CN104929940A - Piston of rotary compressor and rotary compressor with same and multistage compressor with same - Google Patents
Piston of rotary compressor and rotary compressor with same and multistage compressor with same Download PDFInfo
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- CN104929940A CN104929940A CN201510334580.2A CN201510334580A CN104929940A CN 104929940 A CN104929940 A CN 104929940A CN 201510334580 A CN201510334580 A CN 201510334580A CN 104929940 A CN104929940 A CN 104929940A
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Abstract
The invention discloses a piston of a rotary compressor and a rotary compressor with the same and a multistage compressor with the same. The piston is integrally formed, a central hole is formed in the piston, grooves are formed in the inner wall face of the central hole, and the two sides of the grooves are separated from the two end faces of the piston. According to the piston of the rotary compressor, machining and assembling are facilitated, the weight of the piston is reduced, the eccentric rotating inertia force of the rotary compressor with the piston is reduced, the weight of balance weights in the compressor can be reduced conveniently, the vibration and noise of the compressor are reduced at the same time, the reliability of the compressor for operating for a long time is improved, and the problem that performance is reduced due to leakage of coolant in an exhaust vent can be effectively prevented.
Description
Technical field
The present invention relates to compressor field, the piston especially relating to a kind of rotary compressor and the rotary compressor with it, multistage compressor.
Background technique
For rotary compressor, its main working parts is the rolling piston be nested on eccentric crankshaft, when compressor electric motor in the energized state, drive rolling piston is done eccentric motion by the eccentric crankshaft be connected with rotor in pump body compression chamber, thus realizes compression to cold media air.This kind of mechanism due to structure simple, compression efficiency is high, is therefore widely used in various technical field of refrigeration equipment.
Owing to have employed eccentric rotary structure, not on the rotary shaft, therefore compressor is in the running by generation rotating inertia force for the center of gravity of running gear, and eccentric direction is pointed in its direction.The existence of eccentric inertial force can make the vibration of compressor rise, and affects vibration and the reliability of compressor and refrigeration system.For solving the problem, in the design of existing compressor, offset mass eccentricity at two ends of rotor configuration equilibrium block.But increase equilibrium block and not only increase cost, and design process and assembly technology want complicated a lot.In addition, the increase of equilibrium block quality, also can increase crankshaft eccentric inertial force, strengthens inertial force during compressor operation, increases bent axle abrasion, causes compressor reliability to be affected.
There is the problem that equilibrium block quality is excessive, crankshaft eccentric inertial force causes more greatly reliability to reduce in the rotary compressor in correlation technique.Inventor finds through research and a large amount of experiments, and in compressor, the eccentric mass of eccentric movement component is excessive to cause the excessive reason of equilibrium block quality to be.Therefore, inventor finds, the inertial force of eccentric mass to reduction bent axle reducing eccentric movement component, the quality reducing equilibrium block have significant effect.
For this reason, the present invention aims to provide a kind of piston of rotary compressor, uses the piston of this rotary compressor, can be beneficial to the weight reducing equilibrium block in rotary compressor.
Another object of the present invention is to provide a kind of rotary compressor with the piston of above-mentioned rotary compressor.
Another object of the present invention is to provide a kind of multistage compressor with the piston of above-mentioned rotary compressor.
According to the piston of the rotary compressor of the embodiment of the present invention, described piston is formed in one part, and described piston is provided with center hole, and the internal face of described center hole is provided with groove, and the both sides of described groove are opened with two end surfaces of described piston respectively.
According to the piston of the rotary compressor of the embodiment of the present invention, by piston is set to one-body molded, be convenient to processing and assembling, on the internal face of piston center hole, be provided with the groove that upper and lower both sides are closed simultaneously, the weight of piston can be alleviated, thus reduce the rotating eccentricity inertial force of the rotary compressor using this piston, be convenient to the weight reducing compressor inner equilibrium block, reduce vibration of compressor and noise simultaneously, improve the reliability of compressor long time running, also can effectively prevent the coolant leakage in exhaust port and the degradation problem that causes.
