Electric smelting different-diameter connecting pipe fitting

Abstract

The utility model discloses an electric smelting different-diameter connecting pipe fitting which comprises a large-caliber sleeve, a small-caliber sleeve and an annular lock catch. The inner side ends of the large-caliber casing pipe and the small-caliber casing pipe are in nested butt joint through the positioning blocks and the positioning grooves, and the annular lock catches are in threaded connection and fixation. The large-diameter sleeve is provided with a standard section A, a conical section A, a large-opening section and a containing section A. The small-diameter sleeve is provided with a standard section B, a conical section B, a small-opening section and a containing section B. The gradient of the conical section is smaller than or equal to 15 degrees, arc transition is adopted, and it is guaranteed that fluid stably passes through the conical section. Heating wires are arranged in the containing sections A and B and used for conducting electric fusion welding on the corresponding pipes, and the inner walls are flush. Sealing rubber rings are arranged at the joints to enhance the sealing performance, and a peripheral reinforcing structure improves the structural strength. The utility model has the advantages of modular combination, strong generality, stable connection, reliable sealing and the like, and is suitable for the fields of water supply and drainage, gas delivery, chemical pipelines and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electrically fused pipe fittings, and particularly to a capacitor variable-diameter connecting pipe fitting. BACKGROUND

[0002] In a piping system, due to fluid transportation requirements or space layout restrictions, it is often necessary to connect pipe materials of different diameters. Traditional variable-diameter pipe fittings usually use mechanical connection, flange butt joint or welding to realize variable-diameter transition, but these methods have problems such as complex installation, insufficient sealing or low connection strength. Especially in the connection of polyethylene (PE), polypropylene (PP) and other thermoplastic plastic pipes, mechanical connection is prone to sealing failure due to material creep, and ordinary welding process has high requirements on operation technology and is difficult to ensure the smoothness of the flow channel at the variable-diameter interface.

[0003] At present, electrically fused connection technology has gradually become the mainstream way of connecting plastic pipes due to its high efficiency and reliability. Existing electrically fused variable-diameter pipe fittings usually adopt a socket type structure, which melts the contact surface of the pipe material and the pipe fitting by built-in heating wires to realize welding. However, such pipe fittings have the following limitations in design:

[0004] 1. Poor versatility: Traditional electrically fused variable-diameter pipe fittings are mostly fixed size combinations, which cannot flexibly adapt to various pipe diameter requirements, resulting in the need to stock a large number of types in engineering, increasing cost and management difficulty.

[0005] 2. Poor fluid performance: If the variable-diameter transition zone is designed unreasonably (such as too large a taper angle or a non-smooth transition), it is easy to cause problems such as turbulence and increased pressure loss, affecting transportation efficiency.

[0006] 3. Insufficient connection stability: The existing pipe fittings lack effective positioning and anti-torsion structures for the butt joint of large-diameter and small-diameter pipe sections, which may cause interface loosening or leakage due to stress concentration during long-term use.

[0007] 4. Defects in welding uniformity: The heating wires of some electrically fused pipe fittings are unevenly distributed, which can easily cause local overheating or insufficient welding, reducing the connection strength. SUMMARY

[0008] In view of the above deficiencies in the prior art, the utility model aims to provide an electrically fused variable-diameter connecting pipe fitting that can flexibly combine multiple specifications of pipe materials, optimize the flow channel design, enhance the structural stability, and improve the uniformity and reliability of electrically fused welding.

[0009] The utility model discloses a technology scheme adopted for realizing the above-mentioned purpose is: a kind of electrically fused different-diameter connecting pipe fitting, including large-diameter sleeve pipe, small-diameter sleeve pipe, annular lock catch, the inside tube of large-diameter sleeve pipe, small-diameter sleeve pipe keeps nested butt joint, the annular lock catch is set to the periphery of large-diameter sleeve pipe and with the inside outer wall of small-diameter sleeve pipe keeps screw joint.

