Low-fiber-falling air-jet vortex spinning yarn guiding cone and nozzle device

Abstract

The invention relates to a low-fiber-falling air-jet vortex spinning yarn guiding cone and a nozzle device. The yarn guiding cone comprises a first circular truncated cone section, a second circular truncated cone section, a first cylindrical section and a second cylindrical section which are sequentially connected from upstream to downstream and are coaxially arranged; a first cylindrical hole, a second cylindrical hole, a first circular-truncated-cone-shaped hole, a second circular-truncated-cone-shaped hole and a third cylindrical hole which are communicated and coaxially arranged are sequentially formed in the yarn guiding cone from upstream to downstream, and one or more annular grooves are formed in the wall face, close to an inlet, of the first cylindrical hole. According to the yarn guiding cone, one or more annular grooves are formed in the wall face, close to the inlet, of the first cylindrical hole, so that the fiber falling amount in the spinning process is reduced under the condition that the air consumption of equipment is not increased, and particularly, fiber raw materials can be more sufficiently and efficiently utilized when fibers with poor length uniformity are spun; and fiber loss and raw material waste are reduced.

Description

Technical Field

[0001] This invention belongs to the technical field of spinning equipment, and in particular relates to a low-fiber-falling air jet vortex spinning cone and nozzle device. Background Technology

[0002] Jet vortex spinning technology utilizes a high-speed rotating airflow generated inside a nozzle to twist fibers into yarn. The yarn guide cone is one of the key components in the nozzle. During the jet vortex spinning process, the head end of the fiber fed into the nozzle is drawn into the yarn guide cone to become the yarn core. The tail end of the fiber is bent over by the high-speed rotating airflow inside the nozzle and rotates around the yarn core, ultimately forming a jet vortex yarn with an entangling structure.

[0003] During fiber rotation, some fibers are pulled out by the airflow under the action of the tangential and axial components of the rotating airflow in the vortex chamber, overcoming the holding force of the yarn core. This results in fiber loss and waste of raw materials, and also affects the evenness and strength of the yarn. In particular, when the fiber bundle fed into the nozzle has low length uniformity and contains some short fibers (such as cotton fibers), the short fibers have a small contact length with other fibers, resulting in a smaller holding force from the yarn, making them more prone to becoming fiber waste.

[0004] The structure of the yarn-drawing cone directly affects the movement pattern of fibers during the yarn-forming process. To reduce fiber loss during spinning, some research institutions and equipment manufacturers have improved the design of the yarn guide cone. For example, Chinese invention patent CN102828289B discloses a jet vortex spinning guide cone with suction holes on the yarn guide channel wall. This provides negative pressure adsorption force on the yarn guide channel wall, increasing the friction force experienced by the yarn as it passes through the yarn guide channel during the forming process and making the yarn structure more compact. This increases the holding force of the sliver on the fiber end, thereby reducing fiber loss during yarn formation. Another example is Chinese invention patent CN101294319B, which discloses a jet vortex spinning guide cone with a compacting effect. It has a false twist airflow nozzle at its downstream end. The rotating airflow sprayed in the false twist airflow nozzle produces a false twist effect on the yarn, thereby compacting the yarn structure and enhancing the binding of the yarn tail to the fiber. This reduces the probability that the fiber entering the yarn tail will be pulled out by the high-speed rotating airflow, thus reducing the fiber loss rate during spinning. The above methods all utilize airflow to concentrate the fiber ends in the yarn, thereby enhancing the holding force on the fibers and reducing fiber fallout. However, using airflow to achieve the above purpose will increase the air consumption of the equipment, resulting in a significant increase in the equipment's energy consumption, which is not conducive to energy saving, consumption reduction and efficient production in air jet vortex spinning enterprises.

