Air-jet vortex spinning vortex tube capable of spinning yarn with compact structure

Abstract

The invention relates to an air-jet vortex spinning vortex tube capable of spinning yarns with compact structures, a first cylindrical hole, a second cylindrical hole, a first circular-truncated-cone-shaped hole and a second circular-truncated-cone-shaped hole which are communicated and coaxially arranged are sequentially formed in the vortex tube from upstream to downstream, and the diameter of an inlet of the second circular-truncated-cone-shaped hole is equal to that of an outlet of the first circular-truncated-cone-shaped hole; the second cylindrical hole, the first circular-truncated-cone-shaped hole and the second circular-truncated-cone-shaped hole form a vortex cavity, the vortex tube is provided with a plurality of airflow jet holes, openings of the airflow jet holes are communicated with the vortex cavity and penetrate through the vortex tube, outlets of the airflow jet holes incline in the downstream direction relative to inlets, and the airflow jet holes are evenly distributed in the circumferential direction of the vortex tube at equal intervals. According to the vortex tube, by accurately controlling the sizes and the positions of the second cylindrical hole, the first circular-truncated-cone-shaped hole and the airflow jet hole, yarn spun through the vortex tube has a more compact structure, it is guaranteed that the yarn has excellent mechanical performance, and high-quality production of air-jet vortex yarn is facilitated.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of spinning machines, in particular to a vortex tube for air-jet vortex spinning capable of spinning compact yarns. BACKGROUND

[0002] Air-jet vortex yarn is a yarn with double structure of vortex tube for air-jet vortex spinning capable of spinning compact yarns. The core fibers of the yarn are arranged in parallel and have no twist. Air-jet vortex spinning relies on the action of high-speed rotating airflow to make the free fibers at the tail end wrap around the outside of the core fibers to twist into yarn. Therefore, the degree of internal and external transfer of fibers in the yarn is low, the structure of the yarn is relatively loose, and the strength of the yarn is lower than that of ring yarn, which affects its use. The vortex tube is a key component for air-jet vortex spinning yarn. Its structure and geometric size have an important influence on the movement of fibers during twisting, thereby affecting the structure and performance of the final yarn.

[0003] Chinese invention patent application with publication number CN117166095A discloses a yarn nozzle device for air-jet vortex spinning with low air consumption. By optimizing the size of the vortex tube channel and the parameters of the airflow injection hole, the air consumption during spinning is effectively reduced. However, this device does not design for yarn structure compactness, and the spun yarn still has problems of loose fiber wrapping and insufficient mechanical strength, which limits its application in high-end textile scenarios.

[0004] Therefore, the present technical field needs to solve the problem of how to provide a vortex tube for air-jet vortex spinning capable of spinning compact yarns, so that the spun yarn has a more compact structure to ensure that the spun yarn has excellent mechanical properties. SUMMARY

[0005] The main purpose of the present application is to provide a vortex tube for air-jet vortex spinning capable of spinning compact yarns, which can effectively solve the problems in the background art.

[0006] To achieve the above purpose, the present application is implemented by the following technical solutions:

[0007] The jet vortex spinning vortex tube of the application is characterized in that: the inside of the vortex tube is sequentially provided with a first cylindrical hole, a second cylindrical hole, a first circular truncated cone hole and a second circular truncated cone hole which are connected and coaxially arranged from upstream to downstream, the diameter of the second circular truncated cone hole at the inlet is equal to the diameter of the first circular truncated cone hole at the outlet, the second cylindrical hole, the first circular truncated cone hole and the second circular truncated cone hole constitute a vortex cavity, a plurality of airflow injection holes are arranged on the vortex tube and connected with the vortex cavity and penetrating through the vortex tube, the outlet of the airflow injection hole is inclined to the downstream direction relative to the inlet, the airflow injection holes are uniformly distributed along the circumference of the vortex tube at equal intervals, the diameter of the second cylindrical hole is 11%-12% of the length of the spun fiber body, the axial length of the second cylindrical hole is 7%-9% of the length of the spun fiber body, the diameter of the first circular truncated cone hole at the inlet is 12%-14% of the length of the spun fiber body, the length d of the common perpendicular line segment between the axis of the airflow injection hole and the axis of the vortex tube is 33%-47% of the diameter of the first circular truncated cone hole at the inlet, and the included angle a between the axis of the airflow injection hole and the axis of the vortex tube is 55-70 degrees.

