CN108506192A - A kind of piston compressor inlet valve - Google Patents
A kind of piston compressor inlet valve Download PDFInfo
- Publication number
- CN108506192A CN108506192A CN201810521394.3A CN201810521394A CN108506192A CN 108506192 A CN108506192 A CN 108506192A CN 201810521394 A CN201810521394 A CN 201810521394A CN 108506192 A CN108506192 A CN 108506192A
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- China
- Prior art keywords
- valve
- valve rod
- spring
- valve body
- baffle ring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- 230000007246 mechanism Effects 0.000 claims abstract description 53
- 238000007789 sealing Methods 0.000 claims description 38
- 239000000463 material Substances 0.000 claims description 14
- 229910001220 stainless steel Inorganic materials 0.000 claims description 7
- 239000004696 Poly ether ether ketone Substances 0.000 claims description 6
- 239000007769 metal material Substances 0.000 claims description 6
- 229920002530 polyetherether ketone Polymers 0.000 claims description 6
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 6
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 4
- -1 polytetrafluoroethylene Polymers 0.000 claims description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims 1
- 239000010931 gold Substances 0.000 claims 1
- 229910052737 gold Inorganic materials 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 5
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000013459 approach Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- JUPQTSLXMOCDHR-UHFFFAOYSA-N benzene-1,4-diol;bis(4-fluorophenyl)methanone Chemical compound OC1=CC=C(O)C=C1.C1=CC(F)=CC=C1C(=O)C1=CC=C(F)C=C1 JUPQTSLXMOCDHR-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000003519 ventilatory effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/10—Adaptations or arrangements of distribution members
- F04B39/102—Adaptations or arrangements of distribution members the members being disc valves
- F04B39/1033—Adaptations or arrangements of distribution members the members being disc valves annular disc valves
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Compressor (AREA)
Abstract
The invention discloses a kind of piston compressor inlet valve, Compressor Technology fields.Including valve body, valve rod, air intake duct, elastic mechanism and position-limit mechanism；The valve stem sleeve is mounted in valve inner, and the air intake duct of stem bottom and valve inner seals, and it can be moved up and down by elastic mechanism and position-limit mechanism, the elastic mechanism is arranged between valve body and valve rod, and the position-limit mechanism is arranged is adapted position what any position of valve stem top or body top or both combined.The inlet valve greatly improves volumetric efficiency by rationally designing, and improves Energy Efficiency Ratio, reduces noise and extends service life.
Description
Technical field
The present invention relates to Compressor Technology fields.
Background technology
Compressor is a kind of driven fluid machinery that low-pressure gas is promoted to high pressure gas.Inlet valve is compressor compresses
The gate of chamber, response speed, sealing effect and action friction directly affect the gas production of compressor complete machine, power and make an uproar
Sound.Currently, the environmental consciousness of people is more and more stronger, to it is energy saving, efficiently require higher and higher, compressed compared with existing market upper piston
Machine is generally three-level efficiency, and there is the demand to high energy efficiency compressor in market.
Existing Reciprocting piston compressor inlet valve mostly uses the structure type such as Fig. 2, and suction valve chip is sheet, and material is
Steel.Descent of piston when compressor air suction, suction valve chip upper and lower faces generate pressure difference, after suction valve chip flexural deformation with valve
Gap is formed between plate, air enters cylinder from this gap；Suction valve chip upper and lower faces pressure difference disappears when piston stroking upward compressed air
It loses, suction valve chip replys straightened condition, is close to valve plate and plays the role of seal compression gas.Suction valve chip is frequent when compressor operating
It opens and closes, and valve plate is also steel, mutually collision thus generation noise.It is flat seal, poor sealing between suction valve chip and valve plate
Leakage is big, and compressor volumetric efficiency is low.For the problem that inlet seal set forth above is poor, noise is big and air inlet gap, this
Invention proposes a kind of solution of suitable piston compressor.
Invention content
Technical problem to be solved by the invention is to provide a kind of piston compressor inlet valve, the inlet valve valve rod bottom surfaces
Same plane is kept with valve body bottom surface, compressor piston infinite approach plane in compressive state can be made, clearance will be compressed
It minimizes, greatly improves volumetric efficiency, improve Energy Efficiency Ratio；It is changed by the progress air-breathing that pumps of valve rod
Intake method, while also ensuring that the noise of inlet valve is small and long lifespan.
