CN2355176Y

CN2355176Y - Frictionfree twin core ball valve

Info

Publication number: CN2355176Y
Application number: CN 98232047
Authority: CN
Inventors: 张桥
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-12-26
Filing date: 1998-12-26
Publication date: 1999-12-22
Anticipated expiration: 2008-12-26

Abstract

The utility model provides a frictionfree twin core ball valve which has the advantages of flexible switching, good tightness and long service life. The utility model is composed of a valve body, a lower sleeve, a valve core, a valve rod, an upper sleeve, a valve cover, filler, a valve rod travel range actuating mechanism, etc., wherein, the valve core is composed of two semisphere valve cores. The two semisphere valve cores are connected with a spring mechanism integrally, and a front rob head of the valve rod is a double inclined plane structure. The structure is equivalent to two ordinary ball valves connected in series, increasing sealing effect and reliability, improving disadvantageous situation of stress of the valve rod cantilever, decreasing scouring effect to the sealing surface, and prolonging the service life of the ball valve.

Description

A kind of nothing friction twin-core ball valve

The utility model relates to the valve of liquid break-make in the control conveyance conduit, the general ball valve of particularly a kind of industrial conveyance conduit.

General ball valve is made up of valve body, valve seat, spool and valve rod and Sealing, this ball valve since between valve seat and the spool contact friction in switching process be easy to generate seepage, and increased the resistance of switch valve, valve seat and spherical valve core relative fixed, be difficult to form the rigidity sealing, it is very limited on using.Chinese patent (ZL95215906.6) " a kind of industrial conveyance conduit ball valve " has solved the friction problem that contacts in switching process between the spool in the ordinary ball valve and the valve seat substantially, also has the better seal effect simultaneously.Its deficiency is 1, valve rod is stressed bigger; 2, sealing surface be in will sealing, and have in the seepage when sealing surface, and the high-velocity fluid that the pressure reduction before and after can being turn-offed by pipeline forms wash away and influence the ball valve life-span.

The purpose of this utility model provide a kind of switch flexibly, the nothing friction twin-core ball valve of good seal performance, long service life.

The utility model is mainly by valve body 1, following lining 2, spool 4, valve rod 5, last lining 6, valve gap 7, filler 8, valve rod travel actuator 9 compositions such as grade, spool 4 lower ends are realized dynamic fit with the form of curved surface with following lining 2, spool 4 is complementary with the valve seat 10 that is embedded in the valve body 1, spool 4 upper ends are provided with vertical through holes, on this through hole perisporium roller bolt 11 is housed, helical guide groove 13 is equipped with at the valve rod middle part, valve rod 7 bottleneck positions are provided with the screw 14 that can be complementary with helical guide groove 13, it is characterized in that described spool 4 is made up of two hemisphere spools, two hemisphere spools and spring mechanism 16 are connected as a single entity, and the forward bar of described valve rod 5 12 is the double inclined plane structure.

Aforesaid nothing friction twin-core ball valve, its characteristics are that the surperficial contact position of described spool 4 spheres and valve seat 10 is provided with cemented carbide sealing surface 15.

Advantage of the present utility model is: when 1, ball valve is opened, at first move on the valve rod, two semispherical valves close up to the centre under the effect of spring force, thereby make spool leave left and right sides valve seat, the rotating band movable valve plug of valve rod rotates then, thereby ball valve is opened, and this nothing friction ball valve is equivalent to two ordinary ball valve polyphones, has improved sealing effect and reliability greatly; 2, after the utility model changes valve rod into bi-directional compression power, improved the unfavorable situation of valve rod cantilever force in the background technique; 3, the utility model is owing to be while left and right sides dual face seals, so will form in the sealing, from about the liquid speed that flows through of two sealing surfaces little more a lot of than the described ball valve of background technique, thereby reduce souring greatly to sealing surface, help ball valve and prolong working life; 4, when a sealing surface generation of ball valve seepage, another sealing surface can also effectively seal, and can stop because of seepage further washing away its sealing surface.

Fig. 1 is a plan view of the present utility model;

Fig. 2 is the A--A sectional view, is closed state between spool and the valve seat among the figure;

Fig. 3 is the A--A sectional view, is half-open position between spool and the valve seat among the figure;

Fig. 4 is the A--A sectional view, is full-gear between spool and the valve seat among the figure;

Fig. 5 is the valve core structure schematic representation.

