An auxiliary nozzle for air-jet looms

Abstract

The application discloses an auxiliary nozzle for air-jet looms, which comprises a pipe body with an air channel inside, and a gas hole with an air outlet circular hole and two side air outlet holes is arranged at the end of the pipe body and is connected with the air channel inside, the air outlet circular hole is located on the center line of the pipe body, the two side air outlet holes are symmetrically arranged on both sides of the center line of the pipe body, the air flow extension lines of the two side air outlet holes are all inclined to the direction of the air flow extension line of the air outlet circular hole, and the three air flow extension lines intersect at the same intersection point; the air channel comprises an air inlet pipe section and a steady flow section, wherein the steady flow section comprises a main air channel and at least one auxiliary air channel, the air inlet of the main air channel is connected with the air inlet pipe section, the air outlet is connected with the air outlet circular hole, the air inlet of the auxiliary air channel is connected with the air inlet pipe section, and the air outlet is connected with the side air outlet hole. The main jet flow can be effectively assisted and accelerated, and the main jet flow can be converged with the jet flow of the main nozzle at more space angles, so that the flow rate and the beam property of the main jet flow are ensured.

Description

Technical Field

[0001] This invention relates to a nozzle, and more particularly to an auxiliary nozzle for an air-jet loom. Background Technology

[0002] In air-jet looms, weft insertion is achieved by using compressed air jets from the main nozzle to create frictional traction on the weft yarn, guiding it through the warp yarn's shuttle. Multiple auxiliary nozzles then relay this airflow to guide the weft yarn. At the beginning of insertion, the main nozzle jet primarily controls the weft yarn's traction. In subsequent insertion stages, the auxiliary nozzles take over, forming several groups along the insertion path, each individually controlled by a solenoid valve. As a crucial component of weft insertion, the performance of these auxiliary nozzles directly impacts insertion quality and weaving efficiency.

[0003] A common auxiliary nozzle structure generally consists of an auxiliary nozzle circular tube, a transition tube, a flat tube, and a nozzle unit. This type of auxiliary nozzle uses a tapered pipe in the middle transition section to accelerate the airflow in the first stage, and the outlet achieves a second stage of acceleration. However, this structure has the following problems: 1. The acceleration effect is generally poor; 2. The outlet jet concentration is poor; 3. The outlet airflow stability is poor, leading to rapid jet diffusion and a short effective range, thus resulting in a short effective yarn delivery distance for each auxiliary nozzle.

[0004] In actual production, if the outlet air velocity of the auxiliary nozzle is not high, the only way to increase the speed is to increase the air supply pressure, but this comes at the cost of energy consumption, which greatly increases production costs. Reducing air consumption is of great significance for unleashing the production potential of the loom and improving the overall efficiency of weaving. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the present invention provides an auxiliary nozzle for an air-jet loom that can effectively improve jet velocity and focusing properties.

[0006] The technical solution adopted by this invention to solve its technical problem is: an auxiliary nozzle for an air-jet loom, comprising a tube body with an internal air passage, an air hole at the end of the tube body communicating with the internal air passage, and the tube body having an elongated structure.

[0007] The vent includes a circular vent and two side vents. The circular vent is located on the center line of the pipe body, and the two side vents are symmetrically arranged on both sides of the center line of the pipe body. The side vents and the circular vent are on the same straight line. The airflow extension lines of the side vents are inclined toward the airflow extension line of the circular vent, and the three airflow extension lines intersect at the same intersection point.

[0008] The air passage includes an air inlet section and a flow stabilization section. The flow stabilization section includes a main air passage and at least one auxiliary air passage. The air inlet of the main air passage is connected to the air inlet section, and the air outlet is connected to the air outlet hole. The air inlet of the auxiliary air passage is connected to the air inlet section, and the air outlet is connected to the side air outlet hole.

[0009] The beneficial effects of this invention are as follows: The auxiliary nozzle of this application accelerates the airflow in the converging and contracting pipe section, significantly increasing the airflow velocity out of the entire auxiliary nozzle airflow channel. Furthermore, compared to ordinary nozzle outlet holes, the two symmetrically arranged side outlet holes in this application merge with the main jet of the outlet circular hole at a certain spatial angle, thereby increasing the flow velocity and focusing effect. Unlike typical porous structures, the extended lines of the airflow from the two side outlet holes intersect with the extended lines of the airflow from the outlet circular hole at the same intersection point, effectively accelerating the main jet and merging with the main nozzle jet at a greater spatial angle, ensuring the flow velocity and focusing effect of the main jet.

