KR101724651B1 - Twin circle positive-displacement pump - Google Patents
Twin circle positive-displacement pump Download PDFInfo
- Publication number
- KR101724651B1 KR101724651B1 KR1020160170649A KR20160170649A KR101724651B1 KR 101724651 B1 KR101724651 B1 KR 101724651B1 KR 1020160170649 A KR1020160170649 A KR 1020160170649A KR 20160170649 A KR20160170649 A KR 20160170649A KR 101724651 B1 KR101724651 B1 KR 101724651B1
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- KR
- South Korea
- Prior art keywords
- eccentric rotor
- cylindrical member
- rotary shaft
- rotor
- flexible bearing
- Prior art date
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
- F04C23/001—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids of similar working principle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/0042—Driving elements, brakes, couplings, transmissions specially adapted for pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/10—Stators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/20—Rotors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/50—Bearings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/60—Shafts
Abstract
Description
The present invention relates to a volume pump, and more particularly, to a two-dimensional volumetric pump capable of minimizing a center-to-center distance deviation between upper and lower rotors rotating inward in the opposite direction to each other to ensure smooth driving.
The pump is a mechanical device that transports fluid of a liquid or a gas through a pipe by a pressure action, or pushes a fluid in a low-pressure container through a pipe to a high-pressure container.
Pumps can be classified as reciprocating pumps, rotary (rotary) pumps, centrifugal pumps, axial pumps, friction pumps, etc. when structurally classified.
Among these pumps, the rotary pump is configured such that the piston acting on the piston acts on the piston while the piston acts on the piston by the rotor (rotor), and can be used for various purposes, and is widely used as a hydraulic pump for automatic control .
There are various rotary pumps according to their structures. Among them,
In Patent Document 2, an upper volume chamber and a lower volume chamber are formed in a pumping block having an intake port and a discharge port, an upper rotor is disposed in the upper volume chamber, a lower rotor is disposed in the lower volume chamber, The upper end of the diaphragm is brought into close contact with the upper rotor, the lower end of the diaphragm is in close contact with the lower rotor, the upper shaft is eccentrically mounted to the upper rotor and the lower shaft is eccentrically mounted to the lower rotor, And the upper and lower support members press the upper and lower support members, which are fitted to the upper and lower ends of the vertical hole, so that the upper head and the lower head are fixed to the mounting groove formed at the upper and lower ends of the body, And the lower head portion are respectively fitted and fitted.
Patent Document 3 discloses a case; A first gear portion accommodated in the case and rotating together with a first head portion for pressing fluid or sludge; A third gear portion that is positioned below the first gear portion and rotates together with a second head portion that is directly or indirectly engaged with the first gear portion and pressurizes fluid or sludge; A pumping unit operatively associated with the third gear unit for pumping oil; And a transfer part connected to the pumping part and extending in the direction of the first gear part to supply oil to the first gear part.
The problems of the conventional tandem rotary pump will be described with reference to FIGS. 1, 2 and 3. FIG. Fig. 1 shows a perspective view of a general rotary pump. Fig. 2 shows an operating state of the upper and lower cylindrical members according to one rotation of the upper and lower eccentric rotors in the rotary pump shown in Fig. 1. Fig. Sectional view showing a change in the center distance of the upper and lower eccentric rotors according to the operating state of the upper and lower eccentric rotors.
1, the rotary pump includes a
At this time, the upper rotor and the lower rotor are symmetrical with respect to each other and have the same structure.
The upper rotor includes an upper
However, the upper cylindrical member constituting the upper rotor and the lower cylindrical member constituting the lower rotor are connected to each other by the
At this time, the upper and lower volume chambers have a circular shape, and the outer and inner circumferential surfaces of the upper and lower cylindrical members are also circular. The outer peripheral surface of the upper and lower eccentric rotors is also circular.
Meanwhile, the upper and lower eccentric rotors are inserted and fixed to rotary shafts (14a, 14b) for transmitting rotational power from the guide portions. That is, the rotary shaft is inserted eccentrically to one side rather than the center of the upper and lower eccentric rotors, and is coupled to each other using a shaft coupling element such as a key.
