Electric smelting pipe fitting with inner supporting steel framework
By introducing an internal support steel frame structure into the electric fuse fittings, the low-temperature brittleness, pores and flow marks of pure plastic electric fuse fittings when injection molding under high pressure levels is solved, and higher pressure levels and better product quality are achieved.
Patent Information
- Application Number
- CN202420688371.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-03
- Publication Date
- 2025-04-18
- Estimated Expiration
- 2034-04-03
AI Technical Summary
When pure plastic electrofusion pipe fittings are made of high-voltage grade electrofusion pipe fittings, due to the thick wall thickness, they are prone to low-temperature brittleness, pores and product surface flow patterns during injection molding.
The internal support steel frame electric fuse fitting is adopted. By setting up a steel frame on the inner wall of the injection molded main body, and using a structure with limited position holes and nuts, the positioning screws come into contact with the mold core to achieve stable support of the steel frame.
It effectively avoids the brittleness problem of cold water hydraulic pressure of electric fused pipe fittings, eliminates cracking caused by pipe ring stress, reduces injection molding costs, and improves the quality and connection reliability of electric fused pipe fittings.
Smart Images
Figure CN222772802U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electric fusion pipe fittings, in particular to an electric fusion pipe fitting with an inner supporting steel skeleton. Background Art
[0002] The electric fusion pipe fitting technology is widely used in the field of pipeline welding. Its principle is to implant a heating wire into the inner wall of the socket of the electric fusion pipe fitting, and the electric current provided by the electric fusion welding machine makes the heating wire generate heat, melt the pipe fitting and the pipe and weld them. When pure plastic electric fusion pipe fittings are made into high-pressure grade electric fusion pipe fittings, because the pure plastic electric fusion pipe fittings have thicker walls, during the injection molding process, when testing cold water hydraulic pressure, pure plastic electric fusion pipe fittings are prone to low-temperature brittleness problems. Utility Model Content
[0003] The utility model provides an inner supporting steel skeleton electric fusion pipe fitting, which is used to solve the problem that pure plastic electric fusion pipe fittings are easy to be brittle at low temperature during injection molding because the pure plastic electric fusion pipe fittings have thick walls when being made into high-voltage electric fusion pipe fittings.
[0004] To achieve the above purpose, the technical solution of the utility model is as follows:
[0005] An internally supported steel skeleton electric fusion pipe fitting comprises a steel skeleton and an injection molded body, wherein:
[0006] The steel frame is arranged on the inner wall of the injection molding body, and limiting holes and nuts fixedly connected to the steel frame are arranged at both ends of the steel frame, and the center lines of the limiting holes and the nuts coincide; the nuts are all connected with positioning screws; wherein, one end of the positioning screw is connected to the nut, and the other end of the positioning screw is in contact with the mold core.
[0007] The utility model adopts a steel skeleton to support the electric fusion pipe fittings, which solves the problems of pores and product surface flow lines that are easy to appear when PPR (type III polypropylene, also known as random copolymer polypropylene) and other electric fusion pipe fittings are injected into high-pressure electric fusion pipe fittings. On the other hand, it solves the problem of low-temperature brittleness that is easy to appear when testing cold water hydraulic pressure.
[0008] As a preferred technical solution of the utility model, the steel skeleton is a steel cage steel skeleton, or a steel beam steel skeleton, or a steel tube steel skeleton.
[0009] As a preferred technical solution of the utility model, the injection-molded body is made of a material selected from the group consisting of PPR, PE and PERT.
[0010] As a preferred technical solution of the present invention, the nuts are fixed to the steel frame by welding.
[0011] As a preferred technical solution of the present utility model, the diameter of the limiting hole is larger than the outer diameter of the positioning screw, so as to facilitate the positioning screw to be inserted into the limiting hole.
[0012] As a preferred technical solution of the present utility model, the threaded hole size of the nut is M6 to M12.
[0013] As a preferred technical solution of the utility model, the limiting hole is a through hole, and its size is adapted to the positioning screw.
[0014] As a preferred technical solution of the present utility model, at least three limiting holes are provided at each end of the steel frame.
[0015] As a preferred technical solution of the utility model, the two ends of the injection molding body are respectively provided with a first socket and a second socket for connecting the pipe, and the first socket and the second socket are symmetrically arranged at the two ends of the injection molding body; the inner walls of the first socket and the second socket are both provided with a welding area.
[0016] As a preferred technical solution of the present utility model, the width of the nut of the positioning screw is greater than the width of the limiting hole.
