CN107420309B - Piston for rotary compressor and preparation method thereof - Google Patents
Piston for rotary compressor and preparation method thereof Download PDFInfo
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- CN107420309B CN107420309B CN201710766219.6A CN201710766219A CN107420309B CN 107420309 B CN107420309 B CN 107420309B CN 201710766219 A CN201710766219 A CN 201710766219A CN 107420309 B CN107420309 B CN 107420309B
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- piston
- ring body
- rotary compressor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/10—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass pistons
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/20—Rotors
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Compressor (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
The invention discloses a piston for a rotary compressor and a preparation method thereof, wherein the piston is formed by welding an inner ring body and an outer ring body, and the outer ring body is formed by a 20CrMnTi steel pipe or steel rod. The piston for the rotary compressor not only can reduce the energy consumption of the rotary compressor, but also has excellent wear resistance and surface smoothness, better fatigue resistance, corrosion resistance and longer service life.
Description
Technical Field
The invention belongs to the field of compressors, and particularly relates to a piston for a rotary compressor and a preparation method thereof.
Background
As the market demand for air conditioning energy efficiency levels increases, air conditioning manufacturers have also set higher demands for compressor energy efficiency. In the rotor type compressor, friction power consumption accounts for about 8% of the total power consumption, and weight reduction of the piston is an effective direction for reducing the compressor efficiency. The manufacturing of the compressor piston generally adopts a die casting or continuous casting tubular method, namely, the pipe body is cast firstly, then the pipe body is cut, and then the inner hole, the outer circle turning, the peeling and the grinding are carried out, so that the manufacturing process is complex, the cost is high, and the raw material utilization rate is low. Therefore, a piston for a rotary compressor needs to be further improved.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. To this end, an object of the present invention is to propose a piston for a rotary compressor and a method for its preparation. The piston for the rotary compressor provided by the invention not only can reduce the energy consumption of the rotary compressor, but also has excellent wear resistance and surface finish, better fatigue resistance, corrosion resistance and longer service life.
According to one aspect of the invention, the invention proposes a piston for a rotary compressor, the piston being welded from an inner ring body and an outer ring body, the outer ring body being formed from a 20CrMnTi steel tube or rod.
According to the piston for the rotary compressor, compared with the traditional method for preparing the gray cast iron piston by adopting a casting process, the piston for the rotary compressor adopts a mode that the inner ring body and the outer ring body are welded, so that the structure of the piston can be selected more flexibly, the weight of the piston can be reduced by changing the structures of the inner ring body and the outer ring body, and the energy consumption of the rotary compressor is further reduced. In addition, the outer ring body is formed by a 20CrMnTi steel pipe or steel rod, so that the crude product of the outer ring body has better processing performance, and the piston for the rotary compressor has better wear resistance, surface smoothness, fatigue resistance, corrosion resistance and longer service life.
In addition, the piston for a rotary compressor according to the above embodiment of the present invention may have the following additional technical features:
in some embodiments of the invention, a cavity is formed between the inner ring and the outer ring. Therefore, the weight of the piston for the rotary compressor can be effectively reduced, and the energy consumption of the rotary compressor can be further reduced.
In some embodiments of the invention, the upper and lower ends of the outer ring body are formed with inwardly extending upper and lower inner flanges, and the upper and lower inner flanges are adapted to be connected to the inner ring body by welding, the inner and outer ring bodies enclosing the cavity with the upper and lower inner flanges. Thus, the weight of the piston for the rotary compressor can be further reduced, and the energy consumption of the rotary compressor can be further reduced.
In some embodiments of the invention, at least one outer support portion extending inwardly is formed on an inner wall of the outer ring body, the outer support portion being connected to the inner ring body. Thus, the structural stability of the piston for the rotary compressor can be further improved while the weight of the piston for the rotary compressor is reduced.
In some embodiments of the invention, the outer support is annular and divides the cavity into at least two subcavities. This can further improve the structural stability of the piston for the rotary compressor.
In some embodiments of the invention, the upper and lower ends of the inner ring body are formed with outwardly extending upper and lower flanges, and the upper and lower flanges are adapted to be joined to the outer ring body by welding, the inner ring body and the outer ring body enclosing the cavity with the upper and lower flanges. Thus, the weight of the piston for the rotary compressor can be further reduced, and the energy consumption of the rotary compressor can be further reduced.
In some embodiments of the invention, at least one inner support portion extending outwardly is formed on an outer wall of the inner ring body, the inner support portion being connected to the outer ring body. Thus, the structural stability of the piston for the rotary compressor can be further improved while the weight of the piston for the rotary compressor is reduced.
