CN203809745U - Ball valve metal valve seat with elastic compensation function and pressure-assisted sealing function - Google Patents

Abstract

The utility model discloses a ball valve metal valve seat with an elastic compensation function and a pressure-assisted sealing function. The ball valve metal valve seat is mainly technically characterized in that an outlet valve seat assembly comprises a valve seat body and a supporting body, the valve seat body and the supporting body are combined through threads and weld joints, an elastic arm is arranged on the valve seat body, the elastic arm is bent towards the supporting body, the thickness of the elastic arm is appropriately reduced, the elastic arm has certain elastic deformation capacity, the tongue portion at the front end of the elastic arm and the supporting body are attached to each other through a conical face or a plane after a valve is assembled and tightly pressed, a small gap exists between the attached faces in the unassembled free state, and an annular pressure cavity is formed between the elastic arm and the supporting body. The ball valve metal valve seat has the advantages that the sealing face portion of the valve seat has high elastic compensation capacity, enough compensation can be provided when accuracy errors, uneven abrasion and high temperature deformation happen to a ball body, and medium pressure can assist in sealing; the valve has durable and reliable sealing performance, and meanwhile machining difficulty and manufacturing cost of the ball body are lowered.

Description

The ball valve metal seat valve with elastic compensating and pressure assisted seal function

Technical field

The utility model relates to a kind of valve mechanism, is specifically related to a kind of metal seat valve structure of hard seal ball valve.

Background technique

Hard seal ball valve because have that keying speed is fast, sealing surface has self cleaning capacity while closing, sealing surface flow resistance and advantage such as crushing is little after opening state can not be subject to the washing away of flowing medium, valve opening, thereby the application in the industries such as thermal power plant and system is more and more extensive, as in large electric power plant unit, in small-bore hard seal ball valve hydrophobic in main steam, reheated steam, to empty steam discharge, feedwater, cooling water cut off, stove water row Mian, there is application comparatively widely the aspects such as steam superpressure safety relief.Some product in this class hard seal ball valve, its applying working condition requirement is: the main normally off in High Pressure Difference; Open and close number of times more even more frequent.Due to the normal closed condition in High Pressure Difference, therefore valve is had to very high seal request, once have, leak forming more serious erosion damage to sealing surface very soon, after leaking under some applying working condition, also can produce cavitation damage; Open and close and frequently the anti-scuffing function that resistance to wears of the operational safety of valve and sealing surface has been proposed to higher requirement.

The existing products export side valve of hard seal ball valve seat generally all adopts all-in-one-piece full rigid construction (seeing Fig. 1), in order to make valve can reach seal request after closing, spheroid comprises that in machining accuracy the aspects such as circularity, dimensional accuracy need to reach very high requirement, and need before assembling, to spheroid and sealing surface of seat, carry out facing-up.This class hard seal ball valve product that at present power plant is used, can meet usage requirement substantially, is mainly the product of external several brands.From product manufacture and use, there are following several deficiencys in this class hard seal ball valve product: 1, because all-in-one-piece full rigid metal valve seat itself does not have compensation ability, therefore the processing of sphere need to reach very high precision, and this can increase manufacture difficulty and cost of production undoubtedly; 2, the spheroid of ball valve and sealing surface of seat are in opening-closing process, and different heights andfrictional conditions is in the vertical direction different, i.e. the wearing and tearing of spheroid and sealing surface are uneven wears; In addition, although spheroid has carried out facing-up with sealing surface of seat when closing and before the position assembling that matches of sealing surface of seat, but all the other positions of spherome surface still also exist certain error, so spheroid and sealing surface of seat are also uneven wears in the wearing and tearing that open and close overall process.Uneven wear will cause valve sealability decline in use for some time even to occur more serious leakage; 3, in small-bore hard seal ball valve, due to the rigidity of valve seat large therefore its to the substantially uncompensated ability of the error of the anastomose property of sealing pair, when valve is used in worst hot case, even if the distortion that valve seat produces is more small, also likely can cause valve to occur leaking.And the valve seat of this class valve and spheroid live through thermal spray process in the later stage of processing---sealing surface supersonic spray coating Tungsten carbite, there is certain internal stress, the probability that therefore produces certain distortion when entering the condition of high temperature is larger.

