US20030138332A1 - Sealing material for use in seal member in compressor and compressor inculuding the same - Google Patents

Sealing material for use in seal member in compressor and compressor inculuding the same Download PDF

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Publication number
US20030138332A1
US20030138332A1 US10/318,839 US31883902A US2003138332A1 US 20030138332 A1 US20030138332 A1 US 20030138332A1 US 31883902 A US31883902 A US 31883902A US 2003138332 A1 US2003138332 A1 US 2003138332A1
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Prior art keywords
weight
parts
approximately
sealing material
polymer mixture
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US10/318,839
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Inventor
Masami Osako
Takeshi Yamada
Takayuki Kato
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Toyota Industries Corp
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Toyota Industries Corp
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Assigned to KABUSHIKI KAISHA TOYOTA JIDOSHOKKI reassignment KABUSHIKI KAISHA TOYOTA JIDOSHOKKI ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KATO, TAKAYUKI, OSAKO, MASAMI, YAMADA, TAKESHI
Publication of US20030138332A1 publication Critical patent/US20030138332A1/en
Abandoned legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
    • F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
    • F04B27/10—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
    • F04B27/1036—Component parts, details, e.g. sealings, lubrication
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
    • C08L9/02—Copolymers with acrylonitrile
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K3/00—Materials not provided for elsewhere
    • C09K3/10—Materials in mouldable or extrudable form for sealing or packing joints or covers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
    • F16J15/3216—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip supported in a direction parallel to the surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
    • F16J15/3232—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3284—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings characterised by their structure; Selection of materials
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/16—Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers

Definitions

  • the present invention generally relates to sealing material for use in a seal member in a compressor that compresses refrigerant containing carbon dioxide gas.
  • a seal member In order to keep pressure and to seal refrigerant in an air conditioning system and in devices that are arranged in the air conditioning system, a seal member is used in a refrigerating machine.
  • Acrylonitrile-butadiene rubber (NBR) series polymer (NBR or hydrogenated NBR) includes mainly NBR and is contained in sealing material for the seal member.
  • NBR and hydrogenated NBR have excellent thermal resistance, oil resistance, water resistance and abrasion quality and is suitable for the sealing material.
  • NBR series polymer contains bound acrylonitrile. As bound acrylonitrile content is increased, gas permeability of NBR series polymer decreases and sealing performance of NBR series polymer improves. On the other hand, as bound acrylonitrile content is increased, the usability of NBR series polymer deteriorates at a relatively low temperature. As disclosed in Japanese Unexamined Patent Publication No. 8-217919, NBR series polymer contains low bound acrylonitrile content in a conventional sealing material. Although the above deterioration is generally suppressed due to the low bound acrylonitrile content, there is some limitation in improving the sealing performance of the conventional sealing material.
  • the present invention provides a sealing material that has excellent sealing performance and thermal properties for use in the seal member in the compressor that compresses refrigerant including carbon dioxide gas, while the usability of the sealing material at a relatively low temperature is maintained.
  • a sealing material is used in a seal member for the compressor that compresses refrigerant including carbon dioxide gas.
  • the sealing material has a polymer mixture.
  • the polymer mixture includes an acrylonitrile-butadiene rubber series polymer containing approximately 45% or more by weight of bound acrylonitrile.
  • the present invention is applicable to a compressor.
  • the compressor includes a housing, a rotary shaft and a compression mechanism.
  • the rotary shaft is supported by the housing.
  • the compression member is located in the housing for compressing refrigerant that contains carbon dioxide gas.
  • the compression mechanism is driven by the rotary shaft.
  • the compressor also has a seal member.
  • the seal member is provided in the housing for sealing the refrigerant in the housing and has a sealing material.
  • the sealing material includes a polymer mixture.
  • the polymer mixture includes an acrylonitrile-butadiene rubber series polymer containing approximately 45% or more by weight of bound acrylonitrile.
  • FIG. 1 is a cross sectional view of a variable displacement type compressor of a preferred embodiment according to the present invention
  • FIG. 2 is a partially enlarged view of the shaft sealing mechanism shown in FIG. 1;
  • FIG. 3 shows compositions and physical test results of vulcanized products of examples 1 through 3 and comparative examples 1 and 2;
  • FIG. 4 shows a relationship between carbon dioxide gas permeability coefficients and bound acrylonitrile content contained in hydrogenated acrylonitrile-butadiene rubber (NBR); and
  • FIG. 5 is a graph showing relationships of compression set and carbon dioxide gas permeability coefficient with respect to weight percentage of ethylene-propylene-diene terpolymer rubber (EPDM) in polymer mixtures of the examples 1 through 3 and the comparative example 1.
