CN101059175A

CN101059175A - Ball valve

Info

Publication number: CN101059175A
Application number: CN 200710017707
Authority: CN
Inventors: 余龙; 俞树荣
Original assignee: Lanzhou University of Technology
Current assignee: Lanzhou University of Technology
Priority date: 2007-04-13
Filing date: 2007-04-13
Publication date: 2007-10-24
Anticipated expiration: 2027-04-13
Also published as: CN100480562C

Abstract

A ball valve aims at achieving the stable regulation flow in ball valve regulating saturated water process, reducing the generating of phase transition and playing a role of anti-air cavity and reversing anti-negative waterhammer. The left valve body valve seat 9 is installed between the left valve body 7 and the ball body 4, the ball body 4 is opened with a conical through-hole through the valve cavity axial cord, the ball body 4 is installed in the inner cavity of right valve body, the upper end of the ball body 4 is opened with key groove 4'along the central line of ball body 4, the lower end of the valve bar 12 is installed in the key groove 4'and drives the ball body 4 rotating around the central line of ball body 4 as axial cord; the diffuser part of valve cavity of left valve body 7 starts with the left diffuser start point H and finishes with the left diffuser finishing point G, the inner surface of left valve body 7 valve cavity from the valve cavity input mouth I to the left diffuser start point H, the valve cavity of left valve body 7 is a conical surface from the left diffuser start point H to the left diffuser finishing point G, the valve cavity of right valve body 1 is conical surface from the right diffuser start point D to the right diffuser finishing point B, the valve cavity between the right diffuser finishing point B and the valve cavity mouth A of right valve body 1 is circular column surface.

Description

A kind of ball valve

Technical field

The present invention relates to a kind of valve, specifically is the valve of band spherical valve member.

Background technique

In the prior art, when carrying saturation water in the large scale industry pipeline, because the throttling action that the process valve takes place, pressure drops under the saturation pressure when causing saturation water through valve, thereby causes that fractional saturation water undergoes phase transition, and produces water vapour.This situation not only influences the mass flow rate of saturation water in the pipeline, and the cavitation that water vapour causes all has adverse effect to pipeline and valve.Under the operating mode of high request, the general spool of additional tortuous passageway that adopts slows down flow velocity, slows down the amount and the anti-air pocket that produce water vapour, and this makes that not only the pressure loss is bigger, and complex structure, is difficult to maintenance.

Summary of the invention

Purpose of the present invention realizes stable adjusting flow in the ball valve adjusting saturation water process, reduces phase transformation and takes place, and plays the effect of anti-air pocket, reverse anti-negative water hammer.

The present invention is a kind of ball valve, comprise a left valve barrel 7, a right valve barrel 1 has left valve barrel pad 8 between surface of contact, left valve barrel valve seat 9 is placed between left valve barrel 7 and the spheroid 4, in spheroid 4, have a cone-shaped hole along valve pocket axes O O ', spheroid 4 is placed in the inner chamber of right valve barrel 1, the rotation centerline VV ' of the upper end edge spheroid 4 of spheroid 4 have keyway 4 ', the lower end of valve rod 12 be installed in keyway 4 ' in, rotation centerline VV ' with spheroid 4 is an axis, drives spheroid 4 rotations; The diffuser of the valve pocket of left valve barrel 7 originates in left diffusion starting point H, end at left diffusion terminal point G, left valve barrel 7 valve pocket internal surfaces from valve pocket inlet I to left diffusion starting point H are a cylndrical surface, left valve barrel 7 valve pockets from left diffusion starting point H to left diffusion terminal point G are a conical surface, valve pocket from right diffusion starting point D to the right valve barrel 1 of right diffusion terminal point B is a conical surface, and the valve pocket the valve pocket outlet A from right diffusion terminal point B to right valve barrel 1 is a cylndrical surface.

