JP2011252260A - Yarn cooling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To evenly cool yarn which is spun from a spin beam.SOLUTION: A yarn cooling device comprises a cooling air supply box 22 in which a cooling-cylinder housing chamber 41, an upper side connection channel 42, a lower side connection channel 43 and others are formed. The cooling-cylinder housing chamber 41 stores a plurality of cooling cylinders 21 such that they face a plurality of spinnerets 13 of a spin beam 2. The plurality of cooling cylinders 21 are arranged zigzag in two lines in a left to right direction. Also, the cooling-cylinder housing chamber 41 is provided with a first connection port 45 and a second connection port 46 at lower end parts of side wall surfaces 41a and 41b, respectively. To the first connection port 45, the upper side connection channel 42, which is connected to a duct 60 and elongated in a left to right direction, is connected. To the second connection port 46, the lower side connection channel 43, which is disposed below the upper connection channel 42, connected to the duct 60, and elongated such that it passes around below the cooling-cylinder housing chamber 41, is connected.

Description

  The present invention relates to a yarn cooling device for cooling a yarn spun from a spinning beam for spinning molten material as a yarn from a die.

  In the melt spinning apparatus described in Patent Document 1, the spinning beam spins the melted material as a thread from a plurality of bases. Below the spinning beam, a plurality of cooling cylinders are arranged at portions facing the plurality of bases. Here, the plurality of cooling cylinders are arranged in a staggered pattern in one row or two rows in the internal space (cooling cylinder housing chamber) of the cooling air supply box in accordance with the arrangement of the caps. In addition, a duct is connected to the rear end portion of the internal space of the cooling air supply box, and the cooling air supplied from the duct to the internal space of the cooling air supply box is rectified in a filter that forms a cooling cylinder. Above, it flows into the space (yarn running space) in which the yarn spun from the spinning beam is formed inside the cooling cylinder. Then, the yarn traveling in the yarn traveling space is cooled by the cooling air.

Japanese Patent No. 3868404

  However, in the melt spinning apparatus described in Patent Document 1, cooling air is supplied from a duct connected to the rear end of the cooling cylinder housing chamber, that is, the internal space of the cooling air supply box is cooled only from the rear. Since the wind flows, the amount of cooling air that flows around the cooling cylinder and flows into the yarn traveling space from the front is smaller than the amount of cooling air that flows into the yarn traveling space from behind without flowing around the cooling cylinder, Variations in the amount of cooling air flowing into the yarn traveling space occur. In particular, when the cooling cylinders are arranged in two rows in a staggered manner, the cooling air is unlikely to flow in front of the cooling cylinders constituting the front row far from the duct, and the cooling air flowing into the yarn traveling space Variations in air volume are likely to occur. If the air flow of the cooling air flowing into the yarn running space varies, the yarn running in the yarn running space is not cooled evenly, and the yarn quality is uneven. There is a risk of lowering.

  An object of the present invention is to provide a yarn cooling device capable of uniformly cooling a yarn spun from a spinning beam.

  A yarn cooling device according to a first aspect of the present invention is a yarn cooling device that cools a yarn spun from a spinning beam that is spun downward from a plurality of bases as a yarn from a plurality of caps, and the spinning beam Is arranged so as to face the plurality of bases, and the inside thereof is a yarn traveling space extending in the vertical direction in which the spun yarn travels, and the yarn traveling space. A plurality of cooling cylinders, and a cooling air supply box for supplying cooling air to the yarn traveling space of the plurality of cooling cylinders. The cooling air supply box is supplied with cooling air inside the cooling tube housing chamber in which the plurality of cooling tubes are housed, and on one side of the cooling tube housing chamber as viewed from above and below. For connecting the duct for cooling and the cooling cylinder housing chamber A path is formed, and the cooling cylinder housing chamber has a first side wall for connection with the connection flow path on the side wall surface on the duct side and the side wall surface on the side opposite to the duct, respectively. A connection port and a second connection port are formed, the connection channel is disposed below the upper connection channel and the upper connection channel that connects the first connection port and the duct, The lower connection flow path is connected to the duct and extends so as to wrap around the lower part of the cooling cylinder housing chamber and connected to the second connection port.

  According to the present invention, the cooling air supplied from the duct flows into the cooling cylinder storage chamber from both sides via the upper connection flow path and the lower connection flow path. Cooling air flows evenly from the entire circumference, and the yarn traveling in the yarn traveling space can be evenly cooled.

