KR20170090849A - Gerotor pump with separated dual rotor - Google Patents

Gerotor pump with separated dual rotor Download PDF

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Publication number
KR20170090849A
KR20170090849A KR1020160011741A KR20160011741A KR20170090849A KR 20170090849 A KR20170090849 A KR 20170090849A KR 1020160011741 A KR1020160011741 A KR 1020160011741A KR 20160011741 A KR20160011741 A KR 20160011741A KR 20170090849 A KR20170090849 A KR 20170090849A
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South Korea
Prior art keywords
rotor
modules
pump
module
fluid
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KR1020160011741A
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Korean (ko)
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KR101825961B1 (en
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이재천
하오 리우
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계명대학교 산학협력단
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    • 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
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C1/00—Rotary-piston machines or engines
    • F01C1/02—Rotary-piston machines or engines of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
    • F01C1/04—Rotary-piston machines or engines of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents of internal-axis type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/02—Pressure lubrication using lubricating pumps

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)

Abstract

According to the present invention, a separate dual rotor-type gerotor pump includes a plurality of rotor modules provided inside a pump casing, and configured to pump a fluid while saw-toothed wheels of an outer rotor and an inner rotor are engaged with each other and rotate. The plurality of rotor modules is arranged side by side in the line of one axis, and a separation plate for separating a pumping area of each rotor module is provided the rotor modules, thus having an effect of improving the performance of a pump by enabling stable pumping in the pumping area of each rotor module.

Description

[0001] The present invention relates to an isolated dual rotor geared rotor pump,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground-rotor pump used as an oil pump or the like of an automobile engine.

The lubrication apparatus of an automobile engine is an indispensable device for smoothly operating the engine and maintaining a long life. The oil pump, which is one of the components of such a lubrication apparatus, is mainly used for an internal gear pump which is advantageous in terms of flow rate, durability, noise and miniaturization.

Such an oil pump is an essential functional part of an engine that is mounted on an engine of an automobile and converts mechanical energy supplied from the engine to pressure energy and speed energy of the engine oil so that lubricating oil To prevent abnormal wear, disconnection, and the like of the components.

Components constituting the oil pump include an electric motor, a key, an outer rotor and an inner rotor, a rotor case, an O-ring, a screw screw and so on. In addition to other standard products in the oil pump, the rotor case is manufactured by die casting according to the specification of the oil pump, and the outer rotor and the inner rotor are produced by powder forging.

On the other hand, the gerotor oil pump and the motor with arbitrarily generated rotor are composed of the inner rotor and the outer rotor, so that the structure is simple and the shape is complicated due to the improvement of the manufacturing precision of the sintered product It is easy to process, easy to assemble, less relative motion between two tooth types, less change in efficiency even when used for a long time, and excellent suction performance. In addition, it is widely used as a pump for suction and resistance of a tandem pump coupled with a piston pump. Especially, it has a lower noise than other pumps and is widely used as a supply source of lubricant for engine lubrication and as a hydraulic source of an automatic transmission . The advantage is that the discharge volume per one revolution is larger than the vane or gear pump in comparison with the total volume. For this reason, it is widely used in hydraulic systems, and application technology is rapidly expanding with the recent development of processing technology.

