摘要:
The present invention relates to an annular sliding fluoroplastics member which is requested to have good mechanical properties, resistance to abrasion and wear, thermal conductivity, heat resistance, and the like, and also to a method of producing such an annular sliding fluoroplastics member. The annular sliding fluoroplastics member of the invention has a composite structure which mainly consists of fluorine plastics and short fibers, and 20 or more wt. % of short fibers by weight of a total amount of the short fibers are oriented in a direction along which a burden of a load is large. According to this configuration, the buckling resistance and the pressure resistance are enhanced. A member having a high buckling resistance can be used in a thrust slide bearing or a thrust washer in which a large press load is applied in the axial direction, and a member having a high pressure resistance can be used in a radial slide bearing in which a large press load is applied in a radial direction. In some cases, in the annular sliding fluoroplastics member of the invention, filaments consisting of long fibers may be stitched to the inner peripheral face or the like, the surface is covered with an expanded graphite sheet, or the member is impregnated with a lubricant. The member having such a structure is excellent in buckling resistance and pressure resistance in a radial direction, and also in resistance to abrasion and wear, thermal conductivity, etc. According to the production method of the invention, a cutting work step can be omitted, and therefore materials can be prevented from being wastefully used, and the production cost can be reduced.
摘要:
An expanded graphite sealing material is provided in which the adaptability of the principal face of an expanded graphite base member is improved, the bonding strength to a coating layer and the like can be increased, and the sealing properties can be enhanced. A method of producing such a sealing material and a gasket sheet using the sealing material are also of concern. On at least a portion of a principal face of the expanded graphite base member in which expanded graphite particles are pressurized and integrated together, opened thin-leaf graphite portions are formed. The principal face of the expanded graphite base member having the thin-leaf graphite portions can be impregnated with a sealing member such as PTFE or covered with a coating layer. As the form of the sealing material, a sheet, a press-molded product, a fabric, a string, or a braided article can be adopted.
摘要:
The heat-resisting material according to the present invention comprises a fiber aggregate containing crystalline alumina short fibers and formed in a continuous length and an inflammable sheathing for maintaining the shape of the fiber aggregate in a compressed state. The expansion percentage of the fiber aggregate after burn-off of the sheathing is not less than 10% by volume based on the volume of fiber aggregate in a compressed state. This heat-resisting material can be worked into various forms of product of the heat-resisting material such as rope, square bar, sheet, etc., according to the purpose of use. The present heat-resisting material is provided in continuously long products, has high heat resistance and restoring property, and can be easily applied to the openings or spaces ranged continuously in the longitudinal direction, such as the boundaries between the blocks of the heat-resisting material and joints.
摘要:
An expanded graphite sealing material is provided in which the adaptability of the principal face of an expanded graphite base member is improved, the bonding strength to a coating layer and the like can be increased, and the sealing properties can be enhanced. A method of producing such a sealing material, and a gasket sheet using the sealing material are also of concern. On at least a portion of a principal face of the expanded graphite base member in which expanded graphite particles are pressurized and integrated together, opened thin-leaf graphite portions are formed. The principal face of the expanded graphite base member having the thin-leaf graphite portions can be impregnated with a sealing member such as PTFE or covered with a coating layer. As the form of the sealing material, a sheet, a press-molded product, a fabric, a string, or a braided article can be adopted.
摘要:
A gasket having a concentrically waved metal sheet, i.e., a core member, which has a PTFE sheet or an inorganic sheet of sealing-property layered and bonded on each of its opposite surfaces. The gasket makes it possible to ensure a stable sealing-property for a long period of time with a low to a high fastening-load applied. The metal sheet has valley portions, which were conventionally vacant gaps, and are filled with powdered sealing member to be embedded from the beginning. Therefore, the PTFE sheet or the inorganic sheet at the valley portions of the metal sheet that conventionally could not be compressed with a low fastening-load applied is compressed and even with the low fastening-load applied can secure a fastening surface-pressure over the entire surface. Further, since it is possible to suppress the deformation of the sheet in quantity, which was conventionally large, the PTFE sheet or the inorganic sheet each of low-fluidity are arranged so as not to be broken with a high fastening-load applied and the thinner PTFE sheet or the thinner inorganic sheet can be used.
