CN103527494A - Self-absorption device for centrifugal pump - Google Patents
Self-absorption device for centrifugal pump Download PDFInfo
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- CN103527494A CN103527494A CN201310460966.9A CN201310460966A CN103527494A CN 103527494 A CN103527494 A CN 103527494A CN 201310460966 A CN201310460966 A CN 201310460966A CN 103527494 A CN103527494 A CN 103527494A
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Abstract
The invention belongs to the field of centrifugal pumps, and particularly relates to a self-absorption device provided with a combined structure and used for a centrifugal pump. The self-absorption device comprises a pump body and a pump shaft part. One end of the pump shaft part is provided with a driving assembly, and the pump shaft part is provided with an impeller part. The self-absorption device further comprises a vacuum self-absorption assembly which is arranged at the other end, opposite to the end where the power driving end is located, of the pump shaft part. The negative pressure pumping end of the vacuum self-absorption assembly is communicated with the water outlet end of the pump body, the air outlet end of the vacuum self-absorption assembly is communicated with the water inlet end of the pump body, and a rotating shaft of the vacuum self-absorption assembly and the axis of the pump shaft part are coaxially arranged. The self-absorption device further comprises a separating part which is used for sealing a pump cavity of the pump body, and bearing fit is formed among/between he pump shaft part and/or the rotating shaft and the separating part. The self-absorption device is reasonable and practical in structural design and easy and convenient to operate, and the actual size of the self-absorption device is effectively reduced while working efficiency is ensured.
Description
Technical field
The invention belongs to centrifugal pump field, be specifically related to a kind of self-priming apparatus for centrifugal pump that has fabricated structure that possesses.
Background technique
In the supply and drain water system and chemical industry of boats and ships, centrifugal self-priming pump is as general service pump kind, and the generality of its use certainly needless to say; And because the space of boats and ships is relatively narrow and small, concentrate and the high property of the pump stature matter of chemicalpump volume compact and relatively small and exquisite vertical pump is obtained and is widely used especially.Yet, birth defect in vertical pump self structure still can not look down upon: due to more than the pump impeller of vertical pump is mostly positioned at the water surface, and it does not possess and only possesses in other words atomic weak self-absorption function when starting, therefore many when centrifugal pump starts, need artificial elder generation to pour water in its pump impeller chamber, thereby make its pump impeller chamber form vacuum environment, can reach the suction object of centrifugal pump, the complicated property of its setting up procedure has obviously affected its actual operating efficiency greatly.Afterwards, people started to arrange external vacuum self-priming apparatus on the basis of existing centrifugal pump again, to reach the strong self-priming object in pump startup stage; But, because needs are arranged extra external vacuum self-priming apparatus, not only can take when mounted the limited space of boats and ships, thereby make the originally limited space of boats and ships or chemical industry more awkward, simultaneously the line arrangement between vacuum self-priming apparatus and centrifugal pump is often all in tumble and be difficult to combing, and due to operator's two covering devices of need to diverting one's attention to open and close when machine startup operates, the control operation difficulty when also just having improved it and starting.In addition, in vertical pump installation process, it is essential that the bearing of pump shaft is installed, and bearing needs extra bearing fixed installation bearing to be used as its fixed base, this just will certainly cause the increase of pump housing axial length, thereby takies the limited space of part and affect the running stability of pumping unit; Meanwhile, because bearing needs lubrication and cooling, traditional vertical pump often needs to be equipped with separately additional lubrication rinse-system, and these have all promoted regular maintenance difficulty and the user cost of whole pumping system greatly.How to seek a kind of simple in structure and centrifugal pump that working efficiency is higher, to solve the many defects in said structure, is those skilled in the art's technical barrier urgently to be resolved hurrily.
Summary of the invention
Object of the present invention, for solving above-mentioned the deficiencies in the prior art, provides a kind of reasonable in design and the practical self-priming apparatus for centrifugal pump, and it is easy and simple to handle, can when guaranteeing centrifugal pump working efficiency, effectively reduce its actual volume.