  • EPDM ethylene-propylene-diene terpolymer rubber
  • FIGS. 1 through 5 A sealing material according to a preferred embodiment of the present invention will be described by referring to FIGS. 1 through 5.
  • refrigerant seal will be described with respect to a shaft sealing mechanism for a variable displacement type compressor 100 .
  • the left side and the right side respectively correspond to the front side and the rear side.
  • the compressor 100 includes a cylinder block 1 , a front housing 2 and a rear housing 5 .
  • the front housing 2 is fixed to the front side of the cylinder block 1 .
  • the rear housing 5 is fixed to the rear side of the cylinder block 1 .
  • a valve plate assembly 6 is interposed between the rear housing 5 and the cylinder block 1 .
  • the rear housing 5 and the valve plate assembly 6 define a suction chamber 3 and a discharge chamber 4 .
  • Carbon dioxide refrigerant gas which mainly contains carbon dioxide gas, is introduced into the suction chamber 3 and is compressed. The compressed carbon dioxide refrigerant gas is discharged into the discharge chamber 4 .
  • a suction port 3 b is formed in the valve plate assembly 6 and interconnects the suction chamber 3 with a cylinder bore 1 a that is formed in the cylinder block 1 .
  • a discharge port 4 b is also formed in the valve plate assembly 6 and interconnects the discharge chamber 4 with the cylinder bore 1 a .
  • a bleed passage 16 is formed in the valve plate assembly 6 and interconnects the suction chamber 3 with a crank chamber 9 that is defined by the cylinder block 1 and the front housing 2 .
  • a drive shaft 8 or a rotary shaft is inserted through the cylinder block 1 and the front housing 2 .
  • the drive shaft 8 is rotatably supported by the cylinder block 1 and the front housing 2 through bearing mechanisms that are arranged in the cylinder block 1 and the front housing 2 .
  • the drive shaft 8 is directly coupled to a vehicle engine without a clutch mechanism. Although the vehicle engine is not shown in FIG. 1, it functions as an external driving source.
  • the drive shaft 8 is driven by the rotation of the vehicle engine.
  • the rotation of the drive shaft 8 drives a compression mechanism including a piston 15 as will be described later.
  • a disc-shaped rotary swash plate 11 is accommodated in the crank chamber 9 .
  • a through hole 12 is formed substantially at the center of the swash plate 11 .
  • the drive shaft 8 is inserted through the shaft hole 12 .
  • a pair of pins 13 is fixed to the front side of the swash plate 11 .
  • Each of the pins 13 has a substantially spherical portion 13 a at its top end.
  • a rotor 30 is secured to the drive shaft 8 and is integrally rotated with the drive shaft 8 .
  • the rotor 30 has a disc-shaped lug plate 31 , a pair of support arms 32 and a balance weight 33 .
  • a through hole 30 a is formed in the lug plate 31 , and the drive shaft 8 is inserted through the through hole 30 a.
  • the rotor 30 is connected with the swash plate 11 through a hinge mechanism 20 .
  • the support arms 32 of the rotor 30 respectively engage with the pins 13 on the side of the swash plate 11 , thereby, constituting the hinge mechanism 20
  • Each of the support arms 32 has a support hole 32 a whose shape corresponds to the spherical portion 13 a of the pin 13 .
  • the spherical portion 13 a is inserted into the support hole 32 a . In this state, the support arm 32 supports the pin 13 while the pin 13 is slidable with respect to the support hole 32 a .
  • the hinge mechanism 20 transmits the rotating torque of the drive shaft 8 to the swash plate 11 and allows the swash plate 11 to incline with respect to a rotary axis L of the drive shaft 8 .
  • the swash plate 11 is slidable and inclinable with respect to the drive shaft 8 .
  • a plurality of the cylinder bores 1 a is circumferentially disposed in the cylinder block 1 at a regular interval.
  • the piston 15 is slidably inserted into each of the cylinder bores 1 a .
  • Each of the pistons 15 is connected to the swash plate 11 through a pair of shoes 14 at the front side of the piston 15 .
