CN101037992A - Fine vacuum diaphragm pump - Google Patents
Fine vacuum diaphragm pump Download PDFInfo
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- CN101037992A CN101037992A CN 200710090961 CN200710090961A CN101037992A CN 101037992 A CN101037992 A CN 101037992A CN 200710090961 CN200710090961 CN 200710090961 CN 200710090961 A CN200710090961 A CN 200710090961A CN 101037992 A CN101037992 A CN 101037992A
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Abstract
The invention relates to a high-vacuum diaphragm pump, stabilizing vacuum environment when the diaphragm pump is sucking hydraulic fluid and supplying pressure requirement when discharging hydraulic fluid, which comprises a cylinder body and a oil pool cylinder. The cylinder body is provided with a pressure-fluid inlet valve and an outlet valve, the diaphragm and a support bracket are provided between them, the said piston presents a echelonment shape, the oil pool cylinder communicates with a cavum between the piston and the piston cavity via a compensator valve, the cavum between the piston and the piston cavity communicates with the diaphragm oil pressure cavity via a pressure control valve. The invention can ensure reliability service of the pump while state of stable fine vacuum suction ability is maintained.
Description
Technical field
The present invention relates to high self-priming diaphragm metering pump, be suitable for diaphragm metering pump, large hydraulic diaphragm pump.
Technical background
In the prior art, the fluid end of hydraulic driving diaphragm pump is spaced apart process fluid and hydraulic fluid with barrier film, and there is not leakage phenomenon, therefore have wide range of applications, but because the distortional stress of barrier film own is too big, diaphragm material can be made with materials such as PTFE, synthetic rubber and stainless steels, and the hydrodynamic that needs to consume can be just many.Compare with the plunger type fluid end, it is big that the entrance friction of hydraulic driving diaphragm metering pump becomes, the operating mode poor to suction condition, that fluid viscosity is big, temperature is high be consumed in barrier film because hydraulic pressure cavity sucks the portion of energy of vacuum state, thereby diaphragm metering pump suction capacity difference should have the pressure of pouring in down a chimney usually.When diaphragm metering pump occurs when unusual, may be make due to the pump generation cavitation because of device and pipe parameter change, as the on-the-spot used diaphragm metering pump of petrochemical plant, medium temperature height, the powdery fine grained that often occur through using for many years that flow wretched insufficiency, medium are easily vaporized, occurs during the termination of pumping recurrence in the pumping cylinder are concentrated at the valve port place and are caused not smooth phenomenon etc.
The necessary NPSH of common given metering pump is a definite value, but this definite value will be along with using and changing easily damaged parts and may change.Because containing solid particle, pumped medium diameter of conveying pipe is diminished relatively or medium temperature raises and to cause the device net positive suction head to reduce; Add that high temperature media easily vaporizes, be lower than the medium pressure for vaporization to cause the pump chamber internal pressure, mercury vapour erosion performance is descended significantly, the possibility that makes pump produce cavitation also can increase considerably.
Easily problem such as obstruction of row pressure and instability of flow, the easy cavitation of pump, terminal valve group and passage appears in the used diaphragm metering pump of petrochemical plant, and by to all being the technical problem that enterprise and scientific research department must solve in the issuable cavitation problem of specific operation lower inlet hypotony.
In the existing diaphragm metering pump, barrier film is fixed on feed liquor in the pump housing by support, in the cavity between the liquid outlet, when being positioned at the reciprocating motion of the pistons of its side, the drive barrier film moves, thereby at feed liquor, form the environment of vacuum feed liquor and pressure discharge opeing between the liquid outlet, because liquid entering hole one end of recuperation valve is communicated with the submergence chamber of piston, liquid outlet one end is communicated with cavity between barrier film and the piston, when outwards moving to make, piston forms suitable vacuum between barrier film and the piston like this, hydraulic fluid to be measured enters pump chamber, the process fluid that will occur this moment in the submergence cavity enters the cavity between barrier film and the piston through recuperation valve and destroys the vacuum environment that forms therebetween, thereby has a strong impact on the efficient of diaphragm metering pump, the reliability of stability and metering.
