A connection pipe fitting with improved connection tightness

Abstract

The utility model relates to the technical field of pipe fitting, especially improve the connecting pipe fitting of sealing performance, realize high sealing performance, deformation resistance and long life through structural innovation, including pipe fitting body, pipe fitting body has the flow channel with the connection interface and the communication of connection interface, the inside of connection interface convex one is the end face of annular structure, the end face recessed in first annular sealing groove, the inside of connection interface and located the upside of end face is equipped with second annular sealing groove, first annular sealing groove inlay is equipped with elastic support and rubber seal ring, the elastic support is the wavy structure, the elastic support distributes in the bottom of first annular sealing groove, rubber seal ring distributes in the upside of elastic sealing ring, the outer circumferential surface of rubber seal ring is equipped with annular groove, the annular groove inlay is equipped with sealing ring, when rubber seal ring inlay is equipped with first annular sealing groove, the outer end of sealing ring inlay is equipped with second annular sealing groove.

Description

Technical Field

[0001] This utility model relates to the field of pipe fittings technology, and in particular to a connecting pipe fitting that improves the sealing performance of the connection. Background Technology

[0002] Existing plastic water pipe fittings, such as tee and keel fittings, are typically connected to the pipes via 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; plastic materials have low rigidity and are prone to micro-deformation of the sealing surface when subjected to long-term water pressure fluctuations or thermal expansion and contraction of pipelines; rubber seals are prone to cracking under the action of ultraviolet rays, ozone, or chemical media, which shortens the service life of pipe fittings. Utility Model Content

[0004] Therefore, in view of the above problems, this utility model provides a connecting pipe fitting that improves the sealing performance of the connection, and achieves high sealing performance, deformation resistance and long service life through structural innovation.

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

[0006] A connecting pipe fitting for improving connection sealing includes a fitting body with a connection interface and a flow channel communicating with the connection interface. The inner side of the connection interface has a protruding annular end face, which is recessed in a first annular sealing groove. A second annular sealing groove is provided on the inner side of the connection interface, above the end face. An elastic support member and a rubber sealing ring are embedded in the first annular sealing groove. The elastic support member has a wavy structure and is distributed at the bottom of the first annular sealing groove. The rubber sealing ring is distributed above the elastic sealing ring. An annular groove is provided on the outer circumferential surface of the rubber sealing ring, and a sealing ring is embedded in the annular groove. When the rubber sealing ring is embedded in the first annular sealing groove, the outer end of the sealing ring is embedded in the second annular sealing groove.

[0007] Furthermore, the elastic support is a metal spring sheet with a wave crest height of 0.5mm to 2mm and a wave pitch of 2mm to 5mm, so as to provide an axial elastic compensation of ≥1mm.

[0008] Furthermore, the cross-section of the annular groove on the outer circumference of the rubber sealing ring is semi-circular or trapezoidal, forming an interference fit with the sealing ring.

[0009] Furthermore, the bottom of the second annular sealing groove is provided with an annular protrusion. When the sealing ring is embedded in the second annular sealing groove, the annular protrusion is pressed into the surface of the sealing ring to form a local deformation with a deformation depth of 0.1mm to 0.5mm.

[0010] Furthermore, the inner wall of the flow channel of the pipe body is provided with a spiral guide rib, the pitch of the spiral guide rib is 1 to 3 times the diameter of the flow channel, and the height of the spiral guide rib is 0.3 mm to 1 mm.

[0011] Furthermore, the sidewall of the first annular sealing groove is provided with an inclined guide surface with an inclination angle of 5° to 15°, and the opening width of the second annular sealing groove is 0.1 mm to 0.3 mm larger than the diameter of the sealing ring.

