Magnet driven plug-type pipe joint seal

Abstract

The application discloses a magnet-driven sealing device for a plug-in pipe joint, which comprises an outer pipe, an inner pipe and a sealing ring. The end of the inner pipe is provided with a groove, and the radial section of the groove is large inside and small outside. The sealing ring comprises a body, a boss, a protrusion, a sealing skirt and several metal strips. The end surface of the body is provided with an annular arc-shaped groove, and the sealing skirt is provided with an outer conical surface. The metal strips are all ferromagnetic materials, and each metal strip comprises a front body section, a middle straight section, a terminal straight section and a closing ring. The front section of the front body section is arranged in the body and the sealing lip, and the rear section of the front body section, the middle straight section, the terminal straight section and the closing ring are arranged in the arc-shaped groove. A magnet ring is sleeved on the outer pipe. The sealing ring has the advantages of simple structure, easy processing and implantation of the plug-in joint. The axial relative displacement of the inner and outer pipes will not affect the sealing, and the sealing ring can generate a pre-pressure. The sealing device has good adaptability to the misalignment and large gap of the pipe plug-in part, and can improve the sealing effect.

Description

Technical Field

[0001] This invention relates to a sealing device for plug-in pipe fittings, and more particularly to a magnet-driven sealing device for PVC pipe fittings. Background Technology

[0002] PVC pipes are widely used in water supply. For ease of installation, plug-in connections are often used. This involves enlarging one end of the pipe and inserting the connecting pipe directly into the enlarged end, with a sealing device installed at the joint. The sealing performance of the plug-in connection is one of the key factors that determines whether the pipeline can successfully complete its transportation task.

[0003] Patent CN2012203518339 discloses a plastic-coated steel pipe plug-in connector, which adopts an internal connection form. It achieves sealing by setting a sealing ring in the sealing groove of the interface pipe, and the sealing ring and the plug are interference fit. However, in this structure, the sealing ring and the locking element interact within a limited space. The axial displacement of the locking element affects the fit between the sealing element and the plug. When the pipe is subjected to axial force and internal pressure, it is difficult to insert the sealing ring into the plug interface. In addition, the misalignment of the pipe plug part, large gap, and insufficient surface cleanliness reduce the sealing effect of the plug-in connector. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a magnet-driven plug-in pipe joint sealing device. Its sealing ring has a simple structure, is easy to process and implant into the plug interface, and is independent of and does not interfere with the internal locking device. The axial relative displacement of the inner and outer pipes will not affect the seal. In addition, the sealing ring generates pre-pressure, which has good adaptability to problems such as misalignment of pipe plug joints, large gaps, and insufficient surface cleanliness, and can improve the sealing effect.

[0005] To achieve the above objectives, the present invention provides a magnet-driven plug-in pipe joint sealing device, comprising an outer tube, an inner tube, and a sealing ring, wherein the end of the inner tube is placed inside the outer tube; characterized in that: the end of the inner tube is provided with a groove, the radial cross-section of which is larger inside and smaller outside; the sealing ring comprises a body, a boss fixed to the middle of the rear end of the body, a protrusion fixed to the rear end of the boss, a sealing skirt fixed to the outer edge of the front end of the body, and several metal strips arranged circumferentially, the radial cross-section of the protrusion is larger than that of the boss, both the boss and the protrusion are placed in the groove, and an annular arc-shaped groove is provided on the end face of the body radially outside the boss; the outer circular surface of the sealing skirt is an outer conical surface that gradually increases in size away from the end of the inner tube; All metal strips are made of ferromagnetic material. Each metal strip includes a front main body section, a middle straight section, an end straight section, and a closing ring connected in sequence. The front main body sections are all tapered in the same direction as the outer conical surface. The front section of the front main body section is placed inside the body and sealing skirt. The rear section, middle straight section, end straight section, and closing ring of the front main body section are all placed in an arc-shaped groove. The front main body section, middle straight section, and end straight section are arranged at an angle. The front main body section and the middle straight section are arranged at an obtuse angle and connected by a first corner section. The middle straight section and the end straight section are arranged at an acute angle and connected by a second corner section. Both the first corner section and the second corner section are arc-shaped. A magnetic ring is slidably fitted on the outer tube.