The utility model is further specified as follows below in conjunction with accompanying drawing:

Extremely shown in Figure 5 as Fig. 1, the utility model comprises the valve body 1 of being with the fluid passage, the body cavity bottom is provided with down lining 2, described valve body 1 inner chamber is provided with two hemisphere spools 4 of band horizontal through hole, realize movingly with curved surface form and following lining 2 on the anchor plate surface of described spool lower end, spool 4 is complementary with the left and right sides valve seat 10 that is embedded in the

valve body

1, and 17 is the valve seat plug-in part.The crushing of 4 pairs of valve seats 10 of spool when closing in order to alleviate ball valve, hard alloy overlay welding one withstand voltage circle sealing surface 15 can be used in the sphere contact position of described valve base surface and spool, the upper end of spool 4 is provided with vertical through holes, be provided with a pair of roller bolt 11 in the vertical through holes, horizontal through hole is axially consistent in the axial and spool 4 of described roller bolt, the lower end of valve rod 5 is made and is with bibeveled bar head 12, valve rod 5 and bar head 12 can separately be made, and help eliminating the asymmetric error of left and right sides spool and valve seat existence in making and installing like this.The bar head 12 of described valve rod 5 stretches in the vertical through holes of spool 4, and described pair of hemisphere spool 4 links together with spring assembly 16, makes the inclined-plane of bar head 12 be close to roller bolt 11 formation movingly.The periphery of valve rod 5 is with lining 6, valve gap 7, the middle part of described valve rod is provided with helical guide groove 13, the bottleneck position of valve gap 7 is provided with the screw 14 that can be complementary with helical guide groove 13 motion, the central angle in the relative valve rod of the horizontal projection of described helical guide groove axle center is 90 degree preferably, and the spool 4 and the folding of valve seat 10 can correctly be located.

The utility model in use, and is first with valve channel two ends access industrial conveyance conduit, termination valve rod travel actuator 9 on the valve rod 5.Valve rod 5 is under the drive of actuator, descending and turn over an angle, valve rod 5 goed deep into spool 4 and spool was rotated on the lining down this moment, when horizontal through hole in the spool 4 axially with valve body 1 fluid passage axially mutual vertical the time, valve rod 5 no longer rotates and continues descending, inclined-plane on the valve club head 12 compresses roller bolt 11, and roller bolt 11 forces the ball surface of two hemisphere spools to compress left and right sides valve seat 10 again, thereby reaches the purpose that blocking-up conveyance conduit inner fluid flows.

Valve rod is along with actuator 9 is up, retreat in the vertical through holes of valve club head 12 by spool 4 upper ends, under the spring mechanism effect, roller bolt 11 glides relatively along valve club head 12 inclined-planes, spool 4 balls surfaces and left and right sides valve seat are disengaged, valve rod 5 continues the up angle that turns over simultaneously then, when valve rod 5 rises to the extreme higher position, valve rod turns over an angle of 90 degrees, the spool 4 that rotates also turns over an an angle of 90 degrees synchronously, axial axial consistent with valve body 1 fluid passage of the horizontal through hole of this moment in the spool 4, ball valve is in the standard-sized sheet working state.

Claims

1, a kind of nothing friction twin-core ball valve, mainly by valve body (1), following lining (2), spool (4), valve rod (5), last lining (6), valve gap (7), filler (8), valve rod travel actuator compositions such as (9), spool (4) lower end is realized dynamic fit with the form of curved surface with following lining (2), spool (4) lower end is complementary with the valve seat (10) that is embedded in the valve body (1), spool (4) upper end is provided with vertical through holes, roller bolt (11) is housed on this through hole perisporium, helical guide groove (13) is equipped with at the valve rod middle part, valve gap (7) bottleneck position is provided with the screw (14) that can be complementary with helical guide groove (13), it is characterized in that described spool (4) is made up of two hemisphere spools, two hemisphere spools are connected as a single entity with spring mechanism (16), and the forward bar head (12) of described valve rod (5) is the double inclined plane structure.

2, nothing friction twin-core ball valve according to claim 1 is characterized in that the surperficial contact position of described spool (4) sphere and valve seat (10) is provided with cemented carbide sealing surface (15).