US3729832A - Method of and apparatus for drying motor compressors - Google Patents

Method of and apparatus for drying motor compressors Download PDF

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Publication number
US3729832A
US3729832A US00142554A US3729832DA US3729832A US 3729832 A US3729832 A US 3729832A US 00142554 A US00142554 A US 00142554A US 3729832D A US3729832D A US 3729832DA US 3729832 A US3729832 A US 3729832A
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United States
Prior art keywords
drying
motor
streams
casing
stream
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Expired - Lifetime
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US00142554A
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English (en)
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E Lund
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Danfoss AS
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Danfoss AS
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B15/00—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form
    • F26B15/10—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions
    • F26B15/12—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions the lines being all horizontal or slightly inclined
    • F26B15/18—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions the lines being all horizontal or slightly inclined the objects or batches of materials being carried by endless belts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B31/00—Compressor arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/12—Impregnating, moulding insulation, heating or drying of windings, stators, rotors or machines

Definitions

  • the invention relates to a method and apparatus for drying motor compressors of the type having a semispherically shaped casing with a motor compressor unit mounted in the casing.
  • the drying object is achieved by introducing, under pressure, a directed stream (or streams) of a gaseous drying medium into the gap between the wall of the case and the motor compressor unit at several peripheral points and the internal curvature of the casing causes the streams to respectively leave the gap at other peripheral points.
  • the object of the invention is to enable motor compressors to be dried without the use of perchlorethylene, and further to reduce the drying time.
  • this object is achieved by introducing, under pressure, a directed stream of gaseous drying medium into the gap between the wall of the case and the motor compressor and at several peripheral points, and causing it to leave the gap again at another peripheral point.
  • the various peripheral points are thus swept by a very strong induced stream of drying medium, in particular a strong stream of hot air.
  • An intensive drying action is obtained since fresh drying medium, that is able to absorb moisture to a large extent, is passed over each of the various peripheral points, and since the drying medium rapidly moves past the points to be dried and is then discharged, so that no appreciable abatement of the drying action due to saturation with moisture occurs.
  • the time required for drying a normal motor compressor can be reduced to about minutes.
  • the space required for carrying out the drying operation in a production line is correspondingly small.
  • drying medium is introduced at several peripheral points in succession. With this arrangement, a relatively great length of gap is in each case available for the flow of the drying medium supplied. Furthermore, the continuous change in the course of the stream safely prevents the creation of zones ofstagnating drying medium.
  • apparatus for performing this method comprising a drying chamber, with an inlet and outlet, for accommodating at least one case together with the motor compressor, is characterized by a nozzle arrangement fitted in the drying chamber and directed into the gap between the wall of the case and the motor compressor, and by an arrangement for providing relative movement between the nozzle arrangement and the case.
  • the nozzle arrangement is fixed and the arrangement for imparting movement is a conveyor belt.
  • the nozzle arrangement consists of individual nozzles or sets of nozzles disposed alternately on both sides of the cases carried on the belt. The cases, moving along on the belt, are then alternately charged with the drying medium at opposite peripheral points.
  • the drying chamber is a substantially horizontal duct, the height and width of which only slightly exceed the corresponding dimensions of the open case and of the motor compressor.
  • the small volume of the duct ensures that the drying medium emerging from the case can be quickly removed by suction.
  • Suction orifices are preferably provided in that surface of the duct opposite the nozzle arrangement, these orifices being distributed over the length of the duct.
  • the suction orifices can also take the form of a slot. In this way, at most only a very small part of the drying medium supplied through the nozzle arrangement is enabled to circumvent the case and flow directly towards the suction orifice.
  • the cases are open at the top, and the nozzle arrangement is fitted on the top wall of the duct and the suction orifices on the base thereof below the nozzle arrangement.
  • the cases can then simply be placed on a conveyor belt.
  • a very simple construction results if a pressure chamber is provided on the top wall of the duct, and nozzle pipes, projecting into the pressure chamber, are fitted in the lower wall of this chamber. This ensures that nozzle pipes of sufficient length can be used so as to produce the required directed flow yet without the nozzle pipes projecting into the duct where they could impede movement.
  • the vacuum chamber can be provided on the bottom of the duct, and the suction orifices, preferably in the form of a continuous slot, can be contained in the upper wall of the suction chamber. If the pressure and vacuum chambers are associated with the duct in this manner, several ducts can be readily arranged side-byside.
