WO2022149329A1 - Palier lisse, dispositif de palier lisse et pompe - Google Patents

Palier lisse, dispositif de palier lisse et pompe Download PDF

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Publication number
WO2022149329A1
WO2022149329A1 PCT/JP2021/038556 JP2021038556W WO2022149329A1 WO 2022149329 A1 WO2022149329 A1 WO 2022149329A1 JP 2021038556 W JP2021038556 W JP 2021038556W WO 2022149329 A1 WO2022149329 A1 WO 2022149329A1
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WIPO (PCT)
Prior art keywords
mass
less
bearing
graphite
area ratio
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PCT/JP2021/038556
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English (en)
Japanese (ja)
Inventor
成夏 金
憲一 杉山
真 小宮
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株式会社荏原製作所
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Application filed by 株式会社荏原製作所 filed Critical 株式会社荏原製作所
Priority to CN202180089421.4A priority Critical patent/CN116710657A/zh
Publication of WO2022149329A1 publication Critical patent/WO2022149329A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/02—Selection of particular materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/046—Bearings
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C17/00—Sliding-contact bearings for exclusively rotary movement
    • F16C17/12—Sliding-contact bearings for exclusively rotary movement characterised by features not related to the direction of the load
    • F16C17/14—Sliding-contact bearings for exclusively rotary movement characterised by features not related to the direction of the load specially adapted for operating in water
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/20—Sliding surface consisting mainly of plastics