In certain embodiments, described groove is arranged around described center hole.
In further embodiments, described groove is arranged along the axis of described center hole.
Particularly, described groove comprises at least one sub-groove.
More specifically, described groove comprises the sub-groove of the annular of multiple axially spaced-apart along described center hole arrangement.
In certain embodiments, the end face of described groove is equal to the distance of the lower end surface of described piston with the bottom surface of described groove to the distance of the upper-end surface of described piston.Thus ensure piston structure even intensity, not yielding.
Advantageously, the thickness of the piston wall of the described piston of corresponding described groove part is less than the degree of depth of described groove.Thus, under the prerequisite of seal vents, the weight of piston can be reduced further at guarantee piston, reach the object of balance eccentric mass.
Preferably, the axial height of described piston is H, and the axial height of described groove is L, and described H and L meets: 0.2≤L/H≤0.8.Thus, the center bore inner wall face of piston and fully contacting of crankshaft eccentric portion periphery wall can be ensured, ensure the eccentric balance successful arranged eccentric part of groove simultaneously.
According to the rotary compressor of the embodiment of the present invention, comprising: bent axle, described bent axle comprises main shaft part and is formed in the eccentric part in described main shaft part; Piston, described piston is the piston of rotary compressor according to the above embodiment of the present invention, and described eccentric part is engaged in the described center hole of described piston.
According to the multistage compressor of the embodiment of the present invention, comprising: bent axle, described bent axle comprises main shaft part and is formed in the multiple eccentric parts in described main shaft part; Multiple piston, described multiple piston is respectively the piston of rotary compressor according to the above embodiment of the present invention, and described multiple eccentric part is engaged in the described center hole of described multiple piston correspondingly.
Additional aspect of the present invention and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Summary of the invention
The application makes the discovery of the following fact and problem and understanding based on inventor:
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage will become obvious and easy understand from accompanying drawing below combining to the description of embodiment, wherein:
Fig. 1 is the structural representation of existing rotary compressor;
Fig. 2 is the plan structure schematic diagram of piston according to an embodiment of the invention;
Fig. 3 is the cross-sectional view of piston according to an embodiment of the invention;
Fig. 4 is the cross-sectional view of piston in accordance with another embodiment of the present invention.
Reference character:
100: rotary compressor;
1: exhaust manifolds; 2: upper shell; 3: main casing; 4: stator; 5: rotor; 6: bent axle; 61: main shaft part; 62: eccentric part; 7: upper bearing (metal); 8: cylinder; 9: lower bearing; 10: lower shell body; 11: slide plate; 12: piston; 13: equilibrium block; 14: liquid-storage container;
A: housing; B: motor; C: compressing mechanism; V: receiving cavity;
S1: the upper-end surface of piston; S2: the lower end surface of piston; S3: the internal face of piston center hole; H: the axial height of piston; L: the axial height of groove; M1: the thickness of the piston wall of the piston of respective slot part; M2: the degree of depth of groove;
120: center hole; 124: groove; 1241: sub-groove; 1242: stiffening rib.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.
In describing the invention, it will be appreciated that, term " " center ", " vertically ", " length ", " width ", " thickness ", " on ", D score, " vertically ", " level ", " top ", " end ", " interior ", " outward ", " axis ", " radial direction ", orientation or the position relationship of the instruction such as " circumference " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limitation of the present invention can not be interpreted as.
In describing the invention, except as otherwise noted, the implication of " multiple " is two or more.
In describing the invention, unless otherwise clearly defined and limited, term " is connected ", " connection ", " fixing " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or integral; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals or the interaction relationship of two elements.For the ordinary skill in the art, concrete condition above-mentioned term concrete meaning in the present invention can be understood.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature it " on " or D score can comprise the first and second features and directly contact, also can comprise the first and second features and not be directly contact but by the other characterisation contact between them.And, fisrt feature second feature " on ", " top " and " above " comprise fisrt feature directly over second feature and oblique upper, or only represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " below " and " below " comprise fisrt feature immediately below second feature and tiltedly below, or only represent that fisrt feature level height is less than second feature.
