US3032259A - Turbocompressor having a radial diffuser - Google Patents

Turbocompressor having a radial diffuser Download PDF

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Publication number
US3032259A
US3032259A US776530A US77653058A US3032259A US 3032259 A US3032259 A US 3032259A US 776530 A US776530 A US 776530A US 77653058 A US77653058 A US 77653058A US 3032259 A US3032259 A US 3032259A
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United States
Prior art keywords
ring
diffuser
members
compressor
walls
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
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US776530A
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English (en)
Inventor
Jassniker Kurt
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Sulzer AG
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Sulzer AG
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Publication date
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Publication of US3032259A publication Critical patent/US3032259A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D17/00—Regulating or controlling by varying flow
    • F01D17/10—Final actuators
    • F01D17/12—Final actuators arranged in stator parts
    • F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
    • F01D17/141—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path
    • F01D17/143—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path the shiftable member being a wall, or part thereof of a radial diffuser
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0005—Control, e.g. regulation, of pumps, pumping installations or systems by using valves
    • F04D15/0022—Control, e.g. regulation, of pumps, pumping installations or systems by using valves throttling valves or valves varying the pump inlet opening or the outlet opening
    • 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/46—Fluid-guiding means, e.g. diffusers adjustable
    • F04D29/462—Fluid-guiding means, e.g. diffusers adjustable especially adapted for elastic fluid pumps
    • F04D29/464—Fluid-guiding means, e.g. diffusers adjustable especially adapted for elastic fluid pumps adjusting flow cross-section, otherwise than by using adjustable stator blades
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2250/00—Geometry
    • F05D2250/50—Inlet or outlet
    • F05D2250/52—Outlet

