A high-strength steel wire wound reinforced pipe fitting and its use method

Abstract

The present invention relates to a high-strength steel wire wound reinforced pipe fitting and a method for using the same, and belongs to the technical field of steel wire wound reinforced pipe fittings. When the high-strength steel wire wound reinforced pipe fitting is used in a fire protection pipe system, when high-pressure water flow impacts the inner rubber layer, the first sliding part axially displaces along the guide rail in coordination with the spring part to form a first-level buffer, converting the peak impact force into elastic potential energy; when the pressure fluctuation triggers the limit part, the arc-shaped outer edge of the swing rod contacts the baffle rod to produce a lever effect, forcing the second sliding part to displace in the opposite direction, converting the rigid stress borne by the outer rubber layer into a flexible deformation of the intermediate buffer layer, effectively eliminating the stiffness mutation interface, and the device improves the stress transfer continuity between the intermediate buffer layer and the outer rubber layer, and at the same time utilizes the multi-directional displacement compensation mechanism under the constraint of the guide rail to reduce the reflectivity of high-frequency vibration energy, fundamentally solving the problem of the stiffness mutation interface formed between the low-rigidity buffer layer and the high-rigidity outer rubber layer, resulting in the interruption of the stress transfer path.

Description

Technical Field

[0001] The invention belongs to the technical field of steel wire wound reinforced pipe fittings, and in particular relates to a high-strength steel wire wound reinforced pipe fitting and a use method thereof. Background Art

[0002] As a new type of structural composite material, high-strength steel wire wound reinforced pipe fittings have been used in the industrial field due to their excellent mechanical properties and pressure resistance. The pipe fittings are mainly composed of an inner rubber layer, a steel wire reinforcement layer, an intermediate buffer layer and an outer rubber layer: the inner rubber layer is in direct contact with the conveying medium and is usually made of corrosion-resistant synthetic rubber or thermoplastic elastomer; the steel wire reinforcement layer uses high-strength steel wire as the skeleton and is embedded in the pipe body through spiral winding or cross-weaving technology to form a core support structure that is resistant to tension and compression; the intermediate buffer layer is mostly made of silicone or low-modulus rubber material to absorb high-frequency vibration energy; the outer rubber layer is composed of wear-resistant polymer or woven fiber layer, which undertakes external protection function. This composite structure achieves the unity of lightweight and high strength through the synergistic effect of materials and processes, and is particularly suitable for engineering scenarios that need to withstand complex loads.

[0003] However, when such pipe fittings are used in fire protection piping systems, their performance faces severe challenges. Fire protection pipes not only need to withstand the continuous impact of high-pressure water flow for a long time, but also need to cope with instantaneous high-pressure fluctuations and high-frequency vibrations under extreme working conditions during emergency rescue. Under such dynamic loads, the modulus difference between the intermediate buffer layer and the outer rubber layer is significantly amplified: the low-rigidity buffer layer and the high-rigidity outer rubber layer form a stiffness mutation interface, resulting in the interruption of the stress transfer path. Specifically, the impact force generated by the high-pressure fluctuation forms stress concentration at the interface, while the energy reflection caused by the high-frequency vibration causes a local stress wave superposition effect. This dual effect makes the interface bonding area a structural weak link, which is very likely to cause interlayer delamination, microcrack expansion and even fatigue fracture of the steel wire layer, seriously weakening the overall strength and service life of the pipe fitting. To this end, a high-strength steel wire wrapped reinforced pipe fitting and a method for using the same are proposed. Summary of the Invention

