JP2017145525A - Thread cooling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress disturbance of a flow of a gas in a flow passage enlarged part, and to suppress flow rate variation in a flow passage width direction to be smaller.SOLUTION: A thread cooling device 3 includes: a cooling cylinder 21; and a duct 25 for supplying air to the cooling cylinder 21. The duct 25 has: a fan-shaped flow passage enlarged part 28 whose flow passage width enlarges toward the cooling cylinder 21 side; and a plurality of flow straightening plates 29 arranged radially toward the outlet side in the flow passage enlarged part 28. Each flow straightening plate 29 has a swollen part 32 at an end part on the inlet side of the flow passage enlarged part 28, and the plurality of swollen parts 32 are arranged in an arc shape swelling toward the outlet side of the flow passage enlarged part 28.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a yarn cooling device that cools a yarn spun from a spinning device.

  Conventionally, in the field of melt spinning, a yarn cooling device for cooling a yarn spun from a spinning device is known. For example, as disclosed in Patent Document 1, a general yarn cooling device includes a yarn cooling unit that cools the yarn by blowing air toward the spun yarn, and cooling air in the yarn cooling unit. It has a duct to supply.

  In the yarn cooling device as described above, in the middle of the duct, there is a portion where the flow passage width is widened (flow passage enlarged portion) on the yarn cooling portion side. Here, in the flow passage enlarged portion, the flow velocity of air is high at the central portion in the width direction, and the flow velocity is low at the end side, and a flow velocity distribution is likely to be generated. It becomes a factor causing uneven cooling. Therefore, it is desirable to make the flow velocity as uniform as possible in the width direction by rectifying the air flow in the flow path expanding portion.

  In relation to this, Patent Document 2 discloses a configuration in which a plurality of partition plates are arranged radially in a flow passage enlarged portion (enlarged duct portion) of a duct. In this configuration, the air flowing through the flow path expanding portion is rectified by the plurality of partition plates. In Patent Document 2, the ends of the plurality of partition plates on the upstream side in the flow direction are aligned in the width direction, and the positions of the plurality of ends are aligned.

  Further, Patent Document 3 discloses a configuration in which a plurality of wind direction changing members are arranged on the downstream side of the flow path expanding portion. In Patent Document 3, the upstream end portions of the plurality of wind direction changing members are respectively swelled. Further, similarly to Patent Document 2, in Patent Document 3, the positions of the ends of the plurality of wind direction changing members are aligned and aligned in the width direction.

JP 2011-252260 A JP-A-8-201215 Patent 4829002

  The above Patent Documents 2 and 3 disclose a duct provided with a member for rectifying the air flow in the flow path expanding portion, but the inlet side end of the rectifying member is aligned with the width direction of the flow path. Are lined up. However, as a result of the study by the inventors of the present application, it has been found that when the ends of the plurality of rectifying members are linearly arranged as described above, the flow tends to be turbulent and the flow velocity variation in the flow passage enlarged portion increases. .

  An object of the present invention is to suppress the turbulence of the flow in the flow path expanding portion and to further suppress the flow velocity variation in the flow path width direction.

Means for Solving the Problems and Effects of the Invention

A yarn cooling device according to a first aspect of the present invention is a yarn cooling unit that cools the yarn by blowing gas toward the yarn spun from the spinning device, a gas supply unit that supplies the gas to the yarn cooling unit, A yarn cooling device comprising:
The gas supply section includes a fan-shaped flow path expanding section in which the flow path width increases toward the yarn cooling section, and a plurality of rectifying plates arranged radially toward the outlet side in the flow path expanding section. Each rectifying plate has a bulging portion at an end portion on the inlet side of the flow passage expanding portion, and the plurality of bulging portions are arranged in an arc shape bulging toward the outlet side of the flow passage expanding portion. It is characterized by being.

