CN104061141B - Even dynamic pipeline pump - Google Patents
Even dynamic pipeline pump Download PDFInfo
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- CN104061141B CN104061141B CN201410243605.3A CN201410243605A CN104061141B CN 104061141 B CN104061141 B CN 104061141B CN 201410243605 A CN201410243605 A CN 201410243605A CN 104061141 B CN104061141 B CN 104061141B
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Abstract
A kind of even dynamic pipeline pump, it includes pump case, there is in pump case cylindrical lumens, the inwall of cylindrical lumens is provided with multiple convex curvature, central shaft it is provided with in cylindrical lumens, central shaft is provided with two eccentrics, a bearing respectively it is fixed with outside two eccentrics, two bearings are respectively fixed with a pinch roller, two are formed with two gaps between pinch roller and the inwall of cylindrical lumens, being provided with the fluid-through tube of elastically deformable in two gaps, be provided with filtering joint on pump case, filtering joint is provided with inlet opening and liquid outlet.By pinch roller, fluid-through tube is compressed completely at minimum clearance, liquid can not be passed through, when driven by motor central axis, liquid in pipe is pressed by pinch roller through fluid-through tube, both sides at described minimum clearance form pressure differential, drawing liquid at low pressure side, liquid is discharged by high pressure side so that two fluid-through tubes are exported respective pulsating flow and merge into, at inlet opening and the liquid outlet of filtering joint, the flow that ripple amplitude is relatively uniform.
Description
[technical field]
The present invention relates to liquid pump, particularly relate to a kind of pulsation making flow and pressure and reduce, with
Realize the even dynamic pipeline pump of approximation constant current.
[background technology]
Pump is a kind of machinery carrying liquid or making fluid pressurization.It by the mechanical energy of prime mover or other
External energy sends liquid to, makes liquid energy increase.Pump is widely used in carrying water, oil, soda acid
The liquid such as liquid, emulsion, suspended emulsion and liquid metal, it is possible to carry liquid, gas mixture and contain suspension
The liquid of solids.Traditional pump includes centrifugal pump, membrane pump, piston pump, peristaltic pump etc..Changing
The fields such as work, food, pharmacy, biological engineering, have higher requirements to flow pulsation and flow accuracy,
And conventional pump cannot fully meet requirement, product quality in using, cannot be ensured.Therefore it provides it is a kind of
Flow is the most relevant with rotating speed within the specific limits, and unrelated with pressure, and flow pulsation is little or pulse free
Liquid pump just become a kind of objective demand.
[summary of the invention]
Present invention seek to address that the problems referred to above, and provide a kind of pressure fluctuation little, flow accuracy is high, disappears
Poison sterilizing is convenient, and service life is long, low cost, reliable operation and easily controllable even dynamic of work process
Pipeline pump.
For achieving the above object, the present invention provides a kind of even dynamic pipeline pump, and this even dynamic pipeline pump includes pump
Shell, has cylindrical lumens in pump case, and on the inwall of this cylindrical lumens, circumferentially compartment of terrain sets
There is multiple smooth inwardly protruded convex curvature, pump case sets between two adjacent convex curvature
There are four breach being connected with cylindrical lumens, are provided with coaxial with cylindrical lumens in cylindrical lumens
The central shaft of the heart, this central shaft is connected with motor, and central shaft is provided with two in 180 degree of anti-phase settings
Eccentric, be respectively fixed with a bearing outside two eccentrics, each fixing on two bearing outer rings
Having a pinch roller, two form two along the circumferential direction changed between pinch roller and the inwall of cylindrical lumens
Individual gap, is respectively equipped with the fluid-through tube of elastically deformable in two gaps, two of two fluid-through tubes
Feed liquor port and two liquid outlet mouths are stretched out by the four of pump case breach, are positioned at four breach on pump case
Outside is provided with filtering joint, and four ports of two fluid-through tubes connect with four sealing joints of filtering joint
Connecing, described filtering joint is provided with an inlet opening and a liquid outlet, and described inlet opening and liquid outlet divide
It is not connected with two feed liquor ports and two liquid outlet mouths, said two pinch roller and cylindrical lumens
By pinch roller, fluid-through tube is compressed completely at the minimum clearance of the convex curvature of inwall so that liquid can not lead to
Crossing, when driven by motor central axis, described minimum clearance along the circumferential direction moves, described pinch roller
Pressing liquid in pipe through fluid-through tube, the both sides at described minimum clearance form pressure differential, in low pressure
Side draws liquid into, and liquid is discharged by high pressure side so that two fluid-through tubes are exported each self-pulsing
Flow merges into, at the liquid outlet of filtering joint, the flow that ripple amplitude is relatively uniform.
