Composite material high-pressure flange connecting system

Abstract

The invention relates to a composite material high-pressure flange connection system, a flange plate group comprises a first flange plate and a second flange plate, and further comprises a sealing compensation assembly and a bolt pre-tightening assembly, coaxial biconical sealing grooves are formed in the first flange plate and the second flange plate, and memory alloy pads and sealing rings are nested in the coaxial biconical sealing grooves; the memory alloy pad and the sealing ring form a sealing compensation assembly, the coaxial biconical sealing groove is communicated with the micro-cavity, the micro-cavity penetrates in the radial direction of the flange and is connected with an external pressure and temperature sensor, and a piezoelectric ceramic gasket is arranged between the lower end face of the head of the bolt and the pressure-bearing face of the first flange plate. The pressure and temperature sensor and the piezoelectric ceramic gasket monitor and obtain sensing data in real time and upload the sensing data to the controller, and the controller is connected with the alloy ring current heater. According to the high-pressure flange connecting system, the flange connecting pressure condition can be monitored in real time, and meanwhile, the sealing performance can be dynamically adjusted.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flange assembly, and particularly relates to a composite high-pressure flange connecting system. BACKGROUND

[0002] Flanges are essential components in industrial piping systems. With the progress of material science, composite flanges have emerged, among which glass steel (FRP) flanges are particularly prominent. Glass steel, also known as FRP (Fiber Reinforced Plastics), is a type of fiber-reinforced composite plastic. Depending on the type of fiber used, it can be classified as glass fiber-reinforced composite plastic (GFRP), carbon fiber-reinforced composite plastic (CFRP), boron fiber-reinforced composite plastic, etc. It is a composite material made of glass fiber and its products (glass cloth, tape, felt, yarn, etc.) as reinforcing material and synthetic resin as matrix material. Compared with traditional metal flanges, glass steel flanges are composed of corrosion-resistant resin (such as epoxy, vinyl ester, polyester) and inert glass fiber, which can resist the corrosion of various chemical media such as acid, alkali, salt, solvent, seawater, wastewater, chlorine, etc. It is more suitable for corrosive environments such as chemical industry, petrochemical industry, pharmaceutical industry, water treatment (wastewater treatment, seawater desalination), papermaking, electroplating, metallurgy, etc.

[0003] The core advantage of glass steel flanges lies in their unparalleled corrosion resistance, lightweight, insulation, and long-term economy. They are ideal substitutes for metal flanges in applications requiring strong corrosion resistance, lightness, electrical insulation, or reduced life cycle costs (such as water treatment, chemical industry, offshore platforms), so in extreme functional environments such as high pressure or strong corrosion, composite flanges, especially glass steel flanges, will be increasingly preferred.

[0004] A domestic patent with application number CN202120643725.8 discloses a LNG pipeline flange leakage protection and detection device for protecting the first pipeline and the second pipeline connected by the flange plate. The LNG pipeline flange leakage protection and detection device includes a protective cover located on the outer periphery of the flange plate. The protective cover is divided into a first cover body and a second cover body that are mutually connected. The first cover body and the second cover body are detachably connected through a fastening assembly. The first cover body and the second cover body are respectively provided with upper and lower inspection openings with opposite positions. The joint of the first cover body and the second cover body is provided with a radial sealing assembly. The contact surfaces of the protective cover, the first pipeline, and the second pipeline are all provided with axial sealing assemblies. The LNG pipeline flange leakage protection and detection device has the characteristics of simple structure and convenient installation. The sealing performance of the protective cover is strong, and the inspection openings are provided to facilitate the implementation of pipeline flange leakage detection and improve the operational safety. However, this application can only detect and cannot dynamically adjust the sealing performance of the flange while detecting. SUMMARY

[0005] The application provides a composite high-pressure flange connection system, which can monitor the pressure condition of the flange connection in real time and dynamically adjust the sealing performance of the high-pressure glass fiber reinforced plastic flange.

