Electromagnetic pipe fitting induction insert

Abstract

The utility model discloses an induction insert of an electromagnetic welding pipe fitting. The electromagnetic induction pipe fitting aims at solving the technical problem that an electromagnetic induction piece of an existing electromagnetic induction pipe fitting is directly exposed in air, and the pipe fitting connection strength is affected after oxidation corrosion occurs. The metal ring net is wrapped in the end of the pipe fitting, a plurality of material passing holes are formed in the periphery of the metal ring net in an array mode, the positioning piece and the inner edge of the ring net are relatively nested and fixed, and the diameter of the inner edge of the positioning piece is consistent with that of the inner edge of the pipe fitting. The positioning piece comprises at least one positioning ring and a plurality of positioning ribs correspondingly connected with the positioning rings. Through the positioning pieces which are oppositely embedded and fixed at the inner edge of the metal ring net, the metal ring net is completely wrapped in the end head of the pipe fitting after the pipe fitting is subjected to injection molding, so that the metal ring net is prevented from being oxidized after being in contact with external air, and the problem that the welding strength of the pipe fitting and the pipe is influenced after the ring net is oxidized and rusted is solved.

Description

Technical Field

[0001] The present application relates to the field of electromagnetic welding, and particularly to an electromagnetic welding pipe fitting induction insert. Background Art

[0002] Electromagnetic welding technology is mainly based on the principle of electromagnetic induction heating, and conducts welding by generating high-frequency alternating current. During the welding process, the workpiece generates an electromagnetic induction force through the alternating current in the working coil, causing heat to be generated between the workpieces and fusing them together. Specifically, when the power supply provides energy, the high-frequency alternating current passes through the working coil to generate a high-frequency electromagnetic field, causing eddy currents to be generated in the metal at the pipe joint under the action of the electromagnetic induction force. When the eddy currents flow inside the metal, heat is generated due to the existence of resistance, heating the pipe joint to a molten state to achieve welding.

[0003] For example, in a patent document with a publication number of CN202442049U and an invention name of electromagnetic heating type electrofusion pipe fitting known to the inventor, it discloses an electromagnetic heating type electrofusion pipe fitting, which includes a pipe body and an electromagnetic induction heating wire provided on the inner surface of the pipe body.

[0004] However, during the process of implementing the technical solutions in the embodiments of the present application, the inventors of the present application found that the above technology has at least the following technical problems: its electromagnetic induction heating wire is made of metal and will be oxidized and rusted when directly exposed to the air. It needs to be polished before use, which is time-consuming and laborious and it is difficult to completely polish and remove the rust, thus affecting the firmness and reliability of the welding.

[0005] 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 implication that this information constitutes the prior art known to those skilled in the art. Summary of the Invention

[0006] In view of at least one of the above technical problems, the present disclosure provides an electromagnetic welding pipe fitting induction insert, aiming to solve the technical problem that the electromagnetic induction part of the existing electromagnetic induction pipe fitting is directly exposed to the air and affects the connection strength of the pipe fitting after oxidation and rusting.

[0007] According to one aspect of the present disclosure, there is provided an electromagnetic welding pipe fitting induction insert, which includes a metal ring net covered inside the end of the pipe fitting and having a plurality of material passing holes arranged in a circumferential array, and a positioning member nested and fixed relative to the inner edge of the ring net and having an inner edge diameter consistent with the inner edge diameter of the pipe fitting; the positioning member includes at least one positioning ring and a plurality of positioning ribs correspondingly connected to the positioning ring.

[0008] In some embodiments of the present disclosure, the electromagnetic welding pipe fitting induction insert includes two positioning rings correspondingly connected by the positioning ribs.

[0009] In some embodiments of the present disclosure, the electromagnetic welding pipe fitting induction insert includes a positioning ring, and the positioning ribs are correspondingly arranged along the circumference of the positioning ring.

[0010] In some embodiments of the present disclosure, a limiting shoulder for abutting against the end of the ring network is provided at the corresponding positioning ring or positioning rib.

[0011] In some embodiments of the present disclosure, the corresponding width of the limiting shoulder matches the thickness of the ring network.

[0012] In some embodiments of the present disclosure, a U-shaped limiting groove with a width matching the thickness of the ring network is formed between the limiting shoulder and the positioning ring or positioning rib.

[0013] 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:

[0014] (1) By relatively embedding and fixing the positioning member at the inner edge of the metal ring network, after the pipe fitting is injection-molded, the metal ring network is completely coated inside the end of the pipe fitting, thereby avoiding oxidation of the metal ring network after contacting with the outside air, and further avoiding the problem that the welding strength between the ring network and the pipe is affected after the ring network is oxidized and rusted; at the same time, since the metal ring network is completely coated inside the end of the pipe fitting, the bonding force between the pipe fitting and the ring network is stronger, avoiding problems such as falling off.