Below with reference to Fig. 1-Fig. 4, the piston 12 according to the rotary compressor of the embodiment of the present invention is described.
Particularly, as shown in Figure 1, rotary compressor 100100 comprises: housing A, motor B and compressing mechanism C.Housing A is seal container, limits receiving cavity V in housing A, and motor B and compressing mechanism C is all located in receiving cavity V.In the example illustrated in figure 1, housing A comprises main casing 3, upper shell 2 and lower shell body 10, and main casing 3 is formed as the tubular of upper and lower both ends open, and upper shell 2 and lower shell body 10 are located at the two ends up and down of main casing 3 respectively.Rotary compressor 100100 also comprises exhaust manifolds 1, and exhaust manifolds 1 to be located on housing A and to be communicated with receiving cavity V, and in the example of fig. 1, exhaust manifolds 1 are connected on upper shell 2.
As shown in Figure 1, motor B comprises stator 4 and coordinates the rotor 5 rotated with stator 4.In the example of fig. 1, motor B is inner rotor motor, is namely enclosed within rotor 5 outside stator 4.
As shown in Figure 1, compressing mechanism C comprises bent axle 6, cylinder assembly, lower bearing 9, upper bearing (metal) 7, piston 12 and slide plate 11 etc., and cylinder assembly can comprise one or more cylinder 8.Wherein, bent axle 6 runs through cylinder assembly and is enclosed within outside rotor 5 on bent axle 6, bent axle 6 be fixedly connected with rotor 5 with rotor 5 synchronous rotary.Upper bearing (metal) 7 and lower bearing 9 are located at the two ends up and down of cylinder assembly respectively, upper bearing (metal) 7 and/or lower bearing 9 are provided with the exhaust port (scheming not shown) being communicated with cylinder interior space, and bent axle 6 coordinates to be located at rotationally in housing A with upper bearing (metal) 7 and lower bearing 9 respectively.Be located in cylinder 8 to piston 12 eccentric rotary, bent axle 6 is connected with piston 12 with driven plunger 12 eccentric rotary, and bent axle 6 drive piston 12 rotate and compression cylinder 8 in refrigerant.Rotary compressor 100100 also provides refrigerant to be compressed by liquid-storage container 14, and liquid-storage container 14 is connected with cylinder 8.Cylinder interior space is divided into hyperbaric chamber and low-pressure cavity by slide plate 11, compression refrigerant in piston 12 rotation process, and the pressure in hyperbaric chamber is raised, and when pressure is increased to the pressure outside slightly larger than compressing mechanism C, namely pressurized gas refrigerant discharges by exhaust port.
Be eccentric system due to bent axle 6 and by the piston 12 of bent axle 6 driven rotary, larger vibration can be caused during rotation, therefore in the design, usually also need at the two ends of rotor 5 configuration equilibrium block 13 to offset mass eccentricity.
According to the piston 12 of the rotary compressor of the embodiment of the present invention, as shown in figs 2-4, piston 12 is formed in one part, and piston 12 is provided with center hole 120.As shown in Figure 1, the eccentric part 62 that bent axle 6 comprises main shaft part 61 and is formed in main shaft part 61, bent axle 6 coordinates with the center hole 120 of piston 12.
With reference to Fig. 3 and Fig. 4, the internal face S3 of center hole 120 is provided with groove 124, and the both sides of groove 124 are spaced apart with two end faces (S1, S2) of piston 12 respectively.By arranging groove 124 on the internal face S3 of center hole 120, the weight of piston 12 is alleviated greatly, thus the rotating eccentricity inertial force of the rotary compressor 100 using this piston 12 can be reduced.The minimizing of rotating eccentricity inertial force, can be convenient to the weight reducing compressor inner equilibrium block 11, reduce vibration of compressor and noise simultaneously, improve the reliability of compressor long time running.