Pump case is made up of pump case main body, the first end cap, the second end cap, and wherein, the first end cap is fixed on
One end of pump case main body, the second end cap is fixed on the other end of pump case main body.
One end of central shaft is by the clutch shaft bearing supporting being fixed in the first end cap, the other end of central shaft
By the second bearing supporting being fixed in the second end cap.
Described eccentric is the circular wheel-shaped body that its axle center is arranged with eccentricity of central axis.
Described fluid-through tube is made up of elastomeric material.
One end of filtering joint is provided with cavity, is provided with four interfaces at cavity bottom, outside four interfaces
Being provided with an inlet opening and a liquid outlet, two of which interface is connected with inlet opening, two other
Interface is connected with liquid outlet, and the exit of described inlet opening and liquid outlet is respectively equipped with pipe joint,
The side away from cavity of filtering joint is fixed with filtering connector cover, is provided with laterally in the lower end of liquid outlet
Through hole, this cross through hole is by liquid outlet and described filtering connector cover intracavity inter-connection, the part of liquid outlet
Liquid is in this cross through hole enters filtering connector cover inner chamber.
Multiple even dynamic pipeline pumps can be superimposed with each other connection, and parallel combination becomes coaxial pipeline pump, combination
After pipeline pump share the filtering same inlet opening of joint and liquid outlet.
The eccentric of multiple even dynamic pipeline pumps is arranged by the phase place of phase place=360 ° ÷ fluid-through tube radical.
The contribution of the present invention is, it efficiently solves conventional pump cannot meet flow pulsation and flow essence
The problems such as degree requirement.The even dynamic pipeline pump of the present invention is provided circumferentially about by the inwall at cylindrical lumens
Convex curvature, and by pinch roller, fluid-through tube is compressed completely at each convex curvature, thus between minimum
At gap, both sides form pressure differential, and low pressure side draws liquid into, and liquid is discharged by high pressure side so that
Pressure fluctuation is less, and flow accuracy is higher, and the work efficiency of pump is higher, and service life is longer.To the greatest extent
The flow that two fluid-through tubes of pipe each export is fluctuation, but because of the anti-phase setting of eccentric and two logical liquid
The flow of pipe output is gone out liquid by same liquid outlet, thus the flow each exported by two fluid-through tubes is altogether
The flow that ripple amplitude is little is merged into, it is achieved that ripple amplitude relatively uniform with liquid outlet.Additionally,
The flow of the even dynamic pipeline pump of the present invention is the most relevant with rotating speed within the specific limits, and unrelated with pressure,
It is thus susceptible to control and use safety.Additionally, valveless on the even dynamic pipeline pump of the present invention, the most not
Easily blocking, works relatively reliable, and the present invention also has simple in construction, it is easy to implementing, range is wide
Etc. feature.
[accompanying drawing explanation]
Fig. 1 is the appearance schematic diagram of the present invention.
Fig. 2 is the structure sectional view of the present invention.
Fig. 3 is the A direction view of Fig. 2.
Fig. 4 is the pump shell structure schematic diagram of the present invention.
Fig. 5 is the filtering joints schematic diagram of the present invention.
Fig. 6 is the rearview of Fig. 5.
Fig. 7 is the B direction view of Fig. 6.
Fig. 8 is the C direction view of Fig. 6.
Fig. 9 is filtering connector cover structural representation.
Figure 10 is the first end cover structure schematic diagram.
Figure 11 is the second end cover structure schematic diagram.
Figure 12 is the even dynamic pipeline pump structure schematic diagram of combination type of the present invention.
[detailed description of the invention]
The following example is further explanation of the present invention, and the present invention does not constitute any limit
System.