In some embodiments of the invention, the inner support is annular and divides the cavity into at least two subcavities. This can further improve the structural stability of the piston for the rotary compressor.
According to a second aspect of the present invention, the present invention also provides a method for preparing a piston for a rotary compressor according to the above embodiment of the present invention, including:
cutting a 20CrMnTi steel rod or spinning a 20CrMnTi steel pipe to obtain an outer ring crude product;
cutting a steel bar of bearing steel, alloy steel or carbon steel or spinning a steel pipe of the bearing steel, alloy steel or carbon steel so as to obtain an inner ring body crude product;
welding wires are placed between the outer ring body crude product and the inner ring body crude product, and then the welding wires are placed in a heating furnace for heating and welding so as to obtain a piston crude product;
carburizing, quenching and tempering the crude piston product to obtain a piston preform; and
the piston preform is finished in order to obtain the piston for the rotary compressor.
The method for manufacturing the piston for the rotary compressor, disclosed by the embodiment of the invention, not only can effectively replace the traditional method for manufacturing the gray cast iron piston by adopting a casting process, but also has the following advantages: firstly, the mode that adopts interior ring body and outer ring body to weld to form not only can more nimble select the structure of piston, but also can lighten the weight of piston through changing the structure of interior ring body and outer ring body, and then reduce rotary compressor's energy consumption. Secondly, the method can not only remarkably reduce the internal and external diameters and the height of the inner ring body and the outer ring body of the piston for the rotary compressor and remarkably reduce the cutting amount of rough machining, but also remarkably reduce the manufacturing cost and the pollution of industrial three wastes to the environment, and has the advantages of simplicity, easiness, less material consumption, high raw material utilization rate, environmental protection and the like. Thirdly, the outer ring body is formed by a 20CrMnTi steel pipe or steel rod, so that not only can the crude product of the outer ring body have better processing performance, but also the piston for the rotary compressor has more excellent wear resistance and surface smoothness, better fatigue resistance, corrosion resistance and longer service life.
In some embodiments of the invention, the heat welding is accomplished at a temperature of 1000-1200 ℃ for 20-60 minutes. This can further improve the structural stability of the piston for the rotary compressor.
In some embodiments of the invention, the carburizing treatment temperature is 850-1000 degrees celsius, the quenching treatment temperature is 850-950 degrees celsius, and the tempering treatment temperature is 350-550 degrees celsius. Thus, the piston for the rotary compressor can be further endowed with excellent performances such as wear resistance, fatigue resistance, corrosion resistance, longer service life and the like.
Drawings
Fig. 1 is a schematic structural view of a piston for a rotary compressor according to an embodiment of the present invention.
Fig. 2 is a schematic structural view of a piston for a rotary compressor according to still another embodiment of the present invention.
Fig. 3 is a schematic structural view of a piston for a rotary compressor according to still another embodiment of the present invention.
Fig. 4 is a schematic structural view of a piston for a rotary compressor according to still another embodiment of the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
According to one aspect of the present invention, there is provided a piston for a rotary compressor, the piston being formed by welding an inner ring body 10 and an outer ring body 20, the outer ring body 20 being formed of a 20CrMnTi steel pipe or rod.
According to the piston for the rotary compressor, compared with the traditional method for preparing the gray cast iron piston by adopting a casting process, the method for welding the inner ring body 10 and the outer ring body 20 can flexibly select the structure of the piston, and the weight of the piston can be reduced by changing the structures of the inner ring body 10 and the outer ring body 20, so that the energy consumption of the rotary compressor is reduced. In addition, the outer ring body 20 is formed by a 20CrMnTi steel pipe or steel rod, so that not only can the crude product of the outer ring body 20 have better processing performance, but also the piston for the rotary compressor has more excellent wear resistance and surface smoothness, better fatigue resistance, corrosion resistance and longer service life.
The piston for a rotary compressor according to the above embodiment of the present invention will be described in detail with reference to fig. 1 to 4.
According to an embodiment of the present invention, as shown in fig. 1-2, a cavity 30 may be formed between the inner ring body 10 and the outer ring body 20. According to the invention, the cavity 30 is formed between the inner ring body 10 and the outer ring body 20, so that the weight of the piston for the rotary compressor can be effectively reduced, the friction power consumption is obviously reduced, and the energy consumption of the rotary compressor is further reduced.
