CN115613174A - Cooling device and thread processing machine - Google Patents

Abstract

The invention relates to a cooling device and a yarn processing machine, which can improve the cooling efficiency of yarn in the cooling device for cooling yarn by cooling wind. A cooling device (14) is provided with: a cooling unit (31) in which a yarn advancing space (S) in which the yarn (Y) advances is formed; and an air intake duct (32) in which an air intake space (Ss) connected to the yarn running space is formed. The air intake duct has a duct wall (34) formed with 1 or more air intake slits (38) arranged between the wire running space and the air intake space in the flow direction of the cooling air flow and extending in the unit longitudinal direction. The cooling unit has a pair of unit wall plates (51) arranged on one side of the duct wall in the height direction. The pair of cell wall plates have a pair of cell wall surfaces (55) arranged on opposite sides of the wire running space in the width direction. The length of each of the pair of cell wall surfaces in the height direction is 30mm or less.

Description

Cooling device and thread processing machine

Technical Field

The present invention relates to a cooling device for cooling a yarn and a yarn processing machine including the same.

Background

Patent document 1 discloses a cooling device provided in a false twist processing machine (yarn processing machine) that false-twists a running yarn. More specifically, the cooling device has a duct for supplying cooling air to the yarn and a pair of yarn guides disposed on the lower side of the duct. A thread running space in which the thread runs is formed between the pair of thread guides, and the thread running space is connected to an inner space of the duct (an intra-duct space) via a slit formed in a lower portion of the duct. When an exhaust fan (negative pressure generating device) provided at an end of the duct is rotated, negative pressure is generated in the space in the duct. Thereby, the gas flows into the filament traveling space connected to the space in the duct. Such gas cools the wire as cooling air.

Patent document 1: japanese patent laid-open publication No. 2011-047074

In recent years, for example, for the purpose of cooling a wire thicker than conventional wires, further improvement in the cooling efficiency of the wire has been demanded. In the above-described cooling device, in order to improve the cooling efficiency of the yarn, it is desirable to increase the speed (wind speed) of the cooling wind. However, the present inventors have found the following problems: even if the rotational speed of the exhaust fan (i.e., the output of the negative pressure generating device) is simply increased to increase the negative pressure in the space in the duct, the wind speed is difficult to be increased.

Disclosure of Invention

The invention aims to improve the cooling efficiency of a yarn in a cooling device for cooling the yarn by cooling air.

The cooling device of claim 1 is configured to cool a running yarn by cooling air, and includes: a cooling unit formed such that a yarn running space in which the yarn runs extends in a predetermined longitudinal direction; and a duct in which a duct space connected to the yarn running space is formed, the duct having a duct wall portion in which 1 or more slits extending in the longitudinal direction are formed, the slits being arranged between the yarn running space and the duct space in a flow direction in which the cooling air flows, the cooling unit having a pair of unit wall portions arranged on one side of the duct wall portion in a height direction orthogonal to the longitudinal direction, the pair of unit wall portions having a pair of unit wall surfaces arranged on opposite sides of the yarn running space in a width direction orthogonal to both the longitudinal direction and the height direction, the pair of unit wall surfaces each having a length in the height direction of 30mm or less.

In the present invention, when negative pressure (or positive pressure may be used) is generated in the space inside the duct, the cooling air flows into the wire running space (space formed between the pair of cell wall surfaces) connected to the space inside the duct. The cooling air flows mainly in the height direction in the yarn running space. Here, when the pair of cell wall surfaces forming the flow path of the cooling air is long in the height direction, the flow path resistance (frictional resistance) when the cooling air flows in the height direction is large, and therefore, a large pressure loss occurs, and the speed (wind speed) of the cooling air is greatly reduced. In this regard, in the present invention, the length of each of the pair of cell wall surfaces in the height direction (hereinafter, also referred to as wall surface height for convenience of description) is 30mm or less. This shortens the flow path through which the cooling air flows. Therefore, the flow path resistance can be reduced to reduce the pressure loss, and thus a large wind speed can be obtained. Therefore, in the cooling device for cooling the yarn by the cooling air, the cooling efficiency of the yarn can be improved.

The cooling device of claim 2 is configured to cool a running yarn by cooling air, and includes: a cooling unit formed such that a yarn running space in which the yarn runs extends in a predetermined longitudinal direction; and a duct in which a duct space connected to the yarn running space is formed, the duct including a duct wall portion in which 1 or more slits extending in the longitudinal direction are formed, the slit being disposed between the yarn running space and the duct space in a flow direction in which the cooling air flows, the cooling unit including a pair of unit wall portions disposed on one side of the duct wall portion in a height direction orthogonal to the longitudinal direction, the pair of unit wall portions including a pair of unit wall surfaces disposed on opposite sides of the yarn running space in a width direction orthogonal to both the longitudinal direction and the height direction, a total length of 1 or more formation regions in which the 1 or more slits are formed in the duct wall portion being longer than a total length of regions other than the 1 or more formation regions in the longitudinal direction in a wall surface disposition region in which the pair of unit wall surfaces are disposed.

In the present invention, the sum of the lengths of 1 or more formation regions is longer than the sum of the lengths of the other regions in the longitudinal direction. This can increase the total of the cross-sectional areas (i.e., opening areas) of the 1 or more slits. Therefore, the flow path resistance can be reduced to reduce the pressure loss, and thus a large wind speed can be obtained. Thus, the cooling efficiency of the yarn can be improved. In addition, a configuration in which one slit is formed over the entire wall surface disposition region in the longitudinal direction is also included in the present invention.

The cooling device according to claim 3 is characterized in that, in the above-described 1 st aspect, in the wall surface arrangement region in which the pair of cell wall surfaces are arranged, a total length of 1 or more formation regions in the duct wall portion in which the 1 or more slits are formed is longer than a total length of regions other than the 1 or more formation regions in the longitudinal direction.

In the present invention, the total length of 1 or more formation regions is long, as in the configuration of the invention 2. This can further reduce the flow path resistance and further reduce the pressure loss. Therefore, a larger wind speed can be obtained. Therefore, the cooling efficiency of the yarn can be further improved.

The cooling device according to claim 4 is characterized in that, in the above-described 1 st or 3 rd aspect, a distance between portions of the pair of cell wall surfaces facing each other in the width direction is 1mm or less in the width direction.

The "portions of the pair of cell wall surfaces facing each other in the width direction" in the present invention means portions of the pair of cell wall surfaces that are substantially parallel to each other and portions where no other member is disposed between the pair of cell wall surfaces in the width direction. In general, if the flow rate of the fluid is the same, the flow velocity of the fluid is high when the cross-sectional area of the flow path is small. However, if the width of the flow path is too narrow, the pressure loss due to the wall surface forming the flow path becomes large, and the flow rate of the fluid becomes small. In the present invention, the pressure loss caused by the pair of cell wall surfaces can be reduced by reducing the height of the wall surfaces, and therefore, even if the interval in the width direction between the pair of cell wall surfaces is reduced, the increase in pressure loss caused by this can be suppressed. Therefore, the area of the cross section of the yarn running space perpendicular to the height direction can be reduced, and the wind speed can be further increased.

A cooling device according to claim 5 is the cooling device according to any one of claims 1 to 4, wherein the cooling unit includes 1 or more thread guides, and the 1 or more thread guides are disposed in the thread running space and configured to restrict movement of the thread to the other side in the height direction.

In the present invention, since the movement of the wire to the other side in the height direction can be restricted by the wire guide, the entry of the wire into the space in the duct can be suppressed.

The cooling device according to claim 6 is characterized in that, in the above-described 5 th aspect, the one end portion of the 1 or more yarn guides is disposed closer to the one side than the center of the pair of cell wall surfaces in the height direction.

