US20020009368A1 - Gear pump having a multishaft drive and method of operating same - Google Patents
Gear pump having a multishaft drive and method of operating same Download PDFInfo
- Publication number
- US20020009368A1 US20020009368A1 US09/963,558 US96355801A US2002009368A1 US 20020009368 A1 US20020009368 A1 US 20020009368A1 US 96355801 A US96355801 A US 96355801A US 2002009368 A1 US2002009368 A1 US 2002009368A1
- Authority
- US
- United States
- Prior art keywords
- gear pump
- units
- pump according
- control
- driving
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims description 12
- 238000005086 pumping Methods 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 2
- 230000005540 biological transmission Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 2
- 239000000945 filler Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
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
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
- F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
- F04C15/008—Prime movers
-
- 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
- F04C2240/40—Electric motor
- F04C2240/402—Plurality of electronically synchronised motors
Definitions
- the present invention relates to a gear pump having two mutually meshing gears which are each assigned to a shaft and which are each driven by means of a driving unit, the driving units each being drivable by a control unit such that the shafts rotate at a definable rotational velocity.
- gear pumps are driven by a single shaft which extends out of the pump casing.
- two-shaft arrangements are occasionally also used in order to protect the tooth surfaces from wear or excess strain.
- Known multishaft drives include timing gears which ensure that the tooth surfaces do not come in contact with one another.
- a single driving unit is used, the force distribution onto the individual shafts taking place by means of the engaging gears by way of the above-mentioned timing gear.
- German Patent Document DE-32 30 550 C2 in which a two-shaft drive is described which has two driving units.
- direct-current motors are used with a control unit which is based on current measurements in the exciting circuit of both driving units and on a rotational velocity measurement in the case of one driving unit.
- a desired rotational velocity and a desired power ratio can be defined.
- the last-mentioned driving concept has the disadvantage that, as the result of the rotational velocity monitoring taking place only on one side, in the event of a clutch, transmission or pump gearing damage, the line in which the rotational velocity is not monitored may cause consequent damage by endeavoring to reach the desired power. Furthermore, the power ratio can be adjusted only in a narrow range of from 0.5 to 1. Finally, this system is not suitable for appropriately detecting and taking into account torque pulsations because of the intervention point shifting on the intervention line, because of minimal gearing inaccuracies or differences in the rigidities of the engine mounting and transmission mounting.
- Preferred embodiments of the invention have the following advantages. In that a completely symmetrical structure for the control units for controlling the driving units is provided and, in addition, a fast data transmission is provided between the two control devices contained in the control units, it is achieved that, despite possible torque pulses on the shafts, the tooth surfaces will neither lift off, nor can an excess torque which is too high be transmitted by way of the tooth surfaces.
- the single drawing FIGURE is a schematic representation of a gear pump having two identical control units according to preferred embodiments of the invention.
- the drawing FIGURE schematically depicts a gear pump having a two-shaft drive and two control units SE 1 and SE 2 according to the invention.
- the gear pump has two mutually meshing gears Z 1 and Z 2 which are assigned to two different gear shafts W 1 and W 2 .
- the gears Z 1 and Z 2 and the shafts W 1 and W 2 are contained in a pump casing G.
- the shafts W 1 and W 2 extend to the outside and the projecting ends of the shafts W 1 and W 2 are each coupled with a driving unit AE 1 and AE 2 .
- control units SE 1 and SE 2 have a symmetrical construction and include one control device KE 1 and KE 2 respectively, one inverse rectifier WR 1 and WR 2 respectively as a power converter, and one rotational velocity measuring unit DME 1 and DME 2 respectively as measuring units which are each connected with a signal generator of the known type mounted on the shafts W 1 and W 2 .
- the signal measured in the signal generator is processed for the determination of the angular velocities ⁇ 1 and ⁇ 2, these then being transmitted to the control devices KE 1 and KE 2 .
- the respective control signals SS 1 and SS 2 are generated for controlling the respective inverse rectifiers WR 1 and WR 2 .
