Glass reinforced plastic pipe coupling joint

Abstract

The application discloses a glass fiber reinforced plastic pipe joint, and relates to the technical field of pipe joints, which comprises a first half ring and a second half ring, a sealing air bag arranged on the inner side of the first half ring and the second half ring and used for forming sealing on the butt joint part of the glass fiber reinforced plastic pipe, and a sealing auxiliary device arranged between the first half ring, the second half ring and the sealing air bag and used for supplying hydraulic pressure to the inside of the sealing air bag to form sealing operation. The fixing shell with the first partition plate, the adjusting screw rod, the second piston plate and the flow pipe are arranged to separate the active oil supply cavity and the temperature compensation oil storage cavity into two independent cavity structures, the hydraulic oil can be manually and accurately controlled to be delivered, the sealing air bag is driven to expand to realize full coverage and tight sealing of the butt joint gap of the pipe, the temperature self-adapting stable pressure compensation capacity is simultaneously achieved, and the problems of uneven sealing pressure of the traditional pipe joint and easy damage to the glass fiber reinforced plastic pipe wall are solved.

Description

Technical Field

[0001] This invention relates to the field of pipe clamp technology, and more particularly to a fiberglass pipe clamp. Background Technology

[0002] Fiberglass reinforced plastic (FRP) pipes, with their advantages of corrosion resistance, light weight, high strength, and aging resistance, are widely used in water supply and drainage, chemical, and municipal fluid transportation. The pipe clamp sealing joints at pipe joints are the core components ensuring the overall sealing performance of the pipeline. Currently, most FRP pipe joint clamps on the market adopt a traditional rigid compression structure, relying on the clamp bolts to tighten and compress the built-in rubber sealing gasket, achieving sealing of the pipe joint gap through purely mechanical compression. This type of compression sealing structure is simple and versatile, but the overall sealing method is singular, lacking self-adjusting capability. It can only rely on manual mechanical pre-tightening force to achieve a fixed compression seal, resulting in extremely poor adaptability to operating conditions and difficulty in meeting the sealing requirements of pipelines under complex conditions.

[0003] Traditional compression-type pipe clamp seals rely entirely on the mechanical pressure of bolt tightening for sealing, making precise pressure control impossible. The pre-tightening pressure depends entirely on the operator's experience, easily leading to excessive or insufficient pressure. Insufficient pressure results in poor adhesion between the gasket and pipe wall, causing initial leakage. Excessive pressure can damage brittle fiberglass pipe walls, causing delamination, chipping, and cracking, while also causing long-term overpressure deformation of the rubber gasket, accelerating aging and failure. Furthermore, traditional compression-type seals lack any temperature-adaptive compensation mechanism. Under alternating ambient and pipe medium temperatures, the rubber gasket is prone to thermal creep and cold contraction, which, combined with pipe deformation, easily leads to seal loosening. The absence of a hydraulic oil temperature compensation system fails to compensate for temperature variations in the sealing gap, making leakage likely under both high and low temperature conditions.

[0004] In addition, traditional integral sealing gaskets are passive compression seals, lacking zone adaptation and pressure regulation functions. They are poorly adaptable to inherent problems in FRP pipes, such as pipe end roundness deviations, uneven pipe wall fiber textures, and uneven local temperature differences, easily creating localized through-leakage channels. Furthermore, this type of passive sealing structure cannot compensate for seal misalignment caused by pipeline vibration and medium pressure pulsation. Over long-term operation, the sealing gap continues to widen, significantly reducing sealing stability, resulting in a short service life and high failure rate. It cannot meet the sealing requirements of FRP pipes under long-term, stable, wide-temperature-range, and complex operating conditions. Summary of the Invention

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0006] In view of the problems existing in the current fiberglass pipe coupling, the present invention is proposed.

