CN2030270U

CN2030270U - Power-stop sealing

Info

Publication number: CN2030270U
Application number: CN 88205908
Authority: CN
Inventors: 戴小平
Original assignee: Individual
Current assignee: Individual
Priority date: 1988-05-20
Filing date: 1988-05-20
Publication date: 1989-01-04

Abstract

The utility model discloses a pump shaft sealing device, which is successively provided with a pair of impeller devices, a sealing element, a stator ring, and a centrifugal type axial push-and-pull device from inside to outside on the pump shaft. Under the precondition of ensuring the reliable sealing performance, when the pump shaft proceeds high-speed rotation, the junction surface of the friction pair of the sealing element disengages the contact; at the moment of starting up or stopping, when the pump shaft is stationary, the sealing element is in the stationary state of tightly adhering. Accordingly, the service life of the sealing element is enhanced. In addition, the pump shaft sealing device which has reasonable structure is easy to be arranged.

Description

Power-stop sealing

The utility model relates to a kind of seal arrangement, particularly a kind of seal arrangement that is used on the pump shaft.

At present, there is a kind of power one to shut down seal arrangement and applied for utility model patent (application number 87212526, the applying date 871126) by the applicant.Its structure as shown in Figure 1.Its main structure is from the lining sub-propeller device outwards to be installed successively on pump shaft 1, a seal element, a stationary ring, and a centrifugal axial push-and-pull seal arrangement; Wherein the sub-propeller device has the sub-propeller cover 2 that fixedly connected with the pump housing in an inner end, that there is an inner chamber outer end, and one be contained in sub-propeller cover inner chamber, with spool become fixedly connected sub-propeller 3, sub-propeller has uniform long narrow guiding gutter 5 more than two at the bottom of overlapping 2 inner chamber chambeies, on sub-propeller 3 outside end faces uniform plural blade 6 is arranged; Stationary ring 11 be fixed on one with 2 one-tenth fixedly connected sealing covers 9 of sub-propeller cover on; Centrifugal axial push-and-pull seal arrangement contains one and is actively set on the rotating ring 15 that axle is gone up, can be fitted tightly with stationary ring 11, the push-and-pull ring 17 that axle is gone up, can be fitted tightly with rotating ring 15 exterior edge faces 20, inner surface disposes seal element 18 is inserted in activity, and centrifugal mechanism that push-and-pull ring 17 is moved a certain distance vertically, it has spring 22, centrifugal 21, and with the fixing retainer 23 of pump shaft 1; Retainer 23 is shaped on a cylinder with large diameter endoporus section 25 and a small diameter cylinders endoporus section 26 successively from the inner end to the outer end, cylinder with large diameter endoporus 25 is inserted in the outer end of described push-and-pull ring 17 versatilely, the outer surface of retainer 23 uniform more than two with the long narrow groove 29 of inner end sidewall break-through; The outer end of spring 22 is installed at the bottom of the hole of described retainer small diameter cylinders endoporus 26, and the inner end is connected with described push-and-pull ring 17 outer end end faces 27; Plural centrifugal 21 inner end is rotatably mounted to respectively in the long narrow groove 29 of described retainer 23 outer surfaces, is shaped on the flange 33 that embeds described push-and-pull ring 17 cylindrical outer surface annular grooves 19 on each described centrifugal 21 inner end simultaneously.

When pump shaft was in stop state, seal arrangement each element end face on axle fitted tightly to reach the shutdown seal request.But stationary ring, rotating ring end face are fitted and are only depended on an end joined plane that is engaged with each other to realize that this has brought difficulty and problem undoubtedly to aspects such as installation precision, accuracy of manufacturing and sealing effects.When pump shaft is in rotary state, only arrive under the certain high numerical value situation at rotating speed, above-mentioned centrifugal rotation and drive push-and-pull ring and rotating ring are thrown off with stationary ring contact, lean on the rotation of seal element and pump shaft to cause the air shaft of pump chamber external and internal pressure difference formation to seal and reach power (promptly starting shooting) seal request.Can start shooting, shut down moment, because rotating speed does not also satisfy the requirement of described centrifugal mechanism generation effect, centrifugal in the centrifugal mechanism be rotated, and rotating ring, stationary ring just can't be thrown off, so the wearing and tearing of the moment between them are just inevitable.

The utility model has been done improvement to some part and part on the basis of above-mentioned existing seal arrangement.Its objective is for the ease of reaching assembly precision, overcome the moment abrasion between rotating ring, stationary ring, make the more reasonable structure of seal arrangement, sealing effect is better, further improves the life-span of seal element simultaneously.

The purpose of this utility model mainly realizes by the improvement to some part of the rotating ring in the existing seal arrangement, stationary ring, push-and-pull ring and structure.Improvement part is as follows: the outside of rotating ring, inner surface are the cylndrical surface of a band connected in star, and a seal element is arranged in the inner surface annular groove; One elastomer is arranged between the faying surface that stationary ring and rotating ring match; Push-and-pull ring outer surface is for being with an annular groove cylndrical surface, its inner surface from the inner end outward direction have a cylinder with large diameter endoporus section and of being inserted in the rotating ring outer end to embed the small diameter cylinders endoporus section of the last plane bearing outer side surface of axle successively; One fork ring embeds the rotating ring inner annular groove and becomes fixedly connected with push-and-pull ring cylinder with large diameter endoporus.

