A self-anchoring connecting pipe fitting

Abstract

The application discloses a self-anchored connecting pipe fitting for connecting a plug-in pipe, which comprises a straight-through pipe, a three-way pipe, a connecting elbow, a pull-resistant spring for clamping the plug-in pipe, and a sealing element with a negative pressure resistance function; the straight-through pipe, the three-way pipe and the connecting elbow are used alternatively or in combination; the joints of the straight-through pipe, the three-way pipe and the connecting elbow are all provided with mounting grooves, the inner sides of the mounting grooves are provided with the sealing elements, and the outer sides of the mounting grooves are provided with the pull-resistant springs; the plug-in pipe is provided with a ring of grooves, the plug-in pipe is inserted into the mounting groove of the required pipe fitting, the pull-resistant spring is clamped into the groove, and the sealing element is tightly attached to the outer side wall of the plug-in pipe. The device has the advantages of simple structure, quick and efficient installation, low pipe fitting manufacturing difficulty coefficient, low possibility of fluid medium leakage, adjustable angle after installation, self-provided pipeline pressure difference change, and no need of additional installation of compensators.

Description

Technical Field

[0001] This invention relates to the field of pipe fittings technology, and in particular to a self-anchoring pipe fitting. Background Technology

[0002] Existing stainless steel pipe fittings use compression connection methods, such as D-shaped compression, S-shaped compression, ring compression D-shaped compression, ring compression S-shaped compression, and adhesive compression. These methods are connected by various threaded connections, including pipe thread, pipe tapered thread, and arc-shaped tapered thread. However, these connection methods are not effective, require heavy installation tools, are difficult to install, and cause deformation of the seals when negative pressure is applied inside the pipe, which can easily lead to leakage. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a self-anchoring pipe fitting.

[0004] This invention is achieved through the following technical solution: a self-anchoring connecting pipe fitting for connecting inserts, comprising a straight pipe, a tee pipe, a connecting elbow, an anti-pull-out spring for clamping the insert, and a sealing element with anti-negative pressure function; the straight pipe, tee pipe, and connecting elbow are used individually or in combination; both ends of the straight pipe are recessed from the inside to the outside to form a first mounting groove, with the inside of the straight pipe as the inner side, the sealing element is provided inside the first mounting groove, and the anti-pull-out spring is provided outside the first mounting groove; in the tee pipe, the three connectors are respectively from the inside to the outside of the pipe. A second mounting groove is formed by an external indentation, with the inside of the tee pipe as the inner side. The sealing element is provided on the inner side of the second mounting groove, and the anti-pull-out spring is provided on the outer side of the second mounting groove. Both ends of the connecting elbow are respectively recessed from the inside of the pipe to the outside to form a third mounting groove, with the inside of the connecting elbow as the inner side. The sealing element is provided on the inner side of the third mounting groove, and the anti-pull-out spring is provided on the outer side of the third mounting groove. A groove is provided around the outer periphery of the insertion tube. The insertion tube is inserted into the mounting groove of the required pipe fitting. The anti-pull-out spring is engaged in the groove, and the sealing element is tightly attached to the outer wall of the insertion tube.

[0005] In the device, the straight-through pipe, the three-way pipe and the connecting elbow are matching products, which can be used alone or in combination; for the cooperation between the straight-through pipe and the insertion pipe, one end of the insertion pipe provided with a groove is inserted into the straight-through pipe, and the structure is locked by a sealing member and an anti-pull-out spring; for the cooperation between the three-way pipe and the insertion pipe, one end of the insertion pipe provided with the groove is inserted into the end of the three-way pipe, and the structure is locked by the sealing member and the anti-pull-out spring; for the cooperation between the connecting elbow and the insertion pipe, one end of the insertion pipe provided with the groove is inserted into the connecting elbow, and the structure is locked by the sealing member and the anti-pull-out spring; when the straight-through pipe, the three-way pipe and the connecting elbow are used in combination, connection can be achieved by using short-circuited insertion pipes as connecting pieces. The arrangement of the sealing member eliminates the negative pressure generated after the insertion pipe is installed and used; the anti-pull-out spring can clamp the insertion pipe and prevent it from falling off.

