CN205779557U - Compressor bent axle and the compressor with it - Google Patents
Compressor bent axle and the compressor with it Download PDFInfo
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- CN205779557U CN205779557U CN201620499322.XU CN201620499322U CN205779557U CN 205779557 U CN205779557 U CN 205779557U CN 201620499322 U CN201620499322 U CN 201620499322U CN 205779557 U CN205779557 U CN 205779557U
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- oil
- compressor
- main shaft
- bent axle
- crank arm
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Abstract
The utility model discloses a kind of compressor bent axle and have its compressor, wherein bent axle includes: eccentric shaft, defines the first oil canal in eccentric shaft；Crank arm, the first end of crank arm is connected with one end of eccentric shaft, is provided with the oblique oil duct connected with the first oil canal in crank arm；Main shaft, one end of main shaft is connected with the second end of crank arm, and one end being connected with crank arm of main shaft is provided with the circumferentially extending cannelure along main shaft, and the diapire of cannelure is provided with the oil leak hole connected with oblique oil duct.According to compressor bent axle of the present utility model, refrigerator oil can the oil leak hole from bent axle be ejected in parts thereon (such as bearing), to reach the effect of lubrication, reduce mechanical friction loss, thus be conducive to reducing the input power of compressor, improve the work efficiency of compressor.The simple in construction of this compressor bent axle, greasy property is good, and work efficiency and efficiency are high.
Description
Technical field
This utility model relates to Compressor Technology field, more particularly, to a kind of compressor bent axle and the compression with it
Machine.
Background technology
Small-sized piston formula compressor is generally applicable in the household electrical appliance such as refrigerator, air-conditioning, by accepting the power drive of motor,
Then cold-producing medium is compressed, thus realizes improving refrigerant pressure.The bent axle in compressor in correlation technique and thrust
Bearing fit, lacks therebetween lubricating oil, so that the input power that thrust bearing is easily caused compressor in the running is higher,
Reduce the work efficiency of compressor, make bearing be easier to that mechanical abrasion phenomenon occurs simultaneously.
Utility model content
One of technical problem that this utility model is intended to solve in correlation technique the most to a certain extent.To this end, this practicality is new
Type proposes a kind of compressor bent axle, the simple in construction of this compressor bent axle, processing, easy to manufacture, is conducive to improving pressure
The greasy property of each parts of contracting machine, thus improve the efficiency of compressor.
This utility model also proposes a kind of compressor with above-mentioned compressor bent axle.
Compressor bent axle according to this utility model first aspect, including: eccentric shaft, define first in described eccentric shaft
Oil canal；Crank arm, the first end of described crank arm is connected with one end of described eccentric shaft, is provided with and institute in described crank arm
State the oblique oil duct of the first oil canal connection；Main shaft, one end of described main shaft is connected with the second end of described crank arm, described master
One end being connected with crank arm of axle is provided with the circumferentially extending cannelure along described main shaft, the diapire of described cannelure be provided with
The oil leak hole of described oblique oil duct connection.
According to compressor bent axle of the present utility model, by arranging oil leak hole at the main shaft of bent axle adjacent to the position of crank arm,
Making bent axle operationally, refrigerator oil can the oil leak hole from bent axle be ejected in parts thereon (such as bearing),
To reach the effect of lubrication, reduce mechanical friction loss, thus be conducive to reducing the input power of compressor, improve compressor
Work efficiency.The simple in construction of this compressor bent axle, processing, easy to manufacture, be conducive to improve compressor each parts
Greasy property, thus reduce the input power of compressor, improve work efficiency and the efficiency of compressor,
It addition, according to compressor bent axle of the present utility model, it is also possible to have a following additional technical characteristic:
According to an embodiment of the present utility model, the internal diameter of described oil leak hole is 0.8mm-1.2mm.
According to an embodiment of the present utility model, the centrage of described oblique oil duct tilts relative to the central axis of described main shaft
Arrange.
According to an embodiment of the present utility model, described main shaft is provided with the first blind hole, and described oil leak hole is positioned at described first
Between blind hole and described first oil canal, the two ends of described oblique oil duct are respectively communicated to described first oil canal and described first blind
Hole.
