CN108870793A - A kind of sound energy free-piston type refrigeration machine - Google Patents
A kind of sound energy free-piston type refrigeration machine Download PDFInfo
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- CN108870793A CN108870793A CN201810869648.0A CN201810869648A CN108870793A CN 108870793 A CN108870793 A CN 108870793A CN 201810869648 A CN201810869648 A CN 201810869648A CN 108870793 A CN108870793 A CN 108870793A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/14—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the cycle used, e.g. Stirling cycle
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- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
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Abstract
The invention discloses a kind of sound energy free-piston type refrigeration machines, including being equipped with compression piston, the compression mechanism of compressed spring and linear motor, the expansion mechanism equipped with expansion piston, piston rod and expansion spring and shell supporting mechanism；The compression piston connect and drives with the compressed spring, the linear motor respectively；The piston rod passes through the compression piston and connection component is connect with the expansion piston and the expansion spring respectively；The connection component includes axial width or/and the adjustable weighted of radial thickness, and the weighted is made using the high density material that density is greater than metallic aluminium and metallic copper；Sound energy free-piston type refrigeration machine of the present invention controls intrinsic frequency by adjusting the quality of compressor mover, realizes the operation of the long-term efficient stable of refrigeration machine, has technology difficulty low, easy to maintain, the steady advantage of refrigerator operation.
Description
Technical field
The present invention is to be related to a kind of sound energy free-piston type refrigeration machine, belongs to technical field of refrigeration equipment.
Background technique
Sound energy refrigerating plant is a kind of back-heating type gas refrigeration unit, has an important feature to be in structure：In compressor
It does not use gas distribution valve, compression mechanism and expansion mechanism between structure and expansion mechanism to operate with identical high-frequency, refrigeration machine
The changing rule of system pressure is codetermined by the interaction of internal various parameters.
Sealing structure is divided into static seal and dynamic sealing according to the difference of its working condition and motion feature, wherein dynamic sealing
It is through common in the compressional zone and breathing space of sound energy refrigeration machine, dynamic sealing is largely divided into contact seal, contactless close
Two kinds of envelope, contact seal is due to needing to overcome abrasion that abrasion between higher extra power consumption and cylinder and piston is spent to generate pollution
It is heavier, be not suitable for the application for the sound energy refrigeration machine that figure is small and exquisite, structure is more accurate, therefore, clearance seal, which is more suitable for sound, to be made
The application of cold.
Clearance seal is in the practical application of sound energy refrigeration machine, on the one hand, due to sound energy refrigeration machine operating condition particularity, exists
The real-time change of the working environments element such as pressure and temperature, on the other hand, due to mover one end using flexure spring support and
There are inevitable rigging errors, there is bias so as to cause the hole axle of clearance seal, so that the technical effect of clearance seal,
Ideal value in theoretical research can not be reached, cause efficiency reduce, be prone to wear, reduced service life, as caused by bias
Friction increases power consumption, abrasion components, and hole between centers also generates pollution because of abrasion, in addition, the compressor of sound energy refrigeration machine
Mover quality difference causes intrinsic frequency to change, can be matching by adjusting the rigidity of corresponding support spring, free-piston
The flexible support spring of formula refrigeration machine application is mostly flat spring, for the design of its shape of rigidity needed for acquisition and calculates complexity, processing
Difficulty is high；With the passage for using the time, the elastic property of support spring declines therewith, and replacement cost is high, and eliminates meeting in advance
Cost is caused to waste, therefore, a kind of sound of quality control intrinsic frequency by adjusting compressor mover is thirsted for designing in this field
Energy free-piston type refrigeration machine, reduces technology difficulty, easy to maintain, realizes the operation of the long-term efficient stable of refrigeration machine.
Summary of the invention
In view of the above-mentioned problems existing in the prior art and demand, the object of the present invention is to provide a kind of sound energy free-piston types
Refrigeration machine controls intrinsic frequency by adjusting the quality of compressor mover, reduces technology difficulty, easy to maintain, realizes refrigeration
The operation of captain's phase efficient stable.
