US3829252A - Sealing arrangement for an air compressor - Google Patents

Sealing arrangement for an air compressor Download PDF

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Publication number
US3829252A
US3829252A US00235999A US23599972A US3829252A US 3829252 A US3829252 A US 3829252A US 00235999 A US00235999 A US 00235999A US 23599972 A US23599972 A US 23599972A US 3829252 A US3829252 A US 3829252A
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US
United States
Prior art keywords
seal
air compressor
sealing member
rotor
peripheral seal
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
US00235999A
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English (en)
Inventor
M Nakano
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.)
Kawasaki Heavy Industries Ltd
Kawasaki Motors Ltd
Original Assignee
Kawasaki Heavy Industries Ltd
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
Priority claimed from JP1917171U external-priority patent/JPS5257451Y2/ja
Priority claimed from JP11578171U external-priority patent/JPS5314963Y2/ja
Application filed by Kawasaki Heavy Industries Ltd filed Critical Kawasaki Heavy Industries Ltd
Application granted granted Critical
Publication of US3829252A publication Critical patent/US3829252A/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
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C21/00—Oscillating-piston pumps specially adapted for elastic fluids
    • F04C21/002—Oscillating-piston pumps specially adapted for elastic fluids the piston oscillating around a fixed axis
    • 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
    • F04C27/00—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
    • F04C27/007—Sealings for working fluid between radially and axially moving parts