According to an embodiment of the present invention, as shown in fig. 3, the upper and lower ends of the outer ring body 20 may be formed with upper and lower inner flanges 21 and 22 extending inwardly, and the upper and lower inner flanges 21 and 22 are adapted to be coupled to the inner ring body 10 by welding, and the inner and outer ring bodies 10 and 20 and the upper and lower inner flanges 21 and 22 define a cavity 30. By adopting the structure, the invention not only can form the cavity 30 between the inner ring body 10 and the outer ring body 20, but also can further change the volume of the cavity 30 by changing the lengths of the upper inner flanging 21 and the lower inner flanging 22, thereby further reducing the weight of the piston for the rotary compressor and further reducing the energy consumption of the rotary compressor.
According to an embodiment of the present invention, as shown in fig. 3, at least one outer support 23 extending inward may be formed on the inner wall of the outer ring body 20, and the outer support 23 is connected to the inner ring body 10. In the invention, the outer supporting part 23 is arranged on the inner wall of the outer ring body 20, so that the outer ring body 20 and the inner ring body 10 are respectively connected with at least one outer supporting part 23 through the upper inner flanging 21, the lower inner flanging 22, and the combination between the outer ring body 20 and the inner ring body 10 is more stable. Thus, the structural stability of the piston for the rotary compressor can be further improved while the weight of the piston for the rotary compressor is reduced.
According to an embodiment of the present invention, the outer support 23 may have a circular ring shape and divide the cavity into at least two sub-cavities. In the invention, the annular outer supporting part 23 is selected, so that the contact area between the outer supporting part 23 and the outer wall of the inner ring body 10 can be further increased, and the combination between the outer ring body 20 and the inner ring body 10 is more stable. Thus, the structural stability of the piston for the rotary compressor can be further improved while the weight of the piston for the rotary compressor is reduced.
According to an embodiment of the present invention, as shown in fig. 4, the upper and lower ends of the inner ring body 10 may be formed with upper and lower flanges 11 and 12 extending outwardly, and the upper and lower flanges 11 and 12 may be adapted to be coupled to the outer ring body 20 by welding, and the inner and outer ring bodies 10 and 20 and the upper and lower flanges 11 and 12 may define a cavity 30. Thus, the weight of the piston for the rotary compressor can be further reduced, and the energy consumption of the rotary compressor can be further reduced. By adopting the structure, the invention not only can form the cavity 30 between the inner ring body 10 and the outer ring body 20, but also can further change the volume of the cavity 30 by changing the lengths of the upper flanging 11 and the lower flanging 12, thereby further reducing the weight of the piston for the rotary compressor and further reducing the energy consumption of the rotary compressor.
According to an embodiment of the present invention, as shown in fig. 4, at least one inner support portion 13 extending outwardly may be formed on the outer wall of the inner ring body 10, and the inner support portion 13 is connected to the outer ring body 20. In the invention, the outer supporting part 13 is arranged on the outer wall of the inner ring body 10, so that the outer ring body 20 and the inner ring body 10 are respectively connected with at least one inner supporting part 13 through the upper outer flanging 11, the lower outer flanging 12, and the combination between the outer ring body 20 and the inner ring body 10 is more stable. Thus, the structural stability of the piston for the rotary compressor can be further improved while the weight of the piston for the rotary compressor is reduced.
According to an embodiment of the present invention, the inner support 13 may have a circular ring shape and divide the cavity 30 into at least two sub-cavities. In the invention, the contact area between the inner supporting part 13 and the inner wall of the outer ring body 20 can be further increased by selecting the annular inner supporting part 13, so that the combination between the outer ring body 20 and the inner ring body 10 is more stable. Thus, the structural stability of the piston for the rotary compressor can be further improved while the weight of the piston for the rotary compressor is reduced.
According to a second aspect of the present invention, the present invention also provides a method for preparing a piston for a rotary compressor according to the above embodiment of the present invention, including: cutting the 20CrMnTi steel rod or spinning the 20CrMnTi steel pipe to obtain a crude product of the outer ring body 20; cutting a steel rod of bearing steel, alloy steel or carbon steel or spinning a steel pipe of the bearing steel, alloy steel or carbon steel so as to obtain a crude product of the inner ring body 10; welding wires are placed between the crude products of the outer ring body 20 and the crude products of the inner ring body 10, and then the welding wires are placed in a heating furnace for heating and welding so as to obtain crude products of the pistons; carburizing, quenching and tempering the crude piston product to obtain a piston preform; and finishing the piston preform to obtain a piston for a rotary compressor.
