Textile waste recovery device and false twisting machine

Abstract

Effectively suppresses the noise of air being discharged from the cyclone separator. [Solution] The cyclone separator 30 separates fiber debris from the air, discharges the separated fiber debris into a fiber debris collection container, and discharges the air from which the fiber debris has been separated from the air discharge section 50. The cyclone separator 30 is equipped with an exhaust noise suppressor 60 to suppress the noise of the air discharged from the air discharge section 50. The exhaust noise suppressor 60 has a main body 64 which is a substantially cylindrical member in which a flow channel space Sf is formed that extends in the flow direction from one end to the other end connected to the air discharge section 50. The main body 64 has a plurality of retention spaces Ss formed outside the flow channel space Sf in a direction perpendicular to the flow direction, and the plurality of retention spaces Ss are arranged in the flow direction and include at least two retention spaces Ss with different volumes from each other.

Description

Technical Field

[0001] The present invention relates to a fiber waste collection device that separates and collects fiber waste from air, and a false twisting machine equipped with the fiber waste collection device.

Background Art

[0002] Conventionally, a false twisting machine is known that applies false twisting treatment to a yarn supplied from a yarn supply package, and winds the yarn with a winding device to form a wound package. Patent Document 1 discloses a fiber waste collection device that sucks the continuously supplied yarn and collects it as fiber waste when performing a yarn threading operation in a false twisting machine or performing a package replacement operation in a winding device. Such a fiber waste collection device includes a fiber waste transfer pipe (pipe) through which fiber waste sucked from a suction portion flows together with air, a fiber waste collection portion that collects the fiber waste sent by the fiber waste transfer pipe, and a cyclone separator that is provided between the fiber waste transfer pipe and the fiber waste collection portion and separates the fiber waste sent by the fiber waste transfer pipe from air. The cyclone separator sends the fiber waste separated from the air to the fiber waste collection portion, and discharges the air after the fiber waste is separated to the outside from an air discharge portion. In this way, since the fiber waste separated from the air is sent to the fiber waste collection portion, the fiber waste collection portion can be made smaller compared to the case where fiber waste is collected without separating air.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of Invention

Problem to be Solved by the Invention

[0004] In the fiber waste collection device as described above, discharge noise of air from the cyclone separator is generated. In order to suppress deterioration of the working environment, it is required to effectively suppress such air discharge noise.

[0005] The object of the present invention is to provide a fiber waste recovery device and a false twisting machine that can effectively suppress the noise of air discharged from a cyclone separator while maintaining the separation performance of the cyclone separator. [Means for solving the problem]

[0006] The first invention relates to a fiber waste collection device comprising: a pipe through which fiber waste flows with air; a fiber waste collection unit for collecting the fiber waste sent by the pipe; and a cyclone separator provided between the pipe and the fiber waste collection unit for separating the fiber waste from the air sent by the pipe and discharging the separated fiber waste to the fiber waste collection unit, wherein the cyclone separator is provided with an air discharge unit having an opening through which the air from which the fiber waste has been separated flows out, and is equipped with an exhaust noise suppressor for suppressing the sound of the air discharged from the air discharge unit, the exhaust noise suppressor having a tubular portion which is a tubular member having a flow path space formed therein that extends in the flow direction from one end connected to the air discharge unit toward the other end, the tubular portion having a plurality of retention spaces formed outside the flow path space in a direction perpendicular to the flow direction, the plurality of retention spaces being arranged in the flow direction and including a first retention space and a second retention space having different volumes from each other.

[0007] Furthermore, "tubular member" refers to a hollow, elongated member. "Tubular member" includes so-called "cylindrical members" that are hollow and extend in one direction. A "tubular member" may be curved in part or entirely.

[0008] Furthermore, the area of ​​the cross-sectional area perpendicular to the flow direction of the flow channel space is equal to the area of ​​the inlet for air from the cyclone separator into the tubular section.

[0009] In this invention, the exhaust noise suppressor reduces the flow velocity of air flowing through the tubular section by retaining a portion of the air from the cyclone separator's air discharge section within the tubular section using a retention space. This attenuates the air's energy and suppresses the exhaust noise from the cyclone separator. The inventors of this application, through diligent research, have concluded that there is a relationship between the volume of the retention space and the frequency of sound that can be suppressed. In this invention, sounds of different frequencies can be suppressed by using a first retention space and a second retention space with different volumes. Therefore, the exhaust noise of air can be effectively suppressed.

[0010] In the fiber waste collection device according to the second invention, in the first invention, the tubular portion has a plurality of protrusions that protrude from its inner wall surface and extend in a direction intersecting the flow direction, and are aligned in the flow direction, and each retention space is a space defined by two adjacent protrusions in the flow direction and the inner wall surface between the two protrusions.

[0011] This invention makes it possible to create a retention space for air with a relatively simple configuration.

[0012] In the fiber waste collection device according to the third invention, in the second invention, the projection has an upstream surface in the flow direction that extends from the inner wall surface toward the downstream side in the flow direction.

[0013] In this invention, as will be described in detail later with reference to the drawings, air from the cyclone separator is guided by the upstream surface of the projection in the direction of flow, making it easier for the air to flow into the stagnant space. Therefore, more air can be taken into the stagnant space, and thus the noise of air discharge can be suppressed more effectively.

[0014] The fiber waste collection device according to the fourth invention is characterized in that, in the second or third invention, the distance between the two protrusions defining the first retention space is different from the distance between the two protrusions defining the second retention space.

[0015] In this invention, the volumes of the first retention space and the second retention space can be made different with a relatively simple configuration.

[0016] In the fiber waste collection device according to the fifth invention, in any of the second to fourth inventions, the cross-sectional area of ​​the tubular portion in a section perpendicular to the flow direction of its internal space is different in the portion where the first retention space is provided and in the portion where the second retention space is provided.

[0017] In this invention, the volumes of the first retention space and the second retention space can be made different by partially changing the cross-sectional area of ​​the internal space of the tubular portion.

[0018] In the fiber waste collection device according to the sixth invention, in any of the second to fifth inventions, the projection has a shape that does not overlap with the inner wall surface when viewed from a direction perpendicular to the inner wall surface within the tubular portion.

[0019] In this invention, as will be explained in detail later with reference to the drawings, the shape of the protrusion is such that it can be formed with a relatively simple mold when the tubular portion is formed by mold processing.

[0020] In the fiber waste collection device according to the seventh invention, in any of the first to sixth inventions, the first retention space has a volume greater than the volume of the second retention space and is located upstream of the second retention space in the flow direction.