[0007] Therefore, the purpose of this invention is to provide a fiberglass pipe clamp joint that solves the problems of traditional fiberglass pipe hydraulic clamps, which adopt a single-cavity integrated structure without functional partitioning, making it impossible to achieve precise manual pressure control and oil supply, resulting in poor sealing pre-tightening accuracy and uneven sealing pressure distribution. Simultaneously, it addresses the technical problems of traditional structures lacking independent temperature compensation and pressure stabilization capabilities, where thermal expansion and contraction of hydraulic oil easily leads to high-temperature overpressure damage to the fiberglass pipe wall and sealing bladder, low-temperature pressure decay causing sealing leakage, poor temperature adaptability, and unsatisfactory sealing stability.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a fiberglass pipe coupling joint, the device comprising: The first half-ring and the second half-ring; A sealing airbag is disposed inside the first half-ring and the second half-ring to form a seal at the joint of the fiberglass pipe. A sealing aid, located between the first half-ring, the second half-ring, and the sealing airbag, is used to supply hydraulic pressure into the interior of the sealing airbag to form a sealing operation. The sealing aid includes a fixed shell that is fixedly connected to the inner sides of the first half-ring and the second half-ring, and the inner side of the fixed shell is separated by a first partition to form two cavities. One of the cavities is used for oil supply, and the other cavity is used to expand and collect the hydraulic oil inside the sealing airbag when the hydraulic oil is affected by temperature.

[0009] As a preferred embodiment of the fiberglass pipe clamp joint of the present invention, the sealing auxiliary device further includes a second piston plate slidably connected to the inner side of the diaphragm, an adjusting screw is threadedly connected to one side of the fixed shell, and one end of the adjusting screw passes through the inner side of the fixed shell and is rotatably connected to the second piston plate. A flow pipe is installed at the oil inlet of the sealing airbag, and the flow pipe communicates with the interior of one of the diaphragms.

[0010] As a preferred embodiment of the fiberglass pipe clamp joint of the present invention, the inner side of the sealing airbag is fixedly connected with multiple sets of elastic teeth, the multiple sets of elastic teeth are distributed at equal distances around the inner side of the sealing airbag, and the elastic teeth are trapezoidal.

[0011] As a preferred embodiment of the fiberglass pipe clamp joint of the present invention, wherein: every two elastic teeth are staggered to form a labyrinth seal.

[0012] In a preferred embodiment of the fiberglass pipe coupling joint described in this invention, a pressure regulator for absorbing thermal expansion is provided inside the cavity. The pressure regulator includes a first piston plate slidably connected to the inside of another compartment. A connecting spring is installed between the first piston plate and the compartment. The outlet of the sealing airbag is connected to the inside of the other compartment through a second one-way valve, and the inlet of the sealing airbag is connected to the inside of the other compartment through a first one-way valve.

[0013] As a preferred embodiment of the fiberglass pipe clamp joint of the present invention, the flow diameter of the second check valve is larger than that of the first check valve, so that the hydraulic oil can be quickly discharged when heated and expanded, and a slow oil supply is formed during the return flow process.

[0014] As a preferred embodiment of the fiberglass pipe clamp joint of the present invention, the sealing airbag is internally fixedly connected with multiple diaphragms, and the multiple diaphragms divide the internal space of the sealing airbag into multiple compensation cavities.

[0015] As a preferred embodiment of the fiberglass pipe clamp joint of the present invention, a plurality of second partitions are fixedly connected to the inner side of the fixed shell, and the plurality of first piston plates are divided into a plurality of compensation cavities by the second partitions.

[0016] As a preferred embodiment of the fiberglass pipe clamp joint of the present invention, the area divided by the diaphragm corresponds to the area divided by the second partition, so that the thermal expansion of the sealing airbag during local heating will not affect other areas.

[0017] In a preferred embodiment of the fiberglass pipe clamp joint of the present invention, the first half-ring and the second half-ring are hinged together by a rotating rod. A rotating seat is rotatably connected to the inner side of the first half-ring. A threaded rod is fixedly connected to the top of the rotating seat, and a nut is threaded onto the outer wall of the threaded rod.

[0018] The beneficial effects of this invention are: This invention, by setting up a fixed shell with a first partition, an adjusting screw, a second piston plate, and a flow pipe, forms a dual independent cavity structure of an active oil supply cavity and a temperature-compensated oil storage cavity. The hydraulic oil delivery can be precisely controlled manually, and the sealing airbag can be expanded to achieve full coverage and tight sealing of the pipe joint gap. At the same time, it has the ability to adapt to temperature and stabilize pressure, effectively solving the problems of uneven pressure and easy damage to the fiberglass pipe wall of traditional pipe clamp seals.

