High pressure bearing type outer coated plastic stainless steel pipe

Abstract

The utility model discloses a high pressure bearing type outer covering plastic stainless steel pipe belongs to stainless steel pipe field. Including stainless steel inner layer, transition reinforcing layer and outer covering plastic layer that distribute gradually from inside to outside, this stainless steel pipe stainless steel inner layer as main bearing structure, with its higher strength and rigidity, can bear the pressure of internal fluid, keep the shape stability of stainless steel pipe, the glass fiber reinforced plastic in transition reinforcing layer has good compression resistance, fills between stainless steel inner layer and outer covering plastic layer, can disperse and deliver pressure, reduces local stress concentration, when stainless steel pipe is under pressure, vertical main rod can have certain deformation under the action of external force, but the elasticity of first horizontal spring rod and second horizontal spring rod can absorb part pressure, the cooperation of vertical plugging plate and recess and the sliding connection of sliding block and annular block simultaneously, ensure that the connection between each layer will not loosen because of pressure, thereby jointly realize high pressure bearing capacity.

Description

Technical Field

[0001] This utility model relates to the field of stainless steel pipe technology, specifically to a high-pressure-bearing stainless steel pipe with an outer plastic coating. Background Technology

[0002] Plastic-coated stainless steel pipes have a plastic coating layer on the outer surface of the stainless steel pipe, which acts as an isolation and waterproof layer, preventing the external environment from affecting the performance of the stainless steel pipe. The plastic coating layer of plastic-coated stainless steel water pipes has the characteristics of wear resistance, corrosion resistance, and heat insulation, and is widely used in various pipeline projects, hot and cold water pipes, underground wall pipes, and pipes exposed to corrosive environments. In order to ensure the safety of residents' drinking water, the demand for energy-saving, safe, environmentally friendly, and hygienic water supply pipes is growing rapidly. However, galvanized iron pipes have the problem of rust, which can cause secondary pollution of drinking water. Plastic water supply pipes have poor physical and mechanical properties such as rigidity, strength, toughness, and creep resistance, and cannot meet the purpose of long-term use. Therefore, plastic-coated stainless steel pipes have become the preferred pipe fittings.

[0003] When using existing plastic-coated stainless steel pipes, the outer plastic coating layer and the inner stainless steel layer may only be fixed by simple adhesive or mechanical clamping. Under high pressure, the layers are prone to loosening due to uneven stress, leading to the failure of the overall structure. When the fluid pressure rises sharply, the internal stress of the pipe cannot be released, which may cause the connection to break or the overall structure to collapse. Utility Model Content

[0004] To address the aforementioned problems, this utility model discloses a high-pressure-bearing, externally coated stainless steel pipe.

[0005] The technical solution of this utility model is: a high pressure-bearing external plastic-coated stainless steel pipe, comprising an inner stainless steel layer, a transition reinforcing layer and an outer plastic coating layer distributed sequentially from the inside to the outside;

[0006] The outer wall of the stainless steel inner layer is provided with several connecting seats, the inner wall of the connecting seat is provided with an annular block, and the inner wall of the annular block is provided with several notches along the circumference; the outer plastic coating layer is provided with several pressing clips that correspond one-to-one with the connecting seats and are distributed relatively; the transition reinforcement layer is filled between the stainless steel inner layer and the outer plastic coating layer.

[0007] The pressing mechanism includes a vertical main rod with several first horizontal spring rods arranged circumferentially on its outer wall, and several second horizontal spring rods arranged at the bottom of the vertical main rod and distributed opposite to each other. The free ends of the second horizontal spring rods are provided with vertical sealing plates.

[0008] Furthermore, the height of the vertical sealing plate is greater than the inner diameter of the notch, and the upper end of the vertical sealing plate is slidably connected to the bottom end of the annular block via a sliding block.

[0009] Explanation: The height of the vertical sealing plate is limited to be greater than the inner diameter of the notch. The purpose is to prevent the second horizontal spring rod from entering the notch, so that it moves downward to the bottom of the annular block and slides to connect with the bottom of the annular block. It also works with the first horizontal spring rod to form a double fixation, thereby improving the tightness of the connection between the various components inside the pressing clip.

[0010] Furthermore, several recesses are provided between the outer wall of the stainless steel inner layer and the inner wall of the outer plastic coating layer, and the transition reinforcement layer is made of fiberglass filling the space between the stainless steel inner layer and the outer plastic coating layer.

[0011] Explanation: The function of the concave holes is to form mechanical interlocking points between the inner stainless steel layer and the outer plastic coating layer. When the fiberglass of the transition reinforcement layer fills the concave holes, it can significantly enhance the bonding force between the inner stainless steel layer, the transition reinforcement layer and the outer plastic coating layer, effectively preventing interlayer peeling. At the same time, the fiberglass, with its high compressive strength and shear strength, can effectively transmit and disperse the pressure inside the pipe, improving the overall pressure bearing capacity of the stainless steel pipe.

[0012] Furthermore, the fiberglass of the transition reinforcement layer contains helically wound carbon fiber bundles.