[0008] Preferably, the diameter of the second cylindrical hole is not greater than the diameter of the first circular truncated cone hole at the inlet.

[0009] Preferably, the diameter of the airflow injection hole at the outlet is 0.55-0.7mm.

[0010] Preferably, the number of the airflow injection holes is 3-6.

[0011] Preferably, the perpendicular distance between the intersection of the axis of the airflow injection hole and the cylindrical surface with the axis of the vortex tube and the diameter of the second cylindrical hole and the outlet cross section of the second cylindrical hole is not greater than 0.8 times the diameter of the airflow injection hole at the outlet.

[0012] The jet vortex spinning vortex tube of the application is characterized in that: the inside of the vortex tube is sequentially provided with a first cylindrical hole, a second cylindrical hole, a first circular truncated cone hole and a second circular truncated cone hole which are connected and coaxially arranged from upstream to downstream, the diameter of the second circular truncated cone hole at the inlet is equal to the diameter of the first circular truncated cone hole at the outlet, the second cylindrical hole, the first circular truncated cone hole and the second circular truncated cone hole constitute a vortex cavity, a plurality of airflow injection holes are arranged on the vortex tube and connected with the vortex cavity and penetrating through the vortex tube, the outlet of the airflow injection hole is inclined to the downstream direction relative to the inlet, the airflow injection holes are uniformly distributed along the circumference of the vortex tube at equal intervals, the diameter of the second cylindrical hole is 11%-12% of the length of the spun fiber body, the axial length of the second cylindrical hole is 7%-9% of the length of the spun fiber body, the diameter of the first circular truncated cone hole at the inlet is 12%-14% of the length of the spun fiber body, the length d of the common perpendicular line segment between the axis of the airflow injection hole and the axis of the vortex tube is 33%-47% of the diameter of the first circular truncated cone hole at the inlet, and the included angle a between the axis of the airflow injection hole and the axis of the vortex tube is 55-70 degrees.

[0013] The vortex tube of the present application sets the diameter of the second cylindrical hole to be 11-12% of the length of the spun fiber body, sets the axial length to be 7-9% of the length of the spun fiber body, sets the diameter at the entrance of the first circular truncated cone hole to be 12-14% of the length of the spun fiber body, makes the diameter of the second cylindrical hole not greater than the diameter at the entrance of the first circular truncated cone hole, sets the diameter at the exit of the airflow injection hole to be 0.55-0.7 mm, sets the length of the common perpendicular segment of the airflow injection hole axis and the vortex tube axis to be 33-47% of the diameter at the entrance of the first circular truncated cone hole, sets the included angle between the airflow injection hole axis and the vortex tube axis to be 55-70°, sets the number of the airflow injection holes to be 3-6, and makes the perpendicular distance from the intersection of the airflow injection hole axis and the cylindrical surface with the vortex tube axis as the axis and the diameter of the second cylindrical hole as the diameter to the exit section of the second cylindrical hole not greater than 0.8 times the diameter at the exit of the airflow injection hole, so that the air-jet vortex spinning nozzle can spin yarns that are more compact than the yarns spun by the prior art structure under the working condition that the total air pressure in the air chamber is 0.4-0.65 MPa, and can effectively improve the mechanical properties of the air-jet vortex yarns. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 Figure 1 is a longitudinal sectional view of the air-jet vortex spinning nozzle device of the present application;

[0015] Figure 2 Figure 2 is a perspective view of the vortex tube of Example 1 of the present application;

[0016] Figure 3 Figure 3 is a longitudinal sectional view of the vortex tube of Example 1 of the present application;

[0017] Figure 4 Figure 4 is a transverse sectional view of the airflow injection hole position of the vortex tube of Example 1 of the present application;

[0018] Figure 5 Figure 5 is a longitudinal sectional view of the vortex tube of Example 2 of the present application;

[0019] Figure 6 Figure 6 is a transverse sectional view of the airflow injection hole position of the vortex tube of Example 2 of the present application.

[0020] Figure 7 Figure 7 is a longitudinal sectional view of the vortex tube of Example 3 of the present application;

[0021] Figure 8 Figure 8 is a transverse sectional view of the airflow injection hole position of the vortex tube of Example 3 of the present application. DETAILED DESCRIPTION

[0022] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described below in conjunction with the accompanying drawings of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall into the scope of protection of the present application.