In the case of such a structure, intermediate
Fig. 2 (a) is a sectional view showing a state in which the rotating shaft is aligned in line with the diaphragm in an initial state, Fig. 2 (b) is a sectional view showing the state in which the upper rotating shaft rotates 90 degrees clockwise, FIG. 2 (c) is a cross-sectional view showing a state in which the upper rotary shaft rotates 180 degrees in the clockwise direction and the lower rotary shaft rotates 180 degrees in the counterclockwise direction, FIG. 2 (d) 270 degrees in the clockwise direction, and 270 degrees in the counterclockwise direction in the lower rotation axis.
As described above, when the center of each eccentric rotor is located on the extension line connecting the upper and lower rotation shafts as shown in Figs. 2 (a) and 2 (c) The distances between the centers of the upper and lower eccentric rotors are different when the centers of the eccentric rotors are not located on the extension line connecting the upper and lower rotary shafts as shown in Figs. 2 (b) and 2 (d). For reference, it can be seen that the distance between the centers of the eccentric rotors is the longest in the case of Figs. 2 (b) and 2 (d).
3, the rotation of the two
That is, since the upper outer circumferential surface of the eccentric rotor presses the upper inner circumferential surface of the cylindrical member, an impact is generated, and at the same time, the eccentric rotor is caught by the inner circumferential surface of the cylindrical member.
SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to minimize the deviation in the distance between the centers of the upper and lower eccentric rotors, And to provide a two-dimensional volumetric pump capable of achieving this.
That is, in the process of operation of the upper eccentric rotor and the lower eccentric rotor, the error of the center distance between the two eccentric rotors is reduced to smoothly operate, thereby maintaining a constant output and improving the durability of the components And a pump for supplying the pump.
According to an aspect of the present invention, there is provided a dual-use volumetric pump comprising: a housing having an upper volumetric chamber and a lower volumetric chamber which are symmetric with each other and communicate with each other; A rotary shaft including an upper rotary shaft and a lower rotary shaft which rotate in opposite directions in the upper and lower volume chambers respectively; An eccentric rotor including an upper eccentric rotor and a lower eccentric rotor in which the upper rotary shaft and the lower rotary shaft are eccentrically inserted and rotated, respectively; An upper cylindrical member and a lower cylindrical member accommodating therein the upper eccentric rotor and the lower eccentric rotor, respectively, and inserting and moving in the upper and lower volume chambers, respectively, and a lower cylindrical member and a lower cylindrical member, A cylindrical member including a diaphragm for interlocking with each other; And a flexible bearing provided between the upper cylindrical member and the upper eccentric rotor and between the lower cylindrical member and the lower eccentric rotor to reduce friction and impact on the cylindrical member due to rotation of the eccentric rotor, Wherein at least one of the upper eccentric rotor and the lower eccentric rotor has an elliptical shape in which a rotary shaft is positioned on a major axis, and the flexible bearing is also formed in an outer peripheral surface of the eccentric rotor outer peripheral surface And an empty space is formed between the flexible bearing and the inner circumferential surface of the cylindrical member.
Here, the radius of curvature of the side surface in the state where the elliptical eccentric rotor is vertically erected may be the same as the radius of curvature of the inner circumferential surface of the cylindrical member.
The rolling bearing of the flexible bearing may be any one of a ball, a roller, a hollow pin, and a hollow cutting pin. The retainer for maintaining the interval between the inner ring and the outer ring and the rolling means supporting the inside and outside of the rolling means, (Flexible) material.
The inner ring and the outer ring may be cylindrically shaped or may have a shape in which the strap is wound in a spiral shape.
The rolling means of the flexible bearing may be formed of a cylindrical and flexible resin material.
According to another embodiment of the present invention, there is provided a vacuum cleaner comprising: a housing having an upper volume chamber and a lower volume chamber which are vertically symmetrical and communicated with each other; A rotary shaft including an upper rotary shaft and a lower rotary shaft which rotate in opposite directions in the upper and lower volume chambers respectively; An eccentric rotor including an upper eccentric rotor and a lower eccentric rotor in which the upper rotary shaft and the lower rotary shaft are eccentrically inserted and rotated, respectively; An upper cylindrical member and a lower cylindrical member accommodating therein the upper eccentric rotor and the lower eccentric rotor, respectively, and inserting and moving in the upper and lower volume chambers, respectively, and a lower cylindrical member and a lower cylindrical member, A cylindrical member including a diaphragm for interlocking with each other; And a flexible bearing provided between the upper cylindrical member and the upper eccentric rotor and between the lower cylindrical member and the lower eccentric rotor to reduce friction and impact on the cylindrical member due to rotation of the eccentric rotor, Wherein the end face of at least one of the upper cylindrical member and the lower cylindrical member is elliptic, the end face of the eccentric rotor accommodated in the elliptic cylindrical member is elliptic with a rotary shaft positioned on the longer axis, And an elliptical shape contacting the outer circumferential surface, so that a clearance space can be formed between the flexible bearing and the inner circumferential surface of the cylindrical member.