Usefulness of the present invention is: when the axis of spheroid 4 female cone through holes is full-gear when overlapping with valve pocket axes O O ', saturation water enters valve by the inlet I place of left valve barrel, when reaching left valve barrel diffusion starting point H, the beginning pre-loading, finish to left valve barrel diffusion terminal point G pre-loading, this pressure process raises, and anti-cavitation is arranged.Saturation water behind the pre-loading enters the circular cone through hole through the circular cone through hole ingress G of spheroid 4, pass through this circular cone through hole at saturation water, by G point process F point, in the process that arrival E is ordered, because factors such as instability that flows and flow surface processing, assemblings, produce unconspicuous cavitation, a spot of bubble is by the guiding of circular cone through hole, and away from wall, O ' converges to the valve pocket axes O, and the disappearance of around the D point, breaking, make saturation water by playing the effect of anti-air pocket in the circular cone via process.In the process that saturation water is ordered by F point arrival E, pressure has decline to a certain degree, the curved surface supercharging sieve 2 that is positioned at circular cone through hole exit position has slowed down pressure and has fallen, saturation water is begun to boost to the dilatation of right valve barrel diffusion terminal point B place beginning by right valve barrel diffusion starting point D place, the pressure that replenishes the valve body loss of flowing through falls, this pressure process raises, and anti-cavitation is arranged.Saturated flow to right valve barrel 1 outlet A place finishes the stroke in valve body.Owing in time replenishing that pressure falls, has anti-air pocket function in the whole process.

When the axis of spheroid 4 female cone through holes is vertical with valve pocket axes O O ', be complete closed state, valve rod 12 drives spheroid 4 rotations, when the complete opening status transition, G place passage is open-minded at first by complete closed state, and saturated flow is gone into the circular cone through hole in the spheroid 4, then D place passage is open-minded, saturation water flows out the circular cone through hole, and the flow process of saturation water is extended in the opening process, has slowed down negative water hammer effect.

Description of drawings

Fig. 1 is the structural drawing of expression ball valve of the present invention, is the complete opening state, and Fig. 2 is the structural drawing that is in complete closed state.

Embodiment

As shown in Figure 1, left valve barrel 7 valve pocket internal surfaces from the valve pocket of left valve barrel 7 inlet I to left diffusion starting point H are a cylndrical surface, left valve barrel 7 valve pockets from left diffusion starting point H to left diffusion terminal point G are a conical surface, left side diffusion starting point H is the intersection point of how much disks of this conical surface and cylndrical surface intersection and valve pocket axes O O ', and left diffusion terminal point G is the intersection point of how much disks of this conical surface and spheroid 4 intersections and valve pocket axes O O '.The F point is the center line VV ' of spheroid 4 and the intersection point of valve pocket axes O O '.The E point is right valve barrel 1 and the geometry disk of spheroid 4 intersections and the intersection point of valve pocket axes O O '.Valve pocket from right diffusion starting point D to the right valve barrel 1 of right diffusion terminal point B is a conical surface, the D point sieves the geometry disk of 2 inner arc surfaces and cylndrical surface intersection and the intersection point of valve pocket axes O O ' for the curved surface supercharging, the intersection point of how much disks of cylndrical surface intersection and valve pocket axes O O ' in valve pocket conical surface that right diffusion terminal point B is a right valve barrel 1 and the valve pocket.The C point sieves the geometry disk of 2 inner arc surfaces and cylndrical surface intersection and the intersection point of valve pocket axes O O ' for the curved surface supercharging, and the A point is positioned at the outlet port for right valve barrel 1 valve pocket.

Fig. 1 is the structural drawing of the present invention when being in the complete opening state, and the flow of saturation water reaches maximum in this moment valve, and Fig. 2 is the structural drawing of valve when being in complete closed state.As shown in Figure 1, left valve barrel 7 and right valve barrel 1 are connect by isometric stud 5 and nut 6, left valve barrel pad 8 is arranged between surface of contact, be used for spacing and guarantee sealing, left valve barrel valve seat 9 is placed between left valve barrel 7 and the spheroid 4, in spheroid 4, have a cone-shaped hole along valve pocket axes O O ', spheroid 4 is placed in the inner chamber of right valve barrel 1, the rotation centerline VV ' of the upper end edge spheroid 4 of spheroid 4 have keyway 4 ', the lower end of valve rod 12 be installed in keyway 4 ' in, rotation centerline VV ' with spheroid 4 is an axis, drives spheroid 4 rotations, carries out the adjusting of saturation water flow.Curved surface supercharging sieve 2 is installed between right valve barrel 1 and the tapered channel spheroid 4, between curved surface supercharging sieve 2 and right valve barrel 1, right valve barrel filler 14 is housed, be used for spacing and guarantee sealing.Valve rod 12 compresses filler 13 by Gland 11 and seals, and impacting force is provided by the interior six pin screws 10 of top.