In the present invention, the yarn guide is disposed at a position distant from the duct in the height direction, and therefore the entire yarn can be distant from the duct in the height direction. Thus, the wire can be reliably prevented from entering the space in the duct.

A cooling device according to claim 7 is the cooling device according to any one of claims 1 to 6, wherein the cooling unit includes: a 1 st contact portion provided on a part of one of the pair of cell wall surfaces, the first contact portion being in contact with the filament; and a 2 nd contact portion provided on a part of the other of the pair of cell wall surfaces, disposed at a position different from the 1 st contact portion in the longitudinal direction, and configured to be contacted by the wire.

In the present invention, the thread can be advanced while being in contact with the 1 st contact portion or the 2 nd contact portion. Thereby, the movement of the wire in the width direction is restricted. Further, the yarn can be cooled more efficiently by bringing the yarn into contact with the 1 st contact portion or the 2 nd contact portion cooled by the cooling wind.

A cooling device according to claim 8 is the cooling device according to any one of claims 1 to 7, further including a negative pressure generating device configured to generate a negative pressure in the pipe space.

In general, an oil agent for smoothly advancing the yarn is applied to the yarn. Therefore, for example, in a configuration in which cooling air is supplied from the pipe space to the yarn running space, the oil agent may be scattered to the external space. In the present invention, since the cooling air can be sucked into the space in the duct, the problem of scattering of the oil agent can be avoided.

In the cooling device according to claim 9, in the cooling device according to claim 8, the negative pressure generating device includes: an impeller configured to be rotatable; a motor configured to rotationally drive the impeller; and a rotation speed changing unit configured to be capable of changing a rotation speed of a rotation shaft of the motor.

In the cooling device of the present invention, even if the negative pressure generated by the negative pressure generating device is smaller than that of the conventional cooling device, a large wind speed can be obtained. Here, when the negative pressure generating device is configured to be able to change the negative pressure in accordance with the rotation speed of the rotating shaft of the motor, it is generally known that the power consumption of the motor is proportional to the third power of the corresponding rotation speed. Therefore, by reducing the corresponding rotational speed as compared with the conventional one, the power consumption of the negative pressure generator can be greatly reduced while obtaining a desired wind speed.

The yarn processing machine according to claim 10 is characterized by comprising: the cooling device according to any one of the above 1 to 9; a yarn deformation applying device configured to apply deformation to the yarn; and a yarn feeding device configured to feed the yarn to the cooling device and the yarn deformation applying device for running the yarn, wherein the yarn processing machine is configured to process the yarn while running the yarn.

In the present invention, the cooling device can be downsized and/or the power consumption can be reduced while efficiently cooling the wire. Therefore, the entire yarn processing machine can be downsized and/or the power consumption can be reduced while ensuring good quality of the yarn processed by the yarn processing machine.

Drawings

Fig. 1 is a side view of a false twist processing machine according to the present embodiment.

FIG. 2 is a schematic drawing of the unwinding of the false twist texturing machine along the path of the yarn.

Fig. 3 is a view in the direction III of fig. 1.

Fig. 4 (a) is an enlarged view of a part of fig. 3, and (b) is a view showing a cooling unit by a dotted line in the enlarged view of a part of fig. 3.

FIG. 5 is a sectional view taken along line V-V of FIG. 4 (a).

Fig. 6 is a further schematic diagram of the cooling unit.

Fig. 7 is an enlarged view of a part of fig. 4 (b).

Fig. 8 is a table showing the results of evaluation of the wind speed of the cooling wind and the power consumption of the cooling device.

Fig. 9 is a graph showing a relationship between the wind speed and the negative pressure of the cooling wind.

Fig. 10 is a graph showing a relationship between the power consumption of the cooling device and the wind speed of the cooling wind.

Fig. 11 is a graph showing a relationship between a difference in the configuration of the cooling device and the wind speed of the cooling wind.

Description of the symbols

1: a false twist processing machine (yarn processing machine); 11: 1 st supply roller (thread conveying device); 14: a cooling device; 15: a false twisting device (a thread texturing applying device); 31: a cooling unit; 31A: a cooling unit; 32: an air intake duct (pipe); 33: a negative pressure generating device; 34: a duct wall; 35: an impeller; 36: a motor; 37: an inverter (rotation speed changing unit); 38: an air intake slit (slit); 51: a unit wall plate (unit wall portion); 51a: a unit wall plate (unit wall portion); 51b: a unit wall plate (unit wall portion); 55: a cell wall surface; 55a: a cell wall surface; 55b: a cell wall surface; 56a: a contact body (1 st contact portion); 56b: a contact body (2 nd contact portion); 58: a thread guide; g: spacing; r: a wall surface configuration area; r1: forming a region; r2: a non-formation region; s: a yarn running space; and (Ss): an air intake space (space in a pipe); y: and (4) silk threads.

Detailed Description

Next, embodiments of the present invention will be explained. The direction perpendicular to the paper surface in fig. 1 is the machine longitudinal direction. For convenience of explanation, the front side of the paper of fig. 1 and the left side of the paper of fig. 2 are referred to as one side in the longitudinal direction of the body, and the back side of the paper of fig. 1 and the right side of the paper of fig. 2 are referred to as the other side in the longitudinal direction of the body. The left-right direction of the paper surface in fig. 1 is the machine width direction. A direction orthogonal to both the machine body longitudinal direction and the machine body width direction is set as a vertical direction (vertical direction) in which gravity acts. The direction in which a plurality of yarns Y (described later) run side by side is referred to as a yarn running direction.

(integral constitution of false twist processing machine)

First, the overall configuration of the false twist processing machine 1 (yarn processing machine of the present invention) according to the present embodiment will be described with reference to fig. 1 to 3. FIG. 1 is a side view of a false twist texturing machine 1. FIG. 2 is a schematic view showing the false twist texturing machine 1 being unwound along the path of the yarn Y (yarn path). Fig. 3 is a view in direction III of fig. 1.

The false twist processing machine 1 is configured to be capable of false twisting a yarn Y made of a synthetic fiber (for example, polyester). The yarn Y is, for example, a multifilament yarn formed of a plurality of filaments. Alternatively, the yarn Y may be composed of one filament. The false twist processing machine 1 includes a yarn feeding section 2, a processing section 3, and a winding section 4. The yarn feeder 2 is configured to be able to feed the yarn Y. The processing section 3 is configured to draw the yarn Y from the yarn feeding section 2 and perform false twisting. The winding unit 4 is configured to wind the yarn Y processed by the processing unit 3 around the winding bobbin Bw. A plurality of components included in the yarn feeding section 2, the processing section 3, and the winding section 4 are arranged in the machine longitudinal direction (see fig. 2). The machine body longitudinal direction is a direction orthogonal to a running surface (paper surface in fig. 1) of the yarn Y formed by the yarn path from the yarn feeding unit 2 to the winding unit 4 through the processing unit 3.

The yarn feeding section 2 has a creel 7 that holds a plurality of yarn feeding packages Ps, and feeds a plurality of yarns Y to the processing section 3. The processing unit 3 is configured to draw out a plurality of yarns Y from the yarn feeding unit 2 and process the yarns. The processing section 3 is configured such that, for example, a 1 st yarn feeding roller 11 (yarn feeding device of the present invention), a twist stop yarn guide 12, a 1 st heating device 13, a cooling device 14, a false twisting device 15 (yarn texturing applying device of the present invention), a 2 nd yarn feeding roller 16, a crosswinding device 17, a 3 rd yarn feeding roller 18, a 2 nd heating device 19, and a 4 th yarn feeding roller 20 are arranged in this order from the upstream side in the running direction of the yarn. The winding unit 4 includes a plurality of winding devices 21. Each winding device 21 winds the yarn Y false-twisted by the processing section 3 on a winding bobbin Bw to form a winding package Pw.