Definitions

  • ABSTRACT Vanes of an air compressor rotor are provided with end seals and an axially extending peripheral seal.
  • a cylindrical sealing member is positioned at the radially innermost end of each end seal to engage therewith.
  • the cylindrical sealing member and the end seals are urged outwardly by springs.
  • the end seals extend radially outwardly to the outer periphery of the peripheral seal to seal the outer ends of the peripheral seal which normally'has a tolerance to allow for thermal expansion.
  • the rotor with vanes thereon is rotatably supported by bearings which are located outside of the rotor cylinder and are hermetically sealed and lubricated.
  • bearings which are located outside of the rotor cylinder and are hermetically sealed and lubricated.
  • the sealing material for the seals is a material having a selflubrication effect, such as carbon, TFE (tetrafluoroethylene), and the like, so that the air compressor can be used without oil lubrication of the seals.
  • FIGS. 1 and 2 show crossectional and longitudinal partial sectional views of conventional prior art air compressors of the type described.
  • Such compressors have a rotor l with vanes 2, 2 having grooves 2a in their outer peripheral surface and grooves 2b in their end surfaces for accepting a peripheral seal 3 and end seals 4.
  • a wave shaped spring biases the end seals axially outward.
  • peripheral seal 3 varies in its length according to the variation in temperature within the cylinder. When the gas is compressed, the temperature rises; and although the cylinder is cooled by cooling water in passage 10a in the cylinder wall, the rotor l is heated to a high temperature so that thermal expansion of the seals cannot be ignored.
  • the expansion of seal 4 can be accommodated by space 40. Expansion of peripheral seal 3 cannot be accommodated unless a tolerance or space is allowed.
  • peripheral seal 3 since it has a comparatively large length, has a corresponding thermal expansion which requires that a tolerance space 30 be provided at opposite ends thereof.
  • the seal 3 is made of TFE or similar high molecular compound
  • thermal expansion is quite significant; i.e., about 20 to 30 times as great as that of the metallic material of the cylinder and rotor. Therefore, a clearance 30 having a dimension S as shown in FIG. 2, is required in order to accommodate thermal expansion of the peripheral seal 3.'Clearance space 30 also causes leakage of air from one chamber to another of the cylinder and adversely affects the performance of e compressor.
  • This invention provides a sealing arrangement for air compressors of the known type in which the thermal expansion is accommodated while leakage is prevented and wear of the seals is accommodated while leakage is prevented.
  • the sealing arrangement of this invention can easily be incorporated in a conventional air compressor and is quite simple in construction.
  • the seal maintains high performance of the compressor over a long period of time and enables the use of a high molecular compound such as TFE for the sealing material, which compound would ordinarily be difficult to use due to its great thermal expansion, but has other beneficial properties, such as high abrasion resistance, high chemical resistance, self-lubrication effect, and a generally desirable performance as a sealing material.
  • FIGS. 1 and 2 show, as mentioned above, a transverse sectional view and a partial longitudinal sectional view of a prior art air compressor with seals which are improved by the sealing arrangement of the present invention
  • FIG. 3 is an end view of a air compressor rotor with vanes and seals in accordance with a first embodiment of this invention
  • FIG. 4 is a partial side view of the rotor with vanes as shown in FIG. 3 partly broken away in section;
  • FIG. 5 is a perspective view of a slotted cylindrical sealing member employed in the first embodiment of the invention as shown in FIGS. 3 and 4;
  • FIG. 6 is an end view of a rotor with vanes in accordance with a second embodiment of this invention.
  • FIG. 7 is a partial side view of the rotor with vanes shown in FIG. 6 partially broken away in section;
  • FIG. 8 is a perspective view of a cylindrical tongued sealing member employed in the second embodiment of the invention shown in FIGS. 6 and 7;
  • FIG. 9 is a partial side elevation of a rotor with vanes partly broken away and shown in longitudinal section in accordance with the first embodiment of this invention illustrated in FIGS. 3-5;
  • FIG. 10 is an end view of a rotor with vanes partially cut away in accordance with a third embodiment of this invention.
  • FIG. 11 is a partial side elevation of the rotor with vanes of FIG. 10 partially broken away in longitudinal section;
  • FIG. 12 is a partial top plan view of the rotor vane shown in FIGS. 10 and 11;
  • FIG. 13 is an end view of a rotor with vanes partially broken away and illustrating a fourth embodiment of this invention.
  • FIG. 14 is a partial side elevation view of the rotor with vanes of FIG. 13 partially broken away in longitudinal section;
  • FIG. 15 is a partial top view of the vane of the rotor as shown in FIGS. 13 and 14.
  • FIGS. 3-5 illustrate a first embodiment of the present invention utilizing an additional seal in the form of a cylindrical sealing member 61 having a slot or groove 71 provided therein which is accommodated in a circular blind hole axially bored in the end of vane 21.
  • a compression spring 81 is disposed in the hole for urging the sealing member 61 outwardly.
  • An end seal 41 is mounted on the end of vane 21 and is slidable radially and urged axially outward by spring 51. The radially innermost end of seal 41 is contained within groove or slot 71 in solid cylindrical sealing member 61, as shown in FIGS. 3 and 4.