[0023] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0024] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited. In addition, the terms "mounting", "connecting", "connection" should be broadly understood, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between the two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0025] With reference to Figure 1 The vortex tube 1 is located inside the air jet vortex spinning nozzle device 12. The nozzle device 12 is provided with a fiber guide assembly 13, a vortex tube 1, a yarn guide cone 14 and a yarn guide tube 15 from upstream to downstream in sequence. The fiber guide assembly 13, the vortex tube 1, the yarn guide cone 14 and the yarn guide tube 15 are mounted in the nozzle housing 16.

[0026] The fiber guide assembly 13 is provided with a guide body 17 and a guide needle 18, and is formed with a fiber guide channel 19 for guiding the fiber bundle delivered by the drafting device not shown in the figure into the inside of the nozzle device 12.

[0027] The head end portion of the yarn guide cone 14 is located inside the vortex tube 1 for supporting the tail end of the fiber when the tail end of the fiber in the fiber bundle is laid down on the outer wall surface of the head end of the yarn guide cone 14 and rotates with the high-speed rotating airflow.

[0028] With reference to Figures 2 to 6 The present application provides a vortex tube for air-jet vortex spinning for spinning compact yarns, which comprises a first cylindrical hole 2, a second cylindrical hole 3, a first circular truncated cone hole 4 and a second circular truncated cone hole 5 arranged in sequence from upstream to downstream inside the vortex tube 1 and connected in communication and coaxially, the diameter of the inlet of the second circular truncated cone hole 5 is equal to the diameter of the outlet of the first circular truncated cone hole 4, the second cylindrical hole 3, the first circular truncated cone hole 4 and the second circular truncated cone hole 5 form a vortex chamber 6, a plurality of airflow injection holes 7 are arranged on the vortex tube 1 and connected in communication with the vortex chamber 6 and penetrate through the vortex tube 1, the outlet of the airflow injection hole 7 is inclined to the downstream direction relative to the inlet, the airflow injection holes 7 are uniformly distributed along the circumference of the vortex tube 1 at equal intervals, and are used for forming a high-speed rotating airflow 10.

[0029] The diameter of the second cylindrical hole 3 is 11% to 12% of the length of the spun fiber, the axial length of the second cylindrical hole 3 is 7% to 9% of the length of the spun fiber, the diameter of the inlet of the first circular truncated cone hole 4 is 12% to 14% of the length of the spun fiber, the length d of the common perpendicular segment between the axis 8 of the airflow injection hole 7 and the axis 9 of the vortex tube 1 is 33% to 47% of the diameter of the inlet of the first circular truncated cone hole 4, and the included angle α between the axis 8 of the airflow injection hole 7 and the axis 9 of the vortex tube 1 is 55° to 70°.

[0030] In the present application, the diameter of the second cylindrical hole 3 of the vortex tube 1 is set to be 11% to 12% of the length of the spun fiber, so that the moment of momentum of the high-speed rotating airflow 10 acting on the fiber bundle is appropriate in size, which is beneficial to the smooth and stable conveying of the fiber bundle into the yarn guide cone 14 in a tight state around the guide needle 18, thereby reducing the fiber loss;

[0031] The axial length of the second cylindrical hole 3 of the vortex tube 1 is set to be 7% to 9% of the length of the spun fiber, so that the axial drag of the high-speed rotating airflow 10 acting on the tail end of the fiber is appropriate in size, which is beneficial to the tail end of the fiber being laid down on the outer wall surface of the head end of the yarn guide cone 14 to become tail end free fibers;

[0032] The diameter of the inlet of the first circular truncated cone hole 4 of the vortex tube 1 is set to be 12% to 14% of the length of the spun fiber, so that the moment of momentum of the high-speed rotating airflow 10 acting on the tail end free fibers is appropriate in size, which is beneficial to the rotational wrapping movement of the fibers along the circumference of the yarn guide cone 14 to form a more compact yarn structure.

[0033] The length of the common perpendicular segment d between the axis 8 of the air flow jetting hole 7 and the axis 9 of the vortex tube 1 is set to be 33%~47% of the diameter at the entrance of the first circular truncated cone hole 4, so that the high-speed jet flow jetted from the air flow jetting hole 7 can more effectively act on the tail-end free fibers, thereby improving the twisting intensity of the fibers and making the fibers more tightly wrapped on the yarn body;

[0034] The included angle a between the axis 8 of the air flow jetting hole 7 and the axis 9 of the vortex tube 1 is set to be 55°~70°, so that the ratio of the axial component and the circumferential component of the high-speed jet flow jetted from the air flow jetting hole 7 is reasonable, which can not only ensure the smooth transportation of the fibers along the axis of the vortex tube 1, but also ensure the twisting efficiency of the fibers.