The false twist processing machine 1 has a main body 8 and a take-up table 9 arranged at intervals in the body width direction. The main body 8 and the take-up table 9 are provided to extend substantially the same length in the machine longitudinal direction. The main body 8 and the winding table 9 are disposed so as to face each other in the body width direction. A working space Sw (see fig. 1) for an operator to perform a work such as threading is formed between the main body 8 and the winding table 9. The false twist texturing machine 1 has a unit called span, which includes 1 set of a main body 8 and a take-up table 9. In one span, each device is configured to simultaneously perform false twisting on a plurality of yarns Y running in a state aligned in the longitudinal direction of the machine body. The false twist texturing machine 1 is arranged such that the span is bilaterally symmetric on the paper surface about a center line C of the main body 8 in the machine width direction as a symmetry axis (the main body 8 is common in the left and right spans). Further, a plurality of spans are arranged in the longitudinal direction of the body.

(constitution of processing portion)

The structure of the processing section 3 will be described with reference to fig. 1 and 2. The 1 st yarn supplying roller 11 is configured to unwind the yarn Y from the yarn supply package Ps attached to the yarn supplying section 2 and feed the yarn Y to the 1 st heating device 13. For example, as shown in fig. 2, the 1 st yarn feeding roller 11 is configured to feed 1 yarn Y to the 1 st heating device 13. Alternatively, the 1 st yarn feeding roller 11 may be configured to be capable of feeding a plurality of adjacent yarns Y to the downstream side in the yarn running direction. The yarn twisting prevention guide 12 is configured so that the twist applied to the yarn Y by the false twisting device 15 does not propagate upstream of the yarn twisting prevention guide 12 in the yarn running direction.

The 1 st heating device 13 is configured to heat the yarn Y fed from the 1 st yarn feeding roller 11. For example, as shown in fig. 2, the 1 st heating device 13 is configured to be able to heat 2 wires Y, but is not limited thereto. The 1 st heating device 13 may be configured to heat 1 yarn Y, for example. Alternatively, the 1 st heating device 13 may be configured to be able to heat 3 or more yarns Y.

The cooling device 14 is a non-contact device that cools the plurality of yarns Y by cooling air. As shown in fig. 3, the cooling device 14 includes a plurality of cooling units 31, an intake duct 32 (duct of the present invention) to which the plurality of cooling units 31 are attached, and a negative pressure generating device 33. The cooling device 14 generates negative pressure in the internal space of the intake duct 32 (intake space ss, duct space of the present invention) by the negative pressure generating device 33, and thereby supplies cooling air to the plurality of filament running spaces S formed in the plurality of cooling units 31, respectively. The negative pressure is a pressure lower than the atmospheric pressure (more specifically, in the present embodiment, the atmospheric pressure in the space outside the cooling device 14).

As shown in fig. 3, the plurality of cooling units 31 are arranged in the longitudinal direction of the machine body. The plurality of cooling units 31 are attached to the intake duct 32. Each of the plurality of cooling units 31 extends in a direction intersecting with (substantially orthogonal to) the longitudinal direction of the body. In the present embodiment, each cooling unit 31 extends substantially linearly. However, the present invention is not limited to this (for example, each cooling unit 31 may be curved). Each cooling unit 31 has a yarn running space S in which 1 yarn Y runs. The yarn Y running in the yarn running space S is cooled by the cooling wind. The plurality of cooling units 31 include two cooling units 31A and 31B arranged adjacent to each other in the longitudinal direction of the machine body. The interval between the cooling unit 31A and the cooling unit 31B in the machine longitudinal direction increases toward the downstream side in the yarn running direction, for example. The two cooling units 31A and 31B are formed in line symmetry with each other with a predetermined straight line L as a symmetry axis.

The intake duct 32 is a duct configured to supply cooling air to the plurality of cooling units 31. As shown in fig. 3, the air intake duct 32 extends along the length of the body. An intake space Ss extending in the longitudinal direction of the body is formed in the intake duct 32. The air intake space Ss is connected to the plurality of filament running spaces S. A plurality of cooling units 31 are installed in the intake duct 32. More specifically, duct wall portion 34 extending in the longitudinal direction of the body is formed in intake duct 32. The plurality of cooling units 31 are screwed to the duct wall 34, for example. The duct wall 34 is formed with a plurality of air intake slits 38 (see fig. 4 (b). The slits of the present invention will be described in detail later).

The negative pressure generating device 33 is, for example, a known blower. The negative pressure generating device 33 is disposed, for example, at one or the other (one in fig. 3, as an example) end of the intake duct 32 in the longitudinal direction of the body. The negative pressure generating device 33 includes, for example, a rotatable impeller 35, a motor 36 for rotationally driving the impeller 35, and an inverter device 37 (a rotation speed changing unit of the present invention) for changing the rotation speed of a rotating shaft (not shown) of the motor 36. The motor 36 is, for example, a well-known ac motor. The negative pressure generating device 33 rotates and drives the impeller 35 by the motor 36, thereby generating a negative pressure in the intake space Ss. More details about the cooling device 14 will be described later.

The false twisting device 15 is disposed downstream of the cooling device 14 in the yarn running direction, and is configured to twist the yarn Y. The false twisting device 15 is, for example, a known friction disc type false twisting device or a known belt type false twisting device, but is not limited thereto. The 2 nd yarn supplying roller 16 is configured to convey the yarn Y treated by the false twisting device 15 to the interlacing device 17. The feeding speed of the 2 nd yarn feeding roller 16 to the yarn Y is faster than the feeding speed of the 1 st yarn feeding roller 11 to the yarn Y. Thereby, the yarn Y is drawn and false-twisted between the 1 st yarn feeding roller 11 and the 2 nd yarn feeding roller 16.

The interlacing device 17 is configured to apply interlacing to the yarn Y. The interlacing device 17 has, for example, a known interlacing nozzle for applying interlacing to the yarn Y by an air flow.

The 3 rd yarn feeding roller 18 is configured to feed the yarn Y running downstream of the crosser 17 in the running direction of the yarn to the 2 nd heating device 19. For example, as shown in fig. 2, the 3 rd supply roll 18 is configured to convey 1 yarn Y to the 2 nd heating device 19. Alternatively, the 3 rd yarn feeding roller 18 may be configured to be capable of feeding each of the plurality of adjacent yarns Y to the downstream side in the yarn running direction. The feed speed of the yarn Y by the 3 rd yarn feed roller 18 is slower than the feed speed of the yarn Y by the 2 nd yarn feed roller 16. Accordingly, the yarn Y is slackened between the 2 nd yarn supplying roller 16 and the 3 rd yarn supplying roller 18. The 2 nd heating device 19 is configured to heat the yarn Y fed from the 3 rd yarn feeding roller 18. The 2 nd heating devices 19 extend in the vertical direction, and are provided one each in one span. The 4 th supply roll 20 is configured to feed the yarn Y heated by the 2 nd heating device 19 to the winding device 21. For example, as shown in fig. 2, the 4 th yarn supplying roll 20 is configured to be able to feed 1 yarn Y to the winding device 21. Alternatively, the 4 th yarn feeding roller 20 may be configured to be capable of feeding each of the plurality of adjacent yarns Y to the downstream side in the yarn running direction. The speed of the yarn Y fed by the 4 th yarn feeding roller 20 is slower than the speed of the yarn Y fed by the 3 rd yarn feeding roller 18. Accordingly, the yarn Y is slackened between the 3 rd supply roll 18 and the 4 th supply roll 20.

