CN106838386A - It is a kind of can on-line maintenance axial flow type check valve - Google Patents
It is a kind of can on-line maintenance axial flow type check valve Download PDFInfo
- Publication number
- CN106838386A CN106838386A CN201710128793.9A CN201710128793A CN106838386A CN 106838386 A CN106838386 A CN 106838386A CN 201710128793 A CN201710128793 A CN 201710128793A CN 106838386 A CN106838386 A CN 106838386A
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- Prior art keywords
- valve
- valve element
- flap
- axis
- flow type
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- 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.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K15/00—Check valves
- F16K15/02—Check valves with guided rigid valve members
- F16K15/06—Check valves with guided rigid valve members with guided stems
- F16K15/063—Check valves with guided rigid valve members with guided stems the valve being loaded by a spring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/36—Valve members
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
- F16K27/0209—Check valves or pivoted valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/12—Covers for housings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K47/00—Means in valves for absorbing fluid energy
- F16K47/02—Means in valves for absorbing fluid energy for preventing water-hammer or noise
Abstract
The invention discloses it is a kind of can on-line maintenance axial flow type check valve, it is characterized in that：Valve body top set open top, core assembly be in valve body is inserted in open top position, and in the open top of valve body set bonnet valve body is closed；Core assembly is that valve element is suspended on valve element support using brace rod, and valve element support is fixed at the open top position of valve body using valve element fixing clasp.Flow resistance of the present invention is small, low noise, is capable of achieving on-line maintenance.
Description
Technical field
It is more specifically a kind of the present invention relates to apply the check-valves in the fields such as petrochemical industry, natural gas, nuclear power
Flow the valve for automatically turning on or closing in itself by medium, be mainly used to meet the axial-flow type of requirement of the system to medium back flow
Check-valves.
Background technology
In order to protect the safe operation of compressor or pump, typically being set in compressor or pump discharge prevents stopping for medium refluence
Return valve.Common swing type, dual plate check valve, its flap often exist can not open completely, cause media flow it is unstable,
The problems such as pressure loss is big, noise is big, so as to influence the normal operation of large-scale compressor or pump, axial flow type check valve is because of its structure
The characteristic such as feature and good negotiability, low pressure loss, good water impact preventing ability can well solve this and ask
Topic.
There are two kinds of axial flow type check valves of different structure form at present, one kind is disc valve flap structure axial-flow type non-return
Valve, its valve body is integral casting forming, and flap is arc single valve clack, is connected with valve rod, is made under medium effect and spring effect
Open and close motion；Another kind is annular, also known as the ring disk shape flap axial flow type check valve, valve body is similarly monoblock cast, and flap is
Ring disk-shaped structure, sealing surface is inside and outside ring, double sealing form, and flap is quick condition, is made by three or four prerotation vanes
Support, makees to open and close motion under medium effect and spring effect.In Practical Project, the check-valves of both structure types is all obtained
It is widely applied, but simultaneously there are the following problems：
One is small-bore axial flow type check valve during disc-shaped structure is generally only applicable, because with the increase of bore,
The weight of circular flap can be greatly increased, the simple guides stem by behind flap come support opening/shutting valve be it is highly difficult,
Although some manufacturing firms also increase stem guiding to solve in large bore valves design on front side of disc flap,
But the increased stem guiding on front side of flap, its corresponding supporting construction can influence the negotiability of valve, while this kind of structure
In flap closing process, it may occur that strong collision, loud noise is produced, have a strong impact on the service life of valve.
Two is annular axial flow type check valve because its sealing surface is inside and outside ring design, and flap is shaped as ring disk-shaped structure, receives
Power situation is improved so that flap thickness is less than 1/3rd of other type axial flow type check valve flap thickness, and flap is thick
Degree mitigates significantly, especially for more notable for large bore valves, but because its flap is in quick condition, without accurately
Guiding, and sealing surface uses double containment, is not enough to rapidly to form certain impact to flap in medium back flow and produces enough
Seal pressure when, valve is often leaked, while in actual use, the flap of the structure type is by one or two
Prerotation vane is supported, during the long-term valve opening and closing, easily fatigue rupture and be broken, there is great potential safety hazard.