[0010] The inner cavity of the large-diameter sleeve pipe is sequentially provided with a standard section A, a tapered section A, a large-diameter section, and a containing section A from inside to outside, the inner diameter of the standard section A is smaller than that of the large-diameter section, the connection between the two ends of the tapered section A and the standard section A and the large-diameter section is arc-shaped, the inner diameter of the containing section A is larger than that of the large-diameter section, the containing section A is used for electrically fused welding of the large-diameter pipe, and the inner diameter of the large-diameter pipe is equal to that of the large-diameter section.

[0011] The inner cavity of the small-diameter sleeve pipe is sequentially provided with a standard section B, a tapered section B, a small-diameter section, and a containing section B from inside to outside, the inner diameter of the standard section B is larger than that of the small-diameter section, the inner diameter of the standard section A is equal to that of the standard section B, the connection between the two ends of the tapered section B and the standard section B and the small-diameter section is arc-shaped, the inner diameter of the containing section B is larger than that of the small-diameter section, the containing section B is used for electrically fused welding of the small-diameter pipe, and the inner diameter of the small-diameter pipe is equal to that of the small-diameter section.

[0012] On the basis of the above technical scheme, in order to ensure that the inside ends of the large-diameter sleeve pipe and the small-diameter sleeve pipe realize accurate butt joint, the following technical scheme is provided.

[0013] The inside end of the small-diameter sleeve pipe is fixedly connected with a connecting sleeve extending towards one side of the large-diameter sleeve pipe, the inner wall of the connecting sleeve is fixedly connected with a plurality of positioning blocks arranged in a ring array, the inside end of the large-diameter sleeve pipe is provided with a plurality of positioning grooves arranged in a ring array, and the positioning grooves and the positioning blocks are nested and connected.

[0014] On the basis of the above technical scheme, in order to ensure the sealing effect of the inside ends of the large-diameter sleeve pipe and the small-diameter sleeve pipe after being connected, the following technical scheme is provided.

[0015] The inside end surface of the large-diameter sleeve pipe is provided with a ring-shaped recess A, the inside end surface of the small-diameter sleeve pipe is provided with a ring-shaped recess B, and the ring-shaped recess A and the ring-shaped recess B are filled with a sealing rubber ring.

[0016] On the basis of the above technical scheme, in order to ensure that the annular lock catch can be effectively set on the outer wall of the large-diameter sleeve pipe and effectively fix the large-diameter sleeve pipe and the small-diameter sleeve pipe, the following technical scheme is provided.

[0017] The outer wall of the large-diameter sleeve is fixedly connected with a positioning ring which is in close contact with the connecting sleeve, the annular lock catch is in abutment with the positioning ring, the outer wall of the connecting sleeve is provided with external threads, and the inner wall of the annular lock catch is provided with internal threads matched with the external threads.

[0018] The outer wall of the annular lock catch is fixedly connected with a hexagonal seat A, and the outer wall of the small-diameter sleeve is fixedly connected with a hexagonal seat B.

[0019] On the basis of the above technical scheme, in order to ensure the structural strength of the accommodating sections A and B corresponding to the large-diameter sleeve and the small-diameter sleeve, and to ensure the effective connection of the connected pipe material, the following technical scheme is provided.

[0020] The outer side end of the large-diameter sleeve and the small-diameter sleeve is embedded with a corresponding size of a reinforcing structure, the reinforcing structure is arranged at the periphery of the accommodating section A or the accommodating section B, and the reinforcing structure comprises a plurality of groups of annular reinforcing ribs arranged concentrically and longitudinal reinforcing ribs arranged in an annular array for connecting each group of annular reinforcing ribs.

[0021] On the basis of the above technical scheme, in order to ensure the structural strength of the accommodating sections A and B corresponding to the large-diameter sleeve and the small-diameter sleeve, and to ensure the effective connection of the connected pipe material, the following technical scheme is provided.

[0022] The outer side end of the large-diameter sleeve and the small-diameter sleeve is embedded with a corresponding size of a reinforcing structure, the reinforcing structure is arranged at the periphery of the accommodating section A or the accommodating section B, and the reinforcing structure comprises a plurality of groups of annular reinforcing ribs arranged concentrically and longitudinal reinforcing ribs arranged in an annular array for connecting each group of annular reinforcing ribs.

