CN213575124U - Crankshaft blank of rotary compressor - Google Patents
Crankshaft blank of rotary compressor Download PDFInfo
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- CN213575124U CN213575124U CN202022600506.XU CN202022600506U CN213575124U CN 213575124 U CN213575124 U CN 213575124U CN 202022600506 U CN202022600506 U CN 202022600506U CN 213575124 U CN213575124 U CN 213575124U
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Abstract
The utility model provides a rotary compressor bent axle blank, bent axle blank assembly method and bent axle blank batch manufacturing method belongs to liquid varactor formula machinery technical field. It has solved the high problem of current rotary compressor bent axle blank manufacturing cost. The compressor crankshaft blank is reasonably split into a long shaft, a short shaft and an eccentric sleeve integrally, one end of the short shaft penetrates through a shaft hole of the eccentric sleeve, and the short shaft is tightly matched with the eccentric sleeve; the long shaft and the short shaft are coaxially arranged, and one end of the long shaft and one end of the short shaft as well as one end of the long shaft and the eccentric sleeve are fixedly connected by welding. The long shaft, the short shaft and the eccentric sleeve can flexibly select materials and manufacture processes according to technical requirements to manufacture parts with various technical requirements; when crankshafts with different technical requirements are manufactured, parts with proper technical requirements can be selected according to requirements for assembly, so that research and development and manufacturing costs are reduced, and manufacturing efficiency is improved.
Description
Technical Field
The utility model belongs to the technical field of liquid varactor formula machinery, a rotary compressor, especially a rotary compressor bent axle blank are related to.
Background
The rotary compressor is particularly suitable for small-sized air conditioners, and particularly has wider application in household air conditioners. With the social development, the sales volume of the rotary compressor and the air conditioner is increased year by year; the technical requirements of the rotary compressor on environmental protection, energy conservation, consumption reduction and the like are continuously improved, and low-fluorine and fluorine-free refrigerants are forcibly used in air-conditioning compressors and air-conditioners for a limited period.
The compressor adopting the refrigerants such as R134a, R407c and R410a has an operating pressure which is improved by 60% as compared with the compressor adopting the refrigerant R22, namely, the compressor operating pressure which is improved from 16kg/cm to 26-28 kg/cm. The variable frequency compressor has larger rotating speed and frequent speed change than the fixed frequency compressor. The pressure of a suction inlet of a compressor of the carbon dioxide heat pump water heater reaches 3.5-4Mpa, and the pressure of an outlet reaches 8-12 Mpa; the pressure at the inlet and the outlet of the compressor of the carbon dioxide heat pump water heater is 5-10 times of the pressure at the inlet and the outlet of the traditional refrigerant rotary compressor. In a word, the novel rotary compressor has higher technical requirements on the strength, the wear resistance, the fatigue resistance, the service life and the like of the crankshaft.
At present, compressor accessory production enterprises make an optimal manufacturing process according to the technical requirements of compressor crankshafts, and the manufacturing processes of crankshafts such as fixed-frequency compressor crankshafts, variable-frequency compressor crankshafts, carbon dioxide heat pump water heater compressor crankshafts and the like are different, and adopted equipment is not completely the same. The production area is increasing, production equipment is more and more, the input cost is higher and more, the equilibrium of rate of equipment utilization is relatively poor that compressor accessory manufacturing enterprise has in actual production, and these problems lead to compressor spare part cost can't reduce, and production efficiency can't improve.
Disclosure of Invention
The utility model provides a compressor crankshaft blank, the to-be-solved technical problem of the utility model is how to propose a compressor crankshaft blank that can be applicable to different technical production.
The to-be-solved technical problem of the utility model can be realized through the following technical scheme: a compressor crankshaft blank consists of a hollow long shaft, a solid short shaft and an eccentric sleeve with a shaft hole, wherein one end part of the short shaft penetrates through the shaft hole of the eccentric sleeve, and the short shaft is tightly matched with the eccentric sleeve; the long shaft and the short shaft are coaxially arranged, and one end of the long shaft and one end of the short shaft as well as one end of the long shaft and the eccentric sleeve are fixedly connected by welding.
