Annular seal structure for steel lined polyurethane composite pipe

Abstract

The utility model discloses a ring seal structure of steel lining polyurethane composite pipe belongs to polyurethane composite pipe sealing structure technical field, including the annular sealing ring main part and metal support framework of polyurethane material, the annular sealing ring main part is filled with silicon carbide, the annular sealing ring main part outside is adhered with annular fluorine rubber layer through vulcanization process, the annular fluorine rubber layer outside is wrapped with stainless steel foil, the stainless steel foil outside is fixedly installed with the corrugated spring washer, the metal support framework is 316 stainless steel material, the annular groove is seted up on the metal support framework surface, through silicon carbide and stainless steel foil, the wear resistance and high temperature resistance of ring seal structure are strengthened, the annular fluorine rubber layer of vulcanization adhesion outside, improved the oxidation resistance of ring seal structure, thereby improve its service life, the annular groove on the metal support framework surface and the silane coupling agent coating of spraying, the adhesive force with annular sealing ring main part is strengthened significantly, prevents the layered, the degumming phenomenon and appears.

Description

Technical Field

[0001] This utility model relates to an annular sealing structure for steel-lined polyurethane composite pipes, belonging to the technical field of polyurethane composite pipe sealing structures. Background Technology

[0002] Steel-lined polyurethane composite pipe is a composite pipe product with polyurethane as the base material and steel as the inner lining. It is commonly used in chemical, oil, natural gas transportation, and mining industries. The annular sealing structure of the steel-lined polyurethane composite pipe forms a physical barrier in the radial or axial direction by tightly fitting the annular structure with the pipe flange and interface, preventing the fluid inside the pipe from overflowing along the joint. This is a key component that ensures the sealing of the pipe connection and prevents media leakage, ensuring the long-term stable operation of the pipeline system. It is widely used in industrial fluid transportation scenarios.

[0003] The existing steel-lined polyurethane composite pipe annular sealing structure has many shortcomings: traditional polyurethane seals are prone to elastic decay, aging, swelling and other problems in high temperature or highly corrosive media environments, leading to sealing failure; the adhesion between the metal support skeleton and the polyurethane body is insufficient, and delamination and degumming are likely to occur. Utility Model Content

[0004] The purpose of this invention is to provide an annular sealing structure for a steel-lined polyurethane composite pipe to solve the above problems. This structure can improve the high temperature resistance and oxidation resistance of the annular sealing structure, as well as enhance the adhesion between the metal support skeleton and the main body of the annular sealing ring.

[0005] This utility model achieves the above-mentioned objectives through the following technical solution: a ring-shaped sealing structure for a steel-lined polyurethane composite pipe, comprising a ring-shaped sealing ring body made of polyurethane and a metal support skeleton. The metal support skeleton is installed inside the ring-shaped sealing ring body, which is filled with silicon carbide. A ring-shaped fluororubber layer is bonded to the outside of the ring-shaped sealing ring body through a vulcanization process. A stainless steel foil is wrapped around the outside of the ring-shaped fluororubber layer, and a wave spring washer is fixedly installed on the outside of the stainless steel foil. The metal support skeleton is made of 316 stainless steel, and its overall structure is ring-shaped. A ring-shaped groove is formed on the surface of the metal support skeleton. Several ring-shaped grooves are formed during use. The wave spring washer is used to absorb the impact force generated by pressure fluctuations. The stainless steel foil is used to isolate the high-temperature medium from direct contact. The ring-shaped fluororubber layer is used to improve the oxidation resistance.

[0006] Preferably, in order to isolate the stainless steel foil from the external high-temperature medium, the thickness is 0.5 mm.

[0007] Preferably, in order to improve the oxidation resistance of the annular sealing structure, the thickness of the annular fluororubber layer is 2 mm.

[0008] Preferably, in order to absorb the impact force generated by pressure fluctuations, the thickness of the wave spring washer is 1.5mm.

[0009] Preferably, in order to make the metal support skeleton more firmly bonded to the annular sealing ring body, the depth of the annular groove is 2.5mm, and the surface of the metal support skeleton is coated with a silane coupling agent by a spraying process to enhance the adhesion between the metal support skeleton and the annular sealing ring body.

[0010] The beneficial effects of this utility model are as follows: When in use, by filling the inside of the annular sealing ring body with silicon carbide and stainless steel foil, the wear resistance and high temperature resistance of the annular sealing structure are enhanced. The annular fluororubber layer with vulcanization bonding on the outside improves the oxidation resistance of the annular sealing structure, thereby increasing its overall service life. The annular groove on the surface of the metal support skeleton and the sprayed silane coupling agent coating significantly enhance the adhesion to the annular sealing ring body, preventing delamination and degumming. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0012] Figure 2 This is a cross-sectional view of the main body of the annular sealing ring of this utility model.

