CN105201783A - Compressor, compressor piston and preparation method of compressor piston - Google Patents
Compressor, compressor piston and preparation method of compressor piston Download PDFInfo
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- CN105201783A CN105201783A CN201510690328.5A CN201510690328A CN105201783A CN 105201783 A CN105201783 A CN 105201783A CN 201510690328 A CN201510690328 A CN 201510690328A CN 105201783 A CN105201783 A CN 105201783A
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Abstract
The invention discloses a compressor, a compressor piston and a preparation method of the compressor piston. The compressor piston comprises a main body, wherein the main body is provided with a channel which runs through the main body in the axial direction; a hollow cavity is defined in the main body and extends in the axial direction of the main body. According to the compressor piston, as the follow cavity is formed in the piston, the mass of the piston can be reduced. Compared with a compressor in the related art, the compressor provided by the invention has the advantage that as the piston is used in the compressor, the weight of a balance block can be reduced, and accordingly, the cost is lowered. Moreover, the piston can reduce the power consumption and improve the energy efficiency of the compressor, and the compressor piston has the advantages of being simple and compact in structure, easy in manufacturing process and low in cost.
Description
Technical field
The present invention relates to Compressor Technology field, more specifically, relate to the piston and preparation method thereof of a kind of compressor, compressor.
Background technique
The piston of the compressor in correlation technique, generally adopts solid casting, than great, the eccentric mass of bent axle can be increased like this, therefore, need the equilibrium block being furnished with certain mass on rotor, thus reach the object of balancing mass, but the cost of compressor can be improved like this.Further, piston can produce useless power consumption in operation process, affects the efficiency of compressor.
Summary of the invention
The present invention is intended to solve one of technical problem in correlation technique at least to a certain extent.For this reason, the present invention proposes a kind of piston of compressor, and the quality of the piston of this compressor is little, cost is low, manufactures simple.
The present invention also proposes a kind of preparation method with the compressor of the piston of above-mentioned compressor and the piston of compressor.
The piston of the compressor of embodiment according to a first aspect of the present invention, comprising: body, and described body has along its axially through passage, is limited with the hollow cavity along its axially extended hollow in described body.
According to the piston of the compressor of the embodiment of the present invention, by arranging the hollow cavity of hollow in piston, the quality of this piston can be reduced, compared with the compressor in correlation technique, this piston, with within the compressor, can reduce the weight of equilibrium block, thus reduce costs.Moreover this piston can reduce the power consumption of compressor, improve the efficiency of compressor, the structure of the piston of this compressor is simple, compact, and manufacturing process is easy, and cost is low.
In addition, according to the piston of the compressor of the embodiment of the present invention, following additional technical characteristics can also be had:
According to one embodiment of present invention, described body comprises: the first pipeline section, and described first pipeline section has along its axially through described passage; Second pipeline section, described second pipeline section and described first pipeline section are coaxially arranged and described second pipeline section is positioned at the periphery of described first pipeline section, spaced apart formation gap between the inner circle wall of described second pipeline section and the periphery wall of described first pipeline section; Closed section, described closed section is connected with the axial two ends of described first pipeline section and described second pipeline section respectively and forms described hollow cavity with the gap closed between described first pipeline section and the second pipeline section.
According to one embodiment of present invention, described closed section comprises two, two described closed sections are formed as annular respectively, and the inner ring of each described closed section is connected with one end of described first pipeline section respectively, and the outer ring of each described closed section is connected to corresponding one end of described second pipeline section respectively.
According to one embodiment of present invention, described closed section and described second pipeline section are integrally formed, and described closed section and described first pipeline section are weldingly connected.
According to one embodiment of present invention, the axial dimension of described first pipeline section is less than the axial dimension of described second pipeline section, the inner ring of the described closed section axis be provided with along described second pipeline section slopes inwardly the rake extended, and described rake is connected with described first pipeline section and and forms solder slot between described first pipeline section.
