CN105545796A - Mechanical sealing structure for centrifugal pump - Google Patents
Mechanical sealing structure for centrifugal pump Download PDFInfo
- Publication number
- CN105545796A CN105545796A CN201610042554.7A CN201610042554A CN105545796A CN 105545796 A CN105545796 A CN 105545796A CN 201610042554 A CN201610042554 A CN 201610042554A CN 105545796 A CN105545796 A CN 105545796A
- Authority
- CN
- China
- Prior art keywords
- ring
- seat
- axle sleeve
- machine
- seal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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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
- F04D29/10—Shaft sealings
- F04D29/12—Shaft sealings using sealing-rings
- F04D29/126—Shaft sealings using sealing-rings 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
- F04D29/02—Selection of particular materials
- F04D29/026—Selection of particular materials 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
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/043—Shafts
- F04D29/044—Arrangements for joining or assembling shafts
-
- 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
- F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
- F04D29/708—Suction grids; Strainers; Dust separation; Cleaning specially for liquid pumps
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a mechanical sealing structure for a centrifugal pump. The mechanical sealing structure comprises a fixed ring, a movable ring, a mechanical sealing seat and a shaft sleeve, wherein the shaft sleeve is fixedly arranged on a pump shaft in a sleeving manner, a movable ring sealing seat allowing the movable ring to be limited in the movable ring sealing seat is arranged in the shaft sleeve in a sleeving manner, a gap of the mechanical sealing seat is arranged on the shaft sleeve in a sleeving manner, a fixed ring sealing seat allowing the fixed ring to be limited in the fixed ring sealing seat is arranged between the mechanical sealing seat and the shaft sleeve, an axial spring is arranged in the fixed ring sealing seat, and the spring enables the fixed ring to be abutted against the movable ring; radial positioning plates are arranged at the rear end of the mechanical sealing seat; a shaft head loop which is in axial and movable connection with the pump shaft is arranged on a shaft shoulder of the pump shaft in a sleeving manner. According to the mechanical sealing structure disclosed by the invention, a double end surface mechanical seal is changed into a single end surface mechanical seal, and a leakage problem caused by the fracture of a mechanical sealing friction pair is solved, influence of particle media on a movable ring sealing surface and a fixed ring sealing surface is reduced, the service cycle of the pump is prolonged, the expense of spare parts is reduced, and the repairing cost is reduced.
Description
Technical field
The invention belongs to technical field of mechanical, particularly relate to a kind of machine seal structure for centrifugal pump.
Background technique
During hexamethylene diamine is produced, reacting system pressure is higher, and fed sheet of a media is granular mixing reaction material, easily the infringements such as the leakage of mechanical seal, the noise of pump and vibration are caused to the transfer pump for feed back, then directly cause reaction mass can internal leakage in 3O minute totally once appearance, cause parking, occur major accident, require to cause very big hidden danger to steady production and safety and environmental protection.Conventional hexamethylene diamine adopts the end seal high pressure centrifugal pump of traditional design in producing, and with interior flushing and external cooling rinse-system.In real production, discovery machine seals the seal form that former sealing configuration is not suitable for actual conditions, and in pump startup or stopping moment, the front of former end seal seals meeting crackle or fracture to machine; Dynamic and static ring material is not suitable for the mixed medium of particle, and wearing and tearing are very fast; Machine is sealed the material of O ring, easily occurs that size change, wearing and tearing, outside clad damage.
Summary of the invention
The present invention is in order to solve the problems of the prior art, a kind of machine seal structure for centrifugal pump is provided, its machine seal structure is changed in order to single-end surface machine sealing by end seal, and the leakage problem eliminating the friction pair fracture of machine envelope and cause, decrease the impact of granule medium on dynamic and static ring sealing face, extend the life cycle of pump, decrease spare part expense and the cost of overhaul.
For solving the problems of the technologies described above, the present invention adopts following technological scheme: for the machine seal structure of centrifugal pump, comprise stationary ring, rotating ring, machine envelope seat and fixed cover are located at the axle sleeve on pump shaft, described stationary ring gap is enclosed within described axle sleeve, described moving ring sleeve is located on described axle sleeve, on described axle sleeve, fixed cover is provided with spacing for the described rotating ring ring seal seat in it, ring seal seat and described pump shaft are in transmission connection, ring seal seat can drive spacing described rotating ring in it to rotate with pump shaft, described machine envelope seat gap is set on described axle sleeve, the relative pump housing of this machine envelope seat maintains static, be provided with spacing for the described stationary ring stationary ring sealing seat in it between described machine envelope seat and axle sleeve, stationary ring sealing seat and described machine seal seat and are fixedly connected with, axial spring is provided with in stationary ring sealing seat, described stationary ring is resisted against on described rotating ring by spring, the rear end of described machine envelope seat is provided with radial location piece, and location piece and described machine are sealed seat and be connected by positioning screwn, and position corresponding with location piece on described axle sleeve offers the positioning ring groove corresponding with location piece, the shaft shoulder place of described pump shaft is arranged with the spindle nose kink be axially flexibly connected with pump shaft, and spindle nose kink one end is inserted between described axle sleeve and pump shaft.