[0023] The utility model discloses the beneficial effect:

[0024] 1. High universality and modular design, by the large-diameter sleeve and small-diameter sleeve design as the modular combination of standard section (A / B), taper section (A / B) and accommodating section (A / B), make the same specification standard section can adapt to multiple different sizes of large section and small section, realize the flexible butt joint of any two groups of pipe diameter, greatly reduce the pipe type needed in engineering, reduce the inventory and management cost, improve construction efficiency.

[0025] 2. Optimized fluid transition performance, the slope of taper section (A / B) is controlled within 15°, and is smoothly transitioned through arc, effectively reduces the turbulence and pressure loss of fluid in the variable diameter area, ensures the flow stability. The inner diameter of large section and small section is consistent with the connected pipe material, and the pipe wall keeps flush after the accommodating section is welded, avoids the flow resistance increase caused by the inner wall protrusion or depression.

[0026] 3. High-precision positioning and anti-torsion structure, using the nested plug-in design of positioning blocks and positioning grooves to ensure the accurate alignment of large-diameter sleeves and small-diameter sleeves, prevent misalignment or deflection, the threaded fastening of the connecting sleeve and the annular lock catch, combined with the abutting structure of the positioning ring, enhances the overall anti-torsion capability, avoids loosening or leakage after long-term use.

[0027] 4. Reliable sealing performance, through the double sealing design of annular grooves (A / B) and sealing rubber rings, effectively preventing leakage at the connection, especially suitable for high-pressure or corrosive fluid conveying scenarios.

[0028] 5. Enhanced structural strength and welding quality, the peripheral of the accommodating section is provided with annular reinforcing ribs and longitudinal reinforcing ribs, which significantly improves the structural strength of the welding area, prevents deformation or cracking of the pipe during electric melting, the heating wire adopts continuous S-shaped arrangement to ensure uniform heating of the accommodating section, avoid local overheating or insufficient welding, improve welding reliability and joint life.

[0029] 6. Convenient construction and maintenance, hexagonal seat (A / B) design facilitates tightening of annular lock catch with wrench or pipe wrench, simplifies installation process, standardized design of terminal block (A / B) facilitates quick connection with electric melting welding machine, improves construction efficiency.

[0030] In summary, the present application not only improves the adaptability and fluid performance of the reducing pipe fitting, but also enhances the connection stability and sealing performance through optimized structural design, which can be widely used in water supply and drainage, gas transportation, chemical pipeline and other fields, has significant economic benefits and engineering practical value. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a structural schematic diagram of the combination of various components of the utility model;

[0032] Figure 2 is Figure 1 is a structural schematic diagram in a cut state;

[0033] Figure 3 is a structural schematic diagram of a small-diameter sleeve;

[0034] Figure 4 is a structural schematic diagram of a large-diameter sleeve;

[0035] Figure 5 is a structural schematic diagram of a reinforcing structure;

[0036] Figure 6 is a structural schematic diagram of an electric heating wire.

[0037] In the figure: 1 large-diameter sleeve, 101 standard section A, 102 tapered section A, 103 large-diameter section, 104 accommodation section A, 105 positioning groove, 106 annular sink A, 107 terminal block A, 108 positioning ring, 2 small-diameter sleeve, 201 standard section B, 202 tapered section B, 203 small-diameter section, 204 accommodation section B, 205 connecting sleeve, 206 positioning block, 207 annular sink B, 208 hexagonal seat B, 209 terminal block B, 3 annular lock, 31 hexagonal seat A, 4 sealing rubber ring, 51 annular reinforcing rib, 52 longitudinal reinforcing rib, 6 heating wire. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model.

[0039] Please refer to Figures 1-6 An electrically fused variable-diameter connecting pipe fitting, comprising a large-diameter sleeve 1, a small-diameter sleeve 2 and an annular lock 3, the inner sides of the large-diameter sleeve 1 and the small-diameter sleeve 2 are kept nested and connected, and the annular lock 3 is sleeved to the periphery of the large-diameter sleeve 1 and is kept screwed with the inner side of the small-diameter sleeve 2.