To achieve the above object, the technical solution adopted by the present invention is as follows：
A kind of sound energy free-piston type refrigeration machine, it is characterised in that：Machine is supported including compression mechanism, expansion mechanism and shell
Structure；The shell supporting mechanism is used to support the fixed compression mechanism and the expansion mechanism, and is formed and be used for the compression
The sealing cavity of mechanism and expansion mechanism operation, the compression mechanism includes compression piston, compressed spring and linear motor,
The compression piston passes through the connection component being equipped with respectively and connect and pass through described straight with the compressed spring, the linear motor
Line motor driven, the permanent magnet of the linear motor are fixed on the permanent magnetism body support frame connecting with the compression piston；It is described swollen
Swollen mechanism includes expansion piston, piston rod and expansion spring, and the piston rod passes through the axial central through hole of the compression piston
It is connect respectively with the expansion piston and the expansion spring with the axial center hole of the connection component and by both ends；It is described
Connection component includes axial width or/and the adjustable weighted of radial thickness, and the weighted is greater than metal using density
The high density material of aluminium and metallic copper is made, and the high density material includes copper, tungsten or its alloy；By adjusting weighted
Axial width or radial thickness change its weight in turn and are used to effectively adjust compressed side mover quality.
Preferably, the connection component further includes the connector one for being equipped with axial center hole and coaxial arrangement, connects
Several screws four of fitting two, fixing screws and circumference uniform distribution successively lead in the step axle construction that the connector one is equipped with
Cross axial center hole that the connector two and the permanent magnetism body support frame pass through and clamping, the connector two, permanent magnetism body support frame,
Compression piston is sequentially coaxially arranged and is fixedly connected by several screws four, and the fixing screws sequentially pass through the compression
The axial center hole of spring, the axial center hole of the connector one and the axial central through hole inner wall of the compression piston pass through
It is threadedly coupled, the connector one, connector two constitute the weighted, and the connector one, connector two use metal
Copper is made, and the density (8.9g/cm3) of copper is bigger than the density of aluminium (2.7g/cm3) and steel (7.85g/cm3), therefore passes through connector
The adjustment of two axial width of one radial thickness or connector changes its weight in turn and is used to effectively adjust compressed side mover quality
Meanwhile not influencing the running space of compression piston and compressed spring.
Preferably, the piston rod is step axle construction, the bigger diameter end of the piston rod and the expansion piston
Connection, the miner diameter end of the piston rod pass through the axial center hole of the compression piston axial central through hole and the fixing screws
It being connect with the expansion spring, the aperture of the compression piston axial central through hole is adapted with the bigger diameter end of the piston rod,
The aperture of the axial center hole of the fixing screws is adapted with the miner diameter end of the piston rod, by the way that the piston rod is arranged
The length of the length of path section or the/fixing screws is used to limit the lower dead center of the expansion piston.
As further preferred scheme, the axial central through hole of the compression piston and the piston rod major diameter section are gap
The outer diameter difference of sealing, the axial central through hole internal diameter of the compression piston and the piston rod major diameter section is 16~40 μm.
Preferably, the outer edge of the compressed spring and the expansion spring passes through the positioning cylinder interval being equipped with
Setting, the amplitude of the compression piston are defined as X1, and the amplitude of the expansion piston is defined as X2, then the axial direction of positioning cylinder is long
Degree is a (X1+X2), wherein a=0.7~0.9.
As further preferred scheme, the amplitude X1 of the compression piston is 8mm, and the amplitude X2 of the expansion piston is
5mm, the axial length of the positioning cylinder are 11.7mm.
As further preferred scheme, the outer edge and the positioning cylinder of the compressed spring and expansion spring pass through spiral shell
Nail one is fixedly connected with the tubular electric machine support one end being equipped with, and the other end of the electric machine support passes through the screw across outer yoke
Three are fixed on the shell supporting mechanism；The axial length of the electric machine support determines the compression chamber size of compression mechanism,
Axial length is longer, then compression chamber is bigger.
Preferably, the cross-sectional area of the piston rod is 0.125~0.25 times of compression piston cross-sectional area, institute
It is long-pending bigger to state cross section of the piston rod, the aerodynamic force that the expansion piston is subject to is bigger.
Preferably, the shell supporting mechanism includes lower bracket, and the lower bracket is equipped with the expansion mechanism
Expansion cylinder match to form cylinder part compatible with the compression piston and the expansion piston respectively；The compression is lived
The axial admission channel being provided on the top surface of plug is provided with and the axial admission channel on the side wall outer ring surface of the compression piston
The piston radial aperture of connection is equipped with cylinder radial hole corresponding with the piston radial aperture, institute on the lower bracket
Piston radial aperture is stated to be aligned with the cylinder radial hole at equilbrium position.
