EP1477676A1 - Pompe de dosage - Google Patents

Pompe de dosage Download PDF

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Publication number
EP1477676A1
EP1477676A1 EP03010890A EP03010890A EP1477676A1 EP 1477676 A1 EP1477676 A1 EP 1477676A1 EP 03010890 A EP03010890 A EP 03010890A EP 03010890 A EP03010890 A EP 03010890A EP 1477676 A1 EP1477676 A1 EP 1477676A1
Authority
EP
European Patent Office
Prior art keywords
drive
motor
drive motor
dosing pump
crankcase
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
Application number
EP03010890A
Other languages
German (de)
English (en)
Other versions
EP1477676B1 (fr
Inventor
Brian Mouridsen
Hans Henrik Jochumsen
Janus Juul Rasmussen
Niels Frederiksen
Steen KÄHLER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Grundfos AS
Original Assignee
Grundfos AS
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Grundfos AS filed Critical Grundfos AS
Priority to EP03010890A priority Critical patent/EP1477676B1/fr
Priority to DE50301675T priority patent/DE50301675D1/de
Publication of EP1477676A1 publication Critical patent/EP1477676A1/fr
Application granted granted Critical
Publication of EP1477676B1 publication Critical patent/EP1477676B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
    • F04B43/04—Pumps having electric drive

