Extrusion forming connecting pipe fitting

Abstract

The utility model discloses an extrusion forming connecting pipe fitting which comprises a pipe fitting body used for communicating pipes, the pipe fitting body is composed of an insertion fixing part and a pipeline part, and a first annular groove used for containing a C-shaped ring and a second annular groove used for containing a sealing ring are formed in the insertion fixing part; a transition connecting part is formed between the inserting fixing part and the pipeline part, the end, close to the inserting fixing part, of the transition connecting part is a wide-opening end, the end, close to the pipeline part, of the transition connecting part is a narrow-opening end, and the inner diameter of the wide-opening end is larger than that of the narrow-opening end. The connecting pipe is formed through extrusion, the machining and production cost is low, and the production efficiency is high; meanwhile, the first annular groove and the second annular groove are formed in the insertion fixing part, and the C-shaped ring and the sealing ring are placed in the first annular groove and the second annular groove respectively, so that the sealing ring can be effectively prevented from being damaged when the pipe is inserted; meanwhile, the C-shaped ring and the sealing ring are arranged in the two grooves respectively, if water leakage occurs, the second annular groove can be extruded to improve the compression ratio of the sealing ring to achieve leakage stopping, and the maintenance cost is low.

Description

Technical Field

[0001] The utility model relates to the field of pipe materials, and particularly relates to an extrusion-molded connecting pipe fitting. Background Art

[0002] The plug-in pipe fitting is a common pipe connection method. The plug-in pipe fitting does not require welding, is easy and quick to install, and can reduce construction time and labor costs. The plug-in pipe fitting is applicable to the connection of pipes with different materials and specifications and has strong versatility. It is usually equipped with a sealing ring or gasket, which can provide good sealing performance to prevent water leakage and leakage.

[0003] However, the production cost of the existing plug-in pipe fitting with a multi-groove structure is relatively high; when installing a single-groove plug-in pipe fitting, since the sealing ring is closely attached to the C-ring, the sealing ring is easily damaged; if water leakage occurs, it cannot be quickly repaired and only the connecting pipe can be replaced. Summary of the Utility Model

[0004] Aiming at the above problems, the utility model aims to provide an extrusion-molded connecting pipe fitting that is easy to produce and maintain daily.

[0005] To achieve the technical purpose, the solution of the utility model is: an extrusion-molded connecting pipe fitting, including a pipe fitting body for communicating pipes, the pipe fitting body is composed of at least one plug-in fixing part and a pipe part, and a first annular groove for accommodating a C-ring and a second annular groove for accommodating a sealing ring are formed on the plug-in fixing part;

[0006] A transition connecting part is formed between the plug-in fixing part and the pipe part. One end of the transition connecting part close to the plug-in fixing part is a wide-mouth end, and one end of the transition connecting part close to the pipe part is a narrow-mouth end. The inner diameter of the wide-mouth end is greater than the inner diameter of the narrow-mouth end.

[0007] Preferably, the first annular groove is composed of a gradually expanding tightening part and a gradually narrowing blocking part, and the length of the tightening part is greater than the length of the blocking part.

[0008] Preferably, the diameter of the cross-section of the sealing ring is greater than the diameter of the cross-section of the C-ring, and the maximum inner diameter of the second annular groove is greater than the maximum inner diameter of the tightening part.

[0009] Preferably, the pipe fitting body is one of a straight-through structure, a tee structure, a transition joint structure, or an elbow structure.

[0010] Preferably, the maximum inner diameter of the tightening part is greater than the sum of the outer diameter of the pipe and twice the diameter of the cross-section of the C-ring.

[0011] Preferably, a support ring is further placed in the first annular groove. The support ring is closely attached to the rear side of the C-ring, and the support ring and the C-ring are closely attached together and placed in the first annular groove.

[0012] The beneficial effects of the present utility model are as follows. The connecting pipe of this application is formed by extrusion, with low processing production cost and high production efficiency. At the same time, two grooves, namely the first annular groove and the second annular groove, are formed in the insertion fixing part, and the C-ring and the sealing ring are respectively placed in them, which can effectively avoid damaging the sealing ring when the pipe is inserted. Meanwhile, since the C-ring and the sealing ring are respectively placed in two grooves, if there is a water leakage situation, the second annular groove can be extruded to increase the compression ratio of the sealing ring to achieve leak stoppage, with low maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic structural diagram of the straight-through of the present utility model;

[0014] Figure 2 It is a schematic structural diagram of the tee of the present utility model;

[0015] Figure 3 It is a partial structural diagram of the tee of the present utility model;

[0016] Figure 4 It is a combined state diagram of the present utility model and the pipe;

[0017] Figure 5 It is a schematic structural diagram of the support ring of the present utility model;

[0018] Figure 6 It is a schematic structural diagram of the side view of the support ring of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The following further elaborates on the utility model of this application in detail with reference to the drawings and specific embodiments. In order to describe the technical solution clearly and completely, the following embodiments are selected for illustration; based on the content recorded in this application, other embodiments obtained without creative labor fall within the scope of protection of the present utility model.

