CN102052420A - Linear compressor with magnetic spring structure - Google Patents

Linear compressor with magnetic spring structure Download PDF

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Publication number
CN102052420A
CN102052420A CN 201010600482 CN201010600482A CN102052420A CN 102052420 A CN102052420 A CN 102052420A CN 201010600482 CN201010600482 CN 201010600482 CN 201010600482 A CN201010600482 A CN 201010600482A CN 102052420 A CN102052420 A CN 102052420A
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China
Prior art keywords
compressor
magnetic spring
magnet
piston
permanent
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CN 201010600482
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Chinese (zh)
Inventor
畅云峰
张金权
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Xian Jiaotong University
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Xian Jiaotong University
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Priority to CN 201010600482 priority Critical patent/CN102052420A/en
Publication of CN102052420A publication Critical patent/CN102052420A/en
Pending legal-status Critical Current

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Abstract

The invention relates to a magnetic spring structure and a linear compressor structure thereof, in particular relating to a linear compressor with a magnetic spring structure. The linear compressor is characterized in that a magnetic spring assembly is composed of a permanent moving magnet and a permanent stationary magnet, the permanent stationary magnet is fixed on a compressor body, and the permanent moving magnet, a piston and a motor rotor constitutes a piston motion assembly; under the action of alternating thrust of a motor, the piston motion assembly makes a reciprocating linear motion along the axial direction of the motor so as to complete a process comprising the steps of expansion, air suction, compression and air exhaust of the compressor; and meanwhile, under the action of mutual magnetic forces, the permanent moving magnet and the permanent stationary magnet are acted as energy-storage components. The linear compressor with a magnetic spring structure has the advantages that the equivalent stiffness coefficients of the permanent magnets can be changed through changing the diameters, coercive forces and remanence strengths of the permanent magnets; when the compressor is in a large piston stroke, the compressor still has high performances and reliability; and because the magnetic spring is simple in structure, the permanent moving magnet part of the magnetic spring can be inlaid on the piston, so that the structure of the linear compressor is more compact and the volume thereof is smaller.