  In the present invention, the gas flowing through the gas supply section flows into the yarn cooling section while spreading in the channel expansion section on the way. In the flow path enlarged portion, the gas flow is rectified by a plurality of rectifying plates arranged radially. Here, when the gas flows into the flow path expanding portion, the gas collides with the end portion on the inlet side of each rectifying plate, and the gas flow is largely separated from the rectifying plate and is easily disturbed. In this regard, in the present invention, a bulging portion is provided at an end portion of each rectifying plate on the inlet side of the flow path expanding portion. As a result, the gas flows along the surface of the bulging portion while flowing between the rectifying plates, so that the gas flow is hardly separated from the rectifying plate.

  In addition, when the bulging portions of the plurality of rectifying plates are linearly arranged in the width direction of the flow channel expanding portion, the gas flowing into the flow channel expanding portion is arranged in a row of the plurality of bulging portions arranged at a narrow interval. Since the collision occurs, the flow is likely to be disturbed. In this regard, in the present invention, the plurality of bulge portions are arranged in an arc shape that bulges toward the outlet side of the flow path expanding portion. That is, a space surrounded by a plurality of bulges is formed at the inlet of the flow path enlargement. As a result, the gas that has flowed into the flow path expanding portion once enters the space and then flows smoothly between the plurality of rectifying plates while spreading radially, so that the gas flow is less likely to be disturbed.

  According to a second aspect of the present invention, there is provided the yarn cooling device according to the first aspect, wherein a surface of the bulge portion is formed as a curved surface.

  In the present invention, since the surface of the bulging portion is formed into a curved surface, the flow of gas is likely to follow the surface of the bulging portion, and the flow is difficult to peel off from the current plate.

  The yarn cooling device according to a third aspect of the present invention is characterized in that, in the second aspect of the invention, the bulging portion has a circular cross-sectional shape.

  In the present invention, since the cross-sectional shape of the bulging portion is circular, processing is easy and advantageous in terms of cost.

  According to a fourth aspect of the present invention, there is provided the yarn cooling device according to the third aspect, wherein the bulge portion has a diameter of 5 mm to 16 mm.

  When the bulging portion is too small, the effect of suppressing peeling from the current plate is low. On the other hand, when the bulging portion is too large, the flow path resistance is increased, and it is difficult for gas to smoothly flow between the rectifying plates. From this point of view, the diameter of the bulging part is preferably 5 mm or more and 16 mm or less.

  The yarn cooling device according to a fifth aspect of the present invention is characterized in that, in the first aspect, the cross-sectional shape of the bulge portion is a triangular shape that spreads toward the outlet side of the flow passage enlarged portion.

  When the cross-sectional shape of the bulging portion is a triangular shape that widens toward the outlet side, the gas flow that collides with the end of the rectifying plate does not largely separate from the rectifying plate, and easily flows along the rectifying plate.

  According to a sixth aspect of the present invention, there is provided the yarn cooling device according to any one of the first to fifth aspects, wherein each of the two side wall portions of the fan-shaped flow passage expanding portion has an intersection of the extension lines and the plurality of bulge portions. It is characterized in that the center point of the arc in which is placed coincides.

  In the present invention, the intersection of the extension lines of the two side wall portions of the flow path expanding portion coincides with the center point of the arc where the plurality of bulge portions are arranged. For this reason, the radial streamline direction of the gas flowing so as to flow into the flow path expanding portion and the arc in which the plurality of bulge portions are arranged are orthogonal to each other, and the gas is interposed between the plurality of bulge portions. It becomes easy to flow.

  In the yarn cooling device according to a seventh aspect of the present invention, in any one of the first to sixth aspects, an angle between two adjacent rectifying plates is 6 degrees or more and 16 degrees or less. .

  If the distance between two adjacent rectifying plates is too narrow, the gas will not flow easily. If the gap between the two rectifying plates is too open, the rectifying effect will be reduced. From this viewpoint, it is preferable that the angle between two adjacent rectifying plates is 6 degrees or more and 16 degrees or less.

  The yarn cooling device according to an eighth aspect of the present invention is the invention according to any one of the first to seventh aspects, further comprising a box body in which the plurality of yarn cooling portions are accommodated, and the plurality of yarn cooling portions in the box body. Are arranged side by side in a predetermined direction, and an outlet portion of the flow path expanding portion is connected to a side portion of the box in a direction orthogonal to the predetermined direction.