[0020] In the following embodiments, it should be noted that the orientation or positional relationships such as "upper", "lower", "left", "right", "inner", "outer", "top / bottom", etc. in the terms are all based on the orientation or positional relationships shown in the drawings, and are only for the convenience of clearly describing this embodiment, rather than indicating or implying that the device or element referred to must have a specific orientation, so it cannot be construed as a limitation to this application.

[0021] Such as Figure 1-6As shown in the figure, a specific embodiment of the present utility model is an extrusion - formed connecting pipe fitting, which includes a pipe fitting body for communicating with a pipe 6 (suitable for metal pipes such as stainless steel pipes, and the end of the pipe for insertion is subjected to a necking treatment). The pipe fitting body is composed of at least one plug - in fixing part 1 and a pipe part 2. A first annular groove 101 for accommodating a C - ring 3 and a second annular groove 102 for accommodating a sealing ring 4 are formed on the plug - in fixing part 1. The front end of the pipe 6 is a necking structure 601 (the necking structure is a conical structure, and the diameter of its opening is smaller than the outer diameter of the pipe). An annular pressing groove 602 is formed in the middle of the pipe 6. When the pipe 6 is inserted into the pipe fitting body, the C - ring 3 can be clamped into the annular pressing groove 602 of the pipe 6.

[0022] A tapered transition connecting part 5 is formed between the plug - in fixing part 1 and the pipe part 2. One end of the transition connecting part 5 close to the plug - in fixing part 1 is a wide - mouth end 501, and one end of the transition connecting part 5 close to the pipe part is a narrow - mouth end 502. The inner diameter of the wide - mouth end 501 is larger than the inner diameter of the narrow - mouth end 502. As Figure 1 shown, the cross - sections of the transition connecting part 5, the first annular groove 101 and the second annular groove 102 are all arc - shaped transition structures, and the extrusion - forming technology is very suitable for processing such arc - shaped transition structures.

[0023] As Figure 1 shown, the first annular groove 101 is formed at the position near the pipe orifice of the plug - in fixing part 1, and then the second annular groove 102 is formed at the distal end of the pipe orifice. When it is necessary to shorten the length of the plug - in fixing part, it is also possible to form the second annular groove 102 at the position near the pipe orifice of the plug - in fixing part 1, and then form the first annular groove 101 at the distal end of the pipe orifice.

[0024] In order to better accommodate the C - ring and prevent the C - ring from being extruded from the first annular groove by the pipe when being squeezed, the first annular groove 101 is composed of a gradually expanding tapered tightening part 103 and a gradually narrowing tapered blocking part 104 ( Figure 3 divided by a dotted line in the figure); the maximum inner diameter and the minimum inner diameter of the tightening part 103 and the blocking part 104 are the same. The inner - diameter change rate of the tightening part 103 is smaller than that of the blocking part 104, that is, the inner - diameter change of the tightening part 103 is more gentle, which means the length of the tightening part 103 is greater than the length of the blocking part 104.

[0025] In order to increase the compression ratio of the rubber sealing ring, the diameter of the cross - section of the sealing ring 4 is larger than the diameter of the cross - section of the C - ring 3, and the maximum inner diameter of the second annular groove 102 is larger than the maximum inner diameter of the tightening part 103.

[0026] To meet the needs of different pipeline connections, the fitting body is one of a straight-through structure (e.g., equal-diameter straight-through, reducing straight-through), a tee structure (e.g., equal-diameter tee, reducing tee), a conversion joint structure (e.g., male British thread conversion joint, female British thread conversion joint), or an elbow structure (e.g., 45° elbow, 90° elbow). Among them Figure 1 is an equal-diameter straight-through, Figure 3 is an equal-diameter tee.

[0027] To ensure that the pipe can be smoothly inserted into the connecting pipe, the maximum inner diameter of the tightening part 103 is greater than the sum of the outer diameter of the pipe and twice the cross-sectional diameter of the C-ring 3.

[0028] To better accommodate and stabilize the C-ring, a support ring 7 (also of C-shaped structure; especially when the fitting is of small size, it is best to install the support ring) is also placed in the first annular groove 101. The support ring 7 is closely attached to the rear side of the C-ring 3, and the support ring 7 and the C-ring 3 are closely attached together and placed in the first annular groove 101; the side of the support ring 7 close to the C-ring 3 is a planar structure, and this planar structure is perpendicular to the axis of the fitting; the support ring 7 can facilitate the expansion of the C-ring when the pipe is inserted, effectively avoiding the situation where the C-ring falls to the bottom of the blocking part during installation and cannot open, thereby blocking the insertion of the pipe. The cross-section of the support ring 7 can be in the shape of a square, rectangle, triangle, sector, or trapezoid, etc. When the support ring is inserted into the first annular groove, the support ring naturally expands. At this time, the inner diameter of the support ring is greater than or equal to the outer diameter of the pipe (to avoid blocking the insertion of the pipe); the outer diameter of the support ring is less than the maximum inner diameter of the first annular groove, that is, after installation, the support ring is located near the middle section of the blocking part of the first annular groove. When the pipe is installed and inserted, the pipe can smoothly squeeze the C-ring to make it fully open at the maximum inner diameter of the first annular groove, and then the pipe passes through the C-ring and the support ring to reach the designated position.

