CN203273275U - Steel wire winding structure high-pressure gas cylinder - Google Patents
Steel wire winding structure high-pressure gas cylinder Download PDFInfo
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- CN203273275U CN203273275U CN 201320153676 CN201320153676U CN203273275U CN 203273275 U CN203273275 U CN 203273275U CN 201320153676 CN201320153676 CN 201320153676 CN 201320153676 U CN201320153676 U CN 201320153676U CN 203273275 U CN203273275 U CN 203273275U
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Abstract
The utility model discloses a steel wire winding structure high-pressure gas cylinder which comprises a metal internal container and a winding reinforcement layer, wherein the external surface of the metal internal container with compressive pre-stress is continuously wound by a steel wire or steel strip with tensile pre-stress in a unistrand or multistrand mode to form the multilayer winding reinforcement layer; the winding reinforcement layer tightly covers the external surface of the metal internal container of the gas cylinder; the cross section of the steel wire or steel strip is in the shape of a flat circle, well-rounded square, rectangle, trapezoid or circle; the diameter of the steel wire or the thickness of the steel strip is not greater than 0.3 millimeter; and the strength of the steel wire or steel strip is not less than 3500 MPa. After the inner container of the steel wire winding structure III-type high-pressure gas cylinder, which is formed by adding the steel wire winding layer on the whole external surface of the I-type steel cylinder, is subjected to self-tightening, the working pressure borne by the gas cylinder can be enhanced from 25 MPa to above 35Mpa; and the utility model has the advantages of higher use safety and longer fatigue life.
Description
Technical field
The utility model relates to high-pressure bottle, particularly relates to a kind of gas cylinder for accumulating compressed natural gas (CNG), compression hydrogen and other compression industrial gas, and its rated working pressure more is applicable to the occasion greater than 25MPa.
Background technique
Gas cylinder, the incipient stage of accumulating compressed natural gas and other industrial gas all adopted seamless alloy steel pipe (or seamless alloy aluminum pipe) manufacturing, through spinning and quenching with Subsequent tempering, be made for integrally-built seamless, non-welded vessel (being called I type gas cylinder).Described I type gas cylinder when fully loaded work, its near surface within the cylindrical shape position at two ends, be the dangerouse cross-section of gas cylinder, the tangential stress that bears is maximum.Calculated stress during design (as mises stress) should be arranged to the allowable stress value less than material.I type gas cylinder exists the danger of unexpected explosion: when in a single day internal surface crackle occurred, the speed of its expansion was very fast, was easy to the serious accident that forms the gas cylinder explosion, even explodes.Therefore, I type gas cylinder is all taked: the design method of selecting high duty alloy Steel material and increasing safety coefficient; And take strict quality control and strict third party's measures for the supervision, guarantee its Security.This has also caused the deadweight of gas cylinder very large.The pressure of I type gas cylinder stored-gas generally is not more than 25MPa, and the volume by weight efficient of stored-gas (volume to weight ratio=volume/deadweight) is very low.
The I type gas cylinder of accumulating compressed natural gas, can be divided into two classes by purposes: vehicle gas cylinder and station gas cylinder.Vehicle gas cylinder is the fuel reserve container of Natural gas vehicles, and the standard that the automobile-used steel cylinder of I type CNG is followed is GB17258-1998/CNG " steel seamless, gas cylinder " or ISO11439, and rated working pressure is 20MPa; Standing with gas cylinder is the reservoir vessel that natural gas filling station uses, and the standard that I type CNG follows with gas cylinder at the station is ISO11120, and rated working pressure is 25MPa.I type gas cylinder adopts the high strength alloy structured steel pipe as raw material, the operations such as (not allowing welding), integral quenching, high-temperature tempering, processing whorl of bottleneck hole, shot blasting inner and outer surface, nondestructive inspection, thickness measure inspection, outer surface anticorrosive coating etc. that are shaped through the two ends hot spinning, order is processed; In addition, also to carry out narrow examination and test to gas cylinder: the pressurize test under the hydrostatic pressing of 1.5 times of values of working pressure (1.5P); Air tightness test under working pressure (P); The hydrostatic pressing fatigue life test (1.5P) of bulk article sampling observation product (1/200); Hydraulic bursting test (2.5P); Etc..Just can guarantee to dispatch from the factory product quality, reach the requirement of relevant criterion.
In used gas cylinder, also have the gas cylinder of three kinds of composite structures: all the outer surface at cylinder liner is being wound around the reinforcing fiber layer, belongs to the gas cylinder of winding structure, respectively with II, III, the statement of IV type.Also divide vehicle gas cylinder (applied code ISO11439) and station with gas cylinder (applied code ISO11119), generally be middle-size and small-size gas cylinder (its water capacity is no more than 450 liters).
