JP5635245B2 - Structure of thrust bearing for water lubrication - Google Patents

Description

  The present invention relates to a structure of a thrust bearing for water lubrication which receives a thrust load of a rotary shaft of a screw compressor or other underwater machine.

  Generally, as a thrust bearing for an underwater machine such as a screw compressor or a submersible pump, a completely oil-free thrust bearing for water lubrication is used.

  This water-lubricating thrust bearing is composed of a rotating disk provided on a rotating shaft and a fixed thrust member provided opposite to the rotating disk and provided in a fixed system, and a lubricating water supply groove is provided in the fixed thrust member. The fixed thrust member receives the thrust load from the rotating disk through water by supplying water from the lubricating water supply groove to the sliding surface of the fixed thrust member facing the rotating disk.

  The fixed thrust member of the water-lubricating thrust bearing is made of ceramics, carbon material, plastics, or the like.

JP 61-99721 A

  By the way, in the conventional water-lubricating thrust bearing as described above, it is necessary to form a lubricating water supply groove in the fixed thrust member. However, since ceramics and carbon materials have high hardness and are easily cracked, they are from other than sliding surfaces. There are no drilling or grooves for water supply.

  Plastics materials are easy to drill holes and grooves for water supply, but they are easily deformed due to low strength and low Young's modulus, have short life due to wear, and have problems such as swelling due to water. is there.

  For the above reasons, the water-lubricating thrust bearing has not been put into practical use.

  Furthermore, even if the rotating disk and the fixed thrust member are disposed in water and the water supply groove is formed on the sliding surface, the sliding surface is in contact with the rotating disk that is the counterpart material, so that the centrifugal force As a result, the water supplied between the rotating disk and the opposed sliding surface is easily discharged to the outside. Therefore, even if it is simply placed in the water, there is a risk that it will lead to seizure if water is not supplied efficiently, and it is essential to provide a lubricating water supply groove in the fixed thrust member.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a water-lubricating thrust bearing that solves the above-described problems, and that has a sliding surface that is opposed to the rotating disk made of ceramics and that can efficiently supply water between the sliding surfaces. To provide a structure.

To achieve the above object, the structure of the thrust bearing water lubricated invention comprises a rotary disk provided on the rotating shaft, and a fixed thrust member to the opposite provided on the rotating disc slide with the rotary disk wherein the fixed and supplying water between the sliding surfaces of the thrust member and said rotary disc, in the structure of the thrust bearing water lubricated carrying a thrust load, the fixed thrust member, the wear of the ceramic or carbon material A fixed sliding member having the sliding surface and a metal material made of stainless steel or aluminum and formed separately from the fixed sliding member , composed of a back metal to be joined to the moving surface, to characterized in that the formation of the lubricant supplying groove on one or both of the junction surface between the back metal and the fixing slide member .

Further , a water retaining groove for supplying the lubricating water supplied from the lubricating water supply groove in the radial outer periphery and the circumferential direction of the sliding surface may be formed on the sliding surface of the fixed sliding member.

Further , adjacent surfaces having different heights may be formed on the sliding surface of the fixed sliding member in the circumferential direction of the sliding surface.

The lubricating water supply groove is formed in the joint surface between the fixed sliding member and the back metal so as to go from the outer peripheral side to the insertion hole through which the central rotation shaft is inserted, and the lubricating water supply groove is formed in the insertion hole of the fixed sliding member. The lubricating water introduction groove for flowing the lubricating water from the lubricating surface to the sliding surface is formed, and the water retaining groove for flowing the lubricating water from the lubricating water introducing groove radially outward is formed on the sliding surface, and the outer periphery of the water retaining groove A weir for flowing lubricating water in the water retaining groove to the sliding surface may be provided on the side, and the fixed sliding member and the back metal may be fixed by bolt fastening.

