CN1004099B

CN1004099B - Variable eccentric butterfly valve

Info

Publication number: CN1004099B
Application number: CN86100768.9A
Authority: CN
Inventors: 周建云
Original assignee: Individual
Current assignee: Individual
Priority date: 1986-01-23
Filing date: 1986-01-23
Publication date: 1989-05-03
Also published as: CN86100768A

Abstract

The present invention relates to a variable eccentric butterfly valve which is mainly composed of a valve body, a valve seat, a valve plate, an eccentric shaft (valve rod), etc., wherein the eccentric shaft is thin in the middle and thick at both ends, and distance exists between the shaft center in the middle and the shaft centers at both the two ends. By the action of the eccentric shaft, the working pressure of the butterfly valve is enhanced in the process of opening and closing the butterfly valve, the abrasion of the valve seat is reduced, and the service life of the butterfly valve is extended. The present invention overcomes the defects of the existing butterfly valve. Simultaneously, the butterfly valve is easily opened and closed, and is suitable for production in various factories.

Description

Variable eccentric butterfly valve

The present invention relates to a kind of valve, particularly a kind of butterfly valve.

Butterfly valve is the new valve of large diameter pipeline fluid control.Beginning only is used for the adjusting throttling of pipeline medium, because the development of butterfly valve manufacturing technology has especially been adopted after the sealing of rubber nylon elastomeric material, makes it have the cutout effect, has improved the performance of butterfly valve.Present butterfly valve has generally all possessed adjusting throttling and two kinds of functions of cutout.Though their structural type is various, so-called centre type, single eccentric type, two eccentric type are arranged generally.It is low that present all butterfly valves exist work (sealing) pressure, the weakness that working life is poor, and also after the sealing surface abrasion, seal valve seat and whole butterfly valve will be scrapped, and be very uneconomical.

The present invention proposes for the above-mentioned shortcoming that overcomes existing butterfly valve, the change eccentric-butterfly-valve that is provided can raising work (sealing) pressure with increase the service life.

The present invention is achieved like this, and is equipped with the valve seat with inner conical sealing surface that elastic material is made in valve body, and middle valve plate is to be assemblied on the eccentric shaft of doing to support with an eccentric axle center.Unique distinction of the present invention just is that it has the eccentric shaft of throw of eccentric, and valve plate is connected on the eccentric shaft part of eccentric shaft, and another axle center of eccentric shaft is for supporting the axle center, and eccentric shaft supports the axle center rotation around this, and this supports the axle center and the valve body center line is eccentric.Valve plate is bordering on translation and valve seat rhynchostome or leaves by rotating to eccentric shaft rotation, reaches the effect of closing or opening butterfly valve thus.By this structure, make this butterfly valve when closing, increased working pressure, avoided the interference amount of compression of valve plate and valve base chamber too big when opening, reduced friction, prolonged the life-span, overcome the weakness of existing butterfly valve.Except that These characteristics, it is good also to have a process industrial art performance, and low cost of manufacture opens and closes light, is easy to install and advantage such as guarantee.It had both fitted what integrated mill, the also suitable middle-size and small-size factory process production of what.

The invention will be further described by embodiment below in conjunction with accompanying drawing.

Fig. 1 is the variable eccentric butterfly valve structure and the working principle schematic representation of embodiment provided by the present invention (), and 1-a is the valve plate full-gear, and 1-b is the valve plate closed condition.

Fig. 2-a is the eccentric shaft plan view, 2-1 _bIt is the sectional view of eccentric shaft.

Fig. 3 is the variable eccentric butterfly valve structure and the working principle schematic representation of embodiment provided by the present invention (two), and 3-a is the valve plate full-gear, and 3-b is the valve plate closed condition.

