DE1660629A1 - Device for heating plastic threads - Google Patents

Description

Description of the patent application

of the Sulzer brothers, heating and ventilation GmbH, Stuttgart / German »

IaITd "

concerning:

"Device for heating up plastic threads"

The invention relates to a device for heating plastic threads in a false twisting machine.

Heating devices in textile machines for crimped yarn, in so-called false twisting machines, are known. In general u / ground these heating devices in which the plastic thread heated to a certain temperature when passing through and at this temperature for a certain time, at which it becomes plastic, must be kept, electrically heated. Difficulties often arise, especially when it comes to the throughput speed of the thread is relatively large. These difficulties are due to the fact that it is difficult to achieve the relative • Fast running thread during the necessary time to maintain the required temperature, e.g. at around 200 ° C,

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without the length of the heating device in the direction of the thread inadmissibly large. The cause of these difficulties lies in the v / on of the point or the area of highest temperature outgoing, relatively strong temperature drop to the thread inlet and the thread outlet of the heating device there·

The invention is based on the object, even in machines where the Durchlaufgeschaindigkeit of the yarn by the heating means is relatively high to achieve _y a sufficiently high and uniform heating of the filament during a sufficiently long period · The invention is characterized in that a plurality of frame-like , Cells through which a heat transfer medium flows with the lower and / or upper ends of their frame transverse sides via connections each containing a throttle point to a common distribution or heating element that connects the cells to form a radiator. Collecting line for the heat transfer medium are connected, and that the two longitudinal sides of the cells running in the direction of the thread are designed as double pipes, in the space between which the heat transfer medium flows and a thread runs through each of the interior spaces.

In an advantageous embodiment for the frame-like Cells are the transverse sides of the cells as horizontal, protruding beyond the long sides, closed at both ends Connecting pipe pieces are formed, and furthermore, the outer pipes of the double pipes are on the inside of the frame Surfaces are welded to the connecting pipe pieces, while the inner pipes of the double pipes are the connecting pipe pieces penetrate and welded to their outer frame surfaces are.

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The particular advantage of this design is that it creates dead spaces in which there is contamination, air or water? could accumulate, avoided · By this The structure also ensures that the impurities can easily escape when the heating device is flushed through, and that when the system is filled with heat transfer medium, neither water nor air collects.

Furthermore, it is expedient to surround each radiator made up of several cells with its own insulation and via his assigned distribution board. Manifold in the Fasten textile machine.

In general, a number of heating elements are arranged in a textile machine, each of which has, for example, 8 to 10 cells contains, so heated about 16 to 20 threads. It is therefore essential for the uniform heating of all threads in a machine advantageous if the radiator of this machine becomes a Group are united in which a circulation of the heat transfer medium is maintained by its own conveying device, where the flow temperature of the heat transfer medium is caused by the admixture of the return flow can be regulated individually for each group.

Further features of the invention emerge from the following description of a shown in the drawing Embodiment ·

FIG. 1 shows the structure in a section I-I of FIG a cell perpendicular to the frame plane of the cell;

Fig. 2 is section II-II of Fig. 1 and illustrates one multiple cells as a radiator, while

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3 schematically shows the structure of the radiator group of two machines with the associated conveyor system for reproduces the heat transfer medium "

De amei threads 1 pass through a cell 2 (Fig. 1) from above down · Since when the threads 1 are heated up, these binders are deposited, which are in the cooler areas the heating device, so in the vicinity of the thread inlet and the thread outlet, reflected, each thread 1 is known Way initially surrounded by an insert tube 3 which is inserted into the inner tubes 4 of the double tubes designed according to the invention is inserted. The insert tubes 3 consist, for example, of aluminum. They are to be fitted into the inner tubes 4 so that During the heating and expansion, a good heat-conducting connection with the inner wall of the tubes 4 results. The tubes 3 are replaced at certain time intervals when they are dirty.

The inner tubes 4 are at a certain distance from the Surrounding outer tubes 5 so that a heat transfer medium, e.g. a synthetic high-temperature oil, can circulate between the two Selection of d8s oil depends on the desired heating temperature Since its evaporation point must be above this temperature, it is expedient to choose oils with their evaporation temperatures range from 330 to 350 ° C at atmospheric pressure. Since the Ufärmeinhalt of the oils continues to the specific Weight and the specific heat is proportional, it is favorable if the invoice value is specific poem times specific heat is high so that only a small amount of oil has to be kept in circulation.

The two double pipes 4, 5 are closed at their upper and lower ends by a connecting pipe 6 and 7 each

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the .frame-like cell 2 with each other, connected, the Outer tubes 5 according to the invention with the frame inside Surfaces and the inner tubes with the surfaces on the outside of the frame the connecting pipes 6 and 7 are welded. Furthermore, according to the invention, the connecting pipe pieces 6 and 7 protrude Outer tubes 5 on both sides in the horizontal direction and are closed at their ends by end caps 8

Open in the middle between the two double tubes 4, 5 into the connecting pipes 6 and 7 at their deepest bzuu its highest point 9 bzuu 10 pieces of pipe 11, which the cell to the distribution line 12 and the collecting line 13 for the Connect the heat transfer medium «

The formation of the connecting pipes 6 and 7 with horizontal ends, their described connection according to the invention with the double pipes 4, 5 and the arrangement of the junctions of the pipe sections 11 at the highest or lowest point of the connecting pipes 6 and 7 serve the special task of avoiding dead spaces in the system in which the air transfer oil circulates » in which, even after the system has been filled with the heat transfer medium, impurities, such as air or air, can be deposited « Due to the arrangement according to the invention, in which there are no pockets and troughs, the mentioned Fredistoffe, the uniform circulation of the primary carrier and one interfere with the same high heat transfer from the heat transfer medium to the pipe sections or cause steam hammer when filling the system by ascending from the bottom to the top as far as possible, all Oil reaching nooks and crannies is washed out} because at the transition from a horizontal to a vertical part the cell 2 and to the distribution or »collecting line 12 and 13

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it is guaranteed that the transition point is always in the highest bzui. lowest point of the horizontal parts is

The tube pieces 11, which are constructed as throttle tubes but also may consist of tubes further diameter with built-in choke points, the object of providing a uniform distribution have to ensure the Uiärmeträgers to the individual cells 2 of a radiator 14 (Fig. 2), without the need for special ragging organs are necessary. The high flow resistance of the pipe sections 11 ensures that there is equal pressure at all branches to the individual cells 2 of a heater 14 in the distribution line 12 and in the collecting line 13.

As can be seen from FIG. 2, the distribution line 12 consists and the manifold 13 of the entire length of the radiator extending, horizontal pipes, which at one end are closed with a cap, while at the other end, the connecting lines 15 and 16 open out to the for the entire machine lead common flow and return line system 18, 19 (Fig. 3). The lines 15 and 16, which act as throttle tubes are designed for the heating element 14, are eccentric to the distribution to avoid any dead spaces or «collecting line 12 or 13 connected ·

The entire radiator 14 consists of several, connected to the same distribution or collecting line, in pairs pooled cells 2 and is shared with a high quality Insulation 17, e.g. made of fflineral wave, enclosed The collecting line 13, which is partially embedded in its own insulation layer, can be added to this by means of brackets (not shown) serve the individual radiator 14 in the textile machine

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to be attached, then on the distribution line 12 as well Guide elements, not shown, are provided which pendulum prevent the suspended radiator 14 in the textile machine.

The scheme of Fig. 3 shows an example of how several, For example, all radiators 14 belonging to two textile machines are combined into a group and connected to the main line system 26, 27, in which a heat source (not shown) is arranged, can be connected «

Each radiator group forms a closed circulation system for the Ufärmeträgeröl, which circulates from the feed pump 20 through the flow line 18, the individual radiators 14, the return line 19 and the branch line 23 provided with a non-return valve 22 leading to an I-tube 21 located in the flow line 18 _o The delivery pressure in this system is, depending on the extent of the system, for example about 5 to 8 atmospheres. The temperature of the flow 18 is held by a temperature sensor 24, at which a target value can be set, for example at a temperature of 220 ° C, such that a relatively small portion of the return line 19 via a control valve 25 influenced by the temperature sensor 24 leads away from the fflmachine circuit and fed into the main return line 26 leading to a heat source (not shown), for example a boiler, while at the same time the equally large partial amount from the flow line

27 with a temperature of about 280 - 290 ° C through a filter

28 and the mixing tube 21 is newly fed to the belt machine circuit. The control valve 25 in the return line 19 is from a bypass line provided with a manual control valve 30 bridged, so that the system in the event of malfunctions or failure of the Control can also be kept at the desired temperature by hand

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can be. Another bypass line 32 with the closing element 33 can short-circuit the filter 28 in order to enable it to be cleaned from time to time during operation

A commercially available centrifugal pump with a mechanical seal is particularly suitable as the feed pump 20, since these pumps have very low leakage losses. A bi-metal element, for example, can serve as temperature sensor 24. Used for regulation Electro-pneumatically controlled organs are advantageous, since these take effect relatively quickly, i.e. without a large control delay will.

The circulation system of the machine circuit, without the Connections 18 and partly 19 to the main lines 26, 27 is designed so that the amount of oil circulated per unit of time about 20 times the Klenge supplied or discharged from the supply network 27, 26. Furthermore, the temperatures of the thermal transfer oil at the system inlet and at the system outlet do not differ from each other by more than 2 ° C.

As already mentioned, the selection of the heat transfer medium depends on the maximum temperature to be reached. Both the heating element 14 as well as all related supply and discharge pipes are to be made in accordance with temperature-resistant tubes, for example, to be used for temperatures below 300 ⁰ C tubes made of St. 35.29 and from 300 ° C to 400 ° C tubes made of St. 35.8 .

The structure according to the invention of the radiator 14 from individual frame-like cells 2, which are designed as double tubes 4, 5 in their parts through which the threads 1 pass furthermore, with a relatively small amount of heat- '

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lazy »Furthermore, the long path that the threads 1 in the between the connecting tubes 6. and 7
_{lying t} double tubes 4, 5, which are kept at almost the same temperature over their entire length, "a uniform temperature of the threads 1 over a long distance, which could not be achieved with previous arrangements"
By installing the throttle pipes 11 between the lines 12 or 13 and the connecting pipes 6 bzui. 7 is a guarantee
for even pressure distribution in the l / grant and
Collectors 12 and 13 given, which ensures that the individual cells 2 are subjected to the same amount of heat without any special regulating devices being provided
Need to become.

- patent claims -

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Claims (5)

- ίο - claims 1. Device for heating plastic threads in one False twisting machine, characterized in that several frame-like, Cells (2) through which a heat transfer medium flows with the lower (9) or upper (10) ends of their frame transverse bits (6,7) Via connections (11) each containing a throttle point to a common connection connecting the cells (2) to form a heating element (14) l / grant (12) or collecting line (13) for the heat transfer medium are connected, and that the two longitudinal sides of the rows (2) running in the direction of the thread are double tubes (4,5) are formed, through the space between which the heat transfer medium flows and a thread (1) runs. 2. Device according to claim 1, characterized in that that the transverse sides (6,7) of the cells (2) as horizontal, protruding beyond the longitudinal sides (5), closed at both ends Connecting pipe pieces are formed, and that the outer pipes (5) of the double pipes (4,5) on the inside of the frame Surfaces with the connecting pipe pieces (6,7) are welded, while the inner pipes (4) of the double pipes (4,5) the connecting pipe pieces (6,7) penetrate and are welded to the surfaces on the outside of the frame 3. Device according to claim 1, characterized in that that each radiator (14) is enclosed by its own insulation (17) -11- ORIGINAL INSPECTED 109835/1202 4. Device according to claim 1, characterized in that » that the heating element (14) to at least one textile machine a group are united in which a circulation of the Ufärmsträgers is maintained by its own conveyor device (20) doing. 5. Device according to claim 4, characterized in) that the flow temperature of the Ulärmeträger by return admixture can be individually regulated for each group « 109835/1202 Blank page