A kind of ball valve sealing structure
Technical field
The utility model relates to fluid technique, relates more specifically to a kind of ball valve sealing structure.
Background technique
In prior art, the serviceability of the ball valve body under complex working condition and the sealing configuration between valve seat is always not high, and particularly under high pressure height sulfur-bearing operating mode, as used rubber material to seal, medium can cause strong erosion to rubber packing material, makes seal failure.
The piston ring design of the ball seat under some high pressure height sulfur-bearing operating mode is general adopts multiple spring energy-storage circle and the structure of fixing frame of arranging in pairs or groups, this design adopts the characteristic of the pressure-bearing spreading of spring energy-storage circle to seal, but spring energy-storage circle spreading amplitude is little, this provides for improved the requirement on machining accuracy of each metal parts be mated; The sealing surface of spring energy-storage circle needs very little intermetallic composite coating surface roughness precision (the required roughness in surface be 0.8 within), otherwise its sealing surface is very easily ground in the process used, and strict roughness restriction makes metal parts manufacturing procedure loaded down with trivial details, except conventional turnery processing operation, grinding machine need be used to reduce roughness, and machining accuracy is wayward; Spring energy-storage circle contained spring is vulnerable to filling and the destruction of impurity in medium, contained spring was lost efficacy or is destroyed; Spring energy-storage circle is one-way sealing, when one of them spring energy-storage circle lost efficacy medium by, then another spring energy-storage circle back is born medium power and is caused closing, and does not reach sealing effect, will cause the global failure of seal ring group, and loss is greatly.
Model utility content
In view of this, the purpose of this utility model is that providing a kind of adopts symmetrically arranged combined type packing ring group, can make the ball valve sealing structure that the requirement on machining accuracy of gland, valve seat and the valve body closed with described seal ring assembly reduces.
Another object of the present utility model be to provide a kind of can according to the pressure changing in ball valve, in good time regulates sealing configuration, makes sealing configuration remain at the ball valve sealing structure of effective sealing state.
The ball valve sealing structure that the utility model provides, it is characterized in that, comprise valve body, valve seat, seal ring group, gland and elastic component, one end of described valve seat snaps in described valve body, described valve seat can slide axially by relatively described valve body, the cavity extended vertically is provided with between described valve seat and valve body, described seal ring group is set in described cavity, one end of described seal ring group is resisted against on the shoulder of described valve seat, the other end of described seal ring group is positioned in what described gland can slide axially be arranged on described cavity, described gland is used for being compressed by the shoulder of described seal ring group to described valve seat under the effect of elastic component.
Preferably, be also provided with elastic component fitting seat, in the glide direction of valve seat, described elastic component fitting seat to be arranged between described valve body and valve seat and to be resisted against on described valve body; Described elastic component fitting seat is roughly tubular structure, and inside is provided with axially through first flow, and is provided with at least two elastic component mounting holes; Described elastic component one end snaps in described elastic component mounting hole, and the other end is resisted against on an end face of described gland.
Preferably, described elastic component is cylindrically coiled spring.
Preferably, described valve seat comprises radial limited part, seal ring group assembly department and sealing fit portion, and described radial limited part is fastened on one end relative with described elastic component fitting seat in described valve body, and described valve seat can axially be slided by valve body relatively; Described cavity is formed between described seal ring group assembly department and the inwall of valve body; The described sealing fit portion matched with spheroid is arranged on the large end face of described valve seat.
Preferably, described valve seat is axially provided with the second runner, described second runner is communicated with described first flow.
Preferably, described seal ring group is arranged on described seal ring group assembly department, described seal ring group comprises at least one sub-sealing-ring group, each sub-sealing-ring group includes the first seal ring cooperatively interacted, second seal ring and the 3rd seal ring, described first seal ring has man type opening, described second seal ring cross section is man type, described 3rd seal ring cross section is roughly triangle, described first seal ring is arranged at one end of described seal ring group, described 3rd seal ring is arranged at the other end of described seal ring group, described second seal ring is between described first seal ring and the 3rd seal ring, the man type opening of described first seal ring is towards the second seal ring, the man type opening of described second seal ring is towards the 3rd seal ring, the wedge angle of described 3rd seal ring is towards the second seal ring.
