CN105864096B - A kind of single-stage double-suction middle-opening pump with good seal performance - Google Patents
A kind of single-stage double-suction middle-opening pump with good seal performance Download PDFInfo
- Publication number
- CN105864096B CN105864096B CN201610328145.3A CN201610328145A CN105864096B CN 105864096 B CN105864096 B CN 105864096B CN 201610328145 A CN201610328145 A CN 201610328145A CN 105864096 B CN105864096 B CN 105864096B
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- China
- Prior art keywords
- impeller
- pump
- ring
- seal
- filler
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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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/086—Sealings especially adapted for liquid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/586—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/60—Mounting; Assembling; Disassembling
- F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
- F04D29/628—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for liquid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/669—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for liquid pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The present invention relates to middle-opening pump fields, specially a kind of single-stage double-suction middle-opening pump with good seal performance, it includes front bearing block, rear axle bearing and the pump shaft through them, it is arranged with axle sleeve on the pump shaft, the pump housing for being socketed with impeller in the middle part of the pump shaft and coordinating with impeller, and the pump housing is connect by fastener with front bearing block and rear axle bearing, it is provided with seal member between the pump housing and impeller, the both sides of the pump housing are provided with pump cover, and stuffing seal and mechanically-sealing apparatus are combined with respectively at the pump cover of both sides；The object of the present invention is to provide a kind of, and the single-stage double-suction middle-opening with good seal performance pumps, by specific stuffing seal and impeller sealing component, good sealing effect is realized, while bearing span can be reduced, prevent impeller ring from falling off, it is ensured that the normal operation of pump.
Description
Technical field
The present invention relates to middle-opening pump field, specially a kind of single-stage double-suction middle-opening pump with good seal performance.
Background technology
Middle-opening pump is a kind of a kind of Hydraulic Elements that low-pressure medium is changed into high-pressure medium, and therefore, it is necessary to good close
Feng Xing, and the sealing of the pump housing is the important component of middle-opening pump sealing.
Existing middle-opening pump common procurement S, SH type Split pump structure, since middle-opening pump hydraulic model is special, flow is from leaf
Both sides intake impeller simultaneously is taken turns, to which suction chamber is wider, it is larger to result in bearing span, when bearing span is larger, pump operation
When impeller generate radial load can act on axis, formed a prodigious amount of deflection, bearing span is bigger, amount of deflection also get over
Greatly；Axis easy tos produce mechanical fatigue because after deflection deformation；Bearing as axis generate amount of deflection and in one it is improper
Stress, so bearing is easy fever, bearing life shortens, or even generates the serious product quality problems such as off-axis.
Meanwhile in traditional design, the positioning method of impeller ring is the mode of junction of the edges of two sheets of paper screw fastened, junction of the edges of two sheets of paper screw
Hole needs on the gap that impeller and impeller ring coordinate with making a hole, due to impeller and impeller ring material difference,
There is definitely operation difficulty in this drilling；After junction of the edges of two sheets of paper screw fastened, due to impeller ring both sides in pump operation
The effect of pressure difference and centrifugal force is easy to make junction of the edges of two sheets of paper toner screw, deviates from so as to cause impeller ring and damages water pump.
Invention content
The object of the present invention is to provide a kind of, and the single-stage double-suction middle-opening with good seal performance pumps, and passes through specific filler
Sealing device and impeller sealing component realize good sealing effect, while can reduce bearing span, prevent impeller ring
It falls off, it is ensured that the normal operation of pump.
In order to achieve the goal above, the technical solution adopted by the present invention is：A kind of single-stage with good seal performance is double
Middle-opening pump is inhaled, it includes front bearing block（2）, rear axle bearing（11）With the pump shaft through them（10）, the pump shaft
（10）On be arranged with axle sleeve（21）, the pump shaft（10）Middle part be socketed with impeller（43）With with impeller（43）The pump housing of cooperation
（3）, and the pump housing（3）Pass through fastener（1）With front bearing block（2）And rear axle bearing（11）Connection, the pump housing（3）With
Impeller（43）Between be provided with seal member（7）, the pump housing（3）Both sides be provided with pump cover（22）, the pump cover of both sides
（22）Place is combined with stuffing seal respectively（4）And mechanically-sealing apparatus（9）, the stuffing seal（4）Including axis
Set（21）On be socketed with and pump cover（22）The filler interstage sleeve of docking（23）, the filler interstage sleeve（23）It is connected with and coordinates with it
Gland（24）, and gland（24）With filler interstage sleeve（23）Between form seal chamber, be provided in the seal chamber
Packing ring（30）And filler（31）, the packing ring（30）With filler interstage sleeve（23）On the flushing hole that opens up（2301）Docking,
The filler interstage sleeve（23）Outside be provided with and flushing hole（2301）The water flowing case of connection（28）, and water flowing case（28）With punching
Wash pipe（27）Connection；The seal member（7）Including impeller（43）The impeller ring that outside is arranged（42）, the impeller
Sealing ring（42）And impeller（43）Pass through the lock-screw being radially arranged（44）Locking；The impeller ring（42）Outside
It is provided with casing ring（41）, the casing ring（41）It is arranged in the pump housing（3）On.