[0005] Therefore, this technical field needs to solve how to provide a low-fiber-loss jet vortex spinning cone and nozzle device, which can reduce the amount of fiber loss during the spinning process compared with the prior art without increasing the air consumption of the equipment. In particular, when spinning fibers with poor length uniformity (such as cotton fibers), it can make fuller and more efficient use of fiber raw materials, and reduce fiber loss and waste of raw materials. Summary of the Invention

[0006] The technical problem to be solved by this invention is to provide a low-fiber-shedding air-jet vortex spinning cone and nozzle device, which reduces fiber shedding during the spinning process without increasing the air consumption of the equipment. This is particularly beneficial when spinning fibers with poor length uniformity (such as cotton fibers), enabling more efficient and full utilization of fiber raw materials and reducing fiber loss and waste. To achieve the above objective, this invention is implemented through the following technical solution:

[0007] A low-drop-fiber jet vortex spinning yarn-guiding cone, the yarn-guiding cone comprising a first frustum section, a second frustum section, a first cylindrical section and a second cylindrical section arranged coaxially from upstream to downstream, the yarn-guiding cone having a first cylindrical hole, a second cylindrical hole, a first frustum hole, a second frustum hole and a third cylindrical hole arranged coaxially from upstream to downstream, the first cylindrical hole having one or more annular grooves on the wall near the inlet.

[0008] Preferably, when multiple annular grooves are provided, the annular grooves are arranged sequentially along the axial direction of the first cylindrical hole.

[0009] Preferably, the number of annular grooves is 1 to 4.

[0010] Preferably, the diameter of the first cylindrical hole is 1.0 mm to 1.5 mm.

[0011] Preferably, the bottom surface of the annular groove is parallel to the wall surface, and the first side of the annular groove located upstream and the second side located downstream are both perpendicular to the wall surface.

[0012] Preferably, the axial distance between the first side of the annular groove located upstream and the second side located downstream is 0.05mm to 0.3mm.

[0013] Preferably, the radial distance between the bottom surface of the annular groove and the wall surface of the first cylindrical hole is 0.04 mm to 0.1 mm.

[0014] Preferably, the distance between the first side of the annular groove closest to the inlet of the first cylindrical hole and the upper end point of the yarn-drawing cone is 0.05mm to 0.2mm, and the distance between the second side of the annular groove furthest from the inlet of the first cylindrical hole and the upper end point of the yarn-drawing cone is no more than 0.5mm.

[0015] Preferably, the distance between the two nearest sides of the adjacent annular groove is 0.05mm to 0.2mm.

[0016] A jet vortex spinning nozzle device includes the above-mentioned yarn guide cone;

[0017] The nozzle device is provided with a fiber guiding assembly, a vortex tube, a yarn guiding cone, and a yarn guiding tube in sequence from upstream to downstream. The fiber guiding assembly, the vortex tube, the yarn guiding cone, and the yarn guiding tube are installed inside the nozzle housing.

[0018] The fiber guide assembly consists of a guide body, a guide body housing, and a guide needle, with a fiber guide channel formed between the guide body and the guide body housing;

[0019] The vortex tube has a cylindrical space for fiber bundle introduction and airflow injection holes evenly distributed circumferentially on the wall of the vortex tube.

[0020] The head end of the yarn-drawing cone is located in a cylindrical space inside the vortex tube, and a yarn-drawing tube is provided downstream of the yarn-drawing cone.

[0021] This invention provides a low-fiber-falling jet vortex spinning cone and nozzle device, which has the following beneficial effects:

[0022] The yarn-drawing cone of the present invention provides one or more annular grooves on the wall surface of the first cylindrical hole near the inlet. This causes flow separation when the airflow in the first cylindrical hole flows through the annular grooves, forming a vortex within the grooves. The pressure in the grooves is lower than the airflow pressure in the first cylindrical hole. This pressure difference causes the fibers in the yarn within the first cylindrical hole to adhere more tightly to the wall surface of the first cylindrical hole while rotating and being transported into the yarn-drawing cone. This increases the frictional force exerted on the fiber ends by the wall surface of the first cylindrical hole, making it less likely for the fibers to be pulled out of the yarn and become waste fibers under the action of the rotating airflow in the vortex chamber. This reduces the amount of waste fibers during the spinning process without increasing the air consumption of the equipment. In particular, when spinning fibers with poor length uniformity (such as cotton fibers), it can make fuller and more efficient use of fiber raw materials, reducing fiber loss and waste of raw materials. Attached Figure Description

[0023] Figure 1 This is a longitudinal sectional view of the jet vortex spinning nozzle device of the present invention;

