US3552894A - Sealing strip - Google Patents

Sealing strip Download PDF

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Publication number
US3552894A
US3552894A US755644A US3552894DA US3552894A US 3552894 A US3552894 A US 3552894A US 755644 A US755644 A US 755644A US 3552894D A US3552894D A US 3552894DA US 3552894 A US3552894 A US 3552894A
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US
United States
Prior art keywords
sealing
strip
rotary piston
strips
slide
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
US755644A
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English (en)
Inventor
Werner Johann Hermann Schroder
Peter Klaus Jurgen Muller
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.)
Fried Krupp AG
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Fried Krupp AG
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Filing date
Publication date
Application filed by Fried Krupp AG filed Critical Fried Krupp AG
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Publication of US3552894A publication Critical patent/US3552894A/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/30—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C2/34—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
    • F04C2/344—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
    • F04C2/3448—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member with axially movable vanes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/08—Rotary pistons
    • F01C21/0809—Construction of vanes or vane holders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/08—Rotary pistons
    • F01C21/0809—Construction of vanes or vane holders
    • F01C21/0881—Construction of vanes or vane holders the vanes consisting of two or more parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
    • F04C15/003—Sealings for working fluid between radially and axially moving parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/30—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C2/34—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
    • F04C2/356—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the outer member
    • F04C2/3562—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the outer member the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation

Definitions

  • FIGS In venlors fl prker Z1000 A e/m 00h rov I Jan. 5, i971 w.J.. H. SCHRDDER ErAL 3,552,894
  • a rotary piston machine in which one of two members rotatable relative to each other has guided in pockets thereof sealing slides each of which is pressed against the other member, and in which the ends of the gaps between first strip means in said sealing slides and the respective adjacent portions of said other member is covered by cover strips arranged in grooves provided in said pocket containing member and extending in the direction of displacement of said sealing slides, means being provided for sealingly pressing said cover strips against side wall portions of said other member and against additional strips respectively located in lateral grooves of said sealing slides.
  • Rotary piston machines operating as displacer pumps or as displacer motors have pressure chambers which are separated from each other by sealing strips. These sealing strips are displaceably guided in pockets in radial or axial direction and by springs or liquid pressure are pressed against the rotary piston. Such pockets are preferably located in the housing of the rotary piston machine. Since the rotary piston is eccentrically mounted or is of a non-round design, it will when rotating bring about a back and forth movement of the sealing strip or slide in said pockets while alternately liquid is pressed out of one pressure chamber or a group of pressure chambers and simultaneously liquid enters the other pressure chamber or pressure chambers. Consequently, a different liquid pressure prevails in two pressure chambers at opposite sides of a sealing slide. It is necessary that the sealing slides effect a proper seal with regard to this difference in pressure.
  • FIG. 1 diagrammatically represents a crosssection through a heretofore known rotary piston machine.
  • FIG. 2 is a section taken along the line IIII of FIG. 1.
  • FIGS. 3, 4 and 5 respectively illustrate three axial sections of portions of a hydrostatic drive with a sealing slide according to the invention, said slide being displaceable in radial direction and being of different design in FIGS. 3, 4 and 5 respectively.
  • FIG. 6 is a section taken along the line VIVI of FIG. 5.
  • FIG. 7 represents an axial section through a portion of a hydrostatic drive with axially displaceable sealing slides according to still another embodiment of the invention.
  • FIG. 8 shows the development of the cylinder of FIG.
  • this rotary piston machine comprises a housing 1 which has a cylindrical opening housing an output shaft 3.
  • a rotary piston 4 is rotatable about the axis 2 of the output shaft 3 while being eccentrically mounted on the latter.
  • the rotary piston 4 is in the shape of a cylinder.
  • the annular gap resulting from the eccentric mounting of the rotary piston and located between the housing 1 and the rotary piston 4 is by means of four sealing slides 5 uniformly subdivided into four pressure chambers 6, 7, 8 and 9.
  • the sealing slides 5 are radially displaceable in pockets 10 of the housing .1.
  • the said sealing slides 5 are pressed against the circumferential surface of the rotary piston 4.
  • the sealing slides are provided with sealing strips as indicated in the lower portion of FIGS. 1 and 2.
  • Such sealing strip 14 is guided in radial direction in a slot of slide 5 which slot is open toward the rotary piston 4.
  • the sealing strip 14 is, for instance, by means of springs 15 pressed against the circumferential surface of the rotary piston 4.
  • the sealing strip 14 extends over the width of the rotary piston 4. This, however, does not yield a satisfactory seal in the critical gaps marked by lines 12 and 13.
  • the present invention is based on a sealing strip construction on a sealing slide which is displaceably guided in a pocket of one of two structural members of a rotary piston machine, for instance the housing or the rotary piston, which are rotatable relative to each other.
  • the said sealing slide has in a slot an end face strip which extends over the elfective width of the rotary piston and which by means of a spring element or the like is pressed against the other structural member.
  • the invention consists primarily in that the gap between said end face strip and the other structural member is on both ends covered by two cover strips which are arranged approximately parallel to the direction of displacement of the sealing slide in grooves of the structural member containing the pocket.
  • the said cover strips are by means of a spring element or the like pressed against the lateral surfaces of the other structural element, against the end surfaces of the face strip and against two leg strips which are located on both sides of the sealing slide in grooves substantially parallel to the direction of displacement of the sealing slide.
  • the invention may be used for instance in connection with hydrostatic drives as disclosed for instance in US. Patent 3,066,476 and, more specifically, with radial as well as with axial guiding of the sealing slide. If desired, the sealing slide may also be guided in pockets of the rotary structural member instead of in pockets of the housing.
  • the hydrostatic drive shown in these figures has a housing 20 with a rotary piston 21 therein, said rotary piston having an oval profile.
  • the lateral surfaces 22 of the hydrostatic drive form together with the lateral surfaces 23 of the housing opening very narrow gaps.
  • the housing 20 has pockets 24 uniformly distributed over the circumference of its opening, only one pocket 24 being shown.
  • Each pocket 24 has radially displaceably guided therein a sealing slide 25.
  • the small lateral surfaces 26 of said sealing slide 25 form together with the narrow inner surfaces 27 of pocket 24 very narrow gaps of for instance a few hundredth of a millimeter.
  • narrow gaps are formed between the wide lateral surfaces of the sealing slide 25 and the wide inner surfaces of the pockets 24.
  • the slide 25 is provided with a strip 28 which corresponds to the strip 14 in FIGS. 1 and 2.
  • This strip 28 is guided in a slot 29 of slide 25 which slot is open toward the rotary piston 21.
  • springs 30 the strip 28 is pressed against the circumferential surface of the rotary piston 21.
  • the length of the strip 28 substantially equals the width of the rotary piston 21. Consequently, the end faces 31 of strip 28 are located in the same planes as the lateral surfaces 22 of the rotary piston.
  • grooves 32 which extend parallel to the direction of displacement of the sealing slide 25 and which toward the housing opening and in part toward the pocket 24 are open.
  • Cover strips 33 are provided in grooves 32 and by means of springs 34 are pressed against the lateral surfaces 22 of the rotary piston 21 and against the end faces 31 of the strip 28. Furthermore, the cover strips 33 have those portions thereof which extend into pockets 24 in engagement with two leg strips 35 which are arranged in grooves 36 of the sealing slide 25 in parallel arrangement to the direction of displacement of slide 25 while being pressed by springs 37 against the cover strips 33.
  • the cover strips 33 cover the gap between the strip 28 and the rotary piston 21.
  • a sutficient seal is obtained not only by the strip 28 within the area of the circumferential surface of the rotary piston 21 but also at both sides of said piston 21. Consequently, no material quantity of liquid can pass from one of the pressure chambers on either side of the slide 25 to the other pressure chambers along the surfaces 31 of the strip 28. Since, according to this embodiment, each of the sealing strips 28, 33, 35 is individually displaceable transverse to its engaging surface, the sealing strips will accomplish their purpose also when the engaging surfaces have worn.
  • all sealing strips 28, 33, 35 have engaging surfaces of the same width.
  • FIG. 3 shows the sealing slide 25 in a posittion in which it is moved out farthest of the pocket 24 while the length a of the engaging surfaces between the rotary piston 21 and the cover strip 33 is shortest during a revolution of the rotary piston.
  • the distance a is so short with regard to the total length of the cover strips 33 that the ends of the cover strips which protrude beyond the rotary piston 21 and the strip 28 will tilt in the direction toward the slide 25 in which instance the springs 37 will not offer sufiicient resistance to the pressure pressing the strip 35 into the groove 36.
  • the springs 37 will not offer sufiicient resistance to the pressure pressing the strip 35 into the groove 36.
  • FIGS. 5 and 6 Another possibility of preventing the above mentioned tilting of the cover strips is illustrated in FIGS. 5 and 6.
  • the leg strips 35 are again separated from the strips 28 and are arranged in grooves 36 on both sides of the slide 25.
  • the leg strips 38 are of a design which differs from that of the leg strips 35 of FIG. 3. More specifically, the strips 38 have a groove 39 which is open toward the lateral surfaces 27 of the pocket 24.
  • the pocket 24 is at its longitudinal sides and at the transverse side which faces away from the rotary piston 21 surrounded by engaging surfaces by means of which the strip 38 engages the respective side surface 27 and, when the sealing slide has moved out, partly engages the respective side surface 23 of the housing opening.
  • the leg strips 38 have a greater width than the cover strips 33 which latter have the same width as the strips 28.
  • the cover strips 33 extend by means of their portions protruding beyond the piston 21 and strip 28 into the grooves 39 of the strips 38, but only to such an extent that they do not prevent the engagement of the surfaces 27 and 23 by the strips 38.
  • the groove 39 of each leg strip 38 is through bore 41 in communication with that portion of groove 36 which is located on the inner side of the leg strip 38. Therefore, in groove 39 there prevails the same liquid pressure as in groove 36. Furthermore, this liquid pressure is maintained also in the groove 32 receiving the cover strip 33, because this last mentioned groove portion communicates with the groove 39 of strip 38 through a gap 42 which is widened by a slanted portion 43.
  • each cover strip 33 In view of the liquid pressure prevailing in groove 32 of each cover strip 33, the cover strip 33 is pressed against the respective lateral surface 22 of the rotary piston and the end surface 31 of the strips 28 so that no springs are required for this purpose. That portion of each cover strip 33 which protrudes beyond the rotary piston 21 and the end strip 28 is in view of the above mentioned connection between groove 39 and groove 32 at its sides which are located opposite to each other acted upon the same liquid pressure. Consequently, that portion of each cover strip 33 which protrudes beyond the rotary piston 21 and the end strip 28 is not acted upon by a force transverse to said cover strip 33. Consequently, the cover strips 33 are not subjected to any tilting moments so that a proper engagement of the lateral surfaces 22 of the rotary piston and the end faces 31 of the strip 28 by the cover strips 33 will be assured.
  • each leg strip 38 ends in the direction toward the rotary piston 21 in a slot by means of which the leg strip 38 extends over the strip 28.
  • the rotary piston is formed by two discs 51 mounted on a shaft 50 and by annular bodies 52 arranged on said discs 51. These annular bodies 52 move tightly in annular recesses of the housing 54 while a web 55 of the housing is located between said annular recesses.
  • the annular bodies 52 have two equidistant wave-like surfaces 56 engaged by sealing strips 57 which are axially displaceably guided in continuous recesses in web 55 and form pressure chambers 58.
  • Each sealing slide 57 is sealed with regard to each of the two wave-shaped surfaces 56 and on both sides with'regard to the housing by means of a strip 28 and two leg strips 35.
  • the leg strips 35 are united for instance according to the embodiment of FIG. 4 so as to form a U-shaped sealing strip.
  • the leg strips 35 are similar to the embodiment of FIG. 4 in engagement with cover strips 33 which are arranged in grooves 56 of the housing 54 in parallel relationship to the direction of displacement of the sealing slide and are by springs or liquid pressure pressed against the lateral surfaces of the rotating annular bodies 52. In this way, similar to the other embodiments referred to above, the required seal of all critical gaps will be assured.
  • a rotary piston machine which includes: a first member forming a housing, a second member at least partially arranged within said first member and forming a piston, said first and second members being rotatable relative to each other while defining with each other a gap varying in the course of a relative rotation of said members with regard to each other, one of said members being provided with a plurality of first recess means, a plurality of sealing slide means respectively extending into said gap and reciprocable in said first recess means in response to a relative rotary movement of said first and second members with regard to each other, each of said sealing slide means including a first sealing strip in sealing engagement with the surface faced thereby and pertaining to the other member to sealingly subdivide said gap into a plurality of chambers, each of said sealing slide means having its lateral end faces provided with second recess means extending in the direction of the respective sealing slide means containing said second recess means, second sealing strips respectively arranged in said second recess means, that one of said members which is provided with said first reces

