Electromagnetic welding rubber ring double-sealing pipe fitting

Abstract

The utility model discloses an electromagnetic welding rubber ring double-sealing pipe fitting. The technical problem that an existing electromagnetic welding pipe fitting is poor in sealing effect and prone to leakage is solved. The annular limiting table is arranged at the position, corresponding to the designed insertion depth of a pipe, of the inner edge face of the pipe fitting, the sealing ring is attached to the corresponding end face of the limiting table and used for abutting against the end of the pipe to be inserted, and the electromagnetic induction ring is wrapped in the end of the pipe fitting. The sealing groove is formed in the position, corresponding to the position between the electromagnetic induction ring and the limiting table, of the inner edge face of the pipe fitting, and the sealing ring is embedded in the sealing groove; the corresponding cross section of the sealing ring is triangular, and the inclined face of the sealing ring is used for abutting against the end of the pipe. The electromagnetic welding rubber ring double-sealing pipe fitting has the advantages of being firm in welding effect, excellent in sealing effect and the like.

Description

Technical Field

[0001] The present application relates to the technical field of water supply and drainage, and specifically relates to an electromagnetic welding rubber ring double-sealing pipe fitting. Background Art

[0002] The welding of pipes and pipe fittings is a common connection technology in pipeline installation and maintenance, and there are various welding methods for pipes and pipe fittings. For example, hot melt welding is particularly suitable for the welding of plastic pipes such as PPR and PE. By using a hot melt tool to heat the pipes and pipe fittings, they are melted and then connected together. During hot melt welding, it is necessary to strictly control the heating temperature and time to ensure the welding quality. Electrofusion welding is also a common welding method. Electrofusion welding uses the heating wire on the inner surface of the electrofusion pipe fitting to generate high temperature after being energized, melting the inner surface of the pipe fitting and the outer surface of the pipeline, and then fusing them together through the thermal expansion effect of the plastic pipe itself. After cooling and solidifying, a firm joint is formed. This welding method mainly relies on the heat generated by the current to melt the plastic, thereby achieving a tight combination of the pipe and the pipe fitting. However, since electrofusion welding requires pre-burying heating wires in the pipe fitting and leaving joints on the surface of the pipe fitting, the cost of the pipe fitting is relatively high and the production process is complex. In contrast, electromagnetic welding is a method of achieving plastic welding by using the heat generated by an electromagnetic field. It only needs to pre-bury an electromagnetic induction component at the end of the pipe fitting, and use an electromagnetic induction device to generate eddy currents in the welding area, which are then converted into heat energy to melt the plastic and achieve the purpose of welding and fusion.

[0003] However, in the process of implementing the technical solution in the embodiment of the present application, the inventors of the present application found that the electromagnetic induction components pre-buried in the existing electromagnetic welding pipe fittings are directly exposed at the inner edge surface of the pipe fitting, which is easy to oxidize and rust, affecting the welding, and the sealing effect between the pipe and the pipe fitting is poor, and leakage is likely to occur. Moreover, after leakage, it will exacerbate the oxidation and rust of the electromagnetic induction components, resulting in the failure of connection or sealing.

[0004] The information disclosed in this background art section is only used to deepen the understanding of the background art of the present disclosure, and should not be regarded as an admission or any form of suggestion that this information constitutes the prior art known to those skilled in the art. Summary of the Invention

[0005] In view of at least one of the above technical problems, the present disclosure provides an electromagnetic welding rubber ring double-sealing pipe fitting, aiming to solve the technical problem that the existing electromagnetic welding pipe fitting has a poor sealing effect and is prone to leakage.

[0006] According to one aspect of the present disclosure, there is provided an electromagnetic welding rubber ring double-sealing pipe fitting, which includes an annular limiting platform provided at a position corresponding to the designed insertion depth of the pipe on the inner edge surface of the pipe fitting, a sealing ring attached to the corresponding end face of the limiting platform for abutting against the end of the pipe to be inserted, an electromagnetic induction ring covered inside the end of the pipe fitting, a sealing groove opened at a position corresponding to the space between the electromagnetic induction ring and the limiting platform on the inner edge surface of the pipe fitting, and a sealing ring embedded in the sealing groove; the cross-section of the sealing ring is triangular, and the inclined surface of the sealing ring is used to abut against the end of the pipe.