[0010] The configuration is further defined as follows: There are two auxiliary air ducts, arranged adjacent to and symmetrically on both sides of the main air duct. Each auxiliary air duct has a diffuser chamber at its outlet. The side outlets are connected to the auxiliary air ducts via the diffuser chambers. The diffuser chambers gradually expand from the outlets of the auxiliary air ducts towards the side outlets. The diffuser chambers are filled with the converged airflow from the auxiliary air ducts, and their internal pressure is higher than the ambient pressure. This ensures that, under a certain total inlet pressure, the air within the diffuser chamber can fully expand and accelerate, reaching an optimal expansion state, thus resulting in a parallel jet at the outlet, or even a parallel supersonic jet. Furthermore, the volume of the diffuser chamber can be adjusted according to actual conditions to change the airflow velocity at the side outlets.

[0011] A further configuration includes a scaling and acceleration channel between the main air duct's outlet and the outlet orifice. This channel comprises a sequentially connected airflow contraction zone, a throat stabilization zone, and an airflow expansion zone. The airflow contraction zone is connected to the main air duct's outlet, and the airflow expansion zone is connected to the outlet orifice. The airflow contraction zone accelerates the airflow, while the throat stabilization zone ensures the accelerated airflow becomes smooth, and the airflow expansion zone allows the airflow to fully expand and accelerate, reaching its optimal expansion state, thus resulting in a parallel jet at the outlet.

[0012] The configuration is further defined as follows: both the airflow contraction zone and the throat stabilization zone are straight pipes with a circular longitudinal cross-section. The airflow contraction zone is a constricted structure that gradually narrows along the outlet direction, the throat stabilization zone is a straight pipe structure with an equal inner diameter, and the airflow expansion zone is a flared structure that gradually widens along the outlet direction. The length of the airflow contraction zone is *a*, the length of the throat stabilization zone is *b*, the length of the airflow expansion zone is *c*, and the diameter of the throat stabilization zone is *d*, where *a:b* = (4–6):1, *d:b* = (1.2–2):1, and *c:b* = (2–3.5):1. This technical solution is a preferred embodiment.

[0013] Further configuration: the length of the airflow contraction zone is 2.6 mm, the length of the throat stabilization zone is 0.5 mm, and the diameter of the throat stabilization zone is 0.8 mm. This technical solution is a further preferred solution.

[0014] The design is further configured such that the inner surface of the inner wall of the airflow expansion zone, opposite to the outlet orifice and the throat stabilization zone, is a spherical structure, with the center of the sphere located in the direction of the outlet orifice. When the incoming flow in the throat stabilization zone impacts the inner wall of the spherical structure, it quickly and stably changes direction, allowing the changed airflow to be discharged towards the outlet orifice, thereby improving the flow velocity of the main jet at the outlet orifice without excessive attenuation and ensuring good focusing.

[0015] A further configuration is made whereby the opening shape of the side air outlet is an arc structure, with the center of the arc structure facing the direction of the air outlet. The arc structure (approximately fan-shaped) can more effectively assist in accelerating the main jet and merge with the main nozzle jet at a greater spatial angle.

[0016] Further configuration: the central angle of the arc structure is 50° to 70°; the extended lines of the airflow from the side outlets are set at an angle of 15° to 20° with the extended lines of the airflow from the outlet circular holes. The opening structure of the side outlets is an arc structure (approximately fan-shaped), and it assists the outlet circular holes from the side, which can significantly increase the flow velocity and concentration, and the arc structure can more effectively assist in accelerating the main jet.

[0017] A further configuration is provided: a transition section is provided between the intake pipe section and the flow stabilization section, which is a constricted structure with a gradually decreasing volume along the airflow direction.

[0018] The system is further configured such that: a through hole communicating with the outside of the diffuser chamber is formed within the diffuser chamber; an inflatable bladder is attached to the inner wall of the diffuser chamber, and the inflatable bladder has air holes communicating with the through hole; a sealing plug is provided at the through hole to seal the air holes. By inflating and contracting the inflatable bladder, the volume inside the diffuser chamber is changed, and different volumes of diffuser chambers can change the intensity of the airflow ejected from the side outlets to adapt to different inlet total pressures. Furthermore, by adjusting the volume of the diffuser chamber, the intensity of the airflow ejected from the side outlets can also affect the velocity and concentration of the main jet, adapting to different application scenarios and improving the versatility of this solution. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention.