  According to the present invention, even if any one of ceramics and carbon materials is applied to the fixed sliding member, water can be supplied from the inside of the thrust bearing between the rotating disk and the sliding surface, and low viscosity water can be supplied. Even if it is used for lubrication, it is easy to be in a fluid lubrication state, and the life can be extended. In addition, the performance of water-lubricated thrust bearings may be improved and the practical application may be accelerated.

It is a top view which shows the sliding surface of the thrust bearing for water lubrication of one embodiment of this invention. (A) is a schematic whole structure sectional view of the thrust bearing for water lubrication of one embodiment of the present invention, and (b) is an important section expanded sectional view circled by (a). 1 is a schematic overall configuration diagram of a water-lubricating thrust bearing according to an embodiment of the present invention.

  A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

  1 to 3, reference numeral 10 denotes a rotating disk attached to a rotating shaft 11, and a fixed thrust member 12 is provided so as to face the rotating disk 10 to constitute a thrust bearing.

  The fixed thrust member 12 includes a fixed sliding member 14 having a sliding surface 13 facing the rotating disk 10 and a back metal 15 formed of SUS (stainless steel) or aluminum provided on the back surface of the fixed sliding member 14. Is done.

  The fixed sliding member 14 is formed of a wear-resistant material such as ceramics or carbon material, and the shape thereof is formed in an annular shape having an insertion hole 16 through which the rotary shaft 11 is inserted. A water retaining groove 17 extending from the insertion hole 16 to the outer peripheral side is formed on the sliding surface 13 of the fixed sliding member 14 facing the rotating disk 10. The insertion hole 16 located in the water retention groove 17 is formed with an arc-shaped lubricating water introduction groove 18, and a weir 19 slightly lower than the sliding surface 13 is formed on the outer peripheral side of the water retention groove 17.

  As shown in FIGS. 1 and 3, for example, six water retention grooves 17 are formed, and bolt insertion holes 20 are provided on the outer peripheral side of the three water retention grooves 17, and bolt insertion holes are provided on the back metal 15. A screw hole 21 is formed facing 20.

  The sliding surface 13 is formed with surfaces 13a and 13b having different heights with the water retaining groove 17 as a boundary, and the clockwise surface 13a with respect to the water retaining groove 17 is formed higher than the counterclockwise surface 13b. The surfaces 13a and 13b are formed in the circumferential direction for each water retaining groove 17, and a step 22 is formed between the adjacent surfaces 13a and 13b.

  In the present invention, the lubricating water supply groove 24 is formed on one or both of the joint surfaces 25 of the fixed sliding member 14 and the back metal 15, and on the back surface of the fixed sliding member 14 in this embodiment from the outer peripheral side. It is formed so as to face the insertion hole 16.

  The lubricating water supply groove 24 formed in the fixed sliding member 14 is a groove having an arcuate cross section, and even if the fixed sliding member 14 is formed of ceramics or carbon material, it is not drilled. Similarly to the water retaining grooves 17 and the surfaces 13a and 13b having different heights, they can be easily formed by cutting or by integral molding.

  Further, after forming the fixed sliding member 14, the back metal 15 is aligned with the fixed sliding member 14, a bolt (not shown) is inserted from the bolt insertion hole 20, and the bolt is tightened into the screw hole 21 of the back metal 15, The fixed sliding member 14 and the back metal 15 can be integrated into the fixed thrust member 12.

  In addition, you may make it couple | bond using an epoxy-type adhesive agent instead of couple | bonding the fixed sliding member 14 and the back metal 15 with a volt | bolt.

  Next, the operation of this embodiment will be described.

  First, the back metal 15 of the fixed thrust member 12 is fixed to a fixed system, and the sliding surface 13 of the fixed sliding member 14 is provided so as to face the rotating disk 10 to constitute a thrust bearing.

