CN213982009U - Shaft sealing device - Google Patents

Abstract

The utility model discloses a shaft seal device, C shape elastomer built-in spring structure spare, axle and body base on set nut, thin wall metal. The utility model discloses a shaft seal device realizes the sealed between the shaft hole under the high temperature high pressure, simultaneously, has solved the last blind mounting of axle downthehole and realize sealed mounting means.

Description

Shaft sealing device

Technical Field

The utility model relates to a pipe-line seal field specifically is a shaft seal device.

Background

The traditional axial seal is generally provided with a groove or a hole on a shaft, and then is arranged on the shaft or the hole by utilizing the larger elastic deformation function of a rubber O-shaped ring to realize sealing. However, the rubber O-shaped rings produced by all rubber manufacturers at home and abroad can not meet the sealing environment with the high temperature of more than 300 ℃, so the sealing structure can not be applied to the high-temperature environment.

Meanwhile, when some valve rod parts of the valve are axially sealed, in order to meet the sealing at high temperature, the sealing structure is designed into a sealing packing structure as shown in fig. 1, the structure generally adopts graphite materials to manufacture sealing packing (the applicable temperature is 600 ℃ at most), but when the structure is installed, a shaft is firstly put into a packing box, the packing box and the shaft form a groove, then the sealing packing is put in, then the packing gland applies axial load to the sealing packing in a bolt pre-tightening mode, and the sealing packing generates radial sealing force under the action of external force, so that the shaft sealing of the valve rod parts is realized. However, the temperature of the structure can only reach below 600 ℃, and due to the limitation of the installation mode, the structure can only be used for installing the shaft firstly, installing the sealing element later and then pre-tightening the bolt, and cannot be applied to the structure for installing the shaft later.

Disclosure of Invention

An object of the utility model is to provide a shaft seal device and application method to the not enough that prior art exists.

In order to achieve the purpose, the utility model adopts the following scheme:

a shaft seal assembly characterized by: the positioning nut is positioned above and positions the C-shaped elastomer built-in spring structural member on the thin-wall metal, and the shaft passes through the positioning nut and is in interference fit with the C-shaped elastomer built-in spring structural member on the thin-wall metal in the groove of the body base;

the C-shaped elastomer built-in spring sealing structural component on the thin-wall metal comprises a built-in spring, a lining elastomer framework and a sealing coating from inside to outside, wherein the lining elastomer framework is C-shaped, and the opening direction of the lining elastomer framework is downward.

Further, the innerspring material can be designed for different temperature and pressure, such as Inconel x750(GH4145), Nimonic 90, and the like.

Further, the lining elastomer framework material can be designed according to different temperature and pressure, such as Inconel718(GH4169), GH4738, GH4099 and the like.

Furthermore, the seal coating can be designed according to different environmental conditions, such as gold plating, silver plating, nickel plating and the like.

Further, the front end of the shaft is designed into a cone mouth form.

Further, the shaft is a cannula.

Furthermore, the lining elastomer framework is prepared by adopting an integral molding technology.

A method of using a shaft seal assembly comprising the steps of:

s1: placing a C-shaped elastomer built-in spring structural member on the thin-wall metal in a groove of a base of the body;

s2: positioning a C-shaped elastomer built-in spring structural member on the thin-wall metal by adopting a positioning nut;

s3: and (3) installing the shaft, and realizing initial sealing through interference fit between the shaft and the C-shaped elastomer built-in spring structural member on the thin-wall metal.

Further, the method also comprises the step of S4: after the internal pressure of the sealing device rises, high-pressure medium enters the C-shaped elastomer built-in spring structural member on the thin-wall metal to form sealing compensation force.

Further, in step S4, the shaft seal portion is subjected to internal pressure, and the portion in contact with the C-shaped elastic body innerspring structure on the thin-walled metal deforms in the radial direction, thereby achieving double self-sealing under high pressure.

