Large-diameter high-pressure-resistant glass steel tank and processing technology thereof

Abstract

The application belongs to the technical field of pressure vessels, and particularly relates to a large-diameter high-pressure-resistant glass fiber reinforced plastic (FRP) tank and a processing technology thereof. The glass fiber reinforced plastic tank comprises a cylinder body and a flange. The cylinder body comprises a base layer and a first winding layer. The first winding layer is wound with multiple layers on the outside of the base layer. The flange comprises a prefabricated layer and a second winding layer on the outside of the prefabricated layer. The second winding layer on the shoulder of the flange and the first winding layer on the circumferential side of the pole hole of the cylinder body are alternately arranged. The prefabricated layer of the flange is integrally formed with the cylinder body by the alternate arrangement of the first winding layer and the second winding layer. The prefabricated layer of the flange is included in the first winding layer of the cylinder body by the integral forming process of the flange. The mechanical interlocking structure is formed by the second winding layer of the flange and the first winding layer, so that the anti-peeling strength of the flange and the tank body is significantly improved, the peeling strength is improved by more than three times, and the problem of flange debonding under high-pressure working conditions is effectively prevented.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of pressure vessels, and particularly relates to a large-diameter high-pressure glass steel tank and a processing technology thereof. BACKGROUND

[0002] With the improvement of large-scale production demand, large-diameter glass steel pressure tanks with a diameter greater than 3m are widely demanded, and the single-tank volume can reach 50-500m 3 , which can meet the large-scale medium storage and reaction demand.

[0003] However, the glass steel pressure tank itself has limitations in pressure resistance, sealing performance and long-term stability. With the increase of the diameter of the glass steel tank, the pressure on the glass steel tank also increases, and the defects of the winding process and the flange assembly method of the glass steel tank are more prominent.

[0004] In the prior art, the cylinder body is first manufactured, then the formed flange is placed in the polar hole area of the cylinder body and bonded with the edge of the cylinder body by using an adhesive, and then the cylinder body and the flange are fixed by winding with glass fibers.

[0005] However, the connection surface of the cylinder body and the flange of the glass steel tank made by this method is difficult to ensure complete adhesion, and small gaps are easy to appear under pressure, which leads to the flange being easily separated from the cylinder body, thereby restricting the performance improvement of the glass steel pressure tank. SUMMARY

[0006] In order to solve the problems existing in the prior art, the application provides a large-diameter high-pressure glass steel tank and a processing technology thereof. The flange is integrally formed by using a flange integral forming process, the preformed layer of the flange is included in the first winding layer of the cylinder body, and the second winding layer of the flange and the first winding layer form a mechanical interlocking structure, thereby significantly improving the peel strength of the flange and the tank body, the peel strength is improved by more than three times, and the problem of flange debonding under high pressure working conditions is effectively prevented.

[0007] The specific technical scheme adopted by the application is as follows:

[0008] A large-diameter high-pressure glass steel tank, comprising a cylinder body and a flange located at the end of the cylinder body, the cylinder body comprising a base layer and a first winding layer in a cylindrical shape, the first winding layer being wound with multiple layers on the outside of the base layer, the flange comprising a preformed layer and a second winding layer located outside the preformed layer, the second winding layer located at the shoulder of the flange being arranged alternately with the first winding layer located at the polar hole side of the cylinder body, and the preformed layer of the flange being integrally formed with the cylinder body by the alternate arrangement of the first winding layer and the second winding layer.

[0009] The base layer is glass cloth, the material of the first winding layer and the second winding layer is the same and is a fiber reinforced body, and the fiber reinforced body is a glass fiber winding yarn with a surface impregnated with a composite resin.

[0010] The content of the composite resin in the fiber reinforced body is 28%-32% by mass percentage.

[0011] The composite resin comprises, by mass fraction, 80-120 parts of a main resin, 18-22 parts of a toughening agent, 1.5-2.5 parts of a curing accelerator, and 1-2 parts of an anti-aging additive.

