CN108603507A - The sucking shell and multistage immersible pump of multistage immersible pump - Google Patents
The sucking shell and multistage immersible pump of multistage immersible pump Download PDFInfo
- Publication number
- CN108603507A CN108603507A CN201780010440.7A CN201780010440A CN108603507A CN 108603507 A CN108603507 A CN 108603507A CN 201780010440 A CN201780010440 A CN 201780010440A CN 108603507 A CN108603507 A CN 108603507A
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- mentioned
- axis
- immersible pump
- sucking
- multistage
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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
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D11/00—Other rotary non-positive-displacement 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
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D13/08—Units comprising pumps and their driving means the pump being electrically driven for submerged use
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The present invention provides a kind of the sucking shell and multistage immersible pump of multistage immersible pump.In multistage immersible pump, not adding special component just can make to generate pre-rotation to the inflow water of pump.The sucking shell of the multistage immersible pump for the treatment of liquid have along axis extend and centered on axis in the circumferential interval configuration multiple housing main bodies.Using the mutual gap of multiple housing main bodies, multiple suction inlets are circumferentially formed.For multiple suction inlets, in the section with axis vertical take-off, the inflow direction of multiple suction inlets liquid of each is in the direction different from the direction towards axis, the inflow direction of multiple suction inlets liquid of each is formed as, and the inflow direction of the liquid of in multiple suction inlets suction inlet is made to be in the direction for having rotated predetermined angular centered on axis.
Description
Technical field
The present invention relates to the sucking shells of multistage immersible pump.
Background technology
There is known the multistage immersible pump for the treatment of liquid (such as deep-well immersible pumps).For such multistage immersible pump
Speech links in axis direction and multiple stored the shell of impeller in inside and constitute.Such as following patent documents 1 disclose tool
It is standby:It is fixed on the sucking shell of motor in water, is laminated for the multiple of multistage shape with guide vane and on the top of sucking shell
Intermediate case and be installed on topmost intermediate case discharge shell multistage immersible pump.In the multistage immersible pump, from
The water for sucking shell sucking is linearly flowed into intermediate case along axis direction.
Patent document 1:Japanese Unexamined Patent Publication 6-323291 bulletins
Patent document 2:Japanese Unexamined Patent Publication 2005-320869 bulletins
Patent document 3:Japanese Laid-Open utility model Showa 54-24103 bulletins
In multistage immersible pump as described above, usually how to inhibit to lose, improving the efficiency of pump becomes project.In order to inhibit
Loss, it is also desirable to which the water flowed into impeller is linearly flowed in axis direction (direction that the axis of pump is extended).Separately
On the one hand, one of the reason of loss it is stripping of the water in the intermediate case with guide vane.In order to inhibit the stripping, preferably
Avoid water in the extreme variation of water (flow) direction.In multistage immersible pump, the water of rotation ingredient has been applied in by the impeller of paragraph 1
The 2nd section of later intermediate case is flowed to flow into.In order to approach above-mentioned perfect condition, and the inflow water with the rotation ingredient is changed
Become the flow of straight line, but this with water water (flow) direction extreme variation, as a result, easy ting produce stripping.That is, will be to leaf
The flow for taking turns the water flowed into is set as the straight line flow of axis direction to inhibit to lose and avoid water in the extreme variation of water (flow) direction
To inhibit relationship of the loss with compromise selection.
In this way at the water that the water (flow) direction of the water flowed into the intermediate case of paragraph 1 is straight line but is flowed into the 2nd section later
Flow have rotation ingredient multistage immersible pump in, in recent years, on the whole from multistage immersible pump, consider have rotation ingredient
The flow of water occupy leading this case, sometimes can with impeller and in the inflow flow with defined rotation ingredient
The mode for playing highest performance designs the impeller of multistage immersible pump.The impeller designed in this way is also referred to as Rotation Design leaf
Wheel.It is whole as pump, it can be ensured that good efficiency to a certain degree in the multistage immersible pump for having Rotation Design impeller.
