阅读说明：本技术 一种双密封结构 (double-sealing structure ) 是由 聂众一 高宇婷 骆明华 于 2019-11-22 设计创作，主要内容包括：本发明公开了一种双密封结构,包括自密封结构和强制密封结构,自密封结构包括密封座、贯穿件和O型橡胶圈,密封座内设有第一凹槽,O型橡胶圈设于第一凹槽内,贯穿件贯穿密封座并与密封座相互配合,且设于密封座内的O型橡胶圈被贯穿件压缩至变形；强制密封结构包括密封环、金属垫和压紧螺母,密封环一端与贯穿件焊接,金属垫设于密封环与密封座之间,压紧螺母包括密封段和拧紧段,密封段设有内螺纹,密封座外表面设有与内螺纹配合的外螺纹。本发明通过强制密封与自密封的组合方式实现了适用于高温高压容器或大口径管道的螺纹接管的双道密封结构,双道密封结构可以形成两道有效的密封结构,大大提高了密封可靠性。(The invention discloses double-seal structures, which comprise a self-seal structure and a forced seal structure, wherein the self-seal structure comprises a seal seat, a penetrating piece and an O-shaped rubber ring, a groove is arranged in the seal seat, the O-shaped rubber ring is arranged in a groove, the penetrating piece penetrates through the seal seat and is matched with the seal seat, the O-shaped rubber ring arranged in the seal seat is compressed to deform by the penetrating piece, the forced seal structure comprises a seal ring, a metal pad and a gland nut, the end of the seal ring is welded with the penetrating piece, the metal pad is arranged between the seal ring and the seal seat, the gland nut comprises a seal section and a screwing section, the seal section is provided with an internal thread, and the outer surface of the seal seat is provided with an external thread matched with the internal thread.)

The double-seal structure is characterized by comprising a self-seal structure and a forced seal structure, wherein the self-seal structure comprises a seal seat (1), a penetrating piece (2) and an O-shaped rubber ring (3), a th groove is formed in the seal seat (1), the O-shaped rubber ring (3) is arranged in a th groove, the penetrating piece (2) penetrates through the seal seat (1) and is matched with the seal seat (1), and the O-shaped rubber ring (3) arranged in the seal seat (1) is compressed to deform by the penetrating piece (2);

force seal structure including sealing ring (4), metal pad (5) and gland nut (6), sealing ring (4) end with penetration piece (2) welding, metal pad (5) are located sealing ring (4) with between seal receptacle (1), gland nut (6) are including seal segment and screw up the section, the seal segment is equipped with the internal thread, seal receptacle (1) surface be equipped with interior screw-thread fit's external screw thread.

2. double sealing structures, according to claim 1, wherein the two ends of the sealing ring (4) are flat, end of the sealing ring (4) is in contact with the compression nut (6), and the other end of the sealing ring (4) is in contact with the metal gasket (5).

3. double sealing structures according to claim 2, wherein the metal gasket (5) is a metal flat gasket, and the butt end face of the sealing seat (1) and the metal gasket (5) is a plane.

4. double sealing structures according to claim 3, wherein the sealing ring (4) and the end face of the sealing seat (1) contacting with the metal gasket (5) are provided with a plurality of second grooves.

5. The kinds of double sealing structures of claim 4, wherein the second grooves are three, the second grooves are V-shaped grooves, the depth of the V-shaped grooves is 1mm, and the included angle of the V-shaped grooves is 40 °.

6. double sealing structures, according to claim 1, wherein the end of the sealing ring (4) is a flat surface, the other end of the metal ring is a tapered surface, the flat surface end of the sealing ring (4) is in contact with the compression nut (6), and the tapered surface end of the sealing ring (4) is in contact with the metal gasket (5).

7. kinds of double sealing structures, according to claim 6, wherein the metal gasket (5) is a metal lens gasket, and the butt end face of the sealing seat (1) and the metal gasket (5) is a conical surface.

8. The kinds of double sealing structures of claim 7, wherein the metal lens pad is surface silver plated.

9. The kinds of double sealing structures of claim 1, wherein the right angle of the th groove is rounded.

10. The kinds of double-seal structures of claim 1, wherein the O-shaped rubber ring (3) is made of kinds of ethylene propylene rubber, silicone rubber, fluorine rubber or perfluoro rubber.

Technical Field

The invention relates to the technical field of high-temperature and high-pressure sealing, in particular to double-sealing structures.

Background

In the high-temperature high-pressure container of petrochemical industry, thermal power plant, thermal engineering experimental facility and other thermodynamic systems, in order to heat the internal medium of the container, can adopt the inserted electric heating element, the inserted electric heating element is connected with container with the screwed pipe, the sealed mode is the metal pad forced seal, in addition, in order to measure the temperature of the internal medium of high-temperature high-pressure container or heavy-calibre pipeline, adopt the inserted thermometer, the thermometer also adopts the screwed pipe to connect with container or pipeline, the sealed mode is the metal pad forced seal too.

