Unbalance detection device, and unbalance detection method

An unbalance detection device for detecting unbalance of a rotor of a turbo-cartridge which includes the rotor including a turbine wheel and a compressor wheel coupled via a rotational shaft and a bearing housing accommodating a bearing which supports the rotor rotatably, the unbalance detection device comprising:

• a turbine-side housing accommodating the turbine wheel;
• a compressor-side housing accommodating the compressor wheel;
• a support mechanism configured to nip and support the turbo-cartridge from both sides by pressing at least one of the turbine-side housing or the compressor-side housing toward the turbo-cartridge, the support mechanism including a pressing rod and a piston device configured to push the pressing rod;
• a vibration insulator interposed in each of a gap between the turbine-side housing and the turbo-cartridge and a gap between the compressor-side housing and the turbo-cartridge;
• a vibration sensor installed so as to be contactable with the bearing housing, the vibration sensor detecting vibration upon rotation of the rotor;
• and
• a biasing member configured to bias the vibration sensor toward the bearing housing, the biasing member being an elastic member,
• wherein the unbalance detection device further comprises an oil supply pipe for supplying lubricant oil into the bearing housing, the oil supply pipe being selectively connected to and separated from an oil supply port formed on the bearing housing,
• wherein the biasing member is installed on the oil supply pipe so that the vibration sensor is biased toward the bearing housing in a state where the oil supply pipe is connected to the oil supply port formed on the bearing housing,
• wherein the unbalance detection device further comprises a sensor installation device for installing the vibration sensor to the oil supply pipe,
• wherein the sensor installation device includes:
• a support base supporting the vibration sensor on a first surface of the support base;
• and
• a guide member fixed to the oil supply pipe and configured to guide the support base in a direction along a normal direction of an opening plane of the oil supply port, the guide member having a guiding portion extending in the direction along the normal direction,
• wherein the biasing member is configured to bias the vibration sensor toward the bearing housing by being in contact with a second surface of the support base,
• wherein the guide member includes a body portion having a tubular shape and a bottom portion formed on a first end side of the body portion,
• wherein the support base is accommodated in the body portion so as to be slidable,
• wherein the biasing member is accommodated between the bottom portion and the second surface of the support base, in the body portion, and
• wherein, on a second end side of the body portion, a lock being configured to prevent the support base from falling out from the body portion is disposed.

An unbalance detection method for detecting unbalance of a rotor of a turbo-cartridge which includes the rotor including a turbine wheel and a compressor wheel coupled via a rotational shaft and a bearing housing accommodating a bearing which supports the rotor rotatably, the unbalance detection method comprising:

• a vibration insulator installation step of interposing a vibration insulator in each of a gap between a turbine-side housing which accommodates the turbine wheel of the rotor and the turbo-cartridge and a gap between a compressor-side housing which accommodates the compressor wheel of the rotor and the turbo-cartridge;
• and
• a support step of nipping and supporting the turbo-cartridge from both sides by pressing at least one of the turbine-side housing or the compressor-side housing toward the turbo-cartridge via the vibration insulator;
• and
• a sensor installation step of installing a vibration sensor detecting vibration upon rotation of the rotor so that the vibration sensor is in contact with the bearing housing,
• wherein the sensor installation step includes biasing the vibration sensor toward the bearing housing,
• wherein the unbalance detection method further comprises a biasing member installation step of installing a biasing member to an oil supply pipe for supplying lubricant oil into the bearing housing to bias the vibration sensor toward the bearing housing by connecting the oil supply pipe to an oil supply port formed on the bearing housing, the biasing member being an elastic member,
• wherein the bearing housing includes a sensor contact mount having a flat surface shape for being in contact with the vibration sensor, and
• wherein the oil supply pipe includes an oil-supply-pipe vibration insulator disposed on a portion of the oil supply pipe connecting to the oil supply port, the oil-supply-pipe vibration insulator being configured to reduce vibration transmitted between the oil supply pipe and the turbo-cartridge.