Restrictor ring is embedded with between described machine envelope seat and axle sleeve.
On described stationary ring sealing seat, the position corresponding with described spring is provided with flushing hole.
An O type seal ring is embedded with between described rotating ring and ring seal seat, the 2nd O type seal ring is embedded with between described stationary ring and stationary ring sealing seat, be embedded with the 3rd O type seal ring between described axle sleeve and pump shaft, between described spindle nose kink and axle sleeve, be embedded with the 4th O type seal ring.
Described axle sleeve is connected by lock screw with pump shaft.
Described lock screw comprises the first lock screw compressing axle sleeve and the first lock screw compressing pump shaft, and the first lock screw and the first lock screw are respectively provided with three, and the first lock screw and the second lock screw interval are arranged.
Described stationary ring and rotating ring are made by cemented carbide.
Described ring seal seat is by as follows for spacing for the rotating ring set-up mode in it: described ring seal seat is fixedly connected with rotating ring.
Beneficial effect of the present invention:
Be provided with spacing for the described stationary ring stationary ring sealing seat in it between described machine envelope seat and axle sleeve; stationary ring sealing seat and described machine seal seat and are fixedly connected with; axial spring is provided with in stationary ring sealing seat; described stationary ring is resisted against on described rotating ring by spring; spring design, in the protection of stationary ring sealing seat, eliminates the auto-compensation affecting spring because of the accumulation of granule medium.
On described stationary ring sealing seat, the position corresponding with described spring is provided with flushing hole, prevents particulate matter from piling up stuck spring and causes spring and follow the string, and can not ensure the wear extent of machine envelope decrement, bumper and absorbing shock and friction compensation pair.
The front end sleeve of described pump shaft is provided with the spindle nose kink be flexibly connected with pump shaft, spindle nose kink inserts between described axle sleeve and pump shaft, machine envelope front end have employed spindle nose kink, spindle nose kink and pump shaft run-in synchronism, it can auto-compensation spindle nose location dimension, decreases because spindle nose location is inaccurate and causes machine to seal the appearance of problem and the machine leak sealing point installed.
The rear end of described machine envelope seat is provided with radial location piece, location piece and described machine are sealed seat and are connected by positioning screwn, position corresponding with location piece on described axle sleeve offers the positioning ring groove corresponding with location piece, location piece and positioning ring groove with the use of, ensure that machine envelope is preliminary and install and the pre compressed magnitude of machine envelope.
An O type seal ring is embedded with between described rotating ring and ring seal seat, the 2nd O type seal ring is embedded with between described stationary ring and stationary ring sealing seat, the 3rd O type seal ring is embedded with between described axle sleeve and pump shaft, be embedded with the 4th O type seal ring between described spindle nose kink and axle sleeve, ensure that the sealing effect between each parts.
Described stationary ring and rotating ring are made by cemented carbide, former mechanical seal dynamic and static ring material is graphite and silicon carbide, after use, there will be the groove mark of wearing and tearing, there is the phenomenon of stationary ring color change simultaneously, dynamic and static ring material changed to cemented carbide, sealing surface precision and hardness be improved, decrease the impact of granule medium on dynamic and static ring sealing face, improve the sealability of machine envelope primary seal point.
Be embedded with restrictor ring between described machine envelope seat and axle sleeve, reduce as auxiliary seal and leak.Described ring seal seat is by as follows for spacing for the rotating ring set-up mode in it: described ring seal seat is fixedly connected with rotating ring, and this set-up mode is convenient to the installation of rotating ring.Described axle sleeve is connected by lock screw with pump shaft, lock screw comprises the first lock screw compressing axle sleeve and the second lock screw compressing pump shaft, first lock screw and the second lock screw are respectively provided with three, and the first lock screw and the second lock screw interval are arranged, this design ensures that machine envelope installs rear dynamic and static ring and aligns with one heart and the accurate compression compensation rate of machine envelope, ensures that axle sleeve and the rotating ring that is arranged on axle sleeve are with pump shaft run-in synchronism simultaneously.
