CN2525320Y

CN2525320Y - Small torque leak tess adjustable ball valve

Info

Publication number: CN2525320Y
Application number: CN 02202648
Authority: CN
Inventors: 杜颐桂
Original assignee: 杜颐桂
Current assignee: Ningbo Zhiqing Industrial Co., Ltd.
Priority date: 2002-02-04
Filing date: 2002-02-04
Publication date: 2002-12-11
Anticipated expiration: 2012-02-04

Abstract

The utility model relates to a small torque leakless adjustable ball valve which improves traditional sealing structure pointing to the defect of a common ball valve. The sealing of one side thereof is changed to a supporting and conducting structure, and the sealing of the other side adopts a new combined sealing surface structure; the sealing effect of the ball valve is enhanced by an adjustable clamping device. When the valve is closed, the sealing surface is tightly clamped with a ball body, and leakage is stopped effectively. When the valve is opened, a sealing lip is loosened from the ball body in time, and the ball body has no relative motion and dynamic friction with the sealing surface; when the valve is opened or closed, the torque is reduced. Compared with the existing ball valve, the utility model has the characteristics of sealing without leakage, small opening and closing force moment, good manufacturability, low cost and long service life.

Description

Little moment of torsion does not have the adjustable ball valve of leakage

Technical field

The little moment of torsion of the present invention does not have the adjustable ball valve of leakage, and affiliated technical field is a universal machine.Ball valve is low because of compact structure, flow resistance, can lead to ball purges, opens and closes and be widely used in industries such as oil, chemical industry, light industry, metallurgy, rock gas rapidly.Developed country all classifies ball valve as development priority in the world at present.Along with China's oil, rock gas industry high speed development, ball valve will obtain extensive use more.Also the sealing effect and the ease for operation of ball valve are had higher requirement simultaneously.

Technical background

Current traditional ball valve exists two big defectives: 1. sealing is poor, particularly low pressure is interior leaks (some product shows the low pressure blow-by), owing to be subjected to the restriction of machining accuracy and assembly precision, then spherome surface and sealing labial surface are difficult to reach desired shapes and best fit state, when ball valve when closing particularly when medium is in low-pressure state, because of gap is in various degree arranged between sealing surface, make sealed cover ratio pressure irregular and specific pressure is too low, and leak in occurring.2. open and close torque is big, and this is caused by multiple factor: 1. make the vertical shaft and the stem shaft decentraction of ball because of processing and assembling factor; 2. the pressure of medium has improved the specific pressure of sphere, and the principle (F=η P) that is directly proportional with pressure according to the friction size has then increased frictional force greatly; 3. increased sealed cover ratio pressure artificially for leakage in reducing.These several combined factors results cause the ball valve open and close torque to increase.

For improving this two kinds of defectives, prevent that ball valve from off position down, producing in the low pressure and leaking, its traditional practice is: 1. as much as possible improve the machining accuracy and the assembly precision of spheroid and sealing lip, the result is that cost increases, and still can't meet the demands at all; 2. strengthen the specific pressure (being the pressure of sealing lip to spheroid) of sealing surface, owing to 1. be difficult to realize then ad infinitum strengthening the specific pressure of sealing surface, its result makes to open and close moment of torsion greatly and even can't open and close, and has lost the basic role of ball valve; 3. can't on ball valve, increase worm gear, endless screw apparatus with the defective that manpower directly opens and closes greatly or increase Electric actuator for overcoming ball valve moment, and other mechanical device.This not only makes the complicated volume of ball-valve structure increase, and has also improved manufacture cost and operating cost.

Even taked above-mentioned measure, but because spheroid and sealing lip are difficult to satisfy the requirement that due precision event still can't reach the ball valve low pressure seal.

In view of the problem that prior art exists, the order of the utility model patent is to provide a kind of little moment of torsion not have the adjustable ball valve of leakage, and this ball valve has realized that really open and close torque is little, sealing does not have leakage.

Summary of the invention

In order to address the above problem sealing configuration and the principle that the present invention has changed ordinary ball valve: 1. to change sealing lip be the rigidity that supporting base (Fig. 1) only improves structure to the valve inlet end, not only blow-by, and leave necessary fluid passage (Fig. 2), play pilot valve and reduced the ball valve open and close torque greatly.2. when the valve export end is provided with the adjustable pressed sealing device (see figure 1) of set of gears one screw thread transmission opening state, this device unclamps, disengaging contacts with sphere, elder generation's spinning ball is closed position when needs are closed, tightening and sealing device again, this device adopts high strength plastic-less deformation's wear-resisting, highly resilient material as sealing material, then stopped the possibility that the sealing surface gap produces after it screws, historical facts or anecdotes has showed the complete leak free while also because cancelled the moment of torsion that the pressure of two sealing lips has reduced keying widely when opening and closing at all.