Therefore, a number of techniques have been performed in connection with the rotor tooth design of a geared rotor oil pump / motor. Colbourne ("Gear Shape and Theoretical Flow Rate in Internal Gear Pumps," Trans. Of the CSME, Vol.3, No. 4 pp. 215-223, 1975) simulates the contact between the inner rotor and the outer rotor, And the area in the chamber closed by the tooth curve of the inner rotor and the outer rotor was calculated. Sae-gusa ("Development of Oil-Pump Rotor with a Trochoidal Tooth Shape," Tran.SAE, 840454. pp. 359-364, 1984) fixes the inner rotor and rotates the outer rotor, And the tooth profile of the inner rotor is derived from the interlocking characteristics of the inner rotor and the outer rotor to obtain the tooth profile of the inner rotor. In addition, Beard ("Hypotrochoidal versus Epitrochoidal Gerotor Type Pumps with Special Attention to Volume Change Ratio and Size," ASME Proceedings, Design Automation Conference, Boston, Mass., Sep. 1987) and the like disclose hypotrochoidal and epitrochoidal ) And showed a mathematical relationship. Tsay ("Gerotor Pumps-Design Simulation And Contact Analysis," pp. 349-356, 1992) has presented a method of simulating the cutting process to determine the internal rotor tooth profile. In addition, Lee et al. ("Journal of KSTLE, Vol. 11, No. 2, pp 63-70, 1995) and others have used the family of curves to derive the formula for the internal rotor tooth, Flow rate and torque calculation.

However, the contents published so far are focused on theoretical interpretation, and there are no examples that can easily be utilized by computerizing them. In addition, the technology of designing the most important rotor shape in the oil pump design technology is required, and there is a need for a new technology of high performance, high efficiency, low noise and low vibration. Particularly, the geometric, geometric, computational fluid dynamics (CFD) and system summing approaches of the tooth profile were required by analyzing factors related to the performance, vibration and efficiency of the oil pump.

As a conventional technique for solving such a problem, a geothermal oil pump of Patent Publication No. 10-2011-0113541 (registered on Oct. 17, 2011) is disclosed. The geothermal oil pump of this patent is characterized in that a circular curve is inserted between a hypocycloid curve and an epicycloid curve to constitute an inner rotor, and the outer rotor is constituted by creating the locus of the outer rotor in the inner rotor have.

However, the geothermal oil pump of the above-mentioned patent publication has improved flow rate, abrasion resistance, and noise in comparison with the conventional geothermal oil pump. However, due to the circular trajectory between the hypocycloid and the epicycloid of the inner rotor, There was a limit to reducing

In addition, automobile fuel economy improvement is possible by improving energy loss rate of various parts. In particular, the energy loss rate of the oil pump, which is a component of the engine lubrication system, accounts for about 10 to 30% of the total engine. One way to reduce this large energy loss rate in an oil pump is to reduce the thickness of the rotor, but this leads to a reduction in the driving force and a reduction in the flow rate. Therefore, it is required to develop a rotor with high flow rate and low pulsation characteristics that satisfy the required flow rate of the system and reduce wear and drive noise even if the rotor thickness is reduced.

The contents of the background art described above are technical information that the inventor of the present application holds for the derivation of the present invention or acquired in the derivation process of the present invention and is a known technology disclosed to the general public prior to the filing of the present invention I can not.

Korean Patent No. 10-1382540 Korean Patent No. 10-0733520

SUMMARY OF THE INVENTION The present invention has been conceived to solve the problems described above. Unlike a conventional single-module geared rotor pump including an inner rotor and an outer rotor, the two rotor modules are divided into a separation plate, So that the channel capacity of the fluid can be maintained or widened to continuously and smoothly induce a change in the fluid pressure to reduce the flow pulsation, thereby providing an isolated dual rotor geared rotor pump.

In order to accomplish the above object, the present invention provides an isolated dual rotor ground rotor pump, comprising: a plurality of rotor modules in a pump casing for pumping fluid while rotating gears of an outer rotor and an inner rotor, The plurality of rotor modules are arranged on a single axial line, and a separation plate for dividing a pumping region of each rotor module is provided between the rotor modules.

Preferably, the separator is assembled together with the drive shaft for driving the inner rotor and configured to rotate together with the rotor module.

Preferably, the separation plate is formed in a disk-shaped structure, and a shaft hole is formed at a central portion to which the drive shaft is coupled.

It is preferable that the separating plate is formed such that the outer peripheral surface thereof is the same size as the outer peripheral surface of the outer rotor of each of the rotor modules.

It is preferable that the plurality of rotor modules have the same shape of the toothed wheels in which the inner rotor and the outer rotor mesh with each other.