[0020] Figure 2 This is a top view of an embodiment of the present invention.

[0021] Figure 3 This is an isometric structural schematic diagram of an embodiment of the present invention, with the internal channels shown in perspective.

[0022] Figure 4 This is a partial cross-sectional view of an embodiment of the present invention.

[0023] Figure 5 for Figure 4 AA sectional view.

[0024] Figure 6 for Figure 5 The BB sectional view, a longitudinal section sectional view at the location of the air outlet and side air outlet.

[0025] Figure 7 This is a partial cross-sectional schematic diagram of the scaling acceleration channel in an embodiment of the present invention.

[0026] Figure 8 This is another partial cross-sectional view of the scaling acceleration channel according to an embodiment of the present invention, with the addition of a through hole, an air bladder, and a sealing plug.

[0027] Figure 9 This is a velocity cloud map of the external flow field distribution of a conventional auxiliary nozzle.

[0028] Figure 10 This is a velocity cloud map of the external flow field distribution in the cross-section of this embodiment.

[0029] Figure 11 This is a velocity cloud map of the external flow field in the longitudinal section of this embodiment.

[0030] Figure 12 This is a velocity cloud map of the effective weft-guiding airflow region 10 mm from the outlet orifice of a conventional auxiliary nozzle.

[0031] Figure 13 This is a velocity cloud map of the effective weft-guiding airflow region 10mm from the outlet hole in this embodiment.

[0032] Figure 14 This is a graph showing the airflow velocity distribution at the outlet of a conventional auxiliary nozzle as a function of distance.

[0033] Figure 15 This is a graph showing the airflow velocity distribution at the nozzle outlet as a function of distance in this embodiment.

[0034] In the diagram: 1. Inlet section, 2. Transition section, 13. Flow stabilization section, 3. Main air passage, 4. Auxiliary air passage, 5. Converging and accelerating channel, 6. Diffuser chamber, 7. Outlet circular hole, 8. Side outlet hole, 10. Diverter wall, 11. Nozzle outer wall, 12. Outlet inclined surface, 501. Airflow contraction zone, 502. Throat stabilization zone, 503. Airflow expansion zone, 501a. Airflow contraction zone wall, 502a. Throat stabilization zone wall, 503a. Airflow expansion zone inner wall, 503b. Airflow expansion zone outer wall, 6a. Diffuser chamber wall, 91. Through hole, 92. Inflation bladder, 93. Sealing plug, K. Central axis of the inner wall arc of the expansion zone, L. Central axis of the outer wall arc of the expansion zone. Detailed Implementation

[0035] The present invention will now be further described with reference to the accompanying drawings:

[0036] like Figures 1-15 As shown, this embodiment includes a tube with an internal air passage. An air hole connected to the internal air passage is opened at the end of the tube. The tube is elongated. The air hole includes one outlet circular hole 7 and two side outlet holes 8. The outlet circular hole 7 is located on the central axis of the tube. The two side outlet holes 8 are symmetrically arranged on both sides of the central axis of the tube, and the side outlet holes 8 are on the same straight line as the outlet circular hole 7. The extended lines of the airflow from the side outlet holes 8 are inclined towards the extended line of the airflow from the outlet circular hole 7, and the three extended lines of airflow intersect at the same intersection point. In this embodiment, the opening shape of the side outlet hole 8 is an arc structure, with the center of the arc structure facing the direction of the outlet circular hole 7. Since the opening shape of the side air outlet 8 is an arc structure, the central angle of this arc structure is 60°. The angle θ between the central axis Y and the geometric central axis X of the air outlet 7 is 15°, meaning the extended lines of the airflow from both sides of the air outlet form a 15° angle with the extended lines of the airflow from the air outlet circular hole. The intersection point of the central axis Y and the central axis X is O. Because the nozzle of the air outlet circular hole 7 is a circular hole, its jet region diffuses in a conical shape. The function of the side air outlet 8 is twofold: first, to allow for a greater spatial angle convergence with the main nozzle; and second, to more effectively reduce airflow diffusion. Simultaneously, the geometric central axis of the side air outlet 8 intersects with the axis of the central outlet circular hole 7, and the intersection point is located within the core velocity region. Therefore, it can also increase the range of the outlet core velocity region, greatly improving the weft insertion efficiency of a single auxiliary nozzle. Special note: The central angle of the arc structure is any value between 50° and 70°, and the angle between the extended lines of the airflow from the two side air outlets 8 and the extended lines of the airflow from the air outlet circular hole 7 is any value between 15° and 20°.