Summary of the invention
Purpose of the present invention just provides a kind of fine vacuum diaphragm pump, and the pressure demand when vacuum environment when stablizing diaphragm pump inhalant liquid hydraulic fluid and timely supply released liquor hydraulic fluid is improved and also improved pump maintainability and anti-cavitation performance.
For achieving the above object, the technical solution used in the present invention is: fine vacuum diaphragm pump, comprise cylinder body and oil sump cylinder, piston is positioned at cylinder body, the piston rod of piston is positioned at the oil sump cylinder and by the process fluid submergence, the cylinder body that is positioned at piston one side is provided with pressure fluid feed liquor valve and liquid valve, barrier film and fixed support thereof are set therebetween, it is characterized in that: described piston is stepped, the piston cavity that cooperates with described piston is arranged in the cylinder body, being equipped with piston ring on each diameter section of described piston cooperates with the piston cavity of corresponding section, also be provided with recuperation valve and oil pressure adjusting control valve on the described cylinder body, the cavity unilaterally connected of oil sump cylinder between recuperation valve and piston and piston cavity, the cavity between piston and the piston cavity is through oil pressure adjusting control valve and barrier film oil pressure chamber unilaterally connected.
In technique scheme, on principle, adopt the low linear velocity design proposal of diaphragm metering pump, strengthen the diaphragm stroke volume and reduce pump speed, specifically exactly plunger designs is become stepped shaft, under the suction situation, promptly when one lateral movement of oil sump cylinder, the volume between piston and the barrier film strengthens piston backward, produce vacuum and make recuperation valve open the hydraulic oil that sucks in the oil sump cylinder, this moment, the diaphragm cavity part still kept high vacuum state; Under the state that adds auxiliary hydraulic control valve, when piston is to diaphragm cavity one lateral movement when discharging, be compressed by the cavity between stair-stepping piston and the piston cavity, hydraulic control valve is opened rapidly, the diaphragm cavity part is full of fully, the hydro-cushion of barrier film both sides makes pump realize reliable operation under the state of the stable high vacuum inlet capacity of maintenance.Invention provides a kind of reliable high self-priming diaphragm metering pump, and product can satisfy high reliability, anti-cavitation performance, volume compact, is suitable for the special usage requirement of chemical field; Adopt cascade piston, improvement Gassy Relief Valve, oily immersion type compensation scheme can improve the anti-cavitation performance of diaphragm metering pump.
Summary of drawings
Fig. 1 is a structural representation of the present invention;
The mated condition schematic representation of piston and piston cylinder when Fig. 2 is suction;
Embodiment
As shown in Figure 1, fine vacuum diaphragm pump disclosed by the invention, comprise cylinder body 10 and oil sump cylinder 20, piston 30 is positioned at cylinder body 10, the piston rod 31 of piston 30 is positioned at oil sump cylinder 20 and by the process fluid submergence, the cylinder body 10 that is positioned at piston 30 1 sides is provided with pressure fluid feed liquor valve 40 and liquid valve 50, barrier film 60 and fixed support 70 thereof are set therebetween, described piston 30 is stepped, the piston cavity that cooperates with described piston 30 is arranged in the cylinder body 10, being equipped with piston ring on each diameter section of described piston 30 cooperates with the piston cavity of corresponding section, also be provided with recuperation valve 80 and oil pressure adjusting control valve 90 on the described cylinder body 10, the cavity unilaterally connected of oil sump cylinder 20 between recuperation valve 80 and piston 30 and piston cavity, the cavity between piston 30 and the piston cavity is through oil pressure adjusting control valve 90 and barrier film oil pressure chamber 61 unilaterally connecteds.In conjunction with Fig. 2, be inlaid with cylinder sleeve 11 in the cylinder body 10, cylinder sleeve 11 internal cavities constitute the piston cavity that cooperates with piston ring 32.
