CN110778482A - Hollow shaft orifice plate centrifugal pump for enhancing oil suction of displacement pump - Google Patents

Hollow shaft orifice plate centrifugal pump for enhancing oil suction of displacement pump Download PDF

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Publication number
CN110778482A
CN110778482A CN201911134353.XA CN201911134353A CN110778482A CN 110778482 A CN110778482 A CN 110778482A CN 201911134353 A CN201911134353 A CN 201911134353A CN 110778482 A CN110778482 A CN 110778482A
Authority
CN
China
Prior art keywords
pump
centrifugal pump
oil
orifice
centrifugal
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.)
Pending
Application number
CN201911134353.XA
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Chinese (zh)
Inventor
冀宏
孙飞
赵晶
赵宏科
郑直
闵为
张贺
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Lanzhou University of Technology
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Lanzhou University of Technology
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Filing date
Publication date
Application filed by Lanzhou University of Technology filed Critical Lanzhou University of Technology
Priority to CN201911134353.XA priority Critical patent/CN110778482A/en
Publication of CN110778482A publication Critical patent/CN110778482A/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B23/00Pumping installations or systems
    • F04B23/04Combinations of two or more pumps
    • F04B23/08Combinations of two or more pumps the pumps being of different types
    • F04B23/14Combinations of two or more pumps the pumps being of different types at least one pump being of the non-positive-displacement type
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00Pumping installations or systems
    • F04D13/02Units comprising pumps and their driving means
    • F04D13/06Units comprising pumps and their driving means the pump being electrically driven
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/40Casings; Connections of working fluid
    • F04D29/42Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/426Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/40Casings; Connections of working fluid
    • F04D29/42Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44Fluid-guiding means, e.g. diffusers
    • F04D29/445Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/58Cooling; Heating; Diminishing heat transfer
    • F04D29/5806Cooling the drive system
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/58Cooling; Heating; Diminishing heat transfer
    • F04D29/586Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/60Mounting; Assembling; Disassembling
    • F04D29/62Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
    • F04D29/628Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for liquid pumps

Abstract

A hollow shaft orifice plate centrifugal pump for enhancing oil absorption of a displacement pump comprises an oil absorption cavity (7 a), a centrifugal tube (7 b), an oil discharge cavity (7 c), a flat key (7 d) and an internal spline (7 e), wherein one side of the oil absorption cavity (7 a) of the orifice plate centrifugal pump (7) is structurally a slender hollow shaft used for being connected with a motor rotor (4), the internal spline (7 e) capable of being configured with the displacement pump is arranged on one side of the oil discharge cavity (7 c), the orifice plate centrifugal pump (7) and the motor rotor (4) are in small interference fit, and are respectively provided with a key (7 d) and a key groove (4 a) which are matched with each other, two ends of the orifice plate centrifugal pump (7) are respectively supported by a first bearing (1) and a second bearing (6), and the motor stator (3) is respectively fixed on the rear end cover (2) and the front end cover (5), generates electromagnetic torque after being electrified to drive the motor rotor (4) to work, and simultaneously drives the orifice plate centrifugal pump (7) to work.