  An outlet portion of the flow path expanding portion is connected to a side portion of the box body in which the plurality of yarn cooling portions are accommodated in a direction orthogonal to the arrangement direction of the yarn cooling portions. For this reason, if the flow rate variation in the width direction is large at the outlet portion of the flow path expanding portion, the cooling performance varies among the plurality of yarn cooling portions. In this regard, by adopting the configuration of the current plate of the present invention, the non-uniformity of the speed at the outlet portion of the flow path expanding portion is suppressed, so the difference in cooling performance among the plurality of yarn cooling portions is reduced Can be suppressed.

It is sectional drawing of the melt spinning apparatus which concerns on this embodiment. It is the II-II sectional view taken on the line of FIG. (A) is the III-III sectional view taken on the line expansion part of FIG. 1, (b) is an enlarged view of the swelling part of the baffle plate of (a). It is an enlarged view of the bulge part of another shape of a baffle plate. It is a figure which shows the data regarding the condition regarding the edge part (bulging part) of a baffle plate of an Example and a comparative example, and the speed variation obtained by analysis. It is a figure which shows the analysis result (velocity distribution in a flow-path expansion part) of Examples 1-3. It is a figure which shows the analysis result (velocity distribution in a flow-path expansion part) of Example 4, the comparative example 1, and the comparative example 2. FIG. It is an enlarged view of the bulging part of the baffle plate of a change form. It is sectional drawing of the flow-path enlarged part of another modification.

  Next, an embodiment of the present invention will be described. FIG. 1 is a cross-sectional view of a melt spinning apparatus according to this embodiment. 2 is a cross-sectional view taken along line II-II in FIG. In addition, the up-down direction, the front-back direction, and the left-right direction shown in FIGS. 1 and 2 are defined as the up-down direction, the front-rear direction, and the left-right direction of the melt spinning apparatus 1 of the present embodiment, respectively, and the following description is given. Proceed.

  The melt spinning apparatus 1 of this embodiment includes a spinning apparatus 2, a thread cooling apparatus 3, an oil agent guide 4, and the like. The spinning device 2 includes a spinning beam 10 and a plurality of pack housings 11 provided on the spinning beam 10. A plurality of spinning packs 12 are mounted on the plurality of pack housings 11, respectively. Note that the plurality of pack housings 11 (the plurality of spinning packs 12) are arranged in two rows in a staggered manner along the left-right direction (the direction perpendicular to the plane of FIG. 1). A molten polymer is supplied to a spinning pack 12 mounted on each pack housing 11 from a pipe or the like (not shown) provided on the spinning beam 10.

  Each spin pack 12 has a spinneret 13 formed with a plurality of nozzles at its lower end. The spinning pack 12 spins the supplied molten polymer from a plurality of nozzles of the spinneret 13. The polymer spun from a plurality of nozzles is cooled by the yarn cooling device 3 described below to become a plurality of filaments f. That is, one multifilament yarn Y composed of a plurality of filaments f is spun from one spinneret 13.

  The yarn cooling device 3 is disposed below the spinning device 2 and cools and solidifies the molten polymer spun from the plurality of spinning packs 12. As shown in FIGS. 1 and 2, the yarn cooling device 3 includes a box 20, a plurality of cooling cylinders 21 (the yarn cooling section of the present invention) housed in the box 20, and a plurality of partitioning cylinders 22. Have

  The internal space of the box 20 is partitioned vertically by a horizontal rectifying plate 23 made of a material having a rectifying function such as punching metal. A plurality of cooling cylinders 21 are arranged in the upper space of the box 20 at a position directly below the plurality of spinning packs 12. That is, as shown in FIG. 2, the plurality of cooling cylinders 21 are arranged in a staggered manner along the left-right direction according to the arrangement of the plurality of spinning packs 12. The wall of the cooling cylinder 21 is formed of a material having a rectifying function, such as punching metal, like the rectifying plate 23. On the other hand, a plurality of partitioning cylinders 22 are arranged in a lower space of the box 20 at a position directly below the plurality of cooling cylinders 21. The wall of the partition tube 22 is formed of a material that does not allow air to pass through, unlike the cooling tube 21 described above.