Embodiment (one)

Referring to Fig. 1, variable eccentric butterfly valve comprises valve body (1), valve seat (2), valve plate (3) and eccentric shaft (4) (be valve rod, make driveshaft) etc.Fig. 1-a is the valve plate full-gear, and Fig. 1-b is that valve plate is in closed condition.Wherein eccentric shaft (4) as shown in Figure 2, middle shaft part (4-1) is thin shaft part, its diameter is d, valve plate (3) be fixed on above-mentioned in the middle of on shaft part (4-1); Two ends shaft part (4-2) is identical with (4-3) shaft axis, and its diameter is that D is called thick shaft part, and this axle center is as supporting the axle center, and eccentric shaft (4) can be around this axle center rotation.There is a throw of eccentric E in the axle center of the axle center of middle shaft part (4-1) and two ends shaft part (4-2), (4-3).General D 〉=d+2E.Middle shaft part can be established the installation jack, so as with valve plate by the latch structure (not shown) that links to each other, also available other modes connect.The size of throw of eccentric E is selected according to the elasticity and required work (sealing) pressure of pipe diameter size and seat material.For the pipe diameter of inside nominal diameter DN50mm～3000mm, E can be 3～50mm, also can set up on their own.This eccentric shaft can process on an integral shaft, also can segmentation processing be assembled into one to form again, and this needs be decided by mounting process.As can be seen from Figure 1, just because of eccentric shaft has throw of eccentric E, when valve plate is in full-gear shown in Fig. 1-a the time, this butterfly valve is two eccentric types, when valve plate moves to closed condition shown in Fig. 1-b the time, this butterfly valve is single eccentric type, so crying it is variable eccentric butterfly valve, when valve plate when full-gear becomes the closed condition half-twist, because the effect of the throw of eccentric E of valve rod, valve plate is bordering on translation by rotation, so just makes the distance of valve plate to the conical surface shift-in E of valve seat, make valve plate and sealing surface fit more, also just improved work (sealing) pressure greatly; Change in the full-gear process by closed condition at valve plate, also because the effect of throw of eccentric E is arranged, at first make valve plate leave one of sealing cone apart from E, so just making the opposite side of valve plate unclamp the conical surface earlier in rotary course rotates again, avoided between them in the too big phenomenon of interference amount of compression of rotating the incipient stage, the wearing and tearing that this has just reduced seal valve seat have prolonged life-span of seal valve seat.

Valve seat (2) is to have the sealing surface of taper by making as the rubber nylon elastomeric material.It is assemblied on the valve body (1), even seal valve seat (2) weares and teares, also can be by adjusting the position of valve seat (2), make it and valve plate (3) revert to the mated condition of design, continue use and do not reduce sealability, and do not need whole butterfly valve is scrapped, this has just prolonged the life-span of whole valve more, also very economical.

The startup of valve plate (3) and to close be that to drive eccentric shaft (4) by drive unit (not shown) commonly used be that valve rod is realized.

Embodiment (two)

Referring to Fig. 3,3-a is the valve plate full-gear, 3-b is that valve plate is in closed condition, its structure is identical with embodiment one with working principle, different is to open and close valve plate (3) mode difference, this programme is in a side of valve plate drive link (5) to be installed, and by push-and-pull drive link (5) direct control valve plate, push-and-pull drive link (5) can drive by devices such as piston commonly used.

Claims

1, a kind of variable eccentric butterfly valve comprises valve body [1], valve seat [2], valve plate [3], above-mentioned valve seat has the inner conical sealing surface, valve plate [3] is fixed on the eccentric shaft part of eccentric shaft [4], another axle center of eccentric shaft is for supporting the axle center, eccentric shaft [4] supports the axle center rotation around this, this supports axis deviation valve body center line, and the center line that the invention is characterized in above-mentioned valve plate [3] is by its fixing axle center of shaft part.

2, a kind of variable eccentric butterfly valve according to claim 1 is characterized in that above-mentioned eccentric shaft [4] has a throw of eccentric E, and E will meet D 〉=d+2 E formula.

3, a kind of variable eccentric butterfly valve according to claim 1, it is characterized in that when valve plate [3] when being in closed condition, by its fixedly center line and the valve body central lines of the valve plate in shaft part axle center [3], this moment, this butterfly valve was single eccentric type, when valve plate [3] when being in full-gear, the valve body center line is all departed from two axle center, and this moment, this butterfly valve was two eccentric types.