[0021] When a plurality of retention spaces with different volumes are provided in a tubular portion, air from the cyclone separator tends to flow into the retention space with a larger volume. Therefore, when the retention space with a smaller volume is located on the upstream side (near side) in the flow direction, and the retention space with a larger volume is located on the downstream side (far side) in the flow direction, the air from the cyclone separator does not flow much into the small-volume retention space on the near side, but flows into the large-volume retention space on the far side. As a result, the small-volume retention space cannot be effectively utilized. In the present invention, of the first retention space and the second retention space, the first retention space having a larger volume is located on the upstream side in the flow direction relative to the second retention space, so the air from the cyclone separator first flows into the first retention space located on the near side, and then flows into the second retention space located on the far side. Accordingly, since all the retention spaces can be effectively utilized, the air discharge noise can be further effectively suppressed.

[0022] In the fiber waste collection device according to the eighth invention, in the seventh invention, the plurality of retention spaces are arranged in the flow direction such that, for every pair of two adjacent retention spaces in the flow direction, the volume of the retention space located on the upstream side in the flow direction is equal to or larger than the volume of the retention space located on the downstream side in the flow direction.

[0023] In the present invention, the plurality of retention spaces are arranged such that a retention space with a larger volume is positioned more toward the upstream side in the flow direction. Therefore, the air from the air discharge unit first flows into the retention space located at the most near side, and sequentially flows into the retention spaces on the far side. As a result, since all the retention spaces can be effectively utilized, the air discharge noise can be even more effectively suppressed.

[0024] A false twisting machine according to the ninth invention is provided with the fiber waste collection device according to any one of the first to eighth inventions.

[0025] In the present invention, the discharge noise of air from the cyclone separator can be effectively suppressed. [Brief Description of the Drawings]

[0026] [Figure 1]This is a schematic diagram showing an example of a false twisting machine as a textile machine equipped with a fiber waste collection device. [Figure 2] This is a schematic diagram showing an example of a fiber waste collection device according to one embodiment of the present invention. [Figure 3] This is a perspective view showing an example of a cyclone separator. [Figure 4] This is a perspective view showing an example of a cyclone separator with a discharge noise suppressor attached thereto. [Figure 5] This is a cross-sectional view of the discharge noise suppressor and its vicinity taken along a plane parallel to the vertical direction. [Figure 6] This is a diagram for explaining the process of forming the part that serves as the main body of the discharge noise suppressor, where (a) is a perspective view of the part, and (b) is a cross-sectional view of the part. [Figure 7] This is a diagram for explaining the principle by which discharge noise is suppressed. [Figure 8] This is a table showing the conditions in the comparative test of Example 1 and Comparative Examples 1 to 8. [Figure 9] This is a graph showing the noise measurement results when using each discharge noise suppressor according to Example 1 and Comparative Examples 1 to 8. [Figure 10] This is a table showing the conditions in the comparative test of Examples 1 to 6. [Figure 11] This is a graph showing the noise measurement results when using each discharge noise suppressor according to Examples 1 to 6. [Figure 12] This is a cross-sectional view of a discharge noise suppressor according to a modified example, taken along a plane parallel to the vertical direction. [Mode for Carrying Out the Invention]

[0027] Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings. In the following description, the fiber waste collection device of the present invention will be described as being installed in a false twisting machine. The fiber waste collection device of the present invention can also be applied to textile machines other than false twisting machines.

[0028] (False Twisting Machine) First, the overall configuration of the false twisting machine 101 will be explained with reference to Figure 1. For the sake of explanation, the vertical direction in Figure 1 will be considered the vertical direction of the false twisting machine 101 (the vertical direction in which gravity acts). The horizontal direction in Figure 1 will be considered the horizontal direction of the false twisting machine 101. The vertical direction in Figure 1 will be considered the front-to-back direction of the false twisting machine 101. Both the horizontal and front-to-back directions are aligned with the horizontal direction. The horizontal and front-to-back directions are perpendicular to each other.

[0029] The false twisting machine 101 is configured as a textile machine that applies false twist to thermoplastic synthetic fibers such as polyester or polyamide to impart crimp and produce a highly elastic processed yarn. The false twisting machine 101 mainly comprises a yarn feeding section 103 for supplying yarn Y, a processing section 105 for false twisting the yarn Y supplied from the yarn feeding section 103, and a winding section 107 for winding the yarn Y processed in the processing section 105 onto a winding bobbin Bw.

[0030] The yarn feeding section 103 has a yarn feeding creel 104 that holds multiple yarn feeding packages Ps and supplies multiple yarns Y to the processing section 105. The processing section 105 is configured with the following components arranged in order from the upstream side in the direction in which the yarn Y travels: a first feed roller 108, a shifter guide 109, a first heating device 110, a cooling device 111, a false twisting device 106, a second feed roller 112, an interlacing nozzle 113, a second heating device 114, a third feed roller 115, and an oiling roller 116. The winding section 107 has multiple winding devices 117. Each winding device 117 winds the yarn Y processed in the processing section 105 to form a winding package Pw.

[0031] The false twisting machine 101 has a yarn supply creel 104 and a main machine base 102 that is spaced apart in the left-right direction. The main machine base 102 extends in the vertical direction. The main machine base 102 is fitted with the second heating device 114 of the processing section 105 and the devices that constitute the winding section 107. The main machine base 102 and the yarn supply creel 104 are positioned opposite each other in the left-right direction. The space between the main machine base 102 and the yarn supply creel 104 is a workspace So for the operator to perform tasks such as threading on each device.

[0032] The first feed roller 108 is positioned above the work space So. The first heating device 110 is positioned above the work space So, and even higher than the first feed roller 108. The cooling device 111 is positioned above the work space So, closer to the main machine base 102 than the first heating device 110. The first heating device 110 and the cooling device 111 are positioned above the work space So, extending diagonally upward while moving away from the main machine base 102. The shifter guide 109 is positioned between the first feed roller 108 and the first heating device 110 in the vertical direction, and is used to pass the yarn Y through the inside of the first heating device 110 and the cooling device 111 when threading yarn into the false twisting machine 101.

[0033] The false twisting device 106 and the second feed roller 112 are located above the main machine base 102. The interlacing nozzle 113 is located above the main machine base 102, but below the false twisting device 106 and the second feed roller 112. The second heating device 114, the third feed roller 115, and the oiling roller 116 are provided on the main machine base 102. Each device constituting the winding section 107 is mounted on the working space So side of the main machine base 102. With each device laid out in this way, the yarn path from the yarn feeding section 103 to the winding section 107 is formed to surround the working space So.

[0034] In the winding section 107, four winding devices 117 are provided in the vertical direction. Furthermore, multiple winding devices 117 are arranged in the front-to-back direction in each of the first to fourth stages. Near each winding device 117, a suction section 15 is provided that can suck up and hold the yarn Y supplied from the yarn supply package Ps.