According to an embodiment of the present utility model, in described main shaft, define the second oil canal of open at one end, described main shaft
Sidewall be provided with the second blind hole, described second oil canal is communicated in described second blind hole.
According to an embodiment of the present utility model, the lateral wall of described main shaft is provided with the logical oil of spiral extension along its length
Groove, the two ends of described logical oil groove are respectively communicated in described first blind hole and described second blind hole.
According to an embodiment of the present utility model, the sidewall of described eccentric shaft is provided with and the first of described first oil canal conducting
Through hole, described first through hole radially extending along described eccentric shaft.
According to an embodiment of the present utility model, the sidewall of described main shaft is provided with and leads to the second of described second oil canal conducting
Hole, described second through hole radially extending along described main shaft.
According to the compressor of this utility model second aspect, including according to the compressor bent axle described in above-described embodiment.
According to an embodiment of the present utility model, also include that bearing, described bearing holder (housing, cover) are located on described main shaft and described bearing
End face be only against on the second end of described crank arm, the rolling element raceway of described bearing and described oil leak hole turn on.
Additional aspect of the present utility model and advantage will part be given in the following description, and part will become from the following description
Obtain substantially, or recognized by practice of the present utility model.
Accompanying drawing explanation
Fig. 1 is the partial sectional view in one direction of the compressor bent axle according to this utility model embodiment；
Fig. 2 is the partial sectional view in the other directions of the compressor bent axle according to this utility model embodiment；
Fig. 3 is the installation diagram of the miscellaneous parts such as the compressor bent axle according to this practical information embodiment and bearing；
Fig. 4 is the enlarged drawing in the A portion shown in Fig. 3.
Reference:
100: bent axle；
10: eccentric shaft；11: the first oil canals；12: the first through holes；
20: crank arm；21: the first ends；22: the second ends: 23: tiltedly oil duct；
30: main shaft；31: cannelure；32: oil leak hole；33: the first blind holes；34: the second oil canals；35: the
Two blind holes；36: logical oil groove；37: the second through holes；
200: bearing；210: raceway.
Detailed description of the invention
Of the present utility model embodiment is described below in detail, and the example of described embodiment is shown in the drawings.Below with reference to
The embodiment that accompanying drawing describes is exemplary, it is intended to be used for explaining this utility model, and it is not intended that to of the present utility model
Limit.
1 to Fig. 4 specifically describes the compressor bent axle 100 according to this utility model first aspect embodiment below in conjunction with the accompanying drawings.
As depicted in figs. 1 and 2, eccentric shaft 10, bent axle are included according to the compressor bent axle 100 of this utility model embodiment
Arm 20 and main shaft 30.Specifically, in eccentric shaft 10, define the first oil canal 11, the first end 21 of crank arm 20 (as
Left end shown in Fig. 1) it is connected with one end of eccentric shaft 10, it is provided with the oblique oil connected with the first oil canal 11 in crank arm 20
Road 23, one end of main shaft 30 is connected with the second end 22 (right-hand member as shown in Figure 1) of crank arm 20, main shaft 30 with
One end that crank arm 20 is connected is provided with the circumferentially extending cannelure 31 along main shaft 30, the diapire of cannelure 31 be provided with tiltedly
The oil leak hole 32 of oil duct 23 connection.
In other words, this compressor bent axle 100 is mainly made up of eccentric shaft 10, crank arm 20 and main shaft 30.Wherein, partially
Mandrel 10, crank arm 20 and main shaft 30 (left and right directions as depicted in figs. 1 and 2) the most in the horizontal direction extend, partially
Mandrel 10 is located at the left side of crank arm 20 and is connected with the left end of crank arm 20, main shaft 30 be located at crank arm 20 right side and
It is connected with the right-hand member of crank arm 20, and the central axis of eccentric shaft 10 is in the radially deviation main shaft 30 of main shaft 30
Mandrel line certain distance.
