CN2789520Y - Pneumatic fast cut-off valve - Google Patents

Abstract

The utility model relates to a pneumatic fast cut-off valve, which has the advantages of fast cutting speed, good tightness and long service life. The utility model comprises a cylinder and a valve main body, wherein the valve main body comprises an upper valve cover, a valve core and a valve body; the valve body is provided with a flow channel; a cylinder seat of the cylinder is connected with the upper valve cover through a supporting frame; a piston rod of the cylinder penetrates through the supporting frame and the upper cover and is connected with the valve core. The utility model is characterized in that the exterior of the valve core is provided with a sleeve barrel; the interior and the exterior of the circumferenceare of the sleeve barrel are communicated with each other; the circumference of the sleeve barrel faces to an inlet of the flow channel of the valve body; the sleeve barrel is arranged on a valve seat; the valve seat is inlaid in the valve body; a valve seat ring is embedded between the sleeve barrel and the valve seat; a conical valve head of the valve core is in contact with a conical valve opening of the valve seat and a sealed ring of the valve seat; the flow channel of the valve body is closed down by the conical valve head; at the other side of the piston rod, a piston is connected with screw rod components through driving members; at the circumference of the driving members, springs are connected between the piston and a cylinder cover; the screw rod components are engaged with a screw rod arranged on the cylinder cover; the top of the screw rod components is provided with a handwheel.

Description

Pneumatic repid cut-off valve

(1) technical field

The utility model relates to the instrument valve field, is specially pneumatic repid cut-off valve.

(2) background technique

The structure of existing pneumatic repid cut-off valve is seen Fig. 1, it comprises valve body 6, spherical valve core 7, spool 7 is installed on valve seat 8, valve seat 8 is flush-mounted in valve body 6, cylindrical hole in the spool 7 communicates with the through hole of outside valve seat 8, valve body 6, spool 7 connects valve rod 5, and valve rod 5 connects pneumatic actuator 1 by contiguous block 3, coupling shaft 2.Rotate when source of the gas drives coupling shaft 2 by pneumatic actuator 1, coupling shaft 2 drives valve rod 5, spool 7 turns over certain angle, realizes the opening and closing of spherical valve, and 4 is support.The shortcoming of this cut-off valve has two: 1, and in the process of cutting off, owing to be subjected to the resistance of fluid and sealing surface, cut-off velocity is not rapid; 2, at the seal aspect of cut-off valve, because valve seat 8 needs closely to contact with the sphere of spherical valve core 7, surface of contact is big, and resistance is big, and it is also big to wear and tear, and long-time action back sealability reduces, and produces and leaks, thereby have influence on working life.

(3) summary of the invention

At existing pneumatic repid cut-off valve, cut-off velocity is not rapid; Valve seat closely contacts with the spool sphere, and surface of contact is big, and it is also big to wear and tear, and long-time action back sealability reduces, produce leakage, thereby have influence on the shortcoming in working life, the utility model provides another pneumatic repid cut-off valve, its cut-off velocity is fast, good seal performance, and working life is longer.

Its technological scheme is such: it comprises cylinder, valve body, described valve body comprises bonnet, spool, valve body, described valve body is provided with the fluid passage, the cylinder seat of described cylinder is connected with bonnet by support, the piston rod of described cylinder passes support, connect spool behind the bonnet, it is characterized in that: the outer installment of described spool has sleeve, described sleeve perimembranous is inside and outside to be communicated with, the perimembranous of described sleeve is in face of the fluid passage inlet of described valve body, described sleeve is installed on valve seat, described valve seat insert is in valve body, be embedded with seat ring between described sleeve and the described valve seat, the cone-shaped valve head of described spool contacts with the taper valve port and the seat ring sealing of valve seat, described cone-shaped valve head seals the fluid passage of described valve body, opposite side at described piston rod, described piston connects screw component by driving component, perimembranous at described driving component, be connected with spring between described piston and the cylinder head, described screw component and the screw mandrel engagement that is installed on above the cylinder head, the top of described screw component is equipped with handwheel.

