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Methods and apparatus for unloading a screw compressor

A technology of screw compressors and vacuum devices, applied in pump devices, components of pumping devices for elastic fluids, rotary piston machines, etc., can solve problems such as driving inefficiency and loss

Inactive Publication Date: 2005-08-17
SANDVIK INTELLECTUAL PROPERTY AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However this drive is quite inefficient (maximum 80%), so any energy savings achieved during periods of low compressed air consumption will be lost during periods of high compressed air consumption

Method used

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  • Methods and apparatus for unloading a screw compressor
  • Methods and apparatus for unloading a screw compressor
  • Methods and apparatus for unloading a screw compressor

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Embodiment Construction

[0022] FIG. 1 depicts a conventional air compressor system in which air is compressed by a screw compressor 10 and the compressed air is directed through a main air discharge passage 14 having a discharge outlet 14a connected to the inlet of an air reservoir 12 . The air reservoir 12 stores compressed air and contains lubricating oil supplied to the main screw compressor 10 through the conduit 11 to lubricate, seal and cool the main screw compressor. The lubricating oil is injected into the main screw compressor due to the pressure differential between the air reservoir and the main screw compressor. Alternatively use a pump (not shown) for injecting lubricating oil into the main screw compressor. A valve 13 is provided for closing off the conduit 11 when the motor 18 and main screw compressor 10 have stopped.

[0023] As shown in Figure 2, the main screw compressor 10 preferably utilizes a pair of intermeshing screws 16a, 16b. The screw is driven by a motor 18 through a sui...

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PUM

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Abstract

A screw compressor connected to a motor and driven by the motor even during periods of low compressed air consumption. During this time, the screw compressor is at least partially unloaded, making it easier and less expensive to drive the compressor. Unloading is performed by removing air from the compressor. Preferably, unloading is performed by connecting the air inlet of the small-capacity vacuum device and the air outlet of the screw compressor. The suction force from the vacuum device is transferred to the air outlet of the screw compressor to suck the air out of the screw compressor to reduce the engine horsepower required to rotate the screw compressor. Vacuum devices are also used to increase air volume and / or air pressure. The system can be used on drill floors where holes are drilled into the ground. The screw compressor is unloaded during starting of the motor by temporarily driving the vacuum device with pressurized fluid from a pre-pressurized hydraulic accumulator.

Description

technical field [0001] The present invention relates to air compression systems, in particular systems using screw compressors driven by motors, such as diesel engines or electric motors, which also drive other equipment and which are driven continuously even during periods of low compressed air consumption Such equipment and screw compressors. Background technique [0002] A motor-driven screw compressor provides a source of compressed air that performs many useful functions. Due to their durability, compactness and reliability, screw compressor systems have gained acceptance and long-term development. Designed for long-term (typically over 100,000 hours) continuous operation, they offer up to 98% non-stop availability. Their low maintenance costs combined with their high energy efficiency minimize operating costs. The smooth-running action of the rotor allows the screw compressor to handle refractory gases, pollutants or liquid waste without vibration. [0003] A drill...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04C18/16F04B23/08F04B23/12F04C28/06
CPCF04C28/06F04C18/16F04B23/12F04B23/08
Inventor 亚尔莫·莱佩宁
Owner SANDVIK INTELLECTUAL PROPERTY AB
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