[0007] In some embodiments of the present disclosure, the height of the limiting platform protruding from the inner edge surface of the pipe fitting is greater than the width of the corresponding joint end face between the sealing ring and the limiting platform.

[0008] In some embodiments of the present disclosure, positioning ribs for limiting the sealing ring are provided at the edge of the limiting platform.

[0009] In some embodiments of the present disclosure, an annular limiting groove matching the sealing ring is provided at a position corresponding to the inner edge surface of the limiting platform close to the pipe fitting.

[0010] In some embodiments of the present disclosure, the cross-section of the sealing ring is circular.

[0011] In some embodiments of the present disclosure, the cross-section of the sealing ring is triangular, and the edges of the sealing ring are in contact with the outer edge surface of the pipe to be inserted.

[0012] In some embodiments of the present disclosure, an annular groove is provided at the inner edge of the end of the pipe fitting, and a sealing strip is embedded in the annular groove and sleeved on the outer edge surface of the pipe to be inserted, and the contour shape of the sealing strip matches the annular groove.

[0013] In some embodiments of the present disclosure, the cross-section of the sealing strip is wedge-shaped.

[0014] One or more technical solutions provided in the embodiments of the present application have at least any one of the following technical effects or advantages:

[0015] Double sealing is achieved through the sealing ring at the limiting platform and the sealing ring embedded on the inner edge surface of the pipe fitting, ensuring the anti-leakage effect after the connection between the pipe fitting and the pipe. Among them, the cross-section of the sealing ring is triangular, which can avoid the problem that the sealing ring is skewed or falls off after being stressed and affects the sealing effect; in addition, by covering the electromagnetic induction ring inside the end of the pipe fitting, the purpose of improving the welding strength and welding efficiency can also be achieved. Description of the Drawings

[0016] Figure 1 It is a half-sectional structure schematic diagram of the electromagnetic welding rubber ring double-sealing pipe fitting in an embodiment of the present application.

[0017] Figure 2 This is a cross-sectional view of the cooperation between the limiting platform and the sealing ring in another embodiment of the present application.

[0018] Figure 3 This is a cross-sectional view of the assembly structure of the rubber ring double-sealing pipe fitting and the pipe in an embodiment of the present application.

[0019] In the above figures, 1 is the limiting platform, 11 is the positioning rib, 12 is the limiting groove, 2 is the sealing ring, 3 is the electromagnetic induction ring, 4 is the sealing ring, 5 is the annular groove, 6 is the pipe, and 7 is the sealing tape. Detailed implementation manners

[0020] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "vertical", "horizontal", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application 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 should not be construed as a limitation to the present application.

[0021] In order to better understand the technical solution of the present application, the above technical solution will be described in detail below in conjunction with the accompanying drawings of the specification and specific implementation manners.

[0022] To solve the technical problems of low welding strength and poor sealing effect of existing electromagnetic welded pipe fittings, this example discloses an electromagnetic welded rubber ring double-sealing pipe fitting. Refer to Figure 1 , which includes a limiting platform 1 provided on the inner edge surface of the pipe fitting. In this example, the limiting platform 1 is arranged in a ring shape in contact with the inner edge surface of the pipe fitting, its annular surface is coaxial with the pipe fitting, and the position of the limiting platform 1 from the port of the pipe fitting matches the designed insertion depth of the pipe. Thus, the insertion depth of the pipe is restricted through the limiting platform 1, avoiding problems such as too long insertion of the pipe affecting the construction cost or affecting the insertion of the pipe on the opposite side, and too short insertion of the pipe resulting in relatively low subsequent welding strength. In this embodiment, refer to Figure 1 , the pipe fitting is used for connecting two pipes. Therefore, pipes need to be inserted into both ends of the pipe fitting. Thus, in some embodiments, two limiting platforms 1 for restricting the insertion depths of the pipes on both sides are symmetrically arranged on the inner edge surface of the pipe fitting with respect to the middle plane perpendicular to the axis of the pipe; in this embodiment, considering that setting two limiting platforms will increase the length of the pipe fitting and thus increase the cost of the pipe fitting, an annular limiting platform 1 is arranged at the middle plane of the pipe fitting, and the insertion depths of the pipes at both ends are restricted through the end faces on both sides of the limiting platform 1.