In order to solve the above technical problems, the technical solution used in the present invention is：A kind of piston compressor inlet valve, packet
Include valve body, valve rod, air intake duct, elastic mechanism and position-limit mechanism；The valve stem sleeve is mounted in valve inner, and stem bottom and valve body
Internal air intake duct sealing, and being moved up and down by elastic mechanism and position-limit mechanism, the elastic mechanism setting in valve body and
Between valve rod, the position-limit mechanism is arranged is adapted position what any position of valve stem top or body top or both combined
It sets.
The technical solution advanced optimized is that the valve rod is inverted T-type structure, and top is motion bar, and lower part is sealing block,
And the vertical height of valve rod is higher than the vertical height of valve body, the size of the sealing block is adapted with air intake duct, and the valve body is set
There is centre pilot compatible with valve rod hole.
The technical solution advanced optimized is that the air intake duct is the venthole being arranged in valve inner, and the venthole is extremely
It is one less, the venthole bottom is intercommunicating pore, and is adapted with the sealing block size of stem bottom.
The technical solution advanced optimized is that the sealing block is hemisphere face or conical surface projection cube structure, the upper convex surface of sealing block
It matches with the inner surface of air intake duct, forms sealing；The lower plane of sealing block and the lower plane of valve body are in same plane.
The technical solution advanced optimized is that the elastic mechanism is made of the first spring, and first spring passes through limit
Mechanism is fixed between valve rod and valve body, is in compressive state or non-compressed state, and when its inlet valve being made to work, valve rod moves up and down
It can seal and open and close with air intake duct.
The technical solution advanced optimized is that the internal or external of first spring is additionally provided with second spring, described second
Spring is limit spring, and the elasticity modulus of second spring is more than the first spring.
The technical solution advanced optimized is that the position-limit mechanism is mainly made of the first baffle ring, the first baffle ring setting
It is connected at the top of valve rod, and with elastic mechanism.
The technical solution advanced optimized is that the position-limit mechanism is additionally provided with the second baffle ring, and second baffle ring is arranged in valve
At the top of body, for limiting elastic mechanism.
The technical solution advanced optimized is that first spring is arranged and is adapted position in the first baffle ring or the second baffle ring
It sets or is arranged simultaneously and be adapted position in the first baffle ring or the second baffle ring, mutually fitting in the second baffle ring is arranged in the second spring
With position.
The technical solution advanced optimized is that the valve body uses metal material, the valve rod to use nonmetallic polyether-ether-ketone
Material or nonmetallic polytetrafluoroethylene (PTFE) material or stainless steel, the elastic mechanism and position-limit mechanism use metal material.
It is using advantageous effect caused by above-mentioned technical proposal：The present invention change traditional compressor inlet valve into
Gas mode, the poor sealing leakage solved present in traditional inlet valve is big, and compressor volumetric efficiency is low, and noise is big and air inlet
The problem of gap；By stem design at inverted T-type structure, and sealed bottom block is designed to hemisphere face or conical surface projection cube structure, ensures
It matches with the inner surface of air intake duct, forms sealing, and be process using PEEK non-metallic materials, make it at work,
The noise generated with valve body collision greatly reduces, to reduce the noise of compressor, the sealing block of valve rod and valve inner
The contact surface of air intake duct improves the leakproofness of the two contact surface, while the sealing block bottom of valve rod through overcure and bright and clean processing
Face in same level, can make compressor piston infinite approach plane in compressive state, will compress with valve body bottom surface
Clearance minimizes, and greatly improves volumetric efficiency, improves Energy Efficiency Ratio.
Description of the drawings
Fig. 1 is inlet valve overall structure diagram of the present invention；
Fig. 2 is that current tradition uses inlet valve structural schematic diagram；
Fig. 3 is the partial enlarged view of Fig. 2；
Fig. 4 is status architecture schematic diagram when inlet valve of the present invention opens work；
Fig. 5 is the structural schematic diagram of the embodiment of the present invention 1；
Fig. 6 is the structural schematic diagram of the embodiment of the present invention 2；
Wherein, 1 compressor compresses chamber, 2 valve plates, 3 valve rods, 31 motion bars, 32 sealing blocks, 4 elastic mechanisms, 41 first springs, 42
Second spring, 5 position-limit mechanisms, 51 first baffle rings, 52 second baffle rings, 6 valve bodies, 7 air intake ducts, 71 ventholes, 72 intercommunicating pores, 8 cylinders
Body, 9 pistons, 10 suction valve chips, 11 compressor valve boards, 12 exhaust valve plates, 13 exhaust screens.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without creative efforts
Embodiment shall fall within the protection scope of the present invention.