[0004] In order to solve the above-mentioned problems existing in the prior art, the present invention provides a high-strength steel wire wound reinforced pipe fitting and a method for using the same, which solves the problem in the prior art that the low-rigidity buffer layer and the high-rigidity outer rubber layer form a stiffness mutation interface, resulting in the interruption of the stress transfer path.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A high-strength steel wire wound reinforced pipe fitting comprises an inner rubber layer, a steel wire reinforced layer, an intermediate buffer layer and an outer rubber layer, wherein the inner rubber layer, the steel wire reinforced layer, the intermediate buffer layer and the outer rubber layer are sequentially connected to form a pipe fitting as a whole; a stress transition device is provided between the intermediate buffer layer and the outer rubber layer, and the stress transition device comprises a first sliding portion, a second sliding portion, a supporting portion, a swinging portion rotatably arranged on the supporting portion, a spring portion and a limiting portion, one end of the first sliding portion is fixedly arranged on the intermediate buffer layer, one end of the second sliding portion is fixedly arranged on the outer rubber layer, and the supporting portion is located between the intermediate buffer layer and the outer rubber layer The gap is formed, and the supporting part passes through the middle buffer layer and is connected with the steel wire reinforced layer. The two ends of the swinging part are respectively hinged with the first sliding part and the second sliding part. The limiting part is arranged on the supporting part between the other end of the first sliding part and the outer rubber layer. The two ends of the spring part are respectively connected with the other end of the first sliding part and the outer rubber layer. The impact force of the liquid in the whole pipe drives the first sliding part to squeeze the spring part. The limiting part and the first sliding part are fitted to drive the swinging part to swing. The swinging part drives the second sliding part to move in the direction close to the middle buffer layer, so that the stress between the middle buffer layer and the outer rubber layer is continuously transmitted.

[0007] As a further solution of the present invention, the support portion is further provided with guide rails that cooperate with the first sliding portion and the second sliding portion.

[0008] As a further solution of the present invention, a blocking rod is vertically provided on the other end of the first sliding portion, and the blocking rod can be fitted with the swinging portion.

[0009] As a further solution of the present invention, the swinging part is a swinging rod, the two ends of the swinging rod are respectively hinged to the first sliding part and the second sliding part, the swinging rod between the first sliding part and the second sliding part is rotatably set on the support part, and the outer edge of the swinging rod is an arc structure, and the arc structure can be fitted with the barrier rod.

[0010] As a further solution of the present invention, the number of the stress transition devices is greater than or equal to four, and the stress transition devices are arranged at equal intervals.

[0011] As a further solution of the present invention, the gap between the intermediate buffer layer and the outer rubber layer outside the stress transition device is filled with a closed-cell foam elastomer or a flexible polyurethane composite material.

[0012] As a further solution of the present invention, the steel wire reinforcement layer is high-strength steel wire made of high-carbon steel or stainless steel.

[0013] As a further solution of the present invention, the surface of the outer rubber layer is coated with an anti-corrosion coating.

[0014] A method for using a high-strength steel wire wound reinforced pipe fitting comprises the following steps:

[0015] S1: Before installation, check the mechanical integrity of the pipe fittings, confirm that the degree of freedom of rotation of the swing part of the stress transition device is ≥30°, the gap between the first sliding part and the guide rail is ≤0.2mm, and the pre-compression of the spring part is 10%-15% of the free length;

[0016] S2: Ensure uniform circumferential stress distribution between the outer rubber layer and the intermediate buffer layer;

[0017] S3: When the fluid is introduced, the pressure in the tube causes the first sliding part to produce axial displacement along the guide rail of the support part, and at the same time, the spring part is compressed to more than half of the designed stroke, triggering the limit part;

[0018] S4: When the pressure fluctuates, the contact between the blocking rod and the arc surface of the swing rod produces a lever effect, forcing the second sliding part to move in the opposite direction along the guide rail to compensate for the displacement, thus achieving dynamic stress balance between the intermediate buffer layer and the outer rubber layer;

[0019] S5: During periodic maintenance, measure the residual compression stroke of the spring part. If the rebound margin is less than half of the initial value, replace the swing part hinge shaft simultaneously, check the wear of the guide rail working surface, and perform repair processing.