[0006] The sealing member is formed by overlapping at least two sealing rings in parallel, the overlapping parts are fused together, a concave position is formed on the inner side wall of at least one of the sealing rings, the sealing member is sleeved on the outer periphery of a pipe fitting, and the concave position is tightly attached to the outer wall of the pipe fitting. The sealing member formed by overlapping at least two sealing rings has better sealing performance. The arrangement of the concave position provides negative pressure resistance, can eliminate negative pressure and eliminate noise generated during pressure relief, so as to achieve a better sealing effect in the installation of stainless steel pipe fittings.

[0007] The sealing ring is an O-shaped sealing ring; a plurality of the concave positions are provided, which are uniformly arranged on the inner side wall of the sealing ring. The O-shaped sealing ring can cooperate with the pipe fitting more closely; the plurality of uniformly arranged concave positions can enable the sealing member to have better sealing performance and eliminate negative pressure and noise generated during pressure relief.

[0008] Four concave positions are provided, and an included angle of 90 degrees is formed between adjacent concave positions.

[0009] Two sealing rings are provided, and each sealing ring is provided with two said concave positions; the connecting line between the two concave positions on each sealing ring passes through the central axis of the sealing ring; the connecting line between the two concave positions on one sealing ring is perpendicular to the connecting line between the two concave positions on the other sealing ring. In the present application, the two sealing rings form a sealing member with a cross-section of an equilateral figure-eight structure.

[0010] The sealing ring is made by mixing fluororubber and a flame retardant, and the flame retardant is chlorine-based flame retardant, bromine-based flame retardant, phosphorus-based flame retardant, aluminum hydroxide, magnesium hydroxide, red phosphorus or antimony trioxide.

[0011] The pull-out spring includes a ring-shaped spring body with several internal teeth and several external teeth arranged alternately. The spring body has an umbrella-shaped structure. The spring body is sleeved on the outer circumference of the pipe fitting and closely adheres to the outer wall of the pipe fitting, or the spring body is sleeved in a groove on the outer circumference of the pipe fitting and closely adheres to the wall of the groove. This pull-out spring, utilizing the alternating distribution of internal and external teeth, has a certain degree of elasticity and can be well engaged and fixed to the pipe fitting. The inner side of the internal teeth can closely adhere to the outer wall of the pipe fitting or the groove of the pipe fitting, thereby stabilizing and fixing the pipe fitting.

[0012] The inner sides of several internal teeth are located on the same circumference, and the outer sides of several external teeth are located on the same circumference. Each internal tooth includes an internal tooth groove and an internal tooth tip, and each external tooth includes an external tooth groove and an external tooth tip. The internal tooth tip of each internal tooth is located inside the spring body, and the internal tooth groove of each internal tooth faces outward from the spring body and is recessed into the root of the external tooth. The external tooth tip of each external tooth is located outside the spring body, and the external tooth groove of each external tooth faces inward from the spring body and is recessed into the root of the internal tooth. The inner walls of all internal teeth are located on the same circumference, ensuring compatibility with the fitting and enabling a tight, secure fit.

[0013] The inner tooth tip is a tooth tip with a circular arc-shaped plane, and the outer tooth tip is a tooth tip with a circular arc-shaped plane; alternatively, the inner tooth tip is a tooth tip with a conical structure, and the outer tooth tip is a tooth tip with a conical structure; alternatively, the inner tooth groove of the inner tooth is a circular arc-shaped groove, and the outer tooth groove of the outer tooth is a circular arc-shaped groove, with the curvature of the inner tooth groove being smaller than that of the outer tooth groove. A circular arc-shaped inner tooth tip allows for a more perfect fit with the pipe fitting, while a circular arc-shaped outer tooth tip provides a more aesthetically pleasing appearance.

[0014] The spring body is made of stainless steel; the inner tooth tip of the inner tooth is a rectangular structure, the inner tooth groove is a rectangular groove, the outer tooth tip of the outer tooth is a rectangular structure, and the outer tooth groove is a rectangular groove.