Further, the stuffing seal（4）And mechanically-sealing apparatus（9）Pass through seal gusset（12）With pump
Lid（22）And impeller cooperation, and seal gusset（12）With pump cover（22）Gap be 1.5-3mm, with impeller inlet side cooperation
Side and pump cover（22）Seam allowance side is concordant.
Further, the gland（24）With filler interstage sleeve（23）Pass through locking screw（25）And locking nut
（26）Connection, and filler interstage sleeve（23）On offer with much with 3 and locking screw（25）The threaded hole of cooperation.
Further, the filler interstage sleeve（23）On uniformly offer no less than 3 flushing holes（2301）.
Further, the filler（31）For graphite circle, and packing ring（30）Outside be provided with 3 graphite circles, it is interior
Side is provided with a graphite circle.
Further, the gland（24）Penetrate filler interstage sleeve（23）Internal end face is inclined-plane；Described fills out
Expect interstage sleeve（23）Close to the pump housing（3）Medial surface be inclined-plane.
Further, the filler interstage sleeve（23）With the pump housing（3）It is provided with gasket between the position of contact（29）；Institute
The filler interstage sleeve stated（23）For stainless steel material.
Further, the impeller ring（42）With impeller（43）For interference fit, the impeller ring
（42）And casing ring（41）For clearance fit.
Further, the casing ring（41）On in axial direction offer detection hole（4101）.
Further, the lock-screw（44）Including main body（4401）, main body（4401）With impeller ring（42）
It is provided with one layer of rubber layer on the outside of the position of cooperation（4402）.
Further, the lock-screw（44）Flange position on the inside of be provided with limiting slot（4403）, the limit
Position slot（4403）With impeller（43）The spacing ring of upper setting（4301）Cooperation.
Further, the lock-screw（44）Flange on the outside of be provided with and tighten block（4404）.
Beneficial effects of the present invention are：
1, the filler interstage sleeve of one tubular is set, and a water flowing case communicated therewith is set on the outside of filler interstage sleeve, is led to
It crosses water flowing case to connect with washing pipe, makes the position of seal chamber closer to impeller, bearing span is made to reduce, ensure that scratching for axis
Degree is in a safely range.
2, impeller and impeller ring are locked by the clamping screw being radially arranged, pine will not occurs because of wheel rotation
It is dynamic, impeller ring can be effectively prevented and fallen off, ensure that water pump is safely and smoothly run, and assembled simple；It simultaneously can be with
It is not limited by the impeller of special substance.
3, make seal on the basis of the original increasing is widened at the gusset on seal, the gap with pump cover is in 1.5-
3mm, it is concordant when the side of cooperation is with pump cover seam allowance with impeller inlet, improve the anti-cavitation performance of single-stage double-suction middle-opening pump.
4, gland and filler interstage sleeve are fixed using locking screw and locking nut, it is easy to disassemble, and number
No less than three groups of amount, therefore can greatly improve the efficiency of locking.
5, filler uses graphite circle, the distribution pattern of packing ring outside three to ensure that flushing water can return to water pump in time
Suction chamber, reduce leakage rate.
6, the design of gasket further improves the effect of sealing.
7, impeller ring and impeller can improve sealing effect, impeller ring and pump housing sealing using interference fit
Ring is gap-matched, and can reduce abrasion.
8, the design of detection hole can observe the gap between casing ring and impeller ring, and then realize more preferable
Cooperation installation effect.
9, the design of rubber layer can be such that impeller ring and clamping screw coordinates even closer, further prevent impeller
Sealing ring falls off.
10, the cooperation of spacing ring and limiting slot further enhances the locking effect of lock-screw, prevents screw from moving,
And the installation of screw is not interfered with.
11, the design for turning block greatly facilitates tightening for lock-screw, improves efficiency of assembling.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram of the single-stage double-suction middle-opening pump with good seal performance.
Fig. 2 is the partial enlarged view of A in Fig. 1.
Fig. 3 is the structural schematic diagram of filler block.