[0023] Considering that when the pipe is cut, there may be burrs on the end face of the pipe, which may affect the close contact between the end face of the pipe and the limiting platform 1. As a result, water will leak through the gap between the end face of the pipe and the limiting platform 1, affecting the sealing performance of the connection between the pipe fitting and the pipe. Therefore, in this embodiment, see Figure 1 , sealing rings 2 are respectively and closely arranged on both sides of the limiting platform 1. The sealing rings 2 are made of rubber, and the sealing between the end face of the pipe and the limiting platform 1 is realized through the elastic deformation characteristic of the sealing rings 2. Specifically, see Figure 1 , in this example, the cross-section of the limiting platform 1 is triangular and is a right triangle. Its outer diameter matches the inner diameter of the pipe fitting, and the two right-angled sides are respectively in contact with the inner surface of the pipe fitting and the end face of the limiting platform 1. Thus, the inclined surface of the sealing ring 2 corresponding to the hypotenuse of the triangular cross-section contacts the end of the pipe, and is in a reduced-diameter state along the pipe insertion direction. On the one hand, through the contact between the inclined surface of the sealing ring 2 and the end of the pipe fitting, the elastic deformation characteristic of the sealing ring ensures complete sealing of the gap between the end of the pipe fitting and the limiting platform; on the other hand, since the outer diameter of the pipe cannot be exactly the same as the inner diameter of the pipe fitting and there is a certain error, that is, the outer diameter of the pipe is smaller than the inner diameter of the pipe fitting, the end of the pipe can effectively press against the sealing ring and form a limit for the sealing ring to prevent the sealing ring from falling off. In this embodiment, in order to further prevent the sealing ring 2 from falling off, see Figure 1 , the cross-section width of the sealing ring 2 is set to be smaller than the width of the limiting platform 1, that is, the height of the limiting platform 1 protruding from the inner surface of the pipe fitting is greater than the width of the end face corresponding to the sealing ring that fits the limiting platform. Furthermore, a protruding positioning rib 11 is provided at the edge of the limiting platform 1 to limit the sealing ring 2 through the positioning rib and prevent it from being skewed or falling off during the pipe insertion process and use.

[0024] In some other embodiments, see Figure 2 , annular limiting grooves 12 are respectively provided at the joints between the two sides of the limiting platform 1 and the inner surface of the pipe fitting. The contour of the limiting groove matches the contour of the sealing ring 2. Similarly, the cross-section of the sealing ring 2 is a right triangle, and the two groove walls of the limiting groove 12 are respectively in contact with one right-angled side and the inclined surface of the triangular cross-section of the sealing ring 2. After the sealing ring 2 is correspondingly fitted into the limiting groove 12, the end face corresponding to the other right-angled side of the cross-section of the sealing ring 2 contacts the end of the pipe fitting to be inserted to achieve sealing. Thus, while supporting the sealing ring 2, the limiting platform 1 limits the sealing ring 2 to prevent the sealing ring from detaching.

[0025] In addition, in this embodiment, see Figure 1, the electromagnetic induction ring 3 is wrapped inside the end of the pipe fitting. Thus, during electromagnetic welding, there is no direct contact between the electromagnetic induction ring and the pipe material at the pipe fitting. Instead, the material at the inner edge surface of the pipe fitting inside the electromagnetic induction ring is heated, and the material of the same type as that at the pipe material is heated and melted together, ensuring the welding strength. At the same time, the electromagnetic induction ring being wrapped inside the end of the pipe fitting can also avoid problems such as easy oxidation that affect the welding strength caused by the existing electromagnetic induction components of the pipe fitting being exposed at the inner edge surface between the pipes.

[0026] Considering that the sealing ring 2 in close contact with the end surface of the pipe material cannot achieve reliable sealing, in the embodiment, refer to Figure 1 , an annular sealing groove is opened at the corresponding position of the inner edge surface of the pipe fitting between the electromagnetic induction ring 3 and the limiting platform 1, and a sealing ring 4 is embedded in the sealing groove. A second seal is formed through the contact between the sealing ring 4 and the outer edge surface of the pipe material, thereby improving the sealing effect. Specifically, in this example, the cross-section of the sealing ring 4 is circular, and the depth of the sealing groove is less than the cross-sectional diameter of the sealing ring 4. Thus, when the sealing ring 4 is correspondingly fitted into the sealing groove, the sealing ring protrudes from the inner edge surface of the pipe fitting, ensuring reliable contact between the sealing ring and the pipe material. In some other embodiments, in order to avoid the problem that the sealing ring is offset or detached from the sealing groove due to excessive pushing of the sealing ring by the pipe material during the insertion of the pipe material into the pipe fitting, which affects the sealing effect, the cross-section of the sealing ring in this example is correspondingly triangular, and the outer edge surface of the sealing ring is in close contact with the bottom of the sealing groove. Thus, the corresponding edges of the triangular cross-section of the sealing ring come into contact with the surface of the pipe material. Relying on the guiding effect of the inclined surface of the sealing ring and the characteristic that the deformation amount at the edges is relatively large, it ensures the smooth insertion of the pipe material.