[0015] Compared with the prior art, the advantages of this invention are: the device has a simple structure, is quick and efficient to install, has a low manufacturing difficulty coefficient for pipe fittings, is less prone to leakage of fluid media, the angle is adjustable after installation, it has its own pipeline pressure difference change function, and does not require the installation of an additional compensator; it has an anti-negative pressure function, which can eliminate negative pressure and eliminate noise during pressure relief; the anti-pull-out spring uses an alternating distribution of internal and external teeth, which has a certain elasticity and can be well embedded and fixed with the pipe fittings. The inner side of the internal teeth can be tightly attached to the outer wall of the pipe fittings or the groove of the pipe fittings, thereby making the pipe fittings stable and fixed. Attached Figure Description

[0016] Figure 1 This is an exploded view of the structure of an embodiment of the present invention, cut longitudinally.

[0017] Figure 2 This is a cross-sectional view of the straight pipe taken along the longitudinal direction according to an embodiment of the present invention;

[0018] Figure 3 for Figure 2 Enlarged view of part B in the middle

[0019] Figure 4 This is a longitudinal sectional view of the three-way pipe according to an embodiment of the present invention;

[0020] Figure 5 This is a longitudinal sectional view of the connecting elbow in an embodiment of the present invention;

[0021] Figure 6 This is a front view of the sealing element according to an embodiment of the present invention;

[0022] Figure 7 for Figure 6 A magnified view of a section at point A in the middle;

[0023] Figure 8 This is a left view of the seal according to an embodiment of the present invention;

[0024] Figure 9 This is a top view of the sealing element according to an embodiment of the present invention;

[0025] Figure 10 This is a front view of a sealing ring in a sealing element according to an embodiment of the present invention;

[0026] Figure 11 This is a front view of another sealing ring in the sealing element of an embodiment of the present invention;

[0027] Figure 12 This is a schematic diagram of the structure of the first anti-pull-out spring in an embodiment of the present invention;

[0028] Figure 13 This is a schematic diagram of the structure of the second anti-pull-out spring in an embodiment of the present invention;

[0029] Figure 14 This is a schematic diagram of the structure of the third anti-pull-out spring in an embodiment of the present invention.

[0030] The meanings of the symbols in the attached diagram are as follows: 1. Sealing ring; 2. Recess; 3. Straight pipe; 31. First mounting groove; 4. T-pipe; 41. Second mounting groove; 5. Connecting elbow; 51. Third mounting groove; 6. Pull-out spring; 7. Seal; 11. Spring body; 12. Inner tooth top; 13. Inner tooth groove; 14. Outer tooth top; 15. Outer tooth groove. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0032] Examples

[0033] Referring to Figures 1 to 5 , the present invention relates to a self-anchoring connecting pipe fitting for connecting intubation tubes, comprising a straight-through pipe 3, a three-way pipe 4, a connecting elbow 5, an anti-pulling spring 6 for clamping the intubation tube, and a sealing member 7 with negative pressure resistance; the straight-through pipe 3, the three-way pipe 4, and the connecting elbow 5 are used individually or in combination; both ends of the straight-through pipe 3 are recessed inward from the inside of the pipe to the outside to form a circle of first installation grooves 31, with the inside of the straight-through pipe 3 as the inner side, the sealing member 7 is arranged inside the first installation groove 31, and the anti-pulling spring 6 is arranged outside the first installation groove 31; in the three-way pipe 4, three connecting heads are each recessed inward from the inside of the pipe to the outside to form a circle of second installation grooves 41, with the inside of the three-way pipe 4 as the inner side, the sealing member 7 is arranged inside the second installation groove 41, and the anti-pulling spring 6 is arranged outside the second installation groove 41; both ends of the connecting elbow 5 are recessed inward from the inside of the pipe to the outside to form a circle of third installation grooves 51, with the inside of the connecting elbow 5 as the inner side, the sealing member 7 is arranged inside the third installation groove 51, and the anti-pulling spring 6 is arranged outside the third installation groove 51; the outer circumference of the intubation tube is provided with a circle of groove, the intubation tube is inserted into the installation groove of the required pipe fitting, the anti-pulling spring 6 is clipped into the groove, and the sealing member 7 closely abuts against the outer side wall of the intubation tube.

