CN202708166U

CN202708166U - Ball valve

Info

Publication number: CN202708166U
Application number: CN 201220347283
Authority: CN
Inventors: 黄思维
Original assignee: Shanghai Kaike Valve Manufacturing Co Ltd
Current assignee: Shanghai Kaike Valve Manufacturing Co Ltd
Priority date: 2012-07-18
Filing date: 2012-07-18
Publication date: 2013-01-30
Anticipated expiration: 2022-07-18

Abstract

The utility model relates to a valve, and in particular relates to a ball valve. The ball valve comprises a valve body, a valve core and a valve rod. The ball valve further comprises a spring and a spring seat, wherein the spring is arranged on the external wall of the valve rod in a sleeving way; the spring seat is connected with the spring; the valve core comprises two hemispheres; one of the sides of the two hemispheres is pivoted with the spring seat; one end of the spring is welded to the spring seat while the other end of the spring is welded on a boss of the valve rod; one end part of the valve rod is inserted into a hole of the spring seat; and the hole is corresponding to the section of the end part in shape. The ball valve is reliable and stable in sealing and flexible in on-off action. The ball valve has the advantages that two hemispheres are rotated relative to the valve seat without friction when the valve core of the ball valve is rotated, and little resistance is transmitted to a flywheel, so that the ball valve is flexible in the on-off action.

Description

Ball valve

Technical field

The utility model relates to a kind of valve, relates in particular to a kind of ball valve and realizes spool in the ball valve and the method for the hard sealing of valve seat.

Background technique

Ball valve is a kind of valve with spherical valve core, and after it was opened fully, can be fluid provided resistance very little, straight-through runner; When this spherical valve core rotates to an angle, all present sphere in the inlet and outlet of valve body, thereby block mobile.Only need very little moment of rotation when operating this valve, its compact structure, easy operating and maintenance, suitable directly the work open and close use, also can do throttling, is widely used in engineering.

Referring to Fig. 8 ~ Fig. 9, existing ball valve mainly is comprised of valve body 81, valve seat 82 and spherical valve core 83, when spherical valve core 83 is in closed condition, be resisted against spring 84 on the valve body 81 to the prolonging direction of this spring extruding valve seat 82, so that valve seat 82 and spherical valve core 83 close contacts form hard sealing between them.The defective of this kind ball valve is, in the switching process of valve, in very strong friction relative movement occurs all the time between valve seat 82 and the spherical valve core 83, and valve seat 82 or spherical valve core 83 damage in long-term using process easily; Although can adopt the materials such as STL, HS111, HS112, spray cobalt base hard alloy to improve the hardness of sphere and valve seat surface, but still can not guarantee between valve seat 82 and the spherical valve core 83 stability of sealing;

And what the effect of this hard sealing relied on only is the extruding of spring 84, and in order to take into account the needs of flexible rotating between valve seat 82 and the spherical valve core 83, this extruding force can not be very large, so can not guarantee the reliability of sealing between valve seat 82 and the spherical valve core 83;

In addition, in the existing mode of structure, because between valve seat 82 and the spherical valve core 83 in very strong friction relative movement occurs all the time, also so that the switch motion of ball valve is very dumb.

The model utility content

The technical problems to be solved in the utility model provides a kind of stable ball valve that seals.

Ball valve of the present utility model comprises valve body, spool, valve rod and handwheel, and valve rod is with movable valve plug to rotate relative to valve body under the driving of handwheel, it is characterized in that: this ball valve also comprises the spring that is placed in the valve rod outer wall and the spring seat that links to each other with this spring; Described spool is comprised of two hemisphere, and a side and the described spring seat of these two hemisphere are articulated; One end of described spring welds mutually with this spring seat, and the other end is welded on the boss of valve rod; Insert in described spring seat and the corresponding hole of sectional shape this end one end of this valve rod.

The end of described valve rod is oval, and it inserts in the oval-shaped hole of spring seat.

The end of described valve rod is triangle, and it inserts in the leg-of-mutton hole of spring seat.

The other end of described valve rod has outside thread, and it is sleeved in the nut that is fixedly linked with described handwheel, to realize moving up and down of valve rod.

The outer wall of described valve rod is provided with by vertical section and oblique section rail slot that combines, and is provided with ball in this rail slot, to realize the rotation of valve rod.