  • FIGS. 3 and 4 The outer periphery of sealing member 61 contacts the outer surface of the shaft 11 of rotor 1, as shown in FIGS. 3 and 4. All other portions of the rotor vanes and seals of the FIGS. 3-5 embodiment including the peripheral seal 31 are of the same construction as a conventional prior art air compressor rotor vane and seal assembly.
  • FIG. 9 shows the complete assembly of the FIGS. 3-5 embodiment.
  • end seal 41 wears or the end of seal 61 wears, it will still be kept in contact with the end of the cylinder by the urging of springs 51 and 81. Moreover, when the outer surface of the peripheral seal 31 wears and end seal 41 moves radially outward by centrifugal force, there will still be no leakage or clearance space between the radially innermost end of seal 41 and the shaft 11 because of additional sealing member 61 and the fact that the sides of the end of end seal 41 are in contact with the groove or slot 71 in seal member 61. Seal member 61 cannot move radially since it is contained within a complementary hole in vane 21.
  • FIGS. 6-8 A second embodiment of this invention is shown in FIGS. 6-8.
  • a cylindrical sealing member 62 having a tongue 72 formed by a pair of cutaway portions 62a; and this seal 62 is inserted into a circular hole in the vane 22 in the same manner that plug 61 was inserted in hole in vane 21.
  • the periphery of the shaft 11 is in contact with the periphery of the seal 62.
  • a compression spring 82 urges the seal 62 axially outward.
  • the end seal is two sealing pieces 42, 42 mounted in side-by-side parallel relation and radially slidable with their radially innermost ends in contact with the sides of tongue 72.
  • a spring 52 urges each seal 42 axially outwardly.
  • the peripheral seal is also made up of two sealing pieces 32, 32 in alignment with the end seals 42, 42.
  • the operation is similar to the FIGS. 46 embodiment in that tongue 72 serves together with end seals 42 to preclude leakage under the radially .innermost end of seals 42 even when the outer surface'of peripheral seals 32 wears and end seals 42 move radially outward.
  • the first two embodiments prevent leakage at the ends of the rotor adjacent the rotor shaft (i.e., adjacent the radially innermost end of the end seal); and this accomodates the wear of the peripheral seal.
  • leakage at the ends of the peripheral seal i.e., at the radially outermost ends of the end seal
  • this leakage has not been considered or taken into consideration.
  • FIGS. 10-12 A third embodiment of this invention is shown in FIGS. 10-12.
  • a cylindrical member 63 having a slot 73 therein is similar to the seal shown in FIG. 5 and is inserted into a blind circular hole in vane 23.
  • a spring 53 urges end seal 43 outwardly
  • a spring 83 urges seal member 63 outwardly as in the first two embodiments.
  • the end seal 43 in this embodiment overlaps the ends of the peripheral seals 33, as shown in FIGS. 10 and 12.
  • the peripheral seal 33 is a pair of sealing pieces 33 and 33 which are mounted parallel to one another so that the side surfaces contact side surfaces of end seal 43.
  • the radially outermost end of end seal 43 extends outwardly to the outermost surface of peripheral seal 33, as shown in FIGS. 10 and 11.
  • the ends of peripheral seal pieces 33, 33 are less than the length of the cylinder by a clearance dimension S shown in FIGS. 11 and 12 to allow for thermal expansion.
  • FIGS. 13-15 A fourth embodiment of this invention is illustrated in FIGS. 13-15.
  • the fourth embodiment is similar to the third embodiment, except there is a single peripheral seal 34 and a pair of end seals 44 sandwiching the peripheral seal between the radially outermost ends and sandwiching the tongue 64a of seal 64 between the sides of the radially innermost ends.
  • the end seals 44 again overlap the necessary clearance space S allowing for thermal expansion of the peripheral seal 34.
  • the cylindrical seal 64 is identical to seal 62 of the second embodiment.
  • the fourth embodiment is a combination of the second embodiment and a reversal of the third embodiment; and the third embodiment is a combination of the first embodiment with additional peripheral seals straddling the end seal to prevent leakage at the ends of the peripheral seal.
  • leakage is prevented, not only at the space between the radially innermost ends of the end seal and the rotor shaft, but also at the radially outermost ends of the end seal or ends of the peripheral seal; and accommodation for both wear and thermal expansion of the peripheral seal is provided.
  • a sealing arrangement for an air compressor of the oscillating-vane type having a vaned rotor provided with end seals and a peripheral seal on each vane, the rotor being on an axial shaft concentric with an outer housing, the improvements in the sealing arrangement:
  • a sealing member accommodated by a hole in each end of the vane adjacent the axial shaft of the rotor, the hole preventing the sealing member from moving in any direction except axially and the hole contacting the periphery of the rotor shaft;
  • a spring means in the hole for urging the sealing member axially outward, the radially inner end of the end seal contacting the sealing member in air tight engagement in either circumferential direc 6 tion and the end seals being movable relative to the sealing member in a radial direction to accommodate wear of the peripheral seal without allowing leakage between the radially innermost ends of the end seal and the rotor shaft.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Compressor (AREA)
  • Seal Device For Vehicle (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
US00235999A 1971-03-20 1972-03-20 Sealing arrangement for an air compressor Expired - Lifetime US3829252A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1917171U JPS5257451Y2 (de) 1971-03-20 1971-03-20
JP11578171U JPS5314963Y2 (de) 1971-12-09 1971-12-09

