CN1154902A

CN1154902A - Hot runner system

Info

Publication number: CN1154902A
Application number: CN 96100921
Authority: CN
Inventors: H·京特
Original assignee: Guenther Heisskanaltechnik GmbH
Current assignee: Guenther Heisskanaltechnik GmbH
Priority date: 1996-01-15
Filing date: 1996-01-15
Publication date: 1997-07-23

Abstract

In a hot runner system for injection moulding, a runner block has a casing in which there is at least a inner chamber for facewise insertion to cartridge heating unit comprising a heat-insulated flow tube arround which has flow passages. Said flow tube also comprises an electric heating device eg. heating coil or resistance bar etc., which is characterized in that the flow-tube is enclosed by a electric insulation layer which is rounded by said heating device in turn, said heating device is heat-conductively jointed with lower structural member to form column-shape firm core-piece.

Description

TOP-TIP

The present invention relates to the plastic injection-moulded TOP-TIP of what.This TOP-TIP comprises a runner block, this runner block has a housing, this housing has at least one in order to insert the inner chamber of cartridge heater Face to face, this cartridge heater unit comprises that one managed by heat insulation stream, this stream Guan Zaiqi face end and/or have flow channel at its circumference, this stream pipe also comprises a hot plate spare that for example can be heater coil or resistor stripe.

Traditional flow passage system comprises distributor or the manifold block that has interior fitted tube formula heater or tubular heating element, and the heat-blocking action of its this housing of relative what and/or relative this injection molding unit of what is inadequate often.Therefore, heat this runner block and just need bigger electric energy input and long heat time heating time.In addition, when being specifically related to inner heating system, it is difficult especially that cleaning work just seems.

U.S. Pat-A-3, in 091,812 disclosed flow passage system comprise one by a T shape conducting tube that joins die piece inside to around heat material feeder sleeve.The end of this T shape conducting tube is welded on the block plate, and this feeder sleeve of the relative what of this steel plate is in addition not heat insulation, and what is to cause the dissipation of a large amount of heat energy and the loss of corresponding energy.What is more, to mold temperature uncontrollable influence will be arranged.This flow passage system badly is not suitable for what or inconvenient what is cleared up because of equipping, and therefore, cleaning work must be handled and can finish with special machinery or chemical method by manufacturer.In order ceaselessly to produce, during maintaining, need use another to replace the unit inevitably.

U.S. Pat-A-3, disclose a similar TOP-TIP in 520,026, its whole runner block must heat, its heating means or connect or as from heating unit, make and locate the bust of occurrence temperature inevitably at each transmission point of plastic material with heat bridge.Must be controlled around each active force that the tonnage because of very high of this runner block produces, thus the cost that has increased design and made.

As European patent EP-B-0, disclosed another kind of hot flow path in 274,005, it comprises an independently unit, this unit comprise a plastic material feeder sleeve and one by a concentric liner ring around heater element.This unit roughly is bar shape and suitable what and inserts in its relevant housing Face to face or draw off from this housing, and this unit this housing of relative what is then undertaken heat insulation by one or more independent device.Utilize the heater coil of a resistor stripe with special shape or a power supply power supply to carry out electrical heating, so that to the less heat of this feeder sleeve end dissipation, plastic material flows and enters next workshop section by this place, feeder sleeve end to the inside of this plastic material feeder sleeve ratio.This sleeve has in order to a plurality of support rings to the below and carries out heat insulation the air gap.In operating process, all fill plastics in abutting connection with each external insulation space of this housing to have solidified.Make and assemble this structure and incur great expense, therefore, the utmost point is required to be and reduces this expense it is sought countermeasure.

For the problem that prior art is existed proposes gratifying corrective measure, purpose of the present invention makes improvements above-mentioned TOP-TIP at what, more particularly, purpose of the present invention is at distribution system or the manifold system of what exploitation with this TOP-TIP of what, and this distribution system or manifold system can be produced at an easy rate and can strengthen its machinery and thermal property significantly in simple mode.

Specific purpose of the present invention what provide a kind of can be with the minimum level transporting heat energy to this housing and this TOP-TIP is provided the device of high-level electrical security.Purpose of the present invention provides a kind of in order to install, to maintain and clear up economy and the easy device of this TOP-TIP at what.In addition, the present invention can guarantee that operating cost is cheap, because of time and the energy that it consumed all can reduce as best one can.

First kind provided by the invention comprises a runner block with the plastic injection-moulded TOP-TIP of what, this runner block has a housing, this housing has at least one in order to insert the inner chamber of cartridge heater Face to face, this cartridge heater unit comprises that one managed by heat insulation stream, end, this stream Guan Zaiqi surface and/or have flow channel at its circumference, this stream pipe also comprises a hot plate spare that for example can be heater coil or resistor stripe, this stream pipe is sealed by one deck electric insulation layer, this insulating barrier is heated device again successively and encircles, this heater element then is attached to the heat conduction structural member of its below, thereby forms the firm chipware that is bar shape.Another kind provided by the invention or second kind comprise a runner block with the plastic injection-moulded TOP-TIP of what, this runner block has a housing, this housing has at least one in order to insert the inner chamber of cartridge heater unit Face to face, this cartridge heater unit comprises that one managed by heat insulation stream, this stream Guan Zaiqi face end and/or have flow channel at its circumference, this stream pipe also comprises a hot plate spare that for example can be heater coil or resistor stripe, Guan Youyi sleeve body of this stream encircled, this sleeve body is made up of a plurality of sleeve body section portion, and each sleeve body section portion is being fixed on the ring-like supporting member of this stream pipe near this flow channel place.

First kind of TOP-TIP can have various embodiments, various embodiment have following characteristic respectively: this chipware comprises the heater coil that an a kind of heat conduction block of usefulness hides, and comprise the radial bearing and the ring-like supporting member of a plurality of axially spaced-aparts, this radial bearing radially projection exceeds the overall diameter of this chipware, stays within the housing inner chamber so that hold tightly; The shape that the position what is right after the radial bearing of this flow channel is made can be in order to the hot flow path element of direct sealed engagement such as hot-runner nozzle and/or other cartridge heater unit and/or stream pipe; The radial bearing that parallel what axis direction stretches is arranged on ring-like supporting member opposite side, so that transmit big mobile reaction force, this ring-like supporting member comprises and being arranged within this inner chamber and the sealing surfaces of contact with it not; This ring-like supporting member comprises a plurality of outside grooves in order to the longitudinal component of admitting this heater element, and this axis direction of parallel what of this outer tunnel or inclination what extends; The radial bearing of this cartridge heater unit and ring-like supporting member and its thermal conduction portions are heat insulation mutually, and comprise hollow or the otch that conducts to minimum degree in order to the heat that reduces the support region within inner chamber; The ring-like supporting member of this stream pipe is included between the external ribs axially isolated and conduct to the cannelure of minimum degree in order to the heat that reduces the support region within inner chamber; This radial bearing comprises the narrow spoke frame that is starriness of a plurality of axially spaced-aparts, and this spoke frame has three spokes at least and/or comprises a hub portion that is connected to this stream pipe securely; This radial bearing comprises that a plurality of suitable whats revolve the key that threaded portion is connected to this stream pipe by for example welding or twisting; This cartridge heater unit comprises the outer perimeter flank within the inner chamber that can fit snugly in this housing, so that separate each outside hollow chamber, this chamber is separated on axis direction.

Second kind of TOP-TIP also can have various embodiments, various embodiment have following characteristic respectively: each sleeve body section portion comprises one through shrink-on or welding and the cheap middle body that radial slot is arranged to a relevant ring-like supporting member, and this middle body is in order to closely to join its sealing surfaces to; The ring-like supporting member of each of this stream pipe has a plurality of circumference otch; This each sleeve body section portion interconnects by bridge piece at each joint gap place, and this joint gap flows by circumference flank sealed plastic; The end of each sleeve body section portion is on the axis direction overlapping at this joint gap, the operating pressure that acts on the outer hollow space between this circumference flank just makes this bridge piece become self-closing; An external support segmental arc is arranged on the direction opposite fully with each flow channel; A plurality of insulated spaces such as internal clearance or annular compartment are arranged between this chipware and this sleeve body, and this insulated space separates on axis direction each other by radial bearing, so that avoid plastics to enter in it; Have at least an annular compartment axially to extend within the unappropriated space in the end of this chipware; The end of this sleeve body is assembled on the termination case securely, and this termination case axially seals this runner housing.

This first or second TOP-TIP also has following common characteristic, be that it can comprise: the Temperature Detector within zone that extends into a sprue or ring-shaped bearing, particularly this Temperature Detector enters within the embolism of surperficial end of this cartridge heater unit; Radially (flow channel) or for example replace one the biasing embolism plastics feeding perforate is set Face to face; For forming H font or chiasma type runner, within the housing inner chamber, insert two or above cartridge heater unit, this cartridge heater unit extends to each other at an angle, and each flows seal of tube ground and connects a tubulose otch with sleeve body section portion of a ring-like supporting member; The cartridge heater unit that intersects is fixed within this housing with latch, and should stream Guan Ze at place, cartridge heater unit that each traversed by is provided with by the surperficial overhang bracket of shrink-on section.

According to the characteristic of a kind of TOP-TIP of the present invention at what, whole cartridge heater unit is designed to easy what and is located in face-to-face within the inner chamber of a runner block housing of what, in this cartridge heater unit, a stream of the relative what of electric heater pipe is an electric insulation, but this heater then is attached to the heat conduction structural member of its below, so that form a firm chipware that is bar shape haply.More particularly, determining deviation or become the spacing heater coil and can hide with a kind of heat conduction, the composite block that contains aluminium, and this cartridge heater unit, particularly should flow pipe itself, the radial bearing that can comprise a plurality of axially spaced-aparts, this supporting member radially extends beyond the overall diameter of this chipware, so that be a tight fit within this housing inner chamber.

In a preferred embodiment of the invention, this TOP-TIP comprises the radial bearing of this stream pipe in the what flow channel, this radial bearing make its shape can in order to the direct sealed engagement of other hot flow path element, this hot flow path element can be nozzle and/or additional cartridge heater unit and/or stream pipe.The radial bearing that axis direction of parallel what stretches can be arranged on the opposite side of ring-like supporting member, so that transmit big mobile reaction force, this ring-like supporting member can comprise and being arranged within this runner block inner chamber and the sealing surfaces of contact with it not.This radial bearing can comprise that also axis direction of a plurality of parallel whats stretches or the outer groove of relative this axis direction slant dilation of what, and this outer groove is in order to vertical bridging part of the heater within the zone that is received in this flow channel.

The present invention adopts a kind of structure very easily, and this radial bearing of each cartridge heater unit is heat insulation with its thermal conduction portions, and is particularly heat insulation with this composite block.If this radial bearing be designed to comprise for example otch, hollow, cannelure etc. are feasible can be with minimum degree conduction heat energy, just can save lot of energy in the support region of this inner chamber.The narrow spoke frame that shape is the axially spaced-apart of star can guarantee and fully the engaging of this internal chamber wall that dissipate internally but will limit heat energy, this spoke frame has at least three spokes.Preferred radial bearing can comprise a hub portion, and this hub portion becomes integrally or securely to link together with this stream pipe by welding or soldering.

On the other hand, for example can redial key be fixed on this stream pipe, so that what is installed this stream pipe or this housing respectively by a fixed screw or by welding.The mode that another kind is fixed this stream pipe is to use the bolt of external engagement, setscrew etc., thereby just its Hou of what is adjusted.The present invention also imagines various embodiment, comprising under the situation of the end that need not clamp this stream pipe and fix this stream pipe.In addition, can imagine has the mobile outlet of a plurality of outfits with the assembling lining, and each outlet of flowing is in order to assemble a nozzle, and this lining preferably has two in order to closely to encapsulate the bevelled edge of adjoining nozzles.

In order to obtain optimum heat-blocking action, this cartridge heater unit can have in order to the outer perimeter flank within this inner chamber of tight fit what, makes that each outside hollow chamber is separated from one another on axis direction.

Another remarkable characteristic of the present invention is at what, and this TOP-TIP has a sleeve body, and this sleeve body is encircled this stream pipe, and is the part of a cartridge heater unit treating to be inserted into Face to face this housing.This sleeve body can comprise a plurality of sleeve body section portion, and each sleeve body section portion then permanently is connected on the annular radial supporting member in the zone that is arranged on a flow channel.Its result forms a kind of highly stable complex, and the inside of this complex can not enter for the plastic material in the processing, and this is that the whole length by this outer cover cylindrical shell of what is a kind of structure of sealing.Therefore, no matter the length of this runner itself how, it determines a heat insulation space, thereby the heat of portion's generation within it mainly is transferred in this plastic material, has only a spot of heat that the phenomenon of outside loss can take place in some little support region of radial bearing.

If when each sleeve body section portion comprised a shrink-on or is welded on the middle body of a radial slot on the relevant ring-like supporting member, the stability of structure of this TOP-TIP was improved greatly.In addition, compare with the traditional hot flow passage system, the cost of its manufacturing also can reduce greatly.

The advantage of design and the saving of effective energy consumption are achieved by circumference otch in each ring-like supporting member and/or outside groove.Between this chipware and this sleeve body, can have insulated space.The uncontrollable heat energy loss that is had with prior art is opposite, and the very narrow supporting member of minority between this stream pipe of the system of novelty of the present invention what only on the throne and this housing inner chamber allows reproducible small amount of thermal energy transmission.

If this sleeve body section portion is by interconnecting overlappingly at the joint gap place, just can obtain bigger advantage.This joint gap seals the plastics that flow by dividing plate, in operating pressure acts on space outerpace or chamber between the circumference flank, just makes this overlap self-closing.This high operating pressure will effectively be bearing in outside overlap, thereby it is pressed onto this inside overlap, so that realize more desirable sealing function.Middle sleeve body section portion will change the caused phenomenon of expanding with heat and contract with cold because of temperature conditions in the compensating operation process.

At least one annular compartment a chipware end can axially stretch and enter in the unappropriated space, and feasible heat conduction towards this housing also can reduce.On the one hand, this TOP-TIP has stability significantly, on the other hand, can be fixed firmly to the also easy what of termination case by the end with this sleeve body connection and cleaning work are achieved, and this termination case then axially seals this runner housing.A Temperature Detector may extend within the zone of a ring-like supporting member, for example extends among the embolism of surperficial end of this cartridge heater unit; Therefore, this heater is to control with the actual temperature in abutting connection with the inside of this sprue.

Feeding perforate such as the import of flowing can radially be arranged in this cartridge heater unit.Linearly the shape structure is very convenient for what for this.For what at angle or crooked runner, preferably has an axial feed perforate in a surperficial end of this cartridge heater unit.

By making a surperficial end of a stream pipe engage the tubulose otch of sleeve body section portion hermetically and can form H font or chiasma type runner to be inserted into the housing inner chamber each other at an angle at least two cartridge heater unit with a ring-like supporting member.Therefore, this housing inner chamber can intersect each other, and the mutual intersection of this housing inner chamber is the cartridge heater unit that fixedly is inserted into of what and make it stable just.Available pin member is fixed this TOP-TIP, and each horizontal cartridge heater unit of what was supported Face to face by the end of for example sleeve body section portion of shrink-on relatively and should flow pipe.

Other characteristic of the present invention, details or advantage can be applied for a patent the interest field claim and followingly show the explanation of the most preferred embodiment the what accompanying drawing and clearly be familiar with from what enclose.

Fig. 1 is the axial cutaway view of a hot flow path;

Fig. 2 is the transverse sectional view of taking from along the II-II hatching line of the runner among Fig. 1;

Fig. 3 is the transverse sectional view of taking from along the III-III hatching line of the chipware of the runner among Fig. 1;

Fig. 4 is the axial cutaway view of a chiasma type runner;

Fig. 5 is the schematic diagram of a TOP-TIP;

Fig. 6 is the axial cutaway view of the hot flow path of a remodeling;

Fig. 7 is the transverse sectional view of taking from along the VII-VII hatching line of the runner among Fig. 6;

Fig. 8 is the transverse sectional view of taking from along the VIII-VIII hatching line among Fig. 6;

Fig. 9 is the axial cutaway view of another runner embodiment;

Figure 10 is the transverse sectional view of taking from along the X-X hatching line of the runner among Fig. 9;

Figure 11 is the transverse sectional view of taking from along the XI-XI hatching line among Fig. 9;

Figure 12 is the section axial cutaway view of another hot flow path part;

Figure 13 for the hatching line XIII-XIII hatching line among corresponding what Figure 12 and comprise off-axis to the cutaway view of element;

Figure 14 is and another hot flow path phantom partly;

Figure 15 is and the cutaway view of another embodiment;

Figure 16 is the top view of the hot-runner nozzle that uses with the hot flow path shown in Figure 14 and 15.

Fig. 1 illustrates a runner 10.This runner 10 comprises a housing 12, and this housing 12 has an inner chamber 14, and cartridge heater unit 16 can insert among this inner chamber 14 of what.A termination case 18 is respectively arranged at its both ends, and it can play the axially effect of closed this cartridge heater unit 16 in this housing 12.In this example, this cartridge heater unit 16 comprises a sleeve body 20, and this sleeve body 20 is made up of a plurality of sleeve body section portion; More particularly, this a plurality of sleeve body section portion comprises: central sections portion 21, and then some interludes portion 24, changeover portion portion 22 and in the end segment portion 23 of two sides arranged.Have the joint gap 25 that has overlap 26 between the section portion of corresponding two adjacency, when the temperature in this corresponding zone changes, then allow this overlap 26 to expand with heat and contract with cold.In addition, each forms the sealing of a self-closing to overlap 26.

This sleeve body 20 has outer circumferential flank 50, this this inner chamber 14 of flank 50 tight fits, and this flank 50 is very narrow, so that reduce degree towards these housing 12 transporting heat energies.Strengthened heat-blocking action between this cartridge heater unit 16 and this housing 12 at the space outerpace between this circumference flank 50 or cavity 52.Closely be assembled to this inner chamber 14 places by these flanks 50 of what, then these space 52 common plastics that just do not have in the processing enter in it.If under ideal situation least, when having any plastic material to enter this space 52 unexpectedly, tonnage will force the outside overlap of this adjacency on the relevant overlap.Like this, just can get rid of the plastic material that any attempt flows to and enter gap 54, this gap 54 forms an annular compartment usually, and it is also in addition heat insulation with this outer cover cylindrical shell 20 and inner core member 30.This inner core member 30 is by stream pipe 32 supportings, electric insulation layer 39 of these stream pipe 32 supportings (schematically illustrates among Fig. 1, because of this insulating barrier is extremely thin) and a heater coil 38, these heater coil 38 heeling-ins and be fixed among the heat conduction composite block V, this heat conduction composite block mainly comprises aluminium.

The opposite side of tubulose otch of 35,36 these sleeve bodies 20 of what of flow channel that comprises this stream pipe 32 of a sprue 34.Plastic material in the processing enters by this sprue 34 through a feeding perforate 35, and through two or more multiple exit 36 leave this sprue.The direction that the M of plastic material shown in Fig. 1 flows.

In the zone of

flow channel

35,36, this sleeve body 20 utilizes the wide radial support thing or the ring-like supporting member 40 (referring to Fig. 2 and 3) of this stream pipe 32 to be fixed on this chipware 30.A plurality of outside groove 44 each longitudinal component 48 of this chipware 30 of the axis direction of this stream pipe 32 of parallel what in order to admit a heater coil 38.This groove 44 also hides with sealed composite V, so that form the bridgeware of high heat conduction in the different piece of this heater.

In case with the Hou of composite filled this heater coil 38 of sealing and this outside groove 44, but this sleeve body 20 just shrink-on on this chipware 30.Respectively independently sleeve

body section portion

21,22,23 and 24 will closely be assemblied on the corresponding ring-like supporting member 40 of this stream pipe 32.Therefore, the flow channel of this hot flow path is extended to corresponding tubulose otch 28 by direct shape-cooperation, each sleeve body section portion of opposite side at this tubulose otch comprises a supporting segmental arc 51, and this supporting segmental arc 51 accepts to impel under the origin what operating pressure the mobile reaction force that is produced of plastic material M.

Ring-like supporting member 40 have a plurality of on axis direction the external ribs 42 of a segment distance separated from one another, make between corresponding two flanks of 41 whats of each cannelure that this flank 42 also evenly distributes on the major part of this circumference.Have only this narrow flank 42 and this support region 40/46 can extract heat energy internally out and also this heat energy is outwards dissipated, thereby save a lot of energy.Outside groove 44 on this ring-like supporting member 40 can tilt.If during twist around shape, its spacing must be able to cooperate this heater coil around circle.

The outside of this cartridge heater unit 16 comprises a plurality of heat insulation annular compartments 54, and each chamber 54 provides the gap respectively between the different sleeve body section portion 21 to 24 of this chipware 30 and this sleeve body 20.On an axial direction, each annular compartment 54 is except that being subjected to the slight blocking-up at this corresponding ring-like supporting member 40 and central support zone 46, and this annular compartment is continuous.In two ends of this annular compartment, unappropriated axial space 64 will guarantee best heat-blocking action.Two ends of this sleeve body 20 can be by 18 supportings of the termination case on the axis direction, and this termination case 18 also has a plurality of spaces 52 in the face of limit formation on axis direction A.

This sprue 34 of this TOP-TIP 10 can be closed on axis direction by being biased in abutting connection with this embolism 56 that exports 36 places.One of this embolism 56 (right hand portion of part Fig. 1) but one of clamping is bearing in the Temperature Detector 60 in the obturating plug 58 of relevant termination case 18.A connector 62 directs into this compound-heeling-in heater coil 38.

A main characteristic of this chipware 30 is at what, this chipware 30 is made by the stream pipe 32 of this covering, and only reach the outer dia D (seeing Fig. 2 and 3) that exceeds this heater coil 38 at each ring-like supporting member 40 a little in the end of this chipware 30, make that this compound-covering heater coil 38 is supported reliably.What is that this chipware 30 just can easily insert in this sleeve body 20, so that fixedly what is on it.With the independently sleeve body section portion shrink-on of this sleeve body 20 time, the radially projection zone of this ring-like supporting member 40 and flank 42 thereof is changeable closely to be engaged.Its result, this compound cartridge heater unit 16 just forms the very stable and firm structure of high thermal resistance.

The realization that this cartridge heater unit 16 allows in order to the hot flow path embodiment of the variegated goods of injection moulding.Example as shown in Figure 4 is wherein, many to parallel perpendicularly put cartridge heater unit 16 aligned with each other in the inner chamber 14 and intersected by above and below and horizontal cartridge heater unit and intersect at two.Utilization adds up to the runner that five identical cartridge heater unit 16 is configured to a H font, and its each sprue 34 is complete in flowing-connecting.Each face to vertically aligned cartridge heater unit 16-Bian end is connection like this, makes different sprue 34 directly flow out the outer flow channels of the cartridge heater unit that enters this level through a tubulose otch 28.Having only this horizontal cartridge heater unit is by embolism 56 closures (seeing the right hand portion of Fig. 4) on axis direction.

With fixing pin member 66 vertical cartridge heater unit 16 is fixed within this block 12, that is is fixed on the hot flow path loading plate.Therefore, can determine the horizontal level of the cartridge heater unit 16 that this is horizontal, the termination case 18 of the cartridge heater unit that this is horizontal also plays a part to guarantee its axial location.This each endsocket body section portion 23 is that shrink-on is on the shoulder of the end of this stream pipe 32, and should flow pipe 32 engages these horizontal cartridge heater unit 16 through the interlude portion 24 of sleeve body section portions each ring-like supporting member 40, the effect of supporting this vertical cartridge heater unit 16 is Face to face played by this each endsocket body section portion 23, makes the reaction force that is caused in the plastics injection process to distribute reliably and equably.

In a kind of compact manifold-type of saving the space designs, this stream pipe 32 is a kind of double pipe or multiple pipe, this double pipe or multiple pipe have an interconnection in abutting connection with these sprue 34 places, this passage directs into a parallel fluid channels (not shown) in corresponding exit position, this runner comprises two outlets, causes always having four flow channels 36.Utilize another parallel runner again, this another parallel flow passage is connected to respectively this outlet, this another parallel runner can be contained within the cross section of this stream pipe 32 at an easy rate, as in schematically showing what Fig. 5, if do not consider the arrangement of this actual body, the number of this flow channel 36 can turn over again.Be to be understood that in a certain embodiments, each runner in succession can be arranged to and be a right-angle relationship with previous runner rather than be parallel to each other with it, thereby can form the intersected blocks volume array.Each flow path that equates is towards all passages or export 36 and draw at what for its important characteristic, and it all is the same making pressure in all outlet ports position fall, thereby guarantees the quality uniformity of molded goods.

Be to be understood that, the change in size that is caused by what heat expansion and shrinkage in the various operational phases can not influence the function of this TOP-TIP 10, the marked difference of this TOP-TIP and prior art is at what, TOP-TIP 10 of the present invention can provide equal control transfer of heat at all flow channels, side by side can produce even temperature and distribute.The narrow support region of the present invention and the cavity or the unappropriated space of sealing cause good heat-blocking action, make the temperature of this runner housing 12 preferably wait the temperature of what mould approximately, that is about 80 ℃, and the temperature of the in-process stock in this stream pipe 32 can be up to 300 ℃.So high temperature difference can cause change in size, yet this variation does not influence this cartridge heater unit 16.Its chipware 30 is to remain on regularly in the housing inner chamber 14, makes best maintenance work also still can realize under serious high temperature and high pressure state.The same section of this electric heater 38 may be received in this stream pipe 32 the feeding perforate dual side-edge and do not need end at this stream pipe with it clamping.Usually suitablely adopt 230 volts of power supplys, but its structure can be retrofited suitably also, so that be suitable for the what LVPS, for example its voltage is the power supply of 24 volts or 5 volts.

The another kind of TOP-TIP 10 of the present invention is implemented among illustration what Fig. 6 to 8, and it comprises the cartridge heater unit 16 of a simplification, and this cartridge heater unit 16 does not have sleeve body 20.Herein, 32 and firm short tube keys of this stream pipe are made one, this short tube key comprises

flow channel

35,36, preferably and have a flat surfaces 40, so that other hot flow path elements of shape-cooperation what directly, this hot flow path element can be the injection machine nozzle connection (top that partly shows what Fig. 6) of for example this feeding perforate 35 of position what and the hot-runner nozzle 11 of this opening 36 of position what (part is shown the bottom of what Fig. 6).Radial bearing can comprise the supporting member 51 of the opposite side of the corresponding flow channel 36 of a what equally; Shown in Figure 6, the opposite side of this feeding perforate 35 has a key, and this key is engaged by a set bolt 37, thereby can prevent that this cartridge heater unit 16 from rotating or mobile this housing inner chamber 14 in.

Fig. 7 and 8 is sectional view, and very narrow radial bearing 49,51 is shown, and this narrow radial bearing causes the support region that forms minimum degree within this inner chamber 14.There are a plurality of radial bearings 49 at place, centre position between

flow channel

35 and 36 respectively, and the shape of this radial bearing 49 is got the spoke frame that is starriness, and this spoke frame respectively has three spoke 50 (see figure 8)s.The longitudinal component 48 of this heater coil 38 too heeling-in among the composite block V of this chipware 30, and the power supply of the most handy 230 volts of voltages of this heater coil power supply.

Identical with aforementioned cartridge heater unit on cartridge heater unit 16 structures shown in Fig. 9 to 11, this cartridge heater unit 16 comprises a heater 38 with the bar-shaped heater of working under low voltage, it for example is 24 volts or 5 volts that this voltage can be low to moderate.In the outside of stream pipe 32 and/or providing with an electric insulation layer with each the bar-shaped heater place that forms this chipware with heat conduction composite block V covering.This connector 62 can be fixed in the termination ring 19, keeps 56 on the embolism of a Temperature Detector 60 to pass through this termination ring 19 insertions.Should be noted that respectively this radial bearing 49 can respectively comprise four spokes 50 (Figure 11), also can adopt though have other spoke framework shapes of the spoke of varying number.

Embodiment shown in Figure 12 and 13 describes a cartridge heater unit 16, the chipware 30 of this cartridge heater unit comprises a firm stream pipe 32, this stream pipe 32 is by 56 closures of a biasing embolism, and the embolism 56 of should setovering engages with the shoulder 57 of a retainer shape.In the zone of this flow channel, for example export in 36 the zone, wall thickness of this stream pipe 32 reduces, and is directly engaged by the top of the shape-cooperation of this relevant hot-runner nozzle 11 so that form flat surfaces 40.Fixed screw 69 play its axially and in the radial position this stream of locking manage 32 effect.The radial bearing of this stream pipe 32 is this key 68 respectively, and it can be short body (seeing the top of Figure 13), preferably with it grouping, makes two pairs of keys 68 be placed in the dual side-edge of this nozzle 11 and the 5th key is bearing in this this stream that exports 36 opposite sides and manages 32 zones.Should be noted that as a special characteristic this radial bearing 68,69 is heat insulation by the air gap or the heat insulation loop 74 for example made by pottery, this heat insulation loop 74 around this key 68,69, makes that heat conducting path is longer in this heat conduction composite block V.Particularly, in order to reduce heat dissipation internally, this key 68,69 can be made with low heat conducting material such as nickel-chromium steel.

Comprise a kind of rivet-like radial bearing 65 at another embodiment shown in Figure 14 and 15, this radial bearing is bonded between this inner chamber 14 and this stream pipe 32, and this stream pipe 32 is included in the part of the ring-like supporting member 40 of this admittance that exports 36 opposite sides.The top of this outlet 36 hot-runner nozzle 11 that directly shape-cooperation what should be relevant, this hot-runner nozzle is by geat cover 67 (the seeing Figure 16) that the air gap is heat insulation, 11 at this nozzle accurately remains on its friction tight position and engages this exit surface.Can be clear that from Figure 14 and 16 top of this hot-runner nozzle 11 or this geat cover 67 can comprise an inclined surface 72, this inclined surface 72 allows closely to load the adjacent nozzles that is positioned to right-angle relationship, so that use the required poly array of what.An annular groove 73 can be in order to the lip ring (not shown) of admitting one for example to be made of metal, so that closely seal this matching surface 40/11.

Above describe and explain with regard to most preferred embodiment of the present invention, for what those of ordinary skill in the art, do not breaking away under the spirit and principles in the present invention, multiple remodeling and distortion are obviously feasible, and the spirit and principles in the present invention also liken to and are the restriction to concrete form of the present invention.

Claims

1. one kind with the plastic injection-moulded TOP-TIP of what, it comprises a runner block (10), this runner block (10) has a housing (12), this housing (12) has at least one inner chamber (14) in order to insert cartridge heater unit (16) Face to face, this cartridge heater unit (16) comprises that is subjected to a heat insulation stream pipe (32), this stream pipe (32) has flow channel (35 in its surperficial end and/or at its circumference, 36), this stream pipe (32) also comprises an electric heater (38) that for example can be heater coil or resistor stripe, its characteristic is at what, this stream pipe (32) is sealed by one deck electric insulation layer (39), this insulating barrier (39) is encircled by this heater (38) again successively, this heater (38) then is attached to the heat conduction structural member of its below, is the firm chipware of bar shape (30) thereby form.

2. TOP-TIP according to claim 1, its characteristic is at what, and this chipware (30) comprises the heater coil (38) that an a kind of heat conduction block of usefulness (V) hides, and comprises the radial bearing and the ring-like supporting member (40 of a plurality of axially spaced-aparts, 49,50,51), this radial bearing (40,49,50,51) radially projection exceeds the overall diameter (D) of this chipware (30), stays within the housing inner chamber (14) so that hold tightly.

3. TOP-TIP according to claim 2, its characteristic is at what, the position what is right after the shape of the radial bearing (40) of this flow channel (35,36) and makes and can and/or flow the hot flow path element of managing (32) in order to direct sealed engagement such as hot-runner nozzle (11) and/or other cartridge heater unit (16).

4. TOP-TIP according to claim 2, its characteristic is at what, each radial bearing (51) that parallel what axis direction (A) stretches is arranged on the opposite side of ring-like supporting member (40), so that transmit big mobile reaction force, this ring-like supporting member (40) comprises and being arranged within this inner chamber (14) and the sealing surfaces of contact with it not.

5. TOP-TIP according to claim 4, its characteristic is at what, this ring-like supporting member (40) comprises a plurality of outside grooves (44) in order to the longitudinal component (48) of admitting this heater (38), and this parallel what of outside groove (44) or this axis direction of inclination what (A) extend.

6. TOP-TIP according to claim 2, its characteristic is at what, the radial bearing of this cartridge heater unit (16) and ring-like supporting member (40,49,69) heat insulation mutually with its thermal conduction portions, and comprise in order to reduce hollow or the otch (41,44) that within this inner chamber (14) heat of support region is transmitted to minimum degree.

7. TOP-TIP according to claim 4, its characteristic is at what, and the ring-like supporting member (40) of this stream pipe (32) is included between the external ribs (42) axially isolated and in order to reduce the cannelure (41) that within inner chamber (14) heat of support region conducts to minimum degree.

8. TOP-TIP according to claim 2, its characteristic is at what, this radial bearing comprises the narrow spoke frame (49) that is starriness of a plurality of axially spaced-aparts, and this spoke frame (49) has three spokes (50) at least and/or comprises a hub portion (53) that is connected to this stream pipe (32) securely.

9. TOP-TIP according to claim 2, its characteristic are at what, and this radial bearing comprises that a plurality of suitable whats are connected to the key (68) that this stream is managed (32) by for example welding or the stubborn threaded portion (69) that revolves.

10. TOP-TIP according to claim 1, its characteristic is at what, this cartridge heater unit (16) comprises the outer perimeter flank (50) within the inner chamber (14) that can fit snugly in this housing, so that separate each outside hollow chamber (52), this chamber (52) is separated on axis direction.

11. one kind with the plastic injection-moulded TOP-TIP of what, it comprises a runner block (10), this runner block (10) has a housing (12), this housing has at least one inner chamber (14), this inner chamber (14) is in order to insert cartridge heater unit (16) Face to face, this cartridge heater unit (16) comprises that is subjected to a heat insulation stream pipe (32), this stream pipe (32) has flow channel (35 in its surperficial end and/or at its circumference, 36), this stream pipe (32) comprises that also one for example is the electric heater (38) of heater coil or resistor stripe, its characteristic is at what, this stream pipe (32) is encircled by a sleeve body (20), this sleeve body (20) is by a plurality of sleeve body section portion (21,22,23,24) form, each sleeve body section portion locates to be fixed on the ring-like supporting member (40) of this stream pipe (32) at close this flow channel (35,36).

12. TOP-TIP according to claim 11, its characteristic is at what, each sleeve body section portion (21,22,23,24) comprise a process shrink-on or welding and be connected to a middle body that radial slot is arranged (46) on the relevant ring-like supporting member (40), this middle body is in order to closely to join its sealing surfaces to.

13. TOP-TIP according to claim 11, its characteristic are at what, each ring-like supporting member (40) of this stream pipe (32) has a plurality of circumference otch (42,44).

14. TOP-TIP according to claim 11, its characteristic be at what, this each sleeve body section portion (21,22,23,24) locate to interconnect by bridge piece (26) at each joint gap (25), this joint gap (25) flows by circumference flank (50) sealed plastic.

15. TOP-TIP according to claim 14, its characteristic is at what, each sleeve body section portion (21,22,23,24) end is in axis direction (A) at this joint gap (25) and goes up overlappingly, acts on operating pressure in each outer hollow space (52) between this circumference flank (50) and makes just respectively that this bridge piece (26) becomes self-closing.

16. TOP-TIP according to claim 11, its characteristic are at what, an external support segmental arc (51) is arranged on the direction opposite fully with each flow channel (35,36).

17. TOP-TIP according to claim 11, its characteristic at what, have a plurality of insulated spaces such as internal clearance or annular compartment (54) between this chipware (30) and this sleeve body (20), this insulated space is by radial bearing (40,46; 42; 51) on axis direction (A), separate each other, so that avoid plastics to enter in it.

18. TOP-TIP according to claim 17, its characteristic at what, have at least an annular compartment (54) axially to extend within the unappropriated space (64) in the end of this chipware (30).

19. TOP-TIP according to claim 11, its characteristic are at what, the end of this sleeve body (20) is assembled on the termination case (18) securely, and this termination case (18) axially seals this runner housing.

20. according to claim 1 or 11 described TOP-TIPs, its characteristic is at what, Temperature Detector (60) within zone that extends into a sprue or a ring-shaped bearing piece (40), particularly this Temperature Detector (60) enters within the embolism (56) of surperficial end of this cartridge heater unit (16).

21. according to claim 1 or 11 described TOP-TIPs, its characteristic is at what, radially (flow channel (35)) or for example replace a biasing embolism (56) that a plastics feeding perforate is set Face to face.

22. according to claim 1 or 11 described TOP-TIPs, its characteristic is at what, for forming H font or chiasma type runner, within housing inner chamber (14), insert two or above cartridge heater unit (16), this cartridge heater unit (16) extends to each other at an angle, each stream pipe (32) connects the tubulose otch (28) of a sleeve body section portion with ring-like supporting member (40) (for example 21,22) hermetically.

23. according to claim 1 or 11 described TOP-TIPs, its characteristic is at what, the cartridge heater unit (16) that intersects is fixed within this housing (12) with latch (66), and this stream pipe (32) is then located the surperficial overhang bracket by each shrink-on section in the cartridge heater unit (16) that each traversed by is provided with.

24. TOP-TIP according to claim 23, its characteristic is at what, the cartridge heater unit (16) that intersects is fixed within this housing (12) with latch (66), and this stream pipe (32) is then located the surperficial overhang bracket by each shrink-on section in the cartridge heater unit (16) that each traversed by is provided with.