Be illustrated in figure 2 the schematic diagram that carries out improved a kind of prior art for above-mentioned deficiency, its improvement of carrying out is: the endoporus at outlet valve seat (6) has an annular groove near sealing surface place, to allow valve seat have certain elastic compensating ability near the position of sealing surface.From practical application effect, this structure also fails to produce compensation ability and the effect that can meet use needs, its reason is: in order to guarantee intensity and the operational safety of valve seat, the thickness that elastic groove left side needs to keep enough, the degree of depth of groove can not be excessively dark, so valve seat elastic groove left side is difficult to obtain enough resiliently deformables and compensation ability near the position of sealing surface; In addition, sealing surface of seat is near the position of left side owing to cannot producing distortion and displacement completely with respect to its bending moment arm at the bottom of elastic groove is very short, and this also makes sealing surface inner side allow to produce bending deflection also cannot to play a role.

Summary of the invention

In order to overcome the existing above-mentioned deficiency of prior art and structure, the utility model proposes a kind of sealability that there is enough resiliently deformables and compensation ability, can effectively improve valve, keep the metallic elastic valve seat construction of the hard seal ball valve of more lasting sealing life.

To achieve these goals, the utility model is by the following technical solutions:

A kind of ball valve metal seat valve structure with elastic compensating and pressure assisted seal function, the innovation of carrying out and improvement are mainly for outlet valve seat, its main technical schemes is: outlet side adopts outlet valve holder assembly, described outlet valve holder assembly comprises valve body and support, the part of the revolution build that centered by valve body and support, line overlaps, position relationship is inside and outside configuration, there is the weld seam welding in both junctions one end that both are incorporated in away from spheroid direction with outside thread and internal thread knot, a side at the close spheroid of valve body, be provided with and bend towards support direction, thickness appropriateness attenuate and there is certain elastic deformability's elastic arm, at elastic arm is the tongue of valve body foremost, the surface that its front side of described tongue fits with spheroid after assembling is the sealing surface of outlet valve holder assembly, at valve, assemble, after compression, between the rear side of the tongue of valve body and support, with the conical surface or plane, fit, and the free state of outlet valve holder assembly when not assembling with spheroid and other part, between described tongue rear side and the conical surface of support or plane faying surface, there is less gap, between crooked elastic arm on valve body and tongue trailing flank and support, be provided with an annular cavity---pressure chamber.

As the refinement to technique scheme, the utility model additional two following concrete technological schemes:

Valve body is positioned at the inner side of support, after valve assembling, compressing, between the rear side of the tongue of valve body and support, with the conical surface, fits; On support, be uniform-distribution with several squeeze into from cylindrical, through holes of leading to pressure chamber.

Valve body is positioned at the outside of support, after valve assembling, compressing, between the rear side of the tongue of valve body and support, with plane, fits;

In order further to improve product usability, the utility model is additional two following concrete technological schemes also:

Outside at the sealing surface of valve body tongue, be provided with the plane of a narrower ring, at anti-blocking sheath of support arranged outside, the mode that described anti-blocking sheath screws with screw thread is fixed on support, the front end of anti-blocking sheath is thinner thickness, aduncate sheath elastic arm, and sheath elastic arm is adjacent to the ring plane in aforesaid valve body tongue sealing surface outside mutually by the plane of the inner side of inner radius.

At the dorsal part of import valve seat, be provided with the seal ring of single wedge shape, the cylindrical of seal ring coordinates with valve body inner bore, seal ring is fitted with conical surface between one end of spheroid direction and import valve seat, the other end of seal ring is provided with pressure ring, one side end face of pressure ring is pressed on seal ring end face, and pressure ring the other end plane arranged outside has belleville spring.

