PP-R connecting pipe gasket

Abstract

The utility model relates to pipe material technical field especially, more particularly to a kind of PP-R pipe connection gasket for improving the sealing property and service life of connecting pipe fitting and pipe material, including gasket body, the gasket body includes elastic support, rubber seal ring and sealing ring, the elastic support is in wavy structure, the elastic support is metal spring piece, the wave crest height of its wavy structure is 0.5mm~2mm, wave distance is 2mm~5mm, to provide axial elastic compensation amount ≥1mm, the rubber seal ring is located in the upside of elastic support, and the lower surface of rubber seal ring and the upper surface of the wave crest of elastic support are connected, the outer circumferential surface of the rubber seal ring is equipped with first annular groove, the sealing ring is embedded in first annular groove.

Description

Technical Field

[0001] This utility model relates to the field of pipe technology, and in particular to a PP-R pipe gasket. Background Technology

[0002] PP-R pipe, also known as Type III polypropylene pipe, is made from random copolymer polypropylene through extrusion into pipes and injection molding into fittings. It boasts advantages such as energy and material conservation, environmental friendliness, lightweight yet high strength, corrosion resistance, easy maintenance, and long service life, and is currently widely used in construction, municipal engineering, industry, and agriculture. PP-R pipes on the market are available in elbow, tee, and straight fitting forms. During use, they are typically connected to the pipe using heat-fusion socket joints or rubber ring sealing joints, which have the following drawbacks:

[0003] Relying on a single rubber seal or hot melt bonding can easily lead to leakage due to material aging, temperature changes, or installation errors; rubber seals are also prone to cracking under the influence of ultraviolet light, ozone, or chemical media, which can shorten the service life of pipe fittings. Utility Model Content

[0004] Therefore, in view of the above problems, this utility model provides a PP-R pipe gasket that improves the sealing performance and service life of the connection between the pipe fitting and the pipe.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A PP-R connector gasket includes a gasket body, which comprises an elastic support, a rubber sealing ring, and a sealing ring. The elastic support has a corrugated structure and is a metal spring sheet. The peak height of the corrugated structure is 0.5mm to 2mm, and the wave pitch is 2mm to 5mm, so as to provide an axial elastic compensation of ≥1mm. The rubber sealing ring is disposed on the upper side of the elastic support, and the lower surface of the rubber sealing ring is compositely connected with the upper surface of the peak of the elastic support. A first annular groove is provided on the outer circumferential surface of the rubber sealing ring, and the sealing ring is embedded in the first annular groove.

[0007] Furthermore, the crest of the elastic support member is provided with a micro-arc-shaped protrusion, the radius of curvature of which is 0.3mm to 1mm, for forming a surface contact composite structure with the rubber sealing ring.

[0008] Furthermore, the wave-shaped structure of the elastic support is evenly distributed along the circumference, and the number of wave crests is 2 to 8.

[0009] Furthermore, the upper surface of the rubber sealing ring is provided with at least one annular protrusion, the height of which is 0.2mm to 0.8mm, to enhance the sealing contact pressure.

[0010] Furthermore, the inner circumferential surface of the rubber sealing ring is provided with a second annular groove located above the first annular groove, and an annular metal strip is embedded in the second annular groove.

[0011] Furthermore, the cross-section of the first annular groove on the outer circumference of the rubber sealing ring is semi-circular or trapezoidal, forming an interference fit with the sealing ring.

