CN216555458U

CN216555458U - Sealing assembly for plug valve

Info

Publication number: CN216555458U
Application number: CN202122380034.6U
Authority: CN
Inventors: 冷俊
Original assignee: Shanghai Saitiefu Valve Fluid Technology Co ltd
Current assignee: Shanghai Saitiefu Valve Fluid Technology Co ltd
Priority date: 2021-09-29
Filing date: 2021-09-29
Publication date: 2022-05-17
Anticipated expiration: 2031-09-29

Abstract

The utility model belongs to the technical field of mechanical sealing, and discloses a sealing assembly for a plug valve, which comprises a valve core, a sealing axial gland and a valve core bush, wherein the valve core comprises a valve core shaft and a valve core main body; the sealing axial gland is convenient to use, the valve leakage problem in the high-temperature environment can be well solved by the sealing axial gland, the sealing axial gland is tightly sleeved on the valve core shaft to prevent medium leakage, the auxiliary sealing of the second layer is realized, trace leakage can be effectively prevented, and the sealing effect is achieved by the aid of pressure and medium impulsive force.

Description

Sealing assembly for plug valve

Technical Field

The utility model belongs to the technical field of mechanical sealing, and particularly relates to a sealing assembly for a plug valve.

Background

Need use seal part in the machinery field, seal machinery through seal part, there is certain defect in present technical scheme, and the producer of in-process sealing member is at the durable high temperature resistance of difficult accurate control sealing member of use, easily leads to the leakproofness not enough and leak under the high temperature environment, and simultaneously, the wear-resisting resilience of in-process sealing member of use is not enough.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a sealing component for a plug valve, which aims to solve the problems of insufficient durability and high temperature resistance of a sealing element, easy leakage in a high-temperature environment, insufficient wear-resistant resilience of the sealing element and poor high-temperature resistance and deformation resistance of the sealing element in the background art.

In order to achieve the purpose, the utility model provides the following technical scheme: the utility model provides a seal assembly for plug valve, includes the case, seals axial gland and case bush, the case includes case axle and case main part, seal axial gland closely the cover and press on the case axle, the case bush closely the cover presses on the case main part, simultaneously, the outside of case bush is compressed tightly in the cavity of valve body.

Preferably, the gland includes a gland body, a connecting portion and a projection, the gland body being connected to the projection through the connecting portion.

Preferably, the connecting portion is recessed downwardly relative to an upper surface of the gland body.

Preferably, the protruding part is of a hollow structure, and the caliber of the protruding part is larger than the diameter of the valve plug shaft and smaller than the diameter of the valve plug main body.

Compared with the prior art, the utility model has the beneficial effects that:

(1) the valve core shaft sealing structure is convenient to use through the arranged sealing axial gland, the valve leakage problem in a high-temperature environment can be well solved through the arranged sealing axial gland, the sealing axial gland is tightly sleeved on the valve core shaft to prevent medium leakage, the secondary sealing of the second layer is achieved, trace leakage can be effectively prevented, and the sealing effect is achieved through the pressure and the impulsive force of the medium.

(2) The valve core bushing is convenient to use, has good ductility, the extensibility reaches 20%, has high-temperature resistance and deformation resistance, can stably work in a high-temperature environment of two hundred and thirty degrees, is not easy to soften, has good wear resistance, can keep the smoothness and hardness of a working surface when being rubbed with particle impurities, and has long service life and good acid resistance.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural view of the valve cartridge of the present invention;

FIG. 3 is a schematic structural view of a cartridge bushing of the present invention;

FIG. 4 is a schematic structural view of the sealing axial gland of the present invention;

in the figure: 1. a spool shaft; 2. a valve core main body; 3. a spool bushing; 4. a seal axial gland body; 5. a projection; 6. a connecting portion.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-4, the present invention provides the following technical solutions: the utility model provides a seal assembly for plug valve, includes the case, sealed axial gland and case bush, and the case includes case axle 1 and case main part 2, and sealed axial gland closely overlaps and presses on case axle 1, and the case bush closely overlaps and presses on case main part 2, and simultaneously, the outside of case bush is compressed tightly in the cavity of valve body.