In conjunction with Fig. 1,2, the membrane pump fluid end hydraulic diaphragm driving structure of cascade piston structure has been adopted in invention.This structure improvement diaphragm pump high vacuum suction condition.In suction process, by the to-and-fro motion of cascade piston 30, force barrier film 60 to piston 30 1 side shiftings, in hydraulic pressure cavity, produce high vacuum and suck a certain amount of hydraulic oil and deposit in the cavity 111 between piston 30 and the piston cavity via recuperation valve 80; In discharge process, cavity 111 is discharged hydraulic oil to barrier film oil pressure chamber 61 through oil pressure adjusting control valve 90, and keeps kinetic pressure balancing state, deflation over-flow valve 100 collaborative works in this process.So, try one's best fully, be sent in the pump chamber constantly by the condition of high vacuum degree that moves generation behind the piston 30.The mechanically deformation of barrier film, poorly sealed etc. all can reduce the degree of vacuum value, should consider to compensate the circulation and the equilibrium problem of oil mass during the structural design of this product.The status condition that high vacuum sucks is the harsh requirement unconventional to diaphragm pump, keeps normal operation under promptly requiring in pump chamber medium degree of vacuum extremely near the situation of pressure for vaporization.Conventional diaphragm metering pump of the prior art can't guarantee usage requirement at all, and diaphragm pump disclosed by the invention can realize that the present invention is very remarkable to the raising effect of the suction performance of diaphragm metering pump product.
Described piston 30 is that two-segment type is stepped, and its smaller diameter end is positioned at barrier film oil pressure chamber 61 1 sides.Cavity 111 between piston 30 and the piston cavity in fact be exactly at piston 30 under oil sump cylinder 20 1 side shifting states, the zone of encircling a city between the piston cavity that cooperates with the enlarged diameter section of piston 30 and the reduced diameter section of piston 30.The diameter of the big small piston of described piston 30 is 1.01---1.05 than D/d, selects the cascade piston of this ratio can satisfy the actual requirement of general diaphragm metering pump.
The minimum flow channels diameter of described recuperation valve 80 and the diameter of piston 30 than greater than, equal 1/6, described recuperation valve 80 is an one-way valve, its liquid entering hole links to each other with oil sump cylinder 20, liquid outlet links to each other with cavity between piston 30 and the piston cavity.
Adopt the immersion type balancing compensation valve, in other words, the liquid entering hole of recuperation valve 80 should be lower than the liquid level of the process fluid in the oil sump cylinder 20, and generally recuperation valve 80 is installed in the bottom of cylinder body 10.
Consider the increasing of compensation hydraulic amount, the minimum flow channels diameter of recuperation valve 80 is not less than 1/6 with the piston diameter ratio, to keep the transient equiliblium of hydraulic pressure cavity hydraulic pressure.The design of the recuperation valve 80 of diaphragm pump
Should consider that the pump suction process produces condition of high vacuum degree, will be complementary with the design of blow-off system simultaneously, so that keep fluid pressure transient equiliblium and solve the not smooth problem of recuperation valve repairing.
Metering diaphragm pump hydraulic end hydraulic pressure processing medium is subjected to high temperature action, the transmission of heat of medium easily produces high-temperature evaporation, the gas that adds the generation of upper piston high temperature reciprocating friction is too much, the described cylinder body 10 of the present invention is provided with deflation over-flow valve 100, its entrance point is communicated with barrier film oil pressure chamber 61, guarantees that the bleed valve venting is smooth.
Described oil pressure adjusting control valve 90 comprises valve body 91, its inner valve ball 92 compresses the valve port place by spring 93, the liquid entering hole 94 of the oil pressure adjusting control valve 90 that links to each other with this valve port links to each other with cavity 111 between piston 30 and the piston cavity, and the liquid outlet 95 of oil pressure adjusting control valve 90 is linked barrier film oil pressure chamber 61.
Adopt open type PTFE to fill carbon piston ring 32 sealings on the described piston 30, the center line angle of piston ring 32 openings and piston 30 is 45 degree, so comparatively simply and reliably realizes sealing.