II type gas cylinder is the composites gas cylinder that cylinder position, the hoop in the steel inner container outside is being wound around the reinforcing fiber layer, commonly the glass fibre ring twines steel cylinder (applied code: a car bottle ISO11439 or station bottle ISO11119-1), be used for compressed natural gas and general industry gas that pressure store is not more than 25MPa; III type gas cylinder is on all surfaces of metal inner tube outside, all is tied with the composites gas cylinder (applied code ISO11439 and ISO11119-2) of reinforcing fiber layer, and kind has: glass fibre twines steel cylinder (being of little use) entirely, carbon fiber entirely twines steel cylinder (being used for CNG or other industrial gas that pressure store surpasses 25MPa) and carbon fiber twines Aluminum Bottle (compression hydrogen that is used for pressure store 35～70MPa) entirely.The price comparison of III type gas cylinder is expensive, but the pressure of stored-gas can be significantly increased than II type gas cylinder; IV type gas cylinder is on all surfaces of nonmetal inner bag outside, is wound around the composites gas cylinder of carbon fiber enhancement layer, is used for storing corrosive gas.Its deadweight is very light, and price is also more expensive.Some country is very not relieved to the tightness of the gas cylinder of nonmetal inner bag, does not allow to use; II, III, three kinds of gas cylinders of IV type all outside the tank the surface be wound around the reinforcing fiber layer, all belong to the gas cylinder of prestressed structure, the manufacture process of such cylinder liner is all identical with above-mentioned I type gas cylinder with quality requirement, only the surface has increased winding layer outside the tank.Gas cylinder all will apply over the hydrostatic pressing self intensification of its yield strength limit inner bag before dispatching from the factory and process, and inner bag and winding layer are fitted.The hydraulic pressure releasing is rear, inner bag has residual deformation, causes winding layer and inner bag all to produce prestressing force (inner bag produces compressive pre-stress, and winding layer produces pre-tensile stress), and this method is called the inner bag self-tightening.Part work tensile stress in the time of can offsetting the fully loaded work of inner bag.Thereby all than the deadweight of I type gas cylinder for light: the deadweight of II shaped steel bottle is equivalent to 2/3 of I shaped steel bottle; The deadweight of III type Aluminum Bottle and IV type gas cylinder, only be equivalent to 1/3 of I shaped steel bottle.
For example, Fig. 1 has shown the present I type gas cylinder 100 ' (being called again long tube gas cylinder) that is used for the CNG gas transportation vehicle, and its rated working pressure is 25MPa, and applied code is ISO11120.Described I type gas cylinder 100 ' is under unloaded state, and inner bag 101 ' does not stress; Under full load condition, on the internal surface of inner bag 101 ' dangerouse cross-section, bear larger circumference tangential stress.Its failure mode is the excessive stretching crackle that causes of tangential stress, and crackle appears on the direction parallel with the gas cylinder bus (longitudinal crack).The computational methods that provide according to relevant international standard: when the material of gas cylinder 100 ' be 4130X, when working pressure is 25MPa, the gas cylinder of 559 millimeters of external diameters, 11000 millimeters of length, allowable stress is 880MPa.The minimum wall thickness (MINI W.) that calculates should be 17.3 millimeters, load water capacity is that 2200 liters, deadweight are 2845 kilograms.I type gas cylinder relies on the intensity of material itself to go to guarantee its Security fully, is very strict to material and heat treated requirement; The length direction of gas cylinder is equipped with safety installations, discharges gas when being used for superpressure, overtemperature.When gas cylinder length surpasses 1500 millimeters, must safety installations be housed at the gas cylinder two ends.
For example, Fig. 2 II type station of having shown another kind of storage CNG is with gas cylinder 100 ".Rated working pressure is 25MPa, and gas cylinder length is 1955 millimeters, and safety installations is equipped with at gas cylinder two ends, and loading water capacity is 200 liters, and applied code is ISO11119-1.Described II type gas cylinder 100 " comprising: steel inner container 101 " and hoop be wrapped in inner bag 101 " the glass-epoxy layer 102 of outer surface ", be called the glass fibre ring and twine steel cylinder.Described II type gas cylinder, process self intensification are processed, can be formed pre-stressed state: inner bag 101 " bear compressive pre-stress when gas cylinder is unloaded, full load, the work tensile stress of inner bag is subdued mutually with compressive pre-stress, can improve its stress; Outside reinforcing glass layer of fibers can cushion the expansion of inner bag crackle, has played the safety effect that prevents the unexpected explosion of inner bag.The inner bag wall thickness that calculates gained is 6.1 millimeters; The material of selecting is 30CrMo4; The thickness of glass pricker dimension circumferential winding layer is 10 millimeters; The selection of material is the glass pricker dimension bundle that has flooded epoxy resin; The gas cylinder deadweight is 173 kilograms; Described II type gas cylinder from important than isometric I type gas cylinder weight reduction approximately 1/3.
Fig. 3 has shown the III type vehicle gas cylinder 100 ' of another kind of storage compression hydrogen ", rated working pressure is 35MPa.Described III type gas cylinder 100 ' " comprising: aluminium alloy inner container 101 ' " and be wrapped in inner bag 101 ' " the carbon fiber winding layer 102 ' of outside all surfaces ", be called carbon fiber and entirely twine Aluminum Bottle.It is also the prestressing force gas cylinder of inner bag self-reinforced structure.Shown in the III type carbon fiber nominal capacity that entirely twines Aluminum Bottle be 128 liters, deadweight is 67 kilograms, also will alleviate approximately 1/2 weight than isometric II type gas cylinder., only need at an end of gas cylinder, safety installations is set less than 1500 millimeters due to the length of gas cylinder.