Preferably, described first seal ring and the 3rd seal ring are respectively arranged with plane card-tight part on the bi-side of seal ring group axis, described first seal ring is clamped on the shoulder on described valve seat by described plane card-tight part, described 3rd seal ring is clamped on the end face of described gland by described plane card-tight part, described second seal ring and be provided with preset clearance between the first seal ring and the 3rd seal ring on the axial direction of seal ring.
Preferably, described seal ring group comprises the first sub-sealing-ring group and the second sub-sealing-ring group, described first sub-sealing-ring group is arranged in the mode that man type opening is relative with the second sub-sealing-ring group, and the plane card-tight part of two the first seal rings of two sub-sealing-ring groups is resisted against on described valve seat and gland respectively.
The ball valve sealing structure that the utility model provides, owing to adopting symmetrically arranged combined type packing ring group, the requirement on machining accuracy of gland, valve seat and the valve body closed with described seal ring assembly is reduced, and the seal ring group elastic deformability of this structure is stronger, can compensate the seal failure that the concentrated wear of single seal ring produces.Further, the sealing configuration of described elastic component, valve seat and gland composition, can according to the pressure changing in ball valve, and in good time regulates sealing configuration, makes sealing configuration remain at effective sealing state.
Accompanying drawing explanation
By referring to the description of accompanying drawing to the utility model embodiment, above-mentioned and other objects of the present utility model, feature and advantage will be more clear, in the accompanying drawings:
Fig. 1 is the schematic diagram of ball valve sealing structure in the present embodiment;
Embodiment
Hereinafter with reference to accompanying drawing, various embodiment of the present utility model is described in more detail.In various figures, identical element adopts same or similar reference character to represent.For the sake of clarity, the various piece in accompanying drawing is not drawn in proportion.
Illustrate, in the application, the axis of valve body refers to the axial direction of the runner that valve body is arranged, and the axis of valve seat refers to the axial direction of the runner that valve seat is arranged.
As shown in Figure 1, ball valve sealing structure in the present embodiment comprises valve body 1, valve seat 2, seal ring group 3, gland 4 and elastic component 5, one end of described valve seat 2 snaps in described valve body 1, described valve seat 2 can slide axially by relatively described valve body 1, the cavity extended vertically is provided with between described valve seat 2 and valve body 1, described seal ring group 3 is set in described cavity, one end of described seal ring group 3 is resisted against on the shoulder of described valve seat 2, the other end of described seal ring group 3 is positioned in what described gland 4 can slide axially be arranged on described cavity, described gland 4 for compressing the shoulder of described seal ring group 3 to described valve seat 2 under the effect of elastic component 5.
Preferably, be also provided with elastic component fitting seat 6, in the glide direction of valve seat 2, described elastic component fitting seat 6 to be arranged between described valve body 1 and valve seat 2 and to be resisted against on described valve body 1.Described elastic component fitting seat 6 is roughly tubular structure, inside is provided with axially through first flow 10, and be evenly provided with at least two elastic component mounting holes 61 along outer rim, described elastic component 5 one end snaps in described elastic component mounting hole 61, the other end is resisted against on an end face of described gland 4, provides certain pretightening force to described gland 4.Described elastic component 5 is preferably cylindrically coiled spring.
Described valve seat 2 comprises radial limited part 21, seal ring group assembly department 22 and sealing fit portion 23, and described radial limited part 21 is fastened on one end relative with described elastic component fitting seat 6 in described valve body 1, and described valve seat 2 can axially be slided by valve body 1 relatively; Described cavity is formed between described seal ring group assembly department 22 and the inwall of described gland 4 and valve body 1; The described sealing fit portion 23 matched with spheroid 7 is arranged on the large end face of described valve seat 2, for carrying out fitted seal with the sphere of spheroid 7.Described valve seat 2 is axially provided with the second runner 20, and described second runner 20 is communicated with described first flow 10, passing through for fluid.