According to one embodiment of present invention, described closed section and described first pipeline section are integrally formed, and described closed section and described second pipeline section are weldingly connected.
According to one embodiment of present invention, described first pipeline section is equal with the axial dimension of the second pipeline section, and described closed section is concordant with the end face of described second pipeline section with described first pipeline section.
The compressor of embodiment according to a second aspect of the present invention, comprises the piston of the compressor according to above-described embodiment.
The preparation method of the piston of the compressor of embodiment according to a third aspect of the present invention, comprises the following steps:
S1, I shape blank steel pipe sawing sheet being become required size and straight tube blank;
S2, described I shape blank is processed into H-shaped material;
S3, described straight tube blank be set on described H-shaped material and the two ends of described H-shaped material and described straight tube blank are welded to connect, obtaining semi-finished product piston;
S4, described semi-finished product piston is carried out fine finishing to reach design size;
S5, described semi-finished product piston is carried out surface treatment, obtain piston.
According to one embodiment of present invention, the carbon content in the material of described steel pipe is less than 0.4%, and described surface-treated method is chemical nickel plating, nitriding, metal heat treatmet.
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.
Accompanying drawing explanation
Fig. 1 is the structural representation of the piston of compressor according to an embodiment of the invention;
Fig. 2 is the plan view of the piston of the compressor shown in Fig. 1;
Fig. 3 is the second pipeline section of the piston shown in Fig. 1 and the erection drawing of closed section;
Fig. 4 is the plan view of the structure shown in Fig. 3;
Fig. 5 is the structural representation of the first pipeline section of the piston shown in Fig. 1;
Fig. 6 is the plan view of the first pipeline section of the piston shown in Fig. 5;
Fig. 7 is the structural representation of the piston of compressor according to another embodiment of the present invention;
Fig. 8 is the plan view of the piston of the compressor shown in Fig. 7;
Fig. 9 is the first pipeline section of the piston shown in Fig. 7 and the erection drawing of closed section;
Figure 10 is the plan view of the structure shown in Fig. 9;
Figure 11 is the structural representation of the second pipeline section of the piston shown in Fig. 7;
Figure 12 is the plan view of the second pipeline section of the piston shown in Figure 11;
Figure 13 is the flow chart of the preparation method of the piston of compressor according to the embodiment of the present invention.
Reference character:
Piston 100 (100a, 100b);
Path 10 1; Hollow cavity 102;
First pipeline section 11; Groove 111; Second pipeline section 12; Closed section 13; Rake 131.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings.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.
The piston 100 of the compressor of embodiment is according to a first aspect of the present invention specifically described below in conjunction with accompanying drawing 1 to Figure 12.
Piston 100 according to the compressor of the embodiment of the present invention comprises body, and body has along its axially through path 10 1, is limited with the hollow cavity 102 along its axially extended hollow in body.
In other words, the piston 100 of this compressor is formed as vertically the Cylindrical object that (above-below direction as shown in Figure 1 and Figure 7) extends, wherein, the middle part of piston 100 has along its axially through path 10 1, this path 10 1 may be used for the bent axle installing compressor, namely bent axle can be set on the eccentric shaft of bent axle to make piston 100 through the path 10 1 of piston 100, and the hollow cavity 102 be limited with in the sidewall of this piston 100 along its axially extended sealing, preferably, this hollow cavity 102 is formed as annular to make the quality balance of this piston 100, the quality of piston 100 can be reduced so widely.
Thus, according to the piston 100 of the compressor of the embodiment of the present invention, by arranging the hollow cavity 102 of hollow in piston 100, the quality of this piston 100 can be reduced, compared with the compressor in correlation technique, this piston 100, with within the compressor, can reduce the weight of equilibrium block, thus reduce costs.Moreover this piston 100 can reduce the power consumption of compressor, improve the efficiency of compressor, the structure of the piston 100 of this compressor is simple, compact, and manufacturing process is easy, and cost is low.
