Whorl of oil oil tube is sealed pre-test

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Summary: Sealed to whorl of oil oil tube mechanism undertook preliminary discuss. Put forward clearly to exist between sealed interface " cricoid pressure contacts an area " of area of new idea and this cricoid pressure contact cannot discontinuity is to assure reliable and sealed requirement. Used the dependability that waits for each link to make sure whorl of oil oil tube is hydraulic and sealed to decide theoretical foundation to be reached from design, treatment. Keyword: Pressure of seal ring shape contacts an area cannot discontinuity snail tooth is out of shape whorl of oil tube of ▲ 　 oil is industry of a kind of oil special whorl, basically use at oil oil tube join and with connective of oil oil tube on all sorts of fittings, it is one kind does not need any sealed filling (the) such as fiber of the silk that be like hemp, yarn, asbestos, balata, need to besmear with appropriate whorl sealed fat can achieve sealed round cone-shaped whorl only. Inside its, outside the centering when whorl is united in wedlock each other, oriented function is good, assemble, disassemble convenient, can bear greater axial power, interchangeability is good, life is long, can repeat for many times use. As a result of above these characteristics, in oil industry, its dosage is very big, use is very extensive, especially its hydraulic and sealed dependability is using the effect with go up to be had more very main. However, to the understanding of the sealed mechanism of this kind of whorl and research, have not discover domestic and internationally at present about more complete discuss. The article tries from production set out actually to undertake to the sealed mechanism of this kind of whorl preliminary discuss. One, sealed mechanism 　 1.

Cone is sealed when one internally, outside when cone cooperates each other, as long as end panel surplus is enough, with respect to usable axial displacement implementation combines what the face is in to be filled with too. The osculatory area that can use the treatment quality that increases combinative scale point, method that increases axial power to increase interface to be in and pressure, obtain more close together cricoid pressure to contact an area thereby. The possibility that contacts area area to form leakage channel greatly more is less also, sealed function is more reliable. And the special cone that whorl of oil oil tube contains whorl groove one kind namely is sealed form -- taper pipe thread is sealed. 2.

When sealed taper pipe thread joins, taper pipe thread wants end panel surplus only (be apart from cheek by jowl) enough, can come back to tighten whorl and produce what axial displacement gets a sealing surface is in easily to tighten force beforehand. Pass the discussion of sealed to cone form, when inside, outside when taper pipe thread cooperates each other, in union face place must form successive, ability of uninterrupted area of cricoid pressure contact keeps sealed. On cone of whorl of oil oil tube, because the existence of snail tooth increased the interface of cone-shaped helicoid to accumulate, caused the labyrinth meandering that makes pressure medium is hard to pass. This are right sealed it is advantageous, but also make all sorts of contact errors on whorl interface increase at the same time, this raised the possibility of leakage again. This asks this kind of taper pipe thread is being designed, when making each geometry element should as far as possible accurate. Bring to bear on in use process screw make when force inside its, outside whorl comes back cheek by jowl the interference with join generation certain, make snail tooth suffers extruding, drawing, bend wait for generation to be out of shape complexly, remedy the flaw between interface, jam the clearance that exists on interface, cut off leakage passageway. Press GB9253.

3, 88 " whorl of oil oil tube " the standard looks from the axial section plane of form of tooth of standard of whorl of oil oil tube (see a picture 1, p is pitch, h is primitive triangle height, hcs ＝ Hcn cuts smooth height for tooth top, hrs ＝ Hrn cuts smooth height for tooth bottom, hs ＝ Hn is) of tooth form height, inside, outside tooth of the snail after whorl closefisted two flank are theoretic answer to be contacted without clearance, and tooth top and tooth background disciplinary action do not have most greatly 0.

076mm(hcs - Hrn ＝ 0.

432 - 0.

356 ＝ 0.

Clearance of 076) crescent form exists. This makes cricoid pressure contacts an area to be in tooth top and tooth bottom place to happen rupture, form top of two edges tooth and tooth bottom corkscrewed yarn the leakage passageway of form. To jam passageway of these two leakage, should continue whorl to screw only (with bore with a reamer machine coming back or other screw mechanical) move to axial 2.

42mm, right now snail tooth just radial shift 0.

076mm. Graph the computation with mobile axial of whorl of form of tooth of standard of whorl of 1 stone vitta (2) seeing a picture is as follows: Graph 2 beg diagram of whorl axial shift by AC ＝ 0.

076(namely clearance) , 1 ° of ∠ ABC ＝ 24 ″ of 47 ′ (taper bevel) , can get BC ＝ 0.

47 ′ of 076/tan1 ° 24 ″ ＝ 2.

42. At this moment snail tooth two flank press press shrinks be out of shape, tooth top is stretchy by extruding, actually differ want axial to move surely 2.

42mm can achieve complete tooth contact, in order to achieve sealed requirement. 2, conclusion is analysed through above, can conclude: Of any forms sealed nothing more than the clearance that the likelihood appears between the interface that is pair of mutual union -- leakage passageway undertakes jamming, the extruding of counteractive pressure medium. And should achieve this one purpose to be about to accomplish reduce the microcosmic, macroscopical error between interface as far as possible, reduce clearance and maintain to tighten force beforehand and form appropriately successive, uninterrupted " cricoid pressure contacts an area " . In the meantime, also must seeing in this cricoid pressure contacts the circumstance inside the area is very complex, the face figure that the press press inside the area engages is " broken up " , it is very irregular. And the power that has all sorts of interplay. But premise must be area of this one contact cannot discontinuous, once discontinuous with respect to meeting leak. And to whorl of oil oil tube of snail tooth be out of shape uninterrupted to preserving osculatory area have very important sense, it can make up for all sorts of errors to make contact an area to increase, and jam leakage passageway. CNC Milling CNC Machining