Showing papers on "Linear compressor published in 2013"
TL;DR: A detailed and accurate experimental investigation of the flow field in a linear compressor cascade has been carried out at a Reynolds number of 3.82 × 105 based on the blade chord and the inlet free stream velocity.
Abstract: To gain a better knowledge of the mechanisms of corner separation and to obtain a database that could be used to calibrate large eddy simulation, a detailed and accurate experimental investigation of the flow field in a linear compressor cascade has been carried out at a Reynolds number of 3.82 × 105 based on the blade chord and the inlet free stream velocity. The experimental data include (1) the inlet flow conditions measured by one-dimensional hot-wire anemometry, (2) the static pressure on the blade and the endwall measured by pressure taps, (3) the outlet flow measured by a five-hole pressure probe, and (4) the velocity field in the passage measured by two-component laser Doppler anemometry. In this highly intermittent corner separation, the points with bimodal histograms of velocity exist and mainly appear around the mean interface of separated flow and non-separated flow. This bimodal phenomenon is due to two aperiodic modes in the flow field.
49 citations
TL;DR: In this article, the impact of dead (clearance) volume on both a linear and reciprocating compressor is analyzed and it is shown that the linear compressor remains relatively unaffected by an increase in dead volume up to a certain point.
Abstract: A comprehensive model of a linear compressor for electronics cooling was previously presented by Bradshaw et al. (2011) then enhanced and used for a sensitivity analysis of the leakage gap, eccentricity, and piston geometry by Bradshaw et al. (2013). The current work utilizes the previously developed model to explore the energy recovery characteristics of a linear compressor as compared to those of a reciprocating compressor. The impact of dead (clearance) volume on both a linear and reciprocating compressor is analyzed. In contrast to a reciprocating compressor the overall isentropic efficiency of the linear compressor remains relatively unaffected by an increase in dead volume up to a certain point. This behavior is attributed to the ability of the linear compressor to recapture the energy of the compressed gas during the expansion process. This characteristic behavior allows a linear compressor to be used for efficient capacity control from roughly 35–100%.
43 citations
TL;DR: In this article, an inherent capacity modulated (ICM) linear compressor was proposed and evaluated with the cooling capacity ratio varying from 50 to 100% at an evaporating temperature of −26 −C and a condensing temperature of 38 −C. The ICM linear compressor is capable of modulating its capacity independently without requiring stroke controllers.
Abstract: A linear compressor requires stroke controllers, as the piston movement is sensitive to the ambient temperature. This paper presents the performance characteristics of an inherent capacity-modulated (ICM) linear compressor. The compressor is capable of modulating its capacity independently without requiring stroke controllers. Electric parameters are designed to deliver inherent capacity modulation in accordance with variations in the cooling demand. An inherent capacity modulation method according to cooling demand levels was proposed and a prototype compressor was constructed. Its performance was evaluated with the cooling capacity ratio varying from 50 to 100% at an evaporating temperature of −26 °C and a condensing temperature of 38 °C. The total efficiency of the ICM linear compressor was as high as that of an electrical resonant system. This shows that the COP difference between the ICM linear compressor and the linear compressor controlled by an electrical resonance system appeared to be less than 1% over a wide cooling capacity ratio range of 50–100%. The results for the conventional linear compressor did not account for the power consumed by the electronic drive, so thus the ICM linear compressor had the potential improvement for energy saving.
38 citations
TL;DR: In this article, an improved linear compressor design is proposed for an electronics cooling application, with a predicted cooling capacity of 200 W a cylindrical compressor package size of diameter 50.3 mm and length 102 mm.
Abstract: A comprehensive model of a linear compressor for electronics cooling was previously presented by Bradshaw et al. (2011). The current study expands upon this work by first developing methods for predicting the resonant frequency of a linear compressor and for controlling its piston stroke. Key parameters governing compressor performance – leakage gap, eccentricity, and piston geometry – are explored using a sensitivity analysis. It is demonstrated that for optimum performance, the leakage gap and frictional parameters should be minimized. In addition, the ratio of piston stroke to diameter should not exceed a value of one to minimize friction and leakage losses, but should be large enough to preclude the need for an oversized motor. An improved linear compressor design is proposed for an electronics cooling application, with a predicted cooling capacity of 200 W a cylindrical compressor package size of diameter 50.3 mm and length 102 mm.