[0006] The application provides a composite high-pressure flange connection system, which can monitor the pressure condition of the flange connection in real time and dynamically adjust the sealing performance of the high-pressure glass fiber reinforced plastic flange. The composite high-pressure flange connection system comprises a flange disc set, a sealing compensation assembly and a bolt pre-tightening assembly, the flange disc set comprises a first flange disc and a second flange disc, coaxial double-cone-shaped sealing grooves are formed in the first flange disc and the second flange disc, a memory alloy pad and a sealing ring are nested in the coaxial double-cone-shaped sealing grooves, the memory alloy pad and the sealing ring constitute the sealing compensation assembly, the coaxial double-cone-shaped sealing grooves are communicated with microcavities, the microcavities are penetrated along the flange in the radial direction and connected with external pressure and temperature sensors, first bolt holes are formed in the first flange disc, second bolt holes are formed in the second flange disc, the first bolt holes and the second bolt holes are connected through bolts, and a piezoelectric ceramic gasket is arranged between the lower end surface of the bolt head and the pressure bearing surface of the first flange disc, wherein the pressure and temperature sensors and the piezoelectric ceramic gasket acquire sensing data in real time and upload the sensing data to a controller, and the controller is connected with an alloy ring current heater.

[0007] As a preferred technical scheme of the application, the groove bottom of the double-cone-shaped sealing groove is provided with a flow guide channel, the outer wall of the memory alloy pad is provided with a protruding claw, and the protruding claw is embedded in the flow guide channel.

[0008] As a preferred technical scheme of the application, the depth of the flow guide channel is According to the curvature radius of the groove bottom of the double-cone-shaped sealing groove and the groove depth are set, and the specific formula is:

[0009]

[0010] wherein, the elastic modulus of the flange disc.

[0011] As a preferred technical scheme of the application, the memory alloy pad is provided with an outwardly protruding elastic ejector pin on the side far from the protruding claw, and the elastic ejector pin is inserted into a connecting cavity of the first flange disc upwards.

[0012] As a preferred technical scheme of the application, the connecting cavity comprises an interference cavity which is concave upwards at the top and matched with the elastic ejector pin.

[0013] As the preferred technical scheme of the present application, the second flange plate is provided with a threading hole, the pressure and temperature sensor is arranged in the micro-cavity, the sensor data line of the pressure and temperature sensor extends out of the second flange plate through the threading hole, and sealing glue is filled between the threading hole and the sensor data line.

[0014] As the preferred technical scheme of the present application, the adjacent piezoelectric ceramic pads are connected through a CAN bus, and the piezoelectric ceramic pads are connected with the pressure and temperature sensor.

[0015] As the preferred technical scheme of the present application, an alloy ring current heater is arranged near the memory alloy pad, and when the pressure value in the micro-cavity exceeds a preset pressure value, the alloy ring current heater is triggered to perform heating work.

[0016] As the preferred technical scheme of the present application, the second flange plate is provided with an emergency sealant injection hole, the emergency sealant injection hole is connected with an emergency sealant injection ring groove, the emergency sealant injection ring groove is communicated with the flow guide channel, and the emergency sealant injection hole is connected with a one-way valve.

[0017] In summary, the present application has the following beneficial effects:

[0018] 1、The flange plate set is designed, including a first flange plate and a second flange plate, and further including a sealing compensation assembly and a bolt pre-tightening assembly, wherein the bolt pre-tightening assembly includes a bolt and a piezoelectric ceramic pad, the piezoelectric ceramic pad is used to monitor the pressure between the bolt and the pressure bearing surface of the first flange plate in real time, so as to calculate the sealing degree between the first flange plate and the second flange plate, and the piezoelectric ceramic pad converts the bolt stress into an electric signal, which is low in cost and better applied in industry.

[0019] 2、The piezoelectric ceramic pad and the pressure and temperature sensor are used to acquire real-time data, and the controller controls the alloy ring current heater to warm the memory alloy pad, the current heater is a technical hub for realizing "intelligent compensation", is organically combined with the whole pressure detection, and bears the function of actively triggering the memory alloy pad to compensate in the present application, and better plays a sealing role in a high-pressure state.

[0020] 3、The memory alloy pad and the sealing ring nested in the coaxial double-cone sealing groove form an interference fit, and the sealing performance is improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] 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.

[0022] Figure 1 This is a schematic diagram of the external structure of a composite material high-pressure flange connection system according to the present invention.

[0023] Figure 2 This is an external view of a composite material high-pressure flange connection system from another perspective of the present invention.

