Double-cavity composite material air reservoir with good sealing performance

Abstract

The double-cavity composite material air reservoir comprises 15L cavities and 20L cavities, the 15L cavities and the 20L cavities are fixed, partition plates are arranged in the 20L cavities and are used for reinforcing and supporting, the side ends of the 15L cavities are provided with first air inlets and first air outlets in a communicating mode, first water outlets are formed in the bottoms of the 15L cavities, the number of the 15L cavities is two, and the two 15L cavities are fixedly connected with the 20L cavities in a communicating and welding mode. The 15L cavity on the other side is provided with a second air outlet and a second air inlet, the bottom of the 15L cavity on the other side is provided with a second water outlet, and the outer sides of the 15L cavity and the 20L cavity are wrapped with glass fiber wrapping layers. Through the arrangement of the structure, double-cavity composite gas storage work is achieved, and the production cost is reduced.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of air cylinder equipment, in particular to a double-cavity composite air cylinder with good sealing performance. BACKGROUND

[0002] With the rapid development of science and technology, automobile manufacturers are under increasing pressure to control costs. At present, the raw materials selected by manufacturers for air cylinders are basically aluminum alloys. In recent years, with the rising price of aluminum alloys, the cost is too high. Through the application of composite materials, the cost can be reduced by 25%, which is more conducive to the competitiveness of automobile manufacturers in the industry.

[0003] The lightweight demand of vehicles can be met by changing the raw materials, and the weight of the product can be reduced by 15%, meeting the national requirements for automobile lightweight.

[0004] With the development of automobiles, commercial vehicles have increased the air pressure for braking from 1MPa to 1.2MPa. The aluminum alloy air cylinder will be oxidized and corroded by long-term use and the absorption of different elements of air, which will cause the cylinder body to be thinned and the pressure strength to be reduced. In addition, the cleanliness of compressed air for braking has been improved. Due to oxidation and corrosion of aluminum alloy, the compressed air in the cavity will be polluted, which will affect the safety of the brake.

[0005] At present, most of the materials selected by automobile manufacturers for air cylinders are aluminum alloys, and a small part is carbon steel. The weight of carbon steel is twice that of composite air cylinders, and the pollution is serious, which affects the safety of the brake. Aluminum alloy also has oxidation and pollution, and the cost is too high. Therefore, a double-cavity composite air cylinder with good sealing performance is needed to replace the traditional aluminum alloy air cylinder. SUMMARY

[0006] The purpose of the present application is to provide a double-cavity composite air cylinder with good sealing performance to solve the problems raised in the background.

[0007] To achieve the above purpose, the application provides the following technical scheme: a double-cavity composite air cylinder with good sealing performance, comprising a 15L cavity and a 20L cavity, the 15L cavity and the 20L cavity are fixed, a partition plate is arranged in the 20L cavity for reinforcement and support, a first air inlet and a first air outlet are arranged in communication with the side end of the 15L cavity, a first drain port is arranged at the bottom of the 15L cavity, two 15L cavities are arranged and welded and fixed in communication with the 20L cavity, a second air outlet and a second air inlet are arranged on the other side of the 15L cavity, a second drain port is arranged at the bottom of the other side of the 15L cavity, and a glass fiber coating layer is wrapped outside the 15L cavity and the 20L cavity.

[0008] The specific partition plate adopts a symmetrical conical structure for reinforced connection of the partition plate.

[0009] Specifically, the 20L cavity and the two 15L cavities on the sides form an integrated air cylinder.

[0010] Specifically, the first air inlet, the first air outlet, the second air outlet and the second air inlet are used for processing the gas inside the 15L cavity and the 20L cavity.

[0011] Specifically, the first drain port and the second drain port are arranged to perform drainage treatment in the 15L cavity and the 20L cavity.

[0012] Specifically, the glass fiber cladding layer is wrapped and covered by glass fiber.