  • the rotational movement of the swash plate 11 is converted into the reciprocating movement of the piston 15 in the corresponding cylinder bore 1 a while the swash plate 11 is rotated in accordance with the rotation of the drive shaft 8 .
  • the carbon dioxide refrigerant gas is introduced into the cylinder bores 1 a from the suction chamber 3 and is compressed.
  • the compressed carbon dioxide refrigerant gas is discharged from the cylinder bores 1 a to the discharge chamber 4 .
  • a thrust bearing 40 is interposed between the rotor 30 and the front housing 2 and is in contact with the front side of the lug plate 31 .
  • the front housing 2 receives compression reactive force, which is generated in compressing the carbon dioxide refrigerant gas by the piston 15 .
  • the compression reactive force travels through the piston 15 , the shoes 14 , the swash plate 11 , the hinge mechanism 20 and the thrust bearing 40 .
  • Displacement of the compressor 100 is determined by stroke of the piston 15 or a distance between the top dead center and the bottom dead center of the piston 15 .
  • the stroke of the piston 15 is determined by an inclination angle ⁇ of the swash plate 11 with respect to the rotary axis L of the drive shaft 8 . Namely, as the inclination angle ⁇ of the swash plate 11 becomes large, the stroke of the piston 15 and the discharge amount of the carbon dioxide refrigerant gas also become large. On the other hand, as the inclination angle ⁇ of the swash plate 11 becomes small, the stroke of the piston 15 and the discharge amount of the carbon dioxide refrigerant gas become small.
  • the inclination angle ⁇ of the swash plate 11 is determined by pressure differential between the cylinder bores 1 a and the crank chamber 9 .
  • the above pressure differential is regulated by a displacement control valve 18 .
  • the inclination angle ⁇ of the swash plate 11 is at the largest angle. Namely, in the above state, the displacement of the compressor 100 is the largest, and load on the compressor 100 is relatively high. In contrast, when the load on the compressor 100 is relatively low, the swash plate 11 is located at a position indicated by the two-dot chain line as shown in FIG. 1.
  • a supply passage 17 is formed in the cylinder block 1 and the rear housing 5 and connects the discharge chamber 4 with the crank chamber 9 .
  • the displacement control valve 18 is located on the supply passage 17 .
  • the displacement control valve 18 is an electromagnetic valve and adjusts the opening degree of the supply passage 17 .
  • the pressure in the crank chamber 9 is varied by adjusting the opening degree of the supply passage 17 .
  • the pressure differential between the cylinder bores 1 a and the crank chamber 9 is regulated.
  • the inclination angle of the swash plate 11 is varied, and the stroke of the piston 15 is varied.
  • the displacement of the compressor 100 is regulated.
  • polyalkylene glycol (PAG) as a refrigerating machine oil is mixed with the carbon dioxide refrigerant gas.
  • a shaft sealing mechanism 50 is located in the front housing 2 for sealing the drive shaft 8 .
  • the shaft sealing mechanism 50 is interposed between the front housing 2 and the drive shaft 8 .
  • the shaft sealing mechanism 50 includes first and second lip seals 51 and 55 as well as first and second metal retainers 56 and 57 .
  • the first and second lip seals 51 and 55 are in contact with the circumferential surface 8 a of the drive shaft 8 .
  • the first lip seal 51 is made of the sealing material mainly containing hydrogenated acrylonitrile-butadiene rubber (NBR) as will be further described later.
  • the first lip seal 51 has a fixed portion 52 and a movable portion 53 that extends from the fixed portion 52 .
  • the second lip seal 55 is made of resin and is interposed between the first lip seal 51 and the second metal retainer 57 .
  • the first metal retainer 56 holds the first lip seal 51
  • the second metal retainer 57 holds the second lip seal 55
  • a seal chamber 58 is formed between the front housing 2 and the drive shaft 8 at the outer circumferential surface side of the first lip seal 51 and communicates with the crank chamber 9 . Therefore, the first lip seal 51 experiences the pressure in the crank chamber 9 .
  • the first and second lip seals 51 and 55 Before the shaft sealing mechanism 50 is mounted around the drive shaft 8 or the first and second lip seals 51 and 55 are placed against the circumferential surface 8 a of the drive shaft 8 , the first and second lip seals 51 and 55 have the shapes indicated by the two-dot chain line as shown in FIG. 2. After the shaft sealing mechanism 50 is mounted around the drive shaft 8 , the first and second lip seals 51 and 55 are radially pressed by the circumferential surface 8 a of the drive shaft 8 have the shapes indicated by the solid line as shown in FIG. 2. In the above-mounted state, elastic forces of the first and second lip seals 51 and 55 are applied to the circumferential surface 8 a of the drive shaft 8 .
