Screw compressor

1. A screw compressor comprising:

a screw compressor main body;

a motor for driving the screw compressor main body;

a gearbox having opposite side surfaces and a bottom, the gearbox being interposed between the screw compressor main body and the motor to transmit a driving force of the motor to the screw compressor main body; and

a gas cooler having a cooler casing having a top and a side surface, the cooler casing being positioned below either the screw compressor main body or the motor and the cooler casing side surface being detachably attached to a one side surface of the opposite side surfaces of the gearbox,

wherein the cooler casing top is connected to the screw compressor main body via piping so that the gas cooler cools compressed gas discharged from the screw compressor main body; and

the cooler casing is spaced apart from the screw compressor main body, and a heat exchange portion of the gas cooler is provided in the cooler casing.

2. The screw compressor according to claim 1 , wherein each of the gearbox and the gas cooler has a support end portion, and a vibration isolator is disposed between a base plate on which the gearbox and the gas cooler are placed and each of the support end portions of the gearbox and the gas cooler.

3. The screw compressor according to claim 1 , wherein the gearbox has two support end portions and the gas cooler has a single support end portion, and a vibration isolator is disposed between a base plate on which the gearbox and the gas cooler are placed and each of the support end portions of the gearbox and the gas cooler.

4. The screw compressor according to claim 3 , wherein the motor has a motor shaft extending in a direction, only one vibration isolator disposed between the base plate and the single support end portion of the gas cooler is arranged substantially at a center of the gas cooler in a direction orthogonal to the extending direction of the motor shaft.

5. The screw compressor according to claim 2 , wherein the motor has a motor shaft extending in a direction, each of the vibration isolators disposed between the base plate and the support end portions of the gearbox is arranged in a vicinity of opposite ends of the gearbox in a direction orthogonal to the extending direction of the motor shaft.

6. The screw compressor according to claim 4 , wherein each of the vibration isolators disposed between the base plate and the support end portions of the gearbox is arranged in a vicinity of opposite ends of the gearbox in a direction orthogonal to the extending direction of the motor shaft.

7. The screw compressor according to claim 3 , wherein the motor has a motor shaft extending in a direction, only one vibration isolator disposed between the base plate and the single support end portion of the gas cooler is arranged substantially at a center of the gas cooler in a direction orthogonal to the extending direction of the motor shaft.

8. The screw compressor according to claim 3 , wherein the motor has a motor shaft extending in a direction, each of the vibration isolators disposed between the base plate and the support end portions of the gearbox is arranged in a vicinity of opposite ends of the gearbox in a direction orthogonal to the extending direction of the motor shaft.

9. The screw compressor according to claim 7 , wherein the motor has a motor shaft extending in a direction, each of the vibration isolators disposed between the base plate and the support end portions of the gearbox is arranged in a vicinity of opposite ends of the gearbox in a direction orthogonal to the extending direction of the motor shaft.

10. The screw compressor according to claim 1 , wherein the gas cooler includes a first gas cooler and a second gas cooler wherein the cooler casing is formed in a substantially rectangular parallelepiped shape and the heat exchange portion includes a first heat exchanger in the first gas cooler and a second heat exchanger in the second gas cooler.

11. The screw compressor according to claim 1 , wherein the gas cooler has a substantially rectangular parallelepiped shape having a long axis, a short axis, and a height wherein the gas cooler is mounted on a base plate in such an orientation that has the long axis orthogonal to an extending direction of a motor shaft of the motor, the short side axis extending along the extending direction of the motor shaft, and the height orthogonal to the extending direction of the motor shaft.

12. The screw compressor according to claim 1 , wherein the side surface of the gas cooler is provided with a first attachment portion and the one side surface of the gearbox is provided with a second attachment portion, and the gas cooler is attached to the gearbox via connection between the first attachment portion and the second attachment portion.