Steel lining polymer expansion joint negative pressure ring assembly structure

Abstract

The utility model discloses a steel lining macromolecule expansion joint negative pressure ring assembling structure which comprises a corrugated pipe and positioning flanges fixedly connected with the two ends of the corrugated pipe, a polytetrafluoroethylene lining is arranged on the inner wall of the corrugated pipe and attached to the inner surface of the corrugated pipe, a negative pressure extraction supporting structure is arranged in the corrugated pipe, and the inner wall of the corrugated pipe is connected with the positioning flanges. The negative pressure extraction supporting structure is a non-elastic structure, the negative pressure extraction supporting structure is an annular component, the negative pressure extraction supporting structure is in clearance fit with a polytetrafluoroethylene lining in an annular groove of the corrugated pipe, the negative pressure extraction supporting structure and the corrugated pipe form a corrugated pipe compensation structure, and the negative pressure extraction supporting structure is an annular component. The negative pressure extraction supporting structure is composed of a polytetrafluoroethylene pipe and round steel, the polytetrafluoroethylene pipe wraps the outer layer of the round steel, the outer layer of the round steel is sleeved with the polytetrafluoroethylene pipe, the two ends of the polytetrafluoroethylene pipe are welded through polytetrafluoroethylene materials, and the round steel is bent into a ring to be matched with the annular groove of the corrugated pipe.

Description

Technical Field

[0001] The utility model belongs to the technical field of compensators, and in particular relates to a negative pressure ring assembly structure of a steel-lined polymer expansion joint. Background Art

[0002] Existing PTFE-lined bellows expansion joints include a flange, a bellows, and a PTFE lining. The bellows is fixedly connected to the flanges at both ends to form a bellows compensation structure, and the PTFE lining adheres to the inner surface of the bellows. This PTFE-lined bellows expansion joint can not only be used in piping systems to compensate for length, temperature, position, and angle, but also, due to its PTFE lining, it has good corrosion resistance, making it widely applicable in piping systems that transport corrosive media. However, this PTFE-lined bellows expansion joint has certain drawbacks: when used in piping systems with negative pressure, the bellows expansion joint is subject to the force exerted by the repeated contraction and expansion process, which can easily cause the fixed expansion joint's inner wall to be gradually pulled out and deformed by the negative pressure. The medium can severely corrode the PTFE-lined bellows expansion joint, affecting normal use and potentially causing media leakage.

[0003] In view of the above factors, a steel-lined polymer expansion joint negative pressure ring assembly structure is specially designed. The PTFE-lined expansion joint is used on pipelines with highly corrosive media. The function of the negative pressure ring is to prevent the PTFE lining of the compensator bellows from being drawn out and deformed by the negative pressure when the compensator is operating under negative pressure. Utility Model Content

[0004] The purpose of the utility model is to provide a steel-lined polymer expansion joint negative pressure ring assembly structure to solve the problems raised in the above background technology.

[0005] The purpose of the utility model is achieved through the following technical solutions: a steel-lined polymer expansion joint negative pressure ring assembly structure, comprising a bellows and positioning flanges fixedly connected to both ends of the bellows, a polytetrafluoroethylene lining provided on the inner wall of the bellows, and the polytetrafluoroethylene lining being detachably attached to the inner surface of the bellows;

[0006] A negative pressure extraction support structure is provided in the bellows. The negative pressure extraction support structure is a non-elastic structure and is a circular ring-shaped component. The negative pressure extraction support structure and the polytetrafluoroethylene lining in the annular groove of the bellows are gap-matched. The negative pressure extraction support structure and the bellows constitute a bellows compensation structure.

[0007] Furthermore, the negative pressure extraction support structure is a circular ring-shaped component, and the negative pressure extraction support structure is composed of a polyfluoro tube and round steel, and the polyfluoro tube is wrapped around the outer layer of the round steel.

[0008] Furthermore, the PTFE tube is sleeved on the outer layer of the round steel, and both ends are welded with PTFE material, and the round steel is bent into a ring to cooperate with the ring groove of the corrugated tube.

[0009] Furthermore, both ends of the round steel are covered with PTFE tubes and welded to form a ring that matches the bellows.

[0010] Furthermore, the thickness of the polytetrafluoroethylene lining along the inner wall of the corrugated pipe is 0.5-0.8 mm.

[0011] Furthermore, the polytetrafluoroethylene lining is coated on the end surface of the positioning flange along the upper and lower ends of the bellows.