[0012] By adopting the aforementioned technical solution, the beneficial effects of this utility model are as follows: This PP-R pipe gasket, through the combination structure of a corrugated elastic support, a rubber sealing ring, and a sealing ring, overcomes the defects of traditional PP-R pipe connections that rely on a single rubber sealing ring or hot-melt bonding; furthermore, the corrugated structure of the elastic support can provide axial elastic compensation of ≥1mm, which can effectively cope with the displacement between the pipe and the fitting caused by factors such as material aging, temperature changes, or installation errors, reduce stress concentration caused by these factors, reduce the risk of leakage, and thus improve the sealing performance of the connection between the fitting and the pipe; at the same time, the composite connection of the rubber sealing ring and the elastic support, combined with the sealing effect of the sealing ring, further enhances the sealing effect and extends the service life of the fitting compared to the traditional single sealing method. Attached Figure Description

[0013] Figure 1 This is a front view structural diagram of an embodiment of the present utility model;

[0014] Figure 2 This is a cross-sectional structural schematic diagram of an embodiment of the present utility model;

[0015] Figure 3 This is a cross-sectional structural schematic diagram of the elastic support member in an embodiment of this utility model. Detailed Implementation

[0016] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0017] The embodiment of this utility model is as follows:

[0018] refer to Figure 1 , Figure 2 and Figure 3As shown, a PP-R pipe gasket includes a gasket body 1. The gasket body 1 includes an elastic support 11, a rubber sealing ring 12, and a sealing ring 13. The elastic support 11 has a wave-shaped structure and is a metal spring sheet. The height of the wave crest 110 of its wave-shaped structure is 0.5mm to 2mm, and the wave pitch is 2mm to 5mm, preferably 3mm, to provide an axial elastic compensation of ≥1mm, preferably 1.2mm. The rubber sealing ring 12 is disposed on the upper side of the elastic support 11, and the lower surface of the rubber sealing ring 12 is compositely connected with the upper surface of the wave crest 110 of the elastic support 11. A first annular groove 14 is provided on the outer circumferential surface of the rubber sealing ring 12, and the sealing ring 13 is embedded in the first annular groove 14.

[0019] This PP-R pipe gasket overcomes the shortcomings of traditional PP-R pipe connections that rely on a single rubber sealing ring or hot-melt bonding by using a combination structure of a corrugated elastic support 11, a rubber sealing ring 12, and a sealing ring 13. Furthermore, the corrugated structure of the elastic support 11 provides axial elastic compensation of ≥1mm, effectively addressing displacement between the pipe and fitting caused by material aging, temperature changes, or installation errors. This reduces stress concentration caused by these factors, lowers the risk of leakage, and improves the sealing performance of the connection between the fitting and the pipe. Simultaneously, the composite connection of the rubber sealing ring 12 and the elastic support 11, combined with the sealing effect of the sealing ring 13, further enhances the sealing effect and extends the service life of the pipe compared to traditional single-seal methods.

[0020] Furthermore, the top of the crest 110 of the elastic support member 11 is provided with a micro-arc-shaped protrusion 2, the radius of curvature of the micro-arc-shaped protrusion 2 being 0.3mm to 1mm, preferably 0.6mm, for forming a surface contact composite structure with the rubber sealing ring 12. The micro-arc-shaped protrusion 2 on the top of the crest 110 of the elastic support member 11, with a radius of curvature of 0.3mm to 1mm, can form a surface contact composite structure with the rubber sealing ring 12. Compared with the traditional point contact or line contact, this surface contact composite structure increases the contact area, making the support of the elastic support member 11 on the rubber sealing ring 12 more uniform and stable, better transmitting stress, further improving sealing performance, and also helping to extend the service life of the rubber sealing ring 12 and reduce damage to the rubber sealing ring 12 caused by local stress concentration.

[0021] Meanwhile, the wave-shaped structure of the elastic support 11 is evenly distributed along the circumference, and the number of wave crests 110 is 2 to 8, preferably 4, which makes the elastic support 11 more uniformly stressed in the circumference. No matter what direction the pipe and fitting are subjected to force during the connection process, the evenly distributed wave-shaped structure can provide stable and reliable elastic support and compensation, further enhancing the sealing and stability of the connection and effectively preventing leakage problems caused by uneven stress.