[0017] Compared with the prior art, the beneficial effects of the technical solution of the utility model are:
[0018] Pure plastic electric fusion pipe fittings have low temperature brittleness (cold brittleness) problem when they are made into high pressure grade electric fusion pipe fittings. The utility model adds a steel skeleton inside the electric fusion pipe fittings to avoid the brittleness of the electric fusion pipe fittings during cold water hydraulic pressure. The supporting effect of the steel skeleton can also eliminate the cracking caused by the ring stress of the pipe.
[0019] The utility model adopts a steel skeleton combined with an electric fusion pipe fitting as a composite electric fusion pipe fitting, which can achieve a high pressure level and can also effectively reduce the wall thickness of the electric fusion pipe fitting, solve the problems of pores and product surface flow lines that are prone to occur when the electric fusion pipe fitting is used for injection molding of high-pressure electric fusion pipe fittings, and is conducive to reducing the injection molding cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The drawings are only used for illustrative purposes and should not be construed as limitations on the present invention. In order to better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the drawings.
[0021] Figure 1 This is a schematic diagram of the internal structure of an electric fusion pipe fitting according to an embodiment of the utility model;
[0022] Figure 2 This is a schematic diagram of the structure of a steel frame according to an embodiment of the present utility model;
[0023] Explanation of the reference numerals: 1. steel skeleton; 100. pipe; 2. injection molding body; 200. welding area; 3. positioning screw; 4. nut; 5. limiting hole; 6. contact end between positioning screw and mold core; 7. inner thread position of nut; 8. first socket; 9. second socket; 10. limiting structure. DETAILED DESCRIPTION
[0024] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.
[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0027] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0028] Example 1
[0029] For easier understanding, see Figure 1 and Figure 2 The utility model provides an embodiment of an internal support steel skeleton electric fusion pipe fitting, comprising: a steel skeleton 1 and an injection molded body 2, wherein:
[0030] The steel skeleton 1 is arranged on the inner wall of the injection molding body 2, and the two ends of the steel skeleton 1 are provided with limiting holes 5 and nuts 4 fixedly connected to the steel skeleton 1, and the center lines of the limiting holes 5 and the nuts 4 coincide with each other; the nuts 4 are connected with positioning screws 3; wherein, one end of the positioning screws 3 is connected to the nuts 4, and the other end of the positioning screws 3 is in contact with the mold core.
[0031] The utility model adopts an internal support method to fix a steel frame 1 with limiting holes 5 on the inner wall of the pipe fitting, and two pairs of nuts 4 are fixedly connected to the limiting holes 5. The limiting holes 5 are symmetrically distributed at both ends of the pipe fitting to fix the steel frame 1, and the top end of the positioning screw 3 supports the mold core of the pipe fitting, and the tail of the positioning screw 3 is adjusted according to the situation, and the operation is simple and convenient.
[0032] like Figure 2 The nut 4 is provided with a nut inner thread position 7, and the positioning screw 3 positions the steel frame 1 through the nut inner thread position 7 of the nut 4 fixedly connected to the steel frame 1. The positioning screw 3 can be slightly longer so that the positioning screw 3 can fully reach the mold core. The steel frame 1 is suspended in this way without supporting the outer wall, and the operation is simple and convenient. During injection molding, it is only necessary to fix the steel frame 1 on the mold core, load the mold, and then perform injection molding after closing the mold to obtain an internally supported steel frame electric fusion pipe fitting. Compared with the method of fixing the mold cavity with rubber particles, the utility model can achieve a complete appearance of the electric fusion pipe fitting and precise positioning. The injection molding body 2 is the electric fusion pipe fitting before injection molding.
[0033] The coincidence of the center lines of the limiting hole 5 and the nut 4 can make the positions of the limiting hole 5 and the nut 4 correspond to each other, which is convenient for the threaded connection of the positioning screw 3. After the positioning screw 3 is installed, the contact end 6 of the positioning screw 3 and the mold core is observed to check the contact distance between the positioning screw 3 and the mold core, but the positioning screw 3 and the mold core do not need to be tightened too much to avoid difficulty in pulling out the mold core after injection molding.
[0034] In the utility model, a steel frame 1 is added in the electric fusion pipe fitting to bear the pressure of water accumulated in the electric fusion pipe material, thereby enhancing the bearing pressure of the electric fusion pipe fitting.