  • the above elastic force towards the circumferential surface 8 a of the drive shaft 8 generates sealing function and prevents the carbon dioxide refrigerant gas from leaking from the crank chamber 9 to the outside of the compressor 100 along the circumferential surface 8 a of the drive shaft 8 .
  • a vulcanized product is used as the sealing material for the first lip seal 51 for the compressor 100 according to the preferred embodiment of the present invention.
  • the composition of the vulcanized product and the physical test results will be described by referring to FIGS. 3 through 5.
  • the composition includes hydrogenated NBR that is one of acrylonitrile-butadiene rubber (NBR) series polymer, ethylene-propylene-diene terpolymer rubber (EPDM), carbon black as reinforcing inorganic filler, zinc oxide, organic peroxide, and antioxidant in examples 1 through 3 and comparative examples 1 and 2.
  • NBR acrylonitrile-butadiene rubber
  • EPDM ethylene-propylene-diene terpolymer rubber
  • carbon black as reinforcing inorganic filler
  • zinc oxide zinc oxide
  • organic peroxide and antioxidant
  • (A-1) Hydrogenated NBR for examples 1 through 3 and comparative example 1 Zetpol 0020 (commercial name) commercially available from Nippon Zeon Co., Ltd., and having a bound acrylonitrile content of 49.2% and a specific gravity of 1.00;
  • (A-2) Hydrogenated NBR for comparative example 2 Zetpol 2020 (commercial name) commercially available from Nippon Zeon Co., Ltd., and having a bound acrylonitrile content of 36.2% and a specific gravity of 0.95;
  • EPDM ENB (commercial name) commercially available from Mitsui chemicals, inc.
  • Hydrogenated NBR contains mainly NBR.
  • EPDM is a polymer that a small amount of non-conjugated diene as cross-linking monomer is copolymerized with ethylene-propylene copolymer (EPM), and unsaturated bond is introduced into EPM.
  • EPM ethylene-propylene copolymer
  • a polymer mixture is composed of hydrogenated NBR and/or EPDM.
  • the polymer mixtures of the examples 1 through 3 each include hydrogenated NBR containing a bound acrylonitrile content of 49.2% by weight.
  • the compositions of the examples 1 through 3 each also include 60 parts by weight of carbon black, 5 parts by weight of zinc oxide, 6 parts by weight of organic peroxide and 1.5 parts by weight of antioxidant per 100 parts by weight of the polymer mixtures. Only the weight percentage of EPDM in the polymer mixture is different among the compositions of the examples 1 through 3.
  • the polymer mixture of the example 1 includes only hydrogenated NBR, not EPDM.
  • the polymer mixture of the example 2 includes 80% by weight of hydrogenated NBR and 20% by weight of EPDM.
  • the polymer mixture of the example 3 includes 60% by weight of hydrogenated NBR and 40% by weight of EPDM.
  • the polymer mixture of the comparative example 1 includes only EPDM.
  • the composition of the comparative example 1 additionally includes 60 parts by weight of carbon black, 5 parts by weight of zinc oxide, 6 parts by weight of organic peroxide, and 1.5 parts by weight of antioxidant per 100 parts by weight of its polymer mixture.
  • the polymer mixture of the comparative example 2 includes only hydrogenated NBR containing a bound acrylonitrile content of 36.2% by weight in its polymer mixture.
  • the composition of the comparative example 2 additionally includes 60 parts by weight of carbon black, 5 parts by weight of zinc oxide, 6 parts by weight of organic peroxide, and 1.5 parts by weight of antioxidant per 100 parts by weight of its polymer mixture.
  • the bound acrylonitrile content in hydrogenated NBR is only different between the compositions of the example 1 and the comparative example 2.
  • a vulcanized product was formed from the compositions, the above mentioned ingredients were kneaded in 8-inch open roll mill at a temperature approximately between 80° C. and 130° C. The mixture was press-cured at a temperature of 180° C. for 6 minutes, and the vulcanized product was formed in a substantially square or circular shape at a thickness of approximately 0.5 mm. The vulcanized product was also produced by the above procedure from the compositions of the comparative examples 1 and 2.
