High-pressure vessel and method of its making

FIELD: automotive industry.

SUBSTANCE: high-pressure vessel comprises load-bearing shell made of a composition material, sealing shell, coaxial metallic connecting pipes with flanges embedded in the sealing shell, and nuts screwed on the connecting pipes. The sealing shell is made of two interconnected composition hemispherical molded shells. The method comprises winding composition layer on the preliminary prepared sealing shell and polymerizing the layer. The sealing shell is made of two half shells provided with openings for connecting pipes. Each shell is molded from the composition material with the use of punch and mold. The connecting pipes are glued. The half shells are interconnected. The outer load bearing shell is wound, and it is additionally secured to the connecting pipe through a nut.

EFFECT: enhanced permissible loading and decreased weight and cost.

4 cl, 1 dwg

 

The technical field

The invention relates to the field of engineering, to create vessels large amount of working under high pressure (200 kgf/cm2and above), and the method of their manufacture and can be used in all fields of engineering, where are the vessels, in particular in motor vehicles to gas fuel, such as methane.

The level of technology

Typical mileage of vehicles equipped with gas equipment of high pressure between the pump usually does not exceed 30-50% of the mileage of conventional gasoline. This leads to the need for more to fill the car, i.e. to have a large number of gas filling stations, high pressure, and imposes severe requirements on the physical specifications of CNG equipment as being the car, and getservice.

At the same time, the prevalence of methane, its relative cheapness and environmental safety emitted during combustion products makes its use as fuel is extremely promising in the near future, given the rapid depletion of world reserves of liquid hydrocarbons and relatively lightimage gas - propane.

Despite its apparent simplicity and wide popularity of the used pressure vessels, plenty of designs, used materials and manufacturing techniques, and is also their wide use in various fields of technology, the creation of pressure vessels large volumes (hundreds and thousands of liters), with good performance at a low price level and suitable for filling with methane, is a difficult task.

Known composite container and method of manufacture [1]. This container for the storage and supply of liquid and gaseous environments of high pressure is a shell of the inner metal layer and an outer composite layer. The shell contains a shell of sheet metal, the boss and the neck, interconnected by welding. In order to reduce the mass of the cylinder, the thickness of the metal layer δmethand the thickness of the composite layer δcomselected ratio δmeth=(0,1-0,2)δcom.

The container is made as follows. Into the internal cavity of the metal shell to provide resistance to external pressure during the subsequent winding of the composite layer, through the mouth of introducing granular material to completely fill and seal (e.g., vibration). In the cavity of the mouth establish a tube, which is also the rear axle. The boss set the front trunnion. The metal shell through the front and rear axles mounted on the winding machine and produce the winding kanaroglou the surface of the metal layer of the composite layer. The container is placed in a heat chamber for polymerization of the composite material, after which the balloon is then removed from the heat chamber.

However, such constructs vessels with internal metal shell does not allow to achieve a high enough load capacity of the container are of great weight, low reliability when tested in cyclic loading. To reduce the thickness of the metal shell can only to a certain limit, because it is the technological frame must have sufficient rigidity to provide the necessary tension of the glass strands in the winding of the composite shell. With increasing size and capacity of cylinders of the requirements for rigidity and stability of the metal shell is even harder.

The disadvantage of this combined container and method of its manufacture is the fact that due to significant differences in the module of elasticity of the metal shell and the reinforcing composite shell cannot create the optimal design of the container, where both shells are full. To achieve high strength pressure vessel composite shell execute preloaded. As a result, when the discharge pressure of the inner metal shell is overloaded, receiving permanent deformation, and because of this is has low tensile cyclic load.

The closest to the technical nature of the claimed invention is a pressure vessel made of composite materials [2]. The pressure vessel contains a power shell made of composite material, sealing the shell of an elastic polymer and a coaxial metal fitting with flanges, sealed in the sealing membrane, and miscellaneous washers and screwed on the fitting nuts, clamps power and sealing membrane between the flange fitting and slip washer. Between sealing and weight shells set of washers with flat areas on the inner diameter and tapered pins on the surface in contact with power shell. Moreover, the protrusion of the pins above the surface of the spacers of 1~2 mm less than the calculated thickness of the power shell made of composite material, and fittings in the contact zone with additional washers are made flat response of flats.