In the working section 3 configured as described above, the yarn Y stretched between the 1 st yarn feeding roller 11 and the 2 nd yarn feeding roller 16 is twisted by the false twisting device 15. The twist formed by the false twisting device 15 propagates to the yarn stop guide 12, and does not propagate upstream of the yarn stop guide 12 in the yarn advancing direction. The drawn and twisted yarn Y is cooled by a cooling device 14 after being heated and heat-set by a 1 st heating device 13. The yarn Y is untwisted on the downstream side of the false twisting device 15 in the yarn advancing direction, but the state in which the yarn Y is false-twisted in a wavy form (that is, the curl of the yarn Y is maintained) is maintained by the heat setting.

The false-twisted yarn Y is entangled by an entangling device 17 while being loosened between the 2 nd yarn feeding roller 16 and the 3 rd yarn feeding roller 18, and then guided to the downstream side in the yarn advancing direction. Further, the yarn Y is heat-treated by the 2 nd heating device 19 while being loosened between the 3 rd yarn feeding roller 18 and the 4 th yarn feeding roller 20. Finally, the yarn Y fed from the 4 th supply roll 20 is wound by the winding device 21.

(constitution of winding part)

The structure of the winding unit 4 will be described with reference to fig. 2. The winding unit 4 includes a plurality of winding devices 21. Each winding device 21 is configured to be able to wind the yarn Y around one winding bobbin Bw. The winding device 21 includes a fulcrum guide 41, a traverse device 42, and a cradle 43. The fulcrum guide 41 is a guide that serves as a fulcrum when the yarn Y traverses. The traverse device 42 is configured to be able to reciprocate the yarn Y by the traverse guide 45. The cradle 43 is configured to rotatably support the winding bobbin Bw. A contact roller 46 is disposed near the cradle 43. The contact roller 46 contacts the surface of the winding package Pw and applies a contact pressure. In the winding unit 4 configured as described above, the yarn Y fed from the 4 th yarn supply roll 20 is wound around the winding bobbin Bw by each winding device 21 to form a winding package Pw.

Here, in recent years, for example, for the purpose of cooling a yarn Y thicker than a conventional yarn Y, there is a demand for further improvement in the cooling efficiency of the yarn Y. Here, "improving cooling efficiency" may have various meanings. For example, "the yarn Y can be rapidly cooled in a short time", "a large wind speed can be obtained with a small negative pressure", and "the power consumption of the negative pressure generator 33 for obtaining a desired wind speed is reduced" all correspond to improvement of the cooling efficiency. Among them, in order to "rapidly cool the yarn Y in a short time", it is desirable to increase the speed (wind speed) of the cooling wind. However, the present inventors have found the following problems: even if the rotational speed of the impeller 35 (i.e., the output of the negative pressure generating device 33) is simply increased to increase the negative pressure in the intake duct 32, the wind speed is hard to increase. Therefore, in the present embodiment, the cooling device 14 further has the following configuration in order to improve the cooling efficiency of the yarn Y.

(detailed construction of Cooling device)

The cooling device 14 will be described in more detail with reference to fig. 4 (a) to 7. Fig. 4 (a) is an enlarged view of a part of fig. 3. Fig. 4 (b) is an enlarged view of a part of fig. 3, showing the cooling unit 31A by a broken line. Fig. 5 is a cross-sectional view taken along line V-V of fig. 4. Fig. 6 is a view further schematically illustrating the cooling unit 31A in order to make the yarn running space S easy to see. Fig. 7 is an enlarged view of a part of fig. 4 (b). The vertical direction of the paper of fig. 6 and 7 is parallel to the cell longitudinal direction described later.

As described above, the cooling unit 31A and the cooling unit 31B are formed in line symmetry with each other (see fig. 3). Therefore, only the cooling unit 31A will be described in detail below with respect to the cooling unit 31, and the description of the cooling unit 31B will be omitted.

The directions perpendicular to the paper surface in fig. 4 (a) and (b) are taken as the height direction. The height direction is parallel to the vertical direction of the paper of fig. 5. The height direction is a direction orthogonal to the longitudinal direction of the body. In the present embodiment, the height direction has at least a component in the vertical direction. In the present embodiment, one side in the height direction can be, in other words, substantially the lower side. The other side in the height direction can be, in other words, substantially the upper side. Note, however, that the relationship between the height direction and the up-down direction can be changed depending on the orientation in which the cooling device 14 is disposed.

For convenience of explanation, a direction orthogonal to both the longitudinal direction and the height direction of the body is referred to as an orthogonal direction (see fig. 4 (a)). The cooling unit 31A and the cooling unit 31B extend at least in the orthogonal direction. In the present embodiment, the cooling unit 31A and the cooling unit 31B each extend in a direction slightly inclined with respect to the orthogonal direction. The direction in which the cooling unit 31A extends is referred to as a unit longitudinal direction (longitudinal direction of the present invention). For convenience of description, a direction perpendicular to both the cell longitudinal direction and the height direction is referred to as a width direction (see fig. 5). The left side of the paper in fig. 5 is a width direction side. The right side of the paper of fig. 5 is the other side in the width direction.

In the present embodiment, the cell length direction is a predetermined one direction having a component in the orthogonal direction (see (a) and (b) of fig. 4)). In other words, in the present embodiment, the unit longitudinal direction is the same regardless of the position of the cooling unit 31 in the orthogonal direction. In addition, in the case where the cooling unit 31 is bent or the like when viewed from the height direction, the unit longitudinal direction changes depending on the position of the cooling unit 31 in the orthogonal direction.

(construction of Cooling Unit)

As shown in fig. 4 (a) to 7, the cooling unit 31A includes a pair of unit wall plates 51 (a pair of unit wall portions according to the present invention). The pair of unit wall plates 51 are disposed on one side in the height direction of the intake duct 32 (more specifically, on one side in the height direction of the duct wall portion 34). The pair of unit wall plates 51 ( unit wall plates 51a and 51 b) are long members for forming the yarn running space S. A yarn running space S is formed between a pair of cell wall surfaces 55 (described later) provided on the pair of cell wall plates 51 in the width direction. The cell wall plates 51a, 51b extend long in the cell longitudinal direction. The cell wall plate 51a is disposed on one side in the width direction of the yarn running space S. The unit wall plate 51b is disposed on the other side in the width direction of the yarn running space S.

The cell wall plate 51a is a member having a substantially C-shaped cross section formed by sheet metal working a metal flat plate member, for example (see fig. 5). The unit wall plate 51a may also be fixed to the duct wall 34, for example. Alternatively, the unit wall plate 51a may be configured to be movable at least in the width direction with respect to the unit wall plate 51 b. When the unit wall plate 51A is movable, for example, when maintenance of the cooling unit 31A is performed, cleaning work of the wire guide 58 and the like described later becomes easy. The cell wall plate 51a has a base end portion 52a, an intermediate portion 53a, and a tip end portion 54a (see fig. 5).

The base end portion 52a is a portion that is disposed at the other end portion in the height direction of the unit wall plate 51a and extends in the width direction. The intermediate portion 53a is a portion extending from the other end portion in the width direction of the base end portion 52a to one side in the height direction. A cell wall surface 55a extending at least in the height direction is formed at the other end in the width direction of the intermediate portion 53 a. The cell wall surface 55a is one of the pair of cell wall surfaces 55. The cell wall surface 55a is a surface including curved surfaces formed at both end portions in the height direction of the intermediate portion 53a during sheet metal working (see a thick line in fig. 5). The cell wall surface 55a is a surface for forming the yarn running space S in the cooling unit 31A. A plurality of contact bodies 56a (the 1 st contact portion of the present invention, see fig. 5 and 6) are provided on the cell wall surface 55a, for example, so as to be spaced apart from each other in the cell longitudinal direction. The contact body 56a is configured to positively contact the running yarn Y with the contact body 56 a. This can prevent the yarn Y from accidentally coming into contact with the portion of the unit wall surface 55a where the contact 56a is not provided. The thickness (i.e., the length in the width direction) of the contact 56a is, for example, 0.35mm. The distal end portion 54a is a portion extending from one end portion of the intermediate portion 53a in the height direction to one side in the width direction.

