How does a water curtain sprayer work?

The task of any paint booth is to ensure that the air in the spray zone is cleared of paint mist and solvent vapors.

Water spray booths have several levels of air purification from paint.

Level 1- frontal water curtain - this is the visible part of the spray booth with a water curtain. A stream of water flows down it in a continuous and continuous stream. It must be uniform and completely cover the entire front area (surface) of the curtain.

Level 2 -internal air purification - perhaps the main filtration and purification of air from paint waste is carried out here. Depending on the design of the spray booth and the manufacturer, there are various systems internal air purification.

Level 3 - dry filtration - carries out final cleaning of the air from remaining paint particles and protects the fan blades from paint sticking. Depending on the manufacturer, dry filtration is carried out in Italian painting booths with a water curtain, in Russian painting booths - in others, such as China, there is no filtration at all.

Below are diagrams of the structure of Italian and Russian paint booths:

1) Scheme of a water spray booth ZINCOVELO ZA Italy
2) Video of the painting booth in Italy

3) Scheme of a water spray booth made in Russia

4) Video of the Russia paint booth in operation (built into a clean room, overpressure chamber)

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The operating principle of a spray booth with a water curtain is as follows.

When spraying the material, a paint mist is formed. The fan, which is installed on the roof of the spray booth, creates a vacuum and draws contaminated air through the opening in the paint booth at the bottom of the front curtain.

Also, particles of paint and dust are deposited on the front front surface, which are captured and carried away in a continuous stream into the bathtub of the paint booth and settle in the water.

Contaminated air, which entered the internal cavity of the painting water chamber with the air flow, is subject to additional cleaning. In Italian painting booths there are several water cascades, in Russian painting booths there is filtration by an irrigation system. The air is purified from spray waste.

Final cleaning - dry filtration installed in front of the fans (or)

Water spray booths can be of various modifications: with a floor, with side walls, without a floor and without walls. The choice of model depends on the painting technology and the product, as well as the requirements for the quality of the coating.

Painting booths perform the function of air extraction and purification.

When creating a painting area, it is very important to ensure the correct microclimate in the spray area (the required temperature regime), as well as the incoming air must be cleaned of dust and dirt, this allows us to achieve excellent conditions for obtaining High Quality coverings.

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Paint booths with water curtain and dry filtration

Paint waste collections

Spray booths with water curtain

Design spray booths with water curtain Made from high quality galvanized sheets, bent under pressure. The chamber is equipped with a folding curtain, which facilitates its maintenance, and cassettes with filters "Paint-Stop" type, immersed in water circulation pump stainless steel, intrinsically safe fan And explosion-proof lamps IP 66 . The speed of air movement in the painting area is 0.4–0.5 m/sec.

Equipment: CVA - with a short wheelbase and CVA/G - with an extended base, water floor and grille.

At your request, our specialists will prepare a project overpressure chambers (“clean” room) based on those offered, and will also prepare you an offer for the supply painting complexes based on low pressure systemsHVLP applying paintwork ( compressors , paint sprayers , incl. HVLP , distillers and etc.).

We recommend that you familiarize yourself with some theses on organizing the work of paint shops at the base spray booths with water curtain in winter and autumn-spring periods.

We also offer to your attention device for purifying water from paint waste V spray booths with water curtain(Collection of waste paints and varnishes).

In addition to supplying Italian spray booths, we also produce our own, domestically produced. The main advantages are low price and fast turnaround time (only 15 days)! Attention! New! Restored to new condition paint lines used from Veneta Revisioni (Italy)!

Paint booths with dry filtration

The structure is made from sandwich panels . The walls of sandwich panels are made of powder-painted galvanized sheets 30 mm thick, the space between which is filled with foam polyurethane foam.

Filtration polluted air is carried out using a set of fiberglass (floor) and labyrinth (in chambers without carbon elements) filters "Paint-Stop" type, 50 mm thick, installed frontally. In order to reduce dust concentrations in painting area And storage and drying areas we recommend using

Spray booth with water curtain mod. W3000 is designed for:

• significant improvement in the quality of paint and varnish coatings;
• significant reduction in maintenance time for painting areas;
• increasing the productivity of painting areas;
• ensuring acceptable sanitary and hygienic working conditions for painters and support staff;
• immediate removal of solvent vapors from the work area in order to prevent the formation of explosive concentrations;
• significantly reducing emissions of paint and varnish sludge into the environment;
• reducing the fire hazard of the paint job.

Areas of use

The W3000 water curtain spray booth is successfully used for painting metal, glass, wood, plastic and products made from them.