The method for preparing the piston for the rotary compressor, disclosed by the embodiment of the invention, not only can be used for effectively replacing the traditional method for preparing the gray cast iron piston by adopting a casting process, but also has the following advantages: first, the mode that adopts interior ring body 10 and outer ring body 20 to weld to become not only can more nimble select the structure of piston, but also can lighten the weight of piston through changing the structure of interior ring body 10 and outer ring body 20, and then reduce rotary compressor's energy consumption. Secondly, by adopting the method, the rough machining process of the inner diameter and the outer diameter as well as the height of the piston inner ring body 10 and the piston outer ring body 20 for the rotary compressor can be remarkably reduced, the rough machining cutting amount can be remarkably reduced, the manufacturing cost and the pollution of industrial three wastes to the environment can be remarkably reduced, and the method has the advantages of simplicity, easiness, less material consumption, high raw material utilization rate, environmental protection and the like. Third, the outer ring body 20 is formed by a 20CrMnTi steel pipe or steel rod, so that not only can the crude product of the outer ring body have better processing performance, but also the piston for the rotary compressor has more excellent wear resistance and surface smoothness, better fatigue resistance, corrosion resistance and longer service life.
The method of preparing a piston for a rotary compressor according to the above embodiment of the present invention will be described in detail.
According to an embodiment of the present invention, the base material of the outer ring body 20 of the piston for the rotary compressor may be 20CrMnTi, and the base material of the inner ring body 10 may be bearing steel, alloy steel or carbon steel. The outer wall of the outer ring body 20 of the piston for the rotary compressor is most severely worn in a friction condition in a working state, and the 20CrMnTi is adopted as a base material of the outer ring body 20, so that a crude product of the outer ring body 20 has the advantages of good processing performance and small processing deformation, and the outer ring body 20 still has higher strength and toughness after quenching treatment, thereby the outer ring body 20 has better performances such as wear resistance, fatigue resistance, corrosion resistance, longer service life and the like, and further the comprehensive performance and the service life of the piston for the rotary compressor can be further improved. According to an embodiment of the present invention, the base material of the inner ring body 10 may preferably be 20CrMnTi, GCr15, 20Cr, 40Cr, 45 steel, 40 steel, or 20 steel. Therefore, the comprehensive performance of the piston for the rotary compressor can be further improved, and the piston for the rotary compressor has more excellent wear resistance, surface smoothness, better fatigue resistance, corrosion resistance and longer service life.
According to an embodiment of the invention, the heat welding may be performed at a temperature of 1000-1200 c for 20-60 minutes. The present invention can not only successfully weld the inner ring body 10 and the outer ring body 20 by adopting the above-mentioned heating welding conditions, but also can further improve the structural stability of the piston for the rotary compressor.
According to the embodiment of the invention, the fit clearance of the welding position between the inner ring body 10 and the outer ring body 20 can be 0.005-0.1mm, so that the pre-installation of the inner ring and the outer ring of the piston before welding can be facilitated, the solder can be effectively introduced into the fit clearance of the inner ring and the outer ring of the piston, and the welding strength and reliability are ensured.
According to an embodiment of the present invention, the inner ring body 10 and the outer ring body 20 of the piston for the rotary compressor may be formed by welding in a heating furnace using a brazing material or a brazing material. Therefore, the piston for the rotary compressor can be prepared by effectively utilizing the inner ring body 10 and the outer ring body 20, and the piston for the rotary compressor has better structural stability.
According to an embodiment of the present invention, the carburizing treatment may be performed at a temperature of 850-1000 degrees celsius. Therefore, the depth of carburized layer of the piston crude product can reach 0.15-0.5mm, so that the surface hardness and wear resistance of the piston for the rotary compressor are further improved, the toughness and plasticity of low carbon steel are still kept in the central part of the piston for the rotary compressor, and the piston for the rotary compressor further has the performances of excellent wear resistance, fatigue resistance, corrosion resistance, longer service life and the like.
According to an embodiment of the present invention, the temperature of the quenching treatment may be 850-950 degrees celsius. By adopting the quenching treatment temperature, the prepared piston preform has better hardness and toughness, and further the finally prepared piston for the rotary compressor has excellent wear resistance, fatigue resistance, higher impact toughness, longer service life and other performances.
According to an embodiment of the present invention, the quenching treatment may be oil quenching. According to the invention, oil quenching is adopted to further reduce the deformation of the crude piston product after quenching treatment, and the finally prepared piston for the rotary compressor has the performances of excellent surface finish, corrosion resistance, longer service life and the like.
According to an embodiment of the present invention, the tempering treatment may be performed at a temperature of 350-550 degrees celsius. By adopting the tempering temperature, the invention can effectively eliminate the residual stress of the crude piston product after quenching treatment, so that the piston preform has higher strength and better shaping and toughness, and further the piston for the rotary compressor has excellent wear resistance, fatigue resistance, corrosion resistance, longer service life and other performances.