Preferably, corresponded on the lower bracket at the cylinder radial hole be equipped with groove, and with straight line
The airflow channel for being connected to compression chamber between the linear motor upper end and shell supporting mechanism, the piston diameter are formed after motor assembly
It is equipped with square groove to the excircle of aperture, the aperture φ range of the piston radial aperture and the cylinder radial hole is
The internal diameter of 0.1mm~0.5mm, the axial admission channel are 1mm~1.5mm, and the width W of the square groove is than the piston diameter
To the big 0.5mm~1.5mm of aperture φ of aperture, the length L of the square groove is 6mm~10mm, and the depth H of the square groove is
0.5mm~1mm.
Preferably, the compressed spring and the expansion spring respectively correspond on outer ring surface equipped with described in notch
Notch is matched with the power interface being equipped on the shell supporting mechanism, and sufficient space, side are reserved for power connector
Just cabling and wiring, and the notch on the outer ring surface of the compressed spring and the expansion spring, do not destroy the complete of molded line
Whole property, will not influence the mechanical performance of entire spring.
Preferably, the shell supporting mechanism further includes upper frame and lower bracket, the upper frame and it is described under
Two seals are equipped between bracket, it is therefore intended that back pressure cavity and compression chamber are sealed, avoid collaborating.
Compared with prior art, the present invention has the advantages that：
Sound energy free-piston type refrigeration machine of the present invention controls intrinsic frequency by adjusting the quality of compressor mover, real
The operation of the existing long-term efficient stable of refrigeration machine；Compressor passes through the balance hole slot being equipped with, so that compression piston reduces friction；Pass through
Precise spraying positioning cylinder reduces refrigeration machine to control the axial spacing between adjustment compressed spring and expansion spring as far as possible
While volume, operational reliability is also improved, is effectively adjusted by the connection component that the setting different quality being equipped with configures
Compressed side mover quality has technology difficulty low, and easy to maintain, the steady advantage of refrigerator operation has significant progress
With good application value.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of sound energy free-piston type refrigeration machine provided in an embodiment of the present invention；
Fig. 2 is that compression mechanism provided in an embodiment of the present invention flattens weighing apparatus schematic illustration；
Fig. 3 is the structural schematic diagram of compression piston provided in an embodiment of the present invention；
Fig. 4 is the enlarged drawing of A in Fig. 1；
Fig. 5 is the structural schematic diagram of lower bracket provided in an embodiment of the present invention；
Fig. 6 is the structural schematic diagram of the compressed spring provided in an embodiment of the present invention in lower casing；
Fig. 7 is clearance sealing structure schematic diagram provided in an embodiment of the present invention；
Fig. 8 is the structural schematic diagram of shell supporting mechanism provided in an embodiment of the present invention.
Figure label is schematically as follows：1, shell supporting mechanism；11, copper cold head；111, threaded hole；112, soldering opening one；12,
Thin-wall stainless steel set；121, soldering opening two；13, hot end heat conducting sleeve；131, soldering opening three；14, upper frame；15, lower case；151,
Power interface；152, soldering opening four；2, expansion mechanism；21, upper expansion piston；22, lower expansion piston；23, cool end heat exchanger；
24, regenerator；25, hot end heat exchanger；26, expansion cylinder；27, piston rod；28, expansion spring；3, compression piston；31, axial
Inlet channel；32, piston radial aperture；33, square groove；34, back pressure cavity；35, compression chamber；36, expansion chamber；37, axial centre
Through-hole；4, lower bracket；41, groove；42, cylinder radial hole；43, boss；44, baffle ring；45, sealing ring；46, cylinder part；5,
Compressed spring；51, notch；6, connection component；61, connector one；62, connector two；63, fixing screws；7, positioning cylinder；
81, screw one；82, screw two；83, screw three；84, screw four；85, screw five；86, screw six；9, linear motor；91, outer
Yoke；92, interior yoke；93, permanent magnetism body support frame；94, permanent magnet；95, coil；96, electric machine support.
Specific embodiment
Technical solution of the present invention is described in further detail below in conjunction with drawings and examples.
