A kind of end cap of ball valve
The present invention relates to the technical field of ball valve port sealing more particularly to a kind of end caps of ball valve.
Here ball valve refers mainly to polyethylene ball valve, and polyethylene ball valve is going out as the open-close on-off in gas distributing system
It requires otherwise to have biggish security risk by air tightness test before factory.Existing ball valve leak test plant is airtight in progress
Property test when, often clamp ball valve both ends using the force application apparatus such as cylinder, jack, then be filled with air pressure toward ball valve inner cavity and surveyed
Examination, but polyethylene ball valve is plastic material, axially loaded be easy to cause ball valve to deform, influences test result.
Summary of the invention
The present invention can press to ball valve both ends, cause ball to solve existing ball valve leak test plant when testing
The problem of valve deformation influences test result, proposes that one kind makes ball valve both ends by axial force, not improve the ball valve sealing of measuring accuracy
To achieve the goals above, the invention adopts the following technical scheme: a kind of end cap of ball valve, includes at least driving
Plate, push plate and sealing cover, the push plate pass through between the driving plate and push plate between driving plate and sealing cover
Several connecting rods are fixedly connected, and are connected between the push plate and sealing cover by several first springs；
In horizontal cylindric, sealing cover is equipped with far from its axis of a lateral edge of push plate to be stretched the sealing cover for ball valve adapter tube
The preceding socket entered, the bottom surface of the preceding socket, which is run through, is equipped with pressurization aeration aperture, and the opening of preceding socket is equipped with a sealing ring and one
Pressure ring, the pressure ring can be translated along the central axis of preceding socket in preceding socket, be equipped in the preceding socket along sealing cover
Central axis is in expand the first annular inclined-plane of shape, and it is in expand shape that the left end of the pressure ring, which is equipped with the central axis along pressure ring,
Second ring inclined-plane forms sealing for positioning seal ring and in a ring between the first annular inclined-plane and the second annular slope
Locating slot is enclosed, the sealing ring is located in sealing ring locating slot, and the front end of pressure ring stretches out in the front end face of sealing cover.
Preferably, the sealing ring is O-ring seal.
Preferably, the aperture of the preceding socket is equal with the internal diameter of pressure ring.
Preferably, the downside of the push plate is equipped with a gas circuit linker, the gas circuit linker includes outside linker
Cylinder, linker piston and linker piston rod, in a tubular form, the outer wall and push plate of linker outer cylinder are solid for the linker outer cylinder
It is fixed, the central axis of linker outer cylinder and the centerline axis parallel of sealing cover, on linker outer cylinder with preceding socket openings direction one
One end of cause is equipped with front end-plate, and the other end is equipped with end plate, offers piston rod through hole, the end plate on the front end-plate
It is equipped with air equalizer opening；The linker piston is set in linker outer cylinder and is to be slidingly sealed with the inner wall of linker outer cylinder
Cooperation, one end of the linker piston rod are fixed with one end end face of linker piston, and the other end passes through piston rod through hole
The outside of linker outer cylinder is stretched in, and is to be slidingly sealed cooperation between linker piston rod and piston rod through hole；Linker is living
Piston returning spring is equipped between the other end and end plate of plug；On the linker outer cylinder through inside and outside wall be equipped with linker into
Stomata and linker venthole, pressurization of the linker venthole between linker piston and front end-plate and with sealing cover
Aeration aperture connection, the linker air inlet is between linker piston and end plate and external air source connects.
Preferably, one end that the linker piston rod is not connect with linker piston is equipped with buffer stopper.
Therefore, sealing is realized the invention has the following beneficial effects: 1, by holding ball valve adapter tube outer wall tightly, ball valve is axial not
Stress improves measuring accuracy；2, gas circuit linker is set, after sealing is realized in ball valve port, automatic air entraining, the degree of automation
It is high；3, structure is simple, and manufacturing cost is low, easy to operate.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention.
Fig. 2 is the structural schematic diagram of another angle of the present invention.
Fig. 3 is cross-sectional view of the invention.
Fig. 4 is the cross-sectional view of linker outer cylinder in the present invention.
Fig. 5 is the overall structure diagram of test mode of the present invention.
Fig. 6 is the partial enlarged view of test mode of the present invention.
Fig. 7 is the partial top view of test mode of the present invention.