30 citations
01 May 2013
TL;DR: In this paper, a new design of moving magnet motor is introduced and the use of flexure springs, linear motors, valves and their integration are all discussed, and a ring down test indicates that the "viscous" damping in the linear compressor is acceptable (in terms of the decay ratio against the number of periods).
Abstract: Linear compressors with clearance seals and flexure bearings have been used for many years for space applications, and this article describes the development of linear compressors at Oxford. A new design of moving magnet motor is introduced and the use of flexure springs, linear motors, valves and their integration are all discussed. A ring down test indicates that the ‘viscous’ damping in the linear compressor is acceptable (in terms of the decay ratio against the number of periods). The measured motor characteristics compared well with the vector fields electromagnetic finite element model. With a revised structural design it is predicted that the motor efficiency would be 86% for the rated power (200W shaft power at 50 Hz) enabling the linear compressor to have a high overall efficiency. The companion paper covers the experimental evaluation of the linear compressor.
28 citations
TL;DR: In this paper, a double-acting thermoacoustic cryocooler is presented, which consists of three or six units, each composed of a thermo-acoustic converter and a linear compressor.
26 citations
TL;DR: In this article, the experimental analysis of a mini VCS for electronic thermal management in avionic applications is presented, where the cold plate was equipped with 15 thermocouples in order to monitor the wall temperature distribution.
Abstract: This paper reports the experimental analysis of a mini Vapor Cycle System (VCS) for electronic thermal management in avionic applications. The water cooled miniature scale refrigeration system uses R134a as working fluid and implements a new concept oil-free linear compressor prototype. In the range of operating test conditions investigated the pressure ratio varies from 1.54 to 3.75, the cooling capacity of the system varied from 37 W to 374 W, while the coefficient of performance (COP) ranged between 1.04 and 5.80. Particular attention was dedicated to the cold plate design, which had to meet the requirements established by aeronautical standards. The cold plate was equipped with 15 thermocouples in order to monitor the wall temperature distribution. The suitability and feasibility of the proposed cold plate for electronic thermal management in an aeronautical environment is critically discussed, based on the experimental results.
24 citations
TL;DR: In this article, a single-stage Stirling-type pulse tube cryocooler (SPTC) with a dual-opposed linear compressor has been built and tested, achieving a no-load temperature of 18.6 K and 0.2 W/20 K at the frequency of 38 Hz.
22 citations
TL;DR: In this article, the potential of passive tip leakage flow control to increase the aerodynamic performance of highly loaded compressor blades was investigated and it was shown that the suction-side winglets are aerodynamically superior to the pressure-side or combined winglets.
21 citations
Patent•
28 Feb 2013TL;DR: In this paper, the authors present a system including a condenser, a linear compressor, and at least two evaporators operating in parallel with one another with at least one evaporator associated with the refrigerator compartment that operates at a first refrigerant fluid pressure and with other evaporators associated with a freezer compartment that operate at a second fluid pressure.
Abstract: A refrigeration system including a condenser; a (single) linear compressor that is activated and deactivated by a pulse width modulation switching device; a pulse width modulation refrigerant flow switch; at least two evaporators operably connected in parallel with one another with at least one evaporator associated with the refrigerator compartment that operates at a first refrigerant fluid pressure and with at least one other evaporator associated with the freezer compartment that operates at a second refrigerant fluid pressure; and a plurality of refrigerant fluid conduits operably connecting the condenser, the linear compressor and the evaporators into a refrigerant fluid flow circuit and such that the evaporators are capable of running simultaneously at different pressure levels and refrigerant flows from the evaporators, to the pulse width modulation refrigerant flow switch and through the pulse width modulation refrigerant flow switch.
16 citations
07 Apr 2013
TL;DR: In this article, three designs of linear permanent magnet motors (LPMM) having moving magnets armature, are proposed for driving a direct drive linear reciprocating compressor in household refrigerator.