As Figure 1 and Figure 4, the invention discloses a kind of piston compressor inlet valves, including valve body 6, valve rod 3, air inlet
Road 7, elastic mechanism 4 and position-limit mechanism 5；The valve rod 3 is sleeved on inside valve body 6, and inside 3 bottom of valve rod and valve body 6 into
Air flue 7 seals, and can be moved up and down by elastic mechanism 4 and position-limit mechanism 5, and the elastic mechanism 4 is arranged in valve body 6 and valve rod
Between 3, the position-limit mechanism 5 is arranged is adapted position what any position or both at 6 top of 3 top of valve rod or valve body combined
It sets.
The embodiment advanced optimized is that the valve rod 3 is inverted T-type structure, and top is motion bar 31, and lower part is sealing block
32, and the vertical height of valve rod 3 is higher than the vertical height of valve body 6, the size of the sealing block 32 is adapted with air intake duct 7, institute
It states valve body 6 and is equipped with centre pilot compatible with valve rod 3 hole, center pilot hole is for keeping 3 upper and lower directions of valve rod to move, limit
The degree of freedom of 3 vertical direction of valve rod processed, the motion bar 31 is equipped at least one anti-card slot, when being used to prevent inlet valve long
Between work, the impurities accumulation in air and lead to 3 clamping stagnation of valve rod.
The embodiment advanced optimized is that the air intake duct 7 is the venthole 71 being arranged inside valve body 6, the venthole
71 are at least one, and 71 bottom of the venthole is intercommunicating pore 72, and the 32 size phase of sealing block of diameter and 3 bottom of valve rod
Adaptation.
It is hemisphere face or conical surface projection cube structure that the embodiment advanced optimized, which is the sealing block 32, sealing block 32 it is convex
Face matches with the inner surface of air intake duct 7, forms sealing；The lower plane of sealing block 32 is with the lower plane of valve body 6 in same plane.
The embodiment advanced optimized is that the elastic mechanism 4 is made of the first spring 41, and first spring 41 passes through
Position-limit mechanism 5 is fixed between valve rod 3 and valve body 6, is in compressive state or non-compressed state, when its inlet valve being made to work, valve rod 3
Moving up and down can seal and open and close with air intake duct 7.
The embodiment advanced optimized is that the internal or external of first spring 41 is additionally provided with second spring 42, described the
Two springs 42 are limit spring, and the elasticity modulus of second spring 42 is more than the first spring 41.
The embodiment advanced optimized is that the position-limit mechanism 5 is mainly made of the first baffle ring 51, first baffle ring 51
It is arranged at the top of valve rod 3, and is connected with elastic mechanism 4.
The embodiment advanced optimized is that the position-limit mechanism 5 is additionally provided with the second baffle ring 52, and second baffle ring 52 is arranged
At 6 top of valve body, for limiting fixed elastic mechanism 4.
The embodiment advanced optimized is that mutually fitting in the first baffle ring 51 or the second baffle ring 52 is arranged in first spring 41
It is arranged with position or simultaneously and is adapted position in the first baffle ring 51 or the second baffle ring 52, the second spring 42 is arranged second
Baffle ring 52 is adapted position.
The embodiment advanced optimized is that the valve body 6 uses metal material, the valve rod 3 to use nonmetallic polyether-ether-ketone
Material or nonmetallic polytetrafluoroethylene (PTFE) material or stainless steel, the elastic mechanism 4 and position-limit mechanism 5 use metal material.
As shown in figure 4, inlet valve is open state.Compressor air suction when descent of piston, in the upper and lower of valve rod cone part
Two sides generates pressure difference, and valve rod, which moves down, makes first conical surface and second conical surface gap occur, and thus gap enters compressor to air
In compression chamber；Piston stroking upward air is compressed after compressor air suction, and valve rod is multiple under elastic mechanism and gas pressure effect
Position, at this moment first conical surface and the fitting of second conical surface, play the role of seal compression gas.