[0035] The utility model adds a steel skeleton 1 in the electric fusion pipe fitting to avoid the brittleness of the electric fusion pipe fitting during cold water hydraulic pressure, and the supporting function of the steel skeleton can also eliminate the cracking caused by the ring stress of the pipe material. It can also be used to solve the problems of pure plastic electric fusion pipe fittings being easy to have pores and product surface flow lines during injection molding due to the thick wall thickness of pure plastic electric fusion pipe fittings when making high-pressure grade electric fusion pipe fittings, thereby improving the quality of electric fusion pipe fittings and thus improving the reliability of pipeline system connection.
[0036] Example 2
[0037] The solution in Example 1 is further introduced below in combination with a specific working method, as described below:
[0038] like Figure 1 As shown, as a preferred embodiment, on the basis of the above-mentioned method, further, the steel skeleton 1 is a steel cage steel skeleton, or a steel beam steel skeleton, or a steel cylinder steel skeleton, which improves the overall structural strength of the steel skeleton 1. Specifically, the steel skeleton 1 provided by the utility model can also be a copper column, so that the structure of the steel skeleton is more stable, strong and durable.
[0039] like Figure 1 As shown, as a preferred implementation, on the basis of the above-mentioned method, further, the injection molding body 2 is made of one of the materials selected from PPR, PE, and PERT.
[0040] The injection molding body 2 is not limited to PPR (type III polypropylene, also known as random copolymer polypropylene) electric fusion pipe fittings. Other fusion materials, such as PE polyethylene materials, PE RT (heat-resistant polyethylene), etc. can all use the technical solution of the utility model, which is low in cost. Therefore, the utility model has good practicality.
[0041] like Figure 1 As shown, as a preferred embodiment, on the basis of the above-mentioned method, further, the nuts 4 are fixed on the steel skeleton 1 by welding.
[0042] like Figure 1 As shown, as a preferred embodiment, on the basis of the above method, further, the aperture of the limiting hole 5 is larger than the outer diameter of the positioning screw 3, so that the positioning screw 3 is easily inserted into the limiting hole 5, so that the connection between the positioning screw 3 and the steel frame 1 is more secure.
[0043] The limiting hole 5 can also be a threaded hole, so that the positioning screw 3 and the steel frame 1 are threadedly connected.
[0044] like Figure 1 As shown, as a preferred implementation, based on the above implementation, further, the threaded hole size of the nut 4 is M6 to M12.
[0045] like Figure 1 As shown, as a preferred implementation, on the basis of the above-mentioned implementation, further, the limiting hole 5 is a through hole, and its size is adapted to the positioning screw 3 .
[0046] like Figure 1 As shown, as a preferred embodiment, on the basis of the above method, further, at least three limiting holes 5 are provided at each end of the steel frame 1, so as to facilitate a more stable connection between the steel frame 1 and the positioning screws 3. At the same time, the limiting holes 5 can be evenly distributed along the periphery of the steel frame 1, so that the mold core is centered when placed in the steel frame 1, thereby improving the overall stability of the mold core placement.
[0047] The width of the nut of the positioning screw 3 is greater than the width of the limiting hole 5 , so that the positioning screw 3 is not easy to fall out of the limiting hole 5 .
[0048] Compared with the existing method of fixing the steel frame 1 in the mold cavity with rubber particles, the utility model adopts the method of supporting the inner wall of the mold core with metal positioning screws 3, which is more stable, easy to operate and easy to produce. The utility model is more precise in structure than the rubber particle support mold cavity positioning, and the appearance of the sample after injection molding is intact without any trace of rubber particles.
[0049] The welding nut 4 of the utility model is on the steel frame 1, and the positioning screw 3 is more easily installed and adjusted through the nut 4 during the positioning process, which is convenient for mass production and processing.
[0050] Example 3
[0051] The schemes in Example 1 and Example 2 are further introduced below in combination with specific working methods, as described below for details:
[0052] like Figure 1 As shown, as a preferred embodiment, on the basis of the above-mentioned manner, further, the two ends of the injection molding body 2 are respectively provided with a first socket 8 and a second socket 9 for connecting the pipe 100, and the first socket 8 and the second socket 9 are symmetrically arranged at the two ends of the injection molding body 2; the inner walls of the first socket 8 and the second socket 9 are both provided with a welding zone 200. The welding zone 200 may include a plurality of mutually spaced melting zones or continuously distributed melting zones.
[0053] like Figure 1As shown, as a preferred embodiment, on the basis of the above-mentioned method, further, a limiting structure 10 is provided between the first socket 8 and the second socket 9. The limiting structure 10 is a limiting structure in the middle of the inner wall of the injection molding body 1, that is, the first socket 8 and the second socket 9 are symmetrically arranged on both sides of the limiting structure 10, and the structure of the welding area 200 on the second socket 9 is the same as that of the first socket 8 and is symmetrical about the plane where the limiting structure 2 is located. The limiting structure 10 can be an annular protrusion, which plays a role in limiting the insertion amount of the pipes at both ends during the application of the utility model, and ensures the electric welding melting effect of the utility model.