As shown in Figure 1, the valve pocket of left valve barrel 7 from the I point to being a cylndrical surface the H point, its internal diameter is D, the valve pocket of left valve barrel 7 is positioned at the inside diameter D at left diffusion terminal point G place _G〉=1.2D, the distance L of left diffusion starting point H and left diffusion terminal point G _HGSpan be: D 〉=L _HG〉=0.5D; The diffuser of right valve barrel 1 valve pocket originates in right diffusion starting point D, ends at right diffusion terminal point B, the inside diameter D of the right valve chamber at right diffusion starting point D place _D≤ 1.2D _E, the distance L of right diffusion starting point D and right diffusion terminal point B _DBSpan be: 1.4D 〉=L _DB〉=0.7D.The entrance G ' of spheroid 4 overlaps with the left diffusion terminal point G of left valve barrel 7 valve pockets, and spheroid 4 is in an E place inside diameter D _ESpan be: 0.6D 〉=D _E〉=0.4D.Sieve diameter is not less than 2mm on the curved surface supercharging sieve 2, and the scope of the circulation area on the curved surface supercharging sieve 2 is 0.5～0.7 times of left valve barrel 7 valve pockets inlet I place circulation area.

Valve rod 12 is by electric control driving device operation rotation, the actual internal area of the E position, outlet port of control spheroid 4, when E place actual internal area is zero, the flow area at G place is not closed fully, and this moment, the flow of saturation water was zero, but the carrying of right valve barrel filler 14 and right valve seat 3 is bigger, when valve rod 12 spheroids 4 rotate to complete closed state, as shown in Figure 2, the carrying of right valve barrel filler 14 and right valve seat 3 is disperseed, and is in a safe condition.

Claims

1, a kind of ball valve, comprise a left valve barrel (7), a right valve barrel (1), left valve barrel pad (8) is arranged between surface of contact, it is characterized in that left valve barrel valve seat (9) is placed between left valve barrel (7) and the spheroid (4), in spheroid (4), have a circular cone through hole along valve pocket axis (OO '), spheroid (4) is placed in the inner chamber of right valve barrel (1), rotation centerline (VV ') at the upper end edge spheroid (4) of spheroid (4) has keyway (4 '), the lower end of valve rod (12) is installed in the keyway (4 '), rotation centerline (VV ') with spheroid (4) is an axis, drives spheroid (4) rotation; The diffuser of the valve pocket of left valve barrel (7) originates in left diffusion starting point (H), end at left diffusion terminal point (G), left valve barrel (7) valve pocket internal surface from valve pocket inlet (I) to left diffusion starting point (H) is a cylndrical surface, left valve barrel (7) valve pocket from left diffusion starting point (H) to left diffusion terminal point (G) is a conical surface, the valve pocket of the right valve barrel (1) from right diffusion starting point (D) to right diffusion terminal point (B) is a conical surface, and the valve pocket the valve pocket outlet (A) from right diffusion terminal point (B) to right valve barrel (1) is a cylndrical surface.

2, ball valve according to claim 1 is characterized in that being equipped with between right valve barrel (1) and the spheroid (4) curved surface supercharging sieve (2), between curved surface supercharging sieve (2) and right valve barrel (1) right valve barrel filler (14) is installed.

3, ball valve according to claim 1 is characterized in that the valve pocket of left valve barrel (7) is positioned at the inside diameter D that left diffusion terminal point (G) is located _G〉=1.2D, the distance L of left diffusion starting point (H) and left diffusion terminal point (G) _HGSpan be: D 〉=L _HG〉=0.5D; The diffuser of right valve barrel (1) valve pocket originates in right diffusion starting point (D), ends at right diffusion terminal point (B), and right diffusion starting point (D) is the intersection point that the arc surface of (2) is sieved in valve pocket axis (OO ') and curved surface supercharging, the inside diameter D of the right valve chamber that right diffusion starting point (D) is located _D≤ 1.2D _E, the distance L of right diffusion starting point (D) and right diffusion terminal point (B) _DBSpan be: 1.4D 〉=L _DB〉=0.7D.

4, ball valve according to claim 1 is characterized in that the entrance (G ') of spheroid (4) overlaps with the left diffusion terminal point (G) of left valve barrel (7) valve pocket, and spheroid (4) is located inside diameter D at point (E) _ESpan be: 0.6D 〉=D _E〉=0.4D.

5, according to claim 1 and 2 described ball valves, it is characterized in that the last sieve diameter of curved surface supercharging sieve (2) is not less than 2mm, the scope of the circulation area on the curved surface supercharging sieve (2) is 0.5～0.7 times that left valve barrel (7) valve pocket inlet (I) is located circulation area.