CN209725289U - A kind of power station ball valve pivot structure - Google Patents

Abstract

The utility model discloses a kind of power station ball valve pivot structure.Bearing uses copper-based mosaic self-lubricating bearing shell.Copper-based mosaic self-lubricating bearing shell is mounted in bearing steel bushing, can be split out out of valve body with steel bushing in the case where valve body does not understand concrete conditions in the establishment of a specific crime.Between steel bushing and valve body, valve shaft and stainless steel shaft bushing using bolt conjunction structure, be convenient for changing.The O-shaped static seal of twice, steel bushing inside and tri- dynamic sealing of valve shaft contact site Gong She are equipped on the outside of steel bushing with valve body contact position, together close on the inside of valve body, using O-shaped rubber seal, rises and seals Sha Zuoyong, seal groove is equipped with by-pass prot；Together on the outside of valve body, using U-shaped polyurethane sealing ring, in the outside of U-shaped polyurethane sealing ring, if combination Glais ring sealing together.Leak drainage hole is sealed with setting pivot between Glais ring sealing is combined in U-shaped polyurethane sealing ring.The utility model is simple and compact for structure, versatile, and installation and repairing is convenient.

Description

A kind of power station ball valve pivot structure

Technical field:

The utility model relates to a kind of power station ball valve pivot structures.

Background technique:

Ball valve is the essential auxiliary device of the hydraulic turbine, open and close the frequency with hydraulic turbine main body as, plus shutdown with Operating condition is overhauled, actual motion condition is more harsh compared with hydraulic turbine main body, runing time is longer.Ball valve pivot is the key that ball valve Component includes mainly valve shaft, steel bushing, bearing shell and sealing etc., is mounted in valve body axle bed hole, is primarily subjected to valve opening and closing When act on the axial hydraulic thrust on valve shaft, ball valve and the hydraulic turbine can be operated normally and maintenance plays vital work With.In order to guarantee that the safety and reliability of ball valve, pivot should have enough strength and stiffness, can bear various operating conditions, Dynamic water closes operating condition, water pressure and vibration under operating condition of test, and injurious deformation cannot occur；Should have enough fatigue Service life is able to bear dynamic stress when frequently opening and closing and various change workings.Large pumped storage power plant is more in recent years, and general Relatively high all over head, and since start stop operation is frequent, pipeline pressure fluctuation is big, therefore, to the safety of structure of ball valve, can There is higher requirement by property and operation operating characteristics.It is in comparative analysis conventional power plant and High Head Pumped Storage Power Station herein Ball valve pivot structure after, for high water head large pumped storage power plant severe service condition invention ball valve pivot knot Structure.

With the continuous increase of Hydropower Unit capacity and size in recent years, previous pivot structure exposes successively in use The problem of several respects:

1. not having Packed structure on the outside of bearing shell, if the by-pass prot of bearing shell blocks, bearing shell outside pressure can make bearing shell It deforms valve shaft locking and then damages bearing shell.

2. using self-lubricating material for adhered bearing bush structure, if bond degree is not enough easy to happen obscission.

3. being sintered to the bearing bush structure of stainless steel base using self-lubricating material, it is de- also once to there is bearing shell self-lubricating material It falls and damages, drainage occurs for fragment damage sealing.

4. generate relative displacement both when valve rotation without being reliably fixed measure between steel bushing and valve body, make steel bushing with Sealing wear leak between valve body.

5. valve shaft sealing gland bolt makes bolt looseness without locking device, long-play and vibration, moved outside gland, sealing Leak.

6. valve shaft surface uses the structure of soldering stainless steel bushing, there is abrasion on discovery valve shaft surface when replacing bearing shell, for Integral ball valve structure is limited since valve body is non-dismountable, and by axis hole size, and bearing surface can not be repaired.

Summary of the invention:

The purpose of the utility model is to provide a kind of power station ball valve pivot structure, allow to replace previous structure, Problem above is solved together, and is adapted to the severe High Head Pumped Storage Power Station of service condition.The purpose of this utility model It is by being realized with flowering structure: by steel bushing (2), copper-based mosaic self-lubricating bearing shell (3), stainless steel shaft bushing (4), sealing gland (6), thrust plate (7), combination Glais ring sealing (9), U-shaped polyurethane sealing ring (10), O-shaped rubber seal (11), O-shaped quiet close (12) composition is sealed, the steel bushing (2) that copper-based mosaic self-lubricating bearing shell (3) is mounted on bearing is inner, between steel bushing (2) and valve body (1), Valve shaft (5) and stainless steel shaft bushing (4) use bolt conjunction fixed structure, and steel bushing (2) outside is equipped with two with valve body (1) contact site The O-shaped static seal in road (12), steel bushing (2) inside and tri- dynamic sealing of valve shaft (5) contact site Gong She, together close on the inside of valve body, Using O-shaped rubber seal (11), the by-pass prot (13) of concora crush is equipped with by O-shaped rubber seal (11), together in valve body (1) On the sealing gland (6) in outside, using U-shaped polyurethane sealing ring (10), in the outside of U-shaped polyurethane sealing ring (10), if one Road combines Glais ring sealing (9), seals in U-shaped polyurethane sealing ring (10) with setting pivot between Glais ring sealing (9) is combined Leak drainage hole (14) is fixed between valve shaft (5) and pivoted arm (8) by pin, and thrust plate is equipped between pivoted arm (8) and valve body (1) (7)。

Working principle:

1, ball valve bearing is supported completely by valve body, and bearing includes copper-based mosaic self-lubricating bearing shell and puts together on valve body Bearing steel bushing, Self-lubricating bearing bush are mounted in bearing steel bushing, can be split out out of valve body with steel bushing, bearing steel cuff flange Disk fixes conjunction mode using the bolt for applying preload between steel bushing and valve body, between steel bushing and valve body not when valve rotation Relative displacement can be generated.Steel bushing and Self-lubricating bearing bush can guarantee valve shaft normal rotation when bearing the maximum radial pressure of valve shaft Without generating scratch or injurious deformation.

2, bearing uses copper-based mosaic self-lubricating bearing shell, which has good self-lubricating property, and reliable performance is rubbed It is low to wipe coefficient, compression strength is high.This will play the role of ball valve safe and reliable operation vital.

3, bearing steel bushing and pressure pad lid inside and valve shaft contact site belong to rotary movement seal, if three seals, together On the inside of close to valve body, using the whole O-shaped rubber seal of circle, inner seal mainly prevents silt dirt from entering bearing friction table Face, but water energy enters bearing surface and plays lubricating action to bearing, reduces coefficient of friction；Together on the outside of valve body, using U-shaped poly- Urethane sealing ring, inner seal side are equipped with by-pass prot, reachable using the lip for the U-shaped sealing of pressure water spreading that by-pass prot introduces To sealing effect.For the period of extend as far as possible replacement sealing, in the outside of U-shaped polyurethane sealing ring, if one group qualified Lai Quan sealing.The i.e. replaceable U-shaped polyurethane sealing ring of sealing and combination Glais ring sealing, dismounting side after sealed pressure pad lid is removed Just.Sealing structure can seal in replacement when valve bears the maximum hydraulic pressure that may occur, the main component without dismantling ball valve.Valve Locking glue is applied when sealing gland bolt is installed and installs spring washer additional, prevents ball valve long-play and vibration from keeping bolt loose It is dynamic.

4, it is equipped with the O-shaped static seal of twice with valve body contact position on the outside of steel bushing, pressure water will not enter copper-based inserted The periphery of Self-lubricating bearing bush will not occur even if the by-pass prot on copper-based mosaic self-lubricating bearing shell blocks because of copper Matrix inlaid Self-lubricating bearing bush outside pressure is excessive, and so that copper-based mosaic self-lubricating bearing shell is deformed causes to show valve shaft locking As.

5, stainless steel shaft bushing is used conjunction structure, and no matter valve body using valve or overall structure is divided, is overhauled in power station and replaced Bushing can be convenient for changing when copper-based mosaic self-lubricating bearing shell.

6, examination and maintenance for convenience, there are valve shaft infiltrations between U-shaped polyurethane sealing ring and combination Glais ring sealing Leaking drainage pipe is located at bottom, when leak occurs in sealing, can check sealing water leakage situation and leak is discharged to gutter in time.

