Four eccentric butterfly valve and design method

A design method and four-eccentric technology, applied in the direction of lifting valves, valve devices, mechanical equipment, etc., can solve the problems of large extrusion angle between dynamic and static sealing surfaces, inability to withstand pressure, and inability to seal, so as to achieve good sealing effect and increase flow rate , the effect of reducing the area

Inactive Publication Date: 2012-08-29
SICHUAN SANTAI JIANMEN PUMP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

2) If the operating valve plate continues to move in the closing direction (that is, the valve plate is tightened), the dynamic sealing surface can exert a small pressure on the static sealing surface during this process to generate sufficient sealing specific pressure, otherwise it will not be well sealed
At this time, to solve the interference problem between the dynamic and static sealing surfaces, the only way to increase the parameter θ to an unacceptable level is not only to make the extrusion angle between the dynamic and static sealing surfaces too large, but also to cause the valve plate 1 to be too thin to bear pressure

Method used

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  • Four eccentric butterfly valve and design method
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  • Four eccentric butterfly valve and design method

Examples

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Effect test

Embodiment 1

[0049] Assuming that the diameter of the four-eccentric butterfly valve is D=600, c=50mm and d=90mm are obtained according to the force analysis, and a≈50mm is obtained according to a=(c+d) / 2-c / 3. Take θ=ω=90°, take c / 3≈17mm as the chamfering parameter (that is, the remaining thickness of the valve plate 1 at the chamfering is about 17mm), use computer modeling and find out b through experiments min ≈6mm, using w1+w2-w3 as the objective function, find that when b=8mm, the value of w1+w2-w3 can roughly approach 0, at this time b=0.013D. The design of the valve plate 1 is thus completed. At this time, the fourth eccentric distance e=75.84mm, the third eccentric angle α=6.72°, and the half-cone angle β=16.34° can be obtained as the processing parameters of the valve plate 1 and the valve seat 2. The verification of the interference check in the three-dimensional design software shows that the dynamic and static sealing surfaces of the beveled conical eccentric butterfly valve do...

Embodiment 2

[0051]On the basis of Example 1, keep the values ​​of parameters a, c, d, θ, ω unchanged, but continue to increase the value of parameter b, when b=45mm, the value of the objective function w1+w2-w3 is approximately At the upper limit of the acceptable range, b≈0.08D at this time. In this way, the fourth eccentricity e=131.33 mm, the third eccentricity α=3°, and the half cone angle β=9° can be obtained. The verification of the interference check in the three-dimensional design software shows that the dynamic and static sealing surfaces of the beveled conical eccentric butterfly valve do not interfere at all.

Embodiment 3

[0053] On the basis of Example 1, the values ​​of parameters a, b, c, d, θ, ω are kept constant, and the chamfering parameter is c / 5=10mm (that is, the remaining thickness of the valve plate 1 at the chamfering place is about 10mm) , because the remaining thickness of the valve plate 1 at the chamfer is smaller than that of Example 1, and the dynamic and static sealing surfaces are closer to a "line seal", so the sealing effect is better. The verification of the interference check in the three-dimensional design software shows that the dynamic and static sealing surfaces of the beveled conical eccentric butterfly valve do not interfere at all.

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Abstract

The invention discloses a four eccentric butterfly valve having smaller extrusion angles of movable and fixed sealing surfaces and no interference generation, which meets the following conditions: (1) a is more than or equal to [(c+d) / 2]-c / 3; (2) Theta is more than or equal to 90 degrees and less than or equal to 100 degrees, Omega is more than or equal to 90 degrees and less than or equal to 100degrees, wherein Theta is the angle MNO, and Omega is the angle PQO; (3) an intersection k' of an angular bisector 5 between an extended line of a straight line MN and an extended line of a straight line QP and a Y axis deviates from a perpendicular foot of a perpendicular line drawn from the axis O of a valve plate rotating axle 3 to the Y axle; (4) the whole edges at the top and the bottom of avalve plate 1 are chipped off by chambering, and the residual thickness of the valve plate 1 in a chambering position is c / 5-c / 3; and (5) b is 0.01D-0.08D. The invention also discloses a design method of the four eccentric butterfly valve, in the design process of the method, only one parameter bmin needs to be determined in an experiment, and an optimization target is different from that of the traditional design method so that a sealing surface has most uniform pressure and good sealing effect by utilizing the optimization target.

Description

technical field [0001] The invention relates to a metal hard seal eccentric butterfly valve, in particular to a beveled conical truncated valve plate and a valve seat matched with the valve plate. Background technique [0002] An ideal hard-sealed butterfly valve should meet the following three requirements: 1) During the movement of the valve plate before it is completely closed, no point can be in contact with the static sealing surface of the valve seat, otherwise interference will be formed; The dynamic sealing surface and the static sealing surface of the valve seat must be completely fitted, that is, the dynamic and static sealing surfaces should be the same geometric surface. 2) If the operating valve plate continues to move in the closing direction (that is, the valve plate is tightened), the dynamic sealing surface can exert a small pressure on the static sealing surface during this process to generate sufficient sealing specific pressure, otherwise it will not be w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16K1/226F16K1/36F16K1/42
Inventor 潘世永
Owner SICHUAN SANTAI JIANMEN PUMP
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