Abstract: In this paper, three novel designs of linear permanent magnet motors (LPMM) having moving magnets armature, are proposed for driving a direct drive linear reciprocating compressor in household refrigerator. The designs are then compared, including the configurations and static characteristics based on finite element analysis (FEA). In contrast to a conventional reciprocating compressor, a direct-drive linear compressor in which the piston is driven directly by a linear motor (LM) and resonant springs is considered a positive displacement. The analysis on performance of LPMM using the proposed designs is carried out on the magnetic flux-lines, magnetic field intensity, magnetic flux density, back-EMF and thrust force. The extensive simulation results indicate the effectiveness of the proposed designs.
TL;DR: In this article, the acoustic impedance characteristics of a linear compressor were investigated, including the current, the piston displacement, the pressure amplitude, the electrical power dissipation, the power factor, and the pressure-volumetric (PV) power delivered.
Abstract: The acoustic field of a linear compressor serves to deliver the compression work to the load, such as the connected cold head of a cryocooler; it plays an equivalently important role as the electrical and mechanical parts, especially in the impedance match issue. This paper studies the acoustic impedance characteristics of a linear compressor. The parameters including the current, the piston displacement, the pressure amplitude, the electrical power dissipation, the power factor, the pressure-volumetric (PV) power delivered, and the efficiency are theoretically and experimentally investigated. Different from previous theoretical studies, optimization for the operations away from the resonance is also included. More general optimization results imply relevance between thermoacoustic engines and linear compressors. The predicted results are validated by the experiments performed on a linear compressor with an adjustable resistive-capacitive (RC) acoustic load. The comparisons between the calculations and the measurements are presented and analyzed. The results provide deeper insight into the mechanism of the linear compressor and the impedance match in a cryocooler system.
25 Apr 2013
TL;DR: In this paper, a low-cost moving magnet oil-free linear compressor is described, and follows a companion paper on the linear motor system, which enables corrections to be made for the phase lag in the voltage, current and displacement measurements.
Abstract: Oil-free compressors are required for various applications, including cryocoolers and refrigeration systems that use compact evaporators. A novel low-cost moving magnet oil free linear compressor is described here, and follows a companion paper on the linear motor system. The experimental apparatus to evaluate the thermodynamic performance of the linear compressor is comparatively straightforward, but the data analysis is involved, since key measurements have to be corrected for the phase response of the transducers. Harmonic fitting, using fast Fourier transform with zeropadding and minimisation algorithms, have been used for the voltage, current and displacement signals. This enables corrections to be made for the phase lag in the voltage, current and displacement measurements. The experiments using nitrogen, with a constant pressure ratio, show that the linear motor system under resonance achieves a high overall efficiency. For the design point, the motor efficiency is 74%, while for a pressure ratio of 3.0, the average overall adiabatic efficiency is 54% and the isothermal efficiency is 46%, all of which are within a reasonable range for a small compressor.
Patent•
05 Jun 2013
TL;DR: In this article, a multi-stage pulse tube refrigerator adopting a relay linear compressor is presented, where the relay linear compressors are used for compressing the air passing through the pipeline.
Abstract: The utility model discloses a multi-stage pulse tube refrigerator adopting a relay linear compressor. The multi-stage pulse tube refrigerator comprises a compressor, a regenerator hot end heat exchanger, a high-temperature section regenerator, high-temperature section regenerator cold end heat exchangers, a first-stage pulse tube, a first-stage pulse tube hot end heat exchanger and first-stage phase-modulating parts, which are sequentially communicated. The multi-stage pulse tube refrigerator further comprises a low-temperature section regenerator, low-temperature section regenerator cold end heat exchangers, a second-stage pulse tube, a second-stage pulse tube hot end heat exchanger and second-stage phase-modulating parts which are sequentially communicated. The cold end of the high-temperature section regenerator is connected with the hot end of the low-temperature section regenerator through a pipeline, and the pipeline is provided with the relay linear compressor which is used for compressing the air passing through the pipeline. The pressure ratio of the cold end of the high-temperature section regenerator of the multi-stage pulse tube refrigerator adopting the relay linear compressor is further increased, consequently, a high pressure ratio is obtained at the cold end of the multi-stage pulse tube refrigerator, and the efficiency of the multi-stage pulse tube refrigerator is ultimately increased; and meanwhile, the multi-stage pulse tube refrigerator has the advantages of being compact in structure, long in service life, high in reliability and the like.