Further, in eccentric shaft 10, define the first oil canal 11 that one end (left end as shown in Figure 1) is unlimited, main
One end (left end as shown in Figure 1) being connected with crank arm 20 of axle 30 is provided with along its circumferentially extending cannelure 31, should
Cannelure 31 is the escape when the main shaft 30 of machining crankshafts 100, and the diapire of cannelure 31 is provided with the footpath along main shaft 30
To the oil leak hole 32 extended, and in crank arm 20, define oblique oil duct 23, the of the left end of oblique oil duct 23 and eccentric shaft 10
One oil canal 11 turns on, and the right-hand member of oblique oil duct 23 turns on the oil leak hole 32 on main shaft 30.
As it is shown on figure 3, when bent axle 100 in use, bearing 200 is located on the main shaft 30 of bent axle 100 and bearing 200
End face is only against the end face of the second end 22 of crank arm 20, so that oil leak hole 32 is the most just to bearing 200, it is ensured that compressor
Operationally, the refrigerator oil in bent axle 100 can enter in bearing 200 under the influence of centrifugal force, reaches to lubricate bearing
The effect of 200, thus reduce the mechanical wear of bearing 200, reduce the input power of compressor, improve compressor
Work efficiency.
Thus, according to the compressor bent axle 100 of this utility model embodiment, neighbouring bent by the main shaft 30 at bent axle 100
The position of armshaft 20 arranges oil leak hole 32 so that operationally, refrigerator oil can be from bent axle 100 for bent axle 100
Oil leak hole 32 is ejected in parts thereon (such as bearing 200), to reach the effect of lubrication, reduces mechanical friction loss,
Thus be conducive to reducing the input power of compressor, improve the work efficiency of compressor.This compressor structure of bent axle 100
Simply, processing, easy to manufacture, be conducive to improving the greasy property of each parts of compressor, thus reduce the input of compressor
Power, improves work efficiency and the efficiency of compressor,
Alternatively, according to an embodiment of the present utility model, the internal diameter of oil leak hole 32 is 0.8mm-1.2mm.Bent axle 100
In use, the outer bearing 200 that is cased with on the main shaft 30 of bent axle 100, and the bent axle of one end of bearing 200 and bent axle 100
The end face of arm 20 only supports and is connected so that the just rolling element raceway to bearing 200 of the oil leak hole 32 on the main shaft 30 of bent axle 100
In 210, it is ensured that the greasy property of bearing 200.Such as, the internal diameter of oil leak hole 32 can be designed as 0.8mm, 1mm or
1.2mm, during design, can select most suitable oil leak hole 32 according to the diameter of different working conditions and main shaft 30
Internal diameter, it is thus possible to make bearing 200 can obtain optimal lubricant effect, is more beneficial for improving the efficiency of compressor.
Advantageously, according to an embodiment of the present utility model, the centrage of oblique oil duct 23 is relative to the central shaft of main shaft 30
Line is obliquely installed.It is to say, in tiltedly the left end of oil duct 23 extends to eccentric shaft 10 and with the first oil canal of eccentric shaft 10
11 conductings, the right-hand member of oblique oil duct 23 extends to interior and with main shaft 30 the oil leak hole 32 of main shaft 30 and turns on, by oblique oil duct 23
It is obliquely installed relative to the central axis of main shaft 30, refrigerator oil both can have been made to flow in oblique oil duct 23 unimpeded, it is ensured that to be
The greasy property of system, can ensure that again the structural strength of bent axle 100, thus ensures the dependability of bent axle 100.
Wherein, according to an embodiment of the present utility model, main shaft 30 is provided with the first blind hole 33, and oil leak hole 32 is positioned at
Between one blind hole 33 and the first oil canal 11, the two ends of oblique oil duct 23 are respectively communicated to the first oil canal 11 and the first blind hole
33.After bent axle 100 and bearing 200 have assembled, bearing 200 is the most right with the cannelure 31 on main shaft 30, so that bearing
The raceway 210 of the rolling element of 200 turns on the oil leak hole 32 on cannelure 31, and when the compressor is operating, refrigerator oil exists
Under the effect of centrifugal force, the refrigerator oil in first passage, oblique oil duct the 23, second blind hole 35 can flow out from oil leak hole 32,
In the raceway 210 of the rolling element being flow to bearing 200 by the oil leak hole 32 on main shaft 30, it is ensured that the profit in bearing 200
Slip, reduces friction loss, thus improves the performance of compressor.