[0013] Figure 3 This is a schematic diagram of the metal support frame structure of this utility model.

[0014] In the diagram: 1. Annular sealing ring body; 2. Metal support frame; 3. Annular fluororubber layer; 4. Stainless steel foil; 5. Wave spring washer; 6. Annular groove. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figures 1-3As shown, the annular sealing structure of the steel-lined polyurethane composite pipe includes an annular sealing ring body 1 made of polyurethane and a metal support skeleton 2. The metal support skeleton 2 is installed inside the annular sealing ring body 1. The annular sealing ring body 1 is filled with silicon carbide. An annular fluororubber layer 3 is bonded to the outside of the annular sealing ring body 1 through a vulcanization process. A stainless steel foil 4 is wrapped around the outside of the annular fluororubber layer 3. A wave spring washer 5 is fixedly installed on the outside of the stainless steel foil 4. The metal support skeleton 2 is made of 316 stainless steel, and its overall structure is annular. The surface has an annular groove 6. The stainless steel foil 4 is 0.5mm thick, the annular fluororubber layer 3 is 2mm thick, the wave spring washer 5 is 1.5mm thick, and the depth of the annular groove 6 is 2.5mm. The surface of the metal support frame 2 is coated with a silane coupling agent through a spraying process to enhance the adhesion between the metal support frame 2 and the annular sealing ring body 1. During use, the silicon carbide filling amount is 2% of the mass of the annular sealing ring body 1. The silicon carbide filling inside the annular sealing ring body 1 and the outer wrapping of the annular fluororubber layer 3 are not... Stainless steel foil 4 enhances the wear resistance of the annular sealing structure and improves its high-temperature resistance. The annular fluororubber layer 3, with its excellent chemical corrosion resistance and oxidation resistance, significantly improves the annular sealing structure's resistance to strong acids, alkalis, oils, and other media. The silane coupling agent coating sprayed on the surface of the metal support skeleton 2 enhances the adhesion to the annular sealing ring body 1 through chemical bonding, preventing delamination and degumming, and extending the service life of the annular sealing structure. At the same time, the annular groove 6 on the surface of the metal support skeleton 2 enhances the bond with the annular sealing ring body 1 through mechanical interlocking, allowing the polyurethane to be embedded after curing, improving shear resistance, and further enhancing the adhesion to the annular sealing ring body 1. The 316 stainless steel metal support skeleton 2 has good corrosion resistance and mechanical strength. Its annular structure design provides reliable support for the annular sealing ring body 1, preventing excessive deformation under high pressure. The wave spring washer 5 gives the annular sealing structure good compressive strength and vibration resistance. Under high pressure or vibration conditions, the wave spring washer 5 continuously provides stable preload through elastic deformation, preventing loosening of various components.

[0017] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0018] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A ring-shaped sealing structure for a steel-lined polyurethane composite pipe, comprising a polyurethane ring body (1) and a metal support frame (2), wherein the metal support frame (2) is installed inside the ring-shaped sealing body (1), characterized in that: The annular sealing ring body (1) is filled with silicon carbide. An annular fluororubber layer (3) is bonded to the outside of the annular sealing ring body (1) by a vulcanization process. A stainless steel foil (4) is wrapped around the outside of the annular fluororubber layer (3). A wave spring washer (5) is fixedly installed on the outside of the stainless steel foil (4). The metal support frame (2) is made of 316 stainless steel and its overall structure is annular. An annular groove (6) is opened on the surface of the metal support frame (2).

2. The annular sealing structure of the steel-lined polyurethane composite pipe according to claim 1, characterized in that: The stainless steel foil (4) has a thickness of 0.5 mm.

3. The annular sealing structure of the steel-lined polyurethane composite pipe according to claim 1, characterized in that: The thickness of the annular fluororubber layer (3) is 2 mm.

4. The annular sealing structure of the steel-lined polyurethane composite pipe according to claim 1, characterized in that: The thickness of the wave spring washer (5) is 1.5 mm.

5. The annular sealing structure of the steel-lined polyurethane composite pipe according to claim 1, characterized in that: The depth of the annular groove (6) is 2.5 mm. The surface of the metal support frame (2) is coated with a silane coupling agent through a spraying process to enhance the adhesion between the metal support frame (2) and the annular sealing ring body (1).

Images