FR2546996A1 - Clean water stream protecting underwater bearing against erosion - Google Patents

Abstract

The bearings for the drive shaft of underwater appts. include a cylindrical bush (3) rotatably mounted on the shaft (1) and supporting a hub (6). Rings (8) largely cover both ends of the hub but are sepd. from it by lipped flexible sealing elements (14) in contact with a depression on the ring and a bevelled edge on the hub. An annular central aperture (10) through the bush and into the hub is supplied with fresh water flowing through an axial bore (12) in the shaft from an external feeder (13). From this aperture water is delivered through narrow bores (15) in the hub to the immediate vicinity of the sealing elements. Sealing element is pref. a rubber or plastics strip (14) with attached or embedded reinforcement. Modified delivery systems are also claimed.

Description

The present invention relates to a bearing protection device

  submerged intended to prevent rapid wear of the bearings in equipment intended for the removal of sand in a cleaning bed of a filtration installation, or to be used in sedimentation basins, in which sand, sludge, etc. , settle in sewage treatment plants, sewage treatment plants and industry

of paper making.

  The conventional submerged bearings of sludge scraping devices, scraping sand lifting devices, agitators, pumps, etc., used in these conditions wear a lot because

  penetration of sand and mud.

  Japanese patent published application No. 54653/82 describes a submerged bearing protection device in which a bearing is mounted so that it rotates on a sleeve fixed to a fixed shaft, a hub is fixed on the bearing, the two sides of the hub being covered by the outer edges of collars, the inner edges of these being fixed on the bearing, O-rings are mounted between the two edges of the hub and the outer edges of the collars, a flange of a chain sprocket being mounted on the hub, and the flange, the

  hub and bearing are rotated.

  In this submerged bearing protection device, fresh water is driven into a central water transmission passage formed in the center of the fixed shaft, via a water pipe which is fixed to the fixed shaft, the water being transmitted to an annular hole made in the bearing and the hub, from the water transmission passage, the water thus passing through the sleeve and being expelled by inclined passages of transmission of water formed to the outer edges through the annular hole, so that sand and mud do not

  cannot penetrate from the O-ring regions

  placed between the outer edges of the necklaces and

  both sides of the hub given the rotation of the flange.

  However, clean water can also be expelled to the external lateral edges of the collars so that the inclined water transmission passages open at constant intervals at the periphery of the two sides of the hub near the spaces between

  the two edges of the hub and the outer edges of the collars.

  As a result, when a lot of foreign material, sand, etc. is deposited in a cleaning bed,

  the effect of the seal obtained may not be sufficient.

  The invention therefore relates to a submerged bearing protection device in which the approach of sand and mud floating underwater, towards the spaces delimited between the two edges of the hub and the

  external edges of the collars, is sufficiently avoided.

  The invention thus relates to a submerged bearing protection device in which sealing members are arranged at the external edges of the collars and at the periphery of the hub near the external edges, of the parts for circulation of pressurized clean water.

  are formed in the sealing members by introduction

  tion of clean water, and when clean water is no longer transmitted, foreign matter such as sand and mud floating underwater does not enter

the sealing members.

  A device produced according to the invention and having the properties indicated, comprises a fixed shaft, a sleeve fixed thereon, a bearing mounted so that it can rotate at the periphery of the sleeve, collars having internal edges fixed on the sleeve and external edges respectively covering the two sides of the hub, and sealing members having bases fixed to the two edges of the hub or to the external edges of the collars and of the lips which are in contact with the external edges of the collars or of the two edges of the hub, so that clean water is transmitted to an annular hole made in the bearing and the hub, after circulation in a central water transmission passage formed in the center of the fixed shaft and by a passage formed in the sleeve, the water coming from a pipe fixed to the outside of the fixed shaft and being transmitted to water introduction parts

  clean under pressure between the sealing bodies

  cheek and both edges of the hub and the outer edges

  necklaces, via circulation passages

  tion formed in the hub or in spaces delimited between the sleeve and the bearing and between the collars and

  the pad, from the annular hole.