Definitions

  • the present invention relates to a plain bearing preferably used as a radial bearing of a rotating machine such as a pump, a plain bearing device provided with the plain bearing, and a pump provided with the plain bearing device.
  • the resin material used for the slide bearing of the slide bearing device is required to have a low wear rate during operation in a slurry such as SiO 2 .
  • the slide bearing device is not only operated in water but also in the atmosphere such as controlled operation and preceding standby operation, that is, sliding.
  • the bearing slip surface of the bearing device may be operated under dry conditions exposed to the atmosphere.
  • the slide bearing device is operated under dry conditions, there is a problem that the temperature of the resin material on the slide surface of the bearing rises due to heat generated by friction with the rotating shaft of a pump or the like, causing deformation and wear of the resin material. ..
  • various types of pumps that are operated under dry conditions, and the range of conditions for the rotational speed (V) and sliding surface pressure (P) of the rotating shaft supported by the slide bearing, and the PV value (of the rotating shaft).
  • the range of (rotational speed x sliding surface pressure) has expanded to higher value conditions, and under such harsher conditions, the above-mentioned deformation and wear of the resin material of the slide bearing become more remarkable. There is a problem.
  • the resin material used for the slide bearing of the slide bearing device has a small friction coefficient and low heat generation during operation under dry conditions, and is compared. It is also required that heat generation can be suppressed and operation can be performed even in the range of a high PV value.
  • the conventional plain bearing device is a plain bearing device provided with a plain bearing containing fluororesin, aromatic polyetherketone, carbon fiber, graphite, and unavoidable impurities, and the plain bearing device has the fluororesin on the slide surface of the plain bearing.
  • a plain bearing containing fluororesin, aromatic polyetherketone, carbon fiber, graphite, and unavoidable impurities has the fluororesin on the slide surface of the plain bearing.
  • the carbon fiber has an area ratio of 4% or more and 17% or less
  • the graphite has an area ratio of 5% or more and 15% or less
  • the aromatic A plain bearing device (Patent Document 1) is known in which the polyetherketone and the unavoidable impurities occupy the remaining area.
  • the plain bearing in the plain bearing device described in Patent Document 1 has a graphite area ratio of 5% or more, a high graphite content, and does not contain boron nitride as an additive. Further, it is a slide bearing device provided with a slide bearing containing aromatic polyetherketone, talc, carbon fiber, and unavoidable impurities, and the content of the talc in the slide bearing is 7% by mass or more and 18% by mass or less.
  • a plain bearing device (Patent Document 2) is known in which the area ratio of the carbon fiber on the slide surface of the slide bearing is 27% or more and 35% or less.
  • the plain bearing in the plain bearing device described in Patent Document 2 has a high carbon fiber area ratio of 27% or more, and contains talc as an additive.
  • the plain bearing is formed of a resin composition consisting of aromatic polyetherketone, fluororesin, boron nitride, carbon fiber, graphite, and unavoidable impurities.
  • the content of the graphite with respect to the resin composition is 5% by mass or less (including 0% by mass), and the total content of the boron nitride, the carbon fibers, and the graphite is 30% by mass or less.
  • the area ratio of the carbon fibers on the sliding surface of the sliding bearing is less than 10%, however, the area ratio of the carbon fibers is an optical microscope (for any five points of the sample piece cut out from the sliding surface of the sliding bearing). Observation field by 500 times): The average area ratio obtained from the area of the region where the brightness is 75% or more in the HSB color space by image processing the portion of 589 ⁇ m in length ⁇ 442 ⁇ m in width.
  • the plain bearings are provided.
  • a plain bearing device equipped with a plain bearing is formed of a resin composition consisting of aromatic polyetherketone, fluororesin, boron nitride, carbon fiber, graphite, and unavoidable impurities.
  • the content of the graphite with respect to the resin composition is 5% by mass or less (including 0% by mass), and the total content of the boron nitride, the carbon fibers, and the graphite is 30% by mass or less.
  • the area ratio of the carbon fibers on the sliding surface of the sliding bearing is less than 10%, however, the area ratio of the carbon fibers is an optical microscope (for any five points of the sample piece cut out from the sliding surface of the sliding bearing).
  • the average area ratio obtained from the area of the region where the brightness is 75% or more in the HSB color space by image processing the portion of 589 ⁇ m in length ⁇ 442 ⁇ m in width.
  • the plain bearing device is provided.
  • the sliding surface of the sliding bearing is configured to be operable in either a state of being in contact with the atmosphere or a state of being in contact with water mixed with earth and sand.
  • the aromatic polyetherketone is a polyetherketone, a polyetheretherketone, a polyetherketoneketone, a polyetheretherketoneketone, or a combination thereof.
  • the fluororesin is polytetrafluoroethylene, tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer, tetrafluoroethylene / hexafluoropropylene copolymer, or tetrafluoroethylene / ethylene. It is preferably a polymer or a combination thereof.
  • a pump provided with the above-mentioned plain bearing is provided.