Embodiment
In conjunction with shown in Fig. 1 to Fig. 8, the present embodiment provides a kind of sound energy free-piston type refrigeration machine, including it is compression mechanism, swollen
Swollen mechanism 2 and shell supporting mechanism 1；The shell supporting mechanism 1 is used to support the fixed compression mechanism and the expanding machine
Structure 2, and the sealing cavity run for the compression mechanism and the expansion mechanism 2 is formed, the compression mechanism includes compression
Piston 3, compressed spring 5 and linear motor 9, the bottom surface of the compression piston pass through the connection component 6 being equipped with and the pressure respectively
Contracting spring 5, the linear motor 9 are connected and are driven by the linear motor 9；The expansion mechanism 2 includes expansion piston, work
Stopper rod 27 and expansion spring 28, the piston rod 27 pass through the axial central through hole 37 and the connection group of the compression piston 3
The axial center hole of part 6 is simultaneously connect with the expansion piston and the expansion spring 28 by both ends respectively；The connection component 6
Including axial width or/and the adjustable weighted of radial thickness, the weighted is greater than metallic aluminium and metal using density
The high density material of copper is made, and the high density material includes copper, tungsten or its alloy；By adjusting the axial width of weighted
Or radial thickness changes its weight in turn and is used to effectively adjust compressed side mover quality.
The shell supporting mechanism 1 includes successively being welded to connect to be formed to be used for the compression mechanism and the expansion mechanism 2
Copper cold head 11, thin-wall stainless steel set 12, hot end heat conducting sleeve 13, upper frame 14 and the lower case 15 of the sealing cavity of operation, at this
In embodiment, the copper cold head 11 is welded to connect at soldering opening 1 with thin-wall stainless steel set 12, and the thin-walled is stainless
Steel bushing 12 and the hot end heat conducting sleeve 13 are welded to connect at soldering opening 2 121, the hot end heat conducting sleeve 13 and the upper frame
14 are welded to connect at soldering opening 3 131, and the upper frame 14 is welded to connect at soldering opening 4 152 with the lower casing 15；
The copper cold head 11 is provided with 4 equally distributed threaded holes 111 on along the circumferential direction, convenient for closely connecting with each conduction cooling equipment
It connects, sound free-piston refrigeration machine is enable to be suitable for each occasion；The upper frame 14 is made of stainless steel, the copper cold head 11
With hot end heat conducting sleeve 13 using the higher red copper production of thermal coefficient, exports the cooling capacity of refrigeration machine hot end and cold end sufficiently, subtract
Small thermal conduction resistance；Thin-wall stainless steel set 12 with a thickness of 0.5~1mm, lesser cross-sectional area can effectively reduce axial direction
Conductive heat loss.
The shell supporting mechanism 1 further includes lower bracket 4, the expansion gas that the lower bracket 4 is equipped with the expansion mechanism 2
Cylinder 26, which matches to merge, to be connected through a screw thread to form cylinder part compatible with the compression piston 3 and the expansion piston respectively
46；Sealed connection is fixed by screw 5 85 and two seals 45 between the upper frame 14 and the lower bracket 4, Gu
Back pressure cavity 34 and compression chamber 35 are sealed while fixing bracket 4, avoid collaborating；The lower bracket 4 is made simultaneously using aluminum
One layer of wear-resistant material is coated in outer surface.
The linear motor 9 includes outer yoke 91, interior yoke 92, permanent magnetism body support frame 93, permanent magnet 94, coil 95 and motor
Bracket 96, the permanent magnet 94 be fixed on the permanent magnetism body support frame 93 and be located at the outer yoke 91 and the interior yoke 92 it
Between, the coil 95 is set in the outer yoke 91, and the interior yoke 92 is sleeved on the lower bracket 4, and one end resists institute
The boss 43 that lower bracket 4 is equipped with is stated, the other end is fixed by baffle ring 44, the baffle ring 44 and 4 glue of lower bracket
It is connected；
The expansion mechanism 2 further includes cool end heat exchanger 23, the regenerator 24, heat for being sleeved on 26 outside of expansion cylinder
Heat exchanger 25 is held, the expansion piston the close-connected upper expansion piston 21 of screw thread with lower expansion piston 22 by being made up of, institute
It states piston rod 27 and is connect with the lower expansion piston 22 by screw 6 86；The expansion cylinder 26 and the upper expansion piston 21
Using thermal coefficient lower engineering plastics production, such as PPO, MPPO, nylon 6, nylon66 fiber, nylon 1010, PEEK or other are multiple
Condensation material, it is therefore intended that reduce the axial heat conduction loss of expansion cylinder 26, expansion piston two sides, the lower expansion piston 22 uses
Aluminum is made and outside is covered with one layer of wear-resistant material.
