CN201074683Y

CN201074683Y - Ball valve structure

Info

Publication number: CN201074683Y
Application number: CNU200720031583XU
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: 2008-06-18
Anticipated expiration: 2017-04-13

Abstract

The utility model discloses a ball valve structure with the purpose to realize stable flow rate regulation during the process of saturating water by the ball valve, and realizes the functions of cavitation resistance and reverse negative water-hammer resistance. A valve base 9 of a left valve is arranged between a left valve body 7 and a ball body 4, the ball body 4 is opened with a conical through-hole along the axial line of a valve cavity, the ball body 4 is arranged in the inner cavity of a right valve body 1, a key slot 4' is opened at the top end of the ball body 4 along the central line of the ball body 4, the lower end of a valve rod 12 is arranged in the key slot 4' and drives the ball body 4 by taking the central line of the ball body 4 as the axial cord, a diffusion confusion section of the valve cavity of the left valve body 7 starts from the left diffusion confusion starting point H and ends at the left diffusion confusion terminal G, the inner surface of the valve cavity of the left cavity 7 from a valve cavity inlet I to the left diffusion confusion starting point H is a cylindrical surface, the valve cavity of the left valve body 7 from the left diffusion confusion starting point H to the left diffusion confusion end point G is a conical surface, the valve cavity of the right valve body 1 from a right diffusion confusion start point D to a right diffusion confusion terminal B is a conical surface, and the valve cavity form the right diffusion confusion terminal B to a valve cavity outlet A of the right valve body 1 is a cylindrical surface.

Description

A kind of ball-valve structure

Technical field

The utility model 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

The purpose of this utility model 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 utility model is a kind of ball-valve structure, 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 center line 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, center line 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 utility model 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 the utility model ball valve, 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 utility model 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 center line 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, center line 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 circulation area on the curved surface supercharging sieve 2 is not more than 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. ball-valve structure, 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), center line (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 '), center line (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 structure 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 structure 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 structure 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. ball-valve structure according to claim 2 is characterized in that curved surface supercharging sieve (2) goes up sieve diameter and be not less than 2mm, and the circulation area on the curved surface supercharging sieve (2) is not more than left valve barrel (7) valve pocket inlet (I) and locates 0.7 times of circulation area.