[0040] The inner cavity of the large-diameter sleeve 1 is sequentially provided with a standard section A 101, a tapered section A 102, a large-diameter section 103 and an accommodation section A 104 from inside to outside, the inner diameter of the standard section A 101 is smaller than that of the large-diameter section 103, the connection between the two ends of the tapered section A 102 and the standard section A 101 and the large-diameter section 103 is arc-shaped, the inner diameter of the accommodation section A 104 is larger than that of the large-diameter section 103, the accommodation section A 104 is used for electrically fusing a large-diameter pipe material, and the inner diameter of the large-diameter pipe material is equal to that of the large-diameter section 103.

[0041] The inner cavity of the small-diameter sleeve 2 is sequentially provided with a standard section B 201, a tapered section B 202, a small-diameter section 203 and an accommodation section B 204 from inside to outside, the inner diameter of the standard section B 201 is larger than that of the small-diameter section 203, the inner diameter of the standard section A 101 is equal to that of the standard section B 201, the connection between the two ends of the tapered section B 202 and the standard section B 201 and the small-diameter section 203 is arc-shaped, the inner diameter of the accommodation section B 204 is larger than that of the small-diameter section 203, the accommodation section B 204 is used for electrically fusing a small-diameter pipe material, and the inner diameter of the small-diameter pipe material is equal to that of the small-diameter section 203.

[0042] For the standard section A101 and the standard section B201, the inner diameter size is usually a standard size to ensure that the inner ends of different models of large-diameter sleeves 1 and small-diameter sleeves 2 can be precisely connected. For different models of large-diameter sleeves 1 and small-diameter sleeves 2, the large-section 103 and the small-section 203 can be designed in multiple different size types, so the corresponding tapered sections A102 and B202 have different forms when meeting the smooth transition with the corresponding large-section 103 and small-section 203, and the overall slope of the tapered sections A102 and B202 needs to be maintained within 15°, and through the arc transition, the generation of local turbulence can be effectively avoided.

[0043] The organic combination of each type of large-diameter sleeve 1 and small-diameter sleeve 2 manufactured according to the above design requirements can realize the connection combination of any two groups of inner diameter pipes, and has strong universality and applicability.

[0044] The design of the accommodation section A104 and the accommodation section B204 can ensure that the corresponding pipe materials of the welded combination are flush with the inner walls of the large-section 103 and the small-section 203, thereby ensuring the stability of the fluid passing through.

[0045] To ensure that the inner ends of the large-diameter sleeve 1 and the small-diameter sleeve 2 are precisely connected, the following technical solutions are provided.

[0046] The inner end of the small-diameter sleeve 2 is fixedly connected with a connecting sleeve 205 extending towards the side of the large-diameter sleeve 1, the inner wall of the connecting sleeve 205 is fixedly connected with a plurality of positioning blocks 206 arranged in a ring array, and the inner end of the large-diameter sleeve 1 is provided with a plurality of positioning grooves 105 arranged in a ring array, and the positioning grooves 105 and the positioning blocks 206 are nested and connected.

[0047] After the large-diameter sleeve 1 and the small-diameter sleeve 2 are combined by the nested connection of the positioning blocks 206 and the positioning grooves 105, the inner end faces of the two are kept in contact, and the inner end of the large-diameter sleeve 1 is arranged inside the connecting sleeve 205. The combination of the positioning blocks 206 and the positioning grooves 105 can also effectively prevent the small-diameter sleeve 2 from rotating relative to the large-diameter sleeve 1, thereby improving the overall stability of the combination.

[0048] To ensure the sealing effect of the inner ends of the large-diameter sleeve 1 and the small-diameter sleeve 2 after the nested connection, the following technical solutions are provided.

[0049] A ring-shaped recess A106 is formed on the inner end face of the large-diameter sleeve 1, and a ring-shaped recess B207 is formed on the inner end face of the small-diameter sleeve 2, and a sealing rubber ring 4 is filled in the ring-shaped recess A106 and the ring-shaped recess B207.