However, in Rotation Design impeller, the water (flow) direction of the water flowed into paragraph 1 is different from design optimum condition
Straight line flow, so the poor performance of the 2nd section of later impeller of the performance ratio of the impeller of paragraph 1.Therefore, has Rotation Design impeller
Multistage immersible pump there are rooms for improvement in terms of efficiency.
As one of the method for efficiency for improving the multistage immersible pump for having Rotation Design impeller, consider relative to the 2nd section
Later impeller, the impeller of otherwise designed paragraph 1 are highest can be played relative to the straight line flow without rotation ingredient
Performance.However, in this case, can not be increased using the impeller of same shape, the type of component at each section.As a result, leading
Cause the managerial reduction of increase, high cost, maintenance etc. of manufacturing man-hours.
As the other methods for the efficiency for improving the multistage immersible pump for having Rotation Design impeller, consider to improve outside sucking
Shell, so that the water (flow) direction of the water flowed into paragraph 1 includes rotation ingredient.Rotation ingredient is assigned as the water that flows into pump
Technology, such as there is known above patent documents 2,3.In patent document 2,3, by the rectification that arc-shaped is arranged in suction passage
Plate (weather board) assigns rotation ingredient (also referred to as pre-rotation) to flowing into water.However, additional such cowling panel can lead to device
Complication, high cost, maintenance complication etc..
Based on the above situation, seek in multistage immersible pump, not adding special component just can make the inflow aquatic products to pump
The technology of raw pre-rotation.
Invention content
The present invention is precisely in order to solving at least part of the above subject and completing, such as can be used as form below
To realize.
First form according to the present invention provides a kind of sucking shell of the multistage immersible pump for the treatment of liquid.The sucking
Shell have along axis extend and centered on axis in the circumferential interval configuration multiple housing main bodies.Using more
A mutual gap of housing main body is circumferentially forming multiple suction inlets.For multiple suction inlets, cutd open with axis vertical take-off
In face, the inflow direction of multiple suction inlets liquid of each is in the direction different from the direction towards axis, multiple suckings
The inflow direction of the mouth liquid of each is formed as, and the inflow direction of the liquid of in multiple suction inlets suction inlet is made to be in
The direction of predetermined angular is had rotated centered on axis.
According to above-mentioned sucking shell, the liquid flowed into from multiple suction inlets can form eddy flow.It can make latent to multistage
The liquid that the paragraph 1 of water pump flows into generates pre-rotation.Also, it therefore need not add the components such as cowling panel.
Second form according to the present invention provides a kind of sucking shell of the multistage immersible pump for the treatment of liquid.The sucking
Shell have along axis extend and centered on axis in the circumferential interval configuration multiple housing main bodies.Using more
A mutual gap of housing main body, circumferentially forms multiple suction inlets.Multiple suction inlets are formed as, from multiple suction inlet stream
The liquid entered flows into the direction different with the direction towards the axis in the section from axis vertical take-off and generates eddy flow.According to
Above-mentioned sucking shell realizes the effect with the first homomorphosis.
Third form according to the present invention, in the first or second form, multiple suction inlets are formed as, multiple sucking
The inflow direction of the mouth liquid of each is centered on axis in rotational symmetry.According to above-mentioned form, can generate evenly
Pre-rotation.
4th form according to the present invention, in first~third any one form, sucking shell is also equipped with flange part, should
One or both ends of the flange part on the axis direction of multiple housing main bodies connect multiple housing main body in the circumferential each other
Knot gets up.Easily sucking shell and intermediate case, motor can be linked, so more using flange part according to above-mentioned form
The assembling of section immersible pump becomes easy.
5th form according to the present invention provides a kind of multistage immersible pump for the treatment of liquid.The multistage immersible pump has
The sucking shell of one~the 4th any one form;Motor is configured at the side on the axis direction of sucking shell;And it is intermediate
Shell is configured to multistage in the other side of sucking shell, and stores the impeller driven by motor rotation in each section.According to upper
Multistage immersible pump is stated, realizes the effect with the first~the 4th any one homomorphosis.