Definitions

  • the invention relates to a metering pump.
  • a generic metering pump is known from DE 112 887 C1. These Dosing pump has an externally attached to a transmission housing Membrane pump on. Inside the gearbox is an eccentric gear arranged, which determines the rotational movement of a drive motor converts into a linear movement of a connecting rod, which the Membrane of the diaphragm pump moved back and forth.
  • the eccentric gear is arranged inside a support profile to which a drive motor is flanged.
  • the drive motor drives via a toothed belt the eccentric wheel.
  • a disadvantage of this belt drive are large radial bearing forces and large dimensions of the gearbox. Furthermore, the achievable gear ratio is limited, so that no high-speed motors can be used.
  • the metering pump according to the invention has a drive unit and a from this via a piston rod driven diaphragm pump on.
  • the drive unit has a drive motor, preferably a Electric motor, and powered by this piston drive.
  • the piston drive sets the rotary motion of the drive motor in one Linear movement of the piston rod around.
  • the piston engine generates an oscillating linear movement of the piston rod, which is a Membrane of the diaphragm pump corresponding oscillating back and forth emotional.
  • According to the invention is between the drive motor and the piston engine arranged a planetary gear. This arrangement allows on the well-known in the prior art belt drive to renounce.
  • the planetary gear allows the use of smaller Bearings, as the bearing forces occurring due to reduced radial forces are lower than in the known timing belt assembly. Of the Use of smaller bearings and the overall compact design of the planetary gear allows to make the entire drive unit smaller. In addition, a planetary gear allows a larger Gear ratio, so that even high-speed drive motors can be used.
  • the piston drive has an eccentric, which the Rotary movement of the drive motor and the planetary gear in one Linear movement of the piston rod converts, whereby the piston rod extends normal to the axis of rotation of the drive motor and the drive motor and the eccentric are arranged coaxially with each other.
  • the Coaxial arrangement of eccentric and drive motor allows one overall more compact and especially in the direction of the piston rod shorter design of the drive unit and thus the entire dosing pump. Furthermore, this arrangement causes a reduction in the number the required bearings, in addition to the bearing forces be reduced.
  • the drive motor is a brushless DC motor.
  • a brushless DC motor is particular by the inventive arrangement of the planetary gear favors, as a brushless DC motor higher Speed than those previously used in known metering pumps Asynchronous motors.
  • the planetary gear according to the invention allows such a large gear ratio that even the high Speeds of a brushless DC motor to those for the drive reduces the required speed of the eccentric diaphragm pump can be.
  • the brushless DC motor allows one higher efficiency of the dosing pump.
  • a brushless indicates DC motor with the same output power smaller dimensions on than the engines used so far and thus allows one overall smaller construction of the drive unit. Furthermore generates such a DC motor, a lower waste heat, so that the cooling of the drive unit is simplified.
  • a Spring element arranged such that its spring force of movement the piston rod counteracts their return stroke.
  • the piston rod moves the piston rod toward the diaphragm and pushes the membrane into the pump chamber in a pump head the diaphragm pump. This reduces the volume of the pump chamber, and the fluid contained in the pump chamber is through an outlet opening pressed out of the pump head.
  • the piston rod moves away from the membrane and pulls the membrane back or leaves it due to its inherent elasticity spring back. This increases the volume of the pump chamber again, and it is sucked new fluid through an inlet opening.
  • the required for the return stroke and acting on the piston rod Traction is less than that in the working stroke of the piston rod pressure applied to the membrane.
  • These are periodically changing Forces acting on the piston rod lead to a periodically fluctuating torque load of the eccentric drive and thus the drive motor.
  • This is especially brushless DC motors disadvantageous.
  • This negative effect is caused by the Arrangement of the spring element compensated because the spring element of Movement of the piston rod in the return stroke counteracts and thus in this movement direction increases the force acting on the piston rod force.
  • the spring element relaxes again and generates a force, which in the direction of action of the piston rod is directed in the working stroke, so that the spring element in the working stroke a exerts additional pressure on the membrane.
  • the spring element thus leads to a uniform load of Exzentertriebs and thus the drive motor, so that the unwanted torque fluctuations be eliminated.
  • a spring element for example a coil spring or other suitable spring elements be used.
  • This advantageous arrangement of a spring element in the piston engine could also be independent of the previously described aspects of the invention in other metering pump be used.
  • the individual components the drive unit lubricated independently.
  • the means the individual bearings and gear parts, especially the Planetary gears, are preferably lubricated for life and encapsulated educated.
  • a liquid lubricant can be arranged in the encapsulated planetary gear.
  • the individual encapsulated bearings can be corresponding liquid lubricants or Greases are present.
  • This independent lubrication of the individual Components of the drive unit causes the interior a transmission housing, in which the drive unit is arranged, in total can be formed dry, d. H. in the interior of the Gearbox housing are no lubricants such as Oil.
  • the piston drive arranged in a crankcase, to which a separate motor outer housing is attached, in which the drive motor as a structural Unit is arranged.
  • This arrangement of the motor outer housing outside the crankcase, d. H. of the transmission housing, in which the piston or eccentric drive is arranged, has the advantage that the Waste heat generated by the engine can be better dissipated to the outside can.
  • the drive motor used forms a structural unit, d. H. it has a stator housing, inside which the stator windings and a rotor, preferably a permanent magnet rotor are.
  • Such a drive motor may be a standard motor, which as a finished component is available on the market.
  • the use of the Motor outer housing has the advantage that the motor outer housing can be sealingly connected to the crankcase, so that the interior of the crankcase and engine outer housing after is sealed on the outside. This is especially important because dosing pumps commonly used in demanding environments, where, for example, they influence the environment due to moisture or Exposed to chemicals.
