CN203604671U

CN203604671U - High-pressure thread connection Y-type stop valve for power station

Info

Publication number: CN203604671U
Application number: CN201320657444.3U
Authority: CN
Inventors: 陈占基; 杨铭
Original assignee: DONGTOU HUAXIA VALVE Co Ltd
Current assignee: DONGTOU HUAXIA VALVE Co Ltd
Priority date: 2013-10-24
Filing date: 2013-10-24
Publication date: 2014-05-21
Anticipated expiration: 2023-10-24

Abstract

The utility model provides a high-pressure thread connection Y-type stop valve for a power station. The high-pressure thread connection Y-type stop valve for the power station is composed of a valve body, a valve deck, a valve clack arranged in the valve body, a valve rod connected with the valve clack, a gland arranged on the valve rod in a sleeved mode and a hand wheel. A valve rod ball wedge back-sealing structure is arranged in the position of connection between the valve body and the valve deck, and a ball wedge sealing structure is arranged in the position of connection between the valve body and the valve clack. Because the valve rod ball wedge back-sealing structure and the ball wedge sealing structure are adopted for the stop valve, the stop valve is small in sealed size, high in efficiency and more reliable in sealing performance.

Description

The high pressure Y-shaped cut-off valve that is threaded for power station

Technical field

The utility model belongs to mechanical engineering accessory technical field, and what be specifically related to is a kind of power station high pressure Y-shaped cut-off valve that is threaded.

Background technique

Valve is that fluid is carried and the switch of controlling, and all valves have a switch gear, as the ball in ball valve, and the flashboard in gate valve, the flap in stop valve; Valve opening/closing device is arranged in the fluid passage of valve body, has open position and a closed position that stops fluid to pass that allows fluid to pass, and it closes and realize by valve rod from closing to the motion of opening from reaching; Valve rod is all to pass through in vitro handle or pneumatic head or electrical header to handle; Valve rod is external from reaching in valve body or valve gap, needs strict sealing, the closing structure of switch gear or the connection of passage or fixingly also need strict sealing.

Because the sealing configuration of existing valve mechanism exists sealing undesirable, sealingly secure hidden danger is people's urgent problem always, and this case is raw therefrom.

Summary of the invention

The purpose of this utility model is the deficiency for above technology, and a kind of simple and effective temperature correction sealing configuration is provided, as the high pressure Y-shaped cut-off valve that is threaded for the power station of fluid containment part.

Because considering that the task of sealing is fill up butting surface rough and uneven in surface, sealing butting surface is generally all processed by car borer skill, and therefore, the task of sealing is to fill up car boring to process the surface geometry error causing; Machining surface gemoetric error has three kinds of surface roughness, external waviness and surface shape errors; Surface roughness is the surface microscopic gemoetric error of the profile unit width narrower (or wavelength is shorter) that is made up of cutting edge mark, the <50 of its profile unit (width XS/ height Zt); Surface waviness is the surface microscopic gemoetric error of the profile unit's width slightly wide (or wavelength is slightly long) due to processing vibration ,=the 50-1000 of its profile unit (width XS/ height Zt); Surface shape error is that machine tool guideway or workpiece are installed the surperficial macroscopical gemoetric error of profile unit's wider width (or wavelength is longer) due to clamping, the >1000 of its profile unit (width XS/ height Zt); The surface shape error wavelength that seal f ace width causes much smaller than machine tool guideway parallelism and perpendicularity, is reflected in and can ignores to the surface shape error on front cover, and the surface shape error that workpiece is installed due to clamping should and can be avoided; Common car boring manufacturing process belongs to slightly meticulous machining category, needs to use slightly high spindle speed and slightly thin feed speed, and the wavelength of the surface waviness due to vibration is shorter, and the wavelength of the roughness of sword mark formation is shorter; What therefore sealing will be filled up is the rough and uneven in surface of microcosmic surface waviness finer and smoother on butting surface and roughness magnitude.

