CN201916243U

CN201916243U - Cantilever pump impeller anti-loosening mechanism with mutually-restricted turn-buckle nuts

Info

Publication number: CN201916243U
Application number: CN2010206474371U
Authority: CN
Inventors: 张影
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-12-08
Filing date: 2010-12-08
Publication date: 2011-08-03
Anticipated expiration: 2020-12-08

Abstract

The utility model relates to a cantilever pump impeller anti-loosening mechanism with mutually-restricted turn-buckle nuts, which is mainly characterized in that auxiliary nuts with opposite turnbuckles are arranged behind fastening nuts of a pump spindle end, and simultaneously the nuts which are in mutually right-handed thread and left-handed thread are connected by using rigid connectors to mutually restrict, so that the nuts can not loosen mutually, thereby achieving the anti-loosening purpose.

Description

The cantilever pump impeller anti-loose mechanism that positive left-hand thread nut conditions each other

Technical field

The utility model relates to the locking gear of mechanical field fastening piece, the cantilever pump impeller anti-loose mechanism that particularly a kind of positive left-hand thread nut conditions each other.

Background technique

Fastening piece locking is the key concerning the safe operation of equipment in mechanical industry, the safety of equipment often relates to people's life safety again, automobile, aloft aircraft in for example advancing, as because of some crucial fastening piece gets loose, consequence can not be imagined.In general, locking the anti-loose of static element that more be difficult to of the fastening piece in running up.Classifying in the mechanical parts as can be known, the locking of nut mainly is divided into detachable and non-dismountable two kinds.Dismountable mainly with spring pad, retaining pad, cotter pin connection, several nuts are connected with steel wire, and increase so-called expansion self-tightening nut of engineering plastics or the like in nut.Non-dismountable formula be organic binder bonding, the welding, the riveted joint or the like.The fastener locking of the occasion of of such little moment can't come into the picture.And some important position just must highly attract much attention.As the impeller anti-loose problem of back with the cantilever pump of elaboration, never basic for these years the solution.The end that the impeller of cantilever pump is installed in main shaft is an end that is suspended on block bearing.Because structure and determined its easy vibrations of environment are cavitated and dielectric corrosion easily, what particularly point out is that its impeller is contained in the narrow pump case runner, and the inflow entrance position of its medium just in time is the residing position of jam nut.Anti-loose structures such as employing retaining pad are possibility hardly, even produce vortex phenomenon in order to reduce the medium inlet, general nut is all made round end stifle nut.Be in use to for these years now, the cantilever pump impeller anti-loose all almost is the fixedly way of single stifle round end nut of sense of rotation opposite threads when adopting with impeller work always.Proof the method can be used but can not be durable in use in real work.Because when the cantilever pump start-stop, may cause counter-rotating because of motor wiring in short-term; Possible termination of pumping moment medium flows backwards and causes the pump counter-rotating; The pressure medium of possible parallel-connected pumps does not sternly cause the pump counter-rotating because of the valve control; The foreign material jam causes nut to get loose or the like in the medium.Cantilever pump is in operation and causes the loosening phenomenon of impeller very general because of nut is loosening in a word.Have the rate of fault of human data representation cantilever pump as follows: mechanical seal fault 45%, the loosening fault that produces of impeller accounts for 30%, and other faults comprise rolling bearing fault and account for 25%.

The impeller of cantilever pump is important part, can normally move in order to guarantee it, and the fastening of the nut behind the impeller is exactly basic assurance.Someone once prevented to the top that impeller was loosening with double nut, did not well imagine owing to have its effect of essential distinction with single nut in essence.The impeller anti-loose of Japanese in the past import cantilever pump is in the sphere centre of stifle nut axle center hole position to be provided with a jackscrew scheming after the stifle nut withstands impeller, with jackscrew again top pump shaft end prevent getting loose of stifle nut in the hope of the frictional force that increases block screw thread and pump shaft screw thread.It is no problem doing when newly the pump of maintenance has just left undoubtedly like this.The thing followed is that jackscrew attenuates soon under medium washes away strongly and corrodes and ruptures.Have to instruments such as hand drills in order to get disconnected jackscrew people so, trouble is many on the contrary.

Summary of the invention

The cantilever pump impeller anti-loose mechanism that provides a kind of positive left-hand thread nut to condition each other is provided the purpose of this utility model.

The utility model specifically is to implement like this: the purpose of structure in order to guarantee to realize that the cantilever pump impeller does not get loose.At first be designed to externally threaded two threaded shaft sections of stepped shaft at the pump shaft end, and the positive each other left-hand thread of screw thread, even large-diameter thread is a left-hand thread, small-diameter thread is right-hand thread; Vice versa.Small-diameter thread and large-diameter thread external diameter differ from a grade, so that guarantee it sufficient intensity are arranged.Perhaps may find sometimes because of the too little situation in position between pump case and pump cover, at this moment, also can be such as shown in Figure 2, get out on the center hole and the large-diameter thread stifle nut of the band spheroidal that shortened with assembling of the internal thread of positive left-hand thread each other at the axle of large-diameter thread, assembling is performed such.The mother nut compress gasket compresses impeller.Secondary nut (being round end stifle nut) puts in aggregates and than in the little thin wall circular of outer six general plans of mother nut with mother nut, tightens secondary nut and pushes down pad and be tight against mother nut; Knock thin wall circular overhanging on the mother nut with hand hammer, make it to fit with outer six sides of secondary nut, outer six sides that tightly encase secondary nut have promptly formed a rigid joint.Total is promptly finished and has been assembled.