Patent•
29 May 2013
TL;DR: In this paper, a linear compressor supported by three kinds of springs is presented, where a support, a cylinder fixed with the support, two pistons in clearance fit with the inner wall of the cylinder, and two linear motors driving the two piston shafts to make coaxial and reciprocating motions.
Abstract: The invention discloses a linear compressor supported by three kinds of springs. The linear compressor supported by the three kinds of springs comprises a support, a cylinder fixed with the support, two pistons in clearance fit with the inner wall of the cylinder, and two linear motors driving the two pistons to make coaxial and reciprocating motions, wherein the two linear motors are in transmission with the pistons correspondingly and respectively through piston shafts, two end portions of each piston shaft are fixed with the support respectively through a vortex arm plate spring assembly and a linear arm plate spring assembly, the vortex arm plate spring assemblies are close to the pistons, and a cylinder spiral spring used for providing axial elastic force is arranged between an end portion, far away from a corresponding piston, of each piston shaft and the support. Due to the fact that the linear compressor is supported by the three kinds of springs, clearance gap seal and oil-free lubrication technology are guaranteed, and axial rigidity of the springs is effectively improved. For a linear compressor with big rotor quality, high frequency resonance operation is achievable, operating efficiency is improved, and character match between the linear compressor and a cooling head of a low temperature refrigerator is achieved.
03 Jun 2013
TL;DR: In this article, the authors proposed a compensation algorithm of current measurement error for single-phase linear compressor in home appliances by using a PR(Proportional-Resonant) controller.
Abstract: This paper proposes a novel compensation algorithm of current measurement error for single-phase linear compressor in home appliances. Current measurement error which may be problem, when use the DC link divided into two capacitors in half-bridge inverter, causes the unbalanced DC link voltage. In order to compensate the current measurement error, the synchronous reference frame transformation is used for detecting the measurement error. When the output current of the half-bridge inverter includes offset error, the d-axis current has a ripple of fundamental frequency. By using a PR(Proportional-Resonant) controller, first harmonic can be removed and can be compensated measurement error. The proposed compensation method can be easily implemented without much computation and additional hardware circuit. The validity of the proposed algorithm is verified through simulations.
01 Nov 2013
TL;DR: In this paper, the performance of the linear compressor using a PWM inverter such as the efficiency is investigated with the variations of both mechanical resonant frequency and electrical resonance frequency.
Abstract: Recently, the linear compressors with the free piston driven by the linear motor have widely attention in the cooling apparatus such as a refrigerator due to high efficiency. The method of using triacs as a linear motor drive is not satisfactory to improve the efficiency of the linear compressor. In this paper, the performance of the linear compressor using a PWM inverter such as the efficiency is investigated with the variations of both mechanical resonant frequency and electrical resonant frequency. The control loop for controlling both the piston stroke and efficiency is suggested. Through simulation and experimental studies, the performance of both the stroke and angle controls for improving the efficiency of the linear compressor is verified.
01 Dec 2013
TL;DR: Linear compressor is one of the promising components for household refrigerators, with the advantage of simple structure, light weight, high efficiency, lower resonance and noisy as discussed by the authors, and the research status and developing trend of linear compressor are presented The structure, the operation principle and the characteristics of the moving-coil, moving-magnet, and moving-iron type linear compressor were analyzed in details.
Abstract: Linear compressor is one of promising components for household refrigerators, with the advantage of simple structure, light weight, high efficiency, lower resonance and noisy In this paper, the researching status and developing trend of linear compressor are presented The structure, the operation principle and the characteristics of the moving-coil, moving-magnet, and moving-iron type linear compressor are analyzed in details The features of linear switched reluctance actuator are investigated, and it is recommended to be a competitive candidate for linear compressor in household refrigerators
Patent•
24 Apr 2013
TL;DR: In this paper, a pulse tube/Stirling gas coupling composite multi-stage refrigerator which comprises a Stirling refrigeration unit and a PULSE unit was presented. But the performance of the multi-staging PULSA was not analyzed.