[0022] In this embodiment, the upper surface of the rubber sealing ring 12 is provided with at least one annular protrusion 3, preferably two, and the height of the annular protrusion 3 is 0.2mm to 0.8mm, preferably 0.5mm. It is used to enhance the sealing contact pressure. When the PP-R pipe gasket is installed between the pipe and the fitting, the annular protrusion 3 can enhance the sealing contact pressure. During the connection process, the annular protrusion 3 will be compressed, thereby generating greater pressure on the sealing surface, making the seal tighter, effectively preventing fluid leakage, and further improving the sealing performance of the connection. It is especially suitable for occasions with high sealing requirements.

[0023] Furthermore, a second annular groove 4 is provided on the inner circumferential surface of the rubber sealing ring 12 above the first annular groove 14. An annular metal strip 5 is embedded in the second annular groove 4. The presence of a second annular groove 4 on the inner circumferential surface of the rubber sealing ring 12 above the first annular groove 14, and the embedding of an annular metal strip 5 within the second annular groove 4, enhances the overall structural strength of the rubber sealing ring 12. The annular metal strip 5 can restrict the deformation of the rubber sealing ring 12 in the direction of the inner circumferential surface, enabling the rubber sealing ring 12 to maintain good shape stability when subjected to fluid pressure or other external forces in the pipe, preventing sealing failure due to excessive deformation, thereby improving the sealing reliability and service life of the entire PP-R pipe gasket.

[0024] Furthermore, the cross-section of the first annular groove 14 on the outer circumference of the rubber sealing ring 12 is trapezoidal, forming an interference fit with the sealing ring 13. Designing the cross-section of the first annular groove 14 on the outer circumference of the rubber sealing ring 12 as semi-circular or trapezoidal, and forming an interference fit with the sealing ring 13, allows the sealing ring 13 to be better embedded in the first annular groove 14 after installation. The interference fit increases the friction and sealing performance between the sealing ring 13 and the first annular groove 14, preventing the sealing ring 13 from loosening or falling off during use, ensuring that the sealing ring is always in a good sealing state, further improving the sealing performance of the PP-R pipe gasket, and effectively preventing fluid leakage.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0026] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0027] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0028] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A PP-R pipe gasket, characterized in that: The device includes a gasket body, which comprises an elastic support, a rubber sealing ring, and a sealing ring. The elastic support has a wave-shaped structure and is a metal spring sheet. The wave crest height of the wave-shaped structure is 0.5mm to 2mm, and the wave pitch is 2mm to 5mm, so as to provide an axial elastic compensation of ≥1mm. The rubber sealing ring is disposed on the upper side of the elastic support, and the lower surface of the rubber sealing ring is compositely connected with the upper surface of the wave crest of the elastic support. A first annular groove is provided on the outer circumferential surface of the rubber sealing ring, and the sealing ring is embedded in the first annular groove.

2. The PP-R pipe gasket according to claim 1, characterized in that: The elastic support member has a micro-arc-shaped protrusion at the crest, and the radius of curvature of the micro-arc-shaped protrusion is 0.3mm to 1mm, which is used to form a surface contact composite structure with the rubber sealing ring.

3. The PP-R pipe gasket according to claim 2, characterized in that: The wave-shaped structure of the elastic support is evenly distributed along the circumference, and the number of wave crests is 2 to 8.

4. The PP-R pipe gasket according to any one of claims 1 to 3, characterized in that: The upper surface of the rubber sealing ring is provided with at least one annular protrusion, the height of which is 0.2mm to 0.8mm, to enhance the sealing contact pressure.

5. The PP-R pipe gasket according to claim 4, characterized in that: The inner circumferential surface of the rubber sealing ring and located above the first annular groove is provided with a second annular groove, and an annular metal strip is embedded in the second annular groove.

6. The PP-R pipe gasket according to claim 5, characterized in that: The first annular groove on the outer circumference of the rubber sealing ring has a semi-circular or trapezoidal cross section, forming an interference fit with the sealing ring.

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