In the C-shaped elastomer built-in spring structural part on the thin-wall metal, the thin wall means the wall thickness of 0.1mm-1 mm.

Compared with the prior art, the utility model the advantage lie in: the utility model discloses a shaft seal device realizes the sealed between the shaft hole under high temperature (300 ℃ -1200 ℃) high pressure (0 ~ 200MPa), simultaneously, has solved the last blind mounting of axle downthehole and realize sealed mounting means. The beneficial effects brought by the method are as follows:

1. the C-shaped elastomer built-in spring structural part on the thin-wall metal adopts a lower opening mode, and compared with a C-shaped sealing ring with an opening at the middle side in the prior art, the C-shaped elastomer built-in spring structural part is more suitable for an axial sealing structure, and the built-in spring mechanism can enable the structural part to have higher rebound compensation performance in the radial direction and effectively resist the intermetallic expansion difference caused by temperature.

2. The high-temperature alloy material has temperature resistance, can be adjusted according to different temperature requirements, and can be designed to meet the sealing requirement under the environment of 1000 ℃ or even higher environment.

3. The initial sealing and the perfect self-sealing structure under low stress are combined, during initial sealing, the linear load generated during interference fit is relied on, and when the medium pressure is increased, the sealing compensation force is formed by the medium pressure.

4. In the sealing device, when the pressure of a medium rises, not only the C-shaped elastomer built-in spring structure on the thin-wall metal generates a self-sealing effect, but also the part of the shaft sealing part contacted with the C-shaped elastomer built-in spring structure on the thin-wall metal generates radial deformation due to the action of internal pressure, so that the structure realizes a double self-sealing effect under high pressure.

5. The lining elastomer framework is prepared by adopting an integral forming technology, and compared with a welding forming mode in the prior art, the integrally formed lining elastomer framework has better elasticity, and the provided sealing compensation force is larger and more durable.

6. The application applies the C-shaped elastomer built-in spring structure on the thin-wall metal to the axial sealing structure for the first time to realize the initial sealing of the axial sealing structure and the sealing compensation under the high-pressure state, the axial sealing under the high temperature and the high pressure is usually realized by adopting the packing sealing in the prior art, the working condition that the shaft needs to be assembled after the shaft is not met, even if the O-shaped metal sealing ring is adopted in some axial sealing structures, the sealing assembly can be carried out only by adopting the mode of pre-tightening the shaft and the sealing ring after the assembly, the formation of the initial sealing can only be converted into the radial deformation of the sealing ring to generate the sealing effect by the axial pressure caused by the pre-tightening of the nut, and the radial force can not be provided by the radial deformation generated by the mode of the post-assembly shaft due to the structural characteristics of the O-shaped ring, the elastic deformation of the existing O-shaped ring is limited, and the deformation of the sealing ring is overlarge in the process of the shaft assembly, the resilience force is insufficient, and the initial sealing effect is difficult to ensure. The thin-wall metal upper C-shaped elastomer built-in spring structural part can meet the requirement for post-installation of the shaft, the positioning nut in the application only plays a role in positioning and limiting through pre-tightening, excessive axial pressure is not provided, the thin-wall metal upper C-shaped elastomer built-in spring structural part is guaranteed to still have good resilience, interference fit is generated with the thin-wall metal upper C-shaped elastomer built-in spring structural part when the shaft is installed, and excellent sealing effect can be guaranteed under the condition that the shaft is installed in the post-shaft. In addition, under a high pressure state, the O-shaped sealing ring in the prior art cannot bear enough high pressure under the action of medium pressure, when the pressure is too high, the sealing ring fails because of insufficient compensation force, and when the sealing ring is used for a long time, the part can generate leakage due to loosening of the bolt; and C shape elastomer innerspring structure spare under innerspring's effect on the thin wall metal in this application, when medium pressure is big, the elastic deformation that interference fit formed between innerspring and intubate provides sufficient holding power and prevents the radial shrink of inside lining elastomer skeleton to the effort that makes the high pressure medium exerts on the intubate through inside lining elastomer skeleton, can provide high sealed compensation power, guarantees the sealed effect under the high pressure state.