Owing between rotating ring of the present utility model, stationary ring faying surface one elastomer is arranged, therefore can reduce of the requirement of dynamic and static ring, and improve the sealing between them at aspects such as manufacturing precision and assemblings; On the other hand, after in the push-and-pull ring bearing being set, to being produced, centrifugal mechanism do not do the time spent when the axle rotating speed is also high, dynamic and static ring is each other in contact condition still, rotating shaft becomes the slip idling conditions under the bearing effect, thereby has overcome the moment friction phenomenon of dynamic and static ring in the existing seal arrangement.

With reference to the accompanying drawings the utility model is described specifically.

Fig. 1 is the complete section schematic representation of previous model utility seal arrangement one concrete structure of having applied for;

Fig. 2 is the complete section schematic representation of the utility model seal arrangement first embodiment's concrete structure;

Fig. 3 is the utility model seal arrangement second embodiment's partial sectional view.

Shown in all in part shown in Figure 1 and the identical label unanimity (1～33) of structure among Fig. 2, simultaneously corresponding description with the previous application relative section is omitted, below only improved part among Fig. 2 partly is specifically described.In this seal arrangement, rotating ring 38, the conical surface type ring of stationary ring 36 for matching.Be inserted in stationary ring 36 in the sealing cover 9 by locate on pump shaft 1 with 9 one-tenths fixedly connected compressing tablets 12 of sealing cover, stationary ring 36 has a conical surface 37, and described conical surface 37 is identical mutually with rotating ring 38 inner ends one conical surface that is inserted in spool 1.Rotating ring 38 inner surfaces have an annular groove, and annular groove is embedded in the close element 42(of envelope as sealing density ring, elastic sealed body etc.), rotating ring outer end outer surface also has an annular groove.Sealing effect when shutting down in order to increase end face can be set up an elastomer 34 in stationary ring 36 conical surfaces 37 bottoms.One with the axle 1 one-tenths the flexible connection push-and-pull ring 39 inner ends have the cylinder with large diameter endoporus section that can be inserted in rotating ring 38 described outer ends successively, and the small diameter cylinders endoporus section that embeds a plane bearing 40, fix a fork ring 35 that can embed described rotating ring 38 outer surface annular grooves on the described cylinder with large diameter endoporus section, the cylinder outer surface of push-and-pull ring 39 has the annular groove 19 of a projection 33 embeddings that can make centrifugal 21, and its exterior edge face 27 contacts with spring 22.

Under outage state, by seal element 10,42, elastomer 34 and under the spring force effect, rotating ring 38 fits tightly each other with the conical surface of stationary ring 36, reaches reliable shutdown seal request.

Under open state, after rotating speed reaches certain numerical value, under centrifugal action, rotate for centrifugal 21 and drive push-and-pull ring 39 spacing that moves right, through fork ring 35 rotating ring 38 is side by side moved right, this moment, dynamic and static ring disengaged, the negative pressure that relies on sub-propeller to produce, make the pump inner air and outer air form pressure difference, make former leakage hole become suction port, reach seal request; When rotating speed does not reach certain numerical value (as start, shut down situation such as moment); because centrifugal force is not enough, to be failure to actuate for centrifugal 21, push-and-pull this moment ring 39, bearing 40 can rotate with axle; and dynamic and static ring still keeps sealing the state of rest of applying, thereby reaches the requirement of sealing.

With reference to Fig. 3, this is the utility model seal arrangement second embodiment's partial sectional view.Its composition, effect and working procedure etc. are identical with first embodiment shown in Figure 2 basically.Difference is in parts acting ring 38 ' and stationary ring 36 ' is the plane ring, and they can coincide mutually.Dynamic and static ring also can be other suitable shape with identical end face.Elastomer 34 ' fits tightly at dynamic and static ring and coincide between the end face.Be convenient to the manufacturing of dynamic and static ring so more.

Claims

1, a kind of pump shaft sealing device, it outwards installs a sub-propeller device successively from the lining on pump shaft, one seal element, one stationary ring, and a centrifugal axial push-and-pull device, wherein the sub-propeller device has the sub-propeller cover that fixedly connected with the pump housing in an inner end, there is an inner chamber outer end, one sub-propeller cover inner chamber, with a sub-propeller of fixedlying connected, sub-propeller cover inner chamber has two uniform above guiding gutters at the bottom of the chamber, have on the sub-propeller exterior edge face uniform two with upper blade; Stationary ring be fixed with one with sealing cover that sub-propeller cover is fixedlyed connected on; Centrifugal axial push-and-pull seal arrangement has one to be enclosed within the rotating ring that axle is gone up, can be fitted tightly with stationary ring, one is enclosed within the push-and-pull ring that axle is gone up, engaged with the rotating ring outer end, and centrifugal mechanism that can make the push-and-pull ring move a spacing vertically, it has spring, centrifugal and with the fixing retainer of axle, the outside, the inner surface that it is characterized in that rotating ring are respectively with the cylndrical surface of an annular groove, and a seal element is arranged in the outer annular groove; Stationary ring and the rotating ring conical surface type ring for matching has an elastomer between their faying surface; Push-and-pull ring outer end face is the cylndrical surface with an annular groove, this push-and-pull ring inner surface from the inner end outward direction have a cylinder with large diameter endoporus section and of being inserted in the rotating ring outer end to embed the small diameter cylinders endoporus section of the last plane bearing outer side surface of axle successively; One fork ring embeds the rotating ring inner annular groove and becomes fixedly connected with push-and-pull ring cylinder with large diameter endoporus.

2, pump shaft sealing device as claimed in claim 1 is characterized in that described stationary ring and rotating ring are the plane ring, and they can coincide mutually.

3, pump shaft sealing device as claimed in claim 1 is characterized in that the seal element in the described rotating ring inner surface annular groove is the O RunddichtringO.