  A yarn cooling device according to a second invention is the yarn cooling device according to the first invention, wherein the yarn cooling device is arranged at the first connection port and flows into the cooling cylinder housing chamber from the upper connection flow path. A first punching plate that rectifies the air and a second punching plate that is disposed in the second connection port and rectifies the cooling air flowing into the cooling cylinder housing chamber from the lower connection flow path, The aperture ratio of the second punching plate is greater than or equal to the aperture ratio of the first punching plate.

  The lower connection flow path extends below the cooling cylinder housing chamber and is longer than the upper connection flow path, so that cooling in the vicinity of the second connection port of the lower connection flow path is performed. The air volume of the air is smaller than the air volume of the cooling air in the vicinity of the first connection port of the upper connection channel.

  However, according to the present invention, since the aperture ratio of the second punching plate is equal to or greater than the aperture ratio of the first punching plate, the cooling air is evenly supplied to the cooling cylinder housing chamber from both sides.

  A yarn cooling device according to a third aspect of the invention is the yarn cooling device according to the first or second aspect of the invention, which is arranged so as to surround the cooling cylinder, and flows into the yarn traveling space together with the filter. A cylindrical third punching plate that rectifies the cooling air is further provided, and the opening ratio of the third punching plate is higher in the upper part.

  According to the present invention, since the opening ratio of the third punching plate surrounding the cooling cylinder is higher in the upper part, the amount of cooling air flowing into the upper part of the yarn running space is increased, and the spinning beam The yarn immediately after spinning can be sufficiently cooled.

  A yarn cooling device according to a fourth invention is the yarn cooling device according to the third invention, wherein the first connection port and the second connection port are formed at a lower end portion of a side wall surface of the cooling cylinder housing chamber. It is characterized by being.

  When the first and second connection ports are provided at the lower end portion of the side wall surface of the cooling cylinder housing chamber, the cooling air hardly flows into the upper portion of the yarn traveling space. However, according to the present invention, since the opening ratio of the third punching plate surrounding the cooling cylinder is higher in the upper part, the cooling air flowing into the upper part of the yarn traveling space is also in such a case. The air volume can be increased, and the yarn immediately after being spun from the spinning beam can be sufficiently cooled.

  The yarn cooling device according to a fifth aspect of the present invention is the yarn cooling device according to any one of the first to fourth aspects, wherein the plurality of cooling cylinders are arranged in a staggered manner.

  In the case where a plurality of cooling cylinders are arranged in a staggered manner, if cooling air flows into the cooling cylinder housing chamber from only one side, in particular, in the yarn traveling space of the cooling cylinders constituting the other side row far from the duct Further, the cooling air hardly flows from the other side, and there is a possibility that the cooling air flowing into the yarn traveling space may vary.

  However, in the present invention, since the cooling air supplied from the duct flows into the cooling cylinder housing chamber from both sides via the first and second connection flow paths, a plurality of cooling cylinders are arranged in a staggered manner. However, cooling air flows evenly from the entire circumference into the yarn traveling space.

  According to the present invention, the cooling air supplied from the duct flows into the cooling cylinder storage chamber from both sides via the upper connection flow path and the lower connection flow path. The cooling air flows evenly from the entire circumference, and the yarn traveling in the yarn traveling space can be evenly cooled.

1 is a schematic configuration diagram of a melt spinning apparatus according to an embodiment of the present invention. It is a top view of the yarn cooling device of FIG. (A) is the IIIA-IIIA sectional view taken on the line of FIG. 2, (b) is the IIIB-IIIB sectional view taken on the line of FIG. It is the IV-IV sectional view taken on the line of Fig.3 (a) and FIG.3 (b). It is the VV sectional view taken on the line of Drawing 3 (a) and Drawing 3 (b).

  Hereinafter, preferred embodiments of the present invention will be described.

  As shown in FIG. 1, the melt spinning apparatus 1 includes a spinning beam 2, a yarn cooling device 3, an oil supply device 4, and the like. The spinning beam 2 includes a plurality of pack housings 11. Each pack housing 11 is provided with a spinning pack 12 in which a melted material that becomes the yarn Y, such as melted polyester, is stored. A base 13 is provided at the lower end of the spin pack 12, and in the spinning beam 2, a plurality of melted materials stored in the spin pack 12 are supplied from a plurality of through holes (not shown) formed in the base 13. The yarn Y is spun downward. Here, the plurality of caps 13 are arranged in a zigzag pattern in two rows along the left-right direction, similarly to the cooling cylinder 21 described later.