Abstract: The invention discloses a pulse tube/Stirling gas coupling composite multi-stage refrigerator which comprises a Stirling refrigeration unit and a pulse tube refrigeration unit, wherein the Stirling refrigeration unit and the pulse tube refrigeration unit are connected in a gas coupling mode and are driven by one same linear compressor; an opening part of an air cylinder of the Stirling refrigeration unit is fixed with a cold end heat exchanger of the pulse tube refrigeration unit in a sealing manner; an end part (filled with return heat fillers) of a discharger inside the Stirling refrigeration unit penetrates through a hot end heat exchanger, a first-stage pulse tube refrigerator return heater and a first-stage cold end heat exchanger of the pulse tube refrigeration unit in sequence, and is arranged inside the air cylinder; and the discharger is coaxially arranged with the first-stage pulse tube refrigerator return heater and is matched in a sliding manner. According to the pulse tube/Stirling gas coupling composite multi-stage refrigerator, multi-stage performances are all considered, so that optimal performances and the high reliability can be obtained; and compared with the conventional multi-stage pulse tube refrigerator, the pulse tube/Stirling gas coupling composite multi-stage refrigerator can obtain a large pressure ratio from the cold end through the control of the discharger, so that the lower refrigeration temperature and the large refrigeration amount can be obtained.
TL;DR: In this paper, a mixed-gas Joule-Thomson cooling system is investigated in which a micromachined JT cold stage of 60 × 10 × 0.7mm3 is combined with a linear compressor.
Patent•
21 Aug 2013
TL;DR: In this paper, a linear compressor of an air conditioner and a refrigerator is described, and a dynamic balancer is used to connect the compressor with the shell of the compressor.
Abstract: The invention discloses a linear compressor of an air conditioner and a refrigerator. The linear compressor of the air conditioner and the refrigerator comprises a shell and a compressing mechanism which is accommodated in the shell and fixed with the shell through a shell support. The compressing mechanism comprises a piston and a linear motor which drives the piston to move along an actuating shaft of the compressing mechanism. The compressing mechanism is connected with the shell through a dynamic balancer. The dynamic balancer comprises a rotor, a first elastic assembly which is connected with the rotor and the actuating shaft and a second elastic assembly which is connected with the rotor and the shell support. According to the linear compressor of the air conditioner and the refrigerator, vibration of the compressor is greatly reduced, and vibration output is zero under a theoretical condition. In addition, the method that the outer side of the rotor of the dynamic balancer is connected with the first elastic assembly and the inner side of the rotor of the dynamic balancer is connected with the second elastic assembly enables the dynamic balancer to be compact in structure, convenient to install and easy to debug.
Patent•
18 Dec 2013
TL;DR: In this paper, a cylindrical-shaped magnetic field positioning linear compressor with two stators and two rotors is presented, which is axially provided with two pairs of tile-shaped permanent magnets and two Stators Stator iron cores are disposed at an interval in an axial direction.
Abstract: The utility model discloses a cylindrical-shaped magnetic field positioning linear compressor, which is axially provided with two pairs of tile-shaped permanent magnets and two stators Stator iron cores are disposed at an interval in an axial direction, when the two end parts of a pair of tile-shaped permanent magnets are aligned with the two end parts of the stator iron cores, the end parts of the outer sides of the other pair of tile-shaped permanent magnets are aligned with the middle positions of the stator iron cores The rotor permanent magnets are anisotropic When alternating current is provided for an annular-shaped winding coil, the two stators can generate two radial alternating magnetic fields having different polarities The stator magnetic fields and the rotor permanent magnetic fields can interact with each other, and therefore the rotors can carry out the straight reciprocating motion under the suspension state along the axial direction The attraction force and the thrust force of the two rotors can be generated by the stator magnetic fields, and at the same time, the objects of buffering, positioning, and controlling the routes of the rotors can be effectively achieved The magnetic field positioning linear compressor has advantages of simple structure, low costs, light weight, high efficiency, and convenient processing and manufacturing
Patent•
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28 Jun 2013
TL;DR: In this paper, a linear compressor with a permanent magnet is described, which is capable of reciprocating in the cylinder and has a first measured hardness value and a second hardness value at which a hardness difference from the first hardness difference is formed to be at least a predetermined value.
