CN210422855U

CN210422855U - Bearing sealing mechanism of water turbine

Info

Publication number: CN210422855U
Application number: CN201921341932.7U
Authority: CN
Inventors: 彭云龙; 王春
Original assignee: Leshan Minyuan Power Generation Equipment Co Ltd
Current assignee: Leshan Minyuan Power Generation Equipment Co Ltd
Priority date: 2019-08-19
Filing date: 2019-08-19
Publication date: 2020-04-28
Anticipated expiration: 2029-08-19

Abstract

The utility model discloses a bearing seal mechanism of hydraulic turbine, including hydraulic turbine casing upper cover body, the loading groove of setting at hydraulic turbine casing upper cover body upper surface central point position, the shaft hole of setting in the inside lower extreme central point of loading groove puts, insert the leading axle of establishing in the shaft hole, the bearing of loading in the loading groove, the cover is established at leading epaxially and the tip is installed at the gland of hydraulic turbine casing upper cover body upper surface, install at the gland centre bore and embolia the sealing ring of leading axle, the outer edge of loading groove is equipped with the insertion groove. The lower end of the soft ring is pressed by the ring protrusion to cause the lower end of the soft ring to be concave, the lower end of the soft ring is attached to the ring protrusion in a soft mode, and therefore the soft ring has good sealing performance.

Description

Bearing sealing mechanism of water turbine

Technical Field

The utility model relates to a bearing sealing mechanism of hydraulic turbine.

Background

Most of the water turbines are installed in a hydropower station and used for driving a generator to generate electricity, and in the hydropower station, water in an upstream reservoir is guided to the water turbines through water guide pipes to push water turbine rotating wheels to rotate so as to drive the generator to generate electricity.

The lower side of the main guide shaft is connected with a rotating wheel of a water turbine and used for transmitting rotating force to a generator, the main guide shaft is inserted into a shaft hole of an upper cover of a water turbine shell, an assembly groove is formed in the upper side of the shaft hole, a bearing is inserted into the assembly groove, the inner wall of the inner ring of the bearing is in interference fit with the main guide shaft, because the outer ring of the bearing is higher than the inner ring, in order to stabilize the position of the whole bearing, a sealing cover is mostly installed on the upper cover of the water turbine shell, the upper end of the outer ring of the bearing is pressed through the sealing cover, thereby stabilizing the position of the bearing in the assembly groove, the sealing cover is mostly in a circular ring structure, a sealing ring is bonded in a center hole of the sealing cover, a sealing ring position circular ring structure is formed by casting Babbitt alloy, the inner wall of the sealing ring, the defects are as follows: although the inside rivers of hydraulic turbine casing can not follow sealing ring and leading spindle cooperation gap and flow, because gland and hydraulic turbine casing and bearing upper surface are only for supporting the press fit, when the inside rivers water pressure of hydraulic turbine casing is big, ooze from gland and hydraulic turbine casing and bearing upper surface cooperation gap easily, therefore the leakproofness is not high.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a bearing seal mechanism of hydraulic turbine to when proposing the inside rivers water pressure of hydraulic turbine casing in solving above-mentioned background art big, ooze from gland and hydraulic turbine casing and bearing upper surface cooperation gap easily, therefore the not high problem of leakproofness.

In order to achieve the above object, an embodiment of the present invention provides a bearing sealing mechanism for a water turbine, including a water turbine housing upper cover body, a loading groove disposed at a central position of an upper surface of the water turbine housing upper cover body, a shaft hole disposed at a central position of an inner lower end of the loading groove, a main guide shaft inserted in the shaft hole, a bearing inserted in the loading groove, a gland sleeved on the main guide shaft and having an end portion mounted on the upper surface of the water turbine housing upper cover body, a sealing ring mounted in a central hole of the gland and sleeved on the main guide shaft, an insertion groove disposed at an outer edge of the loading groove, a soft ring mounted on the gland and corresponding to the loading groove, a ring projection disposed at an inner lower end of the insertion groove, the soft ring inserted into the insertion groove and abutting against the ring projection, a mounting ring disposed at an outer edge of the gland, and a penetration hole uniformly disposed, and the upper cover body of the water turbine shell is provided with screw rods at each position corresponding to the through holes, the screw rods penetrate through the through holes and are locked by nuts.

Furthermore, the insertion groove is of a circular groove structure.

Furthermore, the soft ring is of a circular ring structure.

Furthermore, the annular protrusion is a circular ring-shaped protrusion structure with an isosceles trapezoid main section.