  The yarn Y composed of a plurality of filaments f spun from the spinning pack 12 passes through the internal space of the cooling cylinder 21 and the internal space of the partitioning cylinder 22 immediately below the spinning pack 12. On the other hand, as shown in FIG. 1, a duct 25 is connected to the rear side wall of the lower portion of the box 20. The end of the duct 25 is connected to a compressed air source (not shown) including a compressor, a humidity control device, a compressed air tank, and the like through a duct main pipe (not shown) to which a large number of ducts are connected. Air is sent as a cooling gas by the compressed air source, and this air passes through the duct 25 and is supplied into the lower space of the box 20. The structure of the duct 25 will be described later in detail.

  The cooling air flowing into the lower space of the box 20 is rectified upward while passing through the horizontal rectifying plate 23, and flows into the upper space of the box 20. Since the wall of the partition tube 22 is a wall that does not allow air to pass therethrough, air does not flow directly into the partition tube 22 from the lower space of the box 20. The air flowing into the upper space of the box body 20 is rectified when passing through the wall of the cooling cylinder 21 and flows into the cooling cylinder 21. Thereby, in the cooling cylinder 21, air is sprayed from the outer periphery of the cooling cylinder 21 with respect to the yarn Y consisting of a plurality of filaments f, and the yarn Y is cooled.

  The oil agent guide 4 is disposed at a position below the cooling cylinder 21 and the partition cylinder 22. The yarn Y cooled by the cooling cylinder 21 comes into contact with the oil agent guide 4. At this time, the oil agent guide 4 discharges the oil agent to the yarn Y and applies the oil agent to the yarn Y. The yarn Y to which the oil agent is applied by the oil agent guide 4 is taken up by a take-up roller (not shown) disposed below the oil agent guide 4. Further, the yarn Y is sent to a winding device (not shown), and is wound on a bobbin (not shown) in the winding device.

  Next, the duct 25 (corresponding to the gas supply unit of the present invention) will be described in detail. The duct 25 has a vertical flow path portion 26 extending vertically and a horizontal flow path portion 27 extending front and rear. The lower end of the vertical flow path portion 26 is connected to the aforementioned compressed air source via a duct main pipe (not shown). The horizontal flow path portion 27 extends horizontally from the upper end of the vertical flow path portion 26 and is connected to the rear side wall portion of the lower portion of the box 20. The air sent from the compressed air source flows to the box 20 through the vertical flow path portion 26 and the horizontal flow path portion 27 of the duct 25.

  3A is a cross-sectional view taken along the line III-III in FIG. 1, and FIG. 3B is an enlarged view of a bulge portion of the rectifying plate 29 in FIG. As shown in FIGS. 1 and 3 (a), the upper end of the vertical flow path portion 26 of the duct 25 has a fan-shaped flow in which the flow path width (width in the left-right direction) increases toward the upper side (cooling cylinder 21 side). A road enlargement unit 28 is provided. The two side wall portions 30 of the flow path expanding portion 28 extend obliquely with respect to the vertical direction so as to spread symmetrically with respect to the center line C. And the horizontal flow path part 27 is connected to the upper end part (exit part 28b) of this flow-path expansion part 28. FIG. That is, the flow path width of the duct 25 is widened in the flow path expanding portion 28, and the horizontal flow path portion 27 ahead of the duct 25 extends toward the box body 20 with the flow path width widened.

  The air that has flowed into the flow channel expanding portion 28 from the narrow channel portion 28a flows while spreading in the width direction toward the wide channel portion 28b. However, in the air flowing in the flow path expanding portion 28, a flow velocity distribution is generated in which the flow velocity is large in the central portion in the width direction and the flow velocity is lower toward the end side. When air having such a flow velocity distribution is supplied to the cooling cylinder 21, it causes uneven cooling of the yarn.