Definitions

  • the present invention relates to a turbocompressor having a diffuser whose flow area can be changed by changing the distance between opposite walls of the diffuser, an axially movable annular member forming part of one of the opposed walls of the diffuser and placed coaxially of the rotation axis of the compressor being provided for this purpose.
  • the flow area of the diffuser can be changed by means of an annular insert in one of the diffuser walls which insert is part of a tubular hydraulic piston arranged in a suitable cavity of the pump housing and actuated by means of a pressure liquid.
  • the diffuser has an axial clearance x and a flow area Q
  • a reduction of the axial clearance by the length a may effect a reduction of the flow area of the diffuser by If the initial clearance of the diffuser is a reduction of the clearance by the same length a effects a reduction of the initial flow area by approximately The same control stroke of the piston produces an increasing reduction of the flow area at decreasing flow area Q.
  • the pump is used as a drainage pump which may be controlled in a relatively rough manner this control characteristic is unimportant. However, it becomes very important and may be the cause of control instabilities which are difficult to compensate, if the compressor forms 'part of a sensitive system, for example, of a refrigeration cycle.
  • an annular member which forms part of a wall of the diffuser of the compressor is axially movable but not rotatable and is propped against a ring element, which is coaxial of the rotation axis of the compressor and rotatable, by means of at least three props which are placed substantially in an imaginary cylindrical surface which is coaxial of the rotation axis of the compressor. The inclination of the props relatively to the rotation axis of the compressor is changed upon rotation of the ring element whereby the annular wall member is axially displaced.
  • the annular member is preferably urged against the props and the latter against the ring element by suitable spring means.
  • connecting ice means are interposed between the annular member and the props, the connecting means being guided in the pump housing to move parallel to the rotation axis of the compressor.
  • a sealing packing may be provided between the circumferential surface of the annular member and the respective surface of an annular opening in the compressor housing in which opening the annular member is axially movable.
  • a preferred arrangement for the link or propping means between the annular member and the ring element includes props or pin elements having spherical ends whereby one spherical end of the pin elements extends into a suitable recess in the ring element and the other spherical end of the pin element abuts against the aforesaid connecting means and is received in the respective guide in the compressor housing.
  • FIG. 1 is an axial sectional view of a compressor according to the invention.
  • FIG. 2 shows the axially displaceable wall member and its actuating mechanism, forming part of the compressor shown in FIG. 1, in two different operating positions, the actuating mechanism including adjusting means.
  • numeral 1 designates a diffuser having two parallel walls 2 and 3.
  • a portion of the wall 3 is formed by an annular member 4 which is coaxial of the rotation axis of the compressor and axially movable so that the diffuser clearance S can be changed.
  • the member 4 is received in an annular cavity 5 in the compressor housing 6.
  • the annular member 4 has a shoulder 9 resting on a spring 10 and is pressed by the latter through connecting means 11 and props or pins 12 against a ring element 13. The latter is coaxial of and rotatable on the rotation axis A-B of the compressor.
  • a packing 7 is interposed between the circumferential surface of the annular member 4 and the opposed cylindrical wall of the cavity 5. There is no packing in the clearance between the inner circumference of the annular plate 4 and the casing 6. Since the cavity 5 communicates relatively freely with the inlet of the diffuser, the pressure in the cavity 5 cannot noticeably rise above the static pressure at the inlet of the diffuser whereas the pressure acting on the relatively large surface of the member 4 which forms a side wall portion of the diffuser is higher due to the increase of the static pressure in the diffuser. This higher pressure assists the action of the spring 10.
  • the connecting means 11 do not serve only for transmitting pressure but also for axially guiding the movement of the annular member 4 and preventing rotation of theannular member.
  • the elements Ill are axially guided in suitable guides 14 in the casing 6. These guides 14 also individually receive spherical ends 15 of the props or pin elements 12, the other ends of the elements 12 being individually provided with spherical heads 15 which individually rest in suitable recesses 16 in the ring element 13.
  • a great number of conventional means may be used for rotating the ring elements 13.
  • the drawing shows a worm 17 cooperating with teeth 18 onthe circumference of the ring 13.
  • elastic wall members or elements for example, tubular bellows 2t, are provided which individually surround the connecting means it and which are connected with the annular member 4 and with the stationary compressor housing 6.
  • the connecting means 11 are preferably in the form of pins which are inserted in suitable cylindrical recesses 21 in the annular member 4.
  • FIG. 2 illustrates the principle of the displacing mechanism according to the invention.
  • the upper part of FIG. 2 shows the mechanism in a position in which the ring 13 is in one of its extreme positions whereby the prop 12 is at an angle or with respect to the rotation axis AB of the compressor.
  • the lower part of FIG. 2 shows the other extreme position of the ring 13 in which the props 12 are parallel to the axis A-B.
  • the mechanism is so designated that the range of axial displacement of the annular member 4 is equal to the length x.
  • the space between the wall 2 and the member 4 amounts to S whereas in the lower part of FIG. 2 it amounts to S".
  • the initial stroke of the control mechanism can be adjusted by manipulation of an adjusting screw 22.
  • the invention is not limited to the mechanism shown and described by way of example.
  • the configuration of the individual elements of the propping or connecting mechanism may, of course, be changed without departing from the purview of the present invention.
  • the compressor may have a plurality of stages.
  • a turbocompressor comprising a casing, a rotor, a diffuser arranged around said rotor and being, in part, formed by said casing, said diffuser having opposite walls, an axially movable annular member placed coaxial of said rotor and having a surface portion forming part of one of said walls, said casing having an inside surface portionextending radially'of the rotation axis of said-rotor, a rotatable ring element placed coaxial of said rotor and resting against said surface portion, said casing having a portion interposed between and spaced from said annular member and said surface portion and having apertures, plural link means connected to said annular member and to said ring element and extending through said apertures and constructed and arranged so as to axially displace said annular member for changing the flow area of said diffuser upon a rotary motion of said ring element, and axially yieldable Wall members fluid tightly connected to and interposed between said annular member and said casing portion and forming a space around each of said link
  • a turbocompressor as defined in claim 1 including spring means interposed between said annular member and said casing for pressing said annular member against said link means and the latter against said ring element and the said ring element against said surface portion.
  • a compressor accordingto'claim 3 wherein said casing has a cavity accommodating said annular membet and at least a portion of said connecting means, said wall members being tubular and placed in said cavity and individually surrounding said portion of said connecting means in said cavity.
  • said link means includes pin elements having spherical ends interposed between and abuttingly engaging said connecting means and said ring element, said pin elements being placed in a substantiallycylindrical imaginary surface which is coaxial of the rotation axis of said rotor, said pin elements being slanted to a greater or lesser degree with respect to said rotation axis upon a rotary motion of said ring element in one or in the opposite direction for changingthe axial position of said connecting means and of said annular member in said casing.
  • a turbocompressor according to claim 1 wherein said casing has a cavity having an annular opening accommodating said annular member, said opening and said annular member having corresponding opposite cylindrical outside surfaces, packing means being placed between said cylindrical surfaces.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Reciprocating Pumps (AREA)
US776530A 1957-12-23 1958-11-26 Turbocompressor having a radial diffuser Expired - Lifetime US3032259A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH881882X 1957-12-23

Publications (1)