7. Because the front end of the insertion pipe is designed into a taper opening form, blind installation can be better realized through the guide of the taper opening and the C-shaped elastomer built-in spring structural member on the thin-wall metal when the insertion pipe is inserted finally, and meanwhile, the structure can also be suitable for remote assembly, can be suitable for more use environments, and overcomes the defect that the sealing structure in the prior art is difficult to assemble remotely.

Drawings

FIG. 1 is a schematic structural diagram of a sealing packing structure in the prior art

FIG. 2 is a schematic structural view of the shaft seal structure of the present application

FIG. 3 is a top view of a thin-walled metal C-shaped elastomer innerspring construction

FIG. 4 is a sectional view taken along line A-A of FIG. 3

FIG. 5 is a sectional view taken along line B-B of FIG. 4

FIG. 6 is a partial cross-sectional view of the shaft seal assembly at high pressure

FIG. 7 is a schematic view of a sealing device in the prior art

Reference numerals: 1. the sealing device comprises a valve rod, 2, sealing filler, 3, a filler gland, 4, a bolt, 5, a positioning nut, 6, a thin-wall metal C-shaped elastomer built-in spring structural component, 7, an insertion pipe, 8, a body base, F, a thin-wall metal C-shaped elastomer built-in spring structural component, sealing loads generated by radial deformation of the C-shaped elastomer built-in spring structural component and medium pressure, a part where S and the insertion pipe are in contact with the thin-wall metal C-shaped elastomer built-in spring structural component, F2, an external applied sealing load, a part where S2, an end face is in contact with a C-shaped ring, and L, a high-pressure medium.

Detailed Description

As shown in fig. 2, a shaft sealing device includes a positioning nut 5, a C-shaped elastomer built-in spring structural member 6 on a thin-wall metal, an insertion tube 7 and a body base 8, wherein the C-shaped elastomer built-in spring structural member 6 on the thin-wall metal is located in a groove of the body base 8, the positioning nut 5 is located in the body base 8 and is in threaded connection with the body base 8, the positioning nut 5 is located above and positions the C-shaped elastomer built-in spring structural member 6 on the thin-wall metal, and the insertion tube 7 passes through the positioning nut 5 and is in interference fit with the C-shaped elastomer built-in spring structural member 6 on the thin-wall metal in the groove of the body base 8;

as shown in fig. 3-5, the thin-walled metal upper C-shaped elastomer innerspring sealing structure 6 includes, from inside to outside, an innerspring, a lining elastomer framework, and a sealing plating layer, wherein the lining elastomer framework is C-shaped and has a downward opening. The material of the built-in spring is Inconel x750(GH4145), the material of the lining elastomer framework is Inconel718(GH4169), and the seal plating layer is a silver plating layer. The front end of the cannula 7 is designed to be in the form of a cone. The lining elastomer framework is prepared by adopting an integral molding technology.

A method of using a shaft seal assembly comprising the steps of:

s1: placing the C-shaped elastomer built-in spring structural part 6 on the thin-wall metal in a groove of a body base 8;

s2: positioning a C-shaped elastomer built-in spring structural member 6 on the thin-wall metal by using a positioning nut 5;

s3: and (3) a cannula 7 is arranged, and initial sealing is realized through interference fit between the cannula 7 and the C-shaped elastomer built-in spring structural part 6 on the thin-wall metal.

S4: after the internal pressure of the sealing device rises, a high-pressure medium L enters the C-shaped elastomer built-in spring structural member 6 on the thin-wall metal to form sealing compensation force.