[0013] The production method of the double-cavity composite air cylinder with good sealing performance comprises the following steps: S1, inner container forming After the engineering plastic particles are treated by vacuum drying, the double-cavity structure inner container is formed by injection molding through a multi-cavity mold, the engineering plastic is PA66+GF30 or PPS, the drying temperature is 80-100 DEG C, the drying time is 4-6 hours, the injection pressure is 120-150 MPa, two single-cavity inner containers are assembled by laser transmission welding, the welding energy density is 50-80 J / cm 2 , the welding speed is 2-3 m / min, and an integrated double-cavity inner container is formed. S2, composite material winding reinforcement An E-CR glass fiber (linear density 1600tex) and an epoxy vinyl ester resin (VE-812) are mixed at a volume ratio of 60-65%:40-35%, and a reinforcing layer is formed on the surface of the double-cavity inner container by a wet winding process, the winding angle is ±45° cross winding, and the winding tension is 50-80 N. S3, constant temperature curing The winding part is sent into a through-type curing oven and cured according to a three-stage temperature rising curve, 60 DEG C / 2h→100 DEG C / 4h→120 DEG C / 1h, and the curing degree is greater than or equal to 95%. S4, quality detection A helium mass spectrometer leak detector is used to detect the air tightness of the finished product under positive pressure (2.5 MPa) and negative pressure (-0.1 MPa) in two directions, the leakage rate is less than or equal to 1*10 -6 Pa·m 3 / s, the pressure holding test pressure is 2.0 MPa, and the pressure drop is less than or equal to 0.02 MPa in 24 hours.

[0014] Compared with the prior art, the beneficial effects of the present application are: The composite air cylinder with good sealing property can reduce the cost of automobile manufacturers by 20%, improve the safety factor, and with the rapid development of new energy vehicles in China, the amount of aluminum alloy will be larger in the future, and the price will also rise, if the composite air cylinder (the main raw material of the composite air cylinder is nylon inner barrel wrapped with glass fiber and epoxy resin) is selected, the cost can be better controlled, and the domestic chemical market demand can be promoted. BRIEF DESCRIPTION OF DRAWINGS

[0015] Fig. 1 It is a schematic diagram of the main structure of the application; Fig. 2 It is a bottom view of the main body of the application; Fig. 3 It is a side view of the main body of the application.

[0016] In the figure: 1-15L cavity; 2-first air inlet; 3-first air outlet; 4-first drain; 5-second drain; 6-second air outlet; 7-second air inlet; 8-glass fiber coating layer; 9-20L cavity; 10-separator. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only a part of the embodiments of the application, not all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the application.

[0018] Please refer to Figs. 1-3 The application provides a technical solution: a double-cavity composite air cylinder with good sealing property, comprising a 15L cavity 1 and a 20L cavity 9, the 15L cavity 1 and the 20L cavity 9 are fixed, the 20L cavity 9 is provided with a separator 10 for reinforcement and support, a first air inlet 2 and a first air outlet 3 are provided on the side end of the 15L cavity 1, a first drain 4 is provided at the bottom of the 15L cavity 1, two 15L cavities 1 are provided and are respectively welded and fixed in communication with the 20L cavity 9, a second air outlet 6 and a second air inlet 7 are provided on the other 15L cavity 1, a second drain 5 is provided at the bottom of the other 15L cavity 1, and the 15L cavity 1 and the 20L cavity 9 are wrapped with a glass fiber coating layer 8.

[0019] The separator 10 adopts a symmetrical conical structure for reinforced connection of the separator 10.

[0020] The 20L cavity 9 and the two 15L cavities 1 form an integrated air cylinder.

[0021] The first air inlet 2, the first air outlet 3, the second air outlet 6, and the second air inlet 7 are all used for the treatment of the gas inside the 15L cavity 1 and the 20L cavity 9.

[0022] The first drain outlet 4 and the second drain outlet 5 are set up to drain water from the 15L cavity 1 and the 20L cavity 9.