  The yarn cooling device 3 is disposed below the spinning beam 2 and cools the yarn Y spun from the spinning beam 2 as described later. The oil supply device 4 is disposed below the yarn cooling device 3 and applies an oil agent to the yarn Y cooled by the yarn cooling device 3. Then, the yarn Y to which the oil agent is applied by the oil supply device 4 is wound around the bobbin by a winding device (not shown) arranged below the oil supply device 4.

  Next, the configuration of the yarn cooling device 3 will be described. The yarn cooling device 3 includes a plurality of cooling cylinders 21, a cooling air supply box 22, and the like.

  The plurality of cooling cylinders 21 are respectively arranged in portions facing the bases 13 of the plurality of spinning packs 12, and are arranged in a staggered pattern in two rows along the left-right direction. Here, the reason why the plurality of bases 13 and the plurality of cooling cylinders 21 are arranged in a staggered manner is to arrange them at high density.

  A substantially circular yarn traveling space 31 extending in the vertical direction is formed inside each cooling cylinder 21, and the yarn Y spun from the base 13 moves downward through the yarn traveling space 31. Run. The side wall of the yarn traveling space 31 is a filter 32. The filter 32 rectifies the cooling air when the cooling air flows into the yarn traveling space 31 from a cooling cylinder housing chamber 41 described later.

  The cooling air supply box 22 is for supplying cooling air to the yarn traveling space 31 of the cooling cylinder 21 and has a substantially rectangular parallelepiped shape. A flow path 42 and a lower connection flow path 43 are formed.

  The cooling cylinder accommodation chamber 41 accommodates the plurality of cooling cylinders 21, and the cooling cylinder 21 penetrates the cooling cylinder accommodation chamber 41 vertically. In addition, a substantially cylindrical third punching plate 44 is disposed in the cooling cylinder housing chamber 41 so as to surround each of the plurality of cooling cylinders 21. A plurality of through holes are formed in the third punching plate 44, and the third punching plate 44, together with the filter 32, cools air from the cooling cylinder housing chamber 41 into the yarn traveling space 31, as will be described later. At that time, the cooling air is rectified. In the third punching plate 44, the opening ratio of the portion 44 a located in the substantially upper half of the cooling cylinder housing chamber 41 is higher than the opening ratio of the portion 44 b located in the substantially lower half of the cooling cylinder housing chamber 41. ing. Specifically, for example, the aperture ratio of the portion 44a is about 10 to 20%, while the aperture ratio of the portion 44b is about 1 to 3%.

  Further, the cooling cylinder housing chamber 41 is provided with a first connection port 45 at the lower end portion of the side wall surface 41a on the rear side (duct 60 side), and the side wall surface on the front side (opposite side of the duct 60). The 2nd connection port 46 is provided in the lower end part of 41b. In addition, a first punching plate 47 and a second punching plate 48 are disposed in the first connection port 45 and the second connection port 46, respectively. The first punching plate 47 and the second punching plate 48 are plate-like bodies in which a plurality of through holes are formed. As will be described later, the cooling cylinder housing chamber 41 is formed from the upper connection flow path 42 and the lower connection flow path 43. The cooling air is rectified when the cooling air flows into the. Further, the aperture ratio of the second punching plate 48 is equal to or higher than the aperture ratio of the first punching plate 47. Specifically, for example, the aperture ratio of the first punching plate 47 is about 5 to 10%, whereas the aperture ratio of the second punching plate 48 is 1 to 3 times the aperture ratio of the first punching plate 47. It is about.

  The upper connection flow path 42 extends in the front-rear direction, the front end portion thereof is connected to the first connection port 45, and the rear end portion thereof is the front end portion of the duct 60 disposed behind the cooling air supply box 22. It is connected to the upper half.

  The lower connection flow path 43 is disposed below the upper connection flow path 42, and the rear end portion thereof is connected to the substantially lower half of the front end portion of the duct 60, and the cooling cylinder is connected from the connection portion with the duct 60. The lower part of the storage chamber 41 extends forward from the second connection port 46, and is bent by about 180 ° at the front end thereof and connected to the second connection port 46. That is, the lower connection flow path 43 extends so as to wrap around the lower side of the cooling cylinder housing chamber 41 and is connected to the second connection port 46.