- output signals for the driving units AE 1 and AE 2 are also used which are generated by the inverse rectifier WR 1 and WR 2 , whereby possible nonlinearities or asymmetries of the inverse rectifiers WR 1 and WR 2 are automatically compensated.
- the driving units AE 1 and AE 2 are of the electric asynchronous machine type (Rolf Fischer, “Electric Machines”, 5th Edition, Carl Hanser Verlag, 1983, Pages 170 to 260).
- the output signals generated by the inverse rectifier WR 1 and WR 2 are indicated in the drawing figure by U 1 and U 2 for the electric voltage, and by I 1 and I 2 for the electric current and by F 1 and F 2 for the frequency.
- the output signals U 1 , I 1 , F 1 and U 2 , I 2 , F 2 are returned into the control device KE 1 and KE 2 for a precise adjustment.
- This provides a first internal control circuit for adjusting the rotational velocity of the shafts W 1 and W 2 .
- the driving units AE 1 and AE 2 are conceived as electromechanical converters, the voltage frequencies F 1 and F 2 are imaged on the angular velocities ⁇ 1 and ⁇ 1, and the voltages U 1 and U 2 and currents I 1 and I 2 are imaged on corresponding driving torques (vector drives) .
- Another control circuit is created by measuring the rotational shaft velocity by means of rotational velocity measuring units DME 1 and DME 2 and returning the measured signals into the respective control devices KE 1 and KE 2 .
- this second control circuit will be called an external control circuit.
- a fast data line DL preferably in the form of a data bus, is provided between the two control units SE 1 and SE 2 , by way of which the angular velocities ⁇ 1 and ⁇ 2 of the two shafts W 1 and W 2 and the position of the gears Z 1 and Z 2 can be precisely coordinated or adjusted with respect to one another.
- the data line DL is provided so that angular velocity differences can be reliably processed within the control units SE 1 and SE and that, despite possible torque pulses, neither a lifting-off of the tooth surfaces, which are to remain in contact, is caused, nor is an excess torque, which is too high, transmitted by way of the tooth surfaces.
- a computer unit is connected to the data line DL constructed as a data bus, by means of which computer unit a rotational velocity adjustment can, for example, take place, particularly in connection with other process components, with which the gear pump is connected.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
Abstract
Description
- The present invention relates to a gear pump having two mutually meshing gears which are each assigned to a shaft and which are each driven by means of a driving unit, the driving units each being drivable by a control unit such that the shafts rotate at a definable rotational velocity.
- Normally, gear pumps are driven by a single shaft which extends out of the pump casing. In cases with very high torques or when the flow medium is charged with fillers, two-shaft arrangements are occasionally also used in order to protect the tooth surfaces from wear or excess strain.
- Known multishaft drives include timing gears which ensure that the tooth surfaces do not come in contact with one another. In the case of the known multishaft drives, a single driving unit is used, the force distribution onto the individual shafts taking place by means of the engaging gears by way of the above-mentioned timing gear.
- Furthermore, a teaching is known from German Patent Document DE-32 30 550 C2 in which a two-shaft drive is described which has two driving units. In this case, direct-current motors are used with a control unit which is based on current measurements in the exciting circuit of both driving units and on a rotational velocity measurement in the case of one driving unit. In this known teaching, a desired rotational velocity and a desired power ratio can be defined.
- The last-mentioned driving concept has the disadvantage that, as the result of the rotational velocity monitoring taking place only on one side, in the event of a clutch, transmission or pump gearing damage, the line in which the rotational velocity is not monitored may cause consequent damage by endeavoring to reach the desired power. Furthermore, the power ratio can be adjusted only in a narrow range of from 0.5 to 1. Finally, this system is not suitable for appropriately detecting and taking into account torque pulsations because of the intervention point shifting on the intervention line, because of minimal gearing inaccuracies or differences in the rigidities of the engine mounting and transmission mounting.