  • a plain bearing device used in a plain bearing device for a radial bearing of a submersible pump which has excellent slurry wear resistance during operation in a slurry.
  • heat generation is suppressed even in a relatively high PV value range with a small friction coefficient and low heat generation in dry condition operation.
  • a slide bearing that is operable. Further, it is also possible to provide a slide bearing device provided with the slide bearing and a pump provided with the slide bearing device.
  • FIG. 1 is a cross-sectional view showing the entire vertical shaft pump 3 that performs the preceding standby operation.
  • the vertical shaft pump 3 has a discharge elbow 30 installed and fixed on the floor where the pump is installed, a casing 29 connected to the lower end of the discharge elbow 30, and an impeller 22 connected to the lower end of the casing 29. It is provided with a discharge bowl 28 for storing the water inside, and a suction bell 27 connected to the lower end of the discharge bowl 28 and for sucking water.
  • one rotating shaft 10 formed by connecting two upper and lower shafts to each other by a shaft joint 26 is formed. Have been placed.
  • the rotary shaft 10 is supported by an upper bearing 32 fixed to the casing 29 via a support member and a lower bearing 33 fixed to the discharge bowl 28 via the support member.
  • An impeller 22 for sucking water into the pump is connected to one end side (suction bell 27 side) of the rotating shaft 10.
  • the other end side of the rotating shaft 10 extends to the outside of the vertical shaft pump 3 through a hole provided in the discharge elbow 30, and is connected to a drive machine such as an engine or a motor that rotates the impeller 22.
  • a shaft seal 34 such as a floating seal, a gland packing, or a mechanical seal is provided between the rotary shaft 10 and the hole provided in the discharge elbow 30, and the water handled by the vertical shaft pump 3 is collected by the shaft seal 34. Prevent the outflow to the outside of 3.
  • the drive unit will be installed on land so that maintenance and inspection can be easily performed.
  • the rotation of the drive is transmitted to the rotation shaft 10 and the impeller 22 can be rotated. Water is sucked from the suction bell 27 by the rotation of the impeller 22, passes through the discharge bowl 28 and the casing 29, and is discharged from the discharge elbow 30.
  • FIG. 2 is an enlarged view of the bearing device applied to the bearings 32 and 33 shown in FIG.
  • FIG. 3 is a perspective view of a plain bearing installed in the bearing device shown in FIG.
  • the bearing device has a sleeve 11 made of stainless steel, ceramics, sintered metal, or surface-modified metal on the outer periphery of the rotating shaft 10.
  • the sleeve 11 can have a Vickers hardness (Hv) of 800 or more and 2500 or less, for example.
  • a slide bearing 1 made of a hollow cylindrical resin material is provided on the outer peripheral side of the sleeve 11.
  • the outer peripheral surface of the sleeve 11 faces the inner peripheral surface (sliding surface) 1a of the sliding bearing 1 via a very narrow clearance, and is configured to slide with respect to the sliding bearing 1.
  • the slide bearing 1 is fixed to a support member 13 connected to a pump casing 29 (see FIG. 1) or the like via a brim portion 12a by a bearing case 12 made of metal or resin.
  • the slide bearing 1 has a hollow cylindrical shape, the inner peripheral surface (slip surface) 1a faces the outer peripheral surface of the sleeve 11, and the outer peripheral surface 1b fits into the bearing case 12. Will be done.
  • the slide bearing device according to the present embodiment has, for example, the same structure as the slide bearing device shown in FIG. That is, the slide bearing device according to the present embodiment has a rotating shaft 10 and a sleeve 11 which are rotating bodies, and a sliding bearing 1 which is a fixed body. Further, the slide bearing 1 used in the slide bearing device according to the present embodiment has the same structure as the slide bearing 1 shown in FIG.
  • the slide bearing 1 is formed of a resin composition composed of aromatic polyetherketone, fluororesin, boron nitride, carbon fiber, graphite, and unavoidable impurities.
  • the inner peripheral surface of the cylindrical sliding bearing 1 constitutes the inner peripheral surface (sliding surface) 1a of the bearing that comes into contact with the outer peripheral surface of the sleeve 11.
  • the graphite content with respect to the resin composition is 5% by mass or less (including 0% by mass), and the boron nitride, the carbon fiber, and the like.
  • the total content of the graphite is 30% by mass or less, and the area ratio of the carbon fibers on the sliding surface of the sliding bearing is less than 10%.
  • the wear rate in the slurry is 23 ⁇ m / h or less
  • the temperature rise value of the slide bearing at the PV value: 1.5 MPa ⁇ m / s is 120 ° C. or less
  • the friction coefficient of the slide bearing in s is 0.1 or less, the slurry wear resistance performance during operation in the slurry is excellent, and the friction coefficient is small, the heat generation is small, and the PV value is relatively high in the operation under dry conditions. Even within the range, heat generation can be suppressed and operation becomes possible.
  • the fluororesin has the effect of reducing the wear rate in the slurry and the friction coefficient at a PV value of less than 1.0 MPa ⁇ m / s, but at a PV value of 1.0 MPa ⁇ m / s or more.
  • the temperature rise of the plain bearing tends to be large.
  • Boron nitride has a lubricating effect at high temperatures.
  • Graphite functions as a solid lubricant, but tends to reduce its lubricating effect at high temperatures.
  • the carbon fiber has the effect of increasing the strength and reducing the coefficient of linear expansion.