[0035] In the false twisting machine 101, the yarn Y supplied from the yarn supply package Ps is fed from the upstream to the downstream side in the yarn travel direction by the first to third feed rollers (108, 112, 115). The yarn feed speeds of each are set such that the yarn feed speed of the second feed roller 112 is faster than the yarn feed speed of the first feed roller 108. As a result, the yarn Y is stretched between the first feed roller 108 and the second feed roller 112. In addition, the yarn feed speeds of each are set such that the yarn feed speed of the third feed roller 115 is slower than the yarn feed speed of the second feed roller 112. As a result, the yarn Y is relaxed between the second feed roller 112 and the third feed roller 115.

[0036] The yarn Y, stretched between the first feed roller 108 and the second feed roller 112, is then twisted and fed by a false twisting device 106, which is, for example, a friction disc type twister. The twist formed in the false twisting device 106 propagates to the first feed roller 108, and the yarn Y, which is stretched and twisted, is heated in the first heating device 110 and then cooled in the cooling device 111 to fix the twist. After passing through the false twisting device 106, the twisted and heat-fixed yarn Y is untwisted before reaching the second feed roller 112.

[0037] In this manner, the stretched false-twisted yarn Y has appropriate entanglement formed in the interlacing nozzle 113, thereby providing it with bundling properties. Subsequently, the yarn Y is subjected to relaxation heat treatment in the second heating device 114 and wound onto the winding bobbin Bw by the winding device 117 via the oiling roller 116. When the winding package Pw formed by winding the yarn Y onto the winding bobbin Bw is fully wound, it is removed from the winding device 117 by an operator. Then, a new winding bobbin Bw is attached to the winding device 117 by an operator, and the winding of yarn Y onto the winding bobbin Bw is resumed. When replacing the winding package Pw, the yarn Y that continues to be supplied from the yarn supply package Ps can be entrusted to the suction unit 15. This eliminates the need to cut the yarn Y when replacing the winding package Pw, allowing the false-twisting machine 101 to continue operating.

[0038] The fiber waste collection device of this embodiment is installed and used in the false twisting machine 101 described above. The fiber waste collection device of this embodiment will be described below.

[0039] (Overview of the textile waste collection system) As described above, when replacing the winding package Pw in the winding device 117, or when threading the yarn in the false twisting machine 101, the yarn Y continuously supplied from the yarn supply package Ps can be deposited into the suction unit 15. The fiber waste recovery device 1 is used to recover the yarn Y continuously supplied from the yarn supply package Ps as fiber waste from the suction unit 15. Note that "fiber waste" includes fiber waste of relatively short length, fiber waste formed from aggregates of relatively short fiber waste, and yarn waste of relatively long length. The general configuration of the fiber waste recovery device 1 will be described below with further reference to Figure 2.

[0040] As shown in Figure 2, the fiber waste collection device 1 mainly comprises a plurality of pipes 11, a single fiber waste collection container 13 provided in common to the plurality of pipes 11, a plurality of cyclone separators 30, one for each of the plurality of pipes 11, and a plurality of noise suppressors 60, one for each of the plurality of cyclone separators 30. In each pipe 11, the yarn Y (fiber waste) sucked in by the suction section 15 flows along with the air. The fiber waste collection container 13 collects the fiber waste sent by each pipe 11. Each cyclone separator 30 is positioned between the corresponding pipe 11 and the fiber waste collection container 13. Each cyclone separator 30 separates the fiber waste from the air sent by the pipes 11 and discharges the separated fiber waste into the fiber waste collection container 13. The noise suppressors 60 are for suppressing the noise emitted when the air from which the fiber waste has been separated is discharged to the outside from the cyclone separators 30. The fiber waste collection container 13 corresponds to the "fiber waste collection unit" of the present invention.

[0041] The pipes 11 are, for example, hollow cylindrical tubes. Multiple pipes 11 are arranged corresponding to each stage of the winding devices 117 which are arranged vertically in the false twisting machine 101. The fiber waste collection device 1 of this embodiment, used in a false twisting machine 101 with four stages of winding devices 117, is equipped with four pipes 11. Each pipe 11 is arranged to extend in the front-to-back direction. One end of each pipe 11 in the front-to-back direction (the rear end shown in Figure 2) is closed, and the other end in the front-to-back direction (the front end shown in Figure 2) is connected to the cyclone separator 30.

[0042] As shown in Figure 2, multiple branch pipes 16 branch off from each pipe 11. The base ends of the multiple branch pipes 16 branching off from each pipe 11 are aligned along the longitudinal direction (front-to-back direction) of the pipe 11. A suction section 15 is provided at the tip of each branch pipe 16. In other words, each pipe 11 is provided with multiple suction sections 15 via multiple branch pipes 16. The multiple suction sections 15 provided on each pipe 11 are multiple suction sections 15 that are respectively located near multiple winding devices 117 on the stage where the pipe 11 is located. Each branch pipe 16 is connected to the pipe 11 at an oblique angle. Specifically, the tip of each branch pipe 16 where the suction section 15 is provided is located further back than the base end connected to the pipe 11.

[0043] Each branch pipe 16 is configured to allow compressed air supplied from a compressed air supply source (not shown) to be injected into its interior. In each branch pipe 16, compressed air is injected from a portion of the branch pipe 16 toward the piping 11. The compressed air injected into the branch pipe 16 generates an airflow within the branch pipe 16 that sends the fiber debris toward the piping 11, and consequently generates an airflow within the piping 11 that sends the fiber debris toward the cyclone separator 30 (front side in Figure 2). This airflow allows the suction unit 15 to suck up the yarn Y, and the sucked-up yarn Y to be sent to the cyclone separator 30 as fiber debris.

[0044] (Cyclone separator) Next, the configuration of the cyclone separator 30 will be described with further reference to Figure 3. The cyclone separator 30 separates the air containing fiber debris sent through the piping 11 into fiber debris and clean air after the fiber debris has been separated. The fiber debris separated from the air is discharged into the fiber debris collection container 13 (see Figure 2). The clean air after the fiber debris has been separated is discharged from the air discharge section 50. Note that the cyclone separator 30 does not completely separate the air and fiber debris, and air is still present in the fiber debris after the air has been separated. Therefore, not only the fiber debris but also the unseparated air is discharged into the fiber debris collection container 13 along with the fiber debris.

[0045] By equipping the cyclone separator 30, the fiber waste can be discharged in a clump-like form, thereby reducing the volume occupied by the fiber waste inside the fiber waste collection container 13. Furthermore, by separating the fiber waste from the air using the cyclone separator 30 and discharging the remaining air from the air discharge section 50, the amount of air sent to the fiber waste collection container 13 is reduced, thereby reducing the volume occupied by the air inside the fiber waste collection container 13. Therefore, the fiber waste collection container 13 can be made smaller compared to a system without the cyclone separator 30.