- It is therefore an object of the present invention to provide a gear pump which does not have the above-mentioned disadvantages.
- This object is achieved by providing a gear pump of the above noted type, wherein the control units are operably connected by way of a data line. Further advantageous features of preferred embodiments of the present invention are described below and in the claims.
- Preferred embodiments of the invention have the following advantages. In that a completely symmetrical structure for the control units for controlling the driving units is provided and, in addition, a fast data transmission is provided between the two control devices contained in the control units, it is achieved that, despite possible torque pulses on the shafts, the tooth surfaces will neither lift off, nor can an excess torque which is too high be transmitted by way of the tooth surfaces.
- Other objects, advantages and novel features of the present invention will become apparent from the following detailed description of the invention when considered in conjunction with the accompanying drawings.
- The single drawing FIGURE is a schematic representation of a gear pump having two identical control units according to preferred embodiments of the invention.
- The drawing FIGURE schematically depicts a gear pump having a two-shaft drive and two control units SE1 and SE2 according to the invention. The gear pump has two mutually meshing gears Z1 and Z2 which are assigned to two different gear shafts W1 and W2. The gears Z1 and Z2 and the shafts W1 and W2 are contained in a pump casing G. The shafts W1 and W2 extend to the outside and the projecting ends of the shafts W1 and W2 are each coupled with a driving unit AE1 and AE2.
- According to the invention, the control units SE1 and SE2 have a symmetrical construction and include one control device KE1 and KE2 respectively, one inverse rectifier WR1 and WR2 respectively as a power converter, and one rotational velocity measuring unit DME1 and DME2 respectively as measuring units which are each connected with a signal generator of the known type mounted on the shafts W1 and W2. In the rotational velocity measuring units DME1 and DME2, the signal measured in the signal generator is processed for the determination of the angular velocities ω1 and ω2, these then being transmitted to the control devices KE1 and KE2.
- In the control devices KE1 and KE2, the respective control signals SS1 and SS2 are generated for controlling the respective inverse rectifiers WR1 and WR2. For this purpose, in addition to the angular velocity ω1 and ω2, output signals for the driving units AE1 and AE2 are also used which are generated by the inverse rectifier WR1 and WR2, whereby possible nonlinearities or asymmetries of the inverse rectifiers WR1 and WR2 are automatically compensated.
- In a preferred embodiment of the invention, the driving units AE1 and AE2 are of the electric asynchronous machine type (Rolf Fischer, “Electric Machines”, 5th Edition, Carl Hanser Verlag, 1983, Pages 170 to 260). The output signals generated by the inverse rectifier WR1 and WR2 are indicated in the drawing figure by U1 and U2 for the electric voltage, and by I1 and I2 for the electric current and by F1 and F2 for the frequency.
- As mentioned above, the output signals U1, I1, F1 and U2, I2, F2 are returned into the control device KE1 and KE2 for a precise adjustment. This provides a first internal control circuit for adjusting the rotational velocity of the shafts W1 and W2. Specifically, if the driving units AE1 and AE2 are conceived as electromechanical converters, the voltage frequencies F1 and F2 are imaged on the angular velocities ω1 and ω1, and the voltages U1 and U2 and currents I1 and I2 are imaged on corresponding driving torques (vector drives) . Another control circuit is created by measuring the rotational shaft velocity by means of rotational velocity measuring units DME1 and DME2 and returning the measured signals into the respective control devices KE1 and KE2. In the context of the present invention, this second control circuit will be called an external control circuit.
- According to the invention, a fast data line DL, preferably in the form of a data bus, is provided between the two control units SE1 and SE2, by way of which the angular velocities ω1 and ω2 of the two shafts W1 and W2 and the position of the gears Z1 and Z2 can be precisely coordinated or adjusted with respect to one another. The data line DL is provided so that angular velocity differences can be reliably processed within the control units SE1 and SE and that, despite possible torque pulses, neither a lifting-off of the tooth surfaces, which are to remain in contact, is caused, nor is an excess torque, which is too high, transmitted by way of the tooth surfaces.