  • the present invention is to form a plain bearing from a resin composition optimized for the composition of resin components (aromatic polyether ketone, fluororesin), boron nitride, carbon fiber, and graphite during operation in a slurry. It is possible to provide a plain bearing that has excellent slurry wear resistance performance, has a small coefficient of friction and generates little heat in operation under dry conditions, and can suppress heat generation even in a relatively high PV value range.
  • the total content of boron nitride, carbon fiber, and graphite with respect to the resin composition shall be 30% by mass or less, 28% by mass or less, 26% by mass or less, 23% by mass or less, or 20% by mass or less. You can also.
  • the total content of boron nitride, carbon fiber, and graphite can be 5% by weight or more, 10% by weight or more, 15% by weight or more, 18% by mass or more, or 20% by mass or more.
  • the content of graphite in the resin composition is 5% by mass or less (including 0% by mass), and may be 3% by mass or more and 5% by mass or less.
  • the average particle size of graphite is preferably larger than 3 ⁇ m and 15 ⁇ m or less.
  • the area ratio of carbon fibers on the sliding surface of the sliding bearing is less than 10%, and may be 9.5% or less, 9% or less, 8% or less, or 7% or less. Further, the area ratio of the carbon fiber may be 1% or more, 2% or more, 3% or more, or 4% or more.
  • the content of carbon fibers in the resin composition is not particularly limited, but may be 3% by mass or more and 12% by mass or less, 4% by mass or more and 11% by mass or less, or 5% by mass or more and 10% by mass or less.
  • the carbon fibers are preferably composed of short fibers.
  • the diameter of the carbon fiber observed on the sliding surface 1a of the bearing is preferably 5 ⁇ m or more and 10 ⁇ m or less, more preferably 5.5 ⁇ m or more and 9 ⁇ m or less, and most preferably 6 ⁇ m or more and 8 ⁇ m or less.
  • the diameter of the carbon fiber is analyzed using an optical microscope (digital microscope VHX-7000 (manufactured by Keyence), objective lens VHX-E500 (500 to 2500 times)) using an image analysis program described later. It can be measured from the above.
  • the length of the carbon fiber observed on the sliding surface 1a of the bearing is preferably 5 ⁇ m or more and 1000 ⁇ m or less, more preferably 6 ⁇ m or more and 500 ⁇ m or less, and most preferably 7 ⁇ m or more and 200 ⁇ m or less.
  • the length of the carbon fiber use an optical microscope (digital microscope VHX-7000 (manufactured by Keyence), objective lens VHX-E500 (500 to 2500 times)) and perform image analysis using the image analysis program described later. It can be measured by doing.
  • the aspect ratio (length / diameter) of the carbon fibers observed on the sliding surface 1a of the bearing is preferably 2 or more and 100 or less, more preferably 10 or more and 100 or less, and most preferably 30 or more and 100 or less.
  • the content of boron nitride in the resin composition is not particularly limited, but may be 13% by mass or more and 22% by mass or less, 14% by mass or more and 21% by mass or less, or 15% by mass or more and 20% by mass or less.
  • the boron nitride is not particularly limited, and examples thereof include hexagonal boron nitride (h-BN), cubic boron nitride (c-BN), and combinations thereof, but hexagonal boron nitride is preferable.
  • the average particle size of boron nitride is preferably larger than 4 ⁇ m and 20 ⁇ m or less.
  • the aromatic polyetherketone is not particularly limited, and includes polyetherketone (PEK), polyetheretherketone (PEEK), polyetherketoneketone (PEKK), polyetheretherketoneketone (PEEKK), and combinations thereof. Although mentioned, polyetheretherketone is preferable.
  • the fluororesin is not particularly limited, and is not particularly limited, such as polytetrafluoroethylene (PTFE), tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer (PFA), tetrafluoroethylene / hexafluoropropylene copolymer (FEP), and tetra. Fluoroethylene-ethylene copolymer (ETFE) and combinations thereof can be mentioned, but polytetrafluoroethylene is preferable.
  • the content of the fluororesin in the resin composition is not particularly limited, but may be 10% by mass or more and less than 20% by mass, 12% by mass or more and 18% by mass or less, or 13% by mass or more and 17% by mass or less. In particular, by setting the content of the fluororesin to less than 20% by mass, the moldability when molding the slide bearing from the resin composition can be improved.
  • the content of boron nitride can be measured by the following method. That is, 100 g of the molded slide bearing is measured and fired at 800 ° C. to decompose and volatilize components such as carbon fiber and fluororesin, boron nitride is recovered as ash, and the mass of ash is measured. Then, the ratio of the mass of the ash (boron nitride) to the mass (100 g) of the slide bearing is calculated and used as the content of boron nitride.
  • the area ratio of carbon fiber is determined by image processing the observation field of 589 ⁇ m in length ⁇ 442 ⁇ m in width for any 5 points of the sample piece cut out from the slide surface of the slide bearing with an optical microscope (500 times) in the HSB color space. It is an average area ratio obtained from the area of an area where Brightness is 75% or more. A specific example of such a method for measuring the area ratio of carbon fibers will be described below. A square sample piece of 5 mm in length ⁇ 5 mm in width is cut out from the slip surface of the molded slide bearing, and the surface of the sample piece is polished.
  • the ratio of the carbon fiber area to the total area of the observation portion is calculated, and the average of the calculated values at the five points is calculated and used as the carbon fiber area ratio.