Description

A kind of linear compressor with magnetic spring structure
Technical field
The present invention relates to a kind of magnetic spring structure and linear compressor thereof, specifically a kind of linear compressor with magnetic spring structure.
Background technique
Traditional gas compressor is a kind of reciprocating piston mechanism with connecting rod, crank-connecting rod is converted into rotatablely moving of motor the linear reciprocating motion of piston, because piston is subjected to the effect of lateral force, need oil lubrication between itself and the cylinder wall, shortcoming such as make that this traditional air compressor exists that volume is big, complex structure, noise are big, gas oil-containing, application are restricted.
Linear compressor is a kind of power machine of being done linear reciprocating motion by the direct driven plunger of linear electric motor, because suffered gas force, electromagnetic force and the friction damping force of its piston all distributes along the piston motion direction, therefore, make this new type compressor have mechanical efficiency height, compact structure, volume little, realize advantages such as oil-free lubrication and variable volume controlled easily, be subjected to the extensive concern of each big research institution and manufacturer both at home and abroad.
Linear compressor is under the effect of alternating electromagnetic force, relies on the resonance of spring to drive the cyclic process that piston is finished the air-breathing-compression-exhaust-expansion of compressor.Spring is a kind of stored energy mechanism, and it can release energy in the process of compressor compresses and exhaust, expand and air-breathing process in stored energy.Resonant springs in the conventional linear compressor generally adopts cylindrically coiled spring and flat spring structure, because its special mechanical structure makes that the stiffness coefficient of this mechanical spring is a constant.But the rational Match of the frequency of okperation of the Performance And Reliability of linear compressor and compressor assembly and natural frequency is relevant, and when the system works frequency equated with natural frequency, the compressor efficiency of this moment was the highest, and performance is the most stable.The natural frequency of linear compressor is not only relevant with motion assembly quality and spring rate, also be subjected to the influence of exhaust pressure and piston stroke, the stiffness coefficient of mechanical spring is certain in the regular hour, and along with the increase of time, its stiffness coefficient can diminish, when the operating conditions of compressor changes, the natural frequency of system can change, make frequency of okperation and natural frequency not match, reduced the performance of compressor, simultaneously, mechanical spring is under big piston stroke, and its reliability and stability descend.
Gas spring is a kind of resonant springs that becomes stiffness coefficient that has, can be used for linear compressor, but because gas leakage can take place in it, its performance and reliability have been had a strong impact on, improve its Performance And Reliability and need increase self-making-up air device, can increase the complexity of air spring processing and manufacturing process like this.
Summary of the invention
The present invention proposes a kind of magnetic spring structure and linear compressor thereof, specifically a kind of linear compressor with magnetic spring structure.This magnetic spring is by forever moving magnet and forever deciding magnet two-part and form, by changing diameter, coercivity and the residual magnetization of permanent magnet, can change its equivalent stiffness coefficient, simultaneously, when big piston stroke, compressor still can have high performance and reliability.Because it is simple in structure, the permanent moving magnet part of magnetic spring can be embedded on the piston, makes the linear compressor structure compact more, and volume is littler.
The objective of the invention is to overcome the deficiencies in the prior art, a kind of linear compressor structure with magnetic spring structure is provided.
A kind of magnetic spring is characterized in that: described magnetic spring structure comprises:
Described magnetic spring E comprises permanent moving magnet 5 and forever decides magnet 6.
A kind of linear compressor with magnetic spring structure comprises:
Magnetic spring E, moving piston assembly D, linear electric motor C, compressor block B and outlet valve A;
Described magnetic spring E comprises permanent moving magnet 5 and forever decides magnet 6;
Described moving piston assembly D comprises electric mover 3, piston 7 and permanent moving magnet 5;
Described linear electric motor C comprises electric motor internal stator 1, motor external stator 2, mover 3 and coil 4, and mover 3 combines as a whole with piston 7 and permanent moving magnet 5;
Described compressor block B, fixedly linear electric motor inner stator 1, external stator 2 reach and forever decide magnet 6.
The permanent moving magnet 5 of described magnetic spring E is embedded on the piston assembly D.
The magnet edge 6 of forever deciding of described magnetic spring E is embedded on the compressor block.
Described moving piston assembly D does linear reciprocating motion in the effect lower edge of motor alternation thrust electrical axis direction, thereby finishes the air-breathing-compression-exhaust process of compressor.
A kind of linear compressor with magnetic spring structure among the present invention has overcome the existing natural frequency of prior art cathetus compressor and frequency of okperation is difficult to mate, Performance And Reliability hangs down defectives such as reaching difficult processing under big piston stroke, make the linear compressor structure compact more, volume is littler, Performance And Reliability is not influenced by operating mode, processing is simple, has great importance for performance, reliability and the life-span of improving linear compressor.
Description of drawings
Fig. 1 is a magnetic spring schematic diagram of the present invention;
Fig. 2 is the compressor equivalent model figure of magnetic spring of the present invention;
Fig. 3 is the linear compressor structural drawing with magnetic spring structure of the present invention;
Fig. 4 is the linear compressor structural drawing with magnetic spring structure of specific embodiments of the invention 1;
Embodiment
Accompanying drawing is the specific embodiment of the present invention;
Below in conjunction with accompanying drawing content of the present invention is described in further detail:
Fig. 1 is a kind of magnetic spring schematic diagram, is made up of three-group permanent-magnet, and two permanent magnets are in stationary state up and down, and middle permanent magnet is in the unrestricted motion state.Put in the same way between the permanent magnet, middle moving magnet is subjected to the repulsive force F of fixed magnet up and down 1And F 2Effect, when being zero when making a concerted effort, moving magnet is in state of equilibrium.Under the action of gravity of not considering moving magnet itself, moving magnet is suffered make a concerted effort be
F s ( x ) = π B r H c d 2 8 μ 0 { ( 1 - x m 0 - x ( t ) d 1 + ( x m 0 - x ( t ) d ) 2 ) 2 - ( 1 - x m 0 + x ( t ) d 1 + ( x m 0 + x ( t ) d ) 2 ) 2 }
In the formula, F sBe magnetic force; X (t) is the displacement of moving magnet; D is the magnet radius; B rBe remanent magnetism; H cBe coercivity; u 0Be permeability of vacuum; x M0Be the moving magnet initial position.
But the equivalent port stiffness coefficient approximate representation of magnetic spring is
K s = π B r H c d 2 8 μ 0 x = k m x
By following formula as can be known, the stiffness coefficient of magnetic spring is linear, increases k along with the increase of moving magnet displacement mBe the magnetic force coefficient of magnetic spring, relevant with the structural parameter and the magnetic force property of moving magnet and fixed magnet.
Fig. 2 is the compressor equivalent model figure of magnetic spring, and the natural frequency of resonator system is
f d = 1 2 π [ K s m + βn P d A p mS - ( S + 5.35 m ) 2 ] 1 / 2
By following formula as can be known, the natural frequency of system is relevant with piston motion assembly quality, piston stroke and sectional area, spring rate and exhaust pressure.Because the equivalent stiffness coefficient of magnetic spring is linear, increases along with the increase of piston stroke.When frequency of okperation when natural frequency under the declared working condition equates, when exhaust pressure is constant, increase piston stroke, the equivalent stiffness coefficient of magnetic spring can increase, thereby make natural frequency can not depart from frequency of okperation, thereby improved the Performance And Reliability of compressor.
The invention provides a kind of linear compressor with magnetic spring, as shown in Figure 3, it mainly is made up of outlet valve A, compressor block B, linear electric motor C, piston motion assembly D and magnetic spring assembly E.Linear electric motor C is made up of electric motor internal stator, motor external stator, mover and coil, when leading to an alternating current to motor coil, can produce the electromagnetic field of alternation in the air gap between interior external stator, mover is done linear reciprocating motion in the effect lower edge of alternating electromagnetic field electrical axis direction.Piston motion assembly D is made up of electric mover, piston and permanent moving magnet, and it does linear reciprocating motion in the effect lower edge of motor alternation thrust electrical axis direction, thereby finishes the expansion-air-breathing-compression-exhaust process of compressor.Magnetic spring assembly E is by forever moving magnet and forever deciding magnet and form, forever deciding magnet is fixed on the compressor block B, permanent moving magnet and piston and electric mover are together formed the piston motion assembly, when the piston motion assembly is done linear reciprocating motion, forever move magnet 5 and forever decide magnet 6 plays energy-storage travelling wave tube under the effect of mutual magnetic force effect.
Referring to shown in Figure 4, a kind of linear compressor with magnetic spring structure has mainly comprised outlet valve A, compressor block B, linear electric motor C, piston motion assembly D and magnetic spring assembly E etc.Linear electric motor C is made up of electric motor internal stator 1, motor external stator 2, mover 3 and coil 4, when leading to an alternating current for motor coil 4, can produce the electromagnetic field of alternation in the air gap between interior external stator, mover 3 is done linear reciprocating motion in the effect lower edge of alternating electromagnetic field electrical axis direction.Magnetic spring assembly E is by forever moving magnet 5 and forever deciding magnet 6 and form, forever deciding magnet 6 is fixed on the compressor block B, permanent moving magnet 5 is together formed piston motion assembly D with piston 7 and electric mover 3, piston motion assembly D does linear reciprocating motion in the effect lower edge of motor alternation thrust electrical axis direction, thereby finish the expansion-air-breathing-compression-exhaust process of compressor, the while is forever moved magnet 5 and forever decides magnet 6a and 6b play energy-storage travelling wave tube under the effect of mutual magnetic force effect.
When compressor is in expansion and suction condition, compressor piston motion assembly D moves away from outlet valve A, the permanent moving magnet 5 of magnetic spring assembly E is to forever deciding magnet 6a motion, when compressor piston moving displacement during less than the piston initial rest position, magnetic spring power reduces along with the increase of piston displacement, and direction is identical with the piston displacement direction; When compressor piston moving displacement during greater than the piston initial rest position, magnetic spring power increases along with the increase of piston displacement, and direction is opposite with the piston displacement direction.
When compressor is in compression and exhaust condition, compressor piston motion assembly D moves to outlet valve A, the permanent moving magnet 5 of magnetic spring assembly E is to forever deciding magnet 6b motion, when compressor piston moving displacement during greater than the piston initial rest position, magnetic spring power reduces along with the increase of piston displacement, and direction is identical with the piston displacement direction; When compressor piston moving displacement during less than the piston initial rest position, magnetic spring power increases along with the increase of piston displacement, and direction is opposite with the piston displacement direction.
Above content is to further describing that the present invention did in conjunction with concrete preferred implementation; can not assert that the specific embodiment of the present invention only limits to this; for the general technical staff of the technical field of the invention; without departing from the inventive concept of the premise; can also make some simple deduction or replace, all should be considered as belonging to the present invention and determine scope of patent protection by claims of being submitted to.