[0024] Figure 2This is a perspective sectional view of the jet vortex spinning nozzle device of the present invention;

[0025] Figure 3 This is a perspective view of the yarn-drawing cone of Embodiment 1 of the present invention;

[0026] Figure 4 This is a longitudinal sectional view of the yarn-drawing cone of Embodiment 1 of the present invention;

[0027] Figure 5 For the present invention Figure 4 Enlarged view of point A in the middle;

[0028] Figure 6 This is a cloud map showing the airflow streamlines and pressure distribution in the area near the annular groove of the yarn-drawing cone in the working state according to Embodiment 1 of the present invention;

[0029] Figure 7 This is a schematic diagram of the airflow streamlines and fiber forces and states in the area near the annular groove of the yarn-drawing cone in the working state of Embodiment 1 of the present invention.

[0030] Figure 8 This is a perspective view of the yarn-drawing cone of Embodiment 2 of the present invention;

[0031] Figure 9 This is a longitudinal sectional view of the yarn-drawing cone of Embodiment 2 of the present invention;

[0032] Figure 10 For the present invention Figure 9 Enlarged view of point B in the middle. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0034] Figures 1 to 2 A schematic diagram of the structure of an air-jet vortex spinning nozzle device 17 in which the yarn-feeding cone 1 of the present invention can be used is shown. The structure and operation of the nozzle device 17 are explained to better illustrate the role of the yarn-feeding cone of the present invention in the nozzle device. The present invention can be used in, but is not limited to, this type of nozzle device. The present invention can also be used in other nozzle devices with the same purpose but different structures.

[0035] The nozzle device 17 is provided with a fiber guiding assembly 19, a vortex tube 20, a yarn guiding cone 1, and a yarn guiding tube 23 in sequence from upstream to downstream. The fiber guiding assembly 19, the vortex tube 20, the yarn guiding cone 1, and the yarn guiding tube 23 are installed inside the nozzle housing 28.

[0036] The fiber guiding assembly 19 consists of a guide body 19a, a guide body housing 19b, and a guide needle 19c. A fiber guiding channel 30 is formed between the guide body 19a and the guide body housing 19b, which is used to guide the fiber bundle 18 delivered by the stretching device (not shown in the figure) into the nozzle device 17.

[0037] The vortex tube 20 has a cylindrical space 27 for guiding the fiber bundle 18 and airflow injection holes 29 evenly distributed circumferentially on the wall of the vortex tube 20. Compressed air is injected into the cylindrical space 27 inside the vortex tube 20 through the airflow injection holes 29, thereby forming a high-speed rotating airflow 21 in the space. The high-speed rotating airflow 21 causes the fiber bundle 18 to rotate while being transported downstream.

[0038] The head end of the yarn-drawing cone 1 is located in the cylindrical space 27 inside the vortex tube 20. It is used to support the tail end free fiber 31 in the fiber bundle 18 when it is bent over the outer wall of the head end of the yarn-drawing cone 1 and rotates with the airflow under the action of the high-speed rotating airflow 21. A yarn-drawing tube 23 is provided downstream of the yarn-drawing cone 1 for drawing the formed yarn 22 out from the nozzle device 17.

[0039] This invention provides a low-drop-fiber jet vortex spinning yarn-guiding cone 1, the yarn-guiding cone 1 comprising a first frustum section 2, a second frustum section 3, a first cylindrical section 4, and a second cylindrical section 5 arranged coaxially from upstream to downstream, and the yarn-guiding cone 1 having a first cylindrical hole 7, a second cylindrical hole 8, a first frustum hole 9, a second frustum hole 10, and a third cylindrical hole 11 arranged coaxially from upstream to downstream, characterized in that the first cylindrical hole 7 has one or more annular grooves 13 on the wall surface 12 near the inlet 6.

[0040] The design of the first frustum segment 2, the second frustum segment 3, the first cylindrical segment 4, the second cylindrical segment 5, the first cylindrical hole 7, the second cylindrical hole 8, the first frustum hole 9, the second frustum hole 10, and the third cylindrical hole 11, regarding diameter, cone angle, etc., is based on patent CN119800559A and will not be repeated here. This invention focuses on explaining the design of the annular groove 13.