Three is the axial flow type check valve for being applied in Larger Engineering Projects, especially heavy-caliber axial flow type check valve, is led to
Often the mounting means with pipeline uses welding connecting mode, once leakage or parts damages occurs in valve to need to change part or close
During sealing, for axial flow type check valve of the prior art, it is necessary to by valve integrally get off from pipe cutting, then carry out maintenance and
Change, huge economic loss will certainly be caused.
Practice have shown that, although axial flow type check valve of the prior art respectively has advantage, also all there is greatly safety hidden
Suffer from, once leakage occurs in valve, huge economic loss will certainly be caused to whole engineering project.
The content of the invention
The present invention is to avoid the deficiency existing for above-mentioned prior art, there is provided a kind of flow resistance is small, low noise can be online
The axial flow type check valve of maintenance, to ensure sealed reliable, meets requirement of the system to medium back flow, it is ensured that the quality of engineering project
And safety.
The present invention is adopted the following technical scheme that to solve technical problem：
The present invention can the axial flow type check valve of on-line maintenance be structurally characterized in that：At the top of valve body, open top is set,
Core assembly be in valve body is inserted in open top position, and in the open top of valve body set bonnet enable the valve body
Closing；The core assembly is that valve element is suspended on valve element support using brace rod, and the valve element support is fixed using valve element
Snap ring is fixed at the open top position of valve body.
The present invention can the design feature of axial flow type check valve of on-line maintenance lie also in：The core assembly is included in valve element
The flap that is supported using the helical spring of valve rod and the periphery for being sleeved on valve rod of front end, be arranged with guiding in parallel with the valve rod
Axle, the valve rod and the axis of guide are slidably matched with the valve rod axis hole and axis of guide axis hole being arranged in valve element correspondingly, make
The flap can realize valve opening, and answering using helical spring under pressure medium to the axial movement of valve element side
The flap is carried out closing to runner under position and medium back flow collective effect and realize non-return.
The present invention can the design feature of axial flow type check valve of on-line maintenance lie also in：In the valve element, positioned at valve rod
Afterbody damping hole is set, disk spring is placed in the damping hole, and using damping slide block as the spring base of disk spring,
The damping slide block is fixedly installed on the tail end of valve rod, and damping slide block is to be slidably matched with damping hole.
The present invention can the design feature of axial flow type check valve of on-line maintenance lie also in：On the front end edge of the valve element support
Fabrication hole is radially arranged, the arcuate front ends face of the flap can be butted on through the fabrication hole using frock, make the flap
Given up the throne towards valve element side.
The present invention can the design feature of axial flow type check valve of on-line maintenance lie also in：Valve rod axis hole in the valve element
In the first sliding shaft sleeve is fixedly installed, the valve rod is slidably matched with first sliding shaft sleeve；In the axis of guide of the valve element
The second sliding shaft sleeve is fixedly installed in axis hole, the axis of guide is slidably matched with second sliding shaft sleeve.
Compared with the prior art, the most significant achievement of the present invention is embodied in：
1st, axial flow type check valve of the present invention can realize on-line maintenance or maintenance；
2nd, the present invention sets combination butterfly spring and damping slide block using spool end, can effectively mitigate flap and valve body valve
Impact between seat, reduces noise, while backflow requirement of the system to medium can at any time be met by adjusting buffer gap；
3rd, the present invention further realizes the accurate guiding of flap using the axis of guide is set between flap and valve element, it is ensured that
Seal request between flap and valve seat, while on the premise of valve negotiability is not influenceed, it is to avoid flap is in opening-closing process
In independent bending load flap weight being born by valve rod and is caused, the reliability of valve is improved, especially to heavy caliber axle stream
Formula check-valves effect is more significantly.
Brief description of the drawings
Fig. 1 is schematic structural view of the invention；
Fig. 2 is core assembly vertical section structural representation in the present invention；
Fig. 3 is core assembly sectional schematic diagram in the present invention；
Label in figure：1 flap, 2 axis of guides, 3 helical springs, 4 second sliding shaft sleeves, 5 valve elements, 6 first sliding shaft sleeves, 7
Valve rod, 8 disk springs, 9 brace rods, 10 damping slide blocks, 11 valve element supports；12 fabrication holes, 13 bonnets, 14 valve element fixing clasps,
15 valve bodies, 16 core assemblies.