Fig. 8 is the cross-sectional view of test mode of the present invention.
1: driving plate；2: push plate；3: sealing cover；4: connecting rod；5: the first springs；6: pressure ring；7: preceding socket；8: sealing
Circle；9: first annular inclined-plane；10: the second annular slopes；11: sealing ring locating slot；12: gas circuit linker；13: outside linker
Cylinder；14: linker piston；15: piston returning spring；16: linker piston rod；17: linker venthole；18: linker into
Stomata；19: front end-plate；20: end plate；21: piston rod through hole；22: air equalizer opening；23: buffer stopper；24: pressurization inflation
Hole；25: ball valve；26: positioning frame；27: left positioning seat；28: right positioning seat；29: left limited bayonet；30: right limited bayonet；
31: left polished rod.
The present invention will be further described with specific embodiment with reference to the accompanying drawing.
A kind of end cap of ball valve, referring to Fig. 1 to Fig. 8, from front to back successively include sealing cover 3, push plate 2 and driving plate 1,
The push plate 2 connects between driving plate 1 and push plate 2 by the way that two connecting rods 4 are fixed between driving plate 1 and sealing cover 3
It connects, passes through two first spring, 5 elastic connections between the push plate 2 and sealing cover 3.
In horizontal cylindric, sealing cover 3 is equipped with far from its axis of a lateral edge of push plate 2 and is used for ball the sealing cover 3
Valve 25 takes over the preceding socket 7 protruded into, and the caliber size of the preceding socket 7 is matched with the outer diameter that ball valve 25 is taken over, before described
The bottom surface of socket 7, which is run through, is equipped with pressurization aeration aperture 24, and the opening of preceding socket 7 is equipped with a sealing ring 8 and a pressure ring 6, described close
Seal 8 is O-ring seal, and the aperture of the preceding socket 7 is equal with the internal diameter of pressure ring 6, and pressure ring 6 can be in preceding socket 7 along preceding
The central axis of socket 7 translates, be equipped in the preceding socket 7 central axis along sealing cover 3 be in expand shape it is first annular tiltedly
Face 9, the rear end of the pressure ring 6 is in the second annular slope 10 for expanding shape equipped with the central axis along pressure ring 6, described first annular
Sealing ring locating slot 11 for positioning seal ring 8 and in a ring, the sealing are formed between inclined-plane 9 and the second annular slope 10
Circle 8 is located in sealing ring locating slot 11, and the front end of pressure ring 6 stretches out in the front end face of sealing cover 3.
The downside of the push plate 2 be equipped with a gas circuit linker 12, the gas circuit linker 12 include linker outer cylinder 13,
Linker piston 14 and linker piston rod 16, the linker outer cylinder 13 in a tubular form, the outer wall of linker outer cylinder 13 and pushing
Plate 2 is fixed, the central axis of linker outer cylinder 13 and the centerline axis parallel of sealing cover 3, on linker outer cylinder 13 with preceding socket 7
The consistent one end of opening direction is equipped with front end-plate 19, and the other end is equipped with end plate 20, offers piston rod on the front end-plate 19
Through hole 21, the end plate 20 are equipped with air equalizer opening 22.The linker piston 14 be set to linker outer cylinder 13 in and
Inner wall with linker outer cylinder 13 is to be slidingly sealed cooperation, one end of the linker piston rod 16 and the one of linker piston 14
End end face is fixed, and the other end passes through piston rod through hole 21 and stretches in the outside of linker outer cylinder 13, and linker piston rod 16 with
It is to be slidingly sealed cooperation between piston rod through hole 21；It is returned between the other end and end plate 20 of linker piston 14 equipped with piston
Multiple spring 15；It is equipped with linker air inlet 18 and linker venthole 17 through inside and outside wall on the linker outer cylinder 13, it is described
Linker venthole 17 is connected between linker piston 14 and front end-plate 19 and with the pressurization aeration aperture 24 of sealing cover 3, institute
Linker air inlet 18 is stated between linker piston 14 and end plate 20 and external air source connects.Under non-test state, even
It is not connected between logical device venthole 17 and linker air inlet 18 by the partition of linker piston 14；When linker piston rod 16 by
When driving force backward, the linker piston 14 is slidably to the rear side of linker venthole 17, so that linker venthole
17 with linker air inlet 18 to be respectively positioned on linker piston 14 ipsilateral and be connected to.