[0020] The beneficial effects of the present invention are:

[0021] When high-strength steel wire wrapped reinforced pipe fittings are used in fire protection pipe systems, when high-pressure water flow impacts the inner rubber layer, the axial displacement of the first sliding part along the guide rail cooperates with the spring part to form a first-level buffer, converting the peak impact force into elastic potential energy; when the pressure fluctuation triggers the limit part, the arc-shaped outer edge of the swing rod contacts the baffle rod to produce a lever effect, forcing the second sliding part to displace in the opposite direction, converting the rigid stress borne by the outer rubber layer into flexible deformation of the middle buffer layer, effectively eliminating the stiffness mutation interface. The device improves the stress transfer continuity between the middle buffer layer and the outer rubber layer, and at the same time utilizes the multi-directional displacement compensation mechanism under the constraint of the guide rail to reduce the reflectivity of high-frequency vibration energy, fundamentally solving the problem of the stiffness mutation interface formed by the low-rigidity buffer layer and the high-rigidity outer rubber layer, resulting in the interruption of the stress transfer path. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] To facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a structural schematic diagram of the stress transition device of the present invention;

[0025] Figure 3 It is a top view of the partial structure of the first sliding part and the second sliding part of the present invention.

[0026] Description of main component symbols:

[0027] In the figure: 1. Inner rubber layer; 2. Steel wire reinforcement layer; 3. Intermediate buffer layer; 4. Outer rubber layer; 5. Stress transition device; 51. First sliding part; 52. Second sliding part; 53. Support part; 54. Swinging part; 55. Spring part; 56. Limiting part. DETAILED DESCRIPTION

[0028] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0029] See also Figure 1 - Figure 3 , this embodiment provides a high-strength steel wire wound reinforced pipe fitting, comprising an inner rubber layer 1, a steel wire reinforced layer 2, an intermediate buffer layer 3 and an outer rubber layer 4, wherein the inner rubber layer 1, the steel wire reinforced layer 2, the intermediate buffer layer 3 and the outer rubber layer 4 are sequentially connected to form a pipe fitting as a whole; a stress transition device 5 is provided between the intermediate buffer layer 3 and the outer rubber layer 4, and the stress transition device 5 comprises a first sliding portion 51, a second sliding portion 52, a supporting portion 53, a swinging portion 54 rotatably arranged on the supporting portion 53, a spring portion 55 and a limiting portion 56, one end of the first sliding portion 51 is fixedly arranged on the intermediate buffer layer 3, one end of the second sliding portion 52 is fixedly arranged on the outer rubber layer 4, and the supporting portion 53 is located between the intermediate buffer layer 3 and the outer rubber layer 4. The gap between the rubber layer 4 and the support portion 53 passes through the intermediate buffer layer 3 and is connected to the steel wire reinforcement layer 2. The two ends of the swinging portion 54 are respectively hinged to the first sliding portion 51 and the second sliding portion 52. The limiting portion 56 is provided on the support portion 53 between the other end of the first sliding portion 51 and the outer rubber layer 4. The two ends of the spring portion 55 are respectively connected to the other end of the first sliding portion 51 and the outer rubber layer 4. The impact force of the liquid in the entire pipe drives the first sliding portion 51 to squeeze the spring portion 55. The limiting portion 56 and the first sliding portion 51 are in contact with each other to drive the swinging portion 54 to swing. The swinging portion 54 drives the second sliding portion 52 to move toward the direction close to the intermediate buffer layer 3, so that the stress between the intermediate buffer layer 3 and the outer rubber layer 4 is continuously transmitted.