It addition, define the second oil canal 34 of open at one end in main shaft 30, the sidewall of main shaft 30 is provided with the second blind hole 35,
Second oil canal 34 is communicated in the second blind hole 35.Specifically, as depicted in figs. 1 and 2, the sidewall of main shaft 30 is provided with
First blind hole 33 and the second blind hole 35 the most arranged spaced apart, alternatively, the centrage of the first blind hole 33 with
The centrage of the second blind hole 35 is mutually perpendicular to, and thereby may be ensured that the structural strength of the main shaft 30 of bent axle 100.In main shaft 30
Defining the second oil canal 34 that one end (right-hand member as shown in Figure 2) is unlimited, the left end of the second oil canal 34 extends to
In two blind holes 35, left end and second blind hole 35 of the i.e. second oil canal 34 turn on, and refrigerator oil can pass through the second blind hole
35 enter in the second oil canal 34, it is achieved refrigerator oil flowing in the axial direction of bent axle 100, it is ensured that bent axle 100 is with each
The lubricity of parts, thus improve the serviceability of compressor.
Further, according to an embodiment of the present utility model, the lateral wall of main shaft 30 is provided with spiral along its length and prolongs
The logical oil groove 36 stretched, the two ends of logical oil groove 36 are respectively communicated in the first blind hole 33 and the second blind hole 35.It is to say,
The lateral wall of main shaft 30 is provided with the logical oil groove 36 caved inward relative to the outer surface of main shaft 30, logical oil groove 36 curl
Axially extending along main shaft 30 of ground, and in the left end of logical oil groove 36 extends to the first blind hole 33 and turn on the first blind hole 33,
In the right-hand member of logical oil groove 36 extends to the second blind hole 35 and turn on the second blind hole 35, bent axle 100 in the running, fridge
Oil can be respectively enterd in the first blind hole 33 and the second blind hole 35 by logical oil groove 36, it is ensured that refrigerator oil is in bent axle 100
Flowing, thus improve the greasy property of system, improve the performance of compressor today.
Wherein, according to an embodiment of the present utility model, the sidewall of eccentric shaft 10 is provided with and the first oil canal 11 conducting
First through hole 12, the first through hole 12 radially extending along eccentric shaft 10, the sidewall of main shaft 30 is provided with and the second oil canal 34
Second through hole 37 of conducting, the second through hole 37 radially extending along main shaft 30.So, the freezing on bent axle 100 lateral wall
Machine oil can flow into the first oil canal 11 and the second oil canal of bent axle 100 respectively by the first through hole 12 and the second through hole 37
In 34, it is ensured that refrigerator oil is in the flowing within bent axle 100, certainly, the refrigerator oil in bent axle 100 is at the work of centrifugal force
Under with, can also flow out, then to each parts on bent axle 100 (such as from the first through hole 12 and the second through hole 37 respectively
Connecting rod, cylinder etc.) it is lubricated, it is ensured that the greasy property of system, reduce friction loss, thus improve the performance of compressor.
Preferably, bent axle 100 is formed in one part.Thus, integral part of structure is possible not only to ensure the knot of bent axle 100
Structure, stability, and facilitate molding, be simple to manufacture, and eliminate unnecessary assembly parts and connect operation, greatly
Improve greatly the efficiency of assembling of compressor, it is ensured that bent axle 100 and the connection reliability of each parts, furthermore, integral part of knot
Bulk strength and the stability of structure are higher, assemble more convenient, and the life-span is longer.
According to the compressor of this utility model second aspect embodiment, including the bent axle 100 of the compressor according to above-described embodiment.
Owing to the compressor bent axle 100 according to this utility model above-described embodiment has above-mentioned technique effect, therefore, according to this reality
Also have the simple in construction of above-mentioned technique effect, i.e. this compressor with the compressor of new embodiment, each parts connect reliable,
Being convenient to mount and dismount, the greasy property of compressor assembly is good, and efficiency is high.