[0035] As a preferred embodiment, the diameter of the second cylindrical hole 3 is not greater than the diameter at the entrance of the first circular truncated cone hole 4.

[0036] As a preferred embodiment, the diameter at the outlet of the air flow jetting hole 7 is 0.55 mm~0.7 mm, so that the high-speed rotating air flow 10 formed in the vortex tube 1 has sufficient strength, thereby driving the fibers to perform the rotating wrapping movement in the vortex tube 1.

[0037] As a preferred embodiment, the number of the air flow jetting holes 7 is 3~6.

[0038] As a preferred embodiment, the perpendicular distance between the intersection of the axis 8 of the air flow jetting hole 7 and the cylindrical surface with the axis 9 of the vortex tube 1 as the axis and the diameter of the second cylindrical hole 3 as the diameter and the outlet cross section of the second cylindrical hole 3 is not greater than 0.8 times of the diameter at the outlet of the air flow jetting hole 7, which is beneficial to the high-speed jet flow at the outlet of the air flow jetting hole 7 to enter the vortex tube 1 at a high speed, thereby improving the rotating intensity of the fibers along the circumference of the yarn cone 14, and then improving the tightness of the yarn.

[0039] It should be noted that the outlet of the air flow jetting hole 7 can be arranged on the wall surface of the second cylindrical hole 3, or on the wall surface of the first circular truncated cone hole 4.

[0040] The vortex tube 1 of the present application can make the yarn spun by the vortex tube 1 have a more compact structure by precisely controlling the size and position of the second cylindrical hole 3, the first circular truncated cone hole 4 and the air flow jetting hole 7, so as to ensure excellent mechanical properties and facilitate the high-quality production of air-jet vortex yarn.

[0041] The present application will be further described below in conjunction with specific examples.

[0042] Example 1

[0043] The viscose fiber with a fiber main length of 38 mm is used as raw material, and the jet vortex pure viscose yarn with a linear density of 20 tex is spun by using the vortex tube 1 under a nozzle air pressure of 0.6 MPa.

[0044] Referring to Figures 2 to 4 The vortex tube 1 is roughly a rotary body composed of four cylinders with different diameters, and the first cylindrical hole 2, the second cylindrical hole 3, the first circular truncated cone hole 4 and the second circular truncated cone hole 5 are sequentially arranged in the vortex tube 1 from upstream to downstream.

[0045] In the embodiment, the diameter of the second cylindrical hole 3 is 4.2 mm, which is 11.1% of the main length of the spun fiber, and the axial length is 3.1 mm, which is 8.2% of the main length of the spun fiber. The diameter of the first circular truncated cone hole 4 at the inlet is 4.7 mm, which is 12.4% of the main length of the spun fiber. The second cylindrical hole 3, the first circular truncated cone hole 4 and the second circular truncated cone hole 5 constitute the vortex chamber 6.

[0046] The vortex tube 1 is provided with six airflow injection holes 7 which are in communication with the vortex chamber 6 and pass through the vortex tube 1, and are uniformly distributed along the circumference of the vortex tube 1 at equal intervals. The outlet of the airflow injection hole 7 is inclined to the downstream direction relative to the inlet. The inlet of the airflow injection hole 7 is in communication with the air chamber which is not shown in the figure. Compressed air enters the air chamber from the compressed air source which is not shown in the figure, and then enters the vortex chamber 6 inside the vortex tube 1 through the airflow injection hole 7, so as to form a high-speed rotating airflow 10 in the vortex chamber 6 for twisting the fiber bundle.

[0047] In the embodiment, the diameter of the airflow injection hole 7 at the outlet is 0.55 mm, the included angle α between the axis 8 of the airflow injection hole 7 and the axis 9 of the vortex tube 1 is 65°, and the length of the common perpendicular segment d of the axis 8 of the airflow injection hole 7 and the axis 9 of the vortex tube 1 is 1.9 mm, which is 40.4% of the diameter of the first circular truncated cone hole 4 at the inlet. The intersection of the axis 8 of the airflow injection hole 7 and the cylindrical surface with the axis 9 of the vortex tube 1 as the axis and the diameter of the second cylindrical hole 3 as the diameter is located upstream of the outlet cross section of the second cylindrical hole 3, and the perpendicular distance from the intersection to the outlet cross section of the second cylindrical hole 3 is 0.32 mm, which is 0.58 times the diameter of the airflow injection hole 7 at the outlet.