  • a circular sample having a diameter of 25 mm was prepared from each of the vulcanized products.
  • the prepared sample was set in a measuring device for measuring high pressure gas permeability, and the carbon dioxide gas permeability coefficient was measured under a high pressure of 5 MPa. Since the measuring device used in the above measurement is already known, the structural description of the measuring device is omitted.
  • the carbon dioxide gas permeability coefficient was determined according to ASTM D1434.
  • the compression set was measured after each of the vulcanized products was maintained at a temperature of 150° C. for 70 hours.
  • the carbon dioxide gas permeability coefficient of a vulcanized product of the example 1 is 1.79 ⁇ 10 ⁇ 9 cm 3 (STP) ⁇ cm/cm 2 ⁇ sec ⁇ cmHg and is half of that of the vulcanized product of the comparative example 2.
  • STP means standard temperature and pressure.
  • the swelling rate of the vulcanized product of the example 1 for carbon dioxide gas is at the practical use level. Furthermore, although the swelling rate of the vulcanized product of the example 1 for chloro-fluoro-carbon is relatively low, the swelling rate of the vulcanized product of the example 1 for carbon dioxide gas is maintained at the practical use level due to carbon dioxide gas. As a result, although the usability of the vulcanized product of the example 1 at the relatively low temperature is not as high as that of the vulcanized product of the comparative example 2, the usability of the vulcanized product of the example 1 at the relatively low temperature is at the practical use level for carbon dioxide gas.
  • the vulcanized products of the examples 2 and 3 have the compression set respectively of 17.7% and 15% and have relatively-excellent thermal properties.
  • a preferable range of the weight percentage of EPDM is indicated by oblique lines in FIG. 5, and the weight percentage of EPDM in the examples 2 and 3 is in the preferable range.
  • the carbon dioxide gas permeability coefficient in the above preferable range is lower than that of the vulcanized product of the comparative example 2, that is, 3.53 ⁇ 10 ⁇ 9 cm 3 (STP) ⁇ cm/cm 2 ⁇ sec ⁇ cmHg.
  • the compression set in the above preferable range is also lower than that of the vulcanized product in the comparative example 2, that is, 20% Namely, the weight percentage of EPDM in the preferable range is from 5% to 50%. Therefore, when the polymer mixture contains 5% to 50% by weigh of EPDM, the sealing performance of the vulcanized product is substantially compatible with the thermal properties of the vulcanized product.
  • the vulcanized product of the example 1 which includes the hydrogenated NBR (NBR series polymer) containing the bound acrylonitrile of 49.2% by weight, has relatively excellent sealing performance for carbon dioxide gas and is practically usable at the relatively low temperature for carbon dioxide gas It is also confirmed that the vulcanized products of the example 2 and 3 have relatively excellent sealing performance for carbon dioxide and thermal properties. Therefore, the vulcanized products of the examples 1 through 3 are suitably used as the sealing material for the first lip seal 51 in the compressor 100 that compresses the carbon dioxide refrigerant gas.
  • the first lip seal 51 When the vulcanized product of the example 1 is used as the sealing material for the first lip seal 51 , the first lip seal 51 performs relatively excellent sealing performance for carbon dioxide gas and is usable at the relatively low temperature for carbon dioxide gas.
  • the vulcanized product of the example 2 or 3 When the vulcanized product of the example 2 or 3 is used as the sealing material for the first lip seal 51 , the first lip seal 51 performs relatively excellent sealing performance for carbon dioxide gas and has thermal properties. Since the vulcanized products of the examples 1 through 3 include hydrogenated NBR containing a relatively high bound acrylonitrile content, when the vulcanized products are used as sealing material, the sealing performance of the sealing material for the carbon dioxide refrigerant gas is improved. Therefore, the reliability and the durability of the compressor 100 and air conditioning system related to the compressor 100 are improved.
  • the preferred embodiment according to the present invention is applied to the first lip seal 51 , which is widely in contact with the carbon dioxide refrigerant gas, it is effective to obtain excellent sealing performance for the carbon dioxide refrigerant gas.
  • a carbon dioxide gas refrigeration system including a compressor other than shaft seal part of the compressor
  • sealing performance for carbon dioxide gas is ensured by employing a metallic gasket or a gasket having rubber on its surface, or by sealing with metal such as welding.