[0024] Figure 3 This is a top view of a composite material high-pressure flange connection system according to the present invention.

[0025] Figure 4 For the present invention Figure 3 Cross-sectional view at point AA.

[0026] Figure 5 For the present invention Figure 4 A magnified view of the details at point B in the middle.

[0027] Figure 6 For the present invention Figure 4 A magnified view of the details at point C.

[0028] Figure 7 For the present invention Figure 3 A cross-sectional view of the wire passing through the duct.

[0029] Figure 8 This is a three-dimensional view of the shape memory alloy pad in this invention.

[0030] In the diagram: 100, flange assembly; 100a, first flange; 100b, second flange; 101a, first bolt hole; 101b, second bolt hole; 102, coaxial double conical sealing groove; 112, flow channel; 115, emergency sealant injection hole; 116, emergency sealant injection ring groove; 117, one-way valve; 200, sealing compensation assembly; 201, shape memory alloy gasket; 202, sealing ring; 212, claw; 213, elastic ejector pin; 214, alloy ring current heater; 222, connecting cavity; 223, interference fit cavity; 301, microcavity; 400, bolt; 402, piezoelectric ceramic gasket; 425, pressure and temperature sensor; 427, wiring channel. Detailed Implementation

[0031] It should be understood that the terms "front and back", "upper and lower", "right and left", "vertical and horizontal", and the like as used herein but not specifically shown in the drawings are only intended to facilitate the description of the present application and are not intended to indicate or imply that a depicted device or element must have a particular orientation, thus it cannot be construed as limiting the application.

[0032] Of course in the present technical solution, those skilled in the art should understand that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of one element can be one, and in another embodiment, the number of the element can be multiple, and the term "one" cannot be understood as a limitation on the number.

[0033] Referring to the drawings Figure 1 to the drawings Figure 3 As shown in the drawings, a composite material high-pressure flange connection system includes a flange set 100, the flange set 100 includes a first flange plate 100a and a second flange plate 100b, and further includes a sealing compensation assembly 200 and a bolt pre-tightening assembly, wherein the bolt pre-tightening assembly includes a bolt 400 and a piezoelectric ceramic gasket 402.

[0034] Referring to the drawings Figure 2 , the drawings Figure 4 and the drawings Figure 5 As shown in the drawings, the first flange plate 100a and the second flange plate 100b are connected to each other on the abutting surface of the first flange plate 100a and the second flange plate 100b. A coaxial double-tapered sealing groove 102 is provided, a memory alloy pad 201 and a sealing ring 202 are nested in the coaxial double-tapered sealing groove 102, the memory alloy pad 201 and the sealing ring 202 constitute a sealing compensation assembly 200, the coaxial double-tapered sealing groove 102 is in communication with a micro-cavity 301, the micro-cavity 301 penetrates along the flange radial direction and is connected to an external pressure and temperature sensor 425, the first flange plate 100a is provided with a first bolt hole 101a, the second flange plate 100b is provided with a second bolt hole 101b, the first bolt hole 101a and the second bolt hole 101b are connected by the bolt 400, and the piezoelectric ceramic gasket 402 is arranged between the head lower end surface of the bolt 400 and the pressure bearing surface of the first flange plate 100a. The pressure and temperature sensor 425 and the piezoelectric ceramic gasket 402 real-time monitor and obtain sensing data and upload to the controller, the controller is connected with the alloy ring current heater 214, based on the previous experiment, the different triggering conditions corresponding to the real-time monitoring and obtaining of sensing data by the pressure and temperature sensor 425 and the piezoelectric ceramic gasket 402 can be controlled in the controller. Furthermore, deep learning can be performed through a big data model, and preset data can be optimized after receiving human feedback.

[0035] Further optimizable, the micro-cavity 301 has an asymmetric trapezoidal cross section, the large bottom edge faces the sealing surface, and the volume wherein V is the effective volume of the micro-cavity 301, Diameter of the micro-cavity 301, Circumferential factor of the micro-cavity 301.

[0036] Referring to the drawings Figure 7 and the drawings Figure 8 As shown, the bottom of the double-cone sealing groove 102 is provided with a flow guide channel 112, and the outer wall of the memory alloy pad 201 is provided with a protruding claw 212 embedded in the flow guide channel 112.