  • the fully sealed or encapsulated Design of the crankcase together with the attached Motor outer housing protects the components arranged inside, in particular also electrical and electronic components.
  • Such an additional engine outer housing could also be independent realized by the features of the invention described above become.
  • the engine outer housing is on the underside of the crankcase arranged.
  • At the bottom of the crankcase can feet or blocks are formed on which the crankcase rests and between which the motor outer housing is arranged.
  • This arrangement leads to a particularly compact design of the dosing pump, because of the higher, caused by the bucks arrangement of the crankcase usually already due to the design of the crankcase attached membrane pump is required.
  • the fluid connections usually extend vertically, since the in or at these arranged valves usually gravity actuated are and therefore must be arranged in the vertical direction. This requires that the diaphragm pump and the crankcase not can be arranged directly above a footprint, but must be spaced from the footprint so that the vertical extending fluid connections connected to corresponding lines can be.
  • the motor outer housing is provided with ribs, while formed on the stator housing of the drive motor cooling fins which are from the inside into the ribs of the motor outer casing intervention.
  • This embodiment allows a particularly good Heat transfer from the stator housing of the drive motor through the motor outer casing to the outside, so that of the drive motor generated waste heat can be reliably dissipated.
  • the cooling fins of the stator housing in the ribs of the Motor outer casing extend into the paths for the Heat transfer from the cooling fins of the stator by the Motor outer casing kept short outside, so that the heat dissipation is improved.
  • the rib-shaped design of the outer surface the motor outer housing also causes an improved Heat dissipation to the ambient air. Especially when using a brushless DC motor with this arrangement of cooling fins and the ribs of the motor outer housing may be on an additional Fans are omitted for cooling the drive motor.
  • the cooling fins are preferably part of a heat sink, which on a smooth stator housing of the drive motor is placed.
  • This arrangement has the advantage that a standard ausgestalteter electric motor be used with an outwardly smooth stator housing can.
  • cooling fins can be glued to this or be pressed on.
  • the cooling fins are part of a heat sink, which is designed as an extruded profile, which is a round inner cross section and radially outward and parallel to the Having axis of rotation of the drive motor extending cooling fins.
  • the Drive motor is preferably in the round inner cross-section of the Heat sink pressed so that the heat sink firmly on the outside the drive motor is held and a good heat transfer from the stator housing is ensured on the heat sink.
  • an electronic Control or regulating device in the interior of the crankcase arranged, and electrical connection lines of the drive motor run inside the motor outer casing to the controller inside of the crankcase.
  • This arrangement has the advantage that no Connecting lines from the outside of the crankcase attached Drive motor to the arranged inside the crankcase electronic components on the outside of the dosing pump must be guided along. All electrical connection lines between the control components and the drive motor run inside the closed and sealed Housing, consisting of crankcase and engine outer housing.
  • a simple insulation of the electrical cables is sufficient on the other hand, the electrical wires are still through the crankcase and the motor outer housing from environmental influences, For example, moisture or chemicals, protected.
  • the metering pump shown in Fig. 1 has a crankcase 2, which tubular or profiled is formed with two opposite each other lying open end faces. The rear end is through a rear Cover 4 closed, in which display and controls are arranged for the pump. Between the rear cover 4 and the crankcase 2, a seal member 6 is arranged, so that the crankcase 2 through the rear cover 4 at the rear Front side is sealed tight.
  • a support plate 8 is inserted at the front a diaphragm pump 10 is flanged.
  • the diaphragm pump 10 has a cover plate 12, which the support plate 8 at the front covered and at its edge with the front edge of the gear housing 2 sealing comes to the plant.
  • a sealing element 14 between the cover plate 12 and the crankcase 2 arranged to to close the crankcase 2 tight at its front.
  • the Drive unit comprises a gear unit 16, the carrier 17 at the Rear side of the support plate 8 are flanged.
  • the transmission unit 16 has an eccentric shaft 18 and a crank 20, via which a Rotary movement of the eccentric shaft 18 in an oscillating linear stroke movement a piston rod 22 is reacted.
  • the piston rod 22nd extends normal to the axis of rotation of the eccentric shaft 18 and is with her rear end connected to the crank 20.
  • the front end of the Piston rod 22 is connected to diaphragm 24 of diaphragm pump 10, to be able to move these back and forth.
  • the eccentric shaft 18 is driven by a drive motor 26. Between the drive motor 26 and the eccentric shaft 18 is in the drive train a planetary gear 28 is arranged.
  • the drive motor 26 is a brushless DC motor running at high speed. Out For this reason, in the powertrain is a transmission with a large Gear ratio required to set the speed to the for the Crank drive required speed to reduce.
  • the planetary gear 28 has the advantage that on the one hand a very large transmission ratio offers and at the same time trained very small is, so the overall dimensions of the drive unit despite of the very large gear ratio can be reduced.
  • the planetary gear allows a coaxial arrangement of drive motor 26, planetary gear 28 and eccentric shaft 18th As a result, the structure of the drive unit can be further reduced, In particular, the gear unit in the direction of the piston rod Be trained 22 compared to known arrangements shorter. In addition, occur in the coaxial arrangement of all rotating shafts lower bearing forces, so that the used Bearings can be sized smaller.
  • the transmission unit 16 further comprises a spring element in the form of a compression spring 30, which cooperates with the piston rod 22.
  • the spring 30 is supported by its front end A on a bearing plate 29 from which fixed to the piston rod 22nd connected is. At its rear end, the spring 30 is supported on a Abutment plate 31, which in turn is supported on the bolt 33, which connect the two carriers 17 together.
  • the piston rod 22 extends through a passage opening in the contact plate 31 and is movable relative to the abutment plate 31.