Wherein, according to one embodiment of present invention, body comprises the first pipeline section 11, second pipeline section 12 and closed section 13.Specifically, first pipeline section 11 has along its axially through path 10 1, second pipeline section 12 and the first pipeline section 11 be coaxial to be arranged and the second pipeline section 12 is positioned at the periphery of the first pipeline section 11, spaced apart formation gap between the inner circle wall of the second pipeline section 12 and the periphery wall of the first pipeline section 11, closed section 13 is connected with the axial two ends of the first pipeline section 11 and the second pipeline section 12 respectively and forms hollow cavity 102 with the gap closed between the first pipeline section 11 and the second pipeline section 12.
That is, the body of this piston 100 is primarily of the first pipeline section 11, second pipeline section 12 and closed section 13 form, wherein the first pipeline section 11 and the second pipeline section 12 are all formed as vertically the pipe that (above-below direction as shown in Figure 1 and Figure 7) extends, and the second pipeline section 12 is set in the outside of the first pipeline section 11 and coaxially arranges with the first pipeline section 11, the outer side wall of the first pipeline section 11 and the madial wall of the second pipeline section 12 arranged spaced apart, closed section 13 comprises two, two closed sections 13 are located at the top and bottom of the first pipeline section 11 respectively, and the inner being positioned at the closed section 13 of top is connected with the upper end of the first pipeline section 11, the outer end of this closed section 13 is connected with the upper end of the second pipeline section 12, and the inner being positioned at the closed section 13 of below is connected with the lower end of the first pipeline section 11, the outer end of this closed section 13 is connected with the lower end of the second pipeline section 12, thus make closed section 13, the hollow cavity 102 of hollow is limited between first pipeline section 11 and the second pipeline section 12.
Thus, structure simple, each parts connection of the piston 100 of this compressor is compact, manufacture is simple, both the quality of this piston 100 can have been reduced, this piston 100 is used within the compressor, the weight of equilibrium block can be reduced, thus reduce costs, the power consumption of compressor can be reduced again, improve the efficiency of compressor.
Preferably, two closed sections 13 are formed as annular respectively, and the inner ring of each closed section 13 is connected with one end of the first pipeline section 11 respectively, and the outer ring of each closed section 13 is connected to corresponding one end of the second pipeline section 12 respectively.
Particularly, two closed sections 13 are formed as the ring part arranged in the horizontal direction, and the inner ring being positioned at the closed section 13 of top is connected with the upper end of the first pipeline section 11, the outer ring being positioned at the closed section 13 of below is connected with the upper end of the second pipeline section 12, and the inner ring being positioned at the closed section 13 of below is connected with the lower end of the first pipeline section 11, the outer ring being positioned at the closed section 13 of below is connected with the lower end of the second pipeline section 12, makes the closed section 13 of annular close the top and bottom in the gap between the first pipeline section 11 and the second pipeline section 12.
As shown in Figures 1 to 7, in embodiments more of the present invention, closed section 13 and the second pipeline section 12 are integrally formed, and closed section 13 and the first pipeline section 11 are weldingly connected.I.e. two closed sections 13 extending radially inwardly respectively along the second pipeline section 12, and the inner ring of two closed sections 13 is weldingly connected with the top and bottom of the first pipeline section 11 respectively.Thus, the structure be integrally formed not only can ensure the properity stability of piston 100a, and facilitate shaping, manufacture simple, and eliminate unnecessary assembly parts and connect operation, substantially increase the efficiency of assembling of piston 100a, ensure the connection reliability of piston 100a, moreover, bulk strength and the stability of the structure be integrally formed are higher, and assemble more convenient, the life-span is longer.
Wherein, the axial dimension of the first pipeline section 11 is less than the axial dimension of the second pipeline section 12, the inner ring of closed section 13 axis (above-below direction as shown in Figure 1) be provided with along the second pipeline section 12 slopes inwardly the rake 131 extended, and rake 131 is connected with the first pipeline section 11 and and forms solder slot between the first pipeline section 11.