Furthermore, the filling layer is uniformly arranged in the insertion groove and positioned at the inner edge and the outer edge of the annular protrusion, and the filling layer is of a circular ring structure.

Furthermore, the screw rods and the nuts are at least four groups.

To sum up, the utility model has the advantages of it is following: the nut locking screw, the gland drives the soft ring to support the pressure ring to be convex, when the lower end of the soft ring is supported by the downward pressure, the lower end of the soft ring is supported by the convex ring to be concave, the lower end of the soft ring is flexibly attached to the convex ring, so that the sealing performance is good, the packing layer is supported by the soft ring to be pressed downwards to form a circular ring structure, as the inner part of the packing layer is fine and dense, water flow can be prevented from passing through the inner part of the packing layer, so that the water flow is prevented from permeating into the supporting and pressing gap of the soft ring and the convex ring, so that the double water sealing protection is realized, when the water pressure of the water flow in the hydraulic turbine shell is large, the leakage is not easy to occur from the matching gap of the gland and the upper surface of the hydraulic turbine shell and the upper surface of the bearing, and the problem of low sealing performance is solved.

Drawings

Fig. 1 is a schematic view partially cut away from a front view in one embodiment of the present invention;

fig. 2 is a schematic top view of an embodiment of the present invention;

fig. 3 is a schematic top view partially cut away in one embodiment of the present invention.

Wherein, 1 hydraulic turbine casing upper cover body, 2 loading grooves, 3 shaft holes, 4 leading spindles, 5 bearings, 6 glands, 7 sealing rings, 8 insertion grooves, 9 soft rings, 10 ring bulges, 11 packing layers, 12 mounting rings, 13 through holes, 14 screws and 15 nuts.

Detailed Description

Referring to fig. 1, 2 and 3, a bearing sealing mechanism of a water turbine includes a water turbine housing upper cover body 1, a loading groove 2 disposed at a central position of an upper surface of the water turbine housing upper cover body 1, a shaft hole 3 disposed at a central position of an inner lower end of the loading groove 2, a main guide shaft 4 inserted in the shaft hole 3, a bearing 5 loaded in the loading groove 2, a gland 6 sleeved on the main guide shaft 4 and having an end portion mounted on the upper surface of the water turbine housing upper cover body 1, a sealing ring 7 mounted in a central hole of the gland 6 and sleeved in the main guide shaft 4, the loading groove 2 is a circular groove structure, the shaft hole 3 is a circular hole structure, the shaft hole 3 is in sliding fit with the main guide shaft 4, the gland 6 is a circular ring structure, the lower end of the gland 6 presses an outer ring of the bearing 5 and the upper surface of the water turbine housing upper cover body 1, so that the bearing 5 is stably mounted in the loading groove 2, sealing ring 7 is the ring structure, and sealing ring 7 adopts the babbitt metal die-casting to form, and the inner wall sliding contact capstan shaft 4's of sealing ring 7 outer wall, the inner wall stable contact capstan shaft 4 of sealing ring 7 not only have lubricated effect, sealed effect in addition can prevent that the inside rivers of hydraulic turbine casing from flowing out in capstan shaft 4 and the 7 cooperation gaps of sealing ring.

Referring to fig. 1 and 3, an insertion groove 8 is formed in an outer edge of the insertion groove 2, the insertion groove 8 is of a circular groove structure, the insertion groove 8 is formed in an upper surface of the upper cover body 1 of the turbine housing and located at an outer edge of the insertion groove 8, a soft ring 9 is installed on the gland 6 at a position corresponding to the insertion groove 2, a lower end of the gland 6 is bonded to an upper end of the soft ring 9 by resin adhesive, the soft ring 9 is of a circular ring structure, the soft ring 9 is made of neoprene rubber and is soft and has high corrosion resistance, a ring protrusion 10 is installed at a lower end inside the insertion groove 8, the ring protrusion 10 is of a circular ring-shaped protrusion structure with an isosceles trapezoid main section, the soft ring 9 is inserted into the insertion groove 8 and abuts against the ring protrusion 10, the ring protrusion 10 is integrated with the upper cover body 1 of the turbine housing and the turbine housing, a packing layer 11 is uniformly installed in the insertion groove 8 and at inner, the packing layer 11 is a ring structure formed by pressing the soft ring 9 downwards, and the inner part of the packing layer 11 is fine and dense, so that water flow can be prevented from passing through the inner part of the packing layer, and the water flow is prevented from permeating into pressing gaps of the soft ring 9 and the annular protrusion 10.