The unit wall plates 51b are formed by, for example, sheet metal working a metal flat plate member, and have a substantially C-shaped cross section facing the opposite direction of the unit wall plates 51a (see fig. 5). The unit wall plate 51b is fixed to the duct wall 34 by, for example, screws not shown. The unit wall plate 51b has a base end portion 52b, an intermediate portion 53b, and a tip end portion 54b in the cross section shown in fig. 5.

The base end portion 52b is a portion that is disposed at the other end portion in the height direction of the unit wall plate 51b and extends in the width direction. The intermediate portion 53b is a portion extending from one end portion of the base end portion 52b in the machine body longitudinal direction to one side in the height direction. A cell wall surface 55b extending at least in the height direction is formed at one end in the width direction of the intermediate portion 53 b. The cell wall surface 55b is the other of the pair of cell wall surfaces 55. The cell wall surface 55b is disposed on the opposite side of the cell wall surface 55a across the yarn running space S in the width direction. In other words, the pair of cell wall surfaces 55 are disposed on opposite sides of the wire running space S in the width direction. The cell wall surface 55b includes curved surfaces (see thick lines in fig. 5) formed at both end portions in the height direction of the intermediate portion 53b, similarly to the cell wall surface 55a. The cell wall surface 55b is a surface for forming the yarn running space S together with the cell wall surface 55a. The cell wall surface 55b is provided with a plurality of contact bodies 56b (the 2 nd contact portion of the present invention, see fig. 5 and 6) arranged so as to be separated from each other in the cell longitudinal direction, for example. This can prevent the yarn Y from accidentally coming into contact with the portion of the cell wall surface 55b where the contact 56b is not provided. The thickness (i.e., the length in the width direction) of the contact 56b is, for example, 0.35mm. The contact 56b is arranged at a position different from the contact 56a in the cell longitudinal direction (see fig. 6). The distal end portion 54b is a portion extending from one end portion in the height direction of the intermediate portion 53b to the other end portion in the width direction.

In the width direction, for example, a plurality of plate-like spacers 57 (only one is illustrated in fig. 5) are provided between the cell wall surface 55a and the cell wall surface 55b. The plurality of spacers 57 are disposed at intervals in the cell longitudinal direction (not shown). The spacers 57 are configured to define the distance between the cell wall surfaces 55a and 55b in the width direction (i.e., the distance between the cell wall surfaces in the width direction). The thickness (i.e., the length in the width direction) of the spacer 57 is, for example, 1mm or less. Thus, the distance G (see fig. 5) in the width direction between the portions facing each other in the width direction of the pair of cell wall surfaces 55 is 1mm or less. In the present embodiment, the "portions of the pair of cell wall surfaces 55 facing each other in the width direction" refers to portions of the pair of cell wall surfaces 55 that are substantially parallel to each other and portions where no other member is disposed between the pair of cell wall surfaces 55 in the width direction. In other words, in the portion where both of the cell wall surface 55a and the cell wall surface 55b extend in the height direction, the distance (gap G) between the cell wall surface 55a and the cell wall surface 55b in the width direction is 1mm or less. In the present embodiment, the two end portions (portions that are bent so as to be substantially parallel to each other) in the height direction of the pair of cell wall surfaces 55 are not included in the "portions facing each other in the width direction of the pair of cell wall surfaces 55". Further, for example, the interval between the cell wall surface 55a and the contact 56b in the width direction is 0.65mm, but the interval is not included in "the interval between the portions facing each other in the width direction in the pair of cell wall surfaces 55 in the width direction". The same applies to the spacing in the width direction between the cell wall surface 55b and the contact 56 a.

In the width direction, for example, a plurality of wire guides 58 (see fig. 5 and 6) are provided between the cell wall surface 55a and the cell wall surface 55b. Alternatively, only one wire guide 58 may be provided. The 1 or more yarn guides 58 are members for preventing the yarn Y from being drawn into the intake space Ss. Each of the yarn guides 58 is disposed in the yarn running space S. As an example, 3 wire guides 58 are provided in the present embodiment. Each of the yarn guides 58 is disposed on the side of the spacer 57 in the height direction, for example. Each of the yarn guides 58 is configured such that the yarn Y contacts one end portion of each of the yarn guides 58 in the height direction. Thereby, the yarn guides 58 restrict the movement of the yarn Y to the other side in the height direction. Therefore, the yarn Y can be prevented from being sucked into the intake space Ss. Each of the yarn guides 58 is preferably arranged closer to the center of the pair of cell wall surfaces 55 in the height direction. This can reliably prevent the yarn Y from being drawn into the intake space Ss.

The yarn running space S is connected to an intake space Ss formed in the intake duct 32 via the plurality of intake slits 38 (see fig. 4 (b) and 5). The plurality of air intake slits 38 penetrate the duct wall portion 34 in the height direction (see fig. 5), for example, and extend in the unit longitudinal direction (see fig. 4 (b)). The plurality of air intake slits 38 are disposed on the downstream side of the wire running space S and on the upstream side of the air intake space Ss in the flow direction of the cooling air.

In the cooling device 14 as described above, when the negative pressure is generated in the intake space Ss by the negative pressure generating device 33, the cooling air flows mainly from one side to the other side in the height direction in the wire running space S (see the arrow in fig. 5). Further, the cooling air is drawn into the intake space Ss through the intake slit 38. The present inventors focused on reducing the frictional resistance (flow path resistance) of the flow path through which the cooling air flows, as described below, in order to improve the cooling efficiency of the yarn Y in the cooling device 14.

(constitution for improving Cooling efficiency)

Two configurations effective for improving the cooling efficiency will be described. As the configuration 1, the length of each of the pair of cell wall surfaces 55 in the height direction (hereinafter, also simply referred to as wall surface height) is 30mm or less. In other words, the length from the inlet 59 of the yarn running space S to the end portion on the side of the air inlet slit 38 in the height direction is 30mm or less. The inlet 59 is located at the same position in the height direction as the end portions of the pair of cell wall surfaces 55 on one side in the height direction (see fig. 5). The conventional wall height is 34mm, for example. Therefore, the wall surface height in the cooling device 14 is lower than that in the conventional art. Thus, when the wire running space S is regarded as a flow path of the cooling air, the flow path of the cooling air flowing mainly in the height direction becomes shorter in the height direction. Therefore, by reducing the flow path resistance and reducing the pressure loss, the wind speed of the cooling air can be increased compared to the conventional configuration without increasing the output of the negative pressure generating device 33. In addition, as in the present embodiment, when the spacer 57 and the wire guide 58 are provided in the wire running space S, the wall height is preferably 10mm or more from the viewpoint of securing the installation region of the spacer 57 and the wire guide 58.