Concrete technological scheme is as follows

Technological scheme one

The cantilever pump impeller anti-loose mechanism that a kind of positive left-hand thread nut conditions each other comprises pump shaft, impeller, and big pad and main nut, it is characterized in that: the pump shaft end is designed to externally threaded two threaded shaft sections of stepped shaft, the positive each other left-hand thread of the screw thread of two threaded shaft sections; Main nut is arranged on the major thread shaft part of pump shaft end, and by big pad that impeller is fastening; The outer end of main nut is provided with thin wall circular; On the minor thread shaft part of pump shaft end, be provided with minipad and secondary nut; By secondary nut screw-in and main nut is fastening by minipad; Outer six square ends of secondary nut stretch in the thin wall circular of main nut outer end, and by thin wall circular inclusion tightly, form rigid connection.

Technological scheme two

The cantilever pump impeller anti-loose mechanism that a kind of positive left-hand thread nut conditions each other comprises pump shaft, impeller, and big pad and main nut is characterized in that: the outside thread axle centre drill tapping of pump shaft end and outside thread be the internal thread of positive left-hand thread each other; Main nut is arranged on the outside thread of pump shaft end, and by big pad that impeller is fastening; The outer end of main nut is provided with thin wall circular; Be provided with minipad in thin wall circular, secondary nut screws in pump shaft end center interior threaded hole, and by minipad that main nut is fastening; Outer six square ends of secondary nut stretch in the thin wall circular of main nut outer end, and by thin wall circular inclusion tightly, form rigid connection.

The utility model is owing to adopt positive left-hand thread nut to condition each other, and forms rigid connection by main nut end thin wall circular and secondary nut, thereby anti-loosing effect is good especially.

Description of drawings

Fig. 1 is the schematic representation of internal thread for the utility model two nuts;

Fig. 2 is that the secondary nut of internal thread is externally threaded schematic representation for the utility model master nut.

Among the figure: 1, pump shaft; 2, key; 3, impeller; 4, big pad; 5, main nut; 6, minipad; 7, secondary nut; 8, thin wall circular.

Embodiment

Shown in Fig. 1 assembling,, main nut 5 its screw threads select right-hand thread if being 7 on so secondary nuts of left-hand thread (reality mostly is left-hand thread greatly).Otherwise main nut is a right-hand thread, secondary nut is left-hand thread (more rare), after they are all tightened the top, if because of (promptly getting loose) withdrawed from the attempt of certain reason master nut, but it is whole that it and secondary nut form by thin wall circular six sides wrapping outer with it together, and easing out by the secondary exactly nut of the response after the rigid pipe transmission of main nut will be tightened, and oneself is tight against mother nut one side secondary nut itself, oneself has no room for manoeuvre for it, so this situation can not take place; If it also is impossible that main nut will further push against, except oneself tightens that to prop up the impeller nothing left extraterrestrial in advance, main nut holds out against getting loose of secondary nut just, so if secondary nut will get loose, and the reaction that passes to main nut then is to tighten, this also is impossible.In a word, in case tighten by behind the thin wall circular shroud ring, who thinks is looseningly a bit all restricted and the possibility that becomes by the other side mutually again between them, thereby reaches the purpose that impeller that nut can not pine be tightened also can not get loose.

During the maintenance dismounting, the thin wall circular with main nut prizes the recovery annulus with screw-driver earlier, and secondary nut can rotate therein and can remove.Major and minor nut is tightened the top during assembling, the thin wall circular of main nut is knocked outer six sides of the secondary nut of hard-pressed bale get final product, and dismounting is just so simple in fact.

Claims

1. the cantilever pump impeller anti-loose mechanism that positive left-hand thread nut conditions each other comprises pump shaft, impeller, and big pad and main nut, it is characterized in that: the pump shaft end is designed to externally threaded two threaded shaft sections of stepped shaft, the positive each other left-hand thread of the screw thread of two threaded shaft sections; Main nut is arranged on the major thread shaft part of pump shaft end, and by big pad that impeller is fastening; The outer end of main nut is provided with thin wall circular; On the minor thread shaft part of pump shaft end, be provided with minipad and secondary nut; Secondary nut screws in and is by minipad that main nut is fastening; Outer six square ends of secondary nut stretch in the thin wall circular of main nut outer end, and by thin wall circular inclusion tightly, form rigid connection.

2. the cantilever pump impeller anti-loose mechanism that positive left-hand thread nut conditions each other comprises pump shaft, impeller, and big pad and main nut is characterized in that: the outside thread axle centre drill tapping of pump shaft end and outside thread be the internal thread of positive left-hand thread each other; Main nut is arranged on the outside thread of pump shaft end, and by big pad that impeller is fastening; The outer end of main nut is provided with thin wall circular; Be provided with minipad in thin wall circular, secondary nut screws in pump shaft end center interior threaded hole, and by minipad that main nut is fastening; Outer six square ends of secondary nut stretch in the thin wall circular of main nut outer end, and by thin wall circular inclusion tightly, form rigid connection.