[0041] Figure 6 This is a computer simulation of the airflow streamlines and pressure distribution cloud map near the annular groove 13 of the yarn-drawing cone 1 of the present invention in its working state. The curves with arrows represent airflow, and the direction of the arrows indicates the airflow direction. As can be seen from the figure, the airflow in the first cylindrical hole 7 inside the yarn-drawing cone 1 undergoes flow separation when flowing through the annular groove 13, forming a vortex 26 within the annular groove 13, and causing the pressure within the annular groove 13 to be lower than the airflow pressure in the first cylindrical hole 7.

[0042] Figure 7 This is a schematic diagram showing the airflow streamlines and the forces and states of the tail-end free fiber 31 in the region near the annular groove 13 of the yarn-drawing cone 1 in the working state. The pressure difference between the airflow in the first cylindrical hole 7 and the airflow in the annular groove 13 generates a force F that presses the tail-end free fiber 31 into the annular groove 13. This causes the tail-end free fiber 31 in the yarn 22 in the first cylindrical hole 7 to adhere more tightly to the wall surface 12 of the first cylindrical hole 7 while rotating and being transported into the yarn-drawing cone 1. This increases the frictional force exerted on the fiber 31 by the wall surface 12 of the first cylindrical hole 7, making it less likely for the tail-end free fiber 31 to be pulled out of the yarn 22 and become a loose fiber under the action of the rotating airflow in the cylindrical space 27.

[0043] It is worth mentioning that, in order to reduce fiber shedding, patent CN103305979B discloses a hollow spindle with grooved design for low fiber shedding in air jet vortex spinning. It has transverse grooves and vertical grooves on the inner and outer walls of the arc-shaped cone top. The transverse grooves are located on the inner wall of the arc-shaped cone top of the hollow spindle, and the matching vertical grooves are located on the outer wall of the arc-shaped cone top. Both are arranged around the yarn forming channel of the hollow spindle. The transverse grooves are perpendicular to the axis of the hollow spindle, and the vertical grooves are parallel to the axis. The function of the transverse and vertical grooves is to increase the mechanical contact area between the fiber and the cone top wall, thereby directly increasing the friction between the fiber and the wall, thus counteracting the axial pulling force of the high-pressure airflow on the free end fiber. The core is the enhancement of mechanical friction.

[0044] The annular groove 13 of this patent is an independent annular structure that is circumferentially closed and has no matching groove. It forms a low-pressure vortex in the groove by the flow separation phenomenon generated when the airflow flows through the groove. The pressure difference between the inside and outside of the groove is used to press the fiber tightly against the wall of the first cylindrical hole 7, which indirectly increases the friction between the fiber and the wall. The core is fluid dynamic pressure difference adsorption.

[0045] Although both aim to reduce fiber shedding, the transverse groove enhances mechanical friction, while the annular groove uses hydrodynamic pressure difference adsorption. Their working principles are different, and they are also completely different in terms of installation position, structural parameters, and applicable scenarios. They are respectively adapted to two core components: hollow spindles and yarn-drawing cones. On the other hand, since the transverse groove is located on the top of the arc-shaped cone, the difference in length between the upper and lower end faces is large, and it is also impossible to effectively form a low-pressure eddy current in the groove.

[0046] As a preferred embodiment, when multiple annular grooves 13 are provided, the annular grooves 13 are arranged sequentially along the axial direction of the first cylindrical hole 7 to form an axially continuous low-pressure adsorption zone, avoiding adsorption discontinuity and preventing the fiber from being pulled out by high-pressure airflow in the non-adsorption area. At the same time, the axial arrangement also ensures the smoothness of the airflow in the hole along the axial direction, and will not cause airflow turning disorder due to the chaotic distribution of grooves.

[0047] As a preferred embodiment, the number of annular grooves 13 is 1 to 4, and the number is precisely controlled to balance the adsorption effect and airflow stability.

[0048] In a preferred embodiment, the diameter of the first cylindrical hole 7 is 1.0 mm to 1.5 mm.

[0049] As a preferred embodiment, the bottom surface 14 of the annular groove 13 is parallel to the wall surface 12, and the first side 15 of the annular groove 13 located upstream and the second side 16 located downstream are both perpendicular to the wall surface 12. The rectangular cross-section design can ensure uniform circumferential adsorption force.