Refering to Fig. 1～Fig. 3, the even dynamic pipeline pump 100 of the present invention includes pump case 10, central shaft 20,
Eccentric 31,32, pinch roller 51,52, fluid-through tube 61,62 and filtering joint 70.
Such as Fig. 1～Fig. 3, this even dynamic pipeline pump 100 includes a steel pump case 10, in the present embodiment, institute
State pump case 10 by pump case main body the 12, first end cap the 13, second end cap 14 structure.Described first end cap 13
As shown in Figure 10, its center has dead eye 131 to structure, is fixed with for supporting in dead eye 131
The bearing 132 of central shaft 20, is provided with U-lag on its end face with pump case main body 12 opposite side
133, it is built with O-ring seals, and such as Fig. 2, this first end cap 13 is screwed in pump case main body
The upper end of 12.As shown in figure 11, its center has dead eye 141 to described second end cap 14 structure,
In the present embodiment, this dead eye 141 is blind hole, in other embodiments, such as multiple even dynamic pipeline pumps
In the case of being applied in combination, this dead eye 141 can also be through hole.It is fixed with use in dead eye 41
In the bearing 142 of supporting central shaft 20, its end face with pump case main body 12 opposite side is provided with U
Shape groove 143, it is built with O-ring seals.Such as Fig. 2, this second end cap 14 is screwed in pump
The lower end of shell main body 12.Such as Fig. 3, Fig. 4, there is in pump case 10 cylindrical lumens 11, at this circle
The inwall of cylindrical interior volume 11 is provided with multiple inwardly protruded convex curvature 111, multiple convex curvature 111
Circle spacing along interior cavity wall is arranged, and in the present embodiment, the plurality of convex curvature 111 is smooth
Cambered surface, it is formed between the internal chamber wall of pump case 10 circumferentially square for coordinating with pinch roller 51,52
Minimum clearance to change.Being provided with four breach 121 on pump case 10, these four breach 121 are positioned at
Between two adjacent convex curvature 111, and it is connected with cylindrical lumens, is used for inserting and drawing
Fluid-through tube 61,62.
As shown in Figure 2 and Figure 3, in cylindrical lumens 11, be provided with central shaft 20, this central shaft 20 with
The coaxial heart, and this central shaft 20 stretches out by the first end cap 13 upper end, and with motor (in figure not
Illustrate) it is connected, drive central shaft 20 to rotate by motor.In the present embodiment, on central shaft 20
Being fixed with two eccentrics 31,32 in 180 degree of anti-phase settings, this eccentric 31,32 is circular wheel
Shape body, its axle center and central shaft 20 the most on the same axis, therefore in eccentric setting.Two bias
Wheel 31,32 is outside is respectively fixed with a bearing 41,42 by conventional methods, two bearings 41,
Respectively being fixed with a pinch roller 51,52 by conventional method on 42 outer rings, this pinch roller 51,52 is annular
Wheel-shaped body, in the embodiment shown in Fig. 2, the outer circumference surface of this pinch roller 51,52 is recessed cambered surface.