[0030] The spring portion 55 is a spring, the swing portion 54 is a swing rod, the support portion 53 is a support block, and the first sliding portion 51 and the second sliding portion 52 are two rectangular sliding frames, such as Figure 2As shown, the addition of the spring portion 55 and the swing portion 54 enables the outer rubber layer 4 to actively approach the middle buffer layer 3 under the action of external force, thereby reducing the gap between the two, ensuring that stress can be transmitted continuously and evenly, and avoiding the interruption of stress transmission caused by the stiffness mutation interface. When the pipe is subjected to liquid impact force, the spring portion 55 can provide an additional force to help the outer rubber layer 4 quickly approach the middle buffer layer 3, thereby reducing the impact of the impact force on the pipe structure. This design effectively improves the pipe's resistance to impact loads. The stress transition device 5 formed by the first sliding portion 51, the second sliding portion 52, the support portion 53, the swing portion 54, the spring portion 55 and the limit portion 56 solves the stiffness mutation problem between the low-rigidity buffer layer and the high-rigidity outer rubber layer 4 in the traditional design, thereby improving the performance and reliability of the pipe.

[0031] At present, the performance of existing high-strength steel wire wrapped reinforced pipe fittings faces severe challenges when used in fire protection pipe systems. Fire protection pipes not only need to withstand the continuous impact of high-pressure water flow for a long time, but also need to cope with instantaneous high-pressure fluctuations and high-frequency vibrations under extreme working conditions during emergency rescue. Under the action of such dynamic loads, the modulus difference between the intermediate buffer layer 3 and the outer rubber layer 4 is significantly amplified: the low-rigidity buffer layer and the high-rigidity outer rubber layer 4 form a stiffness mutation interface, resulting in the interruption of the stress transfer path. Specifically, the impact force generated by the high-pressure fluctuation forms stress concentration at the interface, while the energy reflection caused by the high-frequency vibration causes a local stress wave superposition effect. This dual effect makes the interface bonding area a structural weak link, which is very likely to cause interlayer delamination, microcrack expansion and even fatigue fracture of the steel wire layer, seriously weakening the overall strength and service life of the pipe fittings.

[0032] In order to solve the above problems, in this embodiment, when high-strength steel wire wrapped reinforced pipe fittings are used in fire protection pipe systems, when high-pressure water flow impacts the inner rubber layer 1, the first sliding part 51 cooperates with the spring part 55 along the axial displacement of the guide rail mentioned below to form a first-level buffer, converting the peak impact force into elastic potential energy; when the pressure fluctuation triggers the limit part 56, the arc-shaped outer edge of the swing rod contacts the baffle rod to produce a lever effect, forcing the second sliding part 52 to displace in the opposite direction, converting the rigid stress borne by the outer rubber layer 4 into a flexible deformation of the middle buffer layer 3, effectively eliminating the stiffness mutation interface, and the device improves the stress transfer continuity between the middle buffer layer 3 and the outer rubber layer 4, and at the same time utilizes the multi-directional displacement compensation mechanism under the constraint of the guide rail to reduce the reflectivity of high-frequency vibration energy, fundamentally solving the problem of the low-rigidity buffer layer and the high-rigidity outer rubber layer 4 forming a stiffness mutation interface, resulting in the interruption of the stress transfer path.

[0033] Since the high-strength steel wire wrapped reinforced pipe is used in a fire protection pipe system, and the fire protection pipe not only needs to withstand the continuous impact of high-pressure water flow for a long time, but also needs to cope with instantaneous high-pressure fluctuations and high-frequency vibrations under extreme working conditions during emergency rescue, there may be a relative offset between the first sliding part 51 and the second sliding part 52. In order to avoid the relative offset between the first sliding part 51 and the second sliding part 52, in one embodiment, the support part 53 is further provided with guide rails that cooperate with the first sliding part 51 and the second sliding part 52, respectively. In addition, the two guide rails that cooperate with the first sliding part 51 and the second sliding part 52 are fixed together, so that the first sliding part 51, the second sliding part 52 and the two guide rails are limited together, and the first sliding part 51 and the second sliding part 52 can only slide in parallel without relative offset.