Under the severe working load conditions of long-term high temperature and high pressure, temperature pressure fluctuation or circulation and the like, the single metal pad forced sealing structure is often insufficient in sealing reliability and easy to generate leakage risk, and the safe operation of the system is seriously threatened.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides double-seal structures, the double-seal structure is suitable for a screwed pipe of a high-temperature high-pressure container or a large-caliber pipeline, and the double-seal structure can form two effective seal structures, so that the seal reliability is greatly improved.

kinds of double containment structures, including self-sealing structure and forcing the seal structure, the said self-sealing structure includes seal receptacle, through-going piece and O-type rubber ring, there is grooves in the said seal receptacle, the said O-type rubber ring locates in the said groove, the said through-going piece passes through the said seal receptacle and cooperates with seal receptacle each other, and the O-type rubber ring located in the said seal receptacle is compressed to deform by the through-going piece;

force seal structure including sealing ring, metal pad and gland nut, sealing ring end with the penetration piece welding, the metal pad is located the sealing ring with between the seal receptacle, gland nut includes the seal segment and screws up the section, the seal segment is equipped with the internal thread, the seal receptacle surface be equipped with interior screw-thread fit's external screw thread.

, the two ends of the sealing ring are both flat, the end of the sealing ring is in contact with the compression nut, and the other end of the sealing ring is in contact with the metal pad.

, the metal pad is a metal flat pad, and the butt end face of the sealing seat and the metal pad is a plane.

, a plurality of second grooves are arranged on the end surfaces of the sealing ring and the sealing seat which are contacted with the metal pad.

Step , the second recess is equipped with three, and the second recess is V type groove, the degree of depth in V type groove is 1mm, and the contained angle in V type groove is 40.

, the end of the sealing ring is a plane, the other end of the metal ring is a taper, the plane end of the sealing ring contacts the gland nut, and the taper end of the sealing ring contacts the metal pad.

, the metal pad is a metal lens pad, and the butt end face of the sealing seat and the metal pad is a conical surface.

, silver plating the surface of the metal lens pad.

, the O-shaped rubber ring is made of kinds of ethylene propylene rubber, silicon rubber, fluorine rubber or perfluoro rubber.

The invention has the beneficial effects that:

1) the invention realizes the double-sealing structure of the screwed connection pipe suitable for a high-temperature high-pressure container or a large-caliber pipeline by the combination of forced sealing and self sealing, the double-sealing structure can form two effective sealing structures, the sealing reliability is greatly improved, the self sealing is realized by the size matching between a penetrating piece and an -th groove in a sealing seat and compressing an O-shaped rubber ring arranged in a -th groove to deform, and the forced sealing is realized by applying a pre-tightening load through a compression nut, a sealing ring and the sealing seat, so that the sealing surface between a metal pad and the sealing seat and the sealing surface between the metal pad and the sealing ring are contacted and generate plastic deformation, thereby achieving the effect of forced sealing.

2) The sealing structure has the advantages that the forced sealing applied load of the metal gasket is provided by threaded connection, the pre-tightening load is larger, the initial sealing of the O-shaped rubber gasket is provided by the rectangular groove for installing the O-shaped rubber gasket and the penetrating piece, the final operating load is provided by the medium pressure in the operating state, and therefore the stress and the sealing of the O-shaped rubber gasket and the metal gasket are opposite and mutually independent.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

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

fig. 2 is a schematic structural diagram of embodiment 2 of the present invention.

In the figure, 1-a sealing seat, 2-a penetrating piece, 3-an O-shaped rubber ring, 4-a sealing ring, 5-a metal pad and 6-a compression nut.

Detailed Description

To further clarify the objects, aspects and advantages of embodiments of the present invention, reference will now be made in detail to the present embodiments of the invention as illustrated in the accompanying drawings, which are incorporated in this specification, and it is to be understood that the embodiments illustrated and described are some, but not all, of the embodiments of the invention.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. 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.

It should be noted that like reference numerals and letters refer to like items in the following figures, and thus once a item is defined in figures, it need not be further defined and explained by in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

The terms "," "second," "third," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

For example, "parallel" merely means that the directions are more parallel relative to "vertical," and does not mean that the structure is intended to be perfectly parallel, but may be slightly inclined.

The terms "horizontal," "vertical," "overhang," and the like do not imply that the components are required to be absolutely horizontal, vertical, or overhanging, but rather may be slightly inclined.

For example, "substantially equal" does not merely mean absolute parallelism, and since absolute equality is difficult to achieve during actual manufacturing and operation, generally has a deviation.

In describing the present invention, it should also be noted that unless otherwise expressly stated or limited, the terms "disposed," "mounted," "connected," and "connected" are intended to be , and for example, may be fixedly connected or detachably connected, or may be physically connected, may be directly connected or indirectly connected through an intermediary, and may be internal to two elements.