  Other characteristics and advantages of the invention

  tion will be better understood on reading the description

  which will follow from embodiments and with reference to the appended drawings in which: FIG. 1 is a section through a submerged bearing protection device of known type FIG. 2 is a section through a bearing protection device submerged according to a first embodiment of the invention;

  Figures 3 (a) and 3 (b) are gold sections

  gaskets for sealing; Figure 4 is a section of a submerged bearing protection device according to a second embodiment of the invention, Figure 5 is a section of a submerged bearing protection device according to a third embodiment of the invention; Figure 6 is a section through a device according to a fourth embodiment of the invention; Figure 7 is a section of a device according to a fifth embodiment of the invention; Figure 8 is a section through a device according to a sixth embodiment of the invention; Figure 9 is a plan view of a strip of a sealing member according to the invention Figure 10 is a section of a submerged bearing protection device according to a seventh embodiment of the invention Figure 11 is a section through a device according to an eighth embodiment of the invention; and FIG. 12 is a section through a device according to

  a ninth embodiment of the invention.

  Before the description of the embodiments

  preferred of the invention, the prior art is quickly considered in order to explain the operating principle and to indicate the defect of these known devices. In FIG. 1, a fixed shaft 1 is fixed to a coupling 2 by a screw 2 a as shown in mixed lines A sleeve 3 is fixed to the shaft 1 and a bearing 4 is mounted so that it can rotate on the sleeve 3 and it is divided into two parts A hub 6 is retained between projections 4 a and 4 b of the bearing 4 and it is fixed by two screws 5 A flange 7 of a chain sprocket is fixed to the external face of the hub by welding Collars 8 cover the two sides of the hub 6 and the internal edges 8 has collars are fixed to the sleeve 3, the outer edges 8 b covering the two ends of the hub 6, an O-ring 9 being placed between each

  outer edge 8b of a collar 8 and the edge of the hub 6.

  An annular hole is made between the parts

  of the hub 4 and it is produced by digging the hub 7.

  Several inclined transmission passages 11 are formed obliquely in the hub 6 and are directed towards

  the outer edges 8 b A central passage 12 for transmission

  water flow is formed in the center of the fixed shaft 1 and it is connected to the annular hole 10 The central passage 12 has a water circulation hole connected to a

water supply piping 13.

  In the protection device shown in FIG. 1, during the rotation of the flange 7, the sand

  and the mud which approach the outer edges 8 b are chas-

  ss by spraying clean water towards these external edges 8 b

  of the collar 8 from the inclined passages 11 of trans-

  water mission coming from the central passage 12 of the fixed shaft 1 and the annular hole 10, coming from the piping 13, so that the sand and the mud coming from the annular spaces delimited between the outside of the hub and the edges collars cannot

  not penetrate towards the O-rings.

  However, the sealing effect given by

  the inclined passages 11 of water is not sufficient when

  that these inclined passages are placed at intervals

  constant at the outer edges of the hub 6.

  FIG. 2 is a section through a first embodiment of a submerged bearing protection device according to the invention In FIG. 2, the reference 1 designates a fixed shaft, a reference 2 a coupling of shafts, the reference 3 a sleeve, reference 4 a bearing, reference 5 a screw, reference 6 a hub, reference 7 a flange, reference 8 for collars, reference 9 for O-rings, reference 10 an annular hole, reference 12 a central passage for water transmission and the reference 13 a water pipe and, as the references used in FIG. 2 correspond to similar elements in FIG. 1, they are not described in detail In the embodiment considered, the bases 14a of sealing members 14 are fixed to the external edges 8b, 8c of the collars 8 and the lips 14b of the members 14 are

  in contact with the external face of the hub 6.

  Clean water is transmitted to the parts 16 surrounded by the sealing members 14 from the annular hole 10 via the passages

  The collars 8 are fixed to the sleeve 3 by screwing.

  In the submerged bearing protection device, as the parts 16 which contain clean pressurized water are formed between the sealing members 14, the external faces of the hub 6 and the external edges 8 b, 8 c of the collars 8 , when clean water is transmitted to these parts 16 through the central passage 12, the annular hole 10 and the passages 15 from the water supply pipe 13, the lips 14 b of the members 14 move apart under the action of water under pressure, and clean water is driven from the parts 16 towards the periphery of the external face of the hub 6 and

  flows radially outwards along the hub 6.

  Consequently, the sand and the mud placed near the sealing members 14 and the collars 8 are driven out.

by the water that is projected.

  On the other hand, when the water pressure

  contained in parts 16 is reduced by deterioration

  tion or when the pump stops transmitting clean water, as the pressure of the water in the cleaning bed acts from the outside to the inside

  sealing members 14, the lips 14 b are repelled

  sées against the outer face of the hub 6, and penetration

  sand and mud towards the landing is avoided.