[0013] Note: Carbon fiber bundles have extremely high tensile strength and elastic modulus. When embedded in fiberglass, they can significantly improve the mechanical properties of the transition reinforcement layer, increasing both the axial and circumferential tensile strength. At the same time, they can also improve the fatigue resistance of stainless steel pipes and ensure their service life.

[0014] Furthermore, a sealing plug is provided at the bottom of the outer plastic coating and at the top of each vertical main rod. The sealing plug is located on the inner wall of the annular block and abuts against it. The length of the vertical main rod is greater than the height of the annular block.

[0015] Description: The sealing plug is made of elastic silicone material and is cylindrical. Its outer diameter matches the inner diameter of the annular block, allowing it to fit tightly against the inner wall of the annular block and provide a seal. This improves the tightness of the connection between the various components inside the pressing clip and effectively prevents peeling between the stainless steel inner layer and the transition reinforcement layer. By limiting the relationship between the length of the vertical main rod and the height of the annular block, it ensures that the second horizontal spring rod can move to the bottom of the annular block and slide to connect with it, thus forming a double fixation and improving reliability.

[0016] The beneficial effects of this utility model are:

[0017] In use, the high-pressure-bearing, externally coated stainless steel pipe of this invention utilizes the stainless steel inner layer as the primary load-bearing structure. Its high strength and rigidity allow it to withstand the pressure of the internal fluid, maintaining the pipe's shape stability. The fiberglass in the transition reinforcement layer, possessing excellent compressive strength, fills the space between the stainless steel inner layer and the external plastic coating, dispersing and transmitting pressure and reducing localized stress concentration. Furthermore, the embedded spirally wound carbon fiber bundles, with their high strength and high modulus, further enhance the transition reinforcement layer's resistance to deformation, making the entire stainless steel pipe less prone to bending or twisting under high pressure. The external coating... The plastic layer not only protects the internal structure, but also connects with the stainless steel inner layer through the connection seat and the pressing clip, forming a whole and enhancing the integrity and stability of the stainless steel pipe. The structural design of the pressing clip is particularly critical. When the stainless steel pipe is under pressure, the vertical main rod may deform under external force, but the elasticity of the first and second horizontal spring rods can absorb part of the pressure. At the same time, the cooperation between the vertical sealing plate and the notch, as well as the sliding connection between the sliding block and the ring block, ensure that the connection between the layers will not loosen due to pressure, thus achieving a high pressure resistance. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the external structure of this utility model;

[0019] Figure 2 This is a cross-sectional view of the present invention;

[0020] Figure 3 This is a schematic diagram of the press-fit mechanism of this utility model.

[0021] Among them, 1-stainless steel inner layer, 10-connecting seat, 11-ring block, 12-notch, 2-transition reinforcing layer, 21-carbon fiber bundle, 3-outer plastic coating layer, 30-pressing clip, 31-first horizontal spring rod, 32-vertical main rod, 33-second horizontal spring rod, 330-vertical sealing plate, 331-sliding block, 34-sealing plug, 4-recessed hole. Detailed Implementation

[0022] Example 1: As Figure 1 , 2 As shown in Figures 1 and 3, a high-pressure-bearing externally plastic-coated stainless steel pipe includes an inner stainless steel layer 1, a transition reinforcing layer 2, and an outer plastic-coated layer 3 distributed sequentially from the inside to the outside.

[0023] The outer wall of the stainless steel inner layer 1 is provided with 25 connecting seats 10, the inner wall of the connecting seat 10 is provided with an annular block 11, and the inner wall of the annular block 11 is provided with 4 notches 12 along the circumference; the outer plastic coating layer 3 is provided with 25 pressing clips 30 that correspond one-to-one with the connecting seats 10 and are distributed in opposite directions; the transition reinforcing layer 2 is filled between the stainless steel inner layer 1 and the outer plastic coating layer 3.

[0024] The pressing clip 30 includes a vertical main rod 32 with four first horizontal spring rods 31 arranged circumferentially on the outer wall, and four second horizontal spring rods 33 arranged at the bottom of the vertical main rod 32 and distributed relatively to each other. The free end of the second horizontal spring rods 33 is provided with a vertical sealing plate 330.

[0025] The height of the vertical sealing plate 330 is 1.5 times the inner diameter of the recess 12, and the upper end of the vertical sealing plate 330 is slidably connected to the bottom end of the annular block 11 through the sliding block 331. The purpose of limiting the height of the vertical sealing plate 330 to 1.5 times the inner diameter of the recess 12 is to prevent the second horizontal spring rod 33 from entering the recess 12, so that it moves downward to the bottom end of the annular block 11 and is slidably connected to the bottom end of the annular block 11. It also works with the first horizontal spring rod 31 to form a double fixation, thereby improving the tightness of the connection between the various components inside the pressing clip 30.

