Automatic anti-leakage valve for liquefied natural gas and valve sets
Technical field
The present invention relates to the automatic safety device in a kind of LNG Liquefied natural gas pipeline, refer to a kind of automatic anti-leakage valve for liquefied natural gas and valve sets especially.
Background technique
The anti-leakage valve of existing industrial LNG Liquefied natural gas mostly is shown in Figure 1, it is disclosed patent document number 01215256.0, name is called " a kind of pipeline valve ", it comprises ball valve handle 1 ', valve rod 2 ', ball valve 4 ' and housing 5 ', ball valve 4 ' is arranged in the housing 5 ', be provided with seal ring 7 ' between ball valve 4 ' and the housing 5 ', be provided with in the described housing 5 ' and be interconnected and liquid in-out passage 6 ' point-blank, the pit 3 ' that valve rod 2 ' one end passes housing 5 ' top and ball valve 4 ' upper end fixes together, valve rod 2 ' the other end is connected with handle 1 ', ball valve 4 ' middle part is provided with a through hole 41 ', described through hole 41 ' connects with the liquid in-out passage 6 ' of housing, the valve seat of this ball valve 4 ' is housing a 5 ' intracavity bottom, the shortcoming of this kind LNG Liquefied natural gas anti-leakage valve is: in case seal ring 7 ' lost efficacy, when changing seal ring 7 ', get and earlier the LNG Liquefied natural gas in the liquefied pot is lightered earlier in other liquefied pot, after treating that LNG Liquefied natural gas in this jar empties, housing 5 ' is opened, after taking out ball valve 4 ', cleaning housing 5 ' inner chamber and ball valve 4 ', behind the seal ring 7 ' that more renews, be installed in seal ring 7 ' and ball valve 4 ' in the housing 5 ' in the lump, again with housing 5 ' locking, this replacing process is too complicated, influences working efficiency.
Summary of the invention
The object of the present invention is to provide a kind of automatic anti-leakage valve for liquefied natural gas and valve sets, it is changed the primary seal circle convenience that lost efficacy between valve body and the ball valve and increases work efficiency.
To achieve these goals, technical solution of the present invention is: a kind of automatic anti-leakage valve for liquefied natural gas, comprise housing, ball valve, valve rod and seal ring, be provided with in the described housing and be interconnected and feed pathway on same straight line and liquid outlet channel, described valve rod one end passes housing top and is connected with the groove of ball valve upper end, the other end of wherein said valve rod is equipped with the gear of motor band, be provided with valve body between described ball valve and the housing, the outer surface of described body cavity and ball valve fits, described valve body lower end is extended a valve body live axle, described valve body live axle passes lower housing portion, worm gear by motor-operated worm drive is installed on it, be provided with bearing and seal ring between described housing and the valve body, be provided with bearing and seal ring between described valve body and the valve rod, be provided with the primary seal circle between described ball valve and the valve body, be provided with the sensor that is connected with sensor in the described primary seal circle, described surface of shell offers the repairing window, the feed pathway of described housing, the liquid outlet channel left and right sides is separately installed with suction flange and outlet(discharge) flange.
Automatic anti-leakage valve for liquefied natural gas of the present invention, wherein said valve body is combined by upper valve body and following valve body.
Automatic anti-leakage valve for liquefied natural gas of the present invention, wherein said primary seal circle reaches down between the valve body surface of contact at the through hole outer periphery and the upper valve body at two ends, the ball valve left and right sides.
Automatic anti-leakage valve for liquefied natural gas of the present invention, wherein said valve rod is connected by key with ball valve.
Automatic anti-leakage valve for liquefied natural gas of the present invention, wherein said housing upper and lower end are equipped with the nipple of logical nitrogen.
A kind of automatic anti-leakage valve for liquefied natural gas group, it is formed by two described anti-leakage valve serial connections, wherein the suction flange of the outlet(discharge) flange of first valve and second valve replaces with connecting tube and the outlet of first valve and the import of second valve is linked together, between two anti-leakage valve housings, be provided with Decompression valves, be equipped with the nipple that is connected with the liquid entering hole of Decompression valves on the housing of described two valves, described Decompression valves is fixed on two valves by stiffening rib, described Decompression valves is a ball valve, described Decompression valves liquid outlet is connected with the liquid natural gas jar after by the liquefaction process pipeline, offer ball valve orifice and valve hole on the ball valve of described two valves and the valve body respectively, and ball valve orifice and valve hole connect, the through hole of ball valve orifice and ball valve connects, valve hole communicates with the hole of the nipple of housing, being provided with seal ring, be provided with the sensor that is connected with sensor in the described seal ring in the described pressure release valve housing and between the ball valve with nipple and liquefaction process pipeline connection.