  The sealing members 14 are formed from an elastic material such as rubber or a plastic material. As shown in FIG. 3 (a), a member

  17 of reinforcement is embedded in the material 14

  and, as shown in Figure 3 (b), a reinforcing member 17 is attached to one side of the sealing material 14. Figure 4 is a section of the second embodiment of the immersed bearing protection device according to the invention In Figure 4, the reference 1 designates a fixed shaft, the reference 2 a coupling of shafts, the reference 2 has screws , reference 3 a sleeve, reference 4 a bearing, 1 reference 5 a screw, reference 6 a hub, reference 7 a flange, reference 8 of the collars, reference 9 of the O-rings, reference O an annular hole , the reference

  12 of the central water transmission passages, the reference

  13 a water pipe, the reference 14 of the sealing members, the reference 15 a water transmission passage, and the reference 16 of the parts containing clean water under pressure and, like the elements carrying the same references correspond to the elements of FIG. 2, they are not described in detail In this embodiment, a space 19 is formed between the sleeve 3 and the pad 4 and spaces 20 are formed between the collars 8 and the sides of the periphery of the O-ring 9 mounted between the outer edge 8b of each collar and the corresponding side of the hub 6, from the hole

  annular 10 and through spaces 19 and 20.

  In this embodiment, the bases 14a of the sealing members 14 are fixed to the external face of the hub 6 and the lips 14b of the members 14 contract

  against the outer edge 8b of each collar 8.

  In this embodiment, the seals

  are formed in the spaces 20 between the collars 8 and the sides of the hub 6 and the bearing 4 and in the space 19 delimited between the bearing 4 and the sleeve 3, and the parts 16 containing clean water under pressure are formed by the sealing members 14

  so that sand and mud cannot penetrate.

  In the embodiments of FIGS. 2 and 4, since the diameter of the collars 8 is equal to or less than that of the hub 6, the entire device

  bearing protection can be compact.

  FIG. 5 is a section of a third embodiment of a submerged bearing protection device according to the invention In FIG. 5, the reference 1 designates a fixed shaft, the reference 2 a coupling of shafts, the reference 3 a sleeve, reference 4 a bearing, reference 5 a screw, reference 6 a hub, reference 7 a flange, reference 8 for collars, reference 9 for O-rings, reference 10 an annular hole, reference 12 a passage

  central water transmission, reference 13 a hose-

  water supply, the reference 14 of the sealing members, the reference 15 of the water transmission passages, the reference 16 of the parts containing clean water at high pressure, and the references 19 and 20 of the spaces and the elements bearing these references are similar to the corresponding elements in FIG. 4 and are therefore not described in detail In this embodiment, the diameter of the collar 8 is less than or equal to that of the hub 6 and the O-ring 9 is deleted The bases 14a of the sealing members 14 are fixed to stepped portions 8c of the collars 8 and the lips 14b of the members 14 are in contact with

outside of hub 6.

  FIG. 6 is a section of a fourth embodiment of a device for protecting a submerged bearing according to the invention and the elements of FIG. 6 bearing references identical to those of elements of FIG. 5 are similar and are not therefore not described in detail The bases 14a of the sealing members 14 are fixed to the part 6a in steps and the lips

  14 b are in contact with the edges 8 b of the collars 8.

  In the embodiments of Figures and 6, as the diameter of the collars 8 is less than or equal to that of the hub 6, the whole of the protection device can be compact as the O-ring 9 is not used, the mechanical wear between the O-rings 9 and the outside of the hub 6 is avoided so that the flange 7 is rotated

high speed.

  As O-rings 9 are not used,

  the tightness ensured in this bearing can be reduced.

  However, this defect is eliminated by increase

the amount of clean water.

  FIG. 7 is a section of a fifth embodiment of a device for protecting a submerged bearing according to the invention In FIG. 7, the reference 1 designates a fixed shaft, the reference 2 a coupling of shafts, the reference 3 a sleeve, the reference 4 a bearing, the reference 5 of the screws, the reference 6 a hub, the reference 7 a flange, the reference 8 of the collars, the reference 9 of the O-rings, the reference one-annular hole, the reference 12 a central water transmission passage, reference 13 a water supply pipe, reference 14 of the sealing members, reference 15 of the water transmission passages, reference 16 of the parts containing water clean water under pressure, and the references 19 and 20 of the spaces and like the previous references designate elements similar to those of FIG. 5, they are not described in detail In this fifth embodiment, the transmission passages 15 of water is not formed and all of the water u own is transmitted to the parties

  16 under pressure through spaces 19 and 20.

