CN105822518A - Plunger type oil diaphragm pump - Google Patents
Plunger type oil diaphragm pump Download PDFInfo
- Publication number
- CN105822518A CN105822518A CN201610327253.9A CN201610327253A CN105822518A CN 105822518 A CN105822518 A CN 105822518A CN 201610327253 A CN201610327253 A CN 201610327253A CN 105822518 A CN105822518 A CN 105822518A
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- Prior art keywords
- plunger
- assembly
- pump
- stuffing box
- main
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Classifications
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- 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
- F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
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- 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
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/02—Packing the free space between cylinders and pistons
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- 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
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/04—Draining
-
- 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
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/10—Valves; Arrangement of valves
- F04B53/1002—Ball valves
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Details Of Reciprocating Pumps (AREA)
Abstract
The invention relates to a plunger type oil diaphragm pump which comprises a hydraulic end and a power end. The hydraulic end comprises a pump body assembly, a plunger (2) arranged in the pump body assembly, and a hydraulic cylinder support (14) used for fixing the pump body assembly. The hydraulic cylinder support (14) and a machine body at the power end are assembled together to be used for fixing the hydraulic end. The pump body assembly comprises a pump body (1), and a plunger channel is arranged in the pump body (1). The plunger is movably arranged in the plunger channel, and a sealing box assembly is arranged between the plunger and the plunger channel. The plunger type oil diaphragm pump is characterized in that a main sealing cavity is formed in the front end of the plunger channel, and an auxiliary sealing cavity is formed in the rear end of the plunger channel; the sealing box assembly comprises a main stuffing box assembly arranged in the main sealing cavity and an auxiliary stuffing box assembly arranged in the auxiliary sealing cavity; an oil bath used for separating the main stuffing box assembly from the auxiliary stuffing box assembly is arranged in the portion, between a stuffing box and an auxiliary stuffing box, of the plunger channel; and the oil bath is filled with lubricating oil (21). According to the plunger type oil diaphragm pump, medium leakage is avoided, and the plunger is convenient to machine, assemble and disassemble.
Description
Technical field
The invention belongs to technical field of mechanical automation, be specifically related to one and can carry the plunger type oil membrane pump of hazardous medium (such as methanol).
Background technology
Traditional plunger type metering pump medium-tight position is made up of plunger, filler, fairlead, packing press ring, adjusting nut, as shown in Figure 1, the seal form such as V-arrangement, U-shaped, rectangle are had to form one group of band, along with filler abrasion, pressure increase, medium can directly leak in fluid cylinder from filler with plunger, it is water or nontoxic liquid to pumped (conveying) medium, this leakage is to allow, as long as leakage rate is less than national Specification, the leakage of trace even can improve the service life of plunger and filler.But to conveying this hazardous medium of methanol, at the seal clearance of plunger and filler, produced leakage, definitely can not be exposed in air.So typically carrying the such medium of methanol, accompanying drawing 2 diaphragm metering pump can be used.Diaphragm metering pump makes medium methanol and airtight and watertight padding separate by barrier film, reach zero leakage, but it is higher typically to manufacture diaphragm metering pump processing cost, processing technique and required precision are the highest, and especially three valves adjust cumbersome, professional the strongest, general user is difficult to operation, and the diaphragm life-span is the longest, changes diaphragm dismounting inconvenience, during it, also can reveal a large amount of medium methanol.So, it is provided that a kind of without revealing, the plunger type oil diaphragm metering pump of processing easy accessibility is just particularly important.