[0023] The fiberglass covering layer 8 is constructed by wrapping and covering with fiberglass.

[0024] A method for producing a well-sealed dual-cavity composite material gas storage cylinder includes the following steps: S1, Inner Liner Molding Engineering plastic granules are vacuum dried and then injection molded into a double-cavity inner liner using a multi-cavity mold. The engineering plastic is PA66+GF30 or PPS. The drying temperature is 80-100℃, the drying time is 4-6 hours, and the injection pressure is 120-150MPa. The two single-cavity inner liners are then assembled using laser transmission welding with a welding energy density of 50-80J / cm³. 2 The welding speed is 2-3 m / min, forming an integrated double-cavity inner liner; S2, Composite material winding reinforcement E-CR glass fiber (linear density 1600tex) and epoxy vinyl ester resin (VE-812) are mixed in a volume ratio of 60-65%:40-35% and a reinforcing layer is formed on the surface of the double-cavity inner liner through a wet winding process. The winding angle is ±45° cross winding and the winding tension is 50-80N. S3, Constant Temperature Curing The wound material is fed into a through-type curing oven and cured according to a three-stage temperature rise curve: 60℃ / 2h → 100℃ / 4h → 120℃ / 1h, with a degree of curing ≥95%; S4, Quality Inspection The finished product was tested for airtightness under both positive pressure (2.5 MPa) and negative pressure (-0.1 MPa) using a helium mass spectrometer leak detector. The leakage rate was ≤1×10⁻⁶. -6 Pa·m 3 / s, pressure holding test pressure 2.0MPa, pressure drop ≤0.02MPa after 24 hours.

[0025] Working principle: When needed, the user uses engineering plastic granules that have undergone vacuum drying, then injection molds them into a double-cavity inner liner using a multi-cavity mold. The engineering plastic is PA66+GF30 or PPS. The drying temperature is 80-100℃, the drying time is 4-6 hours, and the injection pressure is 120-150MPa. The two single-cavity inner liners are then assembled using laser transmission welding, with a welding energy density of 50-80J / cm³. 2The welding speed is 2-3 m / min, forming an integrated double-cavity inner liner. E-CR glass fiber (linear density 1600 tex) and epoxy vinyl ester resin (VE-812) are mixed at a volume ratio of 60-65%:40-35%. A reinforcing layer is formed on the surface of the double-cavity inner liner using a wet winding process. The winding angle is ±45° with cross-winding, and the winding tension is 50-80 N. The wound part is then placed in a pass-through curing oven and cured according to a three-stage temperature rise curve: 60℃ / 2h → 100℃ / 4h → 120℃ / 1h, achieving a cure degree ≥95%. A helium mass spectrometer is used to perform bidirectional airtightness testing on the finished product under positive pressure (2.5 MPa) and negative pressure (-0.1 MPa), with a leakage rate ≤1×10⁻⁶. -6 Pa·m 3 / s, holding pressure test pressure 2.0MPa, 24-hour pressure drop ≤0.02MPa, in the following steps: Nd:YAG laser (wavelength 1064nm) is selected. Before welding, the parting surface of the two single-cavity inner liner is fixed by positioning fixture. The parting surface is designed with a stepped structure to enhance the bonding strength. After welding, ultrasonic flaw detection is performed to ensure that the weld is defect-free. In the composite material winding reinforcement step: 5% nano silica modifier is added to the resin system to improve the temperature resistance Tg≥120℃. The number of winding layers is 8-12 layers. The end adopts a locking ring structure to prevent fiber slippage. In the constant temperature curing step: a temperature sensor and PID control system are set in the curing oven to adjust the temperature in real time. Thermal power is used to ensure a temperature fluctuation range of ±2℃. After curing, the degree of curing is tested using the DSC method. Products that do not meet the standards are re-entered into the curing oven for further curing. The quality inspection steps also include: burst pressure test: static burst pressure ≥4.5MPa; cyclic fatigue test: 100,000 pressure cycles (0-2.0MPa) without leakage; bending fatigue test: bending radius 500mm, 100,000 cycles without cracks; post-processing steps: CNC machining of interface threads (M18×1.5) and sealing grooves on the cured gas cylinder, with a dimensional tolerance of ±0.05mm; spraying of anti-corrosion coating with a thickness of 80-100μm; salt spray resistance test ≥1000 hours, and the work is completed.

