CN111089435A

CN111089435A - Refrigerating machine

Info

Publication number: CN111089435A
Application number: CN201911129496.1A
Authority: CN
Inventors: 不公告发明人
Original assignee: Shanghai Houku Technology Co Ltd
Current assignee: Shanghai Houku Technology Co Ltd
Priority date: 2019-11-18
Filing date: 2019-11-18
Publication date: 2020-05-01

Abstract

The invention discloses a refrigerator, which comprises a pressure shell, a machine body, a linear motor, a gas distribution piston and a power piston, wherein the linear motor comprises an outer stator, a magnet tank and an inner stator, the machine body and the outer stator are fixedly arranged on the pressure shell, the inner stator is arranged on the machine body, the magnet tank is arranged on the power piston to enable the magnet tank to be in clearance fit with the outer stator and the inner stator, the power piston is arranged in the machine body, the gas distribution piston is partially positioned in the power piston and is coaxial with the power piston, an expansion cavity is formed between the pressure shell and the gas distribution piston, and a compression cavity is formed between the gas distribution piston and the power piston.

Description

Refrigerating machine

Technical Field

The invention relates to a refrigeration technology, in particular to a refrigerator.

Background

The working gas in the stirling cycle refrigerator is easily leaked helium or hydrogen enclosed at high pressure. The working medium (hydrogen or helium) in the cylinder is cooled by a cycle of cooling, compressing, absorbing heat and expanding.

However, the existing refrigerating machine has complex structure, large volume and heavy weight, and cannot be miniaturized so as to be conveniently applied to some occasions.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide a small-sized refrigerator with simple structure, small volume and light weight.

A refrigerator comprises a pressure shell, a machine body, a linear motor, a gas distribution piston and a power piston, wherein the linear motor comprises an outer stator, a magnet tank and an inner stator, the machine body and the outer stator are fixedly arranged on the pressure shell, the inner stator is arranged on the machine body, the magnet tank is arranged on the power piston to enable the magnet tank to be in clearance fit with the outer stator and the inner stator, the power piston is arranged in the machine body, the gas distribution piston is partially positioned in the power piston and coaxial with the power piston, an expansion cavity is formed between the pressure shell and the gas distribution piston, and a compression cavity is formed between the gas distribution piston and the power piston.

Further, the magnet jar includes clamping ring, magnet steel and base, the clamping ring reaches the base is fixed in the magnet steel both ends.

Furthermore, the base is provided with air holes, so that gas working media in the magnet tank flow smoothly, and the resistance of the magnet tank to reciprocating motion is reduced.

Furthermore, the refrigerator still includes heat transfer system, heat transfer system includes the regenerator subassembly, the regenerator subassembly cover is located distribution piston tip, the regenerator subassembly includes sleeve, filter pulp and film, the film twine in the sleeve, filter pulp is located the exit position at regenerator subassembly both ends can filter, spacing, even air current, the film is equipped with a plurality of archs, and each arch is equipped with the opening, the film twine in the sleeve forms a plurality of layers, and the air current passes through the opening flows between different layers, constitutes complicated gas circulation route to disturb the working medium and flow.

Further, the cross section of the bulge is splayed.

Further, the film is made of polyethylene naphthalate.

The gas distribution piston comprises a piston main body, a gas bearing and a porous body, wherein the piston main body is of a hollow structure, the piston main body is provided with a communicating hole and a recess, the recess is positioned on the outer surface of the piston main body, the communicating hole penetrates through the piston main body, two ends of the communicating hole are respectively communicated with the interior of the piston main body and the recess, the gas bearing presses the porous body on the inner surface of the piston main body, and a gas working medium in the piston main body flows out of the communicating hole and the recess through the gas bearing and the porous body under the action of gas pressure, so that a gas film gap is formed between the piston main body and the machine body to form sealing.

Further, the outer surface of the piston main body is plated with engineering plastics.

Further, the engineering plastic is polytetrafluoroethylene.

Further, the porous body is made of ultra-high molecular weight polyethylene, and the porosity is 30% -40%.