  • the image analysis of the observed portion of the surface of the sliding bearing can be performed by using the image analysis program: Image J (implemented by the "Analyze parameters" command), and the image analysis condition is the pixel "Color Threshold” in the measurement program Color Threshold. Set to "Hue 0 to 225, Saturation 0 to 225, Brightness 170 to 225", and set the others to the default settings.
  • This image analysis program is used to extract a portion having the same pixel characteristics as the pixel characteristics (brightness, color) of the carbon fiber.
  • Image J the region of Brightness 170 to 225 is extracted, which means that the region of Brightness of 75% or more is extracted in the HSB color space.
  • the area ratio of carbon fibers can be directly measured for each sliding bearing by the above method, but unlike that, for example, the carbon fibers are based on the volume ratio (volume%) of the carbon fibers as shown below. It is also possible to calculate the area ratio of.
  • volume fraction (volume percent) and area fraction Naoko Sato et al., “Transition and Prospects of Morphological Evaluation of Material Structure”, Iron and Steel, Vol.100 (2014), No.10, p.1182-1190 And, as described in Yoshitaka Adachi, “Computer Assisted 3D Metric Morphology”, Vo. 61 (2011), No. 2, p.78-84, it is obtained from multiple observational surfaces in a multiphase structure.
  • the value of the volume ratio (volume%) of the carbon fibers in the slide bearing can be used as the value of the area ratio of the carbon fibers.
  • the volume ratio (volume%) of the carbon fibers in the slide bearing is calculated based on, for example, the content ratio (mass%) and the specific gravity of each component contained in the slide bearing, as shown in Examples described later. You can also.
  • a resin composition was prepared by dry blending a powder of aromatic polyetherketone, a powder of fluororesin, a powder of boron nitride, a carbon fiber, and a powder of graphite, and the resin composition was compression-molded.
  • the slide bearing can be manufactured by subjecting it to surface processing.
  • the plain bearing device can be used to manufacture a plain bearing device, and further, the plain bearing device can be used to manufacture a pump.
  • Example 1 In Example 1, a powder of aromatic polyetherketone (polyetheretherketone), a powder of fluororesin (polytetrafluoroethylene), so that the content (% by mass) of each component becomes the value shown in Table 1. Powder of boron nitride (average particle size 4 ⁇ m), carbon fiber (diameter about 6 ⁇ m, length about 100 ⁇ m), and graphite (particle size 1 to 20 ⁇ m) powder (No. 1 to 3 of the present invention does not contain graphite). ) was dry-blended to produce pellets. The obtained pellets were placed in a mold, pressurized and heated, and molded for primary processing, and then given a detailed shape by machining for secondary processing to manufacture a plain bearing. Then, the wear rate of the obtained slide bearing in the slurry described later was evaluated. The results are shown in Table 1 and FIG.
  • Example No. of the present invention Nos. 1 to 4 and Comparative Example No.
  • the wear rates of the slide bearings 1 to 6 in the slurry were measured according to the following procedure.
  • (Abrasion rate in slurry) First, the concentration of sand particles containing silica sand having an average particle size of about 5 ⁇ m (main component: Si02 ) and silica sand having an average particle size of about 30 ⁇ m in a ratio of 1: 1 is 3000 mg / L. It was put into water as described above to prepare a slurry.
  • a bearing device including a slide bearing (a device including a rotary shaft 10, a sleeve 11, a slide bearing 1, and a bearing case 12 (including a brim portion 12a) in FIG.
  • the graphite content is 5% by mass or less (including 0% by mass), the total content of boron nitride, carbon fiber, and graphite is 30% by mass or less, and carbon.
  • Example No. of the present invention in which the volume ratio (volume%) of the fiber is less than 10% (that is, the area ratio is less than 10%).
  • the wear rate in the slurry was as low as 23 ⁇ m / h or less.
  • the content of graphite is 5% by mass or less, the total content of boron nitride, carbon fiber, and graphite exceeds 30% by mass, and the volume ratio (volume%) of carbon fiber is 10% or more.
  • the sliding bearings 1 to 6 had a high wear rate of 28 ⁇ m / h or more in the slurry. From the above, the present invention example No. It was found that by specifying the composition of the resin composition forming the slide bearing as in 1 to 4, the wear rate in the slurry can be reduced and the slurry wear resistance can be improved.
  • Example 2 Example No. of the present invention shown in Table 1.
  • the following limit PV value and friction coefficient were evaluated. The results are shown in Table 2 and FIGS. 5 and 6.
  • the present invention example No. From the approximate straight line of FIG. 5, the present invention example No. It can be estimated that the temperature rise value of the slide bearing of No. 1 is 120 ° C. or less at a PV value of 1.5 MPa ⁇ m / s, and it can be seen that the temperature rise of the slide bearing can be suppressed. Further, from the approximate straight line of FIG. 6, the present invention example No. It can be inferred that the friction coefficient of the slide bearing of 1 is 0.1 or less at a PV value of 1.0 MPa ⁇ m / s, and it can be seen that the friction can be reduced. Therefore, the present invention example No. It was found that the slide bearing of No. 1 was excellent in slurry wear resistance, had a good evaluation of the limit PV value, and had a small friction and was good.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sliding-Contact Bearings (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