Claims (5)

1. magnetic spring is characterized in that:
Described magnetic spring (E) comprises permanent moving magnet (5) and forever decides magnet (6).
2. the linear compressor with magnetic spring structure is characterized in that, comprising:
Magnetic spring (E), moving piston assembly (D), linear electric motor (C), compressor block (B) and outlet valve (A);
Described magnetic spring (E) comprises permanent moving magnet (5) and forever decides magnet (6);
Described moving piston assembly (D) comprises electric mover (3), piston (7) and permanent moving magnet (5);
Described linear electric motor (C) comprise electric motor internal stator (1), motor external stator (2), mover (3) and coil (4), and mover (3) combines as a whole with piston (7) and permanent moving magnet (5);
Described compressor block (B), fixedly linear electric motor inner stator (1), external stator (2) reach and forever decide magnet (6).
3. according to claim 2 linear compressor, it is characterized in that the permanent moving magnet (5) of described magnetic spring (E) is embedded on the piston assembly (D).
4. according to claim 2 linear compressor, it is characterized in that the magnet edge (6) of forever deciding of described magnetic spring (E) is embedded on the compressor block.
5. according to claim 2 linear compressor, it is characterized in that described moving piston assembly (D) is done linear reciprocating motion in the effect lower edge of motor alternation thrust electrical axis direction, thereby finish the air-breathing-compression-exhaust process of compressor.
CN 201010600482 2010-12-22 2010-12-22 Linear compressor with magnetic spring structure Pending CN102052420A (en)

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Application Number Priority Date Filing Date Title
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015021820A1 (en) * 2013-08-15 2015-02-19 华中科技大学 Zero-rigidity magnetic suspension active vibration isolator and six-degrees-of-freedom vibration isolation system comprised thereof
CN104455139A (en) * 2014-11-07 2015-03-25 浙江大学 Spring vibration isolating device and vibration isolating method based on self-adaption electromagnetic damping
CN105570367A (en) * 2016-01-12 2016-05-11 珠海格力节能环保制冷技术研究中心有限公司 Magnetic spring and linear motor and compressor with same
CN105756881A (en) * 2014-12-16 2016-07-13 天纳克（苏州）排放系统有限公司 Plunger pump with spacing structure and application thereof
CN106678012A (en) * 2017-02-16 2017-05-17 韩金山 Isolated type linear piston compressor
CN111463986A (en) * 2020-05-11 2020-07-28 浙江省东阳市东磁诚基电子有限公司 Long-life quick-response linear vibration motor and implementation method thereof

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999018649A1 (en) * 1997-10-04 1999-04-15 Z & D Limited Linear motor compressor
CN2440971Y (en) * 2000-06-07 2001-08-01 卢海龙 Magnetic spring
CN201255204Y (en) * 2008-09-02 2009-06-10 岳永恒 Magnetic spring
WO2009081295A2 (en) * 2007-12-19 2009-07-02 Koninklijke Philips Electronics, N.V. Magnetic spring system for use in a resonant motor
CN101737300A (en) * 2010-01-29 2010-06-16 浙江大学 Direct-drive compressor with permanent magnet stored energy buffering device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999018649A1 (en) * 1997-10-04 1999-04-15 Z & D Limited Linear motor compressor
CN2440971Y (en) * 2000-06-07 2001-08-01 卢海龙 Magnetic spring
WO2009081295A2 (en) * 2007-12-19 2009-07-02 Koninklijke Philips Electronics, N.V. Magnetic spring system for use in a resonant motor
CN201255204Y (en) * 2008-09-02 2009-06-10 岳永恒 Magnetic spring
CN101737300A (en) * 2010-01-29 2010-06-16 浙江大学 Direct-drive compressor with permanent magnet stored energy buffering device

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015021820A1 (en) * 2013-08-15 2015-02-19 华中科技大学 Zero-rigidity magnetic suspension active vibration isolator and six-degrees-of-freedom vibration isolation system comprised thereof
CN104455139A (en) * 2014-11-07 2015-03-25 浙江大学 Spring vibration isolating device and vibration isolating method based on self-adaption electromagnetic damping
CN105756881A (en) * 2014-12-16 2016-07-13 天纳克（苏州）排放系统有限公司 Plunger pump with spacing structure and application thereof
CN105756881B (en) * 2014-12-16 2018-11-06 天纳克（苏州）排放系统有限公司 Plunger pump with position limiting structure and its application
CN105570367A (en) * 2016-01-12 2016-05-11 珠海格力节能环保制冷技术研究中心有限公司 Magnetic spring and linear motor and compressor with same
CN106678012A (en) * 2017-02-16 2017-05-17 韩金山 Isolated type linear piston compressor
CN111463986A (en) * 2020-05-11 2020-07-28 浙江省东阳市东磁诚基电子有限公司 Long-life quick-response linear vibration motor and implementation method thereof

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Application publication date: 20110511