Compared with the prior art, the refrigerator has the advantages that the refrigerator body and the outer stator are fixedly arranged on the pressure shell, the inner stator is arranged on the refrigerator body, the magnet tank is arranged on the power piston to enable the magnet tank to be in clearance fit with the outer stator and the inner stator, the power piston is arranged in the refrigerator body, the gas distribution piston is partially positioned in the power piston and is coaxial with the power piston, the expansion cavity is formed between the pressure shell and the gas distribution piston, and the compression cavity is formed between the gas distribution piston and the power piston.

Drawings

FIG. 1 is a cross-sectional view of a refrigerator according to the present invention;

FIG. 2 is a cross-sectional view of a linear motor of the chiller of FIG. 1;

fig. 3 is a perspective view of an outer stator of the linear motor of fig. 2;

FIG. 4 is a cross-sectional view of the outer stator of FIG. 3;

FIG. 5 is a cross-sectional view of a magnet pot of the linear motor of FIG. 2;

fig. 6 is a schematic structural view of a vibration absorber of the refrigerator of fig. 1;

figure 7 is a top view of the vibration absorber of figure 6;

figure 8 is a top view of the leaf spring of the vibration absorber of figure 6;

FIG. 9 is a top view of the counterweight of the vibration absorber of FIG. 6;

fig. 10 is a schematic view of the internal structure of the refrigerator of fig. 1;

fig. 11 is an enlarged view of the refrigerator a of fig. 10;

FIG. 12 is a schematic diagram of the heat exchange system of the refrigerator of FIG. 1;

fig. 13 is a perspective view of the regenerator assembly of fig. 12;

fig. 14 is a schematic view of the raised structure of the membrane of the regenerator assembly of fig. 13.

In the figure: 10. a pressure housing; 20. a body; 30. a linear motor; 31. an outer stator; 310. an outer core; 3101. a notch; 3102. a housing part; 3103. an inner bore; 312. a coil; 32. a magnet pot; 320. pressing a ring; 321. magnetic steel; 322. a base; 3220. a through hole; 3221. air holes; 33. an inner stator; 40. a vibration absorber; 41. a plate spring; 410. a spiral arm; 412. mounting holes; 42. a mass block; 43. a balancing weight; 430. a fixing hole; 431. an edge; 44. a connecting sleeve; 45. a gasket; 46. a fastener; 460. a screw; 461. a nut; 47. a gasket; 50. a gas distribution piston; 51. a piston body; 510. a communicating hole; 512. a pocket; 52. a gas bearing; 53. a porous body; 54. a gas film gap; 60. a power piston; 70. a compression chamber; 80. an expansion chamber; 90. a heat exchange system; 91. a heat sink assembly; 92. a regenerator assembly; 921. filtering cotton; 922. a sleeve; 923. a film; 9230. a protrusion; 9231. an opening; 9232. a flow-through hole; 93. a heat sink assembly; 931. an inner heat sink assembly; 932. an outer radiator assembly.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that when referred to as being "secured to" another, it can be directly on the other or there can be another intermediate, secured through the intermediate. When one is considered to be "connected" to another, it can be directly connected to the other or there may be another intermediate at the same time. When one is said to be "disposed on" another, it may be disposed directly on the other or there may be another intervening component present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 to 14, a refrigerator according to the present invention includes a pressure housing 10, a body 20, a linear motor 30, a vibration absorber 40, a distribution piston 50, a power piston 60, and a heat exchange system 90. The body 20 is fixedly installed on the pressure shell 10, the linear motor 30 is installed on the pressure shell 10 and the body 20, and the magnet pot 32 is connected with the power piston 60. The power piston 60 is mounted within the body 20 and the displacer piston 50 is partially located within the power piston 60 and is coaxial with the power piston 60. An expansion chamber 80 is formed between the pressure housing 10 and the displacer 50 and a compression chamber 70 is formed between the displacer 50 and the power piston 60.

The linear motor 30 includes an outer stator 31, a magnet pot 32, and an inner stator 33.