In the present embodiment, the connection component 6 further include equipped with axial center hole and be coaxially disposed connector 1,
Several screws 4 84 of connector 2 62, fixing screws 63 and circumference uniform distribution, the Step Shaft knot that the connector 1 is equipped with
The axial center hole of the connector 2 62 and the permanent magnetism body support frame 93 and clamping, the connector two are passed sequentially through on structure
62, permanent magnetism body support frame 93, compression piston 3 are sequentially coaxially arranged and are fixedly connected by several screws 4 84, the fixation
Screw 63 sequentially pass through the axial central through hole 37 of the compressed spring 5, the connector 1 axial center hole with it is described
37 inner wall of axial central through hole of compression piston 3 is connected through a screw thread, and is matched described in the connector 1, the composition of connector 2 62
Part is reconstructed, the connector 1, connector 2 62 are made using metallic copper, and the density (8.9g/cm3) of copper is than aluminium (2.7g/
Cm3) and the density of steel (7.85g/cm3) is big, therefore axial thick by connector one (61) radial thickness or connector two (62)
The adjustment of degree changes its weight in turn and is used to effectively adjust compressed side mover quality, and does not influence compression piston and compressed spring 5
Running space.
In the present embodiment, the piston rod 27 is step axle construction, the bigger diameter end of the piston rod 27 and the expansion
Piston connection, the miner diameter end of the piston rod 27 pass through the axis of the compression piston axial central through hole 37 and the fixing screws
It is connect to centre bore with the expansion spring 28, the aperture of the compression piston axial central through hole 37 and the piston rod 27
Bigger diameter end is adapted, and the aperture of the axial center hole of the fixing screws 63 is adapted with the miner diameter end of the piston rod 27, is led to
The length for the path section that the piston rod 27 is set or the length of/fixing screws 63 are crossed for limiting the expansion piston
Lower dead center.
In the present embodiment, the axial central through hole 37 of the compression piston 3 and the 27 major diameter section of piston rod are (in such as figure
At the L1 of mark) it is clearance seal, 37 internal diameter of axial central through hole of the compression piston 3 and the 27 major diameter section of piston rod
Outer diameter difference is 16 μm~40 μm.
In the present embodiment, the compressed spring 5 and the outer edge of the expansion spring 28 pass through the positioning cylinder 7 being equipped with
Interval setting, it is contemplated that the displacement phase difference of compression piston 3 and expansion piston is 70 °~100 °, the amplitude of the compression piston 3
It is defined as X1, the amplitude of the expansion piston is defined as X2, then the axial length of positioning cylinder is a (X1+X2), wherein a=
0.7~0.9, the axial length of the positioning cylinder 7 is too short to will cause compressed spring 5 and the interference of expansion spring 28, and length is too long
The axial length that complete machine can excessively be increased, increases machine volume.
In the present embodiment, the amplitude X1 of the compression piston 3 is 8mm, and the amplitude X2 of the expansion piston is 5mm, institute
The axial length L for stating positioning cylinder 7 is 11.7mm.
In the present embodiment, the outer edge of the compressed spring 5 and expansion spring 28 and the electric machine support 96 being equipped with
Lower end surface has 4 threaded holes to match, and 4 screws 1 sequentially pass through the compressed spring 5, the positioning respectively
Cylinder 7, the expansion spring 28 are fixedly connected with 96 one end of tubular electric machine support, and the other end of the electric machine support 96 is by outer yoke
Iron 91 is compacted to upper frame 14, and is fixed on the upper frame 14 by 4 screws 3 83；The axial length of electric machine support 96
Determine 35 size of compression chamber of the compression mechanism, axial length is longer, and compression chamber 35 is bigger.
In the present embodiment, the cross-sectional area of the piston rod 27 is the 0.125~0.25 of 3 cross-sectional area of compression piston
Times, 27 cross-sectional area of piston rod is bigger, and the aerodynamic force that the expansion piston is subject to is bigger.