[0048] The jet vortex viscose yarns are spun by using the vortex tube 1 of the prior art and the vortex tube 1 of the embodiment under the above working conditions. The fiber bulk density of the jet vortex viscose yarn spun by using the vortex tube 1 of the prior art is 0.475, and the breaking strength is 12.30 cN / tex. The fiber bulk density of the jet vortex viscose yarn spun by using the vortex tube 1 of the embodiment is 0.518, and the breaking strength is 13.16 cN / tex. The fiber bulk density is increased by 9%, and the breaking strength is increased by 7%. It can be seen that, by precisely controlling the size and position of the second cylindrical hole 3, the first circular truncated cone hole 4 and the airflow injection hole 7, the yarn spun by the vortex tube 1 has a more compact structure, thereby having excellent mechanical properties, which is beneficial to the high-quality production of the jet vortex yarn.

[0049] Embodiment 2

[0050] The combed cotton fibers with a body length of 32 mm are used as raw materials, and the jet vortex pure cotton yarn with a linear density of 18 tex is spun by using the vortex tube 1 of the embodiment under a nozzle air pressure of 0.65 MPa.

[0051] Figures 5 to 6 The vortex tube 1 has a general shape of a rotary body composed of four cylinders with different diameters. The first cylindrical hole 2, the second cylindrical hole 3, the first circular truncated cone hole 4 and the second circular truncated cone hole 5 are sequentially arranged in the vortex tube 1 from upstream to downstream.

[0052] In the embodiment, the diameter of the second cylindrical hole 3 is 3.9 mm, which is 12% of the body length of the spun fiber. The axial length of the second cylindrical hole 3 is 2.8 mm, which is 8.8% of the body length of the spun fiber. The diameter of the first circular truncated cone hole 4 at the inlet is 3.9 mm, which is 12% of the body length of the spun fiber. The second cylindrical hole 3, the first circular truncated cone hole 4 and the second circular truncated cone hole 5 constitute the vortex chamber 6.

[0053] The vortex tube 1 is provided with five airflow injection holes 7 which are in communication with the vortex chamber 6 and penetrate through the vortex tube 1, and are uniformly distributed along the circumference of the vortex tube 1 at equal intervals. The outlet of the airflow injection hole 7 is inclined to the downstream direction relative to the inlet. The inlet of the airflow injection hole 7 is in communication with an air chamber which is not shown in the figure. Compressed air enters the air chamber from a compressed air source which is not shown in the figure, and then enters the vortex chamber 6 inside the vortex tube 1 through the airflow injection hole 7, thereby forming a high-speed rotating airflow 10 in the vortex chamber 6 for twisting the fiber bundle.

[0054] In the present embodiment, the diameter of the airflow injection hole 7 at the outlet is 0.65 mm, the included angle a between the axis 8 of the airflow injection hole 7 and the axis 9 of the vortex tube 1 is 55°, the length of the common perpendicular segment d of the axis 8 of the airflow injection hole 7 and the axis 9 of the vortex tube 1 is 1.6 mm, which is 41% of the diameter at the inlet of the first circular truncated cone-shaped hole 4. The intersection point of the axis 8 of the airflow injection hole 7 and the cylindrical surface with the axis 9 of the vortex tube 1 as the axis and with the diameter of the second cylindrical hole 3 as the diameter is located upstream of the outlet cross section of the second cylindrical hole 3, and the perpendicular distance from the intersection point to the outlet cross section of the second cylindrical hole 3 is 0 mm, that is, the axis of the airflow injection hole 7 intersects with the intersection line of the second cylindrical hole 3 and the first circular truncated cone-shaped hole 4.

[0055] The existing technology and the vortex tube 1 according to the present embodiment are respectively used to spin the air-jet vortex pure cotton yarn under the above working condition, the fiber bulk density of the air-jet vortex viscose yarn spun by the existing technology is 0.467, and the breaking strength is 10.23 cN / tex; the fiber bulk density of the air-jet vortex viscose yarn spun by the vortex tube 1 according to the present embodiment is 0.518, and the breaking strength is 11.05 cN / tex, the fiber bulk density is increased by 11%, and the breaking strength is increased by 8%, it can be seen that by precisely controlling the size and position of the second cylindrical hole 3, the first circular truncated cone-shaped hole 4 and the airflow injection hole 7, the yarn spun by the present vortex tube 1 has a more compact structure, thereby having excellent mechanical properties, which is beneficial to the high-quality production of the air-jet vortex yarn.