[0019] This invention constructs a three-dimensional tortuous labyrinth sealing structure by setting trapezoidal elastic teeth that are equidistantly staggered on the inner side of the sealing airbag. This structure can adaptively fit the microscopic concavity and roundness deviation of the FRP pipe opening, eliminate through-type leakage channels, disperse sealing contact stress, increase the friction of the sealing interface, effectively resist the sealing displacement caused by pipeline vibration and medium pulsation, and significantly improve the sealing stability and durability.

[0020] This invention forms an asymmetric hydraulic regulation logic by setting up a pressure regulator consisting of a first check valve, a second check valve and a first piston plate with a connecting spring, with different orifice diameters. This logic enables rapid oil discharge from a large orifice and slow oil return from a small orifice. It can passively and adaptively offset the pressure fluctuations caused by the thermal expansion and contraction of hydraulic oil, avoid overpressure damage to the high-temperature airbag and leakage due to pressure decay in low-temperature seals, and adapt to complex working conditions in a wide temperature range.

[0021] This invention sets up multiple diaphragms to separate the internal space of the sealing airbag and multiple second diaphragms to separate the compensation cavity, so that the independent sealing area of ​​the airbag and the independent partition of the compensation cavity correspond one-to-one, forming multiple independent temperature and pressure compensation units. This enables local heated areas to independently and adaptively release and replenish pressure, eliminating the problems of miscompensation of pressure across the whole area and circumferential sealing off-center load caused by local temperature differences, and adapting to non-uniform temperature conditions. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein: Figure 1 This is a schematic diagram of the structure of the present invention.

[0023] Figure 2 For the present invention Figure 1 Enlarged view of point A in the middle.

[0024] Figure 3 This is a cross-sectional view of the first and second semi-rings of the present invention.

[0025] Figure 4 This is a cross-sectional view of the fixed shell of the present invention.

[0026] Figure 5 For the present invention Figure 4 Enlarged view of section B in the middle.

[0027] Figure 6 This is an exploded view of the fixed shell, the second piston plate, and the sealing airbag of the present invention.

[0028] Figure 7 This is a cross-sectional view of the sealing airbag of the present invention.

[0029] Figure 8 This is a schematic diagram of the inner structure of the fixed shell of the present invention.

[0030] In the diagram: 1. First half-ring; 2. Second half-ring; 3. Sealing airbag; 4. Elastic tooth; 5. Rotating rod; 6. Threaded rod; 7. Nut; 8. Rotating seat; 9. Fixed shell; 10. Adjusting screw; 11. First piston plate; 12. Connecting spring; 13. First check valve; 14. Second check valve; 15. First partition plate; 16. Second piston plate; 17. Flow pipe; 18. Diaphragm; 19. Chamber; 20. Second partition plate. Detailed Implementation