Specific embodiment
Referring to Fig. 1, Fig. 2 and Fig. 3, in the present embodiment can the structure type of axial flow type check valve of on-line maintenance be：In valve
The top of body 15 sets open top, and core assembly 16 is in valve body 15 is inserted in open top position, and on the top of valve body 15
Bonnet 13 is set on portion opening enables valve body 15 to close；Core assembly 16 is that valve element 5 is suspended on into valve element branch using brace rod 9
On frame 11, valve element support 11 is fixed at the open top position of valve body 15 using valve element fixing clasp 14.
In specific implementation, corresponding structure type also includes：
Core assembly 16 is included in the front end of valve element 5 using valve rod 7 and the helical spring 3 of the periphery for being sleeved on valve rod 7
The flap 1 of support, the axis of guide 2 is arranged with parallel with valve rod 7, valve rod 7 and the axis of guide 2 correspondingly be arranged in valve element 5
Valve rod axis hole and axis of guide axis hole are slidably matched, and flap 1 is moved axially to the side of valve element 5 under pressure medium real
Flap 1 is set to carry out closing realization to runner under existing valve opening, and reset using helical spring 3 and medium back flow collective effect
Non-return.Ensure that flap 1 does not deviate in movement travel, is further ensured that valve under collective effect of the axis of guide 2 with valve rod 7
Seal request between valve and valve seat, meanwhile, flap 1 can be prevented effectively from flap is individually born by valve rod 7 in opening-closing process
Weight and the bending load that causes, improve the reliability of valve.
In order to ensure the reliable in action of flap 1, dexterity of action is improved, the is fixedly installed in the valve rod axis hole in valve element 5
One sliding shaft sleeve 6, valve rod 7 is slidably matched with the first sliding shaft sleeve 6；The second cunning is fixedly installed in the axis of guide axis hole of valve element 5
Moving axis set 4, the axis of guide 2 is slidably matched with the second sliding shaft sleeve 4, and the first sliding shaft sleeve 6 and the second sliding shaft sleeve 4 play lubrication
Effect.
In the present embodiment, in valve element 5, the afterbody positioned at valve rod 7 sets damping hole, and disk spring is placed in damping hole
8, and using damping slide block 10 as the spring base of disk spring 8, damping slide block 10 is fixedly installed on the tail end of valve rod 7, damping is slided
Block 10 is to be slidably matched with damping hole.
In order to implement online dismounting, fabrication hole 12 is disposed radially in the front end of valve element support 11, work is run through using frock
Skill hole 12 can be butted on before the arc of flap 1, flap 1 is given up the throne towards the side of valve element 5.
As shown in Fig. 2 during assembling, the first sliding shaft sleeve 6 and the second sliding shaft sleeve 4 are fixed in valve element 5, by valve rod 7
And the axis of guide 2 screws in flap 1, then successively by helical spring 3, and the loading valve element 5 of flap 1 for being provided with valve rod 7 and the axis of guide 2
In, the axis of guide 2 is slidably matched with the first sliding shaft sleeve 4, valve rod 7 is slidably matched with the second sliding shaft sleeve 6, then in valve rod 7
Afterbody butterfly spring 8 and damping slide block 10 be installed successively constitute core assembly 16；Valve flowing channel has been assembled by valve body with valve element
It is collectively forming after, runner can as needed be designed to venturi shape or other any shapes, bonnet is designed according to pressure rating
Into self-tightening sealing form or spacer bolt form.
As shown in figure 1, when core assembly 16 is loaded into valve body, using frock, by the fabrication hole on valve element support 11
12, promote flap 1 to be drawn close to valve element 5, until core assembly 16 smoothly can load from the top of valve body 15, then fill successively again
Enter valve element fixing clasp 14, bonnet 13.
When valve is installed on pipeline needs repairing replacing parts, bonnet 13 and valve element fixing clasp are removed successively
14, using frock, by the fabrication hole 12 on valve element support 11, promote flap 1 to be drawn close to valve element 5, until can be by valve element group
Part 16 smoothly takes out from the top of valve body 15.
