A linear compressor includes a cylinder, a frame, and a discharge unit. The discharge unit includes a discharge cover coupled with the frame, a discharge plenum disposed inside the discharge cover to define a plurality of discharge spaces, and an insulating plenum provided in a shape corresponding to an inner surface of the discharge cover to contact the inner surface of the discharge cover.

A linear compressor includes: a shell including an intake pipe configured to suction a refrigerant, a piston configured to reciprocate in an axial direction and including a piston body, and an intake muffler coupled to the piston and configured to flow the refrigerant into the piston body and reduce a noise from the refrigerant. The intake muffler includes a first muffler disposed inside the piston body, a second muffler disposed at a rear side of the first muffler and in fluid communication with the first muffler, and a third muffler including a third muffler body having a cylindrical shape with an empty interior and configured to accommodate a portion of a rear end of the first muffler and the second muffler in the third muffler body. The third muffler body includes a streamlined portion having diameters reduced toward a rear side of the third muffler body in the axial direction.

A refrigerating apparatus using a non-azeotropic mixed refrigerant may include a compressor operable in a continuous operation mode and configured to compress the non-azeotropic mixed refrigerant, a condenser configured to condense the refrigerant compressed by the compressor, an expander configured to expand the refrigerant condensed by the condenser, and an evaporator configured to evaporate the refrigerant expanded by the expander. A pressure difference (ΔP) of the non-azeotropic mixed refrigerant has a value included in a range of 340 kPa<ΔP<624.7 kPa. Therefore, reliability of components, such as a piston, in the refrigerating apparatus using the non-azeotropic mixed refrigerant may be further improved.

A linear compressor includes, a cylinder, a piston configured to reciprocate inside the cylinder, a motor configured to supply driving force to the piston, a detector configured to detect a motor current and a motor voltage that are applied to the motor, and a controller configured to estimate a stroke of the piston based on the motor current and the motor voltage and to determine a phase difference between the stroke and the motor current. The controller is configured to detect operation information of the linear compressor, determine whether to perform a resonance operation based on the operation information, and control operation of the motor to allow the phase difference to be within a preset phase range.

A linear compressor includes a housing defining a sump for collecting a lubricant and a pump for circulating a flow of lubricant within the housing. A heat dissipation or heat exchange assembly includes a plate mounted on a lower portion of the housing to define one or more fluid passageways between the plate and the housing. Hot oil is collected from the working components of the linear compressor and is passed through the one or more fluid passageways to discharge heat through the housing before the oil is returned to the sump.

A method for operating a variable capacity drive circuit of a compressor includes operating first and second four-quadrant switches in a first state in which the first four-quadrant switch is closed and the second four-quadrant switch is open such that a voltage seen by the motor is equal to an AC line voltage. The method also includes operating the first and second four-quadrant switches in a second state where the first four-quadrant switch is open and the second four-quadrant switch is closed such that the voltage seen by the motor is to zero. Further, the method includes providing a positive firing angle and a negative firing angle for defining when the first and second four-quadrant switches are operated in each of the first and second states. Moreover, the method also includes transitioning between the first and second states using the firing angles at a switching frequency determined by the AC line voltage frequency.

A heat pump is disclosed that has a hot displacer section and a cold displacer section with a linear actuator section disposed between the hot and cold displacer sections. By providing the linear actuator section between the displacers, the shafts that couple the actuators in the linear actuator section to their respective displacer is shorter than if the linear actuator section were located at the bottom of the cold displacer. The shorter shaft can be less stiff to avoid buckling. Due to a lesser propensity to cock, there is less friction of the shaft when reciprocating.

Provided are a linear compressor and a linear compressor control system that do not require a sensor for detecting a position of a mover, and can compute a mover position with high accuracy, in consideration of position dependency of an induced voltage constant. A linear compressor 20 includes a field element 11 having a first end connected to elastic bodies (201a and 201b) and including a permanent magnet 111, an armature 12 having a winding 122 wound around a magnetic pole 121, and a linear motor 10 that causes the field element 11 and the armature 12 to reciprocate relatively in an axial direction. A stroke of a piston is controlled so that a portion where a gradient of an induced voltage when the induced voltage computed on the basis of a voltage command value output to the linear motor 10 and a value of a current flowing through the winding 122 is at a predetermined value is within a predetermined range corresponds to a top dead center and/or a bottom dead center of a stroke of a piston 212 connected to a second end of the field element 11.

Provided is a linear compressor. The linear compressor includes a shell, a compressor body disposed in the shell, and a first support device coupled to a front portion of the compressor body in an axial direction to support the compressor body. The first support device may be disposed between an inner circumferential surface of the shell and the compressor body to support the compressor body in a radial direction.

A linear compressor includes: a shell including an intake pipe configured to suction a refrigerant, a piston configured to reciprocate in an axial direction and including a piston body, and an intake muffler coupled to the piston and configured to flow the refrigerant into the piston body and reduce a noise from the refrigerant. The intake muffler includes a first muffler disposed inside the piston body, a second muffler disposed at a rear side of the first muffler and in fluid communication with the first muffler, and a third muffler including a third muffler body having a cylindrical shape with an empty interior and configured to accommodate a portion of a rear end of the first muffler and the second muffler in the third muffler body. The third muffler body includes a streamlined portion having diameters reduced toward a rear side of the third muffler body in the axial direction.