[0031] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0032] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0033] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0034] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0035] Reference Figures 1-8This invention provides a fiberglass pipe clamp joint, suitable for the sealing installation of fiberglass pipes. It features manually controllable pre-tightening sealing, temperature-adaptive hydraulic compensation, and strong adaptability to various operating conditions. The overall structure includes a first half-ring 1, a second half-ring 2, a sealing airbag 3, and a sealing auxiliary device. The first half-ring 1 and the second half-ring 2 are hinged together by a rotating rod 5, allowing for open-close installation. This enables quick snap-fitting onto the outside of the joint between two sets of fiberglass pipes, facilitating assembly and strong adaptability. A rotating seat 8 is rotatably connected to the inner side of the first half-ring 1. A threaded rod 6 is fixedly installed on the top of the rotating seat 8, and a nut 7 is threaded onto the outer wall of the threaded rod 6. Through the threaded locking engagement of the threaded rod 6 and the nut 7, the first half-ring 1 and the second half-ring 2 can be closed and fixed, completing the overall positioning and installation of the clamp. The locking structure is stable and reliable, effectively preventing the clamp from loosening or shifting during pipeline operation. Sealing airbags 3 are embedded on the inner sides of both the first half-ring 1 and the second half-ring 2. These airbags 3 fit snugly against the outer side of the fiberglass pipe joint, serving as the core sealing component. Through expansion and deformation, they conform to the outer wall of the pipe, achieving a complete seal of the joint and blocking the leakage of the pipe medium. To achieve controllable expansion and adaptive pressure-stabilized sealing of the sealing airbags 3, a sealing auxiliary device is installed between the first half-ring 1, the second half-ring 2, and the sealing airbags 3. This auxiliary device precisely supplies hydraulic oil to the sealing airbags 3, driving them to expand and complete the sealing operation. Simultaneously, it can adaptively adjust the internal hydraulic pressure according to changes in environmental and medium temperature, ensuring long-term sealing stability. The sealing auxiliary device includes a fixed shell 9 fixedly connected to the inner sides of the first half-ring 1 and the second half-ring 2. The interior of the fixed shell 9 is divided into two independent cavities 19 by a first partition 15. The two cavities 19 have clear functional divisions and do not interfere with each other. One cavity 19 is an active oil supply cavity, used to complete the manual oil injection operation. The other cavity 19 is a temperature compensation oil storage cavity, which can complete the expansion and pressure stabilization compensation of hydraulic oil when it expands and contracts due to temperature, and realize temperature adaptive sealing regulation. An adjusting screw 10 is threadedly connected to the outside of the fixed shell 9. The end of the adjusting screw 10 extends through into the interior of the fixed shell 9, and the end is rotatably connected to a second piston plate 16 that can slide along the inner wall of the cavity 19. By rotating the adjusting screw 10, the second piston plate 16 can be precisely pushed to move axially inside the cavity 19, changing the internal volume of the active oil supply cavity, and realizing the controllable extrusion delivery of hydraulic oil. The oil inlet end of the sealing airbag 3 is fixedly connected to the flow pipe 17, and the other end of the flow pipe 17 is connected to the active oil supply chamber inside the fixed shell 9, forming a complete hydraulic oil supply channel. During equipment installation, the operator engages the opening and closing first half ring 1 and the second half ring 2 at the fiberglass pipe docking position. By rotating the adjusting screw 10, the second piston plate 16 is pushed to slide smoothly along the inside of the partition 19, squeezing the hydraulic oil inside the partition 19. This allows the hydraulic oil to be stably delivered to the sealing airbag 3 through the flow pipe 17, driving the sealing airbag 3 to expand as a whole, tightly fitting the outer wall of the fiberglass pipe docking, forming an all-round tight seal for the pipe docking gap, and completing the sealing assembly operation at the pipe docking point.

[0036] During long-term pipeline operation, when the ambient temperature or the temperature of the pipeline medium rises, the hydraulic oil inside the sealing airbag 3 and the compensation chamber undergoes thermal expansion. Excess hydraulic oil can flow back and be collected in the temperature compensation side cavity 19, preventing excessive expansion and rupture of the sealing airbag 3 due to excessive hydraulic oil pressure, while also preventing excessive sealing pressure from damaging the brittle fiberglass pipe wall. When the temperature decreases and the hydraulic oil contracts, causing the sealing pressure to decrease, the compensation side cavity 19 can cooperate with the elastic structure inside the cavity to replenish the pressure and maintain the internal pressure of the sealing airbag 3, continuously ensuring the sealing fit effect. Compared with traditional rigid clamps and fixed sealing clamps, this device, through its dual-cavity split hydraulic oil supply and temperature-adaptive pressure storage compensation structure, solves the defects of traditional clamps such as uneven sealing pressure, poor temperature adaptability, easy leakage, and easy damage to the fiberglass pipe wall, significantly improving the sealing stability and service life of the fiberglass pipe joint.

[0037] Multiple sets of elastic teeth 4 are fixedly installed on the inner side of the sealing airbag 3. These elastic teeth 4 are evenly spaced around the inner circumference of the sealing airbag 3, and the overall design of the elastic teeth 4 is trapezoidal. Adjacent sets of elastic teeth 4 are staggered, forming a staggered labyrinth sealing structure. This differs from the smooth sealing surface and aligned straight-bar sealing tooth structure used in existing traditional pipe clamps. Traditional sealing structures have a single sealing fit, making them prone to axial leakage channels due to microscopic unevenness of the pipe wall, pipe end roundness deviation, and micro-gaps between fiber layers caused by the winding and molding of fiberglass pipes. Furthermore, they suffer from concentrated sealing pressure and poor fault tolerance, leading to localized leakage and sealing failure with long-term use.