Particularly, as shown in Figure 1, first pipeline section 11 is located in the second pipeline section 12, and the upper end of the first pipeline section 11 in the horizontal direction, lower than the upper end of the second pipeline section 12, the lower end of the first pipeline section 11 in the horizontal direction, higher than the lower end of the second pipeline section 12, namely the upper-end surface of the second pipeline section 12 and lower end surface protrude from upper-end surface and the lower end surface of the first pipeline section 11 correspondence.
And the inner ring being positioned at the closed section 13 of top is provided with along the second pipeline section 12 radially-inwardly, along the rake 131 that axially inside (as shown in Figure 1 in downward direction) of the second pipeline section 12 extends, the upper end that this rake 131 is corresponding with the first pipeline section 11 is connected, the inner ring being positioned at the closed section 13 of below is provided with along the second pipeline section 12 radially-inwardly, along the rake 131 that axially inside (upward direction as shown in Figure 1) of the second pipeline section 12 extends, the lower end that this rake 131 is corresponding with the first pipeline section 11 is connected, the top and bottom that wherein two rakes 131 are corresponding with the first pipeline section 11 limit solder slot respectively, solder is full of closed section 13 and the first pipeline section 11 to be weldingly connected in solder slot.
Thus, be provided with the hollow cavity 102 of hollow, can reduce the quality of this piston 100a in this piston 100a, compared with the compressor in correlation technique, this piston 100a, with within the compressor, can reduce the weight of equilibrium block, thus reduce costs.Moreover this piston 100a can reduce the power consumption of compressor, improve the efficiency of compressor.
As shown in Fig. 8 to Figure 12, in other embodiments of the present invention, closed section 13 and the first pipeline section 11 are integrally formed, and closed section 13 and the second pipeline section 12 are weldingly connected.In other words, two closed sections 13 respectively along the first pipeline section 11 extend radially outwardly make to limit the groove 111 of opening towards radial direction between the first pipeline section 11 and two closed sections 13, and the outer ring of two closed sections 13 is weldingly connected with the top and bottom of the second pipeline section 12 with the opening of closed pockets 111 respectively.
Thus, the structure be integrally formed not only can ensure the properity stability of piston 100b, and facilitate shaping, manufacture simple, and eliminate unnecessary assembly parts and connect operation, substantially increase the efficiency of assembling of piston 100b, ensure the connection reliability of piston 100b, moreover, bulk strength and the stability of the structure be integrally formed are higher, and assemble more convenient, the life-span is longer.
Preferably, the first pipeline section 11 is equal with the axial dimension of the second pipeline section 12, and closed section 13 is concordant with the end face of the second pipeline section 12 with the first pipeline section 11.Particularly, as shown in Figure 7, and the outer end of closed section 13 and the upper end of the second pipeline section 12 that are positioned at top are weldingly connected, and be positioned at the outer end of closed section 13 of below and the lower end of the second pipeline section 12 is weldingly connected, thus make the opening of the sidewall closed pockets 111 of the second pipeline section 12, limit the hollow cavity 102 of hollow.
Thus, by arranging the hollow cavity 102 of hollow in piston 100b, can reduce the quality of this piston 100b, compared with the compressor in correlation technique, this piston 100b, with within the compressor, can reduce the weight of equilibrium block, thus reduce costs.Moreover this piston 100b can reduce the power consumption of compressor, improve the efficiency of compressor.
The compressor of embodiment according to a second aspect of the present invention, comprises the piston 100 according to the compressor of above-described embodiment.Because the piston 100 of the compressor according to the embodiment of the present invention has above-mentioned technique effect, therefore, the compressor according to the embodiment of the present application also has above-mentioned technique effect, namely the structure of this compressor is simple, compact, and manufacture simple, cost is low, quality is light, and reliability is high, low in energy consumption, efficiency is high.