  • the recycling pipe with a multi-stage high-pressure blower for the main part of the drying medium and connecting the vacuum chamber to the pressure chamber; and a pipe for supplying fresh drying medium and comprising a quantity-regulating device, this pipe running into the recycling pipe upstream of the blower and heating apparatus. Part of the moisture is carried away each time with the marginal losses.
  • the recycled and supplemented drying medium can be so treated by the application of heat that is enabled to absorb moisture again.
  • the nozzle arrangement can be fitted on a rotatable plate, the axis of which is aligned with the axis of the case. By rotating the nozzle arrangement relatively to the plate, the peripheral portion at which the drying medium enters can be continuously changed.
  • FIG. 1 is a schematic longitudinal section through drying apparatus in accordance with the invention
  • FIG. 2 is a plan view of the conveyor belt with the nozzle arrangements located above it,
  • FIG. 3 is a cross-section through part of the one embodiment of the apparatus.
  • FIG. 4 is a schematic cross-section through a second embodiment of the apparatus.
  • a pressure chamber 7 Provided on the top wall ofthe duct is a pressure chamber 7 in which nozzle pipes 8 are so arranged that their outlet orifices are disposed at the same level as the top wall of the duct 4.
  • a vacuum chamber 9 Provided below the duct is a vacuum chamber 9, which communicates through a slot 10 with the duct 4. The entire system is surrounded by thermal lagging 11.
  • a recycling conduit 12 runs from the vacuum chamber 9 to a multi-stage blower 13, which passes circulated air through a heating apparatus 14 into the pressure chamber 7. At the inlet and outlet of each duct are located discharge conduits 15, through which marginal losses of drying air are passed to the atmosphere. Fresh supplementary air is passed in through a supply pipe 16 containing a quantity-regulating device 17. It can be expected that 5 percent of the drying air is discharged through the conduits 15, 95 percent of the air is recycled, and thus 5 percent of fresh air is brought into the system.
  • the nozzle pipes 8 are arranged in groups 18 and 19, which are alternately arranged on the two sides of the cases 5 carried on the conveyor belt.
  • the pressure-directed drying air enters the gap between the case S and the motor compressor 6 at the peripheral point a.
  • the air flows through the case roughly in the direction indicated by arrows and is discharged through the slot 10 into the vacuum chamber 9.
  • air then passes from the group 19 of nozzles into the gap between the case 5 and the motor compressor 6 at the peripheral point b, and flows through the case, again in the direction indicated by the arrows. In this way, an intensive drying action is applied alternately from both sides.
  • FIG. 3 shows that the cross-section of the ducts only slightly exceeds that of the case and the motor compressor incorporated therein.
  • the rollers 2 of the conveyor belt 1 can be driven through a common shaft 20.
  • the pressure chambers 7 have a common connection 21, and the vacuum chambers 9 a common connection 22.
  • ducts 4 were arranged side-byside. Each had a length of 3 meters.
  • the conveyor belt moved at a speed of 9 meters per hour, so that the cases left the duct in the dried condition after 20 minutes.
  • the nozzle pipes had a diameter of approximately 8 mm and were approximately 60 mm long.
  • the air was introduced into the pressure chambers 7 at a temperature of roughly 170C. If percent of the air is recycled and only 5 percent of fresh air is supplied, this temperature corresponds to a dew-point of approximately minus 40C.
  • the blower pressure was so selected that a pressure differential of about 1,300 mm water column obtained between the pressure chamber and the vacuum chamber.
  • FIG. 4 shows another embodiment in which a drying chamber 23 is surrounded by lagging 24.
  • a case 5 remains stationary on the bottom of the chamber 23.
  • the plate 25 is rotated by a shaft 26, which is co-axial with I the case 5.
  • the plate 25 carries a nozzle pipe 27 which is supplied with hot air through a passage 28 in the shaft 26.
  • Suction orifices 29 in the bottom of the chamber 23 lead to a vacuum chamber 30.
  • a feed orifice 31 is contained in the end wall.
  • a stream of air is passed from the nozzle 27 into the gap between the case and the motor compressor, the point of introduction being continuously displaced over the periphery.
  • Air can also be directed simultaneously at several peripheral points into the gap between the case and the motor compressor. The air then passes out again between these points of entry.
  • supplying the air alternately on the two sides as illustrated in FIGS. 1 to 3, or instead of the continuous displacement of the point of entry as shown in FIG. 4 use can be made of other ways of supplying the air, for example, at three or four different peripheral points in succession.
  • a method for drying a motor compressor assembly of the type having a generally semispherically shaped casing with a motor and compressor unit mounted therein comprising the step of directing a stream of gaseous drying medium so as to enter into the circumferential space between said unit and the internal surface of said case at one peripheral point and to ieave said circumferential space at another diametrically opposite peripheral point.
  • a method for drying a motor compressor assembly of the type having a generally semispherically shaped casing with a motor and compressor unit mounted therein comprising the step of directing a steam of gaseous drying medium so as to enter into the circumferential space between said unit and the internal surface of said case at one peripheral point and to leave said circumferential space at another peripheral point,