In this case, the radius of curvature of the side surface of the elliptical eccentric rotor may be equal to the radius of curvature of the cylindrical member on which the clearance is formed when the eccentric rotor is rotated 90 degrees.
The rolling bearing of the flexible bearing may be any one of a ball, a roller, a hollow pin, and a hollow cutting pin. The retainer for maintaining the interval between the inner ring and the outer ring and the rolling means supporting the inside and outside of the rolling means, (Flexible) material.
The inner ring and the outer ring may be cylindrically shaped or may have a shape in which the strap is wound in a spiral shape.
The rolling means of the flexible bearing may be formed of a cylindrical and flexible resin material.
According to the present invention constructed as described above, the eccentric rotor and the flexible bearing are formed in an elliptic shape, thereby forming a clearance space between the flexible bearing and the inner circumferential surface of the cylindrical member, thereby changing the distance between the centers of the two eccentric rotors So that the output of the pump can be prevented from being lowered.
In other words, since the eccentric rotor can be smoothly operated without being caught by the cylindrical member by reducing the center distance error of the two eccentric rotors, the present invention has an advantage that the durability of the components can be improved as well as the output of the pump .
1 is a perspective view of a general rotary pump;
Fig. 2 is an operational view of upper and lower cylindrical members according to one rotation of the upper and lower eccentric rotors in the rotary pump shown in Fig. 1. Fig.
3 is a sectional view showing a change in the center distance of the upper and lower eccentric rotors according to the operating state of the conventional rotary pump.
4 is an overall cross-sectional view of a dual-volume volumetric pump in accordance with one embodiment of the present invention.
Figure 5 is an enlarged cross-sectional view of an enlarged view of the upper components of the present invention shown in Figure 4;
6 is a sectional view showing a flexible bearing according to the present invention;
7 is a cross-sectional view and side view showing the type of rolling means of the flexible bearing shown in Fig. 6;
8 is a cross-sectional view and a side view showing the inner ring and the outer ring type of the flexible bearing shown in Fig. 6;
9 is a sectional view showing another embodiment of the flexible bearing of the present invention.
10 is a sectional view showing an operating state of the present invention.
11 is an enlarged cross-sectional view of a dual-use volumetric pump according to another embodiment of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a pump according to the present invention will be described in detail with reference to the accompanying drawings.
For a better understanding of the present invention, the description with reference to the drawings is not intended to limit the scope of the present invention. In the following description, a detailed description of related arts will be omitted when it is determined that the gist of the present invention may be unnecessarily blurred.
FIG. 4 shows an overall cross-sectional view of a dual-use volumetric pump according to the present invention, and FIG. 5 shows an enlarged cross-sectional view of an enlarged view of the upper components of the present invention shown in FIG.
Referring to FIG. 1, an embodiment of the present invention includes a
First, the
The upper and
Fluid inlet (i) and outlet (o) are formed on both sides of the housing (100).
Next, the
At this time, the
The
The
When the
It should be noted that at least one cross-sectional shape of the two
In this case, the elliptical shape refers to a shape in which one side diameter (major axis) is longer than the other side diameter (minor axis), not a true circle. In the present invention, the
Next, the
The
At this time, the upper
The upper
Next, the flexible bearing will be described with reference to FIG. 6 is a cross-sectional view showing a flexible bearing according to the present invention. 6 (a) shows the shape of the flexible bearing when there is no external force, and Fig. 6 (b) shows the shape of the flexible bearing deformed into the ellipse when there is external force.
And FIG. 7 is a cross-sectional view and a side view showing the type of rolling means of the flexible bearing shown in FIG. 6, and FIG. 8 is a cross-sectional view and a side view showing the kind of the inner ring and the outer ring of the flexible bearing shown in FIG.
A
The
6, the
The
The types of the rolling means 540, the
A ball, a roller, a hollow pin, and a hollow cutting pin may be used as the rolling means 540 interposed between the inner and outer rings, as shown in FIG. 7 (a) is a view, (b) is a roller, (c) is a hollow pin, and (d) is a hollow cutting pin.
