CN202597883U

CN202597883U - Improved packing structure for main water inlet valve of water turbine

Info

Publication number: CN202597883U
Application number: CN2012201665969U
Authority: CN
Inventors: 陈永金; 唐益华; 金旭; 文玉龙
Original assignee: ZIGONG GAOZHONGYA VALVE FACTORY
Current assignee: ZIGONG GAOZHONGYA VALVE FACTORY
Priority date: 2012-04-19
Filing date: 2012-04-19
Publication date: 2012-12-12
Anticipated expiration: 2022-04-19

Abstract

The improvement of the stuffing structure of the water inlet main valve of the water turbine is characterized in that it has a valve stem, the valve stem is sleeved in the stuffing box, the valve stem sleeve is provided with a sealing ring, and the compression sleeve is fixed on the stuffing box with screws and pressed tightly. The sealing ring is placed in the stuffing box, and there are two "O"-shaped sealing rings between the inner wall of the sealing ring and the valve stem. The inner wall of the sealing ring is provided with a ring groove between the two "O"-shaped sealing rings. There is a sealing packing between the compression sleeve and the valve stem, and the packing pressing plate fixed on the stuffing box with bolts presses the packing on the sealing ring. They are fixed to each other to reduce the gap, reduce friction, and increase the service life of the packing. In this way, the double seal combined with the sealing ring and the traditional packing can effectively avoid the burning of the shaft, the difficulty of valve switching, and the frequent replacement of packing after long-term operation of the valve. question.

Description

The improvement of hydroturbine water intake main valve filling-material structure

Technical field

The utility model relates to the hydroturbine water intake main valve, relates in particular to the improvement of hydroturbine water intake main valve filling-material structure.

Background technique

At present; Valve is widely used in systems such as metallurgy, electric power, petrochemical industry, municipal administration and plumbing as Flow-rate adjustment and shut-off means; And most important component is a filling-material structure in the valve; Whether filling-material structure seals the complexity that directly affects valve opening and the working life of valve rod; Present stage, employed filling-material structure was the conventional construction (see figure 1), mainly was made up of Stuffing box 18, expanded graphite packing 19, filler gland 20, hold-down grid 21, follower bolt 22, valve rod 23, gland nut 24, Packing seat 25.Expanded graphite packing is packed Stuffing box into after the gland screw is made axial compression to it, when valve rod and filler have relative movement, because the plasticity of filler; Make it produce radial force, and closely contact, meanwhile with valve rod; The oiling agent that floods in the filler is extruded, and between surface of contact, forms oil film.Because contact condition is not uniform especially, " boundary lubrication " state just appears in the contact position, is called " bearing effect "; And the recess of contact does not form little oil groove; Thicker oil film is arranged, and irregular labyrinth is formed with the non-contact position in the contact position, plays a part to stop flow to leak; Reach the effect of sealing; This claims " labyrinth effect ", and in sum, good sealing is to keep " bearing effect " and " labyrinth effect "; That is to say and want to reach sealing effect well, keep good lubricated and suitable compressing, if insufficient lubrication, or press to such an extent that tension all can make oil film interrupt, cause to occur dry friction between filler and the valve rod, cause excessively heated axle at last and heavy wear occurs.For fear of the problems referred to above, need often the compressing degree of filler to be adjusted, so that the oiling agent in the filler is after the loss of operation a period of time; Extrude some oiling agents again; It is lax because of the impacting force that change in volume caused to compensate filler simultaneously, still, and so frequent extruding filler; Make impregnating agent exhausted the most at last, so must regularly replace filler.In the application of large bore valves, because the diameter of valve rod is bigger, the size of filler is also big, filler group number is many, simultaneously; Needed impacting force is also bigger, and equipment operation is after a period of time, and the oiling agent in the filler runs off gradually; Need strengthen the impacting force of filler this moment again, after impacting force strengthened, the frictional force of valve rod rotation also strengthened thereupon; Possibly cause the valve opening difficulty, such filler maintenance and replacing are all compared frequent, can cause unnecessary economic loss.

Summary of the invention

The purpose of the utility model provides a kind of improvement of hydroturbine water intake main valve filling-material structure; Its purpose is to solve the existing technology problem; Providing a kind of can use on the valve rod of large bore valves; And have good sealing effect, the excessively heated axle that can effectively avoid occurring after the valve long-time running, valve closing difficulty, filler are changed the filling-material structure of problem such as frequent.

The technological scheme of the employing of the utility model is:

The improvement of hydroturbine water intake main valve filling-material structure; It is characterized in that: have valve rod, valve stem casing is located in the Stuffing box, and valve stem casing is provided with seal ring; Clamping sleeve is installed on the Stuffing box with screw; And compress seal ring in Stuffing box, and being provided with two " O " RunddichtringOs between the inwall of seal ring and the valve rod, the inwall of seal ring is provided with a circle annular groove between said two " O " RunddichtringOs; Be provided with stuffing box packing between clamping sleeve and the valve rod, the hold-down grid that is installed on the Stuffing box with bolt is pressed in filler on the seal ring.