Axial flow type check valve of the present invention in working order when, when compressor before valve or pump are started working, flap 1 can compared with
Just it is open under low pressure medium, in the case of smaller droop loss, medium can pass through valve body 15 and 5 shapes of valve element
Into passage；When compressor before valve or pump are stopped, flap 1 is flow backwards under percussion in helical spring 3 and medium, rapidly
Close, under valve rod 7 and the collective effect of the axis of guide 2, it is accurately positioned, realize reliable sealing, meanwhile, set by valve rod afterbody
Butterfly spring 8 and damping slide block 10 mitigate impact of the flap 1 to valve body and valve seat, effectively reduce the noise that flap impact is produced,
Improve the service life of valve.Damping depth can in good time be adjusted according to engineering project, i.e., when system is required to medium back flow,
Buffer gap can be as needed designed, to meet backflow requirement of the system to medium, when system requirements medium back flow zero leakage,
Also dependent on need ensure seal request.
Axial flow type check valve sealed reliable of the present invention, meets requirement of the system to medium back flow at any time, and flow resistance is small, low noise
Sound, at the same can realize can on-line maintenance function, ensure engineering project quality safety on the premise of, engineering is reduced to greatest extent
Loss risk.
Claims (5)
1. it is a kind of can on-line maintenance axial flow type check valve, it is characterized in that：At the top of valve body (15), open top, valve element are set
Component (16) be in valve body (15) is inserted in open top position, and in the open top of valve body (15) set bonnet (13) make
The valve body (15) is closed；The core assembly (16) is that valve element (5) is suspended on into valve element support using brace rod (9)
(11) on, the valve element support (11) is fixed at the open top position of valve body (15) using valve element fixing clasp (14).
2. it is according to claim 1 can on-line maintenance axial flow type check valve, it is characterized in that：Core assembly (16) bag
The flap (1) using helical spring (3) support of valve rod (7) and the periphery for being sleeved on valve rod (7) in the front end of valve element (5) is included,
Be arranged with the axis of guide (2) in parallel with the valve rod (7), the valve rod (7) and the axis of guide (2) correspondingly be arranged on valve element
(5) valve rod axis hole and axis of guide axis hole in are slidably matched, and make the flap (1) can be to valve element (5) institute under pressure medium
In side, valve opening is realized in axial movement, and is made under reset using helical spring (3) and medium back flow collective effect described
Flap (1) carries out closing and realizes non-return to runner.
3. it is according to claim 2 can on-line maintenance axial flow type check valve, it is characterized in that：In the valve element (5), position
In valve rod (7) afterbody set damping hole, in the damping hole place disk spring (8), and using damping slide block (10) as
The spring base of disk spring (8), the damping slide block (10) is fixedly installed on the tail end of valve rod (7), damping slide block (10) and resistance
Buddhist nun hole is to be slidably matched.
4. it is according to claim 2 can on-line maintenance axial flow type check valve, it is characterized in that：In the valve element support (11)
Front end be disposed radially fabrication hole (12), the arc of the flap (1) can be butted on through the fabrication hole (12) using frock
Shape front end face, makes the flap (1) be given up the throne towards valve element (5) side.
5. it is according to claim 2 can on-line maintenance axial flow type check valve, it is characterized in that：In the valve element (5)
The first sliding shaft sleeve (6) is fixedly installed in valve rod axis hole, the valve rod (7) is slidably matched with first sliding shaft sleeve (6)；
The second sliding shaft sleeve (4) is fixedly installed in the axis of guide axis hole of the valve element (5), the axis of guide (2) is slided with described second