Next, the 2 nd configuration will be described. For convenience of explanation, a region in which the pair of cell wall surfaces 55 are arranged in the cell longitudinal direction is referred to as a wall surface arrangement region R (see fig. 4). For convenience of explanation, in the wall surface arrangement region R in the unit longitudinal direction, a plurality of regions in the duct wall portion 34 in which the plurality of intake slits 38 are formed are referred to as a formation region R1 (see fig. 7). For convenience of explanation, in the wall surface arrangement region R in the cell longitudinal direction, a plurality of regions other than the formation region R1 are referred to as non-formation regions R2 (see fig. 7). In the cell length direction, the sum of the lengths of the plurality of formation regions R1 is longer than the sum of the lengths of the non-formation regions R2 (see fig. 4 (b)). In other words, the sum of the lengths of the plurality of formation regions R1 is longer than half of the length of the wall surface disposition region R in the cell length direction. This can increase the total of the cross-sectional areas (i.e., opening areas) of the plurality of intake slits 38. Therefore, the flow path resistance in the plurality of air intake slits 38 is reduced to reduce the pressure loss, thereby making it possible to increase the wind speed of the cooling wind.

A specific example of the configuration 2 will be described. For example, the length of the wall surface disposition region R in the cell length direction is 550mm. As shown in fig. 4 (b), 5 air intake slits 38 are formed corresponding to one cooling unit 31. That is, 5 formation regions R1 exist in one wall surface arrangement region R. The length of each formation region R1 in the cell length direction is, for example, 90mm. The total of the lengths of the 5 formation regions R1 in the cell length direction is 450mm. The width (length in the width direction) of each formation region R1 is, for example, 3mm. For example, in one wall surface arrangement region R, there are 6 non-formation regions R2 in addition to 5 formation regions R1. The lengths of the respective non-formation regions R2 in the cell longitudinal direction are substantially equal. The sum of the lengths of the 6 non-formation regions R2 in the unit length direction is designed to be 100mm.

The present inventors have considered that the above-described configurations 1 and 2 can reduce the pressure loss and increase the speed of the cooling air.

(confirmation of Effect relating to improvement of Cooling efficiency)

The present inventors have made the following evaluation relating to improvement in cooling efficiency of the various cooling apparatuses having the above-described configurations 1 and/or 2. The evaluation content and the evaluation result will be described with reference to fig. 8 to 11. Fig. 8 is a table showing the results of evaluation of the wind speed of the cooling wind and the power consumption of each cooling device. Fig. 9 is a graph showing a relationship between the wind speed and the negative pressure of the cooling wind. Fig. 10 is a graph showing a relationship between power consumption of various cooling devices and a wind speed of cooling wind. Fig. 11 is a graph showing a relationship between a difference in the configuration of each cooling device and the wind speed of the cooling wind.

The inventors of the present application mainly performed two evaluations. As evaluation 1, various physical property values were compared between a cooling device having the 1 st configuration and the 2 nd configuration (example in fig. 8 to 10) and a cooling device not having the 1 st configuration and the 2 nd configuration (comparative example in fig. 8 to 10) similarly to the cooling device 14. As the evaluation 2, it was also checked whether or not the cooling effect was improved in the cooling apparatus (not shown) having only one of the configurations 1 and 2 (see fig. 11).

The contents and results of evaluation No. 1 will be described. The inventors of the present application prepared a cooling device (not shown) of an example and a cooling device (not shown) of a comparative example. The cooling device of the embodiment is constituted as follows. With regard to the 1 st configuration, the wall height (the length of the pair of cell walls 55 in the height direction) is 27mm. In the 2 nd configuration, 5 formation regions R1 are provided as in the above-described specific example. The sum of the lengths of the plurality of formation regions R1 in the cell length direction is 450mm. The sum of the lengths of the plurality of non-formation regions R2 in the cell length direction is 100mm.

On the other hand, the cooling device of the comparative example has the following configuration. In the structure 1, the height of the pair of cell wall surfaces (not shown) is 34mm. In the above configuration 2, 9 formation regions (not shown) are provided. The length of each formation region in the cell length direction was 30mm. The sum of the lengths of the plurality of formation regions in the cell length direction was 270mm. Further, 10 non-formation regions (not shown) are provided. The sum of the lengths of the plurality of non-formation regions in the cell length direction was 280mm. That is, in the comparative example, the sum of the lengths of the plurality of formation regions in the cell length direction is equal to or shorter than the sum of the lengths of the plurality of non-formation regions in the cell length direction.

The present inventors operated a known blower (negative pressure generating device 33) in the cooling device of the embodiment and the cooling device of the comparative example, and set conditions for the negative pressure (static pressure) generated in the intake space Ss. More specifically, the inventors of the present invention switched the frequency of the signal to be transmitted to the motor (motor 36) using an inverter (inverter device 37) in order to obtain a predetermined negative pressure. The frequency of the signal is proportional to the rotational speed of the rotating shaft of the motor. The present inventors obtained a time average value of the wind speed (average wind speed) near the entrance 59 of the yarn running space S and a power consumption value of the blower under each condition (see fig. 8). The wind speed of the cooling wind was measured using an Anemo Master (registered trademark of japan kogaku corporation), which is an anemometer manufactured by Kanomax. More specifically, the tip of the probe of the anemometer is disposed near the center of the wire running space S in the unit longitudinal direction. Information on power consumption of the blower is obtained using the inverter. The magnitude of the negative pressure in the intake space Ss is measured using a known pressure gauge. Fig. 8 shows the absolute value (in kPa), the frequency (in Hz), the average wind speed (in m/s), and the power consumption (in kW) of the negative pressure for the examples and comparative examples. Hereinafter, the value of the negative pressure is expressed in absolute value. The larger the absolute value, the stronger the suction force of the blower.

In both examples and comparative examples, the set value of the negative pressure was switched among 3 conditions of 0.3kPa, 0.6kPa, and 1.0 kPa. The higher the set value of the negative pressure is, the higher the frequency is (that is, the higher the rotation speed of the rotating shaft of the motor is). In addition, as the negative pressure becomes larger, the difference in frequency between the example and the comparative example becomes gradually larger. Specifically, when the set value of the negative pressure was 0.3kPa, the frequency in the example and the frequency in the comparative example were both 22Hz. On the other hand, when the set value of the negative pressure is 1.0kPa, the frequency in the example is 42Hz, and the frequency in the comparative example is 46Hz. Namely, the following results were obtained: in the embodiment, the negative pressure of the same magnitude can be generated even if the rotation speed of the rotating shaft of the motor is small as compared with the comparative example. From the result, it is estimated that: in the cooling device of the embodiment, the load on the motor is reduced due to the reduction of the pressure loss by the above-described 1 st and 2 nd configurations.

In the graph of fig. 9, the relationship between the average wind speed and the negative pressure in the example and the comparative example is shown based on the table of fig. 8. The horizontal axis represents negative pressure and the vertical axis represents average wind speed. When the set value of the negative pressure was 0.3kPa, the average wind speed in the comparative example was 0.96m/s, and the average wind speed in the example was 1.77m/s. When the set value of the negative pressure was 0.6kPa, the average wind speed in the comparative example was 1.19m/s, and the average wind speed in the example was 2.57m/s. When the set value of the negative pressure was 1.0kPa, the average wind speed in the comparative example was 1.35m/s, and the average wind speed in the example was 3.07m/s. Under each negative pressure condition, the average wind speed in the example was about 2 times the average wind speed in the comparative example. As a result, a large wind speed can be obtained (i.e., the cooling efficiency is improved) in the embodiment.

In the cooling device of the embodiment, as described above, the average wind speed when the set value of the negative pressure was 0.3kPa was 1.77m/s. This value is larger than the average wind speed (1.35 m/s) when the set value of the negative pressure in the cooling device of the comparative example is 1.0 kPa. As such, in the embodiment, even if the negative pressure is small, a very large wind speed can be obtained (i.e., the cooling efficiency is greatly improved).