Abstract: The present invention relates to a linear compressor The linear compressor according to an embodiment of the present invention includes a shell that is provided with a refrigerant suction unit; an outer stator that is provided in the shell and is provided with a coil; an inner stator that is arranged apart from the outer stator; a permanent magnet that is movably arranged between the outer stator and the inner stator; a cylinder including a compression space in which a refrigerant suctioned by the refrigerant suction unit is compressed; a piston that is coupled with the permanent magnet and is provided to be capable of reciprocating in the cylinder; a first surface treatment section that is provided in the piston and has a first measured hardness value; and a second surface treatment section that is provided in the cylinder and defines a second hardness value at which a hardness difference from the first hardness value is formed to be at least a predetermined value
TL;DR: In this paper, the performance of the linear compressor using a PWM inverter such as the efficiency is investigated with the variations of both mechanical resonant frequency and electrical resonance frequency.
Abstract: Recently, the linear compressors with the free piston driven by the linear motor have widely attention in the cooling apparatus such as a refrigerator due to high efficiency. The method of using triacs as a linear motor drive is not satisfactory to improve the efficiency of the linear compressor. In this paper, the performance of the linear compressor using a PWM inverter such as the efficiency is investigated with the variations of both mechanical resonant frequency and electrical resonant frequency. The control loop for controlling both the piston stroke and efficiency is suggested. Through simulation and experimental studies, the performance of both the stroke and angle controls for improving the efficiency of the linear compressor is verified.
Journal Article•
TL;DR: In this article, an in-housc made single-stage pulse-tube cryocooler with inline configuration of regenerator and pulse tube was optimized for high cooling power near 80 K.
Abstract: An in-housc made single-stage pulse-tube cryocooler with inline configuration of regenerator and pulse tube was optimized for high cooling power near 80 K.The cooler is driven by a 10 kW-class linear compressor with dual opposed pistons,and the regenerator is designed with a small length to diameter ratio.To overcome the losses caused by temperature inhomogeneity,the transverse heat conductance in the regenerator was increased by use of hybrid type fillings,where the stainless wire mesh was inserted together with materials with higher thermal conductance,such as copper and brass mesh.Using these types of regenerator fillings,the losses from streaming were significantly reduced and the minimum no-load temperature was lowered from 54 to 47.5 K.The mean pressure and frequency of the pressure oscillation were also optimized.Up to now,a cooling power of 298 W at 71 K is available with an input power of 8.9 kW.
Patent•
23 Oct 2013
TL;DR: In this article, a high efficiency and inexpensive linear compressor consisting of a sealed vessel, a piston arranged in the cylinder, a sealing ring arranged between the cylinder and the sealed vessel and a ring-shaped narrow gap formed by the outer circumferential surface of the piston and the inner circumference of the cylinder is presented.
Abstract: A high efficiency and inexpensive linear compressor comprises a sealed vessel, lubricant arranged at the bottom of the sealed vessel, a cylinder arranged in the sealed vessel, a piston arranged in the cylinder, a sealing ring arranged between the cylinder and the sealed vessel, a ring-shaped narrow gap formed by the outer circumferential surface of the piston and the inner circumferential surface of the cylinder, a high-pressure oil hole formed in the cylinder, an inhalation path formed in the front part of the piston, a gas suction valve arranged at the top end of the piston, an exhaust valve arranged at the top end of the cylinder, a linear motor composed of an outer stator, a stator coil, an inner stator and a permanent magnet and arranged in the sealed vessel, an elastic device connected with the piston via a connector, and an oil suction device connected between a low pressure region and the inhalation path. The high efficiency and inexpensive linear compressor has the following advantages: 1, the structural design is reasonable and simple, and the assembling is convenient; 2, the cost is greatly reduced; 3, the design of the oil path is reasonable, so that the abrasion of the cylinder and the piston is low.
01 Jan 2013
TL;DR: In this article, a linear permanent magnet motors (LPMM) with moving magnets armature and slotted stator is proposed to drive a linear reciprocating compressor in a household refrigerator.
