Denso Corporation

Sota Shibasaki

Hiroshi Okada

Mamoru Shimoda

Kazuhiro Ojika

A discharge pulsation reducing cooler B is provided to cover the circumferential periphery of a compressor A. The discharge pulsation reducing cooler B has a delivery passage and a jacket covering that, and cooling water is circulated through a passage formed between the delivery passage and the jacket . Delivered air flowing through the delivery passage is cooled by the cooling water. In particular, because heat exchange efficiency is promoted by turbulence caused by the pulsation in the delivery passage , the delivered air is cooled efficiently. Also, pulsation is reduced in first and second expansion chambers in the delivery passage , and pulsation noise in the delivery passage is reduced by the cooling water passage and the jacket

Gas compressor apparatus having a discharge pulsation reducing cooler

A compressor is composed of a pair of rotors engaging with each other and a driving mechanism having plural gears for driving the pair of rotors. The pair of rotors is disposed in a rotor chamber and the driving mechanism in a gear chamber, both chambers being separated by a separating wall. Fluid such as air is introduced into the rotor chamber from an inlet port and compressed therein, and the compressed air is delivered through an outlet port formed at a position close to the driving mechanism. A cooling water passage is formed at a bottom portion of the gear housing to cool lubricant encapsulated in a gear chamber. Additional cooling water passages may be made to further cool the components of the compressor.

Compressor having cooling passage integrally formed therein

Pulsation, vibration and noise of a screw compressor is caused by compressed air abruptly discharging through a discharge port in a rotor chamber during rotation of a pair of rotors. The inside opening shape of the discharge port is within two tip curved lines drawn by the pair of rotors and coincides with the two tip curved lines at least at one point when fluid starts to discharge. In one embodiment, the inside opening shape is triangular with a vertex at a point of intersection of the two tip curved lines and a base side along the discharge end face of the rotor chamber. With this, when the air compressed in the compression chamber discharges from the discharge port, the discharge opening area of the discharge port smoothly increases. This reduces the pulsation of the discharged air and thus reduces the vibration and noise of the screw compressor.

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Kariya, Japan

Sota Shibasaki