[0012] By adopting the aforementioned technical solution, the beneficial effects of this utility model are as follows: This connecting pipe fitting, which improves the sealing performance, forms a double sealing barrier by setting a composite sealing structure of an elastic support and a rubber sealing ring in the connecting pipe fitting. This effectively solves the problem that the single rubber sealing ring in the prior art is prone to leakage due to material aging or temperature changes. At the same time, the corrugated elastic support can dynamically absorb the axial stress generated by the thermal expansion and contraction of the pipeline or water pressure fluctuations, prevent micro-deformation of the sealing surface, and significantly improve the long-term sealing reliability of the connection. In addition, the split sealing design allows the rubber sealing ring and the sealing ring to be independently selected with chemically resistant materials, further extending the service life of the pipe fitting in complex environments. 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 yes Figure 2 A magnified view of a section at point A in the middle;

[0016] Figure 4 This is a cross-sectional structural schematic diagram of the elastic support member in an embodiment of this utility model. Detailed Implementation

[0017] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0018] The embodiment of this utility model is as follows:

[0019] refer to Figures 1 to 4As shown, a connecting pipe fitting for improving connection sealing includes a fitting body 1. The fitting body 1 has a connecting interface 10 and a flow channel 20 communicating with the connecting interface 10. The inner side of the connecting interface 10 is provided with an annular end face 2. The end face 2 is recessed in a first annular sealing groove 3. The inner side of the connecting interface 10 and above the end face 2 is provided with a second annular sealing groove 4. An elastic support member 5 and a rubber sealing ring 6 are embedded in the first annular sealing groove 3. The elastic support member 5 has a wavy structure and is distributed at the bottom of the first annular sealing groove 3. The rubber sealing ring 6 is distributed above the elastic sealing ring 5. An annular groove 7 is provided on the outer circumferential surface of the rubber sealing ring 6. A sealing ring 8 is embedded in the annular groove 7. When the rubber sealing ring 6 is embedded in the first annular sealing groove 3, the outer end of the sealing ring 8 is embedded in the second annular sealing groove 4.

[0020] This improved pipe fitting enhances sealing performance by incorporating a composite sealing structure of an elastic support 5 and a rubber sealing ring 6, forming a double sealing barrier. This effectively solves the problem of leakage caused by material aging or temperature changes in existing single rubber sealing rings. Simultaneously, the corrugated elastic support 5 dynamically absorbs axial stress generated by thermal expansion and contraction of the pipeline or water pressure fluctuations, preventing micro-deformation of the sealing surface and significantly improving the long-term sealing reliability of the connection. Furthermore, the split sealing design allows for independent selection of chemically resistant materials for the rubber sealing ring 6 and the sealing ring 8, further extending the service life of the fitting in complex environments.

[0021] Specifically, the elastic support 5 is a metal spring sheet with a wave crest height of 0.5mm to 2mm, preferably 1.5mm, and a wave pitch of 2mm to 5mm, preferably 3mm, to provide an axial elastic compensation of ≥1mm. Using a metal spring sheet as the elastic support improves its temperature resistance range and fatigue resistance compared to traditional plastic supports, avoiding elastic failure caused by plastic aging. By optimizing the crest height and wave pitch, the axial elastic compensation is ensured to be ≥1mm, which can fully adapt to the maximum expected deformation of the pipeline caused by temperature changes, fundamentally eliminating the risk of seal loosening caused by thermal expansion and contraction.

[0022] Furthermore, the cross-section of the annular groove 7 on the outer circumference of the rubber sealing ring 6 is semi-circular or trapezoidal, preferably trapezoidal, forming an interference fit with the sealing ring 8. The trapezoidal annular groove on the outer circumference of the rubber sealing ring 6, forming an interference fit with the sealing ring 8, increases the sealing contact area and improves the initial sealing pressure, effectively compensating for local leakage caused by unevenness of the pipe end face during installation. At the same time, the mechanical limiting effect of the annular groove 7 can prevent the sealing ring 8 from shifting under fluid pressure impact or vibration environment, significantly enhancing the vibration resistance of the connection.

[0023] Furthermore, the bottom of the second annular sealing groove 4 is provided with an annular protrusion 9. When the sealing ring 8 is embedded in the second annular sealing groove 4, the annular protrusion 9 is pressed into the surface of the sealing ring 8 to form a local deformation with a deformation depth of 0.1mm to 0.5mm, preferably 0.2mm. The annular protrusion 9 at the bottom of the second annular sealing groove 4 forms a micro-mechanical interlocking sealing line by pressing into the surface of the sealing ring 8 by 0.2mm, which fills the micro-gap between the sealing ring 8 and the sealing groove 7, thereby reducing the leakage rate in the airtightness test. In addition, the local deformation increases the surface tension of the sealing ring 8, reduces the intrusion path of ozone or ultraviolet rays, and delays the rubber cracking time to more than 10 years, which is particularly suitable for long-term outdoor exposure scenarios.