Below with reference to the accompanying drawings 1 to Figure 13 specifically describes the preparation method of the piston 100 of the compressor of embodiment according to a third aspect of the present invention.
According to the preparation method of the piston 100 of the compressor of the embodiment of the present invention, comprise the following steps:
S1, I shape blank steel pipe sawing sheet being become required size and straight tube blank;
S2, I shape blank is processed into H-shaped material;
S3, straight tube blank be set on H-shaped material and the two ends of H-shaped material and straight tube blank are welded to connect, obtaining semi-finished product piston;
S4, semi-finished product piston is carried out fine finishing to reach design size;
S5, semi-finished product piston is carried out surface treatment, obtain piston 100.
Particularly, as shown in Figures 1 to 6, in the present embodiment, first be that the steel pipe sawing sheet of 2mm-5mm becomes the I shape blank of required size to facilitate the processing of second pipeline section 12 with closed section 13 by thickness, steel pipe sawing sheet become the straight tube blank of required size (structural member as shown in Figure 5) to facilitate the processing of the first pipeline section 11; Then I shape blank is processed into H-shaped material (structural member as shown in Figure 3), makes the straight length of I shape blank toward the outer side; Again straight tube blank is set in the inner side of H-shaped material, and the top and bottom of the inner ring of H-shaped material with straight tube blank are welded, obtain semi-finished product piston; Finally semi-finished product piston is carried out fine finishing to reach design size, and carry out surface treatment, obtain piston 100a.
As shown in Fig. 7 to Figure 12, in the present embodiment, first be that 2mm-5mm steel pipe sawing sheet becomes the I shape blank of required size to facilitate the processing of first pipeline section 11 with closed section 13 by thickness, steel pipe sawing sheet become the straight tube blank of required size (structural member as shown in figure 11) to facilitate the processing of the second pipeline section 12; Then I shape blank is processed into H-shaped material (structural member as shown in Figure 9), makes the straight length of I shape blank towards inner side; Again straight tube blank is set in the outside of H-shaped material, and the outer ring of H-shaped material and straight tube blank are welded to connect, obtain semi-finished product piston; Finally semi-finished product piston is carried out fine finishing to reach design size, and carry out surface treatment, obtain piston 100b.
Thus, according to the preparation method of the piston 100 of the compressor of the embodiment of the present invention, manufacture process is simple, the piston 100 obtained by this preparation method, lighter weight, compared with the compressor in correlation technique, this piston 100 is used within the compressor, the weight of equilibrium block can be reduced, thus reduce costs.Moreover this piston 100 can reduce the power consumption of compressor, improve the efficiency of compressor.
Wherein, the carbon content in the material of steel pipe is less than 0.4%, and surface-treated method is chemical nickel plating, nitriding, metal heat treatmet.Preferably, the material of the steel pipe that this piston 100 is used is carbon steel, stainless steel or the alloyed steel that carbon content is less than 0.25%, and the steel pipe obtained by such material, in welding process, need not adopt special technological measure, welding easily, excellent weldability.
According to the compressor of the embodiment of the present invention other form and operation be all known for those of ordinary skills, be not described in detail here.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward ", " clockwise ", " counterclockwise ", " 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 addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristics.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise at least one this feature.In describing the invention, the implication of " multiple " is at least two, such as two, three etc., unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, the term such as term " installation ", " being 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 or each other can communication; 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, unless otherwise clear and definite restriction.For the ordinary skill in the art, above-mentioned term concrete meaning in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be that the first and second features directly contact, or the first and second features are by intermediary mediate contact.And, fisrt feature second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or only represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " below " and " below " can be fisrt feature immediately below second feature or tiltedly below, or only represent that fisrt feature level height is less than second feature.
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, to the schematic representation of above-mentioned term not must for be identical embodiment or example.And the specific features of description, structure, material or feature can combine in one or more embodiment in office or example in an appropriate manner.In addition, when not conflicting, the feature of the different embodiment described in this specification or example and different embodiment or example can carry out combining and combining by those skilled in the art.