After adopting such scheme, when the primary seal circle of automatic anti-leakage valve for liquefied natural gas of the present invention lost efficacy, owing in the primary seal circle, be provided with the sensor that is connected with external sensor, therefore can by sensor sensing to, valve body at once, being about to valve body revolves along the longitudinal shaft at its centre of sphere place and turn 90 degrees, corresponding the revolving of through hole on the valve body turn 90 degrees at this moment, make the feed pathway on the valve housing be shut by valve body, just can open the repairing window on the surface of shell this moment, the primary seal circle that lost efficacy taken out to change will repair window behind the new primary seal circle again and shut just passablely, whole process is changed the primary seal circle that lost efficacy conveniently and time saving and energy saving, has improved working efficiency.
Description of drawings
Fig. 1 is existing LNG Liquefied natural gas pipeline valve structural representation;
Fig. 2 is the structural representation of automatic anti-leakage valve for liquefied natural gas of the present invention;
Fig. 3 be among Fig. 2 A-A to cross-sectional view;
Fig. 4 is another example structure schematic representation of automatic anti-leakage valve for liquefied natural gas of the present invention;
Fig. 5 be among Fig. 4 B-B to the ball valve cross-sectional view.
Embodiment
See also the structural representation of automatic anti-leakage valve for liquefied natural gas of the present invention shown in Figure 2, this valve 1 comprises housing 11, ball valve 12, valve rod 13, with valve body 14 and the seal ring 15 of ball valve 12 with the centre of sphere, valve body 14 reaches down by upper valve body 141, and valve body 142 combines, the extended valve body live axle 1421 in following valve body 142 bottoms, be provided with in the housing 11 and be interconnected and feed pathway on same straight line 111 and liquid outlet channel 112, seal by upper end cap 113 and lower end cap 114 respectively below reaching above the housing 11, the top of housing 11 and bottom are respectively equipped with the nipple 117 of an inflated with nitrogen, it can make the LNG Liquefied natural gas of passing through carry out cold insulation, reduce LNG Liquefied natural gas liquefaction, feed pathway 111 left sides of housing 11 connect suction flange 18, liquid outlet channel 112 right sides of housing 11 connect outlet(discharge) flange 19, valve rod 13 1 ends pass upper end cap 113 backs and link together with groove 121 clampings of ball valve 12 upper ends and by key, the other end of valve rod 13 is installed a gear 16 by the motor band, the outer surface of valve body 14 inner chambers and ball valve 12 is fitted, after the other end of valve body live axle 1421 passes lower end cap 114, worm gear 17 by motor-operated worm drive is installed on it, is being respectively arranged with primary seal circle 15 on the through hole outer periphery at two ends, ball valve 12 left and right sides and between upper valve body 141 and following valve body 142 surface of contact.In primary seal circle 15, be provided with the sensor that is connected with sensor, in the A-A cross-sectional view as shown in Figure 3, housing 11 surfaces offer repairs window 115, this repairing window is the tee-slot (not shown), be provided with Sealing shield ring 311, seal ring 31 and bearing 21 between valve rod 13 and the upper valve body 141 from top to bottom, be provided with bearing 61 and seal ring 51 between upper valve body 141 and the housing 11 from top to bottom, be provided with bearing 62, seal ring 52 and Sealing shield ring 521 between following valve body 142 and housing 11 and the lower end cap 114 from top to bottom.
Under the valve normal operation, valve rod 13 drives ball valve 12 motions, open and close LNG Liquefied natural gas by housing liquid inlet and outlet passage, and valve body 14 keeps transfixion, when 15 inefficacies of primary seal circle need to change, then valve rod 13 keeps transfixion with ball valve 12, and following valve body 142 drives upper valve body 141 simultaneously and rotates together under valve body live axle 1421 effects of its underpart, close the liquid in-out passage of LNG Liquefied natural gas.When the primary seal circle 15 of valve lost efficacy, owing in primary seal circle 15, be provided with the sensor that is connected with external sensor, therefore can by sensor sensing to, valve body 14 at once, to be valve body 14 with the longitudinal shaft at its centre of sphere place revolve turn 90 degrees, corresponding the revolving of through hole on the valve body 14 turn 90 degrees at this moment, make advancing on the housing 11 of valve 1, liquid outlet channel 111 and 112 is blocked by valve body 14, just can open housing 11 lip-deep repairing windows 115 this moment, the primary seal circle 15 that lost efficacy rotated to repair window 115 places, take out to change and to repair window 115 again behind the new primary seal circle and build just passable.