  Although not shown, the thrust bearing is provided so as to be immersed in water, and the lubricating water supply groove 24 is supplied with lubricating water from the outer diameter side toward the center side. The lubricating water supplied to the lubricating water supply groove 24 flows from the rotary shaft 11 to the water retaining groove 17 through the arc-shaped lubricating water introducing groove 18, flows in the water retaining groove 17 radially outward, and is dammed by the weir 19. Stopped and flows from the water retaining groove 17 to the sliding surface 13 in the circumferential direction. The sliding surface 13 is formed by surfaces 13a and 13b having different heights in the circumferential direction of the water retaining groove 17, and mainly retains the lubricating water on the lower surface 13b, and the lubricating water on the higher surface 13a. And a thrust load is received by the lubricating water between the higher surface 13a and the rotating disk 10. Thus, the lubricating water flows through the water retaining groove 17, is applied to the sliding surface 13 from the center side to the outside, and is efficiently supplied in the circumferential direction, so that it can receive a thrust load due to water lubrication. Although steps are provided on the sliding surfaces 13a and 13b, when the load capacity is relatively small, the sliding surfaces 13a and 13b can receive a thrust load even if they are on the same plane.

  In the present invention, as described above, the fixed thrust member 12 is divided and formed by the fixed sliding member 14 and the back metal 15, and the fixed sliding member 14 having the sliding surface 13 is wear-resistant such as ceramics or carbon material. By forming the back metal 15 with a corrosion-resistant metal material such as SUS or aluminum, the lubricating water supply groove 24 can be easily processed even if the sliding surface 13 is formed with ceramics or the like. Is possible.

  Further, when the lubricating water supply groove 24 is formed, the shape and supporting strength of the thrust bearing are held by the back metal 15, so there is no problem even if the fixed sliding member 14 is divided into two parts or thickened. The lubricating water supply groove 24 can be processed more easily.

DESCRIPTION OF SYMBOLS 10 Rotating disk 11 Rotating shaft 12 Fixed thrust member 13 Sliding surface 14 Fixed sliding member 15 Back metal 16 Insertion hole 17 Water retaining groove 18 Lubricating water introduction groove 19 Weir 24 Lubricating water supply groove 25 Joining surface

Claims (5)

A rotating disk provided on the rotating shaft; and a fixed thrust member that faces the rotating disk and slides on the rotating disk, and is provided between the sliding surface of the fixed thrust member and the rotating disk. In the structure of a thrust bearing for water lubrication that supplies thrust and receives thrust load,
The fixed thrust member is formed of a ceramic or carbon wear-resistant material, and is formed of a fixed sliding member having the sliding surface and a metal material of stainless steel or aluminum, and the fixed sliding member. And a back metal joined to the anti-sliding surface side of the fixed sliding member , and a lubricating water supply groove having an arc-shaped cross section is formed on the joint surface of the fixed sliding member with the back metal A structure of a thrust bearing for water lubrication characterized by the above.   The water retaining groove for water lubrication according to claim 1, wherein a water retaining groove for supplying the lubricating water supplied from the lubricating water supply groove in the radial outer periphery and the circumferential direction of the sliding surface is formed on the sliding surface of the fixed sliding member. Thrust bearing structure.   The structure of the water-lubricating thrust bearing according to claim 1 or 2, wherein adjacent surfaces having different heights are formed on a sliding surface of the fixed sliding member in a circumferential direction of the sliding surface. The lubricating water supply groove is formed on the joint surface with the back metal of the fixed sliding member so as to go from the outer peripheral side to the insertion hole through which the central rotation shaft is inserted, and the lubricating water supply groove is formed in the insertion hole of the fixed sliding member. The lubricating water introduction groove for flowing the lubricating water from the lubricating surface to the sliding surface is formed, and the water retaining groove for flowing the lubricating water from the lubricating water introducing groove radially outward is formed on the sliding surface, and the outer periphery of the water retaining groove The weir for flowing the lubricating water of the water retaining groove to the sliding surface is provided on the side, and the fixed sliding member and the back metal are fixed by bolt fastening or an epoxy-based adhesive. The structure of the thrust bearing for water lubrication as described.   The structure of the thrust bearing for water lubrication of Claim 4 which formed the said weir lower than the said sliding surface.

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