[0034] In the device, the straight-through pipe 3, the three-way pipe 4 and the connecting elbow 5 are matching products, which can be used alone or in combination; for the cooperation between the straight-through pipe 3 and the intubation tube, insert the end of the intubation tube provided with the groove into the straight-through pipe 3, and lock the structure through the sealing member 7 and the anti-pulling spring 6; for the cooperation between the three-way pipe 4 and the intubation tube, insert the end of the intubation tube provided with the groove into the end of the three-way pipe 4, and lock the structure through the sealing member 7 and the anti-pulling spring 6; for the cooperation between the connecting elbow 5 and the intubation tube, insert the end of the intubation tube provided with the groove into the connecting elbow 5, and lock the structure through the sealing member 7 and the anti-pulling spring 6; when the straight-through pipe 3, the three-way pipe 4 and the connecting elbow 5 are used in combination, the connection can be carried out by using short-connected intubation tubes as connecting pieces. The arrangement of the sealing member 7 eliminates the negative pressure generated after the intubation tube is installed and used; the anti-pulling spring 6 can clamp the intubation tube to prevent it from falling off.

[0035] Referring to Figures 6 to 11 , the sealing member 7 is formed by overlapping at least two layers of sealing rings 1 side by side, the overlapping parts are fused together, the inner side wall of at least one layer of sealing ring 1 is provided with a concave portion 2, the sealing member 7 is sleeved on the outer circumference of the pipe fitting, and the concave portion 2 closely abuts against the outer wall of the pipe fitting. The sealing member 7 formed by overlapping at least two layers of sealing rings 1 has better sealing performance. The arrangement of the concave portion 2 provides negative pressure resistance, which can eliminate negative pressure and noise generated during pressure relief, so as to achieve a better sealing effect in the installation of stainless steel pipe fittings.

[0036] The sealing ring 1 is an O-ring; several recesses 2 are provided, evenly distributed on the inner wall of the sealing ring 1. The O-ring 1 can fit more tightly with the pipe fitting; the evenly distributed recesses 2 can give the sealing element 7 better sealing performance and can eliminate noise generated during negative pressure and pressure relief.

[0037] There are four recesses 2, and adjacent recesses 2 form a 90-degree angle.

[0038] The sealing ring 1 has two layers, and each layer of the sealing ring 1 has two recesses 2. The line connecting the two recesses 2 on each layer of the sealing ring 1 passes through the central axis of the sealing ring 1. The line connecting the two recesses 2 on the same layer of the sealing ring 1 is perpendicular to the line connecting the two recesses 2 on the other layer of the sealing ring 1. In this application, the two sealing rings 1 form a sealing element 7 with a figure-eight cross-section.

[0039] The sealing ring 1 is made of a mixture of fluororubber and a flame retardant. The flame retardant can be a chlorine-based flame retardant, a bromine-based flame retardant, a phosphorus-based flame retardant, aluminum hydroxide, magnesium hydroxide, red phosphorus, or antimony trioxide. In this embodiment, it is made by mixing fluororubber and a flame retardant. The mixing ratio, reaction temperature, catalyst, etc., can be appropriately adjusted according to the existing manufacturing process of the sealing ring 1, which is prior art and therefore does not require detailed analysis. In this embodiment, the sealing ring 1 is made of a high-temperature and low-temperature resistant polymer material.

[0040] See Figures 12 to 14 The pull-out spring 6 includes a ring-shaped spring body 11. The spring body 11 has several internal teeth and several external teeth, which are distributed alternately. The spring body 11 has an umbrella-shaped structure. The spring body 11 is fitted around the outer circumference of the pipe fitting and closely adheres to the outer wall of the pipe fitting, or the spring body 11 is fitted into a groove on the outer circumference of the pipe fitting and closely adheres to the wall of the groove. This pull-out spring 6, utilizing the alternating distribution of internal and external teeth, has a certain degree of elasticity and can be well engaged and fixed to the pipe fitting. The inner side of the internal teeth can closely adhere to the outer wall of the pipe fitting or the groove of the pipe fitting, thereby ensuring the stable fixation of the pipe fitting.