Compressor crankshaft blanks refer to unmachined parts. The long shaft adopts a hollow structure, so that a central hole does not need to be drilled in the long shaft in subsequent processing, the processing efficiency is improved, and the processing cost is reduced. The short shaft adopts a solid structure, so that the strength of the short shaft is higher, and the short shaft is prevented from deforming in the process of tight fit with the eccentric sleeve as much as possible. Splitting a compressor crankshaft blank into a long shaft, a short shaft and an eccentric sleeve, so that all parts are manufactured independently; and each part can be manufactured with multiple specifications.
In the compressor crankshaft blank, the fit interference of the short shaft and the eccentric sleeve is 0.02mm-0.04 mm.
In the compressor crankshaft blank described above, the eccentric sleeve has a weight-reducing hole therein.
In the compressor crankshaft blank, the short shaft is provided with a spline section, and the spline section is in spline fit with the eccentric sleeve.
In the compressor crankshaft blank, the short shaft is also provided with a welding connection section, the welding connection section is positioned in the cavity of the long shaft, and the welding connection section is fixedly connected with the long shaft through welding.
In the compressor crankshaft blank, the seam between the short shaft and the eccentric sleeve is opposite to the end surface of the long shaft.
In the above-described compressor crankshaft blank, the weld also secures the stub shaft and the eccentric sleeve together.
The assembling method of the compressor crankshaft blank comprises the following steps in sequence, wherein in the first step, a short shaft and a shaft hole of an eccentric sleeve are coaxially arranged, then the short shaft and the eccentric sleeve are pressed together, and the short shaft penetrates through the shaft hole of the eccentric sleeve; and secondly, arranging the long shaft and the short shaft coaxially, and welding one end of the long shaft, the short shaft and the eccentric sleeve together to obtain the compressor crankshaft blank.
The short shaft and the eccentric sleeve are pressed together during assembly, so that friction welding operation is facilitated, and one end of the long shaft can be welded with the short shaft and the eccentric sleeve by one-time friction welding. The compressor crankshaft blank is split into the long shaft, the short shaft and the eccentric sleeve, so that the assembly is favorably carried out by adopting mature close fit press fitting and friction welding processes, the manufacturing difficulty is further reduced, the assembly cost is reduced, and the assembly efficiency and the assembly quality consistency are improved.
A compressor crankshaft blank batch manufacturing method is sequentially carried out according to the following sequential steps, wherein in the first step, a long shaft, a short shaft and an eccentric sleeve are manufactured in batch without sequence, at least one part of the long shaft, the short shaft and the eccentric sleeve is manufactured into a plurality of batches, and the technical requirements of the parts of the plurality of batches are not completely the same;
secondly, selecting the long shaft, the short shaft and the eccentric sleeve, wherein at least one part of the long shaft, the short shaft and the eccentric sleeve is selected from a plurality of batches, and the technical requirements of the selected parts are not completely the same; the assembling method is adopted for assembling, and compressor crankshaft blanks with various technical requirements are obtained.
The same part is usually manufactured in multiple batches and the technical requirements of such part are not exactly the same, i.e. the same part has multiple technical requirements; for example, the eccentric sleeve which is not nitrided and sintered by powder metallurgy and the eccentric sleeve which is nitrided and sintered by powder metallurgy have two technical requirements.
The compressor crankshaft blank is assembled by selecting a long shaft, a short shaft and an eccentric sleeve which are made of proper materials and by proper processes according to the technical requirements of the compressor crankshaft blank. For example, the long shaft and the short shaft of the crankshaft of the rotary compressor with the normal specified frequency are both made of low-carbon steel, and the eccentric sleeve is formed by powder metallurgy sintering; the long shaft and the short shaft of the crankshaft of the variable-frequency rotary compressor are both made of low-carbon steel, the long shaft and the short shaft are quenched, and the eccentric sleeve is formed by sintering through powder metallurgy; the long shaft and the short shaft of the crankshaft of the carbon dioxide heat pump water heater compressor are both made of medium carbon steel, the long shaft and the short shaft are quenched, the eccentric sleeve is formed by sintering through powder metallurgy, and the eccentric sleeve is nitrided.