[0015] (2) By the limiting contact between the limiting shoulder correspondingly arranged at the positioning ring or positioning rib and the end of the ring network, the problem that the relative position between the positioning member and the ring network changes under the influence of the injection pressure, thereby affecting the positioning position of the ring network inside the end of the pipe fitting, is avoided, thereby ensuring that the ring network is reliably and completely coated.

[0016] (3) By adjusting the thickness of the positioning ring and the positioning rib, the amount of the molten material in the melting zone during electromagnetic welding can be adjusted, and further the regulation of the thermal expansion pressure during welding can be realized to ensure the welding strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of the ring network in an embodiment of the present application.

[0018] Figure 2 It is a schematic structural diagram of the positioning member in an embodiment of the present application.

[0019] Figure 3 It is a schematic structural diagram of the positioning member in another embodiment of the present application.

[0020] Figure 4 It is an assembly schematic diagram of the positioning member and the ring network in another embodiment of the present application.

[0021] Figure 5 It is a schematic structural diagram of the positioning member in still another embodiment of the present application.

[0022] Figure 6 This is a schematic structural diagram of the positioning member in another embodiment of the present application.

[0023] In the above figures, 1 is a ring network, 11 is a material passing hole, 2 is a positioning member, 21 is a positioning ring, 22 is a positioning rib, and 23 is a limiting shoulder. Detailed implementation manners

[0024] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "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, and 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 thus should not be construed as a limitation to the present application. And the "connection" and "coupling" involved in the present application, unless otherwise specified, all include direct and indirect connections (couplings).

[0025] 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.

[0026] To solve the problem that the electromagnetic induction member of the existing electromagnetic welded pipe fitting is directly exposed to the air at the inner edge of the pipe fitting, which affects the connection strength and reliability between the pipe fitting and the pipe after oxidation, this example discloses an electromagnetic welded pipe fitting induction insert, which includes a metal ring network wrapped in the end of the pipe fitting and a positioning member nested and fixed relative to the inner edge of the ring network.

[0027] In this embodiment, the ring network is made of a metal material and is used for electromagnetic induction heating to melt the material at the end of the surrounding pipe fitting, so as to realize the welding between the pipe fitting and the pipe. Among them, the inner diameter of the ring network is larger than the designed diameter of the inner edge of the pipe fitting end, and the outer diameter of the ring network is larger than the designed diameter of the outer edge of the pipe fitting end, thereby ensuring that the ring network can be completely wrapped in the pipe fitting end without being exposed. In addition, in this embodiment, see Figure 1 , the ring network includes a number of material passing holes 11 arranged in a circumferential array. On the one hand, through this material passing hole, it is convenient for the liquid material to enter the inner edge surface of the ring network through the material passing hole 11 during injection molding to realize the coating of the inner edge surface of the ring network; on the other hand, after injection molding, the material in the material passing hole can strengthen the connection between the materials on both sides of the ring network and avoid the problem of affecting the combination due to the material difference between the ring network material and the pipe fitting material.

[0028] When the pipe fitting is injection-molded, the inner edge surface of the pipe fitting is formed by relying on the mandrel of the mold. However, in order to achieve the complete coating of the ring network by the pipe fitting material, a certain annular gap needs to be set between the ring network and the mold mandrel, so as to facilitate the filling of injection molding material in this gap, thereby realizing the coating of the inner edge of the ring network. For this reason, in this embodiment, a positioning member is relatively nested and fixed on the inner edge of the ring network. The inner edge diameter of the positioning member is the same as the inner edge diameter of the pipe fitting. Thus, the ring network is sleeved outside the mandrel through the positioning member for injection molding. Since the positioning member has a certain thickness, injection molding can be carried out between the inner edge of the ring network and the mandrel, thereby forming the coating of the inner edge of the ring network. By adjusting the thickness of the positioning member, the amount of material in the melting zone during electromagnetic welding can be adjusted, and then the size of the thermal expansion pressure during welding can be adjusted to ensure the welding strength.

[0029] Specifically, referring to Figure 2 , in this embodiment, the positioning member 2 includes two positioning rings 21 and several positioning ribs 22. Among them, the inner edge diameters of the two positioning rings 21 are respectively the same as the designed inner edge diameter of the pipe fitting, and the outer edge diameters of the two positioning rings 21 are respectively smaller than the designed outer edge diameter of the pipe fitting, so that the two positioning rings 21 can just be clamped at the inner edge of the ring network. In addition, several positioning ribs 22 are connected between the positioning rings 21, and at least two positioning ribs 22 are provided. Referring to Figure 2 , in this example, the positioning ribs 22 are arranged in a circumferential array along the positioning rings 21. The two positioning rings are connected in parallel through the positioning ribs 22. On the one hand, the assembly accuracy after the assembly of the positioning rings 21 can be guaranteed, avoiding affecting the subsequent smooth sleeving on the mold mandrel; on the other hand, the two positioning rings 21 are connected into a whole through the positioning ribs 22, which can improve the assembly convenience.