- In another embodiment of the invention, it is provided that a computer unit is connected to the data line DL constructed as a data bus, by means of which computer unit a rotational velocity adjustment can, for example, take place, particularly in connection with other process components, with which the gear pump is connected.
- The foregoing disclosure has been set forth merely to illustrate the invention and is not intended to be limiting. Since modifications of the disclosed embodiments incorporating the spirit and substance of the invention may occur to persons skilled in the art, the invention should be construed to include everything within the scope of the appended claims and equivalents thereof.
Claims (25)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/963,558 US6447256B2 (en) | 1998-08-25 | 2001-09-27 | Gear pump having a multishaft drive and method of operating same |
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98115962.7 | 1998-08-25 | ||
EP98115962 | 1998-08-25 | ||
EP98115962A EP0886068B1 (en) | 1998-08-25 | 1998-08-25 | Gear pump with multiple driven shafts |
US09/382,830 US6312225B1 (en) | 1998-08-25 | 1999-08-25 | Gear pump having a multishaft drive and method of operating same |
US09/963,558 US6447256B2 (en) | 1998-08-25 | 2001-09-27 | Gear pump having a multishaft drive and method of operating same |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/382,830 Division US6312225B1 (en) | 1998-08-25 | 1999-08-25 | Gear pump having a multishaft drive and method of operating same |
Publications (2)
Publication Number | Publication Date |
---|---|
US20020009368A1 true US20020009368A1 (en) | 2002-01-24 |
US6447256B2 US6447256B2 (en) | 2002-09-10 |
Family
ID=8232504
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/382,830 Expired - Fee Related US6312225B1 (en) | 1998-08-25 | 1999-08-25 | Gear pump having a multishaft drive and method of operating same |
US09/963,558 Expired - Fee Related US6447256B2 (en) | 1998-08-25 | 2001-09-27 | Gear pump having a multishaft drive and method of operating same |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/382,830 Expired - Fee Related US6312225B1 (en) | 1998-08-25 | 1999-08-25 | Gear pump having a multishaft drive and method of operating same |
Country Status (3)
Country | Link |
---|---|
US (2) | US6312225B1 (en) |
EP (1) | EP0886068B1 (en) |
DE (1) | DE59809839D1 (en) |
Cited By (12)
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US20150282867A1 (en) * | 2014-04-02 | 2015-10-08 | Covidien Lp | Electrosurgical devices including transverse electrode configurations |
US9228586B2 (en) | 2014-02-28 | 2016-01-05 | Project Phoenix, LLC | Pump integrated with two independently driven prime movers |
US10072676B2 (en) | 2014-09-23 | 2018-09-11 | Project Phoenix, LLC | System to pump fluid and control thereof |
US10294936B2 (en) | 2014-04-22 | 2019-05-21 | Project Phoenix, Llc. | Fluid delivery system with a shaft having a through-passage |
US10465721B2 (en) | 2014-03-25 | 2019-11-05 | Project Phoenix, LLC | System to pump fluid and control thereof |
US10539134B2 (en) | 2014-10-06 | 2020-01-21 | Project Phoenix, LLC | Linear actuator assembly and system |
US10544810B2 (en) | 2014-06-02 | 2020-01-28 | Project Phoenix, LLC | Linear actuator assembly and system |
US10544861B2 (en) | 2014-06-02 | 2020-01-28 | Project Phoenix, LLC | Hydrostatic transmission assembly and system |
US10598176B2 (en) | 2014-07-22 | 2020-03-24 | Project Phoenix, LLC | External gear pump integrated with two independently driven prime movers |
US10677352B2 (en) | 2014-10-20 | 2020-06-09 | Project Phoenix, LLC | Hydrostatic transmission assembly and system |
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EP1249608A1 (en) | 2001-10-24 | 2002-10-16 | Maag Pump Systems Textron AG | Device, like an extrusion machine, comprising a direct driven gear pump |