[0038] During the process of the sealing airbag 3 expanding and clamping the fiberglass pipe at the docking position driven by hydraulic oil, the multiple sets of trapezoidal elastic teeth 4 arranged inside the sealing airbag 3 will simultaneously deform under pressure, causing the multiple sets of elastic teeth 4 to fit tightly into the micro-texture gaps on the outer side of the pipe wall around the center point of the pipe docking, achieving multi-point, full-coverage sealing. At the same time, relying on the staggered arrangement structure of adjacent elastic teeth 4, the straight-through medium leakage path of the traditional aligned seal is completely broken, forming a three-dimensional tortuous labyrinth sealing channel. When the medium leaks outward, it must detour multiple times and be blocked at each level, greatly improving the sealing damping and leakage resistance.

[0039] Meanwhile, multiple sets of staggered trapezoidal elastic teeth 4 can disperse the sealing contact stress, avoid stress concentration at a single point, and effectively adapt to the irregular pipe opening shape of FRP pipes. Even if there are local minor depressions or protrusions in the pipe wall, the staggered elastic teeth 4 can compensate for each other and fit together, preventing the formation of through-leakage gaps. Moreover, the multi-point staggered interlocking structure can significantly increase the friction between the pipe wall and the sealing airbag 3, effectively resisting the sealing offset problem caused by pipeline medium pulsation, pipeline vibration, and axial micro-movement, preventing the sealing interface from slipping and loosening, and greatly improving the sealing stability, sealing performance and durability of the FRP pipe connection position.

[0040] Reference Figures 1-8 A pressure regulator is installed inside one of the cavities 19 formed by the first partition 15 of the fixed shell 9. This regulator absorbs the thermal expansion of hydraulic oil and achieves temperature-adaptive pressure stabilization. The whole system constitutes a passive mechanical temperature and pressure compensation system, which effectively solves the industry defects of traditional FRP pipe couplings that lack temperature compensation structure and are prone to overpressure damage or low-pressure leakage due to thermal expansion and contraction of hydraulic oil. Traditional hydraulic sealing couplings can only achieve fixed pressure pre-tightening sealing and cannot adapt to changes in operating temperature. When the ambient temperature or medium temperature rises, the hydraulic oil expands due to heat, which can cause a sudden increase in the internal pressure of the air bladder, leading to air bladder rupture and pipe wall compression damage. When the temperature drops, the hydraulic oil contracts, which can cause the sealing pressure to decrease, the seal to loosen and leak, and the sealing stability is extremely poor under temperature alternation conditions.

[0041] The pressure regulator specifically includes a first piston plate 11 slidably mounted inside the corresponding diaphragm 19. A connecting spring 12 is fixedly mounted between the first piston plate 11 and the wall of the diaphragm 19. Pressure storage and release regulation are achieved by the sliding elastic cooperation between the first piston plate 11 and the connecting spring 12. At the same time, the inlet of the sealing airbag 3 is connected to the inside of the diaphragm 19 through the first one-way valve 13, and the outlet of the sealing airbag 3 is connected to the inside of the diaphragm 19 through the second one-way valve 14. The inlet diameter of the second one-way valve 14 is larger than the outlet diameter of the first one-way valve 13, forming a differentiated flow structure of "large-diameter rapid oil discharge and small-diameter slow oil return", thus constructing a fast and slow bidirectional asymmetric hydraulic regulation logic.

[0042] During actual sealing operations, the hydraulic oil inside the sealing airbag 3 will undergo thermal expansion and deformation due to the influence of the ambient temperature or the temperature of the medium flowing inside the pipeline, resulting in an abnormal increase in the internal pressure of the airbag. At this time, the expanded hydraulic oil can be quickly discharged through the large-diameter second one-way valve 14 and introduced into the cavity 19. While quickly depressurizing, it pushes the first piston plate 11 to slide along the inner side of the cavity 19, squeezing the connecting spring 12 to compress and deform it. The compression stroke of the connecting spring 12 absorbs the excess thermal expansion of the hydraulic oil, quickly balancing the excessive pressure inside the airbag, effectively preventing the sealing airbag 3 from overpressure rupture, and at the same time preventing the brittle fiberglass pipe wall from delamination and cracking damage caused by high-pressure hard extrusion.