Specifically, the gland includes a gland body 4, a connecting portion 6 and a projection 5, the gland body 4 being connected to the projection 5 through the connecting portion 6.

Specifically, the connecting portion 6 is recessed downward relative to the upper surface of the gland body 4.

Specifically, the protruding portion 5 is a hollow structure, and the caliber of the protruding portion 5 is larger than the diameter of the spool shaft 1 and smaller than the diameter of the spool main body 2. Connecting portion 6 has certain pliability, and in order to be convenient for overlap the axial gland of sealing on the valve core axle, the bore design of the axial gland body 4 of sealing is for being slightly greater than the diameter of valve core axle 1, and the bore design of bulge 5 is the diameter of more than or equal to valve core axle 1 to when overlapping the axial gland of sealing on valve core axle 1, connecting portion 6 can make smooth the passing valve core axle 1 of bulge 5, and make bulge 5 paste tight valve core axle 1, play sealed effect.

In this embodiment, the problem of valve leakage in the solution high temperature environment that the sealed axial gland that sets up can be fine, and the inseparable cover of sealed axial gland is on the case axle to prevent the medium leakage, play the auxiliary seal on second floor, can effectively prevent micro leakage, reach sealed effect with the impulsive force of pressure and medium.

The valve core bush has good ductility, the ductility reaches 20%, and the valve core bush has the ability of high temperature resistance and deformation resistance, can work stably under the high temperature environment of two hundred thirty degrees, is difficult for softening, has again, and wearability is good, when rubbing with particle impurity, can keep the smoothness and the hardness of working face, has again, can its long-lived of using, has fine acid resistance.

The components of the sealing axial gland are polytetrafluoroethylene and carbon fiber, the components of the valve core bushing are polytetrafluoroethylene, carbon fiber and graphite, the content of polytetrafluoroethylene in the sealing axial gland is 95%, the content of carbon fiber in the sealing axial gland is 5%, the content of polytetrafluoroethylene in the valve core bushing is 92%, the content of carbon fiber in the valve core bushing is 6%, and the content of graphite in the valve core bushing is 2%.

The existing similar products have two types of manufacturing modes, the first type is that powdered polytetrafluoroethylene is pressed in a mould, then demoulding is carried out, heating is carried out in a heating furnace to 350 ℃ for heat preservation and cooling, the second type is that a metal ring is placed in the mould after polytetrafluoroethylene is injected, so that the strength of a sealing lining is increased, the first type has the defect that 100% of pure polytetrafluoroethylene is adopted, or 10% of glass fiber is added to polytetrafluoroethylene, or 10% of graphite is added to polytetrafluoroethylene, the mode cannot work safely under the high-temperature and high-pressure industrial acetic acid generation process, the sealing stability cannot be improved, the medium is often leaked from a valve core shaft in the cooling process, and the reason is that the rigidity of the glass fiber is high, the hardness is high, the resilience is poor, and the graphite added in the application can improve the high-temperature resistance.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A seal assembly for a plug valve, comprising: the valve core comprises a valve core shaft (1) and a valve core main body (2), wherein the sealing axial gland is tightly sleeved on the valve core shaft (1), the valve core bushing is tightly sleeved on the valve core main body (2), and meanwhile, the outer part of the valve core bushing is tightly pressed in a cavity of the valve body.

2. A seal assembly for a plug valve according to claim 1, wherein: the sealing axial gland comprises a sealing axial gland body (4), a connecting part (6) and a protruding part (5), wherein the sealing axial gland body (4) is connected with the protruding part (5) through the connecting part (6).

3. A seal assembly for a plug valve according to claim 2, wherein: the connecting portion (6) is recessed downward relative to the upper surface of the gland body (4).

4. A seal assembly for a plug valve according to claim 3, wherein: the protruding portion (5) is of a hollow structure, and the caliber of the protruding portion (5) is larger than the diameter of the valve core shaft (1) and smaller than the diameter of the valve core main body (2).