[0050] In a preferred embodiment, the axial distance between the upstream first side 15 and the downstream second side 16 of the annular groove 13 is 0.05mm to 0.3mm.

[0051] In a preferred embodiment, the radial distance between the bottom surface 14 of the annular groove 13 and the wall surface 12 of the first cylindrical hole 7 is 0.04 mm to 0.1 mm.

[0052] As a preferred embodiment, the distance between the first side 15 of the annular groove 13 closest to the inlet 6 of the first cylindrical hole 7 and the upper end point of the yarn-drawing cone 1 is 0.05mm~0.2mm, and the distance between the second side 16 of the annular groove 13 furthest from the inlet 6 of the first cylindrical hole 7 and the upper end point of the yarn-drawing cone 1 is no more than 0.5mm.

[0053] In a preferred embodiment, the distance between the two nearest sides of the adjacent annular grooves 13 is 0.05mm to 0.2mm.

[0054] In this invention, a highly efficient fiber control system is constructed by further refining the design of various parameters of the annular groove.

[0055] The following detailed description, in conjunction with specific embodiments, provides further details.

[0056] Example 1

[0057] Figures 3 to 5 This embodiment illustrates a low-drop fiber jet vortex spinning yarn-guiding cone 1. The yarn-guiding cone 1 includes a first frustum section 2, a second frustum section 3, a first cylindrical section 4, and a second cylindrical section 5, which are sequentially connected and coaxially arranged from upstream to downstream. Inside the yarn-guiding cone 1, a first cylindrical hole 7, a second cylindrical hole 8, a first frustum hole 9, a second frustum hole 10, and a third cylindrical hole 11 are sequentially connected and coaxially arranged from upstream to downstream. An annular groove 13 is provided on the wall 12 of the first cylindrical hole 7 near the inlet 6.

[0058] In this embodiment, the diameter of the first cylindrical hole 7 is 1.3 mm. The distance between the upstream first side 15 and the downstream second side 16 of the annular groove 13 is 0.3 mm. The radial distance between the bottom surface 14 and the wall surface 12 of the annular groove 13 is 0.08 mm. The distance between the first side 15 of the annular groove 13 and the upper end point of the yarn-drawing cone 1 is 0.05 mm, and the distance between the second side 16 of the annular groove 13 and the upper end point of the yarn-drawing cone 1 is 0.35 mm.

[0059] Using cotton fibers with a main body length of 30mm as raw material, the yarn guide cone 1 and the air jet vortex spinning nozzle device 17 of this embodiment are used to spin air jet vortex spun pure cotton yarn with a linear density of 21 tex under a nozzle air pressure of 0.55MPa. Compared with the prior art, which uses a yarn guide cone without an annular groove 13 on the wall surface 12 of the first cylindrical hole 7, but with the same other structural parameters, the amount of fiber loss in the air jet vortex pure cotton yarn spun using the yarn guide cone 1 of this embodiment is reduced by 38% under the above working conditions. The fiber raw material is utilized more fully and efficiently without increasing the air consumption of the equipment, reducing fiber loss and waste of raw materials.

[0060] Example 2

[0061] Figures 8 to 10 Another embodiment of a low-drop-fiber jet vortex spinning yarn-drawing cone 1 is shown. This embodiment differs from Embodiment 1 in that four annular grooves 13 are provided on the wall 12 near the inlet 6 of the first cylindrical hole 7. The distance between the upstream first side 15 and the downstream second side 16 of the annular groove 13 is 0.05 mm, and the radial distance between the bottom surface 14 of the annular groove 13 and the wall 12 is 0.1 mm. The distance between the first side 15 of the annular groove 13 closest to the inlet 6 of the first cylindrical hole 7 and the upper end point of the yarn-drawing cone 1 is 0.08 mm. The distance between the second side 16 of the annular groove 13 furthest from the inlet 6 of the first cylindrical hole 7 and the upper end point of the yarn-drawing cone 1 is 0.43 mm. The distance between the two closest sides of adjacent annular grooves 13 is 0.05 mm.