Referring to fig. 1 and 2, a mounting ring 12 is installed on the outer edge of the gland 6, the inner wall of the mounting ring 12 is welded on the upper side of the outer wall of the gland 6, penetrating holes 13 are evenly distributed on the mounting ring 12 in an annular shape, the mounting ring 12 is in a circular ring structure, the number of the penetrating holes 13 is four, the annular shape is evenly arranged on the mounting ring 12, screw rods 14 are respectively installed on the upper cover body 1 of the turbine housing and correspond to the penetrating holes 13, the lower ends of the screw rods 14 are welded and connected with the upper surface of the upper cover body 1 of the turbine housing, the screw rods 14 penetrate the penetrating holes 13 and are locked by nuts 15, the screw rods 14 and the penetrating holes 13 are in sliding fit, the nuts 15 lock the screw rods 14, the gland 6 drives the soft ring 9 to press the annular protrusion 10, when the soft ring 9 is in a natural state, the lower end of the soft ring 9 is a plane, when downward pressing force is applied, the lower end of, the lower end of the soft ring 9 is flexibly attached to the ring protrusion 10, so that the sealing performance is good, and four groups of screw rods 14 and nuts 15 are provided.

Nut 15 locking screw 14, gland 6 drives soft ring 9 and supports protruding 10 of pressing ring, when receiving downward offset pressure, soft ring 9's lower extreme receives the support of protruding 10 of ring and presses and cause the indent of soft ring 9 lower extreme, soft lower extreme soft of ring 9 is taken off and is attached on protruding 10 of ring, thereby has good closure, packing layer 11 supports the ring structure that presses down at soft ring 9 and form, because the interior part of packing layer 11 is fine and close, can prevent rivers through its inside, thereby prevent rivers and to soft ring 9 and the protruding 10 of ring and support and press the gap infiltration, thereby have dual water seal protection, therefore when the inside rivers water pressure of hydraulic turbine casing is big, be difficult for oozing from gland 6 and hydraulic turbine casing upper cover body 1 and bearing 5 upper surface fit gap, therefore the leakproofness is higher.

While the present invention has been described in detail and with reference to the accompanying drawings, it is not to be considered as limited to the scope of the invention. Various modifications and changes may be made by those skilled in the art without inventive step within the scope of the appended claims.

Claims

1. The utility model provides a bearing seal mechanism of hydraulic turbine, including hydraulic turbine casing upper cover body (1), the loading groove (2) of setting at hydraulic turbine casing upper cover body (1) upper surface central point position, shaft hole (3) of setting at the inside lower extreme central point of loading groove (2) put, main guide shaft (4) of establishing in shaft hole (3) are inserted, bearing (5) in loading groove (2) are packed into, the cover is established on main guide shaft (4) and gland (6) of tip installation at hydraulic turbine casing upper cover body (1) upper surface, install gland (6) centre bore and embolia sealing ring (7) of main guide shaft (4), its characterized in that: the outer edge of dress income groove (2) is equipped with insertion groove (8), soft ring (9) have been installed to the position that gland (6) are gone up, correspond dress income groove (2), the inside lower extreme of insertion groove (8) is equipped with and has been looped around protruding (10), soft ring (9) insert insertion groove (8) and support and press the protruding (10) of ring, collar (12) have been installed along the outer edge of gland (6), ring shape has evenly been laid on collar (12) and has been worn hole (13), screw rod (14) have been installed respectively to each position that corresponds worn hole (13) on hydraulic turbine casing upper cover body (1), screw rod (14) are worn out and are worn hole (13) and screw rod (14) and pass through nut (15) locking.

2. A bearing seal mechanism for a water turbine according to claim 1, wherein: the insertion groove (8) is of a circular groove structure.

3. A bearing seal mechanism for a water turbine according to claim 1, wherein: the soft ring (9) is of a circular ring structure.

4. A bearing seal mechanism for a water turbine according to claim 1, wherein: the annular protrusion (10) is of a circular ring type protrusion structure with an isosceles trapezoid main section.

5. A bearing seal mechanism for a water turbine according to claim 2, wherein: the packing layers (11) are uniformly arranged in the insertion groove (8) and positioned at the inner edge and the outer edge of the annular protrusion (10), and the packing layers (11) are of a circular ring structure.

6. A bearing seal mechanism for a water turbine according to claim 1, wherein: the screw rods (14) and the nuts (15) are at least four groups.