Description

Hollow shaft orifice plate centrifugal pump for enhancing oil suction of displacement pump
Technical Field
The invention relates to the technology of centrifugal pumps, in particular to a hollow shaft orifice plate centrifugal pump capable of enhancing the oil suction of a displacement pump and arranged at the front end of an oil suction port of a hydraulic pump.
Background
The energy loss in the displacement pump is mainly considered to be internal leakage and mechanical friction, in addition, the oil absorption of the displacement pump is insufficient in nature, the oil absorption efficiency values of various displacement pumps are clearly indicated in documents JB/T7041-2006, JB/T7039-2006 and JB/T7043-2006, the energy loss of the displacement pump is up to 14% -32%, the vacuum degree of an oil pumping port of the displacement pump is generally required to be not less than 16KPa, however, the higher the rotating speed is, the greater the vacuum degree is, the more unfavorable the oil absorption is, and therefore the development of the displacement pump to the high rotating speed is greatly limited.
To improving the volume and pumping oily efficiency problem, each researcher pumps hydraulic fluid port structure, pipeline structure and oil tank structure etc. through optimizing the volume to improve the volume and pump oily problem of pumping, however the effect is not obvious, also has the turbine centrifugal pump setting among the hydraulic machinery and pumps hydraulic fluid port front end at the volume, supplementary volume pump oil absorption, but, this kind of centrifugal pump structure is complicated, and needs extra motor drive, has increased energy loss undoubtedly again.
Disclosure of Invention
The invention aims to provide a hollow shaft orifice plate centrifugal pump for enhancing oil suction of a volume pump.
The invention relates to a hollow shaft orifice plate centrifugal pump for enhancing oil absorption of a displacement pump, which comprises an oil absorption cavity 7a, a centrifugal tube 7b, an oil discharge cavity 7c, a flat key 7d and an internal spline 7e, wherein one side of the oil absorption cavity 7a of the orifice plate centrifugal pump 7 is a slender hollow shaft used for being connected with a motor rotor 4, the internal spline 7e capable of being configured with the displacement pump is arranged on one side of the oil discharge cavity 7c, the orifice plate centrifugal pump 7 and the motor rotor 4 are in small interference fit and are respectively provided with a key 7d and a key groove 4a for being matched with each other, two ends of the orifice plate centrifugal pump 7 are respectively supported by a first bearing 1 and a second bearing 6 and are respectively fixed on a rear end cover 2 and a front end cover 5, an electromagnetic torque generated after a motor stator 3 is electrified so as to.
The invention has the advantages that:
(1) the invention has the characteristics of simple structure, good manufacturability and high efficiency;
(2) the oil absorption assisting device is arranged at the front end of an oil absorption opening of the displacement pump to assist the displacement pump to absorb oil, so that the oil absorption performance of the displacement pump is enhanced, the working rotating speed of the displacement pump is improved, and the application field of the displacement pump is expanded;
(3) the heat dissipation device can also be used as a heat dissipation flow channel in the working process, and takes away heat generated by the motor by virtue of flowing oil liquid, so as to play a role in heat dissipation and cooling;
(4) the orifice plate centrifugal pump and the motor rotor are in small interference fit and are connected by a key, so that the centrifugal pump is more stable and reliable, the assembly and replacement time of parts can be shortened, if the centrifugal pump and the motor rotor are only matched by larger interference, on one hand, the heating temperature of the motor rotor is too high, the intrinsic performance of the rotor is possibly damaged, and on the other hand, the centrifugal pump and the motor rotor can be only destructively disassembled after being assembled, so that the resource waste is caused;
(5) the oil inlet cavity of the orifice plate centrifugal pump is of a slope type, the oil discharge cavity is of a radian type, and the oil inlet cavity and the oil discharge cavity both play a role in flow guiding.
Drawings
Fig. 1 is a structural principle diagram of the present invention, fig. 2 is a sectional view of a motor rotor 4, fig. 3 is a front view of a centrifugal pump 7 with an orifice plate, fig. 4 is a left view of fig. 3, and reference numerals and corresponding names are as follows: the centrifugal pump comprises a first bearing 1, a rear end cover 2, a motor stator 3, a motor rotor 4, a key groove 4a, a front end cover 5, a second bearing 6, a pore plate centrifugal pump 7, an oil suction cavity 7a, a centrifugal tube 7b, an oil discharge cavity 7c, a flat key 7d and an internal spline 7 e. Fig. 5 is an efficiency curve of the orifice centrifugal pump itself, and fig. 6 is a variation curve of outlet pressure of the orifice centrifugal pump with rotation speed.
Detailed Description
