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US2820436A - Effecting relative displacement between pusher member and separator cage of a push-type centrifucal machine - Google Patents

Effecting relative displacement between pusher member and separator cage of a push-type centrifucal machine Download PDF

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Publication number
US2820436A
US2820436A US557189A US55718956A US2820436A US 2820436 A US2820436 A US 2820436A US 557189 A US557189 A US 557189A US 55718956 A US55718956 A US 55718956A US 2820436 A US2820436 A US 2820436A
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US
United States
Prior art keywords
piston
cylinder
space
valve
cage
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
US557189A
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English (en)
Inventor
Ruegg Ernst
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.)
Sulzer Escher Wyss AG
Original Assignee
Escher Wyss AG
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 Escher Wyss AG filed Critical Escher Wyss AG
Application granted granted Critical
Publication of US2820436A publication Critical patent/US2820436A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/149—Fluid interconnections, e.g. fluid connectors, passages
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B3/00—Centrifuges with rotary bowls in which solid particles or bodies become separated by centrifugal force and simultaneous sifting or filtering
    • B04B3/02—Centrifuges with rotary bowls in which solid particles or bodies become separated by centrifugal force and simultaneous sifting or filtering discharging solid particles from the bowl by means coaxial with the bowl axis and moving to and fro, i.e. push-type centrifuges
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/0401—Valve members; Fluid interconnections therefor
    • F15B13/0402—Valve members; Fluid interconnections therefor for linearly sliding valves, e.g. spool valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1447—Pistons; Piston to piston rod assemblies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/202—Externally-operated valves mounted in or on the actuator

