A kind of test flexible joint
Technical field
The utility model relates to a kind of fuel delivery apparatus test connecting device, is specifically related to a kind of test flexible joint.
Background technique
Fuel nozzle or fuel manifold need to determine the size of flow by test on testing installation, nozzle or fuel manifold to be connected with testing installation during test, at present for the shape of nozzle or fuel manifold joint, the mode that general employing inner conical surface and outer spherical surface coordinate is connected, but because inner conical surface and male cone (strobilus masculinus) are all rigid seal linkage structures, larger torque will be applied when connecting, the small plastic deformation of link is relied on to ensure sealing, and repeatedly to load and unload jointing in experimentation, if misoperation or equipment connection joint existing defects, very easily cause workpiece damage.
Model utility content
The purpose of this utility model is for above-mentioned defect of the prior art, provides the test flexible joint that a kind of screw-down torque is little, can not cause part injury.
To achieve these goals, the technical solution adopted in the utility model is:
Comprise the inner nut and outer nut that cooperatively interact, outer nut offers shoulder hole, connect the aperture of mouth from the inside of outer nut through shoulder hole and be connected with equipment pipeline, the described mouth that connects is step hollow shaft structure, and its afterbody keeps off in the macropore of outer nut shoulder hole; Described inner nut is also arranged in the macropore of outer nut shoulder hole, and the internal thread of inner nut is connected with workpiece screw thread, workpiece by inner nut with connect mouth and engage, inner nut and connect between mouth cushion rubber is set.
Screw thread by cooperatively interacting between described inner nut and outer nut connects.
The described external diameter connecing mouth step macropore 1mm less of the internal thread path of outer nut macropore, the external diameter 1mm less of the hole diameter of outer nut of step aperture.
Described to connect mouth step macropore internal diameter equal with cushion rubber external diameter, the little 0.5mm of depth ratio cushion rubber diameter of section of step macropore.
The outer surface of described outer nut is processed with to be convenient to grip anti-skidding reticulate pattern.
Described inner nut is boss-shaped structure, comprises the thread cylinder stretched in outer nut macropore and the six side's bases kept off in outer nut macropore outside.
The internal thread of described inner nut is arranged with outside thread is concentric.
Compared with prior art, the axis hole that the utility model connects mouth is not less than the oil inlet hole of workpiece, and be connected with equipment pipeline by connecing mouth, then be connected with workpiece screw thread by the internal thread of inner nut, namely workpiece can be engaged with connecing mouth by inner nut.Conveniently, screw-down torque is little, without the need to other instruments during connection for the utility model workpiece and equipment connection, manually tighten and can meet the demands, and due to inner nut and connect between mouth and arrange cushion rubber, can not part injury be caused when tightening, also making joints wear less.
Further, the utility model meets the external diameter 1mm less of the internal thread path of outer nut macropore of mouth step macropore, the external diameter 1mm less of the hole diameter of outer nut of step aperture.Connect mouth step macropore internal diameter equal with cushion rubber external diameter, the little 0.5mm of depth ratio cushion rubber diameter of section of step macropore.The utility model compact structure, be not easy to occur rocking, functional reliability is higher.
Further, outer nut outer surface of the present utility model is processed with and grips anti-skidding reticulate pattern, is convenient to realize manual degree of tightness.
Further, inner nut of the present utility model comprises the thread cylinder stretched in outer nut macropore and the six side's bases kept off in outer nut macropore outside, easily can carry out dismounting by the spanner of correspondence.
Accompanying drawing explanation
Fig. 1 overall structure schematic diagram of the present utility model;
Fig. 2 using state schematic diagram of the present utility model;
In accompanying drawing: 1-inner nut; 2-outer nut; 3-cushion rubber; 4-connects mouth.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
See Fig. 1,2, overall structure of the present utility model comprises inner nut 1, outer nut 2, cushion rubber 3 and connects mouth 4.
1) inner nut 1 comprises thread cylinder and six side's bases, and six side's bases are the screw-thread fit of thin-slab structure, thread cylinder and outer nut 2.There is a through tapped hole at inner nut 1 center, and concentric with outer round thread, this screw thread and workpiece screw-thread fit.
2) outer nut 2 is axle sleeve structure, and center is step hole, and connecing mouth is step hollow shaft structure, connects mouth 4 and passes from hole; The macropore of outer nut 2 is processed with screw thread, and this screw thread coordinates with the outside thread of inner nut 1; Aperture is 0.5mm with connecing the monolateral gap of mouth 4 step aperture, and the Excircle machining of outer nut 2 has online article, is convenient to grip.
3) cushion rubber 3 is GB cushion rubber, according to size and the test demand of workpiece, selects according to NBS.
4) meet the external diameter 1mm less of the internal thread path of outer nut 2 macropore of mouth 4 step macropore, the external diameter 1mm less of the hole diameter of outer nut 2 of step aperture, the aperture of step aperture should be not less than workpiece oil inlet hole aperture; Connect mouth 4 step macropore internal diameter equal with cushion rubber 3 external diameter, the little 0.5mm of depth ratio cushion rubber 3 diameter of section of step macropore.Step aperture is connected with equipment pipeline.
Before the installation of Aviation Fuel nozzle uses, or need after a procedure to check whether it still meets the technical standards, needing to detect to whether use can be continued, by needing the nozzle detected to connect on testing installation, the steps include:
1, flexible joint is assembled.
2, manual rotation outer nut 2, drives inner nut 1 and workpiece threaded engagement, to when cannot tighten, returns 1 ~ 2 circle.
3, workpiece test.
4, after testing, rotate outer nut 2 by hand, drive inner nut 1 and workpiece screw thread to depart from.
Follow-up test workpiece, only need repeat above-mentioned steps 2,3,4.
The utility model has the advantages that: workpiece and equipment connection are convenient, screw-down torque be little, when connecting without the need to instrument, only need manually to tighten, and can not cause part injury, the loss of joints wear is little.