CN2202829Y

CN2202829Y - Jet flow sealing device

Info

Publication number: CN2202829Y
Application number: CN 94229680
Authority: CN
Inventors: 魏仕英
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-10-10
Filing date: 1994-10-10
Publication date: 1995-07-05
Anticipated expiration: 2004-10-10

Abstract

The utility model relates to a novel moving sealing device which is suitable for the seal with media led into rotary shafts. A stationary flow jetting nozzle is arranged at the rotary shaft, and a nozzle opening is fixed on a bearing seat and extends into the hole of the rotary shaft. The flow jetting action is utilized to reduce the flow leakage at sealing clearances to the minimum, and simultaneously three clearance sealing rings and water draining holes are additionally arranged on the inner and the outer circles of the rotary shaft to ensure that when water flows are not smooth and the flow jetting seal fails because of the blockage of the water outlet, favorable seal can still be kept. The utility model has the advantages reliable seal, simple structure, low cost, long service life, and convenient replacement and maintenance. The utility model can also be used for sewage and other corrosive liquids and can be widely used for various hydraulic machines.

Description

Jet flow sealing device

A kind of novel motive sealing, promptly the fluidic seal device is applicable to various hydraulic machines, particularly pressure medium is introduced the occasion in the rotating shaft in hydraulic systems.

Existing liquid motive sealing has contact-type and contactless two big classes, contact-type has stuffing box, felt, leather cup, cushion rubber, piston ring, mechanical seal etc., the above-mentioned poor reliability that is sealed with, the machining accuracy height that has, cost an arm and a leg, what have all has higher requirements to sealed material and fluid cleaning degree.

The purpose of this utility model provides a kind of simple and reliable, and long service life is safeguarded and changed conveniently, and is applicable to the seal arrangement of sewage and other corrosive liquid.

The utility model is to realize like this, in rotating shaft place static jet nozzle is set, it is fixed on the outer static element of rotating shaft, this static element is generally bearing support, the nozzle mouth stretches in the rotary shaft hole, for preventing that hydraulic pressure from crossing low and the water outlet obstruction causes fluidic seal to lose efficacy, establish clearance seal ring and spilled water hole respectively simultaneously at the rotating shaft inside and outside circle.

This real new structure of Fig. 1 is always schemed

Embodiment: press water is introduced the seal arrangement that rotates the intake pipe place by static intake pipe.7(is rotating shaft at the rotation water pipe) end face mouth place installing water nozzle 1, be fixed on the bearing support 3 with stop positioning screwn 11, nozzle mouth 1.1 stretches to and rotates in water pipe 7 holes.Nozzle 1 outer ring and rotate in the water pipe 7 device seal ring 9 between circle, it with the rotation water pipe between for being slidingly matched.Leave the flowing water gap of certain width between nozzle 1 and rotation water pipe 7 both ends of the surface, seal ring 2 places in the bearing support 3, and compressed by nozzle 1 end face, be press fit between seal ring 4 and the bearing support 3, and rotate 7 in water pipe for being slidingly matched, draining one inlet hole 10 is set between bearing support 3 upper sealing rings 2 and 4.After seal ring 4, offer spilled water hole 8.Item 5 is the buffering hydroecium.

With press water by nozzle 1 flow into rotate water pipe 7 after because the ejector action of water jet, a place in gap forms certain negative pressure, causes a place pressure low, vent flow reduces, the pressure reduction before and after the nozzle is big more, ejector action is healed by force.When pressure reduction was zero (being that outlet pipe stops up), the fluidic seal effect was lost efficacy.Therefore, can guarantee that according to the nozzle that flows through the flow parameter design of rotating water pipe 7 leakage rate at gap a, b, c place is very little, even make inlet hole 10 be in suction condition.Thereby reach the purpose of stuffing box bearing 6.Simultaneously, seal ring 2,4,9 is made by wear-resisting corrosion-resistant material, they and rotate the very little gap of 7 maintenances of water pipe with the restriction leakage rate.Add the obstructed situation of current that acts on of dewatering orifice 8,10,, also can prevent the bearing water inlet even water outlet stops up.

The utility model is application success in spray-propelling atomizer (patent ZL901.06170.0).This device once adopted filler, and multiple sealing means such as gap, mechanical liquid hydrostatic bearing and material all can not reach designing requirement, 1400 hours long lives, and adopt the utility model equipment to move 3500 hours continuously, Sealing is intact.The utility model sealing is reliable, simple in structure, cheap, convenient maintenance and replacement, frictional resistance are little, can be widely used in other hydraulic machine.

Claims

1, a kind of medium is introduced the fluidic seal device in the rotating shaft, has the clearance seal ring, it is characterized in that at rotating shaft 7 places static jet nozzle 1 being set, and it is fixed on rotating shaft 7 static element outward, and its nozzle mouth 1.1 stretches in the rotary shaft hole.

2, by the described seal arrangement of claim 1, it is characterized in that static element is a bearing support 3; Between nozzle mouth 1.1 cylindricals and rotating shaft 7 endoporus, establish clearance seal ring 9; 3 of nozzle 1 end face and bearing supports are established clearance seal ring 2; Establish clearance seal ring 4 in rotating shaft 7 and 3 of bearing supports.

By claim 1,2 described seal arrangements, it is characterized in that on bearing support 3 that 3, seal ring 2 and 4 offer radially draining inlet hole 10, after seal ring 4, offer radially spilled water hole 8.