L'invention concerne un palier lisse et une pompe comprenant le dispositif de palier lisse, dans lequel il existe une résistance exceptionnelle à l'usure par la bouillie pendant le fonctionnement dans de l'eau (bouillie) contenant des matières étrangères telles que de la terre et du sable.　Ce palier lisse est formé à partir d'une composition de résine comprenant un polyéther cétone aromatique, une résine fluorée, du nitrure de bore, des fibres de carbone, du graphite et des impuretés inévitables. Par rapport à la composition de résine, la teneur en graphite est de 5 % en masse ou moins (y compris 0 % en masse) et la teneur totale du nitrure de bore, des fibres de carbone et du graphite est de 30 % en masse ou plus. Le rapport de surface des fibres de carbone sur une surface de glissement du palier lisse est inférieur à 10 %, mais à n'importe quel nombre de cinq emplacements de morceaux d'échantillon découpés à partir de la surface de glissement du palier lisse, le rapport de surface des fibres de carbone est un rapport de surface moyen déterminé à partir des zones de régions ayant une luminosité d'au moins 75 % dans l'espace de couleur HSB, par traitement d'image d'une section mesurant 589 μm de longueur × 442 µm de largeur dans un champ d'observation à l'aide d'un microscope optique (500x).
PCT/JP2021/038556 2021-01-06 2021-10-19 Palier lisse, dispositif de palier lisse et pompe WO2022149329A1 (fr)

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Application Number Priority Date Filing Date Title
CN202180089421.4A CN116710657A (zh) 2021-01-06 2021-10-19 滑动轴承、滑动轴承装置及泵

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JP2021000929A JP2021060122A (ja) 2021-01-06 2021-01-06 すべり軸受、すべり軸受装置、及びポンプ
JP2021-000929 2021-01-06

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012077764A (ja) * 2010-09-30 2012-04-19 Ntn Corp 複合滑り軸受
JP2013194769A (ja) * 2012-03-16 2013-09-30 Ebara Corp すべり軸受装置
JP2016180440A (ja) * 2015-03-23 2016-10-13 Ntn株式会社 ラジアル滑り軸受

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012077764A (ja) * 2010-09-30 2012-04-19 Ntn Corp 複合滑り軸受
JP2013194769A (ja) * 2012-03-16 2013-09-30 Ebara Corp すべり軸受装置
JP2016180440A (ja) * 2015-03-23 2016-10-13 Ntn株式会社 ラジアル滑り軸受

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CN116710657A (zh) 2023-09-05

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