CN203453526U

CN203453526U - Hard seal butt clamp ball valve

Info

Publication number: CN203453526U
Application number: CN201320377126.1U
Authority: CN
Inventors: 陈占基; 杨铭
Original assignee: ZHEJIANG HUAXIA VALVE CO Ltd
Current assignee: ZHEJIANG HUAXIA VALVE CO Ltd
Priority date: 2013-06-28
Filing date: 2013-06-28
Publication date: 2014-02-26
Anticipated expiration: 2023-06-28

Abstract

Disclosed is a hard seal butt clamp ball valve. The ball valve comprises a valve body, a valve cover, a metal valve seat disposed inside the valve body, a ball disposed on the metal valve seat and a handle. A valve body gasket is disposed at a connection part of the valve body and the valve cover. A valve seat seal washer and a valve seat support washer are disposed at the connection part of the valve cover and the metal valve seat. The valve seat support washer is provided with a disk spring. The handle is connected with the ball through a valve rod that passes through the sidewall of the valve body. The valve body gasket is a microcosmic toothed ring seal butt structure. The valve utilizes triangle sleeve sealing, valve rod ball wedge reverse sealing and the microcosmic toothed ring seal butt structure, thereby achieving small seal size, high efficiency and more reliable sealing performance. Furthermore, a handle lock platform is in threading connection with a driver installation platform, so that manufacture cost of the valve is greatly reduced.

Description

Hard sealing is to folder ball valve

Technical field

The utility model belongs to mechanical engineering accessory technical field, and what be specifically related to is that a kind of hard sealing is to folder ball valve.

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.

Undesirable because of the sealing configuration existence sealing of existing valve mechanism, 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, and is used as the hard sealing of fluid containment part to folder ball valve.

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 the surface geometry error that car boring processing causes; 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 consists 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; 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, by projection, convert other direction to, by Poisson's ratio, convert the Sealing Stress of orthogonal direction to; 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: during 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, if use pad, 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; 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 that along the key that pads the leakage of material internal channel each pads microgap mouth in material to giving enough pressure stress fully to close to pad simultaneously, 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 to surface, be subject to the extruding of same degree simultaneously and effectively close each road leakage way its each, in other words, only have closed compression sealing gasket just likely to make pad its each, to surface, be subject to the crowded cash of same degree simultaneously and effectively close the leakage way that medium penetrates pad material along leakage way and the medium of sealing surface simultaneously; 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: hard sealing, to folder ball valve, is comprised of valve body, valve gap, the metal seat valve that is located at valve inner, spheroid and the handle being located on metal seat valve; It is characterized in that: the joint of valve body and valve gap is provided with valve seal pad, the joint of valve gap and metal seat valve is provided with valve seat insert and valve seat bracing ring, on this valve seat bracing ring, is also provided with belleville spring; Handle couples together by valve rod and spheroid, and this valve rod is the sidewall that runs through valve body, and valve rod back seal place is spherical structure.

Described valve seal pad is sealing butt-joint structure of microcosmic saw-tooth ring, because the initial contact of sealing butt-joint structure of microcosmic saw-tooth ring is line contact, material is harder, area of contact more approaches zero, therefore, can say, no matter how how hard by force material is, docking structure is contacted and is realized the required active force of initial sealing all as the soft material by line, all can be as small as and ignores; That is to say, no matter material is hard or soft, as long as apply microcosmic saw-tooth ring sealing configuration in good time, any docking structure is to realize that part of required power of initial sealing all can accomplish to ignore, or any docking structure is realized the necessary minimum Sealing Stress y of sealing and all can be accomplished to ignore during without pressure medium.

Described valve rod and body wall joint are provided with successively valve stem seal pad, three point arbitrage and sealed pressing sleeve and seal completely, are also provided with anti-static device; This valve stem seal pad is specifically located at the joint of valve rod and valve body madial wall, and three point arbitrage and sealed pressing sleeve are specifically located at the joint of valve rod and valve body outer side wall.

Described valve rod is ball wedge structure.

Described valve stem seal pad is inclined-plane wedge-like structure.

The benchmark architecture in described metal seat valve cross section is equilateral triangle.

The beneficial effects of the utility model embody and are: compared with prior art, the utility model, owing to adopting three point arbitrage sealing, valve rod ball wedge back seal and sealing butt-joint structure of microcosmic saw-tooth ring, makes sealed volume little, and efficiency is high, and sealability is more reliable; Handle locking platform adopts and is threaded 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 the utility model cross section structure schematic diagram.