The range of painted products is very wide:

• painting wheel rims
• painting of large metal structures
• painting of garden and agricultural equipment
• painting drills
• painting pipes and poles
• painting piles
• painting welded air ducts
• painting formwork
• painting elements of building structures
• painting cement-fiber boards and other building and finishing materials
• painting (varnishing) of electronic boards and components
• painting aircraft parts
• painting elements of boats and boats
• car bumper painting
• restoration of furniture and antiques
• furniture painting
• painting MDF facades
• painting tables
• painting chairs
• window painting
• painting doors
• painting molded products (door moldings, skirting boards)
• painting parquet and floor boards
• painting of other furniture and joinery products

Principle of operation

Some of the paint and varnish material sprayed by the painter does not fall on the product. At the same time, fine dust from the quick-drying components of the varnish is formed in the air - dust, which, thanks to the painting booth, is removed from the working area by an air flow parallel to the floor.

A significant part of the varnish dust is deposited on the water curtain (up to 85%).

Additional filtration systems (optional) - a labyrinth of barrier panels that repeatedly change the direction of air flow, as well as quick-release cassettes with an inexpensive replaceable element - a fiberglass filter - allow achieving a degree of purification from solid particles of up to 99%.

A “side effect” of using water in the filtration system is the absorption of solvents when the chamber begins to operate. After the water is saturated with solvent molecules, the absorption of “odors” stops, and the illusion of their filtration disappears.

Basic equipment

Prefabricated casing and settling tank made of galvanized steel with big amount longitudinal, transverse and vertical stiffeners.

Provides durability and reduced vibration during operation.

Double cascade of water curtains.

The front curtains of both cascades (those through which water flows) have a quick-release design. Thanks to this, not only is full access to the interior of the chamber for maintenance provided, but it also makes it technically possible to narrow the gap between the lower edge of the curtain and the water in the bathtub located below. For the upper cascade, this is the bath of the lower cascade, and for the lower cascade, this is the settling bath.

This design has a number of advantages, the main ones being:

• due to the absence of long sections of free fall of water, the formation of splashes in both the upper and lower parts of the working area is eliminated;
• water rushing off the lower edge of the water curtain creates a dense flow that additionally cleans the air of suspended particles, which eliminates the need to install water sprinklers;
• the speed of air flow after entering the painting booth is reduced by 4-5 times, which allows suspensions to settle into the settling bath, increasing the degree of purification of the emitted air.

1. Attached bath to accommodate the pump>

   The location of the bath is universal (to the left or to the right of the camera). In this way, the service side can be selected during installation.

   The location of the service area outside the chamber allows for visual control of operation and avoids external contamination of the pump, which leads to its overheating and premature failure.

   Valves located outside make it easy to regulate the water flow in the water curtains, as well as to quickly drain water from the chamber using a standard pump during its scheduled maintenance.

   A stainless steel pump that pumps lumps of coating sludge with a diameter of up to 35 mm, as well as a built-in overheating protection system.

2. A system of circulation water lines, including a water circulation valve, an automatic water drain valve, all necessary hoses, passage units, flanges, clamps and other installation materials
3. Mounting kit including bolts, nuts, washers, sealant, etc. according to camera configuration
4. Packaging for transportation by road
5. Passport and instruction manual
6. CD with diagram and photo illustrations of the assembly

Additional options

Explosion-proof exhaust fan.

Explosion-proof design, with an explosion-proof motor (optional - with a general industrial motor or not explosion-proof).

1a- Fan with a wafer-type supporting body. Thanks to the installation of additional amplifiers through a rubber gasket directly on the roof of the chamber and the placement of additional amplifiers in the fan installation area, vibration resulting from clogging of the fan blades during intensive operation of the spray booth is minimized.

The fan motor together with the impeller is completely removed from the housing. To do this, you do not need to caulk the air ducts, disconnect the electric motor from the electrical network, etc. This fan design minimizes maintenance time.

1b- Fan with supporting frame. The fan can be installed in any convenient place, incl. outdoors, and is connected to the chamber by an air duct (the air duct is excluded from the supply).

The design provides the ability to remove the motor together with the impeller from the fan housing without caulking the air ducts. This ensures ease of maintenance and minimizes technological downtime of the painting chamber.

Additional air filtration devices

The combined use of devices allows achieving a degree of solid particle removal of up to 99%.

2a- A labyrinth of barrier panels that repeatedly change the direction of air flow. At the same time they serve as additional diagonal stiffeners. Recommended for installation when placing the fan on the roof of the chamber.

2b- Quick-release filter cassettes with an inexpensive replaceable element - a fiberglass filter.

Electrical control panel

3a- Shield in a plastic case with automatic switches– for placement outside the hazardous area

3b- Shield in a metal case with on/off/emergency shutdown buttons – for placement outside the hazardous area.