[0024] In this embodiment, the inner wall of the flow channel 20 of the pipe body 1 is provided with a spiral guide rib 11. The pitch of the spiral guide rib 11 is twice the diameter of the flow channel, and the height of the spiral guide rib 11 is 0.3mm to 1mm, preferably 0.5mm. The spiral guide rib 11 provided on the inner wall of the flow channel 20 can convert turbulent energy into rotational kinetic energy, thereby reducing fluid resistance and reducing the direct erosion of the sealing surface by high-speed fluid, thus preventing the seal from failing prematurely due to wear. After fluid simulation optimization, when the pitch is designed to be twice the diameter of the flow channel and the height is 0.5mm, the pressure loss can be reduced while ensuring the flow guiding effect, which is suitable for energy-saving retrofit of long-distance water transmission systems.

[0025] Furthermore, the sidewall of the first annular sealing groove 3 is provided with an inclined guide surface 12, with an inclination angle of 5° to 15°, preferably 8°. The opening width of the second annular sealing groove 4 is 0.1mm to 0.3mm larger than the diameter of the sealing ring 8, preferably 0.2mm. The 8° inclined guide surface design of the sidewall of the first annular sealing groove 3 shortens the assembly time of the rubber sealing ring 6 and reduces the installation misalignment rate, greatly improving production efficiency. The reserved design that the opening width of the second annular sealing groove 4 is 0.2mm larger than the diameter of the sealing ring 8 provides space for the sealing ring 8 to expand and contract with temperature, avoiding the problem of the sealing ring being squeezed and broken when shrinking at low temperature or the sealing groove cracking when expanding at high temperature.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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 connecting pipe fitting for improving connection sealing performance, characterized in that: The device includes a pipe body, which has a connection interface and a flow channel communicating with the connection interface. The inner side of the connection interface has a protruding end face with an annular structure. The end face is recessed in a first annular sealing groove. The inner side of the connection interface and above the end face has a second annular sealing groove. An elastic support member and a rubber sealing ring are embedded in the first annular sealing groove. The elastic support member has a wavy structure and is distributed at the bottom of the first annular sealing groove. The rubber sealing ring is distributed on the upper side of the elastic sealing ring. An annular groove is provided on the outer circumferential surface of the rubber sealing ring. A sealing ring is embedded in the annular groove. When the rubber sealing ring is embedded in the first annular sealing groove, the outer end of the sealing ring is embedded in the second annular sealing groove.

2. The connecting pipe fitting for improving connection sealing according to claim 1, characterized in that: The elastic support is a metal spring sheet with a wave crest height of 0.5mm to 2mm and a wave pitch of 2mm to 5mm, so as to provide an axial elastic compensation of ≥1mm.

3. The connecting pipe fitting for improving connection sealing according to claim 1, characterized in that: The cross-section of the annular groove on the outer circumference of the rubber sealing ring is semi-circular or trapezoidal, forming an interference fit with the sealing ring.

4. The connecting pipe fitting for improving connection sealing according to claim 3, characterized in that: The bottom of the second annular sealing groove is provided with an annular protrusion. When the sealing ring is embedded in the second annular sealing groove, the annular protrusion is pressed into the surface of the sealing ring to form a local deformation with a deformation depth of 0.1mm to 0.5mm.

5. The connecting pipe fitting for improving connection sealing according to any one of claims 1 to 4, characterized in that: The inner wall of the flow channel of the pipe body is provided with a spiral guide rib. The pitch of the spiral guide rib is 1 to 3 times the diameter of the flow channel, and the height of the spiral guide rib is 0.3 mm to 1 mm.

6. The connecting pipe fitting for improving connection sealing according to claim 5, characterized in that: The sidewall of the first annular sealing groove is provided with an inclined guide surface with an inclination angle of 5° to 15°, and the opening width of the second annular sealing groove is 0.1 mm to 0.3 mm larger than the diameter of the sealing ring.

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