Although illustrate and describe embodiments of the invention above, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, and those of ordinary skill in the art can change above-described embodiment within the scope of the invention, revises, replace and modification.
Claims (10)
1. a piston for compressor, is characterized in that, comprising: body, and described body has along its axially through passage, is limited with the hollow cavity along its axially extended hollow in described body.
2. the piston of compressor according to claim 1, is characterized in that, described body comprises:
First pipeline section, described first pipeline section has along its axially through described passage;
Second pipeline section, described second pipeline section and described first pipeline section are coaxially arranged and described second pipeline section is positioned at the periphery of described first pipeline section, spaced apart formation gap between the inner circle wall of described second pipeline section and the periphery wall of described first pipeline section;
Closed section, described closed section is connected with the axial two ends of described first pipeline section and described second pipeline section respectively and forms described hollow cavity with the gap closed between described first pipeline section and the second pipeline section.
3. the piston of compressor according to claim 2, it is characterized in that, described closed section comprises two, two described closed sections are formed as annular respectively, the inner ring of each described closed section is connected with one end of described first pipeline section respectively, and the outer ring of each described closed section is connected to corresponding one end of described second pipeline section respectively.
4. the piston of compressor according to claim 3, is characterized in that, described closed section and described second pipeline section are integrally formed, and described closed section and described first pipeline section are weldingly connected.
5. the piston of compressor according to claim 4, it is characterized in that, the axial dimension of described first pipeline section is less than the axial dimension of described second pipeline section, the inner ring of the described closed section axis be provided with along described second pipeline section slopes inwardly the rake extended, and described rake is connected with described first pipeline section and and forms solder slot between described first pipeline section.
6. the piston of compressor according to claim 3, is characterized in that, described closed section and described first pipeline section are integrally formed, and described closed section and described second pipeline section are weldingly connected.
7. the piston of compressor according to claim 6, is characterized in that, described first pipeline section is equal with the axial dimension of the second pipeline section, and described closed section is concordant with the end face of described second pipeline section with described first pipeline section.
8. a compressor, is characterized in that, comprises the piston of the compressor according to any one of claim 1-7.
9. a preparation method for the piston of the compressor according to any one of claim 1-7, is characterized in that, comprises the following steps:
S1, I shape blank steel pipe sawing sheet being become required size and straight tube blank;
S2, described I shape blank is processed into H-shaped material;
S3, described straight tube blank be set on described H-shaped material and the two ends of described H-shaped material and described straight tube blank are welded to connect, obtaining semi-finished product piston;
S4, described semi-finished product piston is carried out fine finishing to reach design size;
S5, described semi-finished product piston is carried out surface treatment, obtain piston.
10. the preparation method of the piston of compressor according to claim 9, is characterized in that, the carbon content in the material of described steel pipe is less than 0.4%, and described surface-treated method is chemical nickel plating, nitriding, metal heat treatmet.
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| CN201510690328.5A CN105201783B (en) | 2015-10-22 | 2015-10-22 | Compressor, piston of compressor and preparation method thereof |
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| CN105822551A (en) * | 2016-05-17 | 2016-08-03 | 广东美芝制冷设备有限公司 | Pump of compressor and compressor with pump |
| CN106194744A (en) * | 2016-08-31 | 2016-12-07 | 浙江百达精工股份有限公司 | The blank manufacture method of compressor piston and compressor piston |
| CN107420309A (en) * | 2017-08-30 | 2017-12-01 | 广东美芝制冷设备有限公司 | Rotary compressor piston and preparation method thereof |
| CN108843576A (en) * | 2018-06-19 | 2018-11-20 | 广东美芝制冷设备有限公司 | Piston, compressor and refrigeration equipment |
| CN112833016A (en) * | 2021-03-22 | 2021-05-25 | 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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| CN112833016A (en) * | 2021-03-22 | 2021-05-25 | 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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