When spring seat of the present utility model moves up and down, can be so that each hemisphere rotate around the drive-connecting shaft of itself and rotating disc, thereby the applying of the sphere of hemisphere and valve seat can be more and more tighter; After ball valve turned to and reaches closed state, the applying of described sphere and valve seat became more and more tighter, and its extruding force can significantly increase, so that the sealing of ball valve is very reliable; When ball valve turns in the opening state process, hemisphere and valve seat break away from, and two relative valve seats of hemisphere are without frictionally rotation, until reach opening state, thereby hemisphere and valve seat can not wear and tear, and the sealing of ball valve is also very stable; The spool of ball valve of the present utility model is in rotation process, because two relative valve seats of hemisphere are without frictionally rotation, the resistance that passes to handwheel is very little, thereby the switch motion of ball valve is very flexible.

Description of drawings

Fig. 1 is the ssembly drawing of ball valve of the present utility model;

Fig. 2 is the sectional view of hemisphere of the present utility model;

Fig. 3 is the left view of Fig. 2;

Fig. 4 is the cross-sectional view of valve rod of the present utility model;

Fig. 5 is the front view of spring seat of the present utility model;

Fig. 6 is the plan view of Fig. 5;

Fig. 7 is the structure partial schematic representation of valve rod of the present utility model, has shown the structure of rail slot;

Fig. 8 is existing ball valve ssembly drawing;

Fig. 9 is the partial enlarged drawing of Fig. 8.

Embodiment

Now in conjunction with the accompanying drawings and embodiments the utility model is described in further detail.

Referring to Fig. 1 ~ Fig. 3, ball valve of the present utility model mainly is comprised of valve body 10, rotating disc 20, hemisphere 30, spring 55, spring seat 40, valve rod 50, support 60, nut 70, handwheel 80; Its working principle roughly is: valve rod 50 relative support 60 under the mating reaction of handwheel 80 and nut 70 moves up and down and rotates, driving hemisphere 30 by spring 55 and spring seat 40 both rotated around the axis of valve rod 50, drive-connecting shaft around itself and rotating disc 20 rotates again, thereby realizes the unlatching of ball valve.

Valve body 10 is provided with inlet passage 11 and outlet passage 12, between the end of inlet passage 11 and outlet passage 12 (valve seat), be provided with two hemisphere 30, the up and down both sides of hemisphere 30 respectively are provided with and connect the ears or side handles of a utensil 31, by connecting the ears or side handles of a utensil 31, one side and the rotating disc 20 of each hemisphere 30 are articulated, and opposite side and spring seat 40 are articulated.Spring seat 40 links to each other with valve rod 50, and it can rotate with valve rod 50; Move up and down with valve rod 50.

When spring seat 40 rotates, can drive two hemisphere and rotate around the axle center of valve rod 50 simultaneously, when forwarding several angle to, owing between two hemisphere enough spaces are arranged, inlet passage 11 and outlet passage 12 are communicated with swimmingly, and ball valve is in opening state; When returning to former angle, the sphere of hemisphere 30 and valve seat are fitted, and can form hard sealing, and ball valve is in closed state.

When spring seat 40 moves up and down, can so that each hemisphere 30 rotate around the drive-connecting shaft of itself and rotating disc 20, thereby the sphere of hemisphere 30 fit with valve seat can be more and more tighter, also can be more and more loose.When ball valve turns in the opening state process, the applying of described sphere and the valve seat more and more pine that becomes, until hemisphere breaks away from valve seat, two relative valve seats of hemisphere reach opening state without frictionally rotating; After ball valve turned to and reaches closed state, the applying of described sphere and valve seat became more and more tighter, and its extruding force can be far longer than the extruding force of the 84 pairs of valve seats 82 of spring in the existing ball valve, so that the sealing of ball valve is very reliable; Again since in the rotation of the relative valve seat of hemisphere without friction, thereby can not wear and tear, the sealing of ball valve is also very stable;

Cooperation is referring to Fig. 4 ~ Fig. 6, and the lower end of valve rod 50 has oval-shaped cross section; Have oval-shaped through hole 400 on the spring seat 40, the lower end of valve rod 50 is sleeved in the through hole 400 of spring seat 40, can guarantee that so spring seat 40 rotates with valve rod 50;

Valve rod 50 can be triangle also with the shape of through hole 400, its objective is to guarantee that spring seat 40 rotates with valve rod 50;

Among Fig. 1, spring 55 is placed in outside the valve rod 50, one end and spring seat 40 welding, and the other end is welded on the boss 51 of valve rod 50, and like this, spring seat 50 can move up and down with valve rod 50; Especially, when valve rod 50 moves down, by being sandwiched in the spring 55 between boss 51 and the spring seat 40, the moving down of the flexibility that the moving down of the valve rod of rigidity is converted into spring seat 40, this has useful technique effect so that there is a kind of buffering effect in the applying process of sphere and valve seat.

