Patent EA-000935-B1 (EA)
Title: Spraying booth and circulation system for a working chamber
Inventor: WALTI ROBERT
IPC: B05B15/12
Filed: 1997-12-15
Abstract: 1. A booth for applying coatings by spraying for treating articles, in particular, vehicles, comprising an inner chamber (1a) with side walls (4, 5) having at least one closable opening (6) for gates, ceiling (3) and the floor surface (2), and a an air feeding device (20) for air supply to the inner chamber (1a) and air discharge from the inner chamber (1a), wherein air supplied can be conditioned so that its temperature lies in a desired temperature range and air pollution limit can be ensured for a person working in the inner chamber (1a), characterized in that said inner chamber is provided with a displacement device (10) with a receiving region for an article, in particular vehicle, wherein the receiving region is mounted enabling to displace, at least, across longitudinal direction of the chamber that can be moved in at least one direction, an air exhaust ventilation system is arranged in the receiving region, having at least one air supply duct (15a), and the required booth width or the booth length in the longitudinal direction and correspond mainly to the sum of width required for working and the width or the length of the article or the vehicle being sprayed. 2. The booth for applying coatings by spraying as claimed in claim 1, characterized in that the receiving region comprises the first and, if necessary, perpendicular to it the second guide device (9, 11, 12-14) so that the receiving region can displace essentially by any way inside the chamber (1), wherein the receiving region comprises preferably two flat beams for receiving the vehicle, the beams are spaced corresponding to the vehicle gauge, and, preferably, the first guide device (9, 11) comprises at least two parallel rails (9) passing across the longitudinal axis of the chamber and a roller bogie (10), and, in particular, the second guide device (12-14) comprises at least one, preferably, two pair of rails fixed to the roller bogie (10), wherein for movement between the pair of rails and the flat beams (14) rollers are provide (13) arranged on the paur of rails or on the flat beams enabling to rotate. 3. The booth for applying coatings by spraying as claimed in claim 1 or 2, characterized in that the exhaust ventilation system is arranged above the chamber floor, preferably a housing (15) of the exhaust ventilation comprising at least one air supply duct (15a), in particular, a filter (15b) for the used air and a portion (15c) of the exhaust ventilation system, wherein said exhaust system is mounted enabling to displace with the the receiving region, at least, across the direction of the chamber longitudinal axis, and, if necessary, one of the alternatives is provided for: a) the housing (15) of the exhaust ventilation is arranged between two flat beams (14) which constitute a part of the receiving region, wherein said flat beams are mounted enabling to displace towards the housing of the exhaust ventilation, but, if necessary, can be connected with it. b) the duct (15a) passes mainly along all length of the lower side of the exhaust ventilation housing, if necessary, but a plurality of air supply ducts with closing elements can be provided in the housing, and c) a displaceble in at least one direction housing (15) or its portion is (15c) is connected with rigidly mounted to the ventilation unit (20), if necessary, via a flexible hose connection, preferably via a sealed movable connection, wherein, in particular, one duct (15d) of portion (15c) of the exhaust ventilation can displace along a slit-shaped connection opening (16) of the ventilation unit (20), and a gate valve device (17) provides opening of both adjacent to each other ducts ((15d), 16) only in the zone of their closing. 4. The booth for applying coatings by spraying as claimed in claim 1 to 3, characterized in that above the ceiling (3) of the chamber or above the filter (19) for the supplied air is arranged at least one feeding duct for the supplied air and, at least one feeding duct for circulating air (23b, 21b) and in, at least, two, preferably four, if necessary, in six or eight portions of the ceiling having mainly correspondingly equal size, each feeding duct (23b, 21b) comprises at least one connection opening (18) into the inner chamber (1a), wherein connecting ducts (18) are provided with a controllable closing element (18a) and, if necessary, one of the alternatives is provided for: a) a manually-controlled device for switching over in each portion of the ceiling from supply of feeding air to supply of circulating air and vice versa; and b) a controlling device (29) for controlling a means (18b) of element closing communicated with a sensing device to determine an actual working zone, wherein said sensing device can determine the position of the receiving region, but preferably working position or its spraying means. 