By the application of technique scheme, the beneficial effect that the utility model produces is: outlet valve seat sealing surface portion position has enough resiliently deformables and compensation ability, in spheroid accuracy of manufacturing, there is certain error, open and close certain number of times rear valve base and spherome surface and have uneven wear, worst hot case lower valve base and spheroid can provide the compensation of satisfying the demand while there is certain distortion, and can help pressure medium auxiliary seal by nationality, simultaneously by improving the sealability of suction side valve seat location, thereby guarantee that valve has lastingly, reliable sealability, also the processing of sphere difficulty and manufacture cost have been reduced simultaneously.

Accompanying drawing explanation

Fig. 1 is prior art---outlet valve seat adopts the hard seal ball valve schematic diagram of all-in-one-piece full rigid construction.

Fig. 2 is prior art---outlet valve seat endoporus increases the hard seal ball valve schematic diagram of elastic groove.

Fig. 3 is that schematic diagram--valve body of one of the utility model embodiment is positioned at the inner side of support.

Fig. 4 is one of embodiment's the outlet valve holder assembly partial enlarged drawing before valve assembling.

Fig. 5 is that schematic diagram--valve body of two of the utility model embodiment is positioned at the outside of support.

Fig. 6 be the utility model embodiment three schematic diagram--on outlet valve holder assembly, increase anti-blocking sheath.

In figure, 1, valve body; 2, import valve seat; 3, belleville spring; 4, spheroid; 5, valve rod; 6, outlet valve seat; 7, outlet valve holder assembly, 7-1, valve body, 7-1-1, tongue, 7-1-2, elastic arm, 7-1-3, pressure chamber, 7-2, support; 8, anti-blocking sheath; 9, pressure ring; 10, seal ring.

Embodiment

Below in conjunction with accompanying drawing and three embodiments, the technical solution of the utility model is further elaborated.

Embodiment one

As shown in Figure 3, be the schematic diagram of the present embodiment.Valve rod (5) is connected with spheroid (4) by flat gesture, and the left side of spheroid (4) is import valve seat (2), and right side is outlet valve holder assembly (7), outlet valve holder assembly (7) is comprised of valve body (7-1) and support (7-2) two-part, valve body (7-1) and support (7-2) are coaxial inside and outside configuration relation, at interior, support (7-2) outside, both revolve and are incorporated in right-hand member and carry out seal weld and both connections are combined into one with screw thread valve body (7-1), left side at valve body (7-1), be provided with bent outward to support (7-2) direction, thickness appropriateness attenuate and there is certain elastic deformability's elastic arm (7-1-2), at elastic arm (7-1-2) is the tongue (7-1-1) of valve body (7-1) foremost, the surface that its front side of described tongue (7-1-1) fits with spheroid (4) after assembling is the sealing surface of outlet valve holder assembly (7), spherical zone surface for matching with spheroid (4) surface after the processing of sealing face, before valve assembling, can and carry out suitable facing-up for spheroid (4) or the adopting process spheroid assembling by it, to improve its precision and roughness, after valve assembling and compressing, the rear side surface of the tongue (7-1-1) of valve body (7-1), and the conical surface that the semi-cone angle of take between support (7-2) is 45 ° fits, and the free state of outlet valve holder assembly (7) when not assembling with spheroid (4) and other part, described tongue (7-1-1) and both semi-cone angle of support (7-2) are between the conical surface faying surface of 45 °, have the gap (referring to Fig. 4) of t=0.06～0.08mm, between crooked elastic arm (7-1-2) on valve body (7-1) and tongue (7-1-1) trailing flank and support (7-2), be also provided with an annular cavity---pressure chamber (7-1-3), from the cylindrical of support (7-2), inwardly evenly beat several through holes that lead to pressure chamber (7-1-3) simultaneously.