Wherein, according to an embodiment of the present utility model, compressor also includes that bearing 200, bearing 200 are set in main shaft
On 30 and the end face of bearing 200 is only against on the second end 22 (lower end as shown in Figure 3) of crank arm 20, bearing 200
Rolling element raceway 210 turn on oil leak hole 32.
Specifically, as shown in Figure 3 and Figure 4, in the present embodiment, the main shaft 30 of the bent axle 100 of compressor is provided with bearing
200, one end end face of bearing 200 is only against on the end face of crank arm 20, i.e. bearing 200 and the cannelure on main shaft 30
31 is the most right, so that the raceway 210 of the rolling element of bearing 200 turns on the oil leak hole 32 on cannelure 31, when compressor is transported
During row, on the first oil canal 11 on the eccentric shaft 10 of bent axle 100, the oblique oil duct 23 on crank arm 20, main shaft 30
Logical oil groove the 36, first blind hole the 33, second blind hole 35 on second oil canal 34, main shaft 30, oil leak hole 32 mutual conduction,
Refrigerator oil can flow to the other end from one end of bent axle 100, it is also possible under the influence of centrifugal force, from main shaft 30
Oil leak hole 32 is ejected in the raceway 210 of the rolling element of bearing 200, to reach to lubricate bearing 200, reduce mechanical friction
Effect, thus reduce the input power of compressor, improve the work efficiency of compressor.
Thus, according to the simple in construction of the compressor of this utility model embodiment, each parts connect reliable, are convenient to mount and dismount, are
Greasy property within Tong is good, and frictional dissipation is less, and efficiency is high.
Other of compressor according to this utility model embodiment constitute and operate the most all
It is known, is not detailed herein.
In description of the present utility model, it is to be understood that term " " center ", " longitudinally ", " laterally ", " length ", " width
Degree ", " thickness ", " on ", D score, "front", "rear", "left", "right", " vertically ", " level ", " top ", " end "
The orientation of the instruction such as " interior ", " outward ", " clockwise ", " counterclockwise ", " axially ", " radially ", " circumferential " or position relationship
For based on orientation shown in the drawings or position relationship, it is for only for ease of description this utility model and simplifies description rather than refer to
Show or imply the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not manage
Solve as to restriction of the present utility model.
Additionally, term " first ", " second " are only used for describing purpose, and it is not intended that instruction or hint relative importance
Or the implicit quantity indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can be expressed
Or implicitly include at least one this feature.In description of the present utility model, " multiple " are meant that at least two, example
Such as two, three etc., unless otherwise expressly limited specifically.
In this utility model, unless otherwise clearly defined and limited, term " install ", " being connected ", " connection ", " Gu
Fixed " etc. term should be interpreted broadly, connect for example, it may be fixing, it is also possible to be to removably connect, or integral；Can
Be mechanically connected, it is also possible to be electrical connection or each other can communication；Can be to be joined directly together, it is also possible to by between intermediary
Connect connected, can be connection or the interaction relationship of two elements of two element internals, unless otherwise clear and definite restriction.
For the ordinary skill in the art, concrete in this utility model of above-mentioned term can be understood as the case may be
Implication.
In this utility model, 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 it is merely representative of fisrt feature level height higher than second feature.Fisrt feature second feature " under ",
" lower section " and " below " can be fisrt feature immediately below second feature or obliquely downward, or it is special to be merely representative of first
Levy level height less than second feature.
In the description of this specification, reference term " embodiment ", " some embodiments ", " example ", " concrete example ",
Or specific features, structure, material or the feature that the description of " some examples " etc. means to combine this embodiment or example describes
It is contained at least one embodiment of the present utility model or example.In this manual, the schematic representation to above-mentioned term
Necessarily it is directed to identical embodiment or example.And, the specific features of description, structure, material or feature are permissible
One or more embodiment in office or example combine in an appropriate manner.Additionally, in the case of the most conflicting, ability
The feature of the different embodiments described in this specification or example and different embodiment or example can be entered by the technical staff in territory
Row combines and combination.