Technical effect:

1. bearing material uses copper-based mosaic self-lubricating bearing shell, there is good self-lubricating property, reliable performance, friction Coefficient is low, and compression strength is high；

2. copper-based mosaic self-lubricating bearing shell is mounted in steel bushing, it can be split out out of valve body with steel bushing, facilitate peace Dress and replacement, use between steel bushing and valve body and conjunction mode are fixed, it is ensured that relative displacement will not occur between steel bushing and valve body；

3. valve shaft sealing structure can seal in replacement when valve bears the maximum hydraulic pressure that may occur, without dismantling ball valve Main component；

4. applying locking glue when valve shaft sealing gland bolt is installed and installing spring washer additional, ball valve long-play and vibration are prevented It is dynamic to make bolt looseness；

5. stainless steel shaft bushing is used conjunction structure, replacement can be convenient；

6. being equipped with sealing with valve body contact position on the outside of steel bushing, copper-based mosaic self-lubricating bearing shell outside pressure mistake can be prevented Greatly, so that copper-based mosaic self-lubricating bearing shell is deformed causes valve shaft locking phenomenon；

7. simple and compact for structure, installation and maintenance are convenient, and versatility is good.

Detailed description of the invention:

Fig. 1: the overall structure figure of the utility model.

Specific embodiment:

The present apparatus is a kind of power station ball valve pivot structure, generally holding type structure (as shown in Figure 1).Bearing uses copper Matrix inlaid Self-lubricating bearing bush 3, copper-based mosaic self-lubricating bearing shell 3 are mounted in bearing steel bushing 2, can be with steel bushing 2 in valve Body 1 is not understood and is split out out of valve body 1 under concrete conditions in the establishment of a specific crime.Between steel bushing 2 and valve body 1, valve shaft 5 and stainless steel shaft bushing 4 use bolt handle Structure is closed, is convenient for changing.2 outside of steel bushing is equipped with the O-shaped static seal 12 of twice, 2 inside of steel bushing and valve shaft 5 with 1 contact site of valve body Gong She tri- dynamic sealing in contact site, using O-shaped rubber seal 11, plays envelope Sha Zuoyong, O-shaped rubber together close on the inside of valve body By-pass prot 13 is equipped with by glue sealing ring 11；Together on the sealing gland 6 in the outside of valve body 1, using U-shaped polyurethane sealing ring 10, In the outside of U-shaped polyurethane sealing ring 10, if combination Glais ring sealing 9 together.In U-shaped polyurethane sealing ring 10 and the qualified Lay of group Setting pivot seals leak drainage hole 14 between circle sealing 9.Fixed between valve shaft 5 and pivoted arm 8 by pin, pivoted arm 8 and valve body 1 it Between be equipped with thrust plate 7, valve can be limited along the displacement of valve shaft axis direction.

When power station is overhauled, sealing gland 6 can be removed, replace U-shaped polyurethane sealing ring 10 and sealed with Glais ring is combined 9；After steel bushing 2 and copper-based mosaic self-lubricating bearing shell 3 are split out out of valve body 1 together, replaceable copper-based mosaic self-lubricating axis Watts 3 and stainless steel shaft bushing 4.

Although above-mentioned be described in conjunction with basic principles and main features of the attached drawing to the utility model.The skill of the industry Art personnel are all to use equivalent substitution or equivalent transformation it should be appreciated that above-described embodiment does not limit the utility model in any form The technical solution that obtains of mode, all fall within the protection scope of the utility model.

Claims (1)

1. a kind of power station ball valve pivot structure, it is characterized in that: by steel bushing (2), copper-based mosaic self-lubricating bearing shell (3), stainless Steel shaft serves as a contrast (4), sealing gland (6), thrust plate (7), combination Glais ring sealing (9), U-shaped polyurethane sealing ring (10), O-shaped rubber Sealing ring (11), O-shaped static seal (12) composition, the steel bushing (2) that copper-based mosaic self-lubricating bearing shell (3) is mounted on bearing is inner, steel It covers between (2) and valve body (1), valve shaft (5) and stainless steel shaft bushing (4) use bolt conjunction fixed structure, steel bushing (2) outside and valve Body (1) contact site is equipped with the O-shaped static seal of twice (12), moves on the inside of steel bushing (2) with valve shaft (5) contact site Gong She tri- close Envelope, using O-shaped rubber seal (11), is equipped with the bypass of concora crush together close on the inside of valve body by O-shaped rubber seal (11) Hole (13), it is close in U-shaped polyurethane using U-shaped polyurethane sealing ring (10) together on the sealing gland (6) on the outside of valve body (1) The outside of seal (10) is sealed in U-shaped polyurethane sealing ring (10) with Glais ring is combined if combination Glais ring sealing (9) together (9) pivot is set between and seals leak drainage hole (14), is fixed between valve shaft (5) and pivoted arm (8) by pin, pivoted arm (8) and valve Thrust plate (7) are equipped between body (1).