RU2004867C1

RU2004867C1 - Sealing unit for sealing rotating shafts of hydraulic machine

Info

Publication number: RU2004867C1
Authority: RU
Inventors: Борис Семенович Захаров
Original assignee: Zakharov Boris S
Priority date: 1990-05-21
Filing date: 1990-05-21
Publication date: 1993-12-15

Description

колебани х вала уплотнительный элемент 7 не снижает своих свойств, а герметизаци обоймы 6 относительно расточки 4 с помощью кольца 18 также не снижает работоспособности уплотнени в целом.the vibrations of the shaft, the sealing element 7 does not reduce its properties, and the sealing of the casing 6 with respect to the bore 4 by means of the ring 18 also does not reduce the operability of the seal as a whole.

..Во врем работы гидромашины за счет трени в уплотнительной паре выдел етс тепло трени и соответственно повышаетс температура манжеты 5. Дл сохранени работоспособности уплотнени необходимо, чтобы обойма выполнена из материала с коэффициентом линейного расширени , равным или большим коэффициента линейного расширени материала, из которого выполнен уплотнительный элемент 7, но при этом обладающий достаточной жесткостью и прочностью дл защиты элемента 7, который выполн етс , как правило, из резины. Такими материалами могут быть, например фторопласт, полиэтилен, поли- пропилен, и т.п. Если же обойма 6 выполнена из стали с низким коэффициентом линейного расширени , то при нагревании зоны трени резина расшир етс и сгорает из-за возникновени чрезмерно высоких контактных нагрузок...During operation of the hydraulic machine due to friction, heat friction is generated in the sealing pair and, accordingly, the temperature of the cuff 5 is increased. To maintain the sealing performance, it is necessary that the cage is made of a material with a linear expansion coefficient equal to or greater than the linear expansion coefficient of the material from which a sealing element 7, but with sufficient rigidity and strength to protect the element 7, which is usually made of rubber. Such materials may be, for example, fluoroplastic, polyethylene, polypropylene, and the like. If, however, the cage 6 is made of steel with a low coefficient of linear expansion, then when the friction zone is heated, the rubber expands and burns due to excessively high contact loads.

При долговременном действии повышенных температур резина стареет и преждевременно тер ет эластичные свойства и уплотнение перестает выполн ть свои функции , С целью снижени температуры элемента 7 опорна втулка 16 с выступами снимает тепло с элемента 7 и передает его смазочно-охлаждающей жидкости, циркулирующей по каналам 8 и полости 10, и в стальной корпус 1,With the long-term effect of elevated temperatures, the rubber ages and prematurely loses its elastic properties and the seal ceases to fulfill its functions. In order to lower the temperature of the element 7, the support sleeve 16 with protrusions removes heat from the element 7 and transfers it to the cutting fluid circulating through channels 8 and cavity 10, and in the steel casing 1,

Дл того, чтобы циркулирующа по каналам 8 и полости 10 смазочно-охлаждаю- ща жидкость не разбрызгивалась в окружающее пространство, в уплотнитель- ном устройстве предусмотрено дополнительное уплотнение в виде плавающего кольца 20, выполненного из неискр щего материала и размещенного в канавке 19. Дл того, чтобы при повышенных радиальных биени х вала не происходил пр мой контакт между корпусом 1 и гильзой 3 зазор между ними выполнен больше зазора между кольцом 20 и дном канавки. При аварийных повышенных радиальных перемещени х вала кольцо 20 заклиниваетс между корпусом 1 и гильзой 3 предотвраща пр мой контакт и возможное искрообразование.In order for the lubricant-cooling fluid circulating through the channels 8 and cavity 10 not to be sprayed into the surrounding space, an additional seal in the form of a floating ring 20 made of non-sparking material and placed in the groove 19 is provided in the sealing device. so that with increased radial runout of the shaft, direct contact between the housing 1 and the sleeve 3 does not occur, the gap between them is larger than the gap between the ring 20 and the bottom of the groove. In case of emergency increased radial movements of the shaft, the ring 20 is jammed between the housing 1 and the sleeve 3 preventing direct contact and possible sparking.

(56) Авторское свидетельство СССР № 1242671, кл. F 16 J 15/32, 1985.(56) Copyright certificate of the USSR No. 1242671, cl. F 16 J 15/32, 1985.

Claims

SUMMARY OF THE INVENTION 1.- SEALING DEVICE OF ROTATING SHAFT OF HYDRAULIC MACHINES, containing a lip seal located in the housing bore, including a sleeve with a self-sealing elastic sealing element installed in it, a channel system in the housing for feeding and annular cavities of the sealing zone fluids, additional sealing of cutting fluid, additional sealing ring, characterized in that, in order to increase the efficiency of the seal during operation and at higher pressure drops, in the elastic sealing element from the high and low pressure sides, hydrodynamic grooves are opened open from the end and cylindrical surfaces, and a support sleeve is installed between the end surface of the bore and the cage from the low pressure side, adjacent to the cage and the elastic sealing element and having end protrusions, matching in shape with and included in the hydrodynamic grooves of the elastic sealing element, with o6quMa setting

Lena in the bore of the housing with the possibility of radial movement and is fixed against rotation, and its end surface from the side of low pressure

sealed relative to the surface of the body bore with an elastic O-ring, with a sleeve fixed to the shaft, covered on the outer surface by an elastic sealing element.

2. The device according to claim 1, characterized in that the clip is made of fluoroplastic

or polyethylene.

3. A device according to claims 1 and 2, characterized in that the support sleeve is made of a material with high thermal conductivity.

4. The device according to claims 1 to 3, characterized in that at least one of the reduced pressure in the housing is made

at least one annular groove in which an additional sealing ring is installed with the possibility of radial movement and sealing of annular cavities with cutting fluid, the radial clearance between the housing and the shaft sleeve being made more than the azor between the outer surface of the barking ring and the bottom of the annular groove.

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