[0056] Embodiment 3

[0057] Figures 7 to 8 A vortex tube 1 for spinning a compact yarn according to embodiment 3 is shown. The present embodiment differs from embodiment 1 in that the vortex tube 1 is provided with four airflow injection holes 7, the included angle a between the axis 8 of the airflow injection hole 7 and the axis 9 of the vortex tube 1 is 60°, the intersection point of the axis 8 of the airflow injection hole 7 and the cylindrical surface with the axis 9 of the vortex tube 1 as the axis and with the diameter of the second cylindrical hole 3 as the diameter is located downstream of the outlet cross section of the second cylindrical hole 3, and the perpendicular distance from the intersection point to the outlet cross section of the second cylindrical hole 3 is 0.31 mm, which is 0.56 times the diameter at the outlet of the airflow injection hole 7.

[0058] The viscose fiber with a fiber main length of 38 mm is used as raw material to spin the air-jet vortex viscose yarn with a linear density of 18 tex under the same working condition as that of the embodiment 1. The fiber bulk density of the air-jet vortex viscose yarn spun by the prior art is 0.481, and the breaking strength is 12.38 cN / tex. The fiber bulk density of the air-jet vortex viscose yarn spun by the vortex tube 1 of the embodiment is 0.539, and the breaking strength is 13.62 cN / tex. The fiber bulk density is increased by 12%, and the breaking strength is increased by 10%. It can be seen that, by precisely controlling the size and position of the second cylindrical hole 3, the first circular truncated cone hole 4 and the air flow injection hole 7, the yarn spun by the vortex tube 1 has a more compact structure, thereby having excellent mechanical properties, and being beneficial to the high-quality production of the air-jet vortex yarn.

[0059] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit the same. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalent ones. The modification or replacement does not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A jet vortex spinning tube for spinning dense yarns, wherein the vortex tube (1) has a first cylindrical hole (2), a second cylindrical hole (3), a first frustum hole (4), and a second frustum hole (5) arranged coaxially from upstream to downstream, the diameter of the inlet of the second frustum hole (5) being equal to the diameter of the outlet of the first frustum hole (4), the second cylindrical hole (3), the first frustum hole (4), and the second frustum hole (5) forming a vortex cavity (6), and the vortex tube (1) having a plurality of air jet holes (7) with openings connected to and penetrating the vortex cavity (6), the outlet of the air jet holes (7) being inclined downstream relative to the inlet, and the air jet holes (7) being evenly distributed at equal intervals along the circumference of the vortex tube (1), characterized in that: The diameter of the second cylindrical hole (3) is 11% to 12% of the length of the spun fiber body, and the axial length is 7% to 9% of the length of the spun fiber body. The diameter at the entrance of the first frustum-shaped hole (4) is 12% to 14% of the length of the spun fiber body. The length d of the common perpendicular segment between the axis (8) of the airflow jet hole (7) and the axis (9) of the vortex tube (1) is 33% to 47% of the diameter at the entrance of the first frustum-shaped hole (4). The included angle α between the axis (8) of the airflow jet hole (7) and the axis (9) of the vortex tube (1) is 55° to 70°.

2. The jet vortex spinning tube for spinning densely structured yarns according to claim 1, characterized in that, The diameter of the second cylindrical hole (3) is not greater than the diameter at the entrance of the first frustum-shaped hole (4).

3. The jet vortex spinning tube for spinning densely structured yarns according to claim 1, characterized in that, The diameter at the outlet of the airflow injection hole (7) is 0.55 mm to 0.7 mm.

4. The jet vortex spinning tube for spinning densely structured yarns according to claim 1, characterized in that, The number of airflow injection holes (7) is 3 to 6.

5. The jet vortex spinning tube for spinning densely structured yarns according to claim 1, characterized in that, The perpendicular distance between the intersection of the axis (8) of the airflow jet hole (7) and the cylindrical surface with the axis (9) of the vortex tube (1) as the axis and the diameter of the second cylindrical hole (3) as the diameter and the outlet section of the second cylindrical hole (3) is not greater than 0.8 times the diameter at the outlet of the airflow jet hole (7).

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