Although above it has been shown and described that embodiment of the present utility model, it is to be understood that above-described embodiment is example
Property, it is impossible to being interpreted as restriction of the present utility model, those of ordinary skill in the art can in the range of this utility model
Above-described embodiment be changed, revise, to replace and modification.
Claims (10)
1. a compressor bent axle, it is characterised in that including:
Eccentric shaft, defines the first oil canal in described eccentric shaft；
Crank arm, the first end of described crank arm is connected with one end of described eccentric shaft, is provided with and described in described crank arm
The oblique oil duct of one oil canal connection；
Main shaft, one end of described main shaft is connected with the second end of described crank arm, one end being connected with crank arm of described main shaft
Being provided with the circumferentially extending cannelure along described main shaft, the diapire of described cannelure is provided with the oil leak hole connected with described oblique oil duct.
2. according to the compressor bent axle described in claim 1, it is characterised in that the internal diameter of described oil leak hole is
0.8mm-1.2mm。
3. according to the compressor bent axle described in claim 1, it is characterised in that the centrage of described oblique oil duct relative to
The central axis of described main shaft is obliquely installed.
4. according to the compressor bent axle described in claim 1, it is characterised in that described main shaft is provided with the first blind hole,
Described oil leak hole is between described first blind hole and described first oil canal, and the two ends of described oblique oil duct are respectively communicated to described
First oil canal and described first blind hole.
5. according to the compressor bent axle described in claim 4, it is characterised in that define open at one end in described main shaft
The second oil canal, the sidewall of described main shaft is provided with the second blind hole, and described second oil canal is communicated in described second blind hole.
6. according to the compressor bent axle described in claim 5, it is characterised in that the lateral wall of described main shaft is provided with along it
The logical oil groove of length direction spiral extension, the two ends of described logical oil groove are respectively communicated to described first blind hole and described second blind hole
In.
7. according to the compressor bent axle described in claim 5, it is characterised in that the sidewall of described eccentric shaft is provided with and institute
State the first through hole of the first oil canal conducting, described first through hole radially extending along described eccentric shaft.
8. according to the compressor bent axle described in claim 5, it is characterised in that the sidewall of described main shaft is provided with described
Second through hole of the second oil canal conducting, described second through hole radially extending along described main shaft.
9. a compressor, it is characterised in that include according to the compressor bent axle according to any one of claim 1-8.
10. according to the compressor described in claim 9, it is characterised in that also include that bearing, described bearing holder (housing, cover) are located at institute
Stating on main shaft and the end face of described bearing is only against on the second end of described crank arm, the rolling element raceway of described bearing is with described
Oil leak hole turns on.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620499322.XU CN205779557U (en) | 2016-05-23 | 2016-05-23 | Compressor bent axle and the compressor with it |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620499322.XU CN205779557U (en) | 2016-05-23 | 2016-05-23 | Compressor bent axle and the compressor with it |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205779557U true CN205779557U (en) | 2016-12-07 |
Family
ID=57408717
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620499322.XU Active CN205779557U (en) | 2016-05-23 | 2016-05-23 | Compressor bent axle and the compressor with it |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205779557U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109578241A (en) * | 2018-10-16 | 2019-04-05 | 杭州钱江制冷压缩机集团有限公司 | Novel crankshaft structure for compressor |
| CN111836963A (en) * | 2018-01-19 | 2020-10-27 | 思科普有限责任公司 | Crankshaft |
| CN112628118A (en) * | 2020-11-03 | 2021-04-09 | 珠海格力节能环保制冷技术研究中心有限公司 | Crankshaft mechanism of double-support piston compressor and piston compressor |
-
2016
- 2016-05-23 CN CN201620499322.XU patent/CN205779557U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111836963A (en) * | 2018-01-19 | 2020-10-27 | 思科普有限责任公司 | Crankshaft |
| CN109578241A (en) * | 2018-10-16 | 2019-04-05 | 杭州钱江制冷压缩机集团有限公司 | Novel crankshaft structure for compressor |
| CN112628118A (en) * | 2020-11-03 | 2021-04-09 | 珠海格力节能环保制冷技术研究中心有限公司 | Crankshaft mechanism of double-support piston compressor and piston compressor |
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