  In particular, in this embodiment, a plurality of cooling cylinders 21 arranged in the left-right direction are accommodated in the box 20, and the rear wall portion of this box 20 (the side in the direction orthogonal to the arrangement direction of the cooling cylinders 21). Part 25) is connected to the duct 25. Therefore, when gas flows into the box 20 in the state where the flow velocity in the width direction (left-right direction) is uneven in the air flowing in the duct 25, the air flows between the cooling cylinders 21 in the box 20. The inflow velocity of the air becomes non-uniform, resulting in a difference in yarn cooling performance. Therefore, in order to suppress nonuniform speed at the outlet portion 28b of the flow path expanding portion 28 and to reduce the difference in cooling performance among the plurality of cooling cylinders 21, the following configuration is adopted in the present embodiment. Has been.

  First, a plurality of rectifying plates 29 that rectify the air flow so that the air flowing in from the inlet portion 28a spreads evenly in the width direction are arranged in the flow path expanding portion 28. The plurality of rectifying plates 29 are arranged so as to spread radially from an inlet portion 28a having a narrow channel width toward an outlet portion 28b having a large channel width. The plurality of rectifying plates 29 are arranged at a uniform angular interval θ. If the distance between the two adjacent rectifying plates 29 is too narrow, it becomes difficult for air to flow. If the distance between the two rectifying plates 29 is too large, the rectifying effect is reduced. From this viewpoint, the angle θ between the two adjacent rectifying plates 29 is preferably 6 degrees or more and 16 degrees or less, and more preferably 8 degrees.

  Further, a bulging portion 32 is formed at the end of each rectifying plate 29 on the inlet side (upstream side in the flow direction). The width of the bulge portion 32 is larger than the portion located on the upper side (cooling cylinder 21 side) of the bulge portion 32. The surface of the bulge portion 32 is formed in a curved surface. More specifically, a round bar 31 extending in the direction perpendicular to the paper surface of FIG. 3 is attached to the end of the rectifying plate 29 on the inlet side, thereby forming a bulging portion 32 having a circular cross section.

  When the rectifying plate 29 does not have the bulging portion 32, when air flows into the flow passage expanding portion 28, the air collides with the end portion on the inlet side of the rectifying plate 29, and is largely separated from the rectifying plate 29 to be air. The flow of the becomes easy to be disturbed. In this respect, in the present embodiment, the bulging portion 32 is provided at the end of each flow rectifying plate 29 on the inlet side of the flow passage expanding portion 28, so that the air flowing into the flow passage expanding portion 28 is swollen. The air flows along the surface of the current plate 29 and flows between the current plate 29. As a result, the air flow is hardly separated from the rectifying plate 29, and the flow is less likely to be disturbed.

  Further, when the surface of the bulging portion 32 is formed into a curved surface, the air flow is likely to follow along the surface of the bulging portion 32, and the flow is difficult to peel off from the rectifying plate 29. Furthermore, if the cross-sectional shape of the bulging portion 32 is circular, processing is easy and it is advantageous in terms of cost. Specifically, the bulging portion 32 can be formed simply by attaching the round bar 31 to the plate-like member that becomes the rectifying plate 29.

  Moreover, when the bulging part 32 is too small, the effect which suppresses peeling from the baffle plate 29 is low. On the other hand, when the bulging portion 32 is too large, the flow path resistance increases, and it becomes difficult for air to flow between the rectifying plates 29. From this viewpoint, the diameter of the round bar 31 constituting the bulging portion 32 is preferably 5 mm or more and 16 mm or less, and more preferably 8 mm. The thickness of the rectifying plate 29 is, for example, about 0.5 mm.

  FIG. 4 is an enlarged view of another bulge portion 32A of the rectifying plate 29. FIG. The cross-sectional shape of the bulging portion 32A may be a triangular shape extending toward the outlet side of the flow path expanding portion 28 in FIG. 4 instead of the circular shape in FIG. If the cross-sectional shape of the bulging portion 32 is triangular, the flow of air that has collided with the end of the rectifying plate 29 is not largely separated from the rectifying plate 29, and can easily flow along the rectifying plate 29.