In the present embodiment, as Figure 2-Figure 5, the axial admission channel 31 being provided on the top surface of the compression piston 3,
The piston radial aperture 32 being connected to the axial admission channel 31 is provided on the side wall outer ring surface of the compression piston 3, in institute
Lower bracket 4 is stated equipped with cylinder radial hole 42 corresponding with the piston radial aperture 32, the piston radial aperture 32 with
The cylinder radial hole 42 is aligned at equilbrium position, plays the role of balancing 3 pressure at two ends of compression piston；Work as compression piston
When 3 deviation equilbrium position, piston radial aperture 32 is staggered with cylinder radial hole 42, guarantees the compression chamber 35 and back of compression mechanism
Pressure chamber 34 is not collaborated.
In the present embodiment, corresponded on the lower bracket 4 at the cylinder radial hole 42 be equipped with groove 41, and with
Linear motor 9 forms after assembling and is connected to compression chamber 35 between 9 upper end of linear motor and the upper frame 14, the lower bracket 4
Airflow channel, the excircle of the piston radial aperture 32 is equipped with square groove 33, the piston radial aperture 32 and the gas
The aperture φ range of cylinder radial hole 42 is 0.1mm~0.5mm, and the internal diameter in the axial admission channel 31 is 1mm~1.5mm,
The width W of the square groove 33 is 0.5mm~1.5mm bigger than the aperture φ of the piston radial aperture 32, the square groove 33
Length L is 6mm~10mm, and the depth H of the square groove 33 is 0.5mm~1mm；When compression piston 3 moves to equilbrium position,
Piston radial aperture 32 is connected to cylinder radial hole 42, and the gas in compression chamber 35 successively passes through axial admission channel 31, lives
Radial hole 32, square groove 33 are filled in, interior yoke 92 is flowed into lower bracket groove 41 and is formed by annular space space, finally flow into back pressure
Chamber 34, compression chamber 35 is identical as 34 air pressure of back pressure cavity at this time, 3 two sides pressure balance of compression piston.By the setting of square groove 33,
Even if in piston radial aperture 32 with cylinder radial hole 42 because the reasons such as assembly precision are not perfectly aligned in a circumferential direction
In the case where, since the length of square groove is all larger than 32 outer diameter of piston radial aperture with wide, so still can be with back pressure in compression chamber 35
Chamber 34 communicates；In addition, to be equipped with the airflow channel path to be formed with groove 41 shorter for cylinder radial hole 42, it is easy to process and
Assembly.
In the present embodiment, as shown in fig. 6, the compressed spring 5 and the expansion spring 28 are right respectively on outer ring surface
It should be equipped with notch 51, the notch notch 51 is matched with the power interface 151 being equipped on the lower casing 15, connect for power supply
Plug-in unit reserves sufficient space, facilitates cabling and wiring, and in the outer ring surface of the compressed spring 5 and the expansion spring 28
Upper notch does not destroy the integrality of molded line, will not influence the mechanical performance of entire spring.
The course of work of sound energy free-piston type refrigeration machine is described below：
Sound energy free-piston type refrigeration machine is driven by linear motor 9, when the coil 95 to linear motor 9 leads to unidirectional alternation electricity
Axial alternating magnetic field is formed when stream, in coil 95, permanent magnet 94 just receives the driving force of axial alternation, so that compression be driven to live
Plug 3 does axial linear reciprocating motion, and compressed spring 5 provides radial support and axial elasticity power to compression piston 3, guarantees its tool
There is ideal amplitude；The pressure oscillation of back pressure cavity 34 is smaller, essentially the blowing pressure；Ignore hot end heat exchanger 25, regenerator 26,
The pressure drop of cool end heat exchanger 23, then it is believed that compression chamber 35 is identical as the pressure of expansion chamber 36, compression chamber 35 and expansion chamber 36
Pressure is essentially sinusoidal fluctuation；Piston rod 27 passes through compression piston 3, since piston rod 27 occupies lower 22 lower end surface of expansion piston
Certain forced area, and the lower end surface of piston rod 27 is placed in the back pressure cavity 34 that pressure is basically unchanged, so on expansion piston
Lower both ends form pressure difference, this pressure difference is the aerodynamic force of expansion piston；Working medium gas changes after the compression of compression chamber 35 by hot end
The heat that compression process generates is released to environment by hot device 25, and then gas flows into annular regenerator 24 and rejects heat to backheat
Device filler, Working medium gas temperature, pressure declines at this time, and subsequently into 36 swell refrigeration of expansion chamber, expansion piston is transported downwards at this time
It is dynamic, cooling capacity is exported using cool end heat exchanger 23；Gas after the completion of expansion flows back to the heat of 24 dry load of regenerator, at this time
The temperature, pressure of Working medium gas rises, and finally flows back to compression chamber 35 and continues to participate in refrigeration cycle by compression.