As shown in fig. 1 to 4, the invention relates to a hollow shaft orifice plate centrifugal pump for enhancing oil absorption of a displacement pump, which comprises an oil absorption cavity 7a, a centrifugal tube 7b, an oil discharge cavity 7c, a flat key 7d and an internal spline 7e, wherein one side of the oil absorption cavity 7a of the orifice plate centrifugal pump 7 is a slender hollow shaft used for being connected with a motor rotor 4, the internal spline 7e capable of being configured with the displacement pump is arranged on one side of the oil discharge cavity 7c, the orifice plate centrifugal pump 7 and the motor rotor 4 are in small interference fit and are respectively provided with a key 7d and a key groove 4a for being matched with each other, two ends of the orifice plate centrifugal pump 7 are respectively supported by a first bearing 1 and a second bearing 6 and are respectively fixed on a rear end cover 2 and a front end cover 5, and an electromagnetic torque generated after a motor stator 3 is electrified drives.
As shown in fig. 1 to 4, the centrifugal tube 7b of the centrifugal pump 7 has a first inclination angle α inclined with respect to the horizontal axis and a second inclination angle β inclined with respect to the vertical axis, and the flat keys 7 are two hollow shafts symmetrically distributed on one side of the oil suction chamber 7a of the centrifugal pump 7.
As shown in fig. 1 to 4, the centrifugal tubes 7b are uniformly distributed on the orifice plate centrifugal pump 7, the number of the centrifugal tubes is determined by the first diameter D and the second diameter D of the orifice plate centrifugal pump, the value range of the first inclination angle α is 0 to 45 °, the value range of the first inclination angle α ensures that the flow of the centrifugal tube 7D is directly injected into the oil pumping port of the volumetric pump, and the value range of the second inclination angle β is 0 to 80 °.
As shown in fig. 1 and 3, an internal spline 7e for connecting with a displacement pump shaft is arranged on one side of an oil discharge cavity 7c of the orifice plate centrifugal pump 7, and an oil suction port of a hydraulic pump is opposite to the oil discharge cavity 7 c.
As shown in fig. 1 and 3, the oil inlet chamber 7a of the orifice plate centrifugal pump 7 is of a slope type, and the oil discharge chamber 7c is of a radian type.
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1 to 4, the invention relates to a hollow shaft orifice plate centrifugal pump for enhancing oil absorption of a displacement pump, which comprises an oil absorption cavity 7a, a centrifugal tube 7b, an oil discharge cavity 7c, a flat key 7d and an internal spline 7e, and is characterized in that one side of the oil absorption cavity 7a of the orifice plate centrifugal pump 7 is a slender hollow shaft and is used for being connected with a motor rotor 4, the internal spline 7e is arranged on one side of the oil discharge cavity 7c and can be configured with displacement pumps of different types, the orifice plate centrifugal pump 7 and the motor rotor 4 are in small interference fit and are respectively provided with a key 7d and a key groove 4a for mutual fit, two ends of the orifice plate centrifugal pump 7 are supported by a first bearing 1 and a second bearing 6 and are respectively fixed on a rear end cover 2 and a front end cover 5, and an electromagnetic torque is generated after a motor stator.
As shown in fig. 1, 3 and 4, the internal spline 7e arranged on one side of the oil discharge cavity 7c of the orifice centrifugal pump 7 is used for connecting with the displacement pump shaft, and the oil suction port of the hydraulic pump is opposite to the oil discharge cavity 7c, wherein the displacement pump is not limited in type.
As shown in fig. 1, 3 and 4, the oil inlet cavity 7a of the centrifugal pump 7 is of a slope type, the oil discharge cavity 7c is of a radian type, both of which have flow guiding functions, and the centrifugal pump can be used as a heat dissipation flow channel in the working process, so that the heat generated by the motor is taken out by flowing hydraulic oil, and has a heat dissipation function.
As shown in fig. 5, which is an efficiency curve of the centrifugal pump with the perforated plate, when the α angle is 45 degrees and the β angle is 30-70 degrees, the efficiency of the centrifugal pump with the perforated plate reaches over 90 percent and reaches as high as 98.5 percent, which indicates that the centrifugal pump with the perforated plate has high efficiency.
As shown in fig. 6, which is a curve of the outlet pressure of the orifice centrifugal pump along with the change of the rotating speed, it can be found that the outlet pressure continuously rises along with the increase of the rotating speed, which indicates that the higher the rotating speed is, the stronger the auxiliary oil absorption capacity of the orifice centrifugal pump is, and the insufficient oil absorption condition of the displacement pump can be greatly improved under the working conditions of medium and high rotating speeds.
The working process of the invention is as follows: the 3 circular telegram back of motor stator produces electromagnetic torque, and driving motor rotor 4 rotates, and orifice plate centrifugal pump 7 is followed and is rotary motion simultaneously, and hydraulic oil is got rid of to oil extraction chamber 7c under the effect of centrifugal force in, and then enters into the volume and sucks the hydraulic fluid port, and this in-process can take away the heat that the motor produced, plays the radiating action.