摘要:
A shaft seal apparatus that exhibits a good and reliable sealing performance, even when a rotating shaft undergoes axial vibration, eccentric revolution, or the like. This shaft seal apparatus has gland packings (2) stuffed in a sealed space (10) formed between a rotating shaft (9) and a stuffing box (1), with gland packings (2) pressed between a first packing gland (3) on a sealed liquid region side (7) and a second packing gland (4) on an atmospheric region side (8). The first packing gland (3) is fixed to a rotary equipment body (6) and the second packing gland (4) is to the stuffing box (1). A screw bolt (15) extending in the axial direction of the rotating shaft (9) is anchored to the first packing gland (3). The stuffing box (1) is provided with a through hole (16) larger than the screw bolt (15) in the flange (1a). The screw bolt (15) running through the through hole (16) has a tightening nut (17) thereon at a place which is out of and backward of the hole (16). A compression coil spring (18) is mounted on screw bolt (15) between flange (1a) and tightening nut (17).
摘要:
The present invention relates to a metal-covered gasket in which a soft core member (2, 12, 22, 32, 42, 52) containing unexpanded or expanded vermiculite is covered with a metallic sheet (3, 13A, 13B, 23A, 23B, 33A, 33B, 43, 53A, 53B). There are provided good sealing properties by the soft core member mainly composed of inorganic fibers and treated unexpanded vermiculite the expansion amount and expansion force of which are increased due to ion exchange by treatment with chemicals, or by the soft core member solely made of expanded vermiculite. Reinforcing metallic sheets (44, 54) for restraining the vermiculite from transversely sliding and for further improving the entire shape retention may be embedded in the soft core member or laminated on the surface thereof.
摘要:
The packing according to the present invention is composed of a string-like body formed of an elongated tape-like packing material having at least one layer is repeatedly folded in direction at a right angle to the longitudinal direction thereof in a zigzag manner with peak portions and valley portions alternately formed. According to the packing, the string-like body cut into a predetermined length according to the diameter of a shaft with which it is to be used may be wound on the outer peripheral surface of the shaft with the width or thickness direction of the string-like body directed in the radial direction of the shaft. Thus, the packing is versatile with respect to the shaft diameter. The packing itself produces no slip in the axial direction of a shaft. This prevents the packing from protruding, thus eliminating stress release due to a decrease in volume. The packing is used with the string-like body folded in the three-dimensional directions. Accordingly, the shaft-following properties of the packing at the time when the same is worn, are satisfactory and the decrease in sealing properties is restrained.
摘要:
A gland packing having increased compressibility, increased allowable limit of twist, increased tensile strength, and excellent serviceability and versatility characteristics is disclosed which comprises a plurality of flexible graphite sheets cut to a width of less than 5 mm and laid in superposed relation to one another, the laid-up cut sheets being covered with a fiber material by knitting or braiding to form a knitting thread, the knitting thread being twisted. Also, a gland packing having a further increased tensile strength is disclosed wherein a plurality of strands of the knitting thread are gathered and twisted or braided. In addition, a gland packing having improved contacting and sealing properties is disclosed wherein the covering fiber material exposed on the surface of the packing is removed at least in part.
摘要:
A gasket having a concentrically waved metal sheet, i.e., a core member, which has a sheet of sealing-property layered and bonded on each of its opposite surfaces. The gasket has an enhanced adaptability of the sheet material and enables the thinner sheet to be used and at the same time makes it possible to ensure a stable sealing-property for a long period of time with a low to a high fastening-load applied. The metal sheet has valley portions, which were conventionally vacant gaps, and are filled with powdered sealing member to be embedded from the beginning. Therefore, the sheet at the valley portions of the metal sheet that conventionally could not be compressed with a low fastening-load applied can be compressed and even with the low fastening-load applied can secure a fastening surface-pressure over the entire surface. Further, since it is possible to suppress the deformation of the sheet in quantity, which was conventionally large, a sheet made of not only the high-fluidity material but also the low-fluidity material can be used as well as the thinner sheet.