The plurality of rotor modules are preferably configured to have the same thickness on both sides of the separating plate.

The plurality of rotor modules are preferably arranged such that each of the toothed wheels has a predetermined angle of phase difference in the rotation direction of the rotor so that the suction and discharge of the fluid are performed with a predetermined time difference.

Since the plurality of rotor modules are divided into the separation plates and the gears of the respective rotor modules are configured to have a predetermined angle phase difference, the isolation type dual rotor ground rotor pump according to the present invention can continuously and smoothly change the flow rate and the fluid pressure. The pulsation characteristic is reduced, and the flow rate can be sufficiently secured by changing the pumping space between the first rotor module and the second rotor module, thereby providing an effect of high flow rate and low pulsation characteristics.

In addition, since both rotor modules are partitioned into separate plates, it is possible to perform a stable pumping action in the pumping region of each rotor module, thereby contributing to an improvement in the performance of the pump.

1 is a perspective view of an isolated dual rotor ground rotor pump according to an embodiment of the present invention.
2 is an exploded perspective view of an isolated dual rotor ground rotor pump according to an embodiment of the present invention.
3 is a right side view of an isolated dual rotor geared rotor pump according to an embodiment of the present invention.
4 is a left side view of an isolated dual rotor ground rotor pump according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and how to accomplish it, will be described with reference to the embodiments described in detail below with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. The embodiments are provided so that those skilled in the art can easily carry out the technical idea of the present invention to those skilled in the art.

In the drawings, embodiments of the present invention are not limited to the specific forms shown and are exaggerated for clarity. Also, the same reference numerals denote the same components throughout the specification.

The expression "and / or" is used herein to mean including at least one of the elements listed before and after. Also, singular forms include plural forms unless the context clearly dictates otherwise. Also, components, steps, operations and elements referred to in the specification as " comprises "or" comprising " refer to the presence or addition of one or more other components, steps, operations, elements, and / or devices.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

FIGS. 1 and 2 are a perspective view and an exploded perspective view showing an isolated dual rotor ground rotor pump according to an embodiment of the present invention, and FIGS. 3 and 4 illustrate an isolated dual rotor ground rotor pump illustrated in FIG. Right side view and left side view.

The isolated dual rotor ground rotor pump according to the embodiment of the present invention is configured such that two rotor modules 10 and 20 are provided in a pump casing (not shown).

Here, the pump casing includes a rotor for rotatably supporting the two rotor modules 10 and 20, and a flow path for oil to be pumped and discharged by the two rotor modules 10 and 20 . Such a pump casing can be designed and modified by using a known pump casing as long as a person skilled in the art is familiar with the present invention, so that the pump casing is omitted in the accompanying drawings.

Referring to FIGS. 1 and 2, the two rotor modules are composed of a first rotor module 10 and a second rotor module 20.

The first rotor module 10 comprises a first outer rotor 11 and a first inner rotor 15 which rotates in engagement with the toothed wheels 11a of the first outer rotor 11.

The second rotor module 20 is composed of a second outer rotor 21 and a second inner rotor 25 which rotates in engagement with the gear 21a of the second outer rotor 21.

Of course, the first inner rotor 15 and the second inner rotor 25 are also formed with gear wheels 15a and 25a on their peripheral surfaces, respectively.

The first rotor module 10 and the second rotor module 20 are arranged side by side on one axial line and are configured to be driven by one driving shaft (not shown). The drive shaft is coupled to each of the inner rotors 15 and 25 so as to be able to transmit the rotational force of the motor (not shown) to the respective inner rotors 15 and 25.

Particularly, between the rotor modules 10 and 20, a separation plate 30 for dividing a pumping region of each rotor module is provided. At this time, it is preferable that the separator 30 is assembled together with the drive shaft for driving the two inner rotors 15 and 25, and is configured to rotate together with the two rotor modules 10 and 20 as a whole.