According to the specific embodiment of the invention, the carburization, quenching and tempering conditions of the above embodiment of the invention are adopted to carry out carburization, quenching and tempering on the crude piston product subjected to rough machining, so that the hardness of the piston for the rotary compressor can reach HRC30-55. Therefore, the piston for the rotary compressor can further have the performances of better wear resistance, higher impact toughness, fatigue resistance, longer service life and the like.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (8)
1. The method for preparing the piston for the rotary compressor is characterized in that the piston is formed by welding an inner ring body and an outer ring body, and the outer ring body is formed by a 20CrMnTi steel pipe or steel rod;
the method for preparing the piston for the rotary compressor comprises the following steps:
cutting a 20CrMnTi steel rod or spinning a 20CrMnTi steel pipe to obtain an outer ring crude product;
cutting a steel bar of bearing steel, alloy steel or carbon steel or spinning a steel pipe of the bearing steel, alloy steel or carbon steel so as to obtain an inner ring body crude product;
placing welding wires between the outer ring body crude product and the inner ring body crude product, and then placing the welding wires in a heating furnace for heating and welding so as to obtain a piston crude product, wherein the heating and welding are completed by heat preservation for 20-60 minutes at the temperature of 1000-1200 ℃;
carburizing, quenching and tempering the piston crude product to obtain a piston preform, wherein the temperature of the carburizing is 850-1000 ℃, the temperature of the quenching is 850-950 ℃, and the temperature of the tempering is 350-550 ℃;
the piston preform is finished in order to obtain the piston for the rotary compressor.
2. The method of manufacturing a piston for a rotary compressor of claim 1, wherein a cavity is formed between the inner ring body and the outer ring body.
3. The method of manufacturing a piston for a rotary compressor according to claim 2, wherein the upper and lower ends of the outer ring body are formed with upper and lower inwardly extending inner flanges, and the upper and lower inner flanges are adapted to be connected to the inner ring body by welding, and the inner and outer ring bodies and the upper and lower inner flanges enclose the cavity.
4. A method of manufacturing a piston for a rotary compressor according to claim 3, wherein at least one outer support portion extending inward is formed on an inner wall of the outer ring body, and the outer support portion is connected to the inner ring body.
5. The method of manufacturing a piston for a rotary compressor of claim 4, wherein the outer support is annular and divides the cavity into at least two sub-cavities.
6. The method of manufacturing a piston for a rotary compressor according to claim 2, wherein the inner ring body is formed at upper and lower ends thereof with upper and lower outwardly extending flanges, and the upper and lower flanges are adapted to be connected to the outer ring body by welding, and the inner ring body and the outer ring body are peripherally combined with the upper and lower flanges to form the cavity.
7. The method of manufacturing a piston for a rotary compressor of claim 6, wherein at least one inner support portion is formed on an outer wall of the inner ring body to extend outwardly, the inner support portion being connected to the outer ring body.
8. The method of manufacturing a piston for a rotary compressor of claim 7, wherein the inner support portion is annular and divides the cavity into at least two sub-cavities.
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| CN201710766219.6A CN107420309B (en) | 2017-08-30 | 2017-08-30 | Piston for rotary compressor and preparation method thereof |
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| CN201710766219.6A CN107420309B (en) | 2017-08-30 | 2017-08-30 | Piston for rotary compressor and preparation method thereof |
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| CN112833016B (en) * | 2021-03-22 | 2022-08-02 | 广东美芝精密制造有限公司 | Hollow piston manufacturing method, hollow piston, rotary compressor and air conditioner |
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| CN102312838A (en) * | 2010-10-22 | 2012-01-11 | 台州市百达制冷有限公司 | Piston for rotary compressor and manufacturing method of piston |
| CN107255053B (en) * | 2013-06-07 | 2019-11-05 | 株式会社理研 | Piston ring raw material |
| CN103410732B (en) * | 2013-08-22 | 2015-10-07 | 浙江百达精工股份有限公司 | Rotary-type translation piston compressor |
| CN105041658B (en) * | 2015-08-11 | 2018-06-12 | 宁波甬微集团有限公司 | A kind of refrigeration compressor rolling piston and its manufacturing method |
| CN105201783B (en) * | 2015-10-22 | 2017-08-29 | 安徽美芝精密制造有限公司 | Compressor, piston of compressor and preparation method thereof |
| CN106523371A (en) * | 2016-12-08 | 2017-03-22 | 宁波甬微集团有限公司 | Rolling piston for rotary refrigerating compressor |
| CN207598508U (en) * | 2017-08-30 | 2018-07-10 | 广东美芝制冷设备有限公司 | Rotary compressor piston |
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