CN107160657A - Method for producing a fuel tank provided with internal accessories - Google Patents

Abstract

Method for producing a fuel tank provided with internal accessories and having a tank wall made of plastic, made in a single piece by moulding a split parison or at least a two-part parison, said method comprising the following steps: a) introducing the parison in a heat-softened state into a mould comprising a plurality of dies; b) introducing a core on which the accessories are positioned inside the parison; c) pressing the parison against a die of the mold; d) fastening the accessories to the parison in an ideal layout with the aid of the core; e) removing the core and closing the mould; f) moulding the tank from the parison; and g) removing the tank from the mould.

Description

Method for producing the fuel tank for being provided with contents

The application is divisional application, and (international application no is PCT/ to the Application No. 200680023367.9 of its parent application EP2006/063590), the applying date is on June 27th, 2006, entitled " to be used to produce the fuel for being provided with contents The method of case ".

Technical field

The present invention relates to a kind of method for producing fuel tank, the fuel tank (at least in part) is provided with multiple inside Annex and particularly one make the inside and outside part being in fluid communication of the casing (fuel tank, tank).

Background technology

Onboard fuel system on different type vehicle generally includes some devices, and these devices are to be contained in casing Hydrocarbon (hydrocarbon) provides ventilation.They can also include the device that fuel is provided for engine.Such device is being contained in The part (valve, petrolift etc.) of box house and part (canister, filling tube (charge pipe, filling outside Pipe connection is formed between) etc.).Current environmental standards (such as LEV must account for by the manufacture of the passage of the box body wall II, PZEV) as defined in prevent leakage requirement.Steamed therefore, the quantity and size that reduce the opening on the box body wall constitute to reduce Send out a favorable factor of loss.However, this make it that insertion and placing component become more difficult in casing.

In addition, casing is commonly equipped with circulation loop (circuit) (such as divulging information, fuel supply), including positioned at Box house and, it is the conduit (pipeline, pipe) of the part being connected to outside casing, valve, small-sized according to possible situation Pipe etc..Now, when box house is with the outside formation fluid communication by tank wall, it is possible to according to the position of tank wall upper shed (such as in a flat position), forms siphon in the duct.In the case of ventilation circuits, they constitute a shortcoming, because The accumulation of liquid to be transmitted by steam can cause the failure of the ventilating system.In addition, in the case of fuel supply lines, It is possible to detour (roundabout, detour) or one section of unnecessary length that the flat position is related to the conduit.

Finally, casing generally includes other annexes, such as one or more anti-fluctuation (and related antinoise) Baffle plate, a device for liquid will be made to be separated with steam, one or more meters for being used to measure fuel level, one Reserve tank (reserve tank) etc..The purpose of the latter is to prevent when motor vehicle fuel is exhausted or it is parked in slope position During overlong time, pump can not inject.It is usually provided with a valve (" the first injection valve ") so that when casing feeds for the first time And/or after running out of gas, material feeding is made it possible to, and its size is generally limited by put it into casing And the size in the hole made on casing.

All these contents (more precisely at least part contents) are generally all after the completion of casing molding Place/be attached to inside it by operation respectively, this operation respectively expends time and labour and is therefore expensive 's.In addition, as mentioned before, it is contemplated that to be reduced to introduce the size and quantity of the perforate (orifice) of the annex tank wall, Often attempt to gather together them, therefore, their position is not that optimal (performance of the annex is not in other words It is optimised).

Application EP 1110697 on behalf of the applicant discloses a kind of method for moulded fuel case, and this method exists Parison has been used so as to which these annexes are inserted into it while casing is molded in several parts (part, part) In.In view of to reduce number of components that is to be introduced and being fastened to box house, the document recommends pre-assembled structures, this The problem of solving open amount and molding cycle (moulding cyclc) entirety duration, but can not thoroughly solve different attached The problem of part position optimization.Therefore, it is an object of the invention to provide a kind of method that can solve the problem that the problem, and this is to borrow Help using an independent support member (being referred to as one " chipware ") thereon these annexes be placed on one preferably be laid out In and it make it possible to that the annex is anchored on their ideal positions in casing in a single step.Tool Say, in a change case, the method according to the invention makes it possible to a kind of fuel tank being made of plastics of production body, it With fluid communication between the inside and outside of said, this is the opening by a reduction size, and its position can Therefore detouring for siphon and/or pipeline can be prevented with unrestricted choice, and this is by being related to the one of minimal steps number Kind of method is realized.

The content of the invention

Therefore, being used to produce what is be provided with multiple contents and be made of plastics with one the present invention relates to a kind of The method of the fuel tank of tank wall, the fuel tank is by moulding a parison rived or including at least two parts (part) parison And a single piece (integral piece, single piece) is made, it the described method comprises the following steps：

A) parison is incorporated among a mould including multiple pressing molds (die) in the state of thermal softening；

B) chipware that placed these annexes thereon is incorporated into inside the parison；

C) parison is pressed onto on these pressing molds of the mould；

D) preferably it is laid out with one by means of the chipware and these annexes is fastened on the parison；

E) remove and (recall, withdraw, withdraw) chipware and close the mould；

F) casing is moulded with the parison；And

G) casing is removed from mould.

In the background of the invention, " annex " be understood to mean a part or multiple parts assembly (assembling, Assembly), it has an active sexual function (active function) for example for divulging information in casing, for conveying Fuel is to engine, for measuring liquid level (liquid level, liquid level), noise related to fluctuating etc. for reducing. Especially, it includes assembly of a part or multiple parts, its function can according to it or they position by Optimization.Especially, it may include a draft tube liner and/or a fuel or supply of electric power pipeline, and its exit point position is therefore Can be with unrestricted choice (to prevent from being formed siphon and/or for optimizing the length of the pipeline and/or for increasing having for casing Imitate volume (swept volume, working volume)).Similarly, it can include the baffle plate of one or more anti-spilling, its Acoustical behavior depends specifically on the position of one or more fuel gauge, and the measurement accuracy of the meter is also depended on The position.The present invention is particularly well applicable for setting up the part of fluid communication between box house and outside, for example above Described ventilation and fuel supply lines, because according to one change case, it can also obtain the stream not leaked completely Body is connected.

According to this change case, in step b), introduce and led including one for fluid passage inside the parison At least a portion of pipe and/or the part of a perforate；Also, in step d), the element portion is secured on parison, root Method according to this change case of the invention additionally includes a step, is manufactured during the step on the tank wall of casing One opening, this aperture position is limited in the element portion and is fastened on the position of the parison so that by the opening or Thus conduit discharges and allows the fluid communication between box house and outside.

Fuel tank is understood to mean under conditions of use and under various and different environmental condition and can stored The anti-leak casing of fuel.One example of this casing is mounted in the casing on motor vehicles.

It is made up according to the fuel tank of the present invention of plastic wall, an inner surface being commonly included on its recessed portion is (interior Face, inner face) with an outer surface (outside) on its projection.

Plastics refer to include any material of at least one polymer being made up of synthetic resin.

All types of plastics are all suitable.Specially suitable plastics belong to the classification of thermoplastic.

Thermoplastic refers to any thermoplastic polymer, including thermoplastic elastomer (TPE) and their mixture.Term " polymer " refers to homopolymer and copolymer (particularly binary or ternary).The example of such copolymer is, in one kind In the sense that non-limiting：With a kind of copolymer of random distribution, sequential arrangement copolymer (alternate copolymer, Sequenced copolymer), block copolymer and graft copolymer.

Its fusing point is all suitable less than any kind of thermoplastic polymer or copolymer of decomposition temperature.Melt model Enclose (melting range) and be enlarged beyond at least 10 degrees Celsius of synthetic thermoplastic material and be particularly suitable.It is used as one of such material Example, is the material that those its molecular weight have polydispersity.

Especially, it is possible to use polyolefin, thermoplastic polyester, polyketone, polyamide and their copolymer.It can also make With polymer or the mixture of copolymer, and polymeric material and inorganic, organic and/or natural stuffing mixture, for example, In a kind of non-limiting sense：Carbon, salt and other inorganic derivatives, natural or polymer fiber.It is also possible to using by At least one of the sandwich construction of the tack coat composition of stacking, including polymer described above or copolymer.

Through frequently with a kind of polymer be polyethylene.High density polyethylene (HDPE) (HDPE) has been achieved for excellent result.

Preferably, a kind of sandwich construction is included according to the inventive method casing to be produced, the sandwich construction is included extremely Few one layer of thermoplastic and at least one extra play, it is advantageous to which the extra play can be including being to liquid and/or gas A kind of material of one separation layer.

Preferably, the characteristic of the separation layer (barrier layer) is selected as farthest limiting and case with thickness The permeability for the liquids and gases that the tank wall of body is in contact.Preferably, the layer is to be based on a kind of isolated material, i.e., a kind of to fuel Impervious resin, such as EVOH (vinyl-vinyl acetate copolymer of partial hydrolysis).Alternatively, the casing can be carried out Surface treatment (fluorination treatment or sulfonation processing), it is therefore intended that make it impermeable to fuel.

Parison, it is thus understood that refer to a kind of prefabrication (preform, preform), is normally squeezed and presses and for arbitrary shape Shape, generally essentially flat or tubulose, its purport is used for the tank wall for constituting casing after the moulding, in other words in time processing After (operation, operation), the processing is included in required by the parison given with the help of mould under thermal softening state Shape and size, to obtain entirety (one piece) casing.

The method according to the invention employs a chipware.This is understood to refer to a suitable dimension and the part of form So as to be inserted between the cavity of the mould.For example in patent GB Isosorbide-5-Nitraes 10,215 such part is described, by it Hold and be introduced in as reference in the application.In the context of the present invention, the major function of the chipware is to dispose these annexes And it is fastened on parison.When the accessories are fastened by welding, the chipware is settable heater block (such as speculum (mirror)), the heater block keeps accessories section to be welded to be that hot (in addition to the chipware, the part typically for example passes through Infrared heating is pre-heated)., can be in the region that will be contacted with parison during these annexes (seeing below text) are disposed Or heater block (such as heater strip (filament)) is provided in multiple regions.

It should be noted that being fastened by welding under the background of a part, preheat these parts and be not intended to be forcibly in core Carried out on part.For example speculum (or other preheating tools) can be placed on the framework of machine without being formed as chipware A part.On the other hand, the speculum (or other preheating tools) needs to be placed on suitable position in the suitable time So as to preheat the part.

The chipware can be also used for blowing air under stress in the mould so that the parison is pressed onto into the mould On pressing mold.It helps to mould the casing by this way, or even there is provided parison deformation before these annexes are by fastening Major part (usually obtain 80% of the deformation required by the casing, even 90% and even 95% rank.)

Therefore, there is the chipware at least one perforate the chipware inner space is connected into a triple valve, it is on the one hand An external source of air under pressure is connected to, and on the other hand, is directly connected to air.(blown in first time blow molding Modeling, blow moulding) during, air accumulator is connected to chipware by the controlled triple valve, in this way in chipware and mould Middle release gas (air, air).At the end of the first time blow molding, before opening the mould, the chipware must and air Connection, this is realized by controlling triple valve, and now the gas volume of chipware is in communication with the outside.One alternate design is Two perforates are formed on the chipware, with 2 controlled port valves of two difference, one is connected to the air accumulator and another is connected to Air.

Air is calculated as a given stream by a single perforate (ideally with one two inches of diameter) Amount is injected into the chipware, or is injected into by a hole for being provided with a blow moulding nozzle in the chipware.Then should Nozzle makes air injection directional, and prevents air-flow by this way to a heater block or be mounted in casing Any impact of an interior part.

The loop of pre- blow molding (or for blow molding in the chipware) is described above to be totally independent of Ensure the expansion circuit of the second blow molding.

Finally, the chipware may be utilized for controlling this method at least in part.Therefore, such as one video camera can be filled Enter in the chipware for use in be controlled and (shown, visualize) by graphical analysis and monitor annex connection quality. One or more sensor for being used for the numerical value for measuring power, stroke, pressure and temperature can also be installed to the chipware More effectively to monitor the connection of annex.

In the method according to the invention, these contents are fastened by means of the chipware according to a kind of preferably layout Onto parison.This is understood to refer at least some of which and has a location such that their performance is optimised.Preferably, it is this Layout causes the global optimization performance of the casing and/or its working internal volume.In order that chipware carries out this positioning, favorably Be that these annexes are pre-positioned in the phase of pressing mold before the pressing mold for carrying the parison surrounds the chipware for carrying these annexes Answer on position.In other words, they are pre-positioned on the chipware so that when the mould is closed, they are all leaned on as much as possible Corresponding ideal position closely on pressing mold.

Advantageously one or more eyelid retractors (jack, jack) may also be provided for the chipware causes part to pass through weldering Connect or rivet and firmly fastened.

In the method according to the invention, the casing has two-part parison quilt by a parison rived or at least Being molded as a single piece, (casing obtained after an one step is a single piece, it is not necessary to other assemblings point The complementarity step of other shell), and this is typically to pass through weld separation or two-part parison when mould is closed. Particularly advantageously, the casing is moulded by following steps：

● blow molding, that is to say, that by a pressure fluid that the tubular parison including at least one cut-out is swollen It is swollen and be expressed on the wall of a mould (as application EP 1110697 described in, its content is hereby incorporated by reference In the application)；

● thermoforming sheet material, that is to say, that by pressing them against on the wall of a mould, such as by behind them Create swabbing action (formation vacuum).

In the method according to the invention, (that is it deforms substantially to obtain case the so-called formation parison The shape of body) occur mainly in step c) during.Simply tieed up during step f) (wherein carrying out above-mentioned welding) Pressure (or suction force) is held to ensure the dimensional stability of casing.

In the case of a blow moulded tank, after a single tubular parison is extruded, the latter's (tubular parison) is at it Cut in whole or in part in length, preferably along two diametrically opposite lines.

Compared with respectively two extrusion plates of blow molding, and it is constant, this processing side on thickness Method makes it possible to the parison (that is non-constant in length) using variable thickness, and this is filled by a suitable extruding Put and obtain (a usual extruder is provided with a pressing mold, the pressing mold carry the adjustable drift in position (plunger)).This parison considers occur after blow molding process in which materials in a mold irregular deformation extent The some positions of parison on thickness reduction.

Preferably, the casing is moulded by blow molding.In fact, thermoforming is usually directed to is heated to 60C by mould So as to which deep deformations (such as in casing corner parison by high elongation) can be realized.The result is that cycle time is than air blowing mould System is longer, and this constraint is for blow molding and is not present.

Therefore, the pressing mold of the mould is generally closed at the chipware during step c) and step d), in other words They contact therewith and limit a sealing area in the chipware either side.Or more precisely：Because these pressing molds The parison is carried, the chipware is in contact with the parison, therefore the parison is clamped between chipware and the pressing mold of mould.This connects Tactile region is preferably placed at outside welding region.It is excellent if include/being exactly the welding region of the parison with the contact area of chipware It is selected in the contact area and heats chipware to ensure welding.Then its first time closing as the mould to a certain extent, The chipware is inserted therebetween and contacted with pressing mold, and is blown into by specifically closing gas-pressurized (generally air).Generally, This region is located at the periphery of pressing mold and also often also in the periphery of the chipware.This of the mould is sealed for the first time Close composition so-called " pre- blow molding " (or first time blow molding).

The gas pressure is preferably greater than or equal to 1 bar, preferably 2 bars in pre-b low-moulding step, or even 3 bars. However, it is typically less than or equal to 6 bars, preferably 5 bars.

After the second closure of the mould, the gas pressure for blow molding is general higher, is typically greater than 6 bars, Preferably 7 bars.Advantageously however, it is no more than 10 bars.

In each step of blow molding, gas pressure advantageously with behind the pressing mold of mould (or outside part) A pressure reduction (applying vacuum) be combined.The rank of preferably hundred millibars of this pressure reduction (is typically arrived 100 Between 500 millibars, preferably between 200 to 400 millibars).

In the molding process by blow molding, the method according to the invention also includes de-airing step, this be It is each open mould before perform, that is to say, that before in step e) and g).

The de-airing step can be realized in a suitable mode.Generally, the parison is pierced (for example uses acupuncture first It is broken) then fluid released from the mould (such as by means of valve).In the case where casing is moulded by thermoforming, the mould Need not be closed on chipware so that the latter is pressed onto on pressing mold (because compacting be realized by being aspirated under the latter rather than By chipware come blow molding).

In this change case of the present invention (wherein casing by least part by blow molding that the chipware is realized and mould System), to being molded with profit by means of the pre- air blowing of the chipware, the size that the parison has substantially had casing (or is changed Sentence is talked about, the deformation of the parison be substantially occur in the step and not in second of mould closing).

During the method according to the invention, preferably (when the parison quilt in the first time closed process of the mould It is pressed on pressing mold so that these annexes are fastened on parison) gap or the edge quilt that there is a device to prevent the parison each several part It is welded together.This device is advantageously incorporated in the chipware.Therefore, the chipware preferably has suitable a shape and size There are (antelabium in gap or two to be welded to be partly inserted into the parison (typically at least including its peripheral part) The edge of part) part between.In order to contribute to the welding in step f), the pressing mold of the mould is advantageously provided with a heat tune Engagement positions, the device make it that welding region is by appropriate heating during the mould for the first time correlation step of closing.

As it was noted above, the chipware may also include such a device in its contact zone or zones with the parison (being used for heat adjustment), and this is particularly in the case of including previously described welding region.This change case can more be entered One step improves the welding quality of casing (by reducing the internal bead and the therefore impact resistance of raising casing).It is such a Device is described in for example that in the nominal application FR 04.13407 of the applicant, its content is hereby incorporated by reference into this Shen Please in.

According to the first preferred variant, these annexes being secured to by means of the chipware on parison include a deposit Case, failure is entered for preventing for example in short bunker or stopping the infusion caused on slope for a long time.By means of the side of the present invention Method makes it possible to not select pass freely only the volume of this casing (therefore can be by selecting a large-size to expire for it The specification requirement of all car manufactures of foot), and the position of the latter can also be optimized make it possible to be directly connected to filling tube and (appoint Gated a leakproof flexible connector (be made up and/or be made of rubber and be corrugated)), avoid seeking help from as mentioned before with this One " the first injection valve ".In this change case, the check valve (ICV) for being typically found in the material feeding bottom of the tube can be advantageously Be incorporated in flexible connector mentioned above, and this be for ease of assembling the reason for.

According to the present invention this change case casing can by any appropriate ways (welding, it is over-molded (overmoulding), blind rivet riveting (pop-riveting)) it is secured on parison.Blind rivet riveting technology is particularly suitable for.

According to another already previously mentioned preferred variant, at least one annex includes being provided with for fluid passage A conduit or opening part.The part referred in this change case of the present invention refers to allow fluid (steam And/or liquid) object circulating between the inside and outside.It can include ductule, a valve Etc..It advantageously comprises at least a portion of the fuel supply lines of draft tube liner or casing.

The object preferably includes a pedestal (base), usually a flat form, and at least one molded component (profiled part) or conduit.The pedestal generally has a circular periphery and the conduit generally has a base The shape of cylinder in sheet.In a preferred mode, when the part is secured on the tank wall of the casing, this conduit is extremely Small part is located at outside casing.For example this is in the case where the part is used to connect a ventilation circuit, and it can proceed to one The connection of individual canister.The part be used for be connected to the fuel supply lines of engine in the case of, it can also proceed to The connection of the engine.It should be noted that the part can include second conduit, for ventilation of the inside connection from pump Pipeline or burning line.In this case, it is advantageously that, the internal pipeline is just connected before tank wall is secured to To the part, and the exterior tubing is completed in molding and is preferably just connected after casing shaping (cooling).

By setting up the fluid communication between the box house and outside, the part usually becomes the multiple members communicated with each other One network of the assembly of part.

The part can with appropriate mechanical strength with chemicals (fuel) corrosion resistant any material is made.It is excellent Choosing is made up of metal or plastics.Plastics because its lightness and be easy to apply and it is preferred that.Various forms of plastics may all be fitted Close.Preferably, a kind of plastics are selected, it has preferable dimensionally stable in a medium subjected to temperature variations of the order of several tens of degrees celsius Property.A kind of plastics are further preferably selected, its dimensional stability is not by the liquid being in contact with it and gas being for example contained in casing Influence, and be impervious.Polyacetals, polyamide, polyester and polyvinyl halides (polyvinyl halide) are given Good effect is gone out.The plastics being well suited for are polyacetals and particularly POM (or polyformaldehyde).At one particularly preferably Mode in, the part is made of injected plastic, and is formed in other words in a mould by the injection molding technology under pressure.

The part can be made based on the material to fuel with hypotonicity or by polyethylene.Preferably, when the portion When part is based on polyethylene, it is processed for reduce its permeability.The processing include for example to the sulfonation of part processing or Person's fluorination treatment.

According to this change case of the present invention, at least a portion of the parison part is that the mistake of casing is being produced by moulding On being connected in journey, in other words before the step e) of mold close.

A part for the part is fixed on parison by any appropriate mode.Generally, it is including the use of a branch Support member.Support member is understood to mean that can be secured temporarily to a movable part for the element portion, so that it can be with It is introduced into the parison and there (being fastened on its internal tank wall) can be connected to.Conventional blow moulding methods often make With a blow moulding blowpipe, it, which designed to be used, is blown into pressure fluid inside the parison of the mould.This blowpipe can be with Serve as a support member.Alternatively, a mechanical arm may be used as a support member.This solution is moulded in thermoforming In the case of it is quite suitable.Finally, if having used chipware in method of moulding, the latter can play a part of a support member.

Due to the removable dynamic characteristic of the support member (chipware), the part is positioned in inside parison, once when the part reaches During to correct position, the part is to be secured on parison (onto a part for its inner surface).Any those skilled in the art Known tightening technology can be applied in the background of the present invention.Blind rivet riveting for example can be passed through under the auxiliary of the chipware Connect or the part is fastened on parison by the mode of welding material on the contact area of part and parison.It is also possible at this Over-molded (overmould) is carried out at least partly part under the auxiliary of parison and/or the part is welded to the parison Above (in the case of compatible materials).

Once after the part has been secured on parison, where appropriate, the support member is withdrawn from from mould, and then should Mould is closed to produce the casing on parison.

One step is additionally included according to the method for this change case of the invention, in the case of casing during the step An opening is made on wall and this can form a part for the method for moulding or as its further part.When moulding When the opening being made in journey, it is preferably when parison is under pressure with the needle-penetration parison.In this case, the movement of the pin Be easy to be formed the burr (spur) and this burr of material in the periphery of the opening advantageously will be gone after casing molding Remove.

Therefore, in a preferred mode, the opening is remanufactured after casing is molded into, for example should by excision The part on the tank wall surface of casing.

According to this change case of the present invention, the part may include the part of one or more assemblings.

According to first change case, the part includes a single piece, and it includes a conduit and this part quilt Fasten to cause it to pass through the opening of the tank wall of the casing.The shortcoming of this change case is to be secured to the parison in the part On so that before causing the conduit by the tank wall, the opening on the tank wall of the casing must be manufactured in molded housing.It is existing In this case, the parison is the shape of malleable then described opening and imperfections and may needed complete Following process on into the casing of (cooling).

According to second change case, this is preferred (because it allows to produce the opening after the tank is moulded), should Part includes at least two parts, is each provided with a conduit or perforate and the Part II is tight after step f) The edge of tank wall upper shed outside the casing is affixed on the Part I or is fastened to, so that conduit/perforate of these parts Fluid is allowed to pass through between the box house and outside.For example, it can be on the edge of opening by being welded to the case The Part II is connected on the tank wall of the casing on the outer surface of body.Alternatively, the two parts can be provided with energy Enough assembling devices cooperated together are so that the second component is connected on first component.

In the method according to this change case of the invention, the opening manufactured on the tank wall that the part passes through the casing is with one Planting the mode of substantially anti-leak allows the fluid communication between the box house and outside.

Anti-leak, which is understood to be in relation under conditions of the N that casing is used, is contained in the case Internal liquid and/or gas.

Preferably by a compressive seal between a surface for being inserted in the part and the tank wall of the casing Presence and ensure that this for the leak-proof of liquid and gas.Used seal can have several shapes.Example As it can include an O-ring.O-ring with a circular cross-section has generated good effect.

The compressible seal member is generally made up of a kind of elastoplast or rubber.Preferably, the material quilt of the seal Selection is pair liquid contacted with the casing concave surface and gas is a kind of inert material.

The seal is preferably inserted into a groove, so as to when the part be fixed to casing tank wall when it is compressed.

When casing has a kind of tank wall of sandwich construction, the part is advantageously positioned to so that the O-ring and the case One separation layer of body is in contact.

When it is desirable that by a part, be such as connected to the ductule of an internal ventilation circuit, when being connected to the parison, examining A kind of special circumstances are considered, the loop generally includes one that one or several valves and one are used to separate liquid from steam Individual casing (to prevent liquid fuel drop to be trapped in canister, such a device vehicle zero-emission standard (U.S. " ZEV " standard) implement after be indispensable).The step of method from the above description, the ductule (and it is provided with it Valve and it is appropriate when its casing ventilation circuit) be firstly connected on the chipware.Then, the chipware for carrying the ductule is drawn Enter into parison and the mould is closed.Blown by the chipware and/or by the suction of the vacuum on rear side of pressing mold, type Base is crushed on the pressing mold of the mould.

The step for during, between the pressure in pressure and ventilation circuit in parison keep balance, the pressure Equal to the pressure of blow molding.Then the ductule is connected on parison under the auxiliary of the chipware, and the then mould It is degassed and opens to take out chipware.Pressure within this stage, the parison is equal to atmospheric pressure ventilation circuit simultaneously Interior pressure is maintained blow moulding pressure.In fact, because the parison is generally along a substantially vertical axis orientation, this A little valves, along an axis orientation relative to the substantial lateral of the parison, are in other words about 90 degree relative to vertical direction Angle.

These valves are typically switched off in this case, and the blow moulding fluid is partly trapped in the ventilation circuit In.Because the ventilation circuit is not usually complete leakproof, therefore the pressure in the loop be intended to atmospheric pressure, because, No matter their direction, due to they geometry and due between the pressure in the pressure in ventilation circuit and the parison The positive differential pressure of formation, these valves have the tendency of an opening.

Then the mould is closed to be blown into fluid under stress.At this moment, the pressure in the ventilation circuit is maintained greatly Air pressure level is balanced without being reached again with blow moulding pressure, because these valves are again turned off, and is specifically because should The Negative Pressure Difference existed between the inside and outside of ventilation circuit.When the method according to the invention proceeds, the ventilating system It is typically subjected to a high pressure (being equal to the blow moulding pressure, for example, 10 bars) and this can causes the damage of these valves.For This shortcoming is made up, is led to advantageous by perforate is manufactured on the ductule of tank wall for being connected to the casing to provide this Pressure balance between wind loop and box house.The perforate will will be closed after the blow moulding phases.

It is finally noted that in the context of the present invention, " drip molding (forms) " (or shaping work is provided for the chipware Tool) it is probably favourable, these drip moldings have adjustable temperature and its object is to help to improve thickness distribution.Once should Mould is closed (to connect these annexes) on chipware first, and multiple eyelid retractors can move these drip moldings and with making material Material shaping is with extension (to improve thickness distribution).

Brief description of the drawings

Fig. 1 to Fig. 3 purpose is some specific aspects for illustrating the present invention, without limiting its model in any way Enclose.

Fig. 1 shows two parts of a part.

Fig. 2 is shown with a unitarily formed part.

Fig. 3 correspondence one embodiment.

Embodiment

Fig. 1 shows two parts (2,3) of a part, and one of part (2) is soldered to fuel tank The inner surface of tank wall (1) and another part (3) is soldered to its outer surface.The two parts (2,3) are placed on the casing Tank wall (1) on be made one opening edge.

Fig. 2 shows the part with a single piece (2), and it is soldered to the inner surface of the tank wall (1) of a casing Go up and a part of (with a catheter shape) passes through the opening being made on the tank wall (1) of the fuel tank.Because the part is one Individual single piece and the conduit for including a tank wall for having to pass through the casing (1), when the parison is in molding, it is necessary to described The perforate on this tank wall is made in part before being secured on parison.The opening on the tank wall of casing is made in molding process Therefore the presence of mobile two formed burrs (1 ') of used pin will be observed.These burrs (1 ') are at one Complete to be removed in step.

Fig. 3 correspondence one embodiment, one part includes one be welded in the tank wall of the casing (1) interior surface Partly (2) and it is provided with assembling device.One second of these assembling devices and the part partly in the casing The assembling device of (3) is divided to be engaged.The part (3) includes O-ring (5), it and be included in the sandwich construction of the tank wall (1) Among a separation layer (4) be in contact.

Claims (16)

1. the method for producing fuel tank, what the fuel tank was provided with multiple contents and was made of plastics with one A single piece is made by moulding a parison or an at least two-part parison rived in tank wall, the fuel tank, institute The method of stating comprises the following steps：

A) parison is incorporated into a mould including multiple pressing molds under thermal softening state；

B) chipware that these annexes are placed with thereon is incorporated into inside the parison；

C) parison is pressed onto on the pressing mold of the mould；

D) these annexes are preferably laid out with one under the auxiliary of the chipware and be fastened on the parison；

E) chipware is removed and closes the mould；

F) casing is molded into by the parison；And

G) casing is removed from the mould.

2. the method according to preceding claims, wherein, at least one annex be selected from a draft tube liner, a fuel or Supply of electric power pipeline, one or more anti-fluctuation plates, a reserve tank and a fuel gauge.

3. the method according to foregoing any claim, wherein, a video camera and/or at least one are combined with the chipware The individual sensor for being used to measure such as numerical value of power, stroke, pressure and temperature.

4. according to any method of the preceding claims, wherein, at least one annex includes part, the part The conduit passed through for fluid and/or a perforate are provided with, and according to this method during step b), the portion At least a portion of part is introduced in inside the parison, during step d), and the element portion is secured on the parison, This method comprises additionally in a step, wherein an opening is made on the tank wall of the casing, this opening is limited in wherein The element portion is secured on the position of the parison, so as to make the opening or catheter patency and allow the box house with Fluid communication between outside.

5. the method according to preceding claims, it is characterised in that the part is made up of a single piece (2), and this is single Part includes the opening that a conduit and the conduit are fastened on the tank wall (1) for passing through the casing.

6. method according to claim 4, it is characterised in that the part includes at least two parts (2,3), each to set There are a conduit or perforate and part (3) is connected on part (2) or is connected to outside the casing after step f) On the tank wall (1) in portion on the edge of the opening so that the conduit of these parts (2,3)/perforate allows fluid in the box house Pass through between outside.

7. the method according to preceding claims, it is characterised in that the part (3) is by being welded to the outer surface of the casing Above it is secured on the edge of the opening of the tank wall of the casing (1).

8. method according to claim 6, it is characterised in that each in both parts part (2,3) includes group Assembling device, and be further characterized in that, part (3) is positioned on part (2) so that the assembling device cooperates jointly.

9. the method according to foregoing any claim, it is characterised in that the casing includes a sandwich construction, the multilayer Structure includes at least one thermoplastic layer and at least one separation layer (4).

10. the method according to preceding claims, it is characterised in that at least one annex includes a part, the part The conduit passed through for fluid and/or a perforate are provided with, is characterised by that this part is provided with an O-ring (5) And it is further characterized in that this part is positioned such that the O-ring (5) is in contact with the separation layer (4) of the casing.

11. a kind of method according to preceding claims, it is characterised in that the part is based on polyethylene and passes through table Face is handled, or based on a kind of material to fuel with hypotonicity.

12. according to any method of the preceding claims, it is characterised in that these annexes include an inner ventilation Loop, the loop is provided with least one valve and a ductule, is characterised by that the casing is moulded simultaneously by blow molding And it is further characterized in that the ductule has a perforate, the perforate is closed after the casing blow molding.

13. method according to claim 1 or 2, it is characterised in that these annexes include a reserve tank, the reserve tank Position be chosen to the conduit that it can be with feeding for the casing and be joined directly together connect.

14. the method according to preceding claims, it is characterised in that the connection between the reserve tank and the filling tube is Carried out in the case where being combined with the auxiliary of a flexible connection of a check valve.

15. the method according to claim 13 or 14, it is characterised in that the reserve tank is fastened by blind rivet riveting Onto the parison.

16. according to any method of the preceding claims, wherein, the chipware is provided with least one drip molding, should Drip molding there is adjustable temperature and driven by eyelid retractor so that its with the plastics shaping and extension.