During piston 30 to-and-fro motion, oil pressure adjusting control valve 90 is realized keying, unidirectional conducting function by valve ball 92, spring 93, be that hydraulic oil in the cavity between piston 30 and the piston cavity can flow to barrier film oil pressure chamber 61 through oil pressure adjusting control valve 90, otherwise oil pressure adjusting control valve 90 is in cut-off state.
Claims (7)
1, a kind of fine vacuum diaphragm pump, comprise cylinder body (10) and oil sump cylinder (20), piston (30) is positioned at cylinder body (10), the piston rod (31) of piston (30) is positioned at oil sump cylinder (20) and by the process fluid submergence, the cylinder body (10) that is positioned at piston (30) one sides is provided with pressure fluid feed liquor valve (40) and liquid valve (50), barrier film (60) and fixed support (70) thereof are set therebetween, it is characterized in that: described piston (30) is for stepped, the piston cavity that cooperates with described piston (30) is arranged in the cylinder body (10), being equipped with piston ring on each diameter section of described piston (30) cooperates with the piston cavity of corresponding section, also be provided with recuperation valve (80) and oil pressure adjusting control valve (90) on the described cylinder body (10), the cavity unilaterally connected of oil sump cylinder (20) between recuperation valve (80) and piston (30) and piston cavity, the cavity between piston (30) and the piston cavity is through oil pressure adjusting control valve (90) and barrier film oil pressure chamber (61) unilaterally connected.
2, fine vacuum diaphragm pump according to claim 1 is characterized in that: described piston (30) is stepped for two-segment type, and its smaller diameter end is positioned at diaphragm cavity (61) one sides.
3, fine vacuum diaphragm pump according to claim 1 and 2 is characterized in that: the diameter of the big small piston of described piston (30) is 1.01---1.05 than D/d.
4, according to the described fine vacuum diaphragm pump of claim 1, it is characterized in that: the minimum flow channels diameter of described recuperation valve (80) and the diameter of piston (30) than greater than, equal 1/6, described recuperation valve (80) is an one-way valve, its liquid entering hole links to each other with oil sump cylinder (20), and liquid outlet links to each other with cavity between piston (30) and the piston cavity.
5, according to the described fine vacuum diaphragm pump of claim 1, it is characterized in that: described cylinder body (10) is provided with deflation over-flow valve (100), and its entrance point is communicated with barrier film oil pressure chamber (61).
6, according to the described fine vacuum diaphragm pump of claim 1, it is characterized in that: described oil pressure adjusting control valve (90) comprises valve body (91), its inner valve ball (92) compresses the valve port place by spring (93), the liquid entering hole (94) of the oil pressure adjusting control valve (90) that links to each other with this valve port links to each other with cavity between piston (30) and the piston cavity, and the liquid outlet (95) of oil pressure adjusting control valve (90) is linked barrier film oil pressure chamber (61).
7, according to the described fine vacuum diaphragm pump of claim 3, it is characterized in that: described piston (30) is gone up and is adopted open type PTFE to fill carbon piston ring (32) sealing, and the center line angle of piston ring (32) opening and piston (30) is 45 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100909616A CN101037992B (en) | 2007-03-29 | 2007-03-29 | Fine vacuum diaphragm pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100909616A CN101037992B (en) | 2007-03-29 | 2007-03-29 | Fine vacuum diaphragm pump |