US20050271538A1 (en) * | 2004-06-04 | 2005-12-08 | Entek Manufacturing, Inc. | Gear for use in a gear pump |
DE102004036505A1 (en) * | 2004-07-28 | 2006-03-16 | Daimlerchrysler Ag | powertrain |
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EP2275683B1 (en) | 2009-06-18 | 2017-01-11 | Maag Pump Systems AG | Method for controlling a gear pump |
US20100322806A1 (en) * | 2009-06-18 | 2010-12-23 | Aregger Markus | Arrangement including a gear pump |
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Family Cites Families (6)
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US3780365A (en) * | 1968-05-31 | 1973-12-18 | Upjohn Co | Digital method and system for material handling |
CH659290A5 (en) * | 1982-07-08 | 1987-01-15 | Maag Zahnraeder & Maschinen Ag | GEAR PUMP. |
DE3928451A1 (en) * | 1989-08-29 | 1991-03-07 | Guenther Schmidt | Intelligent control and regulation system for complex drives - has electric motors, measurement devices, power electronics, drive units with logical interconnection via standard interfaces |
DE69123898T3 (en) * | 1990-08-01 | 2004-08-05 | Matsushita Electric Industrial Co., Ltd., Kadoma | Rotary system for liquid media |
JP3049793B2 (en) * | 1991-03-04 | 2000-06-05 | 松下電器産業株式会社 | Fluid rotating device |
DE4318707A1 (en) * | 1993-06-04 | 1994-12-08 | Sihi Gmbh & Co Kg | Displacement machine with electronic motor synchronization |
-
1998
- 1998-08-25 DE DE59809839T patent/DE59809839D1/en not_active Expired - Fee Related
- 1998-08-25 EP EP98115962A patent/EP0886068B1/en not_active Expired - Lifetime
-
1999
- 1999-08-25 US US09/382,830 patent/US6312225B1/en not_active Expired - Fee Related
-
2001
- 2001-09-27 US US09/963,558 patent/US6447256B2/en not_active Expired - Fee Related
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US9228586B2 (en) | 2014-02-28 | 2016-01-05 | Project Phoenix, LLC | Pump integrated with two independently driven prime movers |
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US10539134B2 (en) | 2014-10-06 | 2020-01-21 | Project Phoenix, LLC | Linear actuator assembly and system |
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US10677352B2 (en) | 2014-10-20 | 2020-06-09 | Project Phoenix, LLC | Hydrostatic transmission assembly and system |
US11085440B2 (en) | 2015-09-02 | 2021-08-10 | Project Phoenix, LLC | System to pump fluid and control thereof |
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US11846283B2 (en) | 2015-09-02 | 2023-12-19 | Project Phoenix, LLC | System to pump fluid and control thereof |
Also Published As
Publication number | Publication date |
---|---|
US6312225B1 (en) | 2001-11-06 |
EP0886068B1 (en) | 2003-10-08 |
EP0886068A3 (en) | 1999-03-17 |
DE59809839D1 (en) | 2003-11-13 |
EP0886068A2 (en) | 1998-12-23 |
US6447256B2 (en) | 2002-09-10 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
FPAY | Fee payment |
Year of fee payment: 4 |
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AS | Assignment |
Owner name: MAAG PUMP SYSTEMS TEXTRON AG, SWITZERLAND Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:MAAG TEXTRON HOLDING AG;REEL/FRAME:022086/0500 Effective date: 20080902 Owner name: MAAG TEXTRON HOLDING AG, SWITZERLAND Free format text: CHANGE OF NAME;ASSIGNOR:MAAG PUMP SYSTEMS TEXTRON AG;REEL/FRAME:022086/0463 Effective date: 20030626 |
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Year of fee payment: 8 |
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LAPS | Lapse for failure to pay maintenance fees | ||
STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
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FP | Lapsed due to failure to pay maintenance fee |
Effective date: 20140910 |