[0046] As shown in Figure 3, the cyclone separator 30 mainly comprises a main body 32, a tapered section 42 provided below the main body 32, a fiber waste discharge section 46 that discharges the fiber waste separated from the air into a fiber waste collection container 13 (see Figure 2), and an air discharge section 50 that discharges the air after the fiber waste has been separated.

[0047] The main body 32 is cylindrical, extending vertically and open at both ends. A pipe 11 is connected to the upper end of the main body 32. The pipe 11 is connected to the main body 32 such that its longitudinal direction aligns with the inner surface of the main body 32. Therefore, the air containing fiber debris sent to the main body 32 by the pipe 11 flows circumferentially along the inner surface of the main body 32. As a result, the fiber debris contained in the air is sent downward while rotating circumferentially along the inner surface of the main body 32 due to centrifugal force, or centrifugal separation. The air after the fiber debris has been separated flows out from the opening at the upper end of the main body 32.

[0048] The tapered portion 42 extends vertically and is a frustoconical tube with open ends. The diameter of the upper end of the tapered portion 42 is larger than the diameter of the lower end. That is, in a front view, the tapered portion 42 tapers from the upper end to the lower end. The size of the inner diameter of the upper end of the tapered portion 42 is the same as the inner diameter of the main body portion 32. The tapered portion 42 is connected to the lower end of the main body portion 32 at its upper end. The inside of the main body portion 32 and the inside of the tapered portion 42 are in communication.

[0049] The fiber waste discharge section 46 is cylindrical with open ends. The fiber waste discharge section 46 extends downward from the lower end of the tapered section 42. The inner diameter of the fiber waste discharge section 46 and the inner diameter of the lower end of the tapered section 42 are the same. The inside of the tapered section 42 and the inside of the fiber waste discharge section 46 are in communication. The fiber waste discharge section 46 is also connected to the fiber waste collection container 13 (see Figure 2) at its lower end.

[0050] The air discharge section 50 is cylindrical, extending vertically and open at both ends. A flange 51 is provided at the lower end of the air discharge section 50. The outer circumference of the flange 51 is circular, with a diameter approximately the same as that of the main body section 32. The air discharge section 50 is connected to the upper end of the main body section 32 at the edge of the flange 51, so as to be concentric with the main body section 32. The inside of the main body section 32 and the inside of the air discharge section 50 are in communication. The air from which the fiber debris has been separated in the main body section 32 is sent to the air discharge section 50 and flows out from the opening 50a at the upper end. As will be described later, a noise suppressor 60 (see Figure 2) is attached to the air discharge section 50, and the air sent to the air discharge section 50 is discharged to the outside via the noise suppressor 60.

[0051] In the cyclone separator 30, air containing fiber debris is sent to the main body 32 via piping 11. At this time, the fiber debris contained in the air is sent downward along the inner surface of the main body 32 by the action of centrifugal force, and further sent along the inner surface of the tapered section 42 toward the fiber debris discharge section 46. The fiber debris sent toward the fiber debris discharge section 46 is discharged from the fiber debris discharge section 46 to the fiber debris collection container 13 (see Figure 2). In this way, the fiber debris is separated from the air containing fiber debris sent via piping 11, and the separated fiber debris is collected in the fiber debris collection container 13. Meanwhile, the air after the fiber debris has been separated is sent from the main body 32 to the air discharge section 50 and discharged to the outside via a noise suppressor 60, which will be described later.

[0052] (Emission sound suppressor) Next, the configuration of the exhaust noise suppressor 60 will be described with further reference to Figure 5. As shown in Figures 4 and 5, the exhaust noise suppressor 60 is attached to the air discharge section 50 of the cyclone separator 30. The exhaust noise suppressor 60 has the function of preventing fiber debris from being discharged to the outside from the cyclone separator 30, and the function of suppressing the noise of air discharged from the cyclone separator 30. The exhaust noise suppressor 60 mainly consists of a mounting section 61 and a main body section 64.

[0053] The mounting portion 61 is cylindrical in shape and extends vertically. The outer diameter of the mounting portion 61 is slightly smaller than the inner diameter of the air discharge portion 50, and the mounting portion 61 is fitted inside the air discharge portion 50. The mounting portion 61 may also be configured to be fitted outside the air discharge portion 50. When the mounting portion 61 is fitted into the air discharge portion 50, it is preferable that the gap between the mounting portion 61 and the air discharge portion 50 be as small as possible. The length of the mounting portion 61 along the vertical direction is approximately the same as the length of the air discharge portion 50 along the vertical direction. As shown in Figure 5, when the mounting portion 61 is fitted into the air discharge portion 50, the upper end of the mounting portion 61 is located at the upper end of the air discharge portion 50. The lower end of the mounting portion 61 is located at the lower end of the air discharge portion 50. The air flowing from the main body 32 of the cyclone separator 30 toward the air discharge section 50 flows into the mounting section 61 of the exhaust noise suppressor 60, which is located inside the air discharge section 50.

[0054] As shown in Figure 5, a shielding cover 62 is attached to the lower end of the mounting portion 61. The shielding cover 62 is intended to prevent fiber debris that could not be carried by the flow moving downward along the inner circumferential surface in the main body portion 32 of the cyclone separator 30 from being discharged to the outside via the air discharge portion 50. The shielding cover 62 is configured to partially block the flow path from the air discharge portion 50 to the outside. Multiple holes 62a are formed in the shielding cover 62 that penetrate in the vertical direction. The shielding cover 62 blocks the discharge of fiber debris to the outside while maintaining the discharge of air from the air discharge portion 50 to the outside. A flange portion 63 is provided at the upper end of the mounting portion 61. The outer circumference shape of the flange portion 63 is circular, with a diameter larger than the diameter of the air discharge portion 50.

[0055] The main body portion 64 is substantially cylindrical in shape and extends vertically. The length of the main body portion 64 along the vertical direction is denoted as the total length L. The main body portion 64 corresponds to the "tubular portion" of the present invention. The main body portion 64 has approximately the same diameter as the flange portion 63. The main body portion 64 is connected to the edge of the flange portion 63 at its lower end so as to be concentric with the mounting portion 61. The inside of the mounting portion 61 and the inside of the main body portion 64 are in communication. At its lower end, the internal space of the main body portion 64 is connected to the internal space of the air discharge portion 50. As a result, air from the cyclone separator 30 flows into the main body portion 64 via the mounting portion 61 (air discharge portion 50) and flows from the lower end to the upper end of the main body portion 64. That is, the direction of air flow in the main body portion 64 (hereinafter simply referred to as the "flow direction") is from bottom to top. The upper end of the mounting portion 61 serves as an inlet 66a for air from the cyclone separator 30 into the main body portion 64. The upper end of the main body portion 64 serves as an outlet 66b for air from the main body portion 64 to the outside.