[0012] The main resin comprises one or more of a polyurethane epoxy resin, a phenolic resin, and a vinyl resin.

[0013] The surface of the flange is further provided with a laying layer, the laying layer comprises a surface felt and a chopped felt, the surface felt is located outside the chopped felt, the glass fiber density of the chopped felt is 450 g / cm 2 , the resin content of the chopped felt is 75%, the glass fiber density of the surface felt is 30 g / cm 2 , and the resin content of the surface felt is 90%.

[0014] The laying layer comprises at least two layers of surface felt and three layers of chopped felt, and the surface felt is located above the chopped felt.

[0015] The sealing end of the flange is provided with a sealing groove for embedding and fixing the sealing ring, the cross section of the sealing ring is in a ladder-shaped structure, the narrow end of the sealing ring faces the groove bottom of the sealing groove, and the gap between the sealing ring and the sealing groove forms a compensation cavity.

[0016] The inner part of the barrel is provided with an exhaust pipe, one end of the exhaust pipe is fixed to the inner part of the barrel, and the other side of the exhaust pipe extends along the outlet side of the flange and communicates with the external environment.

[0017] The processing process specifically comprises the following steps:

[0018] S1, wrapping glass cloth on a cylindrical mold to form a base layer;

[0019] S2, using a numerical control winding machine, a fiber reinforced body is used to wind the mold at an inclined angle, a multi-stage hole gradual winding process is used for the fiber reinforced body at both ends of the base layer to form a pole hole area of the barrel;

[0020] S3, placing the prefabricated layer of the flange at the pole hole of the barrel, and then continuing to use the fiber reinforced body to wind the mold at an inclined angle, and alternately winding the first winding layer and the second winding layer to complete the molding of the glass steel tank.

[0021] The beneficial effects of the present application are:

[0022] 1、Therefore, the flange is integrally formed in the present application, and the prefabricated layer of the flange is included in the first winding layer of the cylinder body, and the second winding layer of the flange and the first winding layer form a mechanical interlocking structure, thereby significantly improving the anti-peeling strength of the flange and the tank body, the peeling strength is increased by more than three times, and the problem of flange debonding under high pressure working condition is effectively prevented.

[0023] In the present application, the glass steel tank is designed to withstand 7MPa pressure, the safety factor is 5, the flange pressure capacity is increased to more than 10MPa, and the weight is reduced by 50%, which is suitable for high pressure gas, liquid energy storage and other lightweight high pressure scenes.

[0024] 2、The cylinder body in the present application adopts high-strength glass fiber winding yarn and glass cloth to form a composite structure, wherein the glass fiber winding yarn provides axial strength, and the glass cloth enhances the radial shear performance, and the two cooperate to improve the overall mechanical properties.

[0025] 3、The setting of the compensation cavity in the present application makes the sealing ring of the trapezoidal structure automatically compensate for deformation under high pressure, and ensures that the sealing surface of the flange is uniformly contacted. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a structural schematic diagram of the present application;

[0027] Figure 2 is a structural schematic diagram of the flange and the connecting area of the cylinder body;

[0028] Figure 3 is Figure 2 is a sectional structure schematic diagram of the flange sealing end of part A in the present application;

[0029] In the drawings, 1 is a cylinder body, 101 is a base layer, 102 is a first winding layer, 2 is a flange, 201 is a prefabricated layer, 202 is a second winding layer, 3 is a laying layer, 301 is a surface felt cloth, 302 is a chopped felt cloth, 4 is a sealing groove, 5 is a sealing ring, and 6 is an exhaust pipe. DETAILED DESCRIPTION

[0030] The present application will be further described below in combination with the drawings and specific embodiments:

[0031] The specific embodiments are as follows: Figures 1-3As shown, the present invention provides a large-diameter, high-pressure-resistant fiberglass tank, including a cylindrical body 1 and a flange 2 located at the end of the cylindrical body 1. The cylindrical body 1 includes a cylindrical base layer 101 and a first winding layer 102. The first winding layer 102 has multiple layers wound on the outside of the base layer 101. The flange 2 includes a pre-formed layer 201 and a second winding layer 202 located outside the pre-formed layer 201. The second winding layer 202 located at the shoulder of the flange 2 and the first winding layer 102 located around the periphery of the pole hole of the cylindrical body 1 are alternately arranged. The pre-formed layer 201 of the flange 2 is integrally formed with the cylindrical body 1 by means of the alternating arrangement of the first winding layer 102 and the second winding layer 202.

[0032] In existing technologies, the process typically involves first fabricating the cylinder body 1, then directly placing the formed flange 2 into the perforated area of ​​the cylinder body 1 and bonding it to the edge of the cylinder body 1 with an adhesive. Next, fiberglass is wound to secure the cylinder body 1 and flange 2. However, with this method, it is difficult to ensure a complete fit between the cylinder body 1 and flange 2 at the connection surfaces. Under pressure, minute gaps can easily appear, causing flange 2 to detach from the cylinder body 1, thus hindering the performance improvement of the fiberglass pressure tank.

[0033] Therefore, the present invention adopts an integral forming process for flange 2, such as Figure 2 As shown, the prefabricated layer 201 of flange 2 is included inside the first winding layer 102 of cylinder 1. The second winding layer 202 of flange 2 and the first winding layer 102 form a mechanical interlocking structure, thereby significantly improving the peel strength between flange 2 and tank body. The peel strength is increased by more than three times, effectively preventing the problem of flange 2 debonding under high pressure working conditions.

[0034] The flange 2 has a prefabricated layer 201 and a second winding layer 202, each 50mm thick. The glass fiber of the prefabricated layer 201 and the glass fiber of the second winding layer 202 are integrated. The flange 2 is prefabricated using glass fiber and then wound around the prefabricated layer 201. At this time, the glass fiber used in the winding cylinder 1 is also wound to the periphery of the flange 2 located at the pole hole. The glass fiber used in the winding flange 2 and the glass fiber used in the winding cylinder 1 are wound alternately, so that the first winding layer 102 and the second winding layer 202 form a mechanical interlock.

[0035] The base layer 101 is glass cloth, and the first winding layer 102 and the second winding layer 202 are made of the same material and are both fiber reinforced. The fiber reinforced material is glass fiber wound yarn with a surface impregnated with composite resin.

[0036] The composite resin content in the fiber reinforcement is 28%-32% by mass percentage.

[0037] The composite resin comprises 80-120 parts of main resin, 18-22 parts of toughening agent, 1.5-2.5 parts of curing accelerator and 1-2 parts of anti-aging additive by mass fraction.

[0038] The main resin comprises one or more of polyurethane epoxy resin, phenolic resin and vinyl resin.

[0039] The cylinder 1 in the application adopts a composite structure formed by high-strength glass fiber winding yarn and glass cloth, wherein the glass fiber winding yarn provides axial strength, and the glass cloth enhances radial shear performance, and both of them synergistically improve the overall mechanical performance.

[0040] Wherein after the glass fiber winding yarn composite resin is infiltrated, the fiber and the resin interface form chemical combination, which not only wraps the fiber to form a whole stress unit, but also isolates the corrosion of the medium to the fiber. In addition, the resin can fully fill the gap between the fibers and form a uniform interface transition layer, so that the synergistic stress efficiency of the fiber and the resin is maximized, and in the scene of significant circumferential stress of large-diameter tank body, radial bulging deformation can be effectively resisted.

[0041] The use of the formula makes the tensile elastic modulus of the material reach 50GPa, which is more than 40% higher than that of traditional resin, and the material has excellent chemical corrosion resistance and fatigue resistance. And the material cost is reduced by 30% compared with carbon steel tank, and the service life is prolonged to more than 15 years.

