EP0615070B1 - Plant with a pump unit for circulating heated liquid within the plant - Google Patents

Plant with a pump unit for circulating heated liquid within the plant Download PDF

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Publication number
EP0615070B1
EP0615070B1 EP94103335A EP94103335A EP0615070B1 EP 0615070 B1 EP0615070 B1 EP 0615070B1 EP 94103335 A EP94103335 A EP 94103335A EP 94103335 A EP94103335 A EP 94103335A EP 0615070 B1 EP0615070 B1 EP 0615070B1
Authority
EP
European Patent Office
Prior art keywords
plant
liquid
pump unit
pump
electric motor
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.)
Expired - Lifetime
Application number
EP94103335A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0615070A1 (en
Inventor
Leif Rasmussen
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.)
T Smedegaard AS
Original Assignee
T Smedegaard 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 T Smedegaard AS filed Critical T Smedegaard AS
Publication of EP0615070A1 publication Critical patent/EP0615070A1/en
Application granted granted Critical
Publication of EP0615070B1 publication Critical patent/EP0615070B1/en
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
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/586—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps
    • F04D29/588—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps cooling or heating the machine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/586—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps
    • F04D29/5893—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps heat insulation or conduction

Definitions

  • the present invention relates to a plant with a pump unit for circulating heated liquid within the plant, said pump unit comprising a liquid pump and an electric motor driving the liquid pump.
  • circulating pumps of the so-called wet-rotor type are conventionally used, said pumps being cooled in part by the circulating liquid in the region between the rotor and the stator, in part by the ambient air in the region around the motor housing.
  • a motor with a dry-running rotor is used, the motor being air-cooled, this cooling conventionally being augmented by a blower rotor mounted on the motor shaft.
  • Both these types of circulating pumps dissipate a substantial amount of heat to the surroundings, thus constituting a source of undesired heating of the space, in which they are situated.
  • the dissipated heat comes in part from the motor losses, in part from the heated liquid being circulated.
  • EP-A-0 467 282 describes a pump unit, which is cooled by circulating a part-flow of the pumped liquid in a cooling jacket.
  • the pumped liquid is mentioned as being waste water or sludge. Accordingly there is no intentional heating of this liquid and the temperature can be expected to be in the range 5-15°C.
  • This document does not mention anything about recovery of heat or preservation of energy. The only object of this document is to cool the motor and to remove air from the cooling jacket.
  • US-A-4 854 373 discloses a pump unit for circulating heated liquid.
  • the motor is partially cooled by circulating a part-flow of the circulated liquid in a separate externally mounted cooling jacket covering approximately one half of the surface of the motor. Since the flow of the liquid in the cooling jacket can be controlled, the motor has to be cooled in an alternative way, when this control reduces the cooling via the cooling jacket. This part of the cooling represents loss of energy to the surroundings.
  • DE-A-31 09 624 describes thermally insulation of a pump unit with the purpose of transporting the heated water with minimum heat loss. This document does not mention anything about recovery of the losses in the motor, to achieve a substantial energy saving.
  • the pump unit is a so-called wet-rotor type whereas the present invention relates to a pump unit with a dry running rotor.
  • a further improvement of the operating economy is achieved by insulating the complete pump unit, this having been made possible by the fact that it no longer depends on air cooling to keep the temperature at a suitably low level.
  • this insulation is provided by means of a set of insulating shells, preferably made of polyurethane foam, mounted around the pump unit, making it possible to perform maintenance and inspection work on the pump unit by simply removing the insulating shells.
  • the pump unit shown on the drawing comprises a pump housing 1 with an inlet connection 2 and an outlet connection 3 for the heated liquid being circulated. Inside the pump housing 1, a pump impeller 5 is mounted on a motor shaft 4.
  • the motor driving the pump is a conventional electric motor, e.g. a three-phase asynchronous motor, with a stator 6 and a rotor 7 on the motor shaft 4.
  • the motor is provided with a cooling jacket 8 embracing the stator 6. Cooling ducts 9 for the circulation of cooling liquid are provided in the cooling jacket 8, said cooling liquid being taken from the pressure side of the pump and returned to its suction side.
  • the pump unit is insulated from the surroundings by means of a set of insulating shells 10, surrounding or embracing the pump unit completely with the exception of openings for the inlet and outlet connections 2,3, for electrical connections to the stator windings and for access with a view to expelling air from the cooling ducts.
  • a saving in operating costs is achieved, if a pump unit as described above is made to replace the traditional circulation pump, in which the motor is cooled by air, this cooling being augmented by means of a blower rotor mounted on the motor shaft.
  • This is in part due to the higher efficiency of the electric motor, not having to drive a blower rotor mounted on its shaft, in part that the heat losses of the motor are transferred to the circulating liquid, thus effecting a corresponding saving in oil or natural gas for heating the liquid.
  • a further reduction of the heat losses to the surroundings is achieved by the fact that the pump unit as a whole is insulated from the surroundings.
  • a pump unit comprising an un-insulated liquid pump and a blower-cooled electric motor, exhibits the following operating costs, the price of electricity being set to 1 kr./kWh and oil or natural gas, account taken for boiler efficiency, is set to a price of 0.50 kr./kWh (all amounts in Danish kr.).
  • Efficiency of blower-cooled motor: ⁇ 0.82.
  • Consumption: 3 kW/0.82 3.65 kW.
  • T 100° C
  • Surface area of the pump housing 0,20 m 2
  • Heat loss from pump housing: 0.023 x 80 x 0.20 0.372 kW
  • Fuel consumption per hour: 0.372 x 0.50 0,19 kr.
  • Total operating cost per hour: 3.33 + 0.35 - 0.16 3.52 kr.
  • the pump unit is insulated as shown by means of a set of insulating shells of polyurethane foam.
  • the thickness of the insulating material is 60 mm and the surface area of the insulating jacket is 0.78 m 2 .
  • the price of the pump is of the order of magnitude 6000 kr., at least the increase in cost for the special embodiment will have paid for itself in the course of one year.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Cookers (AREA)
  • Central Heating Systems (AREA)
EP94103335A 1993-03-10 1994-03-04 Plant with a pump unit for circulating heated liquid within the plant Expired - Lifetime EP0615070B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK027393A DK169001B1 (da) 1993-03-10 1993-03-10 Anlæg omfattende en pumpeenhed til cirkulation af opvarmet væske i anlægget
DK273/93 1993-03-10