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Power Engineering (AREA)
  • Drying Of Solid Materials (AREA)
US00142554A 1970-05-05 1971-05-12 Method of and apparatus for drying motor compressors Expired - Lifetime US3729832A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702021948 DE2021948A1 (de) 1970-05-05 1970-05-05 Verfahren und Vorrichtung zum Trocknen von Motorkompressoren

Publications (1)

Publication Number Publication Date
US3729832A true US3729832A (en) 1973-05-01

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US00142554A Expired - Lifetime US3729832A (en) 1970-05-05 1971-05-12 Method of and apparatus for drying motor compressors

Country Status (6)

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US (1) US3729832A (enExample)
BR (1) BR7102717D0 (enExample)
DE (1) DE2021948A1 (enExample)
FR (1) FR2091194A5 (enExample)
GB (1) GB1353800A (enExample)
SE (1) SE369224B (enExample)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3884624A (en) * 1973-08-15 1975-05-20 Combustion Eng Nuclear fuel preheating system
US3949522A (en) * 1974-07-26 1976-04-13 Kehl Donald K Greenhouse
US4053993A (en) * 1976-05-24 1977-10-18 Midland-Ross Corporation Oven for a procession of containers
US4492571A (en) * 1981-07-31 1985-01-08 Toyo Seikan Kaisha, Ltd. Baking and drying furnace for containers such as cans
US4887366A (en) * 1988-06-16 1989-12-19 Kuhl Henry Y Article drying apparatus with adjustable drying plenum means
US5271161A (en) * 1992-02-25 1993-12-21 Brinck Ii Joseph A Method and apparatus for roasting barrels
US5423131A (en) * 1992-11-13 1995-06-13 Shibano; Yoshihide Apparatus for drying cleaned workpieces
US6345452B1 (en) * 1998-02-16 2002-02-12 Sidel S.A. Method for drying a hollow body and implementing device
EP1294085A3 (en) * 2001-09-05 2003-10-01 AXIS S.p.A. Heating oven for dynamo-electric machine component manufacture
US20100293901A1 (en) * 2009-05-20 2010-11-25 Martin Malthouse Shrink Systems for Labels
US20120260518A1 (en) * 2011-04-15 2012-10-18 Despatch Industries Limited Partnership Dryer
US11470785B2 (en) * 2019-03-28 2022-10-18 Precision Process Systems, Llc Phenotypic horticulture systems and methods
WO2023247938A1 (en) * 2022-06-21 2023-12-28 Pulpex Limited Receptacle drying system and method
US11938473B2 (en) * 2017-09-13 2024-03-26 Onejoon Gmbh Device and method for thermal or thermo-chemical treatment of material