Publications (2)
| Publication Number | Publication Date |
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| CN101037992A true CN101037992A (en) | 2007-09-19 |
| CN101037992B CN101037992B (en) | 2010-10-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2007100909616A Active CN101037992B (en) | 2007-03-29 | 2007-03-29 | Fine vacuum diaphragm pump |
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| CN (1) | CN101037992B (en) |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102996417A (en) * | 2012-11-26 | 2013-03-27 | 陕西东泰能源科技有限公司 | Self-suction membrane pulse circulating pump |
| CN103140679A (en) * | 2010-05-18 | 2013-06-05 | 萨摩亚工业股份公司 | Double-membrane central-flow pump |
| CN103334908A (en) * | 2013-07-02 | 2013-10-02 | 无锡天惠塑机有限公司 | Pneumatic diaphragm pump |
| CN103352833A (en) * | 2013-08-01 | 2013-10-16 | 山东荣利中石油机械有限公司 | Diaphragm pump hydraulic end capable of adjusting flow rate in operation |
| CN105134564A (en) * | 2014-05-27 | 2015-12-09 | 米尔顿罗伊欧洲公司 | Diaphragm pump with hydraulic control including a dedicated degassing path |
| CN105229303A (en) * | 2013-05-10 | 2016-01-06 | 西蒙斯发展公司 | Be with pneumatic reciprocating fluid pump and the correlation technique of the check valve assembly be improved |
| CN106884780A (en) * | 2015-12-16 | 2017-06-23 | 德帕姆(杭州)泵业科技有限公司 | A kind of plunger membrance formula measuring pump |
| CN107539507A (en) * | 2017-05-17 | 2018-01-05 | 苏州康乐辉医药科技有限公司 | A kind of special filling apparatus of suspension |
| CN107940020A (en) * | 2017-11-09 | 2018-04-20 | 新疆巨盛龙环保设备有限公司 | A kind of pneumatic diaphragm valve and the method using the pneumatic diaphragm valve trandfer fluid |
| CN108443122A (en) * | 2018-04-25 | 2018-08-24 | 盐城派威机械有限公司 | A kind of vertical oil pump with form |
| CN108757429A (en) * | 2018-07-09 | 2018-11-06 | 北京中岩大地科技股份有限公司 | A kind of liquid plunger locellus pump head |
| CN110538734A (en) * | 2019-10-10 | 2019-12-06 | 河南捷威机器人科技有限公司 | feeding device and feeding method of rotary cup type electrostatic spraying system |
| CN110548613A (en) * | 2019-10-10 | 2019-12-10 | 河南捷威机器人科技有限公司 | Feeding device and feeding method of rotary cup type electrostatic spraying system |
| CN112460841A (en) * | 2020-04-27 | 2021-03-09 | 钱锡华 | Cold and hot water integrated preparation device based on compressor principle |
| CN112610456A (en) * | 2020-12-21 | 2021-04-06 | 戴勒普(杭州)流体控制科技有限公司 | Ultrahigh pressure metal diaphragm pump |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5685583A (en) * | 1979-12-14 | 1981-07-11 | Diesel Kiki Co Ltd | Controlling device for variable delivery rotary pump |
| DE3151764C2 (en) * | 1980-12-29 | 1983-12-29 | Lewa Herbert Ott Gmbh + Co, 7250 Leonberg | Diaphragm pump with a pressure-relieved, clamped diaphragm |
| CN2040175U (en) * | 1988-08-27 | 1989-06-28 | 永嘉县热电设备厂 | Electric and hydraulic diaphragm type medium-transfering pump |
| DE4141670C2 (en) * | 1991-12-17 | 1994-09-29 | Ott Kg Lewa | Hydraulically driven diaphragm pump with diaphragm stroke limitation |
| CN2466377Y (en) * | 2001-02-15 | 2001-12-19 | 常州市江南电力设备厂 | Diaphragm metering pump |
-
2007
- 2007-03-29 CN CN2007100909616A patent/CN101037992B/en active Active
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| CN103140679A (en) * | 2010-05-18 | 2013-06-05 | 萨摩亚工业股份公司 | Double-membrane central-flow pump |
| CN103140679B (en) * | 2010-05-18 | 2015-11-25 | 萨摩亚工业股份公司 | Double-membrane central-flow pump |
| CN102996417A (en) * | 2012-11-26 | 2013-03-27 | 陕西东泰能源科技有限公司 | Self-suction membrane pulse circulating pump |