[0012] Furthermore, the outer wall of the corrugated pipe is sprayed with a wear-resistant layer, the thickness of the wear-resistant layer is 0.1-0.5 mm, and the wear-resistant layer is made of anti-corrosion and wear-resistant material.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The utility model is applied to pipelines with highly corrosive media. The negative pressure extraction support structure is composed of a PTFE tube and round steel. The PTFE tube is wrapped around the outer layer of the round steel. When the compensator is in a negative pressure operating state, the PTFE lining of the compensator bellows will not be deformed by the negative pressure extraction. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is an overall schematic diagram of the utility model;

[0016] Figure 2 This is a partial enlarged schematic diagram of the utility model with a polytetrafluoroethylene lining;

[0017] Figure 3 This is a partially enlarged schematic diagram of the wear-resistant layer of the utility model;

[0018] Figure 4 It is a schematic end view of the negative pressure extraction support structure of the utility model. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0020] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0021] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0022] like Figure 1-4 As shown, a steel-lined polymer expansion joint negative pressure ring assembly structure includes a bellows 1 and positioning flanges 2 fixedly connected to both ends of the bellows 1. The inner wall of the bellows 1 is provided with a polytetrafluoroethylene lining 3, and the polytetrafluoroethylene lining 3 is detachably attached to the inner surface of the bellows 1.

[0023] A negative pressure extraction support structure 4 is provided in the bellows 1. The negative pressure extraction support structure 4 is a non-elastic structure and a circular ring-shaped component. The negative pressure extraction support structure 4 is gap-fitted with the polytetrafluoroethylene lining 3 in the annular groove of the bellows 1. The negative pressure extraction support structure 4 and the bellows 1 constitute a bellows compensation structure.

[0024] In order to facilitate the compensator to operate in a negative pressure state during use, the PTFE lining of the compensator bellows will not be deformed by the negative pressure extraction, the negative pressure extraction support structure 4 is a circular ring component, and the negative pressure extraction support structure 4 is composed of a PTFE tube 5 and a round steel 6. The PTFE tube 5 is wrapped around the outer layer of the round steel 6, and the PTFE tube 5 is sleeved on the outer layer of the round steel 6, and the two ends are welded with PTFE material, and the round steel 6 is bent into a ring to cooperate with the ring groove of the bellows 1.

[0025] Both ends of the round steel 6 are covered with the PTFE tube 5 and welded to form a ring that matches the bellows 1 .

[0026] The thickness of the PTFE lining 3 along the inner wall of the corrugated tube 1 is 0.5-0.8 mm.

[0027] In order to facilitate use, the PTFE lining 3 covers the positioning flange 2 to prevent wear at the flange contact position. The PTFE lining 3 covers the end surface of the positioning flange 2 along the upper and lower ends of the bellows 1.

[0028] In order to enhance the scratch resistance and stain resistance of the corrugated pipe 1 during use, the outer wall of the corrugated pipe 1 is sprayed with a wear-resistant layer 7 with a thickness of 0.1-0.5 mm. The wear-resistant layer is made of corrosion-resistant and wear-resistant material.

[0029] This new negative pressure extraction support structure prevents the PTFE lining of the compensator bellows from being deformed by negative pressure extraction when the compensator is operating under negative pressure. The negative pressure ring is constructed by cutting stainless steel round steel and PTFE tubing according to the internal dimensions of the bellows. The round steel is slightly shorter than the PTFE tubing by 10mm. The PTFE tubing is then placed over the outer layer of the round steel and welded together with PTFE material at both ends to ensure that the round steel is completely covered with PTFE. The round steel is then bent into a ring and placed inside the compensator bellows. At the interface, a section of PTFE tubing with a slightly larger diameter is used to wrap both ends of the negative pressure ring and weld them together to ensure seamless gaps and protect the round steel from corrosion by the internal medium during compensator operation.

[0030] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0031] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A steel-lined polymer expansion joint negative pressure ring assembly structure, comprising a bellows (1) and positioning flanges (2) fixedly connected to both ends of the bellows (1), characterized in that: The inner wall of the bellows (1) is provided with a polytetrafluoroethylene lining (3), and the polytetrafluoroethylene lining (3) is attached to the inner surface of the bellows (1) in a detachable manner; A negative pressure extraction support structure (4) is provided in the bellows (1). The negative pressure extraction support structure (4) is a non-elastic structure and is a circular ring-shaped component. The negative pressure extraction support structure (4) is clearance-matched with the polytetrafluoroethylene lining (3) in the annular groove of the bellows (1). The negative pressure extraction support structure (4) and the bellows (1) form a bellows compensation structure. The negative pressure extraction support structure (4) is a circular ring-shaped component, and the negative pressure extraction support structure (4) is composed of a polytetrafluoroethylene tube (5) and a round steel (6), wherein the polytetrafluoroethylene tube (5) is wrapped around the outer layer of the round steel (6); The PTFE tube (5) is sleeved on the outer layer of the round steel (6), and the two ends are welded with PTFE material, and the round steel (6) is bent into a ring to match the ring groove of the bellows (1); The two ends of the round steel (6) are covered with a PTFE tube (5) and welded to form a circular ring that matches the bellows (1); The thickness of the PTFE lining (3) along the inner wall of the bellows (1) is 0.5-0.8 mm; The PTFE lining (3) is wrapped around the end surface of the positioning flange (2) along the upper and lower ends of the bellows (1); The outer wall of the corrugated pipe (1) is sprayed with a wear-resistant layer (7), the thickness of the wear-resistant layer (7) is 0.1-0.5 mm, and the wear-resistant layer is made of an anti-corrosion and wear-resistant material.

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