Description of the drawings
Fig. 1 is the sectional view of the brief configuration for the multistage immersible pump for being denoted as one embodiment of the present invention.
Fig. 2 is the stereogram for sucking shell.
Fig. 3 is the sectional view along the sucking shell of the line A-A cutting of Fig. 1.
Fig. 4 is the sectional view corresponding with Fig. 3 of the sucking shell as comparative example.
Specific implementation mode
A. embodiment:
Fig. 1 is the sectional view of the brief configuration for the multistage immersible pump 20 for indicating one embodiment of the present invention.Multistage is dived under water
Pump 20 (hereinafter, also referred to as pump 20) in the present embodiment, is set to the deep-well diving that its entirety is submerged in well water
Pump.But pump 20 purposes and be not limited, pump 20 can be treatment liquid arbitrary multistage immersible pump.In addition, hop count can
It is set as 2 or more arbitrary number.
As illustrated, pump 20 has the intermediate case of motor 30, axis 40, sucking shell 100 and connection for multistage
50、60、70.Axis 40 extends along its length in the inside of pump 20, has axis AL.The axis 40 is via shaft coupling 41 and motor 30
Connection.
Sucking shell 100 is configured to coaxial with axis AL.Sucking shell 100 has sucking housing main body 110 and flange
Portion 120,130.Suction inlet 111 is formed with (in the present embodiment, as described later, though being formed with 4 in the sucking shell 100
Suction inlet 111a~111d, but they are referred to as suction inlet 111 herein).For above-mentioned sucking shell 100, axis
The one end in the directions AL is fixed on motor 30 by bolt 125, and another side is fixed on intermediate case 50 by bolt 135.
Intermediate case 50,60,70 is along axis AL using the sequence interlock as multistage from 30 side of motor.In intermediate case
50,60,70 inside is accommodated with impeller 51,61,71 respectively.Impeller 51,61,71 is fixed around axis 40.In addition, in centre
The inside of shell 50,60,70 is provided with guide vane 52,62,72 with connecting with impeller 51,61,71 respectively.
In said pump 20, if drive motor 30, axis 40 rotates together with impeller 51,61,71.As a result, such as arrow A1
Shown water is flowed into from suction inlet 111 into sucking shell 100, and 50 side of shell is flowed towards the middle along axis AL.Moreover, stream
Enter to the water in the intermediate case 50 of paragraph 1 and guide vane 52 is sent to by impeller 51, boosted by guide vane 52, and to
2 sections of intermediate case 60 flows into.Equally, the water for being flowed into the 2nd section of intermediate case 60 is sent to guide vane by impeller 61
62, it is boosted by guide vane 62, and flowed into the 3rd section of intermediate case 70.In this way, the water flowed into from suction inlet 111 is at each section
It is middle to be boosted successively, and it is sent to back segment, the discharge shell linked from the back segment of the intermediate case (not shown) with most back segment
Discharge (not shown).
Fig. 2 is the stereogram for sucking shell 100.Fig. 3 is the sucking along the line A-A cutting of Fig. 1 orthogonal with axis AL
The sectional view of shell 100.As shown in figure 3, sucking shell 100 is in the present embodiment, have 4 sucking housing main body 110a~
110d.As shown in Fig. 2, above-mentioned sucking housing main body 110a~110d extends along axis AL.In addition, as shown in figure 3, sucking is outer
Interval configures shell main body 110a~110d in the circumferential centered on axis AL.Housing main body 110a~110d is sucked at this
In embodiment, there is same shape, section shape to be formed as L-shaped.But suck the shape energy of housing main body 110a~110d
It is enough arbitrarily to set.In addition, in the present embodiment, sucking housing main body 110a~110d is configured to centered on axis AL in rotation
Turn symmetrical.
As shown in figure 3, mutual using the sucking housing main body of the adjoining in above-mentioned sucking housing main body 110a~110d
Gap is circumferentially formed with 4 suction inlet 111a~111d.In the present embodiment, outside due to the sucking with same shape
Shell main body 110a~110d be configured to centered on axis AL in rotational symmetry, so suction inlet 111a~111d be also configured as with
In rotational symmetry centered on axis AL.