Summary of the invention
The technical problem to be solved is to provide a kind of No leakage, the plunger type oil membrane pump of processing easy accessibility for above-mentioned prior art.
nullThe present invention solves the technical scheme that above-mentioned technical problem used: a kind of plunger type oil membrane pump，Including fluid end and power end，Fluid end comprises pump assembly，The plunger being arranged in pump assembly，For fixing the fluid cylinder support of pump assembly，Wherein fluid cylinder support and power end fuselage are assembled together for fixing whole fluid end，Wherein said pump assembly comprises the pump housing，Plunger channel and the valve group passage connected with plunger it is provided with in the pump housing，Plunger is movably arranged in plunger channel，Sealed letter body assembly it is provided with between plunger and plunger channel，It is characterized in that: the front end of described plunger channel is provided with main seal cavity，The rear end of described plunger channel is provided with auxiliary seal cavity，Described sealed letter body assembly comprises the main stuffing box body assembly being arranged in main seal cavity，With the secondary stuffing box body assembly being arranged in auxiliary seal cavity，It is provided with in plunger channel between described main stuffing box body and secondary stuffing box body for cutting off main stuffing box body and the oil sump of secondary stuffing box body，It is provided with lubricating oil in this oil sump.
As improvement, the described pump housing being provided with the backflow valve pocket connected with oil sump, this reflux inlet intracavity is provided with reflux inlet assembly, and the entrance of reflux inlet assembly connects with oil sump, the outlet of reflux inlet assembly and valve group channel connection.
Improve again, described reflux inlet assembly comprises valve ball, valve bonnet, valve spring, plug screw support and plug screw, during wherein valve ball is initially charged with the backflow valve pocket of the pump housing, valve bonnet in rear enclosure, place into valve spring, finally screwing in plug screw support and withstand valve spring, the fabrication hole plug screw outside valve pocket that the last pump housing refluxes blocks.
Preferably, the pressure of opening of described reflux inlet assembly is 0.8～1.2MPa.
Improving, on the described pump housing or the pump housing is outside equipped with the venting valve chamber connected with oil sump, vent valve intracavity is provided with assembly of manually exitting again, and this assembly of manually exitting comprises venting valve ball and the air relief cock offseted with venting valve ball.
Improving, described main stuffing box body assembly includes main pressure ring, primary seal filler and main fairlead, after main pressure ring, primary seal filler and main fairlead are sequentially loaded into the main seal cavity of pump housing front end, is fixed in main seal cavity with gland again.
Improving, described gland outer ring is provided with seal groove, is provided with the sealing ring for realizing the sealing between gland and the pump housing and back-up ring in seal groove again.
Improving, described plunger imports from pump housing front end again, penetrates with secondary stuffing box body inter-module from main stuffing box body assembly, loads in the hole, location of crosshead, then with positioning the oblique locking of spiral pin, crosshead is fixed on the rear end of fluid cylinder support；Pump housing drive end bearing bracket upper flange, is locked with hex nut and studs, and the middle part of flange screws in regulation bolt and withstands gland.
Improve again, described valve group passage is provided with medium suction inlet and medium outlet.
Improving, described secondary stuffing box body assembly includes secondary fairlead, secondary airtight and watertight padding and secondary pressure ring, after fairlead, secondary airtight and watertight padding and secondary pressure ring are sequentially loaded into the auxiliary seal cavity of pump housing rear end, threaded with adjusting nut and pump housing rear end again
Compared with prior art, it is an advantage of the current invention that: by arranging two grades of main stuffing box bodies and forming an oil sump (oil diaphragm cavity) and medium is sealed and leakage-preventing creates a good condition, it is achieved that major and minor two grades of stuffing box body assemblies leakage medium (methanol) are sealed up for safekeeping；In further scheme, the automatic back flow when medium seals pressure up for safekeeping more than reflux inlet assembly inlet pressure, run in oil lubrication owing to plunger and major and minor two grades of filler assemblies all steep, air-proof condition is superior, friction power loss is minimum, life-span is long, reaches the purpose that the medium (methanol) zero in secondary packing seal assembly is revealed.