For achieving the above object, the present invention has adopted following technological scheme:
A kind of self-priming apparatus for centrifugal pump, comprise the pump housing and be arranged in the pump shaft portion in pump housing pump chamber, one end of described pump shaft portion arranges that driven unit is to form its motivational drive end, in pump shaft portion, arrange impeller portion, described self-priming apparatus also comprises vacuum self-priming assembly, described vacuum self-priming arrangement of components is in the other end place with respect to its motivational drive end place end of pump shaft portion, and the negative pressure extracting end of vacuum self-priming assembly is communicated with Chu，Qi outlet side, pump housing waterexit end and is communicated with pump housing feed-water end; The rotating shaft of vacuum self-priming assembly and pump shaft portion axis coaxle layout and pump shaft portion form the power input shaft of its rotating shaft, described self-priming apparatus also comprises for sealing the separator of pump housing pump chamber, between the impeller portion of described separator in vacuum self-priming assembly and pump shaft portion, arrange, on described separator, be provided with for pump shaft portion and/or the interspersed penetration hole of installing of rotating shaft, in described penetration hole, be furnished with bearing portion, between pump shaft portion and/or rotating shaft and separator, form bearing fit.
Bearing portion is sliding bearing, and pump shaft portion and rotating shaft be integral type pump shaft structure, forms sliding bearing and coordinate between this integral type pump shaft structure and separator.
Described vacuum self-priming assembly is vacuum pump, and it comprises that outer casing and base plate enclose the self-priming chamber forming, and arranges between self-priming impeller and self-priming impeller and integral type pump shaft structure and form coaxial affixed matching relationship in self-priming chamber.
The outer casing of vacuum self-priming assembly forms the anti-drive end pump cover of whole vertical centrifugal pump, its negative pressure extracting end and outlet side are opened in the base plate place for reclining and arrange with separator on vacuum self-priming assembly, on described separator, at least arrange the first cavity independent of each other and the second isolation cavity, negative pressure extracting end on vacuum self-priming assembly is communicated in Chu，Qi outlet side, pump housing waterexit end via the first isolation cavity and is communicated in pump housing feed-water end place via the second isolation cavity.
Described base plate profile is hollow multidiameter shaft shape, and interference fit between the vestibule of bearing portion outer wall and hollow multidiameter shaft shape base plate, forms embedded affixed matching relationship between base plate and separator.
On described bearing portion, run through respectively and offer first, second duct, described the first duct treats that through being communicated with the first isolation cavity and bearing portion lubricant housings is to form the liquid medium water outlet lubrication hole of bearing portion, and second hole link the second isolation cavity and bearing portion treat that lubricant housings is to form the liquid medium water inlet lubrication hole of bearing portion.
Described bearing portion in the inner ring wall place axially runs through and offers lubrication groove along it, and described the first duct and/or the second hole link are arranged to lubrication groove place.
The negative pressure extracting end of described vacuum self-priming assembly and outlet side are two and the major diameter end plate face that axially runs through hollow multidiameter shaft shape base plate and arrange, two negative pressure extracting ends and two outlet sides are all arranged axisymmetricly along base plate axis.
The negative pressure extracting stomidium road cross section of described vacuum self-priming assembly is than its stomidium road cross sectional area large 20%～35% of giving vent to anger.
Beneficial effect of the present invention is:
1), on the one hand, by the combination type coaxial between vacuum self-priming assembly and the pump housing, construct, solved the inconvenience arranging at present in making, installation and even the maintenance cost that external vacuum self-priming apparatus certainly leads to, due to the same power structure of line shaft on vacuum self-priming assembly and pump housing pump shaft portion, guaranteed the collaborative between each power part; Power between vacuum self-priming assembly and the pump housing is unitized, and not only overall structure can be more succinct and compact, and operator obviously also can be more convenient simultaneously realizes practical operation, and then has also just guaranteed the practical operation efficiency of whole body.And on the other hand, by abandon conventional construction essential and bearing housing parts that structure is lengthy and tedious, and utilize the project organization of separator, utilizing separator realization sealing pump housing pump chamber, and when guaranteeing the centrifugal vacuum drawn object of centrifugal pump self, separator can be used as again the bearings portion of built-in bearing portion and accomodating unit and uses; The complete built-in structure that bearing portion is arranged in pump housing pump chamber place has effectively reduced the processing technology of the pump housing largely, thereby has played the effect of modular construction and the reduction pump housing axial length of simplifying centrifugal pump; Simultaneously, separator is as the intermediate isolating portion of isolation pump chamber and vacuum self-priming apparatus, bearing portion is set thereon, also guaranteed especially self span of pump shaft portion and/or rotating shaft, avoided because span is excessive, occurring job insecurity phenomenon because of pump shaft portion and/or rotating shaft, to guarantee its functional reliability.