Definitions

  • the claimed construction has the advantage that the controlling valve mechanism is in the main piston, so that fluid lines can be short, and packedjoints cant be reduced in number. This minimizes disturbing inertial effects and reduces the risks of leakage.
  • the distributing valve is mounted inthe main piston of the motor and shifts along a diametric line in such a way that centrifugal force, developed by rotation of the shafts, assists in completing the valve shift and tends to hold the valve in its shifted position, so that valves which control its motion may be of the utmost simplicity.
  • the invention was developed for use in centrifuges of the pusher feed type, and will be described as so embodied.
  • Fig. 1 is an axial section onthe line'II o-f Fig. 2 through apparatus for producing a relative axial displac ement between the pusher member and" separator cage of a push-type centrifugal machine.
  • Fig. 2 is a section on the lineIL-ll-bf'Fig. 1.
  • Fig. 3 is a modification of the construction of the control apparatus, taken on the same section asin Fig. 2.
  • Fig. 4 is an axial longitudinal section onthe line 'IV-IV of Fig. 1.
  • Fig. 5 is an axial longitudinal section through a pushto Fig. l.
  • the push-type centrifugal machine comprises a'hollow rotary shaft 1.
  • a piston 2 serves to actuate that part of the centrifugal machine which is to be displaced. It is fixed by screws 3 to one end of a central shaft 4 which extends axially through the central bore of the hollow shaft 1 and by which is produced the connection with the part to be displaced.
  • the two shafts are axially shiftable in relation to one another.
  • Fixed to the end of the hollow shaft 1' coaxially therewith is a'cylinder 5 which revolves with the separator cage and 'which'is closed at its outer end by a cover 6.
  • the piston 2 is-arranged in the cylinder Sso as to be axially displaceable in relation thereto and also revolves with the cylinder. It divides the cylinder space axially into. two. chambers 7 and 8.
  • the hollow shaft 1 is supported in a bearing 9 atthe end adjacent the cylinder 5.
  • This bearing serves at thesame time for the supply of pressure fluid, which isv introduced through a pipe 10 and a connecting bore 11 into an annular duct 12 of the bearing.
  • the piston 2 is actuated by fluid, the-said piston int-- parting a reciprocatory movement to the moving part of the centrifugal machine.
  • 'A control device which consists of a-control valve.13 and-two. initialcontrohmembers 2,829,436 Patented Jan. 21, 1958 .l4.-.and .15, controls 1 thesadmission of; pressurefluid alternately toathe. two .sides; of the piston.
  • Thisxcontrol devicea is arranged in-rthe -piston 2 itself.
  • the control valvez13 is arranged in-the piston 2 in a bore 16. extend- .ingatransversely of the axis of rotation. It comprises twowcontrol pistons .17.- and.
  • valve-motor pistonaheads l9v and:20, :-and. 'it, isndisplaceable between twoend positions. which :aresymmetrical With-respect to the-rotational. axis ofsthegpiston 2 andvwhich are determined by two abutments consisting of annular washers 21 .anda22.
  • the control-valve 13 is shown in, its top. end, position. From the-annular: passage 12 of the bearing-9, the pressure fluid supplied by the-pipe 10 passes through transverse. bores 23min the hollow shaft 1 -into anannular passage-24 formed from inside in this hollow shaft. -Axtransverse bore 25 and an axially-extending longitudinal bore-.26 in the. central shaft-4 also produce aconnection.betweenttheannular. passage 24 and an annularr space'27aprovided in .the :piston 2 in the region-of the axis-so asto surround the control valve 13.
  • the passage 33'.- is shown in Fig. 2. and extends transversely of the axis .0f the control valve. From. the passage 35, the. fluid discharges into-a space-36 in-order to be returned from this space through a pipe 37 into a liquid container.
  • the arrangement of the control valve 13 in the piston itself has the advantage that it is only necessary to have a single pipe for the supply of pressure fluid to the rotating parts. Consequently, it is only necessary for the annular passage 12 to be sealed off against high pressure at the transition points from the fixed part to the rotating part.
  • the reversal of the flow of fluid is effected only in short connecting ducts in the piston itself, while the same direction of flow obtains in the supply line as far as the annular duct 27 of the piston 2 and also the discharge ducts 33, 35 and 39, 41 respectively, always have the liquid flowing therethrough in the same direction.
  • the control valve 13 In order constantly to produce a reciprocatory movement of the piston 2 in the cylinder 5, the control valve 13 is always to be changed over to its opposite end position upon the end position of the piston being reached. In the construction according to Figs. 1 and 2, this changeover is effected automatically by the initial control members 14 and 15.
  • the member 14 controls the supply of pressure fluid from the annular passage 27 through the bores 42 and 43 to one end of the transversely extending bore 16 of the piston 2, i. e. to a space 44, which is defined on one side by the valve-motor piston head 20 of the control valve 13.
  • the initial control member controls the flow of pressure fluid through bores 45 and 46 to the other end of the transversely extending bore 16, i. e.
  • the initial control members 14 and 15 are arranged in the piston 2 symmetrically of its axis of rotation and parallel thereto, and are fitted for longitudinal displacement in axial bores 48 and 49, respectively. They are formed with recesses 50 and 51, respectively, which are ofiset relatively to one another.
  • the two control members 14 and 15 could, of course, also be replaced by a single control member for the control of the pressure fluid supply to both the spaces 44 and 47.