Said clamping sleeve is for falling " L " type.

Said hold-down grid is made up of the transverse slat of filler gland and hold-down grid, and the filler gland is pressed on the filler, and the transverse slat of hold-down grid is pressed on the filler gland and with bolt and is installed on the Stuffing box.

Said filler is three layers, is shaped as down " V " type.

The good effect of the utility model is: the utility model seal ring is to utilize to block the throttling sealing; The inwall of seal ring is provided with two " O " RunddichtringOs; When following " O " RunddichtringO took place to leak, in the annular groove about medium flows between " O " RunddichtringO, the interior pressure medium of annular groove this moment obtained discharging; Above " O " RunddichtringO just can seal fully; After two " O " RunddichtringOs all lost efficacy because of mechanical wear, had the leakage of trace, refilling traditional filler on the seal ring, because the pressure of the traditional filler device medium of the pressure ratio of the interaction medium of seal ring is much smaller; So need also can reduce greatly to the impacting force of filler; When reducing, impacting force also reduced the frictional force of filler and valve rod, because the PTFE material has corrosion-resistant, ageing-resistant, the low coefficient of friction and the characteristic of wide, the good springiness of viscosity, temperature resistant range not, so filler uses the PTFE material; Can further address the above problem, excessively heated axle, valve switch difficulty, filler that the double seal of adopting seal ring to combine with conventional filler has like this effectively been avoided occurring after the valve long-time running are changed problems such as frequent." V " type that is shaped as down of filler can better make to interfix between the filler and reduce the slit, reduces friction, increases the working life of filler.

Description of drawings

Fig. 1 is the conventional filler structural representation;

Fig. 2 is the utility model cross-sectional view.

Among the figure: 1, valve rod; 2, Stuffing box; 3, seal ring; 4, " O " RunddichtringO A; 5, " O " RunddichtringO B; 6, " O " RunddichtringO C; 7, middle annular groove; 8, go up filler; 9, middle filler; 10, following filler; 11, screw; 12, fall " L " type clamping sleeve; 13, fall " L " type filler gland; 14, the transverse slat of hold-down grid; 15, follower bolt; 16, panel nut; 17, filler; 18, Stuffing box; 19, expanded graphite packing; 20, filler gland; 21, hold-down grid; 22, follower bolt; 23, valve rod; 24, gland nut; 25, Packing seat.

Embodiment

Below in conjunction with accompanying drawing and specific embodiment the utility model is described further.

As shown in Figure 2, the improvement of hydroturbine water intake main valve filling-material structure has valve rod 1; Valve rod 1 is set in the Stuffing box 2, and seal ring 3 passes valve rod 1 and is installed on the bottom in the Stuffing box 2, and the outer side wall of seal ring 3 links to each other with the madial wall of Stuffing box 2; The madial wall of seal ring 3 links to each other with the outer side wall of valve rod 1, and the madial wall of seal ring 3 is provided with three circle annular grooves, is respectively annular groove (figure does not show); Middle annular groove 7, following annular groove (figure does not show) is clogged " O " RunddichtringO A4 and " O " RunddichtringO B5 up and down respectively in the annular groove; The middle part of the outer side wall of seal ring 3 also is provided with a circle annular groove (figure does not show), filling " O " RunddichtringO C6 in the annular groove, and the top of seal ring 3 is provided with down " L " type clamping sleeve 12; " L " type clamping sleeve 12 that falls is set in outside the valve rod 1, and the madial wall of the outer side wall of " L " type clamping sleeve 12 and Stuffing box 2 coincide, and is fixing with Stuffing box 2 through screw 11; Fall that filling has filler 17 between " L " type clamping sleeve 12 and the valve rod 1, filler 17 minutes is respectively filler 8, middle filler 9, time filler 10 for three layers, and filler 17 places the top of seal ring 3; The top of filler 17 is provided with down " L " type filler gland 13; " L " type filler gland 13 that falls is set in outside the valve rod 1, and the madial wall of " L " type filler gland 13 and the outer side wall of valve rod 1 join, and the top of " L " type filler gland 13 is provided with the transverse slat 14 of hold-down grid; The transverse slat 14 of hold-down grid is set in outside the valve rod 1; The madial wall of the transverse slat 14 of hold-down grid and the outer side wall of valve rod 1 join, and the upper surface of transverse slat 14 far-ends of hold-down grid is provided with follower bolt 15, through follower bolt 15 with link to each other with Stuffing box 3 with its supporting panel nut 16.