[0037] In this embodiment, the air passage includes an intake pipe section 1, a transition section 2, and a flow stabilizing section 13 connected in sequence. The intake pipe section 1 is connected to an external air source, and the transition section 2 connects the intake pipe section 1 and the flow stabilizing section 13. The transition section 13 is a constricted structure with a gradually decreasing volume along the airflow direction. Figure 4 The transition segment 2 shown in the image is smaller on the left and larger on the right (from top view) because... Figure 5 The transition section 2 shown in the image is larger on the left and smaller on the right (side view). The reduction in volume of this constricted structure from the side view is much greater than the structural change from the top view. Therefore, the volume change of transition section 2 from left to right is a shrinking state, which is a de facto constriction state. The stabilizing section 13 includes one main air passage 3 and two auxiliary air passages 4. The inlet of the main air passage 3 is connected to the transition section 2 and the inlet pipe section 1, and the outlet of the main air passage 3 is connected to the outlet circular hole 7. The inlets of the auxiliary air passages 4 are connected to the transition section 2 and the inlet pipe section 1, and the outlets of the auxiliary air passages 4 are connected to the side outlet hole 8. Adjacent main air passages 3 and auxiliary air passages 4 are separated by a flow divider wall 10. The inner and outer walls of the main air passage 3 and auxiliary air passages 4 are both straight walls (straight pipe structure) to ensure uniform, straight, and stable airflow. Two auxiliary air ducts 4 are arranged adjacent to and symmetrically on both sides of the main air duct 3. A diffuser chamber 6 is provided at the outlet of each of the two auxiliary air ducts 4. The side outlets 8 are connected to the auxiliary air ducts 4 through the diffuser chamber 6. The diffuser chamber 6 gradually expands from the outlet of the auxiliary air duct 4 towards the side outlets 8. During operation, the diffuser chamber 6 is filled with the converged airflow from the two auxiliary air ducts 4, and its internal pressure is higher than the ambient pressure. This ensures that under a certain total inlet pressure, the air in the diffuser chamber 6 can fully expand and accelerate to reach the optimal expansion state, thus resulting in a parallel jet at the outlet. The volume of the diffuser chamber 6 can be adjusted according to actual conditions.

[0038] In this embodiment, a scaling and acceleration channel 5 is provided between the air outlet of the main air duct 3 and the air outlet circular hole 7. The scaling and acceleration channel 5 includes an airflow contraction zone 501, a throat stabilization zone 502, and an airflow expansion zone 503 connected in sequence. The airflow contraction zone 501 is connected to the air outlet of the main air duct 1 through a transition section 2, and the airflow expansion zone 502 is connected to the air outlet circular hole. The throat stabilization zone 502 is a straight pipe with a circular longitudinal cross-section. The airflow contraction zone 501 is a constricted structure that gradually narrows along the air outlet direction, the throat stabilization zone 502 is a straight pipe structure with an equal inner diameter, and the airflow expansion zone 503 is an flared structure that gradually widens along the air outlet direction.

[0039] In this embodiment, the inner surface of the inner wall of the airflow expansion zone 503, opposite to the air outlet hole 7 and the throat stabilization zone 502, is a spherical structure, and the center of this spherical structure is located in the direction of the air outlet hole 7. Figure 5The side sectional view shows that the airflow contraction zone 501 and the throat stabilization zone 502 are straight pipes with circular cross-sections. The inner wall of the airflow expansion zone 503 consists of two arc segments, with the center of each arc on the outlet inclined surface 12 (located at the nozzle end, as shown in the figure). The angles between the two arc segments and the inclined surface 12 at the outlet orifice 7 are both 90°, ensuring uniform airflow velocity distribution on the cross-section near the outlet orifice 7. The angle α between the central axis K of the arc of the inner wall 503a of the airflow expansion zone and the outlet inclined surface 12 is 90°, and the angle β between the central axis L of the arc of the outer wall 503b of the airflow expansion zone and the outlet inclined surface 12 is 90°. The airflow throat 502 is located at the narrowest point between the airflow contraction zone 501 and the airflow expansion zone 503. The figure shows that the cross-section of the inner wall 503a of the airflow expansion zone 501 is a quarter-circle arc, and the cross-section of the outer wall 503b of the airflow expansion zone consists of a quarter-circle arc and a straight line segment.