  • the control valve 13 remains in the position shown until as the piston approaches the cylinder cover 6, the initial control members 14 and 15 strike against the cover 6 and are thus displaced toward the bearing end relatively to the piston 2.
  • the recess 50 of the iniital control member 14 is displaced away from that position in which the bores 42 and 43 meet, so that the throughflow of pressure fluid is shut off.
  • the recess 51 of the initial control member 15 is displaced to the position where the bores 45 and 46 meet.
  • the path of flow of pressure fluid from the annular space 27 into the space 47 is opened, the control valve 13 being urged against the end washer 22.
  • the initial control members 14 and 15 thus control the flow to the ends of the transversely extending bore 16 of the piston 2, i. e. to the spaces 44 and 47, respectively, adjoining the end.faces of the control valve 13 and in each case, when the piston 2 approaches one of its end positions and owing to abutment on the axial limits of the working space 7 or 8, they are shifted into a position in which, due to the opening of the path for pressure fluid to the corresponding end face of the control valve, the latter is changed over to its opposite end position and thereby initiates a reversal of movement of the piston 2.
  • This initial control device ensures that in all cases the control valve 13 is adjusted into the suitable end position when the piston 2 has to reverse its direction of travel.
  • a changeover operation may, however, be obtained by more simple means, -as represented in Figure 3.
  • the provision of separate initial control members is dispensed with.
  • a bore 56 extends radially outwardly from the space 27 in a direction at right angles to the axis of the control valve in the piston.
  • Formed in the cylinder 5 is a groove 57 which, in the end position of the piston 2 as shown in Figure 1, produces a connection between the bore 56 and the space 44 below the control valve.
  • the groove 57 is of such limited space that the said connection is produced solely in and in the vicinity of the end position. Provision must then be made for the fact that such an amount of pressure fluid can flow through the bore 56 that the control valve is adjusted from the lower to the upper end position before the piston 2 has again left its end position to such an extent that the connection has been broken.
  • a second groove extending symmetrically of the groove 57 in relation to the axis of the piston is to be arranged in the cylinder, which second groove has to produce the connection of the space 47 with the annular space 27 through a radial bore extending in the piston opposite to the bore 56.
  • FIG. 5 shows the assembly of the arrangement with a threestage push-type centrifugal machine.
  • the hollow shaft 1 is arranged in a housing 58, which also encloses the cylinder 5 and is supported in a bearing 59 as well as in the bearing 9.
  • a housing 60 adjoining the housing 58 are three separator cages 61, 62 and 63 successively supplied with the material being centrifuged.
  • the cage 61 is mounted by a boss 64 on that end of the central shaft 4 which projects from the shaft 1.
  • the cage 63 is connected fast to the cage 61 by means of struts or bars 65.
  • the cage 62 is rigidly connected by means of a boss 66 to that end of the shaft 1 which projects beyond the bearing 59. Bars 67 extending through the boss 64 also produce a rigid connection between the boss 66 and a pusher member 68 arranged in the cage 61.
  • the material to be centrifuged is introduced through a pipe 69 and conveyed on to the cage 61 by means of a funnel 70 rigidly connected to the pusher member 68.
  • the cages 61 and 63 are concurrently moved.
  • the cage 61 and the fixed pusher member 68 which cooperates with the cage 61 are moved relatively to one another, and this movement displaces the material on the cage 61 toward the end of the latter, where it passes on to the cage 62, which is fixed axially.
  • the end of the cage 61 serves as a pusher member and the reciprocatory movement thereof causes the material to travel forward on to the last cage 63.
  • the end of the axially fixed cage- 62 again serves as pusher member, whereby the material is finally expelled from the cage 63 and is collected in a part 71 of the housing 60 serving as collecting device, in order then to drop downwardly through an opening 72.
  • the housing 58 also has arranged therein a motor 73 which serves for the drive of the centrifugal machine.
  • the cylinder 5 is at the same time designed as a belt pulley formed with grooves 74, the machine being driven by V-belts which extend around the cylinder 5 and a driving pulley 76 arranged on the motor shaft.
  • the part of the cylinder 5 which is not used for the belt drive may also be used in known manner as a brake drum.
  • control device 13 is arranged in the piston 2 itself, the machine is given a very compact construction. No control devices arranged externally of the machine are to be provided, which devices can render access to the machine difficult while it is running. With the constructional form described, the control piston can readily be removed with the control means after removing the cover 6, this being effected rearwardly and axially, so that also an inspection can easily be made.
  • valve means last named is effective to energize the valveshifting piston means past its mid-stroke and centrifugal force is elfective to complete the terminal portion of such stroke.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Hydraulic Motors (AREA)
  • Centrifugal Separators (AREA)
  • Reciprocating Pumps (AREA)
US557189A 1955-01-13 1956-01-03 Effecting relative displacement between pusher member and separator cage of a push-type centrifucal machine Expired - Lifetime US2820436A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH786392X 1955-01-13