Publications (2)

Publication Number Publication Date
EP0615070A1 EP0615070A1 (en) 1994-09-14
EP0615070B1 true EP0615070B1 (en) 1997-05-14

Family

ID=8091691

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94103335A Expired - Lifetime EP0615070B1 (en) 1993-03-10 1994-03-04 Plant with a pump unit for circulating heated liquid within the plant

Country Status (4)

Country Link
EP (1) EP0615070B1 (da)
AT (1) ATE153108T1 (da)
DE (1) DE69403121T2 (da)
DK (1) DK169001B1 (da)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19633137A1 (de) * 1996-08-16 1998-02-19 Wolff Horst Dipl Ing Fh Umwälzpumpe zur Förderung von Flüssigkeiten
WO2011034840A2 (en) * 2009-09-15 2011-03-24 Lawrence Pumps, Inc. Vertically rotatable shaft assembly with thermally insulated housing
DE102014208297B4 (de) * 2014-05-02 2019-10-31 Homa Pumpenfabrik Gmbh Pumpenanordnung

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3109624C2 (de) * 1981-03-13 1986-01-30 Wilo-Werk Gmbh & Co Pumpen- Und Apparatebau, 4600 Dortmund Umwälzpumpe
US4854373A (en) * 1988-03-30 1989-08-08 Williams Gordon G Heat exchanger for a pump motor
DE4022610A1 (de) * 1990-07-16 1992-01-23 Abs Pumpen Ag Vorrichtung zur selbsttaetigen entlueftung einer kuehlkammer
DE4118057A1 (de) * 1991-06-01 1992-12-03 Oplaender Wilo Werk Gmbh Verpackung einer pumpe

Also Published As

Publication number Publication date
DK27393D0 (da) 1993-03-10
ATE153108T1 (de) 1997-05-15
EP0615070A1 (en) 1994-09-14
DK169001B1 (da) 1994-07-25
DE69403121D1 (de) 1997-06-19
DE69403121T2 (de) 1997-09-18
DK27393A (da) 1994-07-25

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