GB2320061A - A pump with two outlets - Google Patents
A pump with two outlets Download PDFInfo
- Publication number
- GB2320061A GB2320061A GB9720975A GB9720975A GB2320061A GB 2320061 A GB2320061 A GB 2320061A GB 9720975 A GB9720975 A GB 9720975A GB 9720975 A GB9720975 A GB 9720975A GB 2320061 A GB2320061 A GB 2320061A
- Authority
- GB
- United Kingdom
- Prior art keywords
- warm water
- impeller
- pipes
- valve member
- pipe
- 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.)
- Withdrawn
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 93
- 238000007599 discharging Methods 0.000 claims description 4
- 230000002146 bilateral effect Effects 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 abstract description 14
- 230000002441 reversible effect Effects 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000002730 additional effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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
- F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D1/02—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps having non-centrifugal stages, e.g. centripetal
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0005—Control, e.g. regulation, of pumps, pumping installations or systems by using valves
- F04D15/0016—Control, e.g. regulation, of pumps, pumping installations or systems by using valves mixing-reversing- or deviation valves
-
- 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
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/44—Fluid-guiding means, e.g. diffusers
- F04D29/46—Fluid-guiding means, e.g. diffusers adjustable
- F04D29/48—Fluid-guiding means, e.g. diffusers adjustable for unidirectional fluid flow in reversible pumps
- F04D29/486—Fluid-guiding means, e.g. diffusers adjustable for unidirectional fluid flow in reversible pumps especially adapted for liquid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
- F24D3/105—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system pumps combined with multiple way valves
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Steam Or Hot-Water Central Heating Systems (AREA)
- Cookers (AREA)
Abstract
A pump for supplying warm water in a heating system selectively through a pair of outlet pipes P1, P2, comprises a reversible impeller 34, and a valve member 32 which is pivoted in dependence on the direction of rotation of the impeller to block one or the other of the outlet pipes. The valve member may take the form of a pivoted plate (42, Figure 5).
Description
1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 is 16 17 18 19 20 21 22 23 24 25
2320061 WARM WATER CIRCULATING PUMP FOR SUPPLYING WARM WATER SELECTIVELY THROUGH A PAIR OF PIPES
Background of the Invention
1. Field of the Invention
The present invention relates to a warm water circulating pump, and more particularly to a pump for supplying warm water spouted by an impeller through a pair of pipes according to rotational directions of the impeller.
2. Prior Art
A pump 10 for circulating warm water in a boiler system has, as shown in FIG. 1, a motor housing 12 for accommodating a motor assembly and a pump housing 11 for accommodating water. The motor assembly installed in the motor housing 12 comprises a stator 18, a rotor 17, and a rotational shaft 13 inserted into the rotor 17 by force. The rotational shaft 13 is supported by the first bearing 15 and the second bearing 16. At the end part of the rotational shaft 13, an impeller 14 is assembled. The impeller 14 is disposed in the pump housing 11.
When the motor assembly is supplied with electric power, the rotor 17 is rotated by the magnetic force generated between the rotor 17 and the stator 18, 2 1 2 3 4 5 7 8 9 10 11 12 13 14 is 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 and then the rotational shaft 13 and the impeller 14 assembled with the rotational shaft 13 are rotated by the rotor 17. When the impeller 14 is rotated, the water accommodated in the pump housing 11 is pumped out.
FIG. 2 is a schematic view of a boiler system driven by the warm water circulating pump shown in FIG. 1. A general boiler system has a warm water pipe 24 for supplying warm water, a heating pipe 25 for heating operation, a water supply tank 27 for compensating consumed water, and a three-way valve 26 for converting operating modes between warm water supplying operation and heating operation.
When the warm water supplying operation and the heating operation are performed simultaneously, the warm water discharged from the pump 10 circulates along the route designated by the dotted arrow through the warm water pipe 24, the three-way valve 26, the heating pipe 25 and the pump 10, but when only the warm water supplying operation is performed, the warm water discharged from the pump 10 circulates, along the route designated by the solid arrow, through the warm water pipe 24, the threeway valve 26 and the pump 10. The conversion between two such kinds of operations are performed by the three-way valve 26. That is, when both the warm water supplying operation and the heating operation are performed, the three-way valve 26 supplies the warm water from the warm water pipe 24 to the heating pipe 25, and when only the warm water supplying operation is performed, the three-way valve 26 supplies the warm water from the warm water pipe 24 to the pump 10.