The double seal that this structure adopts seal ring to combine with conventional filler; The seal ring 3 of bottom is a primary seal; The filler 17 on top is sealed into auxiliary seal, and seal ring 3 passes valve rod 1 and is installed on the bottom in the Stuffing box 2, and the interior outer side wall of seal ring 3 is clogged " O " RunddichtringO A4, " O " RunddichtringO B5, " O " RunddichtringO C6 respectively; With the inner high-pressure medium of this sealed valve; For prevention valve rod 1 seal ring 3 when rotating also and then rotates, use " L " type clamping sleeve 12 that seal ring 3 is compressed, " L " type clamping sleeve 12 that falls is fixing with Stuffing box 2 through screw 11; And regulate the elasticity that 12 pairs of seal rings 3 of " L " type clamping sleeve compress through screw 11, to reach the effect of sealing.

Last filler 8, middle filler 9, filler 10 is installed on down between " L " type clamping sleeve 12 and the valve rod 1 down; The endoporus of each filler all cooperates with valve rod 1; Last filler 8, middle filler 9, filler 10 is combined into filler 17 down, and the top of filler 17 is provided with down " L " type filler gland 13, and the top of " L " type filler gland 13 is provided with the transverse slat 14 of hold-down grid; The transverse slat 14 of hold-down grid is set in outside the valve rod 1; Its madial wall links to each other with the outer side wall of valve rod 1, and the upper surface of transverse slat 14 far-ends of hold-down grid is provided with follower bolt 15, through follower bolt 15 with link to each other with Stuffing box 3 with its supporting panel nut 16; Reach through falling the compressing of 13 pairs of fillers 17 of " L " type filler gland with the elasticity of regulating panel nut 16, thereby play the effect of sealing.

Seal ring 3 utilization is blocked the throttling sealing principles, is provided with 2 " O " RunddichtringOs at the madial wall of seal ring 3 and is respectively " O " RunddichtringO A4 and " O " RunddichtringO B5, and the material of " O " RunddichtringO is a fluorine rubber; Because fluorine rubber has characteristics such as high temperature resistant, high elasticity; So using " O " RunddichtringO is a kind of extrusion pressing type sealing, the basic functional principle of extrusion pressing type sealing is to rely on Sealing generation resiliently deformable, on sealing contact surface, causes contact pressure; Contact pressure is greater than the interior pressure of sealed medium; Then do not leak, when " O " RunddichtringO B5 wearing and tearing elasticity reduces, can leak, the inner high-pressure medium of sealed valve this moment flows in the middle annular groove 7 on seal ring 3 madial walls; The pressure of sealed valve inner high voltage medium obtains discharging; Make the contact pressure of the interior pressure of sealing medium less than " O " RunddichtringO A4 and valve rod 1, " O " RunddichtringO A4 seals fully, and valve normally moves.

When " O " RunddichtringO A4 and " O " RunddichtringO B5 occur after the seal failure of mechanical wear flexibility decrease micro-leakage being arranged because use for a long time; The effect of secondary seal (auxiliary seal) has just been played in the sealing of the conventional filler of setting on seal ring 3; Know that according to blocking the throttling sealing principle pressure medium that this moment, seal ring 3 leakages were come is also lower, so the also big size of impacting force that needs; After impacting force reduces; The outer side wall of valve rod 1 and the frictional force between the filler 17 have also been reduced simultaneously, because that the PTFE material has is corrosion-resistant, ageing-resistant, low coefficient of friction and the characteristic of wide, the good springiness of viscosity, temperature resistant range not, so filler 17 use PTFE materials; Last filler 8, middle filler 9, the shape of filler 10 is made down " V " type and can better be made to interfix between the filler and reduce the slit down; Reduce friction, increase the working life of filler 17, excessively heated axle, valve closing difficulty, the filler effectively having avoided occurring after the valve long-time running are changed problems such as frequent.

Claims

1. The improvement of the filling structure of the water inlet main valve of the water turbine is characterized in that it has a valve stem, the valve stem is sleeved in the stuffing box, the valve stem sleeve is provided with a sealing ring, the compression sleeve is fixed on the stuffing box with screws, and Compress the sealing ring in the stuffing box, there are two "O" type sealing rings between the inner wall of the sealing ring and the valve stem, and a ring ring is arranged between the two "O" type sealing rings on the inner wall of the sealing ring There is a sealing packing between the compression sleeve and the valve stem, and the packing pressing plate fixed on the stuffing box with bolts presses the packing on the sealing ring.

2. The improvement of the packing structure of the water turbine inlet main valve according to claim 1, characterized in that the compression sleeve is an inverted "L" shape.

3. The improvement of the packing structure of the main water inlet valve of a water turbine as claimed in claim 1, wherein the packing pressure plate is composed of a packing gland and a horizontal plate of the packing pressure plate, the packing pressure sleeve is pressed on the packing, and the horizontal plate of the packing pressure plate It is pressed on the packing gland and fixed on the stuffing box with bolts.

4. The improvement of the packing structure of the water turbine inlet main valve according to claim 1, characterized in that: the packing has three layers, and the shape is inverted "V".