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Hydraulic Motors (AREA)
  • Compressor (AREA)
  • Actuator (AREA)
US755644A 1967-09-02 1968-08-27 Sealing strip Expired - Lifetime US3552894A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19671576896 DE1576896A1 (de) 1967-09-02 1967-09-02 Dichtleisten-Konstruktion

Publications (1)

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US3552894A true US3552894A (en) 1971-01-05

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ID=5678931

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Application Number Title Priority Date Filing Date
US755644A Expired - Lifetime US3552894A (en) 1967-09-02 1968-08-27 Sealing strip

Country Status (11)

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US (1) US3552894A (es)
BE (1) BE720279A (es)
CH (1) CH496879A (es)
DE (1) DE1576896A1 (es)
DK (1) DK123314B (es)
ES (1) ES357571A1 (es)
FR (1) FR1577182A (es)
GB (1) GB1191426A (es)
IE (1) IE32297B1 (es)
NL (1) NL6811804A (es)
NO (1) NO120196B (es)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3809024A (en) * 1972-08-14 1974-05-07 H Abbey Four-stroke and two-stroke rotary internal combustion engine

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1983003874A1 (en) * 1982-04-26 1983-11-10 Ivor John Pearce Rotary engines and pumps
CN105736363A (zh) * 2016-04-06 2016-07-06 禾通科技公司 一种偏心轮结构的容积泵

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3809024A (en) * 1972-08-14 1974-05-07 H Abbey Four-stroke and two-stroke rotary internal combustion engine

Also Published As

Publication number Publication date
DE1576896A1 (de) 1970-05-06
CH496879A (de) 1970-09-30
FR1577182A (es) 1969-08-01
DK123314B (da) 1972-06-05
NL6811804A (es) 1969-03-04
IE32297L (en) 1969-03-02
GB1191426A (en) 1970-05-13
ES357571A1 (es) 1970-03-16
IE32297B1 (en) 1973-06-13
NO120196B (es) 1970-09-14
BE720279A (es) 1969-02-17

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