Machine seal structure of the present invention becomes operation period prolongation by the end seal change being not suitable with system high pressure solid-liquid mixed media operating mode and stablizes leak free single-end surface machine sealing, the present invention is applicable to high pressure, the solid-liquid mixed media of normal pressure and low pressure, vapour-liquid mixed medium and pure liquid mixed medium operating mode, and eliminate because rinse-system working condition requirement is high, end seal structural imperfection and cause on high-tension side machine to seal friction pair fracture and the leakage problem that causes, decrease granule medium to dynamic and static ring sealing face, spring, the impact of O type seal ring, extend the life cycle of pump, eliminate the safety and environmental protection hidden danger in device production process, decrease spare part expense and the cost of overhaul, reduce the labor intensity of maintainer.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the structure right elevation of Fig. 1.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated.
As depicted in figs. 1 and 2, machine seal structure for centrifugal pump of the present invention, comprise stationary ring 3, rotating ring 5, machine envelope seat 2 and fixed cover are located at the axle sleeve 1 on pump shaft 8, described stationary ring 3 gap is enclosed within described axle sleeve 1, described rotating ring 5 is set on described axle sleeve 1, on described axle sleeve 1, fixed cover is provided with spacing for the described rotating ring 5 ring seal seat 6 in it, ring seal seat 6 and described pump shaft 8 are in transmission connection, ring seal seat 6 can drive spacing described rotating ring 5 in it to rotate with pump shaft 8, described machine envelope seat 2 gap is set on described axle sleeve 1, this machine envelope seat 2 relatively pump housing maintains static.
Be provided with spacing for the described stationary ring 3 stationary ring sealing seat 4 in it between described machine envelope seat 2 and axle sleeve 1; stationary ring sealing seat 4 and described machine seal seat 2 and are fixedly connected with; axial spring 7 is provided with in stationary ring sealing seat 4; described stationary ring 3 is resisted against on described rotating ring 5 by spring 7; spring 7 designs in the protection of stationary ring sealing seat 4, eliminates the auto-compensation affecting spring because of the accumulation of granule medium.And the position corresponding with described spring 7 is provided with flushing hole on stationary ring sealing seat 4, prevent from particulate matter from piling up stuck spring 7 to cause spring and follow the string, and the wear extent (flushing hole does not indicate in the accompanying drawings) of machine envelope decrement, bumper and absorbing shock and friction compensation pair can not be ensured.
The rear end of described machine envelope seat 2 is provided with radial location piece 9, location piece 9 and described machine are sealed seat 2 and are connected by positioning screwn 1O, on described axle sleeve 1, the position corresponding with location piece 9 offers the positioning ring groove 18 corresponding with location piece 9, location piece 9 and positioning ring groove 18 with the use of, ensure that machine envelope is preliminary and install and the pre compressed magnitude of machine envelope.When machine is enclosed in and axle sleeve is installed, location piece 9 snaps in positioning ring groove 18, and realize the pre compressed magnitude of rotating ring and stationary ring in machine envelope, the machine of completing is enclosed on axle sleeve and tentatively installs; Axle sleeve with machine envelope is set on pump shaft, after axle sleeve and pump shaft are fixed and positioned by lock screw, rotates location piece 9, makes it be separated with positioning ring groove 18.
The shaft shoulder place of described pump shaft 8 is arranged with the spindle nose kink 16 be axially flexibly connected with pump shaft 8, spindle nose kink 16 inserts between described axle sleeve 1 and pump shaft 8, machine envelope front end have employed spindle nose kink 16, spindle nose kink 16 and pump shaft 8 run-in synchronism, spindle nose kink 16 can auto-compensation spindle nose location dimension, decreases because spindle nose location is inaccurate and causes machine to seal the appearance of problem and the machine leak sealing point installed.
Described stationary ring 3 is made by cemented carbide with rotating ring 5, former mechanical seal dynamic and static ring material is graphite and silicon carbide, after use, there will be the groove mark of wearing and tearing, there is the phenomenon of stationary ring color change simultaneously, dynamic and static ring material changed to cemented carbide, sealing surface precision and hardness be improved, decrease the impact of granule medium on dynamic and static ring sealing face, improve the sealability of machine envelope primary seal point.