[0027] In some other embodiments, in order to further improve the sealing reliability of the pipe fitting, refer to Figure 3 , an annular groove 5 is opened at the inner edge of the end of the pipe fitting, and a sealing tape 7 is provided in cooperation with the annular groove 5. In this example, the inner diameter of the sealing tape 7 matches the outer diameter of the pipe material 6. The sealing tape 7 is sleeved on the outer edge surface of the pipe material, and the distance between the sealing tape 7 and the end of the pipe material to be inserted is less than the designed insertion depth of the pipe material, thereby ensuring that the sealing tape 7 can be correspondingly inserted into the annular groove 5 when inserted with the pipe material to play a sealing role. Additionally, in this example, in order to ensure that the sealing tape 7 can be smoothly inserted into the annular groove 5 with the pipe material, the cross-section of the sealing tape 7 is set to be wedge-shaped, that is, the outer edge surface of the sealing tape is a reduced-diameter part along the insertion direction of the pipe material. Thus, the inclined surface of the sealing tape can effectively contact the annular groove 5 to achieve the sealing effect.

[0028] Although some preferred embodiments of the present application have been described, those skilled in the art can make additional changes and modifications to these embodiments once they learn the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present application.

[0029] Obviously, those skilled in the art can make various changes and modifications to this application without departing from the spirit and scope of its inventive concept. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, this application is also intended to cover these changes and modifications.

Claims

1. An electromagnetic welding rubber ring double-sealed pipe fitting, characterized in that, It includes an annular limiting platform provided at a position on the inner edge surface of the pipe fitting corresponding to the designed insertion depth of the pipe material, a sealing ring attached to the corresponding end face of the limiting platform and used to abut against the end of the pipe material to be inserted, an electromagnetic induction ring coated inside the end of the pipe fitting, a sealing groove opened at a position on the inner edge surface of the pipe fitting corresponding to the position between the electromagnetic induction ring and the limiting platform, and a sealing ring embedded in the sealing groove; the corresponding cross-section of the sealing ring is triangular.

2. The electromagnetic welding rubber ring double-sealed pipe fitting according to claim 1, characterized in that, The height of the corresponding protrusion of the limiting platform from the inner edge surface of the pipe fitting is greater than the width of the corresponding fitting end face of the sealing ring and the limiting platform.

3. The electromagnetic welding rubber ring double-sealed pipe fitting according to claim 2, characterized in that, Positioning ribs for limiting the sealing ring are provided at the edge of the limiting platform.

4. The electromagnetic welding rubber ring double-sealed pipe fitting according to claim 1, characterized in that, An annular limiting groove matching the sealing ring is provided at a position on the limiting platform close to the corresponding position of the inner edge surface of the pipe fitting.

5. The electromagnetic welding rubber ring double-sealed pipe fitting according to claim 1, characterized in that, The corresponding cross-section of the sealing ring is circular.

6. The electromagnetic welding rubber ring double-sealed pipe fitting according to claim 1, wherein, The corresponding cross-section of the sealing ring is triangular, and the edges and corners of the sealing ring are correspondingly in contact with the outer edge surface of the pipe material to be inserted.

7. The electromagnetic welding rubber ring double-sealed pipe fitting according to claim 1, characterized in that, An annular groove is provided at the inner edge of the end of the pipe fitting, and a sealing strip corresponding to be sleeved on the outer edge surface of the pipe material to be inserted and with a contour shape matching the annular groove is embedded in the annular groove.

8. The electromagnetic welding rubber ring double-sealed pipe fitting according to claim 7, wherein, The corresponding cross-section of the sealing strip is wedge-shaped.

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