When test, linker air inlet 18 is connect by tracheae with external air source, by the Spool rotating of ball valve 25 to be measured
It is connected on a positioning frame 26 to closed state, then by ball valve 25, the positioning frame 26 includes a left positioning seat 27
With a right positioning seat 28, the left positioning seat and right positioning seat or so are oppositely arranged, and left positioning seat is equipped with for positioning ball
The left limited bayonet 29 of the left adapter tube of valve, right positioning seat are equipped with the right limited bayonet 30 for positioning the right adapter tube of ball valve 25；It is described
Left limited bayonet and right limited bayonet are the U-shaped card mouth of upward opening, size and the left adapter tube of ball valve 25 of left limited bayonet
Outer diameter matching, the size of right limited bayonet are matched with the outer diameter of the left adapter tube of ball valve 25.The left adapter tube of ball valve 25 is clamped
On the left limited bayonet of left positioning seat, the right adapter tube of ball valve 25 is connected on the right limited bayonet of right positioning seat.The left positioning
Two left polished rods 31 are laterally fixed on the left side of seat 27, two left polished rods 31 are arranged in parallel, the left and right two of the push plate 2
Side is respectively provided with a push plate pilot hole, and two push plate pilot holes are corresponded and are slidably matched with two left polished rods 31, described
The left and right sides of sealing cover 3 is respectively provided with a sealing cover pilot hole, and two sealing cover pilot holes and two left polished rods 31 correspond
And be slidably matched, push plate and left sealing cover pass through two left polished rods and play guiding role.
The preceding socket 7 of sealing cover 3 pushes driving plate 1 towards ball valve left end end, using power sources such as lead screw motor, cylinders
Mobile toward 25 direction of ball valve, in the process of moving, push plate 2 and sealing cover 3 can also move together driving plate 1 with driving plate 1
Dynamic, in 3 moving process of sealing cover, the left adapter tube of ball valve 25 can protrude into the preceding socket 7 of sealing cover 3, and sealing cover 3 continues to move to, pressure
6 leading flank of ring can be contradicted with left 27 left side of positioning seat, at this point, pressure ring 6 stops movement, sealing cover 3 is continued to move to, first annular
Spacing between inclined-plane 9 and the second annular slope 10 is gradually reduced, and the sealing ring 8 in sealing ring locating slot 11 is by first annular oblique
Face 9 and the second annular slope 10 are pressed against contract, hold the left adapter tube outer wall of ball valve 25 tightly and realize with the left adapter tube outer wall of ball valve 25
Sealing, then, sealing cover 3 also stop movement.Push plate 2 then continues to move to, compress the first spring 5, gas circuit linker 12 also with
Push plate 2 continue to move to, during gas circuit linker 12 continues to move to, the front end of linker piston rod 16 also with left positioning
The left side of seat 27 contradicts, and linker piston rod 16 and linker piston 14 are blocked stopping and move forward, and linker outer cylinder 13
It is then continued to move to push plate 2, the beginning of piston returning spring 15 is compressed, when linker piston 14 is relative to linker outer cylinder 13
When being moved to linker 17 rear side of venthole, before linker venthole 17 is respectively positioned on linker piston 14 with linker air inlet 18
Side is simultaneously connected to.External air source just can pass sequentially through linker air inlet 18, linker venthole 17 and pressurization aeration aperture 24, most
Enter in 25 left chamber of ball valve eventually, increases the air pressure in 25 left chamber of ball valve as measuring air pressure.At this point, operator need to only use it
Whether its 25 right end of sealing device seal ball-valve judges ball valve 25 by the air pressure change in the monitoring right adapter tube cavity of ball valve 25
Leakage.When the atmospheric pressure value in the right adapter tube cavity of ball valve 25 constantly increases, illustrate there is gas to pass through 25 valve of ball valve in 25 left chamber of ball valve
Core flow to 25 right chamber of ball valve, i.e., the ball valve 25 has leakage；When the atmospheric pressure value in the right adapter tube cavity of ball valve 25 remains unchanged, then say
It is flow to 25 right chamber of ball valve without gas in bright 25 left chamber of ball valve, i.e., the ball valve 25 is qualification.