  By the way, when the bulging portions 32 of the plurality of rectifying plates 29 are linearly arranged in the width direction of the flow passage expanding portion 28, the air that has flowed into the flow passage expanding portion 28 is arranged at a plurality of narrow intervals. Since it collides with the row | line | column of the part 32, it becomes easy to disturb a flow. Therefore, in this embodiment, as shown in FIG. 3, the bulging portions 32 of the plurality of rectifying plates 29 are arranged along a virtual arc 35 that bulges toward the outlet side (cooling cylinder 21 side). Yes. In this configuration, a space 36 surrounded by a plurality of bulging portions 32 arranged in an arc shape is formed at the inlet portion 28 a of the flow path expanding portion 28. For this reason, the air that has flowed into the flow path expanding portion 28 once enters the space 36 and then smoothly flows into the plurality of rectifying plates 29 while spreading radially, so that the air flow is less likely to be disturbed.

  Moreover, in this embodiment, as shown in FIG. 3, the center of the circular arc 35 in which the intersection P1 of each extension line L of the two side wall parts 30 of the flow-path expansion part 28 and the some bulging part 32 are arrange | positioned. The point P2 matches. In this configuration, since the radially flowing streamline direction of the air flowing in and spreading into the flow path expanding portion 28 is orthogonal to the arc 35 in which the plurality of bulging portions 32 are arranged, the plurality of bulging portions 32. Air becomes easy to flow in between. The degree of curvature of the arc 35 depends on the shape of the flow path enlargement portion 28, but is, for example, a curvature radius R = 135 ± 5 (mm).

  The end portions on the outlet side of the plurality of rectifying plates 29 are aligned at the end position of the outlet portion 28b of the flow path expanding portion 28 and arranged on a straight line. Thereby, the flow of the air that has flowed into the flow path expanding portion 28 is reliably rectified by the plurality of rectifying plates 29 until it reaches the outlet portion 28 b of the flow path expanding portion 28.

<Verification of effect of the present invention>
Next, the effect of the example to which the present invention was applied was verified by comparing it with a comparative example. In addition, the following effect verification was performed by analyzing numerically the air flow in the flow-path expansion part 28 about each case.

(Analysis model conditions)
(1) Conditions common to all models Gas type: Number of air rectifying plates: 11 Angles between adjacent rectifying plates: 8 degrees Inlet inlet flow rate: 10.8 m ³ / min

(2) Conditions relating to the bulging portion FIG. 5 shows conditions relating to the end portion (bulging portion 32) of the rectifying plate 29 in the example and the comparative example. Note that “arc arrangement” in the “end arrangement” item of FIG. 5 indicates a form in which the ends of the plurality of rectifying plates 29 are arranged in an arc as shown in FIG. On the other hand, “straight line arrangement” indicates a form in which ends of the plurality of rectifying plates 29 are linearly arranged in the width direction.

(Verification)
6 and 7 show the analysis results (velocity distribution) for Examples 1 to 4 and Comparative Examples 1 and 2, respectively. In the “speed variation” column of FIG. 5, a value indicating the degree of variation in the speed in the width direction at the outlet portion 28 b of the flow path expanding portion 28 is described as a standard deviation. Note that the speed variation (standard deviation) in FIG. 5 is closer to 0, indicating that the variation is smaller.

  First, as shown in FIGS. 6 and 7, in Examples 1 to 4, a smooth flow is realized from the inlet portion 28a toward the outlet portion 28b. Also, the standard deviation value of the speed variation is low. On the other hand, in Comparative Example 1 in which the rectifying plate 29 does not have the bulging portion 32 and in Comparative Example 2 in which the bulging portion 32 is arranged linearly, the flow in the flow passage expanding portion 28 is disturbed and the vortex Has occurred. From this, the two features of (1) the presence of the bulging portion 32 at the end of the rectifying plate 29 and (2) the plurality of bulging portions 32 are arranged in an arc shape are the flow path expanding portions. It can be seen that it is very important in suppressing the disturbance in 28.