Sound energy free-piston type refrigeration machine is higher to the required precision of processing and manufacturing, required when now fabricating to its part
The precision and tolerance of satisfaction are described：
As shown in fig. 7, be clearance seal (at the L3 marked in such as Fig. 7) between lower expansion piston 22 and cylinder part 46, under
22 outer diameter of expansion piston and 46 internal diameter difference of cylinder part are 16~40 μm, upper 21 outer diameter of expansion piston and 46 internal diameter difference of cylinder part
It is 200~400 μm, this section is not clearance seal so lower to requirement on machining accuracy；It is between compression piston 3 and cylinder part 46
Clearance seal (at the L2 marked in such as figure), 3 outer diameter of compression piston and 46 internal diameter difference of cylinder part are 16~40 μm；Lower expansion is lived
Plug 22 and 3 outer cylinder surface of compression piston need to guarantee cylindricity 0.01；46 inner cylinder face of cylinder part need to guarantee cylindricity 0.01；Under
Expansion piston 22 and compression piston 3 and cylinder part 46 will guarantee concentricity φ 0.01；The axial central through hole 37 of compression piston 3 with
The corresponding external cylindrical surface of 27 major diameter section of piston rod need to guarantee cylindricity 0.01, while also need to guarantee that the two concentricity is φ 0.01.
It is visible in summary：Sound energy free-piston type refrigeration machine of the present invention by adjusting compressor mover quality control
Intrinsic frequency processed realizes the operation of the long-term efficient stable of refrigeration machine；Compressor passes through the balance hole slot being equipped with, so that compression piston
Reduce friction；By Precise spraying positioning cylinder 7, to control the axial spacing between adjustment compressed spring 5 and expansion spring 28,
While reducing volume as far as possible, operational reliability is also improved, the connection component configured by the setting different quality being equipped with
Compressed side mover quality is effectively adjusted, has technology difficulty low, easy to maintain, the steady advantage of refrigerator operation.
It is last it is necessarily pointed out that：The foregoing is merely the preferable specific embodiment of the present invention, but the present invention
Protection scope be not limited thereto, anyone skilled in the art in the technical scope disclosed by the present invention,
Any changes or substitutions that can be easily thought of, should be covered by the protection scope of the present invention.
Claims (10)
1. a kind of sound energy free-piston type refrigeration machine, it is characterised in that：Machine is supported including compression mechanism, expansion mechanism and shell
Structure；The shell supporting mechanism is used to support the fixed compression mechanism and the expansion mechanism, and is formed and be used for the compression
The sealing cavity of mechanism and expansion mechanism operation, the compression mechanism includes compression piston, compressed spring and linear motor,
The compression piston passes through the connection component being equipped with respectively and connect and pass through described straight with the compressed spring, the linear motor
Line motor driven, the permanent magnet of the linear motor are fixed on the permanent magnetism body support frame connecting with the compression piston；It is described swollen
Swollen mechanism includes expansion piston, piston rod and expansion spring, and the piston rod passes through the axial central through hole of the compression piston
It is connect respectively with the expansion piston and the expansion spring with the axial center hole of the connection component and by both ends；It is described
Connection component includes axial width or/and the adjustable weighted of radial thickness, and the weighted is greater than metal using density
The high density material of aluminium and metallic copper is made.
2. sound energy free-piston type refrigeration machine according to claim 1, it is characterised in that：The connection component further includes setting
Have axial center hole and be coaxially disposed connector one, connector two, fixing screws and circumference uniform distribution several screws four, institute
It states and is passed sequentially through in the step axle construction that connector one is equipped in the axial direction that the connector two and the permanent magnetism body support frame pass through
Heart hole and clamping, the connector two, permanent magnetism body support frame, compression piston are sequentially coaxially arranged and are consolidated by several screws four
Fixed connection, the fixing screws sequentially pass through the axial center hole of the axial center hole of the compressed spring, the connector one
It is connected through a screw thread with the axial central through hole inner wall of the compression piston, the connector one, connector two constitute described match
Reconstruct part.