Accompanying drawing explanation
Fig. 1 is traditional plunger type metering pump structural representation；
Fig. 2 is conventional membrane formula dosing pump structural representation；
Fig. 3 is plunger type oil diaphragm pump structure schematic diagram in the embodiment of the present invention one；
Fig. 4 is plunger type oil diaphragm pump structure schematic diagram in the embodiment of the present invention two.
Detailed description of the invention
Below in conjunction with accompanying drawing embodiment, the present invention is described in further detail.
Embodiment one
Plunger type oil membrane pump as shown in Figure 3, including fluid end and power end, wherein fluid end comprises: include fluid cylinder support 14；Crosshead 13, location spiral pin 17, plunger 2；Adjusting nut 12, secondary pressure ring 11, secondary filler 10, secondary fairlead 9；Machine oil 21, medium (methanol) 22；Manual air-release valves assembly 15: air relief cock 151, valve ball 152, valve chamber 153, sealing gasket 154；The pump housing 1, straight pin 18, locking nut 16；Reflux inlet assembly 19: valve ball 191, valve bonnet 192, valve spring 193, plug screw support 194, plug screw 20；Main pressure ring 4, main filler 5, main fairlead 3, gland 6, O 601, back-up ring 602, regulation bolt 8, flange 7, hex nut 701, studs 702.
Described fluid cylinder support 14 assembles with power end fuselage, is used for fixing whole fluid end.
Being provided with plunger channel and the valve group passage connected with plunger in the pump housing 1, plunger is movably arranged in plunger channel, is provided with sealed letter body assembly between plunger and plunger channel；The pump housing 1 becomes pump assembly with sealed letter body assembly is combined integrated, pump assembly is put in the middle of fluid cylinder support 14, pass fluid cylinder support 14 prelocalization hole again, between position with straight pin 18, then detain at screw thread outside fluid cylinder support 14 prelocalization outer end of hole locking nut 16 and the pump housing 1 front end and screw.
The front end of described plunger channel is provided with main seal cavity, the rear end of described plunger channel is provided with auxiliary seal cavity, described sealed letter body assembly comprises the main stuffing box body assembly being arranged in main seal cavity, with the secondary stuffing box body assembly being arranged in auxiliary seal cavity, it is provided with in plunger channel between described main stuffing box body and secondary stuffing box body for cutting off main stuffing box body and the oil sump of secondary stuffing box body, in this oil sump, is provided with lubricating oil 21.
After described secondary stuffing box body assembly includes that secondary fairlead 9, secondary filler 10, secondary pressure ring 11 are sequentially loaded into pump housing rear end auxiliary seal cavity, screw, to regulate filler at screw thread with detaining outside adjusting nut 12 and the pump housing 1 rear end.
After described main stuffing box body assembly includes that main pressure ring 4, main filler 5, main fairlead 3 are sequentially loaded into the pump housing 1 front end main seal cavity, plunger 2 imports from the pump housing 1 front end, penetrate between main packing seal and secondary packing seal, load in the hole, location of crosshead 13, then with positioning the oblique locking of spiral pin 17；During to tear plunger 2 open, the most only need to screw out location spiral pin 17, pull out plunger 2 from the pump housing 1 front end, remove plunger type metering pump from and diaphragm metering pump is torn plunger open and must be torn the pump housing open, be allowed to dismount more convenient；The pump housing 1 front end reinstalls gland 6 afterwards, and wherein O 601 and back-up ring 602 are loaded in the seal groove of gland 6 outer ring, to reach the purpose sealed with the pump housing 1；The last pump housing 1 drive end bearing bracket upper flange 7, with hex nut, 701 and studs 702 be locked, screw in regulation bolt 8 in the middle of it and withstand gland 6, to reach to regulate the purpose of primary seal filler.
