CN2139646Y

CN2139646Y - Flap valve

Info

Publication number: CN2139646Y
Application number: CN 92221549
Authority: CN
Inventors: 莫元春; 康福仪; 王连科
Original assignee: Shijiazhuang City No3 Valve Factory
Current assignee: Shijiazhuang City No3 Valve Factory
Priority date: 1992-10-31
Filing date: 1992-10-31
Publication date: 1993-08-04
Anticipated expiration: 2002-10-31

Abstract

The utility model relates to a flap valve which is the improvement of the axial movement mechanism of the existing automotive flap valve seat. A positive and an inverse lead screw driving mechanisms are used to connect with the flap valve, each lead screw is connected with a gear ring by a gear which is on the end of the shaft of the lead screw, and a hydraulic cylinder is used to connect with the gear ring and the flap valve seat to make the axial movement of the flap valve seat have favorable synchronism. A fitting which is used to meet an emergency and can be opened and closed by a hand, and the fitting is connected with one positive and one inverse lead screws. The utility model overcomes the defects that the synchronism of the axial movement of the existing motor flap valve seat is worse, etc., and the manufactural manufacturability is also improved.

Description

Flap valve

The utility model relates to a kind of Flap valve, is a kind of valve seat with respect to sealing surface gate valve movably.

Flap valve is a kind of gate valve commonly used on the gas piping, its opening-closing process comprises two actions, one is the axial translation motion of the relative sealing surface of seat valve seat, separate or compress, the upset of another valve plate realizes that the motion of first element mostly is hydraulic mechanism at present greatly, promptly keep the clamped condition of valve plate both sides valve seat with stage clip, with the dedicated hydraulic driving mechanism valve seat selfsealings face is separated, this mechanism is uniform on the valve body excircle, to guarantee the synchronism of motion.But this in actual use synchronism is very unfavorable often, causes valve base sealing plane and valve plate after the separation not parallel, and when valve plate overturns, thereby seal ring may abrade the sealing effect that influences valve or increase maintenance load.

The purpose of this utility model is to disclose can the realize ideal Flap valve of synchronous translational motion of a kind of valve seat, to overcome the above-mentioned deficiency of existing Flap valve.

For realizing that the technological scheme that the utility model task is adopted is that described valve seat axial motion mechanism is by the positive left-hand thread leading screw driving mechanism that connects the valve plate both sides, the synchromesh gear driving mechanism and the driving gear angular displacement driving mechanism that connect each positive left-hand thread leading screw driving mechanism are formed, described positive left-hand thread leading screw driving mechanism is connected with valve plate both sides valve seat respectively with the left-hand thread nut through the right-hand thread nut, the outer end, the same side of each leading screw is provided with driven gear, one rotationally frame be held in gear ring on the valve seat as the engagement of driving gear and described driven gear, oil hydraulic cylinder two ends are hinged with gear ring and valve seat respectively, as the suitable reverse angular displacement driving mechanism of driving gear.As a kind of emergency measure, but this valve also is provided with the driving gear hand-drive mechanism of a clutch, is placed in the other end of a positive left-hand thread leading screw on the valve seat.When power source inefficacy or the damage of hydraulic pressure fork, only need take out the connecting pin of oil hydraulic cylinder one end, make the combination of hand-drive mechanism, still can realize the synchronous translation of valve seat.

The utility model has the advantages that:

When 1, opening and closing, realize axially translation synchronously of valve seat;

2, with the dedicated hydraulic drive system on the alternative former Flap valve of standard hydraulic cylinder;

3, it is very convenient to add the hand-drive emergency device.

Below in conjunction with drawings and Examples the utility model is specified.

Fig. 1 is a Flap valve main structure schematic representation.

Fig. 2 is the A-A sectional view of Fig. 1.

Uniform three positive left-hand thread screw mechanisms 1 on the Flap valve among the figure, the outer end of leading screw 2 is provided with gear 3,4 on a gear ring ring is held on the supporting plate 5, uniform three arc-shaped racks 6 on the gear ring ring 4, constitute gear ring, with 3 engagements of three screw gears, supporting plate 5 is connected with valve seat 7 respectively, plate washer 8 is settled in the outside, and making gear ring ring 4 is that the center is rotated and axial float do not taken place with the axis of valve seat 7.Oil hydraulic cylinder 9 one ends and valve seat 7 are hinged, and the other end and gear ring ring 4 are hinged, and constitute the swing-bar mechanism that drives gear ring.Be connected with valve seat 20,12 through positive and negative button nut 10,11 on each leading screw 2, when leading screw 2 rotations, valve seat 20,12 is done in opposite directions or opposing axial motion.When oil hydraulic cylinder 9 drove 4 angular displacements of gear ring ring, each leading screw 2 was done rotation synchronously, thereby guaranteed the translation of 20,12 pairs of valve plate 13 axial motions of valve seat, during valve plate 13 upsets, and seal ring 19 unlikely being scratched.The oil hydraulic cylinder or the cylinder 14 of drive valve plate 13 upsets are the common mechanism of Flap valve.

Be emergency requirement, the utility model also provides an annex, is located at the other end of a positive and negative button leading screw 2.The output shaft of a handwheel driving worm gear snail thick stick reducing gear 15 is connected with described leading screw 2 through gear coupling 16, and annex casing 17 is connected with valve seat 12 through screw, and guard ring 18 is fixed on the valve seat 12, assist location measure when installing and removing as annex.

In emergent occasion, only need take out the connecting pin of oil hydraulic cylinder one end, and the output shaft of hand-drive mechanism is combined with leading screw 12, this moment, driving force reached two other leading screw through gear ring, but three leading screws are still done synchronous rotation.The emergent means of the hand-drive of valve plate only need be with a manual fork for former valve plate drive cylinder 14, and this is very easy realization, does not do too much narration here.

Claims

1, a kind of Flap valve, mainly comprise valve seat, valve plate, valve seat axial motion mechanism and valve plate switching mechanism, it is characterized in that described valve seat axial motion mechanism is made up of the positive and negative button driving gear angular displacement driving mechanism that connects the both sides valve seat, each positive and negative button silk is connected with two valve seats through positive and negative button nut, and constitute Synchronous Transmission through the driven gear of its axle head and a gear ring, this gear ring frame rotationally is held on the valve body, its two ends of oil hydraulic cylinder are hinged with gear ring and valve seat respectively, as the suitable contrary angular displacement driving mechanism of gear ring.

2, by the described Flap valve of claim 1, but the above valve seat axial motion mechanism of its feature also is provided with the emergent annex of the hand-drive of a clutch, and this annex is placed in a positive and negative the other end of buckleing leading screw, is connected through the positive and negative button leading screw of coupling and this.

3, by claim 1 or 2 described Flap valves, it is characterized in that the gear ring of described valve seat axial motion mechanism is made up of gear ring ring and arc-shaped rack, the gear of positive and negative button leading screw axle head and arc-shaped rack engagement.

4, by the described Flap valve of claim 3, it is characterized in that described gear ring ring stand is held on the supporting plate, this supporting plate and valve seat are connected, and also are provided with the gear ring baffle plate on the supporting plate.