Publication Number Publication Date
US3032259A true US3032259A (en) 1962-05-01

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US776530A Expired - Lifetime US3032259A (en) 1957-12-23 1958-11-26 Turbocompressor having a radial diffuser

Country Status (5)

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US (1) US3032259A (fr)
CH (1) CH355889A (fr)
DE (1) DE1107086B (fr)
GB (1) GB881882A (fr)
NL (2) NL98031C (fr)

Cited By (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3160392A (en) * 1962-01-05 1964-12-08 David U Hunter Turbine with variable nozzle
US3251539A (en) * 1963-05-15 1966-05-17 Westinghouse Electric Corp Centrifugal gas compressors
US3289919A (en) * 1964-11-16 1966-12-06 Westinghouse Electric Corp Centrifugal gas compressors
US3362625A (en) * 1966-09-06 1968-01-09 Carrier Corp Centrifugal gas compressor
US3365120A (en) * 1964-05-11 1968-01-23 Sulzer Ag Turbine radial diffuser
US3391859A (en) * 1966-02-23 1968-07-09 Caterpillar Tractor Co Turbocharger compressor with variable area diffuser
US3426964A (en) * 1966-10-11 1969-02-11 Dresser Ind Compressor apparatus
US3478955A (en) * 1968-03-11 1969-11-18 Dresser Ind Variable area diffuser for compressor
US3619078A (en) * 1970-06-22 1971-11-09 Carrier Corp Centrifugal gas compressor
US3941498A (en) * 1974-04-08 1976-03-02 Chandler Evans Inc. Variable geometry collector for centrifugal pump
US3975911A (en) * 1974-12-27 1976-08-24 Jury Borisovich Morgulis Turbocharger
EP0012895A1 (fr) * 1978-12-26 1980-07-09 Carrier Corporation Compresseur centrifuge de vapeur et contrôle de son diffuseur
US4219305A (en) * 1978-12-26 1980-08-26 Carrier Corporation Diffuser control
US4257733A (en) * 1978-12-26 1981-03-24 Carrier Corporation Diffuser control
US4378194A (en) * 1980-10-02 1983-03-29 Carrier Corporation Centrifugal compressor
US4460310A (en) * 1982-06-28 1984-07-17 Carrier Corporation Diffuser throttle ring control
US4824323A (en) * 1987-03-05 1989-04-25 Borsig Gmbh Radial turbo-machine with disc diffusor
US4869642A (en) * 1988-06-09 1989-09-26 Allied-Signal Inc. Variable output vortex pump
US4877369A (en) * 1988-02-08 1989-10-31 Dresser-Rand Company Vaned diffuser control
US4902200A (en) * 1988-04-25 1990-02-20 Dresser-Rand Company Variable diffuser wall with ribbed vanes
US4932835A (en) * 1989-04-04 1990-06-12 Dresser-Rand Company Variable vane height diffuser
US5116197A (en) * 1990-10-31 1992-05-26 York International Corporation Variable geometry diffuser
US6431823B1 (en) * 2000-07-13 2002-08-13 Yudko Slepoy Centrifugal pump with variable capacity and pressure
WO2004053336A1 (fr) * 2002-12-06 2004-06-24 York International Corporation Mecanisme de diffusion a geometrie variable
US20060263212A1 (en) * 2005-04-29 2006-11-23 Sulzer Pumpen Ag Sealing arrangement for the attachment of a side plate of a centrifugal pump and an attachment screw used therewith
US20070227603A1 (en) * 2003-12-10 2007-10-04 Jean-Luc Perrin Variable Nozzle Device for a Turbocharger
US20090049834A1 (en) * 2007-08-21 2009-02-26 Emmanuel Bouvier Turbocharger with sliding piston assembly
US20090290979A1 (en) * 2008-05-23 2009-11-26 Mitsubishi Heavy Industries, Ltd. Compressor housing
US20110038714A1 (en) * 2008-04-29 2011-02-17 Jeffrey Carter Variable geometry turbine
US20150275917A1 (en) * 2014-03-26 2015-10-01 Kabushiki Kaisha Toyota Jidoshokki Centrifugal Compressor
US20160208808A1 (en) * 2013-08-26 2016-07-21 Gree Electric Appliances, Inc. Of Zhuhai Regulator assembly and centrifugal compressor
US20180320694A1 (en) * 2015-11-06 2018-11-08 Pierburg Gmbh Control arrangement for a mechanically controllable coolant pump of an internal combustion engine
US10378553B2 (en) 2012-11-09 2019-08-13 Johnson Controls Technology Company Variable geometry diffuser having extended travel and control method thereof
US11773870B1 (en) 2022-09-12 2023-10-03 Hamilton Sundstrand Corporation Variable channel diffuser
US11873839B1 (en) * 2022-09-12 2024-01-16 Hamilton Sundstrand Corporation Variable vaneless diffuser with moving floor
US11885352B1 (en) * 2022-09-12 2024-01-30 Hamilton Sundstrand Corporation Variable channel diffuser with moving floor

