Automotive gas metallic composite cylinder

FIELD: automotive industry.

SUBSTANCE: cylinder is made of metallic cylinder liner wound with a composite material. The thickness of the composite winding exceeds the thickness of the wall of the metallic liner at least by a factor of three. The ratio of the gas volume at the collapsing pressure to the cylinder mass is determined from the inequality proposed.

EFFECT: increased pressure of the cylinder charge.

1 dwg

 

The invention relates to a gas automotive equipment used to store and work on compressed natural gas (CNG).

Known automobile gas metallotherapeutic cylinders, made in the form of a steel liner balloon type, the cylindrical portion of which is wound with fiberglass [1].

These cylinders are made on a working pressure of 20 MPa and are characterized by the following indicators:

1. The specific gravity, the ratio of the mass of the cylinder to its geometrical volume is 0.65-0.75 kg/l

2. The thickness of the fiberglass winding is greater than the wall thickness of the metal liner is not more than 2 times.

3. The allowable stress in the metal liner should not exceed 0.6 σT.

When specified parameters and constraints on the strength of the liner cylinders such designs are relatively heavy and expensive, which is especially apparent at the transition to higher gas pressures, for example 32-40 MPa instead of 20 MPa. The coefficient of perfection of the design of such cylinders, defined as the ratio of gas volume by destructive pressure to the mass of the cylinder does not exceed “10”, which characterizes the aforementioned drawback.

The closest prototype of the claimed container is a metal-composite cylinder made in the form of alumi avago liner balloon type, wrapped in the cocoon of composite material, with a unit weight of a cylinder of 0.6-0.7 kg/l and exceeding the thickness of the composite winding over the wall thickness of the liner is not more than 2 times [1].

The drawback of this design of the container is also a low value of coefficient of design perfection, not exceeding the values “10”, which ultimately leads to a relative increase in the specific mass and cost of the container. This is especially evident in the creation of cylinders at a gas pressure of more than 20 MPa.

The technical objective of the present invention is to achieve a relative reduction of weight and cost of the tank at the gas pressure of more than 20 MPa.

This task is achieved by the fact that metal-composite cylinder made of a metal liner balloon type, wrapped in the cocoon of a composite material, whose thickness is not less than 3 times the wall thickness of the liner for different volumes and pressures in the gas tank, and the ratio of gas volume by destructive pressure to the mass of the cylinder is defined by inequality

(1)

where KSK - factor design perfection;

The rrab. - maximum working pressure in the gas tank in kgf/cm2;

V - geometric internal volume of the container in liters, (DM3);

n - factor strength is, equal to not less than 3;

M is the mass of the cylinder in kg;

RAZR. - destroying the gas pressure in kgf/cm2.

The drawing shows a gas metal-composite cylinder for vehicles (a) and for mobile avtogazozapravnih (b) at the maximum operating gas pressure 32 MPa, and table 1 shows their basic parameters.

Table 1
№№ p/pVolume,

liter
Weight,

kg
The ratio of the thickness of the winding to the wall thickness of the linerThe ratio of design perfection, km
and67,053,0of 3.4612,14
bto 185.0138,75of 3.4612,8

Cylinders made in the form of aluminum liner balloon type, wrapped composite material, the thickness of which exceeds almost 3.5 times the wall thickness of the liner, and the ratio of gas volume by destructive pressure to the mass of the container (factor design perfection) exceeds 12 km according to inequality (1).

The increasing thickness of the composite winding from 2.0 to 3.5 times at higher working pressures from 20 to 32 MPa has allowed us to create cylinders with aspect design perfection more than 12, relatively light, achevie and highly reliable.

Sources of information

1. GAS transport INFO, page 4, may - April, 1997

Automotive gas metal-composite cylinder made in the form of a metallic liner balloon type, wrapped in the cocoon of composite material, characterized in that the thickness of the composite winding is greater than the wall thickness of the metal liner not less than 3 times, and the ratio of gas volume by destructive pressure to the mass of the cylinder is determined by the inequality:

where KSC- coefficient design perfection;

Pslave.- maximum working pressure in the gas tank, kgf/cm2;

V - geometric internal volume of the cylinder, liter, (DM3);

n - factor of safety equal to not less than 3;

M is the mass of the cylinder, kg;

Pbit.- destroying gas pressure, kgf/cm2.



 

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