DE3145887A1 - METHOD AND DEVICE FOR PRODUCING TURBULENCE-GENERATING PARTS FROM RESIN - Google Patents

Description

description

The invention relates to a method and a device 5

for the manufacture of turbulence generating parts (turbulence parts) of a synthetic resin, which in the form of pieces in the flow path of a fluid in a heat exchanger such as a radiator or - are used ₀ cooler, whereby the effect of the heat radiation or heat absorption of the heat exchanger can be increased .

There are already turbulence parts made of a thin metallic tape has been proposed, which is made up of two by undulating

Molds or the like / formed strips with different

Put the phases together. These turbulence parts

of the fluid have been used in a heat exchanger such as an Example Radiat ° ^r or the like., to swirl to the fluid, thereby increasing the effect of heat radiation or absorption in the form of pieces in the flow path.

However, these metallic turbulence parts have disadvantages.

When these are rolled up on reels, the backs of the wavy strips are crushed, whereby, the strips become entangled, with the result that the metallic turbulence pieces / a prescribed length, into which the metallic turbulence parts are cut, remain curved in the form of an arc, after which the curved sections must be straightened individually by hand before the turbulence pieces enter the Flow path of the fluid can be used in the heat exchanger. This requires a very inconvenient Work and a lot of time and effort and there the turbulence pieces are made of metal, the weight of the heat exchanger increases.

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line object of the invention is to provide a method of manufacturing turbulence-generating parts made of plastic with the greatest accuracy

^ a high working speed,

e ■ ...- ■

Another object of the invention is to provide an apparatus for producing turbulence generators Parts made of plastic, which are characterized by particularly high accuracy at a high working speed,

To achieve the object of the invention described above, there is a method for producing turbulence Generating parts made of synthetic resin provided, in which the melted under the action of resin in a

j§ EKtrudiervorr ich device is extruded from a slot of a rotatable nozzle of the extruder f while the molten resin is rotated about its main axis, which automatically provides the molten resin with a • helical twist and then the extruded resin is then passed through water is, wherein the extruded resin cools and solidifies, Furthermore, a device for the production of turbulence-generating parts made of synthetic resin is provided, which provides an extrusion device for melting the resin by means of heat and for extruding the molten resin, a rotating nozzle which is rotatable at the front end the extruding machine is arranged and has a slot with which the molten resin can be rotated about its major axis while it is extruded from the slot of the rotatable nozzle, with a water tank filled with water for cooling and solidifying the extruded resin and with a trigger device for removing the cooled and solidified resin.

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These and other features of the invention are explained in more detail below with reference to the drawing. Show it:

Fig. 1 is a perspective view of a

conventional turbulence generating part,

2 shows a cross section through a radiator

.. ge with turbulence generating parts

according to Fig. 1,,

Fig. 3 is a schematic representation of a

Embodiment of a device

- ^ j- to create turbulence

lowing part mouse plastic according to the invention,

Fig. 4 shows a cross section through the in the

Device according to Fig. 3 used

Jet,

Fig. 5 is a schematic representation of a

Device for cutting the by means of the device of FIG. 3 Herge

made turbulence-generating parts made of plastic in predetermined pieces Length,

Fig. 6 shows an embodiment of a slot

and a perspective view of a turbulence generating part, that was created using this slot,

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, Fig. 7 shows another embodiment of a

Slot and a perspective view of one with the help of this Created vortex

generating part, 5

Fig. 8 shows another embodiment of a

Slot and a perspective view of one with the help of this

_n slot created turbulence

generating part and

Fig. 9 is a schematic representation of a

further embodiment of a

jc direction for making Turbu

Bilge generating parts made of plastic according to the invention.

As shown in Figure 1, there is conventional turbulence generating part 10 made of a thin metal strip which is so formed by press molding or the like. That it is composed of two undulating strips of different phases.

20 to 30 turbulence-inducing pieces 10 are, as in FIG 2, inserted into the flow path 14 of hot water in a radiator 12 to stir the water or to swirl, whereby the transfer efficiency of the heat to the ribs 16 increases and the effect of thermal radiation is increased.

However, these turbulence-generating parts 10 made of metal have disadvantages. When these parts are on a reel are rolled up, the backs of the undulating strips are compressed, entangling the strips and, since the pieces are of a given length, in

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which the turbulence generating parts are cut, then have arcuately curved sections, these curved sections must be individually bent back by hand are prior to the insertion of the turbulence-generating pieces in the flow path 14 of the fluid, which is very troublesome and requires a lot of time and effort. In addition, since the turbulence-generating pieces are made of metal, it increases the weight of the radiator 12.

-, Q Under these circumstances there were a procedure and a Apparatus for the production of turbulence-generating parts which eliminate the disadvantages described above, in great demand.

The present invention is according to that mentioned above Requirements executed.

The invention is described in detail with reference to one in the Figures 3 to 8 illustrated embodiment shown in detail.

The method of the present invention is described in connection with the apparatus, since the method can be viewed as a function of the device.

Denoted at 20 is an extruder in which synthetic resin is melted using heat and is extruded from its outlet; 22 denotes a funnel, 24 a screw spindle and 26 one Forming head.

The forming head 26 is on its underside with a line section 30 for guiding the molten resin from the extruder 20 into the vertical Direction and provided with a thickened cylindrical portion 32 which protrudes downward.

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Denoted at 34 is a cap-like rotatable nozzle, which is the underside of the thickened portion 32 and which is rotatably arranged on the outer peripheral surface of the thickened portion.

A slot 36 is in the central front end of the nozzle

34 and stands with the line section 30 of the thickened portion 32 in connection. The slot can be in the form of a straight opening or a lot jQ number of radially extending from the center point Openings may be formed as shown in Figures 6 (A), 7 (A) and 8 (A).

The rotatable nozzle 34 · is at a variable speed. with the help of a chain that is connected to a ge variable speed drive device (not shown) formed on the outside of the nozzle Teeth 38 is connected. Suitable gears, a drive belt or the like. Be used.

Below the front end of the rotatable nozzle 34, a water tank 42 is arranged, which has a depth of about 1 meter and filled with water is for cooling the resin extruded from the slot 36.

The distance between the surface of the water in the water tank 4 2 and the bottom of the nozzle 34 can be can be adjusted by providing the water tank 42 with a water inlet and a water outlet valve is in that the water tank 42 is mounted on a suitable support that is adjustable in height is, or the like.

With a role 44 is referred to, the bottom within the water tank 42 opposite the front end of the

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Nozzle 34 is arranged and 46 denotes a guide roller, which is arranged at the top within the water container 42.

A trigger 48 is with a pair of itself 5

opposite feed rollers 50a and 50b for pulling off of the resin from the water tank, the withdrawal speed being as great as the speed of the extruder 20 and where the

Resin is passed between the feed rollers. At 52 10

is a take-up reel · for the resin.

A first embodiment of the device according to the present invention is constructed as described above.
Ip

The operation of the first embodiment is shown in Connection with the appropriate procedure.

_on resin particles are fed into the hopper 22 and melted by heat in the extruder 20, the molten resin is conveyed to the conduit section 30 of the thickened portion 3 2 by the screw 24 and then vertically into the to

oc downward direction from the slot 36 of the rotatable Nozzle 34 extruded. If the downward direction is slightly inclined, the molten one will hang Resin due to its own weight vertically downwards. Therefore, the downward direction is preferable perpendicular. The resin is then fed into the interior of the water tank 4 2, guided to the underside of the roller 44, from there to the top of the guide roller 46, the conveying direction being reversed, then wedged between the feed rollers 50a and 50b of the take-off device 48 and onto the take-up reel 52 wound up.

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■ j ^ In the procedure described above, the resin passed into the interior of the water tank 42 while it is about its vertical axis by the action of rotatable nozzle 34 is rotated. The Harz meets with

_c the resistance from the water in the water tank and b

the part of the resin that has cooled and solidified and with the lower surface of the roller 44 in the state the non-rotation is held. Between the front one At the end of the nozzle 34 and the surface of the water, the resin is automatically twisted, then it cools down and solidifies in the water container and is then continuously withdrawn by the withdrawal device 48. Turbulence generating pieces 60 of a predetermined length are obtained by conveying the turbulence generating

_15th Part withdrawn by the haul-off device 48 to a supply apparatus 54 capable of continuously supplying the turbulent part of a predetermined order of magnitude, the turbulent part being cut and stored as shown in FIG. However, it can also be introduced directly into the flow path of the fluid in a heat exchanger via a feed mechanism, not shown, which has a suitable guide line.

The pitch between adjacent spiral wings of the turbulence generating part can be independent or dependent on the extrusion speed of the Resin, the rotational speed of the nozzle 34 and the distance between the front end of the nozzle and the Surface of the water in the water tank 4 2 can be determined.

For example, if a half-pitch turbulence generating member is desired, the rotational speed may be the nozzle 34 can be doubled.

Spiral turbulence generating parts may have the shapes shown in Figures 6 (B), 7 (B) and 8 (B) can be obtained by means of the shapes of the slits shown in Figs. 6 (A), 7 (A) and 8 (A).

As described above, with the first embodiment of the present invention, it is possible to eliminate turbulence generating parts with an accurate and uniform outer diameter and wings of accurate and

jQ to produce uniform strength and pitch, whereby The advantage is that the working speed can be increased and productivity increased production costs can be reduced, and since the turbulence-generating parts are made of synthetic resin, the weight of the heat exchanger can be kept lower and the turbulence-generating pieces can easily held straight when the turbulence generating part is rolled up around a take-up reel is cut. As a result, it is not necessary to laboriously handcraft the curved ones Bend back sections of the turbulent pieces, reducing the time and labor of insertion the turbulence generating pieces in the flow path of the fluid can be reduced considerably.

A second embodiment of the device according to The invention is described with reference to FIG. In the following description, parts that are identical or identical to those of the first embodiment are identical Provided with reference numerals. In FIG. 9, 20 denotes an extrusion device in which, in use a synthetic resin is melted by heat and extruded. 22 denotes a funnel, 26 a molding head (Strand die) and 64, a cap-like rotatable nozzle having a structure similar to that of FIG rotatable nozzle in the first embodiment and

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which is freely rotatably attached to the side of the forming head 26 is.

Although the shape of the slot formed in the front end of the rotatable nozzle 64 in this embodiment is formed, is not shown in detail, it can consist of a straight opening or a radial opening Openings similar to the slot shapes of the first embodiment exist as shown in Figures 6 (A), 7 (A) and 8 (A).

This is done by means of heat inside the exbruding device Molten resin is extruded from the slot in a substantially horizontal direction while it is rotated around its main axis. The direction in which the resin is extruded can also be easily determined be inclined.

A cooling tank 82 contains water and is adjacent

2Q arranged at the front end of the nozzle 64. The container is tightly closed at its top and in a first cooling chamber 86 on the side of the nozzle 64 and in a second cooling chamber 88 on the other side divided by a partition 8 4, openings 90, 9 2 and 9 4 are in the side wall on the side of the nozzle 64, in the side wall on the other side and in the partition wall 84 of the Formed cooling container, the diameter of the openings are slightly larger than the diameter of the extruded resin and all openings aligned with the slot of the nozzle 64 in the horizontal direction are. Therefore, the resin extruded from the slot enters the first cooling chamber 86 through the opening 90, then through the opening 94 into the second cooling chamber 88 and then through the opening 92 from the cooling container 82.

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A suction pipe is designated by 100, one end of which is connected to a suitable suction pump (not shown) and the other end of which runs through the second cooling chamber 88 and occupies a higher position *

than the location of openings 90, 92 and 94, and that in that b

Space between the tightly sealed top of the second cooling chamber and the surface of the water table in the second cooling chamber 88 is open. A water supply pipe 102 is at the top of the first cooling chamber 86 connected.

That emerging from the opening 9 2 of the second cooling chamber 88 Resin is pressurized between a pair of rollers 50a and 50b and by a haul-off device 48 is withdrawn at a rate equal to the rate at which the resin is extruded from the Extruder 20 corresponds, and on a reel 52 wound.

The second embodiment of the device according to the The invention is constructed as described above.

The operation of the second device in connection with the corresponding method is described below described.

The resin melted by the action of heat within the extruder 20 is removed from the slot of the rotatable nozzle 64 is extruded substantially in the horizontal direction while it is due to its main axis the rotation of the nozzle 64 is rotated. The resin is then cooled and solidified within the cooling container 82 during successive passage through openings 90, 94 and 92, being through the Pull-off devices 48 pulled off and onto the reel 52 is wound up.

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, The resin is automatically twisted by a spiral its own rotation about the main axis between the front end of the nozzle 64 and the interior of the first cooling chamber 86 / While it is supported by the part of the resin

is that has cooled within the cooling container 82, ο

and the resin stops rotating on the haul-off device 48. The spiral shape can be unrestricted by a suitable choice of the slot shape similar to the first Embodiment (Figures 6, 7 and 8) can be determined.

Since the air present in the cooling container 82 is removed through the suction pipe 100, the space stands between the inside of the surface of the cooling tank and the surface of the water in the cooling tank each

■ ^ time under negative pressure and the water level of the water in the cooling container is located at the level of the upper end of the suction line 100, this end of the suction line is higher than the plane through openings 90 and 92, which means that the resin that passes through the Openings 90, 94 and 92 is guided, is underwater and is adequately cooled.

In this case, the negative pressure under which the above-described one is Space is held to be numerically greater than the actual pressure of the water in the plane the openings 9 0 and 9 2, so that only a little water flows out of the cooling container through the openings 90 and 9 2 can.

When through the water supply line 102 into the cooling tank 82 supplied water exceeds the level of the upper end of the suction tube 100 or air through the Openings 9 0 and 9 2 enters the interior of the cooling container 8 2, both are drawn off through the suction line, so that the space described above is kept at all times under negative pressure, the numerical value of which is greater than the previously mentioned water pressure.

Since the side wall of the first cooling chamber 86 on sides the nozzle 64 because of the low water pressure in the direction of the outside of the cooling container as a result of the negative pressure can be thin, the distance between the

front end of the nozzle 64 and the water in the first 5

Cooling chamber can be kept short so that deformation of the resin can be satisfactorily avoided,

Between - which possibly in the / space as a result of the shrinkage of the molten resin could occur.

Furthermore, the extrusion of the resin is not hindered,

when the side wall of the first cooling chamber corresponds to the front The end of the nozzle 64 as described above is obvious, since only a little water from the first cooling chamber passes through , p- the opening 90 flows out in the direction of the nozzle 64.

The pitch between adjacent screw surfaces of the turbulence generating part can be controlled by the extrusion speed of the resin, the rotation speed 2Q of the nozzle 64, the distance between the front end of the nozzle 64 and the cooling tank 82 or the like. Be determined.

The size of the negative pressure can be varied by the pulsation of the suction pump, not shown, and thereby there is a possibility that the water within the cooling tank 82 vibrates. In the present embodiment however, such vibration is effectively prevented by the presence of the partition wall 84 with the result that deformation of the resin inside the cooling container is avoided.

However, the partition can be omitted if, for example, a suction pump with low pulsation is used will.

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-Μ Since the resin is extruded in the substantially horizontal direction, cooled and solidified, and peeled off in the horizontal direction as described above, the same functions and effects as in the first embodiment can be obtained. Since the second embodiment eliminates the problem caused by the reverse feeding direction of the resin inside the cooling vessel in the first embodiment, it is possible to efficiently manufacture turbulence-generating parts with excellent accuracy.

The present invention is not limited to the first and second embodiments. Different Modifications can be made within the scope of the present invention be made. For example, the resin can travel at a relative speed that is different from the rotational speed of the nozzle / extruded out of the nozzle, while it rotates around its main axis

2Ό turns.

As described above, according to the present invention, it is possible to have turbulence generating parts with a excellent accuracy and a high working speed Manufacture by extrusion of synthetic resin, which melted under the action of heat and through the slot of the rotatable nozzle is extruded while it is twisted about its own axis, thereby the molten resin is automatically given a spiral twist and after which the molten resin is passed through water, where it is cooled and solidified. Because of this, the present one stands out Invention by good manufacturability and low Production costs. Furthermore, the weight of the turbulence-generating pieces made of plastic is lower, whereby the weight of a heat exchanger such as a radiator can be effectively reduced.

Because the turbulence-generating pieces can be easily held in a straight line even when the resin is cut after it is wound on a reel, the tedious manual labor of aligning the curved sections of the turbulence-generating pieces can be avoided, which was necessary before introducing the turbulence-inducing pieces into the flow path of the fluid in the heat exchanger. Therefore, the present invention is opposed state-of-the-art also through great time and labor savings.

Claims (5)

3H5887 MÜLLER-BOHB · DEUITEL · SCMÖH · HERTEL ETTBOPBAN PATENT ATTOHNBYS DR. WOLFGANG MÜLLER-BORE (PATENT LAWYER FROM 1927 - 1975) DR. PAUL DEUFEL, DIPL-CHEM. DR. ALFRED SCHÖN. DIPL.-CHEM. WERNER HERTEL. DIPL.-PHYS. Hl / Ot / se - M 3674 1 a NOV. 1981 Mihama Manufacturing Co., Ltd., Japan Kato Hatsujo Kaisha, Ltd. Method and apparatus for producing turbulence-generating parts from synthetic resin claims 1. A method for producing turbulence-generating parts made of synthetic resin, characterized in that that a synthetic resin melted by means of heat within an extruder through one in a rotatable nozzle the slot formed in the extrusion device is extruded, that the molten resin is rotated about its main axis, that while the molten resin is automatically provided with a spiral twist and that then the extruded Resin cools and solidifies under water. 2. The method according to claim 1, characterized in that that the molten resin perpendicularly downward through that formed in the rotatable nozzle of the extruder Slot extrudes / as it rotates about its major axis will. β MUNICH 86, SIEBERTSTR. 4 ■ POB 860720 · CABLE: MUEBOPAT ■ TEL. (089) 474005 ■ TELECOPIER XEROX 400 · TELEX 5-24285 3. The method according to claim 1, characterized in that that the molten resin is formed horizontally through that formed in the rotatable nozzle of the extruder Slot is extruded while rotating about its major axis. 4. Apparatus for producing turbulence-generating parts made of synthetic resin, characterized by a Extruding device (extruder) having an extrusion outlet for melting the resin by means of heat and for extruding the molten resin from the extrusion outlet, through a rotatable nozzle which is rotatable arranged at the extrusion outlet of the extruder and which is formed with a slit at the front end and which surrounds the molten resin its major axis can be rotated and extruded vertically down through the slot, through one with water filled water tank, which is arranged below the front end of the rotatable nozzle for cooling and Solidifying the resin extruded through the slot of the rotatable nozzle and by a haul-off device for removing the resin that has cooled and solidified in the water tank. 5. Apparatus for producing turbulence-generating parts from a synthetic resin, characterized by an extrusion device (extruder) with an extrusion outlet for melting the resin under the action of heat and extruding the molten resin from this extrusion outlet, through a rotatable nozzle which is rotatable on the extrusion outlet of the extrusion device is arranged and which is provided at the front end with a slot, with the nozzle, the molten resin to its main axis rotated andby the slot substantially horizontal direction i_ _n is extruded through a feed line to a 3U5887 -3- connected and filled with water water tank, which is provided with openings on its side walls whose diameter is slightly larger than the outer diameter of the rotatable through the slot Die extruded resin with the orifices aligned in a line so that the extruded resin pass through the openings substantially horizontally may with the top of the container sealed and with the extruded resin . cools and solidifies in the container through a suction line, one end of which is connected to a suction pump and the other end of which is opened inside the water tank, the end of the pipe lies in a plane which is higher than the plane of the openings, and through a trigger device for Removal of the resin that has cooled and solidified inside the water tank »