Abstract: In this paper, t wo novel designs of linear permanent magnet motors (LPMM) with moving magnets armature and slotted stator are proposed. The aim of the designs is to drive a linear reciprocating compressor in a household refrigerator. The designs are analyzed and compared with conventional rectangular permanent magnets (PM) array, by evaluating their configurations and static characteristics based on finite element analysis (FEA). In contrast to a conventional reciprocating compressor, a direct-drive linear compressor in which the piston is driven directly by a linear motor (LM) and resonant springs is considered a positive displacement. The analysis on perfo rmance of LPMM using the proposed designs is carried out on the open-circuit magnetic field distribution, thrust force, flux-linkage, winding inductance, back-EMF and cogging force. The extensive simulation results indicate the effectiveness of the propose d designs and their superiority of the conventional design with rectangular PMs array.
TL;DR: In this paper, a variable step Newmark method was used to solve the system equations of a free piston linear compressor with a coil wire diameter and stroke and cylinder diameter, and the efficiency of the linear compressor and current of the coil were analyzed with the same exhaust volume and different stroke and cylinders diameter.
Abstract: Recently linear compressor with a free piston is widely paid attention to for its high efficiency. This paper presents parameters optimization of linear compressor used for Refrigerator. The system equations of linear compressor are established through system analysis and solved by variable step Newmark method. The piston movement, current, input power, effective work, resistive loss, damping loss and efficiency are calculated for the optimization from the system equations. Coil wire diameter, stroke and cylinder diameter are important parameters of linear compressor, which have great importance on its performance. The coil wire diameter was changed to find out its affect to loss of resistance. The efficiency of linear compressor and current of the coil are analyzed with the same exhaust volume and different stroke and cylinder diameter. Through the analysis the parameters of the linear compressor are optimized.
Patent•
14 Aug 2013
TL;DR: In this paper, a J-T throttle cooling cycle system driven by a low-temperature linear compressor is presented, where the compressor is operated in low temperature, the pressure loss of cooling agents caused by a counter-flow type heat exchanger is reduced and the pressure ratio between two ends of the throttle valve is increased.
Abstract: The utility model discloses a J-T throttle cooling cycle system driven by a low-temperature linear compressor. The J-T throttle cooling cycle system driven by the low-temperature linear compressor comprises a cooling unit and a pre-cooling unit, wherein the cooling unit comprises a first-stage low-temperature linear compressor, a throttle pre-heat-exchanger, a throttle valve and an evaporator, and the pre-cooling unit comprises a first-stage pre-cooling heat exchanger and a pre-cooling mechanism. The outlet of the first-stage low-temperature linear compressor is communicated with a high-temperature side pipeline of the first-stage pre-cooling heat exchanger, a high-temperature side pipeline of the throttle pre-heat-exchanger, the throttle valve, a low-temperature side pipeline of the throttle pre-heat-exchanger and the inlet of the compressor in sequence through pipelines, and thus a circulation loop is formed. The outlet of the pre-cooling mechanism is communicated with a low-temperature pipeline of the throttle pre-heat-exchanger, a surface coil pipe of the first-stage low-temperature linear compressor and the inlet of the pre-cooling mechanism in sequence through pipelines, and thus a circulation loop is formed. According to the J-T throttle cooling cycle system driven by the low-temperature linear compressor, the compressor which is operated in low temperature is adopted, the pressure loss of cooling agents caused by a counter-flow type heat exchanger is reduced, the pressure ratio between two ends of the throttle valve is increased, and the J-T throttle cooling performance is improved.
Patent•
01 May 2013
TL;DR: In this paper, an annular magnet is formed by jointing at least two magnet components together, and the jointed portions between the annular magnets and the rotor frame and the outer periphery of the magnet are adhered with a carbon fiber layer respectively for fixation.
Abstract: The utility model provides a rotor of a linear compressor motor. The rotor comprises a rotor frame, and an annular magnet which is fixed on the rotor frame. The annular magnet is formed by jointing at least two magnet components together, and the jointed portions between the annular magnet and the rotor frame and the outer periphery of the annular magnet are adhered with a carbon fiber layer respectively for fixation. The utility model further provides a motor used in a linear compressor, and a linear compressor. By using the magnet ring formed by assembling magnet components, the machining and manufacturing of the magnet ring can be facilitated. Meanwhile, the magnet components are fixed by winding a carbon fiber layer to form the annular magnet, so the machining and manufacturing of the magnet ring can be facilitated, and the advantage of high molding efficiency can be realized.