[0062] Using cotton fibers with a main body length of 30mm as raw material, the yarn-drawing cone 1 and the air-jet vortex spinning nozzle device 17 of this embodiment are used to spin air-jet vortex spun pure cotton yarn with a linear density of 21 tex under a nozzle air pressure of 0.55MPa. Compared with the prior art, which uses a yarn-drawing cone without an annular groove 13 on the wall surface 12 of the first cylindrical hole 7, but with the same other structural parameters, the amount of fiber loss in the air-jet vortex pure cotton yarn spun using the yarn-drawing cone 1 of this embodiment is reduced by 42% under the above working conditions. The fiber raw material is utilized more fully and efficiently without increasing the air consumption of the equipment, reducing fiber loss and waste of raw materials.

[0063] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A jet-driven vortex spinning cone for low-drop fiber, characterized in that, The yarn-drawing cone (1) includes a first frustum section (2), a second frustum section (3), a first cylindrical section (4), and a second cylindrical section (5) arranged coaxially from upstream to downstream. The yarn-drawing cone (1) has a first cylindrical hole (7), a second cylindrical hole (8), a first frustum hole (9), a second frustum hole (10), and a third cylindrical hole (11) arranged coaxially from upstream to downstream. The first cylindrical hole (7) has one or more annular grooves (13) on the wall (12) near the entrance (6).

2. The jet vortex spinning cone for low-drop fiber as described in claim 1, characterized in that, When multiple annular grooves (13) are provided, the annular grooves (13) are arranged sequentially along the axial direction of the first cylindrical hole (7).

3. The jet vortex spinning cone for low-drop fiber as described in claim 1, characterized in that, The number of the annular grooves (13) is 1 to 4.

4. The jet-jet vortex spinning cone for low-drop fiber as described in claim 1, characterized in that, The diameter of the first cylindrical hole (7) is 1.0 mm to 1.5 mm.

5. The jet vortex spinning cone for low-drop fiber as described in claim 1, characterized in that, The bottom surface (14) of the annular groove (13) is parallel to the wall surface (12), and the first side (15) of the annular groove (13) located upstream and the second side (16) located downstream are both perpendicular to the wall surface (12).

6. The jet vortex spinning cone for low-drop fiber as described in claim 5, characterized in that, The axial distance between the upstream first side (15) and the downstream second side (16) of the annular groove (13) is 0.05mm~0.3mm.

7. The jet vortex spinning cone for low-drop fiber as described in claim 5, characterized in that, The radial distance between the bottom surface (14) of the annular groove (13) and the wall surface (12) of the first cylindrical hole (7) is 0.04mm~0.1mm.

8. The jet vortex spinning cone for low-drop fiber as described in claim 5, characterized in that, The distance between the first side (15) of the annular groove (13) closest to the inlet (6) of the first cylindrical hole (7) and the upper end of the yarn-drawing cone (1) is 0.05mm~0.2mm, and the distance between the second side (16) of the annular groove (13) furthest from the inlet (6) of the first cylindrical hole (7) and the upper end of the yarn-drawing cone (1) is no more than 0.5mm.

9. The jet vortex spinning cone for low-drop fiber as described in claim 5, characterized in that, The distance between the two closest sides of the adjacent annular groove (13) is 0.05mm to 0.2mm.

10. A jet vortex spinning nozzle device, comprising the yarn guide cone as described in any one of claims 1-9, characterized in that: The nozzle device (17) is provided with a fiber guiding assembly (19), a vortex tube (20), a yarn guiding cone (1) and a yarn guiding tube (23) from upstream to downstream. The fiber guiding assembly (19), the vortex tube (20), the yarn guiding cone (1) and the yarn guiding tube (23) are installed inside the nozzle housing (28). The fiber guide assembly (19) consists of a guide body (19a), a guide body housing (19b) and a guide needle (19c), and a fiber guide channel (30) is formed between the guide body and the guide body housing. The vortex tube (20) has a cylindrical space (27) for introducing fiber bundles (18) and airflow jet holes (29) evenly distributed along the circumference on the wall of the vortex tube (20). The head end of the yarn-drawing cone (1) is located in the cylindrical space (27) inside the vortex tube (20), and a yarn-drawing tube (23) is provided downstream of the yarn-drawing cone (1).

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