Support 60 is fixedly linked with valve body 10, can rotate by relative support 60 with the nut 70 that handwheel 80 is fixedly linked, but upper-lower position is defined; Outside thread 59 on the valve rod 50 and the internal screw-thread screw of nut 70 when rotation hand wheel 80, can be realized moving up and down of valve rod 50;

Cooperation is referring to Fig. 7, and valve rod 50 is provided with rail slot 52, and this rail slot 52 is combined by vertical section 521 and oblique section 522, and the ball 53 relative supports 60 that are positioned at rail slot 52 remain static.When valve rod 50 moved up and down, if ball 53 enters oblique section 522, then ball 53 pushed the inwall of rail slots 52, generation makes the moment of valve rod 50 rotations, thereby during rotation hand wheel 80, except realizing the moving up and down of valve rod 50, also realized rotatablely moving of valve rod 50.

The utility model starts valve rod by the nut on the hand wheel rotating support, and valve rod is moved up and down and 90-degree rotation along rail slot, and the spring that designs under the valve rod and spring seat, two hemisphere are moved with valve rod and rotates; When valve rod moves down, spring is afterburning to spring seat, make two connecting rods on the spring seat outwards make for respectively two hemisphere and add thrust, the source of this power is the straight power that handwheel imposes on valve rod, and power is varied to flexibly and vigor flexiblely by the spring under the valve rod, two hemisphere flexiblely are combined with valve seat in valve body, reach the tighter effect of more closing; When moving on the valve rod, spring is loosening, and spring seat is along with moving on the valve rod, make two hemisphere relatively its drive-connecting shaft with rotating disc rotates, distance is therebetween dwindled, and with the valve seat disengaging, then 90-degree rotation makes two hemisphere and valve seat without reaching keying with touching wiping.

The spool of ball valve of the present utility model is in rotation process, because two relative valve seats of hemisphere are without frictionally rotation, the resistance that passes to handwheel 80 is very little, thereby the switch motion of ball valve is very flexible.

The above only is preferred embodiment of the present utility model, be not that the utility model is done any pro forma restriction, although the utility model discloses as above with preferred embodiment, yet be not to limit the utility model, any those skilled in the art, in the scope that does not break away from technical solutions of the utility model, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solutions of the utility model, any simple modification that foundation technical spirit of the present utility model is done above embodiment, equivalent variations and modification all still belong in the scope of technical solutions of the utility model.

Claims

1. a ball valve comprises valve body, spool, valve rod and handwheel, and valve rod is with movable valve plug to rotate relative to valve body under the driving of handwheel, it is characterized in that: this ball valve also comprises the spring that is placed in the valve rod outer wall and the spring seat that links to each other with this spring; Described spool is comprised of two hemisphere, and a side and the described spring seat of these two hemisphere are articulated; One end of described spring welds mutually with this spring seat, and the other end is welded on the boss of valve rod; Insert in described spring seat and the corresponding hole of sectional shape this end one end of this valve rod.

2. ball valve as claimed in claim 1 is characterized in that: the end of described valve rod is for oval, and it inserts in the oval-shaped hole of spring seat.

3. ball valve as claimed in claim 1, it is characterized in that: the end of described valve rod is triangle, it inserts in the leg-of-mutton hole of spring seat.

4. such as the described ball valve of one of claim 1 ~ 3, it is characterized in that: the other end of described valve rod has outside thread, and it is sleeved in the nut that is fixedly linked with described handwheel, to realize moving up and down of valve rod.

5. ball valve as claimed in claim 4, it is characterized in that: the outer wall of described valve rod is provided with by vertical section and oblique section rail slot that combines, and is provided with ball in this rail slot, to realize the rotation of valve rod.