Because conventional sealing material is in certain normal temperature scope, other material is at certain high temperature range, nearly all that the mutual not stall in crystal region and amorphous tagma is changed and the viscoelastic material coexisting, and crystal region causes the aobvious solidified phase characteristics of material, has intensity and rigidity, amorphous tagma causes material aobvious liquid phase characteristics, toughness and elasticity; The mobility of liquid phase ingredient can cause the pressure of sealing gasket to transmit isotropy, and no matter medium acting surface is parallel or vertical with sealing surface, all likely pad surface pressure is converted to totally to the sealing load of sealing surface; The volume invariability of liquid phase ingredient can cause the sealing gasket in die compaction, as the hydraulic oil in oil cylinder, as long as there is superpower anti-pressure ability--and it is enough little to extrude gap, just will never be racked; The viscosity of liquid phase ingredient can cause sealing gasket response lag stress, or it is lax or cause sealing gasket cold flow to cause padding Sealing Stress, causes seal failure; The viscosity of liquid phase ingredient also can cause the pressure transmission of sealing gasket highly to be successively decreased; The steadiness of solid phase composition can cause the compressive stress of sealing gasket, at the most can only be by Poisson's ratio and Hooke's law, reduce by half and convert the extension stress (because the Poisson of conventional sealing material system is less than 0.5) on its orthogonal direction to, therefore, likely can only be by the surface pressure of selfsealings pad, convert other direction to, convert the Sealing Stress of orthogonal direction by Poisson's ratio to by projection; So, the softer resilient rubbber cushion of quality almost can be by liquid transfering pressure, the hard pad of quality almost can only be by solid Poisson's ratio and vector transmission of pressure, the medium teflon pad of quality soft or hard can be pressed in liquid phase, macroscopic view and press solid phase transmission of pressure before surrender on microcosmic, can after surrender, in macroscopic view, press liquid phase transmission of pressure.

The structural principle of sealing is, during without pressure medium, structure realizes the necessary minimum nominal stress y of initial sealing should be enough little, little when having pressure medium, the sealing of structure maintains coefficient or anti-interference Coefficient m (the seal action power FS/ medium of=structure removes seal action power Fu) is meaningful, be little when having pressure medium, the sealing of structure is determined by m: when m=1, seal action power (the FS)=medium-tight active force (Fu) of structure, structure is in sealing and non-tight threshold state, m is a bit larger tham 1 o'clock, structure seals the state of maintaining, m is larger than 1, the ability that structure maintains sealing is stronger, reliability is higher, that is to say that the little m when having pressure medium of y value when design of Sealing Structure is first to make it without pressure medium is meaningful, then make its m>1.

As previously mentioned, without saw-tooth ring docking, because pad is softer than docking metal, therefore, generally all can realize initial sealing by bearing that part of prefastened power of maximal work pressure if use pad; So any sealing docking structure, as long as appropriate application microcosmic saw-tooth ring and cushion, all can maintain coefficient or anti-interference Coefficient m (medium on the seal action power FS/ sealing surface of=structure removes seal action power Fu) is greater than 1 design and examination by sealing.

Basic sealing structure for trough pad, softer than docking metal surface material as the nonmetallic material of pad sealing, be easy to eliminate the original leakage of docking metal surface, but but bring docking new leakage--along the leakage that penetrates of microgap in pad material; No matter be motive sealing or static seal, effectively stop the key that medium leaks along sealing surfaces passage to be to give enough contact pressure stress so that pad material is fully filled up the rough and uneven in surface of butting surface to pad sealing surface, effectively stop medium to be along the key of pad material internal channel leakage simultaneously each to giving enough pressure stress fully to close microgap mouth in pad material to pad, and do not mind that extruding force is from interface or pressure medium; Because the transmission of power in viscous liquid material successively decreased, the transmission of power in elastic solid material is to have in length and breadth other, therefore, the open compression of the sealing gasket that solid phase under normal temperature and liquid phase are coexisted can not make pad respectively be subject to the extruding of same degree to surface simultaneously and effectively close each road leakage way at it, in other words, only have closed compression sealing gasket just likely to make pad respectively be subject to the crowded cash of same degree to surface simultaneously and effectively close medium simultaneously and penetrate along the leakage way of sealing surface and medium the leakage way of pad material at it; In addition, sealing material in closed compression, just as the hydraulic oil in oil hydraulic cylinder, as long as enough little between extruding, just will never be racked, therefore, can say, no matter optimal pad sealing configuration, be by mechanical force being installed or compressing by pressure medium, should be all the sealing structure for trough pad that pad is subject to closed compression.