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104632712B (zh) * 2013-11-21 2017-02-08 珠海格力电器股份有限公司 叶轮机械及其扩压器
CN112412809A (zh) * 2020-11-20 2021-02-26 潘碧琼 一种可降低内部压力脉动离心泵

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE78038C (de) * BROD-I NITZ & SEYDEL, Berlin N., Am Weddingpl Centrifugalpumpe mit veränderlicher Weite der Ausströmung im Schaufelrade
US1322810A (en) * 1919-11-25 Rotary pump with adjustable gate
GB305214A (en) * 1928-02-02 1929-10-31 Rateau Soc Improvements in or relating to means for controlling the running of centrifugal machines
US2285976A (en) * 1940-01-15 1942-06-09 Gen Electric Centrifugal compressor
US2875696A (en) * 1951-12-05 1959-03-03 Zborowski Helmut Ph G A R Von Centrifugal pumps, in particular for feeding fuel to fuel injection engines
US2933237A (en) * 1957-05-20 1960-04-19 Gen Electric Compressor

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE78038C (de) * BROD-I NITZ & SEYDEL, Berlin N., Am Weddingpl Centrifugalpumpe mit veränderlicher Weite der Ausströmung im Schaufelrade
US1322810A (en) * 1919-11-25 Rotary pump with adjustable gate
GB305214A (en) * 1928-02-02 1929-10-31 Rateau Soc Improvements in or relating to means for controlling the running of centrifugal machines
US2285976A (en) * 1940-01-15 1942-06-09 Gen Electric Centrifugal compressor
US2875696A (en) * 1951-12-05 1959-03-03 Zborowski Helmut Ph G A R Von Centrifugal pumps, in particular for feeding fuel to fuel injection engines
US2933237A (en) * 1957-05-20 1960-04-19 Gen Electric Compressor