2), need herein be predeclaredly, in fact between the rotating shaft of vacuum self-priming assembly and the pump shaft portion on the pump housing, can there is multiple implementation, or only form the line shaft of vacuum self-priming assembly for the pump shaft portion on the pump housing, during practical operation can and rotating shaft between disconnect voluntarily or plug into, thereby rely on its disconnecting characteristic and realize rotating shaft on vacuum self-priming assembly and even self-priming impeller by demand, open and close object; The present invention is by the integrated design of both pump shaft bodies, that is to say, the pump shaft component that it directly runs through the pump housing and vacuum self-priming assembly and form both simultaneously with an axle, impeller portion on both, self-priming impeller and appurtenances all depend on this pump shaft component and expand and come, its structure is simplicity further obviously, making, installation, assembling and even actual operational speed also can further be promoted, simultaneously compact structure and the area that takes up room is little, convenient actual use; Consider the working stability problem that this pump shaft component occurs because span is long, also by the arrangement of aforesaid bearing portion, avoided, finally to guarantee integrally-built reliable and stable work.
3), consider the extra lengthy and tedious outboard bearing lubricating fitting arranging at present, the present invention is by the duct that bearing portion is treated lubricant housings and first, second isolation cavity of running through of offering in advance, thus the bearing portion uninterrupted selflubricating object of realization when pump shaft portion and rotating shaft rotation; The setting of this kind of self-lubricating structure, has effectively guaranteed self continuous firing of bearing portion, simultaneously simple in structure and practical, the low and high efficiency of maintainability.
4), in fact,, for the as installed structure of bearing portion, with it, can provide said pump shaft assembly with support force.The present invention, by further improveing the actual configuration of base plate, to be designed to hollow multidiameter shaft shape structure, thereby relies on the vestibule of base plate to realize the arrangement object for bearing portion; Like this, separator still indirectly becomes the built-in bearing seat of bearing portion and brings into play its fixation on the one hand, on the other hand, the actual charge and discharge operations of bearing portion becomes very simple, the problems such as replacing maintenance of bearing portion when it come to during practical operation, only need directly extract base plate part and without the integral demounting pump housing, can complete the replacing housekeeping operation of bearing portion, its handling are safeguarded simple and efficiency is high.
5), by vacuum self-priming arrangement of components in the anti-drive end place of the pump housing, also further reasonable structure and the compactedness of having guaranteed after integrated between vacuum self-priming assembly and the pump housing on aforementioned basis just; When the impeller portion of centrifugal pump starts to move, vacuum self-priming assembly also starts to move and produce self-priming effect simultaneously, and finally by each cavity setting in advance, reaches it for the negative pressure self-priming object of centrifugal pump body, and its structure feasibility is good and efficiency is high.
6), actual experiment proves, by the aforesaid restriction to aperture, Yu Qi outlet side, the negative pressure extracting stomidium footpath section area of vacuum self-priming assembly of the present invention, its efficiency of imbibition can be significantly improved, and is conducive to further promote its actual working efficiency.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is that the A-A of structure shown in Fig. 1 is to sectional view;
Fig. 3 is that the B-B of structure shown in Fig. 1 is to sectional view;
Fig. 4 be vacuum self-priming assembly with separator between each lubricated duct position figure of bearing portion after coordinating.