Fig. 4 is the structural schematic diagram of seal member.
Fig. 5 is the partial enlarged view of B in Fig. 4.
Fig. 6 is the structural schematic diagram of clamping screw.
Label character as shown in the figure is expressed as：1, fastener；2, front bearing block；3, the pump housing；4, stuffing seal；7,
Seal member；8, silk plug block；9, mechanically-sealing apparatus；10, pump shaft；11, rear axle bearing；12, seal gusset；21, axle sleeve；
22, pump cover；23, filler interstage sleeve；24, gland；25, locking screw；26, locking nut；27, flush pipe；28, water flowing case；
29, gasket；30, packing ring；31, filler；2301, flushing hole；2302, threaded hole；41, casing ring；42, impeller seals
Ring；43, impeller；44, lock-screw；4101, detection hole；4301, spacing ring；4401, bolt body；4402, rubber layer；
4403, limiting slot；4404, block is tightened.
Specific implementation mode
In order to make those skilled in the art more fully understand technical scheme of the present invention, below in conjunction with the accompanying drawings to the present invention into
The description of row detailed description, this part is only exemplary and explanatory, should not there is any limitation to protection scope of the present invention
Effect.
As shown in figs 1 to 6, structure of the invention is：A kind of single-stage double-suction middle-opening pump with good seal performance,
It includes front bearing block 2, rear axle bearing 11 and the pump shaft 10 through them, and axle sleeve 21 is arranged on the pump shaft 10,
The pump housing 3 that the middle part of the pump shaft 10 is socketed with impeller 43 and coordinates with impeller 43, and the pump housing 3 passes through fastener 1 and front
Bearing block 2 and rear axle bearing 11 connect, and seal member 7, the pump housing 3 are provided between the pump housing 3 and impeller 43
Both sides be provided with pump cover 22, stuffing seal 4 and mechanically-sealing apparatus 9 are combined at the pump cover 22 of both sides respectively, it is described
Stuffing seal 4 include being socketed with the filler interstage sleeve 23 dock with pump cover 22 on axle sleeve 21, the filler interstage sleeve 23 company
It is connected to the gland 24 coordinated with it, and forms seal chamber between gland 24 and filler interstage sleeve 23, the seal chamber
It is inside provided with packing ring 30 and filler 31, the flushing hole 2301 opened up on the packing ring 30 and filler interstage sleeve 23 is docked, institute
The outside for the filler interstage sleeve 23 stated is provided with the water flowing case 28 being connected to flushing hole 2301, and water flowing case 28 connects with flush pipe 27
It is logical；The seal member 7 includes the impeller ring 42 that 43 outside of impeller is arranged, the impeller ring 42 and impeller 43
It is locked by the lock-screw 44 being radially arranged；The outside of the impeller ring 42 is provided with casing ring 41, described
Casing ring 41 be arranged on the pump housing 3.
Preferably, the stuffing seal 4 and mechanically-sealing apparatus 9 pass through seal gusset 12 and pump cover 22 and leaf
Wheel cooperation, and the gap of seal gusset 12 and pump cover 22 is 1.5-3mm, stops with the side of impeller inlet side cooperation and pump cover 22
Mouth side is concordant.
Preferably, the gland 24 and filler interstage sleeve 23 are connected by locking screw 25 and locking nut 26, and
The threaded hole for offering on filler interstage sleeve 23 and much coordinating with locking screw 5 with 3.
Preferably, no less than 3 flushing holes 2301 are uniformly offered on the filler interstage sleeve 23.
Preferably, the filler 31 is graphite circle, and the outside of packing ring 30 is provided with 3 graphite circles, inside setting
There is a graphite circle.
Preferably, it is inclined-plane that the gland 24, which penetrates the end face inside filler interstage sleeve 23,；The filler interstage sleeve
23 close to the pump housing 3 medial surface be inclined-plane.
Preferably, gasket 9 is provided between the position that the filler interstage sleeve 23 is contacted with the pump housing 3；The filler
Interstage sleeve 23 is stainless steel material.
Further, the impeller ring 42 and impeller 43 are interference fit, the impeller ring 42 and pump
Body sealing ring 41 is clearance fit.
Preferably, detection hole 4101 is in axial direction offered on the casing ring 41.
Preferably, the lock-screw 44 includes main body 4401, the position that main body 4401 coordinates with impeller ring 42
Outside is provided with one layer of rubber layer 4402.
Preferably, limiting slot 4403, the limiting slot are provided on the inside of the flange position of the lock-screw 44
4403 coordinate with the spacing ring 4301 being arranged on impeller 43.