  In this embodiment, since the passages are not formed in the hub 6, the production of the protection device is easier than in the embodiment of FIG. 5 Like all water

  clean is transmitted through spaces 19 and 20, the lubrication

  mutual cation of the collars 8 and the sides of the hub 6 and the bearing 4, and between the sleeve 3 and the bearing

  4 is improved and the sealing effect becomes significant.

  In this embodiment, since the clean water circulates towards narrow spaces, the circulation resistance to the passage towards the parts 16 under pressure from the spaces 19 becomes significant This problem can be solved by using a high pressure of

transmission of clean water.

  FIG. 8 is a section of a sixth embodiment of a device for protecting a submerged bearing according to the invention. As identical references designate elements similar to those of FIG. 7,

  they are not described in detail In this embodiment

  tion, sealing members are formed by stacking several ribbons, one side of the stacked ribbons being fixed to the hub 6 As shown in Figure 9, the ribbons 21 have an elastic core 21 has formed only at the base and not in a lip 21 b When the clean water is removed from the parts 16 of clean water under pressure, the lip 21 b opens easily When the ribbon 21 is put in circular form, the different layers of the ribbon 21 are folded by the stepped parts of the sides of the hub 6, and the two edges of the ribbons 21

are stacked and fixed.

  The protection device in this embodiment can have a split type submerged bearing, in which the rotary shaft is divided into two sections

  by a plane passing through the center of the tree.

  FIG. 10 is a section of a seventh embodiment of a device for protecting a submerged bearing according to the invention This embodiment differs

  of the first six embodiments and the tree rotates.

  In FIG. 10, the hub 24 is fixed to a body 22 by a screw 23 and a pad 25 is fixed in the hub 24 by a screw 26 A collar 27 has a cylindrical part 27 a which protrudes into the pad 25 and an edge 27 b

  which covers the outside of the edge of the hub 24.

  An O-ring 28 is fixed between the outside of the hub 24 and the inside of the outer edge of the collar 27 A needle stopper 29 is disposed between the collar 27 and the side of the pad 25 A sealing member 30 has a base 30 fixed to the hub 24 and a lip 30 b in contact with the outer edge of the collar 27 An edge of the rotary shaft

  31 is fixed in the cylindrical part 27 a of the collar 27.

  A water supply pipe 32 is fixed to the outside of the hub 24 and is connected to an annular hole 33 formed in a contact part between the hub 24

  and the pad 25, by a water circulation passage.

  Clean water is transmitted by a space 34 delimited between the hub 24 and the bearing 25, from the annular hole 33, and the clean water arrives at a part 36 under pressure surrounded by the sealing member 30, through a longitudinal passage 35, from

of space 34.

  In an apparatus having a rotary shaft as shown in FIG. 10, the entry of sand and mud between the bearing 25 and the cylindrical part 27 a of the collar 27 is prevented by a sealing member 30. FIG. 11 is a section of the eighth embodiment of a submerged bearing protection device according to the invention In FIG. 11, the reference 22 designates a body, the reference 23 a screw, the reference 24 a hub, the reference 25 a bearing, reference 26 a screw, reference 29 a needle stopper, the

  reference 31 a rotating shaft, reference 32 a pipe-

  terie of water supply, the reference 33 an annular hole, and the reference 34 a space, and as the references identical to those of FIG. 10 designate similar elements, they are not described in detail In this embodiment , the diameter of the outer edge 27 b of the collar 27 is less than or equal to that of the hub 24, the base 30 a of the sealing member 30 is fixed to the stepped portion 27 c of the edge 27 b of the collar 27, and the lip 30 b is in contact with the outside of the hub 24 Clean water is transmitted to the part 37 which is surrounded by the sealing member 30 by means of an inclined passage

38 from the annular hole 30.

  FIG. 12 is a cross-section of a ninth embodiment of a submerged bearing protection device according to the invention. As the references identical to those of FIG. 11 designate similar elements.

  to those of this figure, they are not described in detail.

  In this embodiment, the base 30 a of the sealing member 30 is fixed to the outside of the hub 24 and

  the lip 30b is in contact with the outer edge 27b of the collar.

  The clean water is transmitted through the lateral passage 39 formed in the hub 24 from the annular hole 33 and reaches the part 37 containing clean water under pressure.

  which is surrounded by the sealing member 30 through the

  median of the space delimited between the bearing 25 and the cylindrical part 27 a of the collar 27 and by the space delimited between the external edge 27 b and the needle stop

  29 and the hub 24 from the lateral passage 39.