[0042] The surface of the flange 2 is also provided with a laying layer 3, the laying layer 3 comprises a surface felt 301 and a chopped felt 302, the surface felt 301 is located outside the chopped felt 302, the glass fiber density of the chopped felt 302 is 450g / cm2, the resin content of the chopped felt 302 is 75%, the glass fiber density of the surface felt 301 is 30g / cm2, and the resin content of the surface felt 301 is 90%.

[0043] The laying layer 3 comprises at least two layers of surface felt 301 and three layers of chopped felt 302, and the surface felt 301 is located above the chopped felt 302.

[0044] The laying layer 3 solves the cracking problem of the connection area of the cylinder 1 and the flange 2 caused by stress concentration. Since the connection area of the cylinder 1 and the flange 2 is a corner, stress concentration is easy to occur, therefore the laying layer 3 forms a wrapped stress dispersion structure, which covers the stress concentration area of the shoulder of the flange 2 and the connection of the cylinder 1. When the tank body is under pressure, the laying layer 3 can absorb the radial load by itself deformation, avoiding the fatigue crack initiation under repeated pressure impact.

[0045] Wherein the glass fiber density of the chopped felt 302 is high, providing high shear strength, adapting to the stress concentration when the flange 2 is connected with the pipeline; the resin content of the surface felt 301 is high, improving the surface density and forming a fine network protective layer.

[0046] The sealing end of the flange 2 is provided with a sealing groove 4 for embedding and fixing the sealing ring 5, the cross section of the sealing ring 5 is trapezoidal structure, the narrow end of the sealing ring 5 faces the groove bottom of the sealing groove 4, and the gap between the sealing ring 5 and the sealing groove 4 forms a compensation cavity.

[0047] The sealing groove 4 is a double-channel O-shaped rubber ring groove, the material of the sealing ring 5 is customized fluorine rubber, the hardness is Shore A 80-A90, the surface of the sealing ring 5 is coated with a nano-hydrophobic coating, which reduces the friction coefficient and prevents high-pressure medium penetration.

[0048] With the above sealing structure, there is no leakage under 30MPa pressure for 24 hours, and the sealing life is prolonged by 5 times compared with the traditional structure.

[0049] The setting of the compensation cavity makes the trapezoidal structure sealing ring 5 automatically compensate deformation under high pressure, and ensures that the sealing surface of the flange 2 is uniformly contacted.

[0050] The inside of the cylinder body 1 is provided with an exhaust pipe 6, one end of the exhaust pipe 6 is fixed to the inside of the cylinder body 1, the other side of the exhaust pipe 6 extends along the outlet side of the flange 2 and communicates with the outside environment.

[0051] The processing process specifically includes the following steps:

[0052] S1, wrapping the glass cloth on the cylindrical mold to form a base layer 101;

[0053] S2, using a numerical control winding machine, winding the mold along the inclined angle of the fiber reinforced body, and using a multi-stage hole gradual winding process at both ends of the base layer 101 to form the pole hole area of the cylinder body 1;

[0054] S3, placing the prefabricated layer 201 of the flange 2 at the pole hole of the cylinder body 1, and then continuing to wind the mold along the inclined angle of the fiber reinforced body, and alternately winding the first winding layer 102 and the second winding layer 202 to complete the molding of the glass steel tank.

[0055] After the glass steel tank is formed, the whole needs to be cured at a temperature not lower than 80℃ for at least 3 hours, and the mechanical properties of the glass steel tank can be improved by more than 25% through the curing treatment. The failure rate of the glass steel tank is reduced to below 0.5% through the integrated flange 2 and sealing structure.