The described pump housing is outside equipped with the venting valve chamber 153 connected with oil sump, seal with sealing gasket 154 between venting valve chamber 153 and the pump housing, vent valve intracavity is provided with manually venting assembly 15, and Manual air-release valves assembly 15 includes venting valve ball 152 and the air relief cock 151 offseted with venting valve ball 152.When oil sump has certain gas, then unscrew air relief cock 151, release unnecessary gas；Before opening pump, screw out whole Manual air-release valves assembly 15, pour appropriate machine oil 21 to submergence plunger 2 into, be used for lubricating plunger 2 and main stuffing box body assembly and secondary stuffing box body assembly.
It is provided with medium suction inlet and medium outlet on described valve group passage；The backflow valve pocket connected with oil sump it is provided with on the upside of the described pump housing 1, this reflux inlet intracavity is provided with reflux inlet assembly 19, the entrance of reflux inlet assembly connects with oil sump, the outlet of reflux inlet assembly connects with the medium suction inlet of valve group passage, described reflux inlet assembly 19 includes valve ball 191, valve bonnet 192, valve spring 193, valve ball 191, valve bonnet 192, valve spring 193 are sequentially loaded into the pump housing 1 and reflux in valve pocket, and with plug screw support 194 screwing hermetic, the last pump housing 1 front-end process hole plug screw 20 blocks sealing；The pressure of opening of reflux inlet assembly 19 is 1MPa；When the plunger 2 of plunger type oil membrane pump moves back and forth, medium (methanol) 22 sucks from suction inlet, discharge from outlet again, when pressure increases therebetween, have in the oil sump that a certain amount of medium (methanol) 22 leaks to the pump housing 1 at main stuffing box body assembly, owing to medium (methanol) 22 density are less than machine oil 21, therefore medium (methanol) 22 can float on machine oil 21, the medium (methanol) of leakage is slowly filled with whole oil sump residual cavity, when cavity pressure is more than 1MPa, reflux inlet assembly 19 above can be opened, then float on medium (methanol) 22 on machine oil 21 and flow into suction inlet by reflux inlet assembly 19, it is discharged into a certain amount of, when cavity pressure is less than 1MPa, then reflux inlet assembly 19 is automatically switched off；Owing to the pressure of intracavity is consistently less than 1MPa, therefore the amount of leakage of secondary stuffing box body assembly is minimum, and reveal herein for machine oil 21, this leakage is to allow, as long as leakage rate is less than national Specification, the leakage of trace even can improve the service life of plunger and filler.
Embodiment two
Unlike embodiment one, due to the difference of medium, backflow valve pocket position is arranged on the downside of the pump housing 1, and corresponding suction inlet is lower section, and outlet is top, shown in Figure 4.Specifically, the pumped (conveying) medium density of this embodiment is bigger than machine oil 21, therefore medium can be sunken to below machine oil 21, the medium of leakage is slowly filled with whole oil sump residual cavity, and when cavity pressure is more than 1MPa, the reflux inlet assembly 19 being positioned at lower section can be opened, then it is sunken to machine oil 21 lower dielectric and flows into suction inlet by reflux inlet assembly 19, being discharged into a certain amount of, when cavity pressure is less than 1MPa, then reflux inlet assembly 19 is automatically switched off.Owing to the pressure of intracavity is consistently less than 1MPa, therefore the amount of leakage of secondary stuffing box body assembly is minimum, and reveal herein for machine oil 21, this leakage is to allow, as long as leakage rate is less than national Specification, the leakage of trace even can improve the service life of plunger and filler.
Claims (10)
- null1. a plunger type oil membrane pump，Including fluid end and power end，Fluid end comprises pump assembly，The plunger (2) being arranged in pump assembly，For fixing the fluid cylinder support (14) of pump assembly，Wherein fluid cylinder support (14) and power end fuselage are assembled together for fixing whole fluid end，Wherein said pump assembly comprises the pump housing (1)，Plunger channel and the valve group passage connected with plunger it is provided with in the pump housing (1)，Plunger is movably arranged in plunger channel，Sealed letter body assembly it is provided with between plunger and plunger channel，It is characterized in that: the front end of described plunger channel is provided with main seal cavity，The rear end of described plunger channel is provided with auxiliary seal cavity，Described sealed letter body assembly comprises the main stuffing box body assembly being arranged in main seal cavity，With the secondary stuffing box body assembly being arranged in auxiliary seal cavity，It is provided with in plunger channel between described main stuffing box body and secondary stuffing box body for cutting off main stuffing box body and the oil sump of secondary stuffing box body，Lubricating oil (21) it is provided with in this oil sump.
