Method for operating a linear motor compressor, and linear motor compressor
AssigneeBurckhardt Compression AG
InventorAdrian Luzi VALÄR
Life of this patent
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Abstract
A method for operating a linear motor compressor an electric linear motor, a cylinder, and a linearly movable free piston assembly having a piston. The cylinder and the piston form a compression chamber, and a free piston assembly is directly driven by the linear motor and is moved back and forth between an upper dead center and a lower dead center along a stroke path. The compression chamber is supplied with a fluid from the outside, and the supplied fluid is compressed or expanded in the compression chamber and subsequently dispensed back outside. At least one state variable is specified for the linear motor compressor, and the linear motor is actuated such that the linear motor compressor exhibits the specified state variable.
Claims20
1-2. (canceled)
The method according to claim 21, wherein the velocity of the free piston arrangement in the region of the opening point of the exhaust valve is reduced to a velocity lower than the mean velocity during the compression phase.
The method according to claim 21, wherein the velocity of the free piston arrangement in the region of the opening point of the inlet valve is reduced to a velocity lower than the mean velocity during the expansion phase.
(canceled)
The method according to claim 21, wherein the free piston arrangement is braked with a greater negative acceleration towards the end of the stroke, towards the top dead center, and is subsequently braked with a reduced negative acceleration, the free piston arrangement being braked at the top dead center with reduced negative acceleration until it comes to a standstill.
The method according to claim 21, wherein a stroke travel point and, assigned to this, a setpoint velocity of the free piston arrangement are specified as the state variable.
The method according to claim 21, wherein a nominal profile to be maintained along at least a partial section of the stroke path is specified as a state variable.
The method according to claim 21, wherein the linear motor compressor comprises a first and a second compression chamber which are operated in opposite directions by the free piston arrangement.
The method according to claim 21, wherein a velocity-displacement curve between at least one of
- the bottom dead center and the top dead center and
- the top dead center and the bottom dead center,
- according to which velocity-displacement curve the free piston arrangement is moved back and forth, is predetermined as a state variable.
The method according to claim 21, wherein the free piston arrangement, starting from the bottom dead center, is moved during a compression phase, up to the opening point of the exhaust valve, with a predetermined velocity-displacement curve, in such a way that the linear motor has to deliver a constant or substantially constant power as a function of time.
The method according to claim 21, wherein the predetermined state variable, a predetermined velocity-displacement curve at least in the range of one of the following points:
- opening point of the exhaust valve,
- closing point of the exhaust valve,
- opening point of the inlet valve,
- closing point of the inlet valve,
- has a reduced velocity compared to the rest of the velocity path, so that the outlet or inlet valve is moved at reduced velocity.
The method according to claim 21, wherein the linear motor exerts a positive force on the free piston arrangement acting in the direction towards the bottom dead center during the entire expansion phase.
The method according to claim 21, wherein the volume delivered by the linear motor compressor is changed by changing the maximum stroke of the linear motor or specifically by changing at least one of the location of the top dead center and the location of the bottom dead center.
The method according to claim 21, wherein the free piston arrangement is braked at least in sections during the reciprocating movement between the top dead center and the bottom dead center by operating the linear motor as a generator.
The method according to claim 21, wherein the linear motor is operated as a generator by supplying a pressurized fluid to the compression chamber via the outlet valve, expanding the fluid in the compression chamber, and subsequently discharging it via the inlet valve, and in that the free piston arrangement of the linear motor operated as a generator is moved back and forth with a predetermined velocity-displacement curve.
A linear motor compressor comprising at least one electric linear motor, a cylinder and a linearly movable free piston arrangement with at least one piston, the cylinder and the piston forming at least one compression chamber, the free piston arrangement being driven directly by the linear motor, the compression chamber being connected to the outside in a fluid-conducting manner via an outlet valve and an inlet valve, a control device controlling the linear motor in such a manner that the free piston arrangement is moved back and forth between a top dead center and a bottom dead center with a predetermined state variable,
- wherein the control device controls the free piston arrangement starting from the bottom dead center during a compression phase up to the opening point of the outlet valve and subsequently during an ejection phase up to the closing point of the outlet valve with a predetermined velocity-displacement curve, in such a way that the mean velocity during the compression phase is higher than the mean velocity during the ejection phase, and wherein the control device controls the free piston arrangement, starting from the bottom dead center during a compression phase up to the opening point of the outlet valve and subsequently during an ejection phase up to the closing point of the outlet valve with a predetermined velocity-displacement curve, in such a way that the free piston arrangement is first braked with a greater negative acceleration towards the end of the stroke, towards the bottom dead center, and is subsequently braked with a reduced negative acceleration, the free piston arrangement being braked at the bottom dead center with reduced negative acceleration until it comes to a standstill.
A method for operating a linear motor compressor comprising an electric linear motor, a cylinder, and a linearly movable free piston arrangement with a piston, wherein the cylinder and the piston form a compression chamber, wherein the free piston arrangement is driven directly by the linear motor and is moved back and forth along a stroke path between a top dead center and a bottom dead center, wherein a fluid is supplied to the compression chamber from the outside, wherein the supplied fluid is compressed or expanded in the compression chamber and is subsequently discharged to the outside again, wherein at least one state variable is preset for the linear motor compressor, and wherein the linear motor compressor is controlled in such a way that the linear motor compressor has the at least one preset state variable,
- wherein the free piston arrangement, starting from the bottom dead center during a compression phase up to the opening point of the outlet valve and subsequently during an ejection phase up to the closing point of the outlet valve, is driven with a predetermined state variable, a predetermined velocity-displacement curve, in such a way that the mean velocity during the compression phase is higher than the mean velocity during the ejection phase,
- wherein the free piston arrangement is first braked with a greater negative acceleration towards the end of the stroke, towards the bottom dead center, and is subsequently braked with a reduced negative acceleration, the free piston arrangement being braked at the bottom dead center with reduced negative acceleration until it comes to a standstill.
Dependencies are inferred from the claim text.