[0006] During installation, external force is used to bend the outer conical surface of the sealing skirt radially inward. The arc-shaped groove allows for significant bending deformation, which in turn causes the front main body section, the middle straight section, and the end straight section to rotate radially inward. This ensures that the closing ring rests against the end of the inner tube, preventing the metal strip from rebounding, and the sealing skirt remains in a closed state. At this point, the inner tube and sealing ring can be easily inserted into the outer tube. The first and second corner sections are both arc-shaped, which facilitates the closing of the sealing skirt and generates a large rebound force when rotating it outward. This facilitates insertion into the insertion interface and increases the pre-pressure of the sealing skirt, thereby improving the sealing effect. Then, the magnetic ring is moved to the same radial position as the front section of the front main body section, and the magnetic... The force attracts the metal strip, causing the sealing skirt to flip outward. Its outer conical surface expands outward and adheres tightly to the inner cylindrical surface of the outer tube, thereby generating pre-pressure. At the same time, the closing ring disengages from the end face of the inner tube. After pressure is introduced into the tube, the sealing skirt is inserted into the gap between the inner and outer tubes under the action of internal pressure, and becomes tighter and tighter, achieving a self-sealing effect. The sealing ring of this sealing device has a simple structure, is easy to process and insert into the insertion interface, and is independent of the internal locking device and does not interfere with it. The axial relative displacement of the inner and outer tubes will not affect the seal. In addition, the pre-pressure generated by the sealing ring has good adaptability to problems such as misalignment of pipe insertion parts, large gaps, and insufficient surface cleanliness, and can improve the sealing effect. As a further improvement of the present invention, the boss is a plurality of columnar bosses or annular bosses, and correspondingly, the groove is a plurality of columnar grooves or annular grooves; both can realize the connection between the two. As a further improvement of the present invention, the inner circular surface of the sealing skirt is provided with an arc-shaped groove cone surface; this can improve the uniformity of the deformation of the sealing skirt and increase the effective sealing area. In summary, the sealing ring of this invention has a simple structure, is easy to process and implant into the insertion interface, and is independent of and does not interfere with the internal locking device. The axial relative displacement of the inner and outer pipes will not affect the seal. In addition, the sealing ring generates pre-pressure, which has good adaptability to problems such as misalignment of pipe insertion parts, large gaps, and insufficient surface cleanliness, and can improve the sealing effect. Attached Figure Description

[0007] Figure 1 This is a structural diagram of the sealing skirt in a naturally extended state according to an embodiment of the present invention.

[0008] Figure 2 for Figure 1 A magnified view of a portion of the central arc-shaped groove.

[0009] Figure 3 This is a structural diagram of the sealing ring in a contracted state according to an embodiment of the present invention.

[0010] Figure 4 for Figure 3 A magnified view of a portion of the central arc-shaped groove.

[0011] Figure 5 This is a structural diagram of the sealing ring after it rebounds from the pipe insertion state according to an embodiment of the present invention.

[0012] Figure 6 This is a structural diagram of the sealing ring under pressure according to an embodiment of the present invention. Detailed Implementation

[0013] To better understand the purpose, technical solution, and beneficial effects of this invention, the invention will be further described below with reference to the accompanying drawings, but the scope of protection of this invention is not limited to the following embodiments.

[0014] like Figures 1 to 2As shown, a sealing device for a socket-type pipe joint in this embodiment includes an outer tube 1, an inner tube 2, and a sealing ring 3. The end of the inner tube 2 is placed inside the outer tube 1. The end of the inner tube 2 is provided with an annular groove 4, the radial cross-section of which is larger inside and smaller outside. The sealing ring 3 includes a body 6, an annular boss 7 integrally fixed to the middle of the rear end of the body 6, a protrusion 8 integrally fixed to the rear end of the annular boss 7, a sealing skirt 9 integrally fixed to the outer edge of the front end of the body 6, and several metal strips 11 evenly arranged in the circumference. The radial cross-section of the protrusion 8 is larger than that of the annular boss 7. Both the annular boss 7 and the protrusion 8 are placed in the annular groove 4. The protrusion 8 can prevent the sealing ring 3 from detaching from the inner tube 2. An annular arc-shaped groove 5 is provided on the end face of the body 6 on the radially outer side of the annular boss 7. The outer circular surface of the sealing skirt 9 is an outer conical surface 1 that gradually increases in size away from the end of the inner tube. 0; The metal strips 11 are all made of ferromagnetic material. Each metal strip 11 includes a front main body section 12, a first corner section 13, a middle straight section 14, a second corner section 15, an end straight section 16, and a closing ring 17 connected in sequence. The front main body sections 12 are all cone-shaped and aligned with the outer conical surface 10. The front section of the front main body section 12 is placed inside the body 6 and the sealing skirt 9. The rear section of the front main body section 12, the first corner section 13, the middle straight section 14, the second corner section 15, the end straight section 16, and the closing ring 17 are all placed in the arc-shaped groove 5. The front main body section 12 and the middle straight section 14 are set at an obtuse angle, and the middle straight section 14 and the end straight section 16 are set at an acute angle. The first corner section 13 and the second corner section 15 are both arc-shaped. The inner circular surface of the sealing skirt 9 is provided with an arc-shaped groove cone surface 18. A magnetic ring 19 is slidably fitted on the outer tube 1.