The graph of fig. 10 shows the relationship between the power consumption and the average wind speed in the examples and comparative examples based on the table of fig. 8. The horizontal axis represents the average wind speed, and the vertical axis represents the power consumption of the blower (particularly, the motor). For example, in the comparative example, the power consumption required to obtain a wind speed of 1.35m/s was 3.05kW. The frequency at this time was 46Hz. In contrast, in the example, the power consumption required to obtain a wind speed of 1.77m/s was only 0.34kW. The frequency at this time was 22Hz. That is, in the embodiment, the power consumption required to obtain the wind speed of the same level as the conventional wind speed is reduced by about 90% as compared with the conventional wind speed. In general, it is known that the power consumption of a motor capable of changing the rotation speed of a rotating shaft is proportional to the third power of the corresponding rotation speed. Therefore, it is considered that such a significant effect of reducing the power consumption (i.e., a significant improvement in the cooling efficiency) can be obtained.

As described above, in the cooling device according to the embodiment, the wind speed can be increased without increasing the negative pressure, and the power consumption can be reduced. Both of these effects mean an improvement in cooling efficiency. In the embodiment, the wall height is set to 27mm, but if the wall height is lower than the conventional 34mm (for example, 30mm or less), it is expected that the cooling efficiency will be greatly improved. Further, if the height is lower than 27mm, the cooling efficiency can be expected to be further improved.

Next, the contents and results of the 2 nd evaluation will be described. The inventors of the present application also evaluated whether the cooling efficiency is improved in the case where the cooling device 14 has only one of the 1 st configuration (the wall surface height is 30mm or less) and the 2 nd configuration (the sum of the lengths of the formation regions R1 is longer than the sum of the lengths of the non-formation regions R2). The present inventors prepared the following 4 cooling apparatuses. The cooling device of type 1 is the cooling device of the above embodiment, and has both the cooling device of type 1 and the cooling device of type 2. The cooling device of the 2 nd type has only the 1 st configuration (here, the wall height is 27 mm). That is, in the cooling device of type 2, the total of the lengths of the formation region R1 is the same as in the comparative example. The cooling device of the 3 rd type has only the 2 nd configuration. That is, in the cooling device of type 3, the wall height was the same as in the comparative example. The cooling device of the 4 th type is the cooling device of the above comparative example.

The inventors of the present application set the negative pressure in the intake space Ss to be constant, and obtained information on the wind speed of the cooling wind for each of the cooling devices of types 1 to 4. The bar chart of fig. 11 shows the results. The vertical axis represents wind speed. As a summary, in any of the cooling apparatuses of types 1 to 3, a wind speed greater than that of the comparative example (i.e., a high cooling efficiency) can be obtained. That is, it is found that the cooling efficiency can be improved by providing at least one of the above-described configurations 1 and 2.

As described above, the length (wall height) of each of the pair of cell wall surfaces 55 in the height direction is 30mm or less. This shortens the flow path through which the cooling air flows. Therefore, the flow path resistance can be reduced to reduce the pressure loss, and thus a large wind speed can be obtained. Therefore, the cooling efficiency of the yarn Y can be improved.

Further, the sum of the lengths of the formation regions R1 in the cell length direction is longer than the sum of the lengths of the non-formation regions R2 in the cell length direction. Thereby, the sectional area (i.e., the opening area) of the air intake slit 38 can be increased. Therefore, the flow path resistance can be reduced to reduce the pressure loss, and thus a large wind speed can be obtained. Therefore, the cooling efficiency of the yarn Y can be improved.

Further, the gap G in the width direction between the portions facing each other in the width direction in the pair of cell wall surfaces 55 is 1mm or less. In general, if the flow rate of the fluid is the same, the smaller the cross-sectional area of the flow path, the faster the flow velocity of the fluid. However, if the width of the flow path is too narrow, the pressure loss due to the wall surface forming the flow path becomes large, and the flow rate of the fluid becomes small. In this regard, in the present embodiment, the pressure loss caused by the pair of cell wall surfaces 55 can be reduced by reducing the wall surface height. Therefore, even if the gap G is reduced, an increase in pressure loss caused thereby can be suppressed. Therefore, the area of the cross section of the yarn running space S perpendicular to the height direction can be reduced, and the wind speed can be further increased.

The cooling unit 31 has 1 or more yarn guides 58. Since the movement of the yarn Y to the other side in the height direction can be restricted by the yarn guide 58, the yarn Y can be prevented from entering the air intake duct 32. Further, since the yarn guide 58 is disposed at a position distant from the air intake duct 32 in the height direction, the yarn Y can be entirely distant from the air intake duct 32 in the height direction. Therefore, the yarn Y can be reliably prevented from entering the intake space Ss.

In the present embodiment, the yarn Y can be advanced while being alternately brought into contact with the contact body 56a and the contact body 56b. Thereby, the movement of the yarn Y in the width direction is restricted. Further, the yarn Y can be cooled more efficiently by bringing the yarn Y into contact with the contact body 56a or the contact body 56b cooled by the cooling air.

Further, the negative pressure generating device 33 generates cooling air from the wire running space S toward the intake space Ss. In general, an oil agent is applied to the yarn Y to smoothly move the yarn Y. Therefore, for example, in a configuration in which the cooling air is supplied from the pipe interior space to the wire running space S, the oil agent may be scattered to the external space (more specifically, the working space Sw). In this regard, in the present embodiment, since the cooling air is sucked into the intake space Ss, the problem of the oil agent scattering can be avoided.

The negative pressure generator 33 includes an impeller 35, a motor 36, and an inverter 37. In the cooling device 14 having improved cooling efficiency, the inverter device 37 reduces the rotation speed of the rotating shaft of the motor 36 compared to the conventional one, thereby achieving a desired wind speed and significantly reducing the power consumption of the negative pressure generator 33.

Further, the cooling device 14 can effectively cool the yarn Y, and the cooling device 14 can be downsized and/or reduce power consumption. The entire false twisting machine 1 can be downsized and/or the power consumption can be reduced while ensuring good quality of the yarn Y processed by the false twisting machine 1.

Next, a modification of the above embodiment will be described. However, the same reference numerals are given to the same components as those of the above-described embodiment, and the description thereof will be omitted as appropriate.

(1) In the above embodiment, the distance G in the width direction between the portions facing each other in the width direction in the pair of cell wall surfaces 55 is 1mm or less. However, the present invention is not limited thereto. The spacing G may also be greater than 1mm.

(2) In the above embodiments, the cooling unit 31 includes the contact 56a and the contact 56b. However, the present invention is not limited thereto. It is not necessary to provide the contact 56a and the contact 56b.

(3) In the above-described embodiments, the end portions on one side of the 1 or more yarn guides 58 are arranged on the side closer to the center of the pair of cell wall surfaces 55 in the height direction. However, the present invention is not limited thereto. One end of the 1 or more yarn guides 58 may be disposed on the other side of the center of the pair of cell wall surfaces 55.

(4) In the above embodiments, the cooling unit 31 has 1 or more yarn guides 58. However, the present invention is not limited thereto. The wire guide 58 need not be provided. In this configuration, it is not necessary to secure an area for disposing the wire guide 58. Therefore, the wall height may be lower than 10 mm. The wall height may be, for example, 5mm. In addition, in this configuration, in order to prevent the yarn Y from being sucked into the intake space Ss, it is preferable to take some measures.

(5) In the above embodiments, the cooling unit 31 has the spacer 57. However, the present invention is not limited thereto. Instead of the spacer 57, the positional relationship between the cell wall surface 55a and the cell wall surface 55b in the width direction may be defined by a positioning member (not shown).