[0026] Eighty recesses 4 are provided between the outer wall of the stainless steel inner layer 1 and the inner wall of the outer plastic coating layer 3. The transition reinforcement layer 2 is made of fiberglass filled between the stainless steel inner layer 1 and the outer plastic coating layer 3. The function of the recesses 4 is to form mechanical interlocking points between the stainless steel inner layer 1 and the outer plastic coating layer 3. When the fiberglass of the transition reinforcement layer 2 fills the recesses 4, it can significantly enhance the bonding force between the stainless steel inner layer 1, the transition reinforcement layer 2 and the outer plastic coating layer 3, effectively preventing interlayer peeling. At the same time, the fiberglass can effectively transmit and disperse the pressure inside the pipe through its high compressive strength and shear strength, thereby improving the overall pressure bearing capacity of the stainless steel pipe. The fiberglass can be made using existing technology, and this application does not protect its composition.

[0027] The fiberglass of the transition reinforcement layer 2 is embedded with spirally wound carbon fiber bundles 21. The carbon fiber bundles 21 have extremely high tensile strength and elastic modulus. After being embedded in the fiberglass, they can significantly improve the mechanical properties of the transition reinforcement layer 2. The axial tensile strength and circumferential tensile strength of the transition reinforcement layer 2 are improved. At the same time, it can also improve the fatigue resistance of the stainless steel pipe and ensure its service life. The carbon fiber bundles 21 adopt existing technology.

[0028] A sealing plug 34 is provided at the bottom of the outer plastic coating layer 3 and at the top of each vertical main rod 32. The sealing plug 34 is located on the inner wall of the annular block 11 and abuts against it. The length of the vertical main rod 32 is 1.2 times the height of the annular block 11. The sealing plug 34 is made of elastic silicone material and is cylindrical. Its outer diameter matches the inner diameter of the annular block 11, so that it can fit tightly against the inner wall of the annular block 11 and play a sealing role. This improves the tightness of the connection between the various components inside the pressing clip 30 and effectively prevents the peeling between the stainless steel inner layer 1 and the transition reinforcing layer 2. By limiting the relationship between the length of the vertical main rod 32 and the height of the annular block 11, it ensures that the second horizontal spring rod 33 can move to the bottom of the annular block 11 and slide to connect with its bottom end, thereby forming a double fixation and improving reliability.

[0029] During installation, the stainless steel inner layer 1 and the outer plastic coating layer 3 of this utility model are connected by the corresponding engagement of the connecting seat 10 and the pressing clip 30. That is, the vertical main rod 32 is inserted into the connecting seat 10. During the insertion process, the first horizontal spring rod 31 and the second horizontal spring 33 are compressed and move downward along the inner wall of the annular block 11. Since the height of the vertical sealing plate 330 is greater than the inner diameter of the recess 12, when the second horizontal spring 33 passes through the recess 12, it is blocked by the vertical sealing plate 330. When the first horizontal spring rod 31 passes through the recess 12, its elasticity is restored and it is inserted into the recess 12 for the first engagement. When the second horizontal spring rod 33 moves downward to the bottom of the annular block 11, the sliding block 331 at the upper end of the vertical sealing plate 330 is slidably connected to the bottom of the annular block 11 and forms a double fixation with the first horizontal spring rod 31.

Claims

1. A high-pressure-bearing, externally plastic-coated stainless steel pipe, characterized in that, It includes a stainless steel inner layer (1), a transition reinforcement layer (2), and an outer plastic coating layer (3) distributed from the inside out; The stainless steel inner layer (1) has several connecting seats (10) on its outer wall, and the connecting seat (10) has an annular block (11) on its inner wall. The annular block (11) has several recesses (12) along its circumferential direction on its inner wall. The outer plastic coating layer (3) has several pressing clips (30) that correspond one-to-one with the connecting seats (10) and are distributed relatively. The transition reinforcement layer (2) is filled between the stainless steel inner layer (1) and the outer plastic coating layer (3). The pressing clip (30) includes a vertical main rod (32) with several first horizontal spring rods (31) arranged circumferentially on the outer wall, and several second horizontal spring rods (33) arranged at the bottom end of the vertical main rod (32) and distributed relatively to each other. The free end of the second horizontal spring rod (33) is provided with a vertical sealing plate (330).

2. The high-pressure-bearing, externally coated stainless steel pipe according to claim 1, characterized in that, The height of the vertical sealing plate (330) is greater than the inner diameter of the notch (12), and the upper end of the vertical sealing plate (330) is slidably connected to the bottom end of the annular block (11) through a sliding block (331).

3. The high-pressure-bearing plastic-coated stainless steel pipe according to claim 1, characterized in that, Several recesses (4) are provided between the outer wall of the stainless steel inner layer (1) and the inner wall of the outer plastic coating layer (3). The transition reinforcement layer (2) is made of fiberglass filling the space between the stainless steel inner layer (1) and the outer plastic coating layer (3).

4. The high-pressure-bearing plastic-coated stainless steel pipe according to claim 1, characterized in that, The transition reinforcement layer (2) is embedded with spirally wound carbon fiber bundles (21) in the fiberglass.

5. A high-pressure-bearing, externally coated stainless steel pipe according to claim 1, characterized in that, A sealing plug (34) is provided at the bottom of the outer plastic coating layer (3) and at the upper end of each vertical main rod (32). The sealing plug (34) is located on the inner wall of the annular block (11) and abuts against it. The length of the vertical main rod (32) is greater than the height of the annular block (11).

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