  • the above seal members cannot seal carbon dioxide gas at the shaft seal part of the compressor.
  • a lip seal made of the sealing material according to the present invention is adopted, the carbon dioxide gas is satisfactorily sealed at the shaft seal part of the compressor. Thereby, a required sealing performance of the carbon dioxide gas refrigeration system is ensured as a whole for carbon dioxide gas.
  • the first lip seal 51 that includes hydrogenated NBR (NBR series polymer) containing the bound acrylonitrile content of 49.2% by weight is used in the above preferred embodiment
  • hydrogenated NBR containing the bound acrylonitrile content of 45% or more by weight which is relatively high nitrile type, is alternatively used.
  • the weight percentage of EPDM is respectively 20% and 40% in the polymer mixture.
  • the weight percentage of EPDM alternatively ranges from 5% to 50%, and the sealing performance is compatible with the thermal properties in the above range.
  • Non-reinforcing inorganic filler is alternatively included in the composition, and the vulcanized product from the composition is used as sealing material for a lip seal.
  • the amount of the non-reinforcing inorganic filler is preferably 30 parts or less by weight per 100 parts of the polymer mixture. If the amount of the non-reinforcing inorganic filler is larger than 30 parts by weight per 100 parts of the polymer mixture, it is relatively hard to knead the ingredients, and the formation is impossible.
  • Non-reinforcing inorganic filler is selected from Natural mica, talc and bituminous coal filler, alternatively, any combination of the above mentioned non-reinforcing inorganic fillers is also added as non-reinforcing inorganic filler.
  • Natural mica Repco Mica S-325 is commercially available from REPCO LTD. and has an average particle diameter of 10 ⁇ m or larger and an aspect ratio of 30 or over for the flake diameter to flake thickness.
  • Austin Black 325 is commercially available from Coal Filler co.ltd. and has an average particle diameter of 6 ⁇ m and a specific gravity of 1.32.
  • One of graphite, molybdenum disulfide powder, nickel powder and fiber such as carbon fiber is alternatively included in 50 parts or less by weight in the composition per 100 parts by weight of the polymer mixture.
  • the vulcanized product becomes firmer so that the deformation becomes less.
  • the first lip seal 51 is deformed less by high pressure carbon dioxide gas, and sliding properties and abrasion resistance are improved. As a result, the reliability of the first lip seal 51 is improved.
  • plasticizer Five to twenty parts by weight of plasticizer is substantially included in the composition per 100 parts by weight of the polymer mixture. Thereby, the usability of sealing material at the relatively low temperature is improved.
  • EPDM is used as one of ethylene propylene copolymer rubber in the composition.
  • Ethylene propylene copolymer rubber includes ethylene-propylene bipolymer rubber, ethylene-propylene-butene terpolymer rubber, ethylene-1-butene copolymer rubber, ethylene-propylene-1-butene-non-conjugated-diene copolymer rubber and ethylene-1-butene-non-conjugated-diene copolymer rubber.
  • polyalkylene glycol is mixed with the carbon dioxide refrigerant gas as the refrigerating machine oil.
  • Polyol ester (POE) and polyvinyl ether (PVE) are alternatively used as the refrigerating machine oil.
  • the present invention is applied to the first lip seal 51 in the shaft sealing mechanism 50 for sealing the drive shaft 8
  • the present invention is alternatively applied to a packing, an O-ring, a gasket and a valve seal in a compressor.
  • the O-ring is arranged between the cylinder block 1 and the front housing 2 and/or between the cylinder block 1 and the rear housing 5 .
  • the present invention is applied to the first lip seal 51 in the shaft sealing mechanism 50 for sealing the drive shaft 8 .
  • the present invention is also applied to the second lip seal 55 .
  • the present invention is applied to sealing material used in the variable displacement type compressor 100 .