It is also preferable that the separation plate 30 is formed in a disk-like structure and a shaft hole 30c to which the drive shaft is coupled is formed at the center.

The separating plate 30 is preferably formed such that the outer circumferential surface thereof is the same size as the outer circumferential surface of the outer rotors 11 and 21 of the respective rotor modules.

The first rotor module 10 and the second rotor module 20 may be formed in the same manner as gears interlocked with each other.

3 and 4, the first rotor module 10 and the second rotor module 20 are arranged such that the respective toothed wheels rotate in the direction of rotation of the rotor so that the suction and discharge of the fluid take place at a predetermined time difference, So as to have a phase difference of a certain angle?.

On the other hand, the ground rotor pump is a representative volumetric pump whose flow rate is proportional to the rotation speed of the motor. It is composed of an inner rotor and an outer rotor which are connected by the drive shaft of the motor and transmit torque, So as to move the fluid. It is relatively simple in structure and has many advantages such as high reliability, durability, high strength, and good property, and is widely applied to lubrication systems of engines, compressors, tools, tractors and the like. Recently, the precision of machining has been improved due to the development of sintering product manufacturing technology, and miniaturization in a high-speed environment has become possible.

The operation principle of the geothermal pump is designed so that the inner rotor applying the trochoid curve and the outer rotor having the annular gear shape are centered on each other. The inner rotor and the outer rotor are bound together in any case, and during rotation they form several closed pumping chambers to transport the fluid. Each inner rotor rotates along its own axis. At the suction part, the pumping chamber becomes larger along the rotation direction, and at the discharge side, it becomes smaller again and the flow is balanced at a uniform flow rate.

Such a rotor pump also exhibits pulsation characteristics due to the difference between suction pressure and discharge pressure, which is referred to as flow pulsation. In other words, the flow pulsation is a phenomenon in which the pressure fluctuates periodically as the pulse is jerked when the fluid is pressure-fed.

In addition, the source of noise generated by the hydraulic device is a hydraulic pump and a motor. The generated noise is an air-borne noise propagated into the air, a solid propagation noise propagating to a structure connected to a hydraulic pump and a motor structure-to-noise noise, and fluid-borne noise propagated through a fluid in a channel. Particularly, in the total noise generated in the hydraulic system, the specific gravity of the fluid noise is large, which is known to be caused by the flow rate / pressure pulsation propagating from the pump through the channel.

Therefore, the flow pulsation phenomenon causes the noise of the pump. Various methods have been studied as a method for reducing the noise, and studies for reducing the flow pulsation, which is a cause thereof, are increasing.

And improvement of automobile fuel efficiency is possible by improving energy loss rate of various parts. In particular, the energy loss rate of the oil pump, which is a component of the engine lubrication system, accounts for about 10-30% of the total engine. One way to reduce this large energy loss rate in an oil pump is to reduce the thickness of the rotor, but this leads to a reduction in the driving force and a reduction in the flow rate. Therefore, it is required to develop a rotor with high flow rate and low pulsation characteristics that satisfy the required flow rate of the system and reduce wear and drive noise even if the rotor thickness is reduced.

Therefore, in the embodiment of the present invention, the independent rotor modules 10 and 20 are rotated at a constant angle (in order to induce a change in the flow rate and the change in the pressure, which are caused by the engagement of the internal and external cog wheels, and the separation plates 30 are interposed therebetween, so that the suction and discharge of the fluid have a constant time difference so that the flow rate and the pressure change of the fluid are continuous The pulsation characteristics can be reduced by smoothly guiding the pulsation characteristics of the first rotor module 10 and the second rotor module 20 and a sufficient flow rate can be ensured by varying the pumping spaces of the first rotor module 10 and the second rotor module 20, Provides a ground rotor pump.

1, the ground rotor pump according to the embodiment of the present invention includes a first rotor module (hereinafter, referred to as " first rotor module " 10 and the second rotor module 20 are disposed.

