Screw compressor stations of the VVU

Screw compressor stations of the VVU series are designed to produce compressed air and supply it to pneumatic networks of industrial enterprises, drive pneumatic tools and various mechanisms.

A compressor with a moisture separator and a filter installed on the receiver is an exclusive system that functions even at a temperature of 45 °C.

The compact design of the compressor requires a minimum of work space. Removable casing doors provide easy maintenance and access to any part of the device. The soundproof steel casing is covered with a special anti-corrosion material.

The installation is a finished and ready-to-use monoblock.

The principle of operation of the VVU installation:

Atmospheric air enters the compressor through the air filter of the compressor and the throttle valve, where it is compressed. Oil is supplied to the compression cavity of the compressor to lubricate the friction pairs, seal the gaps and remove the heat released during the compression process.

Compressed air mixed with oil from the compressor enters the oil separator, where the oil is separated from the air. Then, the compressed air enters the final heat exchanger through the minimum pressure valve and then enters the pneumatic system of the consumer.

The oil separated from the compressed air from the lower part of the oil separator, as a result of the pressure difference, is fed to the temperature controller and then enters the compressor through the oil filter. When the oil temperature reaches 65-70 °С, the temperature regulator directs the oil to the oil filter through the heat exchanger.

Fine particles of oil remaining in the compressed air are separated in the fine-cleaning filter by the air-oil separator and are led to the compressor through the drain line.

In the case of a decrease in compressed air consumption, the discharge pressure increases. In case of reaching the pressure value of the upper setting value of the sensor-relay of the pressure difference, the solenoid valve Y1 ensures the removal of the control air supply from the throttle valve drive.

The throttle valve closes, thereby stopping the suction of atmospheric air into the compressor. Thus, the installation goes into idle mode. At the same time, the relief valve (built into the throttle valve) ensures a decrease in pressure in the oil separator in order to reduce power consumption. A small amount of atmospheric air is supplied to the compressor through the bypass channel in the throttle valve to maintain the pressure in the oil separator sufficient to ensure stable oil circulation.

Structure and operation of the component parts of the installation

1. Screw module

The screw module is a prefabricated structure of a screw block fixed on the oil separator. The module includes a combined air and oil cleaning unit. A throttle valve and an air filter are installed on the suction flange of the screw unit.

During compression, oil is injected into the working cavity of the compressor through a hole in the housing for lubrication, sealing of gaps and removal of heat released during compression. The oil separator is designed for oil storage and inertial cleaning of compressed air from oil and consists of: a housing, a safety valve, an oil level indicator, an oil drain plug, and a temperature sensor. The oil separator body is equipped with an oil filler neck.

Compressed air is cleaned by an air-oil separator fixed to the body of the combined unit through a transition fitting. The remaining oil particles flow down the inner surface of the separator and are returned to the compressor through a special drainage pipeline.

Clean compressed air through the minimum pressure valve built into the combined unit enters the final heat exchanger.

Compressed air is cleaned by an air-oil separator fixed to the body of the combined unit through a transition fitting. The remaining oil particles flow down the inner surface of the separator and are returned to the compressor through a special drainage pipeline.

Clean compressed air through the minimum pressure valve built into the combined unit enters the final heat exchanger.

The temperature regulator included in the combined unit is designed to maintain a stable temperature of the oil injected into the compressor. Temperature stabilization is carried out by changing the direction of oil flow depending on its temperature along a small (bypassing the oil section of the heat exchanger) or large (through the oil section of the heat exchanger) ring.

2. Cooling unit

The cooling unit consists of a heat exchanger, which consists of oil and air sections in a single unit, a fan assembly, a casing and a bracket for installing the unit on a subframe.

Oil and air-cooling sections are designed to remove excess heat released by the compressor during air compression.

The fan unit is designed to organize the flow of cooling air through the heat exchanger.

The operation of the electric motor is controlled by an automation system that supplies or removes the power supply voltage depending on the oil temperature.

3. Control cabinet

The control cabinet consists of a case, a door and a mounting panel (inside) with electrical equipment installed on it.

The controller is placed on the front of the cabinet.

Electrical equipment is placed on the wall of the cabinet: circuit breakers, magnetic starters, thermal relays, three-phase voltage control relays, intermediate relays, a measuring transducer of a temperature sensor, as well as boxes and terminal blocks for the location and installation of wires.

4. Automation and control system

Automation system from solenoid valve Y1; temperature sensor VK1; PS1, PS2 pressure relay sensors; connecting pipelines and impulse tubes.

The automation system provides:

• Supply of control air under the diaphragm of the throttle valve during the transition of the station to the idling mode;
• Unloading the internal cavities of the station to atmospheric pressure after stopping the compressor drive;
• Compressed air pressure control and control signals for transferring the station to idling mode in the event of an increase in the compressed air pressure to the upper limit and return to the injection mode in the event of a decrease in the compressed air pressure to the lower limit;
• Control of the pressure of compressed air and the supply of a control signal for an emergency stop in the event of an increase in the pressure of compressed air above the permissible limit with simultaneous light signaling.

The manufacturing plant guarantees the correct operation of the product for 12 months from the date of commissioning, but no more than 18 months from the date of shipment from the manufacturing plant. During the warranty period, the product must be operated for no more than 2000 hours using the spare parts supplied with the product. The shelf life of the product without re-conservation is 18 months.

Compressor units of the VVU series are finished and ready-to-use units. To order this installation, contact our professional managers.

Concern “Nicmas” has finished products in stock for your convenience.