Wherein, the both sides of groove 124 are spaced apart with two end faces (S1, S2) of piston 12 respectively, that is, the both sides up and down of groove 124 are closed end, i.e. one side closed at the upper-end surface S1 towards piston 12 of groove 124, groove 124 is also closed in the side of the lower end surface S2 towards piston 12, and the design of groove 124 can ensure that piston 12 at least can cover exhaust port completely in compressor operation process, prevents refrigerant from being let out by exhaust port.Namely exhaust pore size is not being changed, when not changing cylinder 8, upper bearing (metal) 7, the structure of lower bearing 9 and size, can not only ensure that piston 12 centrifugal force is effectively reduced in rotation process, also can effectively prevent the coolant leakage in exhaust port and the hydraulic performance decline caused simultaneously.In addition, internal face S3 and bent axle 6 area of contact of center hole 120 are less, and frictional loss is reduced, and finally serve and reduce compressor power consumption and the object reducing vibration of compressor.
It should be noted that, a kind of compressor rolling rotor is it is also proposed in material disclosed in prior art, this rolling rotor comprises the first rolling rotor and the second rolling rotor that stack setting, first rolling rotor is arranged the first loss of weight space, second rolling rotor is arranged the second loss of weight space, the setting in loss of weight space for changing the relative velocity of compressor rolling rotor and slide plate, thus improves the abrasion condition between slide plate and rolling rotor.Compared with the rolling rotor of this compressor, in the embodiment of the present invention, piston 12 integration is made, difficulty of processing and the manufacture cost of piston 12 can be reduced, also the assembling of piston 12 and miscellaneous part is facilitated, be convenient to control piston 12 and the assembly precision of bent axle 6, upper bearing (metal) 7, lower bearing 9 and slide plate 11 etc., ensure the tightness of cylinder 8.
According to the piston 12 of the rotary compressor of the embodiment of the present invention, by piston 12 is set to one-body molded, be convenient to processing and assembling, on the internal face S3 of piston center hole 120, be provided with the groove 124 that upper and lower both sides are closed simultaneously, the weight of piston 12 can be alleviated, thus reduce the rotating eccentricity inertial force of the rotary compressor 100 using this piston 12, be convenient to the weight reducing compressor inner equilibrium block 11, reduce vibration of compressor and noise simultaneously, improve the reliability of compressor long time running, also can effectively prevent the coolant leakage in exhaust port and the degradation problem caused.
Here, groove 124 arrange shape, arrangement position can be unrestricted, such as, groove 124 can be arranged around center hole 120, groove 124 also can centrally hole 120 axis arrange, groove 124 also can be slotted along other directions.The vertical cross-section of groove 124 is square, arc or semicircle, and the vertical cross-section of groove 124 also can be formed as other shapes, as trapezoidal, irregularly shaped etc.
Below with reference to Fig. 3-Fig. 4, two specific embodiments are described, so that understand the concrete structure of the piston 12 of the embodiment of the present invention in detail.Wherein, in different embodiments, identical label shows identical parts or has the parts of identical function.
Embodiment one
In this embodiment, as shown in Figure 3, the groove 124 in piston 12 comprises a sub-groove 1241.
Particularly, sub-groove 1241 is arranged around center hole 120, and sub-groove 1241 is annular, and namely the internal face S3 of center hole 120 is provided with 1 sub-groove 1241 along whole circumference, decrease the weight of piston 12 to greatest extent, reach the object reducing eccentric part 62 inertial force.
Wherein, when the axial height L of groove 124 is excessive, can cannot ensure that the center bore inner wall face S3 of piston 12 fully contacts with the eccentric part periphery wall of bent axle 6, and when the axial width L of groove 124 is too small, the eccentric balance action effect of groove 124 pairs of eccentric parts is not obvious, for this reason, need to retrain to the axial height L of groove 124.In embodiment one, the axial height of piston 12 is H, and the axial height of groove 124 is that L, H and L meet: 0.2≤L/H≤0.8.