Each of the rotor modules 10 and 20 includes the outer rotor 11 and the inner rotor 15 and the inner rotor 15 and the inner rotor 15 ) 25 is formed on the outer circumferential surface thereof so as to be meshed with each other.

Key holes 15c, 25c and 30c are formed in the inner rotor 15 and the separator 30 of each of the rotor modules 10 and 20 and the key holes 15c and 25c, And one drive shaft is connected to the drive shaft 30c so as to rotate at the same time.

The gears of the first rotor module 10 and the second rotor module 20 may be formed in the same manner and the gears 11a and 15a of the first rotor module 10 and the gears of the second rotor module 20 The gears 21a and 25a of the rotor 20 may be shifted from each other as shown in FIG. 3 and FIG. 4, that is, to have a phase difference of a certain angle in the rotation direction of the rotor.

In this embodiment of the present invention, the first rotor module 10 allows the gears of the first inner rotor 15 and the first outer rotor 11 to rotate along the trochoid curve, and the second rotor module 20 The first rotor module 10 and the second rotor module 20 on both sides of the separation plate 30 are rotatably supported by the first rotor module 15 and the second rotor module 20, The first inner rotor 15 and the second inner rotor 25 and the separation plate 30 are connected to each other by a single drive shaft so that the fluid is rotated at a predetermined time interval And pumping is performed.

The number of teeth of the internal rotors 15 and 25 of the first and second rotor modules 10 and 20 may be less than the number of teeth of the external rotors 11 and 21 . The structure of the rotor pump allows the fluid to flow in and out between the inner rotor and the outer rotor, and the inner rotor can move along the trochoid curve while engaging with the gear wheel of the outer rotor, . The number of cogwheels may vary according to the optimum design process, but generally the number of cogwheels of the outer rotor forms more than one number of cogwheels of the inner rotor.

The number of teeth of the first rotor module 10 and the second rotor module 20 may be the same or the number of teeth of the first rotor module 10 and the second rotor module 20 may be equal to each other. It can be something else.

As described above, when the gears of the first rotor module 10 and the second rotor module 20 are the same, the inner rotor and the outer rotor are rotated through one drive shaft to rotate the rotor modules 10 For example, the cogs of the second rotor module 20, rather than the cogs of the first rotor module 10, can be pumped by moving along the trochoidal curve of the second rotor module 20, 2, and the same position point is rotated at different speeds along the respective trochoidal curves, so that it operates normally without affecting the operation of the rotor module rotating on the same axis. That is, in order to utilize the advantage of being easy to manufacture, the same number of gears of the first rotor module 10 and the second rotor module 20 are applied, and the designing and manufacturing process is somewhat difficult. However, In order to utilize the advantage of amplifying the reduction effect of pulsation, it is also possible to apply different numbers of teeth of the first rotor module 10 and the second rotor module 20 to each other.

The first rotor module 10 and the second rotor module 20 may have the same lateral thickness. It is possible to combine the first rotor module 10 and the second rotor module 20 with different lateral thicknesses. However, in order to reduce the stiffness of the rotor pump and the flow pulsation due to rotation, It is desirable to enhance the stiffness balance and the structural stability. When the pumping spaces are different from each other due to their different thicknesses, the balance is broken and a new type of flow pulsation can be formed.

As described above, in the present invention, the two rotor modules 10 and 20 divided by the separator plate 30 are staggered so that the channel capacity of the fluid is different from that of the conventional single-module rotor pump composed of the internal rotor and the external rotor, The present invention provides a new concept of an isolated dual rotor geared rotor pump capable of continuously and smoothly inducing changes in fluid pressure while maintaining or widening the flow rate and reducing flow pulsation.

While the invention has been shown and described with respect to the specific embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. Anyone with it will know easily.