[0026] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A dual-cavity composite material gas storage cylinder with good sealing performance, characterized in that: It includes a 15L cavity (1) and a 20L cavity (9). The 15L cavity (1) and the 20L cavity (9) are fixed. The 20L cavity (9) is provided with a partition (10) for reinforcement and support. The side end of the 15L cavity (1) is connected to a first air inlet (2) and a first air outlet (3). The bottom of the 15L cavity (1) is provided with a first drain outlet (4). There are two 15L cavities (1), which are connected to the 20L cavity (9) and welded and fixed respectively. The other side of the 15L cavity (1) is provided with a second air outlet (6) and a second air inlet (7). The bottom of the other side of the 15L cavity (1) is provided with a second drain outlet (5). The 15L cavity (1) and the 20L cavity (9) are wrapped with a fiberglass covering layer (8).

2. The dual-cavity composite gas storage cylinder with good sealing performance according to claim 1, characterized in that: The partition (10) adopts a symmetrical conical structure to strengthen the connection of the partition (10).

3. The dual-cavity composite gas storage cylinder with good sealing performance according to claim 2, characterized in that: The 20L cavity (9) and the 15L cavities (1) on both sides form an integrated gas storage cylinder.

4. The dual-cavity composite gas storage cylinder with good sealing performance according to claim 3, characterized in that: The first air inlet (2), the first air outlet (3), the second air outlet (6), and the second air inlet (7) are all used for the treatment of the gas inside the 15L cavity (1) and the 20L cavity (9).

5. The dual-cavity composite gas storage cylinder with good sealing performance according to claim 4, characterized in that: The first drain outlet (4) and the second drain outlet (5) are set to drain water from the 15L cavity (1) and the 20L cavity (9).

6. The dual-cavity composite gas storage cylinder with good sealing performance according to claim 5, characterized in that: The fiberglass covering layer (8) is made of fiberglass.

7. A method for producing a well-sealed double-cavity composite material gas storage cylinder, comprising the well-sealed double-cavity composite material gas storage cylinder as described in claim 6, characterized in that, Includes the following steps: S1, Inner Liner Molding Engineering plastic granules are vacuum dried and then injection molded into a double-cavity inner liner using a multi-cavity mold. The engineering plastic is PA66+GF30 or PPS. The drying temperature is 80-100℃, the drying time is 4-6 hours, and the injection pressure is 120-150MPa. The two single-cavity inner liners are then assembled using laser transmission welding with a welding energy density of 50-80J / cm³. 2 The welding speed is 2-3 m / min, forming an integrated double-cavity inner liner; S2, Composite material winding reinforcement E-CR glass fiber (linear density 1600tex) and epoxy vinyl ester resin (VE-812) are mixed in a volume ratio of 60-65%:40-35% and a reinforcing layer is formed on the surface of the double-cavity inner liner through a wet winding process. The winding angle is ±45° cross winding and the winding tension is 50-80N. S3, Constant Temperature Curing The wound material is fed into a through-type curing oven and cured according to a three-stage temperature rise curve: 60℃ / 2h → 100℃ / 4h → 120℃ / 1h, with a degree of curing ≥95%; S4, Quality Inspection The finished product was tested for airtightness under both positive pressure (2.5 MPa) and negative pressure (-0.1 MPa) using a helium mass spectrometer leak detector. The leakage rate was ≤1×10⁻⁶. -6 Pa·m 3 / s, pressure holding test pressure 2.0MPa, pressure drop ≤0.02MPa after 24 hours.

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