In embodiment one, as shown in Figure 3, the end face of groove 124 is equal to the distance of the lower end surface S2 of piston 12 with the bottom surface of groove 124 to the distance of the upper-end surface S1 of piston 12, thus ensures that piston 12 structural strength is even, not yielding.
Advantageously, as shown in Figure 3, the thickness m1 of the piston wall of the piston 12 of respective slot 124 part is less than the degree of depth m2 of groove 124.Thus, under the prerequisite of seal vents, the weight of piston 12 can be reduced further at guarantee piston 12, reach the object of balance eccentric mass.
Embodiment two
In this embodiment, as shown in Figure 4, the structure of piston 12 is substantially identical with piston 12 structure in enforcement one, and this repeats no more.
Difference is, in embodiment two, the groove 124 in piston 12 comprises multiple sub-groove 1241, and namely the quantity of sub-groove 1241 is more than 2 or 2.
Particularly, groove 124 comprises the sub-groove 1241 of the annular of the axially spaced-apart arrangement in multiple centrally hole 120.Like this, the part between adjacent two sub-grooves 1241 forms stiffening rib 1242, thus under the prerequisite alleviating piston 12 weight, increases the structural strength of piston 12, ensures that piston 12 is not yielding.
When group groove 1241 is multiple, the axial height L of groove 124 is the axial height sum of multiple sub-groove 1241.Wherein, the axial height of the n-th sub-groove 1241 is Ln, and the axial height sum of multiple sub-groove 1241 is: (L1+L2+L3+Ln+ ...).The axial height of piston 12 is H, for ensureing that the center bore inner wall face S3 of piston 12 fully contacts with the eccentric part periphery wall of bent axle 6, ensure the eccentric balance successful arranged eccentric part of groove 124, demand fulfillment relation: 0.2≤(L1+L2+L3+Ln+ simultaneously ... )/H≤0.8.
According to the rotary compressor 100 of the embodiment of the present invention, comprise: bent axle 6 and piston, the eccentric part 62 that bent axle 6 comprises main shaft part 61 and is formed in main shaft part 61, piston is the piston 12 of rotary compressor according to the above embodiment of the present invention, and eccentric part 62 is engaged in the center hole 120 of piston 12.
Owing to being provided with above-mentioned piston 12, namely the groove 124 that upper and lower both sides are closed is set on the internal face S3 of piston center hole 120, the rotating eccentricity inertial force of rotary compressor 100 can be reduced, be convenient to the weight reducing equilibrium block 11, reduce vibration of compressor and noise simultaneously, improve the reliability of compressor long time running, also can effectively prevent the coolant leakage in exhaust port and the degradation problem that causes.
According to the multistage compressor of the embodiment of the present invention, comprising: bent axle 6 and multiple piston.Wherein, multiple eccentric parts 62 that bent axle 6 comprises main shaft part 61 and is formed in main shaft part 61, multiple piston is respectively the piston 12 of rotary compressor according to the above embodiment of the present invention, and multiple eccentric part 62 is engaged in the center hole 120 of multiple piston 12 correspondingly.
Owing to being provided with above-mentioned piston 12, namely the groove 124 that upper and lower both sides are closed is set on the center bore inner wall face S3 of each piston, the rotating eccentricity inertial force of multistage compressor can be reduced, be convenient to the weight reducing equilibrium block 11, reduce vibration of compressor and noise simultaneously, improve the reliability of compressor long time running, also can effectively prevent the coolant leakage in exhaust port and the hydraulic performance decline that causes.
In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Although illustrate and describe embodiments of the invention, those having ordinary skill in the art will appreciate that: can carry out multiple change, amendment, replacement and modification to these embodiments when not departing from principle of the present invention and aim, scope of the present invention is by claim and equivalents thereof.
Claims (10)
1. a piston for rotary compressor, is characterized in that, described piston is formed in one part, and described piston is provided with center hole, and the internal face of described center hole is provided with groove, and the both sides of described groove are opened with two end surfaces of described piston respectively.
2. the piston of rotary compressor according to claim 1, is characterized in that, described groove is arranged around described center hole.