[0029] To better stabilize the effect of accommodating the sealing ring and prevent the sealing ring from moving, when the fitting is of larger size, the second annular groove is of an asymmetric structure (when the size is small, the second annular groove can be of a symmetric structure). The second annular groove 102 is composed of a gradually expanding trumpet-shaped guiding part 105 and a gradually narrowing limiting part 106 ( Figure 3 divided by a dotted line in the figure), the maximum inner diameter and the minimum inner diameter of the guiding part 105 and the limiting part 106 are the same, and the inner diameter change rate of the guiding part 105 is less than the inner diameter change rate of the limiting part 106, that is, the inner diameter change of the guiding part 105 is more gentle, which means the length of the guiding part 105 is greater than the length of the limiting part 106.

[0030] The sealing ring is of O-shaped structure. When the pipe is used in a water supply system, the sealing ring is made of silicone rubber; when the pipe is used in a drainage system or a fire protection system, the sealing ring is made of chlorobutyl rubber or ethylene propylene diene monomer rubber (EPDM); when the pipe is used in a medical gas or vacuum environment, the sealing ring is made of fluororubber; when the pipe is used for sealing media such as gas, oil, and compressed air, the sealing ring is made of nitrile rubber or fluororubber.

[0031] The extrusion forming includes processes such as internal high-pressure forming, mechanical bulging, and rolling. For example, Figure 1-3 the cross-sections of the first annular groove and the second annular groove are of arc-shaped groove structure, and the extrusion forming is suitable for processing such arc-shaped groove structures (the extrusion forming process is not suitable for processing rectangular groove structures with vertical side walls).

[0032] During use, first insert the sealing ring into the second annular groove, and then insert the C-ring into the first annular groove; insert the pipe with a closed-end structure through the opening of the plug-in fixing part until the pipe is inserted into the transition connection part, and the connection operation is completed after insertion. The principle is as follows: when pulling out the pipe outward, the pipe will drive the C-ring to move towards the tightening part. Since the tightening part is of a conical structure, the tightening part of the first annular groove will squeeze the C-ring to further contract towards the center to clamp the pipe, making the pipe unable to be pulled out from the fitting body. If there is a water leakage between the pipe and the fitting body, a specified fixture can be used to apply pressure to the second annular groove to clamp it, and by extrusion, the compression ratio of the sealing ring is increased, thereby achieving the purpose of plugging the water leakage point.

[0033] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any minor modifications, equivalent replacements, and improvements made to the above embodiments based on the technical essence of the present invention shall be included within the protection scope of the technical solution of the present invention.

Claims

1. An extrusion-molded connecting pipe fitting, comprising a pipe fitting body for connecting pipes, characterized in that: The pipe fitting body is composed of at least one plug-in fixing part and a pipe part. A first annular groove for accommodating a C-ring and a second annular groove for accommodating a sealing ring are formed on the plug-in fixing part; A transition connecting part is formed between the plug-in fixing part and the pipe part. One end of the transition connecting part close to the plug-in fixing part is a wide-mouth end, and one end of the transition connecting part close to the pipe part is a narrow-mouth end. The inner diameter of the wide-mouth end is greater than the inner diameter of the narrow-mouth end.

2. The extrusion molding connecting pipe fitting according to claim 1, characterized in that: The first annular groove is composed of a gradually expanding tightening part and a gradually narrowing blocking part, and the length of the tightening part is greater than the length of the blocking part.

3. The extrusion molding connecting pipe fitting according to claim 2, characterized in that: The diameter of the cross-section of the sealing ring is greater than the diameter of the cross-section of the C-ring, and the maximum inner diameter of the second annular groove is greater than the maximum inner diameter of the tightening part.

4. The extrusion molding connecting pipe fitting according to claim 1, wherein: The pipe fitting body is one of a straight-through structure, a tee structure, a reducing joint structure, or an elbow structure.

5. The extrusion-molded connecting pipe fitting according to claim 2, characterized in that: The maximum inner diameter of the tightening part is greater than the sum of the outer diameter of the pipe material and twice the diameter of the cross-section of the C-ring.

6. The extrusion molding connecting pipe fitting according to claim 1, wherein: A support ring is also placed in the first annular groove. The support ring is closely attached to the rear side of the C-ring, and the support ring and the C-ring are placed in the first annular groove together.

7. The extrusion molding connection pipe fitting according to claim 1, wherein: The second annular groove is an asymmetric structure. The second annular groove is composed of a gradually expanding guiding part and a gradually narrowing limiting part, and the length of the guiding part is greater than the length of the limiting part.

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