[0043] As the operating temperature gradually decreases, the thermal expansion effect of the hydraulic oil diminishes, and the overall volume shrinks. Consequently, the internal pressure of the sealing airbag 3 decreases, posing a risk of seal loosening and leakage. At this point, the compressed connecting spring 12 releases its elastic restoring potential energy, pushing the first piston plate 11 to slide and compress the hydraulic oil inside the diaphragm 19. The hydraulic oil can only slowly and steadily flow back into the sealing airbag 3 through the small-diameter first one-way valve 13. By slowly replenishing oil and stabilizing the pressure, the effective sealing pressure of the sealing airbag 3 is continuously maintained, avoiding seal failure caused by a sudden drop in pressure due to low temperature.

[0044] In implementing the above technology, existing sealing airbags mostly adopt an integral single-cavity interconnected structure, and the matching pressure compensation chamber is an integrated interconnected cavity, with hydraulic oil in all areas interconnected. When the pipe clamp is exposed to external sunlight, unilateral heat source radiation, or local high-temperature scouring of the pipeline medium, a non-uniform temperature field will appear where the temperature in some areas is higher than that in other areas. The hydraulic oil in the locally heated area will expand thermally first, and the pressure will quickly spread to the entire airbag cavity and compensation chamber, causing miscompensation of pressure throughout the entire area. Ultimately, this will result in severe uneven circumferential sealing pressure of the pipe clamp, leading to problems such as local overpressure and squeezing, and local seal loosening and leakage. At the same time, it is easy to cause local pressure-induced edge chipping and delamination of the FRP pipe, as well as local excessive aging and failure of the sealing airbag. It cannot adapt to complex local temperature difference conditions. Therefore, the following technical improvements are made. Reference Figures 1-8 Multiple diaphragms 18 are fixedly installed inside the sealing airbag 3, which uniformly divide the internal space of the sealing airbag 3 into multiple independent and non-communicating sealing oil pressure areas along the circumference. At the same time, multiple second partitions 20 are fixedly connected to the inside of the fixed shell 9, which divide the compensation chamber area where the first piston plate 11 is installed into multiple independent compensation zones. Each independent sealing area formed by the diaphragms 18 corresponds one-to-one with each independent compensation zone formed by the second partitions 20. Each set of corresponding sealing areas and compensation zones constitutes an independent temperature and pressure compensation unit, and each unit is isolated from each other and works independently.

[0045] Furthermore, this solution adopts a zoned independent oil circuit matching layout structure. Each independent sealed oil pressure area and each independent compensation zone is equipped with an independent flow oil circuit and control valves, with no shared channels and no cross-zone connections. The specific connection path is as follows: Each independent sealed oil pressure area formed by the diaphragm 18 is individually connected to a dedicated flow pipe 17 at its bottom end, and the two ends of each flow pipe 17 are independently connected to the corresponding single sealed oil pressure area and the corresponding single compensation zone. At the same time, each zone is independently equipped with a dedicated first check valve 13 and a second check valve 14. The first check valve 13 and the second check valve 14 are independently installed in the oil circuit of the corresponding flow pipe 17. The check valves of each zone open and close independently without interfering with each other, so that each temperature and pressure compensation unit forms a dedicated, closed, and independent hydraulic circulation path, and the hydraulic oil of each unit is completely isolated, completely eliminating the situation of hydraulic oil crossflow and pressure interference between different zones. When any region experiences localized thermal expansion or pressure fluctuations, only the corresponding independent oil circuit and independent compensation zone respond and operate, while the oil circuits of other zones remain in a closed and stable state, truly achieving complete isolation and independent adaptive pressure relief and replenishment for each unit.

[0046] In actual operation, when the sealing airbag 3 experiences localized heating and inconsistent heating temperatures across different areas, only the hydraulic oil in the heated area undergoes thermal expansion and pressure increase. This portion of hydraulic oil can only flow back to its corresponding independent compensation zone, pushing the first piston plate 11 of that zone to slide and compress the connecting spring 12 to complete local pressure relief and energy storage. Pressure fluctuations are completely confined within this zone and will not be transmitted to or interfere with other unheated sealing and compensation areas. The sealing oil pressure in other normal temperature areas remains stable, preventing passive pressure increases and erroneous compensation.

