CN202469025U

CN202469025U - Novel butterfly valve

Info

Publication number: CN202469025U
Application number: CN2012200938066U
Authority: CN
Inventors: 许南忠
Original assignee: ZHANGZHOU LIQIANG HARDWARE MACHINERY CO Ltd
Current assignee: ZHANGZHOU LIQIANG HARDWARE MACHINERY CO Ltd
Priority date: 2012-03-14
Filing date: 2012-03-14
Publication date: 2012-10-03
Anticipated expiration: 2022-03-14

Abstract

The utility model provides a novel butterfly valve which comprises a drive shaft, a valve body, a valve plate, a valve rod, a valve seat and a valve seat driving device. The novel butterfly valve is characterized in that the valve body comprises a main valve body and an auxiliary valve body which are hermetically connected through a flange bolt; an upper connecting plate is fixed at the top end of the valve body, an upper external bearing is arranged in a through hole of the upper connecting plate, and the top end of the drive shaft is arranged in a hole of the upper external bearing; the upper and lower ends of the valve rod are connected with the valve plate respectively by using a cone through upper and lower connecting seats; and an axial eccentricity exists between the rotating axis of the valve plate and an auxiliary seal plane so as to form a single eccentric structure. The novel butterfly valve provided by the utility model is designed into a movable valve seat which can axially move along the centerline of the valve body, and due to the unique design, the friction force generated between seal pairs when the valve plate rotates can be effectively avoided, therefore, the opening and closing speeds are increased, and the compaction and good sealing performance of a sealing surface can be effectively guaranteed.

Description

A kind of novel butterfly valve

Technical field

This is novel to relate generally to a kind of butterfly valve.

Background technique

Along with the progress of science and technology, the industrial automation controlling level improves constantly, and this just has higher requirement to the valve body structure; The tradition hard seal butterfly valve has generally included valve body, valve rod, valve plate and valve seat; Valve plate can rotate in valve body, and valve seat is set in the inner circumference of valve body, and the inner ring surface of valve seat is formed sealing pair with the seal ring on the excircle that is set in valve plate; Under the valve closing state, rely on the radial compression of valve plate and the end thrust of forward medium that seal ring is close on the valve seat; Resiliently deformable taking place, produce seal pressure, realizes the sealing between valve plate and valve body.In prior art, under some high-temperature conditions, locating piece and guide sleeve are prone to kill with axle, have increased the frictional force with axle, and transmission shaft is prone to twist off.Owing to structural reason, the seal pressure between sealing pair immobilizes, during the valve plate opening and closing in addition; Always exist friction between sealing pair, make the moment of opening/shutting valve increase, keying speed slows down; Frequent keying causes sealing surface wear easily, and sealability descends, and finally causes valve leak.

Summary of the invention

This novel purpose is to provide a kind of valve seat to move axially along valve body, and seal pressure is even, driving mode is various, and can effectively reduce stuck phenomenon appears in valve in running novel butterfly valve.

The technological scheme that the utility model solve the technical problem is:

A kind of novel butterfly valve comprises transmission shaft, valve body, valve plate, valve rod, valve seat and valve seat drive unit, and said valve body comprises main valve body and auxiliary valve body two-part, is tightly connected by flange bolt; The top of said valve body is fixed with upper junction plate, and the top outboard bearing is installed in the through hole of upper junction plate, and the rotatingshaft top is installed in the hole of top outboard bearing; The upper and lower end of said valve rod connects valve plate with circular cone through upper and lower connecting base respectively; The rotation axis of said valve plate and sealing pair plane exist axially eccentric, become single eccentric structure.

Said valve body internal fixation is provided with seal ring, and said seal ring and valve plate are and are sealed and matched.

Said valve seat drive unit is a gear device, and it comprises: driven gear, starter receiver by the starter receiver transfer driven gear, drive valve seat and move axially.

Said driven gear is installed between main valve body and the auxiliary valve body, and driven gear is a circular ring, and its inner circumference is provided with the internal thread that matches with valve seat one end outside thread.

The usefulness of technique scheme is:

1, being designed to that this is novel can be along the axially movable moving valve base of valve body center line, and this unique design can effectively avoid valve plate when rotating, to produce frictional force between the sealing pair, has improved keying speed, has improved the life-span of the door on valve plate both sides simultaneously.

2, this novel have simple in structure, volume is little, in light weight, characteristics such as switch is rapid, structural orientation is reliable, and is easy to use and applicability is wide.

3, this novel described valve seat drive unit can effectively guarantee compressing and excellent sealing performance of sealing surface.

Below in conjunction with accompanying drawing and specific embodiment to this novel being further described.

Description of drawings

This novel structural representation of Fig. 1.

Fig. 2 is an embodiment's of the utility model a part schematic representation.