In such a boiler system, there is a shortcoming that the three-way valve 26 is indispensable to convert the operating mode. To overcome such a shortcoming, a warm water circulating pump having a valve device has 3 1 2 3 4 5 6 7 8 9 10 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 been proposed, in which a pair of pipes for discharging warm water are installed, and the warm water is selectively supplied through the pipes by the valve device.
FIGs. 3a and 3b are sectional views of conventional warm water circulating pumps having a three-way valve function. In FIG. 3a, the pump housing 21 of the pump 30 is formed with a pair of pipes Pl,P2 for discharging warm water and an inflow pipe (not shown) for providing a passage through which water flows in. The warm water flowing out through the first pipe P1 is supplied to the warm water pipe 24, and the warm water flowing out through the second pipe P2 is supplied to the warm water pipe 24 and the heating pipe 25. Therefore, the warm water supplying operation is performed when the first pipe P1 is opened and the second pipe P2 is closed, and heating and warm water supplying operations are performed when the second pipe P2 is opened and the first pipe P1 is closed.
At the entrance of the first and the second pipes Pl,P2, a diaphragm valve 22 is installed. The diaphragm valve 22 is stretched left or right according to the rotational direction of the impeller 14, whereby the first pipe P1 or the second pipe P2 is closed. In other words, if the impeller 14 rotates counterclockwise, the diaphragm valve 22 is stretched left to close the first pipe P1 located in the left as shown in the dotted line, and if the impeller 14 rotates clockwise, the diaphragm valve 22 is stretched right to close the second pipe P2 located in the right. Thus, the operating mode of the boiler system is converted according to the conversion of the rotational direction of the impeller 14.
However, in such a conventional warm water circulating pump, there are the problems that cavitation may occur around the diaphragm valve 22 4 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 whereby the circulating power of the warm water becomes weak, and the closing of the pipes by the diaphragm valve 22 may not be steady.
In FIG. 3b, another conventional warm water circulating pump is shown in which the pipes Pl,P2 are selectively opened by a ball valve 23. The ball valve 23 is movably installed to the left and the right, and it closes the first pipe P1 when it is moved to the left and closes the second pipe P2 when it is moved to the right. If the impeller 14 rotates counterclockwise, the ball valve 23 moves to the left by the water flow generated during the rotation of the impeller 14, whereby the warm water circulates through the second pipe P2, and if the impeller 14 rotates clockwise, the ball valve 23 moves to the right by the water flow generated during the rotation of the impeller 14, whereby the warm water circulates through the first pipe Pl.
However, in such a warm water circulating pump, impurities may adhere to the ball valve 23 if it is used for a long time, so the movement of the ball valve 23 to the left and the right is not smooth but rough. Thus the function for converting the warm water supplying direction may become bad.
Summary of the invention
The present invention has been proposed to overcome the above described problems in the prior art, and accordingly it is an object of the present invention to provide a warm water circulating pump for use in a boiler system which is possible to convert the warm water circulating direction without the additional three-way valve, whereby the operating mode thereof is easily converted. Also, another object of the present invention is to provide a warm water circulating pump in which the cavitation does not occur when the warm
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 1 water is discharged, and the valving operation is smoothly performed.
To achieve the above object, the present invention provides a warm water circulating pump comprising: a motor assembly installed in a housing; an impeller installed in said housing to be rotatable at bilateral directions by said motor assembly, said impeller for discharging water flowed into said housing; first and second pipes formed at said housing, said pipes for providing a passage through which the water is discharged by said impeller; and a valve member pivotably fixed by a hinge pin at an adjacent area to an entrance of said first and second pipes, said valve member being pivoted by water flow generated by the rotation of said impeller, said valve member selectively closing said first and second pipes according to rotational directions of said impeller to discharge water through an opened pipe among said pipes.