The outer stator 31 includes two outer cores 310 and coils 312. The outer core 310 is made of a soft magnetic material. The outer core 310 has a notch 3101, a receiving portion 3102, and an inner hole 3103. The outer cores 310 are vertically engaged with each other, and the receiving portions 3102 form a space for mounting the coil 312. The coil 312 is a square copper wire formed by winding through a tool and is shaped by matching with glue and an insulating adhesive tape. Each outer core 310 is provided with four notches 3101 for fasteners attached to the body and for mounting the coils 312. During assembly, the insulating glue is used to fill the gap between the coil 312 and the outer core 310, ensuring that the coil 312 does not loosen during operating vibrations. The inner hole 3103 serves as an assembly reference.

The magnet pot 32 includes a pressing ring 320, a magnet 321, and a base 322. Magnetic steel 321 is fixed with press ring 320 and base 322 by glue. The inner and outer circular surfaces of the magnetic steel 321 form electromagnetic air gaps with the inner stator 33 and the outer stator 31, respectively. The gap between the magnet pot 32 and the outer stator 31 is single side 0.4mm-0.7 mm. The gap between the magnet pot 32 and the inner stator 33 is single side 0.5mm-0.8 mm. The base 322 is provided with a through hole 3220 and an air hole 3221. The base 322 is hollow cylindrical. The through hole 3220 is located at the center of the circle, and the air holes 3221 uniformly surround the through hole 3220. The air holes 3221 enable the gas working medium in the magnet pot 32 to flow smoothly, and reduce the resistance of the magnet pot 32 to the reciprocating motion.

The vibration absorber 40 includes two plate springs 41, a mass 42, a weight 43, a connecting sleeve 44, a spacer 45, a fastener 46, and a washer 47.

Each leaf spring 41 is provided with four spiral arms 410 and four mounting holes 412. The four spiral arms 410 are circumferentially distributed. The inner and outer curves of each spiral arm 410 are involutes. The inner curve and the outer curve both comprise two involutes, and the two involutes are in smooth transition. The spiral arm 410 adopts circular arc transition between the inner and outer curves. The radius of the circular arc is 1.5 mm. Each mounting hole 412 is 8.2mm in diameter. The centers of the four mounting holes 412 are located on a circle with a diameter of 95.4 mm. An included angle between a connecting line of the circle center of each mounting hole 412 and the circle center of the plate spring 41 and a connecting line of the circle centers of the circular arcs of the adjacent spiral arms 410 and the circle center of the plate spring 41 is 14 degrees. The whole plate spring 41 is circular, with a diameter of 108mm and a thickness of 2.1 mm. The circle center of the plate spring 41 is provided with a hole with the diameter of 10.2 mm.

The mass block 42 is circular ring-shaped, with an outer diameter of 108mm and a thickness of 5.9 mm.

The weight 43 is circular and has a fixing hole 430. Each fixing hole 430 has a diameter of 8.2 mm. The angle between the edge 431 of the weight 43 and the line from the fixing hole 430 to the center of the weight 43 is 10 °. The weight 43 has an inner diameter of 41mm and an outer diameter of 54 mm.

The fastener 46 includes a screw 460 and a nut 461.

When assembling the vibration absorber 40, one plate spring 41, the spacer 45 and the other plate spring 41 are sequentially mounted on the connecting sleeve 44, the mass block 42 and the weight block 43 are located above the plate spring 41, and the screws 460 are fixed to the nuts 461 through the mounting holes 412 of the plate spring 41, the through holes of the mass block 42 and the fixing holes 430 of the weight block 43, so that the mass block 42 and the weight block 43 are fixed to the plate spring 41.

When the vibration absorber 40 is used, the vibration absorber 40 absorbs the vibration at the operating frequency of the refrigerator since the weight 43 makes the natural frequency of the vibration absorber 40 equal to the natural frequency of the refrigerator body 20.

The displacer 50 includes a piston body 51, a gas bearing 52, and a porous body 53.