[0015] The main body of sealing ring 3 is made of rubber; during installation, if... Figure 3 , Figure 4 As shown, by applying external force, the outer conical surface 10 of the sealing skirt 9 is bent radially inward. The arc-shaped groove 5 can achieve a large bending deformation, thereby causing the front main body section 12, the first corner section 13, the middle straight section 14, the second corner section 15, and the end straight section 16 to rotate radially inward. This causes the closing ring 17 to press against the end of the inner tube 2, preventing the metal strip 11 from rebounding. The sealing skirt 9 remains in a closed state, at which point the inner tube 2 and the sealing ring 3 can be easily inserted into the outer tube 1. Figure 5 As shown, the moving magnetic ring 19 is positioned radially at the same point as the front section of the main body. Magnetic force attracts the metal strips 11, causing the sealing skirt 9 to flip outwards. Its outer conical surface 10 expands outwards and adheres tightly to the inner cylindrical surface of the outer tube 1, thus generating pre-pressure. Simultaneously, the closing ring 17 disengages from the end face of the inner tube 2. After pressure is introduced into the tube, as... Figure 6As shown, the magnetic ring 19 can be removed. At this time, the sealing skirt 9 is inserted into the gap between the inner tube 2 and the outer tube 1 under the action of internal pressure, and becomes tighter and tighter, achieving a self-sealing effect. The sealing ring structure of this sealing device is simple, easy to process and implant into the insertion interface, and is independent of the internal locking device and does not interfere with it. The axial relative displacement of the inner and outer tubes will not affect the seal. In addition, the sealing ring 3 generates pre-pressure, which has good adaptability to problems such as misalignment of pipe insertion parts, large gaps, and insufficient surface cleanliness, and can improve the sealing effect. The front main body section 12 and the middle straight section 14 are set at an obtuse angle, which makes the sealing skirt 9 easy to close and easy to implant into the insertion interface. In addition, the middle straight section 14 and the end straight section 16 are set at an acute angle, and the first corner section 13 and the second corner section 15 are both arc-shaped, which generates a large rebound force when flipped outward, which can improve the pre-pressure and sealing effect of the sealing skirt 9. The arc-shaped groove cone surface 18 on the inner circular surface of the sealing skirt 9 can improve the uniformity of the deformation of the sealing skirt and ensure the rebound force and sealing area. The present invention is not limited to the above embodiments. For example, the annular boss can be replaced with several columnar bosses, and the annular groove can be replaced with several columnar grooves, which can achieve the connection between the two. The overall convex head of the embodiment is a spherical structure, but it can also be a spindle-shaped structure or a cubic structure.

Claims

1. A magnet-driven plug-in pipe joint sealing device, comprising an outer tube, an inner tube, and a sealing ring, wherein the end of the inner tube is placed inside the outer tube; characterized in that: The inner tube has a groove at its end, with a radial cross-section that is larger on the inside and smaller on the outside. The sealing ring includes a body, a boss fixed to the middle of the rear end of the body, a protrusion fixed to the rear end of the boss, a sealing skirt fixed to the outer edge of the front end of the body, and several metal strips arranged circumferentially. The radial cross-section of the protrusion is larger than that of the boss. Both the boss and the protrusion are placed in the groove. An annular arc-shaped groove is provided on the end face of the body on the radially outer side of the boss. The outer circular surface of the sealing skirt is an outer conical surface that gradually increases in size as it moves away from the end of the inner tube. The metal strips are all made of ferromagnetic material, and each metal strip includes a front main body section, a middle section, and a middle section connected in sequence. The front main body section, including the straight section at the front, the straight section at the end, and the closing ring, is conical in the same direction as the outer conical surface. The front section of the front main body section is placed inside the body and the sealing skirt. The rear section, the middle straight section, the straight section at the end, and the closing ring of the front main body section are all placed in an arc-shaped groove. The front main body section, the middle straight section, and the straight section at the end are arranged at an angle. The front main body section and the middle straight section are arranged at an obtuse angle and connected by a first corner section. The middle straight section and the straight section at the end are arranged at an acute angle and connected by a second corner section. Both the first corner section and the second corner section are arc-shaped. A magnetic ring is slidably fitted on the outside of the outer tube.

2. The magnet-driven plug-in pipe joint sealing device according to claim 1, characterized in that: The boss is a plurality of columnar bosses or annular bosses; the groove is a plurality of columnar grooves or annular grooves.

3. A magnet-driven plug-in pipe joint sealing device according to claim 1 or 2, characterized in that: The inner circular surface of the sealing skirt is provided with an arc-shaped groove cone surface.

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