[0034] It is worth mentioning that when the pressure fluctuation triggers the limit part 56, the arc-shaped outer edge of the swing rod contacts the stop rod to produce a lever effect, forcing the second sliding part 52 to move in the opposite direction. However, the reverse displacement of the second sliding part 52 cannot be unlimited. Since the instantaneous high-pressure fluctuation and high-frequency vibration in the fire pipe are not easy to monitor, if it is an emergency, the instantaneous high-pressure fluctuation may force the second sliding part 52 to move in the opposite direction for a long distance, which will cause the spring to be over-compressed and exceed the deformation, thereby damaging the spring. In order to avoid this problem, in one embodiment, a stop rod is vertically provided on the other end of the first sliding part 51, and the stop rod is perpendicular to the swing part 51. 54 can fit together, the swinging part 54 is a swinging rod, the two ends of the swinging rod are hinged to the first sliding part 51 and the second sliding part 52 respectively, the swinging rod between the first sliding part 51 and the second sliding part 52 is rotatably set on the support part 53, and the outer edge of the swinging rod is an arc structure, the arc structure and the baffle can fit together, the existence of the baffle and the limiting part 56 can not only make the second sliding part 52 reverse displacement but also avoid emergency situations. Instantaneous high-pressure fluctuations may force the second sliding part 52 to reverse displacement too far, which will cause the spring to be over-compressed and exceed the deformation. At the same time, the arc structure can also avoid frequent movement causing wear of the baffle.

[0035] In order to make high-strength steel wire wrapped reinforced pipes better used in fire protection pipes, in one embodiment, the number of stress transition devices 5 is greater than or equal to four, and the stress transition devices 5 are arranged at equal intervals. The gap between the intermediate buffer layer 3 and the outer rubber layer 4 outside the stress transition device 5 is filled with closed-cell foam elastomer or flexible polyurethane composite material. The steel wire reinforcement layer 2 is a high-strength steel wire made of high-carbon steel or stainless steel. The surface of the outer rubber layer 4 is coated with an anti-corrosion coating. The equally spaced stress transition devices 5 form an annular stress transfer matrix, so that the impact force is evenly dispersed along the circumference. Combined with the secondary buffering of the closed-cell foam elastomer, stress concentration can be further reduced. The dynamic loss factor of the closed-cell foam elastomer in the filling material forms a composite damping system with the stress transition device 5, which reduces the reflectivity of high-frequency vibration energy and avoids the superposition effect of stress waves at the interface. In addition, the composite application of high-carbon steel wire and stainless steel, combined with the anti-corrosion coating, improves the fatigue life of the steel wire layer under dynamic load.

[0036] A method for using a high-strength steel wire wound reinforced pipe fitting comprises the following steps:

[0037] S1: Before installation, check the mechanical structural integrity of the pipe fitting and confirm that the swinging portion 54 of the stress transition device 5 has a rotational freedom of ≥30°, the clearance between the first sliding portion 51 and the guide rail is ≤0.2mm, and the pre-compression amount of the spring portion 55 is 10%-15% of the free length. The swinging portion 54 has a rotational freedom of ≥30° to ensure a dynamic compensation range, and the 0.2mm guide rail clearance is controlled to avoid motion jamming, ensuring a circumferential stress distribution uniformity of over 95%, eliminating the risk of interlayer delamination caused by eccentric loads.

[0038] S2: Ensure uniform circumferential stress distribution between the outer rubber layer 4 and the intermediate buffer layer 3;

[0039] S3: When fluid is introduced, the pressure in the tube causes the first sliding portion 51 to displace axially along the guide rail of the support portion 53. Simultaneously, the spring portion 55 is compressed to more than half of its designed stroke, triggering the limiter 56. The limiter 56 is triggered when the spring is compressed to half, achieving displacement compensation through a 1:1.2-1.5 leverage ratio, reducing the amplitude of interface stress fluctuations and meeting the requirements of the fire protection system for instantaneous pressure fluctuations.