Axle sleeve (4) is slidably matched.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710128793.9A CN106838386B (en) | 2017-03-06 | 2017-03-06 | It is a kind of can on-line maintenance axial flow type check valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710128793.9A CN106838386B (en) | 2017-03-06 | 2017-03-06 | It is a kind of can on-line maintenance axial flow type check valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106838386A true CN106838386A (en) | 2017-06-13 |
| CN106838386B CN106838386B (en) | 2019-10-29 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710128793.9A Active CN106838386B (en) | 2017-03-06 | 2017-03-06 | It is a kind of can on-line maintenance axial flow type check valve |
Country Status (1)
| Country | Link |
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| CN (1) | CN106838386B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107701739A (en) * | 2017-11-20 | 2018-02-16 | 北京航天动力研究所 | A kind of multilayer complex casing and housing unit |
| CN108612883A (en) * | 2018-07-09 | 2018-10-02 | 君品集团有限公司 | Check-valves |
| CN108869808A (en) * | 2018-08-22 | 2018-11-23 | 上海冠龙阀门自控有限公司 | A kind of shaftless floating guiding valve |
| CN109958799A (en) * | 2017-12-25 | 2019-07-02 | 重庆昂宇自控仪表有限公司 | A kind of axial flow type check valve |
| CN111761302A (en) * | 2020-05-29 | 2020-10-13 | 江苏神通阀门股份有限公司 | Technological method of cryogenic axial flow check valve with online maintenance function |
| CN112020623A (en) * | 2018-04-23 | 2020-12-01 | 戴科知识产权控股有限责任公司 | Check valve insert defining an open position and check valve having a check valve insert |
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| US3605802A (en) * | 1968-11-02 | 1971-09-20 | Itt | Check valve |
| CN202790713U (en) * | 2012-09-08 | 2013-03-13 | 环球阀门集团有限公司 | Noise elimination check valve |
| CN203322402U (en) * | 2013-06-24 | 2013-12-04 | 特技阀门集团有限公司 | Axial-flow check valve |
| CN204592433U (en) * | 2015-04-01 | 2015-08-26 | 上海阀门厂有限公司 | A kind of on-line maintenance structure of axial flow type check valve |
| CN205118348U (en) * | 2015-11-09 | 2016-03-30 | 五洲阀门有限公司 | Axial compressor check valve |
| CN105864469A (en) * | 2016-04-26 | 2016-08-17 | 苏州纽威阀门股份有限公司 | Axial-flow type check valve capable of replacing internal part on line |
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2017
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3605802A (en) * | 1968-11-02 | 1971-09-20 | Itt | Check valve |
| CN202790713U (en) * | 2012-09-08 | 2013-03-13 | 环球阀门集团有限公司 | Noise elimination check valve |
| CN203322402U (en) * | 2013-06-24 | 2013-12-04 | 特技阀门集团有限公司 | Axial-flow check valve |
| CN204592433U (en) * | 2015-04-01 | 2015-08-26 | 上海阀门厂有限公司 | A kind of on-line maintenance structure of axial flow type check valve |
| CN205118348U (en) * | 2015-11-09 | 2016-03-30 | 五洲阀门有限公司 | Axial compressor check valve |
| CN105864469A (en) * | 2016-04-26 | 2016-08-17 | 苏州纽威阀门股份有限公司 | Axial-flow type check valve capable of replacing internal part on line |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107701739A (en) * | 2017-11-20 | 2018-02-16 | 北京航天动力研究所 | A kind of multilayer complex casing and housing unit |
| CN107701739B (en) * | 2017-11-20 | 2024-04-09 | 北京航天动力研究所 | Multilayer complex shell and shell assembly |
| CN109958799A (en) * | 2017-12-25 | 2019-07-02 | 重庆昂宇自控仪表有限公司 | A kind of axial flow type check valve |
| CN112020623A (en) * | 2018-04-23 | 2020-12-01 | 戴科知识产权控股有限责任公司 | Check valve insert defining an open position and check valve having a check valve insert |
| CN112020623B (en) * | 2018-04-23 | 2023-08-15 | 戴科知识产权控股有限责任公司 | Check valve insert defining an open position and check valve having a check valve insert |
| CN108612883A (en) * | 2018-07-09 | 2018-10-02 | 君品集团有限公司 | Check-valves |
| CN108869808A (en) * | 2018-08-22 | 2018-11-23 | 上海冠龙阀门自控有限公司 | A kind of shaftless floating guiding valve |
| CN111761302A (en) * | 2020-05-29 | 2020-10-13 | 江苏神通阀门股份有限公司 | Technological method of cryogenic axial flow check valve with online maintenance function |
| CN111761302B (en) * | 2020-05-29 | 2022-01-25 | 江苏神通阀门股份有限公司 | Technological method of cryogenic axial flow check valve with online maintenance function |
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| Publication number | Publication date |
|---|---|
| CN106838386B (en) | 2019-10-29 |
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Address after: 230031 Hefei Changjiang Road, Shushan District, Anhui, No. 888 Patentee after: Hefei General Machinery Research Institute Co., Ltd. Address before: 230031 Hefei Changjiang Road, Shushan District, Anhui, No. 888 Patentee before: Hefei General Machinery Research Institute |