[0054] It should be noted that the production process of the utility model steel skeleton electric fusion pipe fittings is as follows: first wrap the rubber heating wire around the mold core according to the designed size parameters, and then put the steel skeleton 1 into the mold core of the production mold, and use the limit holes 5 and positioning screws 3 on both sides of the steel skeleton 1 to position and fix the steel skeleton 1, so that a corresponding gap is retained between the steel skeleton 1 and the mold core, and the gap is used for injection molding, and then the mold core and the steel skeleton 1 are put into the mold cavity together, and after installation, injection molding is performed to complete the blank. After the injection molding is completed, according to the different specifications of the electric fusion pipe fittings, it is necessary to cool down for a corresponding time (the purpose is to control the size of the fusion zone 200 of the electric fusion pipe fittings - that is, the size of the socket part) and then remove the mold core to complete the production of the electric fusion pipe fitting blank.
[0055] The utility model has the following beneficial effects:
[0056] Conventional steel skeleton electric fusion adopts adding plastic columns to the material holes of the steel hanger to support the outer wall of the product in the mold cavity. On the one hand, this method will cause a lot of hot and cold material welding problems. On the other hand, adding plastic columns to the product material holes during injection molding will cause shrinkage holes and other problems. At the same time, the appearance of the product made by this method has potholes and is not beautiful. However, the utility model adopts a steel skeleton 1 to support the inner wall, which does not have the problems of hot and cold material welding and shrinkage holes, because the steel skeleton 1 is at the inlet of the socket and will not contact the medium transmitted by the pipeline system. Therefore, this method is safe and reliable, efficient, easy to operate, and the product surface is beautiful. The product uses a steel skeleton 1 as the composite layer of the electric fusion pipe fittings, and adds a steel skeleton 1 with punching holes in the middle part of the electric fusion pipe fittings such as PPR to increase the pressure level and meet the pressure requirements of S2 level.
[0057] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the protection scope of the claims of the utility model.
Claims
1. An internal support steel skeleton electric fusion pipe fitting, characterized in that: It comprises a steel frame (1) and an injection-molded body (2), wherein: The steel frame (1) is arranged on the inner wall of the injection molding body (2), and the two ends of the steel frame (1) are provided with limiting holes (5) and nuts (4) fixedly connected to the steel frame (1), and the center lines of the limiting holes (5) and the nuts (4) coincide with each other; the nuts (4) are connected with positioning screws (3); wherein one end of the positioning screws (3) is connected to the nuts (4), and the other end of the positioning screws (3) is in contact with the mold core.
2. The inner support steel skeleton electric fusion pipe fitting according to claim 1 is characterized in that: The steel frame (1) is a steel cage steel frame, or a steel beam steel frame, or a steel tube steel frame.
3. The inner support steel skeleton electric fusion pipe fitting according to claim 1, characterized in that: The injection-molded body (2) is made of a material selected from the group consisting of PPR, PE and PERT.
4. The inner support steel skeleton electric fusion pipe fitting according to claim 1, characterized in that: The nuts (4) are fixed on the steel frame (1) by welding.
5. The inner support steel skeleton electric fusion pipe fitting according to claim 1, characterized in that: The threaded hole size of the nut (4) is M6-M12.
6. The inner support steel skeleton electric fusion pipe fitting according to claim 1, characterized in that: The diameter of the limiting hole (5) is larger than the outer diameter of the positioning screw (3).
7. The inner support steel skeleton electric fusion pipe fitting according to claim 1, characterized in that: The limiting hole (5) is a through hole.
8. The inner support steel skeleton electric fusion pipe fitting according to claim 1, characterized in that: At least three limiting holes (5) are provided at each end of the steel frame (1).
9. The inner support steel skeleton electric fusion pipe fitting according to claim 1, characterized in that: The two ends of the injection molding body (2) are respectively provided with a first socket (8) and a second socket (9) for connecting a pipe (100); the first socket (8) and the second socket (9) are symmetrically arranged at the two ends of the injection molding body (2); the inner walls of the first socket (8) and the second socket (9) are both provided with a welding area (200).
10. An internal support steel skeleton electric fusion pipe fitting according to any one of claims 1 to 9, characterized in that: The width of the nut of the positioning screw (3) is greater than the width of the limiting hole (5).