The piston main body 51 has a hollow structure, and is provided with a communication hole 510 and a pocket 512. The recess 512 is formed on the outer surface of the piston main body 51, and the communication hole 510 is a through hole having one end communicating with the inside of the piston main body 51 and the other end communicating with the recess 512. The outer surface of the piston main body 51 is plated with engineering plastics. In this embodiment, the engineering plastic is polytetrafluoroethylene. The thickness of the plating layer is 35-45 um.

The gas bearing 52 is a double row 8-orifice bearing. The porous body 53 is made of ultra-high molecular weight polyethylene, and has a porosity of 30 to 40% and a thickness of 0.35 to 0.75 mm. The porous body 53 is in interference fit with the inner wall of the piston main body 51, and the gas bearing 52 is in interference fit with the porous body 53 to press the porous body 53 against the inner wall of the piston main body 51. The piston body 51 is accommodated in the body 20 and is in clearance fit with the body 20.

The gas working medium in the piston main body 51 is in a high pressure state, flows through the gas bearing 52 and the porous body 53, flows through the communication hole 510 and the recess 512, enters the gap between the body 20 and the piston main body 51, forms the air film gap 54, and provides radial rigidity for the piston.

Through the design, under the condition of low air consumption, enough radial rigidity of the gas bearing is provided, and the sealing performance and the lubricating performance are ensured.

Heat exchange system 90 includes a heat sink assembly 91, a regenerator assembly 92, and a heat sink assembly 93.

The heat sink assembly 91 includes a heat sink and a bushing. The heat absorber is formed by red copper strip through the rolling machine suppression, and coefficient of heat conductivity is high, and heat transfer area is big, and helium gas working medium takes place to force convection heat transfer with the copper strips when passing through slit space and absorbs or release the heat, and the heat absorber is bigger than the convection heat transfer area on pressure shell 10 plain noodles, and heat exchange efficiency is higher. The bushing is made of stainless steel. The bush is located the heat absorber inner circle, avoids red copper fin to tighten up the back and directly exert external force to plastic sleeve 922 outer wall, leads to regenerator assembly 92's sleeve 922 upper end to warp, influences the reciprocating motion of distribution piston.

Regenerator assembly 92 includes filter wool 921, sleeve 922, and membrane 923. The film 923 is made of polyethylene naphthalate. The sleeve 922 is injection molded from an engineering plastic, the inner wall of which forms the expansion chamber 80 with the displacer. The film 923 is wrapped around the surface of the sleeve 922. The film 923 is provided with a plurality of bulges 9230, each bulge 9230 is provided with an opening 9231 and a circulation hole 9232, the opening 9231 is communicated with the circulation hole 9232, and the diameter of the opening 9231 is smaller than that of the circulation hole 9232. The cross-section of the projection 9230 is splayed. The film 923 is wound on the sleeve 922 to form a plurality of layers, and airflow flows among different layers through the opening 9231 to form a complex airflow path, so that the flow is disturbed, and the heat exchange efficiency is obviously improved. The thickness of the film 923 is 0.05 mm. The height of projection 9230 is 0.13 mm. The opening 9231 is circular and has a diameter of 0.18 mm. The flow holes 9232 are circular and have a diameter of 0.34 mm. The filter cotton 921 is located at the upper and lower inlet and outlet positions of the regenerator assembly 92 at the two ends of the sleeve 922, and plays a role in filtering, limiting and homogenizing the air flow.

The heat sink assembly 93 includes an inner heat sink assembly 931 and an outer heat sink assembly 932. The inner heat sink assembly 931 comprises a plurality of fins, the fins having a width of 5.5 mm. The outer radiator assembly 932 includes outer radiator fins and a clip. The width of the outer radiator fin is 25.5 mm. The outer radiator fins are cured and bonded to the outer wall of the pressure shell 10 by thermally conductive silicone grease. The clamp hoops and forms a plurality of external radiator fins. In this embodiment, the clamp is an iron wire.