Following is the concrete title of each sign in figure: 1 valve body, 2 valve seal pads, 3 metal seat valves, 4 valve seat inserts, 5 valve seat bracing rings, 6 belleville springs, 7 valve gaps, 8 spheroids, 9 anti-static devices, 10 valve rods, 11 valve stem seal pads, 12 three point arbitrages, 13 sealed pressing sleeves, 14 handles.

Embodiment

As shown in Figure 1, hard sealing is comprised of valve body 1, valve gap 7, the metal seat valve 3 that is located at valve body 1 inside, spheroid 8 and the handle 14 being located on metal seat valve 3 folder ball valve; Valve body 1 is provided with valve seal pad 2 with the joint of valve gap 7, and valve gap 7 is provided with valve seat insert 4 and valve seat bracing ring 5 with the joint of metal seat valve 3, on this valve seat bracing ring 5, is also provided with belleville spring 6; Handle 14 couples together by valve rod 10 and spheroid 8, and this valve rod 10 is the sidewalls that run through valve body 1, and valve rod back seal place is spherical structure.

Described valve seal pad 2 is sealing butt-joint structure of microcosmic saw-tooth ring; This sealing butt-joint structure of microcosmic saw-tooth ring can be suitable as various surfaces, as plane and plane, and the conical surface and the conical surface or sphere, the Butt sealing structure of sphere and sphere or the conical surface etc.; In fact, as long as on the slightly protruding face that has docking saw-tooth ring structure, by the surface shape error profile wave height due to machine tool guideway parallelism and perpendicularity and workpiece deformation, be not more than the surface waviness profile unit height due to cutting vibration and be not more than the surface roughness profile unit height due to cutting edge mark, so, all reliable slightly large microcosmic saw-tooth ring of tooth depth sealings that achieves a butt joint of all surface docking.

Described valve rod 10 is provided with successively valve stem seal pad 11, three point arbitrage 12 and sealed pressing sleeve 13 with valve body 1 sidewall joint and seals completely, is also provided with anti-static device 9; This valve stem seal pad 11 is specifically located at the joint of valve rod 10 and valve body 1 madial wall, and three point arbitrage 12 and sealed pressing sleeve 13 are specifically located at the joint of valve rod 10 and valve body 1 outer side wall.

Described valve stem seal pad 11 is inclined-plane wedge-like structure, has effectively improved the reliability of sealing.

The benchmark architecture in described metal seat valve 3 cross sections is equilateral triangle, the task of metal seat valve 3 has been that switch spheroid 8 docks with the oblique angle of valve body 1, therefore, 3 at least three surfaces at an angle to each other of metal seat valve: one to the sealing surface of switch spheroid, one to the sealing surface of valve body and an equilibrium of forces supporting surface of asking valve body; Its three of this equilateral triangle section valve seats equate stressed and not etc. lifting surface area (because of turning radius difference) just in time expire ideally in the demand of each face unequal stress, the ball sealing surface that stress is slightly large just in time meets its motive sealing to ball, the body sealing surface that stress is slightly little just in time meets its static seal to body, and stress more slightly little supporting surface just in time meets its slip on supporting ring; Moreover, only have equilateral triangle cross section just can avoid valve seat to occur being less than the weak wedge angle of 60 degree; Therefore, must to meet equilateral triangle be cross section to valve seat.

Claims

1. hard sealing, to folder ball valve, is comprised of valve body, valve gap, the metal seat valve that is located at valve inner, spheroid and the handle being located on metal seat valve; It is characterized in that: the joint of valve body and valve gap is provided with valve seal pad, the joint of valve gap and metal seat valve is provided with valve seat insert and valve seat bracing ring, on this valve seat bracing ring, is also provided with belleville spring; Handle couples together by valve rod and spheroid, and this valve rod is the sidewall that runs through valve body, and valve rod back seal place is spherical structure; Valve seal pad is sealing butt-joint structure of microcosmic saw-tooth ring.

2. hard sealing according to claim 1, to folder ball valve, is characterized in that: described valve rod and body wall joint are provided with successively valve stem seal pad, three point arbitrage and sealed pressing sleeve and seal completely, are also provided with anti-static device; This valve stem seal pad is specifically located at the joint of valve rod and valve body madial wall, and three point arbitrage and sealed pressing sleeve are specifically located at the joint of valve rod and valve body outer side wall.

3. hard sealing according to claim 2, to folder ball valve, is characterized in that: valve stem seal pad is inclined-plane wedge-like structure.

4. hard sealing according to claim 1, to folder ball valve, is characterized in that: the benchmark architecture in metal seat valve cross section is equilateral triangle.