The ball has a spherical shape, and the roller has a round bar shape and may be made of a steel material.
The hollow pin may have a shape of an empty hollow, and the hollow cutting pin may have a shape cut at one side of the hollow pin and may be made of steel.
Particularly, the hollow cutting pin can be deformed and restored by an external force due to the cut portion, thereby being flexible.
The
When the
In addition, the
Meanwhile, the balls, rollers, hollow pins, and hollow cut-out pins are usually installed in less than the number of flexible bearings used in mechanical devices, so that a sufficient distance is maintained between balls, rollers, hollow pins, It is desirable to allow the eccentric rotors to be easily deformed into an elliptical shape when rotating.
9, another form of the flexible bearing can be used. 9 is a cross-sectional view showing another embodiment of the flexible bearing of the present invention.
The rolling means 540 may be formed as an integral cylindrical shape without a retainer. At this time, the rolling means 540 may be made of a flexible resin material.
A solid lubricant-dispersible resin using a tetrafluoroethylene (PTFE) resin can be preferably used. This can be used in air, underwater, and sea water. Even if the oil is attached to the bearing sliding surface, the friction characteristics are not deteriorated, and lubricant film is formed even under a small exercise condition, thereby exhibiting excellent friction characteristics. It has the load-bearing characteristics of metal bracket class due to the double structure of sliding layer and back material (FRP), and it is easy to set the dimensions because the swelling rate is low.
However, it is needless to say that the present invention is not limited to the above-described embodiment, and other types and types of resin bearings can be used.
The space S can be formed between the elliptical
The operating state of the present invention will be described in detail with reference to FIG. 2 and FIG. 9 is a cross-sectional view showing an operating state of the present invention.
The center distance deviation of the
However, since the
Therefore, as in the past, there is no occurrence of a shock or a phenomenon during rotation, so that smooth rotation is possible.
In addition, since the
A
That is, the radius of curvature of both side surfaces and the radius of curvature of the inner circumferential surface of the
This allows the side of the upper
Hereinafter, another embodiment of the present invention will be described with reference to FIG. Figure 10 shows an enlarged cross-sectional view of a dual-use volumetric pump according to another embodiment of the present invention.
Referring to the drawings, another embodiment of the present invention may include a
The description of the housing, the rotating shaft, the eccentric rotor, and the flexible bearing is largely different from that described above, so that a detailed description thereof will be omitted and the
The cross section of at least one of the upper
In such a structure, a clearance space S is formed between the
Preferably, in the initial state where the elliptical
That is, the upper
This allows the side of the upper
While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.
100: Housing
100a:
i: Fluid inlet o: Fluid outlet
200:
200a: upper
300: eccentric rotor
300a: upper
400:
400b: lower
500: Flexible bearing
510: inner ring 520: outer ring
530: retainer 540: rolling means
S: Free space
Claims (10)
A rotary shaft including an upper rotary shaft and a lower rotary shaft which rotate in opposite directions in the upper and lower volume chambers respectively;
An eccentric rotor including an upper eccentric rotor and a lower eccentric rotor in which the upper rotary shaft and the lower rotary shaft are eccentrically inserted and rotated, respectively;
An upper cylindrical member and a lower cylindrical member accommodating therein the upper eccentric rotor and the lower eccentric rotor, respectively, and inserting and moving in the upper and lower volume chambers, respectively, and a lower cylindrical member and a lower cylindrical member, A cylindrical member including a diaphragm for interlocking with each other; And
A retainer for retaining the inner and outer rings of the rolling means and the outer ring and the rolling means is provided between the upper cylindrical member and the upper eccentric rotor and between the lower cylindrical member and the lower eccentric rotor, And a flexible bearing which is made of one material and reduces the friction and impact on the cylindrical member due to rotation of the eccentric rotor,
Wherein at least one of the upper eccentric rotor and the lower eccentric rotor has an elliptical shape in which a rotary shaft is positioned on a major axis, and the flexible bearing is also formed in an outer peripheral surface of the eccentric rotor outer peripheral surface Wherein an empty space is formed between the flexible bearing and the inner circumferential surface of the cylindrical member.
Wherein the rolling means of the flexible bearing is one of a ball, a roller, a hollow pin, and a hollow cutting pin.
Wherein the inner ring and the outer ring have a cylindrical shape or a shape in which the strap is wound in a spiral shape.
Wherein the rolling means of the flexible bearing is made of a cylindrical and flexible resin material.