Another example structure schematic representation of automatic anti-leakage valve for liquefied natural gas of the present invention as shown in Figure 4, this embodiment is serially connected by two valves 1, link together by body 2 between the feed pathway of the liquid outlet channel of first valve 1 and second valve 1, all offer nipple 116 on the housing 11 of two valves 1, two nipples 116 all are connected to the liquid entering hole of a Decompression valves 10, and enter the housing inner chamber of Decompression valves 10 by liquid entering hole, this Decompression valves 10 is an ordinary ball valve, it is fixed on two valves 1 by stiffening rib, it comprises the ball valve 102 in housing 101 and the housing 101, Decompression valves 10 liquid outlets are connected with the liquid natural gas jar after by the liquefaction process pipeline, be provided with seal ring 104 and seal ring 105 with nipple 116 and liquefaction process pipeline connection in the housing 101 and between the ball valve 102, be provided with the sensor that is connected with sensor in seal ring 104 and the seal ring 105, on the ball valve 12 of two valves 1 and valve body 14, offer ball valve orifice 122 and valve hole 1411 respectively, and ball valve orifice 122 connects with valve hole 1411, ball valve orifice 122 connects with the through hole of ball valve 12, and valve hole 1411 communicates with the hole of the nipple 116 of housing 11.Ball valve lead to the hole site on the ball valve 12 can be with reference to figure 4 and shown in Figure 5.
Two valves 1 of present embodiment are under normal operation, the valve rod 13 of two valves all drives ball valve 12 motions separately, opening and closing LNG Liquefied natural gas advances by housing, liquid outlet channel, Decompression valves 10 is in closed condition, LNG Liquefied natural gas is through main passage to following road process pipe, when closing LNG Liquefied natural gas, close two valves 1 earlier, open Decompression valves 10 this moment, entering Decompression valves 10 behind the nipple 116 of LNG Liquefied natural gas in two valve 1 pipelines on ball valve orifice 122 and valve hole 1411 and housing 11 is back in the liquid natural gas jar by the liquefaction process pipeline, after finishing remaining LNG Liquefied natural gas processing, close Decompression valves 10 again.
When present embodiment lost efficacy when the primary seal circle 15 of first valve 1, owing in primary seal circle 15, be provided with the sensor that is connected with external sensor, therefore can by sensor sensing to, close the valve body 14 of first valve at once, to be valve body 14 with the longitudinal shaft at its centre of sphere place revolve turn 90 degrees, corresponding the revolving of through hole on the valve body 14 turn 90 degrees at this moment, make the feed pathway 111 on the housing 11 of this first valve 1 be shut by valve body 14, just can open housing 11 lip-deep repairing windows 115 this moment, the primary seal circle 15 that lost efficacy is rotated to repairing window 115 places, taking-up is changed and will be repaired window 115 again behind the new primary seal circle 15 and build just passable, when if the primary seal circle of second valve 1 15 lost efficacy, owing in primary seal circle 15, be provided with the sensor that is connected with external sensor, therefore can by sensor sensing to, close first valve 1 and second valve 1 at once, the valve body 14 that is about to first valve and second valve all revolves with the longitudinal shaft at centre of sphere place separately and turn 90 degrees, the all corresponding rotation 90 of through hole on the valve body 14 of two valves 1 is at this moment spent, just can open the housing 11 lip-deep repairing windows of second valve 1 this moment, the primary seal circle 15 that lost efficacy is rotated to repairing window place, taking-up is changed and will be repaired window again behind the new primary seal circle and build just passable, it is convenient and time saving and energy saving that whole process is changed seal ring, improved working efficiency.If when the seal ring on the Decompression valves 10 104 and 105 lost efficacy,, so after can closing first valve 1 and second valve 1 immediately, repair or change Decompression valves 10 because its inside is provided with the sensor that is connected with sensor.This structure anti-leakage valve can further prevent the gas leak in the valve, uses more reliable.
Above-described embodiment is described preferred implementation of the present invention; be not that scope of the present invention is limited; design under the prerequisite of spirit not breaking away from the present invention; various distortion and improvement that the common engineers and technicians in related domain make technological scheme of the present invention all should fall in the definite protection domain of claims of the present invention.