In diagram, each label and physical unit corresponding relation are as follows:
The 10-pump housing 20-impeller 30-of portion separator 31-first isolation cavity 32-the second isolation cavity 41-negative pressure extracting end 42-outlet side 43-outer casing 44-base plate 45-self-priming impeller 50-bearing portion 51-liquid medium water outlet lubrication hole 52-liquid medium water inlet lubrication hole 60-pipeline 70-integral type pump shaft structure
Embodiment
For ease of understanding, below in conjunction with Fig. 1-4 pair concrete structure of the present invention and workflow, do following description:
As shown in Figure 1, the present invention includes vacuum pump, the pump housing 10, pipeline 60.Vacuum pump is connected in series by the integral type pump shaft structure 70 being integrally formed by pump shaft portion and rotating shaft successively with 10 of the pump housings, also: the head end of integral type pump shaft structure 70 connects after aforementioned drive end, postpone again and in the pump housing 10 pump chambers, pass and rely on separator 30 to realize stage casing to fix, the tail end of integral type pump shaft structure 70 forms the rotating shaft of vacuum pump so that affixed self-priming impeller 45, and integral type pump shaft structure 70 head ends with in intersegmental one section of axle body form the holding part of the impeller portion 20 in the pump housing 10.The first isolation cavity 31 independent of each other and the second isolation cavity 32 in separator 30, have been set in advance.During assembling, the negative pressure extracting end 41 of vacuum pump and outlet side 42 isolate after cavity 32 by the isolation cavity 31 of first in separator 30 and second respectively, then through the pipeline 60 arranging in advance, are connected with feed-water end with the waterexit end of the pump housing 10 successively.Before centrifugal pump starts, according to the Environmental Conditions of vacuum pump itself, can take the circumstances into consideration in the self-priming chamber of vacuum pump, to pack in advance a small amount of water (as water ring pump etc. just needs its self-priming chamber to possess part water to reach the airtight object of its pump impeller and perisporium); When pump startup, the self-priming impeller 45 that is arranged on the vacuum pump on integral type pump shaft structure 70 starts rotation, sense of rotation is P, as shown in Figure 2, now, vacuum pump is drawn the gas at the pump housing 10 places, waterexit ends, under the effect alternately changing at vacuum pump self-priming chamber internal volume, as shown in Figure 3 along the first isolation cavity 31, vacuum pump self-priming chamber and the second isolation cavity 32 the most at last its gas discharged to the pump housing 10 feed-water ends; Under the continuous rotation acting of the self-priming impeller 45 of integral type pump shaft structure 70 and vacuum pump, the pump housing 10 place, waterexit ends air are constantly excluded; When pressure is during lower than barometric pressure, water starts automatically to enter the pump housing 10 pump chambers under barometric pressure effect and fills it up with gradually its cavity, finally completes strong imbibition waterflooding flow process; In the pump housing 10 pump chambers of centrifugal pump, liquid medium is filled with and is formed after vacuum environment, can carry out the pump water operation of vertical centrifugal pump.Shaft structure due to integral type pump shaft structure 70, in centrifugal pump life's work process, vacuum pump is also in running order all the time, also be to be to fill with all the time liquid medium in its vacuum pump self-priming chamber, and meanwhile, liquid medium due to vacuum pump extraction, its vacuum pump outlet place pressure is greater than inlet pressure, as shown in Figure 4, therefore liquid medium is able to enter liquid medium water inlet lubrication hole 52 by closing on the second isolation cavity 32 of the outlet side 42 of vacuum pump, and lubrication sliding bearing behind lubricant housings, by liquid medium water outlet lubrication hole 51 places, be expelled to the first isolation cavity 31 places under pressure, between sliding bearing internal ring wall and pump shaft 70 outer walls, matching part lubricates owing to carrying out liquid-circulating by liquid medium all the time, thereby also just realize selflubricating and the cool cycles of bearing portion 50, finally make bearing portion 50 be relied on all the time its self-lubricating structure to realize its lasting efficient operation object.
Vacuum pump can adopt bolt to be as shown in Figure 1 connected with 10 of the pump housings, during practical operation, also the cup-shaped outer casing 43 of vacuum pump directly forms the anti-drive end pump cover of the pump housing 10, the base plate 44 of vacuum pump be configured for the fitting sticking part of separator 30, on base plate 44, corresponding negative pressure extracting end 41 and the outlet side 42 offered is to form the connecting path of respectively isolating cavity in vacuum pump inner chamber and separator 30; Vacuum pump self-priming chamber is for for holding the non-circular slot structure of self-priming impeller 45, to form the vacuum pump cavity that the volume of work alternately changes of relying, thereby is beneficial to the strong self-priming effect that forms the whole pump housing, specifically can be with reference to shown in Fig. 2-3.