Arranging in the prior art of elastic groove on outlet valve seat endoporus shown in Fig. 2, in order to prevent that elastic groove left side from producing excessive plastic bending modification when larger valve seat was lost efficacy stressed to sealing surface region, groove left side is also relatively shallow to the degree of depth of the thickness that needs between sealing surface to keep enough and groove, thereby sealing surface of seat position is difficult to obtain enough resiliently deformables and compensation ability, this elastic compensating structure cannot be played a role.And in the utility model, because the gap (0.06～0.08mm) arranging between the tongue (7-1-1) of valve body (7-1) and support (7-2) has defined the maximum distortion displacement amount of tongue (7-1-1) when the pressurized, excessive deformation and the destruction of predetermined deformation amount can not be there is to surpass, therefore the suitable thickness of elastic arm (7-1-2) can be determined according to the requirement of give security the most effectively needed resiliently deformable of lasting sealing and compensation ability.

Valve seat has stronger elastic compensating ability, except can strengthen widely valve sealability, reduce spheroid accuracy of manufacturing requires, for opening and closing number of times compared with frequently having caused the more wearing and tearing of sealing pair and the valve of uneven wear, the stronger elastic compensating ability of valve seat also contributes to valve to maintain more lasting sealing life.

Why between valve body (7-1) and support (7-2), except being threaded, also to weld at right-hand member, because for outlet valve holder assembly (7), gap between valve body (7-1) and support (7-2) is a leakage way, therefore need to carry out seal weld.

The effect that annular pressure chamber (7-1-3) is set between tongue (7-1-1), elastic arm (7-1-2) and the support (7-2) of valve body (7-1) is: medium enters pressure chamber (7-1-3) by the gap of the taper faying surface of the through hole on support (7-2) and valve body (7-1), support (7-2), and pressure medium acts on the thrust that elastic arm (7-1-2) and tongue (7-1-1) surface produce can reach better sealing state by auxiliary valve seat sealing surface.

In addition, in order to improve the sealability of valve, the seal ring (10) of the Expanded graphite compacting of single wedge shape is set at the dorsal part of import valve seat (2), the cylindrical of seal ring (10) coordinates with valve body (1) endoporus, seal ring (10) is fitted with conical surface between one end of spheroid (4) direction and import valve seat (2), the other end of seal ring (10) is provided with pressure ring (9), one side end face of pressure ring (9) is pressed on seal ring (10) end face, and pressure ring (9) the other end plane arranged outside has belleville spring (3).

In Fig. 1, Fig. 2, the sealing configuration using import valve seat place as suction side does not design, and suction side and lumen do not cut off completely, and the sealing of valve guarantees by outlet side valve seat completely; And in the utility model, dorsal part at import valve seat (2) arranges seal ring (10), sealing surface and seal ring (10) by import valve seat (2) cut off valve inlet passage and lumen, make only may produce from import to lumen by sealing surface micro-leakage and even at the sealing surface of import valve seat (2) and the anastomose property of spheroid (4), reach complete in leak condition when better, thereby make import valve seat and export the dual fail-safe that valve seat can form valve seal, greatly improving sealability and the sealing reliability of valve.

Embodiment two

As shown in Figure 5, it is the schematic diagram of the present embodiment, outlet valve holder assembly (7) is comprised of valve body (7-1) and support (7-2), valve body (7-1) outside and support (7-2) interior, both are combined into one to be threaded, and carry out spot welding or whole lap welding at the screw thread place of right-hand member.After valve assembling and compression, between the rear side surface of the tongue (7-1-1) of valve body (7-1) and support (7-2), with plane, fit; During the free state of outlet valve holder assembly (7) when not assembling with spheroid (4) and other part, between tongue (7-1-1) and both laminating planes of support (7-2), there is less gap; The elastic arm (7-1-2) that is bending shape, thickness appropriateness attenuate has certain elastic deformability.

After valve assembling, under the promotion of belleville spring (3) impacting force, import valve seat (2) is adjacent to spheroid (4) and promotes the sealing surface that spheroid (4) is affixed to outlet valve holder assembly (7), tongue (7-1-1) and elastic arm (7-1-2) produce micro-elastic bending deflection under thrust fits like a glove sealing surface and spherome surface, guarantees the sealing of valve.