Publications (1)

Publication Number Publication Date
US3829252A true US3829252A (en) 1974-08-13

Family

ID=26356002

Family Applications (1)

Application Number Title Priority Date Filing Date
US00235999A Expired - Lifetime US3829252A (en) 1971-03-20 1972-03-20 Sealing arrangement for an air compressor

Country Status (10)

Country Link
US (1) US3829252A (de)
BE (1) BE780936A (de)
CH (1) CH549730A (de)
DE (1) DE2213504C2 (de)
FR (1) FR2131478A5 (de)
GB (1) GB1358632A (de)
IT (1) IT960774B (de)
NL (1) NL7203698A (de)
NO (1) NO139837C (de)
SE (1) SE381713B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3936250A (en) * 1974-07-10 1976-02-03 General Motors Corporation Corner seal coil spring arrangement for rotary engine
US4155685A (en) * 1976-07-14 1979-05-22 Eiichi Kunieda Gas seal arrangement between rotor and housing
JP2009523951A (ja) * 2006-01-17 2009-06-25 ステード，クリスチアーン，フィリップス フォン シール装置
US20110176947A1 (en) * 2005-03-09 2011-07-21 Fibonacci International, Inc. Rotary engine vane cap apparatus and method of operation therefor

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2366453A1 (fr) * 1977-07-08 1978-04-28 Kunieda Eiichi Dispositif d'etancheite au gaz
CN113883055B (zh) * 2021-11-19 2025-03-21 浙江百达精工股份有限公司 旋转式空调压缩机

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1566355A (en) * 1925-01-02 1925-12-22 Henry M Sunnes Packing for pumps
DE1151993B (de) * 1961-03-25 1963-07-25 Nsu Motorenwerke Ag Radialdichtung fuer Rotationskolbenmaschinen
FR1299714A (fr) * 1961-06-16 1962-07-27 Appareil pouvant constituer un compresseur ou une pompe, un moteur à vapeur, à air comprimé ou à explosion
JPS4218644Y1 (de) * 1965-03-11 1967-10-28
US3485217A (en) * 1967-10-03 1969-12-23 Outboard Marine Corp Apex seal for rotary combustion engine
US3485440A (en) * 1968-01-29 1969-12-23 Chrysler Corp Sealing apparatus for rotary mechanism

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3936250A (en) * 1974-07-10 1976-02-03 General Motors Corporation Corner seal coil spring arrangement for rotary engine
US4155685A (en) * 1976-07-14 1979-05-22 Eiichi Kunieda Gas seal arrangement between rotor and housing
US20110176947A1 (en) * 2005-03-09 2011-07-21 Fibonacci International, Inc. Rotary engine vane cap apparatus and method of operation therefor
US8689765B2 (en) * 2005-03-09 2014-04-08 Merton W. Pekrul Rotary engine vane cap apparatus and method of operation therefor
JP2009523951A (ja) * 2006-01-17 2009-06-25 ステード，クリスチアーン，フィリップス フォン シール装置
US20090315270A1 (en) * 2006-01-17 2009-12-24 Christiaan Philippus Von Stade Seal Arrangement

Also Published As

Publication number Publication date
CH549730A (de) 1974-05-31
NL7203698A (de) 1972-09-22
SE381713B (sv) 1975-12-15
BE780936A (fr) 1972-07-17
IT960774B (it) 1973-11-30
FR2131478A5 (de) 1972-11-10
GB1358632A (en) 1974-07-03
NO139837B (no) 1979-02-05
DE2213504A1 (de) 1972-10-26
DE2213504C2 (de) 1984-12-06
NO139837C (no) 1979-05-16

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