The pressure vessel is manufactured as follows. Before winding power shell for fitting wearing an extra washer contacting a smooth surface with the flexible sealing membrane, and the flat surfaces on the inner diameter of the washer with a response similar flats on the fitting. Pressed in an additional washer pointed the s pins protrude above the surface of the washer, contact with power shell size 1-2 mm When the winding of high strength, coated with a polymer binder thread stack layers between the pins until then, until it reaches the calculated thickness, as well as the height of the pins is less than this value, they are fully samotnie, and after hardening polymeric binder tightly sealed in composite power shell. After the winding of the power of the shell, before taking in the electric furnace of the polymerization process on the fitting set invoice washer and screw threaded nut, which provide a tight pressure sealing and power shell to the flange of the fitting. Pointed pins, trapped tightly embedded in the composite material shell, to preclude rotation of the washer with the largest values of torque and a flat surface on the inner diameter of the washer and the response of the flats on the fitting prevents the latter from turning when the same act on it twisting effort.

The disadvantages of the prototype is the lack of possibility of creation of a high-pressure vessel is large in size with simple and adaptable to the execution of the design, which ensure its maximum durability even under cyclic loading and minimum sensitivity to termdefinition.

The invention

An object of the invention is the creation of a high-pressure vessel is large in size with simple and adaptable to the execution of the design, which ensure its maximum durability even under cyclic loading and minimum sensitivity to termdefinition.

The technical result of the invention is to increase the allowable load characteristics of the vessel while maintaining the simplicity and adaptability of its manufacture, as well as reducing weight and cost.

The technical result of the claimed device is achieved in that in the pressure vessel, including power shell made of composite material, sealing the envelope and coaxial metal fitting with flanges, sealed in the sealing membrane, and screwed on the fitting nuts, what's new is that the sealing sheath made of two composite hemispherical molded shells that are joined together into a “lock”the joint which is fixed with a belt made from a composite material.

In the device according to claim 2 what is new is that the power and sealing sheath made of a material with a similar modulus of elasticity, the thickness of the power of the shell in the area of fitting and interface paleobiologic more than in other areas of the shell.

In the second paragraph of the method of manufacture of the pressure vessel, the thickness of the sealing sheath choose the size that provides rigidity and stability during the winding of the filaments of the composite material of the outer power shell. These differences allow us to create a pressure vessel with high permissible load characteristic of the vessel, while maintaining the simplicity and adaptability of its production, reducing weight and cost.

Will show in what way the above technical result on paragraphs 1-2 of the inventive pressure vessel.

Performing a sealing membrane of the two composite hemispherical who ormoving shells with holes for fittings, interconnected in a “lock”the joint which is fixed a belt made of composite material, enables you to get strong and rigid internal frame. Because fiberglass has a higher specific strength (ratio σin/γ), in comparison with steel and most durable aluminum or titanium alloys, there is a real opportunity to reduce the weight of the vessel and its value.

Run power and sealing sheath made of a material with a close modulus of elasticity, thickness, power shell in the area of fitting and interface paleobiologic greater than in other zones of the shell, allows you to create Ravnopravie under cyclic loading composite pressure vessel.

Will show in what way the above technical result on paragraphs 3-4 of the proposed method of manufacture of the pressure vessel.

Execution germetezirujushie shell of two paleobiologic, each of which is formed of a composite material using the punch and die set for glue fitting, connect paleobiology by means of glue into the lock, the joint is fixed with a belt made from a composite material, enables you to create a design sealing sheath simple technological design and rugged, light weight and cost. The implementation of the giving of the winding external power shell and additional pinning her to the fitting by means of nuts increases the allowable load characteristics of the vessel.

The choice of thickness of the sealing membrane is determined as follows. Sealing the membrane must perceive pressure, which is implemented with the winding force of the layer of reinforcing threads in the device for orbital winding. In addition, she must perceive console loading arising from the tension placed on the mandrel reinforcing threads.

With this choice there is a real possibility of making high-strength composite vessel.

The inventive pressure vessel shown in the drawing in cross-section: item 1 - cover, sealing, 2 - socket, 3 - nut, pos.4 - belt reinforcing, pos.5 - sheathed power, pos.6 - nut.

The pressure vessel includes a sealing membrane 1 made of two molded hemispheres, the holes are coaxially installed fitting 2 and fastened with glue and screws 3. The junction of the hemispheres fortified belt 4 made of composite material, on top of which the sealing membrane is wound power shell 5 and is attached to the fittings with nuts 6.

The invention is carried out as follows. To obtain sealing fiberglass shell 1 is formed using the punch and die by vyklicky of fiberglass soaked in resin, separately two thin-walled floor is blocki, having holes to accommodate fittings 2. On paleobiology on glue set fitting 2, fix them with nuts 3. Paleobiology 1 are connected to each other, sticking their “castle”. Adhesive joint has low tensile strength in shear, so the joint molded paleobiologic additionally fasten the reinforcing belt 4 made of composite material located on top of the adhesive interlocking connection. Then carry out the winding of the reinforcing threads of the power of the shell 5. Winding the reinforcing filaments on the mandrel spherical shape is characterized by complete automation of the winding cycle and high performance process provides uniform distribution of zones of laying on the surface of the spherical shape. After winding power shell 5 is additionally fixed to the socket 2 by means of nuts 6.

The company carried out theoretical substantiation of the health of the invention, carried out a design study of the device in General and composite nodes, work is underway to test the model sample.

When designing a pressure vessel was taken into account the following points. From the point of view of strength of the sealing membrane must perceive pressure, which is implemented with the winding force of the layer of reinforcing threads in the device for orbital n the coils. In addition, it must perceive console loading arising from the tension placed on the mandrel reinforcing threads. Based on these loads, choose the thickness of the inner sealing sheath and reinforcing the glue seam of the belt.

When designing fitting - cap cameras incorporate conditions to ensure its strength when torque loading that occurs when tightening (loosening) of the valve during operation of the camera. To ensure this condition on the power shell on glue install additional metal nut, providing a reliable connection of the fitting to the power shell.

The thickness of the layer of reinforcing yarns power shell and the distribution of the number of turns of winding is determined from conditions provide the necessary reserves of strength, requirements for cyclic strength, etc. recorded in the technical specifications, in the Russian and international standards, taking into account the additional hardening of the shell in the area of bonding.

Calculations showed that this construction of the vessel allows you to effectively use the strength of the material properties of both the membrane and the reinforcing belt, because all these elements are made of a homogeneous material with the same elastic modulus. Calculation and optimization of the geometrical sizes of all items is to provide them equal power loading, and accordingly the same strain. In addition, the quality of bonding and strength properties of adhesive joints homogeneous materials is significantly higher due to the high adhesion and uniform deformation under loading.

All these measures together can significantly improve the qualitative characteristics of the vessel, while maintaining the simplicity and manufacturability of the design.

Due to its advantages of the proposed composite pressure vessel will be used for storage and transportation trudnosgoraemyh gases will be used, for example, as containers for mobile getservices high pressure.

Sources of information

1. Patent RU No. 2058507 class. F 17 1/00, publ. 1996).

2. Patent RU No. 2051308. F 17 1/16, publ, 27.12.1995)

1. The pressure vessel includes a power shell made of composite material, sealing the envelope and coaxial metal fitting with flanges, sealed in the sealing membrane, and screwed on the fitting nut, characterized in that the sealing membrane is made of two composite hemispherical molded shells that are joined together into a "lock"the joint which is fixed with a belt made from a composite material.

2. The pressure vessel according to claim 1, characterized in that the power and sealing sheath made of a material with a close mo the Ulema of elasticity, the thickness of the power of the shell in the area of fitting and interface paleobiologic more than in other areas of the shell.

3. A method of manufacturing a pressure vessel, comprising winding the composite layer on the prefabricated sealing membrane and its polymerization, characterized in that the sealing membrane is made of two paleobiologic with holes for fittings, each of which is formed of a composite material using the punch and die into the glue set fitting, connect paleobiology by means of glue into the lock, the joint is fixed with a belt made from a composite material, and then carry out the winding of the external power shell and in addition fix it on the fitting through the nuts.

4. A method of manufacturing a pressure vessel according to claim 3, characterized in that the thickness of the sealing sheath choose the size that provides rigidity and stability during the winding of the filaments of the composite material of the outer power shell.



 

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