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 Brief Description of the Drawings
The present invention will be better understood and its various objects and advantages will be more fully appreciated from the following description taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a side sectional view of a conventional warm water circulating pump, FIG. 2 is a schematic view of a boiler system driven by the warm water circulating pump shown in FIG. 1 ' FIGs. 3a and 3b are sectional views of conventional warm water circulating pumps having a three-way valve function, FIG. 4 is a sectional view of a warm water circulating pump according to an embodiment of the 6 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 present invention, FIG. 5 is a sectional view of a warm water circulating pump according to another embodiment of the present invention, and FIG. 6 is a schematic view of a boiler system driven by the warm water circulating pumps in FIGs. 4 and 5.
Detailed Description of the Preferred Embodiment
Hereinafter, the present invention will be described in detail with reference to the drawings. The description of the same parts with those of the conventional warm water circulating pump is abbreviated or briefly described.
FIG. 4 is a sectional view of a warm water circulating pump according to an embodiment of the present invention. The constitution of the pump housing 31 and the impeller 34 is the same with that of the conventional pump housing 21 and impeller 14 illustrated in FIGs. 3a and 3b. That is, the pump housing 31 is formed with the first pipe P1 connected to the warm water pipe, the second pipe P2 connected with the warm water pipe and the heating pipe, and the inflow pipe (not shown) providing the passage through which water flows into the pump housing 31. In the pump housing 31, the impeller 34 for circulating the warm water through the first and the second pipes Pl,P2 is disposed. At the central area of the impeller 34, a port 34a for drawing the warm water flowed in the pump housing 31 through the inflow pipe (not shown) is formed. The water drawn through the port 34a is discharged through the pipes Pl,P2 when the impeller 34 rotates.
At an adjacent area to the first and the second pipes Pl,P2 in the pump housing 31, a valve member 32 is installed. The valve member 32 is pivotably fixed 7 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 by a hinge pin 33. The valve member 32 pivots by the water flow generated by the impeller 34 when the impeller 34 rotates. That is, if the impeller 34 rotates counterclockwise, the valve member 32 pivots left, and if the impeller 34 rotates clockwise, the valve member 32 pivots right.
The valve member 32 is formed so that the cross section thereof has a triangular shape. In that situation, the hinge pin 33 is installed at the upper vertex area of the valve member 32, and the side facets corresponding to side edges of the triangle open/close the entrance of the pipes Pl,P2 according to the pivoting position of the valve member 32. Therefore, if the valve member 32 pivots left, the first pipe P1 is closed by the left facet of the valve member 32 and the second pipe P2 is opened, and if the valve member 32 pivots right, the second pipe P2 is closed by the right facet of the valve member 32 and the first pipe P1 is opened. Accordingly, the pipes Pl,P2 are selectively opened, and then the warm water is discharged through the opened pipe among the pipes Pl,P2.
In the pivoted state of the valve member 32, there is a possibility that the impeller 34 strikes against the lower end of the valve member 32 if the lower end of the valve member 32 is disposed in the range of rotational radius of the impeller 34. To prevent such a phenomenon, the impeller 34 and the valve member 32 are disposed not to stand in the same plane. In the drawings, although the lower end part of the valve member 32 seems to interfere with rotation of the impeller 34 when the valve member 32 is pivoted, there is no interference between the impeller 34 and the valve member 32 in fact since those are disposed at different planes from each other. Also, the interference between them can be prevented by 8 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 manufacturing the impeller 34 with a flexible material. If the impeller 34 is made of the flexible material, the ends of the wings of the impeller 34 will be bent by the resisting force of the water when the impeller 34 rotates. Thus the range of the rotational radius of the impeller 34 becomes small, so no interference occurs between them. According to such a manner, there is no need to dispose the impeller 34 and the valve member 32 at the different plane from each other. Also, when the impeller 34 begins to rotate after being stopped, the valve member 32 is pivoted by the wings of the impeller 34, so the opening/closing of the pipes Pl,P2 is performed more exactly, and the pivoting force of the valve member 32 becomes stronger. Thus, the additional effect that the selective opening/closing by the valve member 32 can be achieved.
