The air compressor includes: a housing assembly, wherein the housing assembly has a first installation cavity, a second installation cavity and a rotation-shaft cooperating cavity, and the first installation cavity has a gas inlet and a gas outlet; a rotor shaft, wherein the rotor shaft is rotatably fitted inside the rotation-shaft cooperating cavity, and extends into the first installation cavity and the second installation cavity; a pressure wheel, wherein the pressure wheel is nested to the rotor shaft and is located inside the first installation cavity, and the housing assembly is provided with a controlling flow channel for communicating the gas-intake side and the wheel-back side of the pressure wheel; and a driving assembly, wherein the driving assembly is nested to the rotor shaft and is located inside the second installation cavity.

The fuel cell control system includes: a reactor; an air compressor, wherein the air compressor has a compressing cavity, the compressing cavity has a gas inlet and a gas outlet, a rotatable pressure wheel is disposed inside the compressing cavity, and the gas outlet is in communication with the reactor; a control flow channel, wherein a first end of the control flow channel is in communication with the gas-intake side of the pressure wheel, a second end of the control flow channel is in communication with the wheel-back side of the pressure wheel, and the control flow channel is provided with a return valve for regulating the flow rate of the control flow channel; and a central control unit, wherein the central control unit is communicatively connected to the return valve to control the opening degree of the return valve.

The present disclosure relates to a bearing supporting assembly and a machining method thereof, and a centrifugal compressor. The bearing supporting assembly includes: bearing supports, provided with through holes for mounting radial bearings; and a fixing plate, detachably mounted at one end of each of the bearing supports along an axial direction, sides, away from the bearing supports, of the fixing plates being configured to mount first thrust bearings.

Disclosed is an air compressing apparatus with a bearing wear-causing thrust reducing/compensating unit, and more specifically, to an air compressing apparatus with a bearing wear-causing thrust reducing/compensating unit that reduces or compensates thrust generated due to high-speed rotation of an air-compression impeller formed in the air compressing apparatus, thereby maximizing a service life and durability of the air compressing apparatus.

A compressor is provided. The compressor according to the present disclosure includes: one or more impellers suctioning and compressing refrigerant; a motor rotating the impeller; a rotation shaft to which the impeller and the motor are connected; a gap sensor measuring a displacement change of the rotation shaft as a frequency change; a temperature compensation sensor determining a frequency compensation value according to a temperature change around the gap sensor; and a control unit calculating a displacement amount of the rotation shaft by reflecting the frequency compensation value provided by the temperature compensation sensor and the frequency change measured by the gap sensor.

A gyroscopic air handler provides a new powerful compact and efficient means to create airflow. At the core of the invention is a hubless magnetic chamber that rotates under its own power when acted upon by a composite electromagnetic duct. Composite field coils constructed from copper wire sheathed in a flexible iron sleeve are integrated into layers of Kevlar cloth and laid up with adhesive to create the desired shape as well as maintain the proper number of coils and spacing. Thrust bearings locate the hubless magnetic chamber within the duct. The invention can be retrofitted into the place of existing air handlers or purpose engineered for new applications. Gyroscopic inertia created by the magnetic chamber helps to dampen vibration as well as reduce the effects of unstable air conditions that can affect efficiency.

The invention relates to a rotor (4) for an air supply unit (1) of a fuel cell unit, which rotor is to be rotatably mounted in a housing (5) of the air supply unit (1) by means of foil-air bearings (15, 16). According to the invention, at least portions of the rotor (4) are formed of a carbon graphite material or of a synthetic-resin-bonded carbon fiber material or coated therewith. The invention also relates to an air supply unit (1) having a rotor (4) of this type.

A compressor system includes a compressor housing and a driveshaft rotatably supported within the compressor housing. The compressor system further includes an impeller that imparts kinetic energy to incoming refrigerant gas upon rotation of the driveshaft, a thrust disk coupled to the driveshaft, and a bearing assembly mounted to the compressor housing. The impeller includes an impeller bore having an inner surface, and the thrust disk includes an outer disk and a hub. The bearing assembly rotatably supports the outer disk of the thrust disk. The hub is disposed within the impeller bore, and includes a hub outer surface in contact with the inner surface of the impeller bore. A first contact force between the hub outer surface and the inner surface of the impeller bore increases with increased rotational speed of the driveshaft.

A thrust gas bearing includes a collar portion fixed to a shaft portion, a first base part facing one axial end surface of the collar portion, a first gas film forming part formed between the collar portion and first base part, a second base part facing an other axial end surface of the collar portion, a second gas film forming part formed between the collar portion and second base part, and a cooling flow path to carry a fluid flow. The cooling flow path includes a first flow path formed on one axial end side of the first base part and extending from an axial center toward an outer periphery, and a second flow path formed on an other axial end side of the second base part and extending from an outer periphery toward an axial center. The second to flow path is located downstream of the first flow path.

A heating, ventilation, air conditioning, and refrigeration (HVACR) system includes a compressor with a gas bearing supplied with compressed gas and a controller. The controller is configured to determine an inlet pressure and outlet pressure of the gas bearing, determine a maximum speed limit based on the inlet pressure and the outlet pressure, and prevent the compressor from operating at a speed that is greater than the maximum speed limit. A method of controlling a compressor includes calculating a maximum speed limit based on an inlet pressure and an outlet pressure of the gas bearing. The method also includes in response to determining that a speed setting is greater than the maximum speed limit, adjusting operation of the compressor such that a speed of the compressor is at or below the maximum speed limit.