  The yarn traveling space 31 in the cooling cylinder 21 described above extends downward from the cooling cylinder housing chamber 41 and penetrates the lower connection flow path 43 in the vertical direction. However, a portion of the yarn traveling space 31 that is located in the lower connection flow path 43 is defined by a partition tube 49 that is different from the third punching plate 44 and has no through holes. As a result, the cooling air does not flow directly from the lower connection flow path 43 into the yarn traveling space 31.

  Further, a punching plate 51 is disposed at a connection portion between the upper connection flow path 42 and the lower connection flow path 43 and the duct 60. The punching plate 51 is a plate-like body in which a plurality of through holes are formed, and rectification of the cooling air when the cooling air flows from the duct 60 into the upper connection channel 42 and the lower connection channel 43 as will be described later. I do.

  Next, the flow of the cooling air until the cooling air supplied from the duct 60 flows into the yarn traveling space 31 will be described. The arrows shown in FIGS. 3 to 5 indicate the flow of cooling air. The cooling air flowing through the duct 60 is divided into upper and lower portions at the connection portion between the upper connection flow path 42 and the lower connection flow path 43, rectified by the punching plate 51, and then the upper connection flow path 42 and the lower connection flow path. It flows into the flow path 43.

  The cooling air flowing into the upper connection flow path 42 is further rectified by the first punching plate 47 and then flows into the cooling cylinder housing chamber 41 from the first connection port 45. Further, the air is rectified from the cooling cylinder housing chamber 41 by the third punching plate 44 and the filter 32 and flows into the yarn traveling space 31.

  On the other hand, the cooling air that has flowed into the lower connection flow path 43 flows below the cooling cylinder housing chamber 41, so that the cooling air flows forward from the second connection port 46 and is then rectified by the second punching plate 48. Then, it flows into the cooling cylinder housing chamber 41 from the second connection port 46. Further, the air is rectified from the cooling cylinder housing chamber 41 by the third punching plate 44 and the filter 32 and flows into the yarn traveling space 31.

  Then, the yarn Y spun from the spinning beam 2 and traveling in the yarn traveling space 31 is cooled by the cooling air flowing into the yarn traveling space 31 in this way.

  At this time, cooling air flows into the cooling cylinder 21 from the entire circumference, but it is assumed that the cooling air flows into the cooling cylinder housing chamber 41 only from the first connection port 45. Assuming that the cooling air flows into the cooling cylinder housing chamber 41 only from the rear where the 60 is disposed, the amount of cooling air flowing around the cooling cylinder 21 and flowing into the yarn traveling space 31 from the front is The air volume is smaller than the amount of cooling air that flows into the yarn traveling space 31 from behind without going around the cooling cylinder 21. In particular, when a plurality of cooling cylinders are arranged in a staggered manner in two rows as in the present embodiment, the cooling cylinders 21 constituting the front row far from the first connection port 45 (duct 60). The amount of cooling air flowing into the yarn traveling space 31 from the front of the yarn is particularly small. That is, there is a possibility that the air volume of the cooling air flowing into the yarn traveling space 31 may vary. As a result, the yarn Y traveling in the yarn traveling space 31 is not uniformly cooled, and the quality of the yarn Y may be deteriorated, such as occurrence of uneven thickness.

  Here, by arranging a duct in front of the cooling air supply box 22 as well, it is conceivable that the cooling air flows into the cooling cylinder housing chamber 41 from both the front and rear sides. Since it is necessary to provide a space for a person to perform work, it is difficult to arrange a duct in front of the cooling air supply box 22.

  Therefore, in the present embodiment, as described above, in addition to the upper connection flow path 42 connected to the first connection port 45 formed at the lower end portion of the side wall surface 41a of the cooling cylinder storage chamber 41, the cooling cylinder storage By providing a lower connection flow path 43 that extends below the chamber 41 and is connected to the second connection port 46 formed on the side wall surface 41 b of the cooling cylinder housing chamber 41, the cooling cylinder housing chamber 41 is provided. Cooling air is introduced from both the front and rear sides. Thereby, the difference between the air volume of the cooling air flowing into the yarn traveling space 31 from the front and the air volume of the cooling air flowing into the yarn traveling space 31 from the rear is reduced, and the yarn traveling space 31 is introduced from the entire circumference thereof. Cooling air flows evenly. Accordingly, the yarn Y traveling in the yarn traveling space 31 is evenly cooled.