(6) In the above-described embodiments, the cooling unit 31 includes a pair of unit wall plates 51 formed by sheet metal working. However, the present invention is not limited thereto. As a configuration corresponding to the pair of cell walls of the present invention, a pair of block members (not shown) may be provided, for example, by cutting, instead of the pair of cell walls 51. A pair of wall surfaces corresponding to the pair of cell wall surfaces 55 may be formed in the pair of block members. In this case, the pair of wall surfaces may be formed to be substantially linear in a cross section orthogonal to the cell longitudinal direction, unlike the pair of cell wall surfaces 55 having curved surfaces.

Alternatively, the pair of wall surfaces corresponding to the pair of cell wall surfaces 55 may be formed by, for example, cutting a single block-shaped member. In this case, the spacer 57 or the positioning member (not shown) may not be provided.

Alternatively, the pair of wall surfaces corresponding to the pair of cell wall surfaces 55 may be formed by, for example, cutting a part of the duct wall 34. In this case, the wall height can be further reduced. The wall height may be 1mm, for example. In this case, the spacer 57 or the positioning member (not shown) may not be provided.

(7) In the above-described embodiments, the duct wall portion 34 is provided with a plurality of intake slits 38 corresponding to one cooling unit 31. However, the present invention is not limited thereto. For example, one elongated air intake slit (not shown) may be provided corresponding to one cooling unit 31. Further, the single air intake slit may be formed over the entire wall surface disposition region R in the cell longitudinal direction. Such a configuration is also included in the configuration of the present invention in which the sum of the lengths of the 1 or more formation regions is longer than the sum of the lengths of the regions other than the 1 or more formation regions.

(8) In the above-described embodiments, the negative pressure generating device 33 includes the motor 36 as an ac motor and the inverter device 37. However, the present invention is not limited thereto. Instead of the motor 36, for example, a dc motor not shown may be provided. In addition, the rotation speed of the rotating shaft of the motor may be changed by changing the magnitude of the voltage applied to the dc motor.

(9) In the above-described embodiments, the negative pressure generating device 33 is configured to be able to change the rotation speed of the rotating shaft of the motor 36 (or a dc motor (not shown)). However, the present invention is not limited thereto. The negative pressure generating device 33 may have a power transmission mechanism (not shown) disposed between the rotary shaft and the impeller 35 in a transmission direction of power to the impeller, for example. The power transmission mechanism may have a plurality of gears, not shown, and may be configured to be capable of switching gear ratios. With this configuration, the magnitude of the generated negative pressure can be changed by switching the rotation speed of the impeller 35.

(10) In the above embodiments, the negative pressure generating device 33 is a blower. However, the present invention is not limited thereto. As the negative pressure generating device of the present invention, for example, a fan not shown or an aspirator not shown may be provided.

(11) In the above-described embodiments, the negative pressure generating device 33 generates a negative pressure in the intake space Ss (the duct space), thereby supplying the cooling air to the wire running space S. However, the present invention is not limited thereto. Instead of the negative pressure generator 33, a device may be provided that generates a positive pressure (a pressure higher than the air pressure in the space outside the cooling device 14) in the pipe space. In this case, the cooling air is supplied from the duct space to the filament running space S. In this case, the pressure loss can be reduced by reducing the flow path resistance. In this configuration, the cooling wind is blown out toward the working space Sw. When the cooling wind is blown out toward the work space Sw, the oil agent may be scattered into the work space Sw as described above. Therefore, in such a configuration, a scattering prevention device (not shown) configured to prevent the oil from scattering into the working space Sw may be provided.

(12) The cooling device 14 is not limited to the false twisting machine 1, and can be applied to a known false twisting machine (not shown) having another configuration. For example, the present invention can be applied to a false twist processing machine (not shown) described in japanese patent application laid-open No. 2009-74219. The false twist processing machine is configured to be capable of doubling 2 yarns to form 1 yarn. The false twist processing machine is configured to be able to wind 1 yarn after doubling or 2 yarns without doubling on a single cradle. The present invention can be applied to such a false twist processing machine as an example. Alternatively, the cooling device 14 may be applied to a yarn processing machine that performs processing while running a yarn (not shown), such as a known air processing machine (not shown), in addition to the false twist processing machine.

Claims (10)

1. A cooling device configured to cool a running yarn by cooling air, comprising:

a cooling unit formed such that a yarn running space in which the yarn runs extends in a predetermined longitudinal direction; and

a duct in which a space in the duct connected to the space through which the yarn travels is formed,

the duct has a duct wall portion formed with 1 or more slits arranged between the yarn running space and the duct space in a flow direction in which the cooling air flows and extending in the longitudinal direction,

the cooling unit has a pair of unit wall portions arranged on one side of the duct wall portion in a height direction orthogonal to the longitudinal direction,

the pair of cell wall portions have a pair of cell wall surfaces that are arranged on opposite sides of each other across the yarn running space in a width direction orthogonal to both the longitudinal direction and the height direction,

the length of each of the pair of cell wall surfaces in the height direction is 30mm or less.

2. A cooling device configured to cool a running yarn by cooling air, comprising:

a cooling unit formed such that a yarn running space in which the yarn runs extends in a predetermined longitudinal direction; and

a duct in which a space in the duct connected to the space through which the yarn travels is formed,

the duct has a duct wall portion formed with 1 or more slits arranged between the wire running space and the duct space in a flow direction in which the cooling air flows and extending in the longitudinal direction,

the cooling unit has a pair of unit wall portions arranged on one side of the duct wall portion in a height direction orthogonal to the longitudinal direction,

the pair of cell wall portions have a pair of cell wall surfaces that are arranged on opposite sides of the yarn running space in a width direction perpendicular to both the longitudinal direction and the height direction,

in the longitudinal direction, in a wall surface arrangement region in which the pair of cell wall surfaces are arranged, a total length of 1 or more formation regions in the duct wall portion in which the 1 or more slits are formed is longer than a total length of regions other than the 1 or more formation regions.

3. The cooling device according to claim 1,

in the longitudinal direction, in a wall surface arrangement region in which the pair of cell wall surfaces are arranged, a total length of 1 or more formation regions in the duct wall portion in which the 1 or more slits are formed is longer than a total length of regions other than the 1 or more formation regions.

4. The cooling apparatus according to claim 1 or 3,

the distance between the pair of cell wall surfaces facing each other in the width direction is 1mm or less in the width direction.

5. The cooling device according to any one of claims 1 to 4,

the cooling unit includes 1 or more yarn guides, and the 1 or more yarn guides are disposed in the yarn running space and configured to restrict movement of the yarn to the other side in the height direction.

6. The cooling apparatus according to claim 5,

the one end of the 1 or more thread guides is disposed closer to the one side than a center of the pair of cell wall surfaces in the height direction.

7. The cooling device according to any one of claims 1 to 6,

the cooling unit includes:

a 1 st contact portion provided on a part of one of the pair of cell wall surfaces and contacting the thread; and

and a 2 nd contact portion provided on a part of the other of the pair of cell wall surfaces, disposed at a position different from the 1 st contact portion in the longitudinal direction, and configured to be contacted by the wire.

8. The cooling device according to any one of claims 1 to 7,

the negative pressure generating device is configured to generate a negative pressure in the space in the duct.

9. The cooling apparatus according to claim 8,

the negative pressure generating device includes:

an impeller configured to be rotatable;

a motor configured to rotationally drive the impeller; and

and a rotation speed changing unit configured to be capable of changing a rotation speed of a rotation shaft of the motor.

10. A yarn processing machine is characterized by comprising:

the cooling device of any one of claims 1 to 9;

a yarn deformation applying device configured to apply deformation to the yarn; and

a yarn feeding device configured to feed the yarn to the cooling device and the yarn deformation applying device to advance the yarn,

the yarn processing machine is configured to perform processing while advancing the yarn.

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