Such as Fig. 2, Fig. 3, formed between two pinch rollers 51,52 and the internal chamber wall of pump case 10 two gap 10A,
10B, during even dynamic pipeline pump work, the size of these two gaps 10A, 10B with two eccentrics 31,
The rotation of 32 is along the circumferential direction in the change progressively expanded or shunk.Divide in two gaps 10A, 10B
Not being provided with the fluid-through tube 61,62 of elastically deformable, this fluid-through tube 61,62 is by can the high intensity of resisting fatigue
Elastomeric material, as the materials such as compounded rubber, high strength plastic, high-strength composite silica gel are made, preferably
High-strength composite silica gel.Two fluid-through tubes 61,62 are respectively arranged with a feed liquor port 621,622, and are respectively arranged with
One liquid outlet mouth 623,624, feed liquor port 621,622 and liquid outlet mouth 623,624 respectively by
Four breach 121 of pump case stretch out.Such as Fig. 3, pump case 10 is positioned at outside four breach and is provided with filter
Ripple joint 70, its structure is as shown in Fig. 5～Fig. 9, and this filtering joint 70 is blocks, and its one end sets
Have cavity 70A, cavity bottom be provided with four for connect the interface 71 of fluid-through tube 61,62,72,
73,74, outside four interfaces, it is provided with an inlet opening 75 and a liquid outlet 76, wherein, two
Interface 71,72 is connected with feed liquor port 621,622 and the inlet opening 75 of two fluid-through tubes respectively,
Two other interface 73,74 respectively with liquid outlet mouth 623,624 and the liquid outlet 76 of two fluid-through tubes
Being connected, the exit of described inlet opening and liquid outlet is respectively equipped with pipe joint 77,78, is used for connecting
Feed tube and drain pipe (not shown).Solid in the side away from cavity 70A of filtering joint 70
Surely there is filtering connector cover 79.Being provided with cross through hole 761 in the lower end of liquid outlet 76, this cross through hole will
Liquid outlet 76 and described filtering connector cover 79 intracavity inter-connection, the partially liq of liquid outlet 76 is through this horizontal stroke
Enter in filtering connector cover 79 inner chamber to through hole 761 so that filtering connector cover 79 inner chamber has liquid
Body and compressed air, this compressed air makes flow and the fluctuating margin of pressure that even dynamic pipeline pump exports
Decayed.As shown in Fig. 3, Fig. 5, from inlet opening 75 enter liquid respectively by feed liquor port 621,
622 enter in two fluid-through tubes 61,62, are entered liquid outlet by liquid outlet mouth 623,624 after work
76, merge into the flow that ripple amplitude is relatively uniform.
As shown in Figure 2 and Figure 3, said two pinch roller 51,52 is interior with cylindric for operation principle of the present invention
By pinch roller 51,52 by complete for fluid-through tube 61,62 at the minimum clearance of the convex curvature 111 of the inwall in chamber
Total head is tight so that liquid can not pass through, when driven by motor central shaft 20 rotates, and described minimum clearance
Along the circumferential direction moving, described pinch roller 51,52 presses through 61,62 pairs of liquid in pipe of fluid-through tube,
Both sides at described minimum clearance form pressure differential, draw liquid at low pressure side, and high pressure side will
Liquid is discharged so that two fluid-through tubes 61,62 are exported respective pulsating flow at filtering joint 70
Inlet opening 75 and liquid outlet 76 merge into the flow that ripple amplitude is relatively uniform.
More specifically, such as Fig. 2, Fig. 3, when two eccentrics 31,32 turn to, its outside
Two pinch rollers 51,52 form the inwall with cylindrical lumens at each convex curvature 111 of pump case 10
Minimum clearance, the inner chamber of i.e. two pinch rollers 51,52 farthest away from central shaft 20 center of circle and pump case
The correspondence position of each convex curvature 111 be minimum clearance.In the present embodiment, this minimum clearance should
Twice less than fluid-through tube 61,62 wall thickness.When driven by motor central shaft 20 rotates, described phase place
Difference is that the minimum clearance of 180 degree along the circumferential direction moves, 51,52 pairs of fluid-through tubes 61,62 of described pinch roller
Interior liquid pressure, at described minimum clearance, pinch roller 51,52 is by complete for described fluid-through tube 61,62
Total head is tight so that liquid can not pass through, and the both sides at described minimum clearance form pressure differential, low
Pressure side draws liquid into, and liquid is discharged by high pressure side, although the stream that two fluid-through tubes each export
Amount is fluctuation, but because the flow of the anti-phase setting of eccentric and two fluid-through tube outputs is by same liquid outlet 76
Go out liquid, thus the flow each exported by two fluid-through tubes merges into ripple amplitude at common liquid outlet 76
Little or pulseless flow.
As shown in figure 12, in other embodiments, the above-mentioned even dynamic pipeline pump of the present invention is also combined into
The even dynamic pipeline pump of combination type containing described multiple even dynamic pipeline pump 100, the most as shown in figure 11,
Described even dynamic pipeline pump 100 is superimposed with each other vertically and connects, its common center axle 20, filtering
Joint 70 and same inlet opening 75 and liquid outlet 76.In this embodiment, multiple even dynamic pipeline pumps 100
The phase place of eccentric press formula: phase place=360 ° ÷ fluid-through tube radical calculates, when being 4 such as fluid-through tube,
Then the phase place between four eccentrics is 90 °.