Claims (5)

1. A hollow shaft pore plate centrifugal pump for enhancing oil absorption of a displacement pump comprises an oil absorption cavity (7 a), a centrifugal tube (7 b), an oil discharge cavity (7 c), a flat key (7 d) and an internal spline (7 e), and is characterized in that one side of the oil absorption cavity (7 a) of the pore plate centrifugal pump (7) is a slender hollow shaft used for being connected with a motor rotor (4), the internal spline (7 e) capable of being configured with the displacement pump is arranged on one side of the oil discharge cavity (7 c), the pore plate centrifugal pump (7) and the motor rotor (4) are in small interference fit and are respectively provided with a key (7 d) and a key groove (4 a) for mutual fit, two ends of the pore plate centrifugal pump (7) are respectively supported by a first bearing (1) and a second bearing (6) and are respectively fixed on a rear end cover (2) and a front end cover (5), a motor stator (3) generates electromagnetic torque to drive the motor rotor (4) to, and simultaneously drives the orifice plate centrifugal pump (7) to work.
2. The hollow shaft orifice centrifugal pump for enhancing the oil suction of the volumetric pump as recited in claim 1, characterized in that the centrifugal tube (7 b) of the orifice centrifugal pump (7) is inclined at a first inclination angle (α) with respect to the horizontal axis and at a second inclination angle (β) with respect to the vertical axis, and the flat keys (7) are two hollow shafts symmetrically distributed on the side of the oil suction chamber (7 a) of the orifice centrifugal pump (7).
3. The hollow shaft orifice centrifugal pump for enhancing the oil suction of the volumetric pump as recited in claim 1, characterized in that the centrifugal tubes (7 b) are uniformly distributed on the orifice centrifugal pump (7), the number of the centrifugal tubes is determined by a first diameter (D) and a second diameter (D) of the orifice centrifugal pump, the range of the first inclination angle (α) is 0-45 °, the range of the first inclination angle (α) ensures that the outlet flow of the centrifugal tube (7D) directly enters the oil suction port of the volumetric pump, and the range of the second inclination angle (β) is 0-80 °.
4. The hollow shaft orifice pump for enhanced positive displacement pump suction as claimed in claim 1 wherein: one side of an oil discharge cavity (7 c) of the pore plate centrifugal pump (7) is provided with an internal spline (7 e) connected with a volume pump shaft, and an oil suction port of the hydraulic pump is opposite to the oil discharge cavity (7 c).
5. The hollow shaft orifice pump for enhanced positive displacement pump suction as claimed in claim 1 wherein: the oil inlet cavity (7 a) of the orifice plate centrifugal pump (7) is of a slope type, and the oil discharge cavity (7 c) is of a radian type.
CN201911134353.XA 2019-11-19 2019-11-19 Hollow shaft orifice plate centrifugal pump for enhancing oil suction of displacement pump Pending CN110778482A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911134353.XA CN110778482A (en) 2019-11-19 2019-11-19 Hollow shaft orifice plate centrifugal pump for enhancing oil suction of displacement pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911134353.XA CN110778482A (en) 2019-11-19 2019-11-19 Hollow shaft orifice plate centrifugal pump for enhancing oil suction of displacement pump

Publications (1)

Publication Number Publication Date
CN110778482A true CN110778482A (en) 2020-02-11

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07332223A (en) * 1994-06-08 1995-12-22 Daikin Ind Ltd Fluid pressure generating device
CN101255868A (en) * 2007-12-10 2008-09-03 兰州理工大学 Embedded vane pump of motor
CN103047134A (en) * 2013-01-24 2013-04-17 兰州理工大学 Non-oil-immersed air gap type hydraulic motor vane pump
CN203903743U (en) * 2014-05-13 2014-10-29 浙江西子富沃德电机有限公司 Cantilever type permanent magnet synchronous tractor
CN204290540U (en) * 2015-01-09 2015-04-22 深圳市大地和电气股份有限公司 A kind of rotor structure for permanent magnet motor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07332223A (en) * 1994-06-08 1995-12-22 Daikin Ind Ltd Fluid pressure generating device
CN101255868A (en) * 2007-12-10 2008-09-03 兰州理工大学 Embedded vane pump of motor
CN103047134A (en) * 2013-01-24 2013-04-17 兰州理工大学 Non-oil-immersed air gap type hydraulic motor vane pump
CN203903743U (en) * 2014-05-13 2014-10-29 浙江西子富沃德电机有限公司 Cantilever type permanent magnet synchronous tractor
CN204290540U (en) * 2015-01-09 2015-04-22 深圳市大地和电气股份有限公司 A kind of rotor structure for permanent magnet motor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
冀宏等: "液压电机泵内置孔板离心泵的流场解析与优化", 《机械工程学报》 *

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