Be embedded with restrictor ring 17 between described machine envelope seat 2 and axle sleeve 1, reduce as auxiliary seal and leak.Described ring seal seat 6 is by as follows for spacing for rotating ring 5 set-up mode in it: described ring seal seat 6 is fixedly connected with rotating ring 5, and this set-up mode is convenient to the installation of rotating ring 5.
Described axle sleeve 1 is connected by lock screw with pump shaft 8, lock screw comprises the first lock screw 151 compressing axle sleeve and the second lock screw 152 compressing pump shaft, first lock screw 151 and the second lock screw 152 are respectively provided with three, and the first lock screw 151 and the second lock screw 152 interval are arranged, this design ensures that machine envelope installs rear dynamic and static ring and aligns with one heart and the accurate compression compensation rate of machine envelope, ensures that axle sleeve and the rotating ring that is arranged on axle sleeve are with pump shaft run-in synchronism simultaneously.
An O type seal ring 11 is embedded with between described rotating ring 5 and ring seal seat 6, the 2nd O type seal ring 12 is embedded with between described stationary ring 3 and stationary ring sealing seat 4, the 3rd O type seal ring 13 is embedded with between described axle sleeve 1 and pump shaft 8, the 4th O type seal ring 14 is embedded with between described spindle nose kink 16 and axle sleeve 1, one O type seal ring 11 adopts the complete coated circle of tetrafluoro and EPDM, 2nd O type seal ring 12 adopts tetrafluoro O ring, 3rd O type seal ring 13 adopts the material of Ethylene Propylene Terpolymer, namely the requirement of dielectric corrosion is met, again with certain elasticity, for installation and replacing bring convenience, 4th O type seal ring adopts tetrafluoro material, simultaneously according to plane and the step of sealing, increase thickness.O type seal ring of the present invention is relative to traditional clad structure form by the tetrafluoro skin fluoridize glue part of two lobe make-ups, and improve sealing, wear resistance and stability, its outside clad is not fragile.
Machine seal structure of the present invention becomes operation period prolongation by the end seal change being not suitable with system high pressure solid-liquid mixed media operating mode and stablizes leak free single-end surface machine sealing, the present invention is applicable to high pressure, the solid-liquid mixed media of normal pressure and low pressure, vapour-liquid mixed medium and pure liquid mixed medium operating mode, and eliminate because rinse-system working condition requirement is high, end seal structural imperfection and cause on high-tension side machine to seal friction pair fracture and the leakage problem that causes, decrease granule medium to dynamic and static ring sealing face, spring, the impact of O type seal ring, extend the life cycle of pump, eliminate the safety and environmental protection hidden danger in device production process, decrease spare part expense and the cost of overhaul, reduce the labor intensity of maintainer.
The present invention for successfully completing the improvement of end seal to single-end surface machine sealing by above-mentioned improvement, stable in actual use, vibration and noise disappear, and machine seals continuous operation and has no leakage over one year, and the flow of pump, pressure and other parameters normal operation, meet the usage requirement of field working conditions.
The present invention is by the improvement to the mechanical seal structure of this special operation condition pump, and the working life that new machine is sealed seal structure reaches prolongation, and sealing effect is good, and maintenance and cost of production reduce greatly, eliminates in device steady production and obtains considerable safety and environmental protection hidden danger.This invention removes the destabilizing factor in hexamethylene diamine plant running, tremendous contribution has been made to equipment safety environmental protection and energy-saving and cost-reducing work, for the high load running of safe and stable arrangement long period lays a solid foundation.
Above embodiment is the technological scheme of unrestricted the present embodiment in order to explanation only, although with reference to above-described embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: still can modify to the present invention or equivalent replacement, and not departing from any modification or partial replacement of the spirit and scope of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (8)
1. for the machine seal structure of centrifugal pump, comprise stationary ring, rotating ring, machine envelope seat and fixed cover are located at the axle sleeve on pump shaft, described stationary ring gap is enclosed within described axle sleeve, described moving ring sleeve is located on described axle sleeve, on described axle sleeve, fixed cover is provided with spacing for the described rotating ring ring seal seat in it, ring seal seat and described pump shaft are in transmission connection, ring seal seat can drive spacing described rotating ring in it to rotate with pump shaft, described machine envelope seat gap is set on described axle sleeve, the relative pump housing of this machine envelope seat maintains static, it is characterized in that: be provided with spacing for the described stationary ring stationary ring sealing seat in it between described machine envelope seat and axle sleeve, stationary ring sealing seat and described machine seal seat and are fixedly connected with, axial spring is provided with in stationary ring sealing seat, described stationary ring is resisted against on described rotating ring by spring, the rear end of described machine envelope seat is provided with radial location piece, and location piece and described machine are sealed seat and be connected by positioning screwn, and position corresponding with location piece on described axle sleeve offers the positioning ring groove corresponding with location piece, the shaft shoulder place of described pump shaft is arranged with the spindle nose kink be axially flexibly connected with pump shaft, and spindle nose kink one end is inserted between described axle sleeve and pump shaft.