[0056] The main body 64 has a flow channel space Sf (shown as a dashed line in Figure 5) that extends in the direction of flow. The flow channel space Sf extends from the inlet 66a to the outlet 66b. The area of ​​the cross-section of the flow channel space Sf perpendicular to the direction of flow is equal to the area of ​​the inlet 66a. When viewed from above, the entire flow channel space Sf overlaps with the entire inlet 66a. In addition, the main body 64 has multiple retention spaces Ss (shown as Ss1, Ss2, Ss3, Ss4, and Ss5 in Figure 5) that retain a portion of the air that flows into the main body 64 from the cyclone separator 30. Details of the retention spaces Ss will be described later.

[0057] As shown in Figure 5, the main body 64 has a plurality of protrusions 65 projecting from its inner wall surface 64a. Each protrusion 65 is formed by partially recessing the side wall of the main body 64 inward. Each protrusion 65 extends along the circumferential direction of the main body 64. That is, each protrusion 65 extends in a direction intersecting the flow direction. Each protrusion 65 is an annular shape extending around the entire circumference of the main body 64. The protrusions 65 do not extend around the entire circumference of the main body 64, but may be divided into multiple parts in the circumferential direction of the main body 64. The plurality of protrusions 65 are aligned in the flow direction. In this embodiment, five protrusions 65 are aligned in the flow direction.

[0058] Each projection 65 is located outside the flow path space Sf in a direction perpendicular to the flow direction. In this embodiment, the vertices of the multiple projections 65 aligned in the flow direction are aligned on a straight line (shown as a dashed line in Figure 6) that passes through the edge of the inlet 66a and extends along the flow direction. That is, when viewed from above, the vertices of the multiple projections 65 coincide with the edge of the inlet 66a. The vertices of the projections 65 may be separated from the edge of the inlet 66a when viewed from above.

[0059] The space defined by two adjacent protrusions 65 in the flow direction and the inner wall surface 64a between the two protrusions 65 functions as a retention space Ss. Furthermore, the space defined by the most upstream (downward) protrusion 65 in the flow direction, the flange portion 63, and the inner wall surface 64a between the protrusion 65 and the flange portion 63 also functions as a retention space Ss. That is, the flange portion 63 functions as a "protrusion" in this invention. In this embodiment, five retention spaces Ss are formed in a line in the flow direction. Each retention space Ss is formed outside the flow channel space Sf in a direction perpendicular to the flow direction. In the following description, when distinguishing the five retention spaces Ss, they will be referred to as retention space Ss1, retention space Ss2, retention space Ss3, retention space Ss4, and retention space Ss5, in order from the one located upstream in the flow direction. In Figure 5, the retention spaces Ss are shown with dot hatching.

[0060] Multiple retention spaces Ss include at least two retention spaces Ss with different volumes. These at least two retention spaces Ss with different volumes correspond to the "first retention space" and the "second retention space" of the present invention. In this embodiment, the multiple retention spaces Ss are arranged in the flow direction such that in any pair of adjacent retention spaces Ss in the flow direction, the volume of the retention space Ss located upstream in the flow direction is greater than or equal to the volume of the retention space Ss located downstream in the flow direction. For example, in the pair of adjacent retention spaces Ss2 and Ss3 in the flow direction, the volume of retention space Ss2 located upstream in the flow direction is greater than or equal to the volume of retention space Ss3 located downstream in the flow direction. That is, the multiple retention spaces Ss are arranged such that retention spaces Ss with larger volumes are located further upstream in the flow direction.

[0061] Here, let d1 be the distance between the flange portion 63 defining the retention space Ss1 and the projection 65, d2 be the distance between the two projections 65 defining the retention space Ss2, d3 be the distance between the two projections 65 defining the retention space Ss3, d4 be the distance between the two projections 65 defining the retention space Ss4, and d5 be the distance between the two projections 65 defining the retention space Ss5. In this case, d1≧d2≧d3≧d4≧d5. Note that at least two of d1, d2, d3, d4, and d5 are different from each other. Also, the inner diameter of the main body portion 64 is constant except in the portion where the projections 65 are formed. In other words, the cross-sectional area of ​​the main body portion 64 in a section perpendicular to the flow direction of its internal space is constant except in the portion where the projections 65 are formed. In other words, in this embodiment, the distance between the two protrusions 65 that define each retention space Ss (the distance between the flange portion 63 and the protrusion 65 in the case of retention space Ss1) is adjusted so that at least two of the multiple retention spaces Ss have different volumes.

[0062] The lower surface 65a of the projection 65, which is the upstream surface in the flow direction, extends downstream from the inner wall surface 64a in the flow direction. That is, the lower surface 65a is located downstream in the flow direction from the base end of the projection 65, which is the end end connected to the inner wall surface 64a. The upper surface 65b of the projection 65, which is the downstream surface in the flow direction, extends in a direction perpendicular to the flow direction (vertical direction). That is, the upper surface 65b is perpendicular to the inner wall surface 64a.

[0063] Here, as shown in Figure 5, the length da is the length along the flow direction between the upstream end and the downstream end of the lower surface 65a of the projection 65 in the flow direction. The lengths da of all the projections 65 are equal. Also, the angle θ is the angle that the lower surface 65a of the projection 65 makes with the inner wall surface 64a. The angles θ of the lower surface 65a of all the projections 65 are equal.

[0064] The exhaust noise suppressor 60 is made of, for example, resin. The exhaust noise suppressor 60 is formed by injection molding. The main body 64 is formed by injection molding by dividing it into multiple parts in the circumferential direction. For example, the main body 64 is formed by injection molding two substantially semi-cylindrical parts 64p as shown in Figures 6(a) and 6(b), and then joining them together. The mold release direction during injection molding of part 64p is perpendicular to a virtual plane P parallel to the bonding surface with the paired part 64p. That is, the mold release direction is perpendicular to the direction of flow in the main body 64 of the finished exhaust noise suppressor 60. In Figures 6(a) and 6(b), the mold release direction is indicated by an arrow.

[0065] The shape of the projection 65 allows for the die-cutting of part 64p. That is, as shown in Figure 5, when viewed from a direction perpendicular to the inner wall surface 64a within the main body 64 (indicated by the arrow in Figure 5), the projection 65 is shaped so that it does not overlap with the inner wall surfaces 64a on either side of the flow direction of the projection 65. For example, the projection 165 shown by the dashed line in Figure 5 overlaps with the inner wall surface 64a on the upstream side of the flow direction of the projection 165 when viewed from a direction perpendicular to the inner wall surface 64a within the main body 64. With the shape of the projection 165, part 64p cannot be die-cut in the direction of the arrows in Figures 6(a) and 6(b).

[0066] Here, with reference to Figure 7, the principle by which the exhaust noise is suppressed in the exhaust noise suppressor 60 will be explained. Most of the air that flows from the cyclone separator 30 into the main body 64 of the exhaust noise suppressor 60 flows in the flow path space Sf along the direction of flow, as shown by the thick arrows in Figure 7. In addition, a portion of the air that flows into the main body 64 flows into the stagnant space Ss, as shown by the thin arrows in Figure 7.