[0030] However, during the injection molding operation, there is a certain injection pressure in the injection cavity of the mold. In order to avoid the problem that the ring network and the positioning member move relatively or even separate from each other after being subjected to the injection pressure. Referring to Figure 2 , in this embodiment, a limiting shoulder 23 is provided at the end of a positioning ring. The limiting shoulder 23 protrudes a certain length from the outer edge of the positioning ring, and its width matches the thickness of the ring network. Specifically, in this example, the width of the limiting shoulder is the same as the thickness of the ring network. The limiting shoulder and the corresponding positioning ring are an integrally formed structure with an L-shaped cross-section; in some other embodiments, the width of the limiting shoulder is smaller or larger than the thickness of the ring network, and it is ensured that the end face of the ring network contacts and abuts against the limiting shoulder. Thus, it is ensured that after the positioning member or the ring network is subjected to the injection pressure, the limiting is realized by the abutment of the limiting shoulder 23 against the end of the ring network, avoiding relative movement or separation between the positioning member and the ring network.

[0031] In addition, in order to ensure the bonding strength between the positioning member and the pipe fitting after injection molding and to avoid the adverse influence of the positioning member on the welding during electromagnetic welding, in this embodiment, the material of the positioning member is the same as the injection molding material of the pipe fitting, thereby avoiding the adverse influence of material differences on the bonding reliability and welding firmness.

[0032] In some other embodiments, refer to Figure 3 , the cross-section of the limiting shoulder 23 is L-shaped. Thus, a U-shaped limiting groove is formed between the limiting shoulder 23 and the positioning ring 21. In this example, the width of the U-shaped limiting groove matches the thickness of the ring net. Refer to Figure 4 , such that the ring net 1 can just be clamped in the U-shaped limiting groove, thereby realizing the relative fixation of the positions between the ring net and the positioning member during injection molding. In addition, in this example, the outer diameter of the limiting shoulder is smaller than the designed outer diameter of the pipe fitting, thus preventing the limiting shoulder from being exposed on the outer wall of the pipe fitting and affecting the aesthetics and structural strength of the pipe fitting.

[0033] In some other embodiments, refer to Figure 5 , it only includes one positioning ring 21, and each positioning rib 22 is circumferentially arrayed on one side of the positioning ring 21. Similarly, in order to prevent relative movement of positions between the positioning member and the ring net during injection molding, a limiting shoulder is provided at the end of the positioning ring 21.

[0034] In some other embodiments, refer to Figure 6 , it only includes one positioning ring 21, and each positioning rib 22 is circumferentially arrayed on both sides of the positioning ring 21, and the positioning ribs 22 on both sides of the positioning ring 21 are arranged in one-to-one correspondence or staggered. In order to prevent relative movement of positions between the positioning member and the ring net during injection molding, refer to Figure 6 , in this example, a limiting shoulder is provided at the end of one side of the positioning rib 23, and the width of the limiting shoulder matches the thickness of the ring net.

[0035] Although some preferred embodiments of the present application have been described, those skilled in the art can make additional changes and modifications once they learn the basic creative concepts. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications falling within the scope of the present application.

[0036] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of its inventive concept. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. An electromagnetic welding pipe induction insert, characterized in that: It includes a metal ring net wrapped in the end of the pipe and having a plurality of material passing holes in a circumferential array, and a positioning member which is nested and fixed relative to the inner edge of the ring net and whose inner edge diameter is consistent with the inner edge diameter of the pipe; the positioning member includes at least one positioning ring and a plurality of positioning ribs correspondingly connected to the positioning ring.

2. The electromagnetic welding pipe induction insert according to claim 1, characterized in that: It comprises two positioning rings which are connected correspondingly by the positioning ribs.

3. The electromagnetic welding pipe induction insert according to claim 1, characterized in that: It comprises a positioning ring, and the positioning ribs are correspondingly arranged along the circumference of the positioning ring.

4. The electromagnetic welding pipe induction insert according to claim 2 or 3, characterized in that: The corresponding positioning ring or positioning rib is provided with a limiting shoulder for abutting against the end of the ring network.

5. The electromagnetic welding pipe induction insert according to claim 4, characterized in that: The corresponding width of the limiting shoulder matches the thickness of the ring network.

6. The electromagnetic welding pipe induction insert according to claim 4, characterized in that: A U-shaped limiting groove whose width matches the thickness of the ring net is formed between the limiting shoulder and the positioning ring or positioning rib.

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