[0047] When the temperature of the locally heated area drops and the hydraulic oil pressure decreases, the connecting spring 12 in the corresponding independent compensation zone elastically resets, pushing the hydraulic oil in that zone to slowly flow back to the corresponding sealing airbag 3 area, achieving local independent pressure stabilization and replenishment. This structure completely blocks the interference of global pressure linkage caused by local temperature fluctuations, realizing independent adaptive temperature compensation for each zone. It effectively solves the technical pain points that traditional integral hydraulic structures cannot overcome, such as local high temperature miscompensation, circumferential seal off-center load, local airbag overpressure damage, and local extrusion damage to fiberglass pipes. It significantly improves the sealing uniformity, stability, and environmental adaptability of the pipe clamp under non-uniform temperature conditions.

[0048] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A fiberglass pipe coupling, characterized in that, include: The first half-ring (1) and the second half-ring (2); A sealing airbag (3) is disposed on the inner side of the first half-ring (1) and the second half-ring (2) to form a seal at the joint of the fiberglass pipe; A sealing aid is located between the first half-ring (1), the second half-ring (2) and the sealing airbag (3) for supplying hydraulic fluid into the interior of the sealing airbag (3) to form a sealing operation. The sealing aid includes a fixed shell (9) that is fixedly connected to the inner side of the first half-ring (1) and the second half-ring (2) respectively. The inner side of the fixed shell (9) is separated by a first partition (15) to form two cavities (19). One of the cavities (19) forms an oil supply operation, and the other cavity (19) can expand and collect the hydraulic fluid inside the sealing airbag (3) when the hydraulic fluid is affected by temperature.

2. The fiberglass pipe coupling according to claim 1, characterized in that: The sealing aid also includes a second piston plate (16) slidably connected to the inside of the diaphragm (19). An adjusting screw (10) is threadedly connected to one side of the fixed shell (9), and one end of the adjusting screw (10) passes through the inside of the fixed shell (9) and is rotatably connected to the second piston plate (16). A flow pipe (17) is installed at the oil inlet of the sealing airbag (3), and the flow pipe (17) communicates with the inside of one of the diaphragms (19).

3. A fiberglass pipe coupling according to claim 1, characterized in that: Multiple sets of elastic teeth (4) are fixedly connected to the inner side of the sealing airbag (3). The multiple sets of elastic teeth (4) are distributed at equal distances around the inner side of the sealing airbag (3), and the elastic teeth (4) are trapezoidal.

4. A fiberglass pipe coupling according to claim 3, characterized in that: Each pair of elastic teeth (4) is staggered to form a labyrinth seal.

5. A fiberglass pipe coupling according to claim 2, characterized in that: The inner side of the diaphragm (19) is provided with a pressure regulator to absorb thermal expansion: The pressure regulator includes a first piston plate (11) slidably connected to the inside of another compartment (19), a connecting spring (12) is installed between the first piston plate (11) and the compartment (19), the outlet of the sealing airbag (3) is connected to the inside of another compartment (19) through a second one-way valve (14), and the inlet of the sealing airbag (3) is connected to the inside of another compartment (19) through a first one-way valve (13).

6. A fiberglass pipe coupling according to claim 5, characterized in that: The flow diameter of the second check valve (14) is larger than that of the first check valve (13), so that the hydraulic oil can be discharged quickly when heated and expanded, and a slow oil supply is formed during the return flow process.

7. A fiberglass pipe coupling according to claim 5, characterized in that: The sealing airbag (3) has multiple diaphragms (18) fixedly connected inside, and the multiple diaphragms (18) divide the internal space of the sealing airbag (3) into multiple compensation cavities.

8. A fiberglass pipe coupling according to claim 7, characterized in that: The inner side of the fixed shell (9) is fixedly connected with a plurality of second partitions (20), which divide the plurality of first piston plates (11) into a plurality of compensation cavities.

9. A fiberglass pipe coupling according to claim 8, characterized in that: The area divided by the diaphragm (18) corresponds to the area divided by the second partition (20), so that the thermal expansion of the sealing airbag (3) during local heating will not affect other areas.

10. A fiberglass pipe coupling according to claim 1, characterized in that: The first half-ring (1) and the second half-ring (2) are hinged together by a rotating rod (5); Rotary seat (8) is rotatably connected to the inner side of the first half ring (1). A threaded rod (6) is fixedly connected to the top of the rotating seat (8), and a nut (7) is threadedly connected to the outer wall of the threaded rod (6).

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