Embodiment three

For some pipe-line system and operating mode medium, in mobile medium, may there is the solid matters such as burning product of some impurity, pipeline and equipment inner chamber, in valve opening and closing process, once some the little particles in these solid matters enter in gap default between the tongue (7-1-1) of valve body (7-1) of outlet valve holder assembly (7) and support (7-2), can make the resiliently deformable of corresponding site be subject to certain restrictions, thereby after closing, provide reliably required compensation to bring impact may to the sealing surface of outlet valve component (7).Therefore,, at the upper Anti-blocking structure that increases of outlet valve holder assembly (7), the sealing reliability of the valve seat construction that the utility model proposes will be contributed to further to improve.

As shown in Figure 6, in the present embodiment, the valve body (7-1) of outlet valve holder assembly (7) and the structure of support (7-2) are as described in embodiment one, at interior and support (7-2) outside, the faying surface between the tongue (7-1-1) of valve body (7-1) and support (7-2) after assembling compresses is the conical surface to valve body (7-1).Outside at the sealing surface of valve body (7-1) tongue (7-1-1), be provided with the plane of a narrower ring, in support (7-2) outside, be provided with an anti-blocking sheath (8), the mode that described anti-blocking sheath (8) screws with screw thread is fixed on support (7-2), the front end of anti-blocking sheath (8) is thinner thickness, aduncate sheath elastic arm (8-1), and sheath elastic arm (8-1) is adjacent to the ring plane in aforesaid valve body (7-1) tongue (7-1-1) sealing surface outside mutually by the plane of the inner side of inner radius.

In addition, on the cylindrical of anti-blocking sheath (8) and endoporus, be also provided with several annular grooves, on cylindrical, be provided with two cylindrical pits; When anti-blocking sheath (8) is assembled on outlet valve holder assembly (7), with special tool and by the cylindrical pit on workpiece, screw anti-blocking sheath (8), when the sheath elastic arm (8-1) of anti-blocking sheath (8) front end leans on the inner side plane of inner radius and the ring plane in valve body (7-1) sealing surface outside to contact, continue rotating block-proof sheath (8) several angle, make sheath elastic arm (8-1) produce certain resiliently deformable and aforesaid surface of contact appropriateness is adjacent to; Loosening in order to prevent anti-blocking sheath (8), locking at anti-blocking sheath (8) right-hand member and the spot welding of support (7-2) adjacent, or in this adjacent position, make a call to a counterbore and packing that valve body (1) is front places the straight pin that a length is not more than hole depth in counterbore into, thereby nationality helps valve body hole wall to stop straight pin to drop out to reach, prevent the loosening object of anti-blocking sheath (8).

The cylindrical of anti-blocking sheath (8) adopts very little the coordinating in gap with valve body (1) at the endoporus of corresponding position, medium can enter into pressure chamber (7-1-3) the auxiliary valve sealing between valve body (7-1) and support (7-2), impurity particle is difficult to enter, even if be also more easily trapped in while having impurity particle to enter in several annular grooves that arrange on the cylindrical of anti-blocking sheath (8) and endoporus midway; Meanwhile, the front side of valve body (7-1) is also sealed by the end of the sheath elastic arm (8-1) of anti-blocking sheath (8).Therefore, on outlet valve holder assembly (7), be provided with after anti-blocking sheath (8), when valve opening and closing, can effectively stop impurity particle to enter in gap default between the tongue (7-1-1) of valve body (7-1) and support (7-2), thereby make to export valve component (7), can keep preferably guaranteeing that valve is reliable uses required elastic compensating ability.

The wall thickness of locating due to the sheath elastic arm (8-1) of anti-blocking sheath (8) will be significantly smaller than the wall thickness that the elastic arm (7-1-2) of valve body (7-1) is located, so it is adjacent to the ring in valve body (7-1) tongue (7-1-1) outside and is very little on the elastic deformability's of tongue (7-1-1) impact.