[0040] The length of the airflow contraction zone 501 is 'a', the length of the throat stabilization zone 502 is 'b', the length of the airflow expansion zone 503 is 'c', and the diameter of the throat stabilization zone 502 is 'd', where a:b = (4-6):1, d:b = (1.2-2):1, and c:b = (2-3.5):1. In this embodiment, the length of the airflow contraction zone 501 is 2.6 mm, the length of the throat stabilization zone 502 is 0.5 mm, the diameter of the throat stabilization zone 502 is 0.8 mm, and the length of the airflow expansion zone 503 is 1.6 mm.

[0041] In this embodiment, compressed air enters the intake pipe section 1 from the air source, then undergoes a first acceleration through the transition section 2, and is then divided into three parts by the splitting wall 10. One part enters the main air passage 3, and the other two parts enter the two symmetrical auxiliary air passages 4 respectively. Then, the airflow in the main air passage 3 enters the scaling and acceleration channel 5 for a second acceleration, and finally is ejected through the outlet hole 7. The airflow in the auxiliary air passage 4 converges in the diffuser chamber 6. At this time, due to the change in cross-section, the speed decreases and the pressure increases. Finally, it is ejected from the arc-shaped side outlet hole 8. The airflow ejected through the side outlet hole 8 will form a cone and intersect with the airflow ejected from the middle outlet hole 7 at a certain angle θ. The intersection area is within the core velocity area of ​​the airflow in the outlet hole 7, thus completing the third acceleration and airflow convergence of the airflow. The acceleration process in the scaling acceleration channel 5 is as follows: Compressed air first enters the airflow throat steady flow section 502 through the airflow contraction zone 501. During this process, the Mach number is less than 1 and the flow is subsonic. The cross-sectional area decreases, the pressure decreases, the density decreases, and the airflow speed increases. The Mach number gradually increases and reaches Ma=1 at the throat. After the flow stabilizes, it enters the airflow expansion zone 503. At this time, the cross-sectional area increases, the pressure decreases, the density decreases, and the airflow speed further increases. Then it is ejected from the air outlet hole 7.

[0042] In this embodiment, a through hole 91 communicating with the outside of the diffuser 6 is provided inside the diffuser 6. An inflatable bladder 92 is also attached to the inner wall of the diffuser 6. The inflatable bladder 92 has an air hole (coinciding with the through hole 91) communicating with the through hole 91. A sealing plug 93 is provided at the through hole 91 to seal the air hole (i.e., to seal the through hole 91). By expanding and contracting the inflatable bladder 92, the volume inside the diffuser 6 is changed. Different volumes of the diffuser 6 can change the strength of the airflow ejected from the side outlet 8 to adapt to different inlet total pressures. In addition, by adjusting the volume of the diffuser 6, the flow rate and concentration of the main jet can also be affected by the strength of the airflow ejected from the side outlet 8 to adapt to different application scenarios and improve the versatility of this solution. The position of the through hole 91 in the attached figure is only schematic and can be adjusted as needed.

[0043] In addition, the applicant established a control group using Fluent software to simulate the jet performance of a conventional auxiliary nozzle and the structure of this embodiment under the same total air supply pressure. The conventional auxiliary nozzle has only one outlet hole at the end.

[0044] Under a total pressure of 0.3 MPa, Figure 9 This is a velocity contour map of the external flow field distribution of a conventional auxiliary nozzle. Figure 10 This is a velocity cloud map of the external flow field distribution in the cross-section of this embodiment. Figure 11 This is a velocity cloud map of the external flow field distribution in the longitudinal section of this embodiment. Figure 10 A vertical perspective view). Through Figures 9-11 It can be seen that the maximum velocity in this embodiment reached 468 m / s, which is higher than the 330 m / s of the conventional auxiliary nozzle, and the overall velocity of the external flow field is higher than that of the conventional auxiliary nozzle.

[0045] Figure 12 This is a velocity contour map of the effective weft-guiding airflow region 10mm from the outlet orifice of a conventional auxiliary nozzle. Figure 13 This is a velocity contour map of the effective weft-guiding airflow region 10mm from the outlet hole in this embodiment. Figure 12 and 13 It can be seen that their maximum speed is around 150m / s, but the effective weft insertion area of ​​this embodiment is larger than that of conventional auxiliary nozzles, that is, the weft insertion effect of this embodiment is better.