3. the piston of rotary compressor according to claim 1, is characterized in that, described groove is arranged along the axis of described center hole.
4. the piston of rotary compressor according to claim 1, is characterized in that, described groove comprises at least one sub-groove.
5. the piston of rotary compressor according to claim 4, is characterized in that, described groove comprises the sub-groove of the annular of multiple axially spaced-apart along described center hole arrangement.
6. the piston of rotary compressor according to claim 1, is characterized in that, the end face of described groove is equal to the distance of the lower end surface of described piston with the bottom surface of described groove to the distance of the upper-end surface of described piston.
7. the piston of rotary compressor according to claim 1, is characterized in that, the thickness of the piston wall of the described piston of corresponding described groove part is less than the degree of depth of described groove.
8. the piston of the rotary compressor according to any one of claim 1-7, is characterized in that, the axial height of described piston is H, and the axial height of described groove is L, and described H and L meets: 0.2≤L/H≤0.8.
9. a rotary compressor, is characterized in that, comprising:
Bent axle, described bent axle comprises main shaft part and is formed in the eccentric part in described main shaft part;
Piston, described piston is engaged in the described center hole of described piston for the piston of the rotary compressor according to any one of claim 1-8, described eccentric part.
10. a multistage compressor, is characterized in that, comprising:
Bent axle, described bent axle comprises main shaft part and is formed in the multiple eccentric parts in described main shaft part;
Multiple piston, described multiple piston is respectively the piston of the rotary compressor according to any one of claim 1-8, and described multiple eccentric part is engaged in the described center hole of described multiple piston correspondingly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510334580.2A CN104929940A (en) | 2015-06-16 | 2015-06-16 | Piston of rotary compressor and rotary compressor with same and multistage compressor with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510334580.2A CN104929940A (en) | 2015-06-16 | 2015-06-16 | Piston of rotary compressor and rotary compressor with same and multistage compressor with same |
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| CN104929940A true CN104929940A (en) | 2015-09-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510334580.2A Pending CN104929940A (en) | 2015-06-16 | 2015-06-16 | Piston of rotary compressor and rotary compressor with same and multistage compressor with same |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105201783A (en) * | 2015-10-22 | 2015-12-30 | 安徽美芝精密制造有限公司 | Compressor, compressor piston and preparation method of compressor piston |
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| JPS63113785U (en) * | 1987-01-20 | 1988-07-22 | ||
| CN201187450Y (en) * | 2008-03-11 | 2009-01-28 | 上海日立电器有限公司 | Piston structure with oil groove for rolling rotor type compressor |
| WO2009093701A1 (en) * | 2008-01-23 | 2009-07-30 | Daikin Industries, Ltd. | Compressor |
| CN102192149A (en) * | 2010-03-10 | 2011-09-21 | 广东美芝制冷设备有限公司 | Rotary compressor |
| CN204729305U (en) * | 2015-06-16 | 2015-10-28 | 广东美芝制冷设备有限公司 | The piston of rotary compressor and there is its rotary compressor, multistage compressor |
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2015
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS63113785U (en) * | 1987-01-20 | 1988-07-22 | ||
| WO2009093701A1 (en) * | 2008-01-23 | 2009-07-30 | Daikin Industries, Ltd. | Compressor |
| CN201187450Y (en) * | 2008-03-11 | 2009-01-28 | 上海日立电器有限公司 | Piston structure with oil groove for rolling rotor type compressor |
| CN102192149A (en) * | 2010-03-10 | 2011-09-21 | 广东美芝制冷设备有限公司 | Rotary compressor |
| CN204729305U (en) * | 2015-06-16 | 2015-10-28 | 广东美芝制冷设备有限公司 | The piston of rotary compressor and there is its rotary compressor, multistage compressor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105201783A (en) * | 2015-10-22 | 2015-12-30 | 安徽美芝精密制造有限公司 | Compressor, compressor piston and preparation method of compressor piston |
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Application publication date: 20150923 |