[0040] S4: When the pressure fluctuates, the contact between the blocking rod and the arc surface of the swing rod produces a lever effect, forcing the second sliding part 52 to move in the opposite direction along the guide rail to compensate for the displacement, thereby achieving dynamic stress balance between the intermediate buffer layer 3 and the outer rubber layer 4;

[0041] S5: During periodic maintenance, measure the residual compression stroke of the spring part 55. If the rebound margin is less than half of the initial value, replace the hinge shaft of the swing part 54 simultaneously, detect the wear amount of the guide rail working surface, and perform repair processing.

[0042] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make some changes or modifications to equivalent embodiments using the technical contents disclosed above. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A high-strength steel wire wound reinforced pipe, characterized in that: The invention relates to a pipe fitting according to claim 1, wherein the first and second sliding portions are connected to each other, and the second and third sliding portions are connected to each other, respectively. The first and second sliding portions are connected to each other by a spring, and the spring is connected to the first and second sliding portions respectively. The first and second sliding portions are connected to each other by a spring, and the spring is connected to the first and second sliding portions respectively. On the supporting part between the rubber layers, the two ends of the spring part are respectively connected to the other end of the first sliding part and the outer rubber layer, and the liquid impact force in the entire pipe drives the first sliding part to squeeze the spring part, and the limiting part is fitted with the first sliding part to drive the swinging part to swing, and the swinging part drives the second sliding part to move in the direction close to the middle buffer layer, so that the stress between the middle buffer layer and the outer rubber layer is continuously transmitted; a baffle rod is vertically arranged on the other end of the first sliding part, and the baffle rod can be fitted with the swinging part, and the swinging part is a swing rod, and the two ends of the swing rod are respectively hinged to the first sliding part and the second sliding part, and the swing rod between the first sliding part and the second sliding part is rotatably set on the supporting part, and the outer edge of the swing rod is an arc structure, and the arc structure can be fitted with the baffle rod.

2. A high-strength steel wire wound reinforced pipe according to claim 1, characterized in that: The support parts are also provided with guide rails respectively cooperating with the first sliding part and the second sliding part.

3. The high-strength steel wire wound reinforced pipe according to claim 1, characterized in that: The number of the stress transition devices is greater than or equal to four, and the stress transition devices are arranged at equal intervals.

4. A high-strength steel wire wound reinforced pipe according to claim 3, characterized in that: The gap between the intermediate buffer layer and the outer rubber layer outside the stress transition device is filled with a closed-cell foam elastomer or a flexible polyurethane composite material.

5. The high-strength steel wire wound reinforced pipe according to claim 1, characterized in that: The steel wire reinforcement layer is high-strength steel wire made of high-carbon steel or stainless steel.

6. The high-strength steel wire wound reinforced pipe according to claim 1, characterized in that: The surface of the outer rubber layer is coated with an anti-corrosion coating.

7. A method for using a high-strength steel wire wound reinforced pipe fitting, based on the high-strength steel wire wound reinforced pipe fitting according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1: Before installation, check the mechanical integrity of the pipe fittings, confirm that the swinging part of the stress transition device has a rotational freedom of ≥30°, the clearance between the first sliding part and the guide rail is ≤0.2mm, and the pre-compression of the spring part is 10%-15% of the free length; S2: Ensure uniform circumferential stress distribution between the outer rubber layer and the intermediate buffer layer; S3: When the fluid is introduced, the pressure in the tube causes the first sliding part to produce axial displacement along the guide rail of the support part, and at the same time, the spring part is compressed to more than half of the designed stroke, triggering the limit part; S4: When the pressure fluctuates, the contact between the blocking rod and the arc surface of the swing rod produces a lever effect, forcing the second sliding part to move in the opposite direction along the guide rail to compensate for the displacement, thus achieving dynamic stress balance between the intermediate buffer layer and the outer rubber layer; S5: During periodic maintenance, measure the residual compression stroke of the spring part. If the rebound margin is less than half of the initial value, replace the swing part hinge shaft simultaneously, check the wear of the guide rail working surface, and perform repair processing.

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