Cited By (49)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3160392A (en) * 1962-01-05 1964-12-08 David U Hunter Turbine with variable nozzle
US3251539A (en) * 1963-05-15 1966-05-17 Westinghouse Electric Corp Centrifugal gas compressors
US3365120A (en) * 1964-05-11 1968-01-23 Sulzer Ag Turbine radial diffuser
US3289919A (en) * 1964-11-16 1966-12-06 Westinghouse Electric Corp Centrifugal gas compressors
US3391859A (en) * 1966-02-23 1968-07-09 Caterpillar Tractor Co Turbocharger compressor with variable area diffuser
US3362625A (en) * 1966-09-06 1968-01-09 Carrier Corp Centrifugal gas compressor
US3426964A (en) * 1966-10-11 1969-02-11 Dresser Ind Compressor apparatus
US3478955A (en) * 1968-03-11 1969-11-18 Dresser Ind Variable area diffuser for compressor
US3619078A (en) * 1970-06-22 1971-11-09 Carrier Corp Centrifugal gas compressor
US3941498A (en) * 1974-04-08 1976-03-02 Chandler Evans Inc. Variable geometry collector for centrifugal pump
US3975911A (en) * 1974-12-27 1976-08-24 Jury Borisovich Morgulis Turbocharger
EP0012895A1 (fr) * 1978-12-26 1980-07-09 Carrier Corporation Compresseur centrifuge de vapeur et contrôle de son diffuseur
US4219305A (en) * 1978-12-26 1980-08-26 Carrier Corporation Diffuser control
US4257733A (en) * 1978-12-26 1981-03-24 Carrier Corporation Diffuser control
US4378194A (en) * 1980-10-02 1983-03-29 Carrier Corporation Centrifugal compressor
US4460310A (en) * 1982-06-28 1984-07-17 Carrier Corporation Diffuser throttle ring control
US4824323A (en) * 1987-03-05 1989-04-25 Borsig Gmbh Radial turbo-machine with disc diffusor
US4877369A (en) * 1988-02-08 1989-10-31 Dresser-Rand Company Vaned diffuser control
US4902200A (en) * 1988-04-25 1990-02-20 Dresser-Rand Company Variable diffuser wall with ribbed vanes
US4869642A (en) * 1988-06-09 1989-09-26 Allied-Signal Inc. Variable output vortex pump
US4932835A (en) * 1989-04-04 1990-06-12 Dresser-Rand Company Variable vane height diffuser
US5116197A (en) * 1990-10-31 1992-05-26 York International Corporation Variable geometry diffuser
US6431823B1 (en) * 2000-07-13 2002-08-13 Yudko Slepoy Centrifugal pump with variable capacity and pressure
US6872050B2 (en) 2002-12-06 2005-03-29 York International Corporation Variable geometry diffuser mechanism
WO2004053336A1 (fr) * 2002-12-06 2004-06-24 York International Corporation Mecanisme de diffusion a geometrie variable
US7581394B2 (en) * 2003-12-10 2009-09-01 Honeywell International Inc. Variable nozzle device for a turbocharger
US20070227603A1 (en) * 2003-12-10 2007-10-04 Jean-Luc Perrin Variable Nozzle Device for a Turbocharger
US8272823B2 (en) 2005-04-29 2012-09-25 Sulzer Pumpen Ag Sealing arrangement for the attachment of a side plate of a centrifugal pump and an attachment screw used therewith
US20080056846A1 (en) * 2005-04-29 2008-03-06 Sulzer Pumpen Ag Sealing arrangement for the attachment of a side plate of a centrifugal pump and an attachment screw used therewith
US7306427B2 (en) 2005-04-29 2007-12-11 Sulzer Pumpen Ag Sealing arrangement for the attachment of a side plate of a centrifugal pump and an attachment screw used therewith
CN1854530B (zh) * 2005-04-29 2010-05-26 苏舍泵有限公司 用于连接离心泵侧板的密封配置及其使用的连接螺钉
US20060263212A1 (en) * 2005-04-29 2006-11-23 Sulzer Pumpen Ag Sealing arrangement for the attachment of a side plate of a centrifugal pump and an attachment screw used therewith
US20090049834A1 (en) * 2007-08-21 2009-02-26 Emmanuel Bouvier Turbocharger with sliding piston assembly
US7762067B2 (en) * 2007-08-21 2010-07-27 Honeywell International, Inc. Turbocharger with sliding piston assembly
US20110038714A1 (en) * 2008-04-29 2011-02-17 Jeffrey Carter Variable geometry turbine
US8636467B2 (en) 2008-04-29 2014-01-28 Cummins Turbo Technologies Limited Variable geometry turbine
US20090290979A1 (en) * 2008-05-23 2009-11-26 Mitsubishi Heavy Industries, Ltd. Compressor housing
US8251650B2 (en) * 2008-05-23 2012-08-28 Mitsubishi Heavy Industries, Ltd. Compressor housing
US10378553B2 (en) 2012-11-09 2019-08-13 Johnson Controls Technology Company Variable geometry diffuser having extended travel and control method thereof
US11092166B2 (en) 2012-11-09 2021-08-17 Johnson Controls Technology Company Variable geometry diffuser having extended travel and control method thereof
US20160208808A1 (en) * 2013-08-26 2016-07-21 Gree Electric Appliances, Inc. Of Zhuhai Regulator assembly and centrifugal compressor
US10082147B2 (en) * 2013-08-26 2018-09-25 Gree Electric Appliances, Inc. Of Zhuhai Regulator assembly and centrifugal compressor
US9874226B2 (en) * 2014-03-26 2018-01-23 Kabushiki Kaisha Toyota Jidoshokki Centrifugal compressor
US20150275917A1 (en) * 2014-03-26 2015-10-01 Kabushiki Kaisha Toyota Jidoshokki Centrifugal Compressor
US20180320694A1 (en) * 2015-11-06 2018-11-08 Pierburg Gmbh Control arrangement for a mechanically controllable coolant pump of an internal combustion engine
US11181112B2 (en) * 2015-11-06 2021-11-23 Pierburg Gmbh Control arrangement for a mechanically controllable coolant pump of an internal combustion engine
US11773870B1 (en) 2022-09-12 2023-10-03 Hamilton Sundstrand Corporation Variable channel diffuser
US11873839B1 (en) * 2022-09-12 2024-01-16 Hamilton Sundstrand Corporation Variable vaneless diffuser with moving floor
US11885352B1 (en) * 2022-09-12 2024-01-30 Hamilton Sundstrand Corporation Variable channel diffuser with moving floor

Also Published As

Publication number Publication date
NL224304A (fr)
NL98031C (fr)
GB881882A (en) 1961-11-08
DE1107086B (de) 1961-05-18
CH355889A (de) 1961-07-31

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