The aircraft fuel system oil discharging valve
Technical field
The invention belongs to the aircraft fuel system technical field, relate to a kind of aircraft fuel system oil discharging valve.
Background technique
The aircraft fuel system oil discharging valve is installed on the oil-fired system pipeline, is used for emitting on ground the precipitation or the excess oil of oil-fired system.Awing for preventing valve, open automatically because of reasons such as vibration, overloads, cause fuel oil to reveal, valve should have reliable locking device.
Along with aircraft is more and more higher to the requirement of maintainability, various ground maintenance job requirements are simple to operate, reliable and quick.Traditional aircraft fuel system oil discharging valve adopts mostly between handle and the valve housing and locks by safety fuse cutout, after the ground crew uses oil discharging valve at every turn, all needs lock with safety fuse cutout again.Wherein, when insuring, fuse threading need be crossed the attachment hole on handle and the valve housing, operation easier is big, has increased maintenance workload, has prolonged maintenance period, has caused suitable inconvenience for the real aircraft maintenance work.
Summary of the invention
The objective of the invention is: provide a kind of and can realize aircraft fuel system oil discharging valve convenient, fast, reliable locking.
Technological scheme of the present invention is: a kind of aircraft fuel system oil discharging valve, it comprises handle, spring, position limit socket, housing, spool, external bushing, threaded bushing, guide bush, guide pad, spring retainer, the handle inwall engages with external bushing, position limit socket one end and external bushing end face compress interlock, its the other end is fixed on inner walls, the threaded bushing inwall is threaded with spool, its outer surface between external bushing for being slidingly connected, and retraining it by a position limit pin between threaded bushing and the external bushing radially rotates, spring is arranged between external bushing and the threaded bushing, the one end withstands external bushing, the other end is compressed by the spring retainer that is arranged on the threaded bushing, guide bush is arranged between position limit socket and the spool, and spool is provided with one and is used to retrain it and radially rotates and be arranged on the embedded guide pad of guide bush.
The external bushing end face is provided with latch, and the end face that position limit socket joins with it is provided with and the corresponding draw-in groove of latch.
Be provided with between threaded bushing and the position limit socket inwall and be used to the steel ball that prevents that handle is pulled out.
Guide bush and position limit socket are connected to an integral body, and the two is integrally manufactured.
Be provided with one between spool and the housing and be used to seal spacing block, and spool is by sealing rubber ring and external connector sealing.
The invention has the beneficial effects as follows: aircraft fuel system oil discharging valve of the present invention is by the Unscrew valve of handle, and under the effect of spring force, realize reliable locking to valve, it is simple in structure, easy to operate, the reliability height effectively improves aircraft maintenance efficient, reduce maintenance workload, shorten maintenance period, therefore can alleviate the workload of ground crew when using oil discharging valve greatly, improve the maintainability of oil-fired system.
Description of drawings
Fig. 1 is the outline drawing of aircraft fuel system oil discharging valve of the present invention,
Fig. 2 is the A-A sectional view of Fig. 1,
Fig. 3 is the B-B sectional view of Fig. 1,
Fig. 4 is the C-C sectional view of Fig. 1,
Wherein, 1-handle, 2-spring, 3-position limit socket, 4-housing, 5-spool, 6-external bushing, 7-threaded bushing, 8-guide bush, 9-link stopper, 10-steel ball, 11-guide pad, 12-sealing rubber ring, 13-joint, 14-spring retainer.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail:
See also Fig. 1, its be aircraft fuel system oil discharging valve of the present invention partly cut open figure.In the present embodiment, described aircraft fuel system oil discharging valve comprises housing 4, spool 5, position limit socket 3, spring 2, handle 1, external bushing 6, threaded bushing 7, guide bush 8, link stopper 9, steel ball 10, guide pad 11, sealing rubber ring 12, joint 13, spring retainer 14.
Handle 1 inwall engages with external bushing 6, and position limit socket 3 one ends are provided with draw-in groove, and with the latch interlock of external bushing end face, its other end is fixed on housing 4 inwalls by being threaded.Threaded bushing 7 by thread bush on spool 5, its outer surface between external bushing 6 for being slidingly connected, and retrain it by square end surface between threaded bushing 7 and the external bushing 6 and radially rotate, be provided with between threaded bushing 7 and position limit socket 3 inwalls simultaneously and be used to the steel ball 10 that prevents that handle is pulled out.Spring 2 is arranged between external bushing 6 and the threaded bushing 7, and the one end withstands external bushing 6, and the other end is compressed by the spring retainer 14 that is arranged on the threaded bushing 7, and described spring retainer 14 is a position-limited nail.Guide bush 8 is arranged between position limit socket 3 and the spool 5, is used for the axially directed of spool, and guide bush 8 can connect as one with position limit socket 3, and the two is integrally manufactured.And spool is provided with one and is used to retrain it and radially rotates and be arranged on the embedded guide pad 11 of guide bush 8.Be provided with one between spool 5 and the housing 4 and be used to seal spacing block 9, and spool 5 seals by sealing rubber ring 12 with joint 13.
Aircraft fuel system oil discharging valve of the present invention be not subjected to external force to do the time spent, and valve makes latch on the external bushing 6 and the draw-in groove in the position limit socket 3 lock mutually under spring 2 compression force.When opening valve, at first extract handle 1, latch and position limit socket 3 inner card cages are thrown off, rotatable handle 1 drives threaded bushinges 7 rotations by external bushing 6 again, and threaded bushing 7 is rotated relative to spool 5, makes spool 5 axial retraction, thereby opens valve.When release handle 1, latch under spring 2 effects on the external bushing 6 and the draw-in groove interlock again in the position limit socket 3, the rotation of constraint threaded bushing 7, thus 5 axial motions of restriction spool realize the locking to valve.
In like manner during throttle down, extract handle 1, handle 1 rotates to closed position, and promptly joint 13 compresses spool 5, makes valve closing.Release handle 1 then, under spring 2 compression force, make latch on the external bushing 6 and the draw-in groove interlock in the position limit socket 3, thereby the axial motion of restriction spool realizes the locking of valve.
Aircraft fuel system oil discharging valve of the present invention is by the Unscrew valve of handle, and realization is to the reliable locking of valve under the effect of spring force, and it is simple in structure, easy to operate, the reliability height effectively improves aircraft maintenance efficient, reduce maintenance workload, shorten maintenance period.