  However, in this case, the lower connection flow path 43 is longer than the upper connection flow path 42, and the cooling air flowing through the lower connection flow path 43 is the same as the cooling air flowing through the upper connection flow path 42. However, since it collides with the partition tube 49 in the middle, the amount of the cooling air flowing in the vicinity of the second connection port 46 of the lower connection channel 43 is the cooling flowing in the vicinity of the first connection port 45 of the upper connection channel 42. It is smaller than the wind volume.

  However, in the present embodiment, since the aperture ratio of the second punching plate 48 is equal to or greater than the aperture ratio of the first punching plate 47, the cooling air easily flows from the lower connection flow path 43 into the cooling cylinder housing chamber 41. Thus, the cooling air can be evenly flowed into the cooling cylinder housing chamber 41 from both the front and rear sides.

  Also, in order to make the yarn Y spun from the spinning beam 2 (the base 13) of high quality without unevenness in thickness, the yarn Y is cooled as soon as possible after spinning. Is preferred. That is, it is preferable that the amount of cooling air flowing into the upper portion of the yarn traveling space 31 is large. However, in the case where the first connection port 45 and the second connection port 46 are provided at the lower ends of the side wall surfaces 41a and 41b of the cooling cylinder housing chamber 41 as in the present embodiment, the third connection port temporarily If the aperture ratio of the punching plate is constant, the cooling air hardly flows into the upper part of the yarn traveling space 31, and the yarn Y immediately after being spun from the spinning beam 2 can be sufficiently cooled. There is a possibility that it cannot be done. In the present embodiment, the distance of the lower connection flow path 43 disposed below the cooling cylinder housing chamber 41 is made as short as possible, or interference between the other part of the melt spinning apparatus 1 and the duct 60 is prevented. For example, the first connection port 45 and the second connection port 46 are provided at the lower ends of the side wall surfaces 41a and 41b of the cooling cylinder housing chamber 41.

  However, in the present embodiment, the aperture ratio of the portion 44a of the third punching plate 44 is larger than the aperture ratio of the portion 44b. Thus, even when the first connection port 45 and the second connection port 46 are connected to the lower end portion of the cooling cylinder housing chamber 41, the cooling air sufficiently flows into the upper portion of the yarn traveling space 31, and spinning. The yarn Y immediately after being spun from the beam 2 can be sufficiently cooled.

  Next, modified examples in which various changes are made to the present embodiment will be described. However, the description of the same configuration as the present embodiment will be omitted as appropriate.

  In the above-described embodiment, the plurality of cooling cylinders 21 are arranged in a staggered pattern in two rows along the left-right direction, but the arrangement of the cooling cylinders 21 is not limited to this. For example, the plurality of cooling cylinders 21 may be arranged in one row in the left-right direction, and when the cooling cylinders 21 are arranged in two rows in the left-right direction, the cooling cylinders 21 are not staggered, The cooling cylinders 21 constituting the rows may be arranged so that the positions in the left-right direction are the same.

  When cooling air is allowed to flow into the cooling cylinder housing chamber 41 only from the rear side where the duct 60 is disposed, although there is a difference depending on the arrangement of the cooling cylinders 21, the cooling pipe 21 wraps around the yarn traveling space 31 from the front. The amount of cooling air flowing into the yarn becomes smaller than the amount of cooling air flowing into the yarn traveling space 31 from behind without going around the cooling cylinder 21. However, as in the above-described embodiment, if the cooling air is allowed to flow from both the front and rear sides of the cooling cylinder housing chamber 41, the yarn traveling space 31 is evenly distributed from the entire circumference regardless of the arrangement of the cooling cylinders 21. Cooling air can flow into the.

  Moreover, in the above-mentioned embodiment, although the 1st connection port 45 and the 2nd connection port 46 were provided in the lower end part of the side wall surfaces 41a and 41b of the cooling cylinder storage chamber 41, a 1st, 2nd connection port is Alternatively, it may be provided in a portion other than the lower end portions of the side wall surfaces 41a and 41b, such as the central portion and the upper end portion of the side wall surfaces 41a and 41b of the cooling cylinder housing chamber 41. Even in these cases, if the opening ratio of the upper portion 44a of the third punching plate 44 is larger than the opening ratio of the lower portion 44b, regardless of the position of the first and second connection ports, The amount of cooling air flowing into the upper portion of the yarn traveling space 31 is increased, and the yarn Y immediately after being spun from the spinning beam 2 can be sufficiently cooled.