  • the abutment plate 29 may also be otherwise connected to the piston rod 22 be connected or in one piece with this as an abutment shoulder be educated.
  • the compression spring is thus arranged so that they on the return stroke of the piston rod 22 is compressed and the working stroke on the membrane 24 acting pumping power supported.
  • the working stroke is moving Piston rod 22 in the direction A on the diaphragm pump 10 and generates a compressive force on the membrane 24, thereby a Fluid displaced from a pump room.
  • the return stroke in the direction B moves the piston rod 22 moves away from the diaphragm pump 10 and pulls it returns the membrane or allows the membrane 24 due its elasticity springs back to its original position. It generates the membrane 24 in the pump chamber of the diaphragm pump 10 a So-called.
  • the compression spring Conversely, the compression spring generates 30 in the working stroke an additional, acting on the membrane 24 Compressive force, so that the pumping process supported by the compression spring 30 becomes.
  • the compression spring 30 thus leads to a uniform Force or torque load of the drive motor 26, since they are in Empty or return stroke generates an additional counterforce.
  • Such uniform torque load allows the use of a fast-running DC motor as drive motor 26.
  • the drive motor 26 is at the bottom of the gear unit 16 and arranged on the underside of the crankcase 2.
  • the crankcase 2 rests on trestles 32, making it vertical from the footprint is spaced.
  • the two blocks 32 are laterally connected by plates, forming a closed frame becomes. This serves to create an outwardly closed appearance to create the metering pump.
  • the blocks 32 can also be separated be formed from each other. Alternatively, you can do it differently trained feet may be provided which one of the footprint vertically spaced arrangement of the crankcase 2 allow. This is necessary because the connections of the diaphragm pump 10 extending in the vertical direction and thus below the pump Room is needed to connecting lines with the diaphragm pump 10th to be able to connect.
  • the vertical extent of the connections of the Diaphragm pump 10 is required because in the connections gravity operated check valves are provided, which in the vertical direction must be arranged.
  • the arrangement of the drive motor 26th below the gear housing 2 thus has the advantage that the free space between the blocks 32 can be exploited by the there Drive motor 26 is arranged.
  • the drive motor 26 forms a completed assembly, i. H. of the Drive motor 26 may be a standard motor available on the market.
  • the drive motor 26 has a stator housing surrounding it outside in which the stator windings and a rotor with bearings arranged are.
  • the thus formed drive motor 26 is of an additional Motor outer housing 34 surrounded.
  • the motor outer housing 34 is attached from the bottom to the crankcase 2, that the motor outer housing 34 with its upper edge on the circumference of Opening 36 comes to rest on the underside of the crankcase 2.
  • a sealing ring 38 is arranged, which the motor outer housing 34th tightly connected to the crankcase 2.
  • the motor outer housing 34 thus, together with the crankcase 2 forms a housing with a enclosed, externally sealed interior in which the transmission unit 16 and in addition electronic control and regulating elements are arranged for the metering pump.
  • the engine outer housing 34 is integrally formed of plastic and on its underside closed.
  • the peripheral wall of the motor outer housing 34 is formed ribbed so that the ribs radially outward and extend parallel to the axis of rotation of the drive motor 26.
  • the Ridges open to the inside of the motor outer housing 34, so that from inside correspondingly formed ribs of a heat sink 40th can engage in the ribs of the motor outer housing 34.
  • the heat sink 40 has inside a circular cross-section, in which the drive motor 26 is inserted.
  • the heat sink 40 is preferably formed as extruded aluminum.
  • the inner cross section of the heat sink 40 is dimensioned so that the drive motor 26 with its stator housing with a press fit into the heat sink 40 can be used, allowing a safe heat transfer from the stator housing of the drive motor 26 to the heat sink 40th is guaranteed.
  • the drive motor 26 with the heat sink 40 is so in the motor outer housing 34 inserted that the fins of the heat sink 40 engage from the inside into the ribs of the motor outer housing.
  • the distance of the outer surface of the motor outer housing 34 to the surface of the heat sink 40 is over the entire Surface of the heat sink 40 low and substantially constant.
  • the remaining space between the heat sink 40 and the inner wall of the motor housing 34 with a potting compound 42 potted to better heat transfer from the To allow heat sink 40 on the motor outer housing 34.
  • motor outer housing 34 Another advantage of the motor outer housing 34 is that the connecting leads 44 in the interior of the motor outer housing 34 to the crankcase 2 and the electronic components arranged therein become. This allows all the wiring between the drive motor and control electronics in the interior of the crankcase 2 and the motor outer housing 34 takes place, so that no electrical lines must be routed to the outside of the metering pump. in the Inside the case, the lines are better from environmental influences protected, furthermore, a simple insulation is sufficient here.
  • each movable Components of the drive and transmission unit is that inside the crankcase or transmission housing 2 no lubricant such.
  • oil be provided for central lubrication of the moving parts got to.
  • the interior of the crankcase 2 thus remains dry, which in particular with regard to the arrangement of electronic components in the Inside the crankcase 2 is advantageous.
  • the described embodiment shows a particularly advantageous Combination of several aspects of the invention.
  • the description is however, to understand that the individual aspects are also independent can be realized from each other. So can the arrangement of the Drive motor 26 with the heat sink 40 in the motor housing 34th can also be used in otherwise differently designed pumps. Also, the use of a piston rod 22 in the return stroke burdening Spring element 30 can also be used in other pump units are used, which is not the described arrangement of the drive motor and a planetary gear.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
EP03010890A 2003-05-15 2003-05-15 Pompe de dosage Expired - Lifetime EP1477676B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP03010890A EP1477676B1 (fr) 2003-05-15 2003-05-15 Pompe de dosage
DE50301675T DE50301675D1 (de) 2003-05-15 2003-05-15 Dosierpumpe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP03010890A EP1477676B1 (fr) 2003-05-15 2003-05-15 Pompe de dosage