In conclusion in compressor operating state, which repeats to open and close movement.Air-breathing when compressor operating
Although valve frequently opens and closes, because valve rod is small, material is nonmetallic polyether-ether-ketone, and light weight inertia is small, collides and produces with valve seat
Raw noise is greatly reduced, to reduce the noise of compressor complete machine.The sealing surface of valve body and valve rod is hardening and bright and clean place
It manages, the good airproof performance leakage between sealing surface is small；It closes rear valve body and valve rod lower plane is in same level, so compressor
Volumetric efficiency is high.
Embodiment 1
As shown in figure 5, the embodiment is this programme most preferred embodiment, mainly by valve rod, the first spring, second spring, first gear
Circle, valve body and the second baffle ring composition.Its valve rod uses nonmetallic polyether-ether-ketone, and intensity, toughness and fatigue durability ensure that
The noise of the opening and closing of inlet valve is small and service life is long.It assembles with valve body central communication hole and is tightly connected, and carries out up and down reciprocatingly
Movement.The sealing convex surface of itself and valve body cooperation, has carried out bright and clean processing, and roughness reaches Ra0.4, ensure that good sealing property
Energy.
Elastic mechanism is made of the first spring and second spring, is all made of stainless steel and is made, the first spring dress
Compressive state is in after matching；The elasticity modulus of second spring is more than the first spring, and at air-breathing valve closing state second spring
In the state of not stressing；When inlet valve fully open state, second spring is in micro- compressive state.First baffle ring is fixed on valve rod
Top is equipped with the first spring below, and the second baffle ring is fixed on body top, and valve plate is fixed on for auxiliary valve body.
Valve body material is copper alloy, is Multiple-Aperture Device, intercommunicating pore and carries out bright and clean processing with the valve rod fitted seal conical surface.
Its venthole is in this implementation case row, in the case of inlet valve fully opens, ensures that ventilatory capacity is at pressure difference 0.02Mpa
0.4m³/min.When inlet valve completely closed state or its sealing surface of seat of compressor off position and valve stem seal face are complete
Fitting, valve seat lower plane and valve rod lower plane are in same plane.
The embodiment makes compressor in the case where air-breathing starts and be vented two states of end, and piston can be inhaled with infinite approach
Air valve lower plane makes compression clearance close to 0, greatly improves volumetric efficiency, improves Energy Efficiency Ratio.The inlet valve is good past
Multiple movenent performance and minimum air suction and noise play the function of energy-saving and noise-reducing in practical applications.
Embodiment 2
As shown in fig. 6, the present embodiment is mainly by valve plate, valve rod, elastic mechanism（Spring）, position-limit mechanism（Baffle ring）Composition.Valve plate
It is connected with valve rod assembly, centre has spring auxiliary valve rod to move up and down, and baffle ring is fixed on valve rod.
Valve plate material is steel, and the pedestal of inlet valve is simultaneously the upper valve plate of compressor compresses chamber, certain thickness to have
Porous flat plate, lower planes and the sealing surface coordinated with valve rod and mesoporous do bright and clean processing, ensure leakproofness and reduce to move to rub
It wipes.The sealing surface of the valve plate and valve rod is at spherical surface, uniform force, good airproof performance.
Valve rod material is 06Cr19Ni10 stainless steels, and valve stem seal face is spherical surface, is coordinated by spring and valve plate centre bore, valve
Bar moves up and down.
Spring materials are stainless steel, and valve plate is fixed on spring top, and lower part fixes valve rod, plays the role of tension spring.
Baffle ring material is stainless steel, is fixed on valve rod, when being inlet valve fully open state, the limit of valve rod.
Above-described embodiment is verified by implementing, and the relatively conventional inlet valve compressor of efficiency improves 20~30%, energy saving 30%
More than, according to《GB19153-2009 positive displacement compressors energy efficiency market and efficiency grade》, Energy Efficiency Ratio reached level-one efficiency
Standard.Piston compressor volumetric efficiency reaches 89.5%, and lower noise has arrived 70dB.