[0050] The annular groove A106 and the annular groove B207 are in a coaxial opposing position, with the same inner and outer diameters, which can ensure that the sealing ring 4 is stably assembled in a compressed position. By adding the sealing ring 4, the sealing effect at the connection between the small diameter sleeve 2 and the large diameter sleeve 1 can be achieved.

[0051] To ensure that the annular locking buckle 3 can be effectively fitted onto the outer wall of the large-diameter sleeve 1 and to effectively fix the large-diameter sleeve 1 and the small-diameter sleeve 2, the following technical solution is provided.

[0052] The outer wall of the large-diameter sleeve 1 is fixed with a positioning ring 108 that fits against the connecting sleeve 205. The annular lock 3 abuts against the positioning ring 108. The outer wall of the connecting sleeve 205 is provided with an external thread, and the inner wall of the annular lock 3 is provided with an internal thread that matches the external thread.

[0053] The annular locking buckle 3 is screwed and fixed to the external thread on the connecting sleeve 205 through its internal thread, thereby positioning the positioning ring 108 between the annular locking buckle 3 and the connecting sleeve 205, thus achieving effective fixation of the large-diameter sleeve 1 and the small-diameter sleeve 2.

[0054] The outer wall of the ring lock 3 is fixedly connected to a hexagonal seat A31, and the outer wall of the small diameter sleeve 2 is fixedly connected to a hexagonal seat B208.

[0055] The hexagonal base A31 and hexagonal base B208 are designed to be easily clamped with a wrench or pipe wrench, thereby ensuring the effective screwing of the annular locking 3-way connecting sleeve 205.

[0056] To ensure the structural strength of the receiving sections A104 and B204 corresponding to the large-diameter sleeve 1 and the small-diameter sleeve 2, and to guarantee the effective connection of the pipes, the following technical solution is provided.

[0057] Both the outer ends of the large-diameter sleeve 1 and the small-diameter sleeve 2 are equipped with reinforcing structures of corresponding dimensions. The reinforcing structures are arranged around the accommodating section A104 or the accommodating section B204. The reinforcing structures include multiple sets of concentrically distributed annular reinforcing ribs 51 and longitudinal reinforcing ribs 52 for connecting the annular reinforcing ribs 51 and arranged in a ring array.

[0058] The sleeve structure formed by the combination of the annular reinforcing rib 51 and the longitudinal reinforcing rib 52 can provide stable support for the accommodating section A104 and the accommodating section B204, thereby improving their structural strength and ensuring the structural strength and welding quality of the pipe during electrofusion welding.

[0059] To ensure uniform heating of the receiving sections A104 and B204 corresponding to the large-diameter sleeve 1 and the small-diameter sleeve 2, and to achieve effective welding of the corresponding pipes, the following technical solution is provided.

[0060] The outer end of the large-diameter sleeve 1 and the small-diameter sleeve 2 is embedded with a heating wire 6 of corresponding size, which is arranged in a continuous S shape at the periphery of the accommodating section A104 or the accommodating section B204, and is arranged inside the reinforcing structure; the outer wall of the large-diameter sleeve 1 and the small-diameter sleeve 2 is fixedly connected with a terminal block A107 and a terminal block B209 respectively, and the two ends of the heating wire 6 are led out to the position of the terminal block A107 or the terminal block B209.

[0061] The heating wire 6 is arranged in a continuous S shape, which can uniformly heat and soften the accommodating section A104 or the accommodating section B204, so as to realize the electrofusion welding of the accommodating section A104, the accommodating section B204 and the corresponding pipe material. The two ends of the heating wire are led out through the terminal block A107 and the terminal block B209, which facilitates the connection of the heating wire with the power supply or the electrofusion welding equipment.