Publications (2)

Publication Number Publication Date
EP1477676A1 true EP1477676A1 (fr) 2004-11-17
EP1477676B1 EP1477676B1 (fr) 2005-11-16

Family

ID=33016898

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03010890A Expired - Lifetime EP1477676B1 (fr) 2003-05-15 2003-05-15 Pompe de dosage

Country Status (2)

Country Link
EP (1) EP1477676B1 (fr)
DE (1) DE50301675D1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013037512A1 (fr) 2011-06-20 2013-03-21 R.C.N. Italia Di Acciaro M. Lucia Appareil mobile destiné à la production d'air comprimé
CN103395863A (zh) * 2013-08-22 2013-11-20 苏州巧泰精密机械有限公司 便携式净水装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016101479A1 (de) 2016-01-28 2017-08-03 Pierburg Gmbh Membranverdichter

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2124712A (en) * 1982-08-02 1984-02-22 Medtronic Inc D.C. motor and diaphragm-pump assembly
US4597717A (en) * 1982-09-30 1986-07-01 Truline C.N.C., Inc. Two-stage fluid pump
EP0464229A1 (fr) * 1990-06-20 1992-01-08 Alfred Kärcher GmbH & Co. Appareil portatif de nettoyage à haute pression
GB2282419A (en) * 1993-10-02 1995-04-05 Munster Simms Engineering Limi Diaphragm pump
DE29709831U1 (de) * 1997-06-06 1997-08-14 Wolfgang Eichler GmbH & Co KG, 76327 Pfinztal Dosierpumpe mit einem flanschartigen Zwischenstück zur Montage am Einsatzort
RU2180858C2 (ru) * 1999-12-08 2002-03-27 НИИ трансплантологии и искусственных органов МЗ РФ Вживляемый искусственный желудочек сердца

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2124712A (en) * 1982-08-02 1984-02-22 Medtronic Inc D.C. motor and diaphragm-pump assembly
US4597717A (en) * 1982-09-30 1986-07-01 Truline C.N.C., Inc. Two-stage fluid pump
EP0464229A1 (fr) * 1990-06-20 1992-01-08 Alfred Kärcher GmbH & Co. Appareil portatif de nettoyage à haute pression
GB2282419A (en) * 1993-10-02 1995-04-05 Munster Simms Engineering Limi Diaphragm pump
DE29709831U1 (de) * 1997-06-06 1997-08-14 Wolfgang Eichler GmbH & Co KG, 76327 Pfinztal Dosierpumpe mit einem flanschartigen Zwischenstück zur Montage am Einsatzort
RU2180858C2 (ru) * 1999-12-08 2002-03-27 НИИ трансплантологии и искусственных органов МЗ РФ Вживляемый искусственный желудочек сердца

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013037512A1 (fr) 2011-06-20 2013-03-21 R.C.N. Italia Di Acciaro M. Lucia Appareil mobile destiné à la production d'air comprimé
CN103395863A (zh) * 2013-08-22 2013-11-20 苏州巧泰精密机械有限公司 便携式净水装置

Also Published As

Publication number Publication date
EP1477676B1 (fr) 2005-11-16
DE50301675D1 (de) 2005-12-22

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