  In the above-described embodiment, the aperture ratio of the portion 44a of the third punching plate 44 is set to about 10 to 20%, and the aperture ratio of the portion 44b is set to about 1 to 3%. Is higher than the opening ratio of the portion 44b, the opening ratio of the third punching plate 44 is not limited to this. At this time, a through hole may not be formed in the portion 44b (the opening ratio may be 0%).

  Furthermore, in the above-described embodiment, the third punching plate 44 is divided into the upper and lower portions 44a and 44b so that the opening ratio of the portion 44a is higher than the opening ratio of the portion 44b. Instead, the third punching plate 44 may be divided into three or more upper and lower parts, and the upper part may have a higher aperture ratio.

  Further, the aperture ratio of the third punching plate 44 may be constant. For example, as described above, when the first and second connection ports are provided at the upper ends of the side wall surfaces 41a and 41b of the cooling cylinder housing chamber 41, the aperture ratio of the third punching plate 44 is constant. Even if it is, the air volume of the cooling air flowing into the upper part of the yarn traveling space 31 is sufficiently large.

  In the above-described embodiment, the aperture ratio of the second punching plate 48 is equal to or higher than the aperture ratio of the first punching plate 47. However, the present invention is not limited to this, and the aperture ratio of the second punching plate 48 is The aperture ratio of the first punching plate 47 may be smaller. Even in this case, although the amount of cooling air flowing into the cooling cylinder housing chamber 41 from the front becomes small, the cooling air flows into the cooling cylinder housing chamber 41 from both the front and rear sides, so that the cooling air flows into the cooling cylinder housing chamber 41 only from the rear. Compared to the case, the cooling air can be made to flow evenly from the entire circumference into the yarn traveling space 31.

2 Spinning Beam 3 Yarn Cooling Device 13 Base 21 Cooling Tube 22 Cooling Air Supply Box 31 Yarn Traveling Space 32 Filter 41 Cooling Tube Housing Chamber 42 Upper Connection Channel 43 Lower Connection Channel 44 Third Punching Plate 45 First Connection Port 46 Second connection port 47 First punching plate 48 Second punching plate 49 Partition tube 60 Duct

Claims (5)

A yarn cooling device that cools a yarn spun from a spinning beam that spins a melted material downward as a yarn from a plurality of bases,
The yarn is arranged below the spinning beam so as to face the plurality of bases, and the inside thereof is a yarn running space extending in the vertical direction in which the spun yarn runs, and the yarn A plurality of cooling cylinders, in which the side walls of the strip running space are filters that rectify the cooling air flowing from the outside,
A cooling air supply box for supplying cooling air to the yarn traveling space of the plurality of cooling cylinders,
In the cooling air supply box,
A cooling cylinder storage chamber in which the plurality of cooling cylinders are stored;
A duct for supplying cooling air, which is arranged on one side of the cooling cylinder housing chamber as viewed from the vertical direction, and a connection flow path connecting the cooling cylinder housing chamber are formed,
The cooling cylinder housing chamber has a first connection port and a second connection port on the side wall surface on the duct side and on the side wall surface opposite to the duct, respectively, for connection with the connection flow path. Formed,
The connection flow path is
An upper connection flow path connecting the first connection port and the duct;
A lower connection flow path disposed below the upper connection flow path, connected to the duct and extending around the lower side of the cooling cylinder housing chamber and connected to the second connection port; A yarn cooling device comprising: A first punching plate that is disposed in the first connection port and rectifies cooling air flowing into the cooling cylinder housing chamber from the upper connection flow path;
A second punching plate that is disposed in the second connection port and rectifies cooling air flowing into the cooling cylinder housing chamber from the lower connection flow path;
2. The yarn cooling device according to claim 1, wherein an aperture ratio of the second punching plate is equal to or higher than an aperture ratio of the first punching plate. It is arranged so as to surround the cooling cylinder, and further includes a cylindrical third punching plate that rectifies cooling air flowing into the yarn traveling space together with the filter,
3. The yarn cooling device according to claim 1, wherein an opening ratio of the third punching plate is higher toward an upper portion. 4.   The yarn cooling device according to claim 3, wherein the first connection port and the second connection port are formed at a lower end portion of a side wall surface of the cooling cylinder housing chamber.   The yarn cooling device according to any one of claims 1 to 4, wherein the plurality of cooling cylinders are arranged in a staggered manner.

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