The radius of curvature of the side surface of the elliptic eccentric rotor in a vertically standing state,
And the radius of curvature of the inner peripheral surface of the cylindrical member is equal to the radius of curvature of the inner peripheral surface of the cylindrical member.
A rotary shaft including an upper rotary shaft and a lower rotary shaft which rotate in opposite directions in the upper and lower volume chambers respectively;
An eccentric rotor including an upper eccentric rotor and a lower eccentric rotor in which the upper rotary shaft and the lower rotary shaft are eccentrically inserted and rotated, respectively;
An upper cylindrical member and a lower cylindrical member accommodating therein the upper eccentric rotor and the lower eccentric rotor, respectively, and inserting and moving in the upper and lower volume chambers, respectively, and a lower cylindrical member and a lower cylindrical member, A cylindrical member including a diaphragm for interlocking with each other; And
A retainer for retaining the inner and outer rings of the rolling means and the outer ring and the rolling means is provided between the upper cylindrical member and the upper eccentric rotor and between the lower cylindrical member and the lower eccentric rotor, And a flexible bearing which is made of one material and reduces the friction and impact on the cylindrical member due to rotation of the eccentric rotor,
Wherein the end face of at least one of the upper cylindrical member and the lower cylindrical member is elliptic, the end face of the eccentric rotor accommodated in the elliptic cylindrical member is elliptic with a rotary shaft positioned on the longer axis, And an elliptic shape abutting the outer circumferential surface, wherein a clearance is formed between the inner circumferential surface of the flexible bearing and the cylindrical member.
Wherein the rolling means of the flexible bearing is one of a ball, a roller, a hollow pin, and a hollow cutting pin.
Wherein the inner ring and the outer ring have a cylindrical shape or a shape in which the strap is wound in a spiral shape.
Wherein the rolling means of the flexible bearing is made of a cylindrical and flexible resin material.
The radius of curvature of the side surface of the elliptic eccentric rotor in a vertically standing state,
And a radius of curvature on the side of the cylindrical member on which the clearance space is formed when the eccentric rotor is rotated by 90 degrees.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020160170649A KR101724651B1 (en) | 2016-12-14 | 2016-12-14 | Twin circle positive-displacement pump |
PCT/KR2017/013854 WO2018110869A1 (en) | 2016-12-14 | 2017-11-29 | Bicircular positive displacement pump |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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KR1020160170649A KR101724651B1 (en) | 2016-12-14 | 2016-12-14 | Twin circle positive-displacement pump |
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KR101724651B1 true KR101724651B1 (en) | 2017-04-07 |
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KR1020160170649A KR101724651B1 (en) | 2016-12-14 | 2016-12-14 | Twin circle positive-displacement pump |
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Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998021478A1 (en) * | 1996-11-11 | 1998-05-22 | Phil Chan Rha | Twin-cylinder impeller pump |
KR200330991Y1 (en) * | 2003-07-24 | 2003-10-22 | 주식회사 포스코 | Shell type guide roll of mini mill segment, using flexible bearing |
KR100801247B1 (en) | 2007-05-23 | 2008-02-11 | 이기춘 | Tandem rotary pump |
KR100876547B1 (en) | 2007-07-04 | 2008-12-31 | 박종국 | Twin rotary pump |
KR101621067B1 (en) | 2015-12-11 | 2016-05-13 | 경도파워텍 주식회사 | Oil Circulation Apparatus and Twin Rotary Pump Using Thereof |
-
2016
- 2016-12-14 KR KR1020160170649A patent/KR101724651B1/en active IP Right Grant
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998021478A1 (en) * | 1996-11-11 | 1998-05-22 | Phil Chan Rha | Twin-cylinder impeller pump |
CN1210577A (en) * | 1996-11-11 | 1999-03-10 | 罗弼灿 | Twin-cylinder impeller pump |
KR200330991Y1 (en) * | 2003-07-24 | 2003-10-22 | 주식회사 포스코 | Shell type guide roll of mini mill segment, using flexible bearing |
KR100801247B1 (en) | 2007-05-23 | 2008-02-11 | 이기춘 | Tandem rotary pump |
KR100876547B1 (en) | 2007-07-04 | 2008-12-31 | 박종국 | Twin rotary pump |
KR101621067B1 (en) | 2015-12-11 | 2016-05-13 | 경도파워텍 주식회사 | Oil Circulation Apparatus and Twin Rotary Pump Using Thereof |
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