In summary, the same part can be applied to crankshafts with different technical requirements, for example, an eccentric sleeve formed by sintering can be applied to a crankshaft of a rotary compressor with a normal specified frequency and can also be applied to a crankshaft of a variable-frequency rotary compressor; the manufacturing processes of the same parts in the crankshafts are mostly the same in different technical requirements, for example, the eccentric sleeve which is not subjected to nitriding treatment can be applied to the crankshaft of the variable-frequency rotary compressor, and the eccentric sleeve which is subjected to nitriding treatment can be applied to the crankshaft of the compressor of the carbon dioxide heat pump water heater.
Compared with the prior art, the compressor crankshaft blank is reasonably split into three parts, namely a long shaft, a short shaft and an eccentric sleeve, so that the three parts can flexibly select materials and manufacture processes according to technical requirements, the crankshaft is guaranteed to meet the technical requirements, and parts with various technical requirements can be manufactured. More importantly, the parts with various technical requirements are usually different only in materials or different in heat treatment process, so that most manufacturing processes of the same part are the same.
For a production enterprise producing crankshafts with different technical requirements at the same time, long shafts, short shafts and eccentric sleeves with different technical requirements can be flexibly selected according to the technical requirements of the crankshafts for assembly, the crankshafts are guaranteed to meet the technical requirements through reasonable tests, parts with the lowest manufacturing cost can be selected, and the manufacturing cost of the crankshafts is further reduced.
The compressor crankshaft blank is produced by adopting the batch manufacturing method, the research and development cost is obviously reduced, the production flow is simplified, and the research and development and production efficiency are improved; and improve equipment utilization and equipment use balance. In summary, the compressor crankshaft blank structure and the compressor crankshaft blank batch manufacturing method not only ensure that production enterprises can produce crankshafts with different technical requirements, but also ensure that the crankshafts meet the technical requirements, reduce the manufacturing cost of the crankshafts and improve the production efficiency of the crankshafts.
Drawings
Fig. 1 is a perspective view of a compressor crankshaft blank.
FIG. 2 is an exploded view of a compressor crankshaft blank.
Fig. 3 is a perspective view showing a state in which the stub shaft and the eccentric sleeve are press-fitted together.
FIG. 4 is a schematic cross-sectional view of a compressor crankshaft blank.
In the figure, 1, long axis; 2. a minor axis; 2a, welding a connecting section; 2b, a spline section; 2c, a main shaft section; 3. an eccentric sleeve; 3a, a shaft hole; 3b, removing heavy holes; 4. a gap.
Detailed Description
The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.
As shown in fig. 1 to 4, a compressor crankshaft blank is composed of a hollow major axis 1, a solid minor axis 2 and an eccentric sleeve 3.
Minor axis 2 is welding connection section 2a, spline section 2b and main shaft section 2c from one end to the other end in proper order, has the spline tooth on the spline section 2 b. The eccentric sleeve 3 is internally provided with a shaft hole 3a, the shaft hole 3a deviates from the shaft center of the eccentric sleeve 3, and the side surface of the shaft hole 3a is provided with a spline groove. One end part of the short shaft 2 is arranged in the shaft hole 3a of the eccentric sleeve 3 in a penetrating way; specifically, the spline section 2b of the short shaft 2 is positioned in the shaft hole 3a, spline teeth are embedded into spline grooves of the shaft hole 3a, and the short shaft 2 is tightly matched with the eccentric sleeve 3; the interference range is 0.02mm-0.04 mm. The short shaft 2 and the eccentric sleeve 3 are assembled by adopting a mature press-fitting process, and the connecting structure between the short shaft 2 and the eccentric sleeve 3 has the advantages of high connecting strength, high assembling efficiency, low assembling cost and the like, and ensures that the eccentric sleeve 3 cannot rotate circumferentially relative to the short shaft 2.
The eccentric sleeve 3 is also internally provided with a weight removing hole 3b, so that the eccentric weight can be reduced, the eccentric moment and noise of a crankshaft during the operation of the compressor are reduced, the performance of the compressor is improved, and the energy consumption of the compressor is reduced.