Claims (9)
1. the self-priming apparatus for centrifugal pump, comprise the pump housing (10) and be arranged in the pump shaft portion in the pump housing (10) pump chamber, one end of described pump shaft portion arranges that driven unit is to form its motivational drive end, in pump shaft portion, arrange impeller portion (20), it is characterized in that: described self-priming apparatus also comprises vacuum self-priming assembly, described vacuum self-priming arrangement of components is in the other end place with respect to its motivational drive end place end of pump shaft portion, the negative pressure extracting end (41) of vacuum self-priming assembly is communicated with place, the pump housing (10) waterexit end, its outlet side (42) is communicated with the pump housing (10) feed-water end, the rotating shaft of vacuum self-priming assembly and pump shaft portion axis coaxle layout and pump shaft portion form the power input shaft of its rotating shaft, described self-priming apparatus also comprises for sealing the separator (30) of the pump housing (10) pump chamber, described separator (30) is positioned between the impeller portion (20) in vacuum self-priming assembly and pump shaft portion to be arranged, on described separator (30), be provided with for pump shaft portion and/or the interspersed penetration hole of installing of rotating shaft, in described penetration hole, be furnished with bearing portion (50), pump shaft portion and/or rotating shaft and separator form bearing fit between (30).
2. the self-priming apparatus for centrifugal pump according to claim 1, is characterized in that: bearing portion (50) is sliding bearing, and pump shaft portion and rotating shaft be integral type pump shaft structure, forms sliding bearing and coordinate between this integral type pump shaft structure and separator (30).
3. the self-priming apparatus for centrifugal pump according to claim 1 and 2, it is characterized in that: described vacuum self-priming assembly is vacuum pump, it comprises that outer casing (43) and base plate (44) enclose the self-priming chamber forming, and arranges between self-priming impeller (45) and self-priming impeller (45) and integral type pump shaft structure and form coaxial affixed matching relationship in self-priming chamber.
4. the self-priming apparatus for centrifugal pump according to claim 3, it is characterized in that: the outer casing (43) of vacuum self-priming assembly forms the anti-drive end pump cover of whole vertical centrifugal pump, its negative pressure extracting end (41) and outlet side (42) be opened on vacuum self-priming assembly for locating with separator (30) base plate (44) of arranging that reclines, on described separator (30), at least arrange the first cavity independent of each other (31) and the second isolation cavity (32), negative pressure extracting end (41) on vacuum self-priming assembly is communicated in place, the pump housing (10) waterexit end via the first isolation cavity (31), its outlet side (42) is communicated in the pump housing (10) feed-water end place via the second isolation cavity (32).
5. the self-priming apparatus for centrifugal pump according to claim 4, it is characterized in that: described base plate (44) profile is hollow multidiameter shaft shape, interference fit between the vestibule of bearing portion (50) outer wall and hollow multidiameter shaft shape base plate (44), forms embedded affixed matching relationship between base plate (44) and separator (30).
6. the self-priming apparatus for centrifugal pump according to claim 5, it is characterized in that: on described bearing portion (50), run through respectively and offer first, second duct, described the first duct treats that through being communicated with the first isolation cavity (31) and bearing portion (50) lubricant housings is to form the liquid medium water outlet lubrication hole (51) of bearing portion (50), and second hole link the second isolation cavity (32) treats that with bearing portion (50) lubricant housings is to form the liquid medium water inlet lubrication hole (52) of bearing portion (50).
7. the self-priming apparatus for centrifugal pump according to claim 6, is characterized in that: described bearing portion (50) in the inner ring wall place axially runs through and offers lubrication groove along it, and described the first duct and/or the second hole link are arranged to lubrication groove place.
8. the self-priming apparatus for centrifugal pump according to claim 6, it is characterized in that: the negative pressure extracting end (41) of described vacuum self-priming assembly and outlet side (42) are two and the major diameter end plate face that axially runs through hollow multidiameter shaft shape base plate (44) and arrange, two negative pressure extracting ends (41) and two outlet sides (42) are all arranged axisymmetricly along base plate (44) axis.