[0037] The depth of the flow guide channel 112 According to the curvature radius of the bottom of the double-cone sealing groove 102 And the groove depth Is set, and the specific formula is:

[0038]

[0039] Wherein, The elastic modulus of the flange plate.

[0040] The memory alloy pad 201 is provided with an outwardly protruding elastic pin 213 on the side away from the protruding claw 212, and the elastic pin 213 is inserted into the connecting cavity 222 of the first flange plate 100a upward. Wherein the pin stroke of the elastic pin 213 According to the actual interference amount δ and the stiffness coefficient of the elastic pin 213 required by the mutual cooperation between the elastic pin 213 and the connecting cavity 222 Determined, and the specific relationship needs to meet: .

[0041] Referring to the drawings Figure 6 As shown, the connecting cavity 222 includes an interference cavity with a top recess matching the elastic pin 213.

[0042] Referring to the drawings Figure 7 As shown, the second flange plate 100b is provided with a threading hole 427, and the pressure and temperature sensor 425 is arranged in the micro-cavity 301. The sensor data line of the pressure and temperature sensor 425 extends out of the second flange plate 100b through the threading hole 427, and the threading hole 427 and the sensor data line are filled with sealing glue.

[0043] The adjacent piezoelectric ceramic pads 402 are connected through the CAN bus, and the piezoelectric ceramic pads 402 are connected with the pressure and temperature sensor 425. The control module is connected with the piezoelectric ceramic pads 402 and the pressure and temperature sensor 425, obtains real-time monitoring data of the piezoelectric ceramic pads 402 and the pressure and temperature sensor 425, and executes a dynamic balance algorithm:

[0044]

[0045] is the active compensation force of the ith bolt, is the deviation of the cavity pressure from the set value, is the pressure feedback gain, is the rate of change of the bolt stress, is the differential gain to damp overshoot or oscillation. This is equivalent to a real-time pre-tightening force adjustment system, aiming to offset the impact of Pcav fluctuation on the seal / structure by dynamically adjusting the force of each bolt ΔFi. Typical scenarios include stress relaxation compensation due to thermal expansion / contraction, and multi-bolt synchronous control to prevent local seal failure.

[0046] The alloy ring current heater 214 is provided near the memory alloy pad 201, which is triggered to perform heating work when the pressure value in the cavity of the microcavity 301 exceeds the preset pressure value. When the pressure rises or falls too quickly, exceeding the threshold value determined by the medium viscosity , the system immediately starts the alloy ring heater and increases the temperature at a rate proportional to the absolute value of the pressure change rate and the cubic root of the ring feature size, which is used to quickly compensate for temperature drift or seal ring stress changes caused by pressure transients.

[0047] Specifically, when the microcavity pressure change rate satisfies , the alloy ring current heater 214 is triggered, and its temperature rise rate is given by the following formula:

[0048]

[0049] is the real-time pressure in the microcavity; is the pressure change rate threshold coefficient; is the dynamic viscosity of the working medium in the cavity. The higher the viscosity, the higher the trigger threshold; is the response coefficient; D is the feature size of the alloy ring, a measure of the volume-surface area ratio.

[0050] Further, the remaining life can also be calculated by the cumulative compensation displacement : Remaining life = f (cumulative compensation displacement)

[0051] Cumulative compensation displacement:

[0052]

[0053] wherein, is the displacement amount (unit: m or μm) generated by each compensation action; is the total displacement amount accumulated by the actuator / heater for compensation of pressure-stress drift so far, also known as cumulative compensation displacement.

[0054] Remaining life model:

[0055]

[0056] wherein, N0is the initial (uncompensated) number of life cycles; k is the material / structure degradation coefficient; m is an exponential constant, usually fitted from fatigue or aging tests; is the accumulated compensated displacement after which the remaining allowable number of cycles is

[0057] The second flange 100b is provided with an emergency sealant injection hole 115, which is connected with an emergency sealant injection ring groove 116, the emergency sealant injection ring groove 116 is communicated with the flow guide channel 112, and the emergency sealant injection hole 115 is connected with a one-way valve 117.

[0058] When the conditions are met simultaneously The one-way valve 117 is triggered to open and communicate with the emergency sealant injection hole 115, and the sealing liquid flows from the one-way valve 117 to the flow guide channel 112 through the emergency sealant injection hole 115 and the emergency sealant injection ring groove 116 to strengthen the sealing.

