Valve operating mechanism

Abstract

The invention relates to a valve operating mechanism, comprising a bracket, a hand wheel, a guide rod and a guide sleeve. The guide sleeve is sleeved in the bracket. The axle center of the guide sleeve is provided with a screw hole, and the upper end of the guide sleeve is also coaxially provided with a counter bore. The outside diameter below the counter bore of the guide sleeve is also provided with an L-shaped guide groove. The bracket is correspondingly provided with a guide pin which is in guide rail match with the L-shaped guide groove. The lateral wall of the counter bore of the guide sleeve is also provided with a through groove in which a position control guide pole is arranged. The inner hole wall of the bracket is also provided with a straight groove with the width matched with the diameter of the guide pole. The straight groove is communicated with the upper end of the bracket. The upper end of the guide rod is linked with the hand wheel, and the lower end of the guide rod is a stepped pole. The small diameter end of the stepped pole is provided with a thread so as to form a guide screw which is matched spirally with the screw hole of the guide sleeve, and the lateral wall of the large diameter end of the stepped pole is provided with a groove the length and width of which are matched with the length and the diameter of a guide ball. In addition, the sum of the depth value of the groove and the wall thickness value of the counter bore of the guide sleeve is equal to or slightly more than the diameter value of the guide pole, and the sum of the depth value of the straight groove and the wall thickness value of the counter bore of the guide sleeve is equal to or slightly more than the diameter value of the guide pole. The operating mechanism has high opening and closing speed and great opening and closing torque.

Description

technical field [0001] The invention relates to a valve, in particular to a valve operating mechanism. Background technique [0002] In some valves, when the valve is opened and closed, the valve core needs to do two actions of translation and rotation, which also makes the valve stem need to do two actions of axial translation and circumferential rotation. Some of the two actions of the rod doing axial translation and circumferential rotation are realized by two sets of operating mechanisms, such as figure 1 In the plug valve shown, the lifting of the valve stem is realized by the hand wheel through the screw and the nut, while the rotation of the valve stem is realized by the handle. This structure is obviously troublesome to operate, and the handle is laborious to operate; It is realized by a set of operating mechanism, such as figure 1 For the ball valve shown, the two actions of the valve stem are realized by the following method: a track groove is set on the valve st...

AI Technical Summary

Problems solved by technology

[0002] In some valves, when the valve is opened and closed, the valve core needs to do two actions of translation and rotation, which also makes the valve stem need to do two actions of axial translation and circumferential rotation. Some of the two actions of the rod doing axial translation and circumferential rotation are realized by two sets of operating mechanisms, such as figure 1 In the plug valve shown, the lifting of the valve stem is realized by the hand wheel through the screw and the nut, while the rotation of the valve stem is realized by the handle. This structure is obviously troublesome to operate, and the handle is laborious to operate; It is realized by a set of operating mechanism, such as figure 1 For the ball valve shown, the two actions of the valve stem are realized by the following method: a track groove is set on the valve stem, usually the track groove is composed of a vertical groove and a helical spiral groove, A guide pin is correspondingly set on the valve cover, and the upper end of the valve stem is set in a screw shape and matched with a nut correspondingly. The nut is driven to rotate by the hand wheel. When the guide pin is in the vertical groove of the track groove, the valve stem will translate in a straight line along the axial direction, so that the wedge surface of the valve stem will push the ball to translate, and when the guide pin is in the spiral groove of the track groove, the valve stem will move along the direction of the spiral groove Action (both circumferential rotation and axial displacement), so as to drive the ball to rotate 90 degrees to achieve the purpose of commutation

The speed of this kind of ball valve is relatively slow when opening and closing, and it needs to rotate many turns of the hand wheel (the number of turns is the axial distance of the track groove divided by the pitch of the screw) to achieve it. The efficiency is very low, and it cannot achieve fast closing and fast closing. The purpose of opening, in addition, when the guide pin is in the spiral groove of the track groove, because there are components of both circumferential rotation and axial displacement, according to the principle of mechanical components, the force required for handwheel rotation is relatively large

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