[0041] The inner sides of several internal teeth are located on the same circumference, and the outer sides of several external teeth are located on the same circumference. Each internal tooth includes an internal tooth groove 13 and an internal tooth tip 12, while each external tooth includes an external tooth groove 15 and an external tooth tip 14. The internal tooth tip 12 of the internal tooth is located inside the spring body 11, and the internal tooth groove 13 of the internal tooth faces outward from the spring body 11 and is embedded in the root of the external tooth. The external tooth tip 14 of the external tooth is located outside the spring body 11, and the external tooth groove 15 of the external tooth faces inward from the spring body 11 and is embedded in the root of the internal tooth. The inner walls of all internal teeth are located on the same circumference, ensuring compatibility with the fitting and enabling a tight, secure fit.

[0042] The inner tooth tip 12 is a tooth tip with a curved plane, and the outer tooth tip 14 is a tooth tip with a curved plane; alternatively, the inner tooth tip 12 is a tooth tip with a conical structure, and the outer tooth tip 14 is a tooth tip with a conical structure; or, the inner tooth groove 13 of the inner tooth is a curved tooth groove, and the outer tooth groove 15 of the outer tooth is a curved tooth groove, with the curvature of the inner tooth groove 13 being smaller than that of the outer tooth groove 15. The curved inner tooth tip 12 allows for a more perfect fit with the pipe fitting, while the curved outer tooth tip 14 provides a more aesthetically pleasing appearance.

[0043] The spring body 11 is a spring made of stainless steel; the inner tooth tip 12 of the inner tooth is a rectangular structure, the inner tooth groove 13 is a rectangular groove, the outer tooth tip 14 of the outer tooth is a rectangular structure, and the outer tooth groove 15 is a rectangular groove.

[0044] In this embodiment, the flame retardant used in the sealing ring 1 is as follows:

[0045] Firstly, there are chlorine-based flame retardants: these are mainly chlorinated paraffins with high chlorine content, primarily chlorinated paraffin-52 and chlorinated paraffin-40. Currently, chlorine-based flame retardants are developing towards being pollution-free, high-purity, highly thermally stable, and having high chlorine content, with chlorinated paraffin-70 being a representative product.

[0046] Secondly, there are brominated flame retardants: most decompose at 200℃~300℃. During decomposition, they capture free radicals generated by the degradation reaction of polymer materials, delaying or terminating the chain reaction of combustion. The released HBr is a flame-retardant gas that can coat the surface of materials, acting as a barrier to surface flammable gases. Brominated flame retardants have a wide range of applications and are among the world's most produced organic flame retardants. Major products include decabromodiphenyl ether, tetrabromobisphenol A, pentabromotoluene, and hexabromocyclododecane, among others.

[0047] Thirdly, phosphorus-based flame retardants: These are also flame retardants with good flame-retardant properties. Driven by the global trend towards non-halogenated flame retardants, extensive research has been conducted abroad. Major organophosphorus flame retardant products include triphenol phosphate, xylene phosphate, and styrene-butadiene phosphate. Phosphate esters are characterized by their dual functions of flame retardancy and plasticization. Major phosphorus-containing inorganic flame retardants include red phosphorus flame retardants, ammonium phosphate salts, and ammonium polyphosphate. Red phosphorus exhibits better flame-retardant effects than phosphate esters, and its usage is increasing. Phosphorus-containing inorganic flame retardants are widely used due to their good thermal stability, non-volatility, lack of corrosive gases, long-lasting effect, and low toxicity.

[0048] Aluminum hydroxide is a flame retardant that combines flame retardancy, smoke suppression, and filling functions. It is non-toxic, non-corrosive, has good stability, does not produce toxic gases at high temperatures, and is inexpensive and widely available. Magnesium hydroxide decomposes between 340℃ and 490℃. It has good thermal stability and excellent flame retardant and smoke suppression effects, making it particularly suitable for polyolefin plastics processed at high temperatures. The combined use of aluminum hydroxide and magnesium hydroxide complements each other, resulting in better flame retardant performance than when used alone.