Advantage and good effect: a) reduced requirement to spheroid machining accuracy and installation precision; B) open and close torque of valve is little, can open fast; C) solved ball valve at all be not closed completely, particularly the difficult problem of low-pressure leak; D) simple, the cost reduction of technology.

Description of drawings

Fig. 1 is that the little moment of torsion of the present invention does not have the structural drawing that leaks adjustable ball valve;

Fig. 2 is the access diagram on the supporting base shown in Figure 1.

Embodiment 1. structures are formed: left valve barrel 1, right valve barrel 2, bottom flange 12, O shape circle (14,15,28) and bonnet 27 are connected with high strength hex head bolt 29 by interior six circumference chapiter screws 13.Spheroid 3 is connected with valve rod 22, handle 23 usefulness screws 45 packing rings 24, bolt 25, and by Lower shaft sleeve 20, Upper shaft sleeve 21, steel ball 17, positioning screwn 18, slotted screw 19, door 16, filler 26, O shape circle (43,44) spheroid 3 is positioned in left valve barrel 1 and the right valve barrel 2.Supporting base 11 is positioned at spheroid 3 front sides.Pressure ring 4, sealing lip 5, seal ring 6, O shape circle (7,8,10) cooperatively interact, and are positioned at spheroid 3 right sides and are connected with gear ring 9 usefulness screw threads 46, and also usefulness stop screw 30 is spacing with small gear 32 outer gearings.Small gear 32 and gear-box 35, gear case gland 31, wheel shaft 33, flat key 34, gear bush 36, sealing gasket 37, O shape circle (38,40) gear-box be logical cover 39, SOC.HD. cap screw 42 assembles, and is fixed on the right valve barrel 2 with SOC.HD. cap screw 41.Principle: 2. the adjustable little moment of torsion of machinery does not have and leaks the ball valve working principle: when ball valve was closed, first rotary ball valve handle 23 made spheroid 3 wind axis perpendicular to path and rotates to and be closed position.Clockwise rotate wheel shaft 33 then, small gear 32 is rotated, gear ring 38 is rotated.Because of gear ring 38 and pressure ring 4 adopts screw threads 46 to be connected and prevents that with stop screw 30 pressure ring 4 from rotating, under gear ring 38 turning efforts, force pressure ring 4 to move to spheroid 3 directions, and promotion (thrust is 50000KN～100000 KN) seal ring 6, O shape circle 8 and sealing lip 5 compress with spheroid 3 along passage axis.Because of spheroid 3 face seals seal by seal ring 6, its sealed width is 1/4 of a conventional seals face width degree, the principle that is inversely proportional to according to area and specific pressure, then sealed cover ratio pressure and conventional seals face specific pressure improve four times, so improved sealing effect, because the highly resilient material that seal ring 6 adopts the high strength plastic-less deformation, has then been stopped the possibility that the sealing surface gap produces as sealing material after it screws at all, historical facts or anecdotes has showed does not have leakage fully again.When ball valve is closed, rotate counterclockwise wheel shaft 33 earlier, small gear 32 is rotated, gear ring 38 is rotated.Under gear ring 38 turning efforts, force pressure ring 4 along passage axis to moving away from spheroid 3 directions, also make simultaneously seal ring 6, sealing lip 5 produce the gap with spheroid 3, at this moment passage 47 and the gap that the produce opposite side that flow into ball valve of medium from the supporting base 11, both sides pressure reduction diminishes (having played the effect of pilot valve) gradually, and at this moment rotary ball valve handle 23 makes spheroid 3 wind axis perpendicular to path to rotate to and be the enable possition.Because when opening and closing, cancelled the ball face sealing specific pressure, there are not relative movement and dyanainic friction between spheroid and the sealing surface, thereby reduced the moment of torsion that ball valve opens and closes widely.

Claims

1. adjustable sealing hold down gag of ball valve, comprise spheroid (3), valve body (1,2), supporting base (11), sealing lip (5), pressure ring (4), gear ring (9), small gear (32) seal ring (6) and O shape circle (8), wherein seal ring (6) is fixed between the sealing surface of sealing lip (5) and spheroid (3), it is characterized in that, bearing ring (11) is positioned at medium inlet and spheroid (3) front side, sealing lip (5) is positioned at spheroid (3) rear side, and place in the pressure ring (4), pressure ring (4) is connected with screw thread (46) with gear ring (9), small gear (32) be installed in that valve body (2) is gone up and with gear ring (9) outer gearing.

2. by the described adjustable sealing hold down gag of claim 1, it is characterized in that on the basis of sealing lip (5) sealing, being provided with seal ring (6), improved specific pressure and sealability on spheroid (3) surface.

3. by the described adjustable sealing hold down gag of claim 1, it is characterized in that being that fluid passage (47) is arranged on the supporting base (11).