Explosion-proof fluorescent two-lamp lamp, 2x36W. The lamp is supplied with 2 lamps.

Increasing the depth of the working area by 500 mm

Set of two side panels and a roof panel.

Water floor

The water floor bath is integral with the settling bath of the paint booth and has a height of 300 mm from the workshop floor level. Thus, no gangways are required, making it easier for the operator to move around. The large volume of water filling the bath allows you to increase the interval for cleaning paint materials from accumulated sludge, reducing process downtime. Galvanized gratings covering the water floor can withstand a footprint load of at least 200 kg and 450 kg/m2.

1. The supply fan and set of filters for the “economy project” include:

   • Supply fan of general industrial design. To create excess pressure in the paint sprayer, the capacity of the supply fan is selected to be 10-20% greater than the exhaust fan, taking into account the fact that the resistance of both the pocket filter and the filter of the air distribution device must additionally be overcome.
   • A pocket filter in its own housing, designed for connection with the supply fan. The filter design is quick-detachable. The filter is designed for repeated use. Its regeneration is carried out manually, mechanical cleaning and purging.
   • A roll of fine filter (20x2 meters) for the buyer to independently sew an air distribution hose.

Organizing the operation of a paint booth involves installing cleaning systems, and these systems take into account the main problem - the presence of paint residues in the exhaust air. Standard filtration methods are not effective, so the exhaust air passes through a water trap or curtain before entering the duct. Water best retains both fractions of the paint material and harmful impurities.

Features of cameras with a water curtain

The quality of applying paint in a garage using a brush and professional camera The spray method is very different. High-quality coating can be achieved thanks to a unique microclimate, since the air in the working area is pre-cleaned and heated to the required temperature. Dust ingress is critical for a freshly painted surface. Strict requirements for sterility and air humidity are observed in the room, but all this would be meaningless if such cameras did not have effective ways combating paint mist - we are talking about fragments of paint that have not adhered to the surface being painted.

To create suitable working conditions, an air circulation system is organized in such chambers. At the entrance to the chamber there are filters that clean the air from large fractions, then the air is heated to a certain temperature and supplied to the work area. Once the painting process begins, some of the paint will lie on the surface and begin to set, and some will be in the air. Then everything depends on whether air will enter the filters naturally or by force.

Water, by its nature, is good at purifying the air from paint fractions, but to improve its properties, special additives are added to the water. At the same time, it must also have dry filters operating in parallel. Water takes only fractions of paint, but dry filters are no less important for the system, which purify the air before entering the exhaust fan.

Operating principle of a water curtain

A water curtain is usually understood as a hydrofilter that cleans air flows from paint and harmful impurities. Separate cascade. nozzle and nozzle-free filters. The difference lies in the method of supplying the water flow for cleaning. When using a cascade filter, the curtain is created by the shield; in nozzle filters, the curtain is created by nozzles. Vortex hydrofilters are used for active mixing of air and water.

The filters work like this:

1. The exhaust air, which already contains paint particles, vapors and other harmful impurities, is supplied to the screen. A fan can do this, or air will get there naturally.
2. The sediment is responsible for creating a continuous layer of water that is applied to the screen.
3. As soon as the air flow collides with water, large particles are separated from it and fall into a specially equipped bath.
4. Next comes the second stage of purification, in which everything that remains after the first stage is removed from the air.
5. Chaotic air flows are intercepted by a droplet eliminator.

Requirements

There is only one requirement - the system must cope with waste flows; accordingly, everything depends on the intensity with which the paint booth operates. If the load is large, then for better fog capture, you can install an active water pan, which is a bath covered with a grill. The presence of nozzle filters requires you to choose between screw or tangential nozzles:

1. The presence of screw nozzles provides a more stable and resistant water jet when colliding with air. But such systems are difficult to design.
2. It is easier to produce tangential nozzles, which have a less stable spray, but they are less likely to clog.
3. The angle of the water jet cone should be in the range from 70 to 75 degrees, and the pitch of the nozzles will be determined from the angle.

Water consumption is also regulated by the owner of the camera. It depends on how quickly the water will pass over the screen or shields, as well as on the number of curtains. In such systems, the water circulation is almost always closed, that is, the same volume of water works in the system for a certain time.

To ensure high-quality separation of paint particles from water and their subsequent removal, it is recommended to add impurities to the water. They turn the remaining paint into sludge, which settles out after a period of time. You should also add antifoaming agents, otherwise the water may start to foam.

Advantages and disadvantages

The advantages of such installations are that more effective method There is simply no purification of exhaust air from specific fractions. The process is thought out to the smallest detail, including the subsequent purification of water from sediment. Another question is that here you need to work out an effective scheme taking into account the needs of the camera. You will need to add impurities to the water itself so that the water itself does not foam, and the paint adheres better to the liquid, but does not clog into lumps. Water filters do not work separately from the main ventilation system, so you need to calculate exactly how much air should be removed from the chamber in one unit of time.