Embodiment

A kind of novel butterfly valve as shown in Figure 1, it comprises transmission shaft 1, valve body 2, valve plate 3, valve rod 4, valve seat 5 and valve seat drive unit, it is characterized in that: said valve body 2 comprises main valve body 2.1 and auxiliary valve body 2.2 two-part, is tightly connected by flange bolt; The top of said valve body 2 is fixed with upper junction plate 6, in the through hole 7 of upper junction plate 6, top outboard bearing 8 is installed, and rotatingshaft 1 top is installed in the hole of top outboard bearing 8; The upper and lower end of said valve rod 4 connects valve plate 3 with circular cone through upper and lower connecting base respectively; The rotation axis of said valve plate 3 and sealing pair plane exist axially eccentric, become single eccentric structure.

The upper and lower end of the main valve body 2.1 of this novel said valve body 2 all has upper valve rod hole and the lower valve rod hole that valve rod 4 passes, and said valve rod 4 passes described upper valve rod hole, upper connecting base, lower connecting base successively from the top of main valve body 2.1; The lower valve rod outer end of hole of main valve body 2.1 is provided with down pipe box, is that flange is connected with the lower end cap of sealing with bolt on it, and the flange on the pipe box is connected with support with bolt, and support is skilfully used the drive unit that connects valve rod 4.

This novel said valve body 2 internal fixation are provided with seal ring 9, and said seal ring 9 is with valve plate 3 and is sealed and matched.

This novel said gear device comprises: starter receiver 10 and driven gear 11; Driven gear 11 is a circular ring; Be installed between main valve body 2.1 and the auxiliary valve body 2.2; The central axes of its gyration center and valve body 2; Its inner peripheral surface is provided with the internal thread that matches with the said outside thread of valve seat 5 one ends, and driven gear 11 is moved axially thereby drive valve seat 5 through power screw by starter receiver 10 transmissions; For adapting to the needs that gear device is installed, the shape and structure of said valve body 2 needs simple adaptations, and this accommodation those skilled in the art accomplish easily.

The further characteristic of this novel butterfly valve is that the inner headed face of said valve seat insert 12 is the normal cone face, and the periphery of said valve plate seal ring 9 adopts the normal cone face identical with the inner headed face cone angle of said valve seat insert 12.This designing and manufacturing technique is simple, and cost is low, reliable operation, has excellent sealing performance; Simultaneously also be provided with seal ring, further guarantee the sealing of butterfly valve at the faying surface place that is connected of described main valve body 2.1 and auxiliary valve body 2.2.

This novel butterfly valve has single eccentric structure, and this list eccentric structure is meant between rotation axis and the sealing pair plane of said valve plate 3 and has certain distance that this constitutes single eccentric structure of butterfly valve.

This is novel on the valve top, and upper junction plate is used on attachment post and screw and the valve body 2, top outboard bearing 8 is passed transmission shaft pack in the installation through holes 7 of connecting plate, accomplishes the assembling of valve body, realizes spool locating and leading role of transmission shaft.

The working principle of this novel butterfly valve is:

Gear device drives starter receiver 10 and rotates, and transfer driven gear 11 is rotated counterclockwise; Move right through the central axial direction of power screw drive valve seat 5 along valve body 2; When butterfly valve cut out, after valve plate 3 was turned back to original position, existed certain axial distance between valve seat insert 12 and the valve plate seal ring this moment; But both central axis are in and overlap the position; Unclamp the compressing of valve plate 3, valve seat insert 12 and valve plate seal ring 9 are broken away from, till the feather key on the valve seat 5 one end outer peripheral surfaces touches the right side of valve body keyway 13.

Claims

1. novel butterfly valve, it comprises transmission shaft, valve body, valve plate, valve rod, valve seat and valve seat drive unit, it is characterized in that: said valve body comprises main valve body and auxiliary valve body two-part, is tightly connected by flange bolt; The top of said valve body is fixed with upper junction plate, and the top outboard bearing is installed in the through hole of upper junction plate, and the rotatingshaft top is installed in the hole of top outboard bearing; The upper and lower end of said valve rod connects valve plate with circular cone through upper and lower connecting base respectively; The rotation axis of said valve plate and sealing pair plane exist axially eccentric, become single eccentric structure.

2. according to the described a kind of novel butterfly valve of claim 1, it is characterized in that: said valve body internal fixation is provided with seal ring, and said seal ring and valve plate are and are sealed and matched.

3. according to the described a kind of novel butterfly valve of claim 1, it is characterized in that: said valve seat drive unit is a gear device, and it comprises: driven gear, starter receiver by the starter receiver transfer driven gear, drive valve seat and move axially.

4. according to the described a kind of novel butterfly valve of claim 3, it is characterized in that: said driven gear is installed between main valve body and the auxiliary valve body, and driven gear is a circular ring, and its inner circumference is provided with the internal thread that matches with valve seat one end outside thread.