Preferably, it is provided on the outside of the flange of the lock-screw 44 and tightens block 4404.
When specifically used, casing ring 41 has first been opened up into detection hole 4101, casing ring 41 is then loaded onto into pump
Impeller ring 42 is sleeved on impeller 43 by body 3 later, and makes the cooperation of corresponding hole position, later loads onto lock-screw 44, and
So that rubber layer 4402 is fitted close with impeller ring 42, limiting slot 4403 and spacing ring 4301 is made to be fitted close, it then will dress
Impeller 43 and the pump housing 3 after good are assembled, and assembling entire single-stage double-suction middle-opening according to Fig. 1 pumps, in the operation process of pump,
By washing 7 water filling of pipe, then pass through water flowing case 8, entered in packing ring 10 from flushing hole 301, carries out cooling water washing, it is ensured that
The normal operation of packing ring 10, while can effectively reduce bearing span ensure that the amount of deflection of axis in a safely range；
And water flowing case 8 can also play good cooling effect, further prevent the excessively high damage filling-material structure of temperature；It can lead to simultaneously
Good anti-cavitation can be played by crossing the seal gusset 12 of specific setting.
It should be noted that herein, the terms "include", "comprise" or its any other variant are intended to non-row
His property includes, so that the process, method, article or equipment including a series of elements includes not only those elements, and
And further include other elements that are not explicitly listed, or further include for this process, method, article or equipment institute it is intrinsic
Element.
Principle and implementation of the present invention are described for specific case used herein, the explanation of above example
It is merely used to help understand the method and its core concept of the present invention.The above is only a preferred embodiment of the present invention, it answers
When pointing out due to the finiteness of literal expression, and objectively there is unlimited concrete structure, for the common skill of the art
For art personnel, without departing from the principle of the present invention, several improvement, retouching or variation can also be made, can also incited somebody to action
Above-mentioned technical characteristic is combined in the right way；These improve retouching, variation or combination, or the not improved structure by invention
Think and technical solution directly applies to other occasions, is regarded as protection scope of the present invention.
Claims (7)
1. a kind of single-stage double-suction middle-opening pump with good seal performance, which is characterized in that it includes front bearing block（2）, after
Portion's bearing block（11）With the pump shaft through them（10）, the pump shaft（10）On be arranged with axle sleeve（21）, the pump shaft
（10）Middle part be socketed with impeller（43）With with impeller（43）The pump housing of cooperation（3）, and the pump housing（3）Pass through fastener（1）With it is preceding
Portion's bearing block（2）And rear axle bearing（11）Connection, the pump housing（3）And impeller（43）Between be provided with seal member（7）,
The pump housing（3）Both sides be provided with pump cover（22）, the pump cover of both sides（22）Place is combined with stuffing seal respectively（4）With
Mechanically-sealing apparatus（9）, the stuffing seal（4）Including axle sleeve（21）On be socketed with and pump cover（22）The filler of docking
Interstage sleeve（23）, the filler interstage sleeve（23）It is connected with the gland coordinated with it（24）, and gland（24）And filler
Interstage sleeve（23）Between form seal chamber, be provided with packing ring in the seal chamber（30）And filler（31）, the packing ring
（30）With filler interstage sleeve（23）On the flushing hole that opens up（2301）Docking, the filler interstage sleeve（23）Outside be provided with and rush
Hole flushing（2301）The water flowing case of connection（28）, and water flowing case（28）With flush pipe（27）Connection；The seal member（7）Including
Impeller（43）The impeller ring that outside is arranged（42）, the impeller ring（42）And impeller（43）Pass through what is be radially arranged
Lock-screw（44）Locking；The impeller ring（42）Outside be provided with casing ring（41）, the pump housing is close
Seal ring（41）It is arranged in the pump housing（3）On；The stuffing seal（4）And mechanically-sealing apparatus（9）Pass through seal gusset
（12）With pump cover（22）And impeller cooperation, and seal gusset（12）With pump cover（22）Gap be 1.5-3mm and impeller inlet
The side of side cooperation and pump cover（22）Seam allowance side is concordant；The lock-screw（44）Including main body（4401）, main body（4401）
With impeller ring（42）It is provided with one layer of rubber layer on the outside of the position of cooperation（4402）；The lock-screw（44）Flange
It is provided with limiting slot on the inside of position（4403）, the limiting slot（4403）With impeller（43）The spacing ring of upper setting（4301）Match
It closes.
2. a kind of single-stage double-suction middle-opening pump with good seal performance according to claim 1, which is characterized in that institute
The filler stated（31）For graphite circle, and packing ring（30）Outside be provided with 3 graphite circles, inside is provided with a graphite circle.