  • the present invention is also applied to sealing material used for a compressor other than a variable displacement type compressor.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Medicinal Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Polymers & Plastics (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Sealing Material Composition (AREA)
  • Compressor (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Sealing With Elastic Sealing Lips (AREA)
  • Sealing Devices (AREA)
  • Sealing Of Bearings (AREA)
US10/318,839 2001-12-19 2002-12-13 Sealing material for use in seal member in compressor and compressor inculuding the same Abandoned US20030138332A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2001-386235 2001-12-19
JP2001386235 2001-12-19
JP2002-126683 2002-04-26
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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040251578A1 (en) * 1999-11-12 2004-12-16 General Electric Company Molded, filled compositions with reduced splay and a method of making
US20050171266A1 (en) * 2003-06-10 2005-08-04 Matthijssen Johannes G. Filled compositions and a method of making
US20060269407A1 (en) * 2005-05-25 2006-11-30 Ab Skf Seal
US20080226471A1 (en) * 2007-03-12 2008-09-18 Kabushiki Kaisha Toyota Jidoshokki Variable displacement compressor
SG149762A1 (en) * 2007-07-12 2009-02-27 Nok Corp Vibration damping rubber and motor fixing mount
US20100244389A1 (en) * 2008-05-15 2010-09-30 Eagle Industry Co., Ltd. Lip type seal
US20110156355A1 (en) * 2009-12-28 2011-06-30 Nissin Kogyo Co., Ltd Seal member
US20130129537A1 (en) * 2011-11-17 2013-05-23 Panasonic Corporation Refrigerant compressor
KR101481183B1 (ko) 2009-08-25 2015-01-12 현대자동차주식회사 오일씰 조성물 및 이로 이루어진 오일씰
US9121276B2 (en) 2012-07-23 2015-09-01 Emerson Climate Technologies, Inc. Injection molded seals for compressors
US9605677B2 (en) 2012-07-23 2017-03-28 Emerson Climate Technologies, Inc. Anti-wear coatings for scroll compressor wear surfaces
EP4050242A1 (en) * 2021-02-26 2022-08-31 Eagle Industry Co., Ltd. Lip seal
CN115572421A (zh) * 2022-09-30 2023-01-06 上海熹贾精密技术有限公司 一种耐磨丁腈橡胶材料及其制备方法

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2579834T3 (es) 2004-07-13 2016-08-17 Tiax Llc Sistema y método de refrigeración
JP2008057332A (ja) 2006-08-29 2008-03-13 Sanden Corp 圧縮機
JP5261995B2 (ja) 2007-06-26 2013-08-14 Ｎｏｋ株式会社 ゴム組成物
FR2919613B1 (fr) * 2007-07-30 2009-10-09 Inergy Automotive Systems Res Objet a base d'une composition contenant un melange reticule d'elastomeres
JP4875597B2 (ja) * 2007-11-28 2012-02-15 イーグル工業株式会社 リップタイプシール
DE102008060258A1 (de) * 2008-12-03 2010-06-10 Lanxess Deutschland Gmbh Verwendung von natürlichen inaktiven Kautschuk-Füllstoffen zur Vermeidung der explosiven Dekompression bei flüssigem CO2
EP2938642A4 (en) 2012-12-31 2016-09-14 Reliance Ind Ltd ZIEGLER-NATTA HETEROGENEOUS CATALYST SYSTEM AND OLEFIN POLYMERIZATION METHOD USING THE SAME
EP2990438B1 (en) * 2013-04-26 2020-04-01 Zeon Corporation Nitrile rubber composition, crosslinkable rubber composition, and crosslinked rubber product
JP5984859B2 (ja) * 2014-01-27 2016-09-06 三菱電機株式会社 シール材およびそれを備えた圧縮機
EP3683261A4 (en) * 2017-09-15 2021-07-21 Nok Corporation HYDRATED NITRILE RUBBER COMPOSITION
CN110396230B (zh) * 2019-08-23 2021-09-03 陕西特种橡胶制品有限公司 一种核电循环泵轴瓦用硬质耐磨橡胶制品的制备方法

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4020039A (en) * 1974-05-13 1977-04-26 Polysar Limited Vulcanizable elastomeric compositions
US4725637A (en) * 1985-04-24 1988-02-16 Bp Chemicals Limited Process for the production of a thermoplastic elastomer composition
US4980406A (en) * 1988-07-22 1990-12-25 Polysar Limited Fortified polyacrylate resins
US4990570A (en) * 1988-06-09 1991-02-05 Nippon Zeon Co., Ltd. Curable rubber composition
US5140371A (en) * 1989-12-25 1992-08-18 Canon Kabushiki Kaisha Contact charging member, contact charging method making use of it, and apparatus making use of it