FIG. 5 is a sectional view of a warn water circulating pump according to another embodiment of the present invention. In the present embodiment, the valve member is a plate 42. The plate 42 is fixed by a hinge pin 43 at the central part thereof. The first and second pipes Pl,P2 are selectively opened/closed by the side planes of the plate 42. The opening/closing mechanism of the pipes Pl,P2 by the plate 42 is the same with that of the valve member 32 in the embodiment shown in FIG. 4.
As illustrated in the embodiments shown in FIGs. 4 and 5, since the valve member pivots on the hinge pin to open/close the pipes, the problems such as the cavitation by the diaphragm or the malfunction of the valving operation of the ball valve do not occur.
FIG. 6 is a schematic view of a boiler system driven by the warm water circulating pumps shown in FIGs. 4 and 5. The boiler system comprises the warm water circulating pump 30, the warm water pipe 54, the heating pipe 55, and the water supply tank 57. When 9 1 2 3 4 5 6 7 8 9 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 the warm water supplying operation and heating operation are performed simultaneously, the warm water discharged from the pump 30 circulates to the pump 30 along the route designated by the dotted arrow through the heating pipe 55 and the warm water pipe 54, but when only the warm water supplying operation is performed, the warm water discharged from the pump 30 circulates to the pump 30, along the route designated by the solid arrow, through the warm water pipe 54. Since the circulating route of the warm water is converted by the valve device employed in the pump 30, the boiler system doesn't require the additional three-way valve.
As described above, according to the present invention, the warm water circulating direction can be easily converted without the additional three-way valve, and the valve device performing such a conversion operates smoothly.
Although the present invention has been described and illustrated in detail, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, wherein the spirit and scope of the present invention is limited only by the terms of the appended claims.
1 2 3 4 6 7 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Claims (3)
1. A warm water circulating pump comprising: a motor assembly installed in a housing; an impeller installed in said housing to be rotatable at bilateral directions by said motor assembly, said impeller for discharging water flowed into said housing; first and second pipes formed at said housing, said pipes for providing a passage through which the water is discharged by said impeller; and a valve member pivotably fixed by a hinge pin at an adjacent area to an entrance of said first and second pipes, said valve member being pivoted by water flow generated by the rotation of said impeller, said valve member selectively closing said first and second pipes according to rotational directions of said impeller to discharge water through an opened pipe among said pipes.
2. The warm water circulating pump as claimed in claim 1, wherein said valve member has a triangular cross section in which a vertex thereof is rotatably fixed by said hinge pin, and said pipes are selectively closed by facets corresponding to side edges thereof.
3. The warm water circulating pump as claimed in claim 1, wherein said valve member is a plate in which a centre thereof is rotatably fixed by said hinge pin, and said pipes are selectively closed by side planes thereof.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019960049002A KR100220407B1 (en) | 1996-10-28 | 1996-10-28 | Hot circulation pump having flow direction |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9720975D0 GB9720975D0 (en) | 1997-12-03 |
| GB2320061A true GB2320061A (en) | 1998-06-10 |
Family
ID=19479207