Claims (10)
1. a kind of piston compressor inlet valve, it is characterised in that：Including valve body（6）, valve rod（3）, air intake duct（7）, elastic machine
Structure（4）And position-limit mechanism（5）；The valve rod（3）It is sleeved on valve body（6）Inside, and valve rod（3）Bottom and valve body（6）Internal
Air intake duct（7）Sealing, and pass through elastic mechanism（4）With position-limit mechanism（5）It can move up and down, the elastic mechanism（4）Setting exists
Valve body（6）With valve rod（3）Between, the position-limit mechanism（5）It is arranged in valve rod（3）Top or valve body（6）Any position at top
Or both combine be adapted position.
2. a kind of piston compressor inlet valve according to claim 1, it is characterised in that：The valve rod（3）For inverted T shaped knot
Structure, top are motion bar（31）, lower part is sealing block（32）, and valve rod（3）Vertical height be higher than valve body（6）Vertical height
Degree, the sealing block（32）Size and air intake duct（7）It is adapted, the valve body（6）It is equipped with and valve rod（3）Compatible center
Pilot hole.
3. a kind of piston compressor inlet valve according to claim 1, it is characterised in that：The air intake duct（7）To set
It sets in valve body（6）Internal venthole（71）, the venthole（71）At least one, the venthole（71）Bottom is connection
Hole（72）, and and valve rod（3）The sealing block of bottom（32）Size is adapted.
4. a kind of piston compressor inlet valve according to claim 2 or 3, it is characterised in that：The sealing block（32）
For hemisphere face or conical surface projection cube structure, sealing block（32）Upper convex surface and air intake duct（7）Inner surface match, formed sealing；
Sealing block（32）Lower plane and valve body（6）Lower plane in same plane.
5. a kind of piston compressor inlet valve according to claim 1, it is characterised in that：The elastic mechanism（4）By
First spring（41）Composition, first spring（41）Pass through position-limit mechanism（5）It is fixed on valve rod（3）With valve body（6）Between, make
When its inlet valve works, valve rod（3）Move up and down energy and air intake duct（7）Sealing and folding.
6. a kind of piston compressor inlet valve according to claim 5, it is characterised in that：First spring（41）'s
It is internal or external to be additionally provided with second spring（42）, the second spring（42）For limit spring, and second spring（42）Elasticity
Modulus is more than the first spring（41）.
7. a kind of piston compressor inlet valve according to claim 1, it is characterised in that：The position-limit mechanism（5）It is main
It will be by the first baffle ring（51）Composition, first baffle ring（51）It is arranged in valve rod（3）Top, and and elastic mechanism（4）Cooperation
Connection.
8. a kind of piston compressor inlet valve according to claim 7, it is characterised in that：The position-limit mechanism（5）Also
Equipped with the second baffle ring（52）, second baffle ring（52）It is arranged in valve body（6）Top, for limiting elastic mechanism（4）.
9. a kind of piston compressor inlet valve according to claim 5 to 8 any one, it is characterised in that：Described
One spring（41）It is arranged in the first baffle ring（51）Or second baffle ring（52）Be adapted position or be arranged simultaneously in the first baffle ring
（51）Or second baffle ring（52）Be adapted position, the second spring（42）It is arranged in the second baffle ring（52）Be adapted position
It sets.
10. a kind of piston compressor inlet valve according to claim 1, it is characterised in that：The valve body（6）Using gold
Belong to material, the valve rod（3）Using nonmetallic polyether-ether-ketone material or nonmetallic polytetrafluoroethylene (PTFE) material or stainless steel, institute
State elastic mechanism（4）And position-limit mechanism（5）Using metal material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810521394.3A CN108506192A (en) | 2018-05-28 | 2018-05-28 | A kind of piston compressor inlet valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810521394.3A CN108506192A (en) | 2018-05-28 | 2018-05-28 | A kind of piston compressor inlet valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108506192A true CN108506192A (en) | 2018-09-07 |
Family
ID=63401454
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810521394.3A Pending CN108506192A (en) | 2018-05-28 | 2018-05-28 | A kind of piston compressor inlet valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108506192A (en) |
-
2018
- 2018-05-28 CN CN201810521394.3A patent/CN108506192A/en active Pending
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Application publication date: 20180907 |
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