Described seal ring group 3 is formed by the material with certain anti-corrosion capacity and elastic deformability, such as teflon.Described seal ring group 3 is arranged on described seal ring group assembly department 22, described seal ring group 3 comprises at least one sub-sealing-ring group, each sub-sealing-ring group includes the first seal ring 301 cooperatively interacted, second seal ring 302 and the 3rd seal ring 303, described first seal ring 301 has man type opening, described second seal ring 302 cross section is man type, described 3rd seal ring 303 cross section is roughly triangle, described first seal ring 301 is arranged at one end of described seal ring group 3, described 3rd seal ring 303 is arranged at the other end of described seal ring group 3, described second seal ring 302 is between described first seal ring 301 and the 3rd seal ring 303, the man type opening of described first seal ring 301 is towards the second seal ring 302, the man type opening of described second seal ring 302 is towards the 3rd seal ring 303, the wedge angle of described 3rd seal ring 303 is towards the second seal ring 302, described first seal ring 301 and the 3rd seal ring 303 are respectively arranged with plane card-tight part 3011 on the bi-side of seal ring group 3 axis, 3031, described first seal ring 301 is clamped on the shoulder on described valve seat 2 by described plane card-tight part 3011, described 3rd seal ring 303 is clamped on by described plane card-tight part 3031 on the end face of described gland 4, described second seal ring 302 and be provided with preset clearance between the first seal ring 301 and the 3rd seal ring 303 on the axial direction of seal ring, described preset clearance provides resiliently deformable space for described seal ring group 3.Preferably, described seal ring group 3 comprises the first sub-sealing-ring group 31 and the second sub-sealing-ring group 32, described first sub-sealing-ring group 31 is arranged in the mode that man type opening is relative with the second sub-sealing-ring group 32, the plane card-tight part 3011 of two the first seal rings 301 of two sub-sealing-ring groups is resisted against on described valve seat 2 and gland 4 respectively, under the effect of described elastic component 5, there is provided certain pretightening force by described gland 4 to described seal ring group 3, make mutually to extrude the seal action coordinating and realize ball valve sealing structure in the application between each seal ring described.
When being low pressure operating mode or when not having pressure in valve pocket, described gland 4 clamps described seal ring group 3 under the effect of elastic component 5, make described seal ring group 3 produce the inwall close contact of resiliently deformable and described valve seat 2 and valve body 1, realize the seal action between valve seat 2 and valve body 1; In addition, the elastic strain that elastic component 5 produces, promotes described valve seat 2 and moves towards the direction of described spheroid 7, described valve seat 2 is clamped mutually with the outer surface of described spheroid 7, realizes the seal action between valve body 1 and spheroid 7.In change in fluid pressure process in valve pocket, described elastic component 5 can adjust elastic deformation amount thereupon, makes described seal ring group 3 remain at effective sealing state, and makes to keep tight-seal condition between described valve seat 2 and described spheroid 7.
In the application, owing to adopting symmetrically arranged combined type packing ring group, the requirement on machining accuracy of gland 4, valve seat 2 and the valve body 1 coordinated with described seal ring group 3 is reduced, and the seal ring group elastic deformability of this structure is stronger, can compensate the seal failure that the concentrated wear of single seal ring produces.Further, the sealing configuration of described elastic component 5, valve seat 2 and gland 4 composition, can according to the pressure changing in ball valve, and in good time regulates sealing configuration, makes sealing configuration remain at effective sealing state.
Should be noted that, in this article, the such as relational terms of first and second grades and so on is only used for an entity or operation to separate with another entity or control panel, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
Last it is noted that obviously, above-described embodiment is only for the utility model example is clearly described, and the restriction not to mode of execution.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all mode of executions.And thus the apparent change of amplifying out or variation be still among protection domain of the present utility model.