Below in conjunction with the accompanying drawings and embodiments embodiment of the present utility model is described, but these explanations can not be understood to limit scope of the present utility model.Those skilled in the art should know; the utility model is not restricted to the described embodiments; its protection domain is defined by appending claims; any formed technological scheme of various changes, modification within not exceeding the scope that the utility model claims define; all do not depart from spirit of the present utility model and technical spirit, within still can belonging to claim scope of the present utility model.

Claims (5)

1. a ball valve metal seat valve with elastic compensating and pressure assisted seal function, it comprises spheroid (4), outlet valve holder assembly (7), sealing surface on the sphere of spheroid (4) and outlet valve holder assembly (7) is the hardening surface through surface Hardening Treatment, it is characterized in that: described outlet valve holder assembly (7) comprises valve body (7-1) and support (7-2), centered by valve body (7-1) and support (7-2), line overlaps, in position relationship is, the part of the revolution build of outer configuration, there is the weld seam welding in both junctions one end that both are incorporated in away from spheroid (4) direction with outside thread and internal thread knot, a side at the close spheroid of valve body (7-1), be provided with and bend towards support (7-2) direction, thickness appropriateness attenuate and there is certain elastic deformability's elastic arm (7-1-2), at elastic arm (7-1-2) is the tongue (7-1-1) of valve body (7-1) foremost, the surface that its front side of described tongue (7-1-1) fits with spheroid (4) after assembling is the sealing surface of outlet valve holder assembly (7), at valve, assemble, after compression, between the rear side of the tongue (7-1-1) of valve body (7-1) and support (7-2), with the conical surface or plane, fit, and the free state of outlet valve holder assembly (7) when not assembling with spheroid (4) and other part, between described tongue (7-1-1) rear side and both conical surfaces of support (7-2) or plane faying surface, there is less gap, between crooked elastic arm (7-1-2) on valve body (7-1) and tongue (7-1-1) trailing flank and support (7-2), be provided with an annular cavity---pressure chamber (7-1-3).

2. the ball valve metal seat valve with elastic compensating and pressure assisted seal function according to claim 1, it is characterized in that: valve body (7-1) is positioned at the inner side of support (7-2), after valve assembling, compressing, between the rear side of the tongue (7-1-1) of valve body (7-1) and support (7-2), with the conical surface, fit; Upper at support (7-2), be uniform-distribution with several squeeze into from cylindrical, through holes of leading to pressure chamber (7-1-3).

3. the ball valve metal seat valve with elastic compensating and pressure assisted seal function according to claim 1, it is characterized in that: valve body (7-1) is positioned at the outside of support (7-2), after valve assembling, compressing, between the rear side of the tongue (7-1-1) of valve body (7-1) and support (7-2), with plane, fit.

4. the ball valve metal seat valve with elastic compensating and pressure assisted seal function according to claim 2, it is characterized in that: in the outside of the sealing surface of valve body (7-1) tongue (7-1-1), the plane that has a narrower ring, in support (7-2) arranged outside, there is an anti-blocking sheath (8), the mode that described anti-blocking sheath (8) screws with screw thread is fixed on support (7-2), the front end of anti-blocking sheath (8) is thinner thickness, aduncate sheath elastic arm (8-1), sheath elastic arm (8-1) is adjacent to the ring plane in aforesaid valve body (7-1) tongue (7-1-1) sealing surface outside mutually by the plane of the inner side of inner radius.

5. the ball valve metal seat valve with elastic compensating and pressure assisted seal function according to claim 1, it is characterized in that: the seal ring (10) that is provided with single wedge shape at the dorsal part of import valve seat (2), the cylindrical of seal ring (10) coordinates with valve body (1) endoporus, seal ring (10) is fitted with conical surface between one end of spheroid (4) direction and import valve seat (2), the other end of seal ring (10) is provided with pressure ring (9), one side end face of pressure ring (9) is pressed on seal ring (10) end face, and pressure ring (9) the other end plane arranged outside has belleville spring (3).