[0059] When the conditions are met simultaneously, the system continues to heat and compensate;

[0060] If any condition is no longer met, the heating current is immediately suspended or locked to prevent overheating or excessive displacement.

[0061] wherein, Q is the instantaneous heating power or heat flow (unit: W or Js⁻¹), is the change rate of heating power (unit: Ws⁻¹), is the maximum steady-state heating power allowed by the system (unit: Ws⁻¹); is the dimensionless safety factor (usually 0.8-1.2); used to leave a margin for the maximum power; is the current compensated displacement (unit: μm or mm) that has been executed; Δdreq: the target displacement required to complete this compensation (unit: μm or mm).

[0062] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any changes or replacements that can be easily thought of by those skilled in the art under the technical hints of the present application should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A composite high pressure flange connection system comprising a flange set (100), the flange set (100) comprising a first flange disc (100a) and a second flange disc (100b), characterized in that: Also include sealing compensation components (200) and bolt pre-tightening components, the first flange plate (100a) and the second flange plate (100b) on the interface surface is provided with coaxial double taper sealing groove (102), the coaxial double taper sealing groove (102) is nested with memory alloy pad (201) and sealing ring (202), the memory alloy pad (201) and the sealing ring (202) constitute sealing compensation components (200), the coaxial double taper sealing groove (102) is communicated with microcavity (301), the microcavity (301) is through along the flange radial and connects external pressure temperature sensor (425), the first flange plate (100a) is provided with first bolt hole (101a), the second flange plate (100b) is provided with second bolt hole (101b), the first bolt hole (101a) and the second bolt hole (101b) are connected by bolt (400), the bolt (400) head lower end surface and the first flange plate (100a) pressure surface are provided with piezoelectric ceramic gasket (402), wherein the pressure temperature sensor (425) and the piezoelectric ceramic gasket (402) real-time monitoring acquisition sensing data and upload to the controller, the controller is connected with alloy ring current heater (214).

2. A composite material high pressure flange connection system according to claim 1, characterized in that, The bottom of the double taper sealing groove (102) is provided with a flow guide channel (112), the outer wall of the memory alloy pad (201) is provided with a lug (212), and the lug (212) is embedded in the flow guide channel (112).

3. A composite material high pressure flange connection system according to claim 2, wherein, The depth of the flow guide channel (112) According to the curvature radius of the groove bottom of the double-cone sealing groove (102) And the groove depth The setting, the specific formula is: wherein, E is the modulus of elasticity of the flange plate.

4. A composite material high pressure flange connection system according to claim 3, wherein, The memory alloy pad (201) is provided with an outwardly protruding elastic ejector pin (213) on the side away from the lug (212), and the elastic ejector pin (213) is inserted into the connecting cavity (222) of the first flange plate (100a) upwardly.

5. A composite material high pressure flange connection system according to claim 4, wherein, The connecting cavity (222) includes an interference cavity (223) recessed upwardly at the top and matched with the elastic ejector pin (213).

6. A composite material high pressure flange connection system according to claim 1 or 5, characterized in that, The second flange plate (100b) is provided with a threading hole (427), and the pressure temperature sensor (425) is arranged in the microcavity (301). The sensor data line of the pressure temperature sensor (425) extends out of the second flange plate (100b) through the threading hole (427), and sealing glue is filled between the threading hole (427) and the sensor data line.

7. A composite material high pressure flange connection system according to claim 6, wherein, The piezoelectric ceramic gaskets (402) are connected by CAN bus, and the piezoelectric ceramic gaskets (402) are connected with the pressure temperature sensor (425).

8. A composite material high pressure flange connection system according to claim 6, wherein, The alloy ring current heater (214) is arranged near the memory alloy pad (201), and when the pressure value in the microcavity (301) exceeds the preset pressure value, the alloy ring current heater (214) is triggered to perform heating work.

9. A composite material high pressure flange connection system according to claim 8, wherein, The second flange plate (100b) is provided with an emergency sealant injection hole (115) connected with an emergency sealant injection ring groove (116) in communication with the flow guide channel (112), and the emergency sealant injection hole (115) is connected with a one-way valve (117).

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