- Plunger type oil membrane pump the most according to claim 1, it is characterized in that: on the described pump housing (1), be provided with the backflow valve pocket connected with oil sump, this reflux inlet intracavity is provided with reflux inlet assembly (19), the entrance of reflux inlet assembly connects with oil sump, the outlet of reflux inlet assembly and valve group channel connection.
- Plunger type oil membrane pump the most according to claim 2, it is characterized in that: described reflux inlet assembly (19) comprises valve ball (191), valve bonnet (192), valve spring (193), plug screw support (194) and plug screw (20), wherein valve ball (191) is initially charged with in the backflow valve pocket of the pump housing, valve bonnet (192) in rear enclosure, place into valve spring (193), finally screwing in plug screw support (194) and withstand valve spring (193), the fabrication hole plug screw (20) outside valve pocket that the last pump housing refluxes blocks.
- Plunger type oil membrane pump the most according to claim 3, it is characterised in that: the pressure of opening of described reflux inlet assembly (19) is 0.8～1.2MPa.
- 5. according to the plunger type oil membrane pump described in any one claim in Claims 1 to 4, it is characterized in that: on the described pump housing or the pump housing is outside equipped with the venting valve chamber (153) connected with oil sump, vent valve intracavity is provided with assembly of manually exitting (15), and this assembly of manually exitting comprises venting valve ball (151) and the air relief cock (151) offseted with venting valve ball.
- Plunger type oil membrane pump the most according to claim 1, it is characterized in that: described main stuffing box body assembly includes main pressure ring (4), primary seal filler (5) and main fairlead (3), after main pressure ring (4), primary seal filler (5) and main fairlead (3) are sequentially loaded into the main seal cavity of the pump housing (1) front end, it is fixed in main seal cavity with gland (6).
- Plunger type oil membrane pump the most according to claim 6, it is characterized in that: described gland (6) outer ring is provided with seal groove, in seal groove, be provided with the sealing ring (601) for realizing the sealing between gland and the pump housing and back-up ring (602).
- 8. according to the plunger type oil membrane pump described in claim 6 or 7, it is characterized in that: described plunger imports from pump (1) front end, penetrate with secondary stuffing box body inter-module from main stuffing box body assembly, load in the hole, location of crosshead (13), again with location spiral pin (17) oblique locking, crosshead (13) is fixed on the rear end of fluid cylinder support；The pump housing (1) drive end bearing bracket upper flange (7), is locked with hex nut (701) and studs (702), and the middle part of flange (7) screws in regulation bolt (8) and withstands gland 6.
- Plunger type oil membrane pump the most according to claim 1, it is characterised in that: it is provided with medium suction inlet and medium outlet on described valve group passage.