Publications (1)

Publication Number Publication Date
US2820436A true US2820436A (en) 1958-01-21

Family

ID=4536614

Family Applications (1)

Application Number Title Priority Date Filing Date
US557189A Expired - Lifetime US2820436A (en) 1955-01-13 1956-01-03 Effecting relative displacement between pusher member and separator cage of a push-type centrifucal machine

Country Status (7)

Country Link
US (1) US2820436A (xx)
BE (1) BE544199A (xx)
CH (1) CH325931A (xx)
DE (1) DE1003134B (xx)
FR (1) FR1146634A (xx)
GB (1) GB786392A (xx)
NL (2) NL94239C (xx)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3171809A (en) * 1962-04-30 1965-03-02 Baker Perkins Inc Means for effecting the relative movement of a centrifugal separator basket and pusher
US4073731A (en) * 1975-10-21 1978-02-14 Escher Wyss Limited Push-type centrifuge
US4373425A (en) * 1979-07-02 1983-02-15 Georges Moatti Hydraulic engine

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3421036A1 (de) * 1984-06-06 1985-12-12 Klöckner-Humboldt-Deutz AG, 5000 Köln Schubzentrifuge
GB2302712B (en) * 1995-06-29 1998-08-26 John Gerard Foster Fluid pumps

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1254644A (en) * 1916-05-10 1918-01-29 Frank E Allen Water-motor.
US1284225A (en) * 1917-08-10 1918-11-12 Bogart Company Fluid-operated device.
US1928341A (en) * 1930-07-18 1933-09-26 Albert T Otto & Sons Centrifugal machine
US1944391A (en) * 1930-06-05 1934-01-23 Altpeter Ludwig Centrifugal
US2685370A (en) * 1950-09-02 1954-08-03 Escher Wyss Ag Centrifugal machine for continuous operation
US2699152A (en) * 1951-03-16 1955-01-11 Russell Carl Dexter Valve mechanism
US2789545A (en) * 1954-11-29 1957-04-23 Gen Motors Corp Windshield wiper motor
US2789544A (en) * 1954-02-10 1957-04-23 Gen Motors Corp Fluid motor

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1254644A (en) * 1916-05-10 1918-01-29 Frank E Allen Water-motor.
US1284225A (en) * 1917-08-10 1918-11-12 Bogart Company Fluid-operated device.
US1944391A (en) * 1930-06-05 1934-01-23 Altpeter Ludwig Centrifugal
US1928341A (en) * 1930-07-18 1933-09-26 Albert T Otto & Sons Centrifugal machine
US2685370A (en) * 1950-09-02 1954-08-03 Escher Wyss Ag Centrifugal machine for continuous operation
US2699152A (en) * 1951-03-16 1955-01-11 Russell Carl Dexter Valve mechanism
US2789544A (en) * 1954-02-10 1957-04-23 Gen Motors Corp Fluid motor
US2789545A (en) * 1954-11-29 1957-04-23 Gen Motors Corp Windshield wiper motor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3171809A (en) * 1962-04-30 1965-03-02 Baker Perkins Inc Means for effecting the relative movement of a centrifugal separator basket and pusher
US4073731A (en) * 1975-10-21 1978-02-14 Escher Wyss Limited Push-type centrifuge
US4373425A (en) * 1979-07-02 1983-02-15 Georges Moatti Hydraulic engine

Also Published As

Publication number Publication date
BE544199A (xx)
DE1003134B (de) 1957-02-21
NL94239C (xx)
CH325931A (de) 1957-11-30
NL203568A (xx)
FR1146634A (fr) 1957-11-13
GB786392A (en) 1957-11-20

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