Although being disclosed the present invention by above example, but protection scope of the present invention is not
It is confined to this, under conditions of without departing from present inventive concept, deformation that above each component is done, replaces
Change etc. and all will fall within the claims of the present invention
Claims (8)
1. an even dynamic pipeline pump, it is characterised in that this even dynamic pipeline pump (100) includes pump case (10),
There is in pump case (10) cylindrical lumens (11), edge on the inwall of this cylindrical lumens (11)
Circle spacing it is provided with multiple smooth inwardly protruded convex curvature (111), on pump case (10)
Four breach being connected with cylindrical lumens it are provided with between two adjacent convex curvature (111)
(121), the central shaft (20) with cylindrical lumens concentric in cylindrical lumens (11), it is provided with, should
Central shaft (20) is connected with motor, and central shaft (20) is provided with two in 180 degree of anti-phase settings
Eccentric (31,32), two eccentric (31,32) outsides are respectively fixed with a bearing (41,42),
Two bearings (41,42) outer ring is respectively fixed with a pinch roller (51,52), two pinch rollers (51,
52) and formed between the inwall of cylindrical lumens (11) along the circumferential direction change two gaps (10A,
10B), in two gaps (10A, 10B), it is respectively equipped with the fluid-through tube (61,62) of elastically deformable,
Two feed liquor ports (621,622) of two fluid-through tubes (61,62) and two liquid outlet mouths (623,
624) stretched out by the four of pump case breach (121), pump case (10) is positioned at outside four breach
It is provided with filtering joint (70), four ports (621,622,623,624) of two fluid-through tubes and filter
Four interfaces (71,72,73,74) of ripple joint (70) are tightly connected, described filtering joint (70)
It is provided with an inlet opening (75) and a liquid outlet (76), described inlet opening (75) and liquid outlet (76)
It is connected with two feed liquor ports (621,622) and two liquid outlet mouths (623,624) respectively,
The convex curvature (111) of the inwall of said two pinch roller (51,52) and cylindrical lumens (11)
By pinch roller (51,52), fluid-through tube (61,62) is compressed completely at minimum clearance so that liquid is not
Can pass through, when driven by motor central shaft (20) rotates, described minimum clearance along the circumferential direction moves,
Liquid in pipe is pressed by described pinch roller (51,52) through fluid-through tube (61,62), between described minimum
Both sides at gap form pressure differential, draw liquid at low pressure side, and liquid is discharged by high pressure side,
Make two fluid-through tubes (61,62) exported respective pulsating flow filtering joint (70) go out liquid
The flow that ripple amplitude is relatively uniform is merged in hole (76).
Even dynamic pipeline pump the most as claimed in claim 1, it is characterised in that described pump case (10) by
Pump case main body (12), the first end cap (13), the second end cap (14) are constituted, wherein, and the first end cap
(13) being fixed on one end of pump case main body (12), the second end cap (14) is fixed on pump case main body (12)
The other end.
Even dynamic pipeline pump the most as claimed in claim 2, it is characterised in that described central shaft (20)
One end by clutch shaft bearing (21) supporting being fixed in the first end cap (13), another of central shaft
Hold by the second bearing (22) supporting being fixed in the second end cap (14).
Even dynamic pipeline pump the most as claimed in claim 1, it is characterised in that described eccentric (31,
32) it is its axle center and the circular wheel-shaped body of the axle center eccentric setting of central shaft (20).
Even dynamic pipeline pump the most as claimed in claim 1, it is characterised in that described fluid-through tube (61,
62) it is made up of elastomeric material.
Even dynamic pipeline pump the most as claimed in claim 1, it is characterised in that described filtering joint (70)
One end be provided with cavity (70A), be provided with four interfaces (71,72,73,74) at cavity bottom, four
An inlet opening (75) and a liquid outlet (76) it is provided with outside individual interface, two of which interface (71,
72) it is connected with inlet opening (75), two other interface (73,74) and liquid outlet (76) phase
Connection, the exit of described inlet opening and liquid outlet is respectively equipped with pipe joint (77,78), connects in filtering
The side away from cavity (70A) of head is fixed with filtering connector cover (79), at liquid outlet (76)
Lower end is provided with cross through hole (761), and this cross through hole is by liquid outlet (76) and described filtering connector cover
(79) intracavity inter-connection, the partially liq of liquid outlet (76) enters filter through this cross through hole (761)
In ripple connector cover (79) inner chamber.
