CN2050509U

CN2050509U - Mechanical sealing device for rotary reciprocatable shaft

Info

Publication number: CN2050509U
Application number: CN 89204038
Authority: CN
Inventors: 梁军; 姚安佑
Original assignee: Wuhan Polytechnic University
Current assignee: Wuhan Polytechnic University
Priority date: 1989-04-07
Filing date: 1989-04-07
Publication date: 1990-01-03

Abstract

Disclosed is a mechanical sealing device for rotary reciprocatable shaft which is characterized in that a rolling bearing is arranged on a shaft, the inner ring of the bearing forms the movable fit with the shaft, the end surface on one side of the inner ring is used as a mechanical seal moving ring, and the other side is fixed with a sealing ring. The device solves the problem that mechanical seal can not be applied to the situation of reciprocal motion. The device has all the advantages of ordinary mechanical seal. In addition, no fixing elements are arranged on the shaft, so the shaft is more convenient to disassemble than the ordinary mechanical seal. Having broad application, the device can be used in the medium of liquid, gas, particles and the occasion of high pressure, high vacuum, low temperature, easy flammation, easy explosion, poison and corrosiveness.

Description

Mechanical sealing device for rotary reciprocatable shaft

The utility model belongs to the seal arrangement of machinery.

At present along with the developing rapidly of engineering in modern age, the using scope of machinery constantly enlarges, and has promoted the progress of sealing technique greatly.Because mechanical seal has long service life, the distinct advantages of favorable sealing property has obtained development rapidly and application widely in recent years.Mechanical seal (being end face seal), its structural feature are to have the buffering compensation mechanism, by substantially vertical with axle and do two devices that seal face seals in relative rotation.Therefore end face seal is widely used in the motive sealing of running shaft.Because structural limitations such as Fig. 1, still can not be applied at present not only to do to rotate but also reciprocating shaft sealing in.

The purpose of this utility model provides a kind of seal arrangement, make end face seal can be applicable to rotate in the reciprocating axle, and can obtain excellent sealing effect, and the reliable operation life-span is long, and the folding dress is convenient.

The utility model is by a cover face seals, a rolling bearing, and seal ring three parts are formed.The utility model makes face seals under high speed rotating, the sealing under to-and-fro motion of excellent sealing and elastic sealing ring, and fine combination, and bring into play its function separately, realized good comprehensive sealing.

Be described in detail embodiments of the invention below in conjunction with accompanying drawing

The common end face seal structure schematic representation of Fig. 1

Fig. 2 embodiment 1 of the present utility model

1-mechanical seal support wherein, 2-housing, 3-hold-down ring, 4-mechanical seal spring, 5-stationary ring, 6-rotating ring, 7-rolling bearing, 8-elastic seal ring, 9-bearing cap, 10-axle.

Fig. 3 embodiment 2 of the present utility model

1-mechanical seal support wherein, 2-bellows or spring, the 3-stationary ring, the 4-rotating ring, the 5-rolling bearing, the 6-U V-shaped ring, 7-U shape seals three packings, 8-axle, 9-limit lid.

Fig. 4 embodiment 3 of the present utility model

1-mechanical seal support wherein, 2-housing, 3-bellows, 4-pressure ring, 5-stationary ring, 6-rolling bearing, 7-stationary ring, 8-gland, 9-axle, 10-rotating ring, 11-elastic seal ring, 12-rotating ring.

Embodiment 1:

See Fig. 2, on the both ends of the surface of the inner ring that the rotating ring 6 and the seal ring 8 of face seals (being mechanical seal device) is separately fixed at rolling bearing 7, diagrammatic sketch is expressed as high-pressure medium right-hand at axle.When axle is done high speed rotating and straight reciprocating motion,,, leak into the left side of axle through rotating ring 6 and stationary ring 5 so sealing medium just can not pass through ball because Packing spring 4 welds mutually with support 1.Because bearing inner race is movingly with axle, guaranteed the realization of the axially reciprocating of axle, and the leakage in gap is movingly sealed by seal ring 8.Because of the frictional force between axle 5 bearing inner race internal diameters with the frictional force sum of seal ring and between centers end-face friction much larger than end face seal, make the rotating speed of inner ring almost synchronous with axle.Seal ring 8 fixes with inner ring, thereby seal ring 8 only is linear reciprocating motion speed with the speed of related movement of axle, so even under the state of running up, seal ring 8 still can guarantee good sealing effect.

Embodiment 2:

As shown in Figure 3, adopt two rolling bearings, two cover face seals and two seal rings, symmetry is installed on the axle, can realize two way sealed, vacuum seal and back and forth sealing at a high speed.

Embodiment 3:

As Fig. 4,, sealing Figure 11 can be installed in the bearing inner race in order to reduce the axial length of seal arrangement.Also can directly utilize the rotating ring of the end face of bearing inner race, need not among rotating ring 12 and rotating ring 10(Fig. 4 as end face seal) also can realize good sealing.

The utlity model has reliable operation, leakage rate is little, long service life, and the low advantage that waits mechanical seal of friction power loss: and be convenient to the demolition of axle, and need not unload any part of lower sealing device, just axle can be taken out; Working condition is stable; Maintenance cycle is long.

The utility model is applied widely, applicable to liquid, in gas and the granule medium, and high pressure, vacuum, low temperature, high temperature, inflammable, explosive poisonous, occasion that corrosion is arranged, be particularly useful for not allowed lubricant pollution on the axle, and under the higher vacuum condition of axle temperature, axle is made the reciprocating occasion of rotation.

Claims

1, a kind of rotation reciprocating shaft mechanical seal device, it is characterized in that with the both ends of the surface of the inner ring of axle rolling bearing 7 (among Fig. 2) movingly on, rotating ring 6 and the seal ring 8 with mechanical seal fixes respectively.

2,, it is characterized in that one or two rolling bearings of symmetry installation and two cover face seals on axle according to the described seal arrangement of claim 1.

3,, it is characterized in that in bearing 6(Fig. 4 according to the described seal arrangement of claim 1) inner ring on, seal ring 11 is installed, and with the rotating ring of inner ring end face as end face seal.