5. The booth for applying coatings by spraying as claimed in claim 1 to 4, characterized in that the ventilation unit (20) comprises a system of ducts (21, 22, 23) and, at least, three motor-driven fans (21a, 22a, 23a) arranged in three air supply zones (21a', 22a', 23a', wherein a) an exhaust fan (22a) can move a part of the used air from at least one air feeding duct (15a, 18)via a discharge ventilation duct (22) to the outlet opening; b) an air supply fan (23a) can move supplied air via a feeding ventilation duct (23) to, at least one feeding duct (23b) for the feeding duct; and c) a fan (21a) for circulating air can move part of air from at least one air supply duct (15a, 18) via a duct (21) for circulating air to, at least, one feeding duct (21b) for the circulating air. 6. The booth for applying coatings by spraying as claimed in claim 5, characterized in that one of the alternatives is provided for: a) a heat exchanger, in particular, a plate-type heat exchanger is mounted in the exhaust ventilation channel and in the feeding ventilation channel (22, 23) of the ventilation unit so that the feeding air is preheated from the used air; b) the ventilation unit comprises a cooling device for cooling the feeding air, said cooling device comprises preferably at least one feeding pipe for water and at least one spraying means (26a) for producing water vapor, wherein water vapor can be preferably directed via the heat exchanger with the used air thus enabling to discharge the heat from the feeding air due to evaporation; and c) an electric heating device is arranged in the feeding ventilation channel (23) of the ventilation unit (20), said electric heating device with electrical capacity less 50 kW, in particular less 30 kW, if necessary 10-20 kW, and if necessary a controllable valve(28) is arranged so that a portion of the exhaust ventilation channel (22) together with a portion of the feeding ventilation channel (23) form another channel for the circulating air in which said heating device (27) and a fan (23a) for the feeding air are placed so that the heating device (27) can be used for heating the chamber for the process of hot drying. 7. A circulation system for working facilities, in particular, for a booth for applying coatings by spraying with a ventilation unit (20) providing feeding an air-conditioned supply air via a duct (23) of feeding ventilation into the inner chamber (1a) and discharge of air from the inner chamber (1a) via exhaust ventilation channel (22) as the used air and via the channel (21) for the circulating air and said circulating air is reintroduced into the inner chamber (1a), wherein in at least one horizontal chamber delimiting region at least two distributed areas (21b, 23b, 21b', 23b') communicated with ducts (21, 23) of the ventilation unit (20) and provided with closable openings(18a) into the inner chamber, the openings open into uniformly distributed areas of the chamber, wherein each area (21b, 23b, 21b', 23b') of the chamber is provided with communication openings (18), thus any area of the chamber can be communicated with any area (21b, 23b, 21b', 23b') to make it possible directed air currents between the ventilation unit (20) and the required area of the chamber, characterized in that the sensing device for delimiting working zone and associated with it a control device of closable openings (18) to close that area of the chamber which is an actual working zone automatically enable to communicate with the desired areas (21b, 23b, 21b', 23b'), and other areas of the chamber with other areas (21b, 23b, 21b', 23b'). 8. The circulation system as claimed in claim 7, characterized in that at least one of the alternatives is provided for: a) filters (19) are arranged between the communication openings (18) and the inner chamber (1a); b) the communication openings (18) of different areas are separated from each other by partitions (24); c) two separate areas of ducts are made in the ceiling zone and on the injecting side communicated with the feeding ventilation duct or with duct for the circulating air; d) two separate areas are made in the floor zone and on the suction side communicated with the exhaust ventilation duct and with the duct for the circulating air; e) two separate areas (21b', 23b') of ducts are made in the ceiling and on the suction side communicated with the exhaust ventilation duct and with the duct for the circulating air; f) two separate areas (21b 23b)are made in the floor zone and on the injection side communicated with the feeding ventilation duct or with the duct for the circulating air (21, 23). 9. The circulation system as claimed in claim 7 or 8, characterized in that in the area of horizontal delimiting region is provided with at least one communication duct (15) communicated with the duct of the ventilation unit (20) having at least one communication duct (15a) into the inner chamber (1a), said communication opening can move along the surface limiting the area, and preferably in the same area, limiting the surface area, a second communication duct is provided separated from the first communic