As shown in figure 3, suction inlet 111a~111d is formed as the inflow direction of the water in each suction inlet 111a~111d
A2~A5 become from towards the different direction in the direction of axis AL.Since suction inlet 111a~111d is configured in being with axis AL
The heart is in rotational symmetry, so inflow direction A2~A5 of water is also centered on axis AL in rotational symmetry (in the present embodiment, 90
Degree rotational symmetry).
As shown in figure 3, according to inflow direction A2~A5 of above-mentioned suction inlet 111a~111d, can utilize from suction inlet
The water that 111a~111d is flowed into generates eddy flow shown in arrow A6.The water flowed into from suction inlet 111a~111d is with axis AL
Centered on rotate while along axis AL flow, and to the intermediate case of paragraph 1 50 flow into.Therefore, cowling panel etc. is not increased
Component just can make the water flowed into the intermediate case 50 of paragraph 1 generate pre-rotation.As a result, comprising complete including paragraph 1
In the section in portion, the flowing of the water of inflow can be set as eddy flow.Therefore, it is possible to improve the multistage diving for having Rotation Design impeller
The efficiency of pump.Also, in the present embodiment, inflow direction A2~A5 of suction inlet 111a~111d is formed as in being with axis AL
The heart is in rotational symmetry, so pre-rotation evenly can be generated.
It wherein, can be by the water of a suction inlet in suction inlet 111a~111d for inflow direction A2~A5
Inflow direction by as centered on axis AL rotate predetermined angular direction in the way of, arbitrarily set.That is, can
In such a way that the flow direction of the water flowed into from suction inlet does not become the direction for offsetting eddy flow, the stream of each suction inlet is arbitrarily set
Enter direction.In addition, the quantity of suction inlet is not limited to 4,2 or more any amount can be set as.In other words, shell is sucked
The quantity of main body can be set as 3 or more any amount.Also, suck the inner surface (inner surface for forming flow path) of housing main body
Can be set as arbitrary shape, for example, in order to strongly inhibit water flow direction variation drastically, may be alternatively formed to arc-shaped (example
The shape of a part for circle such as centered on axis AL).
In addition, as shown in Fig. 2, sucking shell 100 has flange part 120,130.Flange part 120,130 is formed in axis AL
The both ends of sucking housing main body 110a~110d on direction in the circumferential link sucking housing main body 110a~110d
Come.Flange part 120 is formed in the end of 30 side of motor in sucking housing main body 110a~110d.Flange part 120 circumferentially
It is formed with multiple bolts hole 121.As described above, the bolt hole 121 can be utilized, pass through 125 fixing motor 30 of bolt and sucking
Shell 100.
Flange part 130 is formed in the end of 50 side of intermediate case in sucking housing main body 110a~110d.Flange part 130
Have and the first large-diameter portion 131 of sucking housing main body 110a~110d adjoinings, the second large-diameter portion abutted with intermediate case 50
133 and the first small diameter portion 132 between large-diameter portion 131 and the second large-diameter portion 133.It is circumferentially formed in the second large-diameter portion 133
There are multiple bolts hole 134.Bolt hole 134 is formed in the peripheral surface than small diameter portion 132 close to the position of radial outside.Institute as above
It states, the bolt hole 134 can be utilized, sucking shell 100 and intermediate case 50 are fixed by bolt 135.In addition, by being formed with
Small diameter portion 132 ensures that bolt tightens insertion and the movable area with tool well, so even if orthogonal with axis AL
The forming position of sucking housing main body 110a~110d in plane, also can easily tighten bolt 135.
In addition, as shown in figure 3, being formed with notch 122,123 in flange part 120.Above-mentioned notch 122,123 can as with
Motor 30 connect power cable storage space and be utilized.