The long shaft 1 and the short shaft 2 are coaxially arranged, and one end of the long shaft 1 is fixedly connected with one end of the short shaft 2 through welding. The welding connection section 2a is positioned in the cavity of the long shaft 1, a gap 4 is formed between the outer side surface of the welding connection section 2a and the inner side surface of the long shaft 1, and molten liquid generated by welding fills the gap 4, so that the welding connection area between the long shaft 1 and the short shaft 2 is increased, and the connection strength between the long shaft 1 and the short shaft 2 is improved. One end of the long shaft 1 is fixedly connected with the eccentric sleeve 3 in a welding mode, so that the installation firmness of the long shaft 1 is improved, and the short shaft 2 is prevented from axially moving with the eccentric sleeve 3.
As shown in fig. 1 to 4, a method for assembling a compressor crankshaft blank is sequentially carried out according to the following sequential steps, firstly, a short shaft 2 and a shaft hole 3a of an eccentric sleeve 3 are coaxially arranged, then the short shaft 2 and the eccentric sleeve 3 are pressed together, and the short shaft 2 penetrates through the shaft hole 3a of the eccentric sleeve 3; until the end surface of the spline section 2b is flush with the end surface of the eccentric sleeve 3. Secondly, the major axis 1 and the minor axis 2 are coaxially arranged, and the diameter of the shaft hole 3a is controlled to ensure that the seam between the minor axis 2 and the eccentric sleeve 3 is opposite to the end face of the major axis 1; and welding one end of the long shaft 1, the short shaft 2 and the eccentric sleeve 3 together by friction welding to obtain the compressor crankshaft blank. In the friction welding process, the materials of the long shaft 1, the short shaft 2 and the eccentric sleeve 3 are all melted, and the molten liquid not only enables the end part of the spline section 2b and the end part of the eccentric sleeve 3 to be fixedly connected with the long shaft, but also enables the short shaft 2 and the eccentric sleeve 3 to be fixedly connected together; the molten liquid is also filled into a gap 4 between the welding connection section 2a and the long shaft 1, and the welding connection section 2a and the long shaft 1 are fixedly connected together after the molten liquid is solidified; thereby obviously improving the connection strength among all parts. The friction welding is also a mature process, which not only can ensure the welding quality, but also can improve the production efficiency and reduce the production cost.
The batch manufacturing of the compressor crankshaft blank refers to batch manufacturing of crankshaft blanks with various technical requirements, such as crankshafts suitable for common fixed-frequency compressors, crankshafts suitable for variable-frequency compressors and crankshafts suitable for carbon dioxide heat pump water heater compressors.
The method for manufacturing the compressor crankshaft blank in batches sequentially comprises the following steps of firstly, manufacturing a long shaft 1, a short shaft 2 and an eccentric sleeve 3 in batches without sequence, and manufacturing a plurality of batches of at least one part of the three parts of the long shaft 1, the short shaft 2 and the eccentric sleeve 3, wherein the technical requirements of the parts of the plurality of batches are not completely the same. If the long shaft 1 has three technical requirements, 1, the long shaft 1 is formed by cutting a low-carbon steel seamless steel pipe; 2. the long shaft 1 is formed by cutting a low-carbon steel seamless steel pipe and then quenching; 3. the long shaft 1 is formed by cutting a medium carbon steel seamless steel pipe and then quenching. If the short shaft 2 has three technical requirements, the short shaft 1 and the short shaft 2 are made of low-carbon steel through cold extrusion molding; 2. the short shaft 2 is made of low-carbon steel serving as a raw material by cold extrusion molding and quenching treatment; 3. the short shaft 2 is made of medium carbon steel as a raw material by cold extrusion molding and quenching treatment. If the eccentric sleeve 3 has two technical requirements, 1, the eccentric sleeve 3 is formed by sintering through powder metallurgy, 2, the eccentric sleeve 3 is formed by sintering through powder metallurgy, and then nitriding treatment is carried out. As priority, the same part with different technical requirements has a plurality of same processes, so that the manufacturing cost of the part can be obviously reduced, and the material utilization rate and the equipment utilization rate are improved.
