to one of claims 1 to 6, wherein the spray booth (12d) has a separate, preferably movably arranged work cabin (70) which communicates via an application opening (46) with the application area (14).

9. paint shop according to claim 7 or 8, wherein the partition wall (44) is movable.

10. Painting installation according to claim 7, 8 or 9, wherein the application opening (46) is variable or movable.

11. Painting system according to one of the preceding claims, wherein the second air supply (22, 24) for the auxiliary area (16, 18) is at least partially fed with fresh air.

12. Painting installation according to one of claims 7 to 11, wherein between the application area (14) and auxiliary area (16, 18) a pressure gradient, so that an air flow from the auxiliary area (16, 18) to the application area (14) results.

13. Painting installation according to one of the preceding claims, wherein for the air conditioning device (36) and for the air supply for the auxiliary area (16, 18) different air filters of different qualities are used, preferably finer qualities for the air conditioning device (36) and coarser qualities for the second air supply (22, 24) for the auxiliary area.

14. Painting installation according to one of claims 4 to 13, with a monitoring device for monitoring the solvent concentration in the region of the second air supply (22, 24) for the auxiliary area.

15. Painting installation according to one of the preceding claims, with a control device for controlling the proportion of air, which is supplied to the exhaust air purification device (40).

16. Painting system according to claim 15, wherein the monitoring device is designed to measure the solvent concentration and the control device has a valve that is controlled as a function of the solvent concentration.

17. Painting system according to claim 15, wherein the monitoring device is designed to monitor the amount of solvent introduced and the control device for controlling the portion of the circulating air, which is supplied to the exhaust air purification device (40), is formed as a function of the introduced amount of solvent.

18. Painting installation according to one of the preceding claims, wherein the spray booth (12) is sealed off to the outside by doors (99, 100, 103, 104) or inlet and outlet locks (92, 96).

19. The paint shop according to claim 18, wherein the spray booth has a lock (98, 102) with double doors (99, 100, 103, 104) which are controlled such that only one outer door (100, 104) or one inner door is always open Door (99, 103) can be opened.

20. Painting system with a spray booth (12) with an application area (14) for painting parts (30), with an air supply and an air extraction, with a conveyor (90) for conveying parts (30) through the spray booth (12), in particular according to one of the preceding claims, with an inlet lock (92) and an outlet lock, wherein the locks (92) are formed as connected to the interior of the spray booth (12) channels which run obliquely upward towards the outside.

21. A paint shop according to claim 20, wherein the locks (92) are outwardly terminated by a lower edge (94), and wherein the lower edges (94) are arranged at a level which is at least at the level of the conveyor (90 ) on which the conveyor (90) extends within the spray booth (12).

22. Painting system according to one of the preceding claims, wherein the air conditioning means (36) or ventilation means (38) with filters (105, 105a) are provided, which can be flowed through in the vertical direction.

23. The paint shop according to one of claims 4 to 22, wherein the proportion of the exhaust air purification device (40) supplied air is controlled such that the solvent concentration in a range between 2 and 20 g / m ³ , preferably in a range between 2 and 10 g / m ³ , more preferably in a range between 2 and 5 g / m ³ .

24. Painting system according to claim 23, wherein the exhaust air purification device (40) has a cold trap for the condensation of solvent.

25. A method for spray painting parts in a spray booth, in which the parts (30) in an application area (14) of the spray booth (12; 12a; 12b; 12c; 12d) are painted and in the spray booth (12; 12a; 12b; 12c, 12d) an auxiliary region (16, 18) separate from the application region (14) is provided, wherein the application area (14) is supplied with conditioned supply air, and wherein the auxiliary area (16, 18) is supplied with separate supply air.