2. the machine seal structure for centrifugal pump according to claim 1, is characterized in that: be embedded with restrictor ring between described machine envelope seat and axle sleeve.
3. the machine seal structure for centrifugal pump according to claim 1 and 2, is characterized in that: on described stationary ring sealing seat, the position corresponding with described spring is provided with flushing hole.
4. the machine seal structure for centrifugal pump according to claim 3, it is characterized in that: between described rotating ring and ring seal seat, be embedded with an O type seal ring, the 2nd O type seal ring is embedded with between described stationary ring and stationary ring sealing seat, be embedded with the 3rd O type seal ring between described axle sleeve and pump shaft, between described spindle nose kink and axle sleeve, be embedded with the 4th O type seal ring.
5. the machine seal structure for centrifugal pump according to claim 1, is characterized in that: described axle sleeve is connected by lock screw with pump shaft.
6. the machine seal structure for centrifugal pump according to claim 5, it is characterized in that: described lock screw comprises the first lock screw compressing axle sleeve and the first lock screw compressing pump shaft, first lock screw and the first lock screw are respectively provided with three, and the first lock screw and the second lock screw interval are arranged.
7. the machine seal structure for centrifugal pump according to claim 1, is characterized in that: described stationary ring and rotating ring are made by cemented carbide.
8. the machine seal structure for centrifugal pump according to claim 1, is characterized in that: described ring seal seat is by as follows for spacing for the rotating ring set-up mode in it: described ring seal seat is fixedly connected with rotating ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610042554.7A CN105545796A (en) | 2016-01-22 | 2016-01-22 | Mechanical sealing structure for centrifugal pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610042554.7A CN105545796A (en) | 2016-01-22 | 2016-01-22 | Mechanical sealing structure for centrifugal pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105545796A true CN105545796A (en) | 2016-05-04 |
Family
ID=55825237
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610042554.7A Pending CN105545796A (en) | 2016-01-22 | 2016-01-22 | Mechanical sealing structure for centrifugal pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105545796A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201225316Y (en) * | 2008-07-18 | 2009-04-22 | 李学庆 | Assembling type mechanical seal apparatus for multi-point flushing desulfurization device |
| CN201412386Y (en) * | 2009-06-30 | 2010-02-24 | 蒋敏 | Desulfurization peripheral pump mechanical seal |
| US20100148448A1 (en) * | 2008-12-12 | 2010-06-17 | Pradeep Pinto | Pump seal |
| CN102116309A (en) * | 2010-12-30 | 2011-07-06 | 上海阿波罗机械股份有限公司 | Mechanical sealing device for centrifugal pump |
| CN204099265U (en) * | 2014-08-12 | 2015-01-14 | 浙江科尔泵业股份有限公司 | The voltage regulation type unit loading type mechanical shaft seal assembly of centrifugal pump |
| CN205298040U (en) * | 2016-01-22 | 2016-06-08 | 河南神马尼龙化工有限责任公司 | A a machine structure for centrifugal pump |
-
2016
- 2016-01-22 CN CN201610042554.7A patent/CN105545796A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201225316Y (en) * | 2008-07-18 | 2009-04-22 | 李学庆 | Assembling type mechanical seal apparatus for multi-point flushing desulfurization device |
| US20100148448A1 (en) * | 2008-12-12 | 2010-06-17 | Pradeep Pinto | Pump seal |
| CN201412386Y (en) * | 2009-06-30 | 2010-02-24 | 蒋敏 | Desulfurization peripheral pump mechanical seal |
| CN102116309A (en) * | 2010-12-30 | 2011-07-06 | 上海阿波罗机械股份有限公司 | Mechanical sealing device for centrifugal pump |
| CN204099265U (en) * | 2014-08-12 | 2015-01-14 | 浙江科尔泵业股份有限公司 | The voltage regulation type unit loading type mechanical shaft seal assembly of centrifugal pump |
| CN205298040U (en) * | 2016-01-22 | 2016-06-08 | 河南神马尼龙化工有限责任公司 | A a machine structure for centrifugal pump |
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Application publication date: 20160504 |