- Plunger type oil membrane pump the most according to claim 1, it is characterized in that: described secondary stuffing box body assembly includes secondary fairlead (9), secondary airtight and watertight padding (10) and secondary pressure ring (11), after fairlead (9), secondary airtight and watertight padding (10) and secondary pressure ring (11) are sequentially loaded into the auxiliary seal cavity of pump housing rear end, threaded with adjusting nut (12) and the pump housing (1) rear end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610327253.9A CN105822518B (en) | 2016-05-17 | 2016-05-17 | A kind of plunger type oil membrane pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610327253.9A CN105822518B (en) | 2016-05-17 | 2016-05-17 | A kind of plunger type oil membrane pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105822518A true CN105822518A (en) | 2016-08-03 |
| CN105822518B CN105822518B (en) | 2018-01-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610327253.9A Active CN105822518B (en) | 2016-05-17 | 2016-05-17 | A kind of plunger type oil membrane pump |
Country Status (1)
| Country | Link |
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| CN (1) | CN105822518B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109073155A (en) * | 2016-01-29 | 2018-12-21 | 克里奥斯塔股份有限公司 | For distributing the external member of liquefied gas |
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| US6623259B1 (en) * | 2002-05-06 | 2003-09-23 | George H. Blume | High pressure plunger pump housing and packing |
| JP2006070717A (en) * | 2004-08-31 | 2006-03-16 | Morinaga Milk Ind Co Ltd | Plunger pump, sterile homogenizer and homogenization method of particle including liquid |
| CN101520037A (en) * | 2008-12-18 | 2009-09-02 | 浙江工业大学 | Synchronous-isolation plunger pump |
| CN102032170A (en) * | 2010-11-19 | 2011-04-27 | 宁波合力机泵有限公司 | Isolating device for plunger slurry pump |
| US20110239856A1 (en) * | 2010-04-06 | 2011-10-06 | Tiller William J | Plunger Pump Lubrication System and Method |
| CN204663846U (en) * | 2015-03-27 | 2015-09-23 | 宁波合力机泵有限公司 | The fluid end of cylinder-and-piston type reciprocating pump and employing have the cylinder-and-piston type reciprocating pump of this fluid end |
| CN205779529U (en) * | 2016-05-17 | 2016-12-07 | 宁波合力机泵股份有限公司 | A kind of plunger type oil membrane pump |
-
2016
- 2016-05-17 CN CN201610327253.9A patent/CN105822518B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6623259B1 (en) * | 2002-05-06 | 2003-09-23 | George H. Blume | High pressure plunger pump housing and packing |
| JP2006070717A (en) * | 2004-08-31 | 2006-03-16 | Morinaga Milk Ind Co Ltd | Plunger pump, sterile homogenizer and homogenization method of particle including liquid |
| CN101520037A (en) * | 2008-12-18 | 2009-09-02 | 浙江工业大学 | Synchronous-isolation plunger pump |
| US20110239856A1 (en) * | 2010-04-06 | 2011-10-06 | Tiller William J | Plunger Pump Lubrication System and Method |
| CN102032170A (en) * | 2010-11-19 | 2011-04-27 | 宁波合力机泵有限公司 | Isolating device for plunger slurry pump |
| CN204663846U (en) * | 2015-03-27 | 2015-09-23 | 宁波合力机泵有限公司 | The fluid end of cylinder-and-piston type reciprocating pump and employing have the cylinder-and-piston type reciprocating pump of this fluid end |
| CN205779529U (en) * | 2016-05-17 | 2016-12-07 | 宁波合力机泵股份有限公司 | A kind of plunger type oil membrane pump |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109073155A (en) * | 2016-01-29 | 2018-12-21 | 克里奥斯塔股份有限公司 | For distributing the external member of liquefied gas |
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| Publication number | Publication date |
|---|---|
| CN105822518B (en) | 2018-01-16 |
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Address after: 315105, integrity investment Road, Yinzhou District investment center, Ningbo, Zhejiang, Yinzhou 888 Applicant after: Ningbo Heli pump Limited by Share Ltd Address before: 315105 Yinzhou investment and entrepreneurship center, Ningbo, road, No. 888 Applicant before: Heli Mechanical Pump Co., Ltd., Ningbo City |
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Address after: 315105 Yinzhou District investment and entrepreneurship center, Ningbo, road, No. 888 Applicant after: Ningbo Heli pump Limited by Share Ltd Address before: 315105, integrity investment Road, Yinzhou District investment center, Ningbo, Zhejiang, Yinzhou 888 Applicant before: Ningbo Heli pump Limited by Share Ltd |
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