摘要:
A system includes a first pump (102) connected to an inlet line (104) and connected to a first outlet line (106) for supplying a first sub-system (112) over a first pressure schedule. A second pump (108) is connected to the inlet line and connected to a second outlet line (110) for supplying a second subsystem (114) over a second pressure schedule. A backup selector (116) is in fluid communication with the first and second outlet lines. The backup selector is configured to switch to a first backup mode to supply the first sub-system from the second pump upon failure of the first pump. The backup selector is configured to switch to a second backup mode to supply the second sup-system from the first pump upon failure of the second pump.
摘要:
A swash plate type piston pump includes a plurality of pistons, a cylinder block including a plurality of cylinders for housing the pistons, a swash plate for reciprocating the pistons to expand and contract volume chambers of the cylinders with the rotation of the cylinder block, a biasing mechanism for biasing the swash plate in a direction to increase a tilting angle, a first control pin for driving the swash plate in a direction to reduce the tilting angle according to a first load pressure, and a second control pin for driving the swash plate in a direction to reduce the tilting angle according to a second load pressure. The first and second control pins are connected in series.
摘要:
The present invention relates to a water supply apparatus that pressurizes water from a water main pipe to supply the water to a building, such as an apartment building, a commercial building, or the like. The water supply apparatus includes a controller (10) storing a first lower limit value L1 higher than a shutoff rotational speed N0 and a second lower limit value L2 lower than the shutoff rotational speed, which is a rotational speed required for achieving a target pressure PA in a shutoff state. The controller (10) is configured to switch a lower limit of the rotational speed of the pump (1) from the first lower limit value L1 to the second lower limit value L2, and determine that the pump (1) is in a low-flow-rate state if the rotational speed of the pump (1) becomes equal to or lower than the shutoff rotational speed N0 within a predetermined detection time.
摘要:
A method of operating a hydraulic apparatus comprising a hydraulic circuit region and hydraulic machine which is controlled to displace pulses of fluid of known volume into or out of the hydraulic circuit region, generating pulses of pressure in the hydraulic circuit region and torque in the hydraulic machine shaft. The response of parts of the hydraulic apparatus to these pulses is measured and used to determine properties of the hydraulic apparatus. The response of the pressure in the hydraulic circuit region to pulses at different pressures can be used to measure the hydraulic stiffness of parts of the hydraulic circuit region. It is possible to detect faults and to make measurements useful in subsequent operation of the hydraulic apparatus.
摘要:
An air compressor comprises: a housing (60), a motor (691) coupled onto the housing (60), a transmission mechanism (69), a cylinder (61) extending from the housing (60) and having an air reservoir (63), a plurality of ducts (64,65) installed at the air reservoir (63), and a piston (62) installed in the cylinder (61) and driven by the transmission mechanism (69) and the motor (691) to input compressed air into the air reservoir (63) and output the compressed air from the ducts (64,65) of the air reservoir (63). The air compressor further comprises a pressure gauge (M) having an over-pressure protection unit which is directly coupled to one of the ducts (64,65). The pressure gauge (M) measures and indicates a change of the pressure value and, if the pressure value reaches a predetermined maximum safety pressure value, discharges air through an over-pressure protection unit.
摘要:
A system includes a sorting chamber and a fluid channel in fluid communication with the sorting chamber. A peristaltic pump is in fluid communication with the fluid channel to pump fluid through the fluid channel to the sorting chamber at a fluid flow rate. A fluid damper is in fluid communication with the sample fluid channel. The fluid damper includes a gas and reduces variations in the fluid flow rate by compression and expansion of the gas in response to fluid flow in the fluid channel.