[0049] The above detailed description is a specific description of feasible embodiments of the present invention. These embodiments are not intended to limit the patent scope of the present invention. All equivalent implementations or modifications that do not depart from the present invention should be included in the patent scope of this case.

Claims

1. A self-anchoring connector for connecting insertion tubes, characterized in that: The system includes a straight pipe, a tee pipe, a connecting elbow, a pull-out spring for securing the insertion tube, and a sealing element with anti-negative pressure function. The straight pipe, tee pipe, and connecting elbow can be used individually or in combination. Each end of the straight pipe has a first mounting groove formed by indentation from the inside to the outside. The sealing element is located inside the first mounting groove, and the pull-out spring is located outside the first mounting groove. In the tee pipe, each of the three connectors has a second mounting groove formed by indentation from the inside to the outside. The sealing element is located inside the second mounting groove, and the pull-out spring is located outside the second mounting groove. Each end of the connecting elbow has a third mounting groove formed by indentation from the inside to the outside. The sealing element is located inside the third mounting groove, and the sealing element is located outside the third mounting groove. The document describes a pull-out spring; a groove is provided around the outer periphery of the insertion tube, the insertion tube is inserted into the mounting groove of the required fitting, the pull-out spring is engaged in the groove, and the sealing element is tightly attached to the outer wall of the insertion tube; the sealing element is formed by two overlapping sealing rings, which are fused together at the overlap, and at least one sealing ring has a recess on its inner sidewall, the sealing element is fitted around the outer periphery of the insertion tube, and the recess is tightly attached to the outer wall of the insertion tube; the sealing ring is an O-ring; each sealing ring has two recesses; the line connecting the two recesses on each sealing ring passes through the central axis of the sealing ring; the line connecting the two recesses on the same sealing ring is perpendicular to the line connecting the two recesses on another sealing ring; the sealing ring is made of a mixture of fluororubber and flame retardant, and the flame retardant is a chlorine-based flame retardant, a bromine-based flame retardant, a phosphorus-based flame retardant, aluminum hydroxide, magnesium hydroxide, red phosphorus, or antimony trioxide.

2. The self-anchoring pipe fitting according to claim 1, characterized in that: The pull-out spring includes a spring body with a ring structure. The spring body has a plurality of internal teeth and a plurality of external teeth, which are distributed alternately. The spring body has an umbrella-shaped structure. The spring body is sleeved on the outer periphery of the insertion tube and closely attached to the outer wall of the insertion tube, or the spring body is sleeved in a groove on the outer periphery of the insertion tube and closely attached to the wall of the groove.

3. The self-anchoring connecting pipe fitting according to claim 2, characterized in that: The inner sides of several internal teeth are located on the same circumference, and the outer sides of several external teeth are located on the same circumference; each internal tooth includes an internal tooth groove and an internal tooth tip, and each external tooth includes an external tooth groove and an external tooth tip; the internal tooth tip of each internal tooth is located inside the spring body, and the internal tooth groove of each internal tooth faces outward from the spring body and is embedded in the root of the external tooth; the external tooth tip of each external tooth is located outside the spring body, and the external tooth groove of each external tooth faces inward from the spring body and is embedded in the root of the internal tooth.

4. The self-anchoring pipe fitting according to claim 3, characterized in that: The inner tooth tip is an arc-shaped tooth tip, and the outer tooth tip is an arc-shaped tooth tip; or, the inner tooth tip is a conical tooth tip, and the outer tooth tip is a conical tooth tip; or, the inner tooth groove of the inner tooth is an arc-shaped tooth groove, and the outer tooth groove of the outer tooth is an arc-shaped tooth groove, wherein the curvature of the inner tooth groove is smaller than the curvature of the outer tooth groove.

5. The self-anchoring connecting pipe fitting according to claim 3, characterized in that: The spring body is made of stainless steel; the inner tooth tip of the inner tooth is a rectangular structure, the inner tooth groove is a rectangular groove, the outer tooth tip of the outer tooth is a rectangular structure, and the outer tooth groove is a rectangular groove.

Images