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Compressor

Compressor description/claims

1. Field of the Invention

The present invention relates to a compressor which boosts preliminary compressed fluid such as air so as to be stored as high compressed fluid in a tank.

2. Description of the Related Art

In a recent plant, a piping for supplying compressed air into a plant has been installed such that various pneumatic devices connected to the respective outlet joints of the piping may be operated. If the compressed air at the pressure higher than the one supplied from the piping in the plant is required, the compressor is connected to the outlet joint of the piping for further boosting the preliminarily compressed air supplied from the piping.

Japanese Unexamined Patent Application Publication No. 2007-51614 discloses a booster type compressor formed of a main body driven by an electric motor to suck air for recompression so as to discharge the resultant high compressed air, and a tank which stores the high compressed air discharged from the main body of the compressor.

The employed booster type compressor in general has the main body directly connected to the piping in the plant. As the other plural pneumatic devices are connected to the piping in the plant, the compressed air may cause pulsation depending on the state in the usage. The compressed air inside the piping of the plant may form drain owing to the change in the pressure or the temperature.

When the booster type compressor is installed in the piping of the plant, an inlet tank is required to be provided between the piping in the plant and the main body of the compressor so as to prevent pulsation in the compressed air supplied and to discharge the drain.

In the aforementioned case, the space for setting the additional inlet tank separately from the compressor is required, thus increasing as the cost for setting the tank and the piping. When the booster type compressor is used in the other place, both the compressor and the inlet tank have to be moved, resulting in large labor and considerable time required for laying out those devices.

Accordingly, it is an object of the present invention to provide a compressor which may be easily installed in a small space without preparing an additional inlet tank.

The present invention provides a compressor which includes a first tank connected to an external compressed fluid source for accommodating an inflow of a low compressed fluid from the external compressed fluid source, a main body of the compressor for sucking the low compressed fluid from the first tank so as to be compressed, and a second tank for storing a high compressed fluid compressed by the main body of the compressor, and for discharging the stored high compressed fluid to outside with a high-pressure outlet joint. The first tank, the main body of the compressor, and the second tank are combined to form a single assembly.

The first tank may be provided with a low-pressure outlet joint for discharging the low compressed fluid contained in the first tank.

The first inflow pressure control valve may be provided between the compressed fluid source and the first tank for regulating the inflow of the compressed fluid at a pressure in excess of a specified pressure into the first tank.

A second inflow pressure control valve may be provided between the first tank and the main body of the compressor for regulating the inflow of the compressed fluid at a pressure in excess of a specified pressure from the first tank to the main body.

The first tank may be provided with a relief valve which releases the compressed fluid to outside when a pressure within the first tank exceeds a set pressure.

A path extending from the external compressed fluid source to the main body of the compressor is provided with a filter for eliminating dust contained in the compressed fluid.

The first tank and the second tank have cylindrical bodies in parallel with each other in a longitudinal direction, and are horizontally installed with respect to a mount surface.

The first tank and the second tank may have cylindrical bodies in parallel with each other in a longitudinal direction, and vertically installed on a mount surface.

The first tank and the second tank may be provided with a gap therebetween. The main body of the compressor may be interposed between the first tank and the second tank so as to be partially fit in the gap.

Each of the first tank and the second tank may be provided with a drain valve for discharging a drain.

The structure may be provided with a communication pipe for allowing the first tank and the second tank to communicate with each other, wherein the communication pipe is provided with a check valve which allows the compressed fluid to flow from the first tank to the second tank but blocks an inverse flow.

The structure may be provided with an intake switching valve provided between the first tank and the main body, wherein the intake switching valve allows the main body to suck an external air upon its start-up and switches to a state where the main body sucks the compressed fluid from the first tank when a pressure within the second tank reaches a set pressure.

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• Utility Patent

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