[0062] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0063] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. An electrofusion reducing pipe fitting, characterized in that: Includes a large-diameter sleeve (1), a small-diameter sleeve (2), and an annular lock (3). The inner tubes of the large-diameter sleeve (1) and the small-diameter sleeve (2) are nested and connected. The annular lock (3) is sleeved to the periphery of the large-diameter sleeve (1) and is screwed to the inner outer wall of the small-diameter sleeve (2). The inner cavity of the large-diameter sleeve (1) is provided with a standard section A (101), a tapered section A (102), a large-diameter section (103), and a receiving section A (104) in sequence from the inside to the outside. The inner diameter of the standard section A (101) is smaller than the inner diameter of the large-diameter section (103). The two ends of the tapered section A (102) are connected to the standard section A (101) and the large-diameter section (103) in an arc shape. The inner diameter of the receiving section A (104) is larger than the inner diameter of the large-diameter section (103). The receiving section A (104) is used for electrofusion welding of large-diameter pipes, and the inner diameter of the large-diameter pipe is equal to the inner diameter of the large-diameter section (103). The inner cavity of the small-diameter sleeve (2) is provided with a standard section B (201), a tapered section B (202), a small-diameter section (203), and a receiving section B (204) in sequence from the inside to the outside. The inner diameter of the standard section B (201) is larger than the inner diameter of the small-diameter section (203). The inner diameter of the standard section A (101) is equal to the inner diameter of the standard section B (201). The two ends of the tapered section B (202) are connected to the standard section B (201) and the small-diameter section (203) in an arc shape. The inner diameter of the receiving section B (204) is larger than the inner diameter of the small-diameter section (203). The receiving section B (204) is used for electrofusion welding of small-diameter pipes, and the inner diameter of the small-diameter pipe is equal to the inner diameter of the small-diameter section (203).

2. The electrofusion reducing pipe fitting according to claim 1, characterized in that: The inner end of the small-diameter sleeve (2) is fixedly connected to a connecting sleeve (205) extending toward the side of the large-diameter sleeve (1). The inner wall of the connecting sleeve (205) is fixedly connected to a plurality of positioning blocks (206) arranged in a ring array. The inner end of the large-diameter sleeve (1) is provided with a plurality of positioning grooves (105) arranged in a ring array. The positioning grooves (105) and the positioning blocks (206) are nested and inserted together.

3. The electrofusion reducing pipe fitting according to claim 2, characterized in that: An annular groove A (106) is provided on the inner end face of the large-diameter sleeve (1), and an annular groove B (207) is provided on the inner cross-sectional area of ​​the small-diameter sleeve (2). The annular groove A (106) and the annular groove B (207) are filled with sealing rubber rings (4).

4. The electrofusion reducing pipe fitting according to claim 2, characterized in that: The outer wall of the large-diameter sleeve (1) is fixed with a positioning ring (108) that fits against the connecting sleeve (205). The annular lock (3) abuts against the positioning ring (108). The outer wall of the connecting sleeve (205) is provided with an external thread, and the inner wall of the annular lock (3) is provided with an internal thread that matches the external thread. The outer wall of the annular lock (3) is fixedly connected to a hexagonal seat A (31), and the outer wall of the small diameter sleeve (2) is fixedly connected to a hexagonal seat B (208).

5. The electrofusion reducing pipe fitting according to claim 1, characterized in that: The outer ends of the large-diameter sleeve (1) and the small-diameter sleeve (2) are each provided with a reinforcing structure of corresponding size. The reinforcing structure is arranged around the accommodating section A (104) or the accommodating section B (204). The reinforcing structure includes multiple sets of concentrically distributed annular reinforcing ribs (51) and longitudinal reinforcing ribs (52) for connecting each set of annular reinforcing ribs (51) and arranged in an annular array.

6. The electrofusion reducing pipe fitting according to claim 5, characterized in that: Heating wires (6) of corresponding sizes are embedded at the outer ends of the large-diameter sleeve (1) and the small-diameter sleeve (2). The heating wires (6) are arranged in a continuous S-shape around the periphery of the receiving section A (104) or the receiving section B (204). The heating wires (6) are arranged inside the reinforcing structure. The outer walls of the large-diameter sleeve (1) and the small-diameter sleeve (2) are respectively fixed with terminal blocks A (107) and B (209). The two ends of the heating wires (6) are led out to the positions of terminal blocks A (107) or B (209).

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