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018212646A1 (de) * 2018-07-30 2020-01-30 Multivac Sepp Haggenmüller Se & Co. Kg Trocknungsvorrichtung und Verpackungsmaschine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB123769A (en) * 1916-09-04 1919-10-02 Emile Louis Alfred Savy Improvements in Drying Apparatus for Bottles, Jars, Cans or the like Receptacles.
US2385962A (en) * 1941-08-23 1945-10-02 Foundry Equipment Company Method of and apparatus for conditioning molds and the like
US2509396A (en) * 1945-03-26 1950-05-30 Carl F Mayer Drying apparatus for molds
US2644188A (en) * 1952-03-26 1953-07-07 White Cap Co Pneumatic container cleaning apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB123769A (en) * 1916-09-04 1919-10-02 Emile Louis Alfred Savy Improvements in Drying Apparatus for Bottles, Jars, Cans or the like Receptacles.
US2385962A (en) * 1941-08-23 1945-10-02 Foundry Equipment Company Method of and apparatus for conditioning molds and the like
US2509396A (en) * 1945-03-26 1950-05-30 Carl F Mayer Drying apparatus for molds
US2644188A (en) * 1952-03-26 1953-07-07 White Cap Co Pneumatic container cleaning apparatus

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3884624A (en) * 1973-08-15 1975-05-20 Combustion Eng Nuclear fuel preheating system
US3949522A (en) * 1974-07-26 1976-04-13 Kehl Donald K Greenhouse
US4053993A (en) * 1976-05-24 1977-10-18 Midland-Ross Corporation Oven for a procession of containers
US4492571A (en) * 1981-07-31 1985-01-08 Toyo Seikan Kaisha, Ltd. Baking and drying furnace for containers such as cans
US4887366A (en) * 1988-06-16 1989-12-19 Kuhl Henry Y Article drying apparatus with adjustable drying plenum means
US5271161A (en) * 1992-02-25 1993-12-21 Brinck Ii Joseph A Method and apparatus for roasting barrels
US5423131A (en) * 1992-11-13 1995-06-13 Shibano; Yoshihide Apparatus for drying cleaned workpieces
US6345452B1 (en) * 1998-02-16 2002-02-12 Sidel S.A. Method for drying a hollow body and implementing device
EP1294085A3 (en) * 2001-09-05 2003-10-01 AXIS S.p.A. Heating oven for dynamo-electric machine component manufacture
US20100293901A1 (en) * 2009-05-20 2010-11-25 Martin Malthouse Shrink Systems for Labels
US20120260518A1 (en) * 2011-04-15 2012-10-18 Despatch Industries Limited Partnership Dryer
US9589817B2 (en) * 2011-04-15 2017-03-07 Illinois Tool Works Inc. Dryer
US11938473B2 (en) * 2017-09-13 2024-03-26 Onejoon Gmbh Device and method for thermal or thermo-chemical treatment of material
US11470785B2 (en) * 2019-03-28 2022-10-18 Precision Process Systems, Llc Phenotypic horticulture systems and methods
WO2023247938A1 (en) * 2022-06-21 2023-12-28 Pulpex Limited Receptacle drying system and method

Also Published As

Publication number Publication date
BR7102717D0 (pt) 1973-06-07
GB1353800A (en) 1974-05-22
SE369224B (enExample) 1974-08-12
DE2021948A1 (de) 1972-02-03
FR2091194A5 (enExample) 1972-01-14

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