Fig. 4 is the sucking shell 200 as comparative example, corresponding with Fig. 3 sectional view.As illustrated, shell is sucked
200 have 4 sucking housing main body 210a~210d of approximate U-shaped, and suction inlet is formed with using the gap between them
211a~211d.Inflow direction A7~A10 of the water of suction inlet 211a~211d becomes towards the direction of axis AL.In above-mentioned suction
Enter in shell 200, do not generate the eddy flow shown in arrow A6 in Fig. 3, the water flowed into from suction inlet 211a~211d is along axis
Linearly shell 50 towards the middle AL.Therefore, sucking shell 200 is used in the multistage immersible pump for having Rotation Design impeller
When, compared with the case where using the sucking shell 100 of the present embodiment, the efficiency of paragraph 1 reduces.
More than, though several embodiments of the invention are described, the embodiment of foregoing invention is in order to just
It is of the invention in understanding, rather than limitation of the invention.The present invention in the case of without departing from the spirit, can be changed,
It improves, and the self-evident present invention includes its equivalent.In addition, in at least part of model that can solve the above subject
It encloses, either can combine or omit technical solution in at least part of range for realizing effect and specification is remembered
The each integral part of load.
The explanation of reference numeral
20 ... multistage immersible pumps
30 ... motors
40 ... axis
41 ... shaft couplings
50,60,70 ... intermediate case
51,61,71 ... impeller
52,62,72 ... guide vane
100 ... sucking shells
110,110a, 110b, 110c, 110d ... suck housing main body
111,111a, 111b, 111c, 111d ... suction inlet
120,130 ... flange parts
121,134 ... bolts hole
122,123 ... notch
125,135 ... bolts
131 ... first large-diameter portions
132 ... small diameter portions
133 ... second large-diameter portions
AL ... axis
Claims (5)
1. a kind of sucking shell is the sucking shell of the multistage immersible pump for the treatment of liquid, wherein
Have along axis extend and centered on above-mentioned axis in the circumferential interval configuration multiple housing main bodies,
Using above-mentioned multiple mutual gaps of housing main body, multiple suction inlets are circumferentially formed along above-mentioned,
For above-mentioned multiple suction inlets, in the section of above-mentioned axis vertical take-off,
The inflow direction of above-mentioned multiple suction inlets aforesaid liquid of each be in from towards the different side in the direction of above-mentioned axis
To,
The inflow direction of above-mentioned multiple suction inlets aforesaid liquid of each is formed as, and makes one in above-mentioned multiple suction inlets to inhale
The inflow direction of the aforesaid liquid of entrance is in the direction that predetermined angular is had rotated centered on above-mentioned axis.
2. a kind of sucking shell is the sucking shell of the multistage immersible pump for the treatment of liquid, wherein
Have along axis extend and centered on above-mentioned axis in the circumferential interval configuration multiple housing main bodies,
Using above-mentioned multiple mutual gaps of housing main body, multiple suction inlets are circumferentially formed along above-mentioned,
Above-mentioned multiple suction inlets are formed as, from multiple suction inlet flow into aforesaid liquid in the section of above-mentioned axis vertical take-off
It is flowed into the direction different from the direction towards the axis and generates eddy flow.
3. sucking shell according to claim 1 or 2, wherein
Above-mentioned multiple suction inlets are formed as, during the inflow direction of multiple suction inlet aforesaid liquid of each is with above-mentioned axis
The heart is in rotational symmetry.
4. the sucking shell according to any one of 1~claim 3 of claim, wherein
It is also equipped with flange part, one or both ends of the flange part on the above-mentioned axis direction of above-mentioned multiple housing main bodies should
Multiple housing main bodies link up in the circumferential each other.