Secondly, selecting the long shaft 1, the short shaft 2 and the eccentric sleeve 3, wherein at least one part of the three parts of the long shaft 1, the short shaft 2 and the eccentric sleeve 3 is selected from a plurality of batches, and the technical requirements of the selected parts are not completely the same; the assembling method is adopted for assembling, and compressor crankshaft blanks with various technical requirements are obtained. In actual production, the long shaft 1, the short shaft 2 and the eccentric sleeve 3 with proper technical requirements are selected to be assembled according to the technical requirements of the crankshaft. For example, a crankshaft of a conventional frequency-regulated rotary compressor is provided with a long shaft 1 formed by cutting a low-carbon steel seamless steel pipe, a short shaft 2 formed by cold extrusion molding by using low-carbon steel as a raw material, and an eccentric sleeve 3 formed by sintering powder metallurgy. And for example, the crankshaft of the variable frequency rotary compressor is a long shaft 1 which is formed by cutting a low-carbon steel seamless steel pipe and is subjected to quenching treatment, a short shaft 2 which is formed by cold extrusion and is subjected to quenching treatment by taking low-carbon steel as a raw material, and an eccentric sleeve 3 which is formed by sintering powder metallurgy. And for example, a crankshaft of a carbon dioxide heat pump water heater compressor is a long shaft 1 which is formed by cutting a medium carbon steel seamless steel pipe and is subjected to quenching treatment, a short shaft 2 which is formed by cold extrusion and is subjected to quenching treatment by adopting medium carbon steel as a raw material, and an eccentric sleeve 3 which is formed by sintering powder metallurgy and is subjected to nitriding treatment.
Claims (5)
1. A compressor crankshaft blank consists of a long shaft (1), a solid short shaft (2) and an eccentric sleeve (3) with a shaft hole (3 a), wherein one end of the short shaft (2) is arranged in the shaft hole (3 a) of the eccentric sleeve (3) in a penetrating mode, and the long shaft (1) and the short shaft (2) are arranged coaxially; the novel eccentric bushing is characterized in that a spline section (2 b) is arranged in the short shaft (2), the short shaft (2) penetrates through a shaft hole (3 a) of the eccentric bushing (3), and the spline section (2 b) in the short shaft (2) is tightly matched with the eccentric bushing (3) through a spline; the long shaft (1) is of a hollow structure, the short shaft (2) is also provided with a welding connecting section (2 a), the welding connecting section (2 a) is positioned in the cavity of the long shaft (1), and one end of the long shaft (1) is fixedly connected with the welding connecting section (2 a) of the short shaft (2) and one end of the long shaft (1) is fixedly connected with the eccentric sleeve (3) by welding.
2. Compressor crankshaft blank according to claim 1, characterized in that the fit interference of the stub shaft (2) and the eccentric sleeve (3) is 0.02-0.04 mm.
3. A compressor crankshaft blank according to claim 1, characterized in that said eccentric sleeve (3) has a weight-reducing hole (3 b) therein.
4. A compressor crankshaft blank according to claim 1, 2 or 3, characterized in that the joint between the short axis (2) and the eccentric sleeve (3) is directly opposite the end face of the long axis (1).
5. A compressor crankshaft blank according to claim 4, characterised in that said welding also secures together the stub shaft (2) and the eccentric sleeve (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022600506.XU CN213575124U (en) | 2020-11-11 | 2020-11-11 | Crankshaft blank of rotary compressor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022600506.XU CN213575124U (en) | 2020-11-11 | 2020-11-11 | Crankshaft blank of rotary compressor |
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| CN213575124U true CN213575124U (en) | 2021-06-29 |
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| CN202022600506.XU Active CN213575124U (en) | 2020-11-11 | 2020-11-11 | Crankshaft blank of rotary compressor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112377514A (en) * | 2020-11-11 | 2021-02-19 | 浙江百达精工股份有限公司 | Crankshaft blank, crankshaft blank assembling method and crankshaft blank batch manufacturing method |
-
2020
- 2020-11-11 CN CN202022600506.XU patent/CN213575124U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112377514A (en) * | 2020-11-11 | 2021-02-19 | 浙江百达精工股份有限公司 | Crankshaft blank, crankshaft blank assembling method and crankshaft blank batch manufacturing method |
| CN112377514B (en) * | 2020-11-11 | 2024-06-04 | 浙江百达精工股份有限公司 | Batch manufacturing method for compressor crankshaft blanks |
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