3. sound energy free-piston type refrigeration machine according to claim 2, it is characterised in that：The piston rod is Step Shaft knot
Structure, the bigger diameter end of the piston rod are connect with the expansion piston, and the miner diameter end of the piston rod passes through the compression piston axis
It is connect to central through hole and the axial center hole of the fixing screws with the expansion spring, the compression piston axial centre is logical
The aperture in hole is adapted with the bigger diameter end of the piston rod, the aperture of the axial center hole of the fixing screws and the piston rod
Miner diameter end be adapted, by the way that the length of the path section of the piston rod or the length of/fixing screws is arranged for limiting
The lower dead center of the expansion piston.
4. sound energy free-piston type refrigeration machine according to claim 3, it is characterised in that：In the axial direction of the compression piston
Heart through-hole and the piston rod major diameter section are clearance seal, the axial central through hole internal diameter and the piston rod of the compression piston
The outer diameter difference of major diameter section is 16~40 μm.
5. sound energy free-piston type refrigeration machine according to claim 1, it is characterised in that：The compressed spring with it is described swollen
The outer edge of swollen spring passes through the positioning cylinder interval setting being equipped with, and the amplitude of the compression piston is defined as X1, the expansion
The amplitude of piston is defined as X2, then the axial length of positioning cylinder is a (X1+X2), wherein a=0.7~0.9.
6. sound energy free-piston type refrigeration machine according to claim 5, it is characterised in that：The amplitude X1 of the compression piston
It is 5mm for 8mm, the amplitude X2 of the expansion piston, the axial length of the positioning cylinder is 11.7mm.
7. sound energy free-piston type refrigeration machine according to claim 5, it is characterised in that：The compressed spring and expansion bullet
The outer edge of spring and the positioning cylinder are fixedly connected by screw one with the tubular electric machine support one end being equipped with, the motor branch
The other end of frame is fixed on the shell supporting mechanism by passing through the screw three of outer yoke.
8. sound energy free-piston type refrigeration machine according to claim 1, it is characterised in that：The shell supporting mechanism includes
Lower bracket, the lower bracket matched with the expansion cylinder that the expansion mechanism is equipped with to be formed respectively with the compression piston and institute
State the compatible cylinder part of expansion piston；The axial admission channel being provided on the top surface of the compression piston, the compression piston
Side wall outer ring surface on be provided with the piston radial aperture being connected to the axial admission channel, on the lower bracket be equipped with and institute
The corresponding cylinder radial hole of piston radial aperture is stated, the piston radial aperture and the cylinder radial hole are in equilbrium position
When be aligned.
9. sound energy free-piston type refrigeration machine according to claim 8, it is characterised in that：Institute is corresponded on the lower bracket
It states and is equipped with groove at cylinder radial hole, and formed after being assembled with linear motor and be connected to the linear motor upper end and shell branch
The excircle of the airflow channel of compression chamber between support mechanism, the piston radial aperture is equipped with square groove, the piston radial aperture
Be 0.1mm~0.5mm with the aperture φ range of the cylinder radial hole, the internal diameter in the axial admission channel be 1mm~
The width of 1.5mm, the square groove are 0.5mm~1.5mm bigger than the aperture φ of the piston radial aperture, the length of the square groove
Degree is 6mm~10mm, and the depth of the square groove is 0.5mm~1mm.
10. sound energy free-piston type refrigeration machine according to claim 1, it is characterised in that：The compressed spring with it is described
Expansion spring respectively corresponds on outer ring surface to be connect equipped with notch described in notch and the power supply being equipped on the shell supporting mechanism
Mouth matches.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810869648.0A CN108870793A (en) | 2018-08-02 | 2018-08-02 | A kind of sound energy free-piston type refrigeration machine |
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| CN201810869648.0A CN108870793A (en) | 2018-08-02 | 2018-08-02 | A kind of sound energy free-piston type refrigeration machine |
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| CN201810869648.0A Withdrawn CN108870793A (en) | 2018-08-02 | 2018-08-02 | A kind of sound energy free-piston type refrigeration machine |
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| CN111023612A (en) * | 2019-11-18 | 2020-04-17 | 上海厚酷科技有限公司 | Refrigerator body assembly mounting structure |
| CN111076441A (en) * | 2019-11-18 | 2020-04-28 | 上海厚酷科技有限公司 | Refrigerator body |
| CN111089435A (en) * | 2019-11-18 | 2020-05-01 | 上海厚酷科技有限公司 | Refrigerating machine |
| CN111140654A (en) * | 2019-11-18 | 2020-05-12 | 上海厚酷科技有限公司 | Gas distribution piston of refrigerator |
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