[0046] Figure 14 This is a graph showing the airflow velocity distribution at the outlet of a conventional auxiliary nozzle as a function of distance. Figure 15 This is a graph showing the airflow velocity distribution at the nozzle exit as a function of distance in this embodiment. Figure 14 and 15 It can be seen that the trends of change in the two graphs are basically the same. Figure 15 The peak speed is higher than Figure 14 , Figure 15At 210 m / s, the velocity begins to decrease slowly. Figure 14 The velocity decreases slowly at 175 m / s, meaning that the average airflow velocity in this embodiment is higher than that of a conventional auxiliary nozzle.

Claims

1. An auxiliary nozzle for an air-jet loom, comprising a tube with an internal air passage, an air hole at the end of the tube communicating with the internal air passage, the tube being an elongated structure, characterized in that: The vent includes a circular vent and two side vents. The circular vent is located on the center line of the pipe body, and the two side vents are symmetrically arranged on both sides of the center line of the pipe body. The side vents and the circular vent are on the same straight line. The airflow extension lines of the side vents are inclined toward the airflow extension line of the circular vent, and the three airflow extension lines intersect at the same intersection point. The air passage includes an air inlet section and a flow stabilization section. The flow stabilization section includes a main air passage and two auxiliary air passages. The air inlet of the main air passage is connected to the air inlet section and the air outlet is connected to the air outlet hole. The air inlet of the auxiliary air passage is connected to the air inlet section and the air outlet is connected to the side air outlet hole. Two auxiliary airways are arranged adjacent to the main airway and symmetrically on both sides of the main airway. A diffuser chamber is provided at the air outlet of each of the two auxiliary airways. The air outlets on both sides are connected to the auxiliary airways through the diffuser chamber. The diffuser chamber gradually expands from the air outlet of the auxiliary airway toward the side air outlet. A scaling and acceleration channel is provided between the air outlet of the main air passage and the air outlet circular hole. The scaling and acceleration channel includes an airflow contraction zone, a throat flow stabilization zone and an airflow expansion zone connected in sequence. The airflow contraction zone is connected to the air outlet of the main air passage and the airflow expansion zone is connected to the air outlet circular hole. Both the airflow contraction zone and the throat flow stabilization zone are straight pipes with a circular longitudinal cross-section. The airflow contraction zone is a constricted structure that gradually narrows along the outlet direction, the throat flow stabilization zone is a straight pipe structure with an equal inner diameter, and the airflow expansion zone is an flared structure that gradually expands along the outlet direction. A transition section is provided between the intake pipe section and the flow stabilization section. This transition section is a constricted structure with a gradually decreasing volume along the airflow direction.

2. The auxiliary nozzle for an air-jet loom according to claim 1, characterized in that: The length of the airflow contraction zone is a, the length of the throat stabilization zone is b, the length of the airflow expansion zone is c, and the diameter of the throat stabilization zone is d. a:b = (4~6):1, d:b = (1.2~2):1, c:b = (2~3.5):

1.

3. The auxiliary nozzle for an air-jet loom according to claim 2, characterized in that: The length of the airflow contraction zone is 2.6 mm, the length of the throat stabilization zone is 0.5 mm, and the diameter of the throat stabilization zone is 0.8 mm.

4. The auxiliary nozzle for an air-jet loom according to claim 1, characterized in that: The inner surface of the inner wall of the airflow expansion zone, which is opposite to the air outlet hole and the throat flow stabilization zone, is a spherical structure, and the center of the spherical structure is located in the direction of the air outlet hole.

5. The auxiliary nozzle for an air-jet loom according to claim 1, characterized in that: The side vent has an arc-shaped opening, with the center of the arc facing the direction of the vent.

6. The auxiliary nozzle for an air-jet loom according to claim 5, characterized in that: The central angle of the arc structure is 50°~70°; The extended lines of the airflow from the two side vents are set at an angle of 15° to 20° to the extended lines of the airflow from the circular vent.

7. The auxiliary nozzle for an air-jet loom according to claim 1, characterized in that: The diffuser chamber has a through hole that communicates with the outside of the diffuser chamber. An air bladder is also attached to the inner wall of the diffuser chamber. The air bladder has an air hole that communicates with the through hole. A sealing plug is provided at the through hole to block the air hole.

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