5. a kind of multistage immersible pump is the multistage immersible pump for the treatment of liquid, has:
Sucking shell described in any one of 1~claim 4 of claim;
Motor is configured at the side on the above-mentioned axis direction of above-mentioned sucking shell;And
Intermediate case is configured to multistage in the other side of above-mentioned sucking shell, and storage rotates drive by said motor in each section
Dynamic impeller.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2016-023674 | 2016-02-10 | ||
JP2016023674A JP6624962B2 (en) | 2016-02-10 | 2016-02-10 | Suction casing for multi-stage submersible pump and multi-stage submersible pump |
PCT/JP2017/004148 WO2017138472A1 (en) | 2016-02-10 | 2017-02-06 | Suction casing for multi-stage submersible pump, and multi-stage submersible pump |
Publications (2)
Publication Number | Publication Date |
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CN108603507A true CN108603507A (en) | 2018-09-28 |
CN108603507B CN108603507B (en) | 2020-02-07 |
Family
ID=59563311
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN201780010440.7A Active CN108603507B (en) | 2016-02-10 | 2017-02-06 | Suction housing for multi-stage submersible pump, and multi-stage submersible pump |
Country Status (5)
Country | Link |
---|---|
JP (1) | JP6624962B2 (en) |
CN (1) | CN108603507B (en) |
BR (1) | BR112018016288B1 (en) |
TW (1) | TWI710704B (en) |
WO (1) | WO2017138472A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN109441841B (en) * | 2018-11-17 | 2024-05-07 | 广东瑞荣泵业有限公司 | Space twisted plastic impeller type submersible pump for well |
AT526707A5 (en) * | 2021-11-29 | 2024-04-15 | Morita Corp | Centrifugal pump, centrifugal pump device and fire engine |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3945771A (en) * | 1973-10-16 | 1976-03-23 | Ebara Manufacturing Co., Ltd. | Submerged pump |
CN86204176U (en) * | 1986-06-16 | 1987-06-10 | 中国石化销售公司山西省石油公司 | Multistage horizontal centrifugal pump with induced wheel |
CN1653269A (en) * | 2002-05-15 | 2005-08-10 | 沃迪克有限责任公司 | Multistage pump, particularly of the immersion type |
CN204003610U (en) * | 2013-12-27 | 2014-12-10 | 株式会社易威奇 | Pump fore shell |
KR20150032686A (en) * | 2015-03-09 | 2015-03-27 | 재단법인 중소조선연구원 | Device for guiding impeller suction of centrifugal pump |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5424103U (en) * | 1977-07-21 | 1979-02-16 | ||
JP5021945B2 (en) * | 2006-03-13 | 2012-09-12 | 三菱重工業株式会社 | pump |
CN103163620B (en) * | 2011-12-16 | 2015-01-07 | 佳能企业股份有限公司 | Lens mechanism |
-
2016
- 2016-02-10 JP JP2016023674A patent/JP6624962B2/en active Active
-
2017
- 2017-02-06 WO PCT/JP2017/004148 patent/WO2017138472A1/en active Application Filing
- 2017-02-06 CN CN201780010440.7A patent/CN108603507B/en active Active
- 2017-02-06 BR BR112018016288-4A patent/BR112018016288B1/en active IP Right Grant
- 2017-02-08 TW TW106104070A patent/TWI710704B/en active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3945771A (en) * | 1973-10-16 | 1976-03-23 | Ebara Manufacturing Co., Ltd. | Submerged pump |
CN86204176U (en) * | 1986-06-16 | 1987-06-10 | 中国石化销售公司山西省石油公司 | Multistage horizontal centrifugal pump with induced wheel |
CN1653269A (en) * | 2002-05-15 | 2005-08-10 | 沃迪克有限责任公司 | Multistage pump, particularly of the immersion type |
CN204003610U (en) * | 2013-12-27 | 2014-12-10 | 株式会社易威奇 | Pump fore shell |
KR20150032686A (en) * | 2015-03-09 | 2015-03-27 | 재단법인 중소조선연구원 | Device for guiding impeller suction of centrifugal pump |
Also Published As
Publication number | Publication date |
---|---|
BR112018016288A2 (en) | 2018-12-26 |
JP6624962B2 (en) | 2019-12-25 |
JP2017141735A (en) | 2017-08-17 |
WO2017138472A1 (en) | 2017-08-17 |
BR112018016288B1 (en) | 2023-12-26 |
TWI710704B (en) | 2020-11-21 |
CN108603507B (en) | 2020-02-07 |
TW201730436A (en) | 2017-09-01 |
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