[0067] Air flowing into the main body 64 tends to flow into the larger retention spaces Ss. In this embodiment, the multiple retention spaces Ss are arranged such that the larger retention spaces Ss are located further upstream in the flow direction. Therefore, some of the air flowing into the main body 64 first flows into the nearest retention space Ss, and then sequentially flows into the further retention spaces Ss.

[0068] Furthermore, the air that strikes the lower surface 65a of the projection 65, which is heading towards the stagnant space Ss, is guided downstream in the flow direction along the lower surface 65a and flows into the stagnant space Ss located above the projection 65.

[0069] The stagnant space Ss allows a portion of the air that flows from the air discharge section 50 of the cyclone separator 30 into the main body 64 of the noise suppressor 60 to be retained within the main body 64. By creating turbulence in the airflow in this way, the flow velocity of the air flowing along the flow direction in the flow path space Sf can be reduced. In other words, the energy of the air flowing within the main body 64 can be attenuated. In this manner, the noise generated by discharging air from the cyclone separator 30 through the outlet 66b of the main body 64 is suppressed.

[0070] (Comparative study 1) The inventors conducted comparative tests using a noise emission suppressor that has multiple retention spaces Ss formed, including at least two retention spaces Ss with different volumes, as in this embodiment (Example 1), and a noise emission suppressor in which the volumes of all retention spaces Ss are equal (Comparative Examples 1-8). In each noise emission suppressor in Example 1 and Comparative Examples 1-8, the inner diameter of the main body part in which the retention spaces Ss are formed is constant. That is, in Example 1, the volumes of at least two retention spaces Ss are different by adjusting the distance between the two protrusions that define each retention space Ss. Also, the inner diameter of the main body part of the noise emission suppressors in Example 1 and Comparative Examples 1-8 is the same.

[0071] The conditions for the comparative tests described above are shown in the table in Figure 8. Here, the distance between the two protrusions defining each retention space Ss is denoted as d1, d2, ..., dn (see Figure 5), in order from the upstream side in the flow direction among the multiple retention spaces Ss. Note that "n" is the number of retention spaces Ss formed in the sound emission suppressor. Specifically, in Example 1, five retention spaces Ss are formed, with d1 being 30 mm, d2 26 mm, d3 26 mm, d4 18 mm, and d5 18 mm. In Comparative Example 1, four retention spaces Ss are formed, with d1 to d4 all being 30 mm. In Comparative Example 2, five retention spaces Ss are formed, with d1 to d5 all being 26 mm. In Comparative Example 3, four retention spaces Ss are formed, with d1 to d4 all being 26 mm. In Comparative Example 4, six retention spaces Ss are formed, and d1 to d6 are all 22 mm. In Comparative Example 5, five retention spaces Ss are formed, and d1 to d5 are all 22 mm. In Comparative Example 6, seven retention spaces Ss are formed, and d1 to d7 are all 18 mm. In Comparative Example 7, six retention spaces Ss are formed, and d1 to d6 are all 18 mm. In Comparative Example 8, eight retention spaces Ss are formed, and d1 to d8 are all 14 mm. The total length L of the main body part in which the retention spaces Ss are formed (see Figure 5) is 141 mm for Example 1, 139 mm for Comparative Example 1, 153 mm for Comparative Example 2, 123 mm for Comparative Example 3, 159 mm for Comparative Example 4, 133 mm for Comparative Example 5, 157 mm for Comparative Example 6, 135 mm for Comparative Example 7, and 147 mm for Comparative Example 8.

[0072] Figure 9 shows the results of noise measurements when operating a fiber waste collection device using each of the noise emission suppressors according to Example 1 and Comparative Examples 1 to 8. As shown in Figure 9, the noise measurement results were 73 dB for Example 1, 73.5 dB for Comparative Example 1, 73.5 dB for Comparative Example 2, 73.3 dB for Comparative Example 3, 73.4 dB for Comparative Example 4, 73.6 dB for Comparative Example 5, 73.4 dB for Comparative Example 6, 73.6 dB for Comparative Example 7, and 73.4 dB for Comparative Example 8. In other words, the noise measurement results for Example 1, in which multiple retention spaces Ss with different volumes are included, are 0.3 dB to 1.6 dB lower than the noise measurement results for Comparative Examples 1 to 8, in which the volumes of all multiple retention spaces Ss are equal.

[0073] (Comparative study 2) Next, comparative tests were conducted using emission sound suppressors (Examples 1-6) that had three types of retention spaces Ss with different volumes: large, medium, and small. In Examples 1-6, the order of the three types of retention spaces Ss differs from one another. In each example, a total of five retention spaces Ss are formed: one large retention space Ss, two medium retention spaces Ss, and two small retention spaces Ss. In each emission sound suppressor from Examples 1-6, the inner diameter of the main body where the retention spaces Ss are formed is constant. That is, the volumes of the three types of retention spaces Ss are made different by adjusting the distance between the two protrusions that define each retention space Ss. Also, the inner diameter of the main body of the emission sound suppressors from Examples 1-6 is the same.

[0074] The conditions for the comparative tests described above are shown in the table in Figure 10. Example 1 is as described above. In Example 2, d1 and d2 are 26 mm, d3 is 30 mm, and d4 and d4 are 18 mm. In Example 3, d1 is 30 mm, d2 and d3 are 18 mm, and d4 and d5 are 26 mm. In Example 4, d1 and d2 are 26 mm, d3 and d4 are 18 mm, and d5 is 30 mm. In Example 5, d1 and d2 are 18 mm, d3 is 30 mm, and d4 and d5 are 26 mm. In Example 6, d1 and d2 are 18 mm, d3 and d4 are 26 mm, and d5 is 50 mm. The total length L of the main body where the retention space Ss is formed (see Figure 5) is 141 mm in all cases.

[0075] Figure 12 shows the results of noise measurements taken when operating a fiber waste collection device using each of the noise emission suppressors according to Examples 1 to 6. As shown in Figure 12, the noise measurement results were 73 dB for Example 1, 73.1 dB for Example 2, 73.3 dB for Example 3, 73.4 dB for Example 4, 73.4 dB for Example 5, and 73.4 dB for Example 6. In other words, the noise measurement result for Example 1, in which the multiple retention spaces Ss are arranged so that the retention spaces Ss with larger volumes are located upstream in the flow direction, was the lowest.