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9720975A Withdrawn GB2320061A (en) | 1996-10-28 | 1997-10-03 | A pump with two outlets |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPH10141287A (en) |
| KR (1) | KR100220407B1 (en) |
| CN (1) | CN1185558A (en) |
| DE (1) | DE19745737A1 (en) |
| GB (1) | GB2320061A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103953817A (en) * | 2014-04-03 | 2014-07-30 | 上海工程技术大学 | Self-regulation flow speed slowing device |
| US9689403B2 (en) | 2013-03-22 | 2017-06-27 | Johnson Electric S.A. | Pump having selectable outlets |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4313557B2 (en) * | 2002-09-26 | 2009-08-12 | 日本電産シバウラ株式会社 | pump |
| KR100968822B1 (en) | 2008-05-28 | 2010-07-08 | 현대자동차주식회사 | Apparatus For Injecting Detergent For A Window Glass |
| JP2010007563A (en) | 2008-06-26 | 2010-01-14 | Panasonic Electric Works Co Ltd | Pump |
| KR101297418B1 (en) * | 2011-10-11 | 2013-08-19 | 주식회사 성신 | Pump |
| CN103174679A (en) * | 2013-03-28 | 2013-06-26 | 苏州优德通力电气有限公司 | Water pump with automatic directional flow channel function |
| KR101626896B1 (en) * | 2015-07-28 | 2016-06-02 | 경남중천전화(주) | Pump for drainage and circulation |
| EP3156659B1 (en) * | 2015-10-12 | 2020-09-16 | Grundfos Holding A/S | Pump unit and hydraulic system |
| CZ308062B6 (en) * | 2016-05-24 | 2019-12-04 | Flexira S R O | Reverse fluid transfer system |
| EP3267042B1 (en) * | 2016-07-08 | 2020-01-15 | Grundfos Holding A/S | Pump unit |
| EP3376050A1 (en) | 2017-03-14 | 2018-09-19 | Grundfos Holding A/S | Centrifugal pump assembly |
| EP3376051B1 (en) * | 2017-03-14 | 2022-08-24 | Grundfos Holding A/S | Pump unit |
| CN109989924B (en) * | 2019-05-19 | 2020-07-14 | 南水北调江苏泵站技术有限公司 | Energy-saving centrifugal water pump |
| KR102296054B1 (en) * | 2019-11-12 | 2021-09-01 | 엘지전자 주식회사 | Folw path conversion pump |
| KR102550660B1 (en) * | 2020-12-15 | 2023-07-03 | 엘지전자 주식회사 | Laundry Treatment Apparatus |
| DE102022131010A1 (en) * | 2022-11-23 | 2024-05-23 | Miele & Cie. Kg | Pumping device, household appliance with pumping device and method for operating a pumping device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB817802A (en) * | 1954-11-12 | 1959-08-06 | Gen Electric | Improvements relating to centrifugal pumps, particularly suitable for clothes washing machines |
| GB2199080A (en) * | 1986-12-09 | 1988-06-29 | Trico Folberth Ltd | Valve arrangement for a bi-directional rotary pump |
| US5486089A (en) * | 1994-02-28 | 1996-01-23 | Daewoo Electronics Co., Ltd. | Directional changeover pump |
-
1996
- 1996-10-28 KR KR1019960049002A patent/KR100220407B1/en not_active IP Right Cessation
-
1997
- 1997-10-03 GB GB9720975A patent/GB2320061A/en not_active Withdrawn
- 1997-10-16 DE DE19745737A patent/DE19745737A1/en not_active Withdrawn
- 1997-10-16 CN CN97121362A patent/CN1185558A/en active Pending
- 1997-10-24 JP JP9292269A patent/JPH10141287A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB817802A (en) * | 1954-11-12 | 1959-08-06 | Gen Electric | Improvements relating to centrifugal pumps, particularly suitable for clothes washing machines |
| GB2199080A (en) * | 1986-12-09 | 1988-06-29 | Trico Folberth Ltd | Valve arrangement for a bi-directional rotary pump |
| US5486089A (en) * | 1994-02-28 | 1996-01-23 | Daewoo Electronics Co., Ltd. | Directional changeover pump |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9689403B2 (en) | 2013-03-22 | 2017-06-27 | Johnson Electric S.A. | Pump having selectable outlets |
| CN103953817A (en) * | 2014-04-03 | 2014-07-30 | 上海工程技术大学 | Self-regulation flow speed slowing device |
| CN103953817B (en) * | 2014-04-03 | 2016-04-27 | 上海工程技术大学 | A kind of self-regulation reduced velocity flow device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1185558A (en) | 1998-06-24 |
| DE19745737A1 (en) | 1998-05-07 |
| KR19980029682A (en) | 1998-07-25 |
| JPH10141287A (en) | 1998-05-26 |
| GB9720975D0 (en) | 1997-12-03 |
| KR100220407B1 (en) | 1999-09-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |