JP5580242B2 - Yarn heating device - Google Patents

Description

  The present invention relates to a yarn heating device for heating a yarn.

  Patent Document 1 describes a spinning winder that draws a yarn fed from a spinning section while feeding it with a godet roller and winds it with a winder. The spinning winder disclosed in Patent Document 1 is provided with an oil supply device that applies oil to a plurality of yarns spun from the spinning machine and two godet rollers. Then, a plurality of yarns spun from the spinning machine and attached with the oil agent are stretched between two godet rollers by an oil supply device.

  Patent Document 2 describes that a heating roller is used as a godet roller. The heating roller is housed in a box (insulation box) so that the heat generated by the heating roller is difficult to escape from the inside of the insulation box.

Japanese Patent Laying-Open No. 2007-77547 (FIG. 1) JP 2001-262429 A (FIG. 2)

  Here, when an oil agent is applied to the yarn as in Patent Document 1, when a godet roller is used as a heating roller as in Patent Document 2, the yarn spun from the spinning portion and attached with the oil agent is retained in the heat retaining box. When traveling inside, the oil adhering to the yarn is heated and vaporized to generate oil smoke, which may fill the heat insulation box.

  Therefore, in order to remove the smoke in the heat insulation box, it can be considered that the smoke in the heat insulation box is discharged together with air by an exhaust fan. However, in this case, when the smoke in the heat insulation box is discharged, the high-temperature air in the heat insulation box is also discharged. Furthermore, since the air in the heat insulation box is exhausted and the air pressure in the heat insulation box is lower than the outside, for example, external low-temperature air is released from an opening for inserting and removing the yarn into and from the heat insulation box. It flows in. And the temperature in a heat insulation box falls and the power consumption of the heater required in order to heat a yarn to appropriate temperature will increase.

  Accordingly, an object of the present invention is to provide a yarn heating device capable of reducing the power consumption of the heater for heating the yarn fed by the yarn feeding roller by increasing the heat insulation efficiency in the heat insulation box. It is to be.

The yarn heating device of the present invention includes a yarn feeding roller that feeds the spun yarn, a heater that heats the yarn fed by the yarn feeding roller, the yarn feeding roller, and the heater. A heat insulation box formed with an inlet and an outlet of the yarn, and the heat insulation box includes an exhaust port connected to an exhaust means for exhausting air in the heat insulation box, and an inside of the heat insulation box. And a heat exchanger that further exchanges heat between the air exhausted from the exhaust port by the exhaust means and the air flowing in from the inflow port .
The exhaust port and the inflow port are formed apart from each other, and the heat exchanger includes an exhaust pipe that connects the exhaust port and the exhaust means, and an inflow tube that is connected to the inflow port. The inflow pipe has an outer pipe extrapolated to the exhaust pipe and a branch pipe branched from the outer pipe, and the outer pipe has one end sealed, and the branch The pipe is connected to the inlet .

When the oil agent adhering to the yarn traveling in the heat insulation box is heated in the heat insulation box, the heated oil agent is vaporized to generate oil smoke. Therefore, in order to remove the smoke, the smoke is discharged together with the air from the exhaust port by the exhaust means. Then, as the air in the heat insulation box is discharged, the air pressure in the heat insulation box decreases from the outside, so that air flows into the heat insulation box from the inlet. Here, the air in the heat insulation box is heated by the heater and is at a higher temperature than the air that is about to flow into the heat insulation box. Therefore, in the yarn heating device of the present invention, heat is exchanged between the high-temperature air discharged from the exhaust port by the heat exchanger and the low-temperature air flowing in from the inflow port, and the heated air is stored in the heat insulation box. It is allowed to flow into. As a result, the temperature drop in the heat insulation box due to the exhaust means discharging the air in the heat insulation box is suppressed, the heat insulation efficiency in the heat insulation box is improved, and the heater necessary for heating the yarn to an appropriate temperature Power consumption can be reduced.
The exhaust port and the inflow port are formed apart from each other. According to this, since the discharge of air from the heat insulation box and the inflow of air into the heat insulation box are performed at a distant position, oil smoke does not diffuse due to the air flowing in from the inflow port around the exhaust port. Oil smoke can be efficiently discharged from the inside of the heat insulation box. Further, it is possible to prevent the air flowing into the heat insulation box from the inflow port from immediately flowing out from the exhaust port.
Furthermore, the heat exchanger has an exhaust pipe connecting the exhaust port and the exhaust means, and an inflow pipe connected to the inflow port, and the inflow pipe is extrapolated to the exhaust pipe. And a branch pipe branched from the outer pipe. The outer pipe is sealed at one end, and the branch pipe is connected to the inflow port. According to this, the low-temperature air flowing in the outer pipe is heated by the high-temperature air discharged from the heat insulation box and flowing in the exhaust pipe. And the air heated while flowing in the outer pipe can be caused to flow into the heat insulation box at a position away from the exhaust port via the branch pipe.

  Moreover, it is preferable that an air supply means for forcibly sending air into the heat insulation box is connected to the inflow port.

  According to this, when the air pressure in the heat insulation box decreases as the air in the heat insulation box is exhausted by the exhaust means, the heated air flows into the heat insulation box through the inlet of the heat exchanger. For example, cold air can be prevented from flowing into the heat insulation box from the entrance of the yarn without passing through the heat exchanger, and the heat insulation efficiency in the heat insulation box can be further improved.

At this time, it is preferable that the amount of air supplied to the heat insulation box by the air supply means is greater than or equal to the amount of air discharged from the heat insulation box by the exhaust means.

  According to this, since the air heated in the heat insulation box by the air supply means flows more than the amount of air exhausted from the heat insulation box by the exhaust means, the cold air without using the heat exchanger in the heat insulation box. Can be more reliably suppressed, and the heat retention efficiency in the heat insulation box can be further improved.

  The branch pipe is preferably branched from the one end of the outer pipe.

  According to this, it takes longer time for the air flowing into the outer pipe to flow through the outer pipe before flowing through the branch pipe, and the heat exchange efficiency by the heat exchanger is increased, so that the air heated to a higher temperature is put into the heat insulation box. Can flow in.

  The exhaust port may be disposed closer to the yarn outlet than to the yarn inlet.

  When the yarn travels, an air flow (associated flow) is generated around the yarn. Therefore, when the yarn enters the heat insulation box through the inlet, external cold air flows into the heat insulation box through the inlet. Further, when the yarn goes out of the heat insulation box through the outlet, the heated air in the heat insulation box flows out through the outlet. At this time, by arranging the exhaust port connected to the exhaust means closer to the outlet than the inlet of the heat insulation box, it is possible to suppress the smoke from flowing out from the outlet by the accompanying flow.

  At this time, the inlet is arranged closer to the yarn inlet than the yarn outlet, and the yarn inlet and the inlet are the yarns entered from the yarn inlet, It is formed so that the air flowing in from the inlet flows perpendicularly to the air flowing in from the inlet or in a direction inclined in the direction opposite to the running direction of the yarn entering from the yarn inlet. It is preferable.

  According to this, since air flows across the inlet from the inflow port into the heat insulation box, it is possible to block the accompanying flow generated by the traveling yarn from passing through the inlet and entering the heat insulation box. Therefore, it is possible to suppress the outside cold air from entering the heat insulation box from the entrance due to the accompanying flow, and to further improve the heat insulation efficiency in the heat insulation box.

  Moreover, it is preferable that the yarn feeding roller is a heating roller having the heater built therein.

  According to this, since the yarn wound around the yarn feed roller is directly heated, the heating efficiency of the yarn can be improved. Further, it is not necessary to provide a heater separately from the yarn feeding roller, and the configuration of the apparatus is simplified.

  Heat is exchanged between the high-temperature air discharged from the exhaust port by the heat exchanger and the low-temperature air flowing in from the inflow port, and the heated air flows into the heat insulation box. As a result, the temperature drop in the heat insulation box due to the exhaust means discharging the air in the heat insulation box is suppressed, the heat insulation efficiency in the heat insulation box is improved, and the heater necessary for heating the yarn to an appropriate temperature Power consumption can be reduced.

It is a schematic block diagram of the thread | yarn manufacturing apparatus which concerns on this embodiment. It is a perspective view of a roller unit. It is the figure which looked at the horizontal cross section of the heat retention box and the heat exchanger from upper direction.

  Hereinafter, preferred embodiments of the present invention will be described. FIG. 1 is a schematic configuration diagram of a yarn manufacturing apparatus according to the present embodiment. As shown in FIG. 1, the yarn manufacturing apparatus 1 includes a spinning machine 2, an oil supply unit 6, two roller units 3, 4 (yarn heating device), a winder 5, and the like.

  The spinning machine 2 spins down a yarn Y (so-called multifilament yarn) composed of a plurality of filaments discharged from the spinneret 2a. The oil supply unit 6 attaches an oil agent to the plurality of yarns Y that are spun from the spinning machine 2 and travel. The roller units 3 and 4 are spun from the spinning machine 2 and send the plurality of yarns Y to which the oil agent is adhered while being heated. The winder 5 winds a plurality of yarns Y stretched and fed by the roller units 3 and 4 onto a bobbin (not shown).

  Of the components of the yarn manufacturing apparatus 1 described above, the configurations of the spinning machine 2 and the winder 5 are the same as those in the prior art, so detailed description thereof will be omitted. Hereinafter, the roller units 3 and 4 will be described in detail. explain.

  The roller units 3 and 4 are disposed below the spinning machine 2. FIG. 2 is a perspective view of the roller unit. FIG. 3 is a view of the horizontal cross section of the heat insulation box and the heat exchanger as viewed from above. In FIG. 2, the roller unit 3 on the upstream side in the running direction of the yarn Y among the two roller units 3 and 4 is illustrated. Since the roller units 3 and 4 have the same structure, the structure of the roller unit 3 will be described below by taking the roller unit 3 as an example, and only the difference between the roller unit 4 and the roller unit 3 will be described. And in order to make it easy to understand which of the roller units 3 and 4 is being explained, the components of the roller unit 4 are represented by the reference numerals given to the components of the roller unit 3 with a dash (for example, A description will be given with a godet roller 11 ′, a separate roller 12 ′, and the like.

  As shown in FIGS. 1 and 2, the roller unit 3 includes a godet roller 11, a separation roller 12, a heat insulating box 13 that houses the rollers 11 and 12, and a heat exchanger 30 provided outside the heat insulating box 13. doing. The heat insulating box 13 is a rectangular parallelepiped box made of a heat insulating material. The heat retaining box 13 is provided with a door 13a that can be opened and closed.

  A godet roller 11 and a separate roller 12 are accommodated in the heat insulating box 13. The godet roller 11 is a driving roller that is disposed on the side opposite to the door 13 a of the heat retaining box 13 and is cantilevered by a frame (not shown), and takes up a plurality of yarns Y sent from the spinning machine 2. The godet roller 11 rotates when driven by a drive motor (not shown), and sends a plurality of wound yarns Y to the downstream side in the traveling direction.

  The separate roller 12 is disposed above the godet roller 11, and is a driven roller that is cantilevered on a frame (not shown) disposed on the side opposite to the door 13 a of the heat retaining box 13, similar to the godet roller 11. The plurality of yarns Y taken up by the godet roller 11 are wound several times between the godet roller 11 and the separate roller 12 at a predetermined pitch so as not to overlap each other.

  Then, when the godet roller 11 rotates and the plurality of yarns Y travel, the separation roller 12 around which the yarns Y are wound also rotates. The plurality of yarns Y sent from the separate roller 12 are sent to the roller unit 4 on the downstream side in the traveling direction.

  The godet roller 11 is a heating roller having a built-in heater 15 (see FIG. 2), and the yarn Y is heated while being wound and fed between the godet roller 11 and the separation roller 12. And the godet roller 11 and the separation roller 12 are arrange | positioned in the heat insulation box 13, and the heat generated by the heater 15 is prevented from escaping out of the heat insulation box 13 by closing the door 13a. The separation roller 12 may be a driving roller as well as the godet roller 11 or may be a heating roller.

  The upper wall 23 of the heat insulation box 13 has two slits 24a, 24b (an inlet for the yarn, a yarn inlet) extending substantially parallel to the direction in which the plurality of yarns Y are arranged on both sides of the rollers 11, 12. Outlet) is formed. The slit 24a is open at the end on the door 13a side (opening / closing opening side of the heat insulation box 13) in order to insert the yarn Y from the front surface when threading the rollers 11 and 12. The slit 24 a serves as an entrance for putting the yarn Y into the heat insulation box 13 when winding the yarn around the winder 5.

  Similarly to the slit 24a, the slit 24b is open at the end on the door 13a side in order to insert the yarn Y from the front surface when threading the rollers 11 and 12. The slit 24 b serves as an outlet for taking out the yarn Y from the inside of the heat insulating box 13 when winding the yarn around the winder 5.

  The openings of the slits 24a and 24b are blocked by the door 13a when the door 13a is closed.

  Further, on the side wall 26 opposite to the door 13a of the heat insulating box 13, there are an inlet 27 and an outlet 28 on both sides of the rollers 11 and 12 and immediately below the slits 24a and 24b. Is formed. The inflow port 27 has a rectangular shape, and the exhaust port 28 has a circular shape.

  As shown in FIGS. 2 and 3, the heat exchanger 30 includes, for example, an inner tube 31 made of a metal material having good heat transfer efficiency such as copper or aluminum, and an outer tube 32 that is extrapolated to the inner tube 31. A double pipe 33 and a branch pipe 34 branched from the outer pipe 32 are provided. The inner pipe 31 has one end connected to the exhaust fan 40 (exhaust means) and the other end connected to the exhaust port 28. One end of the outer tube 32 is connected to the intake fan 41 (air supply means), and the other end is sealed. The branch pipe 34 branches off from the end side of the outer pipe 32 and is connected to the inflow port 27. The outer tube 32 and the branch tube 34 are wound around the outer periphery with a heat insulating material (not shown). Note that the suction fan 41 can also be provided in the vicinity of the connecting portion between the branch pipe 34 and the heat insulating box 13 (portion indicated by a one-dot chain line portion in FIG. 3).

  When the exhaust fan 40 is driven, the air in the heat insulation box 13 is exhausted through the inner pipe 31. When the intake fan 41 is driven, external air passes through the outer pipe 32 and then flows into the heat insulation box 13 through the branch pipe 34. At this time, in the heat exchanger 30, the air passing through the inner pipe 31 and the air passing through the outer pipe 32 are counterflows that flow in opposite directions, and heat exchange is performed between the air flowing in these two directions. Done. Thereby, compared with the case of a parallel flow, the heat transfer efficiency is high. Note that the amount of air supplied to the heat insulation box 13 by the intake fan 41 is set to be greater than the amount of air discharged from the heat insulation box 13 by the exhaust fan 40. Preferably, the air supply amount and the exhaust amount are the same. The air supply amount and the exhaust amount of the intake fan 41 and the exhaust fan 40 can be set to a desired air flow rate by adjusting the fan drive motor capacity, the diameter of the pipe, the opening / closing amount of the valve, and the like.

  The roller unit 4 is arranged in a posture that is upside down with respect to the roller unit 3. The roller units 3 and 4 have different rotational speeds of the godet roller 11 as will be described later.

  In the yarn manufacturing apparatus 1 having the above-described configuration, after a plurality of yarns Y spun from the spinning machine 2 are attached with the oil agent by the oil supply unit 6, first, the side opposite to the opening of the slit 24a ( It passes through the vicinity of the end on the back side of FIG. 1 and enters the heat insulating box 13 and is taken up by the godet roller 11 of the roller unit 3.

  Then, the yarn Y taken up by the godet roller 11 in the heat insulation box 13 is wound a plurality of times between the godet roller 11 and the separation roller 12, and then leaves the godet roller 11 and passes through the vicinity of the opening of the slit 24b. Out of the heat insulation box 13, enters the heat insulation box 13 ′ through the vicinity of the end opposite to the opening of the slit 24 a ′ (the back side in FIG. 1), and is sent to the godet roller 11 ′ of the roller unit 4. .

  After that, the yarn Y taken up by the godet roller 11 ′ in the heat insulation box 13 is wound a plurality of times between the godet roller 11 ′ and the separate roller 12 ′, and then separated from the godet roller 11 ′ and is separated from the slit 24b ′. It passes through the vicinity of the opening, exits the heat insulation box 13 ′, and is sent to the winder 5.

  Thereby, the yarn Y travels from the spinning machine 2 toward the winder 5 at a speed of, for example, about 4000 to 6000 m / min. At this time, the yarn Y is fed while being heated between the heating rollers 11 and 12 incorporating the heater 15 and between the heating rollers 11 ′ and 12 ′ incorporating the heater 15. Further, the godet roller 11 ′ of the roller unit 4 has a higher rotational speed than the godet roller 11 of the roller unit 3, and the heated yarn Y is rotated between the godet roller 11 and the godet roller 11 ′. The film is stretched with a force corresponding to the difference.

  Here, when the oil agent is heated together with the yarn Y in the heat insulation box 13, a part of the oil agent adhering to the yarn Y is vaporized and oil smoke is generated in the heat insulation box 13. Then, in order to remove the smoke generated in the heat insulation box 13, the air is exhausted from the exhaust port 28. At this time, the hot air in the heat insulation box 13 is also discharged together with the smoke. And the air in the heat insulation box 13 is discharged | emitted, and the atmospheric | air pressure in the heat insulation box 13 falls from the outside, and external low temperature air will flow in into the heat insulation box 13 from the slit 24a or a clearance gap. And the temperature in the heat insulation box 13 will fall.

  Therefore, in the present embodiment, by providing the heat exchanger 30, high-temperature air (for example, 100 degrees) discharged from the heat insulation box 13 together with smoke, and external low-temperature air flowing into the heat insulation box 13 Heat exchange is performed with (for example, 30 degrees), and heated air (for example, 60 degrees) is caused to flow into the heat insulation box 13. Thereby, the temperature fall in the heat insulation box 13 by discharging the air in the heat insulation box 13 by the exhaust fan 40 is suppressed, the heat insulation efficiency in the heat insulation box 13 is improved, and the yarn Y is heated to an appropriate temperature. Therefore, the power consumption of the heater 15 necessary for this can be reduced.

  In addition, the air heated by the heat exchanger 30 rather than the slits 24a and 24b and the gaps of the heat insulation box 13 is preferentially caused to flow in by introducing air from the inlet 27 into the heat insulation box 13 by the intake fan 41. be able to. At this time, since the air heated by the intake fan 41 into the heat insulation box 13 flows more than the amount of air discharged from the heat insulation box 13 by the exhaust fan 40, the heat exchanger 30 is interposed in the heat insulation box 13. Therefore, it is possible to suppress low-temperature air from flowing in, and to further improve the heat insulation efficiency in the heat insulation box 13.

  Further, since the exhaust port 28 is provided immediately below the slit 24b for the yarn Y to come out of the heat insulating box 13, the smoke flows out to the outside by the accompanying flow generated by the running of the yarn Y from the slit 24b. Can be suppressed. Furthermore, since the inflow port 27 is provided immediately below the slit 24 a for inserting the yarn Y into the heat insulation box 13, the inflow of air into the heat insulation box 13 is performed at a position away from the exhaust port 28. Therefore, smoke is not diffused by the air flowing from the inlet 27 around the exhaust port 28, and the smoke can be efficiently discharged from the heat insulating box 13. Further, it is possible to prevent the air flowing into the heat insulation box 13 from flowing out from the exhaust port 28 immediately. In addition, since the branch pipe 34 is branched from the side wall 26 of the outer pipe 32, the time that the air flowing into the outer pipe 32 flows through the outer pipe 32 before flowing through the branch pipe 34 is increased. The heat exchange efficiency by the heat exchanger 30 can be increased, and air heated to a higher temperature can be caused to flow into the heat insulation box 13.

  Further, since air flows from the inlet 27 into the heat insulation box 13 across the slit 24a, the accompanying flow generated by the traveling yarn Y is blocked from passing through the slit 24a and entering the heat insulation box 13. be able to. Therefore, it is possible to suppress the external low-temperature air from entering the heat insulation box 13 from the slit 24a by the accompanying flow, and to further improve the heat insulation efficiency in the heat insulation box 13. The slit 24a and the inflow port 27 are formed so that the yarn Y entering from the slit 24a and the air flowing in from the inflow port 27 are orthogonal to each other, and preferably the yarn entering the heat insulation box 13 from the slit 24a. If the air flowing in from the inflow port 27 flows in a direction inclined in the direction opposite to the Y traveling direction, the accompanying flow can be more effectively suppressed.

  Furthermore, since the godet roller 11 is a heating roller incorporating the heater 15, the yarn Y wound around the godet roller 11 is directly heated, so that the heating efficiency of the yarn Y can be improved, and this heating is performed. It is not necessary to provide the heater 15 separately from the godet roller 11, and the configuration of the roller units 3 and 4 is simplified.

  Next, modified examples in which various changes are made to the present embodiment will be described. However, components having the same configuration as in the present embodiment are denoted by the same reference numerals, and description thereof is omitted as appropriate.

  In the present embodiment, the rollers 11 and 12 of the roller unit 3 and the rollers 11 ′ and 12 ′ of the roller unit 4 are accommodated in different heat insulating boxes 13 and 13 ′. It may be accommodated. For example, it is called a so-called single-hanging type, a plurality of heating rollers are arranged in a staggered manner, the winding angle around each heating roller is set to 360 degrees or less, and the yarn Y is hung in order from the upstream heating roller. The present invention can also be applied to a configuration for traveling.

  In the present embodiment, the cross-sectional shape of the inner tube 31 of the double tube 33 of the heat exchanger 30 is circular, but the inner tube 231 of the heat exchanger 230 may have any shape, and heat transfer Any shape that increases the area and increases the heat exchange efficiency may be used.

  Furthermore, in this embodiment, although the double pipe 33 was used as a heat exchanger, you may use a conventionally well-known various heat exchanger. For example, a plate-type heat exchanger in which a plurality of plates are stacked, a flow path is formed between the plates, and a flow path for alternately flowing a cooling medium and a heating medium in the stacking direction of the plates is formed. Good.

  In the present embodiment, the yarn Y is wound a plurality of times between the godet roller 11 and the separation roller 12. However, the yarn Y is wound a plurality of times only on the godet roller 11 without providing the separation roller 12. May be.

  Further, in the present embodiment, the inner pipe 31 is connected to the exhaust fan 40, the outer pipe 32 is connected to the intake fan 41, hot air exhausted from the inner pipe 31 flows, and the outer pipe 32 and Although the low temperature air flowing into the branch pipe 34 was flowing, the inner pipe 31 was connected to the intake fan 41, the outer pipe 32 was connected to the exhaust fan 40, and the high temperature exhausted from the outer pipe 32 and the branch pipe 34 was high. As air flows, low-temperature air flowing into the inner pipe 31 may flow.

  Further, in the present embodiment, the present invention is applied to the yarn manufacturing apparatus 1 that is applied to a multifilament yarn composed of a plurality of filaments, heated and stretched, and then wound around the winder 5, but the oil agent is applied to the monofilament yarn. The present invention may be applied to a yarn manufacturing apparatus that is wound around the winder 5 after being attached with heat. Further, not only multifilament yarns and monofilament yarns, but also in a yarn production apparatus that is wound around a winder 5 after being heated and stretched without attaching an oil agent to the yarn Y, it is included in the spun yarn Y. The present invention may be applied because there is a fear that impurities are vaporized to generate smoke.

  Further, in the present embodiment, the number of the exhaust ports 28 and the inflow ports 27 is one, but a plurality may be used. And the position which provides the exhaust port 28 and the inflow port 27 may be arbitrary positions. For example, an exhaust port may be provided immediately below the slit 24b at the exit of the yarn Y and provided near the heated godet roller 11 where oil smoke is likely to be generated.

  In the present embodiment, air is forced to flow in from the inlet 27 by the intake fan 41, but one end of the outer pipe 32 may be open to the atmosphere without being connected to the intake fan 41. Even in this case, since air is discharged from the heat insulation box 13 through the exhaust port 28, the air pressure in the heat insulation box 13 is lower than the outside, so that air flows in from the inlet 27 through the outer tube 32. Is done. One end of the outer tube 32 may be connected to a pressure source such as a pressure pump.

  Furthermore, in the present embodiment, the intake fan 41 is connected to the end of the outer pipe 32, but it may be provided in any of the outer pipe 32, the branch pipe 34, and the inflow port 27.

  Further, in the present embodiment, the example in which the present invention is applied to the roller unit provided with the godet roller and the separate roller in the heat insulation box for stretching the yarn Y while being heated has been described. It is also possible to apply the present invention to another yarn heating device provided with a heating roller for heating and sending the yarn in the heat insulating box.

DESCRIPTION OF SYMBOLS 1 Yarn manufacturing apparatus 3, 4 Roller unit 11 Godet roller 12 Separate roller 13 Insulation box 15 Heater 27 Inflow port 28 Exhaust port 30 Heat exchanger Y Yarn

Claims (7)

A yarn feed roller for feeding the spun yarn,
A heater for heating the yarn fed by the yarn feeding roller;
The yarn feeding roller and the heater are housed, and a heat insulation box in which an inlet and an outlet of the yarn are formed, and
The heat insulation box is further formed with an exhaust port connected to an exhaust means for discharging the air in the heat insulation box, and an inlet for allowing air to flow into the heat insulation box,
A heat exchanger for exchanging heat between the air discharged from the exhaust port by the exhaust means and the air flowing in from the inflow port ;
The exhaust port and the inflow port are formed apart from each other,
The heat exchanger has an exhaust pipe connecting the exhaust port and the exhaust means, and an inflow pipe connected to the inflow port,
The inflow pipe has an outer pipe extrapolated to the exhaust pipe, and a branch pipe branched from the outer pipe,
The outer tube is sealed at one end,
The yarn heating device , wherein the branch pipe is connected to the inlet .   The yarn heating device according to claim 1, wherein an air supply means for forcibly sending air into the heat insulation box is connected to the inlet.   The yarn heating device according to claim 2, wherein the amount of air supplied to the heat insulation box by the air supply means is equal to or greater than the amount of air discharged from the heat insulation box by the exhaust means. The yarn heating device according to any one of claims 1 to 3, wherein the branch pipe is branched from the one end of the outer pipe. The yarn heating device according to any one of claims 1 to 4 , wherein the exhaust port is disposed closer to an exit of the yarn than an entrance of the yarn. The inflow port is disposed closer to the yarn inlet than the yarn outlet;
The yarn entrance and the inflow port are arranged so that the yarn entering from the yarn entrance and the air flowing in from the inflow port are orthogonal to each other, or the yarn entering from the yarn entrance 6. The yarn heating device according to claim 5 , wherein the yarn heating device is formed so that air flowing in from the inflow port flows in a direction inclined in a direction opposite to the direction. The yarn heating device according to any one of claims 1 to 6 , wherein the yarn feeding roller is a heating roller incorporating the heater.

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