[0076] (Characteristics of the embodiment) As described above, the fiber waste collection device 1 of this embodiment includes a pipe 11 through which fiber waste flows with air, a fiber waste collection container 13 for collecting the fiber waste sent by the pipe 11, and a cyclone separator 30 provided between the pipe 11 and the fiber waste collection container 13 for separating the fiber waste from the air sent by the pipe 11 and discharging the separated fiber waste into the fiber waste collection container 13. The cyclone separator 30 is provided with an air discharge section 50 having an opening 50a through which the air from which the fiber waste has been separated flows out. Furthermore, the system is equipped with an exhaust noise suppressor 60 that suppresses the sound of air being discharged from the air discharge section 50. The exhaust noise suppressor 60 has a main body 64 which is a substantially cylindrical member in which a flow channel space Sf is formed that extends in the flow direction from one end (lower end) to the other end (upper end) connected to the air discharge section 50. The main body 64 has a plurality of retention spaces Ss formed outside the flow channel space Sf in a direction perpendicular to the flow direction, and the plurality of retention spaces Ss are arranged in the flow direction and include at least two retention spaces Ss with different volumes from each other.

[0077] According to the above configuration, the exhaust noise suppressor 60 can reduce the flow velocity of the air flowing through the flow path space Sf of the main body 64 by retaining a portion of the air from the air discharge section 50 of the cyclone separator 30 within the main body 64 using the retention space Ss. This attenuates the energy of the air and suppresses the exhaust noise of the air from the cyclone separator 30. In addition, the retention spaces Ss, which have different volumes, can suppress sounds of different frequencies. Therefore, the exhaust noise of the air can be effectively suppressed. Furthermore, since the retention space Ss is located outside the flow path space Sf, the air flow path from the air discharge section 50 of the cyclone separator 30 can be ensured. Therefore, the separation performance of the cyclone separator 30 can be maintained without obstructing the discharge of air from the air discharge section 50 of the cyclone separator 30.

[0078] Furthermore, in the fiber waste collection device 1 of this embodiment, the main body 64 has a plurality of projections 65 and flanges 63 that protrude from its inner wall surface 64a and extend in a direction intersecting the flow direction, and are aligned in the flow direction. Each retention space Ss is defined by two adjacent projections 65 (or projections 65 and flanges 63) in the flow direction and the inner wall surface 64a between the two projections 65 (or between the projections 65 and flanges 63). Therefore, a retention space Ss for retaining air can be realized with a relatively simple configuration.

[0079] Furthermore, in the fiber waste collection device 1 of this embodiment, the projection 65 has a lower surface 65a, which is the upstream surface in the flow direction, extending downstream from the inner wall surface 64a in the flow direction. With this configuration, the air from the cyclone separator 30 is guided by the lower surface 65a of the projection 65 and flows more easily into the stagnant space Ss. Therefore, more air can be taken into the stagnant space Ss, and thus the noise of air discharge can be suppressed more effectively.

[0080] In addition, in the fiber waste collection device 1 of this embodiment, at least two of the multiple retention spaces Ss have different spacings between the two protrusions 65 (or the protrusions 65 and the flange portion 63) that define them. By making the spacing between the two protrusions 65 (or the protrusions 65 and the flange portion 63) that define the retention spaces Ss different in this way, the volumes of at least two retention spaces Ss can be made different with a relatively simple configuration.

[0081] Furthermore, in the fiber waste collection device 1 of this embodiment, the projection 65 is shaped such that it does not overlap with the inner wall surface 64a when viewed from a direction perpendicular to the inner wall surface 64a within the main body 64. With this configuration, the shape of the projection 65 can be formed with a relatively simple mold when the main body 64 is formed by mold processing.

[0082] Furthermore, in the fiber waste collection device 1 of this embodiment, the multiple retention spaces Ss are arranged in the flow direction such that in any pair of adjacent retention spaces Ss in the flow direction, the volume of the retention space Ss located upstream in the flow direction is greater than or equal to the volume of the retention space Ss located downstream in the flow direction. When the main body 64 is provided with multiple retention spaces Ss of different volumes, air from the cyclone separator 30 tends to flow into the retention space Ss with a larger volume. Therefore, if the retention space Ss with a smaller volume is located upstream (towards the front) in the flow direction, and the retention space Ss with a larger volume is located downstream (towards the back) in the flow direction, the air from the cyclone separator 30 does not flow much into the smaller retention space Ss on the front side, but rather flows into the larger retention space Ss at the back. Thus, the retention space Ss with a smaller volume cannot be effectively utilized. In this configuration, the larger the volume of the stagnant space Ss, the further upstream it is in the flow direction. Therefore, the air from the cyclone separator 30 first flows into the stagnant space Ss located closest to the front, and then sequentially flows into the stagnant spaces Ss further back. As a result, all of the stagnant spaces Ss can be effectively utilized, further reducing the noise from air discharge.

[0083] Although embodiments of the present invention have been described above with reference to the drawings, it should be understood that the specific configurations are not limited to these embodiments. The scope of the present invention is indicated by the claims rather than the above description of embodiments, and all modifications within the meaning and scope equivalent to the claims are included.

[0084] In the embodiments described above, the main body 64 is described as being cylindrical in shape and extending in one direction (up and down), but it is not limited to this. The main body 64 may be cylindrical with a polygonal cross-sectional shape. When the main body 64 is cylindrical, the noise emission suppressor 60 may be arranged such that the direction in which the main body 64 extends is a direction other than up and down. The main body 64 may be a hollow, elongated tubular member. That is, the main body 64 may be curved in part or entirely. For example, the main body 64 may be flexible and configured to be curved and arranged to match the arrangement of the device or equipment.

[0085] Furthermore, although the above-described embodiment described a case in which a flow channel space Sf extending vertically is formed within the main body 64, the invention is not limited to this case. If the main body 64 is curved, the flow channel space Sf will also be curved accordingly.

[0086] Furthermore, although the above-described embodiment described a case in which the projection 65 extends along the circumferential direction of the main body 64, the invention is not limited to this. The projection 65 may extend diagonally with respect to the circumferential direction.

[0087] In addition, although the above-described embodiment described a case in which the projection 65 is formed by partially recessing the side wall of the main body 64 inward, it is not limited to this. For example, the projection 65 may be formed by partially increasing the thickness of the side wall of the main body 64.

[0088] Furthermore, although the above-described embodiment described a case in which the lower surface 65a of the projection 65 extends downstream from the inner wall surface 64a in the flow direction, it is not limited to this. The lower surface 65a may extend downstream from the inner wall surface 64a in the flow direction, or it may extend in a direction perpendicular to the inner wall surface 64a.

[0089] Furthermore, although the above-described embodiment described a case in which the upper surface 65b of the projection 65 extends in a direction perpendicular to the inner wall surface 64a, the embodiment is not limited to this. The upper surface 65b may extend downstream from the inner wall surface 64a in the flow direction, or it may extend upstream from the inner wall surface 64a in the flow direction.

