摘要:
The present invention relates to the compressors technological field used preferentially in cooling systems. Problem to be solved: Difficulty in detecting improper opening of the high pressure suction valve in multiple suction reciprocating compressor and, in more severe cases, interrupts operation of low pressure line(s). Problem resolution: Implementation of method which monitors at least one variable proportional to electrical engine torque, and based on detection of at least on positive peak of said variable proportional to torque of said electrical engine, identify and/or detects—in real time—improper opening of the valve.
摘要:
A method of and an apparatus for starting a piston type compressor (C) driven by a permanent magnet synchronous motor (M) controlled by a frequency converter (FC), the method comprising at least following steps: a) indicating the position of the piston highest pressure point and aligning the rotor of the motor (M) at the optimal starting angle prior to the actual compression operation by providing a pre-pulse to rotate the rotor of the motor (M) at least one full rotation at a certain frequency (f 2 ), during rotation measuring the load torque by means of the frequency converter as well as indicating the maximum load torque point and at the end aligning the rotor of the motor (M) at the optimal starting angle of about 180° from the maximum pressure angle, and b) at the beginning of the actual compression operation setting the rotor position opposite to the maximum torque angle by feeding direct current to the stator winding and starting the motor by supplying maximum motor current to the motor to give the maximum torque and acceleration.
摘要:
Es werden ein effektives und einfach zu realisierendes Verfahren zum Starten eines Kolbenverdichters (1) sowie ein zur Durchführung des Verfahrens geeigneter Kolbenverdichter (1) angegeben. Dabei ist vorgesehen, einen Kolben (2) des Kolbenverdichters (1) in einer Rücksetzphase (15) unter Aufbringung eines Rücksetzantriebsmoments (A R ) in Richtung auf einen Kompressionspunkt (S k ) der Kolbenstellung (S) anzutreiben, wobei das Rücksetzantriebsmoment (A R ) solange aufrechterhalten wird, bis der Kolbenverdichter (1) infolge von Fluidverdrängung aus dem zwischen dem Kolben (2) und einem korrespondierenden Druckzylinder (3) gebildeten Kompressionsraum (9) durch mindestens eine Leckstelle (16) unter Überschreitung eines Beharrungspunktes (S b ,S' b ) eine Startposition (S IV ) erreicht hat. In einer nachfolgenden Beschleunigungsphase (16) wird der Kolben dann aus der Startposition (S IV ) mit einem Startantriebsmoment (A S ) in einer Betriebsdrehrichtung (B) beschleunigt.
摘要:
A combined two-function air compressor and jet washer device, comprising an electric motor (1) the shaft of which is provided with means for its selective connection to the air compression unit and to the jet washer pump, the electric motor being of the type having two directions of rotation, the means for selectively connecting the shaft (4, 5) to the air compression unit (10) and to the jet washer pump (6) being two free wheels (41 and 51) mounted such that they have opposite dragging directions.
摘要:
Elektronische Steuerungseinrichtung (13) für einen Kältemittelkompressor, welcher zumindest umfasst - eine Antriebseinheit (18), - einen mit der Antriebseinheit (18) in Wirkverbindung stehenden Kompressionsmechanismus (5), mit zumindest einem sich in einem Zylinder eines Zylinderblocks (8) zwischen einem unteren und einem oberen Totpunkt hin und her bewegenden, über eine Kurbelwelle (6) angetriebenen Kolben (9), wobei die elektronische Steuerungseinrichtung (13), dazu eingerichtet ist, - die Drehgeschwindigkeit (ω) der Antriebseinheit (18) zu erfassen und zu steuern und/oder regeln, - die Kolbenposition zumindest annähernd zu erfassen wobei die elektronische Steuerungseinrichtung (13) dazu eingerichtet ist, den Kompressionsmechanismus (5) über die Antriebseinheit (18) derart anzutreiben, dass, für die Dauer eines mehr als eine Kurbelwellenumdrehung aufweisenden Regelungszeitabschnittes (Δt), bei mehreren Kurbelwellenumdrehungen, vorzugsweise bei jeder Kurbelwellenumdrehung des Regelungszeitabschnittes (Δt) zumindest ein Antriebswinkelabschnitt (ΔΦ) und zumindest ein Laufwinkelabschnitt (Φτ) vorgesehen ist und wobei der Kompressionsmechanismus während des mindestens einen Antriebswinkelabschnittes (ΔΦ) einem positiven Betriebsdrehmoment (Bm) und während des zumindest einen Laufwinkelabschnitt (Δτ) einem gegenüber dem positiven Betriebsdrehmoment (Bm) verringerten positiven Betriebsdrehmoment (Bmv) oder keinem positiven Betriebsdrehmoment (Bm) ausgesetzt ist.
摘要:
There is provided an electric compressor that can protect a component to be protected from heat damage according to a capability of the component. The electric compressor 10 includes a compression mechanism 11, an electric motor 12 that drives the compression mechanism 11, and a control portion 13 that controls to drive the electric motor 12, incorporated into a single casing, and further includes a temperature detector 14 that detects a temperature of one or more components that constitute one or both of the control portion 13 and the electric motor 12, and a current detector 15 that detects a current flowing through the component. When the temperature detected by the temperature detector 14 is a temperature Td, the current detected by the current detector 15 when the temperature detector 14 detects the temperature Td is a current Id, and a current corresponding to the temperature Td at a temperature characteristic relating to the current specific to the component is a current Ia(Td), the control portion 13 stops driving the electric motor 12 on the basis of a result of comparison between Ia(Td) and Id.
摘要:
A gear unit comprises shafts (101,102) for connecting to an external mechanical system, at least one gear stage (103) between the shafts, a lubrication pump (104) for circulating lubricating oil through the at least one gear stage and bearings of the gear unit, a temperature sensor (105) for measuring temperature of the lubricating oil and supplying a temperature signal, an electrical motor (107) for driving the lubrication pump, and an electrical device (108) for controlling the electrical motor so that torque directed to the lubrication pump is below a torque limit. The torque limit is determined dynamically on the basis of the measured temperature of the lubricating oil.
摘要:
[Summary] [Purpose] To provide a variable displacement compressor driving torque calculation device easily adaptable to vehicle designs, and thus, highly versatile, and an automotive air-conditioning system equipped with this device. [Solution] The driving torque calculation device comprises a radiator-inlet refrigerant pressure sensor (46) for detecting pressure of the refrigerant at an inlet of a radiator (24), a radiator-outlet refrigerant pressure sensor (48) for detecting pressure of the refrigerant at an outlet of the radiator (24), a rotational speed detection means for detecting rotational speed of the variable displacement compressor (100), a suction pressure detection means for detecting suction pressure with which the variable displacement compressor (100) sucks the refrigerant, and a calculation means for calculating driving torque on the variable displacement compressor (100) on the basis of the pressures of the refrigerant at the inlet and the outlet of the radiator (24), the rotational speed of the variable displacement compressor (100) and the suction pressure.
摘要:
Systems and methods for operating a stepper motor of a pump at a desired low velocity include memory for storing information corresponding to an intake velocity profile. The intake velocity profile represents an optimized acceleration curve for operating the stepper motor over a range of motor velocities during an intake cycle. A processor of a system controller dynamically accesses the memory during the intake cycle to acquire the information representing the intake velocity profile and issues a series of pulses to the stepper motor based on this information. In response to the pulses, the stepper motor accelerates in accordance with the optimized acceleration curve represented by the intake velocity profile. The optimized acceleration curve is based on the available torque of the stepper motor across a range of motor velocities and enables the motor to operate with greater torque utilization and less margin than traditional linear acceleration profiles.