Claims

1. A large-diameter, high-pressure-resistant fiberglass tank, comprising a cylindrical body (1) and a flange (2) located at the end of the cylindrical body (1), characterized in that, The cylinder (1) includes a cylindrical base layer (101) and a first winding layer (102). The first winding layer (102) has multiple layers wound on the outside of the base layer (101). The flange (2) includes a prefabricated layer (201) and a second winding layer (202) located outside the prefabricated layer (201). The glass fiber of the prefabricated layer (201) and the glass fiber of the second winding layer (202) are integrated. The second winding layer (202) located on the shoulder of the flange (2) and the first winding layer (102) located on the periphery of the pole hole of the cylinder (1) are alternately arranged. The prefabricated layer (201) of the flange (2) is integrally formed with the cylinder (1) by means of the alternating arrangement of the first winding layer (102) and the second winding layer (202).

2. The large-diameter, high-pressure-resistant fiberglass tank according to claim 1, characterized in that, The base layer (101) is glass cloth, and the first winding layer (102) and the second winding layer (202) are made of the same material and are both fiber reinforced. The fiber reinforced is glass fiber winding yarn with a surface impregnated with composite resin.

3. A large-diameter, high-pressure-resistant fiberglass tank according to claim 2, characterized in that, The composite resin content in the fiber reinforcement is 28%-32% by mass percentage.

4. A large-diameter, high-pressure-resistant fiberglass tank according to claim 2, characterized in that, The composite resin, by weight, comprises 80-120 parts of main resin, 18-22 parts of toughening agent, 1.5-2.5 parts of curing accelerator, and 1-2 parts of anti-aging additive; The main resin includes one or more of polyurethane epoxy resin, phenolic resin, and vinyl resin.

5. A large-diameter, high-pressure-resistant fiberglass tank according to claim 1, characterized in that, The flange (2) is further provided with a layup (3), which includes a surface felt (301) and a chopped strand mat (302). The surface felt (301) is located outside the chopped strand mat (302), and the glass fiber density of the chopped strand mat (302) is 450 g / cm³. 2 The chopped strand mat (302) has a resin content of 75%, and the surface mat (301) has a glass fiber density of 30 g / cm³. 2 The resin content of the surface felt (301) is 90%.

6. A large-diameter, high-pressure-resistant fiberglass tank according to claim 5, characterized in that, The layup (3) includes at least two layers of surface felt (301) and three layers of chopped strand mat (302), with the surface felt (301) located on top of the chopped strand mat (302).

7. A large-diameter, high-pressure-resistant fiberglass tank according to claim 1, characterized in that, The sealing end of the flange (2) is provided with a sealing groove (4) for the sealing ring (5) to be fitted and fixed. The cross section of the sealing ring (5) is trapezoidal. The narrow end of the sealing ring (5) faces the bottom of the sealing groove (4). The gap between the sealing ring (5) and the sealing groove (4) forms a compensation cavity.

8. A large-diameter, high-pressure-resistant fiberglass tank according to claim 1, characterized in that, The cylinder (1) is provided with an exhaust pipe (6) inside. One end of the exhaust pipe (6) is fixed to the inside of the cylinder (1), and the other side of the exhaust pipe (6) extends out along the outlet side of the flange (2) and communicates with the external environment.

9. A processing method for a large-diameter, high-pressure-resistant fiberglass tank, used to manufacture the large-diameter, high-pressure-resistant fiberglass tank as described in claim 1, characterized in that, The processing technology specifically includes the following steps: S1. Wrap the glass cloth around the cylindrical mold to form a base layer (101). S2. Using a CNC winding machine, the fiber reinforcement is wound along the inclined angle of the mold. The fiber reinforcement is wound at both ends of the matrix layer (101) using a multi-level hole gradual winding process to form the polar hole area of ​​the cylinder (1). S3. Place the prefabricated layer (201) of the flange at the pole hole of the cylinder, and then continue to use the fiber reinforced body inclined angle winding mold to alternately wind the first winding layer (102) and the second winding layer (202) to complete the molding of the fiberglass tank.

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