[0090] In addition, the above-described embodiment explains a case in which the volumes of at least two retention spaces Ss are made different by making the spacing between the two protrusions 65 (or the protrusions 65 and the flange portion 63) that define the retention spaces Ss different, but the invention is not limited to this. That is, in the modified noise suppressor 260 shown in Figure 12, the spacings d11, d12, d13, d14, and d15 between the two protrusions 265 (or the protrusions 265 and the flange portion 263) that define each retention space Ss11, Ss12, Ss13, Ss14, and Ss15 are all equal.

[0091] The inner diameter of the main body 264 of the noise emission suppressor 260 is not constant. Here, of the inner diameter of the main body 264, let D1 be the inner diameter of the part where the retention space Ss11 is provided, D2 be the inner diameter of the part where the retention space Ss12 is provided, D3 be the inner diameter of the part where the retention space Ss13 is provided, D4 be the inner diameter of the part where the retention space Ss14 is provided, and D5 be the inner diameter of the part where the retention space Ss15 is provided. In this case, D1 ≥ D2 ≥ D3 ≥ D4 ≥ D5. Note that at least two of D1, D2, D3, D4, and D5 are different from each other. That is, in at least two of the parts of the main body 264 where the multiple retention spaces Ss are provided, the cross-sectional areas in the section perpendicular to the flow direction of the internal space of the main body 264 are different from each other.

[0092] In this modified example, the main body portion 264 has a constant outer diameter. That is, in at least two parts of the main body portion 264 where the inner diameters differ, the thickness of the side walls of the main body portion 264 differs. In other words, the side walls of the main body portion 264 are thicker in the parts with smaller inner diameters than in the parts with larger inner diameters. The thickness of the side walls of the main body portion 264 may be constant. In this case, the outer diameters of the main body portion 264 differ in at least two parts of the main body portion 264 where the inner diameters differ.

[0093] Thus, in the modified noise suppressor 260, the volume of at least two of the multiple retention spaces Ss is made different by adjusting the cross-sectional area of ​​the section perpendicular to the flow direction of the internal space of the main body 264. Alternatively, the volume of at least two of the multiple retention spaces Ss may be made different by adjusting both the distance between the two protrusions 265 (or the protrusions 265 and the flange portion 263) that define the retention spaces Ss and the cross-sectional area of ​​the section perpendicular to the flow direction of the internal space of the main body 264.

[0094] Furthermore, in the above-described embodiment, the projection 65 was described as having a shape that does not overlap with the inner wall surface 64a when viewed from a direction perpendicular to the inner wall surface 64a within the main body 64, but the invention is not limited to this. That is, the projection 65 may have a shape that overlaps with the inner wall surface 64a when viewed from a direction perpendicular to the inner wall surface 64a within the main body 64.

[0095] In addition, although the above-described embodiment described the noise emission suppressor 60 as being made of resin and formed by injection molding, the material and manufacturing method of the noise emission suppressor 60 are not limited thereto. For example, the noise emission suppressor 60 may be made of metal. The noise emission suppressor 60 may also be composed of multiple parts made of different materials.

[0096] Furthermore, although the above embodiment described a case where the larger volume retention space Ss is located further upstream in the flow direction, the device is not limited to this. The noise emission suppressor 60 can be formed by having two retention spaces Ss that are aligned in the flow direction and have different volumes. Preferably, the retention space Ss with the larger volume is located further upstream in the flow direction than the retention space Ss with the smaller volume. However, the arrangement of these two retention spaces Ss is not particularly limited.

[0097] In addition, although the above embodiment describes a case in which a shielding cover 62 is attached to the lower end of the mounting portion 61 of the exhaust noise suppressor 60, the invention is not limited to this. The shielding cover 62 may be provided in the flow path from the air discharge portion 50 of the cyclone separator 30 to the outside. That is, for example, the shielding cover 62 may be attached to the upper end of the mounting portion 61. The shielding cover 62 may also be attached to the air discharge portion 50 of the cyclone separator 30. [Explanation of Symbols]

[0098] 1. Fiber waste collection device 11 Piping 13. Textile waste collection container (textile waste collection section) 30 Cyclone Separator 50 Air discharge section 50a opening 60, 260 Emission sound suppressor 64, 264 Main body (tubular part) 64a Inner wall surface 65, 265 protrusion 101 False twisting machine Sf flow channel space Ss retention space

Claims

1. A pipe through which fiber waste flows with the air, A fiber waste collection unit for collecting the fiber waste sent through the aforementioned piping, A fiber waste collection apparatus comprising: a cyclone separator provided between the piping and the fiber waste collection section, which separates the fiber waste from the air supplied by the piping and discharges the separated fiber waste to the fiber waste collection section, The cyclone separator is provided with an air discharge section having an opening through which the air from which the fiber debris has been separated flows out. It is equipped with an exhaust noise suppressor that suppresses the sound of the air being discharged from the air discharge section, The aforementioned noise emission suppressor has a tubular portion which is a tubular member having a flow path space formed therein that extends in the flow direction from one end connected to the air discharge section toward the other end, In the tubular portion, a plurality of retention spaces are formed outside the flow path space in a direction perpendicular to the flow direction. The fiber waste collection apparatus comprises a plurality of retention spaces, which are arranged in the flow direction and include a first retention space and a second retention space, each having a different volume from the others.

2. The tubular portion has a plurality of projections that protrude from its inner wall surface and extend in a direction intersecting the flow direction, and are aligned in the flow direction. The fiber waste collection device according to claim 1, wherein each of the aforementioned retention spaces is defined by two adjacent protrusions in the flow direction and the inner wall surface between the two protrusions.

3. The fiber waste collection device according to claim 2, wherein the surface of the projection on the upstream side in the flow direction extends from the inner wall surface toward the downstream side in the flow direction.

4. The fiber waste collection device according to claim 2 or 3, wherein the distance between the two protrusions defining the first retention space is different from the distance between the two protrusions defining the second retention space.

5. The fiber waste collection device according to any one of claims 2 to 4, wherein the cross-sectional area of ​​the tubular portion in a section perpendicular to the flow direction of its internal space differs between the portion where the first retention space is provided and the portion where the second retention space is provided.

6. The fiber waste collection device according to any one of claims 2 to 5, wherein the projection has a shape that does not overlap with the inner wall surface when viewed from a direction perpendicular to the inner wall surface within the tubular portion.

7. The fiber waste collection apparatus according to any one of claims 1 to 6, wherein the first retention space has a volume greater than the volume of the second retention space and is located upstream of the second retention space in the flow direction.

8. The fiber waste collection apparatus according to claim 7, wherein the plurality of retention spaces are arranged in the flow direction such that in any pair of adjacent retention spaces in the flow direction, the volume of the retention space located upstream in the flow direction is greater than or equal to the volume of the retention space located downstream in the flow direction.

9. A false twisting machine equipped with a fiber waste recovery device according to any one of claims 1 to 8.

Images