The utility model is achieved through the following technical solutions: the high pressure Y-shaped cut-off valve that is threaded for a kind of power station, its by valve body, valve gap, be located at the flap of valve inner, the valve rod being connected with flap, gland and the handwheel being enclosed within on valve rod form; The joint of this valve body and valve gap is provided with valve rod ball wedge back seal structure, and the joint of this valve body and flap is provided with ball wedge sealing configuration.

Between described valve gap and a Gland, be provided with filler, Gland is connected with hold-down grid, and valve gap is connected with one end of a double-screw bolt, and hold-down grid is connected with the other end of double-screw bolt; Double-screw bolt is connected with a nut thread.

The back seal place of described valve rod is spherical structure.

The top of described valve rod is connected with a locking nut.

The beneficial effects of the utility model embody and are: compared with prior art, the utility model, owing to adopting valve rod ball wedge back seal structure and ball wedge sealing configuration, makes sealed volume little, and efficiency is high, and sealability is more reliable; Locking platform adopts flange to be connected with driver mountion plate in addition, and this will reduce the manufacture cost of valve greatly.

Accompanying drawing explanation

Below in conjunction with accompanying drawing, the utility model is described in detail.

Fig. 1 is cross section structure schematic diagram of the present utility model.

Embodiment

As shown in Figure 1, the high pressure Y-shaped cut-off valve that is threaded for power station, by valve body 1, valve gap 3, be located at the flap 2 of valve body 1 inside, the valve rod 9 being connected with flap 2, gland 10 and the handwheel 11 being enclosed within on valve rod 9 form; This valve body 1 is provided with valve rod ball wedge back seal structure 14 with the joint of valve gap 3, and this valve body 1 is provided with ball wedge sealing configuration 13 with the joint of flap 2.

Between valve gap 3 and a Gland 5, be provided with filler 4, Gland 5 is connected with hold-down grid 7, and valve gap 3 is connected with one end of a double-screw bolt 6, and hold-down grid 7 is connected with the other end of double-screw bolt 6; Double-screw bolt 6 is threaded with a nut 8.

The back seal place of valve rod 9 is spherical structure.The top of valve rod 9 is connected with a locking nut 12.

The utility model, owing to adopting valve rod ball wedge back seal structure and ball wedge sealing configuration, makes sealed volume little, and efficiency is high, and sealability is more reliable.

Above-described specific embodiment; technical problem, technological scheme and beneficial effect to solution of the present utility model further describe; institute is understood that; the foregoing is only specific embodiment of the utility model; be not limited to the utility model; all within spirit of the present utility model and principle, any modification of making, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.

Claims

1. the high pressure Y-shaped cut-off valve that is threaded for power station, is characterized in that: its by valve body, valve gap, be located at the flap of valve inner, the valve rod being connected with flap, gland and the handwheel being enclosed within on valve rod form; The joint of this valve body and valve gap is provided with valve rod ball wedge back seal structure, and the joint of this valve body and flap is provided with ball wedge sealing configuration.

2. the high pressure Y-shaped cut-off valve that is threaded for power station according to claim 1, it is characterized in that: between described valve gap and a Gland, be provided with filler, Gland is connected with hold-down grid, and valve gap is connected with one end of a double-screw bolt, and hold-down grid is connected with the other end of double-screw bolt; Double-screw bolt is connected with a nut thread.

3. the high pressure Y-shaped cut-off valve that is threaded for power station according to claim 1, is characterized in that: the back seal place of described valve rod is spherical structure.

4. the high pressure Y-shaped cut-off valve that is threaded for power station according to claim 1, is characterized in that: the top of described valve rod is connected with a locking nut.