9. according to the self-priming apparatus for centrifugal pump described in claim 1 or 2 or 3, it is characterized in that: negative pressure extracting end (41) the hole road cross section of described vacuum self-priming assembly is than hole road, its outlet side (42) cross sectional area large 20%～35%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310460966.9A CN103527494B (en) | 2013-09-30 | 2013-09-30 | A kind of self-priming apparatus for centrifugal pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310460966.9A CN103527494B (en) | 2013-09-30 | 2013-09-30 | A kind of self-priming apparatus for centrifugal pump |
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| Publication Number | Publication Date |
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| CN103527494A true CN103527494A (en) | 2014-01-22 |
| CN103527494B CN103527494B (en) | 2015-12-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310460966.9A Active CN103527494B (en) | 2013-09-30 | 2013-09-30 | A kind of self-priming apparatus for centrifugal pump |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09100792A (en) * | 1988-06-30 | 1997-04-15 | Fuji Electric Co Ltd | Vertical shaft pump of suction side self-priming chamber type |
| KR20010010704A (en) * | 1999-07-22 | 2001-02-15 | 김찬원 | Vacuum self- priming pump |
| JP2005248901A (en) * | 2004-03-05 | 2005-09-15 | Ebara Corp | Self-priming pump and self-priming pump device |
| CN1924366A (en) * | 2006-09-15 | 2007-03-07 | 镇江正汉泵业有限公司 | Method for manufacturing valveless siphon prevention vertical self-suction pump |
| CN201068864Y (en) * | 2007-07-20 | 2008-06-04 | 烟台市通用耐腐蚀泵有限公司 | Linked centrifugal sealing self control self priming pump |
| CN202047990U (en) * | 2011-05-14 | 2011-11-23 | 锦州重型水泵有限公司 | Vertical energy-saving self-suction pump |
| CN102338096A (en) * | 2010-07-28 | 2012-02-01 | 温州市康而达实业有限公司 | Vertical self-priming pump |
| US20120315126A1 (en) * | 2011-06-09 | 2012-12-13 | Kim Chan Won | Vacuum self-priming pump |
| CN203604213U (en) * | 2013-09-30 | 2014-05-21 | 合肥工业大学 | Self-absorption device for centrifugal pump |
-
2013
- 2013-09-30 CN CN201310460966.9A patent/CN103527494B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09100792A (en) * | 1988-06-30 | 1997-04-15 | Fuji Electric Co Ltd | Vertical shaft pump of suction side self-priming chamber type |
| KR20010010704A (en) * | 1999-07-22 | 2001-02-15 | 김찬원 | Vacuum self- priming pump |
| JP2005248901A (en) * | 2004-03-05 | 2005-09-15 | Ebara Corp | Self-priming pump and self-priming pump device |
| CN1924366A (en) * | 2006-09-15 | 2007-03-07 | 镇江正汉泵业有限公司 | Method for manufacturing valveless siphon prevention vertical self-suction pump |
| CN201068864Y (en) * | 2007-07-20 | 2008-06-04 | 烟台市通用耐腐蚀泵有限公司 | Linked centrifugal sealing self control self priming pump |
| CN102338096A (en) * | 2010-07-28 | 2012-02-01 | 温州市康而达实业有限公司 | Vertical self-priming pump |
| CN202047990U (en) * | 2011-05-14 | 2011-11-23 | 锦州重型水泵有限公司 | Vertical energy-saving self-suction pump |
| US20120315126A1 (en) * | 2011-06-09 | 2012-12-13 | Kim Chan Won | Vacuum self-priming pump |
| CN203604213U (en) * | 2013-09-30 | 2014-05-21 | 合肥工业大学 | Self-absorption device for centrifugal pump |
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Address after: 230009 Tunxi Road, Anhui, China, No. 193, No. Applicant after: Hefei University of Technology Applicant after: HEFEI HUASHENG VALVE LIMITED BY SHARE LTD. Address before: 230009 Tunxi Road, Anhui, China, No. 193, No. Applicant before: Hefei University of Technology Applicant before: Hefei Huasheng Pumps Valves Co., Ltd. |
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Free format text: CORRECT: APPLICANT; FROM: HEFEI HUASHENG PUMP + VALVE CO., LTD. TO: HEFEI HUASHENG PUMPS + VALVES CO., LTD. |
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