CN203348617U - One-piece-type threaded-connection forged steel floating ball valve - Google Patents

Abstract

A one-piece-type threaded-connection forged steel floating ball valve comprises a valve body, a valve cover, a ball body, a valve base arranged in the valve body and a handle. The connection portion of the valve body and the valve cover is provided with a valve body sealing pad, the connection portion of the valve body and the valve cover is of a microcosic zigzag-ring butt-joint structure, and the handle is connected with the ball body through a valve rod. Due to triangular sleeve sealing, valve rod ball wedge back sealing and the microcosic zigzag-ring sealing butt-joint structure, the sealing size is small, efficiency is high, and sealing performance is more reliable.

Description

The single piece type forged steel floating ball valve that is threaded

Technical field

The utility model belongs to mechanical engineering accessory technical field, and what be specifically related to is a kind of single piece type forged steel floating ball 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, and an open position that allows fluid to pass and a closed position that stops fluid to pass are arranged, 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 given birth to 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, the single piece type connected as the binding thread of the fluid containment part forged steel floating ball valve that is threaded.

Because considering that the task of sealing is fill up butting surface rough and uneven in surface, the 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; The 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 the cutting edge mark, its profile unit (width XS/ height Zt)<50; Surface waviness is the surface microscopic gemoetric error of the profile unit's width slightly wide (or wavelength is slightly long) due to the processing vibration, its profile unit (width XS/ height Zt)=50-1000; 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, its profile unit (width XS/ height Zt) > 1000; The surface shape error wavelength that seal f ace width causes much smaller than machine tool guideway parallelism and perpendicularity, be reflected in and can ignore 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.

Due to sealing material commonly used 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 coexisted, and crystal region causes the aobvious solidified phase characteristics of material, intensity and rigidity are arranged, the 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 the medium acting surface is parallel or vertical with sealing surface, all likely will pad the sealing load that surface pressure is converted to sealing surface totally; 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 superpower anti-pressure ability is arranged--and it is enough little to extrude gap, just will never squeezedly break; The viscosity of liquid phase ingredient can cause sealing gasket response lag stress, or it is lax or cause the 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, convert the extension stress (because the Poisson of sealing material commonly used system is less than 0.5) on its orthogonal direction to with reducing by half, 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 on liquid phase, macroscopic view and press the solid phase transmission of pressure before surrender on microcosmic, can after surrender, on macroscopic view, press the liquid phase transmission of pressure.

The structural principle of sealing is, during without pressure medium, structure realizes that the necessary minimum nominal stress y of initial sealing should be enough little, it is little when pressure medium is arranged, 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 pressure medium is arranged, the sealing of structure is determined by m: during m=1, the seal action power (FS) of structure=medium-tight active force (Fu), 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 pressure medium is arranged of y value when design of Sealing Structure is at first to make it without pressure medium is meaningful, then make its m 1.

As previously mentioned, without the saw-tooth ring docking, soft than the docking metal due to pad if use pad, therefore, generally all can realize by that part of prefastened power of bearing maximal work pressure initial sealing; 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 the pad material; No matter be motive sealing or static seal, effectively stop the key that medium leaks along the sealing surfaces passage to be to give enough contact pressure stress so that the pad material is fully filled up the rough and uneven in surface of butting surface to the 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; Transmission due to power in viscous liquid material is successively decreased, the transmission of power in elastic solid material is that other is arranged in length and breadth, therefore, the open compression of the sealing gasket that solid phase under normal temperature and liquid phase are coexisted can not make pad be subject to the extruding of same degree to surface simultaneously and effectively close each road leakage way its each, in other words, only have the closed compression sealing gasket just likely to make pad be subject to the crowded cash of same degree to surface its each simultaneously and effectively close the leakage way that medium penetrates the 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 squeezedly break, 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 single piece type forged steel floating ball valve that is threaded is comprised of valve body, valve gap, spheroid, the valve seat that is located at valve inner, handle; It is characterized in that: the joint of valve body and valve gap is provided with the valve seal pad, valve body and valve gap connection part are sealing butt-joint structure of microcosmic saw-tooth ring, described handle is connected with spheroid by a valve rod, and valve rod and body wall joint are provided with the valve stem seal pad and three point arbitrage seals fully; The top of three point arbitrage is provided with sealed pressing sleeve.

Described valve seal pad is set to sealing butt-joint structure of microcosmic saw-tooth ring, because the initial contact of sealing butt-joint structure of microcosmic saw-tooth ring is the 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 contacts and realizes that the required active force of initial sealing all as the soft material, all can be as small as and ignores by line; That is to say, no matter material is hard or soft, as long as apply the 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 realizes that the necessary minimum Sealing Stress y of sealing all can accomplish to ignore during without pressure medium.

Because three point arbitrage directly is subject to radial pressure and highly symmetrically, therefore, have that leakage efficiency is high, Compensation Regulation is sensitive, the wear-resisting characteristics such as lasting.

Be provided with a belleville spring between described sealed pressing sleeve and handle, valve rod is connected with a nut.

The benchmark architecture in described valve seat 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; The handle locking platform adopts and is threaded with the driver mountion plate in addition, and this will reduce the manufacture cost of valve greatly.

The 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.

Embodiment

As shown in Figure 1, the single piece type forged steel floating ball valve that is threaded, be comprised of valve body 4, valve gap 1, spheroid 3, the valve seat 5 that is located at valve body 4 inside, handle 11; Valve body 4 is provided with valve seal pad 2 with the joint of valve gap 1, valve body 4 is sealing butt-joint structure of microcosmic saw-tooth ring with valve gap 1 connection part, described handle 11 is connected with spheroid 3 by a valve rod 6, and valve rod 6 is provided with valve stem seal pad 7 with valve body 4 sidewall joints and three point arbitrage 8 seals fully; The top of three point arbitrage 8 is provided with sealed pressing sleeve 9.

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 docking saw-tooth ring structure is arranged, 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 the 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.

Be provided with a belleville spring 10 between sealed pressing sleeve 9 and handle 11, valve rod 6 is connected with a nut 12.

The benchmark architecture in described valve seat 5 cross sections is equilateral triangle, the task of valve seat has been that switch spheroid 3 docks with the oblique angle of valve body 4, therefore, valve seat 5 has at least three surfaces at an angle to each other: a sealing surface to the switch spheroid, a sealing surface to 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 do not wait 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 slightly little supporting surface more just in time meets its slip on supporting ring; Moreover, only have the equilateral triangle cross section just can avoid valve seat the weak wedge angle of 60 degree to occur being less than; Therefore, must to meet equilateral triangle be cross section to valve seat.

Claims (3)

1. the single piece type forged steel floating ball valve that is threaded, be comprised of valve body, valve gap, spheroid, the valve seat that is located at valve inner, handle; It is characterized in that: the joint of valve body and valve gap is provided with the valve seal pad, valve body and valve gap connection part are sealing butt-joint structure of microcosmic saw-tooth ring, described handle is connected with spheroid by a valve rod, and valve rod and body wall joint are provided with the valve stem seal pad and three point arbitrage seals fully; The top of three point arbitrage is provided with sealed pressing sleeve.

2. the single piece type forged steel floating ball valve that is threaded according to claim 1, it is characterized in that: be provided with a belleville spring between sealed pressing sleeve and handle, valve rod is connected with a nut.

3. the single piece type forged steel floating ball valve that is threaded according to claim 2, it is characterized in that: the benchmark architecture in valve seat cross section is equilateral triangle.

Images