The utility model adopts after the said structure, when the needs fast shut-off is closed, cuts off source of the gas, the resetting of spring can promote piston fast and spool moves down fast, simultaneously, flowing liquid enters behind the sleeve valve hole part is produced downward active force, thereby can fast shut-off; And spool seals with valve seat and seat ring and contacts, and strengthened sealability greatly, though between wearing and tearing are arranged, the resiliently deformable of seat ring can remedy, and has guaranteed sealability, thereby has prolonged the working life of cut-off valve greatly.

(4) description of drawings

Fig. 1 is the structural representation of existing cut-off valve;

Fig. 2 is a structural representation of the present utility model;

Fig. 3 is the enlarged view of A among Fig. 2.

(5) embodiment

See Fig. 2, Fig. 3, the utility model comprises cylinder, valve body, valve body comprises bonnet 13, spool 14, valve body 18, valve body 18 is provided with fluid passage 19, the cylinder seat 9 of cylinder 5 is connected with bonnet 13 by support 12, the piston rod 10 of cylinder 5 passes support 12, bonnet 13 backs connect spool 14, the outer installment of spool 14 has sleeve 15, sleeve 15 perimembranous are inside and outside to be communicated with, and the perimembranous of sleeve 15 is in face of the inlet of the fluid passage 19 of valve body 18, and sleeve 15 is installed on valve seat 17, valve seat 17 inserts are in valve body 18, be embedded with seat ring 16 between sleeve 15 and the valve seat 17, the cone-shaped valve head 20 of spool 14 contacts the fluid passage 19 in cone-shaped valve head 20 closed valves with the taper valve port of valve seat 17 and seat ring 16 sealings, opposite side at piston rod 10, piston 8 connects screw component 3 by driving component 6, in the perimembranous of driving component 6, is connected with spring 7 between piston 8 and the cylinder head 4, screw component 3 and screw mandrel 2 engagements that are installed on above the cylinder head 4, the top of screw component 3 is equipped with handwheel 1.11 slit nuts not.Describe course of action of the present utility model below in conjunction with Fig. 2, the rotating band movable wire bar assembly 3 of handwheel 1, driving component 6, piston 8, piston rod 10 move up and down, and when source of the gas cuts off, can pass through the Kai Heguan of the rotation quick control cut-off valve of handwheel 1.When ventilating in the cylinder 5, piston 8 drives piston rods 10 and moves upward, and piston rod 10 drives spools 14 by slit nut 11 and also moves upward, thereby cut-off valve is opened; When not feeding source of the gas in the cylinder 5, the spring 7 promotion pistons 8 of compression, piston rod 10, spool 14 move downward, and meanwhile, the fluid in the fluid passage 19 enters sleeve 15 from the sidepiece of sleeve 15, valve head 20 is produced downward power, make cut-off valve can quick closedown, do not have and leak.This cut-off valve has two seals: the sealing of first road is exactly the effect of 20 pairs of valve seats 17 of valve head, by grinding, both are closely contacted, the sealing of second road is exactly: by the effect of 20 pairs of seat rings 16 of valve head, make seat ring 16 produce resiliently deformable, surface of contact between the assurance is complete, and sealability is better.By two seals, less like this to the collapsing force of sealing surface, the wearing and tearing of the first road sealing surface can be through the resiliently deformable of the second road seal valve seat ring remedy, thereby prolong working life of repid cut-off valve greatly.

Claims (1)

1, pneumatic repid cut-off valve, it comprises cylinder, valve body, described valve body comprises bonnet, spool, valve body, described valve body is provided with the fluid passage, the cylinder seat of described cylinder is connected with bonnet by support, the piston rod of described cylinder passes support, connect spool behind the bonnet, it is characterized in that: the outer installment of described spool has sleeve, described sleeve perimembranous is inside and outside to be communicated with, the perimembranous of described sleeve is in face of the fluid passage inlet of described valve body, described sleeve is installed on valve seat, described valve seat insert is in valve body, be embedded with seat ring between described sleeve and the described valve seat, the cone-shaped valve head of described spool contacts with the taper valve port and the seat ring sealing of valve seat, described cone-shaped valve head seals the fluid passage of described valve body, opposite side at described piston rod, described piston connects screw component by driving component, perimembranous at described driving component, be connected with spring between described piston and the cylinder head, described screw component and the screw mandrel engagement that is installed on above the cylinder head, the top of described screw component is equipped with handwheel.