  Among Examples 1 to 4, in particular, in Example 1 in which the bulging part 32 is configured by an 8 mm round bar and Example 4 in which the bulging part 32 is configured by a triangular bar having a side of 8 mm, air The flow turbulence is small and the speed variation is considerably low.

  Next, modified embodiments in which various modifications are made to the embodiment will be described. However, components having the same configuration as in the above embodiment are given the same reference numerals and description thereof is omitted as appropriate.

1] In the above-described embodiment, the shape of the bulging portion of the rectifying plate 29 is shown to have a circular cross section and a triangular cross section, but is not limited to such a shape. For example, as an example in which the surface is a curved surface, there are an bulging portion 32B having an elliptical cross section as shown in FIG. 8A and a streamlined bulging portion 32C as shown in FIG. 8B.

2] The arrangement of the plurality of bulges can also be changed as follows. For example, as shown in FIG. 9, the center point P <b> 2 of the arc 35 where the plurality of bulge portions 32 are arranged may be shifted from the intersection P <b> 1 of the extension line L of the two side wall portions 30. The direction of shift of the center point P2 with respect to P1 may be shifted toward the outlet as shown in FIG. 9, but conversely, it may be shifted toward the inlet. Further, the arc in which the plurality of bulge portions 32 are arranged does not have to be an arc, and may be, for example, an elliptical arc.

3] The yarn cooling device of the embodiment includes the cooling cylinder 21 that blows air from the entire circumference as a yarn cooling unit, but the yarn cooling unit is not limited to the above. For example, a so-called cross-flow type yarn cooling unit that cools the yarn by blowing air from only one direction on the yarn may be used.

DESCRIPTION OF SYMBOLS 1 Melt spinning apparatus 2 Spinning apparatus 3 Yarn cooling apparatus 20 Box body 21 Cooling cylinder 25 Duct 28 Channel expansion part 28a Inlet part 28b Outlet part 29 Current plate 30 Side wall part 32, 32A, 32B, 32C Swelling part 35 Arc L Extension line P1 Intersection P2 Center point Y Yarn

Claims (8)

A yarn cooling device comprising: a yarn cooling unit that cools the yarn by blowing gas toward the yarn spun from the spinning device; and a gas supply unit that supplies the gas to the yarn cooling unit,
The gas supply unit
A fan-shaped flow path expanding portion that expands the flow path width toward the yarn cooling section side, and a plurality of rectifying plates arranged radially toward the outlet side in the flow path expanded section,
Each rectifying plate has a bulging portion at an end portion on the inlet side of the flow passage expanding portion,
The yarn cooling device, wherein the plurality of bulge portions are arranged in an arc shape that bulges toward an outlet side of the flow path enlargement portion.   The yarn cooling device according to claim 1, wherein a surface of the bulge portion is formed as a curved surface.   The yarn cooling device according to claim 2, wherein a cross-sectional shape of the bulge portion is circular.   The diameter of the said swelling part is 5 mm or more and 16 mm or less, The thread | yarn cooling device of Claim 3 characterized by the above-mentioned.   2. The yarn cooling device according to claim 1, wherein a cross-sectional shape of the bulge portion is a triangular shape that widens toward an outlet side of the flow path expanding portion.   The intersection of the respective extension lines of the two side wall portions of the fan-shaped flow passage expanding portion and the center point of the arc where the plurality of bulge portions are arranged coincide with each other. The yarn cooling device according to any one of the above.   The yarn cooling device according to any one of claims 1 to 6, wherein an angle between two adjacent rectifying plates is 6 degrees or more and 16 degrees or less. A box body in which a plurality of the yarn cooling sections are accommodated;
In the box, the plurality of yarn cooling units are arranged in a predetermined direction,
The yarn cooling device according to any one of claims 1 to 7, wherein an outlet portion of the flow path expanding portion is connected to a side portion of the box body in a direction orthogonal to the predetermined direction.