3. a kind of single-stage double-suction middle-opening pump with good seal performance according to claim 2, which is characterized in that described
Gland（24）Penetrate filler interstage sleeve（23）Internal end face is inclined-plane；The filler interstage sleeve（23）Close to the pump housing（3）
Medial surface be inclined-plane.
4. a kind of single-stage double-suction middle-opening pump with good seal performance according to claim 1, which is characterized in that described
Filler interstage sleeve（23）With seal gusset（12）It is provided with gasket between the position of contact（29）；The filler interstage sleeve
（23）For stainless steel material.
5. a kind of single-stage double-suction middle-opening pump with good seal performance according to claim 1, which is characterized in that described
Impeller ring（42）With impeller（43）For interference fit, the impeller ring（42）And casing ring（41）For
Gap coordinates.
6. a kind of single-stage double-suction middle-opening pump with good seal performance according to claim 5, which is characterized in that described
Casing ring（41）On in axial direction offer detection hole（4101）.
7. a kind of single-stage double-suction middle-opening pump with good seal performance according to claim 1, which is characterized in that described
Lock-screw（44）Flange on the outside of be provided with and tighten block（4404）.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610328145.3A CN105864096B (en) | 2016-05-18 | 2016-05-18 | A kind of single-stage double-suction middle-opening pump with good seal performance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610328145.3A CN105864096B (en) | 2016-05-18 | 2016-05-18 | A kind of single-stage double-suction middle-opening pump with good seal performance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105864096A CN105864096A (en) | 2016-08-17 |
| CN105864096B true CN105864096B (en) | 2018-10-30 |
Family
ID=56635296
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610328145.3A Active CN105864096B (en) | 2016-05-18 | 2016-05-18 | A kind of single-stage double-suction middle-opening pump with good seal performance |
Country Status (1)
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| CN (1) | CN105864096B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107313942A (en) * | 2017-06-08 | 2017-11-03 | 三联泵业股份有限公司 | The single-stage double-suction middle-opening pump that a kind of anti-seal ring comes off |
| CN110094334A (en) * | 2018-01-28 | 2019-08-06 | 吴军 | A kind of submerged pump pump body mounting structure |
| CN108443169A (en) * | 2018-05-29 | 2018-08-24 | 宜兴市宙斯泵业有限公司 | A kind of centrifugation shurry pump with air shaft sealing device |
| CN109505804A (en) * | 2018-12-25 | 2019-03-22 | 三联泵业股份有限公司 | Cooling water carries out the pipeline of cooling protection to mechanical seal and casing ring |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4661044A (en) * | 1985-05-24 | 1987-04-28 | Goulds Pumps, Incorporated | Pump having a bushing removal mechanism |
| ZA200507096B (en) * | 2004-09-07 | 2006-06-28 | Crane John Inc | Sealing system for slurry pump |
| CN201687762U (en) * | 2009-11-03 | 2010-12-29 | 浙江飞旋泵业有限公司 | Sealing structure of centrifugal pump |
| CN102606524A (en) * | 2012-03-27 | 2012-07-25 | 上海阿波罗机械股份有限公司 | Oil conveying main pump |
| CN203230842U (en) * | 2013-03-15 | 2013-10-09 | 北京航天动力研究所 | Novel stuffing box easy to disassemble and assemble |
| CN203532314U (en) * | 2013-11-20 | 2014-04-09 | 浙江佳力科技股份有限公司 | Labyrinth impeller ring clearance structure |
| CN203822692U (en) * | 2014-05-15 | 2014-09-10 | 罗静 | Axial packing seal device |
| CN205639051U (en) * | 2016-05-18 | 2016-10-12 | 湖南南方长河泵业有限公司 | Turn on pump in single -stage double suction with good sealing performance |
-
2016
- 2016-05-18 CN CN201610328145.3A patent/CN105864096B/en active Active
Also Published As
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| CN105864096A (en) | 2016-08-17 |
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Effective date of registration: 20230817 Address after: No. 31 Huancheng South Road, Zhongguan Town, Deqing County, Huzhou City, Zhejiang Province, 313000 Patentee after: Zhejiang Nanfang Pump Industry Co.,Ltd. Address before: 410100 Hunan Nanfang Changhe Pump Industry Co.,Ltd., No. 45 Xichong Road, Quantang Street, Changsha Economic and Technological Development Zone, Changsha City, Hunan Province Patentee before: HUNAN NANFANG CHANGHE PUMP INDUSTRY CO.,LTD. |