In step S4, the sealed portion of the cannula 7 is subjected to internal pressure, and the portion in contact with the thin-walled metal C-shaped elastomer innerspring structure 6 is deformed radially, thereby achieving double self-sealing under high pressure.

The sealing principle of this application axis sealing device does: when the sealing device is assembled, the positioning nut 5 is only used for pressing the C-shaped elastomer built-in spring structural part 6 on the thin-wall metal into the body base 8 during installation to serve as an assembling and limiting auxiliary part, the sealing is realized by forming initial sealing acting force through interference assembly of the insertion tube 7 and the C-shaped elastomer built-in spring structural part 6 on the thin-wall metal, and sealing compensation force is generated by medium internal pressure after the pressure is increased. As shown in fig. 6, when the pressure of the medium rises, the portion S of the cannula 7 contacting the C-shaped elastomer innerspring structure 6 on the thin-walled metal receives the sealing load F generated by the C-shaped elastomer innerspring structure 6 on the thin-walled metal due to the radial deformation of the structure and the pressure of the medium, thereby achieving the self-sealing effect. In the prior art, a side-opening C-shaped ring is generally applied to the end face seal, the opening of the C-shaped ring is generally opposite to a high-pressure medium L, and the sealing is realized only by the action force generated by the deformation of the C-shaped ring by the pressure of the high-pressure medium L on the C-shaped ring, as shown in fig. 7, the pressure which can be borne by the side-opening C-shaped ring is relatively limited. Or in the shaft sealing structure, the O-shaped sealing ring is usually deformed by pre-tightening the bolt to generate radial deformation to form a sealing effect, when the internal medium pressure is increased, the medium pressure is applied to the outer surface of the O-shaped sealing ring, the radial load is increased by the deformation of the O-shaped sealing ring under the high-pressure medium, the medium pressure which can be borne is limited, and the shaft sealing structure is not suitable for a sealing structure of a post-assembled shaft. The opening of the C-shaped elastomer built-in spring structural part of the thin-wall metal is applied to axial sealing downwards in the application, a high-pressure medium L can enter the C-shaped elastomer built-in spring structural part of the thin-wall metal, the built-in spring can provide initial sealing load and can provide internal support for the lining elastomer framework, the high-pressure medium L is limited by the spring and can apply pressure to the inner surface of the lining elastomer framework, the sealing load is generated by deformation of the C-shaped elastomer built-in spring structural part of the thin-wall metal, the pressure of the high-pressure medium L is directly used as sealing compensation force, and the pressure capable of being borne can be obviously improved.

With the shaft sealing device of the present application, a rear-fit seal of the shaft can be achieved without restricting the seal structure to seal after the shaft is fitted, and final blind fitting of the shaft and remote fitting of the shaft can be achieved.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the description of the present invention, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (7)

1. A shaft seal assembly characterized by: the positioning nut is positioned above and positions the C-shaped elastomer built-in spring structural member on the thin-wall metal, and the shaft passes through the positioning nut and is in interference fit with the C-shaped elastomer built-in spring structural member on the thin-wall metal in the groove of the body base;

the C-shaped elastomer built-in spring sealing structural component on the thin-wall metal comprises a built-in spring, a lining elastomer framework and a sealing coating from inside to outside, wherein the lining elastomer framework is C-shaped, and the opening direction of the lining elastomer framework is downward.

2. The shaft seal arrangement of claim 1 wherein the innerspring material is Inconel x750 or Nimonic 90.

3. The shaft seal of claim 1 wherein the inner lining elastomeric backbone material is GH4169, GH4738 or GH 4099.

4. The shaft seal arrangement of claim 1, wherein the seal plating comprises gold plating, silver plating, nickel plating, or a combination thereof.

5. The shaft seal arrangement of claim 1 wherein the shaft nose is in the form of a countersink.

6. The shaft seal of claim 5 wherein the shaft is a cannula.

7. The shaft seal of claim 1 wherein the inner lining elastomeric skeleton is made using an integral molding technique.

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