| CN105229303B (en) * | 2013-05-10 | 2018-10-12 | 白骑士液体处理公司 | Pneumatic reciprocating fluid pump and correlation technique with improved check valve assembly |
| CN105229303A (en) * | 2013-05-10 | 2016-01-06 | 西蒙斯发展公司 | Be with pneumatic reciprocating fluid pump and the correlation technique of the check valve assembly be improved |
| US10036382B2 (en) | 2013-05-10 | 2018-07-31 | White Knight Fluid Handling Inc. | Pneumatic reciprocating fluid pump with improved check valve assembly, and related methods |
| US10273953B2 (en) | 2013-05-10 | 2019-04-30 | White Knight Fluid Handling Inc. | Methods of manufacturing a pneumatic reciprocating fluid pump with improved check valve assembly |
| CN103334908A (en) * | 2013-07-02 | 2013-10-02 | 无锡天惠塑机有限公司 | Pneumatic diaphragm pump |
| CN103352833A (en) * | 2013-08-01 | 2013-10-16 | 山东荣利中石油机械有限公司 | Diaphragm pump hydraulic end capable of adjusting flow rate in operation |
| CN103352833B (en) * | 2013-08-01 | 2015-10-28 | 山东荣利中石油机械有限公司 | A kind of membrane pump fluid end of the adjust flux that can be in operation |
| CN105134564A (en) * | 2014-05-27 | 2015-12-09 | 米尔顿罗伊欧洲公司 | Diaphragm pump with hydraulic control including a dedicated degassing path |
| US9856870B2 (en) | 2014-05-27 | 2018-01-02 | Milton Roy Europe | Hydraulically controlled diaphragm pump comprising a dedicated degassing path |
| RU2598499C1 (en) * | 2014-05-27 | 2016-09-27 | Милтон Руа Эроп | Diaphragm pump with hydraulic control containing a specially dedicated line for gas removal |
| CN106884780A (en) * | 2015-12-16 | 2017-06-23 | 德帕姆(杭州)泵业科技有限公司 | A kind of plunger membrance formula measuring pump |
| CN107539507B (en) * | 2017-05-17 | 2019-10-01 | 苏州康乐辉医药科技有限公司 | A kind of dedicated filling apparatus of suspension |
| CN107539507A (en) * | 2017-05-17 | 2018-01-05 | 苏州康乐辉医药科技有限公司 | A kind of special filling apparatus of suspension |
| CN107940020A (en) * | 2017-11-09 | 2018-04-20 | 新疆巨盛龙环保设备有限公司 | A kind of pneumatic diaphragm valve and the method using the pneumatic diaphragm valve trandfer fluid |
| CN108443122A (en) * | 2018-04-25 | 2018-08-24 | 盐城派威机械有限公司 | A kind of vertical oil pump with form |
| CN108757429A (en) * | 2018-07-09 | 2018-11-06 | 北京中岩大地科技股份有限公司 | A kind of liquid plunger locellus pump head |
| CN110538734A (en) * | 2019-10-10 | 2019-12-06 | 河南捷威机器人科技有限公司 | feeding device and feeding method of rotary cup type electrostatic spraying system |
| CN110548613A (en) * | 2019-10-10 | 2019-12-10 | 河南捷威机器人科技有限公司 | Feeding device and feeding method of rotary cup type electrostatic spraying system |
| CN112460841A (en) * | 2020-04-27 | 2021-03-09 | 钱锡华 | Cold and hot water integrated preparation device based on compressor principle |
| CN112460841B (en) * | 2020-04-27 | 2023-06-16 | 深圳市永福轩电器有限公司 | Cold and hot water one-piece preparing device based on compressor principle |
| CN112610456A (en) * | 2020-12-21 | 2021-04-06 | 戴勒普(杭州)流体控制科技有限公司 | Ultrahigh pressure metal diaphragm pump |
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| CN101037992B (en) | 2010-10-06 |
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Owner name: HEFEI HUASHENG PUMPS + VALVES CO., LTD. Free format text: FORMER NAME: HEFEI HUASHENG PUMP + VALVE CO., LTD. |
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Address after: Shuangfeng Economic Development Zone, Hefei city of Anhui Province Jin Huai road 231131 No. 6 Patentee after: HEFEI HUASHENG VALVE LIMITED BY SHARE LTD. Address before: 230088 Anhui city of Hefei province high tech Zone Road No. 19 days Tianyi Business Center No. 301 Patentee before: Hefei Huasheng Pumps Valves Co., Ltd. |