Even dynamic pipeline pump the most as claimed in claim 1, it is characterised in that multiple even dynamic pipeline pumps (100)
Can be superimposed with each other connection, and parallel combination becomes coaxial pipeline pump (200), the pipeline pump (200) after combination
Share same inlet opening (75) and the liquid outlet (76) of filtering joint (70).
Even dynamic pipeline pump the most as claimed in claim 7, it is characterised in that multiple even dynamic pipeline pumps (100)
Eccentric by phase place=360 ° ÷ fluid-through tube radical phase place arrange.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410243605.3A CN104061141B (en) | 2014-06-04 | 2014-06-04 | Even dynamic pipeline pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410243605.3A CN104061141B (en) | 2014-06-04 | 2014-06-04 | Even dynamic pipeline pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104061141A CN104061141A (en) | 2014-09-24 |
| CN104061141B true CN104061141B (en) | 2016-08-24 |
Family
ID=51549024
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410243605.3A Active CN104061141B (en) | 2014-06-04 | 2014-06-04 | Even dynamic pipeline pump |
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| Country | Link |
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| CN (1) | CN104061141B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106567822A (en) * | 2016-11-04 | 2017-04-19 | 肖立峰 | Pipeline membrane pump |
| WO2018082066A1 (en) * | 2016-11-04 | 2018-05-11 | 肖立峰 | Pipeline diaphragm pump |
| CN113560050B (en) * | 2020-04-29 | 2023-08-15 | 路达(厦门)工业有限公司 | Water outlet device, shower head, spray gun and faucet |
| CN113027736B (en) * | 2021-05-19 | 2021-09-03 | 楚天源创生物技术(长沙)有限公司 | Infusion pump |
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| JPH09177677A (en) * | 1995-12-25 | 1997-07-11 | Nagao Tamagawa | Tube pump |
| KR20030063981A (en) * | 2002-01-25 | 2003-07-31 | 박종국 | Hose pump |
| CN1789712A (en) * | 2004-12-16 | 2006-06-21 | 李辉 | Double eccentric wheel type hose pump |
| JP2007198149A (en) * | 2006-01-24 | 2007-08-09 | Aquatech:Kk | Tube pump |
| CN200946560Y (en) * | 2006-07-25 | 2007-09-12 | 河南省耿力机电发展有限公司 | Double-link extrusion type grouting pump |
| CN101078398A (en) * | 2007-07-03 | 2007-11-28 | 周天清 | Rolling extrusion soft variable-volume fluid mechanical device |
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2014
- 2014-06-04 CN CN201410243605.3A patent/CN104061141B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09177677A (en) * | 1995-12-25 | 1997-07-11 | Nagao Tamagawa | Tube pump |
| KR20030063981A (en) * | 2002-01-25 | 2003-07-31 | 박종국 | Hose pump |
| CN1789712A (en) * | 2004-12-16 | 2006-06-21 | 李辉 | Double eccentric wheel type hose pump |
| JP2007198149A (en) * | 2006-01-24 | 2007-08-09 | Aquatech:Kk | Tube pump |
| CN200946560Y (en) * | 2006-07-25 | 2007-09-12 | 河南省耿力机电发展有限公司 | Double-link extrusion type grouting pump |
| CN101078398A (en) * | 2007-07-03 | 2007-11-28 | 周天清 | Rolling extrusion soft variable-volume fluid mechanical device |
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| Publication number | Publication date |
|---|---|
| CN104061141A (en) | 2014-09-24 |
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Effective date of registration: 20220713 Address after: 410600 no.197, section 4, Jinzhou Avenue, Ningxiang Economic and Technological Development Zone, Changsha City, Hunan Province Patentee after: Chutianyuanchuang Biotechnology (Changsha) Co.,Ltd. Address before: 518000 11 5A, Yujing East, Nanshan District, Shenzhen, Guangdong Patentee before: Xiao Lifeng |