US5556919A (en) * 1994-09-30 1996-09-17 Nippon Zeon Co., Ltd. Rubber composition comprising nitrile group-containing highly saturated copolymer rubber and ethylenically saturated copolymer rubber
US5860656A (en) * 1993-04-09 1999-01-19 Mitsubishi Cable Industries, Ltd. Seal for rotating shaft
US6322086B1 (en) * 1998-12-03 2001-11-27 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Seal structure of compressor, and the compressor

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1327105A (fr) * 1962-03-27 1963-05-17 Dunlop Rubber Co Compositions de caoutchoucs synthétiques, notamment à base de copolymères et de butadiène et d'acrylonitrile
JP3346078B2 (ja) * 1995-02-09 2002-11-18 エヌオーケー株式会社 Ｎｂｒ系組成物
JP2001193843A (ja) * 2000-01-06 2001-07-17 Mitsubishi Cable Ind Ltd 回転軸シール

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4020039A (en) * 1974-05-13 1977-04-26 Polysar Limited Vulcanizable elastomeric compositions
US4725637A (en) * 1985-04-24 1988-02-16 Bp Chemicals Limited Process for the production of a thermoplastic elastomer composition
US4990570A (en) * 1988-06-09 1991-02-05 Nippon Zeon Co., Ltd. Curable rubber composition
US4980406A (en) * 1988-07-22 1990-12-25 Polysar Limited Fortified polyacrylate resins
US5140371A (en) * 1989-12-25 1992-08-18 Canon Kabushiki Kaisha Contact charging member, contact charging method making use of it, and apparatus making use of it
US5860656A (en) * 1993-04-09 1999-01-19 Mitsubishi Cable Industries, Ltd. Seal for rotating shaft
US5556919A (en) * 1994-09-30 1996-09-17 Nippon Zeon Co., Ltd. Rubber composition comprising nitrile group-containing highly saturated copolymer rubber and ethylenically saturated copolymer rubber
US6322086B1 (en) * 1998-12-03 2001-11-27 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Seal structure of compressor, and the compressor

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070138702A9 (en) * 1999-11-12 2007-06-21 General Electric Company Molded, filled polymer compositions with reduced splay and a method of making
US20040251578A1 (en) * 1999-11-12 2004-12-16 General Electric Company Molded, filled compositions with reduced splay and a method of making
US20050171266A1 (en) * 2003-06-10 2005-08-04 Matthijssen Johannes G. Filled compositions and a method of making
US20060269407A1 (en) * 2005-05-25 2006-11-30 Ab Skf Seal
US7670111B2 (en) * 2005-05-25 2010-03-02 Ab Skf Seal
US20080226471A1 (en) * 2007-03-12 2008-09-18 Kabushiki Kaisha Toyota Jidoshokki Variable displacement compressor
SG149762A1 (en) * 2007-07-12 2009-02-27 Nok Corp Vibration damping rubber and motor fixing mount
US20100244389A1 (en) * 2008-05-15 2010-09-30 Eagle Industry Co., Ltd. Lip type seal
US9163731B2 (en) * 2008-05-15 2015-10-20 Eagle Industry Co., Ltd. Lip type seal
KR101481183B1 (ko) 2009-08-25 2015-01-12 현대자동차주식회사 오일씰 조성물 및 이로 이루어진 오일씰
US20110156355A1 (en) * 2009-12-28 2011-06-30 Nissin Kogyo Co., Ltd Seal member
US8614273B2 (en) * 2009-12-28 2013-12-24 Nissin Kogyo Co., Ltd. Seal member
US20130129537A1 (en) * 2011-11-17 2013-05-23 Panasonic Corporation Refrigerant compressor
US9121276B2 (en) 2012-07-23 2015-09-01 Emerson Climate Technologies, Inc. Injection molded seals for compressors
US9605677B2 (en) 2012-07-23 2017-03-28 Emerson Climate Technologies, Inc. Anti-wear coatings for scroll compressor wear surfaces
EP4050242A1 (en) * 2021-02-26 2022-08-31 Eagle Industry Co., Ltd. Lip seal
CN115572421A (zh) * 2022-09-30 2023-01-06 上海熹贾精密技术有限公司 一种耐磨丁腈橡胶材料及其制备方法

Also Published As

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DE60218968D1 (de) 2007-05-03
EP1321499A3 (en) 2004-05-12
DE60218968T2 (de) 2007-12-06
EP1321499B1 (en) 2007-03-21
EP1321499A2 (en) 2003-06-25
JP2003246976A (ja) 2003-09-05

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