  As indicated above, the sealing member or members are mounted according to the invention between the hub and one or more collars, and the clean water is transmitted to one or more parts containing pressurized water which are surrounded by one or more sealing members, the water being expelled between the lip or lips of the sealing members and the outside of the hub or the edge or the outer edges of the clamp (s) As a result, rapid wear of the bearing is avoided in all devices with a shaft

fixed or a rotating shaft.

  Of course, various modifications can be made by those skilled in the art to the devices which have just been described only by way of examples.

  non-limiting without departing from the scope of the invention.

Claims (15)

  1 device for protecting a submerged bearing, characterized in that it comprises a fixed shaft (1), a sleeve (3) fixed to the shaft, a bearing (4) mounted so that it rotates around the sleeve, a hub (6), collars (8) having internal edges fixed to the sleeve and external edges covering both sides of the hub, and sealing members (14) having bases fixed to the two edges of the hub (6 ) or at the outer edges of the collars and the lips in contact with the outer edges of the collars or the edges of the hub, clean water being transmitted to an annular hole (10) formed in the bearing and the hub, via d '' a central water transmission passage formed in the center of the fixed shaft and a passage formed in the sleeve from a water supply pipe fixed to the outside of the fixed shaft, l being transmitted to parts (16) of clean pressurized water delimited between the sealing members, the two edges of the hub and the outer edges of the collars, via water circulation passages formed in the hub or delimited spaces between the sleeve and the bearing and between the collars and the bearing, from the annular hole.   2 Device according to claim 1, character-   laughed in that the diameter of the collars (8) is smaller or equal to that of the hub (6).   3 Device according to claim 2, character-   rised in that O-rings (9) are mounted between   the outer edges of the collars and the outside of the hub.   4 Device according to claim 1, character-   risé in that the sealing member (14) is formed of a elastic material.   Device according to claim 4, characterized in that the elastic material is rubber or plastic.   6 Device according to claim 1, character-   risé in that a reinforcing member (17) is coated at the base of the sealing member.   7 Device according to claim 1, character-   rised in that a reinforcing member (17) is fixed   on the side of the base of the sealing member.   8 Device according to claim 1, character-   risé in that the sealing member (21) is formed   stacked ribbons with a soul on one side.   9 Device according to claim 1, character-   risé in that the sealing member (21) comprises a tape having an elastic coating whose shape is modified by pressurized water, a core being formed   inside the elastic covering member.   Device for submerged bearing protection, characterized in that it comprises: a hub (24) fixed to a body, a bearing (25) fixed in the hub, a collar (27) having a cylindrical part fixed to the bearing so that 'she could turn and having   an outer edge forming an orifice in the cylinder part   drique, the outer edges covering the sides of the hub and the bearing, a needle stopper (29) mounted between the outer edge and the side of the bearing, a rotary shaft (31) one end of which is fixed in the cylindrical part, and a sealing member (30) having a base fixed to the outside of the hub or to the outer edge of the collar and a lip which is in contact with the outer edge of the collar or the outside of the hub, clean water being transmitted by an annular hole formed in the hub, from a water supply pipe fixed to the hub, the water reaching a part containing pressurized water delimited between the sealing member, the outside the hub and the outer edge of the collar by means of a water circulation passage formed in the hub or by a space delimited between the bearing and the cylindrical part of the collar, starting from the annular hole. 11 Device according to claim 10, characterized in that the outer edge of the collar (27) covers the outside of the hub.   12 Device according to claim 11, charac-   characterized in that an O-ring (28) is mounted between   the outer edge of the collar and the outside of the hub.   13 Device according to claim 10, characterized in that the diameter of the collar (27) is   less than or equal to that of the hub.   14 Device according to claim 10, characterized in that the sealing member (30) is formed of elastic material.   Device according to claim 14,   characterized in that the elastic material is the rubber cabbage or plastic.   16 Device according to claim 10, characterized in that a reinforcing member (17)   is embedded in the base of the sealing member.   17 Device according to claim 16, characterized in that a reinforcing member (17)   is attached to the side of the base of the sealing member.   18 Device according to claim 10, characterized in that the sealing member (21) is   formed of stacked bands having a core on one side.   19 Device according to claim 10, characterized in that the sealing member (21) comprises a strip having an elastic coating which changes shape under the action of water under pressure, and a core   formed inside the elastic covering member.