The use of cameras with a water cleaning function is justified in all situations when it comes to professional painting. Since in this case you will have to follow strict security rules environment And sanitary standards. Setting up a water curtain for a non-professional camera is problematic both because of the price and the complexity of installation and further maintenance.

An excellent business solution is to paint cars at home. But in order to be able to paint cars, there is little experience and equipment for painting, you also need to have a room in which the painting will be done Vehicle. Organizations that paint cars have long carried out painting work in a chamber with a water curtain. It is no secret that such a device can be made with your own hands, only by making some effort and spending a small amount of money to purchase some equipment. You can buy a ready-made one, but its cost will be very high, and not everyone is ready to invest a large amount. In order to make a device with a water curtain with your own hands, you will also need some knowledge.

What does the camera consist of?

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A spray booth with a water curtain is a closed room that is made of stainless steel and has supply and exhaust ventilation. This ventilation is created using electric motors. The main part of the device is a heating element, which helps heat the room to the required temperature and maintain it during painting work. The chamber also includes lighting, which must be distributed evenly over the entire area and have sufficient luminous flux. It is best to place them not only on the ceiling of the room, but also on the side walls. The device also includes equipment for painting work and other auxiliary tools.

Layout of the painting booth

Knowing what the paint booth consists of, you need to decide on the location where the arrangement will be made, and make a project according to the location of the main structural elements. An excellent location for the construction of the device can be a garage, or build a new extension, which will take more time and, accordingly, finances.

To make a device with your own hands, you will need structural elements from which it will be based, heating and ventilation systems, filtration and lighting.

Making a painting booth
Having made the layout, it is necessary to carry out all technical calculations and begin installation work. First of all, a new room is built or a frame is assembled inside the garage. General dimensions should be: length 10 meters, width 8 meters, height 3.5 meters.

1. The painting booth has a corresponding size: 4 meters wide and 6 meters long.
   It is best to use insulated gates to avoid suction and loss of warm air; the outside is lined with corrugated sheeting. At the point of contact between the gates, it is insulated with a special adhesive tape. Places with cracks must be foamed with foam.
2. Floor construction. The base of the floor is made of concrete, inside which a hole is made, and a metal pipe with a diameter of 150 mm is led out onto the street for air outflow. A metal grate is placed on the floor over the entire surface of the room to a height of 15-20 cm.
3. Walls. The walls are sheathed with corrugated sheets, and the inside is insulated; sandwich panels can be made.
4. Air exchange system. Components: two electric motors and metal pipes with diameters of 100 mm and 150 mm respectively. An electric motor with a power of 5 kW is used for supply ventilation, and at least 7 kW for exhaust ventilation.
5. Ceiling. It is made of corrugated board, with insulation. Ceiling mounted metal carcass for air flow. An electric heater that will supply warm air indoors, installed outdoors.

1. Air cleaning. It is carried out using filters and has three-level cleaning.
   • Level 1 A frontal water curtain is created, which is carried out by flowing down uniform streams of water;
   • Level 2. Cleaning the air inside the device. Promotes filtration and purification of air from paint waste;
   • Level 3. Dry filtration. Helps completely clean the air from paint particles and protects the fan from paint sticking.
2. Lighting. Mounted LED or fluorescent lamps along the ceiling and walls of the room.
   Automatic control and monitoring sensors are also installed over the system of supply and exhaust fans and filters.
   After installing everything necessary for the water chamber, painting equipment is installed.

How the work is carried out

An electric heater pumps air from the atmosphere into a confined space in a room. As the air passes through the system, it is purified by filters, each of which provides a specific purification.
The temperature in the room rises due to the work of the heating elements. The painting process begins. Down on the floor, air begins to be sucked out of the chamber using an exhaust fan. Water curtains are installed in front of the main line, which help retain paint particles. Here the air goes through all three levels of purification, if these are pre-installed. Cameras with a water curtain and factory production work on the same principle.

Positive aspects of a DIY device

1. Free system planning.
2. Big savings.
3. Possibility to save on all components.
4. Ability to use the main parts of the structure.

Disadvantages of the device

1. There may be inaccuracies in calculations or imperfections in the installation of the device.
2. It is not possible to completely automate the process, since the elements of the device consist of separate parts.
3. There are no guarantees for the performance of such a device.

Price

The cost of constructing a chamber with a water curtain with your own hands may take long time, but its cost will be about $4,000. You can buy a factory one for $20,000 or more. To start a business, the best option There is a construction with your own hands, which is much more profitable for a start-up business.