When the refrigerator heat exchange system 90 is used, the heat absorber assembly 91 guides the heat in the expansion cavity 80 into the inner wall of the heat absorber assembly 91 through the copper cold head of the pressure shell 10, the working medium absorbs the heat through forced convection heat exchange when passing through the slit of the heat absorber 21, the temperature of the working medium rises, and the purpose of heating the working medium is achieved. The temperature in the expansion chamber 80 is reduced to achieve the purpose of refrigeration. Regenerator assembly 92 alternately absorbs heat from and provides heat to the working fluid. The inner radiator module 931 absorbs heat of the working medium, conducts the heat to the outer radiator module 932 through the pressure housing 10, and is forced to convectively discharge to the outside of the refrigerator by the external radiator fan.

Through the above design, the heat exchange system 90 is located in the cylinder, reducing the weight of the expansion piston, and having high heat exchange efficiency.

When the refrigerating device is used, the magnet tank 32 of the linear motor 30 drives the power piston 60 and the gas distribution piston 50 to reciprocate, and displacement difference exists between the power piston 60 and the gas distribution piston 50, so that working media are compressed in the compression cavity 70, and the expansion cavity 80 expands, and the refrigerating effect is achieved.

Various other modifications and changes may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes should fall within the scope of the claims of the present invention.

Claims

1. The utility model provides a refrigerator, includes pressure shell and fuselage, its characterized in that: the refrigerator also comprises a linear motor, a gas distribution piston and a power piston, wherein the linear motor comprises an outer stator, a magnet tank and an inner stator, the refrigerator body and the outer stator are fixedly arranged in the pressure shell, the inner stator is arranged in the refrigerator body, the magnet tank is arranged in the power piston to enable the magnet tank to be in clearance fit with the outer stator and the inner stator, the power piston is arranged in the refrigerator body, the gas distribution piston is partially positioned in the power piston and coaxial with the power piston, an expansion cavity is formed between the pressure shell and the gas distribution piston, and a compression cavity is formed between the gas distribution piston and the power piston.

2. The refrigerator according to claim 1, wherein: the magnet pot comprises a pressing ring, magnetic steel and a base, wherein the pressing ring and the base are fixed at two ends of the magnetic steel.

3. The refrigerator according to claim 2, wherein: the base is provided with an air hole, so that gas working media in the magnet tank flow smoothly, and the resistance of the magnet tank to reciprocating motion is reduced.

4. The refrigerator according to claim 1, wherein: the refrigerator still includes heat transfer system, heat transfer system includes the regenerator subassembly, the regenerator subassembly cover is located distribution piston tip, the regenerator subassembly includes sleeve, filter pulp and film, the film twine in the sleeve, filter pulp is located the exit position at regenerator subassembly both ends can filter, spacing, even air current, the film is equipped with a plurality of archs, and each arch is equipped with the opening, the film twine in the sleeve forms a plurality of layers, and the air current passes through the opening flows between different layers, constitutes complicated gas circulation route to disturb working medium and flow.

5. The refrigerator according to claim 4, wherein: the cross section of the bulge is splayed.

6. The refrigerator according to claim 4, wherein: the film is made of polyethylene naphthalate.

7. The refrigerator according to claim 1, wherein: the distribution piston comprises a piston main body, a gas bearing and a porous body, wherein the piston main body is of a hollow structure, the piston main body is provided with a communicating hole and a recess, the recess is positioned on the outer surface of the piston main body, the communicating hole penetrates through the piston main body, two ends of the communicating hole are respectively communicated with the interior of the piston main body and the recess, the gas bearing presses the porous body on the inner surface of the piston main body, and a gas working medium in the piston main body flows out of the communicating hole and the recess through the gas bearing and the porous body under the action of gas pressure, so that a gas film gap is formed between the piston main body and the machine body to form sealing.

8. The refrigerator according to claim 7, wherein: the outer surface of the piston main body is plated with engineering plastics.

9. The refrigerator according to claim 8, wherein: the engineering plastic is polytetrafluoroethylene.

10. The refrigerator according to claim 7, wherein: the porous body is made of ultra-high molecular weight polyethylene, and the porosity is 30-40%.