10: first rotor module, 11: first outer rotor, 15: second inner rotor,
20: second rotor module, 21: second outer rotor, 25: second inner rotor
30: separator plate

Claims (9)

A plurality of rotor modules are provided in the pump casing so as to pump the fluid while the gears of the outer rotor and the inner rotor intermesh and rotate,
And a separation plate separating a pumping region of each rotor module is provided between the plurality of rotor modules. The method according to claim 1,
Wherein the plurality of rotor modules and the separation plates are arranged side by side on one axial line. The method of claim 2,
Wherein the separation plate is assembled together with a drive shaft for driving the inner rotor and configured to rotate together with the rotor module. The method of claim 3,
Wherein the separation plate is formed in a disk-shaped structure, and a shaft hole to which the drive shaft is coupled is formed at a central portion thereof. The method of claim 2,
Wherein the separating plate has an outer circumferential surface formed to have the same size as an outer circumferential surface of an outer rotor of each of the rotor modules. The method according to claim 1,
Wherein the plurality of rotor modules are configured such that the inner rotor and the outer rotor engage with each other to have the same shape. The method according to claim 1,
Wherein the plurality of rotor modules are configured to have the same thickness on both sides of the separating plate. A plurality of rotor modules are provided in the pump casing so as to pump the fluid while the gears of the outer rotor and the inner rotor intermesh and rotate,
The plurality of rotor modules are arranged in parallel on one axial line, and the gears of the outer rotor and the inner rotor are mutually engaged with each other.
And a separation plate for dividing a pumping region of each rotor module is provided between the plurality of rotor modules, and the separation plate is assembled together with a drive shaft for driving an inner rotor of each of the rotor modules, and rotated together with the rotor module Isolated dual rotor geared rotor pump. The method according to any one of claims 1 to 8,
Wherein each of the plurality of rotor modules is disposed such that each of the plurality of toothed wheels has a predetermined angle of phase difference in the rotation direction of the rotor so that the fluid is sucked and discharged with a predetermined time difference.
KR1020160011741A 2016-01-29 2016-01-29 Gerotor pump with separated dual rotor KR101825961B1 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107327688A (en) * 2017-08-17 2017-11-07 湖南机油泵股份有限公司 A kind of dual-rotor structure lubricating oil pump
CN108223015A (en) * 2018-03-12 2018-06-29 陈武 Staggeredly circulation type fluid dynamic gear and the fluid machine of composition
KR101982437B1 (en) * 2018-02-07 2019-05-27 조성엽 A hollowness pump
US11867179B2 (en) 2018-07-03 2024-01-09 Korea Atomic Energy Research Institute Fluid transfer apparatus with a plurality of rotor housings arranged at different angularity with the neighboring rotor housings

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007064140A (en) * 2005-09-01 2007-03-15 Sumitomo Denko Shoketsu Gokin Kk Internal gear pump
RS51355B (en) 2008-04-01 2011-02-28 Zivoslav Milovanovic Device with rotary pistons which can be used as a compressor, a pump, a vacuum pump, turbine, engine as well as other driving and driven hydraulic and pneumatic machines
JP5973719B2 (en) 2011-12-22 2016-08-23 株式会社山田製作所 Internal gear pump

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107327688A (en) * 2017-08-17 2017-11-07 湖南机油泵股份有限公司 A kind of dual-rotor structure lubricating oil pump
CN107327688B (en) * 2017-08-17 2022-12-06 湖南机油泵股份有限公司 Oil pump with double-rotor structure
KR101982437B1 (en) * 2018-02-07 2019-05-27 조성엽 A hollowness pump
CN108223015A (en) * 2018-03-12 2018-06-29 陈武 Staggeredly circulation type fluid dynamic gear and the fluid machine of composition
CN108223015B (en) * 2018-03-12 2023-08-15 陈武 Staggered circulation type hydrodynamic gear and fluid machine comprising same
US11867179B2 (en) 2018-07-03 2024-01-09 Korea Atomic Energy Research Institute Fluid transfer apparatus with a plurality of rotor housings arranged at different angularity with the neighboring rotor housings

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