Along with the expansion of human society for rock gas, hydrogen, combination gas etc., automobile-used Gas Energy Source demand, the rated working pressure of gas cylinder also needs progressively to improve: the rated working pressure of compression hydrogen air cylinder has been increased to 70MPa; The storage working pressure of the compression combination gass such as rock gas (CNG) and hydrogenating gas (HCNG) also can require to bring up to the grade of 35MPa.Like this, just can guarantee to use the automobile of gaseous fuel can have enough lasting distance travelleds (should reach more than 300 kilometers).This will propose Secretary to gas cylinder, must break through 25MPa, reach a higher class 35MPa.And at present, except expensive III type carbon fiber twines Aluminum Bottle entirely, there is no that cost compare is cheap, the gas cylinder of other high strength winding materials that can produce in enormous quantities comes out, namely also do not have other lower-cost gas cylinders to come out.Affect the popularization of the vehicular gaseous propellant energy and enlarged and used, also affected the technological progress of gas cylinder.
By State Intellectual Property Office of the People's Republic of China on 08 08th, 2012 issue, mentioned patent of invention---" gas cylinder " (application number is 201010270692.3) in notice of authorization (notice of authorization number be CN101936452B), be a kind of Novel-structure high-pressure gas cylinder (I am also one of inventor) that occurs in document in recent years.Document has proposed in winding process, has used the method that applies very large pretensioning, and high-tensile steel wires are wrapped in outer surface of liner, can design the steel wire winding gas cylinder of prestressed structure, can improve the pressure store of gas cylinder.But inner bag is applied prestressed method for it and the utility model patent has obvious difference: last invention is by in winding process, directly inner bag is applied enough compressive pre-stresses by steel wire; And the utility model patent is not when winding steel wire, apply prestressing force, need to process, just to make inner bag generation compressive pre-stress by the inner bag hydraulic pressure self intensification before dispatching from the factory inner bag; The utility model patent can take full advantage of existing weaponry and equipment and the technology of gas cylinder manufacturing works, can simplify the winding process of Steel Tendon, can design and manufacture fairly simple, easily the gas cylinder of steel wire winding structure.
Should say, the steel wire winding gas cylinder that applies prestressed steel wire gas cylinder and inner bag self intensification in winding process is all the innovation of gas cylinder, be all to utilize high-tensile steel wires, this cheap and have very high-intensity wound wire to make the design of a kind of novelty of gas cylinder, method processed, all can promote architecture advances and the technological progress of gas cylinder.To be a kind of intensity be significantly less than the Novel wound wire rod of carbon fiber near carbon fiber, (but deadweight is greater than carbon fiber) cost to high-tensile steel wires, is a kind ofly can promote the ultrahigh pressure gas cylinder (pressure store is in 25～35MPa) practical techniques that realize low-cost and industrialization.
Two kinds of methods are that pluses and minuses are respectively arranged.The advantage that prestressing force is wound around is: can accurately design the stress phase with the anticipation gas cylinder, still, the technique new problem that runs in the process of winding steel wire is more, for example: the start processing at place, ending place, fracture of wire place of Steel Tendon; Also need to increase new Wiring apparatus, could realize prestressed control in winding process.The advantage of self-reinforced structure is: the technique inheritance is good; Need not to process technique and quality problems in winding process; Also need not to increase new equipment.But more deep mechanical analysis is determined, needed to the parameter of self intensification; Sentence the hydrostatic test that result need to be by gas cylinder, through relatively and after revision could finally determining.
One side according to the utility model patent, a kind of gas cylinder is provided, described gas cylinder is used for accumulating high pressure industrial gas and various high-pressure gas, comprises metal inner tube and steel wire winding layer, and described winding layer adopts the intensity of high-tensile steel wires (or steel band) to be not less than 3500MPa; Described high-tensile steel wires (or steel band), sub-thread or multiply are wrapped in whole outer surfaces of described metal inner tube continuously, form multi-lamellar parallel organization; Described gas cylinder before dispatching from the factory, to metal inner tube impose over its yield limit, the hydrostatic pressing self intensification processes, and makes inner bag produce to a certain degree, expendable plastic deformation; After cancelling hydraulic pressure, just form the prestressing force of mutual balance between the inner bag of gas cylinder and steel wire floor: compressive pre-stress appears in inner bag, and pre-tensile stress appears in steel wire floor.This high-tensile steel wires (or steel band) of using replace carbon fiber as the ultrahigh pressure gas cylinder that strengthens winding layer, except the weight of weight greater than the carbon fiber winding layer of steel wire winding layer, there is no other shortcomings: also can be under the prerequisite that guarantees gas cylinder intensity and safety, farthest reduce the use amount of liner material, realize higher pressure store; Cost can reduce greatly; (carbon fiber strength used of current gas cylinder is about 4000MPa, and unit price is about 40 dollars/kilogram; High-tensile steel wires intensity is 3500MPa, and unit price is about 20 yuans/kilogram)
In view of this, the utility model patent need to provide a kind of gas cylinder, and described gas cylinder should be able to adapt to higher storage nominal operating pressure, (surpass 25MPa, reach 35MPa); Also to possess condition low-cost and that realization is produced in enormous quantities, and will guarantee being perfectly safe of gas cylinder using process links.
The model utility content
For achieving the above object, the utility model provides a kind of gas cylinder of steel wire winding structure, it comprises metal inner tube and is wound around reinforced layer, technical characterstic is to be wound around continuously by the steel wire with pre-tensile stress or steel band sub-thread or multiply at the outer surface of the metal inner tube with compressive pre-stress, be formed with multi-lamellar winding reinforced layer, be wound around the outer surface that reinforced layer closely covers described gas cylinder metal inner tube; The cross section of described steel wire or steel band is oblateness, the square with fillet, rectangle, trapezoidal or circular; The thickness of described gauge of wire or steel band is not more than 0.3 millimeter; The intensity of described steel wire or steel band is not less than 3500MPa.
Further technical characterstic is, between the tow and tow of the winding reinforced layer that described steel wire or steel band form, between layers, with the binder dipping, skin is pressing internal layer, is parallel organization.
Further technical characterstic is, the material of described steel wire or steel band is that carbon content surpasses 0.7% high carbon steel or high-carbon low-alloy steel.
Further technical characterstic is, the material of metal inner tube is low-alloy structural steel or aluminum alloy.
Further technical characterstic is, during described steel wire winding, forms existing circumference circumferential winding layer, again axial winding layer is arranged, and can apply axial and tangential constraint and enhancing to cylinder liner.
The utility model patent (a kind of gas cylinder of steel wire winding structure) can reach following technique effect significantly:
1, at the outer surface that has I shaped steel bottle now, by setting up steel wire winding layer, formed steel wire winding III type gas cylinder, through after the inner bag self-tightening, can make more than working pressure that gas cylinder bears brings up to 35MPa from existing 25MPa, potentiality are pressed in the storage that is used for improving I shaped steel bottle;
2, in the situation that the gas cylinder rated working pressure need not to improve (≤25MPa), by set up the steel wire circumferential winding layer in its metal inner tube outside, formed steel wire ring twines II type gas cylinder, after the inner bag self-tightening, just can to twine steel cylinder the same with existing glass fibre ring, have close cost, reach identical performance and effect.And the thickness of steel wire winding layer can reduce a lot; Structure can be compacter; Can be more shock-resistant and resistance to wear in the surface; Can also improve significantly the fatigue life of gas cylinder.
3, on all surfaces outside the alloyed steel inner bag, all be wound around high-tensile steel wires (or steel band), formed III type gas cylinder, after the inner bag self-tightening, can improve the rated working pressure value of gas cylinder, more than reaching 35MPa.This newly-designed gas cylinder, can be used for storing various high pressure industrial gas, high-pressure natural gas CNG or high pressure mixing combustion gas HCNG, can improve its efficiency of storage.
4, on all surfaces outside aluminium alloy inner container, all be wound around high-tensile steel wires (or steel band), formed III type gas cylinder, after the inner bag self-tightening, can improve the rated working pressure value of gas cylinder, reach 35MPa.Can be used for storing high pressure hydrogen or high pressure light gas, also can be used for the weight of gas cylinder is had the place of strict restriction.
5, the Young's modulus due to steel wire winding layer and metal inner tube is close, and the described gas cylinder of the utility model patent has the higher pressure fatigue capability of bearing, and can adapt to the environment that inflation, venting change repeatedly, allows gas cylinder that arranged long projected life.
6, identical due to winding process, self-tightening technique and existing II, III type gas cylinder, need not equipment and process is done great transformation, but just output novel product.For trial-production and the batch process of this class new product provides condition.
In addition, the gas cylinder of producing according to the utility model patent system, also have a following additional technical feature:
According to an embodiment of the utility model patent, the intensity of described wire material near carbon fiber, can reach 3500MPa, and cost can greatly reduce far above glass pricker dimension;
According to an embodiment of the utility model patent, the carbon content of described steel wire is not less than 0.7%, can improve intensity by cold-drawn, and diameter is thinner, intensity is higher;
According to an embodiment of the utility model patent, the cross section of described steel wire is rectangle, the square or circular and oblate with fillet;
According to an embodiment of the utility model patent, described gauge of wire or thickness of strips are not more than 0.3 millimeter;
According to an embodiment of the utility model patent, described steel wire (or steel band) need not steel wire is applied very large pretensioning in winding process, belongs to non-prestressed winding.
An embodiment according to the utility model patent, the compressive pre-stress that described metal inner tube is applied in, in the time of should being controlled at the fully loaded work of gas cylinder, the synthetic tangential stress that produces on the dangerouse cross-section of inner bag inwall, the unlikely crackle that causes inner bag to lose efficacy of occurring;
According to an embodiment of the utility model patent, the compressive pre-stress that described metal inner tube is applied in should be controlled at gas cylinder when unloaded, the unlikely flexing instability status that occurs of inner bag.
According to an embodiment of the utility model patent, described steel wire (or steel band) winding layer be parallel organization between layers, outer lamination internal layer; Outermost surface steel wire (or steel band) is provided with and prevents from causing near the lax measure of steel wire (or steel band) after its fracture;
According to an embodiment of the utility model patent, described steel wire adopts the industrialization product of producing in enormous quantities, its reliable performance and stablize, and wire broken rate is very low, also can adopt the lap brazing method that the fracture of wire place is repaired before winding.Can guarantee the stability of gas cylinder winding process, thereby guarantee the quality of gas cylinder.
Description of drawings
The utility model patent above-mentioned/or additional aspect and advantage, from conjunction with following accompanying drawing, in the description to embodiment, will become and obviously and easily understand, wherein:
Fig. 1 has shown the sectional view that has the I type steel gas cylinder integrally-built, that two ends all are provided with safety installations now;
The II type gas cylinder that Fig. 2 has shown that another existing glass fibre ring twines, steel inner container structure, two ends are provided with safety installations
100 "Sectional view;
The III type gas cylinder that Fig. 3 has shown that another existing carbon fiber twines entirely, aluminium alloy inner container, an end are provided with safety installations
100 ' "Sectional view;
The stressed gentle bottle structure sectional view of inner bag that Fig. 4 has shown that the steel wire according to an embodiment of the utility model patent twines entirely, steel inner bag, two ends are provided with the III type gas cylinder 200 of safety installations;
The sectional view that Fig. 5 has shown that the steel wire according to another embodiment of the utility model patent twines entirely, aluminum liner, an end are provided with the III type gas cylinder 300 of safety installations;
Fig. 6 has shown the partial schematic diagram that is wound around in the circumferencial direction annular according to the steel wire of another embodiment's of the utility model patent III type gas cylinder;
Fig. 7 has shown according to the steel wire of another embodiment's of the utility model patent III type gas cylinder at the partial schematic diagram that axially is wound around.
Embodiment
The below describes the embodiment of the utility model patent in detail.Described embodiment's example is shown in the drawings, wherein same or similar label, the element that indicating same or similar element or having identical or similar functions from start to finish.Be exemplary type below by the embodiment who is described with reference to the drawings, only be used for explaining the utility model, and can not be interpreted as restriction of the present utility model.
In the description of the utility model patent, " inboard ", " outside ", " vertically ", " hoop " " on ", the term of the indicating position such as D score, " top ", " end " or position is based on orientation shown in the drawings and position relationship, it is only the utility model patent for convenience of description, rather than require the utility model patent to go structure and operation with specific orientation, therefore, can not be interpreted as restriction to the utility model patent.
In narration below; to be described in detail with the gas cylinder that stores compressed natural gas (CNG); but it will be appreciated that; the gas cylinder of the utility model patent can also be used for storing compression hydrogen, compressed mixed combustion gas and other compression industrial gas; thus; " compressed natural gas " herein be presented for purpose of illustration purpose only, and can not be interpreted as restriction protection domain of the present utility model.The protection domain of gas cylinder described in the utility model should be limited by claims.
The design of the utility model patent is as follows.Proposed a kind of on whole outer surfaces of metal inner tube, increased by the full enhancement layer that is wound around of high-tensile steel wires, (vertically be wound around and hoop is wound around) formed III type gas cylinder.Impose over the hydrostatic pressing self intensification of its yield limit by the inner bag to this gas cylinder and process, make inner bag produce to a certain degree, expendable plastic deformation; After cancelling hydraulic pressure, owing to forming the prestressing force of balance mutually between the residual deformation of inner bag, the inner bag that makes gas cylinder and steel wire floor: during described gas cylinder zero load, that inner bag will bear is that steel wire floor applies, have certain pre-value, circumferential compressive force and axial compression stress; Steel wire floor bears the pre-tensile stress of certain numerical value; When the gas cylinder full load, the tangential stress of inner bag inwall is the superposition value of work tensile stress and compressive pre-stress, should guarantee it still in the allowable stress range of liner material, therefore can not lose efficacy; Full load although the tensile stress of steel wire floor is also increasing, still in the scope of the resiliently deformable that steel wire allows, therefore can not lose efficacy yet yet; Thereby guaranteed that this gas cylinder can than steel I type gas cylinder and the II shaped steel bottle of glass fibre ring entanglement structure, the working pressure of bearing higher numerical value, enlarge the accommodation of gas cylinder, and improve the fatigue life of gas cylinder.Also can lower cost be arranged than the III type gas cylinder of the full entanglement structure of carbon fiber, the gas cylinder that (but having the deadweight of larger winding layer) reaches 35MPa for pressure store provides a kind of innovative product of low price practicality.
An embodiment's of the utility model gas cylinder 200 is described below with reference to accompanying drawings, and wherein Fig. 4 has shown that steel wire according to an embodiment of the present utility model twines entirely, the stressed and structure sectional view of the III type gas cylinder 200 of steel inner-tube structure; Fig. 5 has shown that the steel wire according to another embodiment of the present utility model twines entirely, the sectional view of the III type gas cylinder 300 of aluminum liner structure; Fig. 6 has shown the hoop steel wire winding layer partial schematic diagram according to another embodiment's of the utility model patent III type gas cylinder; Fig. 7 has shown the longitudinal steel wire winding layer partial schematic diagram according to another embodiment's of the present utility model III type gas cylinder.
According to an embodiment of the utility model patent, as shown in Figure 4, described gas cylinder 200 comprises: steel inner container 201; And steel wire (or steel band) winding layer 202, described gas cylinder winding layer 202 adopts high-tensile steel wires (or steel band), its carbon content greater than 0.7%, diameter is not more than 0.3 millimeter, intensity and is not less than 3500MPa; Described high-tensile steel wires or steel band 202, sub-thread or multiply are wrapped on whole outer surfaces of described metal inner tube 201 continuously, form multi-lamellar parallel organization; Described gas cylinder will impose over the hydrostatic pressing self intensification of its yield limit metal inner tube 201 and process before dispatching from the factory, and winding layer and inner bag is fitted tightly, and make metal inner tube 201 produce to a certain degree, expendable plastic deformation; After cancelling hydraulic pressure, just formed the prestressing force of balance mutually between the inner bag 201 of gas cylinder and steel wire floor 202: inner bag 201 produces the pressure stress of predetermined value, and steel wire floor 202 produces the tensile stress of predetermined value.The predetermined value of the predetermined value of described inner bag pressure stress and described steel wire floor tensile stress, all can guarantee gas cylinder when fully loaded work, inner bag and steel wire floor can not lose efficacy, thereby guarantee that gas cylinder bears higher pressure store value.
The three-dimensional stress of inner bag 201 has been shown in Fig. 4, and according to computational methods, (for example Mises stress) can be obtained by three following principal stresses:
Wherein σ 1, σ 2, σ 3 are respectively three-dimensional principal stress: σ 1 and are axial tension stress for circumference tangential stress, σ 2 for circumference radial compressive stress, σ 3.As long as this calculated stress value of full load, steel inner bag 201 is not more than the allowable stress value of material, inner bag just can not lose efficacy; Same, as long as the suffered tensile stress value of described steel wire floor 202 full loads is not more than the allowable tensile stress value of High Tensile Steel Wire, steel wire floor just can not lose efficacy yet.
Various process parameters in the time of also will calculating the self intensification processing, as self intensification hydraulic pressure value (yield limit that should surpass material), dwell time, cancel the residual deformation of inner bag after hydraulic pressure, the pre-tensile stress that steel wire floor causes thus, the compressive pre-stress of inner bag, and will be optimized self intensification hydraulic pressure numerical value.Also to adjust gas cylinder when unloaded, guarantee the condition that inner bag can the flexing unstability.Etc..
In a word, by the mechanics analysis and calculation to cylinder liner and steel wire winding layer, be to determine the thickness of steel wire floor and inner bag thickness; Can also determine the compressive pre-stress value of hydraulic pressure numerical value and the setting inner bag of inner bag self intensification; This just for design and the pressure store of anticipation gas cylinder and according to working pressure go to design gas cylinder size, the foundation of science is provided.
An embodiment according to the utility model patent, the elasticity modulus of materials value of described inner bag 201 and described steel wire winding layer 202 and the swollen coefficient value of hot line equate, can guarantee the distortion coherence and continuity of metal inner tube and steel wire winding layer, guarantee that inner bag and steel wire floor fit tightly all the time, reduce the stress decay of winding layer, thereby can improve the fatigue life of gas cylinder.
On the outer surface of the steel wire winding layer 202 of described gas cylinder 200, can be wound around the layer of steel wire bundle, in order to protect inner effective steel wire winding layer more.Also can be wound around one deck glass pricker dimension, implement protection.
The intensity of steel wire of described gas cylinder is high, cost is lower, stable performance.System is by the product of industrialization, the preparation of production in enormous quantities condition.Steel wire is made over 0.7% carbon steel by carbon content, and ultimate strength is greater than 3500MPa, and cross section is rectangle, the square or circular and oblate with fillet, and steel wire diameter is not more than 0.3 millimeter.The gas cylinder that strengthens thus can bear high pressure (reaching 35MPa, even higher), can have low cost again; Can also possess stability.
According to another embodiment of the utility model patent, as shown in Figure 5, described gas cylinder 300 comprises: aluminium alloy inner container 301; And the steel wire winding layer 302 that formed by sub-thread or Steel Wire Strand (or steel band) continuous winding of all surfaces of inner bag outside; Entirely twine III type Aluminum Bottle referred to as steel wire.Because described inner bag 301 is alloy aluminum, after the hydraulic pressure self-tightening, can produce tangential and axial compressive pre-stress, improved the stress of its full load, this gas cylinder can bear higher pressure store, and very light in weight, relatively is fit to be applied to weight reduction is had the occasion of requirement; And because inner bag is not afraid of the hydrogen corrosion, be more suitable in the gas cylinder that is applied to store compression hydrogen.
Described steel wire winding gas cylinder and carbon fiber twine Aluminum Bottle full when comparing, and can show described steel wire winding layer deadweight larger, can increase the gross weight of gas cylinder.(as long as the weight of described gas cylinder is no more than the threshold limit value of vehicle specifies---be no more than 5% of passenger vehicle deadweight, remain allow to use) but greatly reduce manufacture cost.
The following describes the method that forms described steel wire winding layer.Must carry out the work of reorganizing and outfit before being wound around: first with satisfactory Steel Tendon in the mode of multiply arrangement, go forward one by one by helix, hoop is wound on cylinder continuously; During coiling, as finding that steel wire has fracture of wire or broken end, the method for available lap brazing is repaired; The cylinder of reorganizing and outfit is only the storage silo of winding steel wire layer, could be successfully, continuously, with the Steel Wire Strand bundle, inner bag is carried out continuous winding; Because the Steel Wire Strand bundle has certain rigidity, must apply certain tension force during winding, tighten Steel Tendon, could normally carry out; In order to form silk and silk, between layers parallel organization, adopts epoxy resin impregnated method, with layer and layer, thread and thread between steel wire bonding and keep apart, final curing formalizes.Also can adopt the method for other binders dipping to realize the parallel organization of steel wire winding layer.But do not allow boring on cylinder liner, hitch and with the mode of welding with the processing method on the outer surface of fixation with steel wire at inner bag, because it can affect the mechanical property of inner bag.
Fig. 6 has shown another embodiment according to the utility model patent, the steel wire circumferential winding layer partial schematic diagram of III type gas cylinder.Described ring like steel wire winding layer is the part of whole winding layer, after its role is to inner bag self intensification processing, can apply enough compressive pre-stresses to the tangent to periphery direction of inner bag, in order to improve inner bag in the stress of tangent direction.If the outside at cylinder liner only is provided with the ring like steel wire winding layer, this gas cylinder is exactly II type gas cylinder.Can be used for the occasion that pressure store is not more than 25MPa.Equal and the existing glass pricker dimension of its performance, cost and technique II type gas cylinder is suitable, but can surpass glass pricker dimension winding gas cylinder its fatigue life.
Fig. 7 has shown the vertical winding layer partial schematic diagram of steel wire according to one of the utility model patent and another embodiment's III type gas cylinder.Described vertical winding layer is the part of whole winding layer, after its role is to inner bag self intensification processing, can apply to the axial direction of inner bag enough compressive pre-stresses, in order to improve inner bag in the stress of axial direction.The setting of described longitudinal steel wire winding layer is very necessary: if there is no vertical winding layer, just can not form III type gas cylinder; Only having to have formed III type gas cylinder, could according to the regulation of related standards, exempt " the inner bag hydraulic bursting test " that must carry out II type gas cylinder---inner bag must be by the hydraulic bursting test of 1.3 times of working pressures.Therefore, under identical inner bag size condition, the III type gas cylinder of full winding structure can bear larger pressure store than isometric II type gas cylinder.Must take full advantage of this relief condition on standard, design and bear the higher gas cylinder of pressure.
The utility model patent is an innovation that can promote gas cylinder design, Manufacturing Technology Development, can be than the gas cylinder of existing glass fiber winding and carbon fiber winding structure, show larger technical advantage: by being wound around the identical or close high-tensile steel wires of Young's modulus numerical value at the metal inner tube outer surface, more reasonable technically, more feasible on engineering.This be because: the elastic mould value of glass fibre and carbon fiber and metal inner tube differs larger, caused inner bag excessive with respect to the rigidity of winding layer, can't consist of desirable prestressing force tube structure, can only realize the limited improvement to gas cylinder, outstanding performance is exactly: the fatigue life of glass pricker dimension winding gas cylinder and carbon fiber winding gas cylinder is very low, (be about hundreds of thousands the fatigue life of the mechanical component of steel wire winding structure and arrive millions of times, and only have several ten thousand the fatigue life of the gas cylinder of Filament-wound Machine.Both have differed more than one or two order of magnitude) the prestressing force attenuation phenomenon of winding layer is more remarkable, must be improved.The effect of this prediction will go to confirm in the hydraulic pressure fatigue test in this trial production of new products type-approval process.This is also a kind of necessity, the reliable method of inspection of this innovative hypothesis.The target of this model utility is to make the life value of its hydraulic pressure fatigue test reach the peak of present standard---4.5 ten thousand times.And analyze theoretically, this target can realize.
The advantage that the utility model patent shows also is: for the gas cylinder of glass fiber winding, the steel wire winding gas cylinder can bear the above pressure store to 35MPa of 25MPa, and glass pricker dimension winding gas cylinder is difficult to reach 35MPa; To the gas cylinder below 25MPa, both manufacturing process are close, and manufacture cost is identical, and are identical with the Base weight of two kinds of gas cylinders of capacity; (inner bag weight is identical; The weight of winding layer is suitable) fatigue life, there is a big difference.With respect to carbon fiber produce around structure for, the sharpest edges of steel wire winding gas cylinder are greatly to reduce manufacture cost, for the industrialization of ultrahigh pressure gas cylinder with enlarge and use that provide may.Its shortcoming is: the steel wire winding layer increases more weight than carbon fiber winding layer, (may reach 3～4 times more than) still, the shared weight of steel wire winding layer of gas cylinder is only 20～40% of gas cylinder weight, and institute's gain in weight is relatively less, but can bring up to 35MPa to pressure store.Greatly improve the lasting distance travelled of Natural gas vehicles, promoted the whole efficiency of CNG industry, the innovative product of a kind of practicality of can yet be regarded as;
The steel wire winding gas cylinder is wanted and can finally successfully be applied among the compressed natural gas industry, and test requirements document and the design code that also must stipulate by related standards could be by the evaluations of product protection.Wherein most important is exactly these three indexs of hydraulic bursting test, hydraulic pressure fatigue test and design safety factor.
According to relevant criterion, hydraulic bursting test requires: the hydraulic pressure demolition pressure of the gas cylinder that is tested and appraised is greater than 2.5 times of working pressure; The tired pressure test of hydraulic pressure requires: the hydraulic test pressure of the gas cylinder that is tested and appraised equals 1.5 times of working pressure, life-span of the hydrostatic test should surpass the hour number of correlation standard; The allowable stress value that design safety factor should meet the specified value liner material of related standards must not should be 1.6～1.8 times of Steel Tendon allowable stress greater than 950MPa, Steel Tendon intensity.
In the description of this specification, some describe reference term " embodiment " " another embodiment " " example " etc., mean to be included among at least one embodiment of the present invention in conjunction with specific features, structure, material or characteristics that this embodiment describes.In this manual, the schematic statement of above-mentioned term not necessarily refers to identical embodiment or example.And described specific features, structure, material or characteristics can combinations in any one or more embodiments.
Although illustrated and described embodiment, those having ordinary skill in the art will appreciate that: in the situation that do not break away from the utility model patent principle and aim, can carry out multiple variation, modification, replacement and modification to these embodiments, scope of the present invention is limited by claim and equivalent thereof.
Claims (5)
1. the gas cylinder of a steel wire winding structure, comprise metal inner tube and be wound around reinforced layer, it is characterized in that, be wound around continuously by the steel wire with pre-tensile stress or steel band sub-thread or multiply at the outer surface of the metal inner tube with compressive pre-stress, be formed with multi-lamellar winding reinforced layer, be wound around the outer surface that reinforced layer closely covers described gas cylinder metal inner tube; The cross section of described steel wire or steel band is oblateness, the square with fillet, rectangle, trapezoidal or circular; The thickness of described gauge of wire or steel band is not more than 0.3 millimeter; The intensity of described steel wire or steel band is not less than 3500MPa.
2. the gas cylinder of steel wire winding structure according to claim 1, is characterized in that, between the tow and tow of the winding reinforced layer that described steel wire or steel band form, between layers, with the binder dipping, skin is pressing internal layer, is parallel organization.
3. the gas cylinder of steel wire winding structure according to claim 2, the material that it is characterized in that described steel wire or steel band is that carbon content surpasses 0.7% high carbon steel or high-carbon low-alloy steel.
4. the gas cylinder of steel wire winding structure according to claim 3, is characterized in that, the material of metal inner tube is low-alloy structural steel or aluminum alloy.
5. the gas cylinder of steel wire winding structure according to claim 3, is characterized in that, described winding reinforced layer comprises circumference circumferential winding layer and axial winding layer.
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| CN 201320153676 CN203273275U (en) | 2013-04-01 | 2013-04-01 | Steel wire winding structure high-pressure gas cylinder |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105465597A (en) * | 2014-08-12 | 2016-04-06 | 上海空间推进研究所 | 100 L carbon fiber wrapped aluminum-lined composite cylinder and manufacture method thereof |
| CN110173619A (en) * | 2019-06-13 | 2019-08-27 | 杨清萍 | A kind of aluminium, steel composite layer hydrogen container and its fiber winding enhancing hydrogen storage bottle for core |
| CN110345374A (en) * | 2018-04-06 | 2019-10-18 | 丰田自动车株式会社 | Pressure pan |
-
2013
- 2013-04-01 CN CN 201320153676 patent/CN203273275U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105465597A (en) * | 2014-08-12 | 2016-04-06 | 上海空间推进研究所 | 100 L carbon fiber wrapped aluminum-lined composite cylinder and manufacture method thereof |
| CN110345374A (en) * | 2018-04-06 | 2019-10-18 | 丰田自动车株式会